JPS61658A - Needle thread brake apparatus in embroidering machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) This invention relates to a multi-needle type embroidery sewing machine in which a plurality of sewing needles are arranged in parallel and moved horizontally for thread change.
The present invention relates to a needle thread restraining device for preventing unauthorized operations such as the needle thread being pulled and dislodged from the sewing needle when changing the thread, or loosening near the sewing needle.

(Problems of the Prior Art to be Solved by the Invention) Conventional embroidery sewing machines of this type are not equipped with a mechanism to prevent and cover the above-mentioned incorrect operation of the upper thread. Due to the movement of the thread take-up or the swinging action of the thread take-up while waiting or moving for jump stitching, the thread may hang down from the thread path or be pulled and move backwards, causing the sewing machine to sew 2! There was a problem with the thread coming off.

(Means for Solving the Problems) An object of the present invention is to prevent the above-mentioned problems by stopping the upper thread Hf&
To provide a sewing machine head body in which a needle bar case in which a plurality of needle bars are suspended in parallel is selectively transferred to a sewing button fixed to each needle bar to a needle base position. In an embroidery sewing machine installed so as to be horizontally movable in front of the sewing machine, the upper threads inserted into each needle pass through each thread path when sewing in front of the needle bar case. In order to releasably hold down the threads, each stopping member is disposed opposite to each of the needle bars and supported so as to be controllable in forward and backward movement at a position corresponding to the needle head, respectively, with respect to the gold needle bar case. That is.

(Function) The device of the present invention holds down each needle thread at a standby position with each stopping member disposed facing each needle bar in the middle of the thread path through which the needle thread passes during sulfuric acid, and also stops each thread at a standby position. The member is controlled to move forward and backward at a position corresponding to the needle base, so that the upper thread can be held down when the thread is not sulfuric acid and released when it is sulfuric acid.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings. In the figure, 1 is the main body of the sewing machine head H, and 2 is the main body of the sewing machine head H in the left-right direction from the front of the main body 1 via the guide rails 1a and ia. The needle bar case is installed horizontally movably, and a plurality of needle bars 4 each having a sewing needle 3 fixed to its lower end are vertically slidable and suspended in parallel, and the sewing needle 3 is moved to the needle base position. Movement is controlled via a drive mechanism (not shown) in order to selectively transfer and move up and down at the needle base position.

The needle thread U pulled out from a bobbin (not shown) fixedly placed above the main body 1 is attached to a thread take-up which is swingably supported to adjust the sulfuric acid tension of the needle thread () against the upper end of the needle bar case 2. The upper thread U, which is inserted into the titer 3 through thread guiding members 6 and 6 supported near the center and lower end of the needle bar case 2 and through the sewing needle 3 at the needle base position, moves vertically of the sewing needle 3. Then sew the bobbin! The sewing needle 3 is in the standby position while passing through the thread passage 7 leading to the needle 13 and being sewn onto the fabric.
The thread end U1 of the upper thread U inserted into the main body 1 is pulled to pull the thread end U1 hanging down from the sewing needle 3 to the 4 end before moving from the needle base position to the standby position after the sulfuric acid operation is completed. A pulling member 8a is tilted so as to be movable forward and backward with respect to the lower end thereof, and a gripping member is arranged parallel to the lower end of the needle bar coos 2 facing each needle bar 4 in order to grip the pulled up thread end U1 above. The thread end gripping device 8, which includes a member 8b, is held in a retracted position above the secondary opening 3.

Reference numeral 9 denotes a support shaft rotatably suspended horizontally via a bracket 10 to a guide plate 1b vertically installed at the front end of the main body 1,
A swinging lever 11 extending rearward is fitted to one end of the needle bar 4 located at the needle base position, and a pushing lever 12 extending downward is fitted to the other end. is the swing lever 11
The push lever 12 is always urged toward the main body 1 by a spring 13 wound around the support shaft 9.

14 is attached downward to the guide plate 1a in order to control the swinging of the pushing lever 12 together with the swinging lever 11! This solenoid is arranged above the swinging lever 11, and when the solenoid 14 is energized and the operating shaft 14a is moved downward, the swinging lever 11 is tilted downward and the pushing lever 12 is moved to the needle bar case. At the same time, the solenoid 14 is demagnetized and the operating shaft 14a is released, and when Ic, the swing lever 1
1 is tilted upward, and the push lever 12 is returned to the main body side.

Reference numerals 15 to 15 designate each needle bar 4 with respect to the needle bar case 2 in order to releasably hold down the needle thread U at a midway point in front of the needle bar case 2 of each thread passage 7 through which each needle thread U passes during sulfuric acid. Each of the restraining members 15 is fitted and supported so as to be independently movable in the front-rear direction, facing each other, and each of the restraining members 15 is attached rearwardly to each rear end portion 15a of the sub-rod 2 that projects rearward. Each spring 16 is wound around the spring 16 for biasing the needle bar case 2, and each of the springs 16 protrudes toward the front of the needle bar case 2 through a plate-shaped elastic member 17 attached laterally to the front surface of the needle bar case 2. At the front end portion 15b, holding pieces 18 to 18 are bent in the lateral direction along the elastic member 17 in order to releasably elastically pinch the upper thread U between the elastic member 17 and the elastic member 17. The needle bar case 2 is arranged in front of the needle bar case 2. Then, each of the restraining members 15 jointly moves in the left-right direction with the sub-bar case 2, and the pressing pieces 18 of each of the restraining members 15, which are disposed opposite to the needle bar in the standby position, are in pressure contact with the elastic member 17, respectively, and While holding down the thread head at a midway portion of the thread path 7, the rear end portion 15a of a stopping member 15 at a position corresponding to the needle base, which is provided opposite to the needle bar 4 at the needle base position, faces the pushing lever 12, and When the pushing lever 12 is energized and the pushing lever 12 is swung toward the needle bar case 2 side, the blocking member 15 moves forward, the blocking piece 18 separates from the elastic member 17, and the upper thread U can advance during the sulfuric acid operation. To be released.

Next, the operation and effects of the embodiment having the above configuration will be explained.

Now, in this example, in the middle of each thread passage 7 through which the upper thread U inserted into each sewing needle 3 passes during sulfuric acid in front of the needle bar case 2, each upper thread opening is releasably held in place. The one-needle bar case 2 is opposed to each stop member 15, which is supported so as to be able to move forward and backward at the needle base position, facing each button frame.

For this reason, each upper thread (J is the respective stopping member 1) at the standby position.
5 is braked to ensure that its forward and reverse movement is regulated.
This has the effect of preventing problems in which the upper thread opening loosens and hangs just in front of the sewing needle 3, or is pulled in the opposite direction and comes off from the sewing needle 3.

In addition, since the upper thread head at the needle base position can be stopped or released arbitrarily by controlling the operation of the solenoid 14, the upper thread head at the needle base position can be stopped or released at will.
When the jump sewing stop is stopped while moving, or when the thread breaks, it returns to the state before the thread broke.1! Even if tension is applied to the thread U due to the swinging motion of the thread take-up 5 when the thread take-up is stopped for thread thread 1, the reverse movement of the needle thread (1-thread 1) in the thread path 7 is restricted, and the upper thread (i! It is possible to prevent the thread from being pulled out from 13.

(Effects of the Invention) In other words, in the present invention, a needle bar case in which a plurality of sub bars are vertically arranged in parallel selectively transfers sewing needles fixed to each needle bar to the nail base position. In an embroidery sewing machine that is installed horizontally movable in front of the sewing machine head,
The side bar case is located in the middle of each thread path, through which the needle thread inserted into each sewing needle passes in front of the needle bar case during sulfuric acid, to releasably hold down each needle thread. On the other hand, by arranging a part of each control rod, which is supported so as to be able to control advance and retreat at a position corresponding to the needle head, to face each needle bar, the movement of each needle thread at the standby position can be controlled. It is possible to arbitrarily restrict and deregulate the movement of the upper thread at the original position t1 to prevent the weft from moving backwards or loosening.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of the main parts, FIG. 2 is a side view of the sewing machine head, FIG. 3 is a plan view of the main parts, and FIG. 4 is a view of the main parts. Fig. 5 is the same <Y-Y line view. 1... Sewing machine head body 2... Needle bar case 3... Sewing needle 4... Needle bar 7... Thread passage 15... Stopping member U... Upper thread Applicant: Tokai Kogyo Sewing Machine Co., Ltd. Company agent Patent attorney Oka 1) HidehikojfE4 Figure 5

Claims (1)

[Claims] A needle bar case in which a plurality of needle bars are suspended in parallel is installed so as to be horizontally movable in front of the sewing machine head body in order to selectively transfer the sewing needles fixed to each needle bar to needle base positions. In the embroidery sewing machine, each needle thread inserted into each sewing needle is releasably held in a midway portion of each thread path through which the needle thread is passed during sewing in front of the needle bar case. In order to achieve this, an upper thread restraining device is provided in which respective restraining members are disposed opposite to the needle bar case and are supported so as to be able to control forward and backward movement at positions corresponding to the needle heads, respectively, facing the respective needle bars.