JPS5912312B2 - cycle sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention enables the sewing machine to be driven by setting the starting lever to the starting state by traction for a short time in connection with a single operation of the operating means,
Regarding a cycle sewing machine in which the starting lever is returned to stop the sewing machine after a predetermined number of stitches are formed between two holes of a button, the sewing machine can be stopped in connection with a single operation of the operating means by a switching operation of the selection means. This invention relates to a sewing machine that is driven by either a cycle or a double cycle.

Conventional 1. In order to sew a button with two holes using a cycle sewing machine as described above, in the case of a cycle drive, the sewing machine is started by pulling the start lever by pressing the pedal once, and the sewing machine is sewn with two holes. When the starting lever returns after a predetermined number of stitches have been formed, the sewing machine is stopped and the presser foot is raised by actuating means such as an electromagnet.This sewing machine has four holes. When using two-cycle operation to sew buttons, start the sewing machine by depressing the pedal once, and after forming a stitch between any two holes of the four-hole button in the first cycle, In connection with the return of the start lever, the sewing machine is stopped and the actuating means is activated to raise the presser foot, and in connection with the completion of the cycle, the start lever is pulled again to start the sewing machine, and the four-hole button and other After forming the stitch between the two holes, the sewing machine was stopped and the presser foot was raised in the same manner as described above.

However, since the presser foot rises at the completion of the first cycle, the fabric with the button sewn by forming a seam between any two holes is pulled up together with the button when the presser foot rises, and the next When the presser foot lowers at the start of a cycle, the fabric may be twisted or wrinkled, and when the next cycle begins, a seam may be formed between the other two holes of the button. There were drawbacks such as an ugly finish and a decrease in product quality.

In addition, when the first cycle is completed and the presser foot rises, the button held in the holder moves within the holder due to the vibration, etc., and the other two holes do not correspond to the needle drop position, and the next When the needle moves up and down due to the cycle drive, the needle engages with the periphery of the hole in the button, causing damage to the needle and button, which has the disadvantage of requiring time to repair or replace, reducing efficiency. .

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. The sewing machine shown in FIG. At one end in the axial direction, there is a pulley 2 which normally receives an elastic acting force to the right in the axial direction and which is idling in conjunction with a motor (not shown), and which transmits or blocks the rotation of the pulley 2 to the main shaft 1. In addition to supporting a clutch mechanism (not shown) disposed between the pulley 2 and the main shaft 1, the outer circumferential portion 3a corresponding to the driving of the sewing machine and a part of the outer circumferential portion 3a are provided with a radial direction corresponding to the stopping of the sewing machine. A cutout cam 3 having a notch 3b formed therein is fixed.

The connecting arm 5 is rotatably supported on a shaft 4 parallel to the main shaft 1, and is normally subjected to an elastic force so as to rotate counterclockwise. The blocking body 6 that engages with the portion 3b is fixed, and the rear end is biased to push the rear end downward and rotate the connecting arm 5 clockwise, so that the blocking body 6 is inserted into the notch of the blocking cam 3. A starting electromagnetic device 7 is connected which acts to separate above 3b.

The distal end of the suppressing body 8 that rotates together with the connecting arm 5 is connected to the blocking body 6.
When it engages with the outer peripheral part 3a of the cutoff cam 3, it is located on the axial extension line of the main shaft 1 shown in FIG. When the blocking body 6 is inserted into the notch 3b from the outer peripheral part 3a, the suppressing body 8 rotates counterclockwise together with the connecting arm 5, and its tip moves downward from the axial extension line of the main shaft 1. The pulley 2 is separated from the pulley 2 to release the pressure on the pulley 2, and the pulley 2 slides to the right in the axial direction to cut off the interlocking movement with the main shaft 1, and the cut-off body 6 fits into the notch 3b of the cut-off cam 3, thereby shutting off. The rotation of the cam 3 stops, and therefore the main shaft 1 also stops.

A needle bar 10 supported on the machine frame of the sewing machine head 9 so as to be movable up and down has a needle 11 fixed to its lower end, and moves up and down a predetermined number of times in relation to one revolution of the main shaft 1.

The needle plate 13 and the button holder 14, which are arranged in the moving path of the needle 11 above the jaw part 12 facing the part 9, are supported by the feed arm 15 and the support arm 16, respectively, as shown in Japanese Patent Publication No. 35-7943. Controlled by the device, the button support 14 holds the button in place and the sewing of the button forms a predetermined stitch between the holes and is raised by an electromagnetic device to be described below.

The tip of the wiper 17 supported at the bottom of the sewing machine head 9 moves across the travel path of the needle 11 by the action of the wiper electromagnetic device 18, sweeps away the needle thread connected to the cloth, and returns to the initial position due to the non-action of the electromagnetic device 18. It is related to return.

Also, although not shown, below the throat plate 13, just before the cut-off body 6 fits into the notch 3b of the cut-off cam 3, it is interlocked with the cut-off cam 3 and can be moved to intersect the vertical movement path of the needle 11. A thread cutting device is provided which has a thread cutting blade that catches and cuts the upper and lower threads connected to the sewing object.

Next, the electric circuit will be explained.

C, SW are limit switches S that open when the pedal (not shown) is depressed to the initial position; SW are limit switches 1 and L that become closed when the pedal is depressed further from the initial position and operated to the later position; SW
is a limit switch that opens when the interrupter 6 is separated from the cam surfaces 3a and 3b of the interrupter cam 3;
By opening the circuit, the sewing machine is driven in -cycles,
This is a manual switch that switches to two-cycle drive by closing the circuit.

c, My are magnets of an electromagnetic device (not shown) that lifts the holding body 14 above the throat plate 13 by force; S, MS;
' is the magnet of the starting electromagnetic device 1 that presses down the rear end of the connecting arm 5 by force, WoMy is the magnet of the wiper electromagnetic device 18 that operates the wiper 17, and each magnet is equipped with drive circuits Z1 to Z3. .

When the power is turned on, a high voltage is applied to the terminal vh to energize each magnet, and the terminal e is logically set to an H level (
Thereafter, a voltage of "H" or "L4" is applied.

■ is IC Inverter, G is IC Nantes Gate, W
1 to W4 are one-shot multivibrators (hereinafter referred to as one-shot, acupuncture needle FF is a flip-flop, and D and FF are D-type flip-flops) each having a predetermined setting time Δt1 to Δt4.

1. R is an initial reset circuit to stabilize the operation of the FF when the power is turned on, and it instantly goes low when the power is turned on.
Generate output.

Further, P is a pulse oscillation circuit that generates switching pulses.

The present invention has the above-described configuration, and when the power is turned on, respective voltages are applied to the terminals Vh and Ve, and the circuit 1. An instantaneous moment occurs from R and flip-flop FF1
The output of the one-shot W4 is set to H, the Q output of the flip-flop D and FF is set to L1, and the Q output of the flip-flop FF2 is set to H.

Since each switch is in the state shown in FIG. 2, the gate G1 is connected to the inverter ■1. ■H is input from 6 and its output is L, and the H inverted by inverter ■3 becomes the gate G2 manual power, and the gate G2 has Q of flip-flop FF2, Q1 of one-shot W4, H of inverter ■3 and ■9. input and set the output to L.

The H inverted by the inverter 4 triggers the one-shot W1, and the output of the gate G3 becomes H due to its Q output, and after Δt1 has elapsed, the output becomes H intermittently due to the switching pulse of the oscillation circuit P.

As a result, the drive circuit Z1 is closed via the gate G4 and the inverter I, the lifting magnets C and MP are energized, and the holding body 14 is lifted.

When a four-hole button (not shown) is inserted into the button holding part of the holder 14 and a cloth is inserted between the holder 14 and the throat plate 13 and the pedal is depressed to the initial position, the inverter 1
1's power becomes H, gate G1's human power becomes L, the output H is inverted by inverter 3, gate G2 output becomes H, inverter 4 becomes L, and gate G4 is gated. The output is H regardless of the output of G3, and the drive circuit Z
1 opens the circuit, deenergizes the magnets) C and Mf, and removes the holding body 14.
descends onto the throat plate 13 and clamps the cloth between the two.

When the pedal is further depressed to the latter position, the limit switches S and SW are closed, the inverter ef output becomes H, and the inverter I2. I6. Inverter I delayed from becoming L by I, fDH and integration circuit Y
The output H of 8 is input and the output becomes L.

The gate G2 output resets the flip-flop FF1 to provide a Q output, and also serves as a set input for the flip-flop FF2 to set the Q output to L.

Gate G6 is activated by the Q output of flip-flop FF2.
becomes H, and the rising signal causes one shot W.
2 is triggered, the Q output becomes L during Δt2, and one-shot W3 is triggered by a rising signal when the Q output returns to pressure after Δt2, and the Q output becomes H during Δt3.

As a result, the Q output of the one-shot W3, the gate G6, and the H of the inverter 113 are input to the gate G7 and become an output, which is inverted by the inverter 114, and the drive circuit Z2 is closed and the starting magnet is S and MS' are energized, and the electromagnetic device 7 is activated to push down the rear end of the connecting arm 5 and rotate it clockwise.

As the blocking body 6 separates upward from the notch 3b of the blocking cam 3, the tip of the suppressing body 8 presses the pulley 2 to the left in the axial direction, and the main shaft 1 and pulley 2 are interlocked via the clutch to start the sewing machine. do.

When the interrupter 6 is removed from the notch 3b of the interrupter cam 3, the limit switch LSW is opened and the inverter 11's manual power becomes L, and the H reversed by the inverter ■1□ becomes the input to the gate G1□ and its output becomes L. Make it.

After Δt3 has elapsed, the Q output of the one-shot W3 returns to L, the gate G2 output becomes H, the drive circuit Z2 is opened, and the magnets s, M? However, since the cutoff body 6 engages with the outer circumference 3a of the cutoff cam 3 that rotates in conjunction with the main shaft 1 and holds the connecting arm 5 in the clockwise rotating position, the sewing machine continues to be in the driving state. The stitching of the three tubes on one side of the four-hole button held in the holder 14 is performed by a cycle drive in which stitches are formed between the holes.

Just before the cut-off cam 3 rotates once and the cut-off body 6 refits into the notch 3b of the cut-off cam 3, a thread cutting device mechanically linked to the cut-off cam 3 is activated, and the thread cutting blade catches the upper and lower threads. and cut.

When the blocking body 6 is fitted into the notch 3b, the connecting arm 5 rotates counterclockwise, and the suppressing body 8 also rotates counterclockwise together.
The tip of the sewing machine separates downward from the axial extension line of the main shaft 1, releases the pressure on the pulley 2, cuts off the connection between the pulley 2 and the main shaft 1, and stops the sewing machine.

In addition, limit switches L and SW are closed, causing the inverter to fail.

The output becomes H, the gate G11 becomes an H output, one shot W4 is triggered, and the output becomes H and the output becomes L during Δt4.

The output of gate G2 is set to H due to the rotation of the inverter I.
4 is L, so one shot W is not triggered and the rising magnets) C and MS' are held in a de-energized state, and
The gate G2 output is set to H, the inverter 112 is set to L, the flip-flop FF2 is reset, the output is set to H, and the gate G6 output is set to L along with the output of gate G-1-G.

Q output H of one shot W4 is inverter l61113
The gate G2 output is set to L along with the H output of 11 and the button sewing machine move across the needle thread connected to the hole, catch the needle thread, and pull out the cut end of the needle thread from the hole. After △t4 has elapsed, the output of one shot W4 is increased. By returning to L, gate G1□ becomes H output and opens drive circuit Z3.
Magnet) W, MP is deenergized and the wiper 17 moves back.

As gate 1-G1□ changes its output from H to L and from L to H after △t4 elapses, gate G8 changes its output from H, and from L to H after △t4 elapses, and its rising signal When becomes the set input of flip-flop D and FF, the output of flip-flop D and FF becomes H, and with inverter ■ and L set to L, the output of gate G2 is set to H and one-shot W1 is not triggered. The output of gate G9 is set to L, and the output of gate G6 is set to H to trigger one shot W2.

The output of one shot W2 is between △t2 and △t
One shot W3 is triggered by the rise of calculated power to H after 2 elapses, and gate G2 is triggered by the Q output H.
The output is set to L, the drive circuit Z2 is closed via 114, the starting magnets S and MP are energized, and the sewing machine is started in the same manner as above to perform the second cycle drive. The sewing of the three cylinders forms a seam between the holes.

At the completion of the second cycle, the thread cutting device operates to cut the upper and lower threads just before the cut-off body 6 fits into the notch 3b of the cut-off cam 3, and when the cut-off body 6 fits into the cut-out 3b, the limit switch L , when SW is closed, the H output of inverter ■6 sets gate G11 to H output and triggers one-shot W4, and during Δt4, gate G12 is set to L output and energizes wiper magnets W and MP in the same way as above. wiper 17
, and pull the upper thread out of the button sewing hole.

When the gate G1□ becomes the output H after Δt4 has elapsed, the output of the gate G8 also becomes H through the inverter 115, which becomes the T input of the flip-flops D and F''F, and the circuits of the flip-flops D and FF. The output becomes L and gate G9,
Inverter ■, H output and flip-flop FF2 H
Due to the output, the gate G6 becomes an L output, and the H output of the inverter 9, together with the H output of the inverter 3, the Q of the flip-flop FF2, and the Q of the one-shot W4, makes the gate G2 output L, and the inverter 4 becomes the H output. Trigger the one-shot W1 through the inverter, set the output to L during △t1, make the gate G3 an output, close the drive circuit Z1 through the gate G4 and the inverter (2), and close the drive circuit Z1 (the rising magnet).
C and Mf are energized to raise the holder 14 above the throat plate 13, and after Δt1 has elapsed, the gate G3 is intermittently set to H output by a switching pulse from the oscillation circuit P, and the magnets C and MP are activated by a small current. The holding body 14 is held in the raised position.

Next, when manual switches D and SW are opened and switched to -cycle drive, the inverter IIO output becomes L, so the output of gates G8 and G becomes H, and the cycle output of flip-flops D and FF becomes No matter how many times the sewing machine repeats the cycle, it becomes L, the inverter (■), and the output becomes H.

Therefore, after the sewing machine is started by depressing the pedal, the cycle is completed and the thread trimming device is activated, and the cut-off body 6 is fitted into the notch 3b of the cut-off cam 3, and the limit switches L and SW are closed. When the inverter I6 output becomes H, the H output causes inverter I, 1° gate G1
, the one-shot W4 is triggered and the Q output becomes H, Q output during Δt4, and the wiper magnet W, Mf? energizes and operates the wiper 17,
The flip-flop FF2 is reset by the output from the flip-flop FF2 to make the output H, and when the output becomes H after Δt4 has elapsed, the outputs of the inverter I3+Ig, the Q of the flip-flop FF2, and the Q of the one-shot W4 are sent to the gate G2. H is input, gate G2 output becomes L, and inverter ■
4, one shot W1 is triggered, and the magnets C and MP are energized as described above to raise the holding body 14 and hold it in the raised position.

Although this example was explained using an electric circuit,
It may be controlled by a fluid circuit such as an air flow, and other actuating devices such as an air piston may be used in place of each electromagnetic device.

As described above, according to the present invention, the sewing machine is driven by setting the starting lever to the starting state by pulling the starting lever for a short time, and after forming a predetermined number of stitches between the two holes of the button, the sewing machine is operated in conjunction with the return of the starting lever. In a cycle sewing machine, the cycle sewing machine has a selection means for selecting either one-cycle drive for sewing two-hole buttons or two-cycle drive for sewing four-hole buttons, as well as a cycle drive for stopping the button.
- In the case of cycle drive, - when the cycle is completed, the actuating means for raising the presser foot is activated to raise the presser foot;
On the other hand, in the case of two-cycle drive, the operating means for raising the presser foot is not activated when the first cycle is completed, and the operating stage is activated only when the two-cycle is completed, so that two-cycle drive is possible. When selected, the presser foot does not rise and the buttons and fabric do not move when the first cycle is completed, so the button is not sewn with the fabric twisted or wrinkled, resulting in a neat finished product. In addition to being effective in improving product value,
Because the button and needle will not engage and damage both,
Stitches can be reliably formed between button holes, eliminating the need for repair or replacement of buttons or needles, thereby improving work efficiency.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a cycle sewing machine, Figure 2 is an electric circuit,
FIG. 3 is a time chart. In the figure, 3, 5.6 are control devices, 14 is a presser means, D and SW are selection means, S and Mf are starting means, and CMfI
is the actuation means.

Claims (1)

[Claims] 1. A starting lever is movable between a starting position for driving the sewing machine and a stopping position for stopping the sewing machine, and the starting lever is held in the starting position by pulling the starting lever to the starting position. A control means 3, 5.6 is configured to return to the stop position and generate a stop signal after forming a predetermined number of stitches in between, and a holding part for holding the button, which always exerts downward elastic force. The receiver includes cloth holding means 14 which clamps the cloth between the holding part and the throat plate in the lowered position, and selection means D and SW which can be switched to generate a first or second signal. , operating means for generating a starting signal in connection with the starting operation;
W, starting means S and M connected to each other so as to act in relation to the starting signal and pull the starting lever from the stop position to the starting position, and actuating means in relation to the actuation signal to raise the presser means in the lowered position. actuating means C1My for moving and holding in position; a one-cycle driving state for generating an actuating signal in conjunction with the starting signal and thereafter generating an actuating signal in connection with a first stop signal; an actuation circuit that enables a two-cycle drive state in which a start signal is generated in conjunction with the first stop signal and an actuation signal is generated in connection with the next stop signal; and an actuation circuit in relation to the first signal. A control circuit having a switching circuit D"FF, I10rOB for setting the D"FF, I10rOB to a -cycle drive state and a two-cycle drive state in relation to a second signal.