JPH0673581B2 - Automatic take-out device for bobbin case of sewing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial sewing machine, and more particularly to a device for automatically removing a used bobbin thread bobbin case from a sewing machine hook.

[0002]

2. Description of the Related Art Conventionally, in an industrial sewing machine which has been continuously used for sewing for a long time, the sewing work can be efficiently performed by eliminating the interruption time of the sewing work due to the consumption of the bobbin thread and the labor of the bobbin replacement work as much as possible. In order to ensure good performance, the lower thread bobbin case is efficiently replaced. For example, as described in Japanese Patent Publication No. 54-5745,
Prepare a plurality of hooks equipped with bobbin thread bobbin cases immediately below and around the sewing machine needle, and when the thread of the bobbin thread bobbin in the hook just below the sewing machine needle runs out, put the hooks on the sewing machine needle. An apparatus has been developed which is configured to automatically perform a hook replacing operation by moving a hook containing a new lower thread bobbin case to a position right below a sewing machine needle, while moving the needle directly below.

[0003]

However, in the above-mentioned prior art, since the shuttle containing the bobbin bobbin case is replaced, the capacity of the shuttle itself is large and many replacement shuttles should be prepared. Is difficult in terms of space,
It is not suitable for automatically continuing a long sewing work. Moreover, since the price of the kettle itself is not low, it is economically difficult to prepare many spare ones.

For this reason, the present inventors have found that
As described in Japanese Patent No. 9072, a side between a front surface of a lower thread bobbin case mounted in a sewing machine hook and a bobbin locking claw operation plate movably mounted on the front surface of the lower thread bobbin case. After inserting the insertion locking piece from one side to raise the bobbin claw operation plate, move the insertion locking piece forward to pull out the lower thread bobbin case from the sewing machine hook and drop it downward. We have developed an automatic take-out device for bobbin bobbin cases.

However, in general sewing machines for sewing work, there is a sewing machine in which the bobbin engaging pawl operating plate stands up to an angle of 90 degrees or more because the bobbin thread bobbin case is often used continuously for many years. In such a case, even if the insertion locking piece is inserted on the back side of the bobbin locking claw operation plate, the tip of the insertion locking piece cannot be locked to the inner surface of the operation plate, and the bobbin thread There was a problem that the bobbin case could not be taken out, and the sewing machine needle could be broken or the machine could run idle without the bobbin thread. SUMMARY OF THE INVENTION It is an object of the present invention to provide an automatic take-out device for a bobbin bobbin case, which can completely solve such problems.

[0006]

In order to achieve the above object, a lower thread bobbin case automatic take-out device of a sewing machine according to the present invention is provided with a front surface of a lower thread bobbin case mounted in a sewing machine hook and the lower thread bobbin case. The insertion locking piece that can be inserted from the side between the bobbin locking claw operation plate that is mounted on the front surface of the undulation, and the front side of the insertion locking piece with a small gap A receiving piece, which is arranged in parallel and receives the tip end portion of the bobbin engaging claw operating plate, and an operating plate holding member including the inserting engaging piece and the receiving piece are provided from the side of the sewing machine hook. After moving to the front of the sewing machine hook and moving from that position to the front,
The gripping member actuating mechanism for returning to the original position.

[0007]

When the lower thread wound on the bobbin in the lower thread bobbin case mounted in the sewing machine hook is consumed by the sewing work, the holding member of the insertion locking piece and the receiving piece is used. When the operating mechanism is operated to move the gripping member from one side on the front surface side of the bobbin thread bobbin case to the front surface side of the bobbin thread bobbin case, the insertion locking piece and the bobbin thread bobbin case It is inserted between a bobbin locking claw operating plate which is mounted so as to be able to move up and down, and the receiving piece covers the front surface of the operating plate with a small gap.

Since the base end portion of the bobbin engaging pawl operating plate is pivotally attached to the bobbin case in such a manner that the bobbin engaging pawl operating plate can be raised and lowered, the bobbin engaging pawl operating plate is inserted into the bobbin engaging pawl operating plate from the tip end side thereof. On the other hand, the receiving piece, which is arranged in parallel with the insertion locking piece, reaches the front side of this operation plate, so that the tip of the operation plate is received when the operation plate stands up to an inclination angle of 90 degrees or less. It comes into contact with and is received by the stop plate. Therefore, the bobbin locking claw operating plate is held by the insertion locking piece and the receiving piece.

From this state, when the actuating mechanism is actuated in a direction perpendicular to the above-mentioned actuating direction and the gripping member consisting of the inserting locking piece and the receiving piece is moved in the direction away from the sewing machine hook, the inserting mechanism is inserted. With the tip of the locking piece locked to the slanted inner surface of the bobbin locking claw operating plate, the operating plate is pushed forward and the bobbin case provided with this operating plate is instantaneously released from the sewing machine hook. When the bobbin case is pulled out from the sewing machine hook, the bobbin case is inserted by its own weight to disengage the operation plate from between the locking piece and the receiving piece, and falls down, so that the bobbin case storage box installed below is lowered. Is stored in. On the other hand, the gripping member is returned to its original position by the actuating mechanism to prepare for taking out the next bobbin thread bobbin case.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.
Reference numeral 1 is a gripping member of the bobbin locking claw operating plate B of the bobbin thread bobbin case A, which is composed of an insertion locking piece 2 and a receiving piece 3 which are integrally arranged side by side with a small space in the front and rear. The base end of the gripping member 1 is attached to the actuating mechanism 4, and the actuating mechanism 4 operates to advance and retract from one side with respect to the front surface of the bobbin thread bobbin case A shown in FIGS. It is constructed so that it can be moved in a direction perpendicular to the advancing / retreating direction.

In the sewing machine for sewing, a sewing machine hook C is arranged just below the sewing machine needle, and a lower thread bobbin case A accommodating a bobbin wound with a lower thread is attached to and detached from the sewing machine hook C. It is installed freely. In this mounted state,
The bobbin engaging claw operating plate B pivotably attached to the front surface of the bobbin thread bobbin case A is superposed on the bobbin thread bobbin case A by a spring force, and A is mounted in the sewing machine hook C with its front surface slightly projecting forward from the sewing machine hook C. Further, a rectangular through hole b is provided in the center of the bobbin locking claw operation plate B, and the tip end of the operation plate B has a shape which is bent and inclined forward toward the front, There is a gap between the bent tip portion and the outer peripheral portion of the front surface of the bobbin thread bobbin case A.

The insertion locking piece 2 disposed inside the gripping member 1 is inserted into the gap between the lower thread bobbin case A and the bent tip of the bobbin locking claw operating plate B to perform the operation. It is formed of a thin elastic plate piece capable of sliding contact with the inner surface of the plate B, and at least the width of the tip portion is formed to be smaller than the width of the bobbin engaging pawl operating plate B in order to ensure its insertion. The length is formed in a rectangular shape slightly longer than the length of the bobbin locking claw operating plate B.

On the other hand, the receiving piece 3 disposed outside the insertion locking piece 2 is a rectangular elastic plate piece having substantially the same width and the same length as the insertion locking piece 2. A locking hole 5 for locking the tip of the bobbin locking claw operating plate B is formed in the tip. The insertion locking piece 2 and the receiving piece 3 are arranged side by side with a small gap in the front and rear, and their base ends are integrally fixed to the operating mechanism 4.

The distance between the insertion locking piece 2 and the receiving piece 3 is set so that the bobbin locking claw operating plate B can be gripped while being regulated in a state of being inclined at an obtuse upright angle. Often,
The spacing can be adjusted by interposing a spacer 12 having a desired thickness between the base end portions of the insertion locking piece 2 and the receiving piece 3, but as shown in the figure, the insertion locking piece 2 can be adjusted. It may be adjusted by refracting the intermediate portion in a direction away from the receiving piece 3.

An actuating mechanism 4 for moving the gripping member 1 forward and backward in its lengthwise direction and in a direction perpendicular to the forward and backward direction.
Is a first air cylinder 6 having two rods 6a, 6a that reciprocate with respect to the sewing machine hook C from one side of the sewing machine hook C, and the first air cylinder 6 is brought into contact with and separated from the sewing machine hook C. A second air cylinder 7 that moves back and forth in the forward and backward directions. The second air cylinder 7 is fixed to a fixed seat 8 fixed to one side of the sewing machine hook C, and two rods that expand and contract in the forward and backward directions. The tips of 7a, 7a are fixed to the first air cylinder 6.

A mounting metal fitting 9 is fixed to the tips of the rods 6a, 6a of the first air cylinder 6, and the gripping member 1 is housed in the sewing machine hook C on the lower metal thread bobbin case A. The base end portion of the bobbin locking claw operating plate B is fixed with screws or the like in a state of being directed toward the front end. In addition, operating air is sequentially introduced into the first and second air cylinders 6 and 7 in response to an appropriate signal generated by the consumption of the lower thread in the lower thread bobbin case A. Conduits 10, 11 are connected respectively.

The operation of the bobbin thread bobbin case take-out device thus constructed will be described. When the thread of the bobbin thread bobbin case A in the sewing machine hook C is consumed during sewing, it is reached that the consumption state should be replaced. When an appropriate signal, for example, a signal generated when the sewn product reaches a length commensurate with the length of the thread wound around one bobbin bobbin, first the first air cylinder 6 is activated by the signal. Then, the rods 6a, 6a extend, and the gripping member 1 fixed to the tip of the rod 6a is moved from one side toward the front side of the bobbin thread bobbin case A to insert the gripping member 1. Attach the tip of stopper 2 to bobbin case A
The bobbin locking claw is inserted into the tip inner surface side of the operation plate B, and the receiving piece 3 is moved in parallel along the outer surface of the operation plate B. That is, the bobbin locking claw operating plate B is relatively inserted between the insertion locking piece 2 and the receiving piece 3.

When the gripping member 1 moves in this way from the tip end side of the bobbin engaging pawl operating plate B toward the base end, the tip end of the insertion engaging piece 2 slides on the inner surface of the bobbin engaging pawl operating plate B. While the operation plate B is advanced to stand up against the spring force, the tip of the operation plate B is brought into contact with and received by the inner surface of the receiving piece 3 to regulate the rising angle. Then, the insertion locking piece 2 is engaged with the through hole b formed in the central portion of the operation plate B, and the tip of the operation plate B is inserted and locked in the locking hole 5 of the receiving piece 3. As a result, the operation plate B is maintained in its standing posture in an acutely inclined state with respect to the front surface of the bobbin thread bobbin case A as shown in FIG.

Until this state is reached, the first air cylinder 6
Is operated to stop the entrance of the gripping member 1, and then the second air cylinder 7 is operated in conjunction with the stop to extend the rods 7a, 7a. By this extension of the rod, the holding member 1 holding the bobbin locking claw operating plate B moves in a direction away from the sewing machine hook C, and the lower thread bobbin case A is pulled out from the sewing machine hook C. At this time, the bobbin engaging pawl operating plate B is pushed in the longitudinal direction of the core rod D standing upright in the middle of the sewing machine hook C by the inserting engaging piece 2 and the receiving piece 3 of the holding member 1. The lower thread bobbin case A is smoothly removed along the core rod D.

When the lower thread bobbin case A is detached from the sewing machine hook C, the bobbin engaging claw operation plate B is automatically disengaged from the gripping member 1 by the weight of the lower thread bobbin case A, and falls down. It is stored in the case storage box. Second
When the rod 7a of the air cylinder 7 extends to a position where the lower thread bobbin case A can be removed, the first air cylinder 6
Is operated to pull the gripping member 1 laterally from the front of the sewing machine hook C, and then the rod 7a of the second air cylinder 7 is contracted to return to the original position to prepare for taking out the next bobbin thread bobbin case. Is. In this way, a new bobbin thread bobbin case A is mounted on the empty sewing machine hook C by an automatic mounting device (not shown) for the bobbin thread bobbin case A.

Although the receiving piece 3 of the gripping member 1 is provided with the engaging hole 5, such an engaging hole 5 is not always necessary, and in short, the tip of the bobbin engaging claw operating plate B. 2 to prevent the bobbin engaging claw operating plate B from standing up to 90 degrees or more and to stand up together with the inserting locking piece 2 at an inclination angle of 90 degrees or less. It may be possible to maintain the state. Further, as the actuating mechanism 4 of the gripping member 1, it goes without saying that a hydraulic type or electric type operating means may be adopted in place of the air cylinder.

[0022]

As described above, according to the take-out device for the bobbin thread bobbin case of the present invention, the bobbin thread bobbin case mounted in the sewing machine hook is attached to the front surface of the bobbin thread bobbin case and the front surface of the bobbin thread bobbin case so that the bobbin thread bobbin case can move up and down. Since the insertion locking piece is inserted from the side between the bobbin locking claw operating plate and the bobbin locking claw operating plate, the bobbin locking claw operating plate is raised by inserting the insertion locking piece. The insertion locking piece can be locked on the inner surface of the bobbin locking claw operation plate, and the receiving pieces are integrally arranged side by side on the front side of the insertion locking piece with a small gap. Therefore, the tip of the bobbin locking claw operating plate can be brought into contact with and received by the inner surface of the receiving plate to regulate the rising angle thereof. Therefore, even if the bobbin bobbin case is worn out and it is difficult for the bobbin locking claw operating plate to stop at the regular upright angle, the insertion locking piece and the receiving piece should surely hold the bobbin locking claw operating plate. Is something that can be done.

Further, the gripping member consisting of the insertion locking piece and the receiving piece is moved toward the bobbin locking claw operating plate side by the operating mechanism as described above, and then in the direction away from the bobbin hook. Since it can be moved, the bobbin thread bobbin case having the bobbin locking claw operation plate can be easily and surely pulled out from the bobbin hook, and the bobbin thread bobbin case can be replaced promptly to improve the sewing work efficiency. This bobbin case unloading device handles only the lower thread bobbin case having a diameter smaller than that of the bobbin hook and has an extremely simple structure including the gripping member and the operating mechanism as described above. Therefore, the industrial sewing machine can be arranged in a proper place in the space without any problem in terms of space.

[Brief description of drawings]

FIG. 1 is a simplified perspective view of the entire apparatus,

FIG. 2 is a perspective view of a lower thread bobbin case mounted in the sewing machine hook;

FIG. 3 is a perspective view showing a state in which a lower thread bobbin case is taken out.

[Explanation of symbols]

 1 gripping member 2 insertion locking piece 3 receiving piece 4 actuating mechanism 6 first air cylinder 7 second air cylinder A bobbin bobbin case B bobbin locking claw operating plate C sewing machine hook

Claims (1)

[Claims] 1. An insertion insertable from the side between a front surface of a bobbin thread bobbin case mounted in a sewing machine hook and a bobbin locking claw operation plate mounted on the front surface of the bobbin thread bobbin case so as to be up and down. The engaging locking piece, a receiving piece that is installed in parallel on the front surface side of the inserting locking piece with a small interval and receives the tip end portion of the bobbin engaging pawl operating plate, and these receiving pieces. A gripping member for moving the operating plate gripping member, which is composed of a locking engagement piece and a receiving piece, from the side of the sewing machine hook to the front surface of the sewing machine hook, and after moving from that position to the front, returns to the original position. An automatic take-out device for a bobbin case of a sewing machine, which comprises an operating mechanism.