JP2000096419A - Yarn retaining mechanism for multi needle sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a yarn retaining mechanism capable of making a needle thread not have a bending habit even by retaining the needle threads. SOLUTION: This yarn retaining mechanism 1 of multiple needle sewing machine simultaneously retains plural needles threads each to be fed to plural needles and simultaneously releases the retention. The retention nips and holds the plural needle threads T by a pair of nipping and holding faces 13a and 14a. The mechanism is equipped with a driving mechanism 2 for adjusting a pair of the nipping and holding faces 13a and 14a so as to hold the needle threads T or releasing the faces so as to disengage the retention.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread holding mechanism for a multi-needle sewing machine which holds a plurality of upper threads supplied to a plurality of needles and releases the holding.

[0002]

2. Description of the Related Art Generally, in a multi-needle sewing machine, a needle thread comes off from each needle at the time of stitching back to return to a sewing position by returning to a seam or when switching a needle used for sewing. It has a thread holding mechanism that holds the upper thread so that it does not move.

[0003] Many of the conventional thread holding mechanisms of a multi-needle sewing machine include:
An independent clamp mechanism is provided for holding each upper thread, and each clamp mechanism is clamped by spring means. Then, only the clamp mechanism corresponding to the needle used for sewing is released from the clamped state.

For this reason, when passing the upper thread through the thread holding mechanism, the upper thread is passed with the other hand while the clamp mechanism is opened with one hand against the spring means. You have to work. As described above, it is necessary to work with both hands for each upper thread, which is troublesome. In addition, since a clamp mechanism is provided for each upper thread, the number of parts is large and the cost is high.

[0005] As a yarn holding mechanism that can solve this problem, the one disclosed in JP-A-8-60521 can be exemplified. As shown in FIG.
The first insertion hole 52 is disposed so as to cross the upper thread passage path of the sewing machine head 51 and allows the upper thread T to pass through the respective balances (not shown) toward the needle (not shown).
a is a holding plate 52 formed in the longitudinal direction by the number of needles.
And a slide plate 53 which is slidably overlapped with the holding plate 52 in the longitudinal direction and has the same number of second insertion holes 53a individually corresponding to the plurality of first insertion holes 52a in the longitudinal direction. Have. Elongated holes 53b are formed in the vicinity of both ends of the slide plate 53 in the longitudinal direction, and guide pins 54 are inserted into the respective elongated holes 53b.
Is screwed into the holding plate 52 to attach the slide plate 53 to the holding plate 52 so as to be movable in the longitudinal direction.

When the first insertion hole 52a of the holding plate 52 and the second insertion hole 53a of the slide plate 53 are aligned correspondingly, the upper thread T is allowed to pass, while the slide plate is The first insertion hole 52a and the second insertion hole 53a are displaced by slidably moving the 53 in the longitudinal direction, and the upper thread T inserted through both the insertion holes 52a, 53a is held by the holding plate 52 and the slide plate 53. When sandwiched, the upper thread T is held.

However, when the upper thread T is held, the upper thread T is bent in a crank shape as shown in FIG.
There is a problem that a bending habit is attached to the horn.

An object of the present invention is to solve the above-mentioned problems and to provide a thread holding mechanism of a multi-needle sewing machine which does not have a bending tendency even when the upper thread is held.

Another object of the present invention is to provide a thread holding mechanism of a multi-needle sewing machine which can reduce the number of parts.

Another object of the present invention is to provide a thread holding mechanism of a multi-needle sewing machine that can easily pass a thread.

[0011]

In order to achieve the above object, a thread holding mechanism of a multi-needle sewing machine according to the present invention does not substantially bend a plurality of upper threads supplied to a plurality of needles. Are held at the same time, and the holding is released at the same time.

The holding can be exemplified by an embodiment in which the plurality of upper threads are held by a pair of holding surfaces.

[0013] In addition, an embodiment may be exemplified in which a drive mechanism is provided that matches the pair of holding surfaces so as to hold the upper thread or separates the pair of holding faces so as to release the holding of the upper thread.

Further, a mode in which a cushion material is disposed on one or both of the holding surfaces can be exemplified. Examples of the cushion material include, but are not particularly limited to, rubber, soft resin, flocking sheet, cloth and the like.

[0015]

1 to 6 show a thread holding mechanism 1 of a multi-needle sewing machine according to a first embodiment. The sewing machine head 5 of the multi-needle sewing machine includes a movable block 6 slidably supported in the left-right direction on the front of a head frame 11.
A needle 7 is attached to the movable block 6 at the lower end.
Five needle bars 8 are supported so as to be able to move up and down, and fifteen balances 9 provided corresponding to each needle bar 8 are supported so as to be able to swing up and down. A yarn holding mechanism 1 is provided therebetween. Each needle 7 has an upper thread T unwound from a bobbin (not shown), a thread path device (not shown), and a thread guide 1.
0, the balance 9 and the thread holding mechanism 1 respectively. Then, by moving the head block in the left-right direction, any one of the needle bar 8 and the balance 9 is moved and driven in front of a drive mechanism (not shown) provided on the head frame 11.

The thread holding mechanism 1 includes a thread holding section 2 for holding the upper thread T, and a drive section 3 as a drive mechanism for driving the thread holding section 2.

As shown in FIGS. 5 and 6, the thread holding portion 2 is a frame 1 having an inverted U-shaped cross section and fixed to a movable block 6.
2 is provided. As shown in FIGS. 3 and 4, a first holding plate 13 having a holding surface 13 a is fixed to a rear wall inner surface 12 a of the frame 12, and a first holding plate 14 a having a holding surface 14 a is provided to a front wall inner surface 12 b of the frame 12. Two holding plates 14 are supported via a pair of links 15. The two plates 13 and 14 are provided so that their holding surfaces 13a and 14a are parallel to each other, and are guided from threading holes 12d provided in the upper wall 12c of the frame 12 in correspondence with the respective upper threads T. Needle thread T
The space between the two holding surfaces 13a and 14a is passed in parallel with the two holding surfaces. One end of the link 15 supporting the second holding plate 14 is connected to the inner surface 12 of the front wall of the frame 12.
In FIG. 2B, a pair of support portions 12e formed at both ends in the length direction of the frame 12 are rotatably supported via pins 16;
Pins 22 and 2 are attached to a pair of pin brackets 17 fixed to
It is rotatably supported via 3. As described above, the two holding plates 14 allow the second holding plate 14 to hold its holding surface 14a.
The horizontal movement is performed while maintaining a parallel state between the first holding plate 13 and the holding surface 13a.

On the inner surface 12b of the front wall of the frame 12, four guide pins 20 fixed with screws 19 are protruded between the two support portions 12e. A compression spring 21 for urging the first holding plate 13 is interposed. The entire clamping surface 14a of the second clamping plate 14 is moved by the four compression springs 21 to the first clamping plate 1.
3 so as to be evenly biased over the entire holding surface 13a.

The drive unit 3 includes a keep solenoid 2 fixed to the movable block 6 via a solenoid bracket 25.
6 is provided. The keep solenoid 26 has a solenoid shaft 26a directed downward. When a suction pulse is input, the keep solenoid 26 attracts the solenoid shaft 26a (retracts the solenoid shaft 26a) by the magnetomotive force of a built-in permanent magnet (not shown) and a built-in coil (not shown), Finally, the solenoid shaft 26a is attracted by the magnetomotive force of the permanent magnet (the state where the solenoid shaft 26a is retracted is maintained). When a recovery pulse is input, the keep solenoid 26 cancels the attraction by canceling the magnetomotive force of the permanent magnet by the magnetomotive force of another built-in coil (not shown), and recovers the solenoid shaft 26a ( The solenoid shaft 26a protrudes). When no power is supplied, the solenoid shaft 26a maintains the sucked (retracted) state or the restored (projected) state. The structure of the keep solenoid 26 is an example, and is not particularly limited.

At the end of the solenoid shaft 26a,
The solenoid lever 27 is rotatably connected to one arm 27a. The fulcrum 27b of the solenoid lever 27
Is a supporting portion 25a provided on the solenoid bracket 25.
Is rotatably supported. The other arm 27c of the solenoid lever 27 is bent so that the distal end side extends forward of the movable block 6. A concave portion 27d is provided on the distal end side and lower side of the arm 27c, and a slide shaft 28 is engaged with the concave portion 27d by an engaging pin 29 provided on one end side.
The slide shaft 28 is supported on the right wall 12f of the frame 12 so as to be slidable left and right, and a pin slide 30 formed in a hook shape is fixed to a side protruding into the frame 12. The right pin 23 in FIGS. 3 and 4 extends further below the link 15, and the pin slide 30 is engaged here. Through the pin slide 30, the drive unit 3 causes the pair of holding surfaces 13a and 14a of the thread holding unit 2 to be aligned with or separated from each other.

The operation of the thus configured yarn holding mechanism 1 will be described. First, when holding the released upper thread T, as shown in FIGS. 2 (two-dot chain line), FIGS. 3 and 5, the thread holding mechanism 1 first retracts the solenoid shaft 26a of the drive unit 3 and The one holding plate 13 and the second holding plate 14 are separated from each other, and the upper thread T is released. Here, when a recovery pulse is input to the keep solenoid 26 of the drive unit 3, the suction of the solenoid shaft 26a is released as shown by a solid line in FIG. Then, the solenoid lever 27, the slide shaft 28, and the pin slide 30
Keep solenoid 2 added to pin 23 through
Since the force of No. 6 is released, the second holding plate 14 is moved in the direction approaching the first holding plate 13 by the spring force of the compression spring 21. Then, as shown in FIG. 4 and FIG.
The upper thread T is held between 3a and 14a.

Next, a case where the upper thread T held as shown in FIGS. 4 and 6 is released will be described. When a suction pulse is input to the keep solenoid 26 of the drive unit 3 to release the upper thread T, the solenoid shaft 26a is sucked. Then, a force is applied to the pin 23 via the solenoid lever 27, the slide shaft 28, and the pin slide 30 in a direction to move the second holding plate 14 away from the first holding plate 13. Since this force is configured to overcome the spring force of the compression spring 21, the solenoid shaft 26a is retracted and sucked. At this time, the solenoid lever 27
Is rotated upward, and the slide shaft 28 is
2 in the direction of pulling out from the slide shaft 28
The pin 23 is moved in the same direction by the pin slide 30 fixed to the pin 23. Thereby, the second holding plate 14 is separated from the first holding plate 13, and the upper thread T is released as shown in FIGS.

The keep solenoid 26 of the drive unit 3 can manually move (protrude or retract) the solenoid shaft 26a, so that the state after the movement is maintained even when no power is supplied. . For this reason, in this thread holding mechanism 1, the recovery lever or the suction pulse is not input to the keep solenoid 26 of the drive unit 3, and the solenoid lever 27 is manually rotated downward or upward, and may be rotated. Holding the upper thread T,
You can also open it.

According to the yarn holding mechanism 1 configured as described above, the plurality of upper threads T supplied to the plurality of needles 7, respectively.
Is held by the holding surface 13a of the first holding plate 13 and the holding surface 14a of the second holding plate 14, which are oriented in parallel to the direction, so that they are not bent substantially at the same time. Since the holding is released, the upper thread T does not have a bending habit unlike the related art.

Further, a pair of holding surfaces 13a, 13a,
Since the drive unit 3 for aligning or separating the thread 14a is provided, the thread holding mechanism 1 is different from the conventional one in which each clamp mechanism must be released with one hand when each upper thread T is passed through the thread holding mechanism 1. The upper thread T can be easily passed through the mechanism 1 with one hand.

Further, since a plurality of upper threads T are held by being clamped by the clamping surface 13a of the first clamping plate 13 and the clamping surface 14a of the second clamping plate 14, a clamping mechanism is provided for each upper thread T. The number of parts can be greatly reduced as compared with the related art having the above, so that the cost can be reduced.

Next, FIG. 7 shows a thread holding mechanism 35 of the multi-needle sewing machine according to the second embodiment. The present embodiment is different from the first embodiment only in that a cushion material 36 is provided on the holding surface 14a of the second holding plate 14. The cushion material 36 is not particularly limited, and examples thereof include rubber, soft resin, flocking sheet, cloth and the like. According to the present embodiment, in addition to the effect of the first embodiment, even if the thickness of each upper thread T is uneven, the cushion material 36 absorbs the difference, so that all the upper threads T are securely held. Can be held.

The present invention is not limited to the configuration of the above-described embodiment, but may be embodied by appropriately changing the scope of the invention as follows, for example, as follows. (1) The compression spring 21 is omitted, and a plate-shaped magnet (for example, a plate-like magnet (for example, a plate-like material) in which powder or granular magnets are mixed is formed on one or both holding surfaces of the first holding plate 13 and the second holding plate 14. Rubber magnet). At this time, when one of the magnets is provided, the other holding plate is made of a ferromagnetic material, and when both of the magnets are provided, the directions of the magnetic poles are reversed.

(2) The upper thread T is clamped by moving both the first clamping plate 13 and the second clamping plate 14 relative to each other. (3) In the third embodiment, the cushion material 36 is provided on the holding surface 13a of the first holding plate 13 or on both the holding surface 13a and the holding surface 14a of the second holding plate 14.

[0030]

As described above in detail, according to the thread holding mechanism of the multi-needle sewing machine according to the first aspect of the present invention, the upper thread is not bent even when the upper thread is held. It works.

In addition to the above effects, according to the thread holding mechanism of the multi-needle sewing machine according to the second aspect of the present invention, the number of parts can be reduced.

In addition to the above effects, according to the thread holding mechanism of the multi-needle sewing machine according to the third aspect of the present invention, the upper thread can be easily passed through the thread holding mechanism.

In addition to the above effects, according to the thread holding mechanism of the multi-needle sewing machine according to the fourth aspect of the present invention, even if the thickness of each upper thread is not uniform, all the upper threads can be reliably held. it can.

[Brief description of the drawings]

FIG. 1 is a front view of a thread holding mechanism of a multi-needle sewing machine according to a first embodiment of the present invention.

FIG. 2 is a front view showing a driving unit of the yarn holding mechanism.

FIG. 3 is a bottom view showing a state where the thread holding mechanism has released the upper thread.

FIG. 4 is a bottom view showing a state where the yarn holding mechanism holds the upper thread.

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 4;

FIG. 7 is a view similar to FIG. 5, illustrating a thread holding mechanism of a multi-needle sewing machine according to a second embodiment of the invention.

FIG. 8 is a perspective view showing a thread holding mechanism of a conventional multi-needle sewing machine.

FIG. 9 is a cross-sectional view showing a holding state of the yarn when the yarn holding mechanism is viewed from the front.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thread holding mechanism 3 Drive part 7 Needle 13a Nipping surface 14a Nipping surface 36 Cushion material T Upper thread

Claims (4)

[Claims] 1. A thread holding device for a multi-needle sewing machine configured to simultaneously hold a plurality of upper threads supplied to a plurality of needles substantially without bending, and to release the holding at the same time. mechanism. 2. The thread holding mechanism of a multi-needle sewing machine according to claim 1, wherein the holding is performed by holding the plurality of upper threads with a pair of holding surfaces. 3. The thread holding mechanism for a multi-needle sewing machine according to claim 1, further comprising a drive mechanism for aligning the pair of holding surfaces so as to hold the upper thread or separating the holding faces so as to release the holding of the upper thread. . 4. The thread holding mechanism for a multi-needle sewing machine according to claim 1, wherein a cushion material is provided on one or both of the holding surfaces.