JP2000042279A - Paused needle thread holding device for multiple needle embroidery machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent trouble wherein the peripheral edge part of a fabric to be worked which is stood while being pinched by an embroidering frame makes a needle thread which is cleared up to the back side of a needle fall down from a needle thread holder, from occurring. SOLUTION: For this paused needle thread holding device for a multiple needle embroidery machine, equipped with a needle thread clearing member which clears up a needle thread 8 passing through a needle 5 from the under side of the needle 5 to the back side when the needle 5 pauses embroidering, and a needle thread holder 27 to hold the vicinity of a cut end of the needle thread 8 at a location where the cleared up needle thread 8 extends backward from the needle 5 by a specified length, a needle thread protecting member 35 to protect the needle thread 8 by locating directly under a backward extended part 8a of the needle thread 8 so that the peripheral edge part 11a of a fabric 11 to be worked which is stood while being pinched by an embroidering frame 12 may not be entangled with the backward extended part 8a of the needle thread 8 which extends backward from the needle 5, is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-needle embroidery sewing machine, in which, when each needle stops embroidery sewing, the upper thread passing through the needle is lifted to the rear of the needle and held. The present invention relates to a needle thread holding device.

[0002]

2. Description of the Related Art In a multi-needle embroidery sewing machine, as shown in FIGS. 4 and 5, one needle 52 selected from a plurality of needles 52 of an embroidery head 51 is arranged at a sewing position to perform embroidery sewing. Let them do it. Then, when the needle 52 stops the embroidery sewing, the upper thread 53 passing through the needle 52 is cut by a thread cutting device 67 provided near the shuttle 54, and the upper thread 53 is
Needle 52 is hooked by a needle threading device 55 provided behind
When the upper thread 53 extends rearward from the needle 52 by a predetermined length, the vicinity of the cut end of the upper thread 53 is held by the upper thread holder 56 provided behind the needle 52. Like that. This is because if the cut upper thread 53 hangs on the work cloth 57, it is sewn into the work cloth 57 by the next needle (not shown) arranged at the sewing position, so that the sewing is prevented. That's why.

[0005] As shown in FIGS. 5 and 6, the upper thread holder 56 includes a pair of upper and lower holding plates 58, a number of hairs 59 planted on opposing surfaces of the respective holding plates 58, Side holding plate 58
And mounting brackets 60 provided on both left and right ends of the
The screw 61 is attached to the embroidery head 51 in the mounting bracket 60.
Installed in. The pair of upper and lower holding plates 58 are fixed to each other with screws 63 in a state of facing a predetermined interval by a spacer 62 interposed therebetween.

[0004]

However, the work cloth 57
Is not so large with respect to the embroidery frame 64 and is a strong or thick fabric, and when the work cloth 57 is sandwiched by the embroidery frame 64, the peripheral edge 57a of the work cloth 57 rises. The upstanding peripheral portion 57a is fitted to the embroidery frame 6.
The upper thread 53 extending rearward from the needle 52 with the driving of the needle 4
The upper thread 53 may fall off from the upper thread holder 56 by hooking the trailing portion 53a, and the sewing has occurred.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent a problem that a peripheral edge of a work cloth that is sandwiched and raised by an embroidery frame causes a needle thread lifted behind a needle to drop off from a needle thread holder. It is an object of the present invention to provide a rest needle thread holding device of a multi-needle embroidery sewing machine which can perform the above operation.

[0006]

According to the present invention, there is provided a multi-needle embroidery sewing machine in which one needle selected from a plurality of needles is arranged at a sewing position and embroidery sewing is performed. An upper thread releasing member that lifts the upper thread passing through the needle from below the needle when the needle is stopped, and a device in which the lifted upper thread extends rearward from the needle by a predetermined length. A suspended upper thread holding device having an upper thread holding device for holding a vicinity of a cut end of the upper thread, wherein the upper thread in which a peripheral edge of an upright work cloth sandwiched by an embroidery frame extends rearward from the needle. In order to prevent the trailing portion from being hooked, an upper thread protecting member is provided immediately below the trailing portion to protect the upper thread.

[0007] The upper thread protection member may be provided independently of the upper thread holder, but is preferably protruded forward from the upper thread holder in order to reduce the number of parts. The one integrally formed with the thread holder is preferable.

Further, since the upper thread protection member is often located on the path of passage of the upper thread take-up member, it is preferable that the upper thread protection member is formed with a passage permitting portion which permits the passage of the upper thread take-up member. . Notch, hole, etc. can be exemplified as the passage permitting portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a multi-needle embroidery sewing machine embodying the present invention will be described below with reference to FIGS. An embroidery head 2 is supported on the arm 1 of the multi-needle embroidery sewing machine so as to be slidable in the left-right direction. A plurality of needle bars 4 are arranged in the embroidery head 2 so as to be vertically movable at equal intervals in the left-right direction, and a needle 5 and a cloth presser 6 are attached to each needle bar 4. Thread holding apron 7 on the front of embroidery head 2
The thread holding apron 7 is provided with the same number of thread grippers 9 as the number of the needles 5 and the like, which grips the upper thread 8 passed through each needle 5 when necessary.

Bed 1 provided below embroidery head 2
Above 0, the embroidery frame 12 on which the work cloth 11 is stretched is driven back and forth and right and left in a horizontal plane by a driving device (not shown). The bed 10 is provided with a needle plate 13, and a thread cutting device 14 and a shuttle 15 are arranged below the needle plate 13. The upper thread 8 is passed through the thread holding apron 7 from a bobbin via a thread tension plate, a balance (not shown), and the like, and is supplied to the shuttle 15 through the needle 5, the cloth presser 6, and the needle plate 13 therefrom. . Then, one needle 5 selected from the plurality of needles 5 is arranged at the sewing position as the embroidery head 2 slides left and right, and the needle 5 at the sewing position and the shuttle 15 cooperate with each other to attach the work cloth W to the work cloth W. Embroidery sewing is performed.

An arm 1 behind the needle bar 4 is provided with an upper thread 8 for lifting the upper thread 8 passing through the needle 5 from below the needle 5 when the needle 5 at the sewing position stops embroidery sewing. A thread levitating device 17 is attached by a fixture 16 in a posture inclined forward and downward. This inclination is to enlarge the space behind the needle 5.

The upper thread splitting device 17 includes a guide member 18 fixed to the arm 1, an elongated plate-shaped upper thread splitting member 19 slidably inserted into a guide groove of the guide member 18,
A rotary solenoid 20 attached to the upper end of the guide member 18, and a link mechanism 21 for converting the rotational movement of the rotary solenoid 20 into a linear movement of the needle thread take-up member 19.
A hook-shaped hooking portion 22 is formed at the front end of the upper thread take-up member 19.

At the rear of the embroidery head 2, the upper thread 8, which has been lifted rearward of the needle 5 by the upper thread leap member 19, extends rearward from the needle 5 by a predetermined length, and the cut end of the upper thread 8. An upper thread holder 27 for holding the vicinity of the section is provided.

The upper thread holder 27 includes a pair of upper and lower holding plates 28.
A plurality of hairs 29 planted on opposing surfaces of each holding plate 28, and a mounting bracket 30 that is bent from both left and right ends of the lower holding plate 28 and extends upward. Is attached to the embroidery head 2 with screws 31. The pair of upper and lower holding plates 28 are fixed to each other by screws 33 in a state where they face each other at a predetermined interval by a spacer 32 interposed therebetween. The upper thread splitting member 19 can pass between the hairs 29, and the vicinity of the cut end of the upper thread 8 is the hair 2
9 is maintained.

As described above, when the work cloth 11 is not so large with respect to the embroidery frame 12 and is a strong or thick cloth, the work cloth 11 is The peripheral edge 11a of the cloth 11 stands upright. Therefore, in the present embodiment, the upright peripheral portion 11a is
The upper thread 8 is located immediately below the rear thread 8a so as not to catch the rear thread 8a of the upper thread 8 extending rearward from the upper thread 8.
Is provided with an upper thread protection member 35 for protecting the upper thread.

The upper thread protection member 35 is located at the rear between each of the plurality of needles 5 and the protection plate 36 extending continuously downward from the front edge of the lower holding plate 28 of the upper thread holder 27. A plurality of protection projections 37 projecting forward from the front edge of the protection plate 36 so that the rear extension 8a is positioned below even if it is slightly bent. Between each of the plurality of protection projections 37, there is a passage permitting portion 38 (a cutout in this example) that allows the upper thread take-up member 19 to pass through.

The upper thread take-up device 17 and the upper thread holder 27
And the upper thread protection member 35 operates as follows.

When the needle 5 stops the embroidery sewing and reaches the needle stop position, the thread gripping device 9 grips the upper thread 8. The rotary solenoid 20 is excited, and the upper thread take-up member 19 slides forward along the guide member 18 via the link mechanism 21. The needle thread take-up member 19 penetrates the needle thread holder 56, further passes through the passage permitting portion 38, and advances to below the needle 5. The rotary solenoid 20 is demagnetized, and the upper thread take-up member 1 is urged by a biasing force of a spring (not shown) incorporated therein.
9 retreats. In the initial stage of the retreat, the upper thread take-up member 19
Is hooked on the upper thread 8 between the needle 5 and the needle plate 13, the upper thread 8 is tensioned, and the retraction stops once. When the thread cutting device 14 cuts the upper thread 8 below the needle plate 13, the tension of the upper thread 8 is released, so that the upper thread splitting member 19 is further retracted by the urging force of the spring. Due to this retreat, the upper thread 8 extends rearward from the needle 5 by a predetermined length (rear extending portion 8a), and the vicinity of the cut end is disengaged from the hook portion 22 and held by the upper thread holder 56. Then, even if the rising edge portion 57a of the work cloth 57 approaches the trailing portion 8a of the upper thread 8 with the driving of the embroidery frame 12, it only hits the lower surface of the upper thread protection member 35, and moves upward. There is no touch on a certain back extension 8a. Therefore, it is possible to prevent the upper thread 8 from falling off from the upper thread holder 56, and there is no possibility that the upper thread 8 is sewn into the work cloth 11 by the needle 5 which starts embroidery sewing next.

It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented with, for example, the following modifications. (1) Changing the shape of the protection projection 37 and the passage permitting portion 38. (2) The upper thread protection member 35 is composed of only the protection protrusion 37. (3) Instead of the rotary solenoid 20 and the link mechanism 21, a linear actuator (a linear motor, a fluid pressure cylinder, etc.) as disclosed in JP-A-8-243285 is employed, and To produce linear motion. In this case, it is possible to reduce the size, simplification, cost, operation failure, and weight of the upper thread take-up device.

[0020]

As described above in detail, according to the resting needle thread holding device of the multi-needle embroidery sewing machine according to the present invention, the peripheral edge of the work cloth which is sandwiched by the embroidery frame and rises is lifted to the rear of the needle. It is possible to prevent a problem that the upper thread that has been dropped comes off from the upper thread holder.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a multi-needle embroidery sewing machine according to an embodiment of the present invention and a rest needle thread holding device thereof.

FIG. 2 is a sectional view of the multi-needle embroidery sewing machine and its idle needle thread holding device.

FIG. 3 is an exploded perspective view of the upper thread holder of the rest upper thread holding device.

FIG. 4 is a perspective view showing a conventional multi-needle embroidery sewing machine and its idle upper thread holding device.

FIG. 5 is a cross-sectional view of the multi-needle embroidery sewing machine and its idle upper thread holding device.

FIG. 6 is an exploded perspective view of a needle thread holder of the idle needle thread holding device.

[Explanation of symbols]

 2 Embroidery head 5 Needle 8 Upper thread 8a Backward extending part 11 Work cloth 11a Peripheral edge 12 Embroidery frame 14 Thread cutting device 17 Upper thread release device 19 Upper thread release member 27 Upper thread holder 28 Holding plate 29 Hair 30 Mounting bracket 35 Upper thread protection member 36 Protective plate 37 Protective protruding piece 38 Passage permissible portion

Claims (3)

[Claims] 1. A multi-needle embroidery sewing machine for performing embroidery sewing by arranging one needle selected from a plurality of needles at a sewing position. An upper thread retraction member that lifts a passing upper thread backward from below the needle, and a portion near the cut end of the upper thread where the lifted upper thread extends rearward from the needle by a predetermined length. A resting needle thread holding device provided with a needle thread holding tool for holding, so that a peripheral portion of the upright work cloth sandwiched by an embroidery frame does not catch a trailing portion of the needle thread extending rearward from the needle. An upper thread holding device for a multi-needle embroidery sewing machine, wherein an upper thread protecting member is provided immediately below the trailing portion to protect the upper thread. 2. A rest needle thread holding device for a multi-needle embroidery sewing machine according to claim 1, wherein said needle thread protection member protrudes forward from said needle thread holder. 3. A rest needle thread holding device for a multi-needle embroidery sewing machine according to claim 1, wherein said needle thread protection member is formed with a passage permitting part which permits passage of said needle thread take-up member.