JPS5918522Y2 - Drive mechanism of optical reader - Google Patents

Description

[Detailed description of the invention] The present invention is, for example, an optical character reading device, in which a reading device in which an illumination section, a lens section, and a light receiving element section are integrally formed is placed on the conveyance path of a form that is conveyed in a horizontal state. , relates to a drive mechanism for a reading device that moves the reading device in the row direction to read data.

In recent years, a wide variety of documents (hereinafter referred to as forms) have been increasing in volume.
An optical character reading device has been developed and put into practical use as a means of processing efficiently and automatically.

Therefore, this type of device requires a reading device that irradiates a large amount of light onto characters or symbols written on a form and receives the light with a light receiving element via a lens or the like.

Moreover, the reading device must be able to move at a constant speed in the row direction and at a constant pitch in the digit direction.

Therefore, conventional reading devices use the so-called flying spot scanner method, in which the document is stopped at a predetermined position and the entire surface of the document is irradiated, and the beam is scanned to read characters, symbols, etc., or the reading device uses a so-called flying spot scanner method, in which the document is stopped at a predetermined position, and the entire surface of the document is irradiated, and the beam is scanned to read characters, symbols, etc., or light-receiving devices are arranged throughout the row. One possible method is to read the document by moving it in the direction of the digits on the document and stopping the entire reading system.

However, all of these devices have drawbacks such as the overall size of the device, the number of adjustment elements, and the difficulty in manufacturing the light-receiving element itself, which increases the cost.

The present invention was developed in view of the above circumstances, and its purpose is to be able to move in the row direction at a constant speed by being located above the form that is being conveyed horizontally, and to be able to change direction at any position. The present invention aims to provide a drive mechanism for an optical reading device that is possible and that can reduce costs by making the device a smaller unit.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

In the figure, reference numeral 1 denotes a reading unit that moves in the row direction on the form p. This reading unit 1 is located in front of a T-shaped cross-sectional holder 2, and illumination lamps 3A, 3B and a lens system 4 are arranged as shown in FIG. The lens system 4 is mounted as shown, and the lens system 4 is arranged so as to collect light reflected from characters, symbols, etc. on the form p.

Further, reference numeral 5 denotes a light receiving element 6 attached above the holder 2.
In this printed board, the light focused by the lens system 4 passes through a through hole 2a formed in the holder 2, and is received by a light receiving element 6, where it is subjected to photoelectric conversion.

Note that 7 is a cover that protects the light receiving element 6 of the printed board 5.

On the other hand, a concave bearing 8.8 is pivotally supported at the rear of the holder 2, and a bearing 9 is coupled by a spring 10 at a position facing the concave bearings 8,8.

Further, a bracket 11 is integrally attached to the rear of the holder 2, and a two-stage pulley 12 is pivotally supported on the bracket 11.
A pair of bearings 13.13 is provided and is connected by a spring 14.

Reference numeral 15 denotes a frame of an optical unit that constitutes a part of the reading device, and on the front side of this frame 15, two shirts 16A and 16B are horizontally suspended in parallel.

That is, one shirt (16A) is held between the concave bearings 8, 8 and the bearing 9.

That is, one shirt) 16A is held between the concave bearings 8, 8 and the bearing 9, and the other shirt) 16A is held between the concave bearings 8, 8 and the bearing 9.
B is sandwiched between the bearings 13 and 13.

Furthermore, a first detector for detecting the position of the reading section 1, for example, a microswitch 17, 17' is arranged at a distance above the frame 15, and is operated by the movement of the bracket 11. It has become.

Further, a servo motor 18 as a drive source is provided behind the frame 15, and drive units 19A and 19B are provided on both sides of the motor 18 to drive the motor.

Further, 20 is a wire drum pivotally attached to the servo motor 18, and this wire drum 20 is connected to the frame 1.
It is located on the front side of 5.

Further, two idle pulleys 21.21 and 21', 21' are pivotally supported at both end portions of the frame 15, respectively, and are located in front of the idle pulleys 21.21, 21', and 21'. a second detector 22, 22' for detecting runaway of the reading section 1, and a stopper 23, 23 for elastically stopping the reading section 1;
' is installed.

Furthermore, 24 is a wire, and one end of this wire 24 is fixed to the frame 15, and after passing it around the first stage of the two-stage pulley 12 attached to the bracket 11 that can be moved integrally with the reading unit 1, the wire 24 is connected to the frame 15. It is wound around the wire drum 20 a plurality of times via idle pulleys 21', 21' which are pivotally supported on the right side of the wire drum 15.

Therefore, the wire 2 wound around the wire drum 20
4 passes through an idle pulley 21.21 that is pivotally supported on the opposite side, that is, on the left side of the frame 15, and then extends to the second stage of the two-stage pulley 12, and then returns to the left side of the frame 15 and is tensioned by a spring 25. It's supposed to be forced.

(Refer to FIG. 6) That is, the reading section 1 is constructed by concave bearings 8, 8 that sandwich one shaft 16A on the upper side and a bearing 9 formed by tensioning a spring 10, and on the lower side the other shirt (16B). When the servo motor 18 is driven and rotates, the wire drum 20
Depending on the winding position of the wire 24, the reading section 1
(16A, 16B) is configured to be able to reciprocate in the left and right direction.

Next, the operation of the present invention based on the above configuration will be explained.

Now, when the servo motor 18 is energized by the reading symbol and rotates in the clockwise direction, the two-stage pulley 12 is moved to the right via the wire 24 wound around the wire drum 20, so the reading section 1 is also integrated. start moving in the same right direction.

Then, when the upper reading section 1 approaches the detector disposed at the right end of the frame 15, that is, the microswitch 17', and comes into contact with it, the microswitch 17' is turned on.

Then, since the detection signal from the microswitch 17' is transmitted to the servo motor 18 via the drive units 19A and 19B, the servo motor 18 is rotated counterclockwise and again at a constant speed.

That is, the servo motor 18 has a built-in controller (not shown), and changes during rotation are fed back to maintain constant rotation speed.

However, if the reading section 1 goes out of control due to an unexpected failure, the driving of the servo motor 18 can be stopped by the second detectors 22 or 22' disposed on both sides of the frame 15.

In addition, in the actual form reading section, the microswitches 17 and 17' are turned on by the reading end signal of the line to be read.
If the servo motor 18 is reversely rotated before this occurs, it is possible to avoid taking more time than necessary for reading.

Although one embodiment of the present invention has been described in which the motor, etc. that drives the reading section is arranged so as to be orthogonal to the optical path of the reading section, the present invention is not limited to this. Even if the arrangement is arranged, the same purpose can be achieved in a distant manner, and it goes without saying that various modifications can be made without changing the gist of the present invention.

As described above, the present invention is characterized in that the reading section is provided on a slidable shaft, and the reading section is reciprocated in the horizontal direction by a motor as a driving source via a wire.

Therefore, the entire optical reading unit that reads the form surface conveyed in a horizontal state in the row direction can efficiently and reliably scan the form, and it is also highly economical as it allows for miniaturization of the device and cost reduction. This has practical effects.

[Brief explanation of drawings]

Fig. 1 is a plan view of a reading unit drive mechanism showing an embodiment of the present invention, Fig. 2 is a front view of the same mechanism, Fig. 3 is a right side view of Fig. 1, and Fig. 4 is a plan view of the mechanism shown in Fig. 2. The right side view, Figure 5 is the left side view of Figure 2, Figure 6 is a front view showing how the wire of the same mechanism is wound around the wire drum, two-stage pulley, and idle pulley, and Figure 7 is the left side view of Figure 2. FIG. 3 is a perspective view showing a reading section of the same mechanism.

Claims (1)

[Scope of utility model registration request] A reading section having an illumination system and a lens system and having an idle pulley supported at its end; a shaft held by the idle pulley to guide the horizontal movement of the reading section; and a shaft for driving the reading section. A motor that can rotate in forward and reverse directions, a wire for transmitting the rotation of this motor to the reading section and moving it, a pulley that winds this wire in a horizontal state, and a reading start position and reading position in the row direction of the reading section. a first detector for detecting the end position; and a first detector disposed outside the first detectors for forcibly stopping the drive of the motor when the first detector does not detect the reading section. A drive mechanism for an optical reading device, comprising: a second detector; and a drive unit that drives the motor based on detection signals from the first and second detectors.