JPH1071289A - Safety device for overlock sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the interception of a motor drive circuit from being released while an opening and closing member is opened. SOLUTION: This overlock sewing machine is constituted to be provided with a front cover 4 constituting an opening and closing cover disposed to be opened and closed to a front panel 1 constituting a fixed cover covering a sewing machine body 10 provided with a motor drive circuit. In this case, a safety device is constituted from a slide detecting switch 21 having a detecting means 2 for detecting the move of the front cover 4 and the slide of the front cover 4 in the non-swaying, and constituted to intercept the motor drive circuit while the front cover 4 is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overlock sewing machine provided with an openable / closable cover which can be opened / closed with respect to a fixed cover for covering a main body provided with a motor drive circuit. Further, the present invention relates to a safety device for an overlock sewing machine including a detection unit that shuts off the motor drive circuit while the opening / closing member is open.

[0002]

2. Description of the Related Art In a conventional overlock sewing machine without a safety device, an operator turns on and off a power supply for ensuring safety when an opening / closing member is opened.

In order to avoid the troublesome operation of the operator in the conventional overlock sewing machine, a safety device of the conventional overlock sewing machine (Japanese Utility Model Laid-Open No. 5-70482).
As shown in FIGS. 9 and 10, the operating lever V is moved by utilizing the linear movement of the support shaft J of the looper cover L in the axial direction.
And a safety device that shuts off the motor drive circuit by the switch S via the switch.

[0004]

The overlock sewing machine provided with the above-mentioned conventional safety device includes the looper cover L
The motor drive circuit is interrupted by the switch S via the operation lever V by utilizing the linear movement of the support shaft J in the axial direction, so that the support shaft J of the looper cover L and the operation lever There is a problem that the stroke difference D with respect to V (FIG. 9) is large and the interruption of the motor drive circuit is released before the looper cover L is completely closed.

When the linear movement of the support shaft J in the axial direction returns to the closed position during the swinging movement of the looper cover L around the axis of the support shaft J, the looper cover L is closed before the looper cover L is completely closed. There is a problem that the interruption of the motor drive circuit is released during the swing.

The inventor of the present invention has provided an overlock sewing machine having an opening / closing cover which is provided to be able to open and close with respect to a fixed cover covering a main body provided with a motor drive circuit.
Focusing on the technical idea of the present invention that detects the movement of the opening / closing cover and shuts off the motor drive circuit while the opening / closing member is open, the research and development is repeated, and the opening / closing member is opened. The present invention has been achieved to achieve the object of shutting off the motor drive circuit without delay and preventing the motor drive circuit from being released while the opening / closing member is open.

[0007]

A safety device for an overlock sewing machine according to the present invention (a first invention according to claim 1) is provided so as to be openable and closable with respect to a fixed cover for covering a main body provided with a motor drive circuit. In an overlock sewing machine having an opening / closing cover, a movement of the opening / closing cover is detected,
While the open / close cover is open, a detecting means for shutting off the motor drive circuit is provided.

In the safety device for an overlock sewing machine according to the present invention (a second invention according to a second aspect), in the first invention, the detecting means detects a slide when the open / close cover is not swinging. It is configured by a detection switch.

In the safety device for an overlock sewing machine according to the present invention (a third invention according to a third aspect), in the second invention, the detection means is provided by a swing detection switch for detecting the swing of the open / close cover. It is configured.

In the safety device for an overlock sewing machine according to the present invention (a fourth invention according to a fourth aspect), in the first invention, the detecting means includes a reciprocating piece reciprocating in a case, and When the reciprocating member moves in the opening direction, the reciprocating piece protrudes to shut off the motor drive circuit.

[0011] In the safety device for an overlock sewing machine according to the present invention (fifth invention according to claim 5), in the fourth invention, one end is locked by the opening / closing member, and the other end is closed when the opening / closing member is closed. The end is provided with a transmission member which comes into contact with and pushes the reciprocating piece.

[0012] In the safety device for an overlock sewing machine according to the present invention (a sixth invention according to a sixth aspect), in the fourth invention, the transmission member is formed integrally with the opening and closing member.

The safety device for an overlock sewing machine according to the present invention (a seventh invention according to claim 7) includes an opening / closing cover that can be opened and closed with respect to a fixed cover that covers a main body provided with a motor drive circuit. The overlock sewing machine includes detection means for detecting a movement of the open / close cover and outputting a drive inhibition signal to a computer that controls the overlock sewing machine.

[0014]

The safety device for an overlock sewing machine according to the first aspect of the present invention having the above-described structure includes an opening / closing cover that is provided so as to be able to open and close with respect to a fixed cover that covers the main body provided with the motor drive circuit. In the overlock sewing machine, the detecting means detects the movement of the open / close cover, and shuts off the motor drive circuit while the open / close cover is open. Therefore, when the open / close member is opened, the motor drive circuit is opened. Is shut off without delay, and the effect of preventing the interruption of the motor drive circuit from being released while the opening / closing member is open is exhibited.

In the safety device for an overlock sewing machine according to a second aspect of the present invention, the slide detection switch constituting the detection means may be configured to slide the open / close cover when the open / close cover is not swinging. Is detected, and the motor drive circuit is shut off while the open / close cover is open, so that the motor drive circuit is prevented from being released from being shut off while the open / close member is open. .

In the safety device for an overlock sewing machine according to a third aspect of the present invention, the swing detection switch constituting the detection means detects the swing of the open / close cover in the first invention. When the opening and closing member is swung open, the motor drive circuit is shut off without delay.

According to a fourth aspect of the present invention, in the safety device for an overlock sewing machine according to the first aspect, the detecting means includes a reciprocating piece that reciprocates in a case.
When the opening / closing cover moves in the opening direction, the reciprocating piece projects and shuts off the motor drive circuit, so that when the opening / closing member is opened, the motor drive circuit is shut off without delay.

In the safety device for an overlock sewing machine according to a fifth aspect of the present invention, the transmission member having one end locked to the opening / closing member is provided when the opening / closing member is closed. Since the end comes into contact with and pushes in the reciprocating piece, the reciprocating piece immediately protrudes when the opening / closing member is opened, so that the motor drive circuit is shut off without delay.

In the safety device for an overlock sewing machine according to the sixth aspect of the present invention, the transmission member is formed integrally with the opening / closing member in the fourth aspect.
This has the effect of reducing the number of parts, reducing the number of assembly steps, and enabling cost reduction.

A safety device for an overlock sewing machine according to a seventh aspect of the present invention is an overlock sewing machine having an opening / closing cover which can be opened / closed with respect to a fixed cover covering a main body provided with a motor drive circuit. The detection means detects the movement of the open / close cover and outputs a drive prohibition signal to a computer for controlling the overlock sewing machine. Therefore, when the open / close member is opened by the computer, the motor drive circuit is shut off without delay. The motor drive circuit is prevented from being released while the opening / closing member is open.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention are described below.
This will be described with reference to the drawings.

(First Embodiment) As shown in FIGS. 1 to 7, a safety device for an overlock sewing machine according to a first embodiment forms a fixed cover for covering a sewing machine main body 100 provided with a motor drive circuit. In an overlock sewing machine provided with a front cover 4 constituting an openable / closable cover provided to be able to open and close with respect to the front cover 1, the detecting means 2 for detecting the movement of the front cover 4 is configured such that the front cover 4 does not swing. The front cover 4 includes a slide detection switch 21 for detecting a slide at the time.
While the is open, the motor drive circuit is shut off.

As shown in FIGS. 3 and 4, an upper looper 12, a lower looper 13, and a thread guide member communicating with the upper and lower loopers 12, 13 are provided on the lower front surface of the front panel 1 constituting a fixed cover for covering the sewing machine main body. A front cover 4 constituting an opening / closing cover for covering (not shown) is provided.

The front cover 4 includes a support shaft 6 which is thrust-stopped by E-rings 5 on bearings 4a, 4b and 4c protruding from the lower portion of the inner wall surface, and a screw 8a , 8b is supported by the front hinge 9 so as to be able to reciprocate (in the BC direction) and swing (in the DE direction).

The front hinge 9 has a guide groove 9a for allowing the front cover 4 to swing (DE) when the forward movement in the B direction is completed, and for preventing the backward movement in the C direction when swinging (DE direction). Is provided.

Inside the upper right portion of the front cover 4,
As shown in FIG. 5, there is provided a rocking stopper 4d which engages with the locking portion 1a provided on the front panel 1 and prevents the front cover 4 from rocking when the return movement in the C direction is completed. I have.

As shown in FIG. 4, the coil spring 10 is disposed between the bearing 4b and the right end of the front hinge 9 and is coaxial with the support shaft 6, and restores the front cover 4. It is configured to urge in the C direction of movement.

In the front cover 4, a knob 4e for operating the front cover is provided so as to protrude from a front wall surface of the front cover. After sliding (forward movement) in the direction B in FIG. 4 for a certain distance, it is configured to swing around the support shaft 6 and open.

As shown in FIGS. 1 and 2, the slide detecting switch 21 constituting the detecting means 2 has a switch case 20 integrally formed on the inside of the front panel 1 and a projecting portion provided on the switch case 20. The switch body 22 locked to the two fixed shafts 201 and a guide groove 202 formed in the switch case 20 are slidably held in the left-right direction in the figure, and protrude from the front panel 1. It comprises a button portion 231 at one end and a switch button 23 having a projection 232 for pressing the movable contact 221 of the switch body 22.

The switch body 22 includes the movable contact 221 pressed against the protrusion 232 of the switch button 23, and includes two electric wires 222 connected to the motor drive circuit (not shown). I have.

The button portion 231 of the switch button 23
Is a torsion spring 2 having one end locked to the switch case 20.
The other end of the motor 4 is configured to urge the drive inhibit signal to the left in the figure corresponding to the output state (the motor drive circuit is shut off).

The switch case 20 includes a mounting screw 2
6 (shown in FIGS. 6 and 7) is surrounded by a switch case cover 25 attached to the front panel 1.

As shown in FIGS. 1, 3 and 4, the front cover 4 has a transmission member having a U-shaped cross section which comes into contact with a button portion 231 projecting from the front panel 1 of the switch button 23. The switch operation part 48 is formed integrally with the button part 231 so as to protrude from the right inner wall surface facing the button part 231.

In the safety device for an overlock sewing machine according to the first embodiment having the above-described structure, when the front cover 4 is in a use state of a closed sewing machine, the bearing 4 b of the front cover 4 is connected to the front hinge 9. Upper surface 9b of
And the engagement of the locking portion 1a of the front panel 1 with the rocking stopper 4a of the front cover 4 causes the rocking of the front cover 4 and the B of the coil spring 10 to move.
Forward movement is prevented.

At this time, the switch operation part 48 formed integrally with the front cover is operated by the switch button 2.
3, the button portion 231 is pressed to maintain the motor drive circuit in a conductive state, and an operation start switch (not shown)
Is turned on, the operation of the sewing machine is started.

To open the front cover 4 as shown in FIGS. 1 and 7, when the front cover 4 is moved forward in the direction B (sliding rightward in FIG. 1), as shown in FIG. Since the engagement of the swing stopper 4d is released and the bearing 4b of the front cover 4 reaches the guide groove of the front hinge 9 and becomes swingable, the front cover 4 is then moved in the direction D shown in FIG. It is performed by swinging forward (to the lower left in FIG. 1).

In the opening operation, as soon as the front cover 4 moves forward in the direction B, the switch operating part 48 integrally formed on the front cover 4 pushes the button part 231 of the switch button 23. Is released, the protrusion 232 formed integrally with the button portion 231 moves to the left in FIGS. 1 and 2 to swing the movable contact 221 of the switch body 22 counterclockwise. Then, the switch body 22 is turned off, and the motor drive circuit connected via the electric wire 222 is shut off.

The safety device for an overlock sewing machine according to the first embodiment, which has the above-described operation, is configured such that when the front cover 4 is slid rightward in FIG. 48 releases the pressing of the button portion 231 of the switch button 23 and turns off the switch main body 22, so that the motor drive circuit is immediately shut off without delay.

In the safety device for an overlock sewing machine according to the first embodiment, when the front cover 4 is slid rightward in FIG. 1 by a predetermined amount, as shown in FIG. Is released, and the front cover 4 can be swung, so that interference with the cutting width adjustment dial 14 can be avoided.

Further, in the safety device for an overlock sewing machine according to the first embodiment, when the front cover 4 is in a use state of a closed sewing machine, the bearing 4b of the front cover 4 is fixed to the upper surface 9b of the front hinge 9. The engagement between the locking portion 1a of the front panel 1 and the swing stopper 4a of the front cover 4 allows the front cover 4
Of the coil spring 10 and the forward movement of the coil spring 10 in the direction B are prevented, so that the motor drive circuit in use is prevented from being shut off.

In the safety device for an overlock sewing machine according to the first embodiment, when the front cover 4 is slid rightward in FIG. 1, the motor drive circuit is immediately shut off, and the front cover 4 is moved to the position shown in FIG. After being swung in the direction E to be closed, the motor drive circuit is slid in the direction C and immediately before the front cover 4 is completely closed, so that the motor drive circuit is conducted. In addition to the effect of shutting off the motor drive circuit, it is possible to prevent the motor drive circuit from being released from being shut off while the opening / closing member is open.

Further, in the safety device for an overlock sewing machine according to the first embodiment, since the switch operation section 48 is formed integrally with the front cover 4, the number of parts is small, the number of assembly steps is reduced, and the cost is reduced. This has the effect of allowing downing.

(Second Embodiment) A safety device for an overlock sewing machine according to a second embodiment controls the interruption of the motor drive circuit by sliding the front cover 4 in the first embodiment. As shown in FIG. 8, the detecting means is constituted by a swing detection switch 27 for detecting the swing of the front cover 4 and controlling the shutoff of the motor drive circuit.

The front cover 4 in the second embodiment
Is notched 407 at the left end so as to avoid interference with the cut width adjustment dial 14 projecting laterally from the right side wall of the lower left end projection 107 of the front panel without sliding to the right in the figure. Is formed large,
A mechanism associated with the slide in the first embodiment is omitted.

The sway detection switch 27 is a sensor which is the same as the slide detection switch 21 of the first embodiment.
Is connected to the computer 3 for controlling the overlock sewing machine. The swing detection switch 27 detects the swing of the front cover 4, and the drive detection signal is output from the swing detection switch 27. Then, the computer 3 cuts off the motor drive circuit.

In the safety device for an overlock sewing machine according to the second embodiment having the above structure, when the swing detecting switch 27 constituting the detecting means 2 is swung to open the front cover 4, Since the pressing by the switch operating unit 48 is released, the swing of the front cover 4 is immediately detected, so that the motor drive circuit is shut off without delay.

In the safety device for an overlock sewing machine according to the second embodiment, the swing detection switch 27 detects the swing of the front cover 4 and inhibits the computer 3 that controls the overlock sewing machine from driving. Since the signal is output, the overall control by the computer 3 has an effect of preventing the motor drive circuit from being released from being shut off while the front cover 4 is open.

Further, the safety device for the overlock sewing machine according to the second embodiment can omit the mechanism associated with the slide in the first embodiment, and thus has the effect of simplifying the mechanism and facilitating maintenance. .

Since the safety device for the overlock sewing machine according to the second embodiment is controlled by the computer 3, it is possible to control the overlock sewing machine together with various signals for controlling the overlock sewing machine. Since the control conditions can be easily changed by changing the software, there is an effect that a flexible system is realized.

The above-described embodiments have been described by way of example only, and the present invention is not limited to these embodiments. Those skilled in the art will recognize from the claims, the detailed description of the invention, and the drawings. Modifications and additions are possible without departing from the technical idea of the present invention.

[Brief description of the drawings]

FIG. 1 is a partial side view showing a main part of a safety device of an overlock sewing machine according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view illustrating a detecting unit according to the first embodiment.

FIG. 3 is a front view showing the entire safety device of the overlock sewing machine according to the first embodiment.

FIG. 4 is a partial front view showing the safety device of the first embodiment.

FIG. 5 is a partially enlarged cross-sectional view illustrating a swing prevention mechanism according to the first embodiment.

FIG. 6 is a partially cutaway bottom view showing a state before sliding of the slide mechanism in the first embodiment.

FIG. 7 is a partially cutaway bottom view showing a state after sliding of the slide mechanism in the first embodiment.

FIG. 8 is a front view showing the entire safety device of the overlock sewing machine according to the second embodiment of the present invention.

FIG. 9 is a partially enlarged view showing a state before and after sliding of the safety device of the conventional overlock sewing machine.

FIG. 10 is a partially enlarged view showing an operation lever and a switch of the safety device of the conventional overlock sewing machine.

[Explanation of symbols]

 100 Sewing machine body 1 Front panel 2 Detecting means 4 Front cover 21 Slide detection switch

Claims (7)

[Claims] 1. An overlock sewing machine having an openable / closable cover provided to be openable and closable with respect to a fixed cover for covering a main body provided with a motor drive circuit, wherein a movement of the openable / closable cover is detected to detect the movement of the open / closed cover. A safety device for an overlock sewing machine, comprising: detection means for shutting off the motor drive circuit while is open. 2. The safety device for an overlock sewing machine according to claim 1, wherein said detection means is constituted by a slide detection switch for detecting a slide when the opening / closing cover does not swing. 3. The safety device for an overlock sewing machine according to claim 2, wherein said detecting means is constituted by a swing detection switch for detecting the swing of said opening / closing cover. 4. The motor control circuit according to claim 1, wherein the detecting means includes a reciprocating piece that reciprocates in the case, and the reciprocating piece projects to shut off the motor drive circuit when the opening / closing cover moves in an opening direction. A safety device for an overlock sewing machine, wherein the safety device is configured. 5. The apparatus according to claim 4, further comprising a transmission member having one end locked to the opening / closing member and the other end contacting and pushing the reciprocating piece when the opening / closing member is closed. Safety device for overlock sewing machine. 6. The safety device for an overlock sewing machine according to claim 4, wherein the transmission member is formed integrally with the opening / closing member. 7. An overlock sewing machine having an open / close cover that is openably and closably disposed with respect to a fixed cover that covers a main body portion having a motor drive circuit, wherein the movement of the open / close cover is detected to detect the movement of the open / close cover. A safety device for an overlock sewing machine, comprising: a detection unit that outputs a drive inhibition signal to a computer that controls the sewing machine.