JPS6278540A - Optical section driving device in copying machine - Google Patents

Abstract

PURPOSE:To prevent rising up of an optical section surely by attaching pulleys rotatable in a horizontal plane to both ends in the direction at right angles to the direction of exposure of an optical section supporting frame, and winding driving wires in vertically reverse direction to the two pulleys. CONSTITUTION:Driving wires 69, 70 are wound in vertically reverse direction to pulleys 53, 54 attached rotatably to both ends of the body 51 of a supporting frame 51. Accordingly, when driving force is applied by the driving wires 69, 70, upward turning force acts on one pulley around the center of gravity, and downward turning force acts on another pulley around the center of gravity. Accordingly, the two turning forces cancel each other, and action of upward or downward turning force on the body 51 of the supporting frame can be prevented surely.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an optical part drive device in a copying machine, and more particularly, to an optical part drive device that reciprocates an optical part in order to expose a document.

<Prior Art> Conventionally, there have been two types of copying machines: one in which the original is exposed by reciprocating the original platen on which the original is set, and the other in which the original is exposed by reciprocating the optical part. Widely used.

Among these, the type that moves the optical part back and forth has the advantage of simplifying the configuration and easily setting the moving speed of the light source and the moving speed of the reflecting mirror in the relationship of 1 = 2. Focusing on this, the power from the drive source is transmitted using wires. There has also been provided an apparatus in which the driving force is transmitted by wires that are laid out on both sides of the optical part, thereby suppressing exposure defects caused by twisting of the optical part or the like. In this case, 1. The driving force is transmitted by a wire, and the exact vertical position E1. For IJ Ill, the optical part is supported by its own weight on the guide rail, pulleys are attached to both ends of the support frame that supports the optical part, and driving wires are wound around both pulleys. be.

Conventionally, the wires are wound around both pulleys by: (1) making both pulleys rotatable in a vertical plane, and applying a downward force to both sides of the wire held in the pulleys, which causes the support frame to float; (Refer to Japanese Unexamined Patent Publication No. 58-37669), and ■ Both pulleys are rotatable in a horizontal plane, wires are placed in the pulleys in the same direction above and below, and the center of gravity of the support frame is By setting the center of gravity of the pulley and the center of gravity of the pulley to be at the same height position, it is possible to prevent the action of biased driving force and to prevent the support frame from lifting (Japanese Patent Laid-Open No. 58-1
56965)).

<Problems to be Solved by the Invention> In the case of the optical drive device having the configuration described in (1) above, the pulley is generally attached to the outside of the side plate that surrounds the support frame. However, there is a problem in that the range in which electrical components can be mounted is narrowed by the range determined by the diameter of the pulley and the distance traveled by the optical part.

In particular, since the diameter of the pulley is quite large compared to the width, the above-mentioned narrowing range is quite large, and this is a problem that cannot be ignored from the perspective of improving space utilization efficiency.

In addition, in the case of the optical drive device having the configuration described in (■) above, even though the center of gravity of the support frame and the center of gravity of the pulley are set at the same height, the position where the driving force from the wire is applied is within the support frame. It cannot be expected that the height of the center of gravity of the wire matches the height position of the center of gravity of the
(The above center of gravity is in the middle of the wire pitch), but since the direction of the wire relative to both pulleys is the same, a biased tensile force acts on the support frame. There is a problem in that it will be lifted off the guide rail.

This invention was made in view of the above problems,
It is an object of the present invention to provide an optical part drive device in a copying machine that can improve space utilization efficiency inside a copying machine main body and can reliably prevent the optical part from floating up.

Means for Solving the Problems> In order to achieve the above object, the optical part driving device of the present invention has a support frame that supports the optical part, at both ends in a horizontal plane in a direction perpendicular to the exposure direction. It is equipped with rotatable pulleys, and the drive wires are placed upside down relative to both pulleys.

<Function> With the optical unit drive device having the above configuration, the drive wires are housed upside down relative to the pair of pulleys attached to both ends of the support frame, so the direction of movement is as follows: By applying the same driving force, the optical section can be moved without twisting the support frame, and in the vertical direction, by applying forces in opposite directions, the support frame can be stabilized on the guide member. It can be in a state where it is supported by.

More specifically, the distance between the drive wires and the pulleys is 2r, and the tensile forces in opposite directions exerted by the drive wire on one pulley are f 1
．． f 2 (see Figure 5), and the oppositely directed tensile forces exerted by the drive wire on the other pulley are f 3. f 4 (see Figure 6), then ft, :f3. Since f2' and f4, the moment acting on the entire support frame is r (fl - f2 ) - r (f3 - f4 ) = r
(fl-f3)-r(f2-f4), which is a very small value, so that the support frame can be stably supported by the guide member.

<Example> Hereinafter, embodiments will be described in detail with reference to the accompanying drawings showing examples.

FIG. 7 is a schematic diagram showing the internal configuration of the copying machine.

(1) is the main body of the copying machine, the interior of which is divided into an upper chamber (12) and a lower chamber (13) by a partition plate (11), and an optical system for scanning and exposing a document (D) in the upper chamber (12). (21), and a copy processing section (4) for forming a copy image on copy paper (P) and a copy paper transport section (8) are provided in the lower chamber (13).

Here, the optical system ('2J) includes a light source (21) composed of a light emitter (31), a main reflector (32), and a sub-reflector (33), a flat reflector (22) (23N24), having a lens (25) and a plane reflective &i (26);
Light source (21) and plane reflector (22) (23) (24
) in the direction shown by arrow A, the document (D) on the contact glass (14) can be scanned and exposed. Then, the light source (21) and the plane reflecting mirror (22) move together, and the plane reflecting mirror (23) (
24) also move together, and the moving speed of the former is set to be twice that of the latter. In the following explanation, the light source (21) and the plane reflecting mirror (22) (
23) (24) is collectively referred to as the optical section (2').

In addition, the copy paper conveyance section (8) includes a paper feed roller (81
), a paper feed path (83), a transport roller (85), a registration roller (86), a heat fixing roller (88), and an ejection roller (89), and by driving the paper feed roller, the paper feed cassette Take out a single sheet of copy paper (P) from (16), guide it to the copy processing section (4), transfer the toner image,
Although the configuration is such that the toner image is heated and fixed by the heating fixing roller (88) and then discharged onto the pedestal (18), the configuration is not limited to this configuration. It is also possible to use a copy paper conveyance section having other conventionally known configurations, such as a configuration in which the ejection sides are on the same side. The copy processing section (4) includes a photosensitive drum (41) that rotates in the direction shown by C in the figure, a charger (42), a blank lamp (B), a developing device (43), and a transfer charger (44). ), separation member (45), and cleaner (46
) are arranged in this order, and the original w1@ is imaged on the outer surface of the photoreceptor drum (41) which is uniformly charged by the charger (42) to form an electrostatic latent image. A blank lamp (B
), the developing device (43) develops the toner image, the transfer charger (44) transfers the toner image onto the copy paper (P), and the remaining toner is removed by the cleaner (
46), but the configuration is not limited to this configuration, and it is also possible to use a copying processing unit with other conventionally known configurations, such as one using a belt-shaped photoreceptor. . Figure 1 is anti-m! ! (23) An exploded perspective view showing the support frame (5) with (24) attached, FIG. 2 is a plan view, and FIG. 3 is a side view. 23H24), and a pair of slide members (52) at a predetermined position on one end.
and one pulley (53) is attached, and one pulley (54) is attached at a predetermined position on the other end. and,
A pair of slide members (56) are provided at predetermined positions of the end member (55) rotatably connected to the support frame main body (51).
is installed. In addition, the above pulleys (53) and (54) are as follows:
They are mounted at the same height and in a relative relationship perpendicular to the exposure direction. In addition, the slide members (52) and (56) are also mounted at the same height position in the normal state, and each pair of slide members (52 and 56) is mounted in a relative relationship perpendicular to the exposure direction. It is being

To explain in more detail, the support frame main body part (51) is made by bending both ends of one flat plate at right angles to form a mirror mounting part (57) and a lower end of one flat plate. A slide support part (58) is bent at a right angle to form a part for attaching the pulley, and the upper end is bent at a right angle and further bent in a letter shape to form a part for attaching the slide member. and 1
The lower end of the flat plate is bent at a right angle to form the pulley attachment part, and the upper end is bent at a right angle and then bent upward at a right angle to form the end member connection part. and a supporting part (59), and the anti-lit mounting part has a supporting part (57).
and the slide support portions (58) and (59).
) (61). Furthermore, the end member (55) has a hole (63) into which the shaft (62) attached to a predetermined position of the slide support part (59) is loosely inserted, so that the bearing (64) is not removed or dropped. A blocking bolt (65) is attached to the shaft (62). Therefore, the slide members (52056) are in contact with the upper surface of the slider (67068) attached to the copying machine main body (1), and the pulleys (53) and (54) are in contact with the slider (67068).
) (68) and is rotatably supported in a horizontal plane. Also, (69)(
Reference numeral 70) denotes a drive wire wound around the pulleys (53) and (54), and as shown in FIGS. 4 to 6, the drive wires (69) and (7
The condition of 0) is arranged so that the injury is upside down.

The optical unit drive device having the above configuration includes a support frame main body (51)
Pulleys (53) (5) rotatably attached to both ends of the
4), connect the drive wires (6) upside down with each other.
9) Since (70) is accommodated, when driving force is applied by both drive wires (69) and (70), an upward rotational force is applied to one pulley around the center of gravity. As a result, a downward rotating force is applied to the other pulley around the center of gravity, and the two rotating forces cancel each other out, causing an upward force to be applied to the support frame main body (51).
Alternatively, it is possible to reliably prevent the downward rotational force from acting.

Furthermore, since the above-mentioned pulley is rotatably mounted in the horizontal plane, the movement range of the pulley (range determined by the width and movement distance of the pulley) when viewed in the horizontal direction is reduced, making it easier to install electrical components. space utilization efficiency can be increased. Furthermore, since many electrical components are usually taller than the diameter of the pulley, there is no need to consider the increase in size caused by mounting the pulley so that it can freely rotate in a horizontal plane.

<Effects of the Invention> As described above, the present invention enables stable exposure by reducing the vertical rotation moment when applying a moving force to the support frame by housing the drive wire in the pulley. At the same time, the movable range of the pulley in the horizontal direction is reduced to a small range determined by the width of the pulley and the movable distance, so it has the unique effect of increasing the degree of freedom in attaching electrical components.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing the support frame with the reflector attached, Fig. 2 is a plan view, Fig. 3 is a side view, Fig. 4 is a schematic diagram showing the condition of the drive wire, and Fig. 5 is a schematic diagram showing the condition of the drive wire. FIG. 6 is a diagram showing the state of the drive wire for one pulley; FIG. 6 is a diagram showing the state of the drive wire for the other pulley; FIG. 7 is a schematic diagram showing the internal configuration of the copying machine.

Claims (1)

[Claims] 1. By moving the optical part back and forth, In a type of copying machine that exposes originals to light, The support frame that supports the faculty is aligned directly with the exposure direction. Rotate in the horizontal plane at both ends of the angular direction. In addition to installing a rotatable pulley, The drive wire is turned upside down with respect to both pulleys. A copy characterized by having a yen wrapped around it. Optical drive device for machines.