KR940001529Y1 - Displacement gear device - Google Patents

Abstract

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Description

Gearbox Gear

1 is a schematic configuration diagram of a copier optical system.

2 is an operational state diagram of the transmission gear apparatus.

3 is a side view of the shift gear device.

Figure 4a is a partial cross-sectional view of the pulley and the motor gear in the maximum displacement state.

Figure 4b is a partial cross-sectional view of the pulley and the motor gear in the equal state.

* Explanation of symbols for main parts of the drawings

7: scanner 9: pulley

10: motor gear 11: detector

12: wire 13: sensing groove

14: sensing unit 15: angle

The present invention relates to a shift gear device for driving a scanner to secure an airspace required for changing a copying machine. In particular, the present invention relates to a copying shift gear device for enabling an accurate position restoration when the scanner moves to an equal position after shifting. It is about.

The prior art related to the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is a schematic configuration diagram of a copier optical system, in which 1 to 4 are reflectors, 5 are lenses, 6 are contact glass, 7 are scanners, and 8 are drums.

Usually, the coated object is placed on the glass plate 6 and the image is formed on the drum 8 through the reflecting mirrors 1, 2, 3 → lens 5 → reflecting mirror 4. At this time, the difference in the airspace field according to the case of the uniform copying and the variation copying is required, and the difference in the airspace is controlled by the movement of the scanner 7 to which the reflectors 2 and 3 are attached. Here, the airspace field means the distance from the coated object to the image formed on the drum 8.

2 is an operation state of the shift gear device which is the scanner 7 moving device, 2a is an operation state at the time of equal displacement, 2b is an operation state at the maximum displacement, 2c is an operation state at the time of malfunction of the pulley, 3 is a side view of the shift gear device. In the figure, 9 is pulley, 10 is motor gear, 11 is detector, 12 is wire, 13 is detection groove, 14 is detection part of detector, 15 is angle, A is equal to The distance B represents the distance between the pulley and the scanner at maximum displacement, and C represents the distance between the pulley and the scanner during malfunction.

As shown in FIG. 2A, the detector 14 of the detector 11 is placed at the same position as the detection groove 13 of the pulley 9, and the detector 11 outputs an operation output. For shifting, the scanner 7 must be moved in the direction of the arrow in the figure, in which case power is transmitted from the motor gear 10 to the gear of the pulley 9. The motor gear 10 transmits power to rotate the pulley 9 in a counterclockwise direction. As a result, the detector 11 generates a non-operational output by the movement of the sensing groove 13. In the case of restoring from the state of shifting to the state of equalization, the pulley 9 receives the rotational power in a clockwise direction, and returns to the position at the time of rearing while winding the wire 12 connected to the scanner 7, and the sensing groove 13 At the same time as the sensing unit, the detector 11 is operated again to give an operation output. Therefore, the scanner position setting at the same time is determined by the operation output of the detector 11.

Figure 2b shows the operation at the maximum shift, the sensor groove 13 of the pulley (9) in the maximum shift state by rotating less than one rotation from the position at the same time, the output of the detector 11 during the shift Gives inactive output. As a result, restoring the position from the shifting operation of the scanner 7 to the equalizing operation is configured so that the sensing groove 13 of the pulley 9 matches with the position of the sensing unit 14 only at the same time, and the detector 11 By stopping the operation of the motor gear 10 at the moment of detecting the log match state, it was restored to the correct equal position.

However, when copying at the maximum shift state (especially when the scanner 7 is reversed), if the momentary change amount (shock amount) of the scanner 7 is transmitted to the pulley 9 through the wire 12, the pulley (9) may be rotated in an undesired direction as shown in FIG. 2C to be in a malfunctioning position.

In this malfunctioning state, restoration to the equal position is required, and the pulley 9 should be rotated by one or more revolutions to restore the position of the scanner 7. The pulley 9 has a clock to restore the scanner 7 to the equal position. Even if only a predetermined angle 15 rotates in the direction, the detection groove 13 is detected by the detector 11 to stop the movement of the scanner 7. This results in no focus at all when copying, and again causes a problem in that the motor, the motor gear 10, the pulley 9, etc. are damaged when the shift operation is performed again.

Accordingly, an object of the present invention is to provide a variable displacement gear device which is designed to solve the problems of the prior art, and is configured to prevent a malfunction of the position restoration of the scanner due to a momentary change in the movement of the scanner.

In order to achieve the above object, the present invention provides a wire connected to the scanner, and a sensing groove is installed so that rotation can be detected while the wire is connected to the scanner to accurately restore the position of the scanner when the shift function and the equal function are alternately performed. In the gear shift gear device comprising a pulley having a gear on the other side of the wire, a motor gear connected to the pulley to transmit a driving force, and a sensing means for detecting the rotation of the pulley to control the driving force applied to the pulley, In a shift gear device comprising a sensing means for detecting the rotation of the scanner to control the driving force applied to the pulley, the rotation of the pulley for moving the scanner through the wire, the scanner is moved to the maximum shift state in the equal state The locking jaw on the gear of the pulley is impossible to rotate more than Configured to form.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 4.

4A is a partial cross-sectional view in which the pulley 9 and the motor gear 10 are engaged in the maximum shift state, and FIG. 4B is a partial cross-sectional view in the equal shift state, where 90 is a loose gear and 91 is a locking step, respectively.

Malfunction of the gearshift gear device occurs at the time of transfer from the maximum shift state to the equal shift state or from the equal shift state to the shift state, the prevention of which does not exceed the rotation of the pulley 9 by one turn from the position of the equal shift state. It is possible to reliably limit it to the range which does not.

According to this basic principle, in one embodiment of the present invention, as shown in Figure 4a, the locking jaw 91 is formed to prevent the pulley 9 from rotating in the direction of more than one rotation no longer in the maximum displacement state. As illustrated, the locking jaw 91 is formed to be set at the correct position in the equal position. In the present invention, as a preferred embodiment, two teeth of a gear are realized.

In this way, the above configuration is effective when the scanner 7 is shifted from the equal state to the variable state.

Therefore, the present invention constructed and operated as described above has the effect of achieving a malfunction that may occur when the scanner is moved from the same to the other side of the copier, or from the side to the same side by simply modifying the device.

Claims (1)

In order to restore the correct position of the scanner during the shifting operation of the shifting function and the equalizing function in the copier, a wire 12 connected to the scanner 7 and a sensing groove 13 to detect rotation of the wire 12 are detected. To detect the rotation of the pulley (9) having a gear formed on the other side to which the wire 12 is caught, the motor gear (10) connected to the pulley (9) to transmit a driving force, and the pulley (9) In the shift gear device comprising the sensing means 11 for controlling the driving force applied to the pulley 9, the rotation of the pulley 9 for moving the scanner 7 through the wire 12 is equalized. The gear shift gear device of the copier, characterized in that for forming a locking jaw (91) on the gear of the pulley (9) to be impossible to rotate more than the rotation to move the scanner (7) to the maximum shift state.