JP3111000B2 - Thread feeder of sewing machine for sewing - Google Patents

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, has a thread stand provided on the back of a needle head installed above a table, and a winding thread set on the thread stand. The yarn feeding device is configured to feed and supply the thread from the to the sewing needle, and when the thread of the winding thread is fed out and runs out, it is necessary to replenish a new winding thread or to replace the winding thread with another one In some cases, the worker moves from the work side to the side of the thread stand installed behind the machine to perform the winding thread setting operation.

[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. When installing such an embroidery machine indoors, it is necessary to provide a sufficient space for the operator to work with sufficient space at the rear of the machine for setting and winding the winding thread. Because there is
There are problems such as occupying a large installation space.

[0004]

To achieve the above object, a thread feeding device for a sewing machine according to the present invention comprises a work W
In a sewing machine, a needle head 2 having a sewing needle 20 is supported above a table 13 for setting a thread, and a thread stand 3 for supplying a thread S to the needle head 2 is provided. The thread stand 3 is provided so as to be switchable between a thread setting position X and a retreat position Z.

The yarn stand 3 is characterized in that it can be stopped at a work monitoring position Y between a yarn setting position X and a retreat position Z.

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.

The needle head 2 is located 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 through the sewing needle 20 is provided.

[0008]

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 comprises a left and right support legs 10 connected by upper and lower horizontal frames 11 and 12 to form a body frame 1a. The table 13 to be set is placed laterally toward the front, and 12 needle heads 2 having a large number of sewing needles 20 are provided at predetermined intervals on the horizontal frame 11 above the table 13. 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. .

[0009] Above the table 13 and in front of the needle head 2 group, winding yarns S1 obtained by winding sewing or embroidering yarns S around a core tube are supported upright by the number of needles of each needle head 2. The thread stand 3 is configured as a thread feeding device 5 described later, and the thread stand 3 is provided so as to be capable of vertically moving up and down via its lifting mechanism 5a. The thread stand 3 and the needle head 2
The thread adjusting device 4 is mounted above the horizontal frame 11 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.
, Which are attached to attachment frames 70 and 71 provided between the lifting frames 7 and 7 of the lifting mechanism 5a provided on both sides of the body, and are integrally formed together. It is configured to be able to move up and down. The elevating frame 7 is provided with an appropriate number of guide rollers 72... At the top and bottom and back and forth thereof, and is slidably fitted into the guide groove 50 of the elevating mechanism 5a. Both ends of the lifting chain 73 are fixed. Reference numeral 75 denotes a rope fixed to the upper end of the elevating frame 7. The rope 75 is connected to a winding attachment device 7 b attached to the back of the embroidery machine 1 to assist the upward movement of the yarn feeding device 5. I am trying to do it.

As shown in FIG. 2, the elevating mechanism 5a has front and rear support columns 51, 52 framed in a rectangular shape by upper and lower horizontal rods 53, 54, and is detachably attached to the outer sides of both side support legs 10 of the body. The guide groove 5 for slidingly guiding the guide rollers 72 of the lift frame 7 with the support column 51 and the guide plate 55.
0 is formed in the vertical direction. And the horizontal rods 53, 54
Sprockets 53a and 54a are disposed on the upper and lower portions of the guide groove 50, and the above-mentioned lifting chain 73 is wound around the sprockets 53a and 54a.
4a is connected to a drive shaft 56
And the drive shaft 56 is driven by a drive motor M so as to be able to rotate forward and reverse.

Reference numeral 57 denotes an operation box for freely performing operations such as forward / reverse rotation and operation stop of the drive motor M in manual and automatic modes. This operation allows the position of the yarn stand 3 of the yarn feeding device 5 to be adjusted to the maximum. Thread set position X indicated by solid line lowered
The operation can be stopped at any position of the evacuation position Z, which is the highest position shown by the dotted line, and the intermediate work monitoring position Y. A stopper 59 is provided in the guide groove 50 so as to protrude and retract with the elevating operation of the yarn feeding device 5.
Is provided, and the yarn feeding device 5 is provided by the stopper 59.
Can be prevented from unexpectedly lowering at each operation stop position.

Next, referring to FIGS. 3 to 5, the yarn supporting device 3A
The configuration of the yarn feeding device 5 including the yarn guide device 6A and the like will be described. In the yarn supporting device 3A, the yarn stand 3 is detachably mounted on a plurality of support arms 76 projecting forward from the lower part of the lifting frame 7. 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 30a standing up to the number of needles, and the same number of thread stands 30 for every appropriate number of needle heads 2. Are set up on one thread stand 3 (in the illustrated example, three groups of thread stand groups 30a,... Corresponding to the three needle heads 2 are provided). In this state, it is divided into four thread stands 3.

As shown in FIGS. 5 and 6, 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 to the rear side, and the mounting portions 7 of the support arms 76 described later are provided on both lower surfaces thereof.
7 is provided, and the engaging portion 35 is provided with the handle 33 when the thread stand 3 is overlapped in a shelf shape as shown in FIG. Is configured to be positioned so as to be engageable. Therefore, by preparing more than the number of the yarn stand 3 set in the yarn supporting device 3A, the winding thread S necessary for the next process is provided on the yarn stand 3.
There is an advantage that the set of 1 is performed in advance and the operation of replenishing the yarn can be performed efficiently.

On the other hand, as shown in FIG. 5, the support arm 76 has on its upper surface a support portion 77 which meshes with the engagement portion 35 of the thread stand 3.
The installation section 77 is provided with two protruding sections a.
Numeral 7 is formed of an elastic member made of rubber or a plastic material, so that the adjacent thread stands 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.

The yarn guide device 6A is configured such that a base of the yarn guide 6 formed by a flexible bellows-shaped tubular tube is attached to a mounting rod 40 provided above the yarn adjusting device 4 by a mounting member 60. The other end is lifted up and down by the lifting frame 7 above the opposing thread stand 3 in a state where it is attached and fixed and its middle is curved upward.
A mounting rod 71b provided laterally on the supporting arm 71a.
0 is attached and fixed. Thereby, 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, the yarn feeding device 5
Since the distance between the yarns stretched between the yarn and the yarn adjusting device 4 is not substantially changed, the guide is properly guided in a state in which the yarn is not loosened or entangled with another yarn S.

As shown in FIG. 4, 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 tubular 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. 4A affixes the magnet plate 61 to the mounting frame 71b so that a plurality of threads S corresponding to each needle head 2 can be freely locked. At the same time, an attachment plate 62 made of a metal plate having a knob 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.

The operation of the embroidery machine 1 having the yarn feeding device 5 configured as described above is performed by first operating the operation box 57 and lowering the yarn feeding device 5 to the yarn setting position X. The thread stand 3 on which the winding thread S1 is set on the thread stand 30 is held by the support arm 7 by holding the handle 33.
6 and is positioned and supported, and the thread S of each winding thread S1 is passed through the thread guide 6 from the entrance 6p by the threading means described above.
Then, the yarn feeding device 5 is raised to the operation monitoring position Y or the retreat position Z to open the upper part of the table 13 on the front side of the needle head 2 so that the conventional embroidery machine 1 In a similar procedure, the thread is threaded on the thread adjusting device 4, the threading is performed on the sewing needle 20 via the needle head 2, and the work box W is set on the table 13. 20 and the table 13 are operated to perform sewing work such as embroidery.

At this time, the worker does not move to the rear of the embroidery machine 1 when setting the winding thread S1 like a conventional embroidery machine, but instead places the thread stand 3 on the sewing work side and the needle head 2 Place it in a low position close to the table 13 on the front,
The work can be performed in a comfortable posture, and the replenishment work for individually replacing the winding yarn S1 can be performed easily and efficiently. Then, after the above operation is completed, the yarn feeding device 5 is raised, whereby the yarn support device 3A and the yarn guide device 6A are integrally separated from the table 13 and the table 13 is moved upward. Since the needle S can be released and the needle head 2 can be exposed, the thread S fed from the thread guide 6 without hindering the thread feeding device 5 can be threaded onto the thread adjusting device 4 and the needle head 2 or the sewing needle 20 can be used. It is possible to easily perform the operation of threading through the table 13 and to freely perform the work of setting the work W on the table 13 and the inspection and repair work.

Further, since the thread feeding device 5 can stop and maintain the thread stand 3 at the work monitoring position Y at an arbitrary intermediate height, the sewing state of the workpiece W and the thread stand 30 in this position can be maintained.
Advantageously, it is possible to simultaneously and satisfactorily monitor the reeling status of the winding thread S1 set in the sewing machine, and to accurately detect sewing and thread reeling-out troubles, and to quickly perform countermeasures. There is. 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.

The feeding device 5 has an elevating mechanism 5a via the elevating frames 7, 7 as described above, and a support frame extending upward from the embroidery machine 1 in a forward and upward direction. With this configuration, it can be easily and inexpensively retrofitted to a conventional embroidery machine without requiring significant modification. In addition, the feeding device 5 does not necessarily need to be integrally installed on the embroidery machine 1 itself, but may be provided with the lifting mechanism 5a or the hanging member 73 as shown by a dotted line in FIG. It may be configured by mounting via another mounting frame 1T. In this case, it is possible to omit members such as columns of the elevating mechanism, and also to a conventional embroidery machine as described above. The embroidery machine 1 can be easily retrofitted, and the transmission of vibration of the embroidery machine 1 to the yarn feeding device 5 can be suppressed.

[0025]

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 is provided so as to be able to move up and down on the same sewing operation side as the working section side of the needle head, it is possible to easily and efficiently perform thread mounting and replenishment operations on the sewing operation side. After the above operation is completed, the thread stand can be switched from the thread setting position to the retracted position, so that the thread hooking operation, the work setting and the sewing operation can be performed satisfactorily, and the monitoring thereof can be performed well. It can be carried out.

The thread stand can be stopped and maintained at an operation monitoring position of an arbitrary height between the thread setting position and the retreat position, so that the sewing state of the workpiece and the winding state of the winding thread can be simultaneously and satisfactorily monitored. In addition to the above, it is possible to quickly perform a trouble-shooting operation such as trouble prevention and yarn replenishment.

By guiding the yarn fed from the wound yarn through a flexible yarn guide provided with a plurality of guide pieces, the yarn of which the feeding height is changed 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 second aspect of the present invention, the sewing needle is stopped by providing a thread holding means for removably securing the thread end inserted into the sewing needle to the entrance of the thread guide on the thread stand. In this state, 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 is used as the thread and the next thread is inserted into the thread guide and the needle hole of the sewing needle. Can be easily inserted.

[Brief description of the drawings]

FIG. 1 is a front view of an embroidery machine provided with a feeding device 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. 4A is a perspective view showing a main part of a yarn guide device.
(B) is a sectional view of the yarn guide. (C) is sectional drawing which shows another embodiment of a thread holding means.

FIG. 5A is a front view showing a setting state of a thread stand.
(B) is a side view of FIG.

FIG. 6 is a perspective view showing a state where the thread stands are stacked in a shelf shape.

FIG. 7 is a plan view of the thread stand.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Embroidery machine 2 Needle head 3 Thread stand 3A Thread support device 4 Thread adjusting device 5 Thread feeding device 5a Elevating mechanism 6 Thread guide 6A Thread guide device 7 Elevating frame 13 Table 20 Sewing needle 30 Thread bar 33 Handle 76 Support arm S Thread W Work X Yarn setting position Y Work monitoring position Z Evacuation position

Claims (2)

(57) [Claims] A table (1) for setting a work (W).
To support the needle head (2) having a sewing needle (20) above the 3), needle head (2) to the yarn (S) yarn stand base for supplying (3) above Symbol sewing sewing machine provided with Thread stand (3)
Is provided on the same front side as the working section of the needle head (2), and the thread stand (3) is provided so as to be switchable between a thread setting position (X) and a retreat position (Z). ) Thread setting position
(X) and the work monitoring position (Y) between the retreat position (Z)
In a sewing machine that can be stopped, the needle head
It is stretched between the sewing needle (20) of (2) and the thread stand (3).
Thread (S) is inserted into a flexible thread guide (6).
The yarn guide (6)
A thread feeding device for a sewing machine having a plurality of guide pieces (6G) protrudingly formed . 2. A needle is attached to the yarn stand (3) side of the yarn guide (6).
Of the thread (S) inserted through the sewing needle (20) of the pad (2).
The thread feeding device for a sewing machine according to claim 1, further comprising a thread holding means (6H) for removably securing an end portion .