JP2006280922A - Sewing machine for winding thread shank to button and button sewing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the lowering of a sewing quality while suppressing the stretching of a fabric when sewing a button to a relatively stretchy fabric such as a knit and winding a thread shank. <P>SOLUTION: This sewing machine forms winding a thread shank to the thread T by disposing the both of a pair of clamping members 6 at such an interval as forming an opening part 62 wider than a prescribed stitch width and by locating a sewing needle from a part between the both clamping members of the thread T for a shank and on the both sides adjacent to the fabric of the thread T to the adjacency to the button. This sewing machine is provided with a pair of guide members 8 detachably provided in the opening part 62, clamping the fabric W opposite to a retaining part and disposed at such an interval as forming a threader part 82 with the interval sufficient for inserting the thread and being narrower than the prescribed stitch width. The control device controls respective driving devices to locate the sewing needle in the both sides from the adjacency to the side of the button side of the pair of guide members 8 of the thread T to the adjacency to the button B and form the stitches to the button-neck thread T. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a root winding button sewing machine and a button attaching method using the root winding button sewing machine.

2. Description of the Related Art Conventionally, a root winding button sewing machine is known in which a button is sewn on a cloth and a thread is wound around a root thread (sewing thread) between the button and the cloth to form a root winding (see, for example, Patent Document 1). ).
When performing buttoning on the cloth using the root winding button sewing machine, as shown in FIGS. 9 to 11, the cloth 116 is set so as to wrap the tip 111a of the tongue 111, and the tongue is maintained while maintaining the state. The front end 111 a of 111 is brought close to the support base 112. A tongue sensor (not shown) is provided in the vicinity of the support base 112, and the tongue sensor is driven by the tongue cylinder 118 by detecting the tip end portion 111 a of the tongue 111, so that the tongue 111 stands on the support base 112. It is pulled in until it hits the sandwiched member 113. Thereby, the cloth 116 is held between the tongue 111 and the holding member 113 in a folded state. Here, as shown in FIGS. 9 and 10, the pair of clamping members 113 and 113 are arranged so as to form an opening 113a through which the root thread 114 is passed when performing root winding sewing. The opening 113a is formed wider than the needle swinging width. During rake stitching, the button 115 is set substantially horizontally above the cloth 116 by a chuck mechanism (not shown), and rake stitching is performed.

When root winding is performed after rake stitching, as shown in FIGS. 10 and 11, the chuck mechanism rotates so that the back side of the button 115 faces the tongue 111 side after rake stitching, as shown in FIGS. Is rotated 90 degrees to hold the root thread 114 formed by scoop sewing in a straight line. When the button 115 is held in this manner, the button 115 stands and the cloth 116 is slightly pulled toward the button 115, and the root thread 114 between the button 115 and the knot portion C of the cloth 116 is moved in the front-rear direction. It is possible to sew root winding. In this state, by sewing the needle 117 on both sides of the root thread 114 from the opening 113a to the vicinity of the button 115 while moving the sewing needle 117 up and down, a seam of chain stitch is formed with the looper (not shown). Then, the root winding sewing is performed on the root yarn 114 that extends from the closest portion of the root yarn 114 to the vicinity of the button 115. That is, in the conventional root winding button sewing machine, it is necessary to form the root winding sewing as close as possible to the cloth of the root thread 114, so that the holding members 113 are arranged at intervals wider than the needle swing width.
JP 2002-355453 A

However, when the button 115 is sewed on a cloth 116 that is relatively easy to stretch, such as knit, and the root winding sewing is performed, as shown in FIGS. 10 and 11, the tension applied when the root thread 115 is maintained in a straight shape. The cloth 116 is greatly pulled by the force and the cloth is lifted. If the root winding sewing is performed in this state, as shown in FIG. 12, the needle drop position becomes the point S, and the root winding sewing is performed on the cloth 116, and there is a problem that the quality of the sewing product is deteriorated. It was.
If the needles are dropped on both sides of the portion L in FIG. 10 so as to avoid the portion where the fabric 116 is lifted to match the fabric 116, the fabric 116 can be viewed from the nearest position without forming a seam by root winding sewing. The root winding sewing becomes possible. However, because the sewing object formed of an easily stretchable cloth such as knit differs depending on the attachment position of the button 115, it is necessary to determine the needle drop position with a margin so that the needle does not drop on the cloth 116. As a result, there is a problem that the root winding stitch cannot be formed immediately from the cloth 116.

  Further, when performing the root winding sewing, the root thread 114 of the root winding sewing is fixed to the cloth 116, and in the vicinity of the knot portion C (point A in FIG. 10) of the root thread 114 of the cloth 116 before the root winding sewing. It is necessary to form a seam. However, when the needle drop is made so as to avoid the portion where the cloth 116 is lifted in accordance with the cloth 116, when the needle drop of the first stitch is formed on the cloth 116 in the lifted state, the cloth 116 Since the vertical position of 116 is not fixed, the cloth 116 rises together with the sewing needle 117 when the sewing needle 117 rises, and the entire loop of the sewing thread formed below the cloth 116 also rises together with the sewing thread. Therefore, there is a problem that the looper cannot catch the thread, the seam is not formed normally, and the sewing thread and the cloth 116 cannot be securely fixed.

Accordingly, the present invention has been made to solve the above-described problems, and when a button is attached to a relatively easy-to-extend cloth such as a knit to perform root winding sewing, the cloth is restrained from being stretched to reduce the quality of a sewing product. It is an object of the present invention to provide a sewing machine and a buttoning method with a root winding button that can prevent the above-described problem.
A further object of the present invention is to prevent the fabric from floating when performing root winding sewing.

  In order to solve the above-described problems, the invention according to claim 1 is directed to a seam for chain stitching in cooperation with a needle plate having a needle hole through which a sewing needle is inserted and a sewing needle provided below the needle plate. A looper to be formed, a needle bar driving device that moves a needle bar that holds a sewing needle up and down, and a button that is arranged between the needle bar and the needle plate and sewn on the cloth by a root thread is held in a vertical state. A button holding member, a button holding member driving device that moves the button holding member back and forth, and a needle swing drive that swings the needle bar to cause the sewing needle to fall on both sides of the root thread with a predetermined swing width. An apparatus, a support base that moves back and forth together with the button holding member, and a holding portion that holds the cloth in a folded state at a knot portion of the root yarn, and the cloth and the button holding member held by the holding portion It was spanned between the buttons held in A cloth that is supported by the support base and moves back and forth on the needle plate so as to be positioned on a passing line of the sewing needle while maintaining a straight line along a direction substantially perpendicular to the needle swinging direction of the sewing needle. The holding member and the root thread are arranged on both sides of the path of the root thread from the cloth held by the cloth holding member to the button so that the root thread can be inserted, and extend upward from the support base to the holding portion. A pair of clamping members that are opposed to each other and clamp the cloth between the holding units; and a control device that controls the driving of each of the driving devices. Both of the pair of clamping members are both clamping members. Are arranged at intervals to form an opening wider than the predetermined swing width so as to allow needle drop to both sides of the root yarn in the immediate vicinity of the cloth. A needle is placed between the both clamping members of the root yarn and in the vicinity of the root yarn cloth. In a root-winding button sewing machine that forms needle-wrapped seams in the root thread by dropping needles on both sides from both sides to the vicinity of the button, it is detachably provided in the opening, and holds a cloth facing the holding portion And a pair of guide members that are arranged at intervals that form threading portions that are capable of inserting the root thread and that are narrower than the predetermined swing width, and the control device is configured to connect the sewing needle to the root thread. The root thread is formed in the root thread by controlling the driving devices so that the needle drops on both sides of the pair of guide members from the closest side to the button side.

  According to the first aspect of the present invention, the pair of guide members are opposed to the holding portion so as to sandwich the cloth, and the interval at which the root thread can be inserted and the threading portion having an interval narrower than the predetermined swing width is formed. By disposing the guide member, the guide member faces the holding portion when the holding portion of the cloth holding member is brought close to the passing line of the sewing needle. Thus, the guide member functions as a holding member that holds the cloth with the holding portion, and covers the opening formed in the holding member. In addition, since a threading portion having a width narrower than the amplitude of the sewing needle is formed between the pair of guide members, a button is sewn on a cloth that is relatively easy to stretch, such as a knit, and the root winding sewing is performed. When performing the root winding sewing, the portion where the cloth is pulled to the button side by the clamping member and the guide member is greatly reduced even if the cloth is pulled by the tensile force applied when maintaining the root thread in a straight line. Can prevent the fabric from floating.

  In addition, the control device controls each driving device so that the sewing needle is dropped on both sides of the pair of guide members of the root thread from the side near the button side to the vicinity of the button, and the root thread is stitched to the root thread. Form. Thereby, while avoiding interference with a guide member and a sewing needle, since the needle drop position at the time of root winding sewing can also be brought close to cloth, a root winding defect does not arise.

  Therefore, the guide member suppresses the stretch of the cloth when performing the root winding sewing, and the root winding sewing can be formed on the root thread without forming the root winding seam on the cloth. Even when a button is attached to an easily stretchable cloth and root winding sewing is performed, deterioration of the quality of the sewing product can be prevented.

  The invention according to claim 2 is the buttoning method using the root winding buttoning sewing machine according to claim 1, wherein when the root winding sewing is performed, the control device causes the sewing needle to be attached to the root thread. And a control step of controlling each of the driving devices so as to cause needle drops on both sides of the pair of guide members from the button-side side surface to the vicinity of the button to form a root seam in the root thread.

  According to the second aspect of the present invention, the pair of guide members are opposed to the holding portion so as to sandwich the cloth, and the interval for forming the threading portion that allows the root thread to be inserted and is narrower than the predetermined swing width. By disposing the guide member, the guide member faces the holding portion when the holding portion of the cloth holding member is brought close to the passing line of the sewing needle. Thus, the guide member functions as a holding member that holds the cloth with the holding portion, and covers the opening formed in the holding member. In addition, since a threading portion having a width narrower than the amplitude of the sewing needle is formed between the pair of guide members, a button is sewn on a relatively stretchable cloth such as a knit to perform root winding sewing. When performing the root winding stitching, the portion where the cloth is pulled to the button side by the clamping member and the guide member is greatly reduced even if the cloth is pulled by the tensile force applied to keep the root thread straight. Can prevent the fabric from floating.

  Further, in the control step, the control device controls each driving device so that the sewing needle is dropped on both sides of the pair of guide members of the root thread from the nearest side of the button side to the vicinity of the button, thereby winding the root thread around the root thread. Form seams. Thereby, while avoiding interference with a guide member and a sewing needle, since the needle drop position at the time of root winding sewing can also be brought close to cloth, a root winding defect does not arise.

  Therefore, the guide member suppresses the stretch of the cloth when performing the root winding sewing, and the root winding sewing can be formed on the root thread without forming the root winding seam on the cloth. Even when a button is attached to an easily stretchable cloth and root winding sewing is performed, deterioration of the quality of the sewing product can be prevented.

  According to the present invention, the guide member suppresses the elongation of the cloth when performing the root winding sewing, and the root thread can be formed on the root thread without forming the root winding seam on the cloth. Thus, even when a button is attached to a relatively easy-to-extend cloth and root winding sewing is performed, deterioration of the quality of the sewing product can be prevented.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best mode of a root winding button sewing machine according to the present invention will be described in detail with reference to the drawings.
<Configuration of sewing machine with root winding button>
FIG. 1 shows a schematic configuration of the outer appearance of the root winding button sewing machine 1 together with a block diagram of the control circuit. FIGS. 2 and 3 show parts of the root winding button sewing machine 1 where buttoning is performed. A perspective view is shown. The root winding button sewing machine 1 includes a bed portion 2, a vertical trunk portion 3 standing from the bed portion 2, and an arm portion 4 extending from the vertical trunk portion 3 so as to face the bed portion 2. ing. In the following description, the front-rear direction and the up-down direction of the root-wrap button sewing machine 1 are as shown in FIG. 1, and are defined as the Y-axis direction and the Z-axis direction, respectively. Further, the direction perpendicular to the paper surface of FIG. 1 is the left-right direction (X-axis direction), the front surface side of the paper surface is the right side, and the back surface side of the paper surface is the left side.

The root winding button sewing machine 1 is fixed to the tip of a needle bar 9 provided at the tip of the arm portion 4, and is provided so as to face the sewing needle 5 in the bed portion 2 and the sewing needle 5 through which the thread is passed. The button B (see FIG. 7) is automatically sewn to the cloth W (see FIG. 7) automatically in cooperation with the looper (not shown). The looper is provided below a needle plate having a needle hole through which the sewing needle 5 is inserted, and forms a seam for chain stitching in cooperation with the sewing needle 5. Since the formation of the seam such as the operation of the looper is a well-known technique, a detailed description thereof is omitted.
The root-winding button sewing machine 1 can perform various button-sewing operations by independently transporting the button B, the cloth W and the like independently.

(Needle vertical movement mechanism)
The needle bar 9 is moved up and down via a crank mechanism with a main shaft motor 14 as a needle bar driving device for moving the needle bar 9 holding the sewing needle 5 up and down in the Z-axis direction. The needle bar 9 is supported by a needle bar support that can swing about the Y-axis direction (front-rear direction) so as to be vertically movable. Therefore, the needle bar 9 can swing the sewing needle 5 held at the lower end thereof while moving up and down along the X-axis direction (left-right direction). The needle bar support swings the needle bar 9 in a direction (X-axis direction) substantially orthogonal to the vertical movement direction of the needle bar 9, and puts the sewing needle 5 on both sides of the root thread T (see FIG. 7). A needle swing motor 20 that is a pulse motor serving as a needle swing driving device that drops the needle with the swing width is used as a drive source. The needle swing motor 20 is driven and controlled in synchronism with the spindle motor 14 so as to be at the bottom dead center when the sewing needle 5 is positioned at both ends of the swing when the needle swing motor 20 is driven. Further, the needle swing motor 20 swings the needle bar 9 to drop the needle B with a predetermined swing width on both sides of the root thread T for sewing the button B to the cloth W.

(Button holding mechanism)
The button B is supported by the lower part of the middle part of the arm part 4 and is held by a button holding arm 34 as a button holding member whose tip part extends to the vicinity of the vertical movement path of the sewing needle 5. The button holding arm 34 is supported at the base end of the button holding arm 34 so as to be movable along the Y-axis direction with respect to the arm portion 4 and is driven by the upper Y-feed motor 32 in the Y-axis direction. It has become.
Further, the button holding arm 34 is supported so that the base end portion thereof can swing around the X-axis direction, and a vertical drive motor 35 is provided at the base end portion. By the vertical drive motor 35, the button B held on the distal end side of the button holding arm 34 can move up and down.

The button holding arm 34 is disposed between the needle bar 9 and the needle plate at the tip of the button holding arm 34 and holds the button B sewn on the cloth W with the root thread T in a state where the surface of the button B is perpendicular to the needle plate. A chuck mechanism 34a (see FIG. 2) is provided as a button holding member for holding the button so that the button B is sandwiched from both sides in the left-right direction.
The chuck mechanism 34a is mounted at the tip of the button holding arm 34 so as to be rotatable about the left-right direction, and the angle can be switched in a range of 90 degrees by a rotating cylinder 37 operated by air. ing. That is, the rotary cylinder 37 can be switched between a normal holding position where the chuck mechanism 34a holds the button B horizontally and an upright holding position where the bottom surface of the button B stands up. When the button B is in the horizontal state, rake stitching or solid stitching is performed, and when the button B is in the standing state, root winding sewing is performed.
The chuck mechanism 34a is also provided with a differential motor 72 for moving and positioning the button B in the X-axis direction with respect to the button holding arm 34 via the chuck mechanism 34a. By controlling the differential motor 72, the button B can be positioned at an arbitrary position in the X-axis direction.

(Around bed and tongue)
As shown in FIGS. 2 and 3, a frame 21 that supports the cloth W is provided on the upper surface of the bed portion 2 when performing normal button sewing (so-called solid stitching) that is not rake stitching. ing.
On the side of the vertical torso 3 of the bed portion 2, a lower plate 41 for placing a cloth W on which a button B is to be sewn on the needle plate 40, and a cloth W placed on the lower plate 41 are held. A second cloth presser 42 and a force button holding portion 43 for holding a force button attached to the back side of the cloth W with respect to the button B are provided.

The lower plate 41 is disposed on the upper surface of the bed portion 2 and in the vicinity below the sewing needle 5 disposed at a predetermined sewing position. On the upper surface of the lower plate 41, the cloth W is placed when performing solid stitching.
The solid stitching is performed without using the tongue 57 described later, and the button B is arranged on the lower plate 41 so as to extend along the surface of the cloth W that is spread substantially perpendicularly to the sewing needle 5. In this state, the sewing is performed by passing the sewing needle 5 and the sewing thread from above to the back surface of the cloth W.

  The second cloth presser 42 is disposed above the lower plate 41 and is supported so as to move up and down. The second cloth presser 42 is pressed against the cloth W placed on the lower plate 41 from above to hold the cloth W. Is for doing.

The force button holding portion 43 is provided below the placement surface of the cloth W on the lower plate 41, and includes a claw that presses and holds the force button from three sides on the outer periphery thereof. It is held in a state along the mounting surface of the plate 41 (a state where the button hole of the force button is along the Z-axis direction).
Further, the force button holding portion 43 allows the sewing needle 5 to be inserted below the lower plate 41 through a gap provided between the claws when the force button is not held.
The force button is a button that is sewn together with a normal button (front (upper) button) on the back of the cloth W when performing button sewing, and is used only for sewing a normal button. Unlike a normal button, it does not have a function to hold the open part of the clothes. Such a force button may have a size that is not different from that of a normal button, but generally a button that is smaller than a normal button is often used.

Next, the configuration of the bed part 2 will be described with reference to the drawings.
Here, FIG. 3 is a perspective view showing the first cloth presser 59 and the cloth presser moving mechanism part 55 provided in the bed part 2.
As shown in FIGS. 2 and 3, the cloth W is folded back by the holding portion 57a at the tip of the bed portion 2, and the holding portion 57a is brought close to the passing line of the sewing needle 5 and is held by the chuck mechanism 34a. The cloth W folded by the holding portion 57a while being held in a straight line while holding the root thread T stretched between the button B and the cloth W is supported by the frame 21 so as to be positioned on the passing line of the sewing needle 5. A tongue 57 as a cloth holding member that moves in the front-rear direction on the needle plate 40, a holding member 6 that holds the cloth W with the tongue 57 at a holding position (described later), and a cloth W held by the tongue 57 A first cloth presser 59 that presses and holds the tongue 57 from above, a tongue moving mechanism 58 that rotates the tongue 57 about the axis in the X-axis direction, and a cloth presser that moves the first cloth presser 59 up and down. Moving mechanism portion 55 is provided. .

The tongue 57 is a member formed in an arm shape, and a base end portion thereof is supported by a lower end portion on the distal end side of the bed portion 2 so as to be rotatable around an axis in the X-axis direction.
Further, at the tip of the tongue 57, the cloth W to be sewn with the button B is held in the bent state at the time of the rake sewing, and the cloth W is attached when the root winding sewing is performed after the rake sewing is formed. The root thread T formed by scoop sewing is held in a folded state at a knot portion C (see FIG. 8). A holding portion 57a is provided. The holding portion 57a extends along the Y-axis direction, is formed in a substantially flat plate shape, and is formed in a substantially wedge shape whose thickness decreases toward the tip portion. And the holding | maintenance part 57a is set so that the flat plate surface may be in the state along XY plane in the holding position.
In addition, a semicircular cutout 57b is formed in the holding portion 57a of the tongue 57, and the cutout 57b is formed when button sewing is performed by rake sewing on the cloth W mounted in a folded state. The structure is such that interference between the holding portion 57a of the tongue 57 and the sewing needle 5 is avoided. The frame 21 and the tongue 57 as a support base are supported by the rear main body of the bed portion 2 so as to be movable in the Y-axis direction. It is possible to do. That is, the button holding arm 34 and the frame 21 are driven by the upper Y feed motor 32 and the lower Y feed motor 51, respectively, but the button holding arm 34 and the frame 21 are synchronized with each other while maintaining the distance in the front-rear direction. Then move forward and backward. Accordingly, the frame 21 moves back and forth together with the button holding arm 34.

The tongue moving mechanism 58 is provided on the positive X-axis direction side of the frame 21 arranged along the bed 2, and has a tongue cylinder 582 for moving the output rod 581 forward and backward to drive the tongue 57, and one end thereof. A tongue link 583 is attached to one end portion of the output rod 581 so as to be rotatable about an axis in the X-axis direction, and the other end portion is fixed to a proximal end portion of the tongue 57 on the rotation center side.
When the tongue cylinder 582 is driven under the control of the electrical equipment box 101 (see FIG. 1) as the control device, the tongue moving mechanism 58 moves the tongue 57 to the holding position of the cloth W and the release position of the holding. The position can be switched. Specifically, the holding position where the cloth W is positioned on the vertical movement path of the sewing needle 5 by rotating the tongue 57 around the axis in the X-axis direction via the tongue link 583 by the advancement and retraction of the output rod 581. The position of the holding portion 57a of the tongue 57 can be switched between (see FIG. 2) and a release position (see FIG. 4) where the cloth W is released from being separated from the vertical movement path of the sewing needle 5.
Here, the tongue cylinder 582 applies a driving force for moving the tongue 57 between the holding position and the release position of the cloth W.

  It should be noted that when a turning operation in the direction toward the holding position of the tongue 57 located at the release position is detected by a predetermined sensor based on the manual operation of the operator, the tongue is controlled under the control of the electrical box 101. The holding portion 57a can be automatically set so as to be positioned below the sewing needle 5 by driving the cylinder 582.

  As shown in FIG. 3, the first cloth presser 59 includes a Y-axis extending portion 591 that extends substantially in the Y-axis direction along the negative X-axis direction surface of the frame 21, and a Y-axis extending configuration. From the positive Y-axis direction end of the portion 591, the Z-axis extending portion 592 extending in the substantially Z-axis direction so as to be substantially perpendicular to the frame 21, and the upper end of the Z-axis extending portion 592 While extending in the positive Y-axis direction so as to be substantially parallel to the upper surface of the bed portion 2, the tip end portion is on the positive X-axis direction side to a position where it substantially overlaps the central portion of the holding portion 57 a of the tongue 57. A curved extending portion 593 that is curved, and extends from the tip of the curved extending portion 593 substantially perpendicularly to the upper surface of the bed portion 2 and contacts the upper surface of the cloth W bent by the holding portion 57a of the tongue 57. And a contact portion 594 in contact therewith.

The Y-axis extending portion 591 is formed around a shaft center in the X-axis direction by, for example, a stepped screw 21c pivotally supported by the frame 21 being screwed into a screw hole formed at the end on the negative Y-axis direction side. It is rotatably supported by.
Further, a guide hole 595 for guiding the rotation of the Y-axis extending portion 591 and restricting the rotating operation is formed on the Z-axis extending portion 592 side of the Y-axis extending portion 591, and this guide is formed. A guide shaft 21a provided in the frame 21 is inserted into the hole 595, and the first cloth presser 59 is prevented from coming off by a retaining member 21b such as a nut. Specifically, the guide hole 595 is formed in, for example, an oval shape along the Z-axis direction, and the rotation distance of the first cloth presser 59 is defined according to the length. .
Further, a cloth presser link 553 of a cloth presser moving mechanism part 55 described later is connected to the Z-axis extended part 592 side further than the guide hole 595 of the Y-axis extended part 591.

  The curved extending portion 593 extends in the positive Y-axis direction from the front end of the bed portion 2, and when the tongue 57 is retracted to the retracted position, the tongue 57 and the upper surface of the bed portion 2 in the retaining position It is possible to move below the height.

The cloth presser moving mechanism section 55 is attached to the cloth presser cylinder 552 for moving the output rod 551 forward and backward to give the first cloth presser 59 a driving force for vertical movement, and one end is attached to one end of the output rod 551. The other end portion includes a cloth presser link 553 attached to the Y-axis extending portion 591.
Then, the cloth presser moving mechanism unit 55 is controlled by the electrical box 101, and the cloth presser cylinder 552 is driven to move the output rod 551 forward and backward so that the Y-axis extending part 591 has a negative Y-axis direction side. The first cloth presser 59 can be rotated around the axis in the X-axis direction with the end of the axis as the axis. Specifically, when the cloth presser cylinder 552 is driven to push out the output rod 551, the first cloth presser 59 is rotated so as to move in the positive Z-axis direction, and the curved extension portion The abutment portion 594 of the 593 can be positioned above the holding portion 57a. At this time, for example, the guide shaft 21a abuts on the lower inner surface of the guide hole 595, whereby the first cloth presser 59 rotates. The movement is stopped. In this way, the first cloth presser 59 can be moved to the standby position above the tongue 57.

  Further, when the cloth presser cylinder 552 is driven to retract the output rod 551, the first cloth presser 59 is rotated so as to move in the negative Z-axis direction, and the holding portion 57a disposed at the holding position. In this case, for example, when the guide shaft 21a comes into contact with the upper inner surface of the guide hole 595, the rotation operation of the first cloth presser 59 is stopped. In this way, the first cloth presser 59 can be moved to the retracted position below the tongue 57 in the holding position.

  Here, the movement of the first cloth presser 59 in the Z-axis direction is restricted by the tongue 57 in a state where the tongue 57 is arranged at the holding position. That is, in a state where the tongue 57 bent from the cloth W is disposed at the holding position, when the first cloth presser 59 located above the holding portion 57a of the tongue 57 is moved in the negative Z-axis direction, The movement comes into contact with the upper surface of the cloth W bent by the holding portion 57a, and the movement is stopped. In this way, the first cloth presser 59 can be moved to an operating position where the first cloth presser 59 comes into contact with the tongue 57 in the holding position via the cloth W during the button sewing. One cloth presser 59 is pressed.

Of the above configuration, the lower plate 41, the second cloth presser 42, the tongue 57, the clamping member 6, the first cloth presser 59, the tongue moving mechanism 58 and the cloth presser moving mechanism 55 are integrated into the lower part. It is possible to move and position together with the frame 21 in the Y-axis direction according to the driving of a lower Y-feed motor 51 (see FIG. 1) of a Y-feed mechanism (not shown).
That is, below the sewing needle 5, the frame 21 switches between a sewing position by button sewing for positioning the lower plate 41 and a sewing position by button sewing for positioning the holding portion 57 a of the tongue 57 and the clamping member 6. It is possible.

(Clamping member)
As shown in FIGS. 2 to 5, the upper surface of the front end portion of the frame 21 faces the holding portion 57 a of the tongue 57, prevents further rotation of the tongue 57, and holds the holding portion 57 a of the tongue 57. A pair of clamping members 6 for clamping the cloth W is provided.
The clamping members 6 are arranged on both sides of the route of the root yarn T from the knot portion C (see FIG. 8) of the root yarn T to the button B in the cloth W held by the tongue 57 so that the root yarn T can be inserted. Then, the cloth W is sandwiched between the holding portion 57a and the holding portion 57a so as to extend upward from the frame 21. The clamping member 6 is formed from a plate material extending in the X-axis direction, and is fixed to the upper surface of the needle plate 40. Here, the clamping member 6 is comprised from a pair of board | plate material, and is integrally formed in the base end part with the attachment board 61 which connects each other clamping member 6. FIG. Note that the clamping member 6 may be detachably provided on the throat plate 40 without providing the attachment plate 61.

The clamping member 6 is provided so as to be substantially perpendicular to the needle plate 40, and is formed so as to be aligned with the holding portion 57a of the tongue 57 along the Y-axis direction. The clamping member 6 is disposed at an interval that forms an opening 62 wider than a predetermined swinging width so as to allow the needle drop between the both clamping members 6 and on both sides of the root yarn T in the vicinity of the cloth. .
The opening 62 is a root that connects the button B and the cloth W when the button B is rotated 90 degrees by the chuck mechanism 34a of the button holding arm 34 after the button B is sewn to the cloth W by scoop sewing. The path of the thread T is formed.

  Further, as shown in FIG. 5, the attachment plate 61 of the clamping member 6 has notches 57b and Z formed on the holding portion 57a of the tongue 57 when the tongue 57 is brought close to the passing line of the sewing needle 5. The notches 6a are formed so as to be aligned in the axial direction, and when the button W is sewn on the cloth W mounted in the folded state by scooping, the notches 6a are formed between the clamping member 6 and the sewing needle 5. It has a structure that avoids interference.

(Guide member)
As shown in FIG. 2 to FIG. 5 and FIG. 8, a guide member 8 is provided on the upper surface of the holding member 6 to narrow down the opening area of the opening 62 formed between the holding members 6.
The guide member 8 is detachably provided in the opening 62, holds the cloth W opposite the holding portion 57a, and allows the root thread T to be inserted therethrough, and the threading section 82 having a narrower interval than the predetermined swing width. Are arranged at intervals to form. Here, the guide member 8 is composed of a pair of plate members extending in the X-axis direction, and is formed integrally with a mounting plate 81 for connecting the guide members 8 to each other at the base end portion. Note that the guide member 8 may be provided detachably on the needle plate 40 without providing the mounting plate 81.
The guide member 8 is fixed to the needle plate 40 together with the holding member 6, is provided so as to be substantially perpendicular to the needle plate 40, and is formed so as to be aligned with the holding portion 57 a of the tongue 57 along the Y-axis direction. Has been. The clamping member 6 is disposed at an interval that forms an opening 62 wider than a predetermined swinging width so as to allow the needle drop between the both clamping members 6 and on both sides of the root yarn T in the vicinity of the cloth. .
Further, the guide member 8 is formed so that the front surface thereof is substantially flush with the front surface of the sandwiching member 6 when attached to the sandwiching member 6. Thus, the cloth W held by the holding portion 57a of the tongue 57 can be held between the holding member 6 and the guide member 8.
The threading portion 82 sews the root thread T that connects the button B and the cloth W when the button B is rotated 90 degrees by the chuck mechanism 34a of the button holding arm 34 after the button B is sewn to the cloth W by scoop sewing. Has a function to be inserted.

Further, the guide member 8 is formed such that the thickness of the needle plate 40 in the moving direction (Y-axis direction) is thinner than the thickness of the sandwiching member 6 in the Y-axis direction, and the guide member 8 is provided on the sandwiching member 6. In addition, the rear surface of the guide member 8 is recessed toward the distal end side of the needle plate 40 from the rear surface of the clamping member 6.
Further, as shown in FIG. 5, the guide member 8 is aligned with the notch 57 b formed in the holding portion 57 a of the tongue 57 in the Z-axis direction when the tongue 57 is brought close to the passing line of the sewing needle 5. In this way, the notch 8a is formed, and when the button W is sewn to the cloth W mounted in the folded state by scoop sewing, the notch 8a causes the guide member 8 and the sewing needle 5 to interfere with each other. It has a structure to avoid.
Since the guide member 8 is detachable from the clamping member 6, a guide member having a notch that varies depending on the sewing conditions can be appropriately replaced.

(Control system of sewing machine with a button on the root)
Next, the control circuit of the root winding button sewing machine 1 will be described with reference to FIG. The neck winding button-equipped sewing machine 1 is provided with an electrical box 101 as a control device for controlling the driving of each of the above-described driving devices, and each part is connected to the electrical box 101.
An operation panel 103, a power switch 104, a start pedal 105, and a temporary stop switch 106 are connected to the electrical equipment box 101.
The operation panel 103 allows the operator to select the type of button attachment from rake sewing without root winding stitch, rake root winding sewing, lower button sewing, sticky sewing, etc., and input sewing conditions for the selected button sewing Or a set sewing condition or sewing status is displayed. As the sewing conditions to be set, for example, the number of crossovers between the button holes, the distance between the cloth and the button, the button height H (see FIG. 10), and the above-described guide member 8 are used to perform the root winding sewing. Whether or not the guide member use mode is executed. Further, an external memory 103a can be connected to the operation panel 103, and the sewing conditions can be set by reading the sewing data from the external memory 103a.
Conversely, various sewing conditions input from the operation panel 103 can be stored in the external memory 103a.

Further, the electrical box 101 is provided with a CPU 102 that performs arithmetic processing based on a control program or the like. The CPU 102 is connected to a memory 102a, and various programs such as a control program are stored in the memory 102a. . In particular, in the memory 102a, each drive device is controlled so that the sewing needle 5 is dropped on both sides of the guide member 8 of the root thread T from the side of the button side of the guide member 8 to the vicinity of the button. Is stored. Specifically, the sewing control program stores a sewing needle 5 in a space area A (see FIG. 7) formed between the rear surface of the clamping member 6 and the rear surface of the guide member 8 when performing root winding sewing. The drive of each motor is controlled so that it is dropped (for example, point P in FIG. 7).
The power switch 104 is an ON / OFF switch for energizing the root winding button sewing machine 1. The start pedal 105 is a pedal that is operated when sewing is started, and when this is operated, sewing is started under the control of the CPU 102. The temporary stop switch 106 is a switch for temporarily stopping after starting sewing.

Further, an interface (not shown) is provided in the electrical box 101, and a control signal from the CPU 102 is output to each drive source via the interface and a drive circuit (not shown).
That is, the spindle motor 14, the needle swing motor 20, the upper Y feed motor 32, the vertical drive motor 35, the differential motor 72, and the frame 21 are approximately connected to the needle bar 9 in the vertical movement direction and the needle swing direction via the interface. A lower Y-feed motor 51 that drives in the front-rear direction, which is an orthogonal direction, and an upper Y-feed motor 32 that moves the button holding arm 34 in the front-rear direction are connected. Further, the electromagnetic valve 108 is connected through an interface, and the rotary cylinder 37, the tongue cylinder 582, and the presser foot cylinder 552 are connected through the electromagnetic valve 108. Further, the root winding button sewing machine 1 is provided with a thread trimming mechanism (not shown) so that the thread is cut at a predetermined timing during or after sewing. A cutting cylinder 110 is provided.

The root winding button sewing machine 1 having the above configuration moves the button B in the X-axis direction by driving the differential motor 72 and moves in the Y-axis direction by driving the upper Y-feed motor 32. The Z-axis direction can be performed by driving the vertical drive motor 35.
Further, the cloth W can be moved in the Y direction together with the frame 21 by driving the lower Y feed motor 51. In addition, the needle drop position of the sewing needle 5 can be positioned in the X-axis direction by driving the needle swing motor 20 that swings the needle bar 9 in the X-axis direction.
That is, the needle swing motor 20, the upper Y feed motor 32, the differential motor 72, and the lower Y feed motor 51 cooperate to form the button B held by the button holding arm 34 and the cloth W held by the tongue 57. On the other hand, the needle drop position of the sewing needle 5 is relatively positioned. The lower Y feed motor 51 can also retract the tongue 57 from the sewing needle 5.

<Buttoning method with sewing machine with root winding button>
Next, a method of buttoning the cloth W by the root winding button sewing machine 1 will be described.
FIG. 6 is a flowchart of a buttoning method on the cloth W by the root winding button sewing machine 1, and FIG. 7 is a diagram illustrating a method of holding the cloth W by the holding portion 57 a of the tongue 57 and passing the sewing needle 5 through the holding portion 57 a of the tongue 57. 8 is a plan view when approaching the line, and FIG. 8 is a view of FIG. 7 when the cloth W is held by the holding part 57a of the tongue 57 and the holding part 57a of the tongue 57 is brought close to the passing line of the sewing needle 5. It is VIII-VIII sectional drawing in.

As shown in FIG. 6, when buttoning the button B with the root winding buttoning sewing machine 1, the guide member 8 is attached to the holding member 6 and the operation panel 103 is used to perform root winding sewing using the guide member. A guide member use mode is set (step S1: attachment step).
Next, the electrical box 101 rotates the tongue 57 holding the cloth W folded back by the holding portion 57a by driving the tongue cylinder 582 so that the holding portion 57a of the tongue 57 approaches the passage line of the sewing needle 5 (step). S2: Set step).
Next, the electrical box 101 moves the button B held by the chuck mechanism 34 a of the button holding arm 34 to a predetermined position, drives each motor by the electrical box 101, performs rake sewing, and sews the button B to the cloth W. (Step S3: Rake sewing step).

  Next, when the rake stitching is completed, the electrical box 101 drives the button holding arm 34 to rotate the button B sewn on the cloth W by 90 degrees so that the upper surface thereof faces the rear of the frame 21 (step S4: button). Rotation step). As a result, the button B is in an upright state, and the button B and the cloth W are held vertically as shown in FIGS.

  Further, the upper Y feed motor 32 is driven based on the button height H set in advance by the operation panel 103, and the button B is moved to the button height H so that the distance from the button B to be cloth W becomes the button height H. Move in the direction (step S5: root winding length setting step). At this time, since the thread T is pulled to the button B side, the cloth W sewn with the thread T is also pulled to the button B side, but the cloth W is pulled to the button B side by the clamping member 6 and the guide member 8. Only the cloth W facing the threading portion 82 is slightly pulled toward the button B side.

  Next, it is determined whether or not a guide use mode for performing buttoning using the guide member 8 is set by the operation panel 103 (step S6: guide mode determination step). When the guide use mode is set, the upper Y feed motor 32 and the lower Y feed motor 51 are driven synchronously, and the button B and the cloth W are moved in the same distance Y direction to start the sewing start position P (see FIG. 7) (step S7: guide member use mode positioning step). The sewing start position P is a sewing start position of the button B and the cloth W with respect to the sewing needle 5 when the root winding sewing is performed using the guide member 8, and the guide member 8 shown by the sewing needle 5 'in FIG. Compared to the position of the needle when sewing the root winding without using the needle, the plate thickness t of the guide member 8 is relatively closer to the button side, and this length t is stored in the memory 102a in advance. Yes.

  Next, the CPU 102 calculates the number N of root winding sewing needles based on the button height H. The number N of the neckline stitches is the number of stitches calculated from the button height H and the stitching pitch M of the neckline stitches stored in the memory 102a in advance. When the guide member use mode is set Is calculated by an arithmetic expression (N = (H−t) / M) in which a value obtained by subtracting the sheet thickness t from the button height H is divided by the sewing pitch M (step S8: stitch number calculating step).

Then, the electrical box 101 executes the drive control program, thereby controlling the driving of each motor and dropping the sewing needle 5 to the point P in the space area A to start root winding sewing (step S9: root winding step). ). At the time of the root winding sewing, the control box 101 keeps the root thread T spanned between the button holding arm 34 and the tongue 57 in a straight line along the direction substantially perpendicular to the needle swinging direction of the sewing needle 5. The upper Y feed motor 32 and the lower Y feed motor 51 are synchronously driven so as to move back and forth on the passing line of the sewing needle 5.
Next, it is determined whether or not the number of stitches that have been neck-wrapped has reached the calculated number of stitches N (step S10: step of determining the end of root-wrapping). Then, the thread trimming cylinder 110 is driven to cut the root winding thread and finish the root winding sewing.
With this, the buttoning on the cloth W by using the guide member 8 is completed. The sewing start position P is not limited to the above-described example, and it is preferable that the sewing start position P be as close as possible to the rear surface of the guide member 8 within a range where interference between the guide member 8 and the sewing needle 5 can be prevented.

On the other hand, if the guide member use mode is not set in step S6, the upper Y feed motor 32 and the lower Y feed motor 51 are driven synchronously to move the button B and the cloth W in the same distance Y direction. Positioning is performed at the sewing start position S (see FIG. 10) (step S11: guide member non-use mode positioning step).
Next, the CPU 102 calculates the number N of root winding stitches based on the button height H. In this case, the number N of the neckline sewing needles is calculated by dividing the button height H by the sewing pitch M, and therefore is calculated by an equation of N = H / M (step S12: needle number calculation). Step).
Next, the process proceeds to step S9, the same process as in the guide member use mode is performed, and the buttoning on the cloth W when the guide member 8 is not used is finished.

  As described above, when the guide member 8 is attached, if the needle is dropped near the cloth W as in the case of the cloth W that does not need to be attached and is not easily stretched, the guide member 8 and the guide member 8 are sewn. Although the interference with the needle 5 is prevented, the drive control program of the control box 101 forms the root winding stitch from the position away from the cloth W by the thickness t of the guide member 8 to the vicinity of the button B. As described above, it is possible to form a high-quality root-wrap stitch for the cloth W that is relatively easy to stretch while preventing interference between the guide member 8 and the sewing needle 5 in order to control each drive member.

<Effects of Embodiment>
According to the buttoning method using the root winding button sewing machine 1 and the root winding button attachment sewing machine 1 in the embodiment, the cloth W can be held while the guide member 8 faces the holding portion 57a, and the root thread T can be inserted. The guide member 8 is arranged at an interval that forms the threading portions 82 that are narrower than a predetermined swinging width, so that the guide member 8 can move the holding portion 57a of the tongue 57 closer to the passing line of the sewing needle 5. Opposite to 57a. As a result, the guide member 8 functions as the holding member 6 that holds the cloth W with the holding portion 57 a and covers the opening 62 formed in the holding member 6. Further, since a threading portion 82 having a width smaller than the amplitude of the sewing needle 5 is formed between the guide members 8, the button B is sewed on a cloth W that is relatively easy to stretch like knit. Even when the cloth W is pulled by the tensile force applied when the root thread T is maintained in a straight line during winding sewing, the portion where the cloth W is pulled by the clamping member 6 and the guide member 8 is significantly reduced. It is possible to prevent the fabric W from being lifted when winding and sewing.

  Further, the control device 101 controls each driving device so that the sewing needle 5 is dropped on both sides of the guide member 8 of the root thread T from the side of the button side to the vicinity of the button, and the root thread T Form. Accordingly, interference between the sewing needle 5 and the guide member 8 can be avoided, and the needle drop position at the time of root winding sewing can be brought close to the cloth W, so that the root winding failure does not occur.

  Therefore, the guide member 8 can suppress the stretch of the cloth W when performing the root winding sewing, and the root thread T can be formed on the root thread T without forming the seam of the root winding sewing on the cloth W. Thus, even when the button B is attached to the cloth W that is relatively easy to stretch and the root winding sewing is performed, it is possible to prevent the quality of the sewing product from being deteriorated.

The present invention is not limited to the above embodiment. For example, the clamping member 6 is not necessarily formed integrally, and a pair of members may be arranged so as to be wider than the swing width of the sewing needle 5. Similarly, the guide member 8 is not necessarily formed integrally, and a pair of members may be arranged to be narrower than the swing width of the sewing needle 5.
In the above embodiment, the frame 21 and the button holding member 34 are driven by separate drive sources. However, the frame 21 and the button holding member 34 may be operated by the same drive source.
In other words, in the above embodiment, the button holding arm 34 and the frame 21 are driven by the upper Y feed motor 32 and the lower Y feed motor 51 to move and position in the front-rear direction. Needless to say, both the frame 34 and the frame 21 may be driven by the upper Y-feed motor 32.
In the above embodiment, when the guide member use mode is selected by the operation panel 103, the cloth W and the button P are automatically positioned at the sewing start position P in the guide member use mode. Of course, a sewing start position setting switch may be provided on the operation panel 103 without setting the mode, and the sewing start position P may be set by the sewing start position setting switch. In this case, the number N of the root winding sewing needles is determined based on the standard sewing start position S when the root winding sewing is performed without using the guide member 8 and the sewing start position P set by the sewing start position setting switch. The CPU 102 executes and obtains an operation for dividing the distance obtained by subtracting the difference from the button height H by the sewing pitch M.

It is a block diagram of a sewing machine with a root winding button. It is a perspective view of a guide member periphery in which a root winding sewing is performed. It is a perspective view of a guide member periphery in which a root winding sewing is performed. It is a perspective view of a guide member periphery in which a root winding sewing is performed. It is an expansion perspective view of a clamping member and a guide member. It is a flowchart of a button attaching method. It is a top view of the clamping member and guide member at the time of performing a root winding sewing. It is VIII-VIII sectional drawing in FIG. It is a perspective view of the guide member periphery in which the root winding sewing in the conventional root winding button sewing machine is performed. It is a top view of the clamping member and guide member at the time of performing the root winding sewing in the conventional root winding button sewing machine. It is XI-XI sectional drawing in FIG. It is a side view which shows the state of a button and cloth when root winding sewing is performed with the conventional root winding button attaching sewing machine.

Explanation of symbols

1 Sewing machine with root winding button 5 Sewing needle 9 Needle bar 14 Spindle motor (needle bar drive)
20 Needle swing motor (needle swing drive device)
40 Needle plate 51 Lower Y feed motor (button holding member driving device)
57 tongue (cloth holding member)
57a Holding portion 6 Holding member 62 Opening portion 8 Guide member 82 Threading portion 101 Electrical box (control device)
B Button T Root thread W Cloth

Claims (2)

A needle plate having a needle hole for inserting a sewing needle;
A looper which is provided below the needle plate and forms a seam of a chain stitch by cooperating with a sewing needle;
A needle bar drive device that moves the needle bar holding the sewing needle up and down;
A button holding member that is arranged between the needle bar and the needle plate and holds a button sewn on a cloth with a root thread in a vertical state;
A button holding member driving device for moving the button holding member back and forth;
A needle swing driving device that swings the needle bar and causes the sewing needle to drop on both sides of the root thread with a predetermined swing width;
A support base that moves back and forth with the button holding member;
A root yarn that has a holding portion that holds the cloth in a state of being folded at the knot portion of the root yarn, and is spanned between the cloth held by the holding portion and the button held by the button holding member; A cloth holder that is supported by the support base and moves back and forth on the needle plate so as to be positioned on a passing line of the sewing needle while maintaining a straight line along a direction substantially orthogonal to the needle swinging direction of the sewing needle A member,
It is arranged on both sides of the route of the root thread from the cloth held by the cloth holding member to the button so that the root thread can be inserted, and extends upward from the support base so as to face the holding portion. A pair of clamping members for clamping the cloth between the holding part;
A control device for controlling the drive of each of the drive devices,
Both of the pair of clamping members are arranged at an interval that forms an opening wider than the predetermined swing width so as to allow needle drop between the both clamping members and to both sides of the root yarn nearest to the cloth. And controlling each of the driving devices to cause the sewing needle to fall between the both clamping members of the root thread and on both sides of the root thread from the side closest to the cloth to the vicinity of the button. In the root winding button sewing machine that forms the root winding seam,
The opening is detachably provided in the opening, and is disposed at an interval that forms a threading portion that is capable of inserting the root thread and having an interval narrower than the predetermined swinging width while sandwiching a cloth facing the holding portion. A pair of guide members
The control device controls each of the driving devices so that the sewing needle is dropped on both sides of the root thread from the button-side side surface of the pair of guide members to the vicinity of the button, thereby winding the root thread around the root thread. Neck winding button sewing machine characterized by forming seams. In the buttoning method using the root winding button sewing machine according to claim 1,
When performing root winding sewing, the control device controls the driving devices so that the sewing needle is dropped on both sides of the root thread from the closest side to the button side of the pair of guide members of the pair of guide members. And a control step for forming a root seam on the root thread.

Images