JP2006142094A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the structure of a sewing machine by making a thread end completely passed through a needle hole, removing a thread loop created at the time of passing the thread through the needle hole. <P>SOLUTION: This multi-headed sewing machine is provided with a thread passing mechanism 33 in which a thread passing hook 83 makes a thread passed through a hole 15a of a needle 15, and a thread pulling mechanism 32 including a thread pulling member 62 which pulls the end of a thread T coming downward through the hole 15a of the needle 15 completely out of it. The thread pulling mechanism 32 is designed to remove a thread loop L by pulling a loop thread passing through the hole 15a of the needle 15 by the thread passing hook 83 by using the thread pulling member 62. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sewing machine, and more particularly to a sewing machine that can automatically eliminate a thread loop formed during threading.

  Conventionally, there has been proposed a sewing machine including a threading means that can automatically thread a sewing needle. For example, in Patent Document 1, in a state in which a thread is guided by a thread guide groove and held by a thread holding portion or the like, the thread is captured by a hook that is inserted into a stitch hole of a sewing needle, and the hook is pulled out. A technique for passing the upper thread through the eye hole is described. Japanese Patent Application Laid-Open No. 2004-228561 describes a thread pulling means that, after thread trimming operation such as when sewing is finished, can remove the end of the cut thread from the cloth and guide it with a thread clamp.

JP-A-8-173676 (pages 3-6, FIGS. 1-6) JP-A-6-254279 (pages 3 to 5, FIGS. 1 and 2) Japanese Patent Laid-Open No. 51-24353 (2-4 pages, all figures)

  However, in the sewing machine disclosed in Patent Document 1, the thread passed through the eye of the sewing needle forms a loop between the eye hole and the hook, and the operator pulls the looped thread to thread the free end side thread. Threading was performed by pulling it out from the eye hole. Therefore, in Patent Document 3, the second thread clamper captures the thread of the first thread clamper that has been held at the time of sewing by the second thread clamper, and the second thread clamper includes a thread that has been broken during sewing. The captured thread is passed through the eye of the sewing needle by the thread pusher, and further, the third thread clamper captures the thread that has passed through the hole, and the third thread clamp rises to completely thread the thread. Techniques for passing through eye holes are described. However, the sewing machine of Patent Document 3 is provided with three thread pincers for capturing the thread passed through the eye holes and pulling out the thread, and each of them is moved differently, so the structure of the sewing machine is very It becomes complicated.

  An object of the present invention is to simplify the structure of the sewing machine by eliminating the thread loop formed at the time of threading by the thread pulling means and completely passing the thread through the eye of the sewing needle.

  The sewing machine according to claim 1, wherein the thread pulling means includes threading means for threading through the threaded hole of the sewing needle with a threading hook, and thread pulling member for threading the thread extending downward through the threaded hole of the sewing needle. In the sewing machine, the thread pulling means is configured so that the thread loop can be eliminated by pulling the loop-shaped thread threaded through the threaded hook by the thread pulling hook with the thread pulling member. It is.

  According to this sewing machine, the threading means removes the threading hook on which the thread has been hung by the operator from the eye of the sewing needle, so that the thread is passed through the eye of the sewing needle by the threading hook. By pulling the thread formed in a loop shape through the eye hole with the thread pulling member, the thread loop is automatically eliminated, and the thread is completely threaded so that it can be sewn into the eye hole of the sewing needle.

  According to the sewing machine of the first aspect, the yarn loop is eliminated by the yarn pulling means, thereby reducing the number of parts of the sewing machine, simplifying the structure of the sewing machine and reducing the manufacturing cost of the sewing machine, and reliably It is possible to pass the sewing needle through the eye of the sewing needle so that the labor and time of the operator can be saved.

Embodiments of the present invention will be described. This embodiment is an example in which the present invention is applied to an industrial or professional multi-head sewing machine that includes three multi-needle embroidery sewing machines and can simultaneously sew three identical embroidery patterns to a hat.
First, the multi-head sewing machine M will be described. Note that the direction in which the worker is located is defined as the front, and the left, right, and up and down directions viewed from the worker are defined as the left, right, and top. As shown in FIG. 1, the multi-head sewing machine M includes an embroidery machine body frame 1 extending in the left-right direction, and a substantially rectangular sewing machine support plate extending in the left-right direction disposed on the rear side of the upper surface of the embroidery machine body frame 1. 2, three multi-needle type embroidery sewing machines M <b> 1 to M <b> 3 having the same structure are arranged in a line in the left-right direction on the sewing machine support plate 2.

  At the front end portion of the head portion 4 provided at the distal end portion of each arm portion 3 of the three embroidery sewing machines M1 to M3, a needle bar case 5 that supports six needle bars 10 so as to be movable up and down is left and right. It is arranged to be movable in the direction. On the other hand, a leg column 6 is connected to the arm 3, and a bed main body 7 connected to the lower end of the column 6 is fixed on the sewing machine support plate 2. A cylinder bed 8 extends forward from the front end of the bed main body 7, and a thread catcher (not shown) or the like is provided at the front end of the cylinder bed 8. An operation panel 9 for an operator to perform various operations is also provided at the right end of the multi-head sewing machine M.

  As shown in FIGS. 3 and 4, each head portion 4 includes a needle bar case 5, an elevating drive mechanism 30 that transmits a vertical driving force from the sewing machine motor 110 (see FIG. 12) to the needle bar 10, Needle bar release mechanism 31 for cutting off transmission of driving force between needle bar 10 and elevating drive mechanism 30, thread pulling mechanism 32 including thread pulling member 62, and threading hook 83 through the eye of sewing needle 15. A threading mechanism 33 for threading is provided.

  As shown in FIGS. 2 and 3, each needle bar case 5 includes six needle bars 10 extending in the vertical direction and six balances mounted so as to be swingable at positions corresponding to the needle bars 10. 11, a first needle bar guide member 12 and a second needle bar guide member 13 that are fixed to the needle bar case 5 and guide the needle bar 10, and a fixing plate 17 that extends in the left-right direction and is fixed to the needle bar case 5 at both ends. The first thread holding member 14 supported by the second thread holding member 14, the second thread holding member 16 provided so as to correspond to the respective sewing needles 15, the presser foot 24, and the like are provided.

  A connecting member 18 having a connecting pin 18a to which a driving force from the elevating drive mechanism 30 is transmitted is fixed to the center portion of the needle bar 10, and between the connecting member 18 and the first needle bar guide member 12, A compression spring 19 that biases the needle bar 10 upward is fitted on the needle bar 10. A sewing needle 15 is attached to the lower end of each needle bar 10, and an embroidery thread T is supplied to each of the six sewing needles 15 from a thread stand 21 of a thread stand 20. The first yarn holding member 14 is for holding the yarn T drawn by the yarn drawing mechanism 32, and holds the yarn in which the hook surfaces of two hook-type Magjik tapes (registered trademark) face each other and overlap each other. It has the tape 14a and the reinforcement board 14b which clamps the thread | yarn holding tape 14a.

  The second thread holding member 16 temporarily holds the thread end of the thread T hung on the threading hook 83 before threading the thread T through the eye hole 15a of the sewing needle 15 during threading. A holding portion 16b for holding the thread T cut by the blade portion 16a, and a guide portion 16c for guiding the yarn T to the holding portion 16b with the tip thereof being caused to move forward. The thread T is passed from the right to the left to the rear side of the guide portion 16c, and when the yarn T is guided to the blade portion 16a, the yarn T is pulled to the lower side of the front side to cut the yarn T by the blade portion 16a. The thread T is clamped between the holding portion 16b and the front surface of the needle bar case 5 to hold the yarn end.

  When one needle bar 10 is selected by moving the needle bar case 5 to the left and right to switch one desired sewing needle 15 to a sewing position facing a needle hole (not shown) at the tip of the cylinder bed 8, The rotational driving force of the motor 110 is transmitted to the lifting / lowering driving mechanism 30 as the driving force in the vertical direction by the driving shaft 22, the V belt 23, etc., and the needle bar 10 is driven to swing up and down by the vertical driving of the lifting / lowering driving mechanism 30. The balance 11 corresponding to the needle bar 10 is also driven to swing up and down, and a stitch is formed with the thread T of the color selected by the cooperation of the sewing needle 15 of the needle bar 10 and the thread catcher.

  As shown in FIGS. 3, 5, and 6, the elevating drive mechanism 30 is supported by a base needle bar 35 provided in parallel with the needle bar 10, and slidably and non-rotatably supported by the base needle bar 35. The drive member 36, the transmission member 37 supported so as to be vertically movable together with the drive member 36 and rotatably with respect to the base needle bar 35, one end abutting the drive member 36 and the other end abutting the transmission member 37 The transmission member 37 includes a first winding spring 38 that urges the needle bar 10 to a transmission position where the driving force can be transmitted.

  The drive member 36 includes an upper drive member 36a and a lower drive member 36b that are externally fitted to the base needle bar 35, and a connecting portion 36c that connects them. The first drive spring 38 is externally attached to the upper drive member 36a. A stopper 39 for restricting the rotation of the transmission member 37 at a predetermined angle is fixed to the left side surface of the lower drive member 36b.

  The transmission member 37 is mounted between the upper drive member 36a and the lower drive member 36b, and the first and second engagement members 40 and 41 for engaging the connecting pin 18a, and the needle from the needle bar release mechanism 31. And a contact post 42 to which a rotational driving force for releasing the rod 10 is transmitted. The first engagement member 40 has an inclined portion 40a for rotating the transmission member 37 in the direction of arrow A in FIG. 6 when the released connection pin 18a contacts.

  The needle bar release mechanism 31 is a pulse motor, which is a drive motor 46 mounted on a fixed member 45, a sector gear 47 meshed with an output shaft 46a of the drive motor 46, and a guide pin 49a fixed to the fixed member 48. , 49b and a guided plate 50 mounted so as to be movable in the vertical direction, a first link member 51 having a lower end connected to the center of the guided plate 50 so as to be swingable, and a first link member The second link member 52 is swingably connected to the upper end of 51, the contact member 53 swings together with the second link member 52, the stopper 54 fixed to the fixing member 48, and the like. The lower end portion of the front half of the sector gear 47 is in contact with the contact pin 55 fixed to the lower end portion of the guided plate 50. The fixing members 45 and 48 are fixed to the left sewing machine frame 56.

  The contact member 53 is rotatably supported by the fixed member 48 and is fixed to the second link member 52 by a screw 57 and a first contact that contacts the contact column 42 of the transmission member 37. And a second abutting portion 53 c that abuts against the stopper 54. A second winding spring 59 fixed to a screw 58 having one end screwed to the fixing member 48 is fitted on the right end portion of the shaft portion 53a, and the contact member 53 is not used except when the needle bar 10 is jumped. Is urged in the direction of arrow C shown in FIG. 3 by the second winding spring 59, and the second contact portion 53 c is in contact with the stopper 54.

  When the needle bar release mechanism 31 causes the needle bar 10 to jump and release, the drive motor 46 is driven to rotate the sector gear 47 in the direction of arrow D in FIG. Move. The lower end of the first link member 51 is moved downward by the movement of the guided plate 50, and the second link member 52 is moved together with the contact member 53 in the direction opposite to the arrow C around the axis of the shaft portion 53a. Rotate. The contact member 53 presses the contact column 42 of the transmission member 37 in contact with the first contact portion 53b by this rotation, and the transmission member 37 is shown until the contact column 42 contacts the stopper 39. 6 is rotated in the direction of arrow A (see the abutment column 42 shown by a two-dot chain line in FIG. 6). By this rotation, the engagement between the first and second engaging members 40, 41 and the connecting pin 18a is released, so that the needle bar 10 is urged by the compression spring 19 to jump to the upper limit position, and the lifting drive mechanism The 30 lifting drive force is not transmitted to the needle bar 10 and is released.

  Conversely, in order to change from the released state to the transmission state in which the lifting drive force of the lifting drive mechanism 30 can be transmitted, the transmission member 37 is driven upward by the sewing machine motor 110 and the connecting pin 18a is applied to the inclined portion 40a from above. By making contact, the transmission member 37 rotates in the direction of arrow A in FIG. 6, and when the transmission member 37 is further raised and the connecting pin 18 a is positioned between the first and second engagement members 40, 41, The transmission member 37 is rotated in the direction of arrow B by the urging force of the winding spring 38, and the connecting pin 18a engages with the first and second engagement members 40 and 41 to enter the transmission state.

  The thread pulling mechanism 32 wipes the thread T extending downward through the eye hole 15a of the sewing needle 15 at the end of sewing or changing the needle, and passes through the eye hole 15a of the sewing needle 15 when threading. This is for eliminating the loop-like thread loop L hung on the threading hook 83.

  As shown in FIGS. 3, 5, and 6, the thread drawing mechanism 32 includes a drive motor 46, a sector gear 47 in which the detected body 60 is formed, and a thread drawing member for detecting the detected body 60. An origin detector 61, a thread pulling member 62, a connecting plate 63 that is swingably connected to the thread pulling member 62 and the sector gear 47 at both ends, a guide member 64 that guides the thread pulling member 62, and a guide member 64 And a lid member 65. The yarn pulling member 62 has a standing portion 62a that is swingably connected to the connecting plate 63, and a hook-like hook portion 62b for pulling the yarn T, and is held between the guide member 64 and the lid member 65. The guide member 64 is slidably supported in the guide groove 64a. The yarn pulling member origin detector 61 is a photo interrupter including a light receiving element and a light emitting element, and the yarn pulling when the edge of the lower end of the detected body 60 passes between the light receiving element and the light emitting element. The position of the member 62 is detected as the origin position. The guide groove 64 for guiding the thread pulling member 62 is arranged so that the thread pulling member 62 is moved to the position shown in FIGS. 4 and 6 when the drive motor 46 is rotated in the direction of arrow D to drive the needle bar releasing mechanism 31. It is formed to be able to move further backward from the standby position shown.

  In the yarn pulling mechanism 32, when the yarn is wiped, the sector gear 47 to which the driving force is transmitted from the driving motor 46 rotates in the direction of arrow E shown in FIG. 3, and the connecting plate 63 is driven forward and downward along with the rotation. The thread pulling member 62 connected to the lower end of the connecting plate 63 passes through the first thread holding member 14 while being guided by the guide groove 64a, and reaches the thread dispensation position where the hook 62b reaches below the sewing needle 15. The hook portion 62b is engaged with the thread T that slides and extends downward through the eye hole 15a (see the two-dot chain line shown in FIG. 3). When the yarn pulling member 62 is returned to the standby position in this state, the yarn T engaged with the yarn pulling member 62 passes between the first yarn holding members 14 so that the yarn T is in the first yarn holding member 14. Is held by the yarn holding tape 14a.

  4 and 5, the threading mechanism 33 includes a threading motor 70 that is a pulse motor, and guide pins 72a that mesh with the output shaft 70a of the threading motor 70 and are fixed to the right sewing machine frame 73. 72b is connected to a rack 71 engaged with the guide groove 71a, one end connected to a connecting pin 74 fixed to the lower end of the rack 71, and the other end connected to a connecting protrusion 75 fixed to the guide frame 77. A tension spring 76 that urges 71 upward, a guide frame 77 that is fixed to the right sewing machine frame 73 and formed with a guide groove 77 a, and a connecting pin 74 that is positioned on the right side of the guide frame 77 at the lower end of the rack 71. Via a first guide pin 79 engaged with a guide groove 77a at a lower end portion of the crank plate 78, and a guide frame that is swingable. A pair of left and right thread hooking members 81 having a rectangular parallelepiped link block 80 connected to the left side of 77 and inclined portions 81 a and 82 a that are fixed to the tip of the link block 80 and guide the thread T to the threading hook 83. , 82 and a pair of thread hooking members 81, 82, and a threading hook 83 having a hook portion 83 a on which the thread T is hooked, and a threading hook for detecting the position of the threading hook 83 And a detector 111 (see FIG. 12).

  A second guided pin 84 engaged with the guide groove 77 a is fixed to the center portion of the link block 80. The guide groove 77a has an inclined portion 77b and a horizontal portion 77c, and guides the link block 80 downward and forward first when threading, and then guides it forward in the horizontal direction.

  Next, threading by the thread drawing mechanism 32 and the threading mechanism 33 will be described. First, from the state where both the threading hook 83 and the thread pulling member 62 shown in FIG. 7 are in the standby state, the rack 71 is moved downward while being guided by the guide pins 72 a and 72 b by the threading motor 70, and is connected to the rack 71. The crank plate 78 and the link block 80 connected to the crank plate 78 first move downward and forward along the inclined portion 77b of the guide groove 77a, and then move forward in the horizontal direction along the horizontal portion 77c. To do. As shown in FIGS. 4 and 9, the link block 80 moves until the hook portion 83a of the threading hook 83 passes through the eye hole 15a of the sewing needle 15, and the second guided pin 84 moves to the front end portion of the guide groove 77a. Stops at the thread hooking position in contact with.

  Next, as shown in FIGS. 2 and 4, the operator hooks the thread T guided by the thread guides 85, 86 and the like from the right onto the thread hooking members 81, 82, and holds the thread T on the second thread. The blade 16 is cut by the blade portion 16a of the member 16, and the free end portion of the thread T is sandwiched and held between the holding portion 16b and the front surface of the needle bar case 5. At this time, as shown in FIGS. 9 and 10, the operator pulls the yarn T hung on the yarn hooking members 81 and 82 upward, so that the yarn T is inclined by the inclined portions 81 a and 81 b of the yarn hooking members 81 and 82. It is guided to the threading hook 83 by 82a and hooked on the hook portion 83a.

  Next, the threading hook 83 is separated by a predetermined distance rearward by the threading motor 70 and stopped at the loop release position located on the rear side of the sewing needle 15. Next, as shown in FIG. 8, the threading member 62 is inserted into the thread loop L by the drive motor 46 and the thread pulling position is below the thread loop L. The free end F of the yarn loop L is engaged with the hook portion 62b by moving along the locus. This yarn pulling position is located above the yarn wiping position and has a shorter moving distance than the yarn wiping.

  At this time, the free end of the yarn T is in a state where the yarn holding of the second yarn holding member 16 is released, the tension of the yarn T is loosened, and the yarn loop L is engaged with the threading hook 83, which is shown in FIG. Thus, the thread loop L between the threading hook 83 and the eye hole 15a does not hang downward, and the width in the left-right direction is increased. Further, as shown in FIG. Since the thread loop L is substantially perpendicular to the thread pulling member 62 because it is positioned below the eye hole 15a of the sewing needle 15, the thread pulling member 62 reliably passes between the thread loops L and is engaged with the thread T. Can be combined.

  Next, when the thread pulling member 62 is returned to the standby position by the drive motor 46, the free end side F of the thread loop L held between the threading hook 83 and the eye hole 15a of the sewing needle 15 is pulled. The thread loop L is eliminated by detaching from the eye hole 15a and also from the threading hook 83, and the thread pulling member 62 passes through the first thread holding member 14 while pulling the free end side F of the thread T. Thus, the yarn T is held by the yarn holding tape 14 a of the first yarn holding member 14. Then, the thread T is completely threaded through the eye hole 15a. Next, the threading hook 83 is returned to the standby position by the threading motor 70, and the threading is completed.

  The operation panel 9 is used for inputting various commands relating to sewing and the like, and includes an input means 91 having a display 90 and a threading switch 92 (see FIG. 12), a flexible disk drive 93 (FDD), and the like. ing. The threading switch 92 inputs a command for operating the threading mechanism 33 and inputs a command for causing the thread drawing mechanism 32 to cancel the thread loop L.

  Next, the control unit 100 including the computer 101 will be described based on the block diagram of FIG. The control unit 100 governs overall control of the embroidery sewing machines M1 to M3 such as the threading mechanism 33 and the thread drawing mechanism 32. The control unit 100 includes a CPU 102, a ROM 103, a RAM 104, a computer 101 including a bus 105 for connecting them, an input / output interface 106 for inputting / outputting to / from the computer 101, and a sewing machine connected to the input / output interface 106. A drive circuit 107 for the motor 110, a drive circuit 108 for the drive motor 46, and a drive circuit 109 for the threading motor 70 are included.

  The input / output interface 106 is also connected with a thread drawing member origin detector 61 for detecting the position of the thread drawing member 62 and a threading hook detector 111 for detecting the position of the threading hook 83. In the ROM 103, a threading control program for driving the driving motor 46 and the threading motor 70 to perform threading is recorded in a readable manner. The RAM 104 stores various data such as position data received from the thread drawing member origin detector 61, the threading hook detector 111, and the like.

  Next, a threading control program that is executed by the computer 101 of the control unit 100 to thread the eye 15a of the sewing needle 15 will be described with reference to the flowchart of FIG. Si (i = 10, 11,...) Indicates a step number.

  When the operator operates the threading switch 92 of the operation panel 9 and inputs a command (S10), if the sewing is stopped (S11; Yes), the command is input from the computer 101 to the drive circuit 109, and the threading motor. 70 drives the threading hook 83 and detects the position of the threading hook 83 by the threading hook detector 111 while moving the threading hook 83 in the direction of the thread hooking position (S12). Is moved to the threading position (S13; Yes), the threading motor 70 is stopped with the threading hook 83 passing through the eye 15a of the sewing needle 15 (S14).

  Next, when the operator hangs the thread T on the threading hook 83 and the threading switch 92 is operated again to input a command (S15; Yes), the computer 101 responds to the command by the drive circuit 109. Is input, the threading motor 70 is driven, and the position of the threading hook 83 is detected by the threading hook detector 111, and the threading hook 83 is removed from the eye hole 15a and moved toward the loop canceling position. When the threading hook 83 is moved to the loop release position moved by a predetermined distance (S17; Yes), the threading motor 70 is stopped (S18).

  Next, a command is input from the computer 101 to the drive circuit 108, the drive motor 46 is driven, the sector gear 47 is rotated in the direction of arrow E, and the thread drawing member 62 is moved in the direction of the origin position (S19). When the origin position of the thread drawing member 62 is detected by the thread drawing member origin detector 61 (S20), a predetermined number of pulses are sent from the origin position to the drive motor 46 to move the thread drawing member 62 to the thread drawing position. (S21) The free end side F of the thread loop L extending from the threading hook 83 to the eye hole 15a is engaged with the hook portion 62b of the thread pulling member 62, and the drive motor 46 is stopped. The drive motor 46 is driven to return the thread pulling member 62 engaged with the thread loop L to the standby position to cancel the thread loop L (S22), and the threading motor 70 is driven to wait for the threading hook 83. Is moved to the position, the threading control program is ended.

  Next, the effect of the multi-head sewing machine M described above will be described.

  According to the multi-head sewing machine M, the thread pulling member 62 of the thread wiper mechanism 32 for threading when changing the thread or the like is moved to the thread pulling position so that the eye 15a of the sewing needle 15 is threaded when threading. Since the thread loop L formed between the threading hook 83 and the threading hook 83 is eliminated, the number of parts of the multi-head sewing machine M is reduced, the structure of the multi-head sewing machine M is simplified, and the manufacturing cost of the multi-head sewing machine M is also reduced. Thus, the thread T can be passed through the eye hole 15a of the sewing needle 15 in a state where the thread T can be reliably sewed, and unnecessary labor and time of the operator can be saved.

  When the thread pulling member 62 engages with the thread loop L, the thread loop L does not hang downward and is held between the eye hole 15a of the sewing needle 15 and the threading hook 83. Since the tip of the threading hook 83 is located below the eye hole 15a, the yarn pulling member 62 is almost perpendicular to the yarn loop L, and the yarn holding of the second yarn holding member 16 is eliminated. Since the tension of the yarn loop L is loosened and the yarn pulling member 62 passes through the yarn loop L in a state where the yarn loop L spreads left and right, the yarn pulling member 62 is reliably engaged with the yarn loop L. be able to. Since the yarn pulling member 62 engages and pulls on the free end side F of the yarn loop L, the yarn T can be smoothly pulled out from the eye hole 15a without pulling out the useless yarn T from the yarn stand 21.

  Since the moving distance of the yarn pulling member 62 when the yarn loop L is eliminated is shorter than the movement distance when the yarn is wiped, it is not necessary to increase the size of the drive motor 46 in order to eliminate the yarn loop L. . Since the movement trajectory of the yarn pulling member 62 is the same at the time of thread wiping and the cancellation of the loop, there is no need for a complicated mechanism for moving the yarn pulling member 62 along a complicated movement trajectory to eliminate the loop. The structure of the formula sewing machine M can be simplified.

  Next, a modified embodiment in which the above-described embodiment is partially modified will be described.

  1) In the above-described embodiment, the present invention is applied to the embroidery sewing machines M1 to M3 provided with the needle bar case 5 in which the plurality of sewing needles 15 and the needle bar 10 are provided in one head portion 4. You may apply to the sewing machine provided with one sewing needle in one head part.

  2) In the above-described embodiment, the present invention is applied to the multi-head sewing machine M including a plurality of embroidery sewing machines M1 to M3. However, the present invention may be applied to a single-head sewing machine including a single sewing machine. Good.

  3) In the above-described embodiment, the present invention is applied to the industrial or professional multi-head sewing machine M. However, the present invention may be applied to an individual household sewing machine.

  4) In the embodiment described above, the elevating drive mechanism 30 and the driving force transmitting means for moving the cloth moving mechanism and the sewing needle 15 up and down are configured to be non-separable, but as shown in Japanese Patent No. 3178822. In addition, the cloth moving mechanism may be configured to be separable from the elevating drive mechanism and the driving force transmitting means.

  5) In the above-described embodiment, the positions of the threading hook 83 and the thread pulling member 62 are located rearward with respect to the sewing needle 15. However, as long as there is no hindrance to the sewing operation and the attachment / detachment of the sewing object, the threading hook And / or one of the thread pulling members may be provided in front of or on the side of the sewing needle.

  6) In the above-described embodiment, the thread pulling member 62 passes through the thread loop L and engages with the thread T while the threading hook 83 and the thread T are engaged. The yarn pulling member may be configured to engage with the yarn loop in a state where the engagement between the yarn and the yarn is released.

  7) In the embodiment described above, the yarn T is held between the yarn holding tapes 14a of the first yarn holding member 14, but the yarn does not move inadvertently, and the first yarn holding member is used during sewing. As long as the holding of the yarn can be appropriately eliminated, the yarn may be held by simply placing the yarn on the member. Further, at the start of sewing, the first thread holding member 14 does not operate, and the thread holding is canceled by the sewing needle 15 pulling the thread T held by the first thread holding member 14. The holding member may be configured to positively cancel the yarn holding by an actuator or the like.

  8) In the above-described embodiment, the yarn pulling member 62 reciprocates along a linear path, but the sewing machine is configured to reciprocate along an arcuate path or move along only one direction. Also good. In the above-described embodiment, although the movement distance of the yarn pulling member 62 is different between the operation during threading and the movement during thread wiping, the linear path is the same, but the linear path is the same. It may be changed between threading and thread wiping.

  9) In the above-described embodiment, the present invention is applied to the multi-head sewing machine M in which an operator is positioned in front of FIG. 1, but the right or left side in FIG. The present invention may be applied to a sewing machine where an operator is located. In such a sewing machine, since the position of the operator changes, for example, the thread is different from the above-described embodiment so that the path of the threading hook or the thread pulling member moves toward the operator. It is desirable that the threading hook and the thread pulling member move.

  10) In the above-described embodiment, the present invention is applied to the multi-head type sewing machine M for moving and sewing a workpiece with a cylindrical cap frame device. However, the workpiece is to be sewn with a flat embroidery frame. The present invention may be applied to a sewing machine that moves and sews. Further, the sewing product may be configured to be movable without a embroidery frame by a feed dog, a feed roller, or an operator manually.

  11) In the embodiment described above, as shown in FIG. 11, the free end side F of the thread loop L is located on the left side with respect to the sewing needle 15, so that the hook portion 62b of the thread pulling member 62 opens on the left side. However, the free end side of the thread loop may be positioned on the right side with respect to the sewing needle, and the hook portion of the thread pulling member may be configured to open on the right side.

  12) Although the pulse motor is used as the drive motor 46 in the above-described embodiment, other types of motors, solenoids, air cylinders, and the like may be used as the drive motor.

  13) The recording medium for recording the threading control program is not limited to the ROM, and a flexible disk or a CD-ROM may be used as the recording medium.

  14) The multi-head sewing machine M described above includes the bed 7 having the cylindrical cylinder bed 8, but may be a flat bed.

  The present invention is not limited to the above-described embodiment, and those skilled in the art will implement various modifications to the above-described embodiment without departing from the spirit of the present invention. Therefore, the present invention includes such modified forms.

1 is an overall view of a multi-head sewing machine according to an embodiment of the present invention. It is a front view of a needle bar case. It is a left view of the principal part in the sewing machine for embroidery. It is a right view of the principal part in the sewing machine for embroidery. It is a front view of the principal part in the sewing machine for embroidery. It is a top view of the principal part in the sewing machine for embroidery. It is a right view explaining the threading operation of the embroidery sewing machine. It is a right view explaining the threading operation of the embroidery sewing machine. It is a longitudinal cross-sectional view around the eye hole of the sewing needle in the thread hooking state. FIG. 6 is a plan view of the vicinity of the eye of the sewing needle in the thread hooking state. It is a top view of the periphery of the eye of the sewing needle in a state where a thread loop is formed. It is a block diagram of schematic structure of a control unit. It is a flowchart of a threading control program.

Explanation of symbols

M Multi-head sewing machine M1 to M3 Embroidery sewing machine 10 Needle bar 14a Thread holding tape 14b Reinforcement plate 15 Sewing needle 15a Eye hole 16 Second thread holding member 32 Threading mechanism 33 Threading mechanism 62 Threading member 83 Threading hook 92 Threading Switch 100 Control unit 101 Computer 103 ROM
L thread loop F free end T thread

Claims (1)

In a sewing machine comprising: threading means for threading a threaded needle threaded by a threading hook; and threading means including a threading member for threading a thread extending downward through the threaded hole of the sewing needle;
The sewing machine is characterized in that the thread pulling means is configured to be able to eliminate a thread loop by pulling a loop-shaped thread threaded through the thread hole of the sewing needle by the threading hook with the thread pulling member.

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