JPH0938369A - Safety device in over-edge chain-stitch sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To do a threading work or inspection work with a sense of security by a method wherein when a louver cover is opened to pass a string through a louver or to do an inspection or adjustment of the louver, electricity to a drive control circuit of a motor for driving a sewing machine is turned off. SOLUTION: If a cloth table 10 of a sewing machine (or louver cover 12) is opened, a first operation axis 14 is moved to the right by the action of a spring 18 mounted to an axial part of the axis 14 and an operation arm 24 provided on the axis 14 moves in the axial direction of the axis 14 so as to be spaced apart from a microswitch 23. As a result, an OFF signal is outputted from the microswitch and a drive stop signal is outputted from a motor drive circuit to stop a sewing machine motor. It is indicated by a stop state indicating means based on the OFF signal that the cover is opened so that the motor is stopped. When the table 10 or the louver 12 is in an opened state, the sewing machine can not be operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for an overlock stitch sewing machine, and in particular, it is impossible to operate the sewing machine when either the looper cover or the cloth base is opened, so that an operator or a sewing machine can operate. The present invention relates to a device for ensuring the safety of the moving part of the vehicle.

[0002]

2. Description of the Related Art Conventionally, in the overlock stitch sewing machine, when the thread is passed through the looper, the looper cover is opened, and when adjusting the position of the knife or releasing and returning the knife, the cloth bed is opened. In the overedged sewing machine, if the operating section of the drive motor is mistakenly operated during the above-mentioned working state, the sewing machine suddenly operates and the operator is injured, or the moving part of the sewing machine. It had a structure that could easily cause dangerous situations such as collision and damage.

[0003]

DISCLOSURE OF THE INVENTION The present invention is directed to passing a thread through a looper in an overlock stitch sewing machine, for opening the looper cover for checking the mechanism, and for adjusting the position of a knife. When at least one of the two states, in which the cloth bed is opened for the purpose of inspecting the mechanism, etc., make the sewing machine inoperable even if you operate the sewing machine operating section. The purpose of the present invention is to enable the above-mentioned various operations to be safely performed. Further, it is also a characteristic object to form the device to be extremely compact as compared with the conventional device provided with a large-scale interlocking mechanism.

[0004]

For this reason, according to the present invention, a cloth base and a looper cover are provided in a part of the machine frame of the sewing machine so as to be openable and closable, and the sewing machine is controlled to a stopped state in association with the opening and closing operation of either one. In an overlock stitch sewing machine having a safety switch for controlling, a first operating shaft rotatably supported by the sewing machine frame so as to be axially movable and rotatably supported so as to be axially movable in association with opening and closing of the cloth base. A second operating shaft and an operating arm attached to the first operating shaft and arranged at one end thereof so as to be contactable with the safety switch provided at an appropriate position of the sewing machine frame 1 are provided. In the closed state, both the looper cover and the cloth base are pressed by the operation arm to be set to the ON state, and the slide movement when the looper cover is opened causes the first operation shaft to move in the axial direction to move the operation arm. Serial safety pressure on the switch is opened is set to OFF state or the first in conjunction with the axial movement of the cloth table the second actuating shaft in response to opening operation of,
An overhang which is characterized in that the operating arm is actuated to release the pressure on the safety switch and set to the OFF state, and the sewing machine is controlled to the stopped state in conjunction with either one of the opening and closing operations. The safety device in the sewing machine has solved the problem with an extremely compact structure.

[0005]

With the above structure, when the looper cover and the cloth base are closed, the operating arm attached to the first operating arm presses the safety switch to turn it on to permit the sewing machine to start, and when the looper cover is opened, the first arm is opened. The actuating shaft is actuated to release the pressure on the safety switch of the operating arm to turn it off and prohibit the sewing machine from starting. Further, when the cloth bed is opened, the operation of the second operation axis which is linked to the opening and closing of the cloth bed is linked to the operation of the first operation axis to release the pressing of the operating arm to the safety switch and set the OFF state to prohibit the start of the sewing machine. . Further, in response to the OFF signal output of the safety switch, the means for displaying the OFF state displays the start prohibited state.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of one embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a sewing machine frame 1 is integrally configured of an upper upper machine frame 2 and a lower lower machine frame 3, and a jaw portion 4 is formed on the left side of the upper machine frame 2, A needle bar 5 and a presser bar 6 which can move vertically downward are supported in the section, and a panel 7 is provided on the front surface of the upper machine casing.
And a plurality of thread tension devices 8, 8 are provided on the panel.

A needle plate 9 is provided on the lower machine frame 3 below the needle bar 5 and the pressing bar 6 supported by the jaw 5, and the needle plate 9 is provided on the left side and front and back of the needle plate. A cloth base 10 is provided which forms a surface having substantially the same height, and the cloth base 10 is pivotally supported at the rear so as to be pivotable in the horizontal direction and is openable in the arrow A direction.

The cloth base 10 is a base 1 fixed to the lower machine frame.
1, a cloth cutting knife, a knife attachment position adjusting mechanism (neither shown), and the like are covered, and an upper surface thereof serves as a work table on which a workpiece is placed.

A panel 7 provided on the front surface of the upper machine casing 2
A lower machine frame 3 below is provided with a looper cover 12, which is supported so as to be openable by two operations of a straight direction of arrow B to the left and right and then a direction of arrow C to the front and rear. At the time of the returning movement, the looper and the looper swinging mechanism (both not shown) provided on the lower machine frame 3 are guided by the side surface of the base 11 and are covered.

FIG. 2 shows the cloth stand 10 and the looper cover 12.
2 is a state in the middle of returning, and referring to FIG. 2, a mechanical base 13 of a safety device is fixed to the base 11, and the mechanical base is capable of axial movement and rotation. A first operating shaft 14 and a second operating shaft 15 are supported, and the first operating shaft 14 has a first operating arm 16 and an operating arm 1.
7, and the first operating shaft is always urged by the spring 18 mounted on the shaft in the E direction in the axial direction and the F direction in the rotating direction in FIG. A second actuating arm 19 is fixed to the actuating shaft 15, and the second actuating shaft is constantly urged in the direction of the arrow G in the axial direction in FIG. 2 by a spring 20 mounted on the shaft.

The first actuating arm 16 is formed with an inclined surface 21 which is inclined in the axial direction of the first actuating shaft 14, and the second actuating arm 19 is provided with a second actuating shaft at a part of the arm portion. A second inclined surface 22 that is inclined in the axial direction of
When the cloth base 10 and the looper cover 12 are closed, the inclined surface and the inclined surface 21 come into contact with each other in the axial direction of the shaft portions supported by each other, and then act in the rotational direction.

A micro switch 23 is attached to the mechanism base 13 at an appropriate position. The micro switch is connected to a drive control circuit of the sewing machine, and drives the sewing machine motor to drive the sewing machine only when it is operated. Is configured to.

The operating arm 1 fixed to the first operating shaft 14
7 is provided with an arm portion 24, which operates the microswitch 23 when the first operating shaft 14 is moved in the axial direction and rotated in the rotational direction.

A push plate 28 is provided at an appropriate position of the cloth base 10.
Is provided, the push plate abuts on the end of the second operating shaft 15 when the cloth base 10 is closed, and moves the second operating shaft in the G arrow direction shown in FIG.

Since the structure of one embodiment of the present invention is as described above, when the cloth base 10 or the looper cover 12 is opened, the first operating shaft 14 or the second operating shaft 1 is opened.
5 is moved in the direction of the arrow E in the axial direction or the arrow in the direction G by the action of the springs 18 or 20 attached to the respective shaft portions, so that the operation arm 17 provided on the first operating shaft 14 is Since the first operating shaft 14 moves in the axial direction or rotates in the rotating direction, it is separated from the micro switch 23. When the operation of the micro switch is released, an OFF signal is output, a drive stop signal is output from the motor drive circuit 25, and the sewing machine motor 26 is stop-controlled. Further, based on the OFF signal, the stopped state display means 27 displays that the vehicle is in the stopped state by opening the cover.

Next, the cloth base 10 and the looper cover 1
When the two are closed together, the first operating shaft 14 is pushed by the end of the looper cover 12 and moved in the direction opposite to the arrow E, and the second operating shaft 15 is moved to the cloth base 10.
It is pushed by the pushing plate 28 and is moved in the direction of the G arrow.

As described above, when the first operating shaft 14 and the second operating shaft 15 are moved in opposite directions, the inclined surface 23 of the second operating arm 19 fixed to the second operating shaft causes the first operating shaft 14 to move. The first actuating arm 16 is contacted with the inclined surface 21 of the first actuating arm 16 and the first actuating shaft 14 and the first actuating shaft 16 are rotated in the opposite direction of the arrow F by a small amount. The arm portion 24 of the operation arm 17 operates the micro switch 23 to turn it on, and the motor drive circuit 2
An ON signal is output to 5 so that the sewing machine can be operated.

When one of the cloth base 10 and the looper cover 12 is opened, the micro switch 23 is not operated, so that the micro switch 23 is in an OFF state, and an OFF signal is output to the motor drive circuit 25 to operate the sewing machine. It becomes impossible.

That is, even when the looper cover 12 is closed and the first actuating shaft 14 is moved in the direction opposite to E, the press plate 28 of the cloth base 10 is opened when the cloth base 10 is opened. It moves in the direction opposite to G and the second operating shaft 15 moves to G
Since it moves in the opposite direction, the second operating arm 19 fixed to the second operating shaft has the first operating arm 16 fixed to the first operating shaft 14.
Since the first operating shaft 14 cannot contact the first
It is not possible to receive the acting force in the rotational direction generated by the contact between the inclined surfaces 21 and 22 of the operating arm 16 and the second operating arm 19, respectively. Therefore, the operation arm 1 fixed to the first operating shaft
The operation of the micro switch 23 by 7 is not performed.

Even when the cloth base 10 is closed, the looper cover 12 does not act on the first operating shaft 14 when the looper cover 12 is open.
The operating shaft is in the retracted position moved in the axial direction E by the action of the spring 18 (the amount of movement indicated by R in FIG. 2), and the first operating arm 16 fixed to the first operating shaft has the second operating shaft 15
Since it is not possible to abut the second operating arm 19 fixed to the first operating shaft 14, the first operating shaft 14 cannot move in the rotational direction caused by the contact of the inclined surfaces of the first operating arm 16 and the second operating arm 19 as described above. You cannot receive the acting force. Therefore, the micro switch 2 by the operation arm 17 fixed to the first operation shaft
The operation for 3 will not be performed.

Incidentally, the rotational position of the first operating arm 16 is guided by the spring 24 in the axial direction by contact with the mechanism base 13 as shown in FIG. The axial movement of the second operating arm 19 causes the abutting action of the inclined surfaces 21 and 22 to cause the first operating arm 16 to move.
Is configured to rotate against the bias of the spring 24 as shown in FIG.

[0022]

[Effect] Since the present invention has the above-described structure and action, the state in which the looper cover is opened and the knife for cutting the cloth is inspected in order to thread the looper or to inspect and adjust the looper. Since the drive control circuit of the sewing machine drive motor is de-energized when the cloth bed is opened to adjust the machine position and position, the sewing machine will not operate even if the operation section of the drive motor is operated by mistake. Since it is not operated, threading work and inspection work can be carried out with peace of mind, and the practical and safety effects are remarkably large.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 is a perspective view showing the appearance of a sewing machine incorporating the present invention, FIG. 2 is a front view showing a partial cross section of the essential part of the present invention, and FIG. 4 is an exploded front view showing a part of FIG. 2 in detail, FIG. 5 is a side view of FIG. 4, and FIG. 6 is an enlarged side view of a main part of the present invention. 7 is a side view of another embodiment of FIG. 5, FIG. 8 is an explanatory view of the operation of FIG. 7, and FIG. 9 is an operation explanatory view of the safety switch. DESCRIPTION OF SYMBOLS 1 ... Sewing machine frame 10 ... Fabric base 12 ... Looper cover 14 ... 1st operating shaft 15 ... 2nd operating shaft 16 ... 1st operating arm 19 ... 2nd operating arm 21 ... Inclined part 22 ... Inclined part 23 ... Micro switch 24 ... Operating arm

Claims (3)

[Claims] 1. An overlock stitch sewing machine, in which a cloth base and a looper cover are openably and closably provided on a part of the machine frame of the sewing machine, and a safety switch is provided to control the sewing machine to a stopped state in conjunction with the opening and closing operation of either one. A first operating shaft rotatably supported by the sewing machine frame so as to be axially movable and rotatably, a second operating shaft supported axially movably in conjunction with opening and closing of the cloth bed, and the first operating shaft. An operating arm that is attached to the shaft and is arranged so that it can contact the safety switch provided at an appropriate position of the sewing machine frame 1 at one end, and the safety switch has both the looper cover and the cloth base closed. In the ON state by being pressed by the operating arm, the first operating shaft is axially moved by the sliding movement of the looper cover when the looper cover is opened, and the operating arm releases the pressing to the safety switch. F state is set, or the first operating shaft is operated in conjunction with the axial movement of the second operating shaft in response to the opening operation of the cloth table, and the operating arm presses the safety switch. A safety device for an overedge stitch sewing machine, which is opened and set to an OFF state, and the sewing machine is controlled to be in a stopped state in synchronization with the opening / closing operation of either one. 2. An overlock stitch sewing machine, in which a cloth base and a looper cover are openably and closably provided in a part of a machine frame of the sewing machine, and a safety switch is provided to control the sewing machine to a stopped state in conjunction with opening or closing operation of either one. A first operating shaft that is rotatably supported by the sewing machine frame so as to be axially movable and rotatable, and is always positioned by one end to be in contact with the looper cover when the looper cover is closed by a spring means, and the first operating shaft is parallel to the first operating shaft. And a second actuating shaft which is rotatably blocked and supported by the sewing machine frame so as to be movable only in the axial direction, and which is always positioned by one end by spring means to abut when the cloth bed is closed. A first actuating arm which is arranged facing the shaft and has an abutting inclined portion attached to the first actuating shaft; and an abutting inclined portion which is arranged opposite the first operating shaft. A second operating arm attached to the second operating shaft; An operating arm that is attached to the first operating shaft and is arranged so as to be able to contact the safety switch provided at an appropriate position of the sewing machine frame 1 at one end, the safety switch including the looper cover and the cloth base. In the closed state, both are set to the ON state by being pressed by the operation arm due to the rotation of the first operating shaft due to the contact of the inclined portions due to the movement of the first operating shaft and the movement of the second operating shaft, and the ON state of the looper cover. The first actuating shaft 14 is axially moved by the sliding movement at the time of opening, and the operating arm releases the pressure on the safety switch to be set to the OFF state, or in association with the opening operation of the cloth base, Due to the axial movement of the second actuating shaft, the turning action of both inclined portions is released, the first actuating shaft is turned, and the operating arm releases the pressure on the safety switch and is set to the OFF state. Without Safety device in overlock stitch sewing machine and controls the sewing machine in conjunction with the stop state or in one of the opening and closing operation. 3. O for the OFF signal of the safety switch
The safety device in a lock stitch sewing machine according to claim 1 or 2, further comprising display means for displaying an FF state.