JP2000064169A - Multi-needle embroidery machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a thread-taking up member in a multi-needle embroidery machine to exert the original function sufficiently, and further to solve the difficulty of a threading work caused freshly by the improvement. SOLUTION: This multi-needle embroidery machine has at least one sewing machine head 1, plural needle bars and a plural balances corresponding to the needle bars. Needle thread-converting parts 18 are installed at the upstream of each balance in the needle thread passage respectively. Thread-taking up members 25 are correspondingly arranged at each needle thread-converting part 18. The postures of the thread-taking up members 25 are constituted so as to be changed all together.

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 having one sewing machine head having a plurality of needle bars and corresponding balances. More specifically, the present invention relates to a needle thread path supplied to the needle bars. The present invention relates to a multi-needle embroidery sewing machine with an improved arrangement of thread take-up members.

[0002]

2. Description of the Related Art In a sewing machine that performs lock stitching under the cooperation of a vertical movement of a sewing needle and a rotary hook, the lowering sewing needle pierces a work to reach a bottom dead center, and The tip of the sword of the outer hook catches the upper thread at the timing when it starts to rise. Then, by the subsequent rotation of the outer hook, the upper thread passes through the hook and passes through the engaging portion between the inner hook and the hook support to join the lower thread from the bobbin accommodated in the inner hook and Sewing with the lower thread is formed. In this process, the needle thread needs to be appropriately loosened and pulled up, and this action is given by the balance, but a rapid change in tension acting on the needle thread cannot be followed only by the balance. Therefore, a thread take-up member is provided as a member that absorbs a sudden change in tension of the upper thread.
(It refers to what is called a "thread take-up spring" because it is conventionally composed of a torsion spring). In a general industrial sewing machine or a household sewing machine, this thread take-up member is arranged immediately upstream of the thread balance, which is located in the path of the upper thread.

[0003]

By the way, in the multi-needle type embroidery sewing machine which is of the lock stitch type and has a plurality of needle bars on one sewing machine head, there is a limitation in the arrangement space. The thread take-up member is arranged upstream of the thread guide. However, the yarn guide is arranged further upstream than the upper yarn turning portion provided on the upstream side of the thread balance located in the upper yarn path. Therefore, the upper thread supply path is inevitably bent many times due to the balance and the thread removing member. For this reason, the contact resistance of the upper thread at the bent portion is large, and the reaction of the thread take-up operation by the thread take-up member is reduced. As a result, the original function of the thread take-up member is not fully exerted, which causes a problem of thread breakage.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned drawbacks of the prior art, and has been improved so that the original function of the thread take-up member can be sufficiently exhibited. SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-needle embroidery sewing machine in which the difficulty of the threading operation newly caused by this improvement is eliminated.

[0005]

In order to overcome the above-mentioned problems and effectively achieve the intended purpose, the present invention provides at least one sewing machine head with a plurality of needle bars and a plurality of balances corresponding thereto. In a multi-needle embroidery sewing machine equipped with, each upper thread turning section is arranged upstream of each balance in the upper thread path, and a thread take-up member is correspondingly arranged at each upper thread turning section. It is characterized in that the posture can be changed.

[0006]

Since the thread take-up member is provided in the needle thread turning portion upstream of the thread take-up path in the needle thread path, there is only one bent portion of the needle thread between the thread take-up member and the thread take-up member, and the bending that acts on the needle thread is performed. There is little resistance. Therefore, the tension fluctuation of the upper thread downstream of the balance is directly transmitted to the thread take-up member, and the original function of the thread take-up member is sufficiently exhibited. When threading,
By changing the postures of the thread take-up members all at once, the threading operation can be performed easily and quickly.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the accompanying drawings, with reference to an embodiment applied to a multi-head multi-needle embroidery sewing machine having a plurality of multi-needle heads. For example, FIG. 1 is a front view showing one of a plurality of sewing machine heads 1 in a multi-head multi-needle embroidery sewing machine. The plurality of sewing machine heads 1 are attached to respective sewing machine arms 2 (see FIG. 2) provided corresponding to the front surface of a long sewing machine frame (not shown) extending in the lateral direction via a support case 3. It is supported so that it can slide laterally. A plurality of needle bars 5 (six in the embodiment) are supported on the support case 3 so as to be vertically movable, and a balance 7 corresponding to the needle bars 5 is provided.
(Six in the embodiment) are swingably supported. The supporting case 3 is laterally slid by a driving device (not shown) so that the selected one needle bar 5 and the balance 7 are driven in cooperation with a driving mechanism incorporated in the sewing machine arm 2. Has become.

An adjusting table 11 is fixed to the upper part of the support case 3 in an inclined state, and each needle bar 5 is provided on the front surface of the adjusting table 11.
1st thread tension 12 and 2nd thread tension 1 corresponding to (balance 7)
3 is attached. The respective thread tensions are well known, and the first thread tensioner 12 elastically presses two tension disks against each other by a spring, and the elastic force of the spring can be adjusted to change the pressure contact force. Has become. The second thread tension member 13 can change the rotational resistance of the rotary dish by pressing the rotary dish around which the thread is wound with a spring and adjusting the elasticity of the spring.

As shown in FIG. 2, the upper yarn path 14 and the lower yarn path 1 are provided at the upper edge and the lower edge of the support case 3.
6 are arranged correspondingly, and thread holes 14a, 16a (6 each) corresponding to each needle bar 5 are formed in these thread paths 14, 16. A middle yarn path 15 is arranged below the middle between the upper yarn path 14 and the lower yarn path 16. This middle thread 15
As shown in FIGS. 3 (a) and 3 (b), includes a vertical portion 15a fixed to the front surface of the support case 3 and a horizontal portion 15b integrally formed with the horizontal portion 15b and extending horizontally. Part 15b
The thread holes 15c and the slits 1 corresponding to the respective balances 7
5d is formed. As shown in FIG. 4, an upper thread turning portion 18 is disposed above each slit 15d, and the upper thread turning portion 18 has two thread guide bodies 2 each having a thread hole 20a.
It is composed of 0 and 20. These two thread guides 2
Nos. 0 and 20 are provided with a predetermined gap so as to straddle the slit 15d.

Below the horizontal portion 15b of the intermediate thread passage 15, as shown in FIGS. 4 and 5, the thread take-up assembly 22 is provided.
Is provided. In this thread take-up assembly 22, the thread take-up units 21 corresponding to the respective balances 7 are set in the same number as the number of the balances 7 (needle bars 5). As shown in FIG. 5, the thread take-up assembly 22 includes a support shaft 23 supported rotatably and axially slidably between support plates 15e, 15e hanging from both ends of a horizontal portion 15b. It is composed of six thread take-up units 21 attached to 23.

As shown in detail in FIGS. 6 and 7, each thread take-up unit 21 is basically composed of a thread take-up member 25 formed by spirally winding a spring steel wire, a stopper member 26, and a spring strength adjusting member 27. Is configured. The thread take-up member 25 includes an arm portion 25a formed in a closed loop shape at one end of a spiral winding portion 25c and protruding in the radial direction, and a locking portion 25 in which the other end of the spiral winding portion 25c is axially protruded.
and b. The spring strength adjusting member 27 is configured as a cylindrical member, and the center hole 27a (FIG. 6) rotatably fitted to the support shaft 23 and the spiral winding portion 25c of the thread take-up member 25 are loosely fitted. Mounting hole 27b (FIG. 7) and a locking hole 27c into which the locking portion 25b of the thread removing member 25 is fitted.
(FIG. 6). The stopper member 26 is fitted with a central hole 26a that is rotatably fitted to the support shaft 23, and a reduced diameter step portion 35 formed on the outer circumference of the opening edge of the mounting hole 27b of the spring strength adjusting member 27. The annular wall 26b is formed with a cutout portion 26c formed over a required central angle.

FIG. 6 is a sectional view showing a state in which the thread take-up member 25, the stopper member 26 and the spring strength adjusting member 27 in FIG. 7 are assembled. That is, the spiral winding portion 25c of the thread take-up member 25 is axially inserted into the mounting hole 27b of the spring strength adjusting member 27, and the locking portion 25b thereof is provided.
Is fitted into a locking hole 27c formed in the spring strength adjusting member 27. Further, when the annular wall 26b of the stopper member 26 is fitted to the reduced diameter step portion 35 of the spring strength adjusting member 27,
A semi-arc gap is formed between the notch 26c of the stroke adjusting member 26 and the end surface of the spring strength adjusting member 27, and the arm portion 25a of the thread take-up member 25 projects from this gap. The stopper member 26 and the spring strength adjusting member 27 are fixed to the support shaft 23 by tightening a screw 29 inserted into a screw hole formed in the side peripheral surface of the adjusting member 27.

As shown in FIG. 8, the spring strength adjusting member 2 is provided.
7 is rotated counterclockwise to bring the root portion of the arm portion 25a of the thread take-up member 25 into contact with the stopper portion 26d formed in the cutout portion 26c of the stroke adjusting member 26, and then the spring strength is further increased. The strength of the spring of the thread removing member 25 can be arbitrarily set depending on the angle at which the adjusting member 27 is rotated. Moreover, the arm portions 25a of the thread take-up members 25 are aligned in the same posture by aligning the angular positions of the respective stopper members 26 to be the same.
(See Figure 4). Further, each thread take-up unit 21 is attached to the support shaft 23.
As shown in FIG. 5, the arm portions 25a of the thread take-up members 25 of the respective thread take-up units 21 are placed directly below the respective upper thread turning portions 18, that is, immediately below each slit 15d, as shown in FIG. It is set to correspond.

The support shaft 23 on which the thread take-up assembly 22 is externally inserted is rotatable and axially slidable between the support plates 15e, 15e as described above.
As shown in, the lever 30 is fixed to the end portion protruding from the right side support plate 15e. Further, as shown in FIG. 5, a compression coil spring 31 is elastically interposed on the support shaft 23 between the left support plate 15e and the left end thread take-up unit 21, and the elastic force causes the right end thread take-up unit 21 to move axially to the right. It is urged to contact the support plate 15e. In this state, the lever 30 is separated from the support plate 15e as shown in FIG. As shown in FIG. 11, the right end surface of the spring strength adjusting member 27 of the thread take-up unit 21 located at the right end and the support plate 1 located at the right side.
The left end surface of 5e has a clutch portion 3 which can be engaged at the time of engagement.
2,34 are formed. Both clutch parts 32, 3
Reference numeral 4 always meshes with the elastic force of the compression coil spring 31 to regulate the free rotation of the support shaft 23. Then, by simply rotating the lever 30, the clutch portions 32 and 34 move at an angle of 1 pitch,
Next, by raising and lowering the lever 30, the support shaft 2
3 can be rotated.

[0015]

Next, the operation of the multi-needle embroidery sewing machine according to the preferred embodiment described above will be described. Thread spool (not shown) set above the back of the sewing machine head 1.
The upper thread a fed from the above is supplied to the upper portion of the adjusting table 11 through a predetermined thread guide. As shown in FIG. 1, the upper thread a is formed by the first thread tension member 12 on the adjusting base 11,
Second thread tension 13, thread hole 14a of upper thread path 14, intermediate thread path 1
5, the thread hole 7a of the thread take-up 7 and the thread hole 16a of the lower thread path 16 are passed in this order, and then through the thread hook 5a of the needle bar 5 to the eye hole of the sewing needle 4. How to pass the upper thread a through the middle thread 15 will be further described. As shown in FIG. 9, the upper thread a is the thread hole 20 in the thread guide body 20 on the right side that constitutes the upper thread turning portion 18.
After being passed through a, the arm portion 25a of the thread take-up unit 21
Through the threaded hole 20a of the thread guide body 20 on the left side.

When performing the threading operation through the intermediate thread path 15, as shown by the solid line in FIG. 3 (b), the lever 30 is pulled toward the front to rotate the support shaft 23 to rotate the support shaft 23. The tip portion is aligned with the thread hole 20a of the thread guide body 20. Then, the thread holes 20a of the thread guide bodies 20 on both sides and the tip of the arm portion 25a are aligned in a horizontal row, so that the upper thread a can be easily passed from the right side, as shown in FIG. . After the threading operation to this portion is completed, the arm 30a of each thread take-up member 25 is returned to the normal posture by returning the lever 30 as shown by an imaginary line in FIG. 3 (a). As described above, the one-touch operation of the lever 30 makes it possible to easily and quickly carry out the threading operation to the portion of the intermediate thread path 15, and by operating the lever 30, each thread take-up member 2
Since the arm portions 25a of No. 5 can be put into a posture in which the threading can be performed all at once, it is particularly effective when, for example, threading is first performed on the six needle bars 5.

During operation of the sewing machine, the arm portion 25a of the thread take-up member 25 is actuated for each reciprocating movement of the selected needle bar 5, and reciprocates between the positions indicated by the imaginary line and the solid line in FIG. 3 (b). To do. At this time, the balance 7 and the arm portion 25a
The bending portion of the upper thread a existing in the above question is only the left thread guide body 20 forming the upper thread turning portion 18, and the bending resistance acting on the upper thread a only acts at this portion. Not too much.
Therefore, the arm portion 25a of the thread take-up member 25 reacts sensitively to the change in the tension of the upper thread a that occurs downstream of the thread take-up 7. Therefore, as in the case of the conventional device, the occurrence of yarn breakage due to the slow reaction of the yarn catching member is effectively avoided.

In this embodiment, the lever 30 is operated to change the posture of the arm portion 25a in the free state as shown in FIG.
The stroke of the arm portion 25a can be changed all at once by appropriately changing as shown by the one-dot chain line and the two-dot chain line in (a), and one-touch operation can be performed according to the thread type, the sewing tone, and the desired stitch finish. It is possible to deal with. Here, when the lever 30 is rotated, since the clutch portions 32 and 34 are elastically meshed with each other by the compression coil spring 31, the support shaft 23 is positively moved at the meshing pitch to rotate the lever 30. It is easy to operate, and it also serves as a guide for the rotation angle, providing a rich sense of operation. However, such a mechanism is not an indispensable requirement, and may be a support structure in which a predetermined resistance is applied when the support shaft 23 is rotated.

Further, as described above, since the strength of the spring in each thread take-up member 25 can be adjusted individually for each thread take-up unit 21, different thread take-up adjustments can be made for each needle bar 5 and are used. Appropriate measures can be taken according to the type of yarn. Further, in each thread take-up unit 21, an electrode is provided on the stopper portion 26d of the arm section 25a of the thread take-up member 25, and a contact state with the arm section 25a is electrically detected to detect a thread breakage state of the upper thread a or the like. You may do it. Further, a pointer and a scale indicating the rotation angle of the lever 30 in the thread take-up assembly 22 may be provided so that the rotation angle of the lever 30, that is, the support shaft 23 can be confirmed at a glance.

[0020]

As described above, according to the multi-needle embroidery sewing machine of the present invention, since the thread take-up member is provided in the upper thread turning portion upstream of the thread take-up machine, the thread take-up member is provided between the thread take-up member and the thread take-up member. There is only one bend in the thread. Therefore, since the bending resistance acting on the upper thread can be reduced, the fluctuation of the tension of the upper thread downstream of the balance can be directly transmitted to the thread removing member, and the original function of the thread removing member can be sufficiently exhibited. Further, during threading, the postures of the thread take-up members can be changed all at once, so that the threading operation can be carried out easily and quickly, which is a beneficial effect.

[Brief description of drawings]

FIG. 1 is a front view showing a sewing machine head of a multi-head multi-needle embroidery sewing machine according to a preferred embodiment of the present invention.

FIG. 2 is a right side view of the sewing machine head shown in FIG.

FIG. 3 is a side view showing an arrangement relationship between a middle thread path and a thread take-up assembly according to a preferred embodiment, and FIG. 3 (a) shows that the arm portion of each thread take-up member is returned to the normal posture by returning the lever. FIG. 3 (b) shows a state in which the arm is aligned with the thread hole of the thread guide body by pulling the lever toward you.

4 is a partially cutaway perspective view of the intermediate thread and thread take-up assembly according to FIG. 3. FIG.

5 is a front view of the intermediate thread and thread take-up assembly according to FIG. 4; FIG.

FIG. 6 is a partially cutaway enlarged cross-sectional view of the thread take-up assembly in a state where a thread take-up member, a stopper member and a spring strength adjusting member are assembled.

FIG. 7 is an exploded perspective view of a thread take-up unit according to a preferred embodiment.

8 is a vertical cross-sectional view of the thread take-up unit shown in FIG.

FIG. 9 is a partially cutaway front view showing a threading state through a middle thread portion according to a preferred embodiment.

FIG. 10 is a partially cutaway front view showing a working state for threading the intermediate thread portion according to the preferred embodiment.

FIG. 11 is a perspective view of a clutch mechanism incorporated in the thread take-up assembly.

[Explanation of symbols]

1 sewing machine head 5 needle bars 7 Balance 15 Nakaito 15d slit 15e Support plate 18 Upper thread turning section 20 thread guide 20a thread hole 22 Thread take-up assembly 23 Support shaft 25 Thread removing member 26 Stopper member 27 Spring strength adjustment member a thread

Claims (3)

[Claims] 1. A multi-needle embroidery sewing machine having at least one sewing machine head (1) having a plurality of needle bars (5) and a plurality of balances (7) corresponding to the needle bars (5).
The upper thread turning portions (18) are respectively arranged upstream of (7), and the thread take-up members (25) are correspondingly arranged at the respective upper thread turning portions (18), so that the thread take-up members (25) are collectively provided. A multi-needle embroidery sewing machine characterized in that the posture can be changed. 2. The needle thread turning portion (18) is composed of two thread guides (20, 20) each having a thread hole (20a) formed therein, and these two thread guides (20, 20) are formed. 2. The multi-needle embroidery sewing machine according to claim 1, wherein the gap of 20) straddles the slit (15d) formed in the middle thread path (15) correspondingly. 3. A thread take-up assembly (22) is disposed below the intermediate thread path (15), and the thread take-up assembly (22) is rotatable and axially disposed between support plates (15e, 15e) arranged opposite to each other. A support shaft (23) slidably supported on the support shaft (23) and a thread take-up unit (21) provided on the support shaft (23) as many as the balance (7). A thread removing member (25) made of a spring, a stopper member (26), and a spring strength adjusting member.
The multi-needle embroidery sewing machine according to claim 2, further comprising (27).