JP4273403B2 - Thread holding mechanism for threading and sewing machine having the same - Google Patents

Description

  The present invention relates to a thread holding mechanism for threading and a sewing machine including the same, and more particularly to a small thread holding mechanism for threading capable of sandwiching a middle part of an upper thread and a sewing machine including the thread holding mechanism.

Conventionally, various threading mechanisms and thread holding mechanisms for threading have been proposed in order to reduce the work of threading the sewing needle of the sewing machine. For example, Patent Literature 1 describes the following threading mechanism and thread holding mechanism for threading. First, in this thread holding mechanism, when the upper thread extending from the thread spool is guided to the thread guide groove, the upper thread is locked to the thread locking section and the thread gripping section (to the thread holding thread holding mechanism). Furthermore, the tip of the upper thread is cut by the thread cutting part and held by the thread holding part. When threading, the upper thread is moved to the vicinity of the needle hole of the sewing needle by the thread locking part rotated about the vertical axis, and the upper thread is inserted into the hook inserted through the needle hole from the opposite side of the thread locking part. Are engaged, and the upper thread is passed through the needle hole when the hook passes through the needle hole. Further, the thread gripping part is rotated in the reverse direction around the same vertical axis in conjunction with the rotation of the thread locking part in order to maintain the tension of the upper thread.
JP-A-8-173676

  However, since the yarn gripping portion of Patent Document 1 is provided at the tip of the support member extending from the vertical axis, there arises a problem that a space necessary for the configuration for the yarn gripping portion and the yarn gripping portion is increased. In addition, this thread gripping mechanism needs to be rotated around the vertical axis together with the support member in order to maintain the tension of the upper thread, and a large rotation space for rotating the thread gripping part and the support member is required. Become. In particular, in a multi-needle type sewing machine, since a plurality of needle bars are adjacent to each other, it is impossible to apply the thread gripping portion described in Patent Document 1.

  An object of the present invention is to provide a thread holding mechanism for threading a small sewing machine for holding an upper thread to be threaded and a sewing machine having the thread holding mechanism.

The thread holding mechanism for threading a sewing machine according to claim 1 includes a presser foot member having a presser foot part and a leg part extending upward from the presser foot part, and a threading hook that moves forward and backward in the needle hole of the sewing needle. A sewing machine comprising a threading mechanism for threading an upper thread guided in the vicinity of a needle hole through the needle hole, and a thread end holding mechanism for retaining a thread end of the upper thread guided in the vicinity of the needle hole. In the thread holding mechanism for threading, an elastic thread holding plate fixed to the leg portion and capable of sandwiching the upper thread in cooperation with the cloth presser member is provided.

  According to this thread holding mechanism of the sewing machine, in order to advance and retract the threading hook of the threading mechanism into the needle hole of the sewing needle and thread the upper thread through the needle hole, the thread is hooked on the threading hook and in the vicinity of the needle hole. The upper thread guided near the needle hole to be guided or hooked to the threading hook, and the middle part of the upper thread with the thread end held by the thread end holding mechanism is fixed to the leg of the presser foot member The elastic yarn holding plate and the cloth presser member are clamped by cooperation.

A thread holding mechanism for threading a sewing machine according to claim 2 is the invention according to claim 1, wherein the elastic thread holding plate includes an extending plate portion disposed along the leg portion, and the extending plate portion. And the leg portion so that the upper thread can be clamped. According to this thread holding mechanism of the sewing machine, the middle part of the upper thread guided in the vicinity of the needle hole for threading is cooperated with the extending plate part arranged along the leg part and the leg part. It is pinched by.

The thread holding mechanism for threading a sewing machine according to a third aspect is the invention according to the first or second aspect, wherein the elastic thread holding plate has an engaging portion for engaging the upper thread at a predetermined height from the lower end. It is formed. According to the thread holding mechanism for threading the sewing machine, the upper thread clamped by the elastic thread holding plate and the presser member is moved to the engaging portion formed at a predetermined height from the lower end of the elastic thread holding plate. Engaged.

A thread holding mechanism for threading a sewing machine according to a fourth aspect is the invention according to any one of the first to third aspects, wherein the elastic thread holding plate includes an extending portion that extends forward from the leg portion at a lower end thereof. It is a thing. According to the thread holding mechanism for threading the sewing machine, the upper thread is hung on the extended portion formed to extend forward from the leg portion at the lower end of the elastic yarn holding plate, and the elastic yarn holding plate and the leg It is pinched by the part.

A thread holding mechanism for threading a sewing machine according to a fifth aspect of the present invention is the thread holding mechanism for threading a sewing machine according to the fourth aspect of the invention, wherein the elastic thread holding plate is rearward from the lower end of the extension portion and guides the upper thread to the threading hook. A guide portion inclined upward is provided. According to the thread holding mechanism for threading the sewing machine, the upper thread hung on the extending part is guided by the guide part inclined backward and upward from the lower end of the extending part of the elastic thread holding plate, and the threading hook. Hung on.

A sewing machine according to a sixth aspect is provided with the thread holding mechanism for threading the sewing machine according to any one of the first to fifth aspects .

According to this sewing machine, it is possible to obtain the same operation as any one of claims 1 to 5.

  According to the invention of claim 1, since the middle part of the upper thread is clamped by the cooperation of the presser foot member and the elastic thread holding member fixed to the presser foot member, the thread holding thread holding mechanism can be reduced in size and It can be simplified. In addition, the upper thread is clamped by the cloth presser member provided near the sewing needle and the elastic thread holding plate, so that the upper thread is not released even if the upper thread is pulled by the threading hook. Therefore, since the upper thread does not loosen and come off the threading hook, the upper thread once hung on the threading hook can be reliably threaded.

  According to the second aspect of the present invention, the thread holding mechanism for threading can be further reduced in size and simplified by arranging the leg portion and the extending plate portion along the leg portion.

  According to the invention of claim 3, since the upper thread clamped between the cloth presser member and the elastic thread holding plate is engaged with the engaging portion, the upper thread is prevented from moving indefinitely upward, The upper thread can be clamped at the position.

  According to the fourth aspect of the present invention, the upper thread is hooked on the extending portion and the upper thread is clamped, so that the upper thread can be easily clamped.

  According to the invention of claim 5, since the upper thread hung on the extending part is guided by the guide part and hung on the threading hook, the threading operation on the threading hook can be simplified.

According to invention of Claim 6, there can exist an effect similar to any one of Claims 1-5.

  The purpose of the present invention to provide a thread holding mechanism of a small sewing machine for holding the upper thread to be threaded is fixed to the leg portion of the presser foot member, and the upper thread can be clamped in cooperation with the presser foot member. This is achieved by providing a flexible elastic yarn holding plate.

  Examples of the present invention will be described. The present embodiment is an example in which the present invention is applied to a multi-needle type sewing machine having six sewing needles. In addition, let the direction where the operator shown by the arrow in FIG.

As shown in FIGS. 1 and 2, a pair of left and right support portions 1 that support the multi-needle type sewing machine M, a pedestal portion 2 that stands on the rear portion of the support portion 1, and an upper end of the pedestal portion 2 An arm part 3 extending forward from the arm part, a needle bar case 4 having six sewing needles 10 movably provided at the distal end of the arm part 3, and an operation panel provided in the middle of the arm part 3 5, a cylinder bed portion 6 that extends forward from the pedestal column portion 2, an embroidery frame holding mechanism 7, and the like.
As shown in FIGS. 3 and 4, the arm portion 3 includes a threading mechanism 12 for passing the upper thread T through the needle hole 11 of the sewing needle 10, a thread pulling mechanism 13 for threading the upper thread T, and the like. Is provided.

  The threading mechanism 12 is for threading the upper thread T guided near the needle hole 11 through the needle hole 11 by moving the threading hook 20 back and forth in the needle hole 11 of the sewing needle 10. As shown in FIGS. 3 and 5, the threading mechanism 12 includes a threading motor 15 formed of a pulse motor, a guide rack 16, a guide frame 17, first and second link members 18 and 19, and left and right 1. A threading hook 20 guarded by a pair of hook guards 20a is provided.

  When the upper thread T is threaded, the threading motor 15 is rotationally driven in the direction of arrow A in FIG. 3 from the state where the threading hook 20 is positioned at the standby position indicated by the solid line in FIG. The driving force is transmitted to the guide rack 16 via the rack portion 21 at the front end portion of the guide rack 16 engaged with the output gear 15 a of the guide gear 16. The guide rack 16 is fixed to the frame 22 of the arm portion 3 and is guided to the guide groove 23. It is moved downward while being guided by a pair of upper and lower guide pins 24 engaged with each other. When the guide rack 16 is moved downward, the first link member 18 rotatably connected to the lower end portion of the guide rack 16 and disposed on the right side of the guide frame 17 is the first link member 18 provided at the distal end portion thereof. 1 The guided pin 25 is moved while being guided by the guide groove 26 of the guide frame 17.

  Due to the movement of the first link member 18, the second link member 19 disposed on the left side of the guide frame 17 and connected to the first link member 18 by the first guided pin 25 is inserted into the guide groove 26 and the second link member 19. The first and second guided pins 25, 28 fixed to the two link member 19 are moved while being guided by the guide groove 26, and as shown in FIG. 3, the yarn fixed to the front end portion of the second link member 19 The threading hook 20 is inserted into the needle hole 11 of the sewing needle 10. As shown in FIGS. 8 and 9, when the upper thread T is hooked on the threading hook 20, the threading motor 15 is driven in the opposite direction to the above, and the threading hook 20 is pulled out from the needle hole 11, and the upper thread T In a state where T is passed through the needle hole 11 and the threading hook 20 is stopped at the threading position indicated by a chain line in FIG. 6, the upper thread T is pulled and threaded by the threading mechanism 13 described later. A rattle-preventing spring 29 whose upper end is fixed to the frame 22 is connected to the lower end of the guide rack 16.

  As shown in FIGS. 3 to 5, the yarn drawing mechanism 13 includes a drive motor 31 formed of a pulse motor, a sector gear 32, a yarn drawing member 33, a link member 34, a guide member 35, and the like. In the case of threading in threading, the drive motor 31 is driven to rotate in the direction of arrow B in FIG. 4 while the threading hook 20 is waiting at the threading position indicated by the chain line in FIG. The sector gear 32 engaged with the output shaft 31a of the motor 31 is rotated, and this driving force is transmitted to the thread drawing member 33 through the link member 34, and is located at the standby position indicated by the solid line in FIG. The member 33 is driven downward and forward while being guided by the guide member 35 to the position indicated by the chain line in FIG. 6, and the hook portion 33 a formed at the distal end portion of the thread drawing member 33 is connected to the threading hook 20 and the needle hole 11. The upper thread T is hung on the hook portion 33a of the thread pulling member 33. Thereafter, the drive motor 31 is rotated in the opposite direction to the above so that the thread pulling member 33 is driven in the reverse direction to the above, and the upper thread T is a magic tape (registered trademark) provided in the shape of the track of the thread pulling member 33. The yarn is transferred to and held by a yarn holding tape 37 made of the like.

On the other hand, the thread pulling mechanism 13 pulls the upper thread T even when the thread is changed. In this case, since the upper thread T hangs downward from the needle hole 11, the hook portion 33a is connected to the sewing needle 10. It is driven until it reaches a vertically lower position, and the thread is pulled.
The drive motor 31 also drives a needle bar release mechanism 39 that cuts off transmission of driving force from a sewing machine motor (not shown) to the needle bar 38, but the description thereof is omitted because it is not directly related to the present application.

  The needle bar case 4 includes a needle bar 38 with a sewing needle 10 attached to the lower end, a cloth presser member 41 for pressing a work cloth, a thread end holding mechanism 40, and a threading thread holding mechanism 42 (hereinafter referred to as a thread holding mechanism 42). A thread holding mechanism 42) and the like are provided. Note that six or six needle bars 38, a thread end holding mechanism 40, a cloth presser member 41, and a thread holding mechanism 42 are provided.

  The six needle bars 38 are moved in the left-right direction together with the needle bar case 4, and a desired needle bar 38 is selected. The needle bar 38 is moved together with the sewing needle 10 by the driving force transmitted from the sewing machine motor (not shown). The stitches are formed by the reciprocating drive up and down and by the cooperation of a thread catcher (not shown) provided in the cylinder bed 6 and the sewing needle 10.

  The thread end holding mechanism 40 is for cutting and holding the thread end of the upper thread T that is hung on the threading hook 20 and guided in the vicinity of the needle hole 11. As shown in FIG. 2, the thread end holding mechanism 40 has a plate-like member having an upper end fixed to a fixing plate 48 fixed to the frame 4 a of the needle bar case 4 and formed in a substantially L shape when viewed from the front. 50. The plate-like member 50 has a blade portion 49 for cutting the upper thread T at the bent position, and the upper thread T is placed between the plate-like member 50 and the fixed plate 48 at the right end of the plate-like member 50. A guide portion 51 bent forward is formed for guidance. When the yarn end holding mechanism 40 holds the yarn end of the upper yarn T, when the upper yarn T is moved from the right side to the left side of the guide portion 51 behind the guide portion 51, the upper yarn T becomes a plate-like member. When the upper thread T is moved to the blade part 49, the upper thread T is cut by the blade part 49 by moving the thread end of the upper thread T forward. (See Fig. 2).

  As shown in FIGS. 7 and 8, the upper end portion of the cloth presser member 41 is fixed to a sliding member 44 that is slidably supported by the needle bar 38 via a fixing member 43. The presser foot member 41 includes a presser foot portion 46 for pressing the work cloth, and a leg portion 47 extending upward from the left end portion of the presser foot portion 46.

  The thread holding mechanism 42 is for holding the upper thread T in cooperation with the cloth presser member 41. As shown in FIGS. 7 to 9, the thread holding mechanism 42 is a leaf spring-like elastic member whose upper end is attached by a pin 60 to the right side of the leg portion 47 of the presser foot member 41, that is, to the presser foot portion 46 side. A thread holding plate 55 is provided. The elastic yarn holding plate 55 includes an extending plate portion 56 disposed along the leg portion 47, and the elastic yarn holding plate 55 and the leg portion 47 are cooperated with the extending plate portion 56 and the leg portion 47. The upper thread T is pinched by a slight gap formed between the two.

  An extension portion 57 is formed at the lower end of the elastic yarn holding plate 55 so as to extend forward from the leg portion 47 and the upper thread T is hooked first. A guide portion 58 that is inclined backward and upward from the lower end of 57 and guides the upper thread T to the threading hook 20 is provided.

  An engaging portion 59 is formed in which the upper thread T is engaged with the rear portion of the elastic yarn holding plate 55 at a predetermined height from the lower end portion. The engaging portion 59 engages the upper thread T that is hooked on the threading hook 20 and pulled upward, and the upper thread T held between the leg portion 47 and the elastic thread holding plate 55 is engaged. This is to prevent movement upward from the portion 59.

  Next, threading of the upper thread T to the threading hook 20 inserted through the needle hole 11 of the sewing needle 10 will be described. First, an upper thread T extending from a thread spool (not shown) placed on the upper surface of the arm portion 3 is hung on a balance 61 or the like, and extends from below so that the thread end side of the upper thread T is on the left side. An upper thread T (upper thread T ′ shown in FIG. 9) is hung on the portion 57. Next, when the yarn end side of the upper thread T hung on the guide portion 58 is pulled upward, the upper yarn T is guided upward by the guide portion 58 and moved upward and rearward. As shown in FIGS. 8 and 9, it is sandwiched between the leg portion 47 and the extended plate portion 56 and is hooked on the threading hook 20 and engaged with the engaging portion 59. Thereafter, the yarn end of the upper yarn T is held by the yarn end holding mechanism 40 as described above.

  The upper thread T that is hooked on the threading hook 20 and held by the thread end holding mechanism 40 and the thread holding mechanism 42 is threaded in a state where the upper thread T is held by the thread holding mechanism 42 and is kept in tension. The threading hook 20 is driven rearward to pass through the needle hole 11, and thereafter, as shown in the chain line of FIG. 6 and FIG. 10, the middle part of the upper thread T is clamped by the thread holding mechanism 42, and the upper thread T is tensioned. The hook portion 33a of the thread pulling member 33 is inserted between the thread loop L formed between the threading hook 20 and the needle hole 11, and the upper thread T is hung on the hook portion 33a. The yarn is pulled by the yarn pulling member 33 and held by the yarn holding tape 37.

The operation and effect of the yarn holding mechanism 42 described above will be described.
The thread holding mechanism 42 has a configuration in which the elastic thread holding plate 55 is simply attached to the presser foot member 41, and the upper thread T hung on the threading hook 20 is converted into the elastic thread attached to the leg 47 and the leg 47. Since it is configured so that it can be clamped in cooperation with the extended plate portion 56 of the holding plate 55, the yarn holding mechanism 42 can be greatly reduced in size and simplified. In particular, in the multi-needle type sewing machine M in which the sewing needles 10 are provided close to each other as in the present embodiment, the thread holding mechanism 42 thus reduced in size is effective.

  Even if the upper thread T is pulled by the threading hook 20 and the upper end of the upper thread T is released from the thread end holding mechanism 40, the upper thread T is retained by the thread retaining mechanism 42. Since the tension of the upper thread T is not loosened, the upper thread T is not detached from the threading hook 20 and the upper thread T hung on the threading hook 20 is reliably threaded. Further, since the thread holding mechanism 42 is provided in the vicinity of the sewing needle 10, even if the upper thread T passed through the needle hole 11 is pulled to the pulling position by the threading hook 20, Since the yarn holding state is maintained and the yarn loop L is held by the threading hook 20 without drooping, the upper thread T can be reliably hung on the hook portion 33a of the yarn pulling member 33.

  Since the extended portion 57 and the guide portion 58 are formed at the lower end portion of the elastic thread holding plate 55, the upper thread T is guided between the leg portion 47 and the elastic thread holding plate 55, and the threading hook. It is possible to perform threading to 20 simultaneously and easily. Since the engaging portion 59 is formed at a position at a predetermined height from the lower end of the elastic yarn holding plate 55, even if the upper yarn T is pulled upward to be held by the yarn end holding mechanism 40, the upper yarn Since the middle part of T is engaged with the engaging part 59, it is possible to prevent the upper thread T from going too far upward.

Next, a modified example in which the above-described embodiment is partially modified will be described.
1) In the above-described embodiment, the thread holding mechanism 42 is applied to the multi-needle type sewing machine M. However, the thread holding mechanism 42 is not limited to the multi-needle type sewing machine. It is possible to apply.

2) In the above-described embodiment, the upper thread T is sandwiched between the leg 47 and the elastic thread holding plate 55. However, the upper thread may be sandwiched between the presser foot part and the elastic thread retaining plate.
3) In the above-described embodiment, the upper thread T is sandwiched between the cloth presser member 41 and the elastic thread holding plate 55 and the upper thread T is hung on the threading hook 20. The upper thread clamped by the thread may be hung on the threading hook by another mechanism.

  Note that the present invention is not limited to the above-described embodiment, and those skilled in the art can implement various modifications to the above-described embodiment without departing from the spirit of the present invention. In addition, the present invention includes such modified forms.

1 is an overall view of a multi-needle type sewing machine M according to an embodiment of the present invention. It is a front view of a needle bar case. It is an internal structure figure of a needle bar case and the right side of an arm part front end part. It is an internal structure figure of the left side of a needle bar case and an arm part front end part. FIG. 3 is a structural diagram of the threading mechanism and the thread drawing mechanism as viewed from the front. It is drive explanatory drawing of a threading hook and a thread drawing member. It is a right view of a cloth presser member and a thread holding mechanism. It is a front view of a cloth presser member and a thread holding mechanism. It is a figure explaining the threading state of the upper thread hung on the threading hook. It is a figure explaining the thread loop of the upper thread passed through the needle hole.

M Multi-needle sewing machine T Upper thread 10 Sewing needle 11 Needle hole 12 Threading mechanism 20 Threading hook 40 Thread end holding mechanism 41 Cloth holding member 42 Thread holding thread holding mechanism 46 Cloth holding foot 47 Leg part 55 Elastic thread holding plate 56 Extension plate part 57 Extension part 58 Guide part 59 Engagement part

Claims (6)

A presser foot having a presser foot and a leg extending upward from the presser foot, and an upper thread guided in the vicinity of the needle hole by advancing and retracting a threading hook through the needle hole of the sewing needle. A thread holding mechanism for threading a sewing machine, comprising: a threading mechanism for threading the needle thread; and a thread end holding mechanism for holding the thread end of the upper thread guided in the vicinity of the needle hole.
A thread holding mechanism for threading a sewing machine, comprising an elastic thread holding plate fixed to the leg portion and capable of clamping the upper thread in cooperation with the presser foot member.   The elastic yarn holding plate includes an extending plate portion disposed along the leg portion, and is configured to be able to sandwich the upper thread between the extending plate portion and the leg portion. The thread holding mechanism for threading a sewing machine according to claim 1.   The thread holding for threading a sewing machine according to claim 1 or 2, wherein the elastic thread holding plate is formed with an engaging portion for engaging the upper thread at a position at a predetermined height from the lower end. mechanism.   The thread holding mechanism for threading a sewing machine according to any one of claims 1 to 3, wherein the elastic yarn holding plate includes an extending portion extending forward from the leg portion at a lower end thereof.   5. The sewing machine according to claim 4, wherein the elastic yarn holding plate includes a guide portion that is inclined rearward and upward from a lower end of the extension portion in order to guide the upper yarn to the threading hook. Thread holding mechanism for threading. A sewing machine comprising the thread holding mechanism for threading a sewing machine according to any one of claims 1 to 5.