JPH0159379B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thread supply device for an embroidery sewing machine that can hold a large number of colored threads and can be easily replaced and used.

[Conventional technology and its problems]

In embroidery sewing machines, a large number of colored threads are used interchangeably. For this purpose, the number of colored threads to be used is arranged at or above the sewing machine head so that a predetermined number of colored threads can be used. However, industrial embroidery machines have 10 or more sewing machine heads arranged in parallel on a single machine, allowing many of the same patterns to be embroidered at the same time, improving production efficiency. Therefore, the distance between adjacent sewing machine heads is narrow, and there is a limit to how many colored threads can be held using this narrow space. When embroidering with more colored threads than can be held in a space, it is necessary to embroider with the colored threads held in the space, remove this colored thread, replace it with the next new colored thread, and embroider again. . In general, bobbins of the same or more colors used for one embroidery pattern are directly inserted into and supported by a large number of spindles provided at the upper part of the sewing machine head. When one pattern of embroidery is completed, the next pattern is started, but at this time, it is necessary to change the color scheme of the colored threads depending on the embroidery pattern. When changing the bobbin thread color scheme, the embroidery sewing machine is temporarily stopped, but the time it takes to change the color scheme of the colored threads to match the pattern varies depending on the number of sewing machines, but it can be as short as 1 hour (6 for up to 6 hours (24 hours)
head). As a result, the time the sewing machine is stopped due to changing embroidery patterns becomes longer, reducing its operating rate and even affecting production capacity.

Further, the end portions of each color yarn slightly unwound from each bobbin of a large number of bobbins set up on the spindle may become entangled with each other, making it inconvenient to use.

In the present invention, a large number of bobbin cases storing one bobbin each are arranged in a rotating frame, so that a large number of colored threads can be held even in a narrow space like a large Ferris wheel at an amusement park, and the thread ends are prevented from getting tangled. This is what I did.

[Means for solving problems]

One or two rotating frames, in which bobbins are stored and bobbin cases with case bases installed at the bottom, are suspended and supported at fixed pitches in the circumferential direction of the rotating frames, and one is installed at a fixed position for sewing. The push rod drives the rotating frame to stop the bobbin case and pushes up the thread hook link that lets out the thread from the bobbin case in a fixed position, and the push rod that moves the thread from the bobbin through the thread take-up thread take-up to the needle hole during storage. A cam is provided that rotates a case base equipped with a thread hooking pin that absorbs the drawn-out thread.

[Effect]

Two rotating frames with multiple bobbin cases suspended from the outer periphery are placed next to each other, and when embroidery is being performed using the bobbin cases of one rotating frame, the pins of the stopped rotating frame are connected to the solenoid. The rotation frame is removed from the drive shaft during operation, and the rotating frame is set in a free state, so that even while the sewing machine is running, preparations can be made for changing the color combination of colored threads to match the next pattern, so there is no need to stop the sewing machine when changing the color combination of colored threads for this pattern color scheme. This greatly reduces the time required, and in addition, each bobbin case can store the required length of thread from the bobbin through the thread take-up to the needle tip, which is approximately 50 to 70 cm, along the outer circumference of the bobbin case. The thread end can be easily and quickly inserted into the needle hole using the thread end.

〔Example〕

The present invention will be explained below based on the illustrated embodiments.

In the figure, reference numeral 1 denotes a frame of a thread supply device installed at a predetermined position on the body frame (not shown) of an embroidery sewing machine. At least two rails 2, 2 which are parallel to each other in the direction between the sewing machine heads are integrally provided, and a moving frame 4 having saddles 3, 3 provided at the lower part thereof is provided on the rails 2, 2 so as to be able to freely move laterally. saddle 3
is supported on the upper part of the rail 2 and is slidable. The movable frame 4 has two brackets 42 and 43 formed on a movable table 41 projecting diagonally upward, and the upper end of the movable frame 4, that is, the brackets 42, 43,
A drive shaft 5 is inserted through this bracket at the upper end of 43.
and supports one or a pair of rotating frames 61 and 62 as shown in the figure on this drive shaft,
The rotating frames 61 and 62 are rotated by driving the shaft 5. The drive shaft 5 is disposed horizontally between adjacent sewing machine heads, and is configured to be selectively rotated in the forward and reverse directions by a drive member at one end side or at an arbitrary position. One drive shaft is provided for each main body, and a movable frame 4 for each of the sewing machine heads is disposed so as to be slidable in the longitudinal direction of the shaft.
The rotary frame 61 and the rotary frame 62 are two identical frames placed adjacent to each other, inserted between the brackets 42 and 43, and fixed to the drive shaft 5. Next, one of the rotating frames 61 will be explained, and the explanation of the rotating frame 62 will be omitted. Two rotary frames 61 of the same shape are arranged oppositely at a required interval, a boss 63 is arranged and fixed in the center, the drive shaft 5 is passed through and supported by this boss 63, and a solenoid 64 is provided on the boss. This solenoid 64 is provided with a pin (not shown) that locks or releases the lock between the boss 63 and the drive shaft 5, and when the solenoid 64 is operated, the pin locks the boss of the rotating frame and the drive shaft. The rotating frame is rotated freely with respect to the drive shaft by releasing the pin lock. The pin that locks the boss/drive shaft is always locked, and the rotating frame can freely rotate only when the solenoid is operated.

On the outer periphery of the rotating frame 61, locking pins 65, 65, . . ., which swingably suspend and support the bobbin cases _K1 , _K2 , _K3 , . . This is provided so as to protrude from the inner surface of the rotating frame 61 so as to face each other, and the opposing locking pins 6
The bobbin cases K ₁ , K ₂ , . . . Kn between 5 and 65 are made removable and supported.

A plurality of bobbin cases K ₁ , K ₂ , K ₃ . . . Kn all have the same shape. This bobbin case K has a case body 70 in the form of a cylinder with an open top and a bottom for storing the bobbin B therein.A spindle 71 into which the bobbin B is inserted is protruded from the center of the interior of the case body 70. The case body 70 is fitted into a case base 72 having a shape, and a spring 73 is interposed between the case bases 72, so that the action of the spring 73 returns the case base 72 to its original position.

A rod guide 74 is provided protruding from the outer periphery of the case body 70, and a spindle 71 is attached to this rod guide 74.
It passes through the rod 8 in parallel with the thread, and a thread hook link 81 is provided at the upper end of the rod 8 to protrude in the lateral direction.
A threading hole is drilled at the tip of the link 81 so that the threading hole 82 is positioned above the spindle 71. Furthermore, a return spring 83 is installed at the bottom of the rod 8 between the rod guide 74 and the rod 8. It is provided between it and the spring receiver 84 provided at the bottom. In addition, on the outer surface of the case base 72, there are two or three wires in the vertical direction.
The thread hooking pins 75, 75 are provided protrudingly, and the thread hooking pins 75, 75 are inserted into the grooves 77 formed in the case body circumferential direction, and the thread hooking pins 75 are inserted into the grooves 77 at a predetermined angle. so that it moves. This thread hooking pin 75 is moved by the case base 72.
This is done by rotating two pins 76, 76 protruding from the lower surface of the case base 72, which are engaged with cams.

As shown in FIG. 4, the bobbin case main body 70 has two thread hooks 78 and 79 that are opposed to each other in a substantially horizontal direction.
The thread hanging tools 78 and 79 are arranged at positions where they protrude from the outer peripheral surface of the rotating frame when the bobbin case is suspended from the rotating frame, so that the thread drawn out from the bobbin case is guided to the thread take-up and the needle. Make sure that the required tension is obtained when it is rolled. Further, hangers 80, 80 are provided at two positions facing the upper outer peripheral surface of the case body 70 for hanging and supporting the locking pins 65, 65 of the rotating frame 61, and the hanger 80 rotates around the locking pins 65. The case body 70 swings due to the rotation of the rotating frame 61 under its own weight so that the center of the case body passing through the center of gravity is always vertical. Therefore, the attitude of the case body is automatically controlled so that the upper opening surface of the case body is always in the upper position and the case base 72 is in the lower position, no matter where the case body is suspended at any position on the outer periphery of the rotating frame.

In addition, the two rotating frames 61 and 62 are moved laterally so that one of the rotating frames 61 and 62 is at the sewing position, but the position is lower than the vertical line passing through the center of the rotating frame on the side that is in the sewing position (at the normal position). ) so that the thread used for embroidery is fed out only from the bobbin case suspended from the bobbin case. A cam 9 is rotatably supported by a bearing 10 supported by a frame (not shown) at a position facing the lower part of the bobbin case in this fixed position.
When the suspended bobbin case comes to the fixed position by the rotation of the rotating frame 61 or 62,
The pins 76, 76 are automatically inserted into a cam groove 91 formed in the cam 9. A pinion 92 is integrally provided with this cam 9,
A rack 93 is engaged with this pinion 92. When there are multiple sewing machine heads, each sewing machine head is provided with one cam, but the racks are arranged so as to be connected between all the sewing machine heads, and by moving this one rack 93, all the sewing machine heads can be connected. The cam 9 can be rotated.

By rotating the cam 9 through this rack through a predetermined angle, the case base 72 is rotated via the pin 76. In addition, a push rod 11 for pushing up the rod 8 of the bobbin case stopped at this fixed position from below is disposed opposite to the lower position of the rod 8, and a cylinder 12 and other lifting machines are attached to the rod 11 on the main body frame (not shown). ).

Next, the operation of the apparatus configured as described above will be explained.

The colored threads to be used according to the pattern of either the rotating frame 61 or 62 are stored in each bobbin case, and the bobbin cases K ₁ , K ₂ , . . . , 65 to lock it. At this time, match each bobbin case to the color scheme of the pattern. Further, the solenoid is operated to release the engagement between the boss 63 of the rotating frame 61 and the shaft 5, so that the rotating frame 61 can rotate freely. Also, rotating frame 6
1. When the rod of the bobbin case which is in a fixed position is pushed up with a push rod by the stopper pin 66 provided on the straight line connecting the locking pin 65 and the center of the rotating frame and inside the locking pin 65, the bobbin case floats. prevent. Therefore, in the horizontal direction to the left and right of the normal position of the rotating frame, the stopper pin 66 is in a position where it does not touch the upper end surface of the bobbin case, so that the bobbin case is hung from or removed from the rotating frame at this position. After hanging the required number of bobbin cases in this manner, the rotating frame 61 is moved to the sewing position. This moves the moving frame 4 to the rail 2
This can be easily done by pressing along the

Note that a predetermined colored thread bobbin B is stored in advance in each bobbin case suspended and supported on the rotating frame 61, and after the thread end is inserted into the threading hole 82 of the threading link 81,
Hang it on the thread hooks 78 and 79, and further rotate the case base 72 against the case body against the spring 73.
Place the thread into the hole H, with the holes H, H drilled in the case body and the position of the thread hooking pin facing each other vertically.
When the external force on the base 72 is released, the spring 73
The case base 72 rotates, and the bobbin thread is approximately
The yarn is let out by 50 to 70 cm, and then hooked two to three times in a zigzag pattern between the hole H and a yarn hooking pin spaced apart from this position, and then stored, with the end of the yarn hanging slightly below the hole H.

This rotary frame 61 rotates the drive shaft 5 to the left or right in integer multiple pitches between the bobbin cases suspended and supported in the circumferential direction of the frame to accommodate the desired color thread and match it to the pattern. The bobbin case, arranged in different colors, is stopped in place and used. When embroidering is performed using the thread in the bobbin case that is stopped at a fixed position, the cam 9 is driven by a simple operation to return the thread hooking pins 75, 75 against the spring 73 to the same position as when the thread was inserted. At this time, the thread end stored in the groove 77 of the bobbin case by this thread hooking pin is smoothly led out from the hole H, passed through the thread take-up, and guided to the needle hole. This can be done manually or by using an automatic threading mechanism. This color change is achieved by storing the color scheme in the bobbin case suspended in the circumferential direction of the rotating frame in advance in the CPU, and controlling and rotating the rotating frame using signals from the CPU. The end of the thread is passed through the thread take-up and needle hole from the bobbin case that is stopped in a fixed position.
At this time, the rod 8 is pushed up by the cylinder 12 via the push rod 11, and the thread is raised to a required height above the bobbin by the thread hooking link and the thread hook 7 is raised.
It will surely lead to 8 and 79 and be played out. The rod 8 is kept in the raised state while the thread is being used in the bobbin case stopped at this fixed position.

When changing the thread, when the push rod 11 is lowered, the rod 8 is lowered by the action of the spring 83 and also drives the rack 93. When this rack is driven, the thread hanging link 81 descends, causing the thread unwound from the bobbin to become slack. However, in order to rotate the cam via the rack, the case base is connected via the pin 76 locked to the cam. This causes the thread hook pins 75, 75 to swing, and the thread is hung in a zigzag manner between the two thread hooks 78, 79, absorbing a length of about 50 to 70 cm of the drawn thread, and then used. I'll wait again.

After stopping the thread feeding from the bobbin case in the fixed position, the rotating frame is rotated so that the bobbin case containing the desired colored thread is brought to the fixed position.
After selecting a color, it is used in the same manner. While embroidering is being performed using one rotating frame 61 in this way, the other rotating frame 62 is filled with a colored thread that matches the embroidery pattern (pattern) and then stored in the bobbin case. 62 locking pin 65,
65 to prepare for the next job.

〔Effect of the invention〕

The present invention has two rotating frames adjacent to each other, each of which houses a bobbin and has a bobbin case provided with a case base at the bottom, which is suspended and supported in large numbers at fixed pitches in the circumferential direction of the rotating frame.
There is also a push rod that drives the rotating frame to stop one bobbin case at a fixed position for sewing, and a push rod that pushes up the thread hook link that lets out thread from the bobbin case in the fixed position, and a case base that absorbs excess thread that is drawn out when changing the thread. Since a cam is installed to rotate the table, a large number of threads can be held in the sewing machine head in a narrow space, and when one rotating frame is in use, the other rotating frame can be used to start the next job. This has the advantage of improving work efficiency because preparations can be made.

[Brief explanation of drawings]

1 is a front view, FIG. 2 is a side view, FIG. 3 is a sectional view of the bobbin case, and FIG. 4 is a plan view thereof. B is a bobbin, _K1 to Kn are bobbin cases, 5 is a drive shaft, 61 and 62 are rotating frames, 70 is a case body,
72 is a case base, 8 is a rod, 81 is a threading link, 9 is a cam, and 11 is a push rod.

Claims (1)

[Claims] 1 One or more rotary frames, in which bobbins are housed and a number of bobbin cases with case bases provided at the bottom are suspended and supported at fixed pitches in the circumferential direction of the rotary frame, are placed adjacent to each other and fixed at fixed positions for sewing. A push rod that drives a rotating frame to stop two bobbin cases and pushes up a thread hook link that lets out thread from a bobbin case in a fixed position, and a push rod that pushes up a thread hook link that lets out thread from a bobbin case in a fixed position, and lets out a required length of thread that is inserted from a bobbin through a thread take-up and into a needle hole during storage. A thread supply device for an embroidery sewing machine, characterized in that a cam for rotating a case base equipped with a thread hooking pin for absorbing thread is provided.