JPS595319B2 - Sewing machine control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a sewing machine having two needles arranged at a predetermined distance on the left and right sides, and in particular to a device for automatically performing a predetermined corner stitch by the sewing machine. It is related to.

Conventionally, when performing corner stitching on a corner of fabric using a two-needle sewing machine, the sewing machine was stopped before the corner and then a lever was operated to cause the needle on the inside of the corner to interlock with the main shaft of the sewing machine. The sewing machine is operated at a low speed by lightly pressing the pedal forward, and after the worker has sewn a predetermined number of stitches using the outer needle, the sewing machine is turned off (
Stop at the (outside) lower position, raise the presser foot, turn the cloth at a specified angle around the outside needle, and then lightly depress the pedal again to move the outside needle to the position corresponding to the inside corner for the specified number of stitches. After forming the stitches, the sewing machine was stopped by releasing the pedal, and the inner needle was linked to the main shaft by returning the lever, etc., and then the stitches were formed using a normal double needle. This work requires a high degree of skill, and there are drawbacks such as not being able to stop the inner needle in the specified position due to incorrect pedal operation, resulting in excessive stitching and deteriorating the quality of the product.It is also complicated and reduces work efficiency. There were drawbacks such as a decrease in

The present invention aims to eliminate the above-mentioned conventional drawbacks.

An embodiment of the present invention will be described with reference to the drawings. Behind the main shaft (not shown), which is placed on a table and rotatably supported on the machine frame of the sewing machine head, there is an electromagnetic clutch motor (not shown) and a stopper. The belt 2 is passed around the pulley 3 to rotate the main shaft in conjunction with the electromagnetic clutch motor.
is fixed, and a needle position detection device 4 is provided at the rear end of the main shaft to detect the main shaft rotation angle corresponding to the vertical position of the needle bar, which moves up and down once for each rotation of the main shaft.

The needle position detection device 4 is designed to detect a rotation angle that is slightly behind the top dead center of the needle bar.

An electromagnetic clutch motor intermittently opens and closes a clutch within the motor in conjunction with the energization and deenergization of an electromagnet controlled by a control circuit (not shown), and rotates the motor drive shaft at a set rotation speed proportional to the amount of pedal depression. It has a configuration in which the speed is controlled by a circuit so that it rotates.

Needle bars 6a and 6b with needles 5a and 5b fixed to the lower ends of the troughs are arranged on the left and right sides perpendicular to the cloth feeding direction, and are supported on the jaw part 7 so as to be movable up and down in synchronization with the main shaft. , the known pause mechanism 8, which normally receives an acting force that maintains it in an inactive state, enters an active state, so that the left and right needle bars 6a,
Interlocking of the force of 6b with the main shaft is appropriately interrupted so that it can be maintained in a resting state before the top dead center.

One end of a support shaft 9 rotatably supported on the machine frame 1 about a fixed straight line parallel to the cloth feeding direction is connected to the pause mechanism 8, and the other end is the base of a lever 10 that is disposed toward the tip jaw 7. When the lever 10 is rotated clockwise in Figure 1, the needle bar 6a on the left side in Figure 1 is fixed, and when the lever 10 is rotated counterclockwise, the lever 10 is rotated in one direction. The pause mechanism 8 acts to put the needle bar 6b on the right side of the figure in a rest state, and when the needle bar 6b on the right side of the figure is placed in an intermediate position between clockwise and counterclockwise directions, it is put in a rest state so that the left and right needle bars 6a and 6b are put in an operating state. This is so as to render mechanism 8 inoperative.

A cam plate 16 with a protruding portion 15 formed in the center of the tip is fixed in order to release the connecting portion of the support shaft 9 with the stop mechanism 8, and is rotated on a shaft 17 parallel to the support shaft 9. The distal end of the engaging body 19 is formed into a bifurcated shape, and one end of the engaging body 19 is formed into a forked shape, and receives a force acting to the left in FIGS. Bent locking part 20
When the lever 10 is in the intermediate position, the inner end surface of the engaging portion 20 is engaged with the protrusion 15 of the cam plate 16, and the coil spring 18 When the engaging body 19 is maintained at the rotation position shown in FIG. 2A against the acting force of
b, the engaging body 19 is rotated to the left in FIG. 2A by the force of the winding spring 18, and the cam plate 16 is moved to the rotating position in FIG. 2B against the force of the stop mechanism 8. maintain.

In addition, the support portion 25 that protrudes toward the side force of the engaging body 19 fixes the tip of the plunger 23 of the electromagnet 22 that acts by suppressing the operating rod 11 arranged in front of the machine frame, and when the electromagnet 22 acts, the plunger 23 The engaging part 20 attracts and winds the engaging body 19 against the acting force of the spring 18.
2B until it engages with the protrusion 15 of FIG. 2B.

In addition, a thread tension regulator 24 provided on the upper thread path of the sewing machine jaw 7
The needle thread tension can be manually adjusted, and the electromagnetic device is arranged in relation to an electromagnetic device (not shown) provided inside the head machine frame, and the electromagnetic device acts to increase the needle thread tension when activated. .

Although not shown, the hook installed below the throat plate is
As shown at 445, a bobbin case having an elastic body for absorbing the bobbin thread is attached.

In front of the sewing machine head on the top of the table 1, in order to set the number of square wire stitches on the wooden nail, there are a needle selection button 12 with a total circle in three rows vertically and horizontally that controls the electric circuit described later, and a square wire button 12. A switch button group is arranged, including a single manual button 13 that allows the number of stitches to be set as desired, and a single LOCK button 14 that holds the electric circuit set by the selection operation of these buttons in the set state, The LOCK button 14 is locked in the pressed position by a single pressing operation, and is released by a second pressing operation.

Next, to explain the electric circuit of this embodiment, the terminal V
A logical H level voltage is applied to c when the power is turned on, G is a known Nant gate, ■ is an inverter, OR is an exclusive OR gate, and FF is R87971707.
1 circuit, ff is 979777071 circuits.

[) Stitch number setting circuit (Fig. 4) A, 5W-i, and SW are open/close switches that are closed by pressing the trough of the needle selection button 12, and are set sequentially from one stitch to nine stitches. Yes, MANU, S
WI 3 is an open/close switch that closes when the manual button 13 is pressed, and LOCK and SW are open/close switches that close when the LOCK button 14 is pressed.

D. C is a decoder having round input parts a-i connected to a, SW"i, and SW, and when an L level input is generated from a switch connected to a part of each input part, it corresponds to that switch. The numerical value of the number of stitches obtained is converted into a binary code, and inverted outputs are generated at the four output sections A to D.

B and R are A to D whose inputs are the λ to F outputs of the decoder DC.
It is a bistable latch having an input part, and when the input of the latch input part j falls from H to L, an output which is an inversion of the A to D inputs is generated and held at Qa=Qd, and Q a
-Q d output is inverted by 121 to 24 and connected to U, V, W, and X in FIG.

P and S are oscillators that instantaneously generate an H signal when the power is turned on.The instantaneous signal makes the transistor Tr1 conductive, and instantaneously sets the set input of FF1 to L, and the output of G5. B as L-H-L.

Input a rising signal to the latch input section j of R0 11) Sewing machine control circuit (Fig. 5) L and SW are open/close switches that close when the pedal is depressed before the pedal, and D and SW are closed when the pedal is depressed after the pedal is depressed. The opening/closing switches Re and SW are opening/closing switches that become closed when the operating rod 11 is pressed.

N and P are detection switches provided in the needle position detection device 4, which detect the upper and lower positions of the needle separately and generate H level signals separately at each position. (not) is the time to capture the needle thread loop.

C and T are counters, which input the upper position signals from N and P, count them, and generate binary code outputs at output sections A to D.

The outputs of this A-D are input to OR1 to OR4 separately, and the above-mentioned U, V, W,
Signals from X are input separately.

U and SW are normally closed switches that open when the lever 10 is rotated from the intermediate position to one side or the other side,
G and R are reset circuits, which generate an L output from the time the power is turned on until the first front pedal depression operation, and after the first pedal front depression operation becomes the H output, the output is held until the power is cut off.

When the outputs of OR1 to OR4 all become H and the G7 output becomes L, ff1 becomes a Q output when the clock input from 114 becomes H, and becomes a Q output section, and the G8 output becomes H and becomes 1.
When the input from 15 becomes H, each output is inverted.

The Q output of ff2ff1 is used as a clock input, and the output is inverted every time a rising signal is input to the input.

O81 and 082 are one-shot multi-by-break, and when there is a trigger input, they generate output for the set time of △ti and △t2, respectively. In particular, △t2 causes the needle to move once when the sewing machine is driven at a predetermined low speed. This is the time it takes to move up and down.

Re, SQL is the solenoid of the electromagnetic device 22,
When 018 becomes an H output, it is energized and the electromagnetic device is brought into operation.

T and SQL are solenoids of an electromagnetic device associated with the thread tension regulator 24, and are energized to operate the electromagnetic device when 117 becomes an H output.

S. C is an upper limit speed setting circuit that sets the driving speed of the electromagnetic clutch motor, and normally the speed is controlled to be proportional to the amount of forward depression of the pedal, but transistor T
When r2 is turned on, it is controlled to drive at a predetermined low speed.

M. D is a drive control circuit for electrically driving or stopping the motor, and controls the motor so that it is driven when G19 becomes an output, and stopped when it becomes an output H.

Further, U and S are upper stop command circuits which generate a command signal so that the sewing machine stops at the needle upper position when G20 becomes the L output.

The present invention has the above structure, and its operation will be explained next.

■) Setting the number of stitches When the power is turned on from the state shown in Figures 4 and 5, terminal V
clCH level voltage is applied, and in the needle installation circuit shown in Fig. 4, an instantaneous H signal is generated from P and S, transistor Tri becomes conductive, the set input of FF1 becomes L, and the FF1 output becomes L. This L output turns G3 to H.

a. SW~i, SW is open, A~D of C
The output becomes H, and MANU and SW are open, so G1
The input becomes H, and the output becomes H, and the H inverted by 1 becomes G2's manual power, and G2 becomes L.

Therefore, since G4 becomes H, G5 becomes an output H due to an instantaneous input due to conduction of the transistor Trl, and then immediately becomes an L output.

B and R are G5 output H- with G5 output as latch human power J
A by falling to L.

□- QatQb is the output that inverts the states of B, C, and D inputs.
Occurs at t■c and Qd.

Therefore, when corner stitching is to be performed at this time, the number of stitches can be arbitrarily selected by operating the pedal.

In order to set the number of stitches for corner stitching, press the needle selection button 12, for example, a rotating needle selection button, and make d, SW a closed path. The output of D becomes H, H, L, H, and 02 becomes an H output.

H of G2 becomes G4 human power and 12 is L output, I
2 output is delayed by capacitor C and then operates to become G2 human power and becomes the reset input for FF1.
1 to output H.

U because the lever 10 is in the middle position. SW (Fig. 5) is closed, and I5. Lead wire Y via I6゜I20
becomes H, and G4 human power is Y, G2, G3's H and 12
G5 instantaneously becomes an L output due to the delayed H, and G5 becomes an H output for a short time and then becomes a mustard output.

At the falling edge, B and R become the inverted outputs of the A, B, C, and D inputs, H, H, L, and H, or become L, H.

Hold L as Qa, ζb, ζc, and Qd outputs.

When C05W is closed by pressing another needle selection button, for example the needle selection button 12 for three stitches, to change the number of stitches, D,
Output beams of C, L, H.

becomes H, G2 becomes H output and outputs 04 for a short time as before, the output of G5 becomes L -H- and becomes B
, R is A, B, C, D input glue.

The outputs H, H, L, and L obtained by inverting L, H, and H are Qa and Q
It appears in b, Qc, and Qd.

Press the LOCK button 14 to set it to the suppression position, and
C.K.

'When SW is closed, I3 becomes H, and G3 has I
3. H of FF1 is input and output, and G4 is held at H output.

Therefore, press the LOCK button 14 again to return to LOCK.

Unless the SW is opened, press the manual button 13 or another needle selection button, for example, the rotating needle selection button 12, and close the SW.D.

The A, B, C, and D outputs of C become H, H, L, H, and G2
Even if becomes H, G4 does not change due to the input from G3, and the HL signal is not input to the latch j of B and H, so the outputs of B and H do not change.

In addition, when turning on the power after pressing the LOCK button 14 and setting the LOCK and SW to the closed circuit state before turning on the power, LOCK and SW are closed, so 13 is an H output, but due to the L output of FF1. G3 becomes H.

Then, as in the explanation when the power is turned on, G2 becomes L and G4 becomes an H output, and while transistor Tr1 is conductive, G2 becomes L and G4 becomes H output.
5 output becomes H and then becomes B.

All R outputs are L, and the number of corner stitches is arbitrary.

From this state, if you press the needle selection button 12, for example the needle selection button 12 for nine stitches, to close i and sW, the output of C becomes H, H, L, and 02 becomes H, and the same as above. 12 is delayed by capacitor C and becomes an output, and during that delay 04 becomes L, and the output of I2 becomes FF.
1 output is set to H, G4 is set to H, G5 is set to HL, and B and R outputs are set to H, L, L.

It is held at H.

■) Double needle electrical stitching When the power is turned on and the pedal is pressed forward, G will be generated.

When R is set to H output, L and SW are closed to set 19 output to H, I9 and G17 H are input to G19 and the output is H, and M and D are set to drive the electromagnetic clutch motor. The motor is driven at a speed corresponding to the amount of pedal depression under the control of S and C, and the sewing machine performs normal stitch formation using two needles.

When the pedal is released and returns to the intermediate position, L and SW are closed, I9 output becomes L, G19 becomes H output, and M,
D controls the motor to stop when the needle down position signal is generated.

(2) - U from the stitch number setting circuit (FIG. 4) which is set to three stitches as described above by operating the wooden nail square wire needle selection button 12.

V, W, X [L, L, H, H are input.

When the lever 10 is rotated clockwise in FIG. 1 from the intermediate position, the needle bar 6a is held in a resting state by the resting mechanism 8 when the needle bar 6a next rises to the upper position, and the cam plate 16 is rotated clockwise in FIG. 2A. The engaging portion 20 of the engaging body 19 is rotated in the direction, and the engaging portion 20 of the engaging body 19 is detached from the protrusion 15 , and the engaging body 19 is rotated in the opposite direction by the action force of the winding spring 18
The notch 2 of the cam plate 16 is rotated counterclockwise in FIG. 2A.
1b, and the USW is m.

I5 beam and I6 become H output, and along with the H output of OR, G
The 11 output is set to L and the 113 output is set to H.

The H output of I6 becomes G13, G14, and FF2 input, and G13 becomes I6. The H output of I8 causes the FF2 output to become L, and the G14 output to become H.

Since the FF2 output does not change unless the USW is opened and the ■6 output becomes L, G14 is held at the H output.

When the pedal is pressed forward and the SW is closed, ■9 becomes the output H, and with G19 as the output, M and D control the motors to be in the driving state, and at this time, the 113 output is H. , U, V.

Since W, Control.

The main shaft of the sewing machine rotates to perform single needle sewing using the needle bar 6b, and the upper position signal H is generated from N and P, which becomes the clock input for C and T, and the upper position signal of the three-tube mouth becomes the clock input. When C, T's A, B, C.

Since the D output becomes H, H, L, L, OR1 to OR4 are H.
output, G7 as output, 114 as output H,
The output of ff1 is inverted and becomes a Q output, and becomes an output H.

For Q output, set G12 to H output, clear C and T, and
For the output H, invert the ff2 output, set the Q output to H, and set 017 to output, and continue to press the pedal forward.
Even if the SW is closed, G19 becomes an H output, and M and D stop the motors when the needle down position signal is generated.

At this time, the Q output H of H9ff1 of 113 is input and output to G12, and the clear terminal of C0T becomes an L input, and even if the upper position signal is input from N and P to the clock input of C and T, it will not be counted. is not performed and the A, B, C, and D outputs do not change.

Turn the cloth at a predetermined angle around the needle 5b, press the pedal forward again, and close the SW. ■9 becomes H output, 015 instantly becomes L output, G8 becomes H, 115
becomes L, resets ff1, inverts its output, sets Q output to H, Q output to L, and sets G17 to H output.■
It outputs 019 along with H of 9, and M.

D controls the motor to be driven at a predetermined low speed set by S and C, and the sewing machine forms a seam at the outer corner with a single needle.

Also, at the beginning of sewing that -stitch, when the Q output of ff1 falls, the 010 output becomes instantaneous and O8
2 is triggered, △t2 is output, 117 is set to H output, T and SQL are energized, and the electromagnetic device installed in the machine frame of the sewing machine jaw 7 is activated, and the needle moves from the lower position. It acts to strengthen the needle thread tension caused by the quantity adjusting device 24 which rises and moves up and down once.

This increases the needle thread tension for the first stitch from the outer corner, and the needle thread, which is pulled up when the thread take-up is raised, pays out the bobbin thread to the stitch knot point at the needle entry point, forming a proper stitch. .

The upper position signal from N and P becomes the clock input for C and T, and when the upper position signal of the three cylinders is input, that is, when the position corresponding to the inner corner is reached, OR1 to OR4 are output in the same way as above. The output becomes H, causing G7 to be output, the output of 114 becomes H, inverting the output of ff1, the Q output increases, the Q output becomes H, and the Q output becomes H, causing the Q output of ff2 to become L.

The Q output of ff2 triggers O81 to produce the interval output of △t1, sets 018 to H, and energizes Re and SQL.
The plunger 23 of the electromagnetic device 22 is pulled to the right in FIG.
The cam plate 16 rotates in the clockwise direction in FIG. 2A due to the acting force of the stop mechanism 8, and the engaging portion 20 is engaged with the tip surface of the protrusion 15 and maintained (see FIG. 2B). figure).

Therefore, the lever 10 also returns to the intermediate position, U and SW close, and the pause mechanism 8 also becomes inactive, so that the needle bar 6a, which had been at rest, is linked to the main shaft and can move up and down in synchronization with the external force 6b. becomes.

Until the USW is closed, the Q output of ffl causes the output of 017 to become H and the output of 019.Also, since the transistor Tr2 is conductive, the motor is driven at low speed, and the USW is closed. When the 113 output becomes L, G12 is set to H output and CT is cleared, the G8 output becomes H, the 115 output becomes L, and the Q output of ffl becomes H, and the Q output of ff2 is inverted by the output H of ff1. As a result, 017 becomes an output H and 019 is output, and MD continues to control the motor to the driving state, but
The G9 output becomes H, the 116 output becomes L, the transistor Tr2 becomes non-conductive, and the SC cancels the predetermined low speed setting and controls the speed so that the motor is driven at a speed corresponding to the amount of pedal depression. .

Therefore, the sewing machine shifts from a single needle line to a double needle line without stopping, forms stitches continuously, and performs double needle stitching at a speed corresponding to the amount of depression of the pedal.

When the Q output of ff2 is H, that is, when the operating rod 11 is operated to close Re5W until the single needle line is completed by the return of the stop lever 10 at the outer corner to the intermediate position by the single needle, 111 output is set to H, G16 momentarily becomes an output and becomes the other input of 081, but since the input from the Q output of ff2 is kept at H, the output of O81 does not change, and GlB is in the output state. As it is, Re5QL is not energized and the electromagnetic device cannot operate.

In this embodiment, a sewing machine that uses a counter to form a predetermined number of corner stitches has been described, but a timer circuit may be used to drive the sewing machine for a predetermined period of time to form a predetermined corner stitch. .

In addition, in this embodiment, the needle moves up and down to form only stitches, but the needle moves up and down and in the lowered position, it passes through the fabric and synchronizes with the feed dog in the fabric feeding direction. It may be carried out in a so-called vertical feed sewing machine or a top feed sewing machine that moves back and forth to transfer the cloth.

As described above, according to the present invention, the sewing machine is started by operating the operating means such as a lever to set the needle bar mechanism to a single needle line, and then depressing the pedal forward to start the sewing machine, and to perform a predetermined number of stitches or a predetermined time with the outer needle. After forming the seam, the sewing machine automatically stops, the fabric is rotated, and the predetermined number of stitches or stitches are moved by the outer needle to the position corresponding to the inner angle in conjunction with the subsequent forward pedal operation. After forming a stitch for a predetermined period of time, the operating means is automatically returned and the needle bar mechanism is used for double needle stitching to form stitches continuously, so the operator can control the amount of pedal depression. The work can be done without being careful, the work does not require skill, the work is easy and simple, and the work does not require forced movements such as stepping on the pedal backwards (heel stepping), causing fatigue to the worker. This has the effect of improving work efficiency, as well as being able to reliably stop the sewing machine at a predetermined seam position, and in particular, allowing the worker to start the sewing machine with both hands on the fabric at the beginning of the sewing line. This has the effect of reliably guiding the cloth in the feeding direction, finishing the seams neatly, and improving the quality of sewn products.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the sewing machine main body of this embodiment, Fig. 2A is an explanatory diagram of the locking mechanism in the double needle state, Fig. 2B is an explanatory diagram of the locking mechanism in the single needle state, and Fig. 3 is an explanatory diagram of the locking mechanism in the single needle state. FIG. 4 is a perspective view of the locking mechanism, FIG. 4 is a stitch count setting circuit, FIG. 5 is a sewing machine control circuit, FIG. 6 is a time chart of the stitch count setting circuit, and FIG. 7 is a time chart of the sewing machine control circuit. In the figure, LSW is a pedal, SC is a drive circuit, 10,
USW is an operating means, and Re5OL is an actuating means.

Claims (1)

[Scope of Claims] 1. A double-needle line in which a stitch is formed by two needles arranged intersectingly in the fabric feeding direction while maintaining an interval, and a single-needle line in which a stitch is formed with one of the needles inoperative. A sewing machine that enables one-way operation, a driving body electrically driven or stopped and connected to the sewing machine, a pedal LSW that can be operated in one direction from a neutral position and generates a start signal in relation to the initial operation, and Interlockingly, the sewing machine moves to a first position where the sewing machine has a single needle line and generates an operation signal and is locked, and when the lock in the first position is released, it returns and moves to a second position where the sewing machine has a double needle line. an actuating means 10, USW, and an actuating means 22, actuated by an actuation signal, to unlock the first position of the actuating means. Re, SQL, a drive circuit that sets the drive speed of the prime mover in proportion to the amount of one-way operation of the pedal and stops the prime mover in relation to a stop signal, and the amount of one-way operation of the pedal that operates based on a constant speed signal. a constant speed circuit associated with the drive circuit so as to keep the drive speed of the prime mover constant regardless of the speed of the drive; a setting circuit that generates an action signal; and a setting circuit that generates an operation signal and a constant speed signal in connection with a starting signal from the pedal after the operation signal is generated by one-way operation of the operating means, and then an action signal is generated from the setting circuit. Generates a stop signal to stop the prime mover in connection with the operation of the motor, then generates an operation signal and a constant speed signal in connection with a start signal caused by a subsequent pedal re-operation, and then generates an operation signal and a constant speed signal in connection with an action signal from the setting circuit. an electric circuit for generating an actuation signal and releasing the lock of the operating means in the first position.