KR870001908B1 - Stabilized driving device for copy machine - Google Patents

Abstract

The unit is designed to reduce the inertia of the optical system at the initial and final stages of its forward and backward drivings and consequently reduce the load applied to the drive motor. The unit includes two pairs of racks(16,17) and (18,19) arranged in two lines at the initial and final drive positions of No. 1 and No. 2 movable mirror units(13) and (15) respectively moving on guides (12) and (14) and having shafts(20) and (21) extending to have pinion gears(22) and (23) to engage with racks(16,17) and (18, 19).

Description

Stable driving device of copier optical system

1 is a schematic diagram of a copier optical system.

2 is a graph showing the speed form of the optical system driving device.

Figure 3 is a schematic plan view showing the main part of the stability drive device of the present invention with a part of the optical system.

4 is a schematic plan view similar to FIG. 3 showing a state where the position of the optical system is changed.

* Explanation of symbols for main parts of the drawings

10 frame 11 front wall

12: guide shaft 13: first movable reflector assembly

14: guide 15: second movable reflector assembly

16,17,18,19: rack 20,21: axis

22,23: Finney get 24,25: coil spring

The present invention relates to a stable driving device of the copier optical system, and more particularly, to a stable driving station of the copier optical system that can be driven by reducing the inertial force of the optical system at the beginning and end of the forward or backward drive.

In general, in equal and variable copiers, the optical system scans the front of the document to form images on the drum.The optical system has inertial forces at the beginning and the end of forward or backward driving, so it accelerates at the beginning and the end of forward and backward driving, respectively. Since the time and the deceleration time become longer, the copier space becomes large, and radiation has a problem in miniaturizing the entire configuration.

In view of this, there is one known conventional technique in which a brake station is added to an optical system driving motor, and there are also several methods of modifying the motor-brake assembly. All of them use a friction member that can apply friction to the rotating member of the motor.

However, in the related arts, since the configuration in which the friction member is added is generally complicated and the friction control method is applied, excessive load is applied to the motor or the rotating member coupled thereto, so that the wear cannot be avoided, and in particular, the acceleration and deceleration time of the motor is reduced. There is a drawback that it cannot reduce the effective space of the copier.

An object of the present invention is to reduce the inertial force of the optical system at the beginning and the end of the forward or backward drive of the optical system, thereby reducing the load of the optical system driving motor and providing a safe driving station of the copier optical system which can be driven stably. It is.

Another object of the present invention is to reduce the effective space of the copier, to prevent the driving optical system from colliding with the side wall, and to prevent the shock and vibration caused by the change of direction at the end of the forward drive and the start of the reverse drive of the optical system Absorption is to prevent shaking of the entire copier.

Still another object of the present invention is to prevent the optical system driving motor from being subjected to excessive load and to allow the optical system to scan a copy document without vibration.

Referring to the present invention in more detail based on the accompanying drawings as follows.

1 schematically shows the optical system structure of the copier 1, in which an original 2 is fixed to an upper surface thereof, and a drum 3 is rotatably mounted therein. In this drum, the first movable reflector 4 and the pair of second movable reflector 5 are arranged so as to be linearly movable at different speeds, and the image of the document scanned by the first movable reflector 4 is the second movable reflector 5. ) Is imaged on the drum 3 by three fixed reflectors 7, 8, and 9 fixedly mounted through the lens 6.

In general, the speed of the first movable reflector 4 is twice as fast as that of the second movable reflector 5.

However, as is known, the drive source for driving these first and second movable reflectors 4 and 5 is one drive motor.

This drive motor drives the first movable reflector 4 and the second movable reflector 5 back and forth, the speed of which is explained in FIG. Here, the forward and backward drive speeds by the prior art motor drive are shown by the solid line, and the form of the speed desired by the present invention is shown by the dotted line. As can be seen from these two speed forms, the form of the present invention at the beginning and end of forward and backward driving is that the acceleration and deceleration slope is faster than that of the prior art.

Specific embodiments of the present invention for obtaining this type of velocity are shown in FIGS. 3 and 4.

3 and 4, the copier frame 10 is mounted with a guide shaft 12 parallel to the front wall 11, through which the first movable reflector assembly 13 and the guide 14 are mounted. The second movable reflector assembly 15 is adapted to be guided. As already mentioned, these first and second movable reflector assemblies 13, 15 drive forward and backward at different speeds. 3 shows that they are in the forward drive start position and the reverse drive end position, and FIG. 4 shows that they are in the forward drive end position and the reverse drive start position.

Means for accelerating the acceleration and deceleration tilt at the beginning and end of the forward and backward drive as shown by the dashed line in FIG. 2 are also shown in FIGS. 3 and 4.

That is, between the guide shaft 12 and the front wall 11, the forward drive start position (or reverse drive end position) and the forward drive end position (or reverse) of the first and second movable reflector assemblies 13 and 15 are reversed. Two sets of racks 16, 17, 18 and 19 are arranged in two rows, respectively, and the first and second movable reflector assemblies 13 and 15 have shafts 20 respectively. The finierders 22 and 23 are arranged in a row. Coil springs 24 which are wound or unwound as shafts 20 and 21 rotate as the pinions 22 and 23 engage with racks 16, 17 and 18 as energy storage means. (25) is wound.

These coil springs (24), (25) are the shaft (20), without applying any force, i.e. rotational force, at the intermediate position of the forward and backward driving of the first and second movable reflection assembly (13), (15). It is inserted in 21.

In operation, the pinion 22 when the first and second movable reflector assembly 13, 15 is moved from the above-mentioned intermediate position to the position of the third degree, that is, the forward drive start position (or reverse drive end position). The coil springs 24 and 25 are wound (which is defined for convenience and may be loosened) as the 23 and 23 rotate in bite with the racks 16 and 17, and the first and second movable reflector assemblies ( 13) and (15) apply a braking force to speed up the deceleration and at the same time save energy. When it is moved from the position of FIG. 3 to the position of FIG. 4 again, the acceleration slope until the normal driving is accelerated by the release of the low energy by the return of the coil springs 24 and 25. In the position of FIG. 4, the pinions 22 and 23 engage with the racks 18 and 19 of the other pairs, and the braking force of the coil springs 24 and 25 acts to speed up the deceleration. When moving from the position to the third degree position, the acceleration time as mentioned above can be increased to obtain the driving speed form as shown in FIG.

The effect of the present invention is that the driving motor of the optical system can reduce the starting time and the braking time by the latent elastic force of the spring can reduce the effective space of the copier, and can prevent the optical system from colliding with the side wall of the copier frame In addition, the entire copying machine is prevented from shaking and the optical system is not subjected to excessive load, so that the image of the original can be scanned without vibration by stable driving.

Claims (1)

A guide shaft 12 parallel thereto is installed inside the front wall 11 of the copier frame 10, and through this, the first movable reflection assembly 13 and the second movable reflection assembly assembled to the guide 14 are mounted. 15), the forward drive start position and the forward drive end position of the first and second movable reflector assemblies 13 ', 15 between the guide shaft 12 and the front wall 11; Two sets of racks 16, 17 and 18 and 19 are arranged in two rows, respectively, and the first and second movable reflector assemblies 13 and 15 have shafts 20 and 21 associated with each other. Pins 22, 23, which can be mated with racks 16, 17, 18, and 19, and the coil springs 24, A stable driving device of a copier optical system, characterized in that the mounting (25) is mounted so that it can be affected by the rotation of the pinions (22), (23).

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