JP2017148217A - Residual thread cutting device and sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a residual sewing thread remaining on a workpiece after being sewn while minimizing time and effort.SOLUTION: A residual thread cutting device CM for cutting a residual sewing thread SEW remaining on a workpiece after being sewn by a sewing machine includes: a set plate 2 which can be mounted on the sewing machine; an insertion part 6 which passes through the set plate 2 in a thickness direction, and in which the residual sewing thread SEW can be inserted; a thread cutting unit 10 provided on the back side of the insertion part 6; and a pulling unit 40 for pulling the residual sewing thread SEW from a workpiece W toward the thread cutting unit 10. The residual sewing thread SEW inserted in the insertion part 6 is cut by the thread cutting unit 10 while being pulled by the pulling unit 40.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a remaining thread cutting device for cutting a remaining sewing thread remaining on a work after sewing and a sewing machine in which the device is assembled.

  In this type of sewing machine, it is necessary to cut the upper thread and lower thread (sewing thread) drawn into the sewing machine from the work at the end of sewing at the end of the sewing work. For example, the sewing machine disclosed in Patent Document 1 has a needle plate provided with a needle hole and a thread trimming mechanism disposed on the back side of the needle plate. The thread trimming mechanism has a thread trimming blade disposed in the vicinity of the needle hole and a thread insertion plate disposed so as to face the thread trimming blade. It is set as the structure which moves toward. A sewing thread extending from the work at the end of sewing is inserted into the needle hole of the needle plate and drawn into the sewing machine. Therefore, the work sewing operation can be completed by pressing the work thread inserted through the needle plate against the thread cutting blade with a thread insertion plate and cutting it.

JP-A-7-31781

  By the way, in the known technique, even after the sewing thread is cut by the thread trimming blade, a considerable length of the sewing thread may remain on the work, and a post-work is required to shorten the remaining sewing thread after sewing. In this type of post-work, the remaining sewing thread is typically cut or burnt out by hand, which tends to be troublesome. For this reason, in this type of field, there has been a demand for shortening the remaining sewing thread remaining on the work after sewing as much as possible without much labor. The present invention has been devised in view of the above points, and a problem to be solved by the present invention is to shorten the remaining sewing thread remaining on the workpiece after sewing as much as possible without much labor.

  As a means for solving the above problems, the remaining thread cutting device of the first invention is a device for cutting the remaining sewing thread remaining on the workpiece after sewing by the sewing machine, and shortens the remaining sewing thread as much as possible without much trouble. Used to do. This remaining thread cutting device includes a set plate that can be assembled to a sewing machine, an insertion portion that can be inserted through the set plate in the thickness direction to insert the remaining sewing thread, and a thread cutter provided on the back side of the insertion portion. And a tensioning device that pulls the remaining sewing thread from the workpiece toward the thread trimming device. The remaining sewing thread inserted into the insertion portion is cut by the thread cutting device while being pulled by the pulling device. In the present invention, the remaining sewing thread remaining on the workpiece can be shortened as much as possible by cutting it while pulling.

  The remaining thread cutting device according to a second aspect of the present invention is the remaining yarn cutting device according to the first aspect, wherein the tension device sucks the remaining sewing thread from the workpiece toward the thread cutting device. In the present invention, while the remaining sewing thread is preferably sucked and pulled by the tensioning device, foreign matters such as fiber waste generated from the remaining sewing thread can be sucked and removed.

  The remaining yarn cutting device of the third invention is the remaining yarn cutting device of the first or second invention, wherein the set plate, the yarn cutting device, and the tensioning device are assembled into a unit, so that the remaining yarn cutting device The structure is compact and can be assembled smoothly to the sewing machine.

  The remaining yarn cutting device according to a fourth aspect of the present invention is the remaining yarn cutting device according to any one of the first to third aspects, wherein the set plate can be assembled adjacent to the needle plate of the sewing machine. In the state where the set plate is assembled to the sewing machine, the insertion portion is extended in a direction away from the needle plate, and the remaining sewing thread is cut by the thread trimming device in the middle of the insertion portion. is there. In the present invention, the remaining sewing thread is cut by the thread trimming device in the middle of the insertion portion extending in the direction away from the needle plate. For this reason, the thread trimming device can be arranged as far as possible from the needle plate, and the remaining sewing thread can be smoothly guided toward the thread trimming device by the insertion portion.

  The remaining yarn cutting device according to a fifth aspect of the present invention is the residual yarn cutting device according to the fourth aspect of the invention, wherein the insertion portion has an opening that opens at the edge of the set plate on the throat plate side, and gradually narrows away from the opening. Thus, the thread is closed at the end, and the remaining sewing thread is cut by the thread trimming device at a position where the opening dimension is narrower than the opening. In the present invention, by providing a portion where the remaining sewing thread is cut in a relatively narrow portion of the insertion portion, it is possible to suitably avoid various foreign objects from entering the cut portion.

  The remaining yarn cutting device according to a sixth aspect of the present invention is the remaining yarn cutting device according to any one of the first to fifth aspects of the invention, wherein the set plate is provided with a thin plate portion having a smaller thickness dimension than other portions of the set plate. The remaining sewing thread is cut by the thread trimming device at the insertion portion provided in the thin plate portion. In the present invention, since the remaining sewing thread is cut by the thread trimming device at the insertion portion provided in the thin plate portion having a relatively thin plate thickness, the thread trimming device is as close as possible to the set plate side. The remaining sewing thread can be cut.

  In the sewing machine of the seventh invention, since the remaining thread cutting device of any one of the first to sixth inventions is assembled, the remaining sewing thread remaining on the work can be smoothly shortened after the work is sewn. it can.

  According to the first aspect of the present invention, the remaining sewing thread remaining on the work after sewing can be made shorter without much effort. According to the second invention, the remaining sewing thread remaining on the workpiece after sewing can be suitably shortened. According to the third aspect of the invention, the remaining sewing thread remaining on the work after sewing can be further shortened with a relatively simple configuration. According to the fourth invention, the remaining sewing thread remaining on the work after sewing can be shortened more reliably. According to the fifth aspect of the invention, the remaining sewing thread remaining on the work after sewing can be further reliably shortened. According to the sixth invention, the remaining sewing thread remaining on the workpiece after sewing can be further shortened. According to the seventh aspect of the invention, the remaining sewing thread remaining on the work after sewing can be shortened more smoothly by the sewing machine.

It is a schematic front view of the sewing machine on a work table. It is a schematic side view of the sewing machine on a work table. It is a top view of a part of head part with which the remaining yarn cutting device is assembled. It is a front view of a part of head part with which the remaining thread cut device was assembled | attached. It is sectional drawing of a part of head part with which the remaining thread cutting apparatus was assembled | attached. It is the schematic which decomposes | disassembles a remaining yarn cut apparatus, and shows the main members. It is a perspective view which decomposes | disassembles and shows a part of thread | yarn cutting device and a rocking | fluctuation mechanism. It is a perspective view which decomposes | disassembles and shows a part of thread cutting device and a rocking | fluctuation mechanism. It is a top view of a part of head part in which the work after sewing is arranged. It is a see-through | perspective top view of a part of remaining thread cutting apparatus before cut | disconnecting the remaining sewing thread. It is a see-through | perspective top view of a part of remaining thread cutting apparatus at the time of cut | disconnecting a remaining sewing thread. It is a partially transparent front view of a part of the remaining thread cutting device when cutting the remaining sewing thread. It is a see-through | perspective top view of the part of remaining thread cutting apparatus concerning a modification.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to FIGS. In each drawing, for convenience, arrow lines indicating the front-rear direction, the left-right direction, and the up-down direction of the sewing machine MM may be illustrated. Further, the directions shown in the remaining yarn cutting device CM and its constituent members are directions based on the state in which the remaining yarn cutting device CM is assembled to the sewing machine MM.

[sewing machine]
The sewing machine MM of FIG. 1 is installed on the upper surface of a biped table T as a work table, and has a head portion 2m on which a work W shown in FIG. 9 can be placed, a leg post portion 4m, and an arm portion 6m. ing. The leg column part 4m stands from the right end of the head part 2m, and the arm part 6m extends leftward from the upper part of the leg pillar part 4m and is disposed above the head part 2m. A sewing needle 8m and a presser foot 10m are attached to the lower right part of the arm 6m so as to be movable up and down toward the head 2m with reference to FIG.

  Further, referring to FIG. 3, a needle plate 12m and an assembly portion 14m are provided on the upper surface of the head portion 2m, and a bobbin (not shown) of a lower thread is accommodated in the head portion 2m. A hook 16m and a thread cutting blade (not shown) are arranged. The needle plate 12m is a substantially rectangular flat plate when viewed from above, and includes a needle hole 13m arranged at a position opposed to the sewing machine needle 8m shown in FIG. 2 and a feed dog 15m arranged around the needle hole 13m. ing. The thread cutting blade is disposed on the back side of the needle plate 12m and can cut the sewing thread inserted through the needle hole 13m. Here, the raising and lowering operation of the sewing needle 8m and the presser foot 10m and the driving of the thread cutting blade shown in FIG. 2 are performed by stepping on a pedal (not shown) provided at the lower part of the biped table T, for example. can do.

  Moreover, the assembly | attachment part 14m is a notch site | part of the upper surface of the head part 2m provided in the left side of the needle plate 12m with reference to FIG.3 and FIG.5. Referring to FIG. 5, the assembly portion 14m is composed of a front front wall portion 20m and a rear rear wall portion 24m. The front wall portion 20m and the rear wall are arranged at appropriate intervals in the front-rear direction. For example, a substantially rectangular sliding plate (not shown) can be attached to the space between the portions 24m while sliding. And the front side taper surface 22m is provided in the upper end of the front wall part 20m, and this front side taper surface 22m inclines ahead gradually toward the downward direction. A rear taper surface 26m is provided at the upper end of the rear wall portion 24m, and the rear taper surface 26m is gradually inclined backward as it goes downward.

  Then, referring to FIG. 9, a work W such as a cloth material arranged on the upper surface of the head portion 2m is sewn by the above-described sewing machine MM. At this time, the workpiece W is held by the feed dog 15m and the presser foot 10m shown in FIG. Thus, the workpiece W is sewn by appropriately interlacing the upper thread of the sewing needle 8m with the lower thread supplied from the shuttle 16m shown in FIG. 3 in the head portion 2m. At the end of sewing of the workpiece W, the sewing thread (upper thread and lower thread) drawn from the workpiece W into the needle hole 13m is cut with a thread cutting blade (not shown). In this type of configuration, even after the sewing thread SEW is cut by the thread trimming blade, the remaining sewing thread SEW having a considerable length remains on the workpiece W with reference to FIGS. 10 and 12. there were. Therefore, in this embodiment, by using a remaining thread cutting device CM, which will be described later, the remaining sewing thread SEW is cut as short as possible without much effort. Hereinafter, each configuration will be described in detail.

[Remaining thread cutting device]
The remaining yarn cutting device CM includes a set plate 2, a yarn cutting device 10, and a tensioning device 40 with reference to FIGS. 3 to 6 (the configuration of each member will be described later). In this remaining yarn cutting device CM, as will be described later, the set plate 2, the yarn cutting device 10, and the tensioning device 40 are assembled into a unit, and the set plate 2 is assembled to the assembly portion 14m of the head portion 2m. And is arranged adjacent to the needle plate 12m. As described above, by attaching the remaining thread cutting device CM to an appropriate position of the sewing machine MM, after the operator finishes the sewing work of the workpiece W, the operation shifts to the operation of smoothly shortening the remaining sewing thread SEW. Can do.

[Set plate]
3 and 6, the set plate 2 is a substantially rectangular flat plate material as viewed from above, and has a short right side 2a that forms the right side, a short left side 2b that forms the left side, and a front side. It has a long front side 2c and a long rear side 2d forming the rear side. This set plate 2 can be assembled to the assembly portion 14m of the head portion 2m instead of a sliding plate (not shown). Referring to FIG. 5, the front side 2c of the set plate 2 has a tapered shape corresponding to the front wall 20m of the assembly 14m, and gradually inclines forward as it goes downward. The other sides are not tapered and are arranged so as to be approximately 90 ° with respect to the upper surface of the set plate 2. When the set plate 2 is assembled to the sewing machine MM, which will be described later, the set plate 2 is placed in the assembly portion 14m while the front side 2c of the set plate 2 is applied to the front tapered surface 22m provided on the front wall portion 20m. Will be inserted into.

[Thin plate part / insertion part]
3 and 6, the set plate 2 is provided with a thin plate portion 4, an insertion portion 6, and a plurality of mounting holes H1 to H9 described later. The thin plate portion 4 is a portion having a substantially rectangular shape in a top view capable of accommodating a fixed blade 12 and a movable blade 14 to be described later, and is formed from the right side portion 2a of the set plate 2 toward the left. Referring to FIG. 4, the plate thickness T2 of the set plate 2 in the thin plate portion 4 is made smaller than the plate thickness T1 of other portions of the set plate 2, for example, the plate thickness of the needle plate 12m. It can be set thinner. The insertion portion 6 is a notch-like portion that penetrates through the set plate 2 in the thickness direction with reference to FIG. 3, and as shown in FIGS. The cutting device 10 can guide to a location where it can be cut (meshing location CP). The right side of the insertion portion 6 has a substantially triangular shape when viewed from above and has a relatively large opening size, and an opening 6a is provided at the right end thereof. Moreover, the left side of the insertion part 6 is made into linear form, and the opening dimension is made relatively small, and it is closed with the left terminal part 6b provided in the left end. Referring to FIG. 6, on the right side of the insertion portion 6, the opening 6a having the largest opening dimension L1 opens to the right side 2a of the set plate 2 and goes to the left away from the opening 6a. Accordingly, the opening size is gradually narrowed (the opening size on the left side of the narrowest part is L2, L2 <L1). When the set plate 2 is assembled to the sewing machine MM, the opening 6a is arranged adjacent to the needle plate 12m of the sewing machine MM, and the left end portion 6b is arranged at a position farthest from the needle plate 12m. Is done.

  Further, referring to FIGS. 3 and 6, the set plate 2 is provided with a plurality of mounting holes H <b> 1 to H <b> 9 (all through holes). Then, the fixing plate 8 and the thread trimmer 10 and the tensioning device 40 described later can be assembled at appropriate positions on the set plate 2 by using countersunk screws CS and screws S inserted through appropriate mounting holes. Here, the fixed plate 8 is a substantially rectangular flat plate material as viewed from above, and can be rotatably assembled to the back side of the set plate 2. In this embodiment, referring to FIG. 5, a countersunk screw CS is inserted into a first mounting hole H1 provided in the approximate center on the rear side 2d side, and the axis of the countersunk screw CS is connected to the back surface of the set plate 2. Make it protrude. The fixing plate 8 is rotatably attached to the back surface of the set plate 2 by screwing the shaft of the countersunk screw CS into a hole 8 a provided in the center of the fixing plate 8. When the set plate 2 is assembled to the sewing machine MM, the fixing plate 8 is protruded rearward from the rear side 2d while being appropriately rotated around the axis of the countersunk screw CS, and the protruding fixing plate 8 is assembled. It can be locked to the back side of the rear wall portion 24m of the portion 14m. In addition, with reference to FIG. 6, the fixing plate 8 is provided with another hole portion 8b on the end side of the hole portion 8a, and by appropriately selecting the hole portion into which the countersunk screw CS is inserted, The projecting dimension from the side 2d can be adjusted. That is, by screwing the shaft of the countersunk screw CS into another hole 8 a of the fixing plate 8, the protruding dimension of the fixing plate 8 can be increased.

[Thread trimming device]
3 and 6, the thread cutting device 10 is a device that cuts the remaining sewing thread SEW, and includes a fixed blade 12, a movable blade 14, and a coupling mechanism JM. In this embodiment, the fixed blade 12 and the movable blade 14 are connected via a connection mechanism JM shown in FIG. 7 described later, and the movable blade 14 is further swung by a swing mechanism SM shown in FIG. 8 described later. While being engaged with the fixed blade 12. The fixed blade 12 is a substantially rectangular flat plate member fixed to the back side of the set plate 2 with reference to FIGS. 3 and 6, and includes a first blade portion 12a, three pairs of screw holes 12b to 12d, It has a fixing hole 12e and a screw hole 12f. The first blade portion 12a is a single blade that protrudes rightward from the rear portion of the right edge of the fixed blade 12. The blade edge of the first blade portion 12a has a substantially horizontal L shape, and the front of the first blade portion 12a. Continuous from edge to right edge. The three pairs of screw holes 12b to 12d are through holes of the fixed blade 12 provided so as to form a triangular apex when viewed from above. These screw holes 12b to 12d are respectively arranged so as to be able to face corresponding second mounting holes H2 to fourth mounting holes H4 formed in the thin plate portion 4 of the set plate 2. The screw hole 12f is a through hole provided in the first blade portion 12a, and is disposed so as to be able to face the screw hole 7 on the back surface of the set plate 2. The fixed hole 12e is a through-hole through which a rocking shaft 20 of a coupling mechanism JM, which will be described later, can be inserted with reference to FIG. 7, and is provided at the front center of the fixed blade 12.

  Then, referring to FIG. 3, the fixed blade 12 is fixed to the back side of the set plate 2 via screws S and screws BS. At this time, as shown in FIG. 7, the screw S is inserted through the screw holes 12b to 12d of the fixed blade 12, and the shaft of the screw S is screwed into the mounting holes H2 to H4 shown in FIG. 7 shows only one screw S for convenience). Further, the fixed blade 12 is screwed into the screw hole 7 shown in FIG. 6 while inserting the screw BS shown in FIG. Can be fixed to the back side. In this state, referring to FIG. 3, the blade edge of the first blade portion 12a is disposed on the back side of the insertion portion 6 of the set plate 2, and the corners of the front edge and the right edge, which are the root side of the blade edge. The portion is exposed from the left insertion portion 6.

  3 and 6, the movable blade 14 is a member that can mesh with the fixed blade 12, and is connected to the back side of the fixed blade 12 via a connection mechanism JM described later. Referring to FIG. 7, the movable blade 14 is a flat plate member that is long in the left-right direction, and includes a second blade portion 14a, an insertion recess 14b, and a pair of screw holes 14c and 14d. The 2nd blade part 14a is the single blade provided in the right end of the movable blade 14, and the blade edge of this 2nd blade part 14a is orient | assigned back, and is arrange | positioned so that it can mesh | engage with the blade edge of the 1st blade part 12a. The insertion recess 14b is a notch-like portion that opens forward on the left side of the movable blade 14, and can be formed by curving the left side of the movable blade 14 in a substantially U shape when viewed from above. The pair of screw holes 14c and 14d are through holes provided on the left and right sides of the movable blade 14 with the insertion recess 14b interposed therebetween.

[Coupling mechanism]
The movable blade 14 and the fixed blade 12 are engaged with each other by the coupling mechanism JM having the swing shaft 20, the spring member 22, and the mounting seat 24 with reference to FIG. So that they are connected. Here, the swing shaft 20 is a cylindrical member into which the shaft pin 20 a is inserted, and is fixed to the fixed blade 12. That is, the swing shaft 20 is inserted into the fixed hole 12e of the fixed blade 12, and the upper end of the swing shaft 20 protruding from the fixed hole 12e is screwed into the nut NT. The mounting seat 24 is a triangular member as viewed from above, and is fixed so as to straddle the insertion recess 14 b of the movable blade 14. The mounting seat 24 is provided with a first insertion hole 24 a and a second insertion hole 24 b, and both the insertion holes 24 a and 24 b are through holes formed in parallel to the center of the mounting seat 24. Screw holes 24c and 24d corresponding to the screw holes 14c and 14d of the movable blade 14 are provided on the left and right sides of both the insertion holes 24a and 24b. Then, screws S are inserted into the screw holes (14c and 24c, 14d and 24d) of the movable blade 14 and the mounting seat 24, and the mounting seat 24 is fixed so as to straddle the insertion recess 14b (in FIG. 7, for convenience) Only one screw S is shown). In this state, the first insertion hole 24a is disposed on the rear side behind the insertion recess 14b, and the second insertion hole 24b is disposed on the front side outside the insertion recess 14b.

  Then, the swinging shaft 20 is inserted into the first insertion hole 24 a of the mounting seat 24 while the movable blade 14 is applied to the back side of the fixed blade 12. Then, a coiled spring member 22 is fitted around the swinging shaft 20 protruding from the first insertion hole 24 a, and the washer WH is swung while the spring member 22 is compressed, and the E ring 26 is placed on the upper end of the swinging shaft 20. Fit. Thus, the movable blade 14 is pressed against the fixed blade 12 by the elastic force of the spring member 22, whereby the first blade portion 12 a and the second blade portion 14 a can be brought into a meshable state.

  In the present embodiment, referring to FIG. 3, the movable blade 14 and the fixed blade 12 in a connected state are disposed on the back side of the thin plate portion 4 where the plate thickness of the set plate 2 is relatively thin. For this reason, the 1st blade part 12a and the 2nd blade part 14a can be arrange | positioned close to the workpiece | work W on the set plate 2 shown in FIG. Further, when the sewing machine MM is assembled, the movable blade 14 and the fixed blade 12 can be arranged as far as possible from the needle plate 12m, and therefore the thread trimmer 10 is arranged as much as possible without being disturbed by the configuration of the needle plate 12m. be able to. And, by the swing mechanism SM described later, the first blade portion 12a and the second blade portion 14a are engaged with each other at the base side (engagement location CP) on the back side of the insertion portion 6, thereby remaining the work W remaining. The sewing thread SEW is cut. Since the engagement portion CP of the both blade portions 12a, 14a is arranged on the narrow left side in the middle of the insertion portion 6, foreign matter does not enter from the insertion portion 6 as much as possible toward the engagement portion CP. Yes. Then, the insertion portion 6 can smoothly guide the remaining sewing thread SEW toward the thread cutting device 10.

[Oscillation mechanism]
With reference to FIGS. 10 and 11, the swing mechanism SM swings the second blade portion 14 a of the movable blade 14 back and forth around the swing shaft 20 to the first blade portion 12 a of the fixed blade 12. It is a meshing mechanism. The swing mechanism SM has a motor 30, a set collar 32, an eccentric plate 34, and a swing link 36 with reference to FIGS. 4, 5 and 8. Here, referring to FIG. 8, the motor 30 is a cubic member having a rotating shaft 30 a protruding from the center of the upper surface, and is fitted into a flat motor bracket 31. Three cylindrical spacers Misumi 31 a to 31 c are fixed to the motor bracket 31 in a standing state at a rear position of the motor 30. With reference to FIG. 4, the motor 30 is fixed to the back side of the set plate 2 via the motor bracket 31. At this time, with reference to FIG. 3, the countersunk screws CS are respectively inserted into fifth mounting holes H5 to H7 provided around the thin plate portion 4 of the set plate 2, and the shafts of the countersunk screws CS are respectively inserted. Project from the back side of the set plate 2. Referring to FIG. 4, the motor 30 is fixed to the back side of the set plate 2 by screwing the shafts of the countersunk screws CS into the upper ends of the corresponding spacer Misumi 31 a to 31 c. In this state, the rotating shaft 30a of the motor 30 is disposed on the left side and below the mounting seat 24 of the coupling mechanism JM.

  4 and 5, a set collar 32, an eccentric plate 34, and a swing link 36 are attached on the motor 30 in this order. That is, referring to FIG. 8, the rotation shaft 30 a is inserted into the center hole H of the cylindrical set collar 32, and a rectangular eccentric plate 34 is screwed onto the set collar 32. The eccentric plate 34 is provided with through holes 34a and 34b for screwing the through holes 32a and 32b on both sides of the set collar 32, and an eccentric hole 34c is provided between the through holes 34a and 34b. ing. The eccentric hole 34c is disposed at a position (on the left side in FIG. 8) away from the rotating shaft 30a of the motor 30 in a state where the eccentric plate 34 is screwed to the set collar 32. The left end of the arm-shaped swing link 36 is rotatably attached to the eccentric hole 34c via a washer WH. The left end of the swing link 36 has a ring shape, and a first stepped screw Misumi SB1 is inserted through a circular through hole 36a at the center thereof with the bush BU interposed therebetween. The shaft of the first stepped screw Misumi SB1 protruding from below the swing link 36 is inserted into the eccentric hole 34c through the washer WH.

  Referring to FIG. 4, the swing link 36 extends rightward from the eccentric plate 34, and the right end of the swing link 36 is rotatably connected to a mounting seat 24 attached to the movable blade 14. ing. At this time, referring to FIG. 8, the second stepped screw MISUMI SB2 is inserted through the second insertion hole 24b of the mounting seat 24 with the bush BU interposed therebetween. Then, the shaft of the second stepped screw MISUMI SB2 protruding from the mounting seat 24 is screwed into the right end hole 36b of the swing link 36 via the washer WH. The left end of the swing link 36 circulates around the rotation shaft 30a of the motor 30 together with the eccentric hole 34c, and the swing link 36 advances and retreats in the left-right direction accordingly. As the swing link 36 moves back and forth in the left-right direction, the mounting seat 24 swings back and forth around the swing shaft 20 together with the movable blade 14. In this way, the first blade portion 12a and the second blade portion 14a are in the expanded state of FIG. 10 with a simple mechanism that converts the rotation of the motor 30 into the swing of the movable blade 14 via the swing link 36. , It will be displaced between the meshing state of FIG.

[Tensioning device]
With reference to FIGS. 10 and 12, the pulling device 40 is a device that pulls the remaining sewing thread SEW left on the work W downward from the work W toward the thread cutting device 10. In FIG. 10, the state in which the remaining yarn material is pulled downward from the suction port 42a is shown in a state facing leftward and rearward for convenience. The tension device 40 includes a tube 42, a fixed seat 44, and a wonder gun 46 with reference to FIGS. 2 to 4. The tube 42 is a flexible tube member through which air can pass, and extends from the set plate 2 to the foot side of the biped table T. A cylindrical suction port 42a shown in FIG. 4 is fitted to the upper end of the tube 42, and a storage bag shown in FIG. 2 for storing the remaining sewing thread SEW sucked to the lower end of the tube 42. 42b is attached. The fixed seat portion 44 is a cubic member, and has a pair of screw holes 44a and 44b and a fitting hole 44c for fitting the suction port 42a with reference to FIG. The pair of screw holes 44a and 44b are formed at positions that can face the eighth mounting hole H8 and the ninth mounting hole H9 provided on the right side 2a side of the set plate 2. The wonder gun 46 is a member capable of discharging air with reference to FIG. 2, and is attached in the middle of the tube 42.

  Referring to FIG. 3, the suction port 42 a is opened on the back side of the first blade part 12 a and the second blade part 14 a while attaching the tension device 40 to the back side of the set plate 2. At this time, referring to FIG. 6, the fixed seat portion 44 is attached via the screw S of FIG. 3 inserted from the eighth attachment hole H <b> 8 and the ninth attachment hole H <b> 9 while being applied to the back surface of the set plate 2. Further, the suction port 42a is fitted into the fixing hole 44c of the fixed seat portion 44, and this suction port 42a is connected to the engagement point CP of the first blade portion 12a and the second blade portion 14a as shown in FIGS. The back side is opened so as to cover the same CP. And the air of the wonder gun 46 shown in FIG. 2 provided in the middle of the tube 42 is discharged to the accommodation bag 42b side, and the flow of the air toward the accommodation bag 42b from the suction port 42a arises. With this air flow, with reference to FIG. 11, the remaining sewing thread SEW and the like are sucked downward from the suction port 42a.

[Assembly work of the remaining thread cutting device]
Referring to FIG. 5, the remaining yarn cutting device CM is assembled to the assembling portion 14m of the head portion 2m shown in FIG. At this time, the set plate 2 is inserted into the inclined posture in which the set plate 2 is gradually inclined downward from the rear side toward the front side while the tapered front side portion 2c is applied to the front tapered surface 22m of the front wall portion 20m of the assembly portion 14m. In this state, while returning the set plate 2 to the horizontal state, the rear side portion 2d is fitted along the rear wall portion 24m of the assembly portion 14m, and the thread trimmer 10 and the tension device 40 on the back surface of the set plate 2 are connected to the head portion Place within 2m. Further, the fixing plate 8 is locked to the back side of the rear wall portion 24m of the assembly portion 14m while appropriately rotating. And the accommodation bag 42b is attached to the proper position of the biped table T, extending the tube 42 extended from the tension | pulling apparatus 40 toward the leg | foot side of the biped table T. As shown in FIG. In this way, in this embodiment, the set plate 2, the yarn cutting device 10, and the tensioning device 40 are assembled into a unit, so that the remaining yarn cutting device CM can be smoothly assembled to the sewing machine MM. In the state where the remaining yarn cutting device CM is assembled to the sewing machine MM, referring to FIG. 3, the set plate 2 is disposed adjacent to the left side of the needle plate 12m, and the opening 6a of the insertion portion 6 is provided. , Opening toward the needle plate 12m side.

[Remaining thread cutting work]
Referring to FIG. 9, at the end of sewing of workpiece W by sewing machine MM, the upper thread and lower thread (sewing thread) extending from workpiece W are cut with a thread cutting blade (not shown) on the back surface of needle plate 12m. In this type of configuration, there is a problem that a considerable length of the remaining sewing thread SEW remains on the workpiece W even after the sewing thread is cut by a thread cutting blade. Therefore, in the present embodiment, as described above, the remaining thread cutting device CM is assembled to the sewing machine MM and the remaining sewing thread SEW remaining on the workpiece W is shortened as much as possible by the remaining thread cutting device CM.

  That is, referring to FIGS. 10 and 11, the workpiece W after sewing is moved from the needle plate 12 m onto the set plate 2, and the remaining sewing thread SEW of the workpiece W is moved from the opening 6 a into the insertion portion 6. Move left while inserting. At this time, the insertion portion 6 is extended leftward toward the meshing point CP of the first blade portion 12a and the second blade portion 14a, and the opening dimension thereof is gradually narrowed as the distance from the needle plate 12m increases. ing. For this reason, the remaining sewing thread SEW can be smoothly guided to the thread trimming device 10 by the insertion portion 6. In this embodiment, the motor 30 of the yarn cutting device 10 and the wonder gun 46 of the tensioning device 40 are driven in synchronism with the operation of the yarn cutting blade and operated for a certain period. Therefore, the first blade portion 12a and the second blade portion 14a are displaced many times between the expanded state in FIG. 10 and the meshed state in FIG. 11 while air is sucked from the suction port 42a. Therefore, the remaining sewing thread SEW remaining on the workpiece W inserted into the insertion portion 6 is pulled from the workpiece W toward the thread trimmer 10 by the tension device 40 as shown in FIG. It will cut | disconnect in the meshing location CP of the part 12a and the 2nd blade part 14a (it cut | disconnects many times depending on the case). In this way, in the present embodiment, the remaining sewing thread SEW can be shortened as much as possible by cutting the remaining sewing thread SEW remaining on the workpiece W while pulling. Furthermore, since the tension device 40 is configured to suck air downward from the suction port 42a, foreign matter (not shown) such as fiber scraps generated from the remaining sewing thread SEW while suitably pulling the remaining sewing thread SEW. Can be removed by suction.

  As described above, in the present embodiment, the remaining sewing thread SEW remaining on the workpiece W can be shortened as much as possible by cutting it while pulling. At this time, while the remaining sewing thread SEW is preferably sucked and pulled by the pulling device 40, foreign matter such as fiber waste generated from the remaining sewing thread SEW can be sucked and removed. Further, the remaining sewing thread SEW is cut by the thread cutting device 10 in the middle of the insertion portion 6 extending in the left direction away from the needle plate 12m. Therefore, the thread trimming device 10 can be arranged as far as possible from the needle plate 12m, and the remaining sewing thread SEW can be smoothly guided toward the thread trimming device 10 by the insertion portion 6. At this time, by providing a portion (engagement portion CP) where the remaining sewing thread SEW is cut in a relatively narrow portion of the insertion portion 6, various foreign substances can enter the cut portion (engagement portion CP). It can be suitably avoided. Further, since the remaining sewing thread SEW is cut by the thread trimmer 10 in the insertion portion 6 provided in the thin plate portion 4 having a relatively thin plate thickness, the thread trimmer 10 is brought as close as possible to the set plate 2 side. In this state, the remaining sewing thread SEW can be cut. For this reason, according to the present embodiment, the remaining sewing thread SEW remaining on the work W after sewing can be made shorter without much trouble as much as possible.

  Furthermore, in this embodiment, since the set plate 2, the thread trimming device 10 and the tensioning device 40 are assembled and unitized, the configuration of the remaining thread cutting device CM is made compact and smooth with respect to the sewing machine MM. Can be assembled. By attaching the remaining thread cutting device to the sewing machine MM, the remaining sewing thread SEW remaining on the workpiece W can be shortened more smoothly after the workpiece W is sewn.

[Modification]
Here, the configuration of the thread trimming device may take various configurations in addition to the above-described configuration. For example, referring to FIG. 13, the thread cutting device 10 of this modification is different from the thread cutting device of the embodiment in that it has a clipper-shaped fixed blade 12X and a movable blade 14X. That is, the thread cutting device 10 has a fixed blade 12X provided with a plurality of blade portions on the right side and a movable blade 14X provided with a plurality of blade portions on the right side. Each blade portion of the fixed blade 12X is a substantially triangular portion when viewed from above, and the plurality of blade portions are arranged in parallel in the front-rear direction. Each blade portion of the movable blade 14X is also a substantially triangular portion as viewed from above the blade portions of the fixed blade 12X, and the plurality of blade portions are arranged in parallel in the front-rear direction. Therefore, by sliding the movable blade 14X back and forth on the back surface of the fixed blade 12X, each blade portion of the fixed blade 12X can be engaged with the corresponding blade portion of the movable blade 14X. In the present modification, a plurality of blade portions of the fixed blade 12X and a plurality of blade portions of the movable blade 14X are provided on the front and rear, so that even if the remaining sewing thread SEW is slightly shifted back and forth, the blade portion of the fixed blade 12X is movable. It is surely cut by any one of the blade portions of the blade 14X. In this modified example, a disk-shaped or fan-shaped fixed blade and a movable blade can be used. In this case, the movable blade rotates around the shaft cloth provided at the center or the left end. In this modification, the fixed blade 12X and the movable blade 14X (two blades) are used, but at least one of the fixed blade 12X and the movable blade 14X can be provided.

  The remaining yarn cutting device CM of the present embodiment is not limited to the above-described embodiment, and can take various other embodiments. In the present embodiment, the configuration (shape, dimension, assembly position, constituent members, etc.) of the remaining yarn cutting device CM is exemplified, but the configuration of the device is not intended to be limited. For example, the set plate can be assembled at an appropriate position of the sewing machine. Further, the set plate, the thread trimming device, and the tensioning device can be separately assembled to the sewing machine (can be configured so as not to be unitized). Further, at least two of the set plate, the thread trimming device, and the tensioning device can be unitized.

  Moreover, in this embodiment, although the structure of the thread trimming apparatus 10 and the tension | pulling apparatus 40 was illustrated, it is not the meaning which limits the structure of each apparatus. For example, the thread trimming device can be configured to burn off the remaining sewing thread using heat rays or a laser, or to disassemble and cut the sewing thread by applying a chemical. The tensioning device can be configured to pull the remaining sewing thread using a fluid such as gas or liquid. In addition to the structure for sucking the remaining sewing thread, the tensioning device can be configured to pull the remaining sewing thread by pushing it toward the thread cutting device with a fluid. The thread trimming device and the tensioning device can be operated in conjunction with each other (independent of the thread trimming blade). Further, the thread trimming device and the tensioning device can be operated in conjunction with the raising / lowering operation of the sewing needle or the presser foot.

  Moreover, in this embodiment, although the structure of the set plate 2 was illustrated, it is not the meaning which limits the structure of the same member. For example, the insertion portion can be configured as a through hole. In this case, the insertion portion can be a round hole, a square hole, or a long hole into which the remaining sewing thread can be inserted. Moreover, various shapes, such as triangular shape or linear shape, can be taken as a shape of an insertion part. Moreover, although the triangular shape by which the opposing side was made into the straight line was illustrated as a triangular insertion part, the opposing side may be made into the curved shape convex in the direction which approaches mutually, or leaves | separates, the opposing side May be stepped or zigzag shaped. Further, the entire set plate can be made thin overall as a plate thickness T2, and the plate thickness of the entire set plate can be set as T1 and no thin plate portion can be provided. Further, the insertion portion can be provided at an appropriate position on the set plate. As a method of assembling the thread trimming device and the tensioning device with respect to the set plate, various methods can be used besides screws and screws.

  In the present embodiment, the cloth material is exemplified as the workpiece W, but the type of the workpiece is not limited. In addition, the workpiece | work as a cloth material can be used as a skin of various vehicle interior goods, such as a seat cover of a vehicle seat. The configuration of the sewing machine can be changed as appropriate.

W Work SEW Remaining sewing thread T Biped table MM Sewing machine 2m Head part 4m Leg column part 6m Arm part 8m Sewing needle 10m Presser foot 12m Needle plate 13m Needle hole 14m Assembly part 15m Feed dog 16m Pot 20m Front wall part 22m Front taper Surface 24m Rear wall portion 26m Rear taper surface CM Remaining thread cutting device 2 Set plate 2a Right side portion 2b Left side portion 2c Front side portion 2d Rear side portion 4 Thin plate portion 6 Insertion portion 6a Opening portion 6b Left end portion 8 Fixing plate 10 Thread cutting device 12 Fixed blade 12a First blade portion 14 Movable blade 14a Second blade portion 14b Insertion recess JM Linking mechanism 20 Oscillating shaft 20a Axle pin 22 Spring member 24 Mounting seat 24a First insertion hole 24b Second insertion hole 26E Ring SM Oscillating mechanism 30 Motor 30a Rotating shaft 31 Motor brackets 31a to 31c Spacer MISUMI 32 Set collar 34 Eccentric plate 4c Eccentric hole 36 Oscillating link 36a Circular through hole 36b Hole 40 Pulling device 42 Tube 42a Suction port 42b Housing bag 44 Fixed seat 46 Wonder gun BS Screw BU Bush CS Countersunk screw NT Nut S Screw SB1 First step screw Misumi SB2 Threaded Misumi WH Washer CP with 2nd Step (Matching point between 1st blade and 2nd blade)

Claims (7)

In the remaining thread cutting device that cuts the remaining sewing thread remaining on the workpiece after sewing with the sewing machine,
A set plate that can be assembled to the sewing machine, an insertion part that can penetrate the set plate in the thickness direction and insert the remaining sewing thread, and a thread trimmer provided on the back side of the insertion part, A tension device that pulls the remaining sewing thread from the workpiece toward the thread trimming device, and the remaining sewing thread inserted into the insertion portion is pulled by the tension device to the thread trimming device. The remaining yarn cutting device is configured to be cut by cutting.   The residual thread cutting device according to claim 1, wherein the tensioning device sucks the remaining sewing thread from the workpiece toward the thread cutting device.   The residual yarn cutting device according to claim 1 or 2, wherein the set plate, the yarn cutting device, and the tensioning device are assembled into a unit.   The set plate can be assembled adjacent to the needle plate of the sewing machine, and the insertion portion extends in a direction away from the needle plate in a state where the set plate is assembled to the sewing machine. The remaining thread cutting device according to any one of claims 1 to 3, wherein the remaining sewing thread is cut by the thread cutting device in the middle of the insertion portion.   The insertion portion has an opening that opens at an edge on the needle plate side of the set plate, and is gradually narrowed as the distance from the opening increases and closes at the end, and the opening size is larger than the opening. The remaining thread cutting device according to claim 4, wherein the remaining sewing thread is cut by the thread cutting device at a portion where is narrowed.   The set plate is provided with a thin plate portion having a smaller thickness dimension than other portions of the set plate. In the insertion portion provided in the thin plate portion, the remaining portion is removed by the thread cutting device. The remaining thread cutting device according to any one of claims 1 to 5, wherein the sewing thread is cut. A sewing machine to which the remaining yarn cutting device according to any one of claims 1 to 6 is assembled.

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