JPS6195331A - Device for driving scan exposing part - Google Patents

Abstract

PURPOSE:To suppress the deflection and oscillation of a support by attaching two pieces of guide rollers to the support and wrapping a pair of wires fixed at both ends to the prescribed position of a copying machine body around guide rollers so as to cross each other. CONSTITUTION:The wires 59, 60 fixed at both ends to the prescribed position of the copying machine body are wrapped around the guide rollers 57, 58 so as to cross each other. The prescribed position of a wire 61 as a driving power transmitting member is connected to the end of the support 53 positioned on a guide bar 51 side. The guide rollers 57, 58 have respectively two pieces each of annular grooves 57a, 57b, 58a, 58b. The one wire 59 is wrapped around the grooves 57a, 58a and the other wire 60 is wrapped around the grooves 57b, 58b. The wire 59 is fixed at one end in proximity to the exposure end side (right side in the figure) of the guide bar 51 and fixed at the other end in proximity to the exposure start side of guide rails 52. The wire 60 is fixed at one end in proximity to the exposure end side of the rails 52 and fixed at the other end in proximity to the exposure start side of the bar 51.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a scanning exposure unit driving device ro:mt. More specifically, the present invention relates to a scanning exposure unit driving device that can suppress deflection, vibration, etc.

<Prior Art> Conventionally, there has been a copying machine that exposes a document to light by moving a scanning exposure section composed of a light source, a reflecting mirror, and the like.

A copying machine with this configuration usually has a support body with a light source attached to it that is slidably supported by a guide member, and a wire for transmitting driving force is attached to a predetermined position on the back of the support body. By switching the direction of the transmitted driving force, the support body can be reciprocated, and the deflection, vibration, etc. of the support body that accompanies the forward movement can be suppressed by the engagement between the support body and the guide member. can.

However, in recent years there has been an increase in the demand for faster copying machines, forcing them to increase their copying speed and making it possible to copy large-sized originals.
It is becoming necessary to increase the initial tt12 distance of the light source.

Under such a situation, a large inertial force will act on the support when the light source or reflector stops or accelerates, and especially when reversing, the !The bending force is at its maximum, and it is easy to cause flexure, deflection, stress, etc. at the end of the support, and the above-mentioned deflection, deflection, fJJ, etc. become unavoidably large, which deteriorates the copy quality. There is an inconvenience in that it will result in significant damage.

In order to solve the above-mentioned problems, there is a structure in which two wires for transmitting driving force are used to simultaneously transmit the driving force to the two ends of the support (Japanese Unexamined Patent Publication No. 57-176070). Figure 2 in the middle, Special #1 IL Publication No. 57-52063, Japanese Patent Application Laid-Open No. 156965-1980, Japanese Patent Application Laid-Open No. 1987-1242
(Reviewed Publication No. 6, etc.), not only must the precision of the pulleys for transmitting the driving force to both ends of the support body be maintained, but also the elongation of the two wires must be considered. In reality, not only is it almost impossible to effectively suppress deflection, vibration, etc., but also deflections are forcibly generated in the struts due to variations in pulley accuracy, wire elongation, etc. It turns out.

In addition, there is also a structure in which guide rollers are attached to both ends of the support body, and a single wire for transmitting driving force is wound around the guide rollers as well (Special Wire @Sho" 57-17g6-
(Refer to Figure 3 in Publication No. RO), if deflection, vibration, etc. occur in the support, one end of the wire (mvs) becomes loose due to deflection, vibration, etc., and the other end becomes tense. As for number t', the tension on the tension side will be released in response to the loosening, and the effect of suppressing the deflection, vibration, etc. of the support will be almost the same depending on the wire itself. There is no way to simply transmit the driving force to the wire.

- The torque of the motor exerts the above-mentioned suppressing effect.
In order to increase the suppressing effect, a motor larger than necessary has to be used, and the entire copying machine is
6 J-It' 5 'F18 @ // 85°6・
? Purpose> This invention was made in view of the above problems,
Scanning tRf that does not require excessive precision, does not require an unnecessarily large motor, and can effectively suppress support deflection, photographing, etc., Part I! Provides Kinsocho! The purpose is to

In order to achieve the above object, the present invention and a scanning exposure unit driving device include a strut, a body, at least two guide rollers, a deflection unit, a body for supporting a scanning exposure unit, a deflection unit, an imaging unit, etc. It has a pair of restraining wires and a driving force transmission section, and the support body is gar! It is attached by one member so as to be able to reciprocate in the scanning direction, and is formed to be long in the direction perpendicular to the scanning direction.1. At least two guide rollers are provided facing each other in a direction perpendicular to the scanning direction. First, by connecting the driving force transmitting member 9 to a predetermined position η of the support body, the driving force is transmitted for backward movement in the scanning direction 1y, and furthermore, both ends 2 are A pair of wires are fixed in a temporary position on the machine body,
The guides 0-A above intersect with each other. By holding the wire, deflection in the scanning direction, curling, etc. can be selectively suppressed using either one of the wires.

However, as a scanning exposure section supported by the above support body,
It may be a light source that moves at a high speed, a reflector that maintains a predetermined relative agility with respect to the light source, or a reflector that moves at a speed that is approximately 1/2 that of the light source. It's a mirror, rather than a mirror.

In addition, for the above-mentioned power transmission member, for example, a wire 91 or the like can be used, and the driving force transmission member can be connected to the support body or both ends in various directions perpendicular to the examination direction. However, it is preferable to connect only the -98 part to create an n-element structure.

Also, the above guy! '9-ra and τi41. g pieces!
If so, the configuration is 17! It is preferably empty in 1 Qinhua, but it can also be 3 or more. .

<Example> .

The following is a detailed description of the invention with reference to the accompanying drawings illustrating the invention.

! FIG. 3 shows a copying machine of a type driven by an optical system, which uses a photoreceptor drum as a photoreceptor, and its mechanism. ! ! Part 5: Schematic diagram of parts, (1) shows the main body of the copying machine (
Hara located on the top surface (not shown)! At a predetermined position below, there is a light source (21) and a reflecting mirror (22N23).
H24), a lens (25), and a reflecting mirror (26). (23)
(24) in the direction of the arrow, the original (D
) can be sequentially scanned and exposed. Then, the light source (21) and the reflecting mirror (22) move into one body,
Anti-Oil $1' (23) (24) also moved into one,
The moving speed of the former is set to be twice that of the latter. Below the optical section (2), a photosensitive drum (3) rotates in the direction of arrow B for each copying operation.
1), defrost lamp (32), and charger (33)
, a developing device (34), a transfer charger (35), a separation chiller (36), and a cleaner (37).
33), an electrostatic latent image is formed by irradiating the surface of the photosensitive drum (31) uniformly charged with reflected light from the document (D), and this electrostatic latent image is transferred to the developing device (34). Toner image #a! a, transfer charger (35)
The toner image can be transferred onto the copy paper (1). Further, (41) is a registration roller that constitutes a part of the copy paper feeding section, and can feed the copy paper (P) at a speed approximately equal to the circumferential speed of the photosensitive drum (31). Further, (g) is a document holder which is attached to be movable up and down by a hinge mechanism (not shown) or the like so as to cover the upper surface of the document table (1).

FIG. 1 is a perspective view of a scanning exposure unit driving device, which is the most important part of the present invention, and shows a guide I as a guide member. (51) and the guide rail (52) are installed parallel to each other, and the light source (21) and the anti-tJ4
A support (5) supporting 1 m (22) (see Figure 3!!1)
3) The support body (53) is slidably fitted to the guide rod (51) at one end, and the slider (54) attached to the other end is supported on the guide rail (52). It is capable of reciprocating movement in a predetermined direction.

The support (53) is provided with a main reflection plate having a concavely curved light emitting body (55) made of a halogen lamp or the like.
The light emitting body (55
) light source (21) that can efficiently guide the light of
A reflecting mirror (22) is installed to guide the reflected light from the mirror to the reflecting mirror (23), and a guide roller is installed at the end close to the guide cup (51) and the nozzle rail (52), respectively. (51) and (58) can be freely rotated. Wires (59) and (60), both ends of which are fixed at predetermined positions n on the main body of the copying machine, are attached to the guide rollers (57 and 58) so that they intersect with each other. A predetermined wire (61) of the driving force transmitting member is connected to the end of the support (53) located on the guide rod (51) side. (63) is a slit, and (64) is a light amount correction plate.

Next, the guide [
■-The stakes for La (57) and (58) are about the state;
The details will be explained with reference to FIG. 2 as well.

The guide rollers (57) (5B) each have two annular R (57a) (57b) (58a) (58b).
One wire (59) is wound around the annular grooves (57a) and (58a), and the annular groove (57b)
) (58tl) and the other Y V (60) is wrapped around it. The wire r (59) has one end with a guide rod (
The guide rail (51) is fixed close to the exposure end side (right side in Figure 1), and the other end is fixed close to the exposure start side (left side in Figure 1) of the guide rail (52). can be,
One end of the wire (60) is fixed close to the exposure end side of the guide rail (52), and the other end is fixed close to the exposure start side of the guide rod (51).

Therefore, the above-mentioned Y IF (59) (60) is wound between the guide rollers (57) (58) in a cross-like manner, and the guide rail (52) side end of the support body (53) The deflection toward the end of exposure, @elementary, is effectively suppressed by the tensile force of the wire (59), and the deflection, vibration, etc. in the opposite direction is effectively suppressed by the tensile force of the wire (60). 11.

With the above configuration, the wire (
61), the support (
53), and then the support (53) can be moved toward the exposure start direction.

From now on, while performing the operation F, the support (5
3), both wires (59) and (60)
The length from the fixed position on the exposure start side to the guide 0-ra (58) will change, but both wires (59) (6G)
Since the length from the fixed position on the exposure end side to the guide roller (51) also changes to compensate for the above change m, both wires (59) and (, 6G) are tensioned and unified without slack. .

As a result, the guide roller (58) is guided and pulled (
51), the movement is suppressed by the ζ1 tension of the wire (59), and the guide roller (58) attempts to move toward the exposure end side than the guide roller (51). Also, the above movement is suppressed by the tensile force of Y 1F (6G). That is, both wires (59
) (60), the guide roller (51) (
The relative position of 58) can be maintained in the set state, and as a result, the deflection, vibration, etc. of the support body (53) can be effectively suppressed. .

Note that the present invention is not limited to the above-mentioned embodiment, and each guide 0-ra (!M) (58) is composed of two rotatable coaxial guide rollers. By forming annular vortices in each of the wires (
59) (,,6G) and guide rollers (57) and (58) fl! In addition to being able to reduce the frictional resistance, it is also possible to make various design changes within the scope of the invention.

Effects> As described above, the present invention has a pair of lieers 1° with at least two guides 07 attached to the support and both ends fixed at predetermined positions on the copying body, so that they can be arranged in a cross-shape with each other. Since the guide roller is wound around the guide roller, even if inertial force is applied to the support due to repeated reciprocation and movement during acceleration and stopping, the support will not deflect or I! ! It has the unique effect of being able to effectively suppress IJ, etc., and obtaining high-quality copies even if the copying operation speed is increased or the reciprocating distance of the light source is increased.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the scanning exposure section 11A@@ position, and the second section is a diagram showing the wire (59) (6G) in the spring-hanging state.
Fig. 3 is a schematic diagram showing the main parts of a copying machine. (21,)--light source, (,,,22,,) (23,
)(,24)--Reflector, (25)--Lens,
・(31)-... 'sensor/light drum as a photoreceptor, (5
1)...Guide rod as a guide member, -(52)・
・・Guide rail as a guide member, (53′)−・
・Support body, (57) (58)--Guide roller, (5
9) (60)... wire, (61)... wire as a driving force transmission member.

Claims (1)

[Claims] 1. Illuminate the original with a light source and remove the light from the original. Sensitize the reflected light through a reflecting mirror, lens, etc. Light sources and reflections that lead to the body. By moving the mirror back and forth, the entire surface of the original can be covered. In an optical system that exposes The support body that supports It is mounted so that it can be moved back and forth in both directions. The predetermined position of the holding body is approximately perpendicular to the direction of movement. At least 2 guys facing each other A drawer is installed and the above support The driving force transmission member is attached to the specified position on the body. and attach both ends to the copier body. A pair of wires fixed in place is The guide rollers are wound around each other in a crosswise manner. Scanning exposure characterized by vignetting Part drive device.