JPS6324873Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for securely holding a cut thread end in a state where it is passed through a needle hole in an embroidery or other sewing machine.

In conventional embroidery sewing machines, a single head is equipped with a plurality of needles, and threads of different colors are passed through the needle holes with their ends slightly protruding from the needle holes, and are held in standby as stop threads. Embroidery is effectively performed using desired colored threads. However, when the end of the thread of the required length is let out from the needle hole and the thread is stopped,
Although the next embroidery can be started immediately, the end of the thread often comes out of the needle hole during the next sewing process. To prevent this, the end of the thread that protrudes from the needle hole is made longer and wrapped around other objects. Therefore, the thread end length is longer than necessary, which makes the thread uneconomical, and requires the labor of cutting off the extra thread end with scissors or the like after embroidery.

In view of these drawbacks, the present invention has been developed to allow the thread end of a predetermined length to protrude from the needle hole, and to wait so that the thread end can be securely held and the next embroidery can be carried out reliably. It is something to do.

The present invention will be explained below based on the drawings.

In the figure, reference numeral 1 denotes a head body of a sewing machine, and a plurality of needle bars 3 are arranged and provided directly at the bottom of the head body 1 or on a needle bar mounting plate 2 provided at the bottom of the head body. The large number of needle bars 3 may be arranged in a straight line as shown in the figure, or in a disc shape, depending on the shape of the sewing machine head. Second
The figure shows a plurality of needles arranged linearly at predetermined pitches along the needle bar mounting plate, and FIG. 4 shows a plurality of needles arranged in an arc shape. A needle 4 is attached to the lower end of each needle bar 3 in a replaceable manner, and a pair of presser feet 5 are also provided, and any one of the needle bars can be selectively moved up and down. There is.
As with conventional sewing machines, if the disk-shaped needle bar mounting plate is used, it can be rotated to the right or left relative to the main body 1, and if the head main body is straight, the head main body can slide laterally to the desired position. A needle bar is selected and the needle bar is raised and lowered to perform embroidery using the working thread.

Further, a bracket 6 is vertically provided at the lower part of the head body or the lower part of the needle bar mounting plate in accordance with the shape of the plate, that is, in a straight line if the needle bar mounting plate is straight, or in an arc shape if the needle bar mounting plate is arcuate. One thread end clamping device is provided on this bracket 6 so as to extend between all the needles, or a plurality of thread end clamping devices 7 are provided such that one thread end clamping device faces each needle bar. This consists of a bottom piece 7a installed between the lower parts of the bracket 6 and a clamping piece 7b that passes through the bottom piece 7a and slides up and down. is one large piece spanning all the needles, and if one device is provided opposite each needle, a plurality of small pieces are provided in a row equal to the number of needles as shown in FIG. This clamping piece 7b is made by bending a wire rod or a thin strip-shaped plate material into a U-shape, and passing both opposing legs 7c through the bottom piece 7a, so that the central part is on the lower surface of the bottom piece, and a spring is attached to both legs passed through the bottom piece. 8, the spring 8 has a lower part supported by the bottom piece and an upper part supported by the upper end of the leg of the clamping piece, and the bottom piece and the clamping piece are predetermined so that the clamping piece is always lifted upward by the spring pressure. It is designed to press into contact with the spring pressure. And this clamp piece 7
A solenoid, air cylinder,
A push-down means 9 such as a link is provided, and the push-down means is driven in synchronization with the advancement of the hook to be described later, and the clamping piece 7b is pushed down against the spring 8, and the clamping piece and the bottom piece are separated and opened, and in this state. Make sure that the hook of the hook is inserted. The end of the thread is hooked between the bottom piece and the clamping piece by a hook, and when the hook is retracted, the thread is inserted through the hook and when the hook is completely retracted, the drive of the push-down means is released and the spring pressure is applied. Hold it in place. In this case, in order to securely hold the thread end, use a sponge on either or both of the holding piece and the bottom piece.
An elastic material 10 such as felt may be provided. Note that the pressing means is provided on the bracket 6, the head body, or the like. The thread end hooking device 11 is located at the lower part of the head body 1 and extends downward from the needle tip toward the needle bar side by a driving source such as an air cylinder, cam, wire, solenoid, link device, etc. so as to project forward toward the needle side. establish. At this time, the tip of the thread end hook is inserted between the two bottom pieces and the clamping piece that are opened apart from each other, and protrudes below the needle tip to the needle thread position, and the thread end is held at the hook-shaped hook at the tip. When hooked at 11a and retreated, the projecting range is determined so that the position is slightly rearward from between the vertically opposed bottom pieces and the clamping pieces, and when this hook 11 moves forward in the projecting direction, it synchronizes with the hook. Then, the pressing means is driven so that the clamping piece is pressed down against the spring. Of course, when the pressing of the pressing means is released, the clamping piece is automatically restored by the action of the spring.

The one shown in FIG. 5 is a different embodiment in which a thick plate bottom piece is used, and this bottom piece 12 has vertical grooves 12.
a, a clamping piece 13 bent in a U-shape with a plate material is fitted thereto, the lower part of the clamping piece is used to clamp the yarn end, and the upper part can be pushed down by a pressing means,
In addition, a spring 8 is interposed between the top piece and the bottom piece,
Its operation and effect are the same as those shown in FIG.

According to the present invention, the end of the stop thread threaded through the waiting needle passes through the bottom piece at a position close to the needle tip, and the clamping pieces are vertically pressed against this bottom piece and pressed by a spring. Because the end of each stop thread does not unnecessarily slip out of the needle hole, the end of each stop thread does not unnecessarily slip out of the needle hole, and the thread end hooking device is operated by a solenoid, air cylinder, cam, link mechanism, etc. When moving forward, the thread end clamping device is simultaneously opened by the push-down means, and the thread end is inserted into the opened clamping device using a hook, so that the thread end can be securely clamped and the thread can be properly clamped. The clamping force allows embroidery, etc. to be performed reliably.

[Brief explanation of the drawing]

Figure 1 is a front view of the main parts, Figure 2 is a plan view, and Figure 3 is a front view of the main parts.
The figure is a perspective view, and FIGS. 4 and 5 are views of different embodiments. 1...Main body, 2...Needle bar mounting plate, 3...Needle bar,
4... Needle, 5... Presser foot, 6... Bracket, 6
a... Bottom piece, 7... Yarn end clamping device, 7a... Bottom piece, 7b... Clamping piece, 7c... Leg, 8... Spring, 9... Pressing means, 10... Elastic material, 11...
Yarn end hook, 11a... hook part.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a sewing machine in which multiple needles can be selectively used, the lower part of a bracket installed vertically below the main body of the sewing machine and at the rear of the needle bar. , a thread end clamping device and a thread end hooking device configured to hook the thread inserted into the needle hole and insert and clamp the thread end into the clamping device after cutting are provided opposite to each other, and the thread end clamping device The device is arranged in such a way that the bottom piece fixed to the bracket is opposed to the position where the end of the thread to be inserted into each needle is clamped, and a clamping piece is arranged on the lower surface of the bottom piece, and a spring is attached to the clamping piece, and a spring is attached to the upper part of the clamping piece. The clamping piece is moved away from the bottom piece against the spring pressure by means of a push-down means provided in the clamping device, and the tip of the hook is shaped like a hook, and the thread is inserted through the bottom piece and the clamping piece, which are opened when the clamping device is separated. A thread end clamping device for a sewing machine, which is provided so as to be movable forward and backward so that the thread end can be inserted therein, and in which a pressing means is driven to separate the clamping piece from the bottom piece in synchronization with the advancement of the hook. (2) A thread end clamping device for a sewing machine as set forth in claim 1 of the utility model registration claim, wherein a thread end clamping device is provided for each needle facing the needle. (3) A sewing machine according to claim 1 of the utility model registration claim, in which only one thread end clamping device is provided between all the needles, and the thread end held through any needle hole is clamped. Yarn end clamping device.