JPH0453591Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a reciprocating automatic door or cover installed in an injection molding machine that detects obstacles that prevent the closing operation of the reciprocating automatic door or cover when the automatic door or cover is operated. The present invention relates to an obstacle detection device for an opening/closing body.

(Prior Art) There is a device that uses a photoelectric sensor as an obstacle detection device during the closing operation of a reciprocating automatic opening/closing body. In conventional detection devices, a plurality of sets of photoelectric sensors are usually used, and one example of such a device is Japanese Patent Application Laid-Open No. 60-95089.

That is, either one of the photoelectric emitter or the photoelectric receiver of a photoelectric sensor consisting of a photoelectric emitter and a photoelectric receiver is installed on the side of a reciprocating automatic opening/closing body, and the other is placed opposite the reciprocating automatic opening/closing body. Install it on the end side of the moving opening/closing passage space, or use a photoelectric sensor and a light reflector, and either one of them is installed on the side of the reciprocating automatic opening/closing body and facing it,
The other one was installed at the end of the opening/closing passage space. Furthermore, one of the earlier applications using a set of photoelectric sensors is Utility Model Application No. 168087/1987. In this case, a light beam is caused to travel to a position where a reciprocating automatic door finishes closing, so that the presence or absence of an obstacle can be detected when the automatic door finishes closing.

In this way, the light beam can be emitted and received across the opening/closing passage space of the reciprocating automatic opening/closing body, and if there is an obstacle in between,
The light beam projected onto the obstacle is blocked and the paired photoelectric receiver is unable to receive light, and this photoelectric receiver emits an electrical signal, which activates the drive source of the reciprocating automatic opening/closing body. It was stopped and the closing operation was canceled.

(Problem to be solved by the invention) In order to reliably detect obstacles of various sizes and at different heights, in conventional devices, the opening and closing passage space of the reciprocating automatic opening/closing body must be illuminated with multiple light beams. Therefore, it was necessary to provide a large number of photoelectric sensors.

Furthermore, in the latter case, it was impossible to detect obstacles in the middle of the opening/closing passage space.

(Means for Solving the Problems) The present invention provides an electrically simplified obstacle detection device for a reciprocating automatic opening/closing body using one photoelectric sensor, and its configuration is as follows. , as follows.

In the safety door of an injection molding machine, a reciprocating automatic opening/closing body that automatically opens and closes the opening of the frame body by reciprocating motion is installed on the front side of the vertical member that becomes the tip side when the reciprocating automatic opening/closing body is closed.
The antenna member main body extending over almost the entire length in the vertical direction of the opening is provided so as to be tiltable with respect to the vertical member with an elastic body interposed therebetween, and a reciprocating automatic opening/closing body is attached to the upper end of the antenna member main body for opening/closing movement. A light reflector is fixed facing the direction, and a photoelectric sensor facing the light reflector is fixed to the frame side, and one end is attached to the antenna member main body, and the back side of the vertical member is inserted loosely through the through hole of the vertical member. This is an obstacle detection device for a reciprocating automatic opening/closing body that applies a predetermined initial compression amount to the elastic body by a plurality of holding members that are engaged with the elastic body.

(Function) Therefore, when the reciprocating automatic opening/closing body closes the opening of the frame, there is no obstacle in the main body of the antenna member which is tiltable with respect to the vertical member on the tip side when the reciprocating automatic opening/closing body closes. When they come into contact with each other, the antenna member main body compresses the elastic body and tilts, and the light reflector fixed to the upper end of the antenna member main body tilts. Therefore, when the light reflector is fixed to the antenna member main body, the light emitted from the photoelectric sensor and reflected by the light reflector will not enter the photoelectric sensor. In this way, it is possible to detect an obstacle that obstructs the opening of the frame. Then, when the obstacle is removed, the antenna member main body returns to its original position due to the repulsive force of the elastic body that has been given a predetermined initial compression amount until the holding member is locked to the back surface of the vertical member.

(Example) An example of the obstacle detection device for a reciprocating automatic opening/closing body of the present invention will be described based on the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a frame of a safety door portion of an injection molding machine having an opening 1a. 2 is the opening 1 of the frame
This is a reciprocating automatic opening/closing body (hereinafter simply referred to as an opening/closing body) which is a door or a cover that automatically opens and closes a by reciprocating motion. 3 is an antenna member, and a vertical member 2a, which will be described later, is on the tip side when the opening/closing body 2 is closed.
It is located on the side. 4 is a photoelectric sensor having a photoelectric emitter and a photoelectric receiver, and the opening 1a of the frame body
It is provided on the starting point side 1b (FIG. 2) or the ending point side 1c (FIG. 1) of the peripheral edge in the opening/closing direction. 5 is a mirror plate,
It is a light reflector such as a prism, and is fixed to the upper end of the antenna member 3 so as to face the photoelectric sensor 4, and faces the opening/closing movement direction of the opening/closing body 2.

Next, the first embodiment will be explained in detail based on FIGS. 3A and 3B. The first embodiment is an obstacle detection device based on the inclination of the vertical axis of the light reflector 5.

A relatively vertical through hole 2 is provided in the vertical member 2a of the opening/closing body 2.
A′ is provided. Reference numeral 6 denotes an antenna member main body consisting of a channel-shaped column, which has a pocket capable of accommodating the vertical member 2a, and extends almost the entire length in the vertical direction of the opening 1a, that is, almost the entire length in the front surface of the vertical member 2a. are doing. Reference numeral 7 designates a holding rod, the tip of which is fixed to the inner surface of the main body 6, the tail end of which is loosely inserted into the through hole 2a' of the vertical member, and the nut 7b is inserted through the washer 7a.
is screwed on. In this way, the holding rod 7 and the nut 7b constitute a holding member whose one end is attached to the antenna member main body 6, and which is loosely inserted into the through hole 2a' of the vertical member and locked to the back surface of the vertical member 2a. There is. A compression coil spring 8 is interposed between the outer surface of the vertical member 2a and the inner surface of the antenna member body 6, surrounding the holding rod 7. In this way, the antenna member 3 is elastically supported by the vertical member 2a of the opening/closing body at several locations in the vertical direction. The compression coil spring 8 has a nut 7b that locks onto the back surface of the vertical member 2a.
A predetermined amount of initial compression is given by changing the amount of screw engagement.

FIG. 3B shows another structural example of the first embodiment. The same reference numerals as in FIG. 3A indicate the same parts, and the explanation will be omitted.

2' is a support member of the antenna member 3, the base is fixed to the outer surface of the vertical member 2a side of the opening/closing body, the vertical member 2'a is formed at the tip of the L-shaped member, and the vertical member 2'a is attached to the vertical member 2'a. is provided with a plurality of through holes 2'a' scattered in the vertical direction,
A holding rod 7 is loosely inserted into each of the through holes 2'a'.

The operation will be explained with reference to FIG.

When the antenna member 3 comes into contact with the obstacle A, the antenna member main body 6 compresses the compression coil spring 8 and tilts. As a result, the light that would normally be emitted from the photoelectric sensor 4 , reflected by the light reflector 5 , and received by the photoelectric sensor 4 is changed from the vertical axis of the light reflector 5 due to the tilting of the light reflector 5 . , and the photoelectric sensor 4 no longer receives the light. Due to this phenomenon,
An electric signal is emitted from the photoelectric sensor 4 to stop the drive source (not shown) of the opening/closing body 2.

A second embodiment will be described based on FIG. The second embodiment shows an obstacle detection device based on the inclination of the horizontal axis of the light reflector 5. As shown in FIG. 6, the photoelectric sensor 4 is provided inside the frame 1. The same symbols as in FIG. 3 indicate the same parts.

Reference numeral 6' denotes an antenna member main body that extends along almost the entire vertical length of the vertical member 2a of the opening/closing body, and has a plurality of cylindrical parts 6'a formed at the inner end, and extends along the vertical member 2a of the opening/closing body. It is rotatably supported by a pin 9 fixed to the inner end of the member 2a. And holding rod 7
has one end fixed to the inner surface of the antenna member main body 6',
Its tail end is loosely inserted into the through hole 2a'' of the vertical member of the opening/closing body and screwed with a nut 7b to be locked to the vertical member 2a. The vertical member 2a is biased forward by a compression coil spring 8 whose amount is adjusted to give a predetermined initial compression amount.5a is a mounting plate for the light reflector 5, one end of which is attached to the antenna member. Fixed to the upper end of the main body 6',
It faces the photoelectric sensor 4.

The operation will be explained based on FIG.

When the antenna member 3' comes into contact with the obstacle A, the antenna member main body 6' compresses the compression coil spring 8,
Rotates around pin 9. As a result, the light reflector 5
The reflected light from is deflected in the lateral direction of the light reflector 5,
The photoelectric sensor 4 cannot receive light. Due to this phenomenon, an electric signal is generated from the photoelectric sensor 4 to stop the drive source (not shown) of the opening/closing body 2.

In both the first and second embodiments, when the obstacle A is removed, the antenna members 3, 3 return to their original state due to the elastic force of the compression coil spring 8 which has been given a predetermined initial compression amount, and the nut 7b is released. It locks onto the inner surface of the vertical members 2a, 2'a.

(Effects of the invention) As can be understood from the above explanation, according to the obstacle detection device for the reciprocating automatic opening/closing body of the present invention, which is provided in the safety door of an injection molding machine, multiple The member and the elastic body are compactly housed between the vertical member and the antenna member main body, resulting in a simple external shape, and the light reflector is fixed to the upper end of the antenna member main body, so that human bodies, objects, etc. passing through the opening can be protected. This effectively prevents malfunctions caused by Furthermore, since the antenna member main body extends over almost the entire length of the opening in the vertical direction, it is possible to reliably detect obstacles such as a human body or an article that are present in a part of the opening. Furthermore, obstacles came to be detected using a pair of photoelectric sensors and a light reflector.In particular, as the number of photoelectric sensors fixed to the frame decreased, wiring, control equipment, etc. were simplified, and electrical The frequency of failures has been reduced and maintenance inspections have been simplified.

In addition, a predetermined amount of initial compression can be uniformly applied to the elastic body by the plurality of holding members, so
The antenna member main body to which the light reflector is fixed securely assumes a predetermined position when not in operation. As a result, the reliability and durability of the obstacle detection device of the reciprocating automatic opening/closing body are improved, and the antenna body is prevented from tilting and malfunctioning due to vibration or other weak external forces. It can be prevented.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic diagrams of an embodiment of an obstacle detection device for a reciprocating automatic opening/closing body according to the present invention, and Figure 3A is a view of the opening/closing body side of the first embodiment of the present invention. 3
Figure B is a diagram of another structural example of the first embodiment, Figure 4 is a view of the opening/closing body side of the second embodiment of the present invention, Figure 5 is an explanatory diagram of the operation of the first embodiment, and Figure 6 is a diagram illustrating the operation of the first embodiment. The figure is an explanatory diagram of the operation of the second embodiment. 1... Frame body, 1a... Opening, 2... Reciprocating automatic opening/closing body, 2a, 2'a... Vertical member, 2a', 2'
a', 2a''...through hole, 3,3'...antenna member, 4...
... Photoelectric sensor, 5 ... Light reflector, 6, 6' ... Antenna member main body, 7 ... Support rod, 8 ... Compression coil spring (elastic body).

Claims (1)

[Scope of utility model registration request] In the safety door of an injection molding machine, a reciprocating automatic opening/closing body that automatically opens and closes the opening of the frame body by reciprocating motion is installed on the front side of the vertical member that becomes the tip side when the reciprocating automatic opening/closing body is closed.
The antenna member main body extending over almost the entire length in the vertical direction of the opening is provided so as to be tiltable with respect to the vertical member with an elastic body interposed therebetween, and a reciprocating automatic opening/closing body is attached to the upper end of the antenna member main body for opening/closing movement. A light reflector is fixed facing the direction, a photoelectric sensor facing the light reflector is fixed to the frame side, and one end is attached to the antenna member main body, and the back side of the vertical member is inserted loosely through the through hole of the vertical member. An obstacle detection device for a reciprocating automatic opening/closing body, characterized in that a predetermined initial compression amount is applied to the elastic body by a plurality of holding members that are engaged with the elastic body.