JP3633676B2 - Safety device in edge stitch machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for an edge stitch sewing machine, and in particular, when either one of a looper cover and a cloth base is opened, the sewing machine cannot be operated and the operator or the moving part of the sewing machine is made safe. It relates to the device.
[0002]
[Prior art]
Conventionally, in the edge overlock sewing machine, the looper cover is opened when passing the thread through the looper, and the cloth base is opened when the position of the knife is adjusted and the knife is released and returned. Then, if the operating part of the drive motor is mistakenly operated during the above-mentioned working condition, the sewing machine suddenly operates and the operator is injured or the moving part of the sewing machine collides and breaks. It had a structure that could easily cause dangerous situations.
[0003]
[Problems to be solved by the invention]
The present invention provides a cloth bed for adjusting the position of a knife or for inspecting a mechanism in order to pass a thread through the looper or to inspect the mechanism in an edge stitch sewing machine. When the sewing machine is in at least one of the two states, the sewing machine cannot be operated even if the sewing machine operation section is operated. It aims to be able to carry out.
In addition, it is a characteristic object that it is formed in a very compact size as compared with the conventional one having a large interlocking mechanism.
[0004]
[Means for Solving the Problems]
In the present invention, for adjusting the position of the knife, a cloth base that is pivotally supported behind the sewing machine frame and rotated in the direction of the horizontal arrow A so as to be openable to the sewing machine frame, and a thread to the looper are provided. A looper cover provided on the front surface of the sewing machine frame 2 for passing therethrough and supported so as to be openable in a linear direction of arrow B opposite to the opening direction of the cloth base; and at least one of the looper cover and the cloth base An edge sewing machine with a single safety switch that stops the operation of the motor that drives the sewing machine based on the detection of the opening operation of the cloth table or the looper cover when the machine is opened. A first shaft portion that moves in the axial direction is provided by opening and closing the looper cover for movement in the axial direction that is the direction of the arrow B, and is pivoted in the direction of the horizontal arrow A that is pivotally supported behind the sewing machine frame. Opening and closing movement A second shaft portion that moves in the axial direction is provided by the operation, and the first shaft portion and the second shaft portion are engaged with each other by an inclined surface formed on an arm portion fixed to the shaft portion. The shaft on the moving side is rotated with respect to the axial movement of at least one of the shafts, and the safety switch is operated by the rotation of the first shaft or the second shaft. The problem has been solved by providing a safety device for an edge stitch sewing machine characterized by controlling the sewing machine to a stopped state.
Furthermore, the present invention provides a cloth base that is pivotally supported in the direction of the horizontal arrow A so as to be opened in the sewing machine frame and is threaded to the looper so as to adjust the position of the knife. A looper cover that is provided on the front surface of the sewing machine frame 2 so as to pass therethrough and is supported so as to be openable in the direction indicated by the arrow B, which is opposite to the opening direction of the cloth base, and at least one of the looper cover and the cloth base An edge-stitched sewing machine having a single safety switch for stopping operation of a motor for driving a sewing machine based on detection of opening operation of a cloth table or a looper cover when one of them is opened, Is provided with a first shaft portion that moves in the axial direction by opening and closing the looper cover for movement in the axial direction that is in the direction of the arrow B, and is pivotally supported behind the sewing machine frame and rotated in the direction of the horizontal arrow A. Cloth bed A second shaft portion that moves in the axial direction by a closing operation is provided, and the first shaft portion and the second shaft portion engage with each other inclined surfaces formed on arm portions fixed to the shaft portion. Then, with respect to the axial movement of at least one of the shaft portions, the shaft portion on the moving side is rotated, and the safety switch is operated by the rotation of the first shaft portion or the second shaft portion. Thus, the problem has been solved by providing a safety device for an edge stitch sewing machine characterized by switching the sewing machine to a stopped state.
Furthermore, the present invention has solved the problem by providing a safety device for an edge stitch sewing machine characterized by comprising display means for displaying an OFF state by an OFF signal of the safety switch.
[0005]
[Action]
With the above configuration, 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 allow the sewing machine to start, and when the looper cover is opened, the first operating shaft is The operation is released to release the pressing of the operating arm to the safety switch, and the start of the sewing machine is prohibited by turning it off. Further, when the cloth base is opened, the first working shaft is interlocked with the operation of the second working shaft that is interlocked with the opening and closing of the cloth base to release the pressure on the safety switch of the operating arm, thereby prohibiting 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 prohibition state.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The structure of an embodiment of the present invention will be described below with reference to the drawings.
In FIG. 1, a sewing machine frame 1 is integrally composed of an upper upper machine frame 2 and a lower lower machine frame 3, and the upper machine frame 2 has a jaw 4 formed on the left side. A needle bar 5 and a presser bar 6 that can move up and down are supported on the part, and a panel 7 is provided on the front surface of the upper machine frame, and a plurality of thread tension devices 8 and 8 are provided on the panel. Is provided.
[0007]
A needle plate 9 is provided on the lower machine frame 3 below the needle bar 5 and the presser bar 6 supported by the jaw 5, and has a height substantially equal to the upper surface of the needle plate on the left side and the front and rear of the needle plate. A cloth table 10 is provided to form a surface of the sheet, and the cloth table is pivotally supported at the rear so that it can be rotated in the horizontal direction and is openable in the direction of the arrow A.
[0008]
The cloth base 10 covers a cloth cutting knife and a knife attachment position adjusting mechanism (both not shown) provided on a base 11 fixed to the lower machine frame, and an upper surface for placing a workpiece to be sewn. It has become a work table.
[0009]
The lower machine frame 3 below the panel 7 provided on the front surface of the upper machine frame 2 is provided with a looper cover 12, which firstly moves in the straight direction of the B arrow to the left and right, and then turns in the direction of the C arrow to the front and rear. The looper and the looper swing mechanism provided in the lower machine frame 3 (both shown in the figure) are guided by the side surface of the base 11 during the return movement. (Not shown).
[0010]
FIG. 2 shows a state in which the cloth base 10 and the looper cover 12 are in the process of returning. A mechanism base 13 of a safety device is fixed to the base 11 with reference to FIG. A first operating shaft 14 and a second operating shaft 15 that can move and rotate in the axial direction are supported, and a first operating arm 16 and an operating arm 17 are fixed to the first operating shaft 14. The first operating shaft is always urged by the spring 18 mounted on the shaft in the direction of the arrow E in the axial direction and the direction of the arrow F in the rotational direction in FIG. Two operating arms 19 are fixed, and the second operating shaft is always urged in the direction of the arrow G in the axial direction in FIG. 2 by a spring 20 mounted on the shaft.
[0011]
The first operating arm 16 is formed with an inclined surface 21 that is inclined in the axial direction of the first operating shaft 14, and the second operating arm 19 is part of the arm portion in the axial direction of the second operating shaft. A second inclined surface 22 is formed, and the second inclined surface and the inclined surface 21 are in contact with each other in the axial direction of the shaft portions that are supported by each other when the cloth base 10 and the looper cover 12 are closed. Acting in the direction of rear rotation.
[0012]
A micro switch 23 is attached to the mechanism base 13 at an appropriate position, and the micro switch is connected to a drive control circuit of the sewing machine so that the sewing machine motor is driven to operate the sewing machine only when operated. It is configured.
[0013]
The operating arm 17 fixed to the first operating shaft 14 is provided with an arm portion 24, and the arm portion is moved when the first operating shaft 14 is moved in the axial direction and rotated in the rotating direction. The micro switch 23 is operated.
[0014]
A push plate 28 is provided at an appropriate position of the cloth base 10, and the push plate abuts against an end of the second operation shaft 15 when the cloth base 10 is closed, and the second operation shaft. Is moved in the direction of arrow G shown in FIG.
[0015]
Since the structure of an 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 15 is attached to each shaft portion. Since the spring 18 or 20 is moved in the direction of the E arrow in the axial direction or the arrow in the G direction by the action of the spring 18 or 20, the operating arm 17 provided on the first operating shaft 14 moves in the axial direction of the first operating shaft 14. Or is rotated away from the microswitch 23. When the operation of the microswitch 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 controlled to stop. Based on the OFF signal, the stop state display means 27 displays the stop state by opening the cover.
[0016]
Next, when both the cloth base 10 and the looper cover 12 are closed, 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 It is pushed by the push plate 28 of the cloth base 10 and moved in the direction of arrow G.
[0017]
As described above, when the first operating shaft 14 and the second operating shaft 15 are moved in directions opposite to each other, the inclined surface 23 of the second operating arm 19 fixed to the second operating shaft is fixed to the first operating shaft 14. The operating arm 17 fixed to the first operating shaft 14 is in contact with the inclined surface 21 of the first operating arm 16 and rotates the first operating shaft 14 with the first operating arm 16 in the direction opposite to the arrow F. The arm 24 operates the micro switch 23 to turn it on, and outputs an ON signal to the motor drive circuit 25 to make the sewing machine operable.
[0018]
When either 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 turned off, and an OFF signal is output to the motor drive circuit 25 so that the sewing machine cannot be operated. It becomes a state.
[0019]
That is, even when the looper cover 12 is closed and the first operating shaft 14 is moved in the direction opposite to E, the cloth table push plate 28 is opposite to G when the cloth table 10 is opened. Since the second operating shaft 15 moves in the direction opposite to G, the second operating arm 19 fixed to the second operating shaft contacts the first operating arm 16 fixed to the first operating shaft 14. Therefore, the first operating shaft 14 cannot receive the rotational force generated by the contact of the inclined surfaces 21 and 22 of the first operating arm 16 and the second operating arm 19, respectively. For this reason, the operation of the microswitch 23 by the operation arm 17 fixed to the first operating shaft is not performed.
[0020]
Even when the cloth base 10 is closed, when the looper cover 12 is opened, the looper cover does not act on the first operating shaft 14, so the first operating shaft is moved in the axial direction E by the action of the spring 18. The first operating arm 16 fixed to the first operating shaft is in contact with the second operating arm 19 fixed to the second operating shaft 15 (the amount of movement indicated by R in FIG. 2). Therefore, as described above, the first operating shaft 14 cannot receive the rotational force generated by the contact of the inclined surfaces of the first operating arm 16 and the second operating arm 19. For this reason, the micro switch 23 is not operated by the operating arm 17 fixed to the first operating shaft.
[0021]
The rotational position of the first operating arm 16 is abutted against the mechanism base 13 by a spring 24 as shown in FIG. The first operating arm 16 is configured to rotate as shown in FIG. 8 against the urging of the spring 24 by the contact action of the inclined surfaces 21 and 22 by the axial movement of the second operating arm 19.
[0022]
【effect】
Since the present invention has the structure and operation as described above, the looper cover is opened to pass the thread through the looper or the looper is inspected and adjusted, and the cloth cutting knife is inspected and positioned. Since the drive control circuit of the drive motor for the sewing machine is cut off when the cloth base is opened for adjustment, the sewing machine will not be driven even if the drive motor operation section is accidentally operated. The threading operation and the inspection operation can be performed with peace of mind, and the practical and safety effects are significantly increased.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention, FIG. 1 is a perspective view of an external appearance of a sewing machine incorporating the present invention, FIG. 2 is a front view showing a main part of the present invention in a partial cross section, and FIG. 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 the 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 ... Base 12 ... Looper cover 14 ... 1st action shaft 15 ... 2nd action shaft 16 ... 1st action arm 19 ... 2nd action arm 21 ... Inclination part 22 ... Inclination part 23 ... Micro switch 24 ... Operation arm

Claims (3)

To adjust the position of the knife, it is supported behind the sewing machine frame and rotated in the direction of the horizontal arrow A so that it can be opened in the sewing machine frame. The sewing machine is used to pass the thread through the looper. When a looper cover is provided on the front surface of the machine frame 2 and supported so as to be openable in the direction of the arrow B opposite to the opening direction of the cloth base, and at least one of the looper cover and the cloth base is opened An edge-stitched sewing machine having a single safety switch for stopping the operation of the motor for driving the sewing machine based on the detection of the opening operation of the cloth table or the looper cover, wherein the machine frame has a B-arrow linear direction A first shaft portion that moves in the axial direction by an opening / closing operation of the looper cover that moves in the axial direction is provided, and is supported by a back of the sewing machine frame and rotated in a horizontal A arrow direction. By opening and closing operation A second shaft portion that moves in a direction is provided, and at least one of the first shaft portion and the second shaft portion is engaged with each other by an inclined surface formed on an arm portion fixed to the shaft portion. With respect to the axial movement of one of the shaft portions, the shaft portion on the moving side is rotated, and the safety switch is operated by the rotation of the first shaft portion or the second shaft portion to stop the sewing machine. A safety device for an edge stitch sewing machine characterized by being controlled to a state. To adjust the position of the knife, it is supported behind the sewing machine frame and rotated in the direction of the horizontal arrow A so that it can be opened in the sewing machine frame. The sewing machine is used to pass the thread through the looper. When a looper cover is provided on the front surface of the machine frame 2 and supported so as to be openable in the direction of the arrow B opposite to the opening direction of the cloth base, and at least one of the looper cover and the cloth base is opened An edge stitch sewing machine with a single safety switch that shuts down the operation of the motor that drives the sewing machine based on detection of the opening motion of the cloth table or looper cover,
The machine frame is provided with a first shaft portion that moves in the axial direction by opening and closing the looper cover that moves in the direction of the arrow B, which is a linear direction of the arrow B. A second shaft portion that moves in the axial direction is provided by opening and closing operation of the cloth base rotated to the first and second shaft portions, and an arm portion fixed to the shaft portion is formed on the first shaft portion and the second shaft portion. By engaging the inclined surfaces with each other, the moving shaft portion is rotated with respect to the axial movement of at least one of the shaft portions, and the first shaft portion or the second shaft portion is rotated. A safety device for an edge stitch sewing machine, wherein the safety switch is operated by rotation to switch the sewing machine to a stopped state. 3. A safety device for an edge stitch machine according to claim 1, further comprising display means for displaying an OFF state by an OFF signal of the safety switch.

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