JPH07144077A - Button discriminating device for sewing machine for fitting button - Google Patents

Abstract

PURPOSE:To surely switch a sewing mode corresponding to the plural kinds of buttons with the different numbers of holes with simple operations without requiring any complicated and dirty work. CONSTITUTION:A sewing machine control means 66 is provided with a mode deciding means 66a for automatically switching the sewing mode for each button type while being linked with a feeding amount adjusting means 96 at a cloth feeding mechanism to be operated corresponding to the buttons with the different numbers of holes, and the respective sewing modes are automatically executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a button discriminating apparatus for a button-attaching sewing machine which can efficiently attach a plurality of types of buttons having different numbers of holes.

[0002]

2. Description of the Related Art Generally, in the case of sewing with buttons, a cloth feeding device holding a material to be sewn and a button is arranged in two vertical and horizontal directions (X, Y directions) in accordance with the cam information of a cloth feeding cam. ) Each required amount. More specifically, the feed link mechanism in the vertical direction (Y direction) and the link mechanism in the horizontal direction (X direction) are respectively swung according to the cam surface of the cloth feed cam fixed to the main shaft, and both feed link mechanisms are moved. The cloth feeding mechanism connected to the above is configured to perform a predetermined cloth feeding operation.

When the sewing operation is completed after a predetermined number of stitches, the movable blade is reciprocated at the timing corresponding to the last stitch to perform thread cutting. The thread trimming mechanism for performing this thread trimming cuts the upper and lower threads connected to the needle and the hook from the work with a movable blade.
Various proposals have been made in, for example, Japanese Patent Laid-Open No. 2-622 or Japanese Utility Model Publication No. 2-17572. Regarding the above-described mechanical lockstitch button sewing machine, specifically, the thread trimming actuator (thread trimming cam arm) is swung by the cam surface of the thread trimming cam fixed to the main shaft, and the thread trimming actuator A predetermined operation is transmitted to the thread cutting mechanism via the appropriate link mechanism at the lower end, whereby the thread separating operation and the thread cutting operation are executed. The thread-cutting timing at this time is set by the cam information from the thread-cutting control cam that rotates once with a predetermined number of stitches in conjunction with the main shaft. That is, when the blocking frame is swung by the thread cutting control lever that is pressed against the cam surface of the thread cutting control cam and rocks, the thread cutting cam is moved by the release lever (cam arm return arm) interlocking with the blocking frame. The thread trimming actuating member is configured to come into contact with and separate from the cam surface of the thread cutting mechanism, and the thread trimming actuating member that transmits the thread cutting operation to the thread trimming mechanism is separated from the cam surface of the thread cutting cam during sewing. During thread cutting, it comes into contact with the cam surface of the thread cutting cam.

[0004]

However, in an apparatus configured to use the cloth feed cam and the thread trimming control cam for timing of buttoning and thread trimming, thread trimming is performed after buttoning is completed. The timing has to be a fixed timing determined by the cam surface of the thread trimming control cam, which causes inconvenience in use.

For example, with a sewing machine with a lockstitch button, as shown in FIG.
When sewing the 4-hole button 1 as shown in (b),
The thread is continuously sewn between the two holes 1a, 1a and 1b, 1b without performing thread cutting during one cycle from the start of sewing to the end of sewing. On the other hand, as shown in FIG. 13 (a), the two-hole button 3
When performing the sewing of the two holes 3a, a half cycle of the above-mentioned one cycle sewing operation is performed.
Sewing 3a. That is, the number of stitches of the two-hole button 3 is half the number of stitches of the four-hole button 1 described above. Even in the case of the two-hole button, the sewing operation may be performed in the entire cycle and the number of stitches may be doubled as usual.

In order to switch the sewing mode for a plurality of types of buttons having different numbers of holes, first, the movement amount of the cloth feed mechanism is changed by operating the feed amount adjusting means. For example, when the 4-hole button is switched to the 2-hole button during sewing, the vertical feed adjustment lever is used to set the vertical feed amount to "0". In addition to that, the shape of the thread cutting control cam 5 is changed as shown in FIG. That is, first, in the thread trimming control cam 5, a pair of recesses 5 is provided at two positions, which are obtained by dividing the outer peripheral portion of one cycle per cycle into half.
a and 5a are provided symmetrically. Then, the thread cutting control for each half-split cycle is performed based on the cam information from each of the recesses 5a. In the case of the two-hole button as shown in FIG. 13 (a) described above, when the thread trimming control cam 5 makes a half turn, the thread trimming operation based on the cam information of the recess 5a is performed after the half cycle of the sewing operation is completed. It is like this. On the other hand, when sewing a four-hole button, an arc-shaped cutoff auxiliary cam plate 5b is used, and the two recessed portions 5
One of a and 5a is covered with the interruption assisting cam plate 5b to form a thread cutting control cam for one cycle and one cycle. However, the work of mounting and removing the shut-off auxiliary cam plate 5b must be performed by tilting the sewing machine backward and putting a hand from the back side, which is very troublesome work, and oil and the like. Often soils the hands.

Further, when the sewing operation is performed without forgetting the work of mounting and removing the interruption assisting cam plate 5b described above, the sewing machine may stop halfway or two sewing buttons may be sewn even if the four-hole button is sewn. There are times when you make a mistake in the number of stitches when sewing hole buttons, and you have to redo the sewing.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a button discriminating apparatus for a button sewing machine which can surely switch the sewing mode for a plurality of types of buttons having different numbers of holes by a simple operation. To do.

[0009]

To achieve the above object, a first aspect of the present invention relates to a cloth feed cam which is rotated once by a predetermined number of stitches in conjunction with a main shaft to perform a predetermined cloth feed operation, and a cloth feed cam. A cloth feed mechanism that oscillates following the cam surface of the cam and moves a required amount in two vertical and horizontal directions that are orthogonal to each other while gripping the button and the workpiece, and a vertical and horizontal direction in the cloth feed mechanism. A feed amount adjusting means for adjusting and setting each moving amount, a thread trimming mechanism for reciprocally moving a movable blade to perform a thread trimming operation, a thread trimming control cam that makes one rotation in one cycle together with the cloth feed cam, and the yarn. A thread-cutting prohibiting means for switching the operating state and the non-operating state of the cutting mechanism independently of the thread-cutting control cam; button detecting means for detecting the feed amount by the feed amount adjusting means to determine the type of the button; For the detection signal from the button detection means Zui and has a sewing machine control means for switching the operation state of the yarn switching prohibiting means and a non-operating state, the configuration with.

In a second aspect of the invention, the button detecting means in the first aspect of the invention comprises a predetermined sensor means for detecting the presence / absence of a movement amount in one of the two movement directions of the cloth feed mechanism.

Further, a third invention is a sewing mode in which the sewing machine control means in the first invention sewes a button having a predetermined number of holes in a half cycle based on a detection signal from the button detection means. The second sewing mode in which a button having the number of holes is sewn in the entire cycle is selected, and a mode determination means for selecting is selected.

[0012]

In the device having the structure according to the present invention, whether the button having a predetermined number of holes or the button having another number of holes is detected by the button detecting means for detecting the feed amount by the feed amount adjusting means. The sewing mode is determined based on the signal, and the corresponding sewing mode is executed by the mode determination means of the sewing machine control means.

When continuous sewing is performed without thread cutting operation for one cycle from the start of sewing to the end of sewing, such as a 4-hole button, the set value of the vertical feed amount by the feed amount adjusting means is "0". When it is detected by the button detection means that the state is not set, the four-hole sewing mode is executed by the mode determination means of the sewing machine control means based on the detection signal from the button detection means. In this case, the thread trimming prohibition means is always maintained in the non-operating state. At the start of sewing, the thread trimming control mechanism keeps the thread trimming mechanism in a non-operating state, that is, the thread trimming is not performed, and the thread trimming prohibiting means is activated at a predetermined timing immediately before the end of the sewing operation in the first half. The thread cutting mechanism is switched so that the thread cutting mechanism is held in a non-operating state. Therefore, thread cutting at the half cycle end point is avoided.

Thereafter, the thread trimming prohibiting means is switched to the non-operating state again at a predetermined timing, but at this time, the thread trimming control mechanism maintains the non-operating state, that is, the state in which the thread trimming is not performed. , Sewing is continued without thread trimming. Then, the thread is stopped at the end point of one cycle, the thread cutting control mechanism shifts the thread cutting mechanism to the operating state, and the thread cutting operation is performed at the timing when the last needle of one cycle is pulled out.

On the other hand, when the thread is trimmed by a half-cycle sewing operation and the sewing is finished like the two-hole button, the set value of the vertical feed amount by the feed amount adjusting means is "0". Is detected by the button detection means, and the two-hole sewing mode is executed by the mode determination means of the sewing machine control means based on the detection signal from the button detection means. In this case, the stop is performed at the end point of the half-split cycle, but at that time, the thread trimming prohibiting means is maintained in the non-operation. Therefore, the thread trimming control mechanism shifts the thread trimming mechanism to the operating state, and the thread trimming operation is performed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a cycle sewing machine with lock stitch buttons will be described in detail with reference to the drawings.
First, as shown in FIG. 1, the driving force from the drive motor 13 is transmitted to the sewing machine main body 12 mounted on the operation console 11. The drive motor 13 is composed of a servomotor or an electromotor which is electrically controlled by a sewing machine controller (motor sewing machine controller) 14, and stop control is performed by a constant number of stitches or a detection signal from a sensor. Therefore, the sewing machine main body 12 does not include an acceleration / deceleration device and a blocking frame. The start-up / stop of the sewing machine body 12 by the drive motor 13 is configured to be performed by a command from the foot pedal 15. Further, reference numeral 16 in the drawing denotes a two-hole mode prohibiting switch for prohibiting thread trimming after the end of a half cycle in a two-hole sewing mode described later.

Next, as shown in FIGS. 2 and 3, a main shaft 21 is arranged in the sewing machine main body 12 so as to extend substantially horizontally at the upper part of the sewing machine, and one end of the main shaft 21 is provided. Are fixed by screws so that the drive pulley 22 rotates integrally. The drive motor 13 described above is arranged directly below the drive pulley 22, and the output shaft of the drive motor 13 and the drive pulley 2 are disposed.
A transmission belt 23, such as a V-belt, is stretched between the two.

A needle bar 25 is attached to the opposite end of the main shaft 21 via a predetermined crank transmission mechanism 24, and a sewing needle 26 attached to the lower end of the needle bar 25.
Is configured to approach / separate with respect to the rotary hook 27 disposed directly below the needle plate. In addition, the rotary hook 27
The driving force from the main shaft 21 is transmitted to the lower shaft 28 connected to the above through a predetermined crank transmission mechanism 29.

Further, a cam shaft 32 is disposed substantially vertically in the middle of the main shaft 21 via a worm gear mechanism 31, and a cloth feed cam 33 is provided at the lower end of the cam shaft 32.
The thread trimming control cam 34 is fixed so as to be vertically overlapped. The worm gear mechanism 31 has a reduction ratio in which the cam shaft 32 makes one rotation with a predetermined number of stitches corresponding to one cycle from the start of sewing to the end of sewing.
Further, the cloth feed cam 33 reciprocates a cloth feed mechanism (described later) for holding a button and a material to be sewn in two orthogonal X and Y directions. The thread cutting mechanism is operated as described below.

A thread cutting cam 35 having a predetermined outer peripheral shape is screwed and fixed to the main shaft 21, and a thread cutting cam constituting a thread cutting control mechanism is provided in the vicinity of the thread cutting cam 35. The arm 36 is swingably provided on the machine frame of the sewing machine arm by a pin 37. The thread cutting cam arm 36
Are three arms 3 extending radially from the pin 37.
It has 6A, 36B and 36C. A roller 36a is rotatably provided at the tip of a first arm 36A that extends obliquely upward toward the thread cutting cam 35.
The roller 36a is arranged at a position where it can be pressed against the cam surface of the thread cutting cam 35. On the outer peripheral surface of the thread cutting cam 35, a cam surface that gives a predetermined thread cutting operation to the thread cutting cam arm 36 is formed.

The remaining two second arm 36B and third arm 36C of the thread cutting cam arm 36 are the pins 37 described above.
The roller 36b is rotatably provided at the tip of a second arm 36B that extends substantially right below the thread cutting cam 35 and extends substantially directly below the thread cutting cam 35. A swing end portion of a cam arm return arm 38, which will be described later, is configured to come into pressure contact with and separate from the roller 36b. Still another third arm 36C extends rearward away from the thread cutting cam 35, and a roller 36c is rotatably provided at the tip of the third arm 36C, and The upper end of the cut connecting rod 39 is rotatably attached.

The thread-cutting connecting rod 39 is provided on the thread-cutting cam arm 3.
6 extends downward from 6 and the lower end thereof is rotatably connected to a thread cutting link 41 having a substantially “L” shape. This thread cutting link 41 is
1 is fixed to a shaft 42 rotatably supported by a machine frame so as to extend in a direction orthogonal to 1 and pushes the thread cutting connecting rod 39 upward to one end of the thread cutting link 41. Thus, the tension spring 43 is stretched between the frame and the frame. A thread cutting connecting rod 44 extending toward the thread cutting mechanism (not shown) is rotatably connected to the other end of the thread cutting link 41. That is, the thread cutting operation transmitted through the thread cutting cam 35, the thread cutting cam arm 36, and the thread cutting connecting rod 39 described above is transmitted to the thread cutting mechanism by the thread cutting link 41.

The cam arm return arm 38 is composed of a plate member having a substantially V-shaped front surface which is swung by the thread cutting control cam 34. The thread cutting cam arm 36 is provided on the cam surface of the thread cutting cam 35.
Is rotatably attached by a pin 40 so as to contact and separate. One end side (upper end side) of the cam arm return arm 38 is, as described above, the roller 36b of the thread cutting cam arm 36.
Is arranged so as to be pressed into contact with and separated from each other, and is separated from the roller 36b of the thread cutting cam arm 36 by the upward pulling force of the tension spring 45 connected to the other end side of the cam arm return arm 38. It is energized. Also, this cam arm return arm 38
The upper end of the connecting link 46 is connected to the other end side (lower end side) of the connecting link 46, and the lower end of the connecting link 46 swings the thread cutting control arm 48B fixed to one end of the horizontal shaft 47. It is connected to the end. Further, on the other end side of the horizontal shaft 47,
The thread trimming control arm 48A is fixed, and the thread trimming control arm 4 is fixed.
A thread cutting control lever 51 is connected to the swing end of 8A via a connecting link 50.

The thread trimming control lever 51 is pivotally supported by a vertical shaft 52 in a substantially horizontal plane, and one end side of the thread trimming control lever 51, which is formed in a generally V-shaped plane, is provided. , The connecting link 50 on the side of the cam arm return arm 38 described above
Are linked to. The roller 53, which is rotatably provided on the other end side of the thread cutting control lever 51, is pressed against the outer peripheral cam surface of the thread cutting control cam 34 by the upward pulling force of the tension spring 45. Is configured to.

The thread trimming control cam 34 is supported substantially horizontally and is rotated once during one cycle of sewing operation in cooperation with the main shaft 21 as described above. The outer peripheral cam surface of the thread trimming control cam 34 has a non-operating surface 34a and a non-operating surface 34a.
Has two operating surfaces 34b, 34b recessed in a part thereof. The respective operating surfaces 34b, 34b are formed in a concave groove shape, and are arranged at positions substantially point-symmetric with respect to the rotary shaft 32. Then, as will be described later, the roller 5 of the thread trimming control lever 51 is provided within the operating surface 34b.
When 3 is dropped, the roller 36a of the thread cutting cam arm 36 in the thread cutting control mechanism is pressed against the outer peripheral cam surface of the thread cutting cam 35, and the roller 53 of the thread cutting control lever 51 causes the thread cutting control. The roller 36 a of the thread cutting cam arm 36 is configured to be separated from the cam surface of the thread cutting cam 35 when being maintained on the non-operating surface 34 a of the cam 34.

Further, the third arm 3 of the thread trimming cam arm 36.
Above the 6C, a thread-cutting auxiliary cam 55 that constitutes a thread-cutting prohibiting means is rotatably provided. This thread trimming auxiliary cam 5
Reference numeral 5 has a substantially fan-shaped outer peripheral cam surface, and the fan-shaped outer peripheral cam surface is configured to come into contact with and separate from the roller 36c of the thread cutting cam arm 36. Further, from the center of rotation of the thread cutting auxiliary cam 55, the operating arm 55a is
The tension spring 56 extends in a direction away from the thread cutting cam 35 and is hooked on the intermediate portion of the operating arm 55a.
The downward pulling force urges the cam surface of the thread cutting auxiliary cam 55 so as to separate from the roller 36c of the thread cutting cam arm 36.

Furthermore, an output shaft of a thread cutting prohibiting solenoid 57 as a thread cutting prohibiting means is connected to the extending end of the operating arm 55a from below. The output shaft of the thread trimming prohibiting solenoid 57 is connected to the thread trimming prohibiting solenoid 57.
It is provided so as to project upward when turning on and rotate the thread cutting auxiliary cam 55 against the biasing force of the tension spring 56. The operation of the thread-cutting prohibiting solenoid 57 causes the cam surface of the thread-cutting auxiliary cam 55 to come into pressure contact with the roller 36c of the thread-cutting cam arm 36, and at that time, the roller provided on the first arm 36A of the thread-cutting cam arm 36. 36a is held in a state of being separated from the cam surface of the thread cutting cam 35.

Next, the cloth feed mechanism and the feed amount adjusting means will be described. As shown in FIG. 4, first, the feed plate 80 of the cloth feed mechanism is slidably placed on the upper surface of the needle plate (not shown), and the rear end edge of the feed plate 80 is It is connected to the feed base 81 by screwing. The feed base 81 is movably supported inside a bed (not shown). A base portion 82a of the presser arm 82 is attached to the back side of the feed plate 80 so that the presser arm 82 can be opened and closed in the vertical direction. Above presser arm 8
A pair of cloth presser feet 82b, 82b for sandwiching the material to be sewn together with the feed plate 80 are attached to the distal end portion of 2, and are arranged so as to be vertically rotatable together with the presser arm 82.

The feed base 81 is configured to perform a predetermined cloth feed operation in two orthogonal directions, that is, the vertical direction (Y direction) and the horizontal direction (X direction) by the following feed link mechanism. ing. First, a first cam groove 33a and a second cam groove 33b having a required shape are formed on the back surface and the front surface of the cloth feed cam 33 described above. An X-direction (horizontal direction) feed arm 84 is rotatably supported by a fixed shaft 83 standing upright near the cloth feed cam 33. One arm 84a of the X-direction feed arm 84 is supported. A roller 84b that fits into the first cam groove 33a is attached to the tip of the roller. Further, the other arm 84 that is substantially L-shaped with the one arm 84a.
One swing arm 85a of the X-direction swing arm 85 is connected to c via a square piece 85b and an adjustment shaft 85c. The adjusting shaft 85c has a long hole 85 formed in the swing arm 85a.
It is loosely fitted in d so as to be reciprocally movable, and is fastened and fixed by a nut 85e. That is, this nut 85
By loosening e and moving the adjusting shaft 85c to the position, the lateral (X direction) feed amount is adjusted.
Further, the tip end of the swing arm 86f on the other side of the X-direction swing arm 85 is slidable in a guide long groove 81a formed at a required position of the feed base 81 via a square piece 81b. It is fitted.

On the other hand, reference numeral 91 in the figure denotes a Y-direction (longitudinal direction) feed arm rotatably attached to a fixed shaft 91c supported near the cloth feed cam 33, and one arm 9 thereof
A roller 91b that fits in the second cam groove 33b is provided at the tip of 1a. Further, reference numeral 93 in the figure denotes a Y-direction swing arm rotatably supported by a fixed shaft 94 existing in the machine frame above the cloth feed cam 33, and the swing arm 93 is provided.
A long hole 93b is formed in the center of a. Further, the feed base 81 is attached to the tip of the Y-direction swing arm 93.
Is equipped with a pin 95a that engages with the base end of the. Then, similarly to the connection structure of the X-direction swing arm 85 and the X-direction feed arm 84, the Y-direction swing arm 9 is connected by another adjusting shaft 95c.
3 and the Y-direction feed arm 91 are rotatably connected to each other. That is, the adjusting shaft 95c is loosely fitted in the long hole 93b formed in the swing arm 93a, and the nut 93
It is fastened and fixed by c. And this nut 9
By loosening 3c and reciprocally moving the adjusting shaft 95c, the feed amount in the vertical direction (Y direction) is adjusted.

Therefore, when the cloth feed cam 33 rotates, the roller 84b is guided by the first cam groove 33a and the Y-direction feed arm 8 is moved.
4 swings around the fixed shaft 83. As a result, the square piece 85b held at the lower end of the adjustment shaft 85c fixed to a desired position of the elongated hole 85d of the Y-direction swing arm 85 slides, and the X-direction swing arm 85 swings. The feed base 81 moves in the X direction via the square piece 81b.

On the other hand, the roller 91b is guided by the second cam groove 33b, and the Y-direction feed arm 91 swings around the fixed shaft 91c. As a result, similarly to the above, the Y-direction swing arm 93 swings around the fixed shaft 94, so that the feed base 81 moves in the Y direction by the pin 95a. In this way, the feed base 81 moves in the X direction and the Y direction in conjunction with the vertical movement of the needle, so that the feed plate 80 installed on the feed base 81 and holding the button and the workpiece is pressed down. The cloth pressing foot 82a of the arm 82 also moves in the X direction and the Y direction integrally with the feed base 81, and the sewing operation with buttons is performed in cooperation with the needle.

At this time, an adjusting lever 96 extending toward the side portion of the swing arm 93a is attached to the adjusting shaft 95c of the vertical (Y direction) feeding mechanism. The adjusting lever 96 is provided so as to be reciprocally movable in the longitudinal direction of the swing arm 93a while rotatably gripping the adjusting shaft 95 in the middle, and the adjusting lever 96 is moved to operate to adjust the adjusting lever 96. The shaft 95c is configured to reciprocate in the elongated hole 93b to adjust the feed amount in the vertical direction (Y direction).

A scale 97 indicating the moving position of the adjusting shaft 95c is engraved on the surface of the swing arm 93a. The scale 97 is provided corresponding to the feed amount in the vertical direction (Y direction). Therefore, by reading the current position of the adjustment shaft 95c from the scale 97, the feed amount in the vertical direction (Y direction) can be obtained. It is configured to be displayed. FIG. 4 shows a state in which the adjustment shaft 95c is in a position where the feed amount in the vertical direction (Y direction) is “0”. Then, the scales are displayed in the leftward direction in the drawing in the order of the feed amount from small to large.

Further, a position detecting plate 98a is attached to the adjusting shaft 95c so as to constitute the button detecting means 98. The position detecting plate 98a is fixed to the tip of an arm 98b extending toward the opposite side of the adjusting lever 96, and is configured to reciprocate integrally with the adjusting shaft 95c described above. In addition, the position detection plate 98a is arranged so as to closely face the position detection plate 98a.
A position sensor 98c is arranged as a sensor means for detecting the moving position of a. This position sensor 98c
As the optical axis, a light-reflecting type, a light-transmitting type or the like by magnetic means or the like is adopted, and the adjusting shaft 95c sets the feed amount in the vertical direction (Y direction) to “0”. It is arranged so as to detect whether or not it is at the position (illustrated position). The detection signal issued from the position sensor 98c, that is, the signal indicating whether or not the feed amount in the vertical direction (Y direction) is "0", indicates that the button to be sewn is 2
This is to detect whether it is one hole (two hole sewing mode when the vertical feed amount is "0") or four holes (four hole sewing mode when the vertical feed amount is not "0"). And is output to the control system described later.

Next, an example of the control system in the thread trimming control device used in the cycle sewing machine with buttons having the above-described structure will be described. The above-described sewing machine control device (motor sewing machine controller) 14 has an arithmetic processing unit (CPU) 61 as shown in FIG. 8, and a read-only memory (RO) is provided to the arithmetic processing unit 61.
M) 62, a random access memory (RAM) 63, an input / output device (I / O), etc. are connected. Further, the motor control means 64 provided in the arithmetic processing unit 61.
A detection signal from a motor speed detector (encoder) 65 attached to the motor rotation shaft so as to detect the rotation speed of the sewing machine drive motor 13 is applied to the input side of On the input side of the sewing machine control means 66, a detection signal from a sewing machine needle position detector 67 incorporated in the pulley so as to detect the position of the sewing needle 26, and a cycle origin detector 68 for notifying the timing of sewing start. From the pedal sensor 69 for notifying a command from the foot pedal 15, a detection signal from the position sensor 98c of the button detecting means 98, and a setting signal from the two-hole mode prohibiting switch 16 are applied. Has been done.

The sewing machine control means 66 is provided with a mode determination means 66a for selecting a sewing mode based on the above-mentioned input signals, and this mode determination means 66a.
Each sewing mode command (second sewing mode and first sewing mode) such as the four-hole sewing mode or the two-hole sewing mode selected by is output to the sewing machine control means 66. On the other hand, on the output side of the motor control means 64,
The sewing machine drive motor 13 is connected through the sewing machine motor driver circuit 71, and the thread cutting inhibition solenoid driver circuit 74 is provided on the output side of the sewing machine control means 66.
The above-mentioned thread-cutting prohibiting solenoid 57 is connected via the.

In the apparatus having the above structure, as shown in FIG. 9, first, the system is initialized immediately after the power is turned on (step 1), and then the button detecting means 98 is operated. It is checked whether the two-hole button detection signal from the position sensor 98c is turned on (step 2). If the two-hole button detection signal from the position sensor 98c of the button detecting means 98 is in the on state (Yes), the two-hole sewing mode is set (step 3), and the two-hole button detection signal is off. If it is in the state (No), the two-hole sewing mode is cleared (step 4). At this time, it is checked whether or not the start position of the cloth feed cam 33 is at the origin of the cycle (step 5), and if it is not the origin of the cycle, error processing is performed (step 6). Then, it is checked whether or not the foot pedal 15 is depressed by turning on / off the pedal sensor 69 (step 7). If the foot pedal 15 is depressed and the pedal sensor 69 is turned on, the work clamp is pressed. Is lowered (step 8), the cycle operation described below is executed (step 9), and the work clamp is raised at the end of sewing (step 10).

In the cycle operation of the above step 9, as shown in FIG. 10, first, after the needle number counter in the RAM 63 is cleared (step 11),
The motor rotation command is output to the motor control means 64 in the arithmetic processing unit 61 (step 12). The motor control means 64 receives a command from the sewing machine control means 66, determines the content of the command, and drives the motor driver circuit 71 to drive the motor so that the detection signal from the motor speed detector (encoder) 65 matches the command signal. A signal is given.
As a result, the sewing machine drive motor 13 is rotated and the main shaft 21
Is driven to rotate.

When the main shaft 21 is driven to rotate, the sewing machine needle position detector 67 moves the upper end position of the sewing needle 26 to 1
Each rotation is detected (step 13), and a pulsed needle-like signal as shown in FIGS. 11 (b) and 12 (b) is obtained. Then, each time the needle up signal from the sewing machine needle position detector 67 rises, the stitch number counter is incremented (step 14 in FIG. 10). At this time, by checking the two-hole sewing mode (step 1 in FIG.
5) When it is judged that the sewing mode is the 4-hole sewing mode instead of the 2-hole sewing mode, that is, 1 from the start of sewing to the end of sewing.
When the cycle is continuously sewn without the thread trimming operation (in the case of FIG. 11), first, the thread trimming prohibiting solenoid 57 is operated as shown in FIG.
Non-operating state as in (a) (OFF state in FIG. 11 (c))
Maintained at. Then, at the start of the operation, as shown in FIG. 6B, the roller 53 of the thread cutting control lever 51 moves the thread cutting control cam 3
4 is on the non-moving surface 34a, the cam arm return arm 38
However, the state in which the thread cutting cam arm 36 is pressed against the roller 36b of the thread cutting cam arm 36 as shown in FIG.
The roller 36 a of No. 6 is held at a position separated from the cam surface of the thread cutting cam 35. Therefore, sewing is started without transmitting the thread cutting information from the thread cutting cam 35.

Then, a predetermined timing immediately before the end of the first half half-division cycle, for example, the stitch number counter is (n / 2)
When -3 (n is the number of cycle needles) is reached (step 16 in FIG. 10), the thread trimming prohibiting solenoid 57 is switched to the operating state (on state in FIG. 11C) as shown in FIG. 7 (FIG. 11). Step 10 of 10). As a result, the thread cutting auxiliary cam 55 is rotated so as to come into pressure contact with the roller 36c of the thread cutting cam arm 36, and the roller 36a of the thread cutting cam arm 36 is rotated by the binding force of the thread cutting auxiliary cam 55. Is held at a position separated from the cam surface. Therefore, as shown in FIG. 6B, the roller 53 of the thread cutting control lever 51, which was on the non-operating surface 34a of the thread cutting control cam 34, is changed to the operating surface 34b of the thread cutting control cam 34 as shown in FIG. 5B. Move to fall inside,
The thread cutting cam 35 at the position shown in FIG. 5A from the position where the cam arm return arm 38 separates the thread cutting cam arm 36 from the cam surface of the thread cutting cam 35 at the position shown in FIG. 6A. Even if the thread cutting cam arm 36 is moved to a position where it comes into contact with the cam surface of FIG.
The roller 36a of the thread cutting cam arm 36 is
5 is held at a position separated from the cam surface. Therefore, the sewing is continued without transmitting the thread trimming information from the thread trimming cam 35, and the thread trimming operation at the end point of the half-split cycle is avoided.

After that, at a predetermined timing, for example, when the number of stitches counter reaches (n / 2) +2 (step 18 in FIG. 10), the thread-cutting prohibiting solenoid 57 causes the thread-cutting prohibiting solenoid 57 to return to FIG.
Non-operating state as in (a) (OFF state in FIG. 11 (c))
(Step 19 in FIG. 10), but at this time, the roller 53 of the thread trimming control lever 51 causes the thread trimming control cam 3 to move.
Since the cam arm return arm 38 is pressed against the non-operating surface 34a of No. 4, the cam arm return arm 38 is maintained at a position where the thread cutting cam arm 36 is separated from the cam surface of the thread cutting cam 35 as shown in FIG. 6A. . Therefore, the thread trimming information from the thread trimming cam 35 is not transmitted,
As shown in FIG. 11A, the sewing without thread cutting is continued for one cycle.

On the other hand, in step 15 of FIG. 10, the two-hole sewing mode is determined, and the two-hole mode prohibiting switch 16
Is off and the 2-hole sewing mode is not prohibited (step 20 in FIG. 10), one cycle from the start of sewing to the end of sewing is divided into half, and the first half division cycle is completed. At that point, thread trimming is performed and sewing is completed. In this case, when the number of stitches counter reaches n / 2 (step 21 in FIG. 10), a stop command is issued to the sewing machine drive motor 13 (step 22 in FIG. 10) and the sewing operation is ended. (See FIG. 12 (a)). This completes the sewing cycle with half the number of stitches.

Further, in the case of this two hole sewing mode, 2
When the three-hole mode prohibition switch 16 is in the ON state,
If it is determined in step 20 of 0 that the 2-hole sewing mode is prohibited, normal sewing is executed in the same manner as in the 4-hole sewing mode, and the 2-hole button is sewn with the total number of stitches. To be done.

As described above, in the apparatus of this embodiment, the sewing mode for each button type is automatically switched as appropriate in association with the movement position of the vertical feed lever of the cloth feed mechanism which is operated corresponding to the buttons having different numbers of holes. That is, the two-hole button 3 as shown in FIG. 13 (a) is sewn in a half cycle, and the four-hole button 1 as shown in FIG. 13 (b) is sewn in one cycle from the start to the end of sewing. The case where four holes are continuously sewn without thread cutting is automatically selected.

Although the invention made by the present inventor has been specifically described based on the embodiments, the 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 drive timing of the thread trimming prohibition solenoid as the thread trimming prohibition means is counted by the number of stitches. However, a predetermined sensor is arranged corresponding to the point at which the thread trimming prohibition solenoid is to be turned on or off. It is also possible to drive the thread cutting prohibiting solenoid based on the detection signals of these sensors.

In addition to the above-described embodiment, the thread-cutting prohibiting solenoid as the thread-cutting means is configured to directly move the roller 36c of the thread-cutting cam arm 36 and the like, and one end of the thread-cutting link 41. Of the cam arm return arm 38 (connecting link 46
6) and the cam arm return arm 38 is rotated to move the thread cutting connecting rod 39 downward, or A configuration in which the roller 53 of the thread trimming control lever 51 temporarily blocks the clockwise rotation of the thread trimming control lever 51 in FIG. 2 immediately before the roller 53 of the thread trimming control cam 34 faces the operating surface 34b of the thread trimming control cam 34, etc. It is also possible to provide a thread cutting prohibiting means at every portion from the control lever 51 to the thread cutting mechanism, and the same operational effect as that of the above-mentioned embodiment is brought.

Further, in the above embodiment, the button detecting means 9
8 is configured to detect the two-hole sewing mode when the position sensor 98c of No. 8 is on.
It is also possible to detect the two-hole sewing mode when c is off. Further, the present invention can not only discriminate between the two-hole button and the four-hole button as in the above-described embodiment but also discriminate between buttons having various numbers of holes. Further, the present invention is applicable to a cycle sewing machine. Without being limited
The present invention is applicable to button sewing machines having various configurations.

[0049]

As described above, the button discriminating apparatus of the button sewing machine according to the present invention operates in association with the feed amount adjusting means of the cloth feeding mechanism which operates corresponding to the buttons having different numbers of holes, for each button type. Since the sewing mode is automatically switched and each sewing mode is executed,
It is possible to reliably change the sewing mode for a plurality of types of buttons with different numbers of holes by a simple operation without requiring the troublesome and dirty work as in the past, and to improve the reliability of the button sewing machine. it can.

[Brief description of drawings]

FIG. 1 is an external perspective view showing the overall structure of a button-attached cycle sewing machine according to an embodiment of the present invention.

FIG. 2 is a perspective view of relevant parts showing the internal structure of the sewing machine body shown in FIG.

3 is an explanatory view seen from an arrow A showing the internal structure of the sewing machine body shown in FIG. 2. FIG.

FIG. 4 is a perspective view of an essential part showing a cloth feeding mechanism provided in the sewing machine main body shown in FIG. 1.

FIG. 5 is an explanatory view showing the structure of a thread cutting mechanism, (a)
FIG. 4A is a front explanatory view of the thread cutting cam mechanism, and FIG.

6A and 6B are explanatory views showing a moving state of the structure of the thread cutting mechanism, FIG. 6A is a front explanatory view of the thread cutting cam mechanism, and FIG. 6B is a plan explanatory view of the control cam mechanism.

FIG. 7 is an explanatory front view showing a working state of a thread cutting prohibiting actuator with respect to the thread cutting mechanism.

FIG. 8 is a block diagram showing an example of a control system of the button discrimination device of the sewing machine according to the present invention.

FIG. 9 is a flowchart showing an outline of an example of a control procedure of the button discrimination device of the sewing machine according to the present invention.

FIG. 10 is a flowchart showing a cycle sewing operation in an example of a control procedure of the button determining device of the sewing machine according to the present invention.

FIG. 11 is a timing chart showing a four-hole sewing mode in an example of a control procedure of the button discrimination device of the sewing machine according to the present invention.

FIG. 12 is a timing chart showing a two-hole sewing mode in an example of a control procedure of the button distinguishing device of the sewing machine according to the present invention.

13A and 13B are diagrams showing buttons, and FIG. 13A is an explanatory plan view showing a sewing state of a two-hole button, and FIG. 13B is an explanatory plan view showing a sewing state of a four-hole button. Is.

14A and 14B show a conventional thread cutting control cam replacement state, wherein FIG. 14A is an external perspective view and FIG. 14B is a plan view.

[Explanation of symbols]

 13 sewing machine drive motor 14 sewing machine control device (motor sewing machine controller) 15 foot pedal 16 two-hole mode prohibition switch 21 spindle 34 thread trimming control cam 35 thread trimming cam 36 thread trimming cam arm 38 cam arm return arm 51 thread trimming control lever 55 thread trimming auxiliary cam 57 thread trimming prohibition solenoid 98 button detecting means 98c position sensor

Claims (3)

[Claims] 1. A cloth feed cam that rotates once with a predetermined number of stitches in conjunction with a main shaft to perform a predetermined cloth feed operation, and swings following the cam surface of the cloth feed cam, A cloth feed mechanism that moves a required amount in two vertical and horizontal directions that are perpendicular to each other while gripping a sewn item; feed amount adjusting means that adjusts and sets each vertical and horizontal movement amount of the cloth feed mechanism; A thread trimming mechanism that moves the blade back and forth to perform a thread trimming operation, a thread trimming control cam that makes one rotation together with the cloth feed cam in one cycle, and a thread trimming control cam that determines whether the thread trimming mechanism is operating or not. From the thread feed amount adjusting means, a button detecting means for detecting the feed amount by the feed amount adjusting means to determine the type of the button, and a thread trimming inhibiting means based on a detection signal from the button detecting means. Operating and non-operating states Button sewing machine buttons discriminating apparatus characterized by comprising: a sewing machine control means for switching the. 2. The button discriminating apparatus for a button sewing machine according to claim 1, wherein the button detecting means is a predetermined sensor means for detecting the presence or absence of a movement amount in one of the two movement directions of the cloth feeding mechanism. A button discriminating device for a sewing machine with buttons, which is configured. 3. The button discriminating apparatus for the button sewing machine according to claim 1, wherein the sewing machine control means sew a button having a predetermined number of holes in a half cycle based on a detection signal from the button detection means. A button discriminating apparatus for a button sewing machine, comprising a mode discriminating means for selecting one sewing mode and a second sewing mode in which buttons having other numbers of holes are sewn in all cycles.