JPH0947589A - Button sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a button sewing machine avoid interference between the feed arm and a sewn button even without a power source except for a cam power source to reduce cost and to reduce the cycle time compared to one with another power source. SOLUTION: This button sewing machine is constituted so as to move a button pick foot 3 and a feed arm 4 according to one cycle motion of a cam 6 by a cam power source 5. The machine is constituted so that drive by the cam power source 5 is temporarily stopped after button release motion by the button pick foot 3 and before a button is positioned at the button transfer position, and, after the temporary stop is performed, the sewn matter is moved by a feed means 2 to a position under the needle where the next button is to be sewn down and, after the sewn button is moved from the point under the needle, the cam drive power source is driven again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a button sewing machine.

[0002]

2. Description of the Related Art As a conventional sewing machine with buttons, a button gripping foot that can hold / release buttons and can be raised / lowered, a button carrier arm that can supply buttons to a button delivery position, and a body (sewn product) A body carrier device plate (sewn product moving means) that sequentially moves the body for each button sewing so that the button sewing position is located under the needle is known.

In this button sewing machine, when the sewing (one-over) of a predetermined button is completed, the button carrying arm holding the next button starts moving from the button receiving position to the button delivering position. , At about the same time, while releasing the holding of the sewn button held on the body by the button picking foot, the button picking foot rises, and during or after the rising, The button transfer arm that holds the button
The button pick-up leg reaches the button passing position between the body and the body, and the button-picking leg receives and holds the next button at this button passing position. During this time, the body is moved by the body conveying device plate, and the next button sewing position on the body is located below the needle. Then, the button carrying arm retracts from the button delivery position and returns to the button delivery position.

Each operation of the button picking leg and the operation of the button carrying arm are performed in accordance with one cycle operation of the cam by the cam power source. When the button carrying arm returns to the button receiving position, the button picking operation is performed. The foot can be lowered to the next button sewing position on the body so that the next button can be sewn at the next button sewing position on the body. That is, a plurality of buttons can be continuously sewn on the body.

[0005]

However, the above button sewing machine has the following problems. That is, when the body and buttons are thick, if the next button is supplied to the button delivery position by the button carrying arm, the button carrying arm interferes with the already sewn button.

[0006] Therefore, in order to prevent such a problem from occurring, another power source is connected to the button-picked foot for the opening operation of the sewn button and the raising operation of the button-picked foot by the button-picked foot. By moving the body by means of the body carrier plate during this raising operation, and after moving the body, disconnecting another power source from the button-picked leg and driving the cam power source. Although a series of operations of the above-mentioned button picking leg and button carrying arm are performed, the cost is high because there are two power sources, and the cycle time is long because useless idle time is generated in the cam. There is a problem such as.

Therefore, in the present invention, the interference between the button carrying arm and the sewn button is avoided without any other power source other than the cam power source, the cost is reduced, and another power source is provided. An object of the present invention is to provide a sewing machine with a button, which has a shorter cycle time than that of the sewing machine.

[0008]

In order to achieve the above-mentioned object, a button-attached sewing machine according to a first aspect of the present invention is provided with a button gripping foot capable of holding / releasing a button and capable of ascending / descending, and a raised button gripping foot and sewing. A button carrying arm capable of supplying a button to a button passing position between the sewing machine and a sewing machine moving means for sequentially moving the sewing machine every time the button is sewn so that the button sewing position on the sewing machine is located below the needle. And when the sewing of a predetermined button is completed, the holding of the sewn button held on the sewn product is released by the button gripping foot, the button gripping foot is raised, and the button conveyance is performed. After holding the button supplied to the button delivery position by the arm by the button gripping leg, the button carrying arm is retracted from the button delivery position, and the one stitch is sewn. A button sewing machine which is adapted to move said workpiece by said sewing movement means after the button opening operation by the button knob foot After the completion,
In a button-attached sewing machine in which each operation of the button picking leg and the operation of the button carrying arm are performed in accordance with one cycle operation of a cam by a cam power source, the button carrying operation is performed after the button opening operation by the button picking foot. Before the button is positioned at the button transfer position by the arm, the driving of the cam power source is temporarily stopped, and after that, when the sewn button is moved at least from under the needle by the sewn product moving means, the cam power source is re-driven. It is characterized by doing.

In order to achieve the above-mentioned object, the button-attached sewing machine according to a second aspect of the present invention is, in addition to the first aspect, a position detecting means for detecting a position related to a cam position by issuing a temporary drive stop command to a cam power source. It is characterized by giving according to.

According to the button sewing machine in such means, the driving of the cam power source is temporarily stopped after the button opening operation by the button gripping foot and before the button is positioned at the button delivery position by the button carrying arm. ,
When this temporary stop is made, the sewn product is moved by the sewn product moving means so that the next button sewing position on the sewn product is located below the needle. The source is re-driven. Therefore,
The interference between the button carrying arm and the sewn button is avoided even if there is no other power source other than the cam power source. In addition, there is no wasteful idle time of the cam in the above series of operations.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a button sewing machine according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a button-attached sewing machine main body, and 2 denotes a body-conveying device plate (sewn-material moving means) arranged below the needle 1a of the button-attached sewing machine main body 1 for holding a body (sewn material). . As shown in FIG. 5, the body transporting device plate 2 includes plates 2a and 2b having openings. The upper plate 2a is movable in the vertical direction of the arrow by driving the air cylinder 41.
By vertically moving the body 1, the body can be clamped between the lower plate 2b. Also, this body carrier plate 2
The a and 2b are in a state of being supported by the rack 42 which is moved in the horizontal direction of the arrow by the driving of the stepping motor 40, and when the predetermined button sewing is completed, the stepping motor 42 is driven to drive the body parts. It is possible to sew a plurality of buttons on the body by sequentially moving the buttons at desired intervals.

This sewing machine with buttons includes a button holding leg 3 which is provided below the needle and which can be opened and closed and which can be raised and lowered, and a button carrying arm 4 which can supply a button to the raised button holding leg 3. I have it. The button leg 3 and the button carrying arm 4 perform the above operation in accordance with one cycle operation of a cam 6 which is rotated by a DC motor 5 as a cam power source.

That is, the DC motor 5 drives to drive the cam 6
When is rotated, the button clamp foot opening / closing lever 7 pressed by the cam 6 by the urging force of the spring 8 swings in accordance with the shape of the cam 6, and in accordance with the swing of the button knob foot opening / closing lever 7, The button gripping foot 3 which is biased in the closing direction by the biasing force of the spring 8 opens and closes. Then, the button gripping foot 3 can hold the button by performing the closing operation, and can open the button by performing the opening operation.

Similarly, when the DC motor 5 is driven and the cam 6 is rotated, the first swing arm 9 pressed against the cam 6 by the urging force of the spring 12 follows the shape of the cam 6. The second swing arm 1 which swings and is connected to the first swing arm 9 in accordance with the swing of the first swing arm 9.
0 oscillates, and as the second swing arm 10 oscillates, the button-picking foot raising lever 11 moves up and down, and the button-picking foot raising lever 11 is fixed and urged downward by the urging force of the spring 12. The button-picking foot 3 that is being pushed up and down.

Similarly, when the DC motor 5 is driven and the cam 6 rotates, the third swing arm 13 pressed by the cam 6 swings following the shape of the cam 6, and the third swing arm 13 swings. 3 As the swinging arm 13 swings, the slide plate 14 moves forward and backward while being guided by the slide guide 15, and when the slide plate 14 moves forward and backward, the rotary shaft 17 rotates via the link mechanism 16. As the rotating shaft 17 rotates, the button carrying arm 4 connected to the rotating shaft 17 rotates about the rotating shaft 17 as a fulcrum. The button transfer arm 2 moves between a button receiving position for receiving a button from a button supplying device (not shown) and a button transferring position for supplying the button to the raised button gripping leg 3 by the above-described rotation operation. You can do it.

A disc 19a is fixed to the cam shaft 18 for rotating the cam 6. A notch 19c is formed at one location on the outer circumference of the disc 19a, and a photosensor 19b capable of detecting the notch 19c is disposed at a facing position near the outer circumference of the disc 19a. This notch 19c
The position of is formed so as to coincide with the timing at which the button gripping leg 3 rises while releasing the sewn button.

FIG. 2 is a block diagram showing the control system of the button sewing machine. In the figure, reference numeral 20 indicates a CPU as a control means, and an output side of the CPU 20 gives a control instruction to a body conveying device plate driver 21 and a DC motor 5 which give a control instruction to the body conveying device plate 2. D
In addition to the C motor driver 22, a sewing machine drive motor driver 23 for giving a control command to the sewing machine body 1 and an operation panel 24 are connected. Further, the disc 19 is provided on the input side.
The cam position sensor 19 as a position detecting means composed of a and the photo sensor 19b and the starting switch 25 of the sewing machine are connected.

The CPU 20 constantly monitors the operation of the sewing machine body 1 and sends a drive signal to the DC motor driver 22 when the button 1 has been pressed.
Further, when the notch 19c is detected by the cam position sensor 19, a drive temporary stop signal is sent to the DC motor driver 22, and the body conveying device plate driver 2
With respect to 1, the movement signal for moving the body conveying device plate 2 so that the next button sewing position on the body is located under the needle is sent. Furthermore, if the next button sewing position on the body is located under the needle by the movement of the body conveying device plate 2, a re-driving signal is sent to the DC motor driver 22.

The CPU 20 has a ROM 26 for storing a processing procedure in the form of a program and fixed data, and a RAM 2 for temporarily storing data used for calculation and calculation results.
7 is connected. The program written in the ROM 26 is shown in a flowchart of FIG. The operation of the sewing machine will be described below according to the program.

When the program starts, first in step 1, it is judged whether or not the sewing machine starting switch 25 is on. If it is off, the same judgment is repeated until it is turned on. If it is on, the process proceeds to step 2. , Step 2
In step 3, the button picking foot 3 is lowered to set the button held on the button picking foot 3 (for convenience of explanation, the button is already held on the button picking foot 3) to a predetermined position on the body. Then, the sewing machine is driven to proceed to step 3, and in step 3, it is judged whether or not the button 1 overlock has been completed. If the button 1 overlock has not been completed, the same determination is repeated until it is completed, and the process is completed. In this case, the process proceeds to step 4, and in step 4, the DC motor 5 is driven to rotate the cam 6.

Then, according to this cam operation, as shown in FIG.
As shown in (a), the button carrying arm 4 holding the next button 30b starts to move from the button receiving position shown by the phantom line toward the button delivering position, and the button-holding button 30a of the button gripping leg 3 is sewn. The button clamp foot 3 starts to rise while the holding of the button is released.

Then, the process proceeds to step 5, and in step 5, the above state, that is, the state in which the button clamp foot 3 starts to rise while releasing the holding of the sewn button 30a by the button clamp foot 3 is determined. To determine. This determination is made by detecting the notch 19c from the cam position sensor 19 described above.

If the above state has not yet been reached, the same judgment is repeated until this state is reached, and if the above state is reached, the routine proceeds to step 6. At this time, the button transfer arm 4 is in front of the button transfer position as shown in FIG. 3B.

Then, in step 6, the driving of the DC motor 5 is temporarily stopped and the driving of the button leg 3 and the button carrying arm 4 is temporarily stopped, and the process proceeds to step 7. In step 7, the next button sewing on the body is sewn. The body carrier plate 2 is moved so that the position is below the needle (see FIG. 3).
(See (c)) Proceed to Step 8, and in Step 8,
It is determined whether or not the next button sewing position on the body is located under the needle, and if it is not yet located, the same determination is repeated until it is located. If it is located, the process proceeds to step 9,
In step 9, the movement of the body conveying device plate 2 is stopped and the process proceeds to step 10. In step 10, the DC motor 5 is re-driven.

Then, the button picking leg 3 which was in the middle of rising
Is moved up to a predetermined position, and the button transfer arm 4 waiting on the front side of the button transfer position is
As shown in (d), the button transfer position between the raised button-picking leg 3 and the body is reached.

Then, the button gripping foot 3 descends to receive and hold the next button 30b held by the button carrying arm 4, and then the button carrying arm 4 retracts from the button passing position and receives the button. Return to position. Then, in step 11, it is determined whether or not the one-cycle operation by the cam 6 is completed, and if it is not completed, the same determination is repeated until it is completed,
When finished, the process proceeds to step 12, and in step 12, it is determined whether or not the next button 30b is continuously sewn. When the next button 30b is sewn, the process returns to step 2, and when the next button 30b is not sewn, that is, the sewing ends. In the case of, this flow ends.

As described above, in this embodiment, the button gripping foot 3 after the button opening operation by the button gripping foot 3 is performed.
The driving of the DC motor 5 is temporarily stopped when the next button 30b is positioned at the button delivery position by the button transport arm 4 when the button is raised, and if this temporary stop is made,
The body transporting device plate 2 moves the body so that the next button sewing position on the body is located under the needle, and when the next button sewing position is located under the needle, the DC motor 5 is re-driven to drive the DC motor. Even if there is no other power source other than 5, the interference between the button carrying arm 4 and the sewn button 30a is avoided, and there is no wasted idle time of the cam 6 in the above series of operations, so that the cost is low. It has become possible to reduce the cycle time.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say, for example, in the above embodiment, the notch 19 is formed in the disc 19a.
Although c is provided at one place to detect the timing when the button holding foot 3 is lifted after the button opening operation by the button holding foot 3, the disk 19a is a slit in which a large number of slits are formed on the outer circumference. Instead of the plate, the timing may be detected by the number of pulses corresponding to the number of slits output from the slit plate. Further, the cam position sensor 19 may be replaced with a position detecting means that detects, for example, the position of the button carrying arm 4 (for example, the position before the button transfer position) as a position related to the cam position.

Further, although the DC motor is used in the above embodiment, it may be replaced with an AC motor, for example. Further, the cam position detecting means can be omitted by replacing the servo motor and the stepping motor.

Further, in the above embodiment, the timing of the temporary stop of the cam 6 is set such that the button gripping foot 3 is being raised after the button gripping foot 3 releases the button.
However, the present invention is not limited to this, as long as it is after the button opening operation by the button picking foot 3 and before the button is positioned at the button delivery position by the button carrying arm 4.
It doesn't matter at any time.

Similarly, in the above embodiment, the timing of re-driving the cam 6 is set to the time when the movement of the body by the body conveying device plate 2 is completed, but the present invention is not limited to this, and the point is. It may be any time as long as the sewn button 30a is moved at least from under the needle by the body transport device plate 2.

[0032]

As described above, according to the sewing machine with buttons of the present invention, each operation of the button picking leg and the operation of the button carrying arm are performed in accordance with the one cycle operation of the cam by the cam power source. A sewing machine
The driving of the cam power source is temporarily stopped after the button is released by the button gripping operation and before the button is positioned at the button transfer position by the button carrying arm. When this temporary stop is made, the sewn product is moved by the sewn product moving means. When the sewn product is moved so that the next next button sewing position is located under the needle and the sewn button moves at least from under the needle, the cam power source is re-driven, and another power source other than the cam power source is driven. It is possible to reduce the cost because it is configured to avoid the interference between the button transfer arm and the sewn button even if there is not, and to avoid the idle rotation time of the cam in the above series of operations. In addition, the cycle time can be shortened.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a button sewing machine according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a control system of the same sewing machine.

FIG. 3 is a perspective view for explaining the operation of the button picking leg, the button carrying arm, and the sewn product moving means in the same sewing machine.

FIG. 4 is a flowchart showing an operating procedure of the sewing machine.

FIG. 5 is a detailed perspective view showing a sewing material moving means of the same sewing machine.

[Explanation of symbols]

 1a Needle 2 Sewing object moving means 3 Button picking foot 4 Button transport arm 5 Cam power source 6 Cam 19 Position detecting means 20 CPU 30a Sewing completed button 30b Next button

Claims (2)

[Claims] 1. A button gripping foot capable of holding / releasing a button and capable of rising / lowering, a button carrying arm capable of supplying the button to a button transfer position between the raised button gripping foot and the sewn product, and a sewn product. And a sewing product moving means for sequentially moving the sewing product every time the button is sewn so that the upper button sewing position is located below the needle. After releasing the holding of the sewn button held on the sewn product and raising the button gripping foot, after holding the button supplied to the button passing position by the button carrying arm by the button gripping foot, The button transfer arm is retracted from the button transfer position, and after the button opening operation by the button gripping leg after the completion of the one sewing, the button is moved to the sewn product moving means. Therefore, the button sewing machine is configured to move the sewn product, wherein each operation of the button picking leg and the operation of the button carrying arm are performed according to one cycle operation of the cam by the cam power source. In the step of, after the button is released by the button-picking foot, and before the button is positioned at the button transfer position by the button carrying arm, the driving of the cam power source is temporarily stopped, and then the sewing machine moving means performs sewing. A sewing machine with buttons, wherein the cam power source is re-driven when the completed button moves at least from under the needle. 2. The button sewing machine according to claim 1, wherein the temporary drive stop command to the cam power source is given according to a position detecting means for detecting a position related to the cam position.