JPH0650048Y2 - Laser beam interlock mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a laser beam interlock mechanism for protecting a human body or the like from a laser beam by blocking (blocking) a laser beam emitted from a laser block section. It is a thing.

[Outline of the Invention] The present invention is a bar code reading device (hereinafter referred to as a bar coder) configured to read a bar code by using a laser beam, by removing a side plate such as a top plate from the cabinet of the bar coder. When the side plate is removed from the cabinet when inspecting or repairing the inside of the cabinet, the shutter plate placed in front of the laser block part inside the cabinet is automatically in the state, blocking (blocking) the laser beam, It enables repairs and inspections in a safe condition.

[Prior Art] As shown in FIG. 4, a laser block part (not shown) is installed in a cabinet 101, and a laser beam emitted from the laser block part is passed through a window 102 provided on one side surface of the cabinet 101 to pass through a VTR cassette. Irradiated object 103
Hit the bar code (not shown) displayed on one side of
A bar coder which receives the reflected light by a light receiving element and photoelectrically converts it to read the recorded contents of the bar code is widely used in cassette auto changers and registers of television broadcasting stations.

And in the conventional bar coder of this type, in order to maintain, inspect or repair the inside of the cabinet,
When the side plate 104 such as the top plate attached to the cabinet is attached from the cabinet 101, the switch mechanism provided in the cabinet 101 automatically operates to turn off the + B power supply to the APC circuit and the laser diode to reflect the laser beam. Is automatically stopped. This is to prevent the laser beam from being irradiated on the human body during repair and inspection.

[Problems to be solved by the invention] By the way, in the conventional bar coder of this type, as described above, in order to prevent the laser beam from irradiating the human body at the time of repair or inspection, the APC circuit or the laser diode Since a switch mechanism for controlling on / off of the + B power supply is attached to a cabinet or the like and a side plate such as a top plate is removed from the cabinet, the switch mechanism is automatically turned off to turn off the laser beam. There was a problem.

(1) The circuit configuration such as the APC circuit is complicated because the switch mechanism is incorporated.

(2) The noise of the switch mechanism adversely affects the control of the APC circuit and the like, and causes so-called runaway.

The present invention can solve the above-mentioned conventional problems by using a mechanical mechanism to block the laser beam without using the conventional electric switch mechanism.

[Means for Solving the Problems] A shutter plate, which is arranged in front of a laser block portion provided in a cabinet and shields a laser beam emitted from the laser block portion, is rotatably attached to a shutter plate supporting member. When a side plate that opens and closes the opening of the cabinet is attached to the cabinet, the side plate presses the pressed portion of the shutter plate, the shutter plate rotates in one direction, and the shield of the laser beam is released. When it was removed from the cabinet, the shutter plate rotated in the other direction to block the laser beam.

[Operation] When the side plate such as the top plate is removed to repair or inspect the inside of the cabinet, the shutter plate whose pressure on the pressed portion is released by the side plate is rotated in one direction to cover the front of the laser block. To block the laser beam.

Also, when repairs, inspections, etc. are completed and a side plate such as a top plate is attached to the cabinet, the pressed part of the shutter plate is pressed by the side plate, the shutter plate rotates in one direction, and the laser block part is rotated. Open the front of the.

[Embodiment] Next, an interlock mechanism of the present invention will be described with reference to FIGS. Reference numeral 1 denotes a bar coder provided with an interlock mechanism according to the present invention. The bar coder 1 has a laser block part (not shown) provided in a cabinet 2, and a laser beam emitted from the laser block part is stored in the cabinet 2. VTR through the window 4 on the side 3
A bar code (not shown) displayed on one side of the irradiated body 5 such as a cassette is applied, the reflected light is received by a light receiving element and photoelectrically converted, the recorded content of the bar code is read, and the information is read by the CPU. And so on.

11 is an interlock mechanism of the present invention, the interlock mechanism 11 is arranged in front of the laser block portion (between the laser block portion and the window 4 and close to the laser block portion), Shutter plate 12 that blocks the laser beam emitted from the laser block section
And a shutter plate support member 13 that rotatably supports the shutter plate 12 so that the shutter plate 12 can be displaced from the laser beam blocking state to the non-blocking state. The shutter plate support member 13 is made of a metal plate in the shape of a rectangular parallelepiped box whose bottom surface is open, and is mounted on the bottom surface of the cabinet 2 so as to cover the laser block portion.
The front surface 14 (the surface located between the laser block portion and the window 4 of the cabinet 2) is provided with a cutout portion 15 for guiding the laser beam emitted from the laser block portion to the outside and introducing reflected light. At the same time, the shutter plate 12 is provided at the upper end of the left and right side surfaces 16, 16 on the front surface 14 side.
A pair of left and right bearing pieces 17, 17 for rotatably pivoting is provided.

Further, the shutter plate 12 is formed of a rectangular metal plate with a size capable of covering (closing) the notch 15 provided on the front surface 14 of the shutter plate supporting member 13, and both sides on the upper end side thereof. The portion is provided with a pair of left and right bearing pieces 18, 18 overlapping with a pair of bearing pieces 17, 17 provided on both left and right side surfaces of the shutter plate support member 13. The left and right bearing pieces 17, 18 are pivotally supported by a shaft 19 in a state of being superposed on each other, so that the shutter plate 12 is rotatably attached to the shutter plate support member 13 and is in a normal state (shutter plate The shutter plate 12 hangs down under its own weight (becomes in a vertical normal state) under the condition that no special force is applied to the shutter 12, overlaps the front surface 14 of the shutter plate support member 13, and closes the notch 15 provided in the front surface 14. It is like this.

The shutter plate 12 has a predetermined inclination angle θ (for example, 120 °) with respect to the left and right side portions on the upper end side with respect to the shutter plate 12.
A pair of left and right pressed portions 20 and 21 are provided in a state of having a front and rear), and these pressed portions 20 and 21 project from the upper opening of the cabinet 2 to the outside.

Then, if a side plate 22 as a top plate is attached to the cabinet 2 so as to close the upper opening of the cabinet 2, the pressing portions 20 and 21 are pressed by the inner surface of the side plate 22, and the shutter plate 12 is the shaft. It rotates about 90 around 90 degrees and becomes horizontal, so that the notch 15 provided on the front surface 14 of the shutter plate support member 13 is opened.

Reference numerals 23 and 23 denote a pair of left and right side plates provided on both left and right side members of the shutter plate 12.
When they hang under their own weight, these left and right side plates
The left and right side surfaces of the shutter plate support member 13 are sandwiched between 23 and 23.

In addition, 24 is a lead wire lead-out groove formed in the lower end side of the front surface 14 of the shutter plate supporting member 13, and 25 is a lead wire leading groove when the bar code of the irradiated pair 5 is positioned in front of the window 5 of the cabinet 2. It is an optical sensor for detecting.

Since the interlock mechanism 11 of the embodiment has the above-mentioned configuration, if the side plate (top plate) 22 is removed to repair and inspect the inside of the cabinet 2, the pressed parts 20, 21 by the side plate 22 are removed.
The shutter plate 12 whose pressure has been released hangs down by itself (rotates vertically) and overlaps the front surface 14 of the shutter plate supporting member 13 to close the notch 15 provided in the front surface 14, so that the laser beam is used as a shutter. Since the plate 11 and the box-shaped shutter plate 13 are almost completely enclosed, the repair and inspection can be safely performed.

If the side plate (top plate) 22 is attached to the cabinet 2 after completion of repairs, inspections, etc., the portion to be pressed on the inner surface of the side plate (top plate) 22
When 20, 21 are pushed, the shutter plate 11 is rotated and maintained in a horizontal state, and the cutout portion 15 is kept open.

In the embodiment shown in the drawings, when the top plate (side plate) 22 is removed, the shutter plate 12 is rotated by its own weight to surely close the cutout portion 15, but a spring is used to open the cutout portion 15. You may make it block more reliably.

Also, the shutter plate 12 is not limited to the rotating operation of the top plate,
The shutter plate 12 may be rotated by the left and right side plates.

Further, the shutter plate support member 13 is not limited to the box-shaped member, and any member may be used as long as it can rotatably support the shutter plate 12.

[Effect of the Invention] As described above, the present invention repairs the inside of the cabinet,
When the side plate is removed from the cabinet for inspection, the shutter plate is automatically rotated by the mechanical mechanism to close the front of the laser block with the shutter plate. .

(1) Operates when the side plate is removed from the cabinet
It is not necessary to incorporate a switch mechanism for turning off the + B power supply of the APC circuit or the laser diode into the APC circuit or the like, and the circuit configuration can be simplified.

(2) Since the switch mechanism is unnecessary, it is possible to prevent adverse effects of the switch mechanism, such as runaway or malfunction due to noise.

[Brief description of drawings]

FIG. 1 is a perspective view of the cabinet with the side plate (top plate) removed, and FIG. 2 is a side view of the cabinet with the side plate removed.
The figure is a side view with the side plate attached, and FIG. 4 is a perspective view of a conventional example. DESCRIPTION OF SYMBOLS 1 ... Bar coder, 2 ... Cabinet, 11 ... Interlock mechanism, 12 ... Shutter plate, 13 ... Shutter plate support member.

Claims (1)

[Scope of utility model registration request] 1. A shutter plate, which is disposed in front of a laser block portion provided in a cabinet and shields a laser beam emitted from the laser block portion, is rotatably attached to a shutter plate supporting member, and the cabinet is provided. When the side plate that opens and closes the opening of is attached to the cabinet, the pressed part of the shutter plate is pressed by the side plate, the shutter plate rotates in one direction, the shield of the laser beam is released, and the side plate is removed from the cabinet. And the shutter plate rotates in the other direction to block the laser beam, which is an interlock mechanism for the laser beam.