JPS6047872B2 - Sewing machine control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides stitch formation for a predetermined number of stitches (number of stitches) or for a predetermined period of time (stitch number) started in connection with the operation of an operating member such as a pedal.
In a sewing machine that stops after forming stitches for a predetermined number of stitches (that is, the time required to form a predetermined number of stitches), a setting means for setting the number of stitches or the time to a predetermined value and a setting of the setting means are maintained. The present invention relates to a control device for a sewing machine having a holding means that makes it unalterable.

Conventionally, in the above-mentioned sewing machine, for example, a two-needle sewing machine, in order to perform corner stitching on the corners of cloth, the inner needle is put into a rest state, and then the sewing machine is started by operating a pedal, etc. If the sewing machine is to be stopped after forming a predetermined number of stitches or a predetermined time period of stitches using only the outer needle, the number of stitches or time for stitching the outer corner portion can be set to a predetermined value by the operator's operation. A setting means is provided that generates a setting signal corresponding to the setting value, and the number of stitches or time is set so that the previously set number of stitches or time will not be changed even if the setting means is accidentally touched while the sewing machine is operating. A holding means was provided for holding a setting signal corresponding to the setting signal.

However, the setting signal generated from the setting means is reset when the power is turned off, and for example, the number of stitches or time becomes "zero," or the number of stitches or time changes from automatic sewing operation that sets the number of stitches or time to pedal operation. Since the corresponding manual sewing operation can be switched to any corresponding manual sewing operation, when turning on the power again and setting the number of stitches or time, the holding means must be returned to the inactive state, the setting means can be set, and then the holding means must be set. This has resulted in drawbacks such as the operation being complicated and work efficiency being significantly lowered. This invention aims to eliminate the drawbacks of the above-mentioned conventional ones.

j An embodiment of the present invention will be described with reference to the drawings. An electromagnetic clutch motor (
(not shown), a pulley 3 is fixed so as to rotate the 7 main shafts in conjunction with the electromagnetic clutch motor, and a pulley 3 is attached to the rear end of the main shaft once for each rotation of the main shaft. A needle position detection device 4 is provided for detecting the main shaft rotation angle corresponding to the vertical position of the needle bar that moves up and down.

The needle position detection device 4 is designed to detect a rotation angle 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 drives the motor at a set rotation speed proportional to the amount of pedal depression. The speed is controlled by a circuit to rotate the shaft. Needle bars 6a and 6b with needles 5a and 5b fixed to their lower ends are arranged on the left and right sides perpendicular to the cloth feeding direction, and the jaws 7 are movable up and down in synchronization with the main shaft.
When the known stop mechanism 8, which is supported by the needle bar and receives an acting force that normally maintains it in an inactive state, becomes active, one of the left and right needle bars 6a and 6b is appropriately disconnected from the main shaft. can be held in a resting state before 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 base of a lever 10 disposed forward of the tip jaw 7 is connected to the other end. When the lever 10 is fixed and rotated in one direction around the support shaft 9, for example, clockwise in Figure 1, the needle bar 6a on the left side in Figure 1 is rotated, and when it is rotated counterclockwise, it is rotated on the right side in Figure 1. The pause mechanism 8 operates so that the one needle bar 6b is in the pause state, and the pause mechanism 8 operates so that both the left and right needle bars 6a, 6b are in the operating state when the needle bar 6b on the right side is placed in the intermediate position between the clockwise and counterclockwise directions. It is related so that it has no effect. A cam plate 16 is fixed to the rear of the connection portion of the support shaft 9 with the stop mechanism 28, with the central portion of the tip formed in a convex shape to form a protrusion 15.
In addition, a coil spring 18 rotatably supported on a shaft 17 parallel to the support shaft 9 and having one end fixed to the sewing machine frame 1 is used to keep the second
The three ends of the engaging body 19 that receive the force acting leftward in the figure are formed into a forked shape, and one side of the engaging member 19 is bent forward so that the inner end surface of the locking portion 20 faces the end surface of the cam plate 16. Place and lever 10
is in the intermediate position, the inner end surface of the engaging portion 20 engages with the protrusion 15 of the cam plate 16, and the three engaging members 19 are moved to the right in FIG. When the lever 10 is rotated to one or the other position, it engages with the notches 21a or 21b on both sides of the protrusion 15 of the cam plate 16, and the engagement body 19 is rotated by the force of the coil spring 18. The cam plate 16 is rotated to the left in FIG. 2, and the cam plate 16 is maintained in the rotation position against the acting force of the stop mechanisms 4 and 8. In addition, the support portion 21 protruding to the side of the engaging body 19 is connected to the operating rod 1 disposed in front of the machine frame.
1, the tip of the plunger 23 of the electromagnet 22 is fixed, and when the electromagnet 22 is activated, the plunger is attracted and the engaging body 19 is moved against the force of the coiled spring 18 to the engaging part 20. The arm plate 16 is engaged with the protrusion 15 of the arm plate 16 so as to be rotated to the right in FIG. In front of the sewing machine head on the top surface of the table 1, there are a total of nine needle selection buttons 12 in three rows, vertically and horizontally, which control the electric circuit described later to set the number of square stitches using a single needle, and a corner stitch needle. A single manual button 13 having an arbitrary number and a single LO that maintains the electric circuit set by the selection operation of those buttons in the set state.
A switch button group including a CK button 14 is arranged, and the LOCK button 14 is locked in a pressed position by one pressing operation, and is released from the locking by a second pressing operation. Next, to explain the electric circuit of this embodiment, a logical H level voltage is applied to the terminal ■C when the power is turned on, G is a well-known NAND gate, ■ is an inverter, and 0R
is an exclusive OR gate, FF is an RS flip-flop circuit, and Ff is a D flip-flop circuit.

1 Stitch number setting circuit (Fig. 4) A. SW-I. The SW is an open/close switch that is closed by pressing each part of the needle selection button 12, and corresponds to stitches 1 to 9 in sequence, and MANU. SWl
3 is an open/close switch that is closed by pressing the manual button 13; LOCK. SW is an open/close switch that closes when the LOCK button 14 is pressed.

D. C is A. SW-I. Nine input parts a connected to SW
-1, and when an L level input occurs from a switch connected to one of each input section, it converts the numerical value of the number of stitches corresponding to that switch into a binary code and converts it into a binary code.
Inverted outputs are generated at the four output sections of h. B and R are bistable latches having an A-D input section that receives the outputs of decoders D and C(7)'A-h, and when the input of the latch input section j falls from H to L, the A- An output obtained by inverting the D input is generated and held at 0a-0d, and between 0a and d
The output is inverted by 121 to 124 and becomes U, ■, and in Figure 5.
Connect to W and X. P. S is an oscillator that instantaneously generates an H signal when the power is turned on, and this instantaneous signal makes the transistor Trl conductive, causing the set input of FFl to instantaneously become L, making the output of FFl L, and the output of G5. B. on L-H. A rising signal is input to the latch input section j of R. 11 Sewing machine control circuit (Figure 5) L. SW is an open/close switch that closes when the pedal is pressed forward; D. SW is an open/close switch that closes when the pedal is depressed 5, and Re and SW are open/close switches that close when the operating rod 11 is pressed.

N. P is a detection switch provided in the needle position detection device 4, which detects the upper and lower positions of the needle separately and generates an H level signal for each 1r at each position. ) captures the needle thread loop. C. T is a counter, N. An upper position signal is input from P and counted, and a binary code output is generated at the A-D output section. The outputs of A-D are input to 0R1 to 10R4 separately, and 0R1 to 0R4 are input to the previous U, ■
, W, and X are input separately. U. SW is a normally closed switch that opens when the lever 10 is rotated from the intermediate position to one side or the other; R is a reset double circuit, which generates an L output from when the power is turned on until the first front pedal depression operation, and after becoming a H output due to the first pedal front depression operation, holds that output until the power is cut off. Ffl is 2G when all outputs of 0R1 to 0R4 become H.
When the G7 output becomes L and the clock input from 114 becomes H, the Q output becomes L and the O output becomes H. When the G8 output becomes H and the input from 115 becomes H, the respective outputs are inverted.

Ff2 uses the O output of Ffl as a clock input, and stands on that input! The output is inverted every time a rising signal is received. 0S1
, 0S2 are one-shot multivibrators, which generate L outputs for the set times of ΔTl and ΔT2, respectively, when there is a trigger input. In particular, ΔT2 is a one-shot multivibrator when the sewing machine is driven at a predetermined low speed. This is the time it takes for the needle to move up and down once. Re
, SOL is a solenoid of the electromagnetic device 22, which is energized when Gl8 becomes an H output to put the electromagnetic device into an active state.
T. SOL is a solenoid of an electromagnetic device associated with the thread tension regulator 24, and when 117 becomes an H output, it is energized to operate the electromagnetic device. S. C is an upper limit speed setting circuit that sets the driving speed of the electromagnetic clutch motor. Normally, the speed is controlled to be proportional to the amount of forward depression of the pedal, but when the transistor Tr2 is turned on, it is driven at a predetermined low speed. Control as follows. M. D is a drive control circuit for electrically driving or stopping the motor;
Control is performed so that when Gl9 becomes an output L, it is driven, and when it becomes an output H, it is stopped. Also U. S is a top stop command circuit which generates a command signal so that the sewing machine stops at the needle top position when G2O becomes the L output. The present invention has the above-mentioned configuration, and its use will be explained next.

Setting the number of stitches When the power is turned on from the state shown in Fig. 4 and Fig. 5, the terminal V
An H level voltage is applied to P.c, and in the needle setting circuit of FIG. An instantaneous H signal is generated from S, transistor Trl becomes conductive, the set input of FFl becomes L, the FFl output becomes L, and this L output causes G3 to become H.

A. SW-1. D. SW is open. C(7)′A
-h output becomes H, MANU. Since the SW is also open, the input to G1 becomes H, H, and the output becomes L. The H inverted by 1 becomes the G2 output, and G2 becomes L. Therefore, since G4 becomes H, G5 becomes an output H due to the instantaneous L input due to the conduction of the transistor Trl, and then immediately becomes L.
This becomes the output. B. G5 output as latch input j. R is G
The output L which inverted the states of the A, B, C, and D inputs due to the fall of the 5 output to H is 'Qa, Ob, Oc,'Q
d occurs. Therefore, when corner stitching is to be performed at this time, the number of stitches can be arbitrarily selected by operating the pedal. To set the number of stitches for corner stitching, press the needle selection button 12, for example, the four-stitch needle selection button, and press E. If SW is a closed circuit, D. The outputs of C(7)'A, 100, °C-, h become H, H, L, H, and G2 becomes an H output. G2 H
When the G4 input becomes active, the 12 output becomes the L output, and the 12 output is delayed by the capacitor C and then operates to become the G2 input, and also becomes the reset input of FF1, making the FF1 output H. Since lever 10 is in the intermediate position, U. SW(
(Fig. 5) is a closed circuit, the lead wire Y becomes H through 15, 16, and 120, and the G4 input becomes H of Y, G2, and G3.
and 12 delayed H, momentarily becomes L output,
G5 becomes an H output for a short time and then becomes an L output. By its fall, B. R is A, B, C, D input H
, H, L, H is inverted and the output L, L, H, L is 0a,'
Retained as Qb, Oc, and Kan-d outputs. To change the number of stitches, press another needle selection button, for example, needle selection button 1 for three stitches.
Press 2 and press C. When SW is closed, D. The output of C is L,
L, H, H, G2 becomes H output, G4 becomes L output for a short time as before, the output of G5 becomes above L-H, and B. R generates outputs H, H, L, L8Oa, Ob, Oc, Od which are inverted versions of L, L, H, H of A, B, C, D inputs. Press the LOCK button 14 to set the pressed position to LOCK. When SW is in a closed circuit state, 13 becomes H,
13, FF1 H is input to G3, the output becomes L, and G
4 is held at H output. Therefore, press the LOCK button 14 again to return it to LOCK. Unless the SW is opened, press the manual button 13 or another needle selection button, for example, the needle selection button 12 for four needles, and press the E. Close SW and connect D. C<7) N, W, °C -, ■Output is 2H, H
, L, H and G2 becomes H, G4 does not change due to the L input from G3, and B. B. Since the signal on H is not input to the latch input j of R. The output of R remains unchanged. Also, before turning on the power, set the LOCK button 14 to the 2-press position to LOCK. When turning on the power after closing the SW, use LOCK. Since SW is closed, 13 is H
However, G3 becomes H from the L output of FF1.

Then, in the same way as the explanation when the power is turned on, G2 becomes L, G4 becomes H output (3), and while the transistor Trl is conductive, G5 output becomes H, then becomes L output, and B.R output is all L, and the number of corner stitches is arbitrary.From this state, press the needle selection button 12, for example, the needle selection button 12 for 9 stitches, and close the I.SW, and the output is L.
, H, H, L, and set G2 to H, and 12 as above.
is delayed by the capacitor C and becomes the output L, and during that delay, G4 becomes L, and the output L of 12 makes the FF1 output H, and G4 becomes H, and G5 becomes above H, and the output becomes 40B. The R output is held at H, L, L, H. ■U,■,W,
L, L, H, H are input to X.

When the lever 10 is rotated clockwise in FIG. 1 from the intermediate position, the needle bar 6a is held at rest by the pause mechanism 8 when it next rises to the upper position, and the cam plate 16 is rotated counterclockwise in FIG. The engaging portion 2 of the engaging body 19 rotates from the protrusion 15 to
0 is disengaged, and the engaging body 19 is rotated counterclockwise in FIG. 2 by the acting force of the coiled spring 18 to engage with the notch 21b of the cam plate 16, and the USW is opened. 15 is L, . l6 becomes an H output, and together with the H output of GR, the Gll output becomes L, and the 113 output becomes H.

16 H output becomes Gl3, Gl4, FF2 input, and G
l3 becomes L due to the H outputs of 16 and 18, causing the FF2 output to become L, and the Gl4 output to become H.

Since the FF2 output does not change unless the USW is opened and the 16 output does not become L, Gl4 is held at the H output. Push the pedal forward to operate the L. When SW is closed, 19 becomes an output H, and G19 becomes an output L, and M. D controls the motor to be in a driving state, and at this time, the 113 output is H, and U, V, W, and X are L, L, H, H, so G6
is H, and the G9 output is L, so the 116 output becomes H, making Tr2 conductive, and S. C controls the motor to drive at a predetermined low speed.

The main shaft of the sewing machine rotates and single needle stitching is performed using the needle bar 6b. A position signal H above P is generated and C. When the third upper position signal becomes the clock input, C.T becomes the clock input. T(7) A, B, C, D outputs are H, H,
Since it becomes L, L, 0R1 to 0R4 become H output, and G7
is the output L, 114 is the output H, and the output of Ffl is inverted to become the output L and 'Q output H. Q output L is C. with Gl2 as H output. Clear T, the O output H inverts the Ff2 output, sets the Q output to H, and sets Gl7 to the output L, and continues to press the pedal forward to set the L. Even if SW is closed, Gl9 becomes H output and M. D stops the motor when the needle down position signal is generated. Turn the cloth around the needle 5b at a predetermined angle, and press the pedal forward again to move the cloth to the L. When SW is closed, 119 becomes H output, Gl5 becomes L output instantaneously, G8 becomes H, 115 becomes L, Ffl is reset, and its output is inverted to make Q output H. The output between M and M is set to L, Gl7 is set to H output, Gl9 is set to output L along with H of 19, and M. D is S. The motor is controlled to be driven at a predetermined low speed set by C, and the sewing machine forms the remaining stitches on the outer corner with a single needle. N. When three upper position signals are input from P, that is, when the position corresponding to the inner corner is reached, 0R1 to 0R4 become output H, G7 becomes output L, and 114 becomes output H, as before. to invert the output of Ffl, and the Q output becomes L. The O output becomes H, and the O output becomes H, which causes the Q output of Ff2 to become L. Ff
The Q output L of 2 triggers 0S1 to produce an L output for Δt1, and sets Gl8 to H to set Re. SOL is energized, the plunger 23 of the electromagnetic device 22 is pulled to the right in FIG. 2, the engaging body 19 is rotated clockwise in FIG. 16 is the second one due to the force of the stop mechanism 8.
It rotates clockwise in the figure, and engages and maintains the engaging portion 20 with the tip end surface of the protrusion 15. Therefore, the lever 10 also returns to the intermediate position and the U. As the SW closes, the pause mechanism 8 also becomes inactive, and the needle bar 6a, which had been at rest, is interlocked with the main shaft, and the other needle bar 6b is moved.
It is possible to move up and down in synchronization with the In addition, in this example, corner stitch formation using a two-needle sewing machine was explained.
Other stitches may be formed using other sewing machines, for example, backstitching or the like may be formed for a predetermined length using a single needle sewing machine.

Further, in this embodiment, a sewing machine that forms a predetermined number of stitches using a counter has been described, but the sewing machine may be driven for a predetermined period of time using a timer circuit to form a predetermined number of stitches. As described above, according to the present invention, when the power is turned on, the holding means 14, LOCK. When the SW is in the operating position, the holding signal is cut off, and when the setting signal is generated thereafter, the holding signal is enabled, so that the setting means that was turned off when the power was turned off can be used again for a predetermined period of time or when the power is turned on. When setting the number of stitches, you can immediately set and hold the predetermined number of stitches or time by operating the setting means, so as in the past, when the power is turned on, the holding means is operated to the inactive position, and then the setting means is set for the predetermined time and time. This eliminates the need for the troublesome work of setting the number of stitches and returning the holding means to the working position, and is useful for setting the number of stitches or time when the power is turned on, for example, in a machine that performs a specified corner stitch on a two-needle sewing machine, etc. The operation becomes simple and easy, and the effect of significantly improving work efficiency can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the sewing machine main body of this embodiment, FIG. 2 is a front view of the locking mechanism of the operating means, and FIG. 3 is a perspective view of the locking mechanism.
Figure 4 is the stitch count setting circuit, Figure 5 is the sewing machine control circuit, and Figure 6 is the sewing machine control circuit.
The figure shows a time chart of the stitch number control circuit, and FIG. 7 shows a time chart of the sewing machine control circuit.

Claims (1)

[Claims] 1 A sewing machine capable of automatic sewing operation that starts in response to the operation of an operating member and stops after forming a seam line of a predetermined length, and a sewing machine that allows the length of the seam line to be set to a predetermined length by operation, A setting means that generates different setting signals corresponding to the set length and is reset when the power is cut off, and a holding signal that holds the setting signal corresponding to the set predetermined length and invalidates other setting signals. The holding means is movable and lockable between an active position where the holding signal is activated and a non-active position where the holding signal is cut off. A control device for a sewing machine comprising a control circuit for enabling.