JP2007090052A - Cloth cutting device of eyelet buttonholing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To elongate the service life of a component for vertically moving a hammer manually. <P>SOLUTION: This cloth cutting device is provided with a knife fixed to a frame 1a, a hammer support body 9 fixed to the frame 1a, a hammer support shaft 10 vertically movably supported to the hammer support body 9, and the hammer 12 attached to the lower end of the hammer support shaft 10. The upper part of the hammer support shaft 10 is attached with a link connection body 13. The inside of the hammer support shaft 10 is disposed with a tension coil spring 37, and the link connection body 13 and the hammer support shaft 10 are connected via the coil spring 37. The driving force of an air cylinder 14 is transmitted to the link connection body 13 via a link mechanism 16, so that the hammer support shaft 10 and the link connection body 13 are integrally vertically moved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  [Technical Field] The present invention relates to a cloth cutting device for an eyelet-operated sewing machine that forms an eyelet hole by the cooperation of a hammer and a knife.

  The eyelet sewing machine (button hole) is formed on the inside of the hole stitching seam after forming the hole seam on the work cloth, or before the formation, or the inside of the portion to be formed. Some are equipped with a cloth cutting device for opening. For example, Japanese Patent Application Laid-Open No. 2005-95302 describes a cloth cutting device for the eyelet sewing machine as follows.

  That is, the cloth cutting device includes a knife fixed to the frame of the bed portion of the sewing machine, a shaft member supported by the frame of the arm portion so as to be movable up and down, a hammer fixed to the lower end portion of the shaft member, An air cylinder for moving the shaft member up and down, a transmission mechanism for transmitting the driving force of the air cylinder to the shaft member, and the like are provided.

  The transmission mechanism includes a first link member having one end connected to a tip of a piston rod of the air cylinder, a second link member having one end connected to an upper end of the shaft member, and the first and first links. It is comprised from the intermediate link member which connects the other end part of 2 link members. The other end portion of the first link member has a bifurcated shape, and a connecting pin is supported on the bifurcated portion. The intermediate link member has an oval escape hole, and the connecting pin is loosely inserted into the escape hole. Further, a tension coil spring is stretched between one end portion of the second link member and the sewing machine frame, and one end portion of the second link member is urged upward by the coil spring.

As described above, since the connecting pin of the first link member is movable in the clearance hole of the intermediate link member, the intermediate link member and the second link member are operated even if the first link member is not operated, thereby the shaft member. Can be moved up and down. For this reason, when the boring stitch formation process has been executed in a state where the sewing thread is cut halfway, the shaft member is manually pushed down to the lower cutting position without operating the air cylinder, and the work cloth After alignment, the hole seam can be re-formed.
JP 2005-95302 A

  By the way, the cloth cutting device operates as follows when a normal eyelet hole is formed. That is, when the shaft member in the upper standby position is pushed down to the lower cutting position, the piston rod in the advanced state is driven to retreat and the first link member is rotated. The second link member is rotated against the urging force of the tension coil spring. On the other hand, when pulling up the shaft member in the cutting position to the upper standby position, the piston rod in the retracted state is driven to advance, the first link member rotates and the second link member pulls the elastic force of the coil spring. And the intermediate link member is returned to its original position.

  Thus, in the cloth cutting device, the piston rod is driven forward and backward to drive the shaft member up and down, and whenever an eyelet hole is formed, an external force acts on the tension coil spring to expand and contract. That is, there is a problem that a load on the tension coil spring is large and the tension coil spring is damaged relatively early.

  Accordingly, an object of the present invention is to provide a cloth cutting device for an eyelet sewing machine capable of extending the life of parts for manually moving a hammer up and down.

  The present invention provides a combination of a knife fixed to a sewing machine frame and a hammer connected to the lower end of a hammer support shaft that is provided on the sewing machine frame and can be moved up and down by an actuator. A drive force receiving member that is movable with respect to the hammer support shaft and that transmits the drive force of the actuator to the hammer support shaft, in a cloth cutting device for a punched hole sewing machine that forms a eyelet hole in the work cloth before forming; One end is fixed to the hammer support shaft, the other end is fixed to the driving force receiving member, and a coupling elastic member is provided to connect the hammer supporting shaft and the driving force receiving member by an urging force. It is characterized by that.

  According to the above configuration, when the driving force of the actuator is transmitted to the driving force receiving member, the driving force receiving member and the hammer support shaft connected by the connecting elastic member move up and down integrally. On the other hand, when the actuator is stopped, only the hammer support shaft can be pulled down by applying a downward force against the elastic force of the connecting elastic member to the hammer support shaft.

  According to the present invention, the drive force receiving member and the hammer support can be supported without changing the state of the elastic member for connection during normal operation of forming the eyelet hole in the work cloth after or before the formation of the hole stitch. Since it is configured to move up and down integrally with the shaft and external force is applied to the connecting elastic member only in the event of an abnormality such as the thread being cut off during the sewing of the boring seam, the life of the connecting elastic member is extended. can do.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows an eyelet sewing machine 1 according to this embodiment. The sewing machine 1 includes a bed 2, an arm 3, and a pedestal 4. A knife base 5 is fixed on a frame 1 a (corresponding to a sewing machine frame) of the bed portion 2, and a knife 6 is fixed to the knife base 5. The bed portion 2 is provided with a needle plate 7. The upper end of the knife 6 and the upper surface of the needle plate 7 are configured to have substantially the same height position.

  A hammer support mechanism 8 is provided below the arm portion 3. The hammer support mechanism 8 is attached to a substantially cylindrical hammer support 9, a hollow hammer support shaft 10 slidably supported by the hammer support 9 in the vertical direction, and a lower end portion of the hammer support shaft 10. A hammer connection body 11, a hammer 12 removably attached to the lower end of the hammer connection body 11, a link connection body 13 (corresponding to a driving force receiving member) attached to the upper end of the hammer support shaft 10, and the like. ing. The hammer 12 and the knife 6 are configured to face each other in the vertical direction. The detailed configuration of the hammer support mechanism 8 will be described later.

  An air cylinder 14 as an actuator is disposed in the lower part of the pedestal 4. The air cylinder 14 is rotatably supported by the frame 1a by a pin 15 at a lower end portion thereof. The air cylinder 14 has a piston rod 14a protruding upward from its upper end. When the air cylinder 14 is driven, the piston rod 14a advances and retracts from the air cylinder 14.

  A link mechanism 16 serving as a transmission mechanism for transmitting the driving force of the air cylinder 14 to the hammer support shaft 10 is disposed in the arm portion 3. As shown in FIGS. 1 and 2, the link mechanism 16 includes first and second link members 17 and 18 and an intermediate link member 19. The first link member 17 includes a support portion 17a extending in the front-rear direction, a drive arm portion 17b extending rightward from the rear end of the support portion 17a, and a connecting arm portion 17c extending leftward from the front end of the support portion 17a. It consists of and. The support portion 17a is rotatably supported by the frame 1a via a support shaft 20 extending in the front-rear direction. The front end of the drive arm portion 17b has a bifurcated shape, and is rotatably connected to a connecting portion 14b at the front end of the piston rod 14a via a pin 21.

The second link member 18 includes a central support portion 18a, and a pressing arm portion 18b and a connecting arm portion 18c located on the left and right sides of the support portion 18a. The support portion 18a is rotatably supported by the frame 1a via a support shaft 22 extending in the front-rear direction. The ends of the pressing arm portion 18b and the connecting arm portion 18c are bifurcated. A pressing roller 23 is supported via a support shaft 24 at the bifurcated portion at the tip of the pressing arm portion 18b. The pressing roller 23 is connected to a link connecting body 13 located on the upper portion of the hammer support shaft 10.
The intermediate link member 19 is connected to the distal end of the connecting arm portion 17c of the first link member 17 and the distal end of the connecting arm portion 18c of the second link member 18 via connecting pins 25 and 26, respectively.

  In the above configuration, when the piston rod 14a is driven to advance, the link members 17, 18, and 19 rotate to push down the hammer support shaft 10, and as a result, the female receiver at the lower end of the hammer 12 is moved. The surface 12 b is pressed against the upper end of the knife 6. Accordingly, the cloth cutting device 27 is constituted by the knife 6, the hammer support mechanism 8, the hammer 12, the air cylinder 14, the link mechanism 16, and the like.

Next, the configuration of the hammer support mechanism 8 will be described with reference to FIGS.
A circular mounting hole 1b is formed in the lower frame 1a of the arm portion 3, and the hammer support 9 is fitted in the mounting hole 1b. The hammer support 9 has a large-diameter portion 9a having a large outer diameter, a small-diameter portion 9b having a small outer-diameter size located below the large-diameter portion 9a, and an outer periphery of a boundary portion between the large-diameter portion 9a and the small-diameter portion 9b And a mounting flange portion 9c. The hammer support 9 has a large-diameter portion 9a inserted into the mounting hole 1b from below, the mounting flange portion 9c is brought into contact with the lower surface of the frame 1a, and the mounting flange portion 9c and the frame 1a are fastened by a plurality of bolts 28. By doing so, it is fixed to the frame 1a. An annular oil seal 29 is provided at the lower end of the peripheral edge of the mounting hole 1b of the frame 1a. The oil seal 29 prevents the lubricating oil used in the eyelet sewing machine 1 from falling downward from between the frame 1 a and the hammer support 9.

The hammer support 9 has a hole 30 that penetrates the large diameter portion 9a and the small diameter portion 9b in the vertical direction, and the hammer support shaft 10 is slidably inserted in the hole 30 in the vertical direction. Has been. An annular groove 30a serving as an oil reservoir is formed at the center in the vertical direction of the inner peripheral surface (sliding surface) of the hole 30.
The hammer support shaft 10 has a through hole 10a extending vertically. In addition, a rectangular parallelepiped connecting portion 31 is integrally provided at the lower end portion of the hammer support shaft 10. The width dimension of the connecting part 31 is set larger than the inner diameter dimension of the hole part 30. The hammer support shaft 10 is inserted into the hole 30 from below, and the upward movement of the hammer support shaft 10 is restricted by the connecting portion 31.

  The hammer connecting body 11 is detachably fixed to the connecting portion 31 by, for example, four screws 32. A positioning pin 33 is provided at the lower right of the front surface of the hammer connector 11. A lever 35 is provided in the center of the front surface of the hammer connector 11 via an adjustment screw 34. A hook portion 35 a is formed at the lower end portion of the lever 35. On the other hand, an engagement groove 12 a is formed on the front surface of the hammer 12, and a knife receiving surface 12 b is formed on the lower end portion of the hammer 12. The hammer 12 has its upper end abutted against the lower end of the hammer coupling body 11 and its right end surface abutted against the positioning pin 33 so that the hook portion 35a is engaged with the engagement groove 12a, thereby adjusting screw. By tightening 34, it is attached to the hammer connector 11. Further, by loosening the adjusting screw 34, the hook portion 35a is separated from the engaging groove 12a, and the hammer 12 can be removed from the hammer connector 11.

The link connector 13 is attached to the upper end portion of the hammer support shaft 10. The link connecting body 13 extends upward from a shaft portion 13a inserted into the hole 30, a rectangular plate-shaped pressing surface portion 13b provided at the upper end of the shaft portion 13a, and a left end portion of the pressing surface portion 13b. It is comprised from the L-shaped locking piece part 13c which has an opposing surface with the said press surface part 13b. The pressing roller 23 of the pressing arm portion 18b is disposed between the pressing surface portion 13b and the locking piece portion 13c.
A pair of convex portions 36 are provided on the front and rear portions of the upper end portion of the hammer support shaft 10. The pressing surface portion 13 b of the link connector 13 is disposed between the convex portions 36. With such a configuration, the link connecting body 13 is positioned and prevented from rotating with respect to the hammer support shaft 10 during assembly.

  A tension coil spring 37 (corresponding to a connecting elastic member) is disposed in the hole 30. A notch 38 is provided in the lower part of the shaft portion 13 a of the link connecting body 13, and a pin 39 is inserted through the notch 38. On the other hand, a pin 40 that passes through the hole 30 in the radial direction is inserted into the lower part of the hole 30. An upper end portion of the tension coil spring 37 is disposed in the notch 38 and is locked to the pin 39, and a lower end portion of the tension coil spring 37 is locked to the pin 40. With the above configuration, the link coupling body 13 is coupled to the hammer support shaft 10 by the tension coil spring 37. In this case, the link coupling body 13 is urged toward the hammer support shaft 10 by the elastic force of the tension coil spring 37, and the pressing surface portion 13 b comes into close contact with the upper end of the hammer support shaft 10.

  Further, a part of the outer periphery of the lower half of the hammer support shaft 10 (left part in FIG. 6) is chamfered to form a flat surface part 41. The flat surface portion 41 is continuous with one side surface of the connecting portion 31. On the other hand, a flat surface portion 42 corresponding to the flat surface portion 41 is formed on a part of the outer periphery of the small diameter portion 9b of the hammer support 9 (left portion in FIG. 6). A concave portion 43 extending in parallel with the flat surface portion 42 is formed at the lower portion of the small diameter portion 9b, and a wall portion 44 is formed at the left end portion of the lower portion of the small diameter portion 9b by the concave portion 43. That is, the flat surface portion 42 corresponds to the left end surface of the wall portion 44. A pair of front and rear screw holes 45 are formed in the wall portion 44. A screw 47 is screwed into the screw hole 45 via a nut 46.

Further, attachment step portions 48 are provided on portions of the lower surface of the attachment flange portion 9c located at the front and rear portions of the recess 43, respectively. Each mounting step 48 is formed with a screw hole 49. A straight line connecting the centers of the screw holes 49 is configured to be slightly displaced from the recess 43.
A rotation stop plate 50 is disposed in the recess 43. The anti-rotation plate 50 includes a pressing surface portion 50 a that presses the flat surface portion 41 of the hammer support shaft 10, and a mounting portion that is positioned at both ends of the pressing surface portion 50 a and is fixed to the screw hole 49 of the mounting step portion 48 by screws 51. 50b. Corresponding to the mounting step portion 48, a step is provided between the upper surface of the mounting portion 50b and the upper surface of the pressing surface portion 50a, whereby the rotation stopper plate 50 disposed in the concave portion 43 is provided. The movement in the front-rear direction is restricted.

  When the hammer support shaft 10 is inserted into the hole of the hammer support 9 from below, the flat surface portion 41 is opposed to the wall portion 44. Then, the rotation stopper plate 50 is disposed in the concave portion 43 and fixed with the screw 51, and the rotation stopper plate 50 is pressed by the tip of the screw 47 screwed into the screw hole 45 of the wall portion 44. At this time, by appropriately adjusting the tightening condition of the screw 51 and the screwing condition of the screw 47, the hammer support shaft 10 is slidable in the vertical direction in the hole 30 of the hammer support body 9 and is not rotatable. Adjusted to. That is, the flat surface portion 41, the wall portion 44, the recessed portion 43, the screw 47, the anti-rotation plate 50, etc. constitute the anti-rotation mechanism 52.

  As described above, since the anti-rotation plate 50 is disposed between the wall portion 44 and the flat surface portion 41 and the anti-rotation plate 50 is backed up by the wall portion 44, the hammer support shaft 10 tries to rotate. Even when a force is applied to the rotation stop plate 50, it is possible to prevent the rotation stop plate 50 from being deformed and causing rattling or damage to the hammer support shaft 10 as much as possible. Therefore, the rotation preventing mechanism 52 can reliably prevent the hammer support shaft 10 from rotating. In particular, since the straight line connecting the centers of the screw holes 49 of the mounting step portion 48 is slightly deviated from the concave portion 43, the force acting on the pressing surface portion 50 a of the rotation stopper plate 50 hardly reaches the screw 51. For this reason, it can also prevent that the screw 51 screwed in the screw hole 49 is loosened and the occurrence of rattling.

  Moreover, since the anti-rotation plate 50 is attached to a portion of the hammer support 9 that is located below the frame 1a, the screw 47 is applied when the anti-rotation plate 50 is deformed and rattling occurs between the flat surface portion 41. , 51 can be easily tightened, and when the detent plate 50 is damaged, the detent plate 50 can be replaced easily.

  In addition, a screw hole 53 that penetrates the support shaft 10 in the radial direction and reaches the hole portion 30 is provided in the upper portion of the hammer support shaft 10. On the other hand, a concave portion 54 corresponding to the screw hole 53 is provided in the shaft portion 13 a of the link connector 13. Normally, nothing is inserted through the screw hole 53, and when the tension coil spring 37 is damaged, a screw 55 as a fixing metal fitting is screwed (see FIG. 55 shows a state of being screwed). The tip end of the screw 55 screwed into the screw hole 53 is located in the recess 54, whereby the link connector 13 is fixed to the hammer support shaft 10.

Next, the operation of the above configuration will be described.
FIG. 1 shows a state where the piston rod 14a of the air cylinder 14 is in the advanced state and the hammer support shaft 10 is located at the raised standby position. In this state, the operator positions the work cloth W after or before forming the hole seam at a predetermined position on the needle plate 7. When the air cylinder 14 is driven and the piston rod 14a is retracted in the direction of the arrow P1, the first link member 17 rotates clockwise about the support shaft 20 (the direction indicated by the arrow P2 in FIG. 1). To do. Then, the second link member 18 rotates counterclockwise about the support shaft 22 (the direction indicated by the arrow P3 in FIG. 1) via the intermediate link member 19, and the pressing arm portion 18b of the second link member 18 is moved. The pressing surface portion 13 b of the link coupling body 13 is pressed via the pressing roller 23. As a result, the hammer support shaft 10 is pushed down to the lower cutting position integrally with the link coupling body 13 and the state shown in FIG. 9 is obtained. As a result, the work cloth W is pressed against the knife 6 by the hammer 12, and an eyelet hole is formed inside the hole seam or the formation target portion of the hole seam of the work cloth W.

Here, when the first link member 17 rotates clockwise around the support shaft 20 by the retraction of the piston rod 14a of the air cylinder 14, the center X of the support shaft 20, the center Y of the connecting pin 25, A triangle is formed from the center Z of the connecting pin 26. A toggle mechanism (a so-called boost mechanism) is configured by the triangle.
For this reason, when the first link member 17 is rotated clockwise, the opening angle α between the side XY made up of X and Y and the side YZ made up of Y and Z increases, and the connecting pin 26 is moved. Push up. This pushing-up force is a torque larger than the driving force when the piston rod 14a is driven to retract. Accordingly, even if the air cylinder 14 is small, the hammer 12 can generate a cutting force (for example, a cutting force of 8 KN) necessary for forming the eyelet hole.

  On the other hand, as shown in FIG. 9, the piston rod 14a of the air cylinder 14 advances in the direction of arrow P4 when the piston rod 14a is in the retracted state and the hammer support shaft 10 is located at the lowered cutting position. When operated, the first link member 17 rotates counterclockwise (the direction indicated by the arrow P5 in FIG. 9). As a result, the second link member 18 rotates clockwise (in the direction indicated by the arrow P6 in FIG. 9) via the intermediate link member 19 and the pressing arm portion 18b of the second link member 18 rises, and the pressing roller 23 The hammer support shaft 10 is pulled up to the upper standby position via the locking piece 13c that is locked to the state shown in FIG.

  By the way, when the process is executed in a state where the thread is cut during the sewing process of the hole stitch, the operator pushes down the hammer support shaft 10 to the lower cutting position and performs the alignment. It is necessary to re-sew the hole seam. In this case, since the air cylinder 14 is in a stopped state, the operator moves the hammer support shaft 10 at the upper standby position downward by manual operation with the end of the process. That is, as shown in FIG. 10, the operator applies a force in the direction indicated by the arrow P <b> 7 to the hammer support shaft 10, and moves the hammer support shaft 10 downward against the elastic force of the tension coil spring 37. Thereby, the hammer 12 can be pressed against the predetermined position of the work cloth W, and alignment can be performed. Further, after the alignment, the force applied to the hammer support shaft 10 is released, whereby the hammer support shaft 10 is pulled up by the elastic force of the tension coil spring 37 and returned to the standby position. That is, the hammer support shaft 10 can be lowered or raised regardless of the operation of the air cylinder 14 or the link mechanism 16.

  As described above, according to this embodiment, the link coupling body 13 is provided on the hammer support shaft 10 and the link coupling body 13 and the hammer support shaft 10 are coupled by the tension coil spring 37. When the air cylinder 14 is driven and the piston rod 14a moves back and forth, the hammer support shaft 10 and the link connector 13 move up and down integrally without changing the expansion / contraction state of the tension coil spring 37. When the air cylinder 14 is stopped, by applying a downward force to the hammer support shaft 10, only the hammer support shaft 10 moves downward against the elastic force of the tension coil spring 37. It was configured as follows. Therefore, during the normal eyelet hole forming operation, no external force acts on the tension coil spring 37, so that the load on the tension coil spring 37 can be reduced and the life of the tension coil spring 37 can be extended.

  By the way, when the tension coil spring 37 is broken, the connection between the hammer support shaft 10 and the link connecting body 13 is released, so that the driving force of the air cylinder 14 transmitted to the link connecting body 13 is supported by the hammer. It is not transmitted to the shaft 10. On the other hand, in the present embodiment, the link connector 13 can be fixed to the hammer support shaft 10 by screwing screws 55 into the screw holes 53. Therefore, even if the tension coil spring 37 is damaged, the hammer support shaft 10 and the link connector 13 can be quickly connected with the screw 55, so that the eyelet hole forming operation can be continued. .

  Further, in the present embodiment, the link connecting body 13 is provided with the pressing surface portion 13b and the locking piece portion 13c. When the pressing arm portion 18b of the second link member 18 that is the output side end portion of the link mechanism 16 rotates downward, the pressing surface portion 13b is pressed by the pressing roller 23, and the pressing arm portion 18b is moved upward. When rotating, the hammer support shaft 10 is configured to rise through the locking piece 13c locked to the pressing roller 23. Therefore, the vertical movement of the pressing arm portion 18 b by the air cylinder 14 can be reliably transmitted to the hammer support shaft 10.

  FIG. 11 and FIG. 12 show a second embodiment of the present invention, and different points from the first embodiment will be described. The second embodiment is different from the first embodiment in the configuration of the detent mechanism 52. Specifically, instead of the rotation stop plate 50, the rotation stop plate 61 comes into contact with the flat surface portion 41 of the hammer support shaft 10. The detent plate 61 includes a pressing surface portion 61a that presses the flat surface portion 41 of the hammer support shaft 10, mounting portions 61b that are positioned at both ends of the pressing surface portion 61a, and an mounting portion that is positioned at the longitudinal center of the pressing surface portion 61a. 61c. A recess 62 is provided on the lower surface of the small diameter portion 9 b of the hammer support 9, and the rotation stop plate 61 is disposed in the recess 62. An attachment step portion (not shown) corresponding to the attachment portion 61b is provided in the recess 62, and between the upper surface of the attachment portion 61b and the upper surface of the pressing surface portion 61a corresponding to the attachment step portion. A step is provided. Thereby, the movement of the rotation stop plate 61 arranged in the recess 62 is restricted. The rotation stopper plate 61 disposed in the recess 62 is fixed with a screw 63 via attachment portions 61b and 61c.

  In this embodiment, the wall portion 44 that backs up the rotation stop plate 61 is not provided in the lower portion of the small diameter portion 9b. However, the support shaft 10 is rotated by fixing the rotation stop plate 61 with three screws 63. When a force to move is applied to the rotation stop plate 61, the rotation stop plate 61 can be prevented from being deformed or damaged.

  FIG. 13 and FIG. 14 show a third embodiment of the present invention, and different points from the first embodiment will be described. In the third embodiment, the configurations of the hammer support shaft 10 and the link connector 13 are different from those of the first embodiment.

  Specifically, the hammer support shaft 10 of this embodiment has a large hole portion 101 and a small hole portion 102 instead of the through hole 10a. A groove portion 103 is provided on the left side of the outer peripheral surface of the hammer support shaft 10. The large hole portion 101 is located at the upper end portion of the hammer support shaft 10, and the small hole portion 102 extends downward from the right portion of the bottom surface of the large hole portion 101. The lower end portion of the small hole portion 102 is located near the center in the vertical direction of the hammer support shaft 10.

The groove 103 extends from the upper end of the hammer support shaft 10 to a portion slightly above the lower end. The upper end portion of the groove portion 103 is connected to the hole portion 101. A step portion 104 is provided at the lower end portion of the groove portion 103, and the left side surface of the step portion 104 is an attachment surface 104a.
The link coupling body 13 includes an attachment portion 105 disposed in the large hole portion 101, a shaft portion 106 inserted into the small hole portion 102, a pressing surface portion 13b located on the upper portion of the attachment portion 105, and a locking piece portion 13c. . The left part of the mounting part 105 is located in the groove part 103. The length of the shaft portion 106 is shorter than the length (depth) of the small hole portion 102.

The link connector 13 and the hammer support shaft 10 are connected by a tension coil spring 107 disposed in the groove 103. Specifically, the shaft portion 106 of the link connector 13 is inserted into the small hole portion 102, and the attachment portion 105 is disposed in the large hole portion 101. The upper end portion of the tension coil spring 107 is fixed to the left surface of the mounting portion 105, and the lower end portion of the tension coil spring 107 is fixed to the mounting surface 104a with screws 108 and 109, respectively.
Thus, also in this embodiment, since the hammer support shaft 10 and the link coupling body 13 are coupled by the tension coil spring 107, the same operational effects as those of the first embodiment can be obtained.

  In this embodiment, the groove 103 is provided on the outer peripheral surface of the hammer support shaft 10, and the tension coil spring 107 is disposed in the groove 103. Therefore, it is possible to easily perform the attaching operation and the removing operation of the tension coil spring 107.

The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible.
As shown in FIGS. 15 and 16, the anti-rotation mechanism 52 may be composed of a flat surface portion 71 provided on the outer periphery of the upper portion of the hammer support shaft 10 and an anti-rotation pin 72 that contacts the flat surface portion 71. The anti-rotation pin 72 is inserted through a screw hole 73 formed in the large diameter portion 9 a located above the frame 1 a of the hammer support 9.
Even with such a configuration, the life of the tension coil spring 37 can be extended.
Further, the connecting elastic member is not limited to the tension coil spring but may be made of rubber.

The front view which shows the 1st Embodiment of this invention and shows the internal structure of an eyelet-punching sewing machine Top view showing the internal structure of the eyelet sewing machine Longitudinal front view showing an enlarged peripheral part of the hammer support mechanism Left side view showing enlarged portion around the hammer support mechanism Front view of hammer support and hammer support shaft Longitudinal left side view of hammer support and hammer support shaft Top view of hammer support and hammer support shaft Bottom view of hammer support and hammer support shaft Figure 1 equivalent when cutting the work cloth Figure 1 equivalent when the hammer support shaft is lowered manually. FIG. 6 equivalent view showing the second embodiment of the present invention Equivalent to FIG. Front view of hammer support and hammer support shaft showing third embodiment of the present invention Cross-sectional view along line XIV-XIV in FIG. FIG. 6 equivalent view showing a modification of the present invention FIG. 15 is a cross sectional view showing the tension coil spring along the line XVI-XVI in FIG.

Explanation of symbols

  In the drawings, 1 is an eyelet sewing machine, 1a is a frame (machine frame), 6 is a knife, 9 is a hammer support, 10 is a hammer support shaft, 12 is a hammer, and 13 is a link connecting body (driving force receiving member). , 13b is a pressing surface portion, 13c is a locking piece portion, 14 is an air cylinder (actuator), 16 is a link mechanism (transmission mechanism), 37 is a tension coil spring (elastic member for connection), and 55 is a screw (fixing bracket). Show.

Claims (5)

Processing after or before the formation of a bouncing seam by the cooperation of a knife fixed to the machine frame and a hammer connected to the lower end of a hammer support shaft provided on the machine frame and movable up and down by an actuator In the cloth cutting device for the eyelet-punching sewing machine that forms the eyelet hole in the cloth,
A driving force receiving member that is movable with respect to the hammer support shaft and transmits the driving force of the actuator to the hammer support shaft;
One end is fixed to the hammer support shaft, the other end is fixed to the driving force receiving member, and a coupling elastic member is provided to connect the hammer supporting shaft and the driving force receiving member by an urging force. A cloth cutting device for a perforated sewing machine, characterized by that.   2. The cloth cutting device for eyelet-punched sewing machines according to claim 1, wherein the hammer support shaft is formed in a hollow shape, and the connecting elastic member is disposed inside the hammer support shaft.   The cloth cutting device for an eyelet-operated sewing machine according to claim 1 or 2, wherein a detachable fixing bracket for fixing the driving force receiving member is provided on the hammer support shaft. The actuator is composed of an air cylinder that drives forward and backward,
When the air cylinder is activated, the hammer support shaft moves up and down integrally with the driving force receiving member, and when the air cylinder is stopped, the hammer support shaft is supported against the elastic force of the connecting elastic member. 4. A cloth cutting device for an eyelet sewing machine according to claim 1, wherein the shaft is configured to be pulled downward. The driving force receiving member includes a shaft portion inserted into the hammer support shaft,
The eyelet hole according to any one of claims 1 to 4, wherein the connecting elastic member is constituted by a tension coil spring having both ends locked to the shaft portion and the hammer support shaft, respectively. Cloth cutting device for overlock sewing machine

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