JP5953062B2 - Sewing machine - Google Patents

Description

  The present invention relates to a threading device for a sewing machine for urging a needle thread to be fed toward a sewing needle.

Conventionally, as this kind of threading device for a sewing machine, for example, as shown in FIG. 11, a movable thread guide 1 and a first threading hole 3 and a second threading hole 3 provided on the front side of the sewing machine arm portion 2 and into which needle threads can be inserted. There is a thread take-up hole 4, and a swinging balance 6 that swings back and forth in synchronism with the vertical movement of the needle bar 5 around one end and is fixed to the upper end of the needle bar 5. In a thread reel device 9 of a sewing machine 8 having a thread reel hole 7a through which a thread can be inserted and a needle bar balance 7 for controlling the amount of needle thread fed, the first thread reel hole 3 of the swing balance 6 from the movable thread guide 1 is provided. Further, a path R1 that reaches the needle 10 through the needle bar balance 7 and a path R2 that is shorter than the path R1 and reaches the needle 10 through the second thread reel 4 of the swinging balance 6 from the movable thread guide 1 can be selected. (For example, refer patent document 1).
According to this, since the thread paths R1 and R2 of different lengths can be selected for the needle thread path from the thread tensioner 11 to the needle 10, for example, when it is desired to form a hard seam without loosening, In cases such as when it is desired to ensure the elongation of the needle thread, a longer path R1 may be selected, or in order to form a soft seam that is slightly loose, a shorter path R2 may be selected. It is.

JP 2003-979 A

However, in the thread reeling device 9 of the sewing machine as described above, when switching between the hard stitch and the soft stitch, the needle thread is fed into the first thread reel 3 or the second thread reel 4 provided integrally with the swing balance 6. There was a problem that it was very troublesome because it was necessary to re-select selectively.
In addition, in the case of soft seams, the needle thread is not tight and the sewing product is not soft to the touch. However, when the thread sliding resistance is increased in the thread tensioner 11 in order to tighten the needle thread, there is also a problem that the needle thread breaks easily.

  The present invention has been made to solve such problems, and the object of the present invention is to save labor in complicated work of passing the needle thread through when switching between a hard seam and a soft seam. It is an object of the present invention to provide a threading device for a sewing machine that can be used. Another object of the present invention is to provide a thread take-up device for a sewing machine that provides good needle thread tightening without breakage of the needle thread in the case of soft stitches.

The yarn threading device for a sewing machine according to the present invention includes a first thread guide portion through which a needle thread from a thread tension device is passed, a second thread guide portion through which a needle thread from the first yarn guide portion is passed, A movable yarn guide member through which the needle yarn from the two yarn guide portion is passed, and a thread reel hole through which the needle yarn from the movable yarn guide member is passed are provided on the swinging tip side, and the swinging proximal end side is supported. and the installed swing balance to swing vertically around the pivot shaft, the thread take-up device of a sewing machine provided on the front side of the sewing machine arm portion, the movable yarn guide member, configured separately from said rocking balance The needle thread passing through the second thread guide part is installed so that the vertical / left / right position can be adjusted between the yarn reeling hole and the second thread guide part. The movable yarn guide member and the movable yarn guide member so as to be bent in a mountain shape protruding upward between the movable yarn guide member and the first yarn guide portion. Serial and has a feature that is disposed between the first yarn guide.
According to this, when switching between a hard seam and a soft seam, the vertical and horizontal positions of the movable thread guide member are adjusted between the thread reel hole and the second thread guide part to thereby make a hard seam and a soft seam. Since switching is possible, the work can be easily performed compared to the troublesome work of passing the conventional needle thread.

Furthermore , in the case of soft stitches, the needle thread can be tightened satisfactorily without causing needle thread breakage as in the case of increasing the thread sliding resistance in the thread tension device.

Further, in the thread reeling device for a sewing machine according to the present invention, the adjusting means for adjusting the vertical position of the movable yarn guide member fixes a cover bracket to the front side of the sewing machine arm portion, and provides a long guide hole in the cover bracket in the vertical direction. On the other hand, the mounting bracket to which the movable thread guide member is attached is fixed by screws passed through the guide holes, and the screws are slid along the guide holes to move the movable thread guide members up and down. A configuration in which the position can be adjusted can be employed. According to this, the vertical position of the movable yarn guide member can be adjusted stably and reliably.
Further, in the yarn reeling device for a sewing machine according to the present invention, the adjustment means for the left and right position of the movable yarn guide member fixes the movable yarn guide member with a screw that is passed through a guide hole that is long in the left and right direction in the mounting bracket. Thus, it is possible to adopt a configuration in which the position of the movable yarn guide member in the left-right direction can be adjusted by sliding the screw along the guide hole. According to this, the left-right position of the movable yarn guide member can be adjusted stably and reliably.

  According to the present invention, it is possible to switch between a hard seam and a soft seam by a simple means of adjusting the vertical and horizontal positions of the movable thread guide member between the thread take-up hole of the swing balance and the second thread guide. This makes it possible to save labor in troublesome work of passing the needle thread.

It is a perspective view of a double chain stitch sewing machine to which the yarn reel device of the present invention is applied. It is a front view of the double chain stitch sewing machine. It is a top view of the double chain stitch sewing machine. It is an expansion perspective view of the yarn reeling device in the double chain stitch sewing machine. It is an enlarged front view of the yarn reeling device in the double chain stitch sewing machine. It is an enlarged plan view of the yarn reeling device in the same double chain stitch sewing machine. FIG. 3 is an enlarged perspective view showing the yarn reeling device in the double chain stitch sewing machine with the cover bracket removed. FIG. 3 is an enlarged front view showing the yarn reeling device in the double chain stitch sewing machine with the cover bracket removed. FIG. 6 is an enlarged plan view showing the yarn reeling device in the double chain stitch sewing machine with the cover bracket removed. It is a schematic front view of the yarn reeling device in the double chain stitch sewing machine. It is a schematic front view of the yarn reeling device in the double chain stitch sewing machine of the conventional example.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a sewing machine yarn reel according to the present invention will be described below with reference to the drawings.

  1 to 3 show a sewing machine 21 that is a double chain stitch sewing machine provided with a yarn reel device 20 as an embodiment of the present invention. 1 to 3, the sewing machine 21 has a bed portion 21a, a vertical trunk portion 21b standing from the bed portion 21a, and a sewing machine arm portion 21c extending from the vertical trunk portion 21b so as to be parallel to the bed portion 21a. Do it.

The sewing machine 21 has three needles 23 fixed to the lower end of a needle bar 22 that is reciprocated up and down by a sewing machine main shaft (not shown), and three needles that apply predetermined tension to the needle threads passed through the needles 23. A thread tensioner 24, a thread tensioner 26 that applies a predetermined tension to the upper decoration thread that is passed through the upper decoration spreader 25, and a thread tensioner 27 that applies a predetermined tension to the looper thread that is passed through a looper (not shown). Is provided. The upper spreader 25 is constructed so that both the cloth surface and the looper are linked to the main spindle of the sewing machine in the bed portion 21a. The sewing machine 21 is a combination of three needles 23 and a looper (not shown). A double ring decorative stitch is formed by entwining an upper decorative thread in a seam formed by the action.

  The yarn reeling device 20 includes an oil supply device 28, a thread tensioner 24, 26, which are disposed on the left side of the thread tensioner 24, 26, 27 installed on the front side of the vertical body part 21b and on the front side of the sewing machine arm part 21c. 27, a first yarn guide portion 29 disposed between the oil supply device 28, a second yarn guide portion 30 disposed on the left side of the oil supply device 28, and a swinging balance disposed on the left side of the second yarn guide portion 30. 31 and a movable thread guide member 32 that is configured separately from the swinging balance 31 and disposed on the front side of the swinging balance 31, and has three needle threads T (only one is shown in FIG. 1) during sewing. The thread take-up that pulls the thread and the thread feeding by loosening are repeated. The first thread guide portion 29 has three thread holes 33 through which the three needle threads T from the three thread tensioners 24 are passed. The oil supply device 28 is composed of an oil supply box 28a filled with felt impregnated with silicon oil as a lubricant, and the needle thread T is passed therethrough so that the silicon oil is applied to the needle thread T. It has become.

  As shown in FIGS. 7 and 8, the swing balance 31 is fixed to the swing base 31b and the swing base 31b which can swing up and down around a swing shaft 31a connected to the main spindle of the sewing machine. It consists of a swing arm 31c that is long on the left and right, and controls the thread feed amount by swinging between a predetermined top dead center and bottom dead center in synchronization with the needle bar 22. Three thread reels 34 are formed at the left end (tip) of the swing arm 31c.

  As shown in FIGS. 7 and 8, third and fourth thread guide portions 35 and 36 are arranged on the front side of the sewing machine arm portion 21c corresponding to the left side of the left end portion (tip portion) of the swing arm 31c. A yarn receiver 37 is installed between the third yarn guide portion 35 and the yarn reeling hole 34.

  As shown in FIGS. 7 to 9, the movable thread guide member 32 includes a support body 32 a and three thread guide bars 32 b that are screwed so as to penetrate the support body 32 a and have a thread hole 38 formed at the upper end. It consists of. Each thread guide bar 32b slides in the vertical direction with respect to the support 32a and can be fixed at a desired position, thereby adjusting the thread take-up and the yarn take-up amount.

Further, the movable yarn guide member 32 is installed between the yarn reel hole 34 of the swing balance 31 and the second yarn guide portion 30 so as to be able to adjust the vertical and horizontal positions. This also makes it possible to adjust the thread take-up and the thread take-up amount.
As specific adjustment means for the left and right and vertical positions of the movable yarn guide member 32, as shown in FIGS. 4 to 6, a cover having a guide hole 39 that is long in the vertical direction on the front side of the sewing machine arm portion 21c. The bracket 40 is attached with a screw 41. A mounting bracket 43 having a guide hole 42 that is long in the left-right direction is fixed to the cover bracket 40 with a screw 44 that passes through the guide hole 39 of the cover bracket 40, and the screw 44 is extended along the guide hole 39. The position of the mounting bracket 43 in the vertical direction can be adjusted stably and reliably. The movable thread guide member 32 is fixed to the mounting bracket 43 with a screw 45 passed through the guide hole 42, and the position of the movable thread guide member 32 in the left-right direction is determined by sliding the screw 45 along the guide hole 42. It is designed so that it can be adjusted stably and reliably. The vertical position of the movable thread guide member 32 can be adjusted by sliding the screw 44 along the guide hole 39 and adjusting the vertical position of the mounting bracket 43.

  When the second thread guide portion 30 forms a soft seam, the thread thread breakage does not occur as in the case where the thread tension resistance 24 increases the thread sliding resistance when the needle thread T is tightened. In order to allow T to be tightened satisfactorily, the needle thread T passed through the second thread guide section 30 is moved between the movable thread guide member 32 and the first thread guide section 29 as shown in FIG. It arrange | positions so that it may be bent in the mountain shape of upward protrusion. It is optional to fix the second yarn guide portion 30 at a predetermined position, and to install the second yarn guide portion 30 so that the vertical position can be adjusted or the horizontal position can be adjusted.

  The needle thread T that has passed through the thread tensioner 24 passes through the first thread guide 29 and the oil supply device 28, and then passes through the second thread guide 30. Next, the thread is passed through the thread guide rod 32 b of the movable thread guide member 32, and further through the thread reel hole 34 of the swing balance 31. After that, the thread receiver 37, the third thread guide part 35, and the fourth thread guide part 36 are passed through in this order toward the needle 23. As shown in FIG. 4, a finger guard 46 is attached to the cover bracket 40 to guard the needle thread T that is passed from the thread take-up hole 34 of the swing balance 31 to the thread receiver 37.

The path length of the needle thread path from the movable thread guide member 32 through the swinging balance 31 to the third thread guide member 35 is L, the path length at the top dead center of the needle bar is L1, and When the path length is L2, the path length difference between the needle bar top dead center and the bottom dead center is ΔL = L1−L2, and the vertical stroke amount of the needle bar 22 is H, 0 <ΔL <H. In addition, the left / right / up / down positions of the movable yarn guide member 32 can be adjusted.
In FIG. 10, a needle thread T indicated by a solid line a indicates a needle thread path at the top dead center of the needle bar, and a needle thread T indicated by a broken line b indicates a needle thread path at the bottom dead center of the needle bar.

  In the yarn reeling device 20 having the above configuration, when it is desired to form a hard seam that is relatively free of slack or to prevent thread breakage or the like, the movable yarn guide member 32 is moved and adjusted leftward and downward, The path length difference ΔL between the needle bar top dead center and the bottom dead center may be made relatively large.

  On the other hand, when it is desired to form a soft seam that is loosened to some extent, the path length difference ΔL between the needle bar upper dead point and the lower dead point is adjusted by moving the movable thread guide member 32 to the right and upward. Should be relatively small.

  According to the yarn reeling device 20 in the sewing machine 21 described above, the movable yarn guide member 32 is configured separately from the swing balance 31, and then the yarn reel hole 34 of the swing balance 31, the second yarn guide portion 30, and the like. The vertical and horizontal positions can be adjusted between the two. Therefore, when it is desired to form a hard seam without loosening or when it is desired to ensure the elongation of the thread, the movable thread guide member 32 is moved and adjusted to the left and downward to form a soft seam with a little slack. If desired, the hard stitches and the soft stitches can be easily switched by a simple operation of moving and adjusting the movable thread guide member 32 rightward and upward.

T needle thread 20 thread take-up device 21 sewing machine 21c sewing machine arm parts 24, 26, 27 thread tensioner 29 first thread guide part 30 second thread guide part 31 swing balance 31a swing shaft 32 movable thread guide member 34 thread take-up hole 39, 42 Guide hole 40 Cover bracket 41, 44, 45 Screw 43 Mounting bracket

Claims (3)

A first thread guide section through which a needle thread from a thread tensioner is passed, a second thread guide section through which a needle thread from the first thread guide section is passed, and a needle thread from the second thread guide section A movable thread guide member that is passed through and a yarn reel hole through which the needle thread from the movable thread guide member is passed are provided on the swing tip side, and swings up and down around a swing shaft that supports the swing base end side. In the yarn reeling device of the sewing machine provided with the swinging balance installed in the front side of the sewing machine arm part,
The movable yarn guide member, said the swing balance is constructed separately and is disposed capable of vertical and horizontal alignment between the thread take-up hole and the second thread guide portion,
The second thread guide portion is movable so as to bend the needle thread passed through the second thread guide portion into an upward projecting mountain shape between the movable yarn guide member and the first thread guide portion. A yarn reeling device for a sewing machine, which is disposed between a yarn guide member and the first yarn guide portion . The adjustment means for adjusting the vertical position of the movable yarn guide member is a mounting in which a cover bracket is fixed to the front side of the sewing machine arm portion, and a guide hole is provided in the cover bracket extending in the vertical direction while the movable yarn guide member is attached. The bracket is fixed by a screw passed through the guide hole, and the vertical position of the movable thread guide member can be adjusted by sliding the screw along the guide hole. thread take-up device 1 Symbol placement of the sewing machine. The adjusting means for adjusting the left and right position of the movable thread guide member is configured to fix the movable thread guide member with a screw that is passed through a guide hole that is provided in the mounting bracket so as to extend in the left and right direction. The thread reeling device for a sewing machine according to claim 2 , wherein the position of the movable yarn guide member in the left-right direction can be adjusted by sliding along the hole.

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