JPH101860A - Yarn deliverer of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and efficiently perform setting and supplying operations, etc., of yarns at a sewing operation side by providing a yarn stand mounted in rear of a needle head in a state capable of switching and transferring to the sewing operation side in front of the needle head. SOLUTION: This yarn deliverer is mounted on a sewing machine supporting a needle head 2 having a sewing needle 20 above a table 13 for setting a work W and having a yarn stand for supplying a yarn to a rear side of the needle head 2, and the yarn stand is made to be capable of switching and transferring from a rear waiting position Z to a side of a yarn setting position X in front of the needle head 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread feeding device for sewing machines such as embroidery machines and industrial sewing machines provided with a thread stand on which a winding thread is placed.

[0002]

2. Description of the Related Art Conventionally, an embroidery machine which is a sewing machine as described above is provided with a thread stand on the back of a needle head installed above a table, and a sewing machine provided with a thread stand set on the thread stand. The thread feeding device is configured to feed out and supply the thread to the sewing needle, and when the thread of the wound thread is fed out and lost and a new winding thread is replenished, or when it is desired to replace the wound thread with another one, etc. Then, the worker moves from the selfish side to the side of the thread stand installed behind the machine to perform the setting operation of the winding thread.

[0003]

However, in the embroidery machine having the above-mentioned conventional construction, when a thread setting operation or the like is performed, it is necessary for an operator to move away from the work side and move behind the machine body during the embroidery operation. Therefore, there are drawbacks in that the sewing operation and the monitoring thereof are sparse, and complicated labor is required. Also, when you want to check the remaining amount of the wound yarn during the embroidery operation, or to check the condition of the yarn guidance and its troubles, the work side is blocked by the needle head, the mounting frame, the yarn adjustment device, etc. There are drawbacks such as difficulty in visual recognition and difficulty in immediately correcting and coping with yarn modulation and feeding trouble. They also had to shut down the embroidery machine to take care of these problems and needed assistance.

[0004] When installing such an embroidery machine indoors, a passage for setting and winding a winding thread at the rear of the machine, and a sufficient space for an operator to work with a margin. Therefore, there is a problem that the installation space is largely occupied. In recent years, an embroidery machine has been proposed in which a thread feeding device is configured above a mounting frame of a needle head. However, the thread feeding device of this embroidery machine can visually check and set a winding thread from the front. However, since the yarn feeding device is located at a high position in the center of the machine body, there are inconveniences such as the above-mentioned work being difficult to perform.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, a thread feeding device for a sewing machine according to the present invention comprises:
In the sewing machine, a needle head 2 having a sewing needle 20 is supported above a table 13 on which a work W is set, and a thread stand 3 for supplying a thread S to a rear side of the needle head 2 is provided. The platform 3 is characterized in that it can be switched from the rear evacuation position Z to the yarn setting position X in front of the needle head 2.

Secondly, when the yarn stand 3 is switched from the retreat position Z to the yarn setting position X, the yarn stand 3 is moved downward from above.

Third, the sewing needle 20 of the needle head 2 and the thread stand 3
The thread S stretched between the thread guide 6 and the flexible thread guide 6
And a plurality of guide pieces 6G for guiding the thread are formed on the inner peripheral surface of the thread guide 6.

Fourth, the sewing needle 2 is provided on the side of the thread stand 3 of the thread guide 6.
The thread holding means 6H for detachably fixing the end of the thread S inserted into the thread 0 is provided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. 1 and 2, reference numeral 1 denotes an embroidery machine of a needle head multi-head type according to an embodiment of a sewing machine.
The embroidery machine 1 forms a body frame 1a by connecting left and right support legs 10 with upper and lower horizontal frames 11, 12, and embroiders a work W such as a cloth material to be embroidered on an embroidery work side on the front side. The table 13 to be set is placed horizontally in the front-rear direction, and nine needle heads 2 having a large number of sewing needles 20 are installed on the horizontal frame 11 above the table 13 at predetermined intervals. The needle head 2 in the illustrated example shows an embroidery head provided with nine sewing needles 20, and each needle 20 is appropriately threaded and guided by a thread adjusting device 4 using a conventional means. .

Above the table 13 and above and behind the needle heads 2, a winding thread S 1 formed by winding a sewing or embroidering thread S around a core tube is supported upright by the number of needles of each needle head 2. The thread stand 3 is configured in a thread feeding device 5 described later, and the thread stand 3 is provided via a switching mechanism 7 so as to be switchable between front and rear and up and down. A thread adjusting device 4 is mounted above the horizontal frame 11 between the thread stand 3 and the needle head 2 so as to correspond to each needle head 2.
Reference numeral 1b denotes a control box provided on the right side of the embroidery machine 1 for operating the embroidery machine 1.

Next, the structure of the yarn feeding device 5 will be described with reference to FIGS. The yarn feeding device 5 includes a yarn supporting device 3A having a plurality of yarn stands 3 to be described later, and a predetermined number of yarn guides 6 for feeding and guiding the yarn S from the yarn supporting device 3A.
And a yarn guide device 6A having a support frame 7 detachably provided on both sides of the body frame 1a.
Between the F and 7F, the mounting frame 70 is slidably mounted on a horizontally mounted mounting frame 70, and the mounting frames 71 on both sides of the mounting frame 70 are supported by a slide portion 7S formed to be inclined forward and downward at the upper end of the support frame 7F. In this state, it is possible to integrally move up and down and up and down based on a switching operation of a switching mechanism 7 described later.

The switching mechanism 7 is provided with a drive motor 7M having a screw rod 7N in the illustrated example on a mounting table 73 extending rearward from the support frame 7F so that the screw rod 7N is parallel to the slide portion 7S. At the same time, the front end of the screw rod 7N is rotatably supported on the support frame 7F via the bearing 73a, and the female screw 7 provided on the rear end of the mounting frame 71 is provided.
1a is screwed into an intermediate portion of the screw rod 7N. Reference numeral 50 denotes an operation box for freely performing operations such as forward / reverse rotation and operation stop of the drive motor 7M in manual and automatic modes. This operation allows the position of the thread stand 3 of the yarn feeding device 5 to be changed by the drive motor 7M. In the case of normal rotation, it is moved downward from the retreat position Z shown by a solid line to the front side,
The switching operation can be performed to the yarn setting position X indicated by the dotted line.

Next, referring to FIGS. 3 to 6, the structure of the yarn supporting device 3A and the yarn guiding device 6A of the yarn feeding device 5 will be described. The yarn supporting device 3A includes a plurality of support arms 76 protruding forward from the mounting member 70a of the mounting frame 70.
The thread stand 3 is detachably mounted. The thread stand 3 in this embodiment combines the thread stand 30 corresponding to each needle head 2 so as to form a thread stand group having the number of needles set up by the number of needles, and the same number of thread stands 30 for each appropriate number of needle heads 2. In a state where a plurality of the thread stand groups are set up on one thread stand 3, three thread stands 3 are provided.
It is divided and formed.

As shown in FIGS. 3 and 4, the thread stand 3 in this embodiment has a U-shape in a side view on the left and right sides of a plate-like thread stand 32 on which the thread stand 30 is erected. Handle 33
The handle 33 is provided so that the height of the handle 33 is higher than the height of the winding thread S <b> 1 mounted on the thread stand 30 in a standing shape. The front and rear ends of the thread stand frame 32 are bent rearward, and on both lower surfaces thereof, engagement portions 35 are formed so as to engage with the installation portions 77 of the support arms 76, and the engagement portions 35 are provided. The thread stand 3 is configured to engage with the head of the handle 33 when the thread stand 3 is overlapped in a shelf shape. Thus, if the number of the yarn stand 3 set in the yarn support device 3A is prepared in advance, the yarn stand S3 necessary for the next process is provided on the yarn stand 3.
Is set in advance so that the yarn replenishing operation can be performed efficiently.

The support arm 76 has a thread stand 3 on its upper surface.
Is provided with an installation portion 77 having two protruding support portions 77a that mesh with the engagement portion 35. The installation portion 77 is formed of an elastic member made of rubber, plastic, or the like, so that the adjacent thread stand is formed. The table 3 can be easily and detachably mounted individually from above. Thereby, in a state where the thread stand 3 is placed on the support arm 76, it is possible to favorably support the thread stand 3 without displacement due to vibration of the embroidery machine 1 or the like, and the winding thread S1 does not violently vibrate. it can. In this embodiment, the configuration of the thread stand 3 is shown as being detachable from the machine body. However, the thread stand may be fixed to the machine body as in a conventional embroidery machine.

The yarn guide device 6A has a structure in which a base of the yarn guide 6 formed of a flexible bellows-shaped tubular tube is appropriately attached to a portal-type horizontal frame 11 above the yarn adjusting device 4. The supporting columns 78a, 78a, which are mounted on the opposite sides of the mounting frame 70 above the opposing thread stand 3, with the other end of the mounting frame 70 curved in a state where the middle is curved upward.
Is mounted and fixed to the guide frame 78 placed on the guide frame 78 with the fixture 60. Thus, when the yarn feeding device 5 moves up and down to change the position with the yarn adjusting device 4, the yarn S is inserted into the yarn guide 6 and is stretched between the yarn feeding device 5 and the yarn adjusting device 4. Since the distance between the yarns is not substantially changed, the guidance is favorably guided in a state in which the yarns are not loosened or entangled with other yarns S.

As shown in FIG. 5, the thread guide 6 is formed by continuously forming a large number of guide pieces 6G formed in a smooth protruding shape on the inner surface of the cylindrical tube, and the sewing pieces 20G of the needle head 2 are formed by the guide pieces 6G. The thread S, which is stretched between the thread stand 3 and the thread stand 3, is guided so as to make point contact, so that the guiding can be smoothly guided with the feeding resistance as small as possible. The initial threading to the thread guide 6 is performed by the winding thread S1.
In a state in which the unthreaded yarn S is inserted into the inlet 6p of the yarn guide 6, it may be inserted through the yarn passing tool 6W toward the outlet 6t.

That is, an air gun can be used as the thread passing tool 6W in this embodiment, and the yarn S is placed on the air flow by blowing air from the inlet 6p of the thread guide 6 into the thread guide 6. The thread can be easily and accurately threaded through the guide 6. The threading means may be performed by using a threading tool such as a wire. In this case, the thread guide 6 can be point-contacted without necessarily forming the thread guide 6 in a bellows-like cylindrical tube. A configuration may be such that a plurality of rings that guide the user are installed.

On the side of the thread stand 3 of the thread guide 6, that is, on the side of the entrance 6p, a thread holding means 6H for removably securing the end of the thread S inserted through the sewing needle 20 of the needle head 2. When the sewing needle 20 is in a resting state, the end of the thread S inserted through the sewing needle 20 is detachably fastened at the entrance 6p side while maintaining the posture of being inserted through the thread guide 6. I can do it. Thus, when the sewing needle 20 is to be used again, the thread S inserted through the sewing needle 20 is removed from the thread holding means 6H, and the thread S is used as a thread, and the next thread S end By performing the pulling operation so that the thread guide 6 and the needle hole of the sewing needle 20 are inserted in a state in which the thread is tied, the initial threading as described above is not required and can be easily performed.

The thread holding means 6H shown in FIG. 5 has a magnet plate 61 attached to a guide frame 78 and a knob so that a plurality of threads S corresponding to the respective needle heads 2 can be freely locked. An attachment plate 62 made of a metal plate having the following is provided so as to be magnetically attached to the magnet plate 61, and the yarn S is held between the two. Further, the yarn holding means 6H shown in FIG. 4C is provided with a locking member having an appropriate structure for detachably fastening the yarn S at each entrance 6p of each yarn guide 6, and for example, a yarn A hook-shaped locking member 63 may be provided by means such as making a cut in the guide 6, and the end of the thread S may be pinched and locked to this locking member 63.

At this time, the yarn guide device 6A is connected to the support 78a.
In such a manner, the thread changing operation and the yarn holding operation can be easily performed by rotatably providing the rotary shaft. That is, the yarn guide device 6A in the illustrated example is configured such that the rear portion of the guide frame 78 is rotatably mounted on a rotation shaft 77a provided at the rear portion of the support post 78a, so that the By rotating the front side upward with the rotation shaft 78a as a fulcrum, the upper part of the thread stand 3 can be largely released, and the above operation can be performed simply and efficiently. The thread guide 6 is attached to the needle head 2 so as to be rotatable and displaceable as shown in FIGS.

The operation by the embroidery machine 1 provided with the yarn feeding device 5 configured as described above is performed by first operating the operation box 50 to switch the yarn feeding device 5 to the yarn setting position X, and then performing a predetermined operation. The winding thread S1...
The thread stand 3 set in the position is placed on the support arm 76 with its handle 33 and positioned and supported, and the thread S of each winding thread S1 is inserted into the thread guide 6 from the inlet 6p by the threading means described above. After being fed to the insertion outlet 6t, the yarn feeding device 5
Is moved to the intermediate work monitoring position or the evacuation position Z to open the upper part of the table 13 on the front side of the needle head 2 and to thread the yarn adjusting device 4 in the same procedure as the conventional embroidery machine 1. The thread is passed through the sewing needle 20 via the needle head 2, and then, in a working state in which the work W is set on the table 13, the control box 1 b is operated to operate the sewing needle 2.
Then, the sewing operation such as embroidery is performed by operating the table 0 and the table 13.

At this time, the worker does not move to the rear of the embroidery machine 1 when setting the winding thread S1 as in a conventional embroidery machine, but instead places the thread stand 3 on the sewing work side and the needle head 2 The front side is set at a low thread setting position X close to the table 13 so that the work can be performed in a comfortable posture.
A simple and efficient replenishing operation for individually replacing 1 is performed. Then, after the above operation is completed, the yarn feeding device 5 is moved to the retreat position Z, so that the yarn support device 3A and the yarn guide device 6A are integrally integrated with the table 1.
3, the table 13 can be opened and the needle head 2 can be exposed, so that the yarn S fed from the yarn guide 6 can be adjusted without the yarn feeding device 5 being in the way. The work of threading the device 4 and the needle head 2 and the threading of the sewing needle 20 and the like can be easily performed, and the work of setting the work W on the table 13 and the inspection and repair work can be performed freely.

The thread feeding device 5 stops the thread stand 3 at a work monitoring position at an arbitrary intermediate height, whereby the thread stand 3 is set on the sewing state of the work W and the thread stand 30 at this position. Advantageously, it is possible to satisfactorily monitor the feeding state of the winding thread S1 and the like at the same time, to accurately detect sewing and thread feeding troubles, etc., and to quickly carry out countermeasures. Further, in this state, since the replenishing operation of the thread S can be easily performed while monitoring the sewing operation, it is possible to prevent troubles such as missing the yarn replenishing time.

Next, a second embodiment of the present invention will be described with reference to FIG. The yarn feeding device 5 includes a mounting frame 70.
7U is a hydraulic cylinder for reciprocatingly operating the yarn feeding device 5 between a retreat position Z and a yarn setting position X through a sliding portion 7S of a switching mechanism 7 in a forward horizontal direction. The cylinder side is attached to a support frame 7F provided on the side of the horizontal frame 11, and the piston side is connected to the yarn feeding device 5.

Next, a third embodiment of the present invention will be described with reference to FIG. The yarn feeding device 5 is provided with a parallel link-like support arm 7 of a switching mechanism 7 provided on the side of the horizontal frame 11.
A is supported at a retreat position Z above and behind the horizontal frame 11 via A. The switching mechanism 7 causes the worm and the worm gear provided at the base of the support arm 7A to rotate the drive motor 7M in the normal direction, thereby moving the yarn feeding device 5 upward from the retreat position Z as indicated by the dotted line, and And can be switched to the thread setting position X in front of the needle head 2 and close to the table 13. Further, the yarn feeding device 5 can return to the original retreat position Z through the same locus by the reverse rotation of the drive motor 7M. Note that the retreat position Z of the yarn feeding device 5 may be above the horizontal frame 11. When the exit 6t side of the thread guide 6 is rotatably attached to the horizontal frame (body) 11 via an attachment portion 65, the follow-up of the thread guide 6 accompanying the switching movement of the thread feeding device 5 is performed. Satisfactorily without any excessive refracting power.

Next, a fourth embodiment of the present invention will be described with reference to FIG. In this yarn feeding device 5, a switching mechanism 7 is attached to a rail 7R laid on the ceiling T, and the switching mechanism 7
Is configured to move up and down the yarn feeding device 5 via the elevating mechanism 50 and to move back and forth along the rail 7R via the traveling mechanism 51. According to this example, the yarn feeding device 5 supported by the switching mechanism 7 can set the retreat position Z to any position above and behind the horizontal frame 11 and set the yarn setting position X to the front of the needle head 2. And the sewing height and the thread changing operation can be performed favorably.

The yarn feeding device 5 having the above-described switching mechanism 7 can be retrofitted to a conventional embroidery machine of various forms without any major modification by a simple and inexpensive structure. In addition to this, there is a feature that transmission of vibration on the embroidery machine 1 side to the yarn feeding device 5 can be suppressed.

[0029]

According to the present invention, the following technical effects can be obtained by the above-described configuration. According to the invention of claim 1,
Since the thread stand installed behind the needle head is provided so as to be switchable to the sewing operation side in front of the needle head, it is possible to easily and efficiently perform thread mounting, replenishment operation, and the like on the sewing operation side. After the above operation is completed, the thread stand can be easily switched from the thread setting position to the retracted position, so that the thread hooking operation, the work setting and the sewing operation, etc. can be performed well and the monitoring thereof can be performed. Can be done properly.

According to the second aspect of the present invention, when the yarn stand is switched from the retracted position in the front-rear direction to the yarn setting position,
Since it can be provided at a low position close to the table, replenishing of the winding thread and maintenance work can be easily performed in an easy posture.

According to the third aspect of the present invention, the yarn fed from the winding yarn is guided by being inserted into a flexible yarn guide provided with a plurality of guide pieces, so that the yarn is moved from the yarn stand to the needle head. Good guidance can be provided. In addition, since the yarn guide is formed in a cylindrical shape, there is an advantage in that, when the yarn of the wound yarn is inserted into the inlet, the yarn guide can be easily inserted toward the outlet using a yarn passing tool.

According to the fourth aspect of the present invention, the thread end inserted into the sewing needle can be easily fixed to the thread holding means at the entrance of the thread guide on the thread stand side, so that the sewing needle is brought into a rest state. At one time, the posture in which the thread is inserted into the thread guide can be maintained, and when the sewing needle is to be used again, the thread can be used as a thread and the next thread can be easily inserted into the needle hole of the thread guide and the sewing needle. Can be inserted.

[Brief description of the drawings]

FIG. 1 is a front view of an embroidery machine according to the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a side view showing a main part of the feeding device.

FIG. 4 is a front view showing a setting state of the thread stand;

FIG. 5 is a sectional view of a yarn guide.

FIG. 6 is a perspective view showing a main part of a thread guide device to be attached.

FIG. 7 is a side view showing a second embodiment of the present invention.

FIG. 8 is a side view showing a third embodiment of the present invention.

FIG. 9 is a side view showing a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Embroidery machine 2 Needle head 3 Thread stand 3A Thread support device 4 Thread adjustment device 5 Thread feeding device 6 Thread guide 6A Thread guide device 6G Guide piece 6H Thread holding means 7 Switching mechanism 7M Drive motor 7S Slide section 11 Horizontal frame 13 Table Reference Signs List 20 sewing needle 30 thread stand 33 handle 70 mounting frame S thread S1 winding thread W work X thread setting position Z retreat position

Claims (4)

[Claims] A table (1) for setting a work (W).
A sewing machine having a thread stand (3) for supplying a thread (S) to the rear side of the needle head (2) while supporting a needle head (2) having a sewing needle (20) above the needle head (3). At
A thread feeding device for a sewing machine, wherein the thread stand (3) is switchably movable from a rear retracted position (Z) to a thread setting position (X) in front of the needle head (2). 2. The thread feeding device for a sewing machine according to claim 1, wherein when the thread stand (3) is switched from the retreat position (Z) to the thread setting position (X), the thread stand is moved downward from above. 3. A thread (S) stretched between a sewing needle (20) of a needle head (2) and a thread stand (3) is inserted through a flexible thread guide (6). 3. The thread feeding device for a sewing machine according to claim 1, wherein a plurality of guide pieces (6G) for guiding the thread are formed on an inner peripheral surface of the thread guide (6). 4. A thread holding means (6H) for detachably securing an end of a thread (S) inserted through a sewing needle (20) to a thread stand (3) side of a thread guide (6). 4. The thread feeding device for a sewing machine according to claim 1, wherein the thread feeding device is provided.