JPH1021793A - Actuator mechanism for safety switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the operation of a safety switch unrelated to the will of a worker by providing an operation plate on a door face which moves in a different direction from the opening and closing direction of a door and disengage the contact part of the safety switch on a wall side. SOLUTION: In a safety switch 20 provided at the doorway of a dangerous area where a machine is installed, first of all, a door 10 is closed, a gate bar 3 is moved to a switch 20 side so as to engage with a metal fitting 35 on a wall 12. Then, the tip of a working plate 2 is interposed inside the switch 20 via slide plate 6, and is engaged with a cam wheel 22 so as to rotate the same. The rod 23 is moved so that the moving side contact 24 at its tip is brought into contact with a fixed side contact 25 so as to be in an ON state. The wheel 22 is brought into a lock state by a lock member 26, and simultaneously the machine is operated on receipt of an ON signal. Like this, the switch 20 is operated just after a workman operates the gate bar 3 so that the operation unrelated to the will thereof can surely be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator mechanism for operating a safety switch provided at an opening / closing portion of a door.

[0002]

2. Description of the Related Art For example, in a factory, a safety switch which is turned on and off in accordance with an open / closed state of a door is provided at an entrance in a danger zone where an industrial machine which is automatically operated is installed.

As shown in the schematic plan view of FIG. 9, a conventional safety switch 100 is provided on a wall 110 side, and a safety switch 10 is mounted on a door 111 which can be turned in the direction of an arrow.
An operation plate 112 that can be inserted and removed is installed in the 0 slit 101.

When the operator closes the door 111 from the state shown in FIG. 9, the operating plate 112 is inserted into the slit 101 of the safety switch 100. Then, the operation unit in the safety switch 100 is driven to turn on the contact point. Upon receiving the ON signal, the operation of the internal machine is restarted.

Conversely, when the operator opens the door 111, the operation section in the safety switch 100 returns to the original position, and the contact is turned off.
At F, the operation of the internal machine is stopped in response to the OFF signal. Thus, it is possible to prevent an accident in which an operator comes into contact with a movable part of the machine at the time of maintenance and inspection of the machine or the like, thereby ensuring the safety of the operator.

[0006]

In the above-mentioned conventional configuration,
Because the safety switch is activated in conjunction with the movement of the door, the door may be accidentally closed regardless of the intention of the operator who opened the door, for example, due to wind pressure or due to the error of another operator. If this happens, a situation may occur in which the safety switch is easily turned on and the internal machine starts operating.

[0007] At this time, if an operator remains inside, there is a risk of contact with a movable part of the machine, which is very dangerous. In particular, in the case of a pivotable door, such a problem is likely to occur because the door is easily closed with a relatively small force.

The present invention has been made in view of such a conventional situation, and is an actuator for a safety switch which can prevent a safety switch provided at an opening / closing portion of a door from operating regardless of a worker's intention. The purpose is to provide a mechanism.

[0009]

According to a first aspect of the present invention, there is provided an actuator mechanism for a safety switch for operating a safety switch disposed on an opening / closing portion of a door, wherein the opening / closing direction of the door is different. , An operating plate for connecting and disconnecting the contact portion of the safety switch on the wall side is provided on the door surface.

According to a second aspect of the present invention, in the actuator mechanism for a safety switch according to the first aspect, the door is a pivotable door, and the operating plate is slidably supported on the door surface. On the door surface, there is provided a bar member for integrally sliding the operation plate when the door is moved.

According to the first aspect of the present invention, in order to electrically connect the contact portion of the safety switch by the operation plate provided on the door surface, the operation plate must be moved in a direction different from the opening and closing direction of the door. Must. That is, simply closing the door does not cause the operation plate to operate the safety switch, and the contact portion of the safety switch is turned ON only when the operator moves the operation plate in a direction different from the opening and closing direction of the door.

Therefore, even when the door is accidentally closed, the safety switch is not turned on in conjunction with the movement of the door, and it is possible to prevent the safety switch from being operated regardless of the intention of the operator. As a result, the safety switch can always be operated at an appropriate time.

Conversely, even if a third person accidentally tries to open the door when the safety switch is ON, the moving direction of the operating plate is different from the opening / closing direction of the door, so that it is linked to the movement of the door. As a result, the safety switch is not turned off, and similarly, the safety switch can be prevented from operating regardless of the intention of the operator.

According to the second aspect of the present invention, since the bar member for sliding the operating member integrally is provided on the door surface, if the bar member is closed after the door is closed, the bar member is integrated with the bar member. The operation plate slides and the safety switch operates. That is, the contact portion of the safety switch is turned ON only after the operator closes the bar member.

This makes it possible to more reliably prevent the safety switch from being operated independently of the intention of the operator. As a result, it can be ensured that the safety switch always operates at the appropriate time.

In this case, since the bar member is provided separately from the operating plate, the locked state of the door can be reliably maintained by the bar member.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 7 are views for explaining an actuator mechanism for a safety switch according to an embodiment of the present invention. FIG. 1 is a front view of a door portion employing this actuator mechanism, and FIG. FIG. 3 is a schematic plan view illustrating the open / close state of the door, FIG. 3 is an enlarged front view of the actuator mechanism, FIG. 4 is a cross-sectional view taken along line IV-IV of FIG.
3 is a sectional view taken along the line VV in FIG. 3, FIG. 6 is a front view of a door portion when a safety switch is operated, and FIG. 7 is an enlarged view of an actuator mechanism portion in FIG.

In the following description, the left-right direction refers to the left-right direction in FIG. 1 or FIG. 3, and the up-down direction refers to the up-down direction in FIG. 1 or FIG.

As shown in FIG. 1, the actuator mechanism 1
Is provided on the door 10 and mainly includes an operating plate 2 slidable in the left-right direction (see the arrow) and a bar 3 that slides integrally with the operating plate 2.
In the drawing, reference numeral 11 denotes a knob, and the door 10 is a pivotable door that pivots in a direction perpendicular to the paper surface (see FIG. 2). An operated industrial machine (not shown) is installed.

Actuator mechanism 1 on wall 12
A safety switch 20 is disposed at a position facing the safety switch 20. The solenoid unit 3 is located below the safety switch 20.
0 is provided. Above the safety switch 20, a metal fitting 35 for attaching and removing the bar 3 of the actuator mechanism 1 is attached.

As shown in FIGS. 3 to 5, a substantially rectangular base plate 4 is fixed on the door 10. Base plate 4
Has stopper portions 4a, 4a and 4b, 4b bent at substantially right angles at both ends in the left-right direction. Each stopper portion 4b is disposed near both ends in the vertical direction of the base plate 4, and each stopper portion 4a is disposed between them.

A pair of guide plates 5 each having a substantially S-shaped cross section (see FIG. 4) are fixed to both ends of the base plate 4 in the vertical direction by, for example, welding. On the other hand, a rectangular slide plate 6 is arranged on the base plate 4. Both ends of the slide plate 6 in the vertical direction are arranged in each guide plate 5, and the slide plate 6 is supported by the two guide plates 5 so as to be slidable in the left-right direction.

The operating plate 2 and the bar 3 are fixed on the slide plate 6 by mounting screws 15 and 16, respectively. Thus, when the bar 3 is operated, the operation plate 2 slides integrally via the slide plate 6.

The forward and backward ends of the slide plate 6 during the sliding movement are regulated by the respective stopper portions 4a of the base plate 4. The slide plate 6 has a screw hole 17 for mounting the operation plate 2 at a position where the right and left sides are different.
Are formed.

In each guide plate 5, leaf springs 7, 8 extending in the left-right direction are mounted. Each of the leaf springs 7 and 8 is in pressure contact with both ends of the slide plate 6 in the vertical direction.
Thereby, the play of the slide plate 6 is prevented, and an operational feeling when the bar 3 is operated can be obtained. Each stopper 4b of the base plate 4
Thus, the leaf springs 7 and 8 are prevented from coming off.

On the other hand, the safety switch 20 has a slit 21 into which the operation plate 2 is inserted. Safety switch 20
3, a cam wheel 22 rotatably supported about a dashed line C in FIG. 3, a rod 23 extending and retracting by rotation of the cam wheel 22, and a movable contact 24 attached to a tip of the rod 23. A fixed contact 25 is provided opposite to the movable contact 24.

The cam wheel 22 has an engagement recess (not shown) with which the tip of the operation plate 2 inserted inside the safety switch 20 can be engaged. A lock member 26 for locking the cam wheel 22 is provided near the cam wheel 22.
Is provided. Although not shown, the solenoid unit 30 has a solenoid for releasing the locked state by the lock member 26. Note that the lock member 26 and the solenoid unit 30 can be omitted.

Next, the operation and effect of this embodiment will be described. To turn on the safety switch 20 in the open state of the door 10 shown in FIG. 2A, first, the door 10 is closed (see FIG. 2B). At this time, the actuator mechanism 1 is arranged to face the safety switch 20.

Next, the operator slides the bar 3 toward the safety switch 20 side. Then, the operation plate 2 slides together with the bar 3 via the slide plate 6. And the bar 3 engages with the metal fitting 35 on the wall 12,
The tip of the operating plate 2 passes through the slit 21 and the safety switch 2
0 (see FIGS. 2B, 6 and 7).

Inside the safety switch 20, the locked state of the cam wheel 22 is released by the solenoid unit 30, and the tip of the operating plate 2 is engaged with the engaging concave portion (not shown) of the cam wheel 22 so that the cam wheel 22 is engaged. Rotate. Then, the rod 23 connected to the cam wheel 22 advances to the fixed contact 25 side, and the movable contact 24 at the tip of the rod 23 contacts the fixed contact 25 to turn on the contact. 26 are engaged, and the cam wheel 22 is locked. In response to the ON signal, the industrial machine (not shown) becomes operable, and the control device operates the machine via the ON signal.

Next, in order to turn off the safety switch 20 in the closed state of the door 10 shown in FIG. 2B, the engagement between the lock member 26 and the cam wheel 22 is released by driving the solenoid unit 30 first. Come cam wheel 2
Release the locked state of 2. From this state, the operator slides and moves the bar 3 in the direction in which the bar 3 is pulled out of the fitting 35. Then, the operating plate 2 together with the bar 3 via the slide plate 6
Slides, and the operation plate 2 moves outside the safety switch 20 (see FIGS. 1 and 3).

In the safety switch 20, when the cam wheel 22 returns to the original position, the rod 23 retreats, and the movable contact 24 at the tip of the rod 23 becomes the fixed contact 25.
Away from the contact, the contact is turned off. Then this O
Upon receiving the FF signal, the industrial machine stops operating. Thereafter, the operator opens the door 10 to enter the inside, and performs maintenance and inspection of the machine.

In this case, with respect to the pivotable door 10,
Since the operation plate 2 is provided so as to slide in a direction different from the rotation direction of the door 10, the safety switch 20 does not operate in conjunction with the movement of the door 10.

That is, even if the door 10 is accidentally closed during maintenance or inspection of the machine by an operator, the safety switch 20 is not turned on by itself, and the operator moves the operating plate 2 to the safety switch 20 side. The safety switch 20 is turned ON only after sliding.

Further, even if a third party erroneously tries to open the door 10 when the safety switch 20 is ON, the safety switch does not turn OFF in conjunction with the movement of the door 10.
The safety switch 20 is turned off only after the operator slides the operation plate 2 away from the safety switch 20.

As described above, the safety switch 20 does not operate only by the opening / closing operation of the door 10, and the safety switch 20 is operated only after the operator slides the operation plate 2. Thereby, it is possible to prevent the safety switch 20 from being operated irrespective of the worker's intention, and the safety switch 2
0 can always be activated at the appropriate time.

Further, in the present embodiment, since the bar 3 is provided which slides integrally with the operation plate 2, the bar 3 is closed when the safety switch 20 is ON.
When the safety switch 20 is in the OFF state, the bar 3 is open.

That is, since the safety switch 20 is operated only after the operator operates the bar 3, the safety switch 20 can be more reliably prevented from operating regardless of the intention of the operator.

In this case, since the bar 3 is provided separately from the operating plate 2, the locked state of the door 10 can be reliably maintained by the bar 3.

In order to surely maintain the locked state of the door 10 by a member separate from the operation plate 2, it is preferable not to omit the bar 3, but it is also possible to omit the bar 3. In this case, since the operating plate 2 plays the role of the bar 3 and the slit 21 of the safety switch 20 plays the role of the metal fitting 35, both need to have some strength.

In addition, since the pivoting door is generally easily opened and closed with a relatively small force, there is a high possibility that the pivoting door will be accidentally closed. Therefore, the embodiment in which the present invention is applied to the pivoting door 10 is described. Although the embodiment is an optimal embodiment of the present invention, the application of the present invention is not limited to this, and the present invention can be similarly applied to a sliding door.

FIG. 8 shows an example in which the present invention is applied to a sliding door. In the figure, a door 10 'is indicated by an arrow a.
It is slidably provided in the direction. An actuator mechanism 1 'according to another embodiment of the present invention is provided on the door 10'. The actuator mechanism 1 'has an operation plate 2' rotatably supported in the direction of arrow b. On the other hand, a safety switch 20 'is arranged on the side of the wall 12', and a slit 21 'is formed in the safety switch 20' in a direction perpendicular to a surface to be mounted on the wall.

In this case, after the door 10 'is slid in the direction of arrow a to close it, the operating plate 2' is rotated in the direction of arrow b so that the tip of the operating plate 2 'is
The safety switch 20 'is turned ON by inserting it into the slit 21' of 0 '. Conversely, by moving the tip of the operating plate 2 'to the outside of the slit 21',
The safety switch 20 'is turned off.

That is, also in this case, similarly to the above embodiment, since the operating plate 2 'is provided so as to move in a direction different from the opening and closing direction of the door 10', the door 10 'is provided.
The safety switch 20 'does not operate in conjunction with the movement of the operator, and the safety switch 20' can be prevented from operating regardless of the intention of the operator.

[0045]

As described above, in the actuator mechanism for a safety switch according to the first aspect of the present invention, the operation plate for connecting / disconnecting (ON / OFF) the contact portion of the safety switch on the wall side is in a direction different from the opening / closing direction of the door. , It is possible to prevent the operation plate from moving in conjunction with the movement of the door, thereby preventing the safety switch from being operated independently of the intention of the operator.

Further, in the actuator mechanism for a safety switch according to the second aspect of the present invention, since the pivotable door is provided with a bar member for integrally sliding the operation plate, the safety switch is operated only by operating the bar member. Can be actuated, whereby the safety switch can be more reliably prevented from being actuated irrespective of the operator's intention. In addition, the lock state of the door can be reliably maintained by the bar member provided separately from the operating member.

[Brief description of the drawings]

FIG. 1 is a front view of a door portion employing an actuator mechanism for a safety switch according to an embodiment of the present invention.

FIGS. 2A and 2B are schematic plan views illustrating the open / closed state of the door of FIG. 1, in which FIG. 2A illustrates an open state of the door, and FIG. 2B illustrates a closed state of the door.

FIG. 3 is an enlarged front view of the actuator mechanism shown in FIG. 1;

FIG. 4 is a sectional view taken along the line IV-IV of FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a front view of the door when the safety switch is activated.

FIG. 7 is an enlarged view of an actuator mechanism of FIG. 6;

FIG. 8 is a schematic plan view illustrating an open / closed state of a door employing an actuator mechanism for a safety switch according to another embodiment of the present invention.

FIG. 9 is a schematic plan view for explaining a conventional actuator mechanism.

[Explanation of symbols]

 1, 1 'Safety switch actuator mechanism 2, 2' Operating plate 3 Bar 10, 10 'Door 12, 12' Wall 20, 20 'Safety switch 21, 21' Slit 24 Movable contact 25 Fixed contact

Claims (2)

[Claims] 1. An actuator mechanism for operating a safety switch disposed on an opening / closing portion of a door, wherein the actuator mechanism moves on a door surface in a direction different from the opening / closing direction of the door, thereby enabling a safety switch on a wall side to move. An actuator mechanism for a safety switch, comprising an operation plate for connecting and disconnecting a contact portion. 2. The door according to claim 1, wherein the door is a pivotable door, the operation plate is slidably supported on a door surface, and the operation plate is integrally mounted on the door surface when the door is moved. The actuator mechanism for a safety switch according to claim 1, further comprising a bar member for sliding movement.