JPH0928968A - Sewing machine safety equipment - Google Patents

Abstract

(57) Abstract: An object of the present invention is to ensure the safety of an operator during maintenance work or the like performed with the sewing machine main body inverted. According to the present invention, a first engaging portion 10 having one end connected to a sewing machine main body 4 or a sewing machine table 4, and one end connected to a sewing machine main body 1 or a sewing machine table 4 not provided with the first engaging portion. And holding members 6, 7 having the second engaging portion 9 engaged with the first engaging portion at the other end.
8 to hold the sewing machine main body in the inverted position.

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 a sewing machine, which can be pushed down so that the lower surface of the sewing machine is exposed above the sewing machine table in order to perform maintenance work on the sewing machine body.

[0002]

2. Description of the Related Art FIG. 8 is a view showing a state in which a sewing machine main body M of a conventional industrial sewing machine is installed. In the figure, a sewing machine main body M including a sewing machine arm M1 and a sewing machine bed M2 is rotatably connected by a hinge H to one end of the sewing machine bed M2 at an edge of an opening Ta formed in a sewing machine table T. . During the sewing operation, the sewing machine bed M2 is fitted into the opening Ta formed in the sewing machine table T as shown by the alternate long and short dash line in the figure so as to maintain the vertical state as a whole. , The bed surface M2a of the sewing machine bed M2 is held on the same plane as the sewing machine table, and the lower end portion M2b of the sewing machine bed M2 faces downward. At this time, the belt B is stretched around the pulley PM of the sewing machine motor MM and the pulley PF of the upper shaft of the sewing machine with an appropriate tension.
Is properly transmitted to the sewing machine main shaft through the belt B.

When performing maintenance of the mechanism inside the sewing machine main body M, for example, adjustment of the shuttle or feed dog mechanism, replacement work, etc., first, the driving of the sewing machine motor MM is stopped,
After that, the sewing machine main body M is rotated forward around the hinge H, and is supported by the support rod T1 erected on the sewing machine table T. Thereby, the lower end portion M2 of the sewing machine bed M2
As indicated by the solid line in the drawing, b projects above the sewing machine table T, and the internal mechanism is exposed to the operator side through the opening formed in the lower end M2b. Therefore, the operator can easily perform maintenance work at the work position during the sewing operation.

[0004]

However, in the above-mentioned conventional sewing machine, since the sewing machine main body M is kept in contact with the supporting rod T1 by its own weight, there is some problem during the work. When the vibration or the pressing force is applied, the sewing machine main body M may relatively easily return to the upright position. However, if the supporting rod is shortened, the center of gravity of the sewing machine main body M in the abutting state with the supporting rod T1 can be moved forward, so that the risk of the sewing machine main body M unintentionally returning is reduced. However, in this case, a great amount of force is required for the returning operation of the sewing machine bed M2, which causes an inconvenience that the burden on the operator is increased, and the tilt angle α is increased. There is also a new problem that oil leaks from the vent holes of the oil tank housed inside. Therefore, the tilt angle α that can be set cannot be set too large, and even if the tilt angle α is set to the maximum, the backward movement of the sewing machine main body M cannot be completely prevented, so that sufficient safety is ensured. Did not come to get.

Further, in the sewing machine in which the drive of the sewing machine motor is transmitted to the main shaft of the sewing machine through the V belt as shown in the drawing, when the sewing machine main body M is inverted, the belt B is loosened as shown by the solid line in the figure. Therefore, even if the sewing machine motor MM malfunctions erroneously in this state, the sewing machine motor MM only idles with respect to the V belt B, and the driving force is not transmitted to the sewing mechanism or the like in the subsequent stage. Therefore, in the sewing machine shown in the figure, the sewing mechanism does not operate inadvertently during maintenance work, and the safety of the operator is ensured.

However, many of today's sewing machines are of a type in which a sewing machine motor is built in the sewing machine main body. In such a type of sewing machine, the sewing mechanism is activated immediately when the sewing machine motor malfunctions. Therefore, the careless operation is dangerous to a worker who is performing maintenance work.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a safety device for a sewing machine capable of ensuring the safety of a worker during maintenance work or the like performed with the sewing machine main body being inverted. And

[0008]

In order to solve the above problems, the present invention is a sewing machine in which a sewing machine table and a sewing machine main body are connected by a hinge so that the sewing machine main body can reciprocate between an upright position and an inverted position. In, the following means shall be provided. That is, the invention according to claim 1 of the present application is such that one end is connected to the first engaging portion arranged on the sewing machine body or the sewing machine table and the sewing machine body or the sewing machine table on which the first engaging portion is not provided, and the other end. A holding member having a second engaging portion that engages with the first engaging portion, and the sewing machine main body is inverted, and the first engaging portion and the second engaging portion are engaged with each other, whereby the sewing machine main body is inverted or The sewing machine body is held in the inverted position against the force of returning.

According to the second aspect of the present invention, the sewing machine motor is set in a driveable state when the sewing machine main body is in the upright position, and the sewing machine motor is set in a non-driveable state when the sewing machine main body is at least in the inverted position. The switch means is provided.

Further, the invention according to claim 3 of the present application is provided so that the position can be set between the locking position and the releasing position, the sewing machine main body is restricted to the upright position at the locking position, and the sewing machine main body can be inverted at the releasing position. And a switch means for making the sewing machine motor drivable when the engagement member is in the engagement position and for making the sewing machine motor inoperable when the engagement member is in the release position.

In the invention according to claim 1 of the present application, when performing maintenance work or the like, it suffices to engage the first engaging portion and the second engaging portion, thereby preventing the return movement and the forward movement of the sewing machine main body. Thus, the sewing machine main body is surely kept in the inverted position, so that the safety of the worker who performs the maintenance work is secured. After the work is completed, the sewing machine main body can be returned to the upright position by releasing the engagement between the first engagement portion and the second engagement portion.

According to the second aspect of the present invention, since the switch means renders the sewing machine motor inoperable when the sewing machine main body is at least in the inverted position, the sewing machine is used for maintenance work or the like in which the sewing machine is inverted. Does not drive carelessly, ensuring worker safety.

Further, in the invention according to claim 3 of the present application, when the locking member is set to the release position and the sewing machine is set in the forward movable state, the switch means sets the sewing machine motor in the inoperable state. It is possible to prevent the drive of the sewing machine motor from being carelessly performed not only during the work such as maintenance but also during the preparation stage before the work is started when the sewing machine main body is in the upright position, and the safety for the worker is further improved.

[0014]

Embodiments of the present invention will be described below. 1 to 3 are views showing a first embodiment of the present invention. In each drawing, 1 is a sewing machine main body, and this sewing machine main body 1 includes a sewing machine main shaft, a sewing needle lifting mechanism, a sewing machine arm 2 incorporating a sewing machine motor, a sewing machine hook, its rotating mechanism, and a cloth feeding mechanism. It consists of a sewing machine bed 3 that is stored. Reference numeral 4 denotes a sewing machine table that supports the sewing machine main body 1. The sewing machine table is formed with an opening 4a into which the sewing machine bed 3 of the sewing machine main body 1 is fitted in an upright state. Further, one side of the sewing machine main body 1 is connected to the edge of the opening 4a of the sewing machine table 4 by a hinge 5, so that the sewing machine main body 1 has the sewing machine bed 3 with the opening of the sewing machine table 4 as shown in FIG. The hinge 5 can be rotated about the hinge 5 from an upright position where it is fitted to the portion 4a to an inverted position shown in FIG.

Reference numeral 6 is a holding rod provided on one side surface of the sewing machine arm 2. One end 6a of the holding rod 6 is rotatably connected by a support shaft 7, and is always shown in FIGS.
As indicated by the alternate long and short dash line, the coil spring 8 is held at a position (initial position) parallel to the side surface of the sewing machine arm 2 by the urging force of the coil spring 8. A locking mechanism (second engaging part) 9 is provided at the other end of the holding rod 6.

The locking mechanism 9 includes a mounting base 9a fixed to the other end of the holding rod 6, a U-shaped hook member 9b protruding from the mounting base 9a, and an intermediate portion of the hook member 9b. An L-shaped lock link 9c having a shaft attached thereto, and a winding spring 9d that constantly biases one side portion 9c1 of the lock link 9c so as to press-contact the one side portion 9b1 of the hook member 9b. When the one side portion 9c1 of the lock link 9c is in a position (lock position) where the one side portion 9c1 of the lock link 9c is pressed against the one side portion 9b1 of the hook member 9b, the other side portion 9c2 of the lock link 9c is formed between both ends of the U-shaped member. The space to be closed is almost closed. A holding member is composed of the above 6, 7, 8, and 9.

Numeral 10 is a locking pin serving as a first engaging portion fixed on the sewing machine table 4. The locking pin 1
0 is horizontally opposed to the sewing machine table 4 with a space enough to insert the other side portion 9b2 of the hook member 9b. Reference numeral 11 denotes a micro switch as a switch means for switching a sewing machine motor, which is a drive source of the sewing machine, between a driveable state and a driveable state. The micro switch 11 is fixed to one side surface of the sewing machine arm 2, and when the holding rod 6 is in the initial position, a contact is pressed by the holding rod to set a sewing machine motor (not shown) in a drivable state.
When the holding rod rotates in the direction of arrow c from the initial position, the pressing by the holding rod 6 is released, and the sewing machine motor is set in a non-driveable state.

Next, the operation will be described based on the above configuration. When performing sewing operations, the sewing machine main body 1
The holding rod 6 is in the initial position in parallel with the sewing machine arm 2. Therefore, the sewing machine motor is in a drivable state by the micro switch 11, and by operating a sewing start lever (not shown), driving of the sewing machine motor is started and a predetermined sewing operation is executed.

On the other hand, when performing maintenance work on the sewing machine hook, the feed dog mechanism, etc., the sewing machine arm 2 is pushed by one hand in the forward movement direction (arrow a direction), and FIG.
As shown in, the sewing machine body 1 is rotated about the hinge 5 to a position where the lower surface of the sewing machine bed 3 is exposed above the sewing machine table 4 (inverted position). At the same time, with the other hand, the holding bar 6 is rotated in the direction of arrow c against the biasing force of the winding spring 8 to lock the other side portion 9b2 of the hook member 9b of the locking mechanism 9. Pin 10 and sewing table 4
Insert between

At this time, the lock link 9c of the locking mechanism is
As shown in FIG. 3, it abuts on the locking pin 10 and rotates in the arrow e direction from the lock position, but by further moving the hook member 9b forward, the lock link 9
The c is separated from the locking pin 10, rotates in the direction of the arrow f by the restoring force of the winding spring 9d, and returns to the original locked position as shown in FIG. Therefore, as shown in FIG. 2, the locking pin 10 engaged with the hook member 9b is
The other side portion 9c2 of c prevents the hook member 9b from being pulled out from between the both end portions. Therefore, the engagement state between the holding rod 6 and the sewing machine table 4 is reliably held. Therefore, in the maintenance work etc., the sewing machine main body 1
There is no danger of the robot moving back, and the safety of work is greatly improved.

Further, as described above, the engagement between the locking mechanism 9 and the locking pin 10 allows the sewing machine main body 1 to be reliably held in the inverted position, so that the inclination angle α of the sewing machine main body 1 in the inverted position is α. Can be set to the minimum value within the range where the workability of maintenance work is not hindered.
That is, the center of gravity of the sewing machine body 1 can be set as rearward as possible. Therefore, when returning the sewing machine main body 1 to the upright position, the burden on the operator can be minimized, and in the case where the sewing machine bed 3 is provided with an oil tank or the like, the oil tank It is possible to prevent the oil from leaking from the intake holes of the.

Further, in order to hold the sewing machine main body 1,
When the holding rod 6 is rotated from the initial position, the micro switch 11 renders the sewing machine motor inoperable. Therefore, even if the sewing start lever or the like is pressed by mistake during maintenance work, the sewing machine motor will not operate. It is not driven, and even in the preparatory stage before the start of work when the sewing machine body 1 is in the upright position, if the holding rod is rotated from the initial position, careless driving of the sewing machine motor can be prevented, The safety for workers can be further improved.

When the sewing machine body 1 is returned to the upright position after the maintenance work is completed, the lock link 9c is retracted from the lock position against the biasing force of the winding spring 9d, and then held. It suffices to rotate the rod 6 around the support shaft 7 and remove the hook member 9b from between the locking pin 10 and the sewing machine table 4.

By the way, in the first embodiment, even when the sewing machine main body is in the upright position, it is possible to set the sewing machine motor in the inoperable state by operating the holding rod. Not only the safety of the work performed after being inverted, but also the safety while the sewing machine main body 1 is moved from the upright position to the inverted position can be ensured. However, by changing the mounting position of the switch means or the shape of the holding rod, it is possible to set the sewing machine motor so that it cannot be driven only when the sewing machine body 1 is held in the inverted position. Even in this case, it is possible to prevent the careless driving of the sewing machine motor during the maintenance work, so that the safety is remarkably improved as compared with the conventional case.

In the first embodiment, the holding rod 6 is interposed between the sewing machine table 4 and the sewing machine arm 2, and the sewing machine main body 1 is inverted against the force applied to the holding rod 6 in the compression direction. It is designed to be held in the position shown in FIG.
The holding rod 60 is interposed between the sewing machine table 4 and the lower portion of the sewing machine body 1 as in the second embodiment shown in FIG. 1, and the sewing machine body 1 is in the inverted position against the force applied to the holding rod 60 in the compression direction or the extension direction. You may make it hold | maintain. In addition,
Contrary to the above embodiment, one end of the holding rod may be disengageable, and the other end may be rotatable. Further, both ends of the holding rod may be disengaged from both the sewing machine main body and the sewing machine table. It may be possible.

Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, similarly to the first embodiment, a slide lock as a locking member for holding the sewing machine body 1 in an upright position with respect to a sewing machine in which the sewing machine body 1 and the sewing machine table 4 are connected by a hinge 5. A micro switch (switch means) 2 for providing the member 20 and controlling the sewing machine motor according to the position of the slide lock member 20.
1, etc. are provided.

That is, the slide lock member 20
Has one end attached to the side surface of the sewing machine bed 3 by a pin 22, and an insertion hole 20a through which the pin 22 is inserted is a long hole extending in the front-rear direction, and slides within the range of this long hole. The lock member 20 can be moved. Further, a hook portion 20b to be inserted into the recess 4b of the sewing machine table 4 is formed at the other end of the slide lock member 20, and the hook portion 20b is formed.
Indicates that the slide lock member 20 is at the front locking position (in the figure,
When it is set to the position shown by the solid line), the concave portion 4b
While engaging with the engagement pin 4c provided inside, when the slide lock member 20 is in the rear release position (shown by the alternate long and short dash line in the drawing), the engagement between the hook portion 20b and the engagement pin 4c. It is supposed to be canceled.

On the other hand, the micro switch 21 is provided so as to face the front end of the slide lock member 20, and when the slide lock member 20 is in the locking position, the contact is made by the front end of the slide lock member 20. When the slide lock member 20 is pressed to set the sewing machine motor in a non-driveable state, and the slide lock member 20 is in the release position, the front end of the slide lock member 20 separates from the micro switch 21 to set the sewing machine motor in the driveable state. It is like this.

As described above, in the third embodiment,
When performing the maintenance work or the like, the sewing machine main body 1 cannot be rotated to the inversion position unless the slide lock member 20 is set to the release position, and when the slide lock member 20 is released, the micro switch 21 causes the sewing machine to move. Set the motor inoperable state. Therefore, when the sewing machine body 1 is to be tilted for maintenance work or the like, the drive of the sewing machine motor can be stopped before the sewing machine body 1 is actually tilted. Of course, when the sewing machine is moved from the upright position to the inverted position, the sewing machine motor does not operate inadvertently, and the work can be performed extremely safely.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 6 and 7. The fourth embodiment is a well-known knee support lever 3 for instructing start and stop of sewing operation by a sewing machine.
0 is a locking member that restricts the rotation of the sewing machine main body 1 to the inverted position and the return movement from the inverted position to the upright position, and as a switch means according to attachment / detachment of the knee support lever 30 as the locking member. The micro switch 33 is operated.

That is, the knee support lever 30 shown in the figure comprises a rotating shaft 31 supported on the lower surface of the sewing machine bed and a lever portion 32 attached to one end of the rotating shaft 31, and the lever portion 32 and the shaft portion. The pin 31 can be attached and detached by engaging and disengaging the pin 31a provided in the shaft part 31 and the elongated hole 32a provided in the lever part 32. Then, when the knee pad 32c of the lever portion 32 is pressed by the knee and rotated about the shaft portion 31, the presser foot (not shown) interlocked with the shaft portion 31 is raised. Further, when the sewing machine body 1 is going to be rotated forward to the inverted position in order to perform maintenance work and the like, and the lever portion 32 is attached to the shaft body 31, the lever portion 32 of the sewing machine bed 3 is Although it interferes with the lower surface, the forward rotation of the sewing machine main body 1 is blocked, but since the interference with the sewing machine bed 3 can be avoided by removing the lever portion from the shaft body, the sewing machine main body 1 can be smoothly rotated forward. .

On the other hand, the micro switch 33 is provided on the sewing machine table side, and as shown by the alternate long and short dash line in FIG. 7, when the lever portion 32 is attached to the shaft body 31, the micro switch 33 is The contact point is pressed by the collar portion 32b of the lever portion 32 to be turned on, and the sewing machine motor is set in a drivable state. And the lever part 3
When the shaft body 31 is removed from 2, the micro switch 33 is released from the pressing of the collar portion 32b against its contact and
It becomes FF, and the sewing machine motor is set in a non-driveable state.

As described above, in the fourth embodiment, when the sewing machine body 1 is to be moved to the inverted position, the knee rest lever 30 must be removed prior to this. When the knee support lever 30 is removed, the sewing machine motor becomes inoperable. Therefore, there is no risk that the sewing machine will be inadvertently operated during maintenance work and the like, and work safety is sufficiently ensured.

By the way, in each of the above-mentioned embodiments, the switch means 11, 21, or 33 is adapted to operate in accordance with the position of the holding rod 6 or the respective locking members 20, 30. The position may be directly detected using a predetermined switch means, and the driveable state and the driveable state of the sewing machine motor may be switched according to the detected position. Further, in the above embodiment, the micro switch is used as the switch means, but it is also possible to use a light sensor, a proximity switch or the like instead of the micro switch.

[0035]

As described above, in the safety device for a sewing machine according to the invention described in claim 1 of the present application, the first engaging portion arranged on the sewing machine main body or the sewing machine table and the sewing machine not provided on the first engaging portion are provided. Since one end is connected to the main body or the sewing machine table, and the other end is provided with a holding rod having a second engaging portion that engages with the first engaging portion, when performing maintenance work, etc., the holding rod is attached to the sewing machine main body. Alternatively, by engaging the sewing machine table, it is possible to prevent the sewing machine main body from moving back and forth carelessly, and it is possible to sufficiently secure the safety of the operator in maintenance work and the like.

Further, in the safety device for a sewing machine according to the second aspect of the present invention, since the sewing machine motor is set in the inoperable state at least when the sewing machine main body is in the inverted state, there is no danger that the sewing machine motor will be driven during maintenance work or the like. The safety of workers is greatly improved.

According to the third aspect of the present invention, the sewing machine main body cannot be inverted unless the locking member is moved to the release position, and the locking member is set to the release position. Since the sewing machine motor is set to be inoperable, not only when the sewing machine body is set to the inverted position but also when the sewing machine body is in the upright position, the sewing machine Driving can be prevented, and the safety for workers is further improved.

[Brief description of drawings]

FIG. 1 is a partially longitudinal side view showing a state where a sewing machine main body is in an upright position in a first embodiment of the present invention.

FIG. 2 is a partial vertical cross-sectional side view showing a state in which the sewing machine main body is held in the inverted position in the embodiment.

FIG. 3 is a partially longitudinal side view showing a state immediately before the locking mechanism is engaged with the engagement pin in the embodiment.

FIG. 4 is a partially longitudinal side view showing a second embodiment of the present invention.

FIG. 5 is a partially longitudinal side view showing a third embodiment of the present invention.

FIG. 6 is a partially longitudinal side view showing a fourth embodiment of the present invention.

FIG. 7 is an enlarged view of an essential part of what is shown in FIG. 5, (a)
Shows a bottom view and (b) shows a side view.

FIG. 8 is an explanatory side view showing an example of a safety device in a conventional sewing machine.

[Explanation of symbols]

 1 Sewing Machine Main Body 4 Sewing Machine Table 5 Hinge 6 Holding Rod 6a One End 9 Locking Mechanism (Second Engagement Part) 11 Micro Switch (Switch Means) 60 Holding Rod 20 Slide Lock Member (Locking Member) 21 Micro Switch (Switch Means) 30 Knee rest member (locking member) 33 Micro switch (switch means)

Claims (3)

[Claims] 1. A sewing machine in which a sewing machine table and a sewing machine main body are connected by a hinge so that the sewing machine main body can be set to an upright position and an inverted position, and a first engaging portion arranged on the sewing machine main body or the sewing machine table. The sewing machine main body is upside down, and is composed of a holding member having one end connected to a sewing machine body or a sewing machine table not provided with the first engagement portion and a second engagement portion engaging with the first engagement portion at the other end. By engaging the first engaging portion and the second engaging portion with each other, the safety of the sewing machine is characterized in that the sewing machine main body is held in the inverted position against the force of the sewing machine main body to invert or return. apparatus. 2. A sewing machine in which the sewing machine table and the sewing machine main body are connected by a hinge so that the sewing machine main body can be set in an upright position and an inverted position, and when the sewing machine main body is in the upright position, the sewing machine motor can be driven. A safety device for a sewing machine, comprising switch means for setting and setting the sewing machine motor in an inoperable state at least when the sewing machine main body is in the inverted position. 3. A sewing machine in which a sewing machine table and a sewing machine main body are connected by a hinge, and the sewing machine main body can be set in an upright position and an inverted position, and the sewing machine is provided with a locking position and a releasing position. At the locking position, the sewing machine body is restricted to the upright position, and at the releasing position, the sewing machine body can be inverted, and when the locking member is in the locking position, the sewing machine motor can be driven, and at the releasing position, the sewing machine motor can be driven. A safety device for a sewing machine, comprising: a switch means for making the drive impossible.