JPS61226096A - 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] This invention relates to a cycle sewing machine in which the main shaft of the sewing machine, which is in a high-speed driving state, is temporarily brought into a low-speed driving state and then stopped before the IN cycle sewing machine is started. This invention relates to a drive control device.

[Conventional technology]

Conventionally, a drive control device in a cycle sewing machine, for example, a hole sewing machine, has a deceleration device installed on the main cam in order to operate the knife, force the sewing machine to almost the dead center, and stop it without firing. Cam and stop F Activate the cam to switch the speed and stop 1. The rotation speed of the motor is controlled by the x switch, and the main shaft of the sewing machine, which is running at high speed, is set to - just before the end of the IN cycle.
1. The motor is brought into a low speed driving state and then stopped 1-.

The high-speed drive is performed at a set number of revolutions; for example, in order to prevent heat loss, fabrics such as fabrics are sewn at a lower set number of revolutions.

However, the rotation speed in low-speed drive is a predetermined constant rotation speed regardless of the set high-speed drive rotation speed, and the number of stitches required for one sewing cycle, that is, the number of stitches required for one rotation of the main cam, is The number of buttons to be formed is set by appropriately changing the gear ratio of the numerical aperture changing gear.

[Problem that the invention seeks to solve]

In conventional cycle sewing machines, the number of rotations from high-speed drive to deceleration and stop is constant due to the nature of cycle sewing machines, so the lower the rotation speed in high-speed drive, the shorter the time required to sew one cycle. It took a long time, and work efficiency decreased.

Therefore, the present invention attempts to solve the above-mentioned problem by extending the high-speed drive according to the set rotational speed of the high-speed drive, etc., and shortening the time required for one sewing cycle.

[Means for solving problems]

The drive control device for a cycle sewing machine according to the present invention includes a calculation means for calculating a delay time for starting deceleration with respect to a rotational speed of high-speed driving at a set rotational speed, in order to make the low-speed driving time constant; A switching means for switching from high-speed drive to low-speed drive based on time is provided.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 3.

2, 1 is a shaft rotatably supported on the sewing machine frame 2, 3 is a drive pulley fixed to the upper shaft 1, and 4 is a drive pulley fixed to the 1 shaft. The worm gear 5 is a worm wheel fixed to one end of a shaft 6 provided in a direction perpendicular to the L axis, and is engaged with the worm gear 1 and the gear 4. 7 is a shaft that can be attached and detached from the other end of this shaft 6, 8 is a shaft that is parallel to the shaft 6, and 9 is a shaft that can be attached and detached from one end of this shaft 8.
The gold 1 number change tooth 1j attached to the f function meshes with the southeast 7. lO is iE fixed to the other end of this shaft 8.
The cam drive tooth +1jll is a main cam that meshes with the main cam drive weight 10, and rotates once every l sewing cycle, and the cam provided on the ten cam 11 performs the movements necessary for rotation of the sewing machine during one sewing cycle, for example. A cloth feed arm connected to a cloth feed mechanism is reciprocated in accordance with the groove of a heart groove cam provided on the surface of the cam 11 to feed sewing. By appropriately replacing the side number changing tooth weights 7 and 9, the rotation ratio of the main cam 11 with respect to the L axis I is changed. 12.13
are a speed change cam and a cutoff cam provided on the surface of this E cam 11, respectively; 14 is a hook pull lever whose central portion is pivotally supported on the sewing machine frame 2; A protrusion 15 that engages with the cam 12 and the cutoff cam 13 is provided, and a hook portion 16 is provided at the other end. A lever 17 is pivotally supported by a support 18 provided on the sewing machine frame 2, and is biased counterclockwise by a spring 19 stretched between the central portion of the lever 17 and the sewing machine frame 2. Reference numeral 20 denotes a locking projection provided at one end of the aforementioned hook removal lever 14, which engages with the hook portion 16 provided at one 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 operates the speed changeover switch 22 and the stop switch 2 depending on the engagement state of the protrusion 15 with the speed change cam 12 and the cutoff cam 13.
3 is controlled 0N10FF. Reference numeral 24 denotes an L-shaped starting link. A part of this elbow is rotatably supported by a support 25 provided on the sewing machine frame 2, and 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 is rotated clockwise.

Reference numeral 30 designates an electromotor 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
33 is a needle position detection device, 34 is a control device, which controls the electromotor 30 at a preset rotational speed based on signals from the speed detection device 32 and the speed changeover switch 22. The rotation is controlled based on the signal from the stop I switch 23. 35 is electro motor 30
Knob for setting the rotation speed when driving at high speed.
Reference numeral 36 denotes a microcomputer as a calculating means for calculating the time for high-speed driving at a set rotational speed and means for delaying the timing of switching to low-speed driving by that time.

Next, the operation will be explained based on the flowchart in FIG.

Now, the stop l switch 23 is pressed to the stop 1 position by the switch push plate 21 because the protrusion 15 of the hook release lever 14 is in contact with the cutoff cam 13.
state.

(1) In this state IE, when the starting pedal 27 is operated and rotated in the direction of the dial, the starting link 24 is connected via the rod 26.
is rotated counterclockwise, and the protrusion 28 is pressed against the protrusion 29. Then, the switch is rotated in the 1 direction, and the switch push plate 21 is stopped. Move away from the switch 23, press the speed changeover switch 22, turn off the stop switch 23, and turn on the switch 22 (STEP
-1 to 5TEP-2). When the switch 23 is turned off, the electromotor 30 rotates (low-speed drive), and when the switch 22 is turned on, the electromotor 30 rotates at a high speed (5TEP-3), so that the main shaft l rotates.

As the upper shaft l rotates, the worm gear 4, the worm wheel 5, the shaft 6, the stitch number changing gear 7, 9, . The tocam 11 rotates via the shaft 8 and the main cam drive gear 10, and the protrusion 15 of the hook removal lever 14 is separated from the cutoff cam 13. At this time, the hook portion 16 engages with the surface portion 20b of the engagement protrusion 20b, and even if the starting pedal 27 is returned to its original position, the hook portion 16 and the engagement protrusion 20b remain engaged.
The lever 17 remains in the same position IE, and sewing continues. -・way.

When the switch 22 is turned on, the microcomputer 36
Then, the speed detection device 32 starts measuring the rotational speed.

(2) Subsequently, sewing is performed by high-speed driving, and when the protrusion 15 of the hook removal lever 14 comes into contact with the cam 12, the hook removal lever 14 slightly rotates in the opposite direction A1, and the hook portion 16 Engagement protrusion 20b of lever 17
The engagement position with the surface portion 20c is shifted and the surface portion 20c is engaged with the surface portion 20c. and,
Since the lever 17 rotates counterclockwise in response to the shift in the locked position, the switch press plate 21 separates from the switch 22 and turns off the switch 22 (STEP-4).

(3) When the switch 22 is turned off as described in (2) above, the microcomputer 36 performs high-speed drive based on the high-speed drive rotational speed detected by the speed detection device 32 and the predetermined low-speed drive time and deceleration drive time. time (x)
Calculate (STEP-5). Then, X seconds after the speed changeover switch 22 is turned OFF, the control device 34 changes the electromotor 30 from high speed drive to low speed drive as shown in FIG. 4 based on the deceleration signal output from the microcomputer 36. Decelerate (STEP 76).

(4) The electromotor 30 is driven at a low speed (for example, 900 rpm) depending on the engagement state of the protrusion 15 and the speed change cam 12.
), and when the protrusion 15 comes into contact with the cutoff cam 13, the hook part 1
6 and the engagement protrusion 20c are disengaged, and the lever 17 is moved by the elastic force of the lever 19.

On the other hand, it is rotated in the direction of the needle. For this reason, the stop switch 23
is turned on (STEP-7), and the rotation of the electromotor 30 is stopped. At this time, the sewing machine needle is stopped at the -L dead center by the nail position detection device 33. At this time, the working time required for the IM manufactured cycle is reduced by time T as shown in FIG. 4 compared to the conventional one. Due to the nature of cycle sewing machines, both the conventional and the present embodiment have the same number of 4 (the area surrounded by the graph is the number 4). Therefore, if the delay time
Although it is calculated when the speed detection device 3 is turned off,
The high-speed drive time X calculated in advance based on the rotation speed detected by 2 may be stored in a ROM in the computer as a table, and 1 may be read out when the switch 22 is turned off.

〔Effect of the invention〕

This invention is configured to delay the time required to switch from high-speed drive to low-speed drive according to the high-speed drive rotational speed after the speed change-over switch is activated, whereas conventionally the speed changeover switch was used to switch from high-speed drive to low-speed drive. In other words, the low-speed drive time can be made constant according to the rotational speed during high-speed drive, and the drive time during high-speed drive can be extended, which has the effect of shortening the time required for one sewing cycle.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing one embodiment of the present invention, Fig. 2 is a side view showing the state of connection between the upper shaft and the main cam, Fig. 3 is an operation flowchart of this embodiment, and Fig. 4 is a conventional one. It is a graph which shows the main part of the relationship between spindle rotation speed and cycle time of a present Example.

Claims (1)

[Claims] In a speed control device for a cycle sewing machine, the sewing machine main shaft is driven at a high speed at a set rotational speed during one sewing cycle, then driven at a low speed at a predetermined constant rotational speed, and then stopped. In order to keep the rotation speed constant, the motor includes a calculation means for calculating a delay time for starting deceleration with respect to a rotation speed of high-speed drive at a set rotation speed, and a switching means for switching from high-speed drive to low-speed drive based on the calculated time. A speed control device for cycle sewing machines.