JPS61226097A - Speed controller of cycle sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a speed control device for a cycle sewing machine, such as a hole sewing machine, which forms cycle stitches 11.

[Conventional technology]

Cycle sewing machines, for example, hole sewing machines, ■During the sewing cycle, high-speed operation (for example,
3800 rpm), low-speed operation (1-step deceleration operation, e.g. 900 rpm) to safely and reliably operate the cloth cutting knife drive for opening the buttonhole, and stop F.
At times, a fixed position stopping function is required to ensure that the side rod stops at the top dead center.

In a cycle sewing machine that uses a pole number changing motor as a drive source, switching from high speed operation to low speed operation is performed by the pole number changing motor and a speed reducer, and stopping at a fixed position 1- is performed by a cutoff mechanism.

On the other hand, a cycle sewing machine equipped with a motor with an electromagnetic clutch and a brake and its control device controls high and low speed +11 and stops at a fixed position +l-
This is possible using only an electromotor, eliminating the need for a speed reducer or cut-off device.

Cycle sewing machines using this electromotor operate at low speeds (900
Even if you try to stop the motor suddenly from the rpm state, it will not stop at the stop position and the main shaft will overrun.

For this reason, when the stop [l- signal appears], low-speed operation (900
-pj) to a standby rotational speed (two-step deceleration operation, e.g. to a stop slower than this speed.

200 rpm), and then the set is brought to a stop in the 1-stop position.

[Problem to be solved by the invention]

This stop +l 4. The r in- is mechanically generated by a stop 1 spinner that is turned on and off by a hook removal lever operated by a breaking force J. Synchronization with the rotational position of the shaft
c becomes paratu〈'ha. This much IW in one sewing cycle
If the sewing is short, the cycle time for one cycle is short.
There was a problem in that the time between 111f and 113 when operating at 00 rpm becomes long, reducing work efficiency.

Therefore, an object of the present invention is to provide a speed control device for a cycle sewing machine that can shorten the time required for one sewing cycle and keep it constant.

[L Stage for Solving Problems] The speed control device for a cycle sewing machine according to the present invention is provided with a holding means that extends the time of low speed operation (one-step deceleration operation) compared to the conventional one.

〔Example〕

An embodiment of the invention will be described with reference to FIGS. 1 to 7.

In Figures 1 to 4, 1 is a 1-shaft rotatably supported on a sewing machine frame 1.2, 3 is a drive pulley fixed 71 to the 1-shaft 1, and 4 is the L441+1 shaft.
The worm gear 5 fixed to the worm gear 5 is a worm boiler attached to one end of the sunken shank 6 in a direction perpendicular to the shank 1, and meshes with the worm gear 4. 7 is a Liu number changing tooth 1 detachably attached to the other end of this Tsukuda 16.
j, 8 is a shaft provided on the shaft 6 in the 4th line, and 9 is a removable 41F function attached to one end of this shaft 8 to change the number of hooks ti! In city i, it is 1-conjunct with said tooth Ilj 7.

10 is a main cam drive I fixed to the other end of this support 8.
k1jli, 11 is the force 1 which is meshed with the tocam drive tooth Ilj 10, rotates once every l sewing cycle, -
The force 11 provided on the cam 11 performs the operations necessary for sewing machine operation during one sewing cycle, for example, the 4j feed arm connected to the 11 feed mechanism following the groove of the heart groove cam provided on the surface of the 1-cam 11. The stitches are fed by reciprocating (not shown). Change in the number of pieces mentioned above 1j 7
, 9 as appropriate.
By changing the rotation ratio of the sewing machine 11, the number of sets in one sewing cycle can be changed. Reference numerals 12 and 13 designate a speed changing cam and a cutoff cam provided on the surface of the main cam 11, 14 a hook pull lever whose center portion is pivotally supported by the sewing machine frame 2, and one end of which is connected to the main cam l.
A protrusion 15 that engages with the speed changing cam 12 and the cutoff cam 13 is provided on the surface of the l, and a hook portion 16 is provided on the other end.

Reference numeral 17 denotes a lever pivotally supported by a support 18 provided on the sewing machine frame 2, and the lever 17 is biased in the opposite direction of force by a lever 19 stretched between the central part and the sewing machine frame 2. . Reference numeral 20 denotes a locking protrusion provided at one end of the lever 17, which engages with a hook portion 16 provided at the negative end of the hook removal lever 14. Reference numeral 21 denotes a switch push plate provided at the other end of the lever 17, which controls the speed changeover switch 22 and the stop 1-switch 23 by 0N10FFft or 1J11 depending on the engagement state between the protrusion 15 and the speed change cam 12 and cutoff cam 13. . Speed selector switch 2
2 is pressed by the switch push plate 21,
When the suppression is released, an L signal is output. Also, stop 1-
When the switch 23 is pressed by the switch push plate 21, the switch 23 becomes L.
When the pressure is released ξ, an H signal is output. Reference numeral 24 denotes an L-shaped activation link, and a part of this elbow is rotatably supported by a support 25 provided on the sewing machine frame 2.
One end is connected to a starting pedal 27 via a rod 26.

Reference numeral 28 denotes a protrusion provided at the other end of the activation link 24, which presses a protrusion 29 provided at one end of the lever 17 when the activation pedal 27 rotates clockwise.

Reference numeral 30 denotes a mechanical motor that rotationally drives the drive pulley 3 with a V-belt 31, and an electromagnetic clutch 30a and an electromagnetic brake 30b are provided on the rotating shaft. 32
is a speed detection device for detecting the rotational speed of the -I axis l, which is provided on the axis 1 in the above-mentioned -; 33 and 34 are disks, respectively;
Magnets 35 and 36 are arranged near the outer periphery A and 1, respectively.

The angle between the magnets 35, 36 and the axis is θ (see FIG. 2), and 37, 38 are Hall elements f provided near the disc, which detect the magnetism of the magnets 35, 36, respectively. 39
is a control device that drives and controls the electromotor 30 to a preset rotational speed of 1 bar based on the speed detection device W132, the speed changeover switch 22, and the signals from the Hall element r37. and stop 1 - stop rotation based on the signal from switch 23 1
- to do. Hall elements /-37 and 38 are each magnet 35
．． When it detects the magnetism of 36, it outputs I and Cu. 40 is the (7) knob for setting the maximum four-speed rotation of the electric motor 30, and 41 is the ear/<-ta 4. la, 41b,
A speed switching circuit consisting of N^ND game 1-41c, L9F/F 41d and monostable multi-occurrer 41e, the end r of P-s F/F 41d
When the Q level is low l/pel (T-), the motor 30 is rotated in the opposite direction; (when the signal level of the speed selector switch 22 is high level (H), the speed set with the knob 40 is , for example, 3800 rpm, when L is 900 rpm+i), and when the end f'Q level is H,
Motor 30 regardless of speed selector switch level 41
to the stop 1- state. The magnets 35 and 36, the Hall elements f-37 and 38, the control device 39, and the speed switching circuit 41 constitute a holding stage that extends the time during which the rotary drive is driven at the speed after one step deceleration.

Next, I will explain the effect.

It is now assumed that the sewing machine is in the stop position IE, and the various parts are as shown in FIG. That is, since the cutoff cam 13 and the protrusion 15 are in the engaged state, the hook portion 16 is disengaged from the engagement protrusion 20 and the stop 1 switch 23 is released.
is pressed by the switch push plate 21 (at this time,
(The speed selector switch 22 is turned off). Therefore,
The electromotor 30 is reset p-≦F/F
41 The level of terminal Q of d is H, so it is stopped!
? It is in.

(+) In this state, when the starting pedal 27 is operated and rotated clockwise, the starting link 24 is rotated in the anti-discharge direction via the rod 26, and the protrusion 28 is pressed against the protrusion 29. Then, the 1/par 17 is rotated clockwise, and as a result, the switch push plate 21 is separated from the stop 1 switch 23, and the H signal is turned in from the stop 1 switch 23.
b. At this time, since the H signal from the Hall element 38 is inverted to L by the inverter 41a, the NAND gate 41c inputs the H signal as n-≦F/F 4
1 Input to terminal d≦. On the other hand, when the switch push plate 21 moves away from the stop switch 23, the level of the terminal A of the monostaple multi-hitter 41e changes from L to H, and as a result, an L pulse is output from the terminal Q, and 1lF -s Input to end J'R of F/F 41d.

Then, p-≦F/F The level of the terminal Q of 41d changes from H to L. When this L signal is input to the control device 39, the electromotor 30 starts rotating at a low speed of 900 rpm.

(2) Then, when the speed selector switch 22 is pressed and the stop I-speed selector switch 22 is turned on (STEP-
1), the H signal is input to the control device, and the electromotor 30 enters the high speed rotation (3fi00rp■) state (fifth
1Δ(a), (d)).

(3) Due to the rotation of the electromotor 30, the 1-shaft 1 rotates, and the worm wheel 4, the worm wheel 5.4 number changing gears 7, 9.1: the main cam 11 via the cam drive gear 10.
When the hook is rotated, the protrusion 15 of the hook removal lever 14 is disengaged from the cutoff cam 13, and at the same time, the hook portion 16 engages with the surface portion 20a of the engagement protrusion 20. At this time, start pedal 2
Even if the user takes his or her foot off the lever 7, the lever 17 will not return to its original position and the electromotor 30 will continue to rotate.

(4) Continue to drive the electromotor 30 at high speed (
3,800 rpm), sewing is performed, and when the protrusion 15 of the hook removal lever 14 comes into contact with the cam 2,
The hook removal lever 14 rotates slightly clockwise, and the hook portion 16 of the hook removal lever 14 and the engagement protrusion 20
is disengaged from the surface portion 20a and comes to engage with the surface portion 20b. Then, the lever 17 rotates counterclockwise in response to this displacement of the engagement position, and as a result, the switch push plate 21 separates from the speed changeover switch 22, turning off the switch 22. When the speed selector switch 22 is turned off,
The L signal is input from the input speed changeover switch 22 to the control device 39, and the control device 39 controls the electromotor 30.
The speed is reduced from 380 Orpm to 90 Orpm (one-step deceleration rotation speed) (see Figures 5(a) and (d)).

(5) When the electromotor 30 is driven to rotate at 80 rpm and the protrusion 15 and the cam 13 come into contact with each other during one rotation of the L axis immediately before stop 1, the hook portion 16 and the surface portion 20 of the engagement protrusion 20
b is disengaged, the lever 17 is rotated counterclockwise by the elastic force of the spring 19, and the stop 1 switch 23 is fully pressed by the switch push plate 21 and turned on. An L signal is input from the sowing stop switch 23 to the inverter 41b of the speed switching circuit 41. This L signal is applied to inverter 4
After the level is inverted (becomes H) at 1b, it is manually input to one input terminal of the NAND game 41c. However, even if the stop 1 switch 23 is turned on, the electromotor 30 does not stop immediately.

(6) After the stop 1 switch 23 is turned on, the magnetism of the magnet 36 is detected by the Hall element 38 after a delay time
When input to inverter 41.1, this L transmitter is input to inverter 41.1. After inverting to H at a, NAND game) 4
It is input to the other input terminal of 1c. Since the level of the input terminal f- of the force is H, the NAND game I/41c inputs the H0 month to the terminal S of the R-3F/F 41 d. At this time, R-≦F/F 41 d terminal R is H
Therefore, the H signal is input from the Q terminal of the F/F 41d to the control device 39, and the motor 30 is decelerated from 90 Orpm to 20 Orpm.

In other words, even if the stop 1 switch is turned on, the speed is not immediately decelerated from 90 Orpm to 20 Orpm as in the conventional case, but the magnetism of the magnet 36 is detected only after a delay of time X after the stop 1 switch and 2 switch are turned on. 900rpm+ to 2
The speed is reduced to 0 rpm. Then, when the magnetism of the magnet 35 is detected by the Hall element 37, the Hall element 7-3
An L signal is input from 7 to the control device 39, and the electromotor 30 is stopped rotating at the nail 441-stop position by the control device 39.

(7) Areas A and B of the hatched areas shown in figure ffi6 represent 4 numbers when rotated by rotation angles α and β, respectively, and α+β=0 (however,
θ: angle with the axis of the magnet 35, 36), so the area A + B is always constant, and the speed after two-step deceleration (
20Orpm), the time for rotational driving is constant.

Furthermore, the areas P and Q of the hatched area shown in FIG.
Since the number of stitches from pm) to stop I- is constant, the number of stitches is the same. Therefore, since the one cycle time of this embodiment is shortened by the time T, the working time can be shortened.

〔Effect of the invention〕

As explained above, this invention extends the one-step deceleration time, so the time required for the IN cycle can be shortened and kept constant, and as a result, the sewing work time can be shortened. This has the effect of being able to achieve this goal.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a main part of an embodiment of the present invention, FIG. 2 is a diagram showing the relative positions of magnets 35 and 36 provided on a disk 33 and 34, and the position of the Hall element, and FIG. FIG. 4 is a diagram showing a connection state between the upper shaft and the main cam, FIG. 4 is a diagram showing a specific example of the speed switching circuit 41 and its connections, and FIGS. 5 (a) to (f) are illustrations of the deceleration operation of the electromotor, respectively. , 6 and 7 are partially enlarged views of FIG. 5(a), respectively. Applicant Tokyo Heavy Equipment Industry Co., Ltd.

Claims (1)

[Claims] A speed control device for a cycle sewing machine in which a motor, which is a power source whose rotational position can be controlled, is decelerated in two stages and then stopped, comprising a holding means for extending the time during which the motor is rotationally driven at the speed after decelerating in one stage. Speed control device for cycle sewing machines.