JPH06301119A - Variable power mechanism for copying machine - Google Patents

Abstract

PURPOSE:To provide a variable power mechanism of a copying machine easy to assemble and adjust and capable of being miniaturized. CONSTITUTION:The variable power mechanism of a copying machine for moving a moving mirror based on the movement of a copying lens is provided with a base 15, a rocking member 20 rotatable centering on a rotary shaft 23 on the base 15, a cam follower 22 and a gear 21 on the rocking member 20, a cam 32 coupled with the cam follower 22 in the fixed relation with a copying lens 11, a pinion 16 coupled with the gear 21 on the base 15, and a rack 18 coupled with the pinion 16 in the fixed relation with a moving mirror 12. The movement of the copying lens 11 is transferred to the rocking member 20 via the cam 32 and the cam follower 22, and the movement of the rocking member 20 is transferred to the moving mirror 12 via the gear 21, the pinion 16, and the rack 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zooming mechanism of a copying machine for moving a moving mirror based on the movement of a copying lens.

[0002]

2. Description of the Related Art In a variable power mechanism of a copying machine, a movable lens portion moves linearly according to a magnification, while a movable mirror portion makes a complicated movement to adjust a conjugate length according to the movement of the movable lens portion. . In the relative motion with respect to the substrate, for the 1 × state,
Both reduction and enlargement work in the same direction.

In the conventional zooming mechanism, the movable lens portion and the movable mirror portion are connected by a wire and a pulley. By eccentricizing the pulley around which the wire is wound, the above-mentioned complicated movement is transmitted to the movable mirror portion.

[0004]

However, the variable power mechanism using the eccentric pulley and the wire is structurally large in size, which is an obstacle to downsizing the copying machine. Further, since it is necessary to pay attention to setting the length of the wire and maintaining the tension thereof, the assembly and the subsequent adjustment are complicated and troublesome. Further, there are also inconveniences such as not being easy to change the design.

In view of the above problems of the prior art, it is an object of the present invention to provide a variable power mechanism for a copying machine which can be easily assembled and adjusted and which can be miniaturized.

[0006]

According to the present invention, a moving mirror is moved based on the movement of a copying lens to make a variable magnification mechanism of a copying machine for obtaining a variable magnification copy, which is rotatable about a rotary shaft 23. The swing member 20 is provided, and the swing member 20 is provided with a cam follower 22 and a gear 21. The cam 32 that engages with the cam follower 22 is attached to the copy lens unit 11.
The pinion 16 engaging with the gear 21 is provided in a fixed relationship with the moving mirror 12, and the rack 18 engaging with the pinion 16 is provided in a fixed relationship with the moving mirror 12.
2 and the cam follower 22 are transmitted to the swing member 20,
Copying characterized in that the movement of the oscillating member 20 is transmitted to the moving mirror by a necessary amount of movement for correcting the conjugate length of the optical system due to the movement of the copying lens by the gear 21, the pinion 16 and the rack 18. The main feature is the variable power mechanism of the machine.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram showing a main part of a copying machine to which the variable power mechanism of the present invention is applied, and FIG. 2 is a plan view showing a preferred embodiment of the variable power mechanism according to the present invention.

The copying machine 1 has a light source 3, a scanning mirror 4, a scanning interlocking mirror section 5, and a scaling mechanism section 10 for performing enlargement copying and reduction copying, and the information of the original 2 is magnified at a desired magnification. It is configured to be transferred onto the photosensitive drum 6.

The zooming mechanism section 10 is a mechanism for moving the moving mirror 12 in accordance with the movement of the copying lens 11. The copy lens 11 is fixed to the long side of the L-shaped member 13. The short side of the L-shaped member 13 is fixed to the slide member 30.

FIG. 3 is a side view showing the slide member 30 as viewed from the back side of FIG. In FIG. 3, a rack 31 continuous from one end to the other end is formed on the slide member 30. The pinion 33 is engaged with the rack 31,
The slide member 30 is moved to the arrow A or B by the pinion 33.
Driven linearly in the direction. The pinion 33 is rotationally driven by a motor (not shown).

A cam groove 32 having a predetermined shape is formed on the side surface of the slide member 30. The cam follower 22 of the swing member 20 is engaged with the cam groove 32.

The swinging member 20 is rotatably set on a base plate 15 provided in a fixed relationship with the apparatus main body.
The swinging member 20 has a slightly bent dogleg shape at a rotation shaft 23 at the center thereof, and is rotatable about the rotation shaft 23.

A cam follower 22 that engages with the cam groove 32 is formed at one end of the swing member 20. The cam follower 22 has a cylindrical shape, and its central axis is the rotation axis 23.
It is parallel to.

The other end of the rocking member 20 has a small fan shape, and a gear 21 is formed on the circumference of the fan shape. The gear 21 is a pinion 16 mounted on the base plate 15.
Is engaged with. The rocking member 20 rotates within a range in which the gear 21 and the pinion 16 are engaged with each other.

A slide member 17 for a mirror is arranged on the side of the pinion 16. Mirror slide member 1
A rack 18 is formed on the side of 7 and the rack 18 and the pinion 16 are engaged with each other (see FIGS. 2, 4 and 5). The slide member 17 for the mirror has a mirror mounting member 1
4 is integrally fixed, and the movable mirror 12 is attached to the mirror attachment member 14. The mirror slide member 17 and the mirror mounting member 14 are guided so as to move in parallel with the slide member 30.

Next, the operation of the variable power mechanism 10 will be described.

When the gear 33 is driven by the motor, the slide member 30 moves in the arrow A or B direction. When the slide member 30 moves, the swing member 20 rotates around the rotation shaft 23 due to the interaction between the cam groove 32 and the cam follower 22.

For example, consider the case where the cam follower is at the position 22a in FIG. This corresponds to the state shown in FIG. At this time, when the slide member 30 moves in the direction of arrow B, the swing member 20 turns in the direction of arrow C in FIG. 4, the gear 16 rotates clockwise, and the mirror slide member 17
The moving mirror 12 slides in the direction of arrow E.

Further, for example, in FIG.
Considering the case at the position of b, this corresponds to the state of FIG. At this time, when the slide member moves in the direction of arrow A, the swinging member 20 turns in the direction of arrow D, the gear 16 rotates counterclockwise, and the moving mirror 12 slides in the direction of arrow F.

As described above, in the variable power mechanism of the present invention,
The form of movement of the moving mirror 12 with respect to the movement of the copying lens is determined by the interaction between the cam (groove) 32 and the cam follower 22. Therefore, by changing the shape of the cam 32, it is possible to freely set the mode of movement of the moving mirror 12. Further, since the pinion 16 has the same rotation axis and is composed of two gears having different radii, the movement amount of the mirror slide member 17 with respect to the rotation angle of the swing member 20 can be amplified, and It is easy to further downsize the double mechanism. That is, it is possible to easily change the design of the variable power mechanism of the present invention.

Further, by providing the rotating shaft 23 and the pinion 16 on the common independent base 15, the position with respect to the cam 32 and the rack 18 is adjusted while maintaining the relative relationship between the swinging member 20 and the pinion 16. be able to.

First, although it is unnecessary to adjust the engagement state of the swing member 20 and the pinion, the engagement state of the cam follower 22 with the cam 32 and the rack 1 of the pinion 16 are eliminated.
The engagement state with 8 can be easily adjusted, and assembly and adjustment are extremely easy.

For example, the correction characteristic of the moving mirror can be changed by changing the engagement position between the cam follower 22 and the cam 32 without changing the state of the optical system.

[0024]

According to the variable power mechanism of the copying machine of the present invention, in the variable power mechanism of the copying machine for moving the moving mirror based on the movement of the copying lens, the base 15 is provided, and the rotating shaft 23 is centered on the base 15. Is provided with a rotatable rocking member 20, a cam follower 22 and a gear 21 are provided on the rocking member 20, and a cam 32 that engages with the cam follower 22 is provided in a fixed relationship with the copy lens 11 and engages with the gear 21. The pinion 16 is provided on the base 15, the rack 18 engaging with the pinion 16 is provided in a fixed relationship with the moving mirror 12, and the movement of the copy lens 11 is controlled by the cam 32 and the cam follower 22.
To the gear 21, the pinion 1
Since it is configured to be transmitted to the moving mirror by means of 6 and the rack 18, the assembling and adjustment are easy and the size can be reduced. Further, it is possible to easily deal with a design change of the variable power mechanism.

The present invention is not limited to the above embodiment. For example, the cam follower may be configured as a rotatable roller. Further, the swinging member may be provided with the rotary shaft at the end and both the cam follower and the gear may be arranged on the same side.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a main part of a copying machine to which the present invention is applied.

FIG. 2 is a plan view showing a variable power mechanism of the copying machine of the present invention.

FIG. 3 is a plan view showing the slide member of FIG.

FIG. 4 is a plan view showing the swinging member of FIG. 2 and its surroundings.

FIG. 5 is a plan view showing a swing member and its surroundings in a state different from that of FIG.

[Explanation of symbols]

 11 Copying Lens 12 Moving Mirror 15 Base 16 Pinion 18 Rack 20 Swinging Member 21 Gear 22 Cam Follower 23 Rotating Shaft

Claims (2)

[Claims] 1. A zooming mechanism of a copying machine for moving a moving mirror based on a movement of a copying lens, wherein a swinging member (20) rotatable about a rotation shaft (23) is provided, and the swinging member (20) is provided. (20) is provided with a cam follower (22) and a gear (21), and a cam (32) that engages with the cam follower (22) is provided in a fixed relationship with the copy lens unit (11). 21) is provided, a pinion (16) engaging with the pinion (16) is provided, a rack (18) engaging with the pinion (16) is provided in a fixed relationship with the moving mirror (12), and the movement of the copying lens (11) is performed with the cam (32). The cam follower (22) transmits it to the swing member (20), and the movement of the swing member (20) is transmitted to the gear (21) and the pinion (1).
6) and a zoom mechanism for a copying machine, characterized in that the rack and the rack (18) are used for transmission to a moving mirror. 2. A variable power mechanism for a copying machine according to claim 1, wherein the rotating shaft (23) and the pinion (16) are provided on a common independent base (15).