JPS61221976A - Sensor attachment mechanism - Google Patents

Abstract

PURPOSE:To dedide the position of an optical sensor simply and with high accuracy by inserting a sensor holder through an opening of a set plate to hook the front coupling projection part into a groove and pressing the rear coupling projection part with a pressure plate. CONSTITUTION:A pressure plate 32 is moved toward an arrow head B against the force of a spring 33, and a sensor holder 30 is inserted through an opening part 31c of a sensor plate 31. Thus a front coupling projection part 30b interlocks a groove 31d and held by a holding part 31b. Here the movement of the plate 32 is released and a rear coupling projected part 30b of the holder 30 is pressed by the tip of the plate 32. Then the holder 30 is positioned at the part 31b. In this case, a print plate 27a can be fixed regardless of the attachment accuracy of a sensor 23 since the plate 27a and the holder 30 can slide freely. Thus the sensor 23 can be attached with high accuracy.

Description

[Detailed Description of the Invention] [Summary] Sensor mounting is a mechanism in which an engaging protrusion on one side of the outer circumference of a sensor holder holding an optical sensor is engaged with a set plate groove, and the engaging protrusion on the other side is engaged with a set plate groove. The attachment of the optical sensor can be facilitated by pressing the mating protrusion with the pressure plate.

[Industrial application field]

The present invention is a point of sale management system.
The attachment of an optical sensor for a scanner that reads barcodes used in applications such as ES (hereinafter referred to as PO8) is related to the mechanism, and in particular, the attachment of the optical sensor that can facilitate the work is related to the mechanism.

Recently, it has become widely available in department stores, supermarkets, etc.
s system has been adopted, and a reading device (hereinafter referred to as a scanner) that optically reads the item number and price of a product from a label or the like is used. A configuration is desired in which the optical sensor incorporated in the optical unit of this scanner can be easily attached.

[Conventional technology]

Hereinafter, a scanner used in a POS system will be explained with reference to FIGS. 3 to 5 as an example. FIG. 3 is an internal side view showing an outline of the scanner, FIG. 4 is a plan view showing the main parts of FIG. 3, and FIG. 5 is a side sectional view illustrating a conventional method.

The same reference numerals indicate the same objects throughout the figures.

As shown in FIG. 3, the scanner 1 has an optical unit 2. The optical unit 2 includes a laser tube (not shown) and a hologram disk 21 directly connected to a motor h. It is composed of mirrors 4a to 4d, a lens 22, a sensor (light receiving element of an optical sensor) 23, etc., and the light irradiated from the laser tube to the rotating hologram disk 21 via the mirror 4a is directed to the mirror 4b.

It has a function of scanning a bar code of an object outside the apparatus with a laser beam from the reading window 5 through the reading window 4c, and reading the reflected light shown by the broken line in the figure.

That is, as shown in FIG. 4, the reflected light is reflected in a right angle direction by a mirror 4d, is focused by a lens 22, and is sent to a sensor 2.
Detected at 3. The detection signal is converted into an electrical signal and sent to the third
The information is sent to the recognition unit 3 shown in the figure. Further, the recognition unit 3 has a function of decoding input electrical signals and recognizing them as data.

Here, to explain the mechanism in detail, the sensor 23 is attached to the frame 2 of the optical unit 2, as shown in FIG.
4, a sensor guide 25 having a guide hole 25a is positioned and fixed with a screw 26.

The sensor 23 is attached to a printed board 27, and a conversion circuit 28 for converting the detection signal of the sensor 23 into an electrical signal is mounted on the printed board 27, and the sensor 23. A shield case 29 is attached to surround the conversion circuit 28.

The sensor 23 is inserted into the guide hole 25a of the sensor guide 25 to be guided, and is screwed to the frame 24 at a mounting portion provided in a position perpendicular to the drawing of the shield case 29.

[Problem that the invention seeks to solve]

In the above conventional mechanism, the sensor 23 fixed to the printed board 27 is attached to the guide hole 25 of the sensor guide 25.
The problem is that positional accuracy is not only not achieved due to the play in the fit between the guide hole 25a and the sensor 23 and the state of screw tightening, but also that the installation process is troublesome. There is.

[Means for solving problems]

In FIGS. 1 and 2, the sensor holder 30 holds the sensor 23 at one end of the guide hole 30a, and has engaging protrusions 30b formed on at least two opposing surfaces of the outer periphery of the other end.

The set plate 31 has a holding part 31b that holds the sensor holder 30 inserted through the opening 31c, and a groove 3 in which the engagement protrusion 30b on the front surface of the held sensor holder 30 engages.
1d.

The pressure plate 32 has a function of urging the engagement protrusion 30b on the rear surface of the sensor holder 30 held by the holding part 31b of the center plate 31.

Therefore, the sensor holder 30 is inserted into the holding part 31b of the center plate 31, and the engagement protrusion 30b on the front surface is inserted into the groove 31d.
The engagement protrusion 30b on the rear surface of the sensor holder 30 is pressed by the pressure plate 32.

[Effect]

According to the present invention, the sensor holder 30 is inserted through the opening 31C of the center plate 31, and the front engaging protrusion 30b
By engaging the rear engagement protrusion 30b with the pressure plate 32, the optical sensor 23 is engaged with the groove.
positioning can be performed accurately and easily.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a side view showing an embodiment of the present invention, and FIG. 2 is a front view showing the main parts of FIG. 1. The same reference numerals refer to the same objects throughout the design.

As shown in FIGS. 1 and 2, the sensor holder 30 has a guide hole 30a through which reflected light passes and holds the sensor 23, and an engaging protrusion 30b at one end of the outer periphery.

A flange 30c is formed at the other end.

The printed board 27a is provided with a hole 27b that is larger than the diameter of the guide hole 30a and smaller than the diameter of the flange 30c, and the printed board 27a is connected to the flange 30c with the pin 30.
The sensor holder 30 is slidably attached to the surface of the printed board 27a within the distance between the hole 27b and the connecting pin 30d, sandwiching it between the temporary 31 connected at d.

Therefore, the sensor 23 and the conversion circuit 28 are connected by a flexible conductive wire (not shown).

The sensor plate 31 has a hole 31a through which reflected light passes.

and a holding portion 31b are formed. The holding portion 31b is provided with an opening 31c into which the sensor holder 30 is inserted, and a groove 31d into which the front engagement protrusion 30b of the inserted sensor holder 30 engages. Also sensor plate 3
1 is fixed to the frame 24 with a precision suitable for mounting the sensor 23.

One end of the pressure plate 32 is rotatably attached to the frame 24, and the other end is biased toward the opening 31c by a spring 33, and the engagement protrusion 30b at the rear of the inserted sensor holder 30 is configured to press in the direction of arrow A.

Since such a configuration exists, the pressure plate 32
When the sensor holder 30 is retracted in the direction of arrow B against the elasticity of the spring 33 and the sensor holder 30 is inserted through the opening 31c of the sensor plate 31, the front engagement protrusion 30b fits into the groove 31d.
is engaged with and held by the holding portion 31b.

Then, when the pressure plate 32 is released from the retracted state, the tip of the pressure plate 32 presses the engagement protrusion 30b at the rear of the sensor holder 30, and the sensor holder 30 is positioned on the holding part 31b of the sensor plate 31. At this time, since the printed board 27a and the sensor holder 30 are slidable, the sensor 23 can be fixed on the printed board 27a regardless of the accuracy with which the sensor 23 is attached.

In this way, the sensor 23 can be easily attached with high precision.

[Effect of the invention]

As explained above, according to the present invention, there is an effect that the sensor can be attached with high precision and with a simple operation.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a front view showing the main parts of Fig. 1, Fig. 3 is an internal side view showing an overview of the scanner, and Fig. 4 is the same as Fig. 3. FIG. 5 is a plan view showing the main parts, and a side sectional view illustrating the conventional method. In the figure, 1 is a scanner, 2 is an optical unit, and 23 is a unit.
is a sensor, 24 is a frame, 25 is a sensor guide, 25
a, 30a'' is a guide hole, 27. g7a is a printed board,
27h. 31a is a hole, 28 is a conversion circuit, 29 is a shield case,
30 is a sensor holder, 30b is an engaging protrusion, 30c is a flange, 91 is a sensor plate, 31b is a holding portion, 31
C is an opening, 31d is a groove, 32 is a pressure plate,
□ Check the front of each part of the ticket 1 and leather I. Q7

Claims (1)

[Claims] A sensor (23) is held at one end of the guide hole (30a),
Engagement protrusions (3
1b) and the opening (3
1c) and a holding part (31b) that holds the sensor holder (30) inserted from the sensor holder (30) and the held sensor holder (30).
) engages with the engagement protrusion (30b) on the front surface of the groove (31d).
) and a pressure plate (32) that urges the engagement protrusion (30b) on the rear surface of the held sensor holder (30). Pressure plate (32) by inserting it into the holding part (31b) of (31) and engaging the engagement protrusion (30b) on the front surface with the groove (31d).
The engagement protrusion (30) on the rear surface of the sensor holder (30)
b) A sensor mounting mechanism characterized by having a configuration for pressing.