JPS5826013B2 - Vibration damping device for copying machine exposure and transmission system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration damping device for a moving system in a copying machine exposure scanning system, particularly in a machine in which a document and an exposure scanning system move in parallel.

In this type of machine, whether it is a fixed document-exposure scanning motion system or a fixed document movement-exposure scanning system, as the demand for higher speeds becomes increasingly strict, the reciprocating parts perform rapid acceleration and deceleration. As a result, vibrations occur and, in the case of continuous copying of a large number of sheets, there are cases where the machine restarts before the vibrations are sufficiently damped.

Furthermore, vibrations are also generated due to unevenness on the surface of the guide rail that supports the moving system.

This leads to disturbances in copy image quality.

Therefore, in order to prevent this, efforts are being made to reduce the weight of the reciprocating part, but there are limits to this.

In addition, shock absorbers were installed at the end of the movement to absorb vibrations, but these also led to larger and more expensive machines and were not sufficiently effective.

Therefore, when considering the vibration components that affect copy image quality, we find that, for example, in a machine with a movable optical system with a fixed document table as shown in Figure 1, vibrations in the direction perpendicular to the moving direction of the endoscope of the optical system are suppressed. I know it's good.

Furthermore, in a machine with a moving document table and a fixed optical system system, it is sufficient to suppress vibrations in a direction perpendicular to the plane in which the document table moves.

Other types of vibrations are less likely to occur due to the structure, but even if they occur, they can be suppressed to the extent that they do not seriously affect the copy image quality.

In FIG. 1, a is a frame, b is an original, C is an exposure scanning system, and d is a mirror.

The present invention has been made in view of the above circumstances, and its purpose is to strongly attenuate vibration components of a moving system in a direction perpendicular to the moving direction thereof, and to provide a compact and high-speed system. An object of the present invention is to provide an allocation device for an exposure scanning system of a copying machine that makes it possible to obtain good copy image quality in a copying machine.

Hereinafter, the present invention will be explained with reference to the drawings.

In the case of a moving optical system/fixed document table type, a carriage 2 for a movable mirror 4, that is, a movable system A is mounted on the rails 1, 1'.

That is, sliders 31, 3□' made of nylon or the like are attached to the frame portion B at both ends of the carriage 2, and these sliders 31 + 31 are attached to the sliding surfaces la, 1' of the rails 1, 1'.
It is in sliding contact with la'.

Furthermore, support plates 5.5' made of elastic members C are attached to both ends of the carriage 2.
5' has slider 3□, 3! is installed, slider 3□
, 32' are installed, and sliders 32+32 are attached to rail 1.
, 1' in sliding contact.

Further, the frame portion B and the support plates 5, 5' are connected by dash boards) 6, 6'.

When the carriage 2 is accelerated or decelerated, vibrations occur in all directions and affect the copy image quality, but it is mainly the vibration components perpendicular to the direction of movement that cause problems.

Therefore, if the spring constants of the support plates 1-5 and 5' that support the vibrators 32+37 that eat the rails 1 and 1' are pressed down as a dog, the distribution effect will be a dog. It becomes extremely difficult to adjust the balance of +32 frictional forces.

In other words, if the clamping force F1 for the rails 1, 1' is a spring constant, and the displacement of the support plates 5, 5' is X, then as is clear from Hooke's law, if F=X and the spring constant is large, then If there is a slight change in X, the tightening force F will vary greatly, and the movement of the carriage 2 will lack smoothness.

Furthermore, it is difficult to adjust the tightening force F for both rails 1, 1'.

Therefore, in the case of the present invention, the spring constant of the support plate 5° 5' is set as small as possible to easily adjust the tightening force.
Therefore, the vibration component perpendicular to the direction of movement of the carriage 2 that would otherwise occur is suppressed by the dashpot 6°6'.

These dash boards) 6 and 6' provide resistance according to the vibration speed of the carriage 2 between the carriage arms 2a+2a' and the support plates 1-5.5', so the sliders 31+31' are always kept in the sliding position of the guide rails 1 and 1'. Moving surface 1 a l 1 a'
maintain contact with.

Also, slider 31 + 32 + 3'l + 3'2
Since the frictional force between the carriage 2 and the rails 1 and 1' is reduced and the movement speed of the carriage 2 does not fluctuate, vibrations in the movement direction of the carriage 2 can also be suppressed.

What is shown in FIG. 3 shows another embodiment of the present invention, in which the other side of the carriage 2 is fitted to the rail 1 via a friction ring 8, and the other configuration is the same as the above-mentioned embodiment of the present invention. It is the same as that of

It goes without saying that the vibration damping device of the present invention can be used not only to damp the carriage of a moving optical system, but also to damp the vibration of a copying machine in which the original stage is moved.

Since the present invention has been described in detail above, it is possible to strongly attenuate the vibration component in the direction perpendicular to the moving direction of the moving system A, and it is possible to achieve good copy image quality in a small and high-speed copying machine. Obtainable.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an exposure scanning system of a copying machine with a fixed document table and a moving optical system, and FIG. 2 is an explanatory diagram of the configuration of an embodiment of the present invention.
FIG. 3 is a configuration explanatory diagram of another embodiment of the present invention. A is a moving system, B is a frame part, C is an elastic member, 1.1
'' is the guide rail, 6.6' is the dashpot.

Claims (1)

[Claims] 1. The guide rail 1゜1' on which the moving system A is placed and moved is loosely held between the frame portion B of the moving system A and the elastic member C provided on the frame portion B, and the frame portion B and the elastic member C are A vibration damping device for an exposure scanning system of a copying machine, characterized in that dashpots 6 and 6' are interposed therebetween.