JP2011125387A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine entirely removing a thread remaining on a cloth after cutting the thread. <P>SOLUTION: The sewing machine includes a needle bar 12 for holding a sewing needle 11, a needle vertically moving mechanism for vertically moving a needle bar, a thread cutting device for cutting a needle thread after forming a stitch, and a remaining thread disposal device 60 for removing the thread cut by the thread cutting device and remaining on the side of a workpiece C from the workpiece. The remaining thread disposal device includes remaining thread disposal knives 66 and 67 for cutting away the remaining thread at a position directly facing the lower surface of the workpiece, and a suction unit 79 for sucking the remaining thread toward the remaining thread disposal knives. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sewing machine that performs a remaining yarn treatment after yarn cutting.

Modern sewing machines are equipped with a thread trimming device on the lower side of the needle plate and automatically cut the lower thread from the hook to the cloth and the upper thread from the sewing needle to the cloth after the needle drop of the final needle is performed. Making it possible.
Such a thread trimming device includes a moving knife that reciprocates so as to pass directly below the needle hole of the needle plate, a fixed knife that cooperates when the moving knife moves backward, and a reciprocating action to the moving knife. In general, a drive source for providing the above is provided (for example, see Patent Document 1).
The moving knife distributes the thread at the time of forward movement so as not to cut excess portions from the upper thread and the lower thread that are suspended from the needle hole, and the upper thread and lower thread that are distributed at the time of backward movement. They were captured and transported to a fixed knife and they were cut.

JP 2009-5996 A

By the way, when the surface that is directed downward during sewing is easily sewn after completion of sewing, the length of the remaining portions of the upper thread and lower thread cut by the thread trimming device is as short as possible. It is desirable to make it inconspicuous.
However, since the conventional cutting device is provided on the lower side of the needle plate, even if the knife is arranged as close as possible to the lower surface of the needle plate, the upper opening from the needle hole to the blade edge of the fixed knife It was inevitable that a yarn remaining for a distance would occur.
Further, in the case of a sewing machine having an X-Y moving mechanism that holds a cloth with a cloth holding frame on the upper side of the needle plate and moves it to an arbitrary needle drop position, the lower surface of the cloth held by the cloth holding frame is further provided. Therefore, there is a problem that the yarn remainder corresponding to the distance from the needle plate to the upper surface of the needle plate is further added, and the yarn remainder becomes more remarkable.
As a countermeasure against these remaining yarns, it is indispensable to perform a cutting operation of the remaining yarns manually, resulting in an inconvenience that an increase in work load and an accompanying increase in sewing costs are caused.

  An object of the present invention is to more effectively remove the remaining end portion after thread trimming.

  The invention described in claim 1 includes a needle bar for holding a sewing needle, a needle up-and-down moving mechanism for moving the needle bar up and down, and a thread trimming device for cutting an upper thread and a lower thread after forming a stitch on the lower side of the needle plate. A remaining thread processing device that removes the remaining thread after being cut on the sewing product side by the thread trimming device from the sewing product, and the remaining thread processing device directly attaches the remaining thread to the lower surface of the sewing product. It is characterized by comprising a remaining yarn processing knife that cuts off at an opposing position, and suction means for sucking the remaining yarn toward the remaining yarn processing knife.

  The invention according to claim 2 has the same configuration as that of the invention according to claim 1, and the remaining thread processing knife is formed on the upper surface of the placing portion positioned below the sewing product at the time of sewing. Provided with a knife raising and lowering means for holding the remaining yarn treatment knife and moving the remaining yarn treatment knife from below toward the position directly opposed to the bottom surface of the sewing product. To do.

  The invention described in claim 3 has the same configuration as that of the invention described in claim 2, and the knife lifting means makes the remaining thread processing knife contact the sewing product via a spring. Features.

  The invention according to claim 4 is provided with the same configuration as that of the invention according to any one of claims 1 to 3, and further includes adjusting means for adjusting the inclination angle of the blade surface of the remaining thread treatment knife. To do.

  The invention according to claim 5 has the same configuration as that of the invention according to any one of claims 1 to 4, a holding frame for holding the sewing product, and the sewing material through the holding frame. A moving mechanism that arbitrarily moves an object along a plane, and a sewing control unit that performs needle drop at an arbitrary position of a sewing object that is predetermined by operation control of the moving mechanism, and the sewing control unit includes: After the formation of the seam, the needle drop position of the final needle is positioned at the attachment position of the remaining thread treatment knife.

  The invention according to claim 6 has the same configuration as that of the invention according to any one of claims 1 to 5, and holds the upper thread end portion remaining on the sewing needle side by cutting of the thread trimming device. A clamp mechanism; and an upper thread processing device that cuts the upper thread end held by the clamp mechanism at a needle drop position of the first stitch of the sewing product, the upper thread processing device including the upper thread end An upper thread processing knife for cutting the upper thread processing knife from the sewing product, and a knife driving means for holding the upper thread processing knife and lowering the upper thread processing knife to a position directly facing the upper surface of the sewing object. Features.

Since the invention according to claim 1 is provided with a remaining thread processing device that cuts the remaining thread at a position that directly faces the lower surface of the sewing product, the remaining thread processing knife is interposed between the remaining thread processing knife and the sewing product. The remaining thread can be cut with the remaining thread treatment knife sufficiently close to the sewing product in the state where there is no intervening material such as a needle plate, and the upper and lower threads remaining on the sewing product after cutting. The remaining length can be shortened more effectively.
In addition, since the present invention has a suction means for sucking the residual yarn, even if the residual yarn before cutting is tilted, it can be pulled up and pulled toward the residual yarn processing knife by suction, so that the residual yarn is better. Yarn processing can be performed.
Further, it is possible to prevent lint from adhering to the sewing object by continuing the suction after the excision. As a result, it is not necessary to remove the adhered yarn waste, and the work burden can be reduced. In addition, since the suction method is used, dust generated at the time of thread cutting is also removed, and it becomes possible to prevent the sewing machine and the sewing product from becoming dirty.
For this reason, it is possible to eliminate the remaining thread processing work after sewing, and it is possible to significantly reduce the work load and the sewing cost.
Note that the remaining thread treatment knife may be arranged in contact with the workpiece, but is more preferably in a close proximity state as much as possible.
The remaining thread processing knife may be a passive one in which the remaining thread hits the blade edge by the movement of the sewing product, or an active one in which the knife performs a cutting operation, for example, two that constitute the knife. A pinch type or clipper type in which cutting is performed with a cutting edge may be used. Moreover, not only what cut | disconnects with a sharp blade edge but you may utilize the heating-type knife which excises with a heat | fever.

  According to the second aspect of the present invention, a remaining thread processing knife is disposed in the opening with respect to the sewing object positioned on the upper surface of the placing portion, the remaining thread processing knife is held, and the remaining thread processing knife is attached to the sewing object. Since the knife raising / lowering means for raising the lower surface from the lower side to the position directly opposite is provided, the remaining yarn processing knife can be arranged to be raised and lowered within the range of the upper surface of the placing portion. As a result, the remaining thread processing knife can be retracted downward when not cutting, and the remaining thread processing knife can be raised directly below the sewing product when cutting. Compared to the above, it becomes possible to protect the sewing product from the remaining thread treatment knife.

  According to the third aspect of the present invention, the remaining thread processing knife is brought into contact with the sewing product via the spring pressure, so that the remaining thread processing knife is directly brought into contact with the sewing object using an actuator or the like. Therefore, it is possible to avoid the remaining yarn cutting operation with an excessive contact pressure, and it is possible to avoid a failure such as damaging the workpiece.

  In the invention according to claim 4, in order to make it possible to adjust the inclination angle of the blade surface of the remaining thread treatment knife, the parallelism between the lower surface of the sewing product and the blade surface of the remaining thread treatment knife is increased and the state is closer to each other. Thus, the remaining yarn can be excised and the remaining yarn can be processed in a shorter time.

  In the invention according to claim 5, it is necessary to move the needle drop position of the final needle of the sewing product to the remaining thread processing knife for cutting the remaining thread, but the role of the needle drop is performed at an arbitrary position. This means that it is possible to improve productivity by reducing the number of parts and simplifying the device. Become.

According to the sixth aspect of the present invention, since the clamp mechanism is provided, it is possible to prevent the formation of a bird's nest under the workpiece, and the upper thread end held by the clamp mechanism is sewn. Since the upper thread processing device for cutting at the needle drop position of the first stitch of the article is provided, it is possible to cut the upper thread end that remains out of the sewing product by the clamp mechanism.
Furthermore, since the upper thread processing device can directly oppose the upper thread processing knife to the upper surface of the sewing product by the knife driving means, the upper thread end is positioned with the thread processing knife closest to the sewing object. The remaining length of the upper thread end portion remaining on the sewing product after the cutting can be shortened more effectively. Note that the knife may be brought into contact with the workpiece or may be brought close to each other.
The upper thread treatment knife may be cut by applying an upper thread to the cutting edge, or may be a pinching type in which cutting is performed with two cutting edges constituting the knife.

It is a front view showing the whole sewing machine which is an embodiment of the invention. FIG. 2A is a perspective view of a curtain that is a sewing object of the sewing machine, and FIG. 2B is an enlarged perspective view of a fold portion of the curtain that is sewn by the sewing machine. 3A is a plan view of the lower plate, FIG. 3B is a plan view of the first and second cloth holding frames, and FIG. 3C is a fold portion held by the cloth holding frame and the lower plate. It is sectional drawing in the position of the WW line of FIG. 3 (B) in a state. It is a front view of a clamp mechanism and an upper thread processing apparatus. It is a rear view of a clamp mechanism and an upper thread processing apparatus. It is a perspective view of the periphery of a clamp member. It is the figure which looked at the circumference of a clamp member with a horizontal line of sight. FIG. 8A is a plan view showing the arrangement of the upper thread processing knife and the tip of the clamp member, and FIG. 8B is an enlarged perspective view of the tip of the upper thread processing knife. It is a front view of a remaining yarn processing apparatus. It is a rear view of a remaining yarn processing apparatus. It is a top view of a remaining yarn processing apparatus. It is a bottom view of a remaining yarn processing apparatus. It is a perspective view of a needle plate periphery for showing arrangement of a remaining thread processing knife. It is explanatory drawing which shows angle adjustment of the periphery of the Y-axis of a remaining thread process knife. It is explanatory drawing which shows angle adjustment of the surroundings of the X-axis of a remaining thread process knife. It is a block diagram which shows the control system of a sewing machine. It is a flowchart which shows sewing operation | movement of a sewing machine. It is operation | movement explanatory drawing of an upper thread processing apparatus and a clamp apparatus, Comprising: Operation | movement advances in order of FIG. 18 (A)-(G). It is operation | movement explanatory drawing of a remaining yarn processing apparatus, Comprising: Operation | movement advances in order of FIG. 19 (A)-(C). It is a perspective view which shows the example of the other sewing machine which replaces with a cloth holding frame and is provided with a pressing spring. It is operation | movement explanatory drawing which shows the other example of an upper thread processing apparatus, and operation | movement advances in order of FIG. 21 (A)-(C). It is a front view which shows the example which provided the knife height adjustment means in the upper thread processing apparatus. It is a front view which shows the example which provided the knife height adjustment means in the remaining yarn processing apparatus.

(Overall configuration of the embodiment of the invention)
An embodiment of the sewing machine 10 according to the present invention will be described.
1 is a front view showing the entire sewing machine 10, FIG. 2A is a perspective view of a curtain that is a sewing object of the sewing machine 10, and FIG. 2B is an enlarged view of a fold portion H of the curtain that the sewing machine 10 performs sewing. It is a perspective view.
The sewing machine 10 is a so-called electronic cycle stitching sewing machine that enables needle dropping in order at an arbitrary position on a horizontal plane, and particularly has a configuration suitable for sewing the fold portion H of the curtain C. It functions as a crease remover.
In the following description, the horizontal predetermined direction is described as the X-axis direction (left-right direction in FIG. 1), the horizontal direction orthogonal to the X-axis direction is defined as the Y-axis direction, and the vertical vertical direction is described as the Z-axis direction. Shall be performed.

(curtain)
As shown in FIG. 2, the curtain that is the sewing product has a plurality of folds H formed at uniform intervals along the upper edge. The crease H is a stack of six sheets with the upper end of the curtain fabric C folded in the vertical direction (strictly speaking, the curtain C is folded in advance at its upper edge to form a bag portion for accommodating the core fabric. The first seam L1 that is folded in a bellows shape and bundled so that the six-layered parts are not separated, and the second seam L2 that is sewn so that the six-layered parts are squeezed at the base Is given. The second seam L2 is formed with a length extending from the upper end of the curtain C to the full width of the bag portion described above, and the first seam L1 has a minimum number of stitches for suppressing the swelling of the six-layered portion. Is formed.
The sewing machine 10 stores sewing data created in advance to form the stitch patterns of the first and second stitches L1 and L2, and can automatically perform sewing according to the sewing data.

(Schematic configuration of the sewing machine)
The sewing machine 10 mainly includes a needle up-and-down moving mechanism (not shown) that moves the needle bar 12 that holds the sewing needle 11 up and down, a needle plate 13 in which a needle hole for needle dropping is formed, a needle plate 13, The integrally formed throat plate auxiliary plate 14, a hook mechanism (not shown) that catches the upper thread from the sewing needle 11 at the needle drop position and entangles the lower thread, and the main configuration of the sewing machine 10 are built in or outside. A sewing machine frame 20 to be held, a thread trimming device (not shown) for cutting the upper thread U after forming the stitches, a clamp mechanism 30 for retaining the upper thread end U1 remaining on the sewing needle side by the cutting of the thread trimming device, An upper thread processing device 40 that cuts the upper thread end U1 held by the clamp mechanism 30 at the needle drop positions of the first stitches of the stitches L1 and L2, and the remaining thread after cutting on the fabric side by the thread trimming device. A residual yarn processing device 60 to be removed from C, and X A cloth movement mechanism 80 as a moving mechanism for moving and positioning the arbitrary position of the Y plane is constituted by a control unit 90 as a sewing control unit for controlling the operation of each of the above structures.
Further, since a thread tension device that adjusts the needle thread tension provided in general sewing machines, a balance mechanism that lifts the needle thread, and the like are well known, detailed description thereof will be omitted.

(Sewing frame)
The sewing machine frame 20 includes a bed portion 21 extending along the Y-axis direction, a vertical trunk portion 22 erected from one end portion of the bed portion 21, and the same direction as the bed portion 21 from the upper end portion of the vertical trunk portion 22. The arm portion 23 is configured to extend.
The needle plate 13 is attached so that the upper surface thereof is horizontal in the upper part on the tip side of the bed part 21. The needle plate auxiliary plate 14 is integrally connected to the needle plate 13 so that the upper surface thereof is flush with the upper surface of the needle plate 13. That is, the upper surface of the throat plate auxiliary plate 14 is also horizontal, and the lower plate 83 of the cloth holding frames 81 and 82 for holding the fabric C described later is in sliding contact with the upper surfaces of the throat plate 13 and the throat plate auxiliary plate 14. It is arbitrarily positioned and sewn.
That is, the needle plate 13 and the needle plate auxiliary plate 14 function as “a placement portion positioned below the sewing product at the time of sewing”.

(Needle up / down mechanism and shuttle mechanism)
The needle up-and-down movement mechanism is applied to the needle bar 12 by converting the sewing machine motor 15 (see FIG. 16) serving as a drive source, the upper shaft that is rotationally driven by the sewing motor 15 and the rotational power of the upper shaft into vertical movement. It is mainly composed of a crank mechanism.
Further, the sewing needle 11 is provided with an intermediate presser 17. The intermediate presser 17 causes the fabric C to be pulled upward by the sewing needle 11 when the sewing needle 11 drops onto the fabric C held by the fabric holding frames 81 and 82, causing the fabric to flutter. It is provided to prevent this. That is, the intermediate presser 17 has a cylindrical portion in which the sewing needle 11 is loosely inserted, and moves up and down with a smaller stroke at a lower position than the sewing needle 11 in synchronization with the sewing needle 11, thereby I'm suppressing the date.

  The hook mechanism includes a lower shaft to which a double speed rotation operation is transmitted from the upper shaft via a timing belt disposed in the vertical body, an outer hook to which rotation about the Y axis is given by the lower shaft, It consists of an inner hook that holds the bobbin inside the hook. The outer hook captures the upper thread from the sewing needle 11 with the sword tip, and has a function of entwining the lower thread D fed out from the bobbin with the upper thread U by pulling out in a loop by rotation and passing through the inner hook. When the upper thread U is pulled up, the upper thread is tightly bound to form a seam.

(Thread trimming device)
The thread trimming device includes a moving knife that reciprocates along a horizontal plane so as to pass the vertical movement path of the sewing needle 11 in the orthogonal direction directly below the needle hole of the needle plate 13, and a cutting edge on the standby position side of the moving knife. Are fixedly supported toward the moving knife side, and a thread trimming solenoid 16 (see FIG. 16) that gives the moving knife a reciprocating rotation through a transmission mechanism.
The thread trimming device performs thread trimming when the last sewing needle is raised and is at the upper stop position (before the balance pulls up the upper thread). At this timing, the hook is in a state where the upper thread is captured by the sword tip and a loop is formed. In the vicinity of the needle hole, one lower thread D extending from the hook to the cloth and the sewing needle reach the hook and the hook to the cloth. There are two upper threads U. In this state, the moving knife starts reciprocating rotation, selects only the upper thread U on the sewing needle side in the forward path, and thins only the upper thread U and lower thread D on the fabric side to carry to the fixed knife. Cutting is performed by sandwiching them with a knife.

(Cloth movement mechanism)
The cloth moving mechanism 80 includes first and second cloth holding frames 81 and 82 for holding the cloth C from above, a lower plate 83 for placing the cloth C, and first and second cloth holding frames 81 and 82. And a cloth feed base 84 that holds the lower plate 83, an X-axis motor 85 (see FIG. 16) that moves the fabric C to an arbitrary position in the X-axis direction via the cloth feed base 84, and a cloth feed base 84. And a Y-axis motor 86 (see FIG. 16) for moving the dough to an arbitrary position in the Y-axis direction.

3A is a plan view of the lower plate 83, FIG. 3B is a plan view of the first and second cloth holding frames 81 and 82, and FIG. 3C is a cloth holding frame 81 and 82 and the lower plate. FIG. 8 is a cross-sectional view taken along the line WW in FIG. 3B in a state where a fold portion H is held at 83.
The lower plate 83 is fixedly installed below the cloth feed base 84. The lower plate 83 is made of a single rectangular flat plate and has a structure specialized for sewing the fold portion H of the curtain. That is, the lower plate 83 is formed with a concave portion 83a whose upper surface is depressed and an opening portion that is vertically cut through.
The concave portion 83a is formed in a substantially rectangular shape that is long along the X-axis direction, and the fold portion H is placed on the lower plate 83 so that the six-layered portion is in the concave portion 83a. The presence of the concave portion 83a prevents the seam from being inclined with respect to the thickness direction of the crease H after the formation of the second seam L2, and the crease H can be balanced left and right. It can be formed into a shape.
The opening is composed of a portion 83b cut out in a slit shape along the X-axis direction and a portion 83c cut out in a rectangular shape somewhat wider along the Y-axis direction from the intermediate position. The rectangular portion 83c is for forming the second seam L2, and the rectangular portion 83c is for forming the first seam L1.
Note that the slit portion 83b is formed to be somewhat longer and the rectangular portion 83c is formed to be somewhat wider so that it can be used to sew various fold portions having different actual sizes.
In the case of the remaining yarn processing, which will be described later, the remaining yarn processing knife 66, 67 abuts the lower surface of the fabric C from below to cut out the remaining yarn. Since the lower plate 83 is not obstructed, each knife 66, 67 can be brought into close contact with the fabric C, and the remaining yarn can be cut shorter.

The first and second cloth holding frames 81 and 82 are overlapped with the lower plate 83 from above so as to sandwich the fabric C between the upper and lower sides.
The cloth holding frames 81 and 82 are individually supported by the cloth feed base 84 so as to be movable up and down individually, and the vertical movement is performed by a press-up air cylinder prepared individually.
The first cloth holding frame 81 is formed with a notch 81a penetrating vertically with substantially the same size at a position corresponding to the rectangular portion 83c of the opening of the lower plate 83, and around the first seam L1. Avoiding this, it is possible to press and hold the six overlapping portions of the fold portion H from above.
The second cloth holding frame 82 includes a bypass part 82a that bypasses the first cloth holding frame 81, and a pressing part 82b that extends straight from the tip of the bypass part 82a along the X-axis direction. The A slit-like space is set between the first cloth holding frame 81 and the pressing portion 82b, and a second seam L2 is formed in the space.
The reason why the cloth holding frame is divided into two in this way is that the fold portion H is thick on one side across the second seam K2, and is thin on the opposite side. That is, the cloth holding frame that is integrally formed cannot sufficiently obtain the holding pressure of the thin portion. That is, by dividing the cloth holding frame in this way, the fabric C is appropriately held, the seam is appropriately formed, and the sewing quality is improved.

  The cloth feed base 84 is supported by the bed portion 21 so as to be freely movable in the X-axis direction and the Y-axis direction, and the X-axis motor 85 and the Y-axis motor 86 are used as driving sources to drive the cloth feed base 84 via an operation transmission mechanism (not shown). It can be moved to any position on the -Y plane. Thereby, the needle drop to the arbitrary positions of the cloth C is realized through the cloth holding frames 81 and 82.

(Clamp mechanism)
4 is a front view of the clamp mechanism 30 and the upper thread processing device 40, and FIG. 5 is a rear view.
The clamp mechanism 30 is supported by a base frame 41 of the upper thread processing device 40, and the base frame 41 is fixedly mounted on the side surface of the distal end portion of the arm portion 23.
The clamp mechanism 30 slidably contacts the lower surface of the clamp member 31 and the clamp member 31 that captures the upper thread end U1 that has been cut from the sewing needle 11 above the needle plate 13 in the needle vertical movement path. A clamping plate 32 that clamps the upper thread end U1 together with the clamp member 31, a clamping air cylinder 33 that provides a back-and-forth movement of the clamping member 31, a lower block 34 that holds these, and a lower block 34, an upper block 35 that is linked to the upper block 35, an elevating air cylinder 36 that applies an elevating operation to the upper block 35, a rail-like slide member 37 that connects the lower block 34 and the upper block 35, and the back surface of the base frame 41. And a slide guide 38 which is fixedly mounted on the side and holds the slide member 37 so as to be movable up and down.

FIG. 6 is a perspective view of the periphery of the clamp member 31, and FIG. 7 is a view of the periphery of the clamp member 31 as seen from a horizontal line of sight.
The clamp member 31 has a long plate shape as a whole, and a flat plate surface thereof is generally horizontal. And the front-end | tip part of the clamp member 31 is formed in bowl shape, and the rear-end part is connected with the plunger 33a of the air cylinder 33 for clamps. The distal end portion of the clamp member 31 is directed to the vertical movement path of the sewing needle 11, and the clamp member 31 crosses the vertical movement path of the sewing needle to advance and retract by driving the clamping air cylinder 33. It has become. As a result, the clamp member 31 can catch the upper thread end portion U1 hanging down from the sewing needle 11 retracted upward by the tip hook-shaped portion when the retreating movement is performed.

  As shown in FIG. 7, the holding plate 32 has a groove formed on the upper surface thereof along the forward / backward movement direction of the clamp member 31, and stores the clamp member 31 inside the groove. On the other hand, the distal end portion of the clamp member 31 is formed to be curved downward to some extent, and the upper surface of the groove portion of the clamping plate 32 is in sliding contact with the lower surface of the distal end portion of the clamp member 31. Thus, the upper thread end portion U1 that the tip hook-shaped portion of the clamp member 31 has gathered during the backward movement can be clamped by the clamp member 31 and the clamping plate 32.

  The lower block 34 holds the clamping plate 32 and the clamping air cylinder 33 and is supported by the base frame 41 via a slide member 37 and a slide guide 38 so as to be movable up and down. The lower limit position is adjusted so that the clamp member 31 can enter between the lower end portion of the sewing needle 11 at the upper stop position and the needle plate 13.

The elevating air cylinder 36 is fixedly mounted on the base frame 41 so that the plunger 36a is directed upward and the operation direction thereof is along the Z-axis direction.
The upper block 35 is connected to the plunger 36a of the lifting air cylinder 36 via an adjustment screw 35a. The lifting / lowering air cylinder 36 applies tension to the upper thread end U1 from the fabric C to the clamp member 31 by pushing up the clamp member 31 when the upper thread end U1 is clamped, and performs subsequent cutting work. It is for performing suitably. Therefore, the upper limit position of the clamp member 31 by the elevating air cylinder 36 is an important factor for determining the tension applied to the upper thread end portion U1, and if the upper limit position of the clamp member 31 is too high, the upper thread end portion U1 is If it is too low from the clamp member 31 and is too low, the upper thread end U1 is loosened and cannot be cut off. Accordingly, the upper and lower positions of the upper block 35 relative to the plunger 36a of the lifting air cylinder 36 can be adjusted by the adjusting screw 35a, and the upper limit position of the clamp member 31 can be adjusted.
As described above, the upper and lower blocks 34, 35, the lifting air cylinder 36, the slide member 37, and the slide guide 38 function as "clamp movable means".

Further, the upper block 35 is adjacent to the clamp member 31 and holds a suction nozzle 39 as a collecting means for collecting the upper thread end portion U1 after cutting. The suction nozzle 39 is disposed such that the tip end for suction is directed toward the clamp member 31 in the vicinity of the tip end of the clamp member 31 in the retracted position. When the clamp member 31 moves forward in order to clamp the next upper thread end portion after the excision, the clamp state is released and the suction nozzle 39 is sucked.
The suction nozzle 39 has a rear end connected to an ejector (not shown) via a tube, and performs suction by a negative pressure generated from the ejector. Further, a collection net is attached to the exhaust port of the ejector, and all the upper thread ends after excision are collected in the collection net.

(Upper thread processing device)
The upper thread processing device 40 is connected to the base frame 41 described above, a rail-like slide member 42 supported so as to be movable up and down with respect to the base frame 41 via a slide guide (not shown), and a lower end portion of the slide member 42. The knife holding body 43 that can be moved up and down, the upper thread processing knife 44 held by the knife holding body 43, the pressing spring 45 that presses the knife holding body 43 downward, and the knife holding against the pressing spring 45 A knife driving air cylinder 46 as a knife driving means for raising the body 43 is provided.

  The knife holding body 43 is supported by the base frame 41 through the slide member 42 so as to be able to move up and down obliquely. That is, the slide member 42 is provided so as to be inclined so as to approach the sewing needle 11 side as the knife holding body 43 is lowered.

8A is a plan view showing the arrangement of the upper thread processing knife 44 and the tip of the clamp member 31, and FIG. 8B is an enlarged perspective view of the tip of the upper thread processing knife 44. FIG.
The upper thread processing knife 44 extends downward at the same inclination angle as the slide member 42 at the end of the knife holder 43 near the sewing needle 11. A lower end portion of the upper thread processing knife 44 is bent so as to be horizontal, and a cutting edge 44a for cutting is formed at an edge portion of the horizontal portion. The upper thread processing knife 44 is disposed with its cutting edge 44a facing the sewing needle 11 side.
Therefore, in a state where the upper thread processing knife 44 is lowered until it comes into contact with the fabric C, by performing sewing toward the upper thread processing knife 44, the upper thread end U1 comes into contact with the blade edge 44a, and the contact pressure is applied. Cutting is done.
In this way, when the upper thread end portion U1 is cut using the feeding operation of the fabric C at the time of sewing formation, the sewing needle 11 and the sewing needle 11 are within a range that does not interfere with other surrounding components. It is desirable that the distance K between the upper thread processing knife 44 and the cutting edge 44a when descending is as close as possible.

Further, as shown in FIG. 8A, the descending position of the upper thread processing knife 44 is set so as to be aligned on the same line along the X-axis direction with respect to the sewing needle 11. Accordingly, when the sewing is performed along the X-axis direction and the fabric C is fed toward the upper thread processing knife 44, the clamp member is moved from the needle drop position of the first stitch in the course of sewing. The upper thread end U1 over 31 can be brought into contact with the cutting edge 44a of the upper thread treatment knife 44, and it is necessary to separately control the upper thread end U1 to move to the lowered position of the upper thread treatment knife 44. Further, as shown in FIG. 8A, the upper thread processing knife 44 and the clamp member 31 are arranged in substantially the same direction with respect to the sewing needle 11, but the upper thread processing knife 44 and the clamp member 31 are both configured to move up and down, so that there is no interference between the clamped upper thread end U1 and the upper thread processing knife 44 from the sewing needle 11. Each direction is slightly shifted It is.

The knife holding body 43 is always urged downward by a pressing spring 45. On the other hand, the knife drive air cylinder 46 is connected so that the plunger 46 a can only apply the raising operation to the knife holder 43. In other words, the plunger 46a of the knife drive air cylinder 46 is loosely inserted into the coupling hole 43a provided in the knife holder 43, and the stopper 46b provided at the tip of the plunger 46a is formed larger than the coupling hole 43a. Has been. Thereby, even if the plunger 46 a of the knife driving air cylinder 46 moves downward, the knife holding body 43 is not moved downward from the plunger 46 a and is moved downward according to the pressing spring 45. On the other hand, when the plunger 46a of the knife drive air cylinder 46 is pulled upward, the stopper 46b is caught in the connecting hole 43a, and the knife holder 43 can be pulled upward.
With such a structure, when the upper thread processing knife 44 is lowered, the blade edge 44a comes into contact with the fabric C with the pressing force of the pressing spring 45, and the knife driving air cylinder 46 directly applies the pressing force downward. Compared to the above, it is possible to avoid excessively pressing the upper thread processing knife 44 against the fabric C, and it is possible to make the knife 44 contact in a flexible manner corresponding to the difference in thickness of various fabrics C.

(Remaining yarn processing device)
9 is a front view of the remaining yarn processing device 60, FIG. 10 is a rear view, FIG. 11 is a plan view, FIG. 12 is a bottom view, and FIG. 13 is a view of the vicinity of the needle plate 13 for showing the arrangement of the remaining yarn processing knife. It is a perspective view.
The remaining yarn processing device 60 is supported by a first frame 61 fixedly mounted on the lower surface of the throat plate auxiliary plate 14 by screws, and is movable up and down with respect to the first frame 61 via a slide guide 61a. A second frame body 62, a third frame body 63 held by screwing to the second frame body 62, a fourth frame body 64 held by screwing to the third frame body 63, A bottom plate 65 fixed to the bottom of the fourth frame body 64, and first and second scalpels 66 constituting a residual yarn processing knife supported on the upper surface of the fourth frame body 64 so as to be rotatable about the Z axis, 67, a support shaft 68 of the first knife 66, a support shaft 69 of the second knife 67, interlocking gears 70 and 71 provided on the respective support shafts 68 and 69 and interlockingly rotating in the opposite directions, and a second knife. 67 is fixed to the lower end of the support shaft 69, and is supported by the input arm 72 to which the rotation operation is input and the bottom plate 65. In addition, an excision air cylinder 73 for inputting a rotational motion to the input arm 72, and a scissor lifting / lowering means as a scalpel lifting / lowering means fixed to the first frame 61 and serving as a driving source for the lifting / lowering motion of the scalpels 66 and 67. An air cylinder 74, a transmission spring 75 for transmitting the vertical movement of the plunger 74a of the knife lifting air cylinder 74 to the second frame 62, and a transmission spring connected to the plunger 74a of the knife lifting air cylinder 74 by the connecting plate 76. A suction nozzle 79 disposed in the vicinity of each of the scalpels 66 and 67 in a state in which a support 77 of 75, a spring receiver 78 provided on the second frame body 62 side, and a tip portion for suction face upward. And.

The first and second scalpels 66 and 67 are so-called scissors-type scalpels that slidably contact each other with their blade edges facing each other, and the second scalpel 67 is arranged above the first scalpel 66. It is installed.
Each of the support shafts 68 and 69 can be simultaneously rotated at the same rotation angle in the opposite directions by the meshing of transmission gears fixedly mounted on each of the support shafts 68 and 69. And thereby, each knife 66,67 fixed to the upper end part of each spindle 68,69 rotates so that a mutual blade edge may be opened and closed, and excision of a remaining thread is enabled.
Further, the support shaft 68 of the first knife 66 is equipped with a pressing spring 68a that presses the knife 66 upward, whereby the first knife 66 can be brought into close contact with the second knife 67, and the cutting can be further performed. It is possible to do it reliably.

  The support shaft 69 of the second knife 67 passes through the bottom plate 65 and protrudes downward, and the input arm 72 is fixed to the lower end portion of the second knife 67 by hugging. A plunger 73a of an excision air cylinder 73 is connected to the rotating end of the input arm 72, and is driven by the scalpels 67, 68 via the support shafts 68, 69 by driving the excision air cylinder 73. An excision operation is performed.

The knife lifting air cylinder 74 is fixedly mounted on the first frame 61 with the plunger 74a facing downward. The plunger 74a is fixedly equipped with a connecting plate 76, and an upper column 77 is fixedly supported on the upper surface of the connecting plate 76. The coil-shaped transmission spring 75 is interposed between the connecting plate 76 and the spring receiver 78 in a state where the support pillar 77 is inserted, and the spring receiver 78 has a through hole into which the support pillar 77 is inserted. As a result, when the plunger 74a is moved upward by driving the knife lifting air cylinder 74, the support column 77 is also moved upward together with the plunger 74a by the connecting plate 76. However, the upward movement operation is directly performed from the support column 77 to the spring receiver 78. Is not transmitted, but is transmitted via the transmission spring 75.
When the knife lift air cylinder 74 is lifted, each knife 66 and 67 comes into contact with the lower surface of the fabric C held by the cloth holding frames 81 and 82, but the lifting action is transmitted via the transmission spring 75. Therefore, it is possible to suppress contact with an excessive pressing force.

Further, since each knife 66, 67 rises by driving the knife lifting air cylinder 74 as described above and abuts against the lower surface of the fabric C to cut the remaining yarn, the needle plate auxiliary plate 14 is moved up and down. A penetrating opening 14a is formed, and can appear and disappear from the opening 14a.
Further, as shown in FIG. 13, the opening 14a and the scalpels 66 and 67 are arranged along the X-axis direction with respect to the sewing needle 11, but they may be arranged in other directions.
However, since the cutting of the remaining thread is performed after the needle drop and thread trimming of the final needle of the sewing are performed, the distance from the sewing needle 11 to the opening 14a and each of the scalpels 66 and 67 is the cutting time. From the viewpoint of speeding up, it is better that the distance is as close as possible to avoid interference with other configurations.

As shown in FIG. 14, the third frame 63 is screwed through two long holes 62 a and 62 a that are formed in the second frame 62 and are aligned vertically. ing. As a result, by loosening the screw, it is possible to adjust the inclination angle of the second frame 62 by rotating the third frame 63 around the Y axis.
Further, as shown in FIG. 15, the fourth frame body 64 is screwed through two elongated holes 63 a and 63 a that are formed in the third frame body 63 and are arranged in the vertical direction along the Y-axis direction. ing. As a result, by loosening the screw, it is possible to adjust the inclination angle of the third frame 63 by rotating the fourth frame 64 around the X axis.
With these structures, each of the knives 66 and 67 can adjust the angle of rotation about the X axis and the Y axis. Thereby, when the inclined surface 67a is provided at the cutting edge of the knife 67 for processing the remaining yarn, the cutting position of the knife 66, 67 is obtained by performing the angle contact so that the inclined surface 67 becomes more horizontal. Can be made closer to the fabric C side than the thickness of the knife, and the remaining yarn after the remaining yarn can be removed can be made shorter (for example, the example of FIG. 14).
In addition, when the remaining thread is removed when sewing is performed on a portion where the fabric C is inclined due to the thickness of the fold portion H like the second stitch L2 of the fold portion H of the curtain, the fabric C By inclining each knife 66, 67 so as to match the inclination angle generated in, the upper surface of the knife 66, 67 can be brought into closer contact with the fabric C, and the remaining yarn after the remaining yarn can be shortened can be made shorter. (For example, the example of FIG. 15).

In addition, the fourth frame body 64 draws the remaining yarn before excision and sucks the remaining yarn after excision in a state where the nozzle tip portion is directed upward so as to face and oppose the lower surfaces of the scalpels 66 and 67. A suction nozzle 79 as a suction means is held. The suction nozzle 79 is provided so that the tip portion for suction faces upward with the scalpels 66 and 67 open, so that the remaining yarn before cutting is along the lower surface of the fabric C. Even when sleeping, it can be lifted down by aspiration, and excision can be performed more reliably.
Similarly to the suction nozzle 39 described above, the suction nozzle 79 is connected to an ejector (not shown) via a tube, and the remaining yarn after excision in a collection net provided at the exhaust port of the ejector. Can be collected.

(Sewing machine control system)
FIG. 16 is a block diagram showing a control system of the sewing machine 10.
The sewing machine 10 includes the control device 90 described above. The control device 90 includes a sewing machine motor 15 and an encoder 15a thereof, an X-axis motor 85 and a Y-axis motor 86 for moving the cloth, and raising and lowering of the cloth holding frames 81 and 82. An electromagnetic valve 87 for controlling the press-up air cylinder, an electromagnetic valve 33b for controlling the clamp air cylinder 33 for moving the clamp member 31 back and forth, and an electromagnetic for controlling the lift air cylinder 36 for lifting and lowering the clamp member 31 A valve 36b, an electromagnetic valve 46c for controlling a knife driving air cylinder 46 for raising and lowering the upper thread processing knife 44, an electromagnetic valve 73b for controlling a cutting air cylinder 73 for cutting the remaining thread processing knife 66, 67, and a remaining thread ON / OFF for suction of the suction nozzle 39 and the electromagnetic valve 74b for controlling the knife cylinder air cylinder 74 for raising and lowering the treatment knife 66, 67 Solenoid valve 39a for switching the F, are solenoid valves 79a is connected to switch the ONOFF suction of the suction nozzle 79, thereby enabling to carry out these operations control.
The control device 90 includes drivers and interfaces for the various actuators described above, and also stores sewing data in which various settings for performing the sewing control are recorded and programs for executing the various controls. An arithmetic processing unit for executing the program is incorporated.
The control device 90 is also provided with an operation panel 91 for inputting various settings, sewing start instructions, and the like, and a display panel 92 for performing various setting data and notification.

  Here, the sewing data of the control device 90 will be described. The sewing data is data in which execution commands for various operations including setting data necessary for performing a series of sewing operations are stored in the order of execution. Specifically, the sewing data stores the movement amount data of X and Y indicating the needle drop position of each needle and the execution or stop command of each actuator described above. These are read in order and executed sequentially at a predetermined timing for each command. The execution timing is obtained when the upper shaft angle is obtained from the encoder 15a provided in the sewing machine motor 15 and the upper shaft angle determined for each command is reached.

(Sewing machine operation control)
Next, the operation control actually performed by the control device 90 of the sewing machine 10 at the time of sewing will be described with reference to FIGS. FIG. 17 is a flowchart of the operation control, FIG. 18 is an operation explanatory diagram of the upper thread processing device 40 and the clamp device 30, and FIG. 19 is an operation explanatory diagram of the remaining yarn processing device 60.
First, as a premise for starting the sewing operation, the cloth holding frames 81 and 82 are raised, the clamp member 31 is in a lowered state, and the upper thread end portion U1 clamped at the time of thread cutting in the previous sewing is kept as it is. Assume that it is in a clamped state. 18 and 19, illustration of the cloth holding frames 81 and 82 and the lower plate 83 is omitted.

When the cloth C is set on the upper surface of the lower plate 83 and the start of sewing is input from the operation panel 91, the control device 90 controls the air cylinder that is pushed up by the electromagnetic valve 87 to lower the cloth holding frames 81 and 82. The dough is held (step S1).
Then, the control device 90 starts sewing (step S2). That is, the driving of the sewing machine motor 15 is started, the sewing data is read, and the X-axis motor 85 and the Y-axis motor 86 are driven so as to reach the set needle drop position of the first stitch.

  When the movement of the needle advances and the needle drop position of the first stitch of the fabric C reaches the number of stitches just before reaching the lowered position of the upper thread processing knife 44 (step S3: FIG. 18A), the control device 90 controls the knife driving air cylinder 46 by the electromagnetic valve 46c to lower the upper thread processing knife 44 and bring it into contact with the upper surface of the fabric C (step S4: FIG. 18B). Almost at the same time, the control device 90 controls the lifting / lowering air cylinder 36 by the electromagnetic valve 36b to raise the clamp member 31 so that the upper thread end portion U1 is clamped (step S5). : FIG. 18C).

Further, when the sewing is continued, the fabric is advanced to the next needle drop position, whereby the root on the fabric C side of the upper thread end U1 comes into contact with the cutting edge 44a of the upper thread processing knife 44 and is cut off ( FIG. 18 (D)). At this time, the clamp member 31 holds the state where the upper thread end portion after the excision is clamped until the next clamping described later.
When the sewing progresses and the needle drop position of the first stitch of the fabric C passes the lowered position of the upper thread processing knife 44, the control device 90 controls the knife driving air cylinder 46 by the electromagnetic valve 46c to control the upper thread. The treatment knife 44 is raised (step S6), and the lifting / lowering air cylinder 36 is controlled by the electromagnetic valve 36b to lower the clamp member 31 (step S7).

Thereafter, when the sewing is advanced to reach the final needle (step S8), after the needle drop, the driving of the sewing machine motor 15 is stopped at a predetermined upper stop position, and the thread trimming solenoid 16 is driven to move the lower side of the needle plate 13. Thus, the upper thread and the lower thread are cut (step S9: FIG. 18E).
Then, the control device 90 starts the suction of the suction nozzle 39 by the electromagnetic valve 39a (step S10), and controls the clamp air cylinder 33 by the electromagnetic valve 33b to execute the forward and backward movement of the clamp member, A new upper thread end portion U1 lowered from the sewing needle 11 is clamped (step S11).

Next, the control device 90 controls the X-axis motor 85 and the Y-axis motor 86 to position the final needle position of the fabric C at the remaining yarn processing position (position of the opening 14a of the needle plate auxiliary plate 14) (step S12). : FIG. 19 (A)).
As shown in FIG. 19A, when the thread trimming is executed after the needle drop of the final needle and before the lifting of the upper thread by the balance is completed, a stitch is formed at the needle drop position of the final needle. As a result, the lower thread D is not held at the needle drop position of the final needle, and the remaining thread hangs down from the needle drop position immediately before. Therefore, if the pitch of the final needle is set to be smaller than usual, the remaining yarn of the upper yarn U and the remaining yarn of the lower yarn D are closer to each other, and it is possible to perform better cutting. Become.

Then, the control device 90 controls the knife lifting air cylinder 74 by the electromagnetic valve 74b and raises the remaining yarn processing knife 66, 67 to contact the lower surface of the fabric C (step S13: FIG. 19B). . At substantially the same time, the control device 90 controls the electromagnetic valve 79a to start suction by the suction nozzle 79 (step S14). Thereby, the remaining yarn on the lower surface side of the fabric C is drawn toward the remaining yarn processing knife 66, 67 side. The suction may be started before the scalpels 66 and 67 are lifted.
Then, the control device 90 controls the cutting air cylinder 73 by the electromagnetic valve 73b, and rotates the remaining yarn processing knives 66 and 67 so as to close each other, thereby cutting the remaining yarn (Step S15: FIG. 19). C)). At this time, the cut remaining yarn is sucked into the suction nozzle 79 and collected.
Then, the scalpels 66 and 67 are lowered, the cloth holding frames 81 and 82 are returned to a predetermined standby position, the press-up air cylinder is controlled, the cloth holding frames 81 and 82 are raised, and the cloth C is released. Thus, the sewing is finished (step S16).

When the sewing target is sewing the crease H of the curtain, it is necessary to form two seams L1 and L2. In such a case, after forming the first seam L1 and performing the remaining thread cutting in step S15, the cloth holding frames 81 and 82 are not released, and the process returns to step S2 to form the second seam L2. You may move to.
If the first stitch L1 is formed by the process between steps S1 to S11, the remaining stitch process is not performed, and the second stitch L2 is formed by performing steps S2 to S11 again. The remaining thread processing for the seam L1 and the remaining thread processing for the second seam L2 may be performed together.

(Effect of the embodiment of the invention)
The sewing machine 10 includes the clamp mechanism 30 to prevent the occurrence of bird's nest on the lower surface of the fabric C, and effectively uses the upper thread end U1 that is projected on the upper surface of the fabric C by the upper thread processing device 40. It is possible to remove. In particular, the upper thread processing device 40 brings the upper thread processing knife 44 into contact with the upper surface of the fabric C, so that the remaining length of the upper thread end can be shortened more effectively.
Further, in the sewing machine 10, the clamp member 31 is lifted and cut while the upper thread end U1 is stretched, so that the upper thread end can be removed better.
Furthermore, since the sewing machine 10 is equipped with the suction nozzle 39 in the clamp mechanism 30, it becomes possible to prevent lint and dust from adhering to the fabric C.

In addition, the sewing machine 10 can cut the remaining yarn with the remaining yarn processing knife 66, 67 closest to the fabric C by the remaining yarn processing device 60, effectively reducing the remaining length of the remaining yarn. It becomes possible to do.
In addition, since the two scalpels 66 and 67 that are the remaining thread processing scalpels are disposed in the opening 14a of the throat plate auxiliary plate 14, the cloth C is moved along the upper surface of the throat plate auxiliary plate 14. Even if it exists, it is possible to make the knife 66, 67 approach the lower surface of the fabric C where the remaining yarn is generated easily.
Further, since the remaining yarn processing device 60 is also provided with the suction nozzle 79, it is possible to prevent the remaining yarn from litter and dust from adhering to the fabric C.

(Other)
In addition, as the upper thread processing knife 44, the above-described sewing machine 10 uses a passive machine utilizing movement on the fabric C side, but actively performs a cutting operation at the time of cutting with a pinch type or a clipper type. A knife may be used.

In the sewing machine 10, the clamp mechanism 30, the upper thread processing device 40, and the remaining yarn processing device 60 are applied to the sewing machine 10 that includes the cloth moving mechanism 80 that can move the cloth C by holding the cloth C with the cloth holding frames 81 and 82. However, the present invention is not limited to this example.
For example, the clamp mechanism 30, the upper thread processing device 40, and the remaining yarn processing device 60 are connected to a sewing machine that linearly feeds a cloth in a certain direction by cooperation with a stationary cloth presser foot frequently used in a general sewing machine and a feed dog. May be applied.
However, in that case, it is only necessary that the knife 66, 67 of the remaining yarn processing device 60 can be arranged in the immediate vicinity of the cloth feed. When 66 and 67 abut from below at the time of excision, since there is nothing to support the fabric C, it may occur that the excision cannot be performed satisfactorily. Accordingly, in the case where the fabric C without such a strain is targeted, the remaining yarn processing position is provided with a presser spring 99 that holds the fabric C from above so that the fabric C does not rise as the knife 66 or 67 rises as shown in FIG. May be provided.

  In addition, the sewing machine 10 is an example of a sewing machine having the fold portion H of the curtain as a sewing target, and is suitable for sewing a fold portion having many inclined portions. However, the sewing machine 10 is not limited to the fabric of the curtain. Alternatively, various sewing products that require the removal of the upper thread end or the remaining thread after cutting may be used as the sewing target.

  In addition, the above-described upper thread processing device 40 has a structure in which the upper thread processing knife 44 is lowered obliquely downward, but is equipped with a slide member 42 and a knife driving air cylinder 46 in a vertical direction, and a knife holder 43. Further, a front / rear moving air cylinder 110 as a front / rear moving means for moving the upper thread treatment knife 44 back and forth may be added (FIG. 21). Thus, even if the lowering position of the upper thread processing knife 44 is away from the sewing needle 11, the upper thread end can be cut off at a position close to the sewing needle 11 by moving the upper thread processing knife 44 forward. .

In the above example, the upper thread processing knife 44 and the remaining thread processing knife 67 are both brought into contact with the fabric C. However, it may be configured to perform cutting at a position away from each other while approaching.
For example, as in the example shown in FIG. 22, for the upper thread processing knife 44, the height-adjustable screw that contacts the upper surface of the pressing portion 82 b of the first cloth holding frame 81 or the second cloth holding frame 82. A knife height adjusting means 100 composed of a stopper 103 and a fastening nut 101, 102 for fastening the stopper 103 is provided on the attachment portion 43b of the knife holding body 43 so that the knife height when lowered can be adjusted. It is good also as adjustment possible so that it may not touch, although it adjoins.
Similarly, as shown in FIG. 23, with respect to the remaining yarn processing knives 66 and 67, a screw-type stopper 123 capable of adjusting the height that comes into contact with the lower surface of the throat plate auxiliary plate 14 and a fastening nut 121 for fastening the same. A knife height adjusting means 120 constituted by 122 is provided on the attachment portion 64a of the fourth frame body 64 holding the knife so that the knife height can be adjusted at the time of ascending and descending, and it is close to the fabric C but does not come into contact with it. It is good also as adjustment possible.

10 sewing machine 11 sewing needle 12 needle bar 13 needle plate (mounting part)
14 Needle plate auxiliary plate (mounting part)
14a Opening 30 Clamp mechanism 34 Lower block (clamp moving means)
35 Upper block (clamp moving means)
36 Lifting air cylinder (clamp moving means)
37 Slide member (clamp movable means)
38 Slide guide (clamp moving means)
39 Suction nozzle (collection means)
40 Upper thread processing device 44 Upper thread processing knife 45 Pressing spring 46 Female drive air cylinder (female drive means)
60 Remaining yarn processing device 66 First knife (remaining yarn treatment knife)
67 Second knife (residual thread treatment knife)
74 Air cylinder for raising and lowering the knife (female raising and lowering means)
75 Transmission spring 79 Suction nozzle (suction means)
80 Cloth moving mechanism (moving mechanism)
81 First cloth holding frame (holding frame)
82 Second cloth holding frame (holding frame)
C Fabric (Sewing product)
D Lower thread U Upper thread U1 Upper thread end

Claims (6)

A needle bar to hold the sewing needle;
A needle up-and-down movement mechanism that moves the needle bar up and down;
A thread trimming device for cutting the upper thread and the lower thread after forming a seam on the lower side of the needle plate;
A remaining thread processing device for removing the remaining thread after cutting on the sewing product side by the thread trimming device from the sewing product,
The remaining thread processing device includes a remaining thread processing knife that cuts the remaining thread at a position that directly faces the lower surface of the workpiece, and a suction unit that sucks the remaining thread toward the remaining thread processing knife. Characteristic sewing machine. The remaining thread treatment knife is disposed in an opening formed on the upper surface of the placing portion located on the lower side of the sewing product at the time of sewing,
The sewing machine according to claim 1, further comprising a knife lifting means for holding the remaining thread processing knife and raising the remaining thread processing knife toward a position directly opposed from below toward the lower surface of the sewing object.   3. The sewing machine according to claim 2, wherein the knife lifting means abuts the remaining thread processing knife with respect to the sewing product via a spring.   The sewing machine according to any one of claims 1 to 3, further comprising an adjusting unit that adjusts an inclination angle of a blade surface of the remaining yarn processing knife. A holding frame for holding the sewing product;
A moving mechanism for arbitrarily moving the sewing object along a plane via the holding frame;
A sewing control unit that performs needle drop at an arbitrary position of the sewing object that is predetermined by the operation control of the moving mechanism,
The sewing machine according to any one of claims 1 to 4, wherein the sewing control unit positions a needle drop position of a final needle at an attachment position of the remaining thread processing knife after formation of a seam. A clamp mechanism for holding the upper thread end portion remaining on the sewing needle side by the cutting of the thread trimming device;
An upper thread processing device that cuts the upper thread end held by the clamp mechanism at the needle drop position of the first stitch of the sewing product,
The upper thread processing device holds an upper thread processing knife that cuts the upper thread end from the sewing product, and holds the upper thread processing knife, and directly faces the upper thread processing knife to the upper surface of the sewing product. The sewing machine according to any one of claims 1 to 5, further comprising a knife driving means for lowering the position to a position.

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