JPH0211277B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a multi-needle sewing machine in which a thread take-up is provided for each needle, and only the thread take-up corresponding to the needle that moves up and down is selectively driven. The invention relates to a balance device.

[Conventional technology and its problems]

Conventional embroidery sewing machines have been equipped with a plurality of needles per sewing machine so that thread colors can be changed quickly. It would be ideal to have a thread take-up for each needle, but in order to simplify this configuration, one thread take-up is provided for each sewing machine so that it can swing freely. Hook it up, swing all the threads up and down at the same time, and repeat only the threads that correspond to the needle in the fixed position.Other threads simply swing with the up and down movement of the thread take-up, but do not let the threads pay out. There is. In this method, all the threads swing at the same time, so in the case of loose threads such as tinsel thread, adjacent threads often get entangled with each other and become tangled, resulting in thread breakage. In addition, the yarn in a resting state is constantly moved up and down by the drive of the thread take-up, that is, it repeats tension and relaxation, making it more likely to break. To prevent this, there is a method of providing a thread take-up for each thread. In this system, a fan-shaped or ordinary spur gear is integrally formed at the rear end of each balance, and this gear is selectively meshed with a drive gear at a fixed position to cause the balance to swing.
In this method, it takes time to move the plurality of take-up levers in the lateral direction and mesh the drive gear with the take-up side gear, and it also takes a lot of effort to manufacture and adjust the take-up.

The present invention relates to this improvement, and aims to quickly and reliably perform rocking engagement in a fixed position with a simple structure.

[Means for solving problems]

A needle bar mounting plate with a plurality of needle bars attached thereto, and a plurality of thread take-up levers disposed vertically opposite each needle bar are attached to and supported on a shaft rotatably supported by the head frame, The needle bar and the thread take-up can be selectively stopped at a fixed position, and the thread take-up when it comes to a fixed position is automatically locked with a locking pin of a swing link.

〔Example〕

Next, the present invention will be explained with reference to illustrated embodiments.

In the figure, reference numeral 1 denotes a head frame of a sewing machine having a desired shape, and in a multi-head sewing machine, a large number of head frames 1 are arranged at predetermined intervals. In the illustration, only the frontal region of one animal is shown. Reference numeral 2 denotes a drive shaft that is disposed so as to pass through a plurality of adjacent head frames 1 in the horizontal direction, and this drive shaft 1 has a cam 3 for raising and lowering the thread take-up and a cam for raising and lowering the needle bar for each head frame. The cams 3 and 4 are wedged or fixed as a set, and when the drive shaft 2 rotates, these cams 3 and 4 also rotate together in synchronization.

This cam 3 is disc-shaped, and has a cam groove 3a formed on its side or outer circumferential surface that is suitable for lifting and lowering the thread take-up.The cam 4 has a shape that is suitable for lifting and lowering the needle bar. 5a is fitted in a slidable manner.

Reference numeral 5 denotes a swinging link, which is located at the sewing position of the sewing machine and is swingably supported at its midpoint by a spindle 6 on a part of the head frame 1, and a cam follower 5a protruding from the base end of this link 5. Cam groove 3a of the cam 3
When the cam 3 rotates, the link 5 slides and rotates along a cam groove 3a having a predetermined shape, thereby causing the link 5 to swing around the support shaft 6. A locking pin 7 is provided at the tip of the swing link 5 and protrudes through the link in the lateral direction, and both ends of the locking pin 7 are tapered. The locking with the fork-shaped locking portion 8a is reliably performed.

Reference numeral 8 denotes a balance, which is swingably supported on a bracket 10 via a support shaft 9, and a fork-shaped locking portion 8a is formed on the base end side of the balance 8. The locking pin 7 of the link 5 is fitted and locked. When a sewing machine has a plurality of needles in one head, the number of thread take-up levers 8 corresponding to the number of needles is provided. For example, if there are 5 needles in one head, the 5 thread take-up levers 8 are arranged vertically opposite each other, and the bracket 1
In this case, as shown in FIG. 2, the adjacent balances 8, 8 are arranged at a predetermined interval, and the The one in the fixed position locks with the locking pin of the swing link and swings. Bracket 1
The upper part of 0 is fixed to the arm 11 which is fixed to the shaft 12 by the boss part 11a, so that the arm 11,
Each balance 8 is suspended from above via a bracket 10 so as to be swingable on a support shaft 9. The shaft 12 is vertically supported at two points, the upper and lower parts of the head frame 1, and is rotatable by bearings 13 and 14 provided oppositely at the upper and lower parts of the head frame 1. Supported.

Reference numeral 15 denotes a needle shaft mounting plate, which is fixed to the shaft 12 with a fixture 16 protruding from the top of this plate, and a plurality of needle bars 17 are provided on this plate. This needle bar 17
are arranged at fixed pitches along the outer circumferential surface of a needle bar mounting plate 15 which is rotatably supported around a shaft 12, and each needle bar is fixed in the vertical direction by a holder 18 and a bracket 19 protruding from this plate. The needle N is slidably supported and fixed to the lower end of the needle bar. Further, each needle bar 17 is provided with springs S ₁ and S ₂ .

Reference numeral 20 denotes a needle bar push-down tool. This push-down tool 20 is locked by the swing link 5 and is disposed below the thread take-up lever at the swinging sewing position (fixed position), and moves in the vertical direction. to push down the upper end of the needle bar 17 at the sewing position. This push-down tool 20 is fitted onto the shaft 12 and is slidable in the vertical direction of the shaft 12, and a push-down pin 20 is provided at the tip of the push-down tool 20 to protrude in the horizontal direction. In the case where the needle bar is inserted into the fork part 17a protruding from the upper part of the needle bar in a fixed position and is locked, the needle bar can be pushed down, and when the pushing force is released, the needle bar returns to its original state due to the spring. When raised by pressure, the pusher 20 is also raised together via the fork portion 17a and the pusher pin 20a.
Moreover, this push-down tool 20 is made to perform an upward and downward movement in a fixed position. Various methods can be considered for this, but in the illustrated embodiment, a guide rod 21 is established on the bracket 36 that supports the lower part of the shaft 12, and the push-down tool 20 is slidably inserted into this guide rod to move it up and down while keeping it in a fixed direction. I try to exercise.

The push-down tool 20 is simply inserted into the shaft 12 so as to be able to freely slide in the vertical direction, and in order to raise and lower the push-down tool 20, it is engaged with the elevating body 22 fitted into the shaft 12 at a lower position of the push-down tool 20. make it stop This elevating body 22 is fitted onto the shaft 12 so as to be slidable in the vertical direction, and is locked with a locking rod 23 provided on the push-down tool 20. The locking rod 23 is slidably pivotally connected to the push-down tool 20 via a shaft 24, and a spring _S3 is interposed between one end of the locking rod 23 and the push-down tool 20, and the locking rod 23 is moved by the spring pressure. Press the hook 23a on the lower end side toward the elevating body. A hook 22a is also provided in a protruding manner on this elevating body 22, and is engaged with a hook 23a of a locking rod 23 which is pressed by a spring _S3 .

Further, a lever 26 that swings or rotates by a solenoid 25 or other drive source is installed on the head frame 1 opposite to the locking rod 23, and when the lever 26 is rotated by the operation of the solenoid 25, the tip of the lever When the locking rod 23 is pressed against the spring _S3 , the locking rod 23 swings about the shaft 24, thereby releasing the hook 23a from the hook 22a of the elevating body 22. Do it like this.

The tip of the link 37 is attached to the elevating body 22, and the base end of the link 37 is pivotally connected to a part of the head frame, and the link 37 is pushed down by the rotation of the cam 4 and raised (the rising is done by a spring). As a result, as the cam 4 rotates, the elevating body 22 moves up and down via the link 37 using the shaft 12 as a guide. This elevating body 22 always moves up and down by the rotation of the cam 4, but when the locking rod 23 is swung by the lever 37, the hooks 23a and 22a are unlocked, so only the elevating body moves up and down. However, the unlocked push-down tool does not move up and down, but remains in a stopped state.

A cover 27 is attached to the head frame so as to cover the front part of the head frame. On the front surface of the cover 27, there is a vertical groove 28 for vertically guiding and swinging the thread take-up 8 at a fixed position (sewing position), and a plurality of thread take-up threads 8, 8, arranged in parallel. A lateral groove 29 is formed in a cross shape to hold it in a standby state and allow it to move laterally, and guide pieces 29a are provided on the upper and lower outer surfaces of the lateral groove 29.
29b are opposed to each other, and these guide pieces 29a, 29
The upper and lower surfaces of the other balance 8 in the standby position are supported at point b.

Note that instead of the guide pieces 29a and 29b, a guide rail 30 for supporting the lower surface of the balance 8 in a standby state is installed between the balances 8 arranged in parallel as shown in FIG.
and this guide rail 30
It is also possible to support the head frame with an arm 31 that projects from the head frame.

32 is a presser foot protruding from the lower end of each needle bar; 33
34 is a thread end holding device for hooking and holding the needle thread end; 34 is a rotating device for rotating and stopping the needle bar mounting plate one pitch at a time; 3;
Reference numeral 5 indicates a thread guide protruding from the front surface of the cover. Thread guide holes are bored in this thread guide 35, and the number of thread guide holes is the same as the number of needle bars and thread take-up levers.

To change colored threads in the thread take-up device configured as described above, the needle bar mounting plate 15 is rotated about the shaft 12, and the needle bar with the desired colored thread inserted into the needle is brought to a fixed position and then stopped. let When this needle bar mounting plate is rotated, the shaft 12 to which it is fixed also rotates, so that the arm 11 and the bracket 1 can be moved from this shaft 12.
0, one take-up lever is provided facing each needle bar.The take-up lever also moves within the horizontal groove of the cover, and the take-up thread facing the needle bar through which the desired color thread is inserted is in a fixed position, that is, vertically. It will stop at the groove 28 position. All other balances are held at standby positions by guide pieces 29a and 29b. And the fork-shaped locking part 8a on the proximal end side of the balance in this fixed position.
is locked to the locking pin 7 of the swing link. This is the locking pin 7 of the swing link that is stopped at the fixed position.
The positional relationship between the two is predetermined so that the locking portion 8a of the balance is automatically inserted when it comes to the normal position.

〔Effect of the invention〕

According to the present invention, a needle bar mounting plate on which a plurality of needle bars are mounted is mounted on a shaft rotatably supported on a head frame, and a plurality of thread take-up levers are disposed vertically opposite each needle bar. The needle bar and thread take-up can be selectively stopped in a fixed position, and the locking pin of the swing link is automatically locked with the thread take-up when it comes to a fixed position. It has the advantage that replacement is quick and easy, and the balance in a fixed position and the needle bar can be driven reliably.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view, FIG. 2 is a plan view, FIG. 3 is a front view, and FIG. 4 is a different embodiment. 1 is a head frame, 2 is a drive shaft, 3 and 4 are cams, 5 is a swing link, 6 and 9 are support shafts, 7 is a locking pin, 8 is a balance, 12 is a shaft, 15 is a needle bar mounting plate, 1
7 is a needle bar, 20 is a pusher, 21 is a guide, 22 is an elevating body, 23 is a locking rod, 26 is a lever, 27 is a cover, 28 is a vertical groove, and 29 is a horizontal groove.

Claims (1)

[Claims] 1. A needle bar mounting plate with a plurality of needle bars attached to the bottom of a shaft rotatably supported on the head frame.
The upper part is equipped with a plurality of take-up levers via brackets, and the needle bar mounting plate and the take-up take-up are placed vertically opposite each other.
By rotating the shaft, the thread take-up lever and the needle bar paired with it are selectively stopped at a fixed position, and each thread take-up lever is equipped with a fork-shaped locking part at the rear end, so that it can be stopped at a fixed position. It can be engaged with the locking pin of the swing link that swings when the cam rotates, and the other balances other than the normal position are supported by being inserted into the horizontal groove provided in the cover, so that the top and bottom of the balance can only be moved in the normal position. 1. A take-up device for a multi-needle sewing machine, characterized in that a vertical groove for allowing movement is formed in the cover so as to intersect with the horizontal groove.