JPH084299B2 - Reader - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reader for information equipment such as a facsimile, and more particularly to a reader for performing sub-scanning by a linear pulse motor.

2. Description of the Related Art As is well known in the art, a linear pulse motor is a so-called linear pulse motor in which a conventional rotary pulse motor is developed on a straight line, and a large number of parallel grooves are formed as shown in FIGS. The scale 12 thus formed (the longitudinal cross section of the scale 12 has a comb-teeth shape as shown in FIG. 5) and the scale 12 are fixedly spaced on the scale 12 via guide rollers 14 and 14 as described later. And a slider 10 for running. The scale 12 corresponds to the stator of a conventional rotary pulse motor, and the slider 10 corresponds to the rotor. 21 is a table.

The slider 10 has a table 21 as shown in FIG.
Is formed by fixing electromagnets 23 and 24 having a U-shaped section to the different poles of the permanent magnet 22 provided at the bottom of the electromagnets 23 and 24, respectively. It is designed to move on the scale 12 by flowing.

For example, when a current in the direction is applied to the electromagnet 23, the coil 23a is wound in the opposite directions with the a pole and the b pole.
The magnetic force generated at the pole is added to the magnetic force of the permanent magnet 22 to take a position closest to and facing the tooth A on the scale 12, and becomes a stable state. On the other hand, the magnetic force generated at the pole b acts in the direction of canceling the magnetic force of the permanent magnet 22.

Next, when a current in the direction is applied to the electromagnet 24, the d pole and the tooth D attract each other, and the slider 10 moves to the right by one pitch P.
Move only 1/4.

Next, when a current in the direction is applied to the electromagnet 23, the pole b and the tooth B are
Are attracted to each other, the slider 10 further moves to the right by 1/4 pitch, and when a current in the direction is applied to the electromagnet 24, c
The pole and the tooth C attract each other and the slider 10 further advances by 1/4 pitch.

In this way, the current in the direction is again passed through the electromagnet 23, and then the current is similarly passed, whereby the slider 10 can be sequentially moved rightward at regular intervals.

The linear pulse motor that travels and moves in this way has been conventionally used for feeding a print head of a typewriter printer, for example.

In other words, in this type of usage example, one character is fed for each constant pulse, and after constant pulse input, printing is performed when the motor moves and settles, and then constant pulse input is performed again. This is a control means of a mechanism that repeats this sequentially, and a rising characteristic and a statically-determining characteristic (quick stop) are required as the characteristics of the linear pulse motor.

Therefore, the linearity during the movement from the stand-up to the static determination is not taken up as a problem, and the noise from the motor is not a problem because the printing noise of the conventional model is large. It was

In other words, the conventional linear pulse motors have been left with problems such as a rise characteristic and a static determination characteristic, and a large amount of noise due to poor linearity and vibration of the motor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a reading device using a linear pulse motor of this type, in which the above-mentioned motor noise is reduced and the linearity is improved.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a damping plate for suppressing the noise by pressing the vibration of a fixed scale on which a linear pulse motor runs, and a guide roller for the linear pulse motor. And fixed to the fixed scale.

Action With the above configuration, the vibration of the fixed scale is greatly suppressed, and the vibration generated by the motor is also suppressed.
Noise is reduced.

Also, because the damping plate comes into contact with the guide roller,
Friction loss increases, and linearity is improved during movement from standing up to settling.

Embodiment An embodiment of a reading device using a linear pulse motor according to the present invention will be described below in detail with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, 1 is a platen glass, 2 is a stationary document, 3 is a document holder, and 9 is a document reading optical unit.

The document reading optical unit 9 is composed of a fluorescent lamp 4, a reflection mura 5, a reading element 6, a condenser lens 7 and a drive circuit 8, and fixed adapters 11 and 11 are attached thereto.

Guide roller 1 of slider 10 to this fixed adapter 11,11
The shafts of 4a and 14b are bearings, and the guide rollers 14a and 14b are rotatable in contact with the fixed scale 12. In addition, 15 is a sleeve, 16 is a spring, 17 is a fixed base of the fixed scale 12, 18
Is a base, 19 is a rubber foot, and 20 is a glass stand.

13 is a damping plate for pressing the vibration of the fixed case 12 to reduce noise, and this damping plate 13 covers the surface of the fixed scale 12 opposite to the contact surface of the guide rollers 14a, 14b, The fixed sleeve is formed by bending the guide rollers 14a, 14b so that it comes into contact with a part of the outer surface of the guide rollers 14a, 14b.
It is attached and fixed to 12.

The linear pulse motor including the slider 10, the fixed scale 12 and the guide rollers 14a and 14b has the same structure and function as those described with reference to FIGS. 3 to 5. I will omit it here.

 Next, the operation of the reading device having the above configuration will be described.

The original 2 placed on the original table glass 1 is fixed by the original holder 3, the original 2 is illuminated by the fluorescent lamp 4, the reflected light is changed in optical path by the reflection mirror 5, and the condenser lens 7 is placed on the reading element 6. Collect through. The reading element 6 is electronically main-scanned by a drive circuit 8 to perform processing such as photoelectric conversion.

On the other hand, the sub-scanning is performed by moving the slider 10 to which the optical unit 9 is attached.

When the slider 10 travels on the fixed scale 12 by switching the excitation, the damping plate 13 mounted and fixed to the fixed scale 12 suppresses the vibration of the scale 12. According to the experimental results, it has been clarified that the noise can be improved by 10 to 15 dB as compared with the conventional one, and it becomes about 40 dB as a motor alone.

Further, the free end of the damping plate 13 having a U-shaped cross section is
Since they are in contact with the outer surfaces of the guide rollers 14a, 14b axially installed on the slider 10, the frictional energy between the free end of the damping plate 13 and the guide rollers 14a, 14b causes the vibration energy of the slider 10 generated during the switching of excitation to be lost. The vibration of the slider 10 is softened (this is called friction loss). The linearity is improved by this friction loss.

As the optical unit 9, an LED is used instead of the fluorescent lamp 4.
Of course, a contact type sensor using a light source or the like may be used.

Effects of the Invention In short, since the present invention mounts and fixes the damping plate on the fixed scale, it is possible to reduce the noise of the linear pulse motor during sub-scanning. Further, by bringing the damping plate into contact with the outer surface of the guide roller, there is an effect that the linearity of the slider can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram showing an embodiment of a reading device according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a schematic external view of a linear pulse motor. 4 is a front view of FIG. 3, and FIG. 5 is a schematic configuration diagram for explaining the electrical relationship between the slider and the fixed scale. 9: Original scanning optical unit, 10: Slider, 11 ...
Fixed adapter, 12 …… Fixed scale, 13 …… Damping plate, 14
a, 14b …… Guide roller.

Front Page Continuation (72) Inventor Toru Nakamura 1-191-1 Toba, Toba City, Mie Shinko Electric Co., Ltd. Toba Plant (72) Inventor Yoshizaki, 1-19 Toba, Toba City, Mie Shinkoden Machine Co., Ltd. Toba Factory

Claims (1)

[Claims] 1. A fixed scale arranged in the reading and scanning direction,
A slider that slides on the fixed scale via a guide roller, a linear pulse motor that slides the slider by switching the excitation on the fixed scale, and a surface other than the sliding surface of the fixed scale and an outer surface of the guide roller. A reading device comprising: a vibration damping plate that comes into contact with the slider and presses vibrations generated when the slider slides on the fixed scale; and an optical reading unit fixedly mounted on the slider.