JP4940799B2 - Thread trimming device for eyelet sewing machine - Google Patents

Description

  The present invention relates to a thread trimming device for an eyelet sewing machine that cuts a thread at an eyelet end sewing position by cooperation of an upper blade member and a lower blade member.

  Conventionally, an eyelet sewing machine is generally equipped with a thread trimming device that cuts a lower thread and a core thread. This thread trimming device is housed in a feed base and relatively drives an upper blade member and a lower blade member in directions approaching each other by an actuator such as an air cylinder, so that the blade portion of the upper blade member and the blade of the lower blade member The lower thread and the core thread extending from the work cloth at the end of sewing are cut at the same time by the portion.

  For example, in a thread trimming device for an eyelet sewing machine described in Patent Document 1, the upper knife and the lower knife are pivotably pivoted by a step screw at a position away from the stitch center line of the right feed plate to the right. Worn. A connection link is connected to the thread trimming drive arm, and one end of the upper knife is connected to the connection link via the upper knife link, and one end of the lower knife is connected to the connection link via the lower knife link. When the cylinder is driven to advance during thread trimming, the upper knife and the lower knife simultaneously rotate in the direction of approaching each other via these upper and lower knife links, and the upper knife and the lower knife simultaneously move the lower thread and the core thread. It is designed to cut.

In this case, a leaf spring washer is interposed between the lower knife and the right feed plate, the pressure always acts between the upper knife and the lower knife by this leaf spring washer, and the upper knife lower cover provided on the lower side of the right feed plate. When the thread is trimmed, pressure is applied from the lower knife to the upper knife, and when cutting the lower thread and core thread extending from the eyelet seam with the upper knife and the lower knife simultaneously, the blade pressure is increased and the thread trimming accuracy is increased. We are trying to improve.
JP 2001-321589 A (4th to 6th pages, FIGS. 2 and 3)

  In the thread trimming device for an eyelet sewing machine described in Patent Document 1, the upper knife and the lower knife are pivotally attached to the right feed plate with a step screw so that the upper knife and the lower knife are pivoted by a plate spring washer and an upper knife lower cover. It is configured to stabilize the thread trimming operation by increasing the blade pressure of the knife and lower knife, but in the thread trimming device assembly process, in addition to the leaf spring washer, the upper knife lower cover is attached to the right feed plate. Assembling has to be performed from the lower side, which complicates the assembling work and increases the number of parts, resulting in high costs.

  In particular, for the upper knife lower cover, the pressing force of the lower knife against the upper knife changes due to manufacturing errors or assembly errors in the bending angle of the tip formed integrally with the upper knife lower cover. There is. Therefore, when the pressing force is small, the blade pressure of the upper knife and the lower knife is reduced, and the thread trimming operation becomes unstable. When the pressing force is large, the thread trimming operation is stable, but the frictional force when rotating while the entire upper knife and lower knife are in contact with each other increases, so the load on the air cylinder used to drive the thread trimming is large. Therefore, there is a problem that the thread trimming operation of both the scalpels is delayed and the thread trimming accuracy is deteriorated.

  An object of the present invention is to simplify the configuration and assembly work of a thread trimming device, and to increase the blade pressure of an upper blade member and a lower blade member during thread cutting so as to improve thread cutting performance.

The thread trimming device for an eyelet sewing machine according to claim 1 includes an upper blade member and a lower blade member that are provided on a feed base of a feed device that feeds the workpiece, and are rotatably attached to the workpiece. In the thread trimming device of the eyelet sewing machine that cuts the thread extending from the sewing end position of the formed eyelet stitching with the blade part of the upper blade member and the blade part of the lower blade member, the upper blade member is An upper blade body portion having a top blade body portion and a blade forming portion in which a blade portion is formed on the distal end side of the upper blade body portion and disposed near the upper surface of the upper blade member. A yarn handling member having a base-side fixing portion fixed to the base-side fixing portion and a yarn handling portion extending from the base-end-side fixing portion and positioned near the upper side of the blade forming portion and covering the tip portion of the blade forming portion ; the thread separating member formed of a metallic plate spring material, except for the tip portion of the cutting edge portion of the upper blade member, the blade forming And between the thread separating portion gap is formed, which is constituted of the front end portion of the cutting edge portion of the upper blade member to elastically biased downward by the yarn separating portion of the thread separating member.

By simply fixing the base end side fixing portion of the yarn separating member made of a metal leaf spring to the upper blade main body portion of the upper blade member, the tip end portion of the blade forming portion of the upper blade member is the base end side fixing portion. covered yarn separating portion of the thread separating member located above the vicinity of the cutting edge portion extends from, except for the tip portion of the cutting edge portion, because a gap is formed between the cutting edge portion and the thread separating unit, The tip of the blade forming portion of the upper blade member is elastically biased downward by the yarn separating portion of the yarn separating member that covers the tip . Therefore, at the time of thread cutting, the blade portion formed on the tip side of the blade forming portion of the upper blade member is pressed against the blade portion of the lower blade member, and between the blade portion of the upper blade member and the blade portion of the lower blade member. A predetermined blade pressure is generated, and the thread extending from the sewing end position of the sewing product is reliably cut.

  The thread trimming device for the eyelet sewing machine according to claim 2 is the thread trimming device according to claim 1, wherein the thread separating portion is bent downward with respect to the base end side fixing portion of the thread separating member.

  According to a third aspect of the present invention, there is provided the thread trimming device for the eyelet perforated sewing machine according to the first or second aspect, wherein the tip end portion of the yarn splitting portion of the yarn splitting member projects more than the tip end portion of the blade forming portion of the upper blade member. It is formed at the same height as the blade portion of the member.

According to the first aspect of the present invention, the upper blade member and the lower blade member are provided, and the thread extending from the sewing end position of the eyelet stitching is cut at the blade portion of the upper blade member and the blade portion of the lower blade member. In a thread trimming device for an eyelet perforated sewing machine, the upper blade member has an upper blade body portion and a blade forming portion, and is arranged in the vicinity of the upper surface of the upper blade member and is made of a metal leaf spring material. a member, provided with the thread separating member having a thread separating portion covering the tip portion of the proximal fixing part and the cutting edge portion, a tip portion of the cutting edge portion of the upper blade member by a yarn separating portion of the thread separating member Since it is configured to elastically urge downward, the tip of the blade forming portion of the upper blade member is elastically urged downward by the yarn separating portion of the yarn separating member, so that the blade portion of the upper blade member and the lower blade A predetermined blade pressure is generated at the blade portion of the member, and the thread extending from the sewing end position of the sewing product is reliably cut. Door can be. In addition, since the base end side fixing portion of the yarn separating member is only fixed to the upper blade main body portion of the upper blade member, the configuration and assembly work of the yarn cutting device can be simplified.

Further , a predetermined blade pressure is generated only when the blade portions of the upper blade member and the lower blade member are in contact with each other, and the frictional force when the upper and lower blade members are rotated can be reduced. This can be performed quickly and smoothly, and the thread trimming accuracy can be increased.
Furthermore, since a gap is formed between the blade forming portion and the yarn separating portion except for the tip portion of the blade forming portion of the upper blade member, the tip of the blade forming portion of the upper blade member is formed by the yarn separating portion. The portion can be effectively elastically biased downward, and the blade pressure between the two blade portions can be effectively increased.

  According to the second aspect of the present invention, since the thread separating portion is bent downward with respect to the base end side fixing portion of the thread separating member, the thread separating portion presses the blade forming portion of the upper blade member downward. The pressure can be increased. Other effects similar to those of the first aspect are obtained.

  According to invention of Claim 3, the front-end | tip part of the thread | yarn distribution part of the said thread | yarn distribution member protrudes rather than the front-end | tip part of the blade formation part of an upper blade member, and is formed in the same height as the blade part of an upper blade member. Therefore, when the upper blade member reciprocates in the return direction opposite to the cutting direction for thread cutting, it reliably prevents interference with the left throat plate at the tip and the blade portion of the lower blade member. In addition, it is possible to enhance the guard function for the upper work cloth when the yarn is cut. Other effects similar to those of the first or second aspect are achieved.

  In the thread trimming device of the eyelet sewing machine of the present embodiment, the base end side fixing portion of the thread separating member is fixed to the upper side of the upper blade member, and the blade portion of the upper blade member is lowered by the thread separating portion of the thread separating member. The blade member is pressed against the blade portion side to increase the blade pressure between the two blades.

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the eyelet sewing machine 1 sews an eyelet sewing seam, and a bed base 2 having a substantially rectangular box shape with the upper part opened, and a bed base 2 fitted into the bed base 2. A sewing machine table (illustrated) has a bed part 3 placed thereon, a leg part 4 standing from the rear part of the bed part 3, an arm part 5 extending forward from the upper part of the leg part 4, and the like. Abbreviated)

  A needle bar (not shown) provided with a sewing needle (not shown) is provided at the lower end of the arm portion 5 so as to be movable up and down. Although not shown in detail, the rotational force of the main shaft that is rotated by the driving of the sewing machine motor is a cam. It is transmitted to the mechanism and is driven up and down while swinging left and right by a predetermined width. In this case, every time the main shaft rotates twice, the needle bar swings between a left swing position and a right swing position.

  The bed 3 is provided with a looper base (not shown) provided with two loopers (not shown) so as to face the needle bar, and these two loopers rotate the main shaft via a cam mechanism (not shown). Thus, the needle bar is driven in time with the vertical movement. The needle bar and the looper base are rotated integrally around the vertical axis in a horizontal plane by a rotation mechanism (not shown) including a θ-direction drive motor and a gear mechanism provided in the bed 3. Yes.

  The bed 3 is detachably mounted with a knife (not shown) for forming a fixed eyelet located on the rear side of the looper base, and is punched so as to contact and separate from the knife from above. A hammer body (not shown) is provided to be swingable. A hammer (not shown) for eyelet holes is detachably attached to the tip of the hammer body, and is driven by a hammer drive mechanism (not shown) made up of an air cylinder or the like provided in the bed 3. A hole is drilled in the work cloth.

  A feed base 7 on which a work cloth is set is provided on the upper surface of the bed 3. The feed base 7 has a thin rectangular box shape as a whole, and a pair of left and right cloth receiving plates 8 and 9 are formed on the upper surface of the central portion in the left and right direction of the feed base 7 as shown in FIGS. Are provided. The right needle plate 11 and the left needle plate 10 are fixed to the middle portions of the cloth receiving plates 8 and 9 in the front-rear direction by screws 12, respectively. The substantially front end portions of the cloth receiving plates 8 and 9 are covered with a cover plate 13 (see FIG. 2).

  In the bed portion 3, an X-direction moving mechanism (not shown) that moves the feed base 7 in the X direction (left and right direction) by driving the X direction feed motor, and the Y direction (not shown) by driving the Y direction feed motor. A Y-direction moving mechanism (not shown) is provided for feeding and moving in the front-rear direction. The feed base 7, the X-direction moving mechanism, and the Y-direction moving mechanism constitute a feeding device that feeds the workpiece.

  A pair of left and right cloth presser levers 15 and 16 for holding a workpiece to be sewn such as a work cloth to be used for sewing are provided on the upper surface of the feed base 7. Are omitted). These presser foot levers 15 and 16 are driven by an air cylinder (not shown) to be switched between an upper retracted position and a lower pressed position.

Next, the thread trimming device 20 provided inside the feed base 7 for cutting the lower thread and the core thread will be described.
The thread trimming device 20 includes an upper blade member 21 and a lower blade member 22 that are rotatably supported on the upper surface of the right cloth receiving plate 9, and a thread trimming operation mechanism 23 that operates the both blade members 21 and 22 by thread trimming. The thread trimming operation mechanism 23 is configured by a thread trimming air cylinder 24 and the like.

  As shown in FIG. 2, the lower blade member 22 positioned on the lower side and the upper blade member positioned on the upper side of the lower blade member 22 on the front side of the right needle plate 11 in the upper surface of the right cloth receiving plate 9. 21 is rotatably supported by a first stage screw 25. The lower end of the first stage screw 25 is fixed with a nut 25a. In this case, as shown in FIG. 3, a wave washer 26 is provided between the lower blade member 22 and the right cloth receiving plate 9, and the upper and lower blade members 21, 22 are attached to the right cloth receiving plate 9 by the first stage screw 25. It is supported in a tightening shape.

  Therefore, a slight blade pressure is generated between the upper and lower blade members 21 and 22 by the spring force of the wave washer 26. The upper blade member 21 is composed of an upper blade main body portion 21a which is a large part and a blade forming portion 21b which is a tip side portion of the upper blade main body portion 21a. 21c (corresponding to the blade portion) is formed. A lower blade 22 a is formed on the left side surface of the linear rear end portion of the lower blade member 22.

  As shown in FIG. 2 and FIG. 4 to FIG. 6, a thread separating member 27 having a substantially square shape in plan view is disposed near the upper surface of the upper blade member 21. The yarn separating member 27 includes a proximal end side fixing portion 27a at the proximal end portion and a yarn separating portion 27b at the distal end portion. The yarn separating member 27 is fixed to the upper blade main body 21a by a fixing screw 28 at the base end side fixing portion 27a. The thread separating member 27 prevents the upper blade member 21 from being caught on the work cloth when the upper blade member 21 is in contact with the lower surface of the work cloth located on the upper side and performs a thread cutting operation by horizontal reciprocating rotation. It is.

The yarn separating member 27 is made of a metallic leaf spring material such as SK material (quenched carbon tool steel) and has an elastic force. As shown in FIG. 6, the yarn separating portion 27b extending from the proximal end fixing portion 27a to the distal end side is bent downward at a predetermined angle (about 15 °) with respect to the proximal end fixing portion 27a of the yarn separating member 27. It is formed and is located near the upper side of the blade forming portion 21b. Thread separating portion 27b so as not to interfere during thread cutting, Figure 2, as shown in FIG. 7, and Tsu covering from the upper side only the cutting edge of the upper blade 21c of the upper blade member 21.

  In this case, as shown in FIG. 4, a clearance S is formed between the blade forming portion 21b and the yarn separating portion 27b except for the tip of the blade forming portion 21b of the upper blade member 21. Therefore, the tip of the blade forming portion 21b of the upper blade member 21 is always elastically biased downward by the yarn separating portion 27b of the yarn separating member 27 bent downward by a predetermined angle (about 15 °). Therefore, the upper blade 21c of the upper blade member 21 is strongly pressed and urged against the lower blade 22a of the lower blade member 22, and a predetermined blade pressure is generated between the blades 21c and 22a only when the yarn is cut. Yes.

  Furthermore, as shown in FIG. 6, the horizontal tip 27 c of the yarn separating portion 27 b of the yarn separating member 27 protrudes beyond the tip of the blade forming portion 21 b of the upper blade member 21, and the upper blade 21 c of the upper blade member 21. It is formed at the same height. Therefore, when the upper blade member 21 rotates clockwise in plan view for thread cutting, the horizontal tip 27c does not interfere with the left needle plate 10 or the lower blade 22a of the lower blade member 22, Moreover, the upper work cloth is not damaged when the yarn is cut.

  As shown in FIG. 2, a thread trimming air cylinder 24 is disposed in the left-right direction at the front end inside the feed base 7, and a substantially U-shaped connecting member 29 in plan view is fixed to the tip of the piston rod 24a. Has been. The thread trimming air cylinder 24 receives compressed air from a valve unit (not shown) during thread trimming, and drives the piston rod 24a to advance.

  A thread trimming operation mechanism 23 that operates the upper blade member 21 and the lower blade member 22 is provided on the rear side of the connecting member 29. Next, the thread trimming operation mechanism 23 will be described.

  As shown in FIG. 2, the bent portion of the substantially actuated first operating link 30 is rotatably supported by the second-stage screw 31 on the lower surface of the right cloth receiving plate 9 as a rotation fulcrum. An upper end portion of a downward support shaft 32 is fixed to the front end portion of the first operation link 30, and a roller member 33 is rotatably supported on the support shaft 32. Immediately behind the first operating link 30, a drive shaft 34 is rotatably supported by penetrating from the lower side of the right cloth receiving plate 9 to the upper side thereof.

  A bent portion of the drive link 35 having a substantially square shape in plan view is fixed to the lower end portion of the drive shaft 34, that is, the lower end portion protruding to the lower side of the right cloth receiving plate 9 as a rotation fulcrum. Further, the rear end portion of the first operating link 30 and the right end portion of the first connecting link 36 are connected by a first pin 37, and the left end portion of the first connecting link 36 and the front end portion of the drive link 35 are second. The pins 38 are connected.

  On the upper side of the right cloth receiving plate 9, the bent portion of the second operation link 39 having a substantially V shape in plan view is formed at the upper end of the drive shaft 34, that is, the upper end of the right cloth receiving plate 9. It is fixed. The distal end portion of the first arm portion 39a of the second operating link 39 and the left end portion of the second connecting link 40 are connected by the third pin 41, and the right end portion of the second connecting link 40 and the protruding shape of the lower blade member 22 are connected. The lower blade connecting portion 22b formed on the second pin 42 is connected by a fourth pin 42.

  Furthermore, the tip end portion of the second arm portion 39b of the second operation link 39 and the front end portion of the third connection link 43 are connected by the fifth pin 44, and the rear end portion of the third connection link 43 and the upper blade member 21 are connected. The upper blade connecting portion 21 b formed in a protruding shape is connected by a sixth pin 45. Here, as shown by a two-dot chain line in FIG. 2, a substantially V-shaped concave portion 8a is formed on the upper surface portion of the right cloth receiving plate 9, and the second connecting link 40 and the third connecting link 43 are connected thereto. It is accommodated in the recess 8a. Therefore, the second operating link 39, the lower blade member 22, and the upper blade connecting portion 21 b of the upper blade member 21 are disposed so as to contact the upper surface of the right cloth receiving plate 9.

  A rear end portion of the plate member 46 in the front-rear direction is fixed to the drive link 35 below the right fabric receiving plate 9, and a screw 47 fixed to the front end portion of the plate member 46 and the lower surface of the right fabric receiving plate 9; On the other hand, a tension coil spring 48 is hung. Therefore, the first operating link 30 is brought into contact with the standby position restricting member 49 fixed to the lower surface of the right cloth receiving plate 9 through the link mechanism including the plurality of links 30, 35, 36, 39, 40, 43. In contact therewith, it is always elastically biased to the standby position shown in FIG.

  As shown in FIG. 2, the lower blade member 22 is positioned at a standby position that functions as a part of the right throat plate 11, and the upper blade member 21 is positioned at a standby position that is wide open toward the left throat plate 10. Yes. In this state, when the air cylinder 24 for thread trimming is driven and the piston rod 24a is driven to advance to the advanced position indicated by a two-dot chain line in FIG. 2, the first operating link 30 is completed through the connecting member 29. It rotates counterclockwise to a position (not shown).

  When the upper blade 21c of the upper blade member 21 and the lower blade 22a of the lower blade member 22 meet, at the end of sewing the eyelet stitching, the lower thread extending from the sewing end position and the core thread are cut. In addition, as shown in FIG. 7, although the second operation link 39 is rotating, the drive shaft 34 of the second operation link 39 and the third pin 41 and the fourth pin of the second connection link 40. 42 may be positioned on a straight line.

  In this case, since the third pin 41 moves on an arc centered on the drive shaft 34, the lower blade member 22 does not receive any rotational force from the second connection link 40 at the lower blade connection portion 22b. The rotation of the blade member 22 stops. However, since the third connecting link 43 is pulled forward by the rotation of the second operation link 39 and the upper blade member 21 continues to receive the turning force in the clockwise direction, it continues to rotate toward the lower blade member 22. . Thus, in a state where the lower blade member 22 is substantially stopped from rotating, the lower thread and the core thread are cut by the rotation of only the upper blade member 21.

Next, the operation and effect of the thread trimming device 20 configured as described above will be described.
At the time of sewing preparation or during sewing, the thread trimming air cylinder 24 is not driven. Therefore, as described above, the upper blade member 21 and the lower blade member 22 are positioned at the standby positions shown in FIG. When the thread trimming air cylinder 24 is driven to advance at the end of sewing, as described above, the upper blade member 21 and the lower blade member are rotated by the rotation of the first operation link 30 and the drive link 35 as shown in FIG. 22 is rotated in a direction approaching each other, and in the middle of rotation of the lower blade member 22, the drive shaft 34 of the second operation link 39, the third pin 41 and the fourth pin 42 of the second connection link 40, Are in a straight line for a predetermined period.

  At this time, as described above, only the upper blade member 21 is rotated in the clockwise direction in a state where the lower blade member 22 is substantially stopped while the second operation link 39 is rotating. That is, it continues to rotate toward the lower blade member 22. Therefore, in a state where the lower blade member 22 is substantially stopped from rotating, the lower thread and the core thread are cut by the rotation of only the upper blade member 21.

  At the time of cutting the yarn, as described above, the blade pressure is generated between the upper and lower blades 21 and 22 by the spring force of the wave washer 26. Furthermore, since the tip of the blade forming portion 21b of the upper blade member 21 is bent downward at a predetermined angle of the yarn separating portion 27b, a predetermined blade pressure is generated between the both blades 21c and 22a. The lower thread extending from the core and the core thread are surely cut.

  As described above, the yarn separating member 27 disposed near the upper surface of the upper blade member 21 and having the base end side fixing portion 27a and the yarn separating portion 27b is provided, and the yarn separating member 27 is made of a metal leaf spring material. The tip portion of the blade forming portion 21b of the upper blade member 21 is elastically biased downward by the yarn separating portion 27b of the yarn separating member 27. Accordingly, a predetermined blade pressure is generated between the upper blade 21c of the upper blade member 21 and the lower blade 22a of the lower blade member 22, and the lower thread and the core thread extending from the sewing end position of the work cloth can be surely cut. it can.

  Moreover, since the thread separating member 27 is simply fixed to the upper side of the blade forming portion 21b of the upper blade member 21 with the fixing screw 28, the configuration and assembly work of the thread trimming device 20 can be simplified. Furthermore, since the predetermined blade pressure is generated only when the blade portions 21c and 22a of the upper blade member 21 and the lower blade member 22 are in contact with each other, the frictional force when the upper and lower blade members 21 and 22 are rotated can be reduced. The thread trimming operation by the upper and lower blade members 21 and 22 can be performed quickly and smoothly, and the thread trimming accuracy can be increased.

  Since the yarn separating portion 27b is bent downward at a predetermined angle (about 15 °) with respect to the base end side fixing portion 27a of the yarn separating member 27, the yarn separating portion 27b is formed with respect to the blade forming portion 21b of the upper blade member 21. The downward pressing force can be increased.

  Since the tip of the yarn separating part 27b of the yarn separating member 27 protrudes from the tip of the blade forming part 21b of the upper blade member 21 and is formed at the same height as the blade part of the upper blade member 21, the cutting direction When reciprocating in the reverse direction, the interference with the left needle plate 10 at the tip and the lower blade 22a of the lower blade member 22 can be reliably prevented, and the upper work cloth can be removed when cutting the yarn. It will not hurt.

  Further, since a gap S is formed between the blade forming portion 21b and the yarn separating portion 27b except for the tip portion of the blade forming portion 21b of the upper blade member 21, the upper blade member 21 is formed by the yarn separating portion 27b. The tip of the blade forming portion 21b can be effectively elastically biased downward, and the blade pressure between the blades 21c and 22a can be effectively increased.

Next, a modified embodiment in which the above embodiment is partially modified will be described.
1) The predetermined bending angle of the yarn separating member 27 with respect to the proximal-side fixing portion 27a of the yarn separating member 27 is not limited to about 15 °, and depends on the material of the yarn separating member 27 and the type of yarn to be cut. It can be changed as appropriate. Further, the material of the yarn separating member 27 is not limited to the SK material, and may be made of a general plate-shaped spring steel.

2) It is also possible that substantially the entire thread separating portion 27b is in contact with the blade forming portion 21b without forming a gap between the blade forming portion 21b of the upper blade member 21 and the thread separating portion 27b. Also in this case, the same effect as the above-described embodiment can be obtained.

1 is a perspective view of an eyelet hole sewing machine according to an embodiment of the present invention. It is a top view of a thread trimming device. It is CC sectional view taken on the line of FIG. FIG. 3 is a view taken in the direction of arrow D in FIG. 2. It is a top view of a thread separating member. It is a front view of a thread separating member. FIG. 3 is a view corresponding to FIG. 2 during a thread trimming operation.

1 Eyelet hole sewing machine 7 Feed base 20 Thread trimmer 22a Lower blade (blade)
21 Upper blade member 21a Upper blade body portion 21b Blade forming portion 21c Upper blade (blade portion)
22 Lower blade member 27 Thread separation member 27b Thread separation portion 27a Base end side fixing portion 27c Horizontal distal end portion S Clearance

Claims (3)

An upper blade member and a lower blade member, which are provided on a feed base of the feed device for feeding the workpiece and are rotatably mounted, extend from the sewing end position of the eyelet stitching formed on the workpiece. In the thread trimming device of the eyelet-operated sewing machine that cuts the thread to be cut by the blade part of the upper blade member and the blade part of the lower blade member,
The upper blade member has an upper blade body part and a blade forming part in which a blade part is formed on the tip side of the upper blade body part,
A yarn handling member disposed in the vicinity of the upper surface of the upper blade member, and is positioned near the upper side of the blade forming portion extending from the proximal side fixing portion and fixed to the upper blade body portion. And a yarn spreading member having a yarn spreading portion that covers the tip of the blade forming portion, the yarn spreading member is made of a metal leaf spring material,
Except for the tip of the blade forming portion of the upper blade member, a gap is formed between this blade forming portion and the yarn separating portion,
A thread trimming device for an eyelet stitching sewing machine, wherein the thread separating portion of the thread separating member is configured to elastically urge the tip of the blade forming portion of the upper blade member downward.   2. The thread trimming device for an eyelet sewing machine according to claim 1, wherein a thread separating portion is bent downward with respect to a base end side fixing portion of the thread separating member.   The tip portion of the yarn spreading portion of the yarn spreading member projects from the tip portion of the blade forming portion of the upper blade member and is formed at the same height as the blade portion of the upper blade member. Item 3. A thread trimming device for eyelet sewing machine according to item 1 or 2.

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