JPS63249835A - Copying device - Google Patents

Abstract

PURPOSE:To prevent a vibration generated from a driving system in the course of copying, so that satisfactory copying accuracy can be obtained, by dividing a driving system supporting part for supporting the driving system, and an optical system supporting part for supporting an optical system in order to form a latent image, and interposing a vibration-proof material between both these supporting parts. CONSTITUTION:In a bracket 13, a projecting part 13a is formed, and on the other hand, on a horizontal plate 15, a roughly chevron-shaped fitting bracket 15a is provided, and between an inclined face 13b of this projecting part 13a and an inclined face 15b of the fitting bracket 15a, a vibration-proof material 14 is interposed. Accordingly, the vibration in the vertical direction and the horizontal direction can be effectively absorbed. As for this vibration-proof material 14, for instance, butyl rubber, a high viscous fluid, etc., can be used. In this state, both side plates 11, 12 being a driving system supporting part, and a horizontal plate 4 being an optical system supporting part are connected through the vibration-proof material 14. In such a way, it does not occur that an optical system of an image forming lens 16, etc., is vibrated due to a vibration of a driving system, and copying is executed with satisfactory copying accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for copying an original using an optical system and a drive system, and particularly to a copying apparatus that prevents deterioration of copy accuracy due to vibration of the drive system.

Prior Art Conventional devices of this type include, for example, those shown in FIGS. 7 to 1.
There is something like the one shown in Figure 1. This copying device has a substrate 1
A right side plate 2 and a left side plate 3 are erected facing each other.

A horizontal plate 4 is installed at a predetermined height between the side plates 2 and 3, and an optical system such as an imaging lens 5 (details are omitted) is mounted on this horizontal plate 4. Further, a drive system such as a main motor 6 (details are omitted) is fixed to the right side plate 3.

However, such conventional devices have the following problems.

That is, since the optical system including the imaging lens 5 and the drive system including the main motor 6 are supported by the rigidly connected side plates 2 and 3, the horizontal plate 4, etc., the main motor 6 etc. may not vibrate during copying. This vibration is then transmitted to the optical system such as the imaging lens 5. Due to this influence, for example, if the imaging lens 5 vibrates by a width Q as shown in FIG. 8, the image of the document surface 7 will be shifted by 2Q on the imaging surface 8 at the same magnification. In the case of slit exposure, this vibration occurs while the pattern 9 is irradiated onto the photoreceptor by the width of the slit, as shown in FIG.
The latent image pattern has a width equal to the original latent image width plus 2Q due to the vibration. To give an example, as shown in FIG. 10, the potential pattern 10 is expected to be in the shape of Mt. Fuji, and if the developing bias level is VB, the line width reproduced on the copy paper is 1 width LD, which is thicker than the 1M draft line. It may happen. Therefore, by increasing the bias VB, the appearance becomes higher and
Although the width LD becomes thinner, inconveniences such as thin lines being interrupted occur accordingly.

In addition, in the halftone dot image, there is deterioration on the side where the halftone dot area is small and on the side where the halftone dot area is large. become. If the vibration is large, the curvature of the γ curve becomes large, and the expressibility of the copied image deteriorates.

Although this is an example of simple harmonic motion, in reality mirrors, contact glass, etc. also vibrate, resulting in a complex vibration state. The level of the vibration width Q is about 10 μm to 50 μm, and this varies depending on the device.

This invention was made by focusing on this problem.
It is an object of the present invention to provide a copying apparatus with good copying accuracy without transmitting vibrations of a drive system to an optical system.

In order to achieve the above object, the present invention provides an optical system support section that supports an optical system that irradiates light onto a document and reads an image of the document using reflected light, and a drive system such as a motor that drives the document during copying. The copying apparatus is characterized in that the optical system support part and the drive system support part that support the optical system support part are separated, and a vibration isolating material is interposed between the optical system support part and the drive system support part.

Hereinafter, this invention will be explained based on examples.

1 to 5 are diagrams showing a first embodiment of the present invention.

First, to explain the configuration, cylinder number 11 in Figure 1 is the right side plate, 1
Reference numeral 2 denotes a left side plate, and these side plates 11 and 12 are erected facing each other from the base plate as in the conventional case. and.

Brackets 13 are screwed and fixed to the side plates 11 and 12 at predetermined heights, respectively, facing inward. A horizontal plate 15 is supported by these brackets 13 via a vibration isolator 14.

Specifically, the bracket 13 is formed with a convex portion 13a, and the horizontal plate 15 is provided with a mounting bracket 15a having a substantially doglegged shape. And this convex portion 13a
and the inclined surface 15b of the mounting bracket 15a.
A vibration isolating material 14 is interposed between the two.

When the vibration isolating material 14 is disposed between the inclined surfaces 13b and 15b in this manner, vertical and horizontal vibrations can be effectively absorbed. As the vibration damping material 14, for example, butyl rubber, a polymeric material such as Hanenite (trade name), a high viscosity fluid, or the like can be used. In addition, in the case of a polymer material, a material with high hardness is suitable.

The both side plates 11 and 12 as drive system support parts and the horizontal plate 4 as an optical system support part are now connected via the vibration isolating material 14. Although not shown, a drive system such as a main motor is disposed on the side plates 11 and 12, and
The horizontal plate 4 is provided with the following optical system.

Specifically, as shown in FIG. 2, an imaging lens 16 is disposed approximately in the center of this horizontal plate 15, and a pair of support members 17 are provided at both ends of this horizontal plate 15 to support the imaging lens. They are erected facing each other with 16 in between. A scanning rail 18 and a scanning guide bar 19 are installed between the surface support members 17 . A cushion member (not shown) is interposed between the scanning rail 18 and the scanning guide bar 19 and the surface support member 17. An exposure lamp 20, a first mirror 21, a second mirror 22, and a third mirror 23 are slidably mounted on the scanning rail 18 and the scanning guide bar 19. The exposure lamp 20 and each mirror 21, 22, 23 are connected to various pulleys 24... and wires 2.
5, and is slid by a scanner motor 26. By the way, the imaging lens 16 and the fourth
The mirror 27 is of a fixed type.

Further, the upper end portion of this support member 17 is bent horizontally to form a placing portion 17a.
A contact glass 28 is supported at a.

Incidentally, in FIG. 3, cylinder number 29 is a dustproof glass, and 30 is a photoreceptor.

Next, the operation of the copying apparatus having such a configuration will be explained.

When the device is operated to make copies, when the drive system such as the main motor or power transmission device (not shown) is driven, these drive systems are supported by the side plates 11, 12, etc. Both side plates 11, 12 vibrate. Conventionally,
This vibration was transmitted to the optical system such as the imaging lens 16, but according to the present invention, such a situation is prevented.

That is, since the vibration isolating material 14 is interposed between the horizontal plate 15 and the vibrating side plates 11 and 12 as described above, the vibration of the side plates 11 and 12 is absorbed by the vibration isolating material 14. Vibration transmission to the horizontal plate 15 side is suppressed. In this case,
Since the contact glass 28 is also supported on the horizontal plate 15, vibration transmission to the contact glass 28 is also suppressed.

Moreover, in this embodiment, the exposure lamp 20 and each mirror are
21, 22, 23, etc. slide on the scanning rail 18 and the scanning guide bar 19 during scanning, but vibrations generated by collisions when the scanning direction changes from the forward path to the backward path during reciprocating scanning are caused by the vibrations that occur on the scanning rail 18 and the scanning guide bar 19. Since the cushion member is disposed between the guide bar 19 and the support member 17, vibrations are absorbed by this member.

As a result, the vibration of the drive system causes the imaging lens 16 to
The optical systems such as the above do not vibrate, and copies are made with good copying accuracy.

Incidentally, a lens drive motor (lens motor) for variable magnification may be attached to the imaging lens 16, but since this motor is not driven during the image forming process, the vibrations of this motor are It does not have any negative effects during image creation,
Therefore, even if this motor is disposed on the horizontal plate 15, it will not be supported.

Further, FIGS. 5 and 6 show a second embodiment of the present invention.

The copying device of this embodiment is a so-called alligator type,
It is divided into upper and lower units 32 and 33, and one end 34 side is rotatably connected. FIG. 5 shows the device in its open state.

In this connection structure, as shown in FIG. 6, a rotating shaft 33b is provided protrudingly from the side plate 32a of the lower unit 33, while a coupling fitting 33 is provided on the side plate 32a of the upper unit 32 via a vibration isolator 35.
2b is fixed, and the rotation shaft 33 is attached to this coupling fitting 32b.
b are rotatably connected. A spring 36 is attached to this rotation shaft 33b, one end 36a of this spring 36 is attached to a locking piece 33c of the lower unit side plate 33a, and the other end 36b of this spring 36 is attached to the upper unit side plate 32a. Both units 32 and 33 are respectively locked by locking pins 32c, and are biased in the opening direction by this spring 36.

Further, as shown in FIG. 5, a mounting plate 32d is fixed to the tip of the upper unit 32 via a vibration isolating material 37, and a hook member 38 is fixed to the mounting plate 32d.
The proximal end portion 38a of is rotatably attached. on the other hand,
A locking member 39 on which a hook-shaped hook portion 38b of the hook member 38 is hooked is fixed to the lower unit side plate 33a via a vibration isolating material 40. In this way, in the area where both units 32 and 33 are connected, the vibration isolating material 3
5.37.40 will intervene.

The lower unit 32 is provided with a main motor 42 and a transmission gear box 43 as a drive system. Further, reference numeral 44 is a fixing unit, 45 is a transfer charger, 46 is a developing unit, and 47 is a copy paper conveying section. This lower unit 32 is a drive system support section that supports the drive system.

On the other hand, the upper unit 32 includes a photoreceptor belt 49, a cleaning unit 50, a rinser 51, an exposure lamp 52,
- A second charger 53 is arranged, and a filter 5
4, a cooling fan 55, a contact glass 56, etc. are provided. This upper unit 32 is an optical system support section that supports the optical system.

In this way, the drive system such as the main motor 42 and the transmission gear box 43 is disposed on the lower unit 32 side, and the optical system such as the rinse 51 for forming a latent image is disposed on the upper unit 32 side. Vibration isolating material 35 between both units 32 and 33
．． By interposing 37.40, the main motor 4
Even if the lower unit 32 side vibrates due to the drive of the second unit, this vibration is absorbed by the vibration isolating material 35, 37, 40, and the vibration transmission to the upper unit 32 is suppressed. As a result, the optical system is less affected by vibrations of the drive system, and a highly accurate latent image can be formed.

It goes without saying that the present invention can also be applied to facsimile machines, printers, and the like.

Effects As explained above, according to the present invention, the drive system support section that supports the drive system and the optical system support section that supports the optical system for forming a latent image are separated, and both of these support sections are separated. By interposing a vibration isolating material between them, the vibrations generated from the drive system during copying can be absorbed by the vibration damping material, and vibration transmission to the optical system can be suppressed, resulting in good copying accuracy. It exhibits a practically beneficial effect that can be obtained.

[Brief explanation of drawings]

1 to 4 are diagrams showing a first embodiment of the copying apparatus of the present invention, in which FIG. 1 is a sectional view showing the main parts of the apparatus, and FIG.
The figure is an exploded perspective view showing the main parts of the device, Figure 3 is a schematic sectional view showing the optical system of the device, Figure 4 is a schematic perspective view showing the optical system, and Figures 5 and 6 are FIG. 5 is a sectional view showing the outline of the entire copying device, FIG. 6 is a perspective view showing the connecting portion of the same device, and FIGS. 7 to 11 are conventional examples. FIG. 7 is a perspective view showing the side plates, horizontal plate, etc., FIG. 8 is an explanatory view showing the imaging state of the M document image by the imaging lens, FIG. 9 is a view showing the pattern, and FIG. FIG. 10 is a graph showing a potential pattern, and FIG. 11 is a graph showing a comparison of γ curves depending on the magnitude of vibration. 11, 12...Side plate (drive system support part) 14, 35.3
7.40... Vibration isolation material 15... Horizontal plate (optical system support part) 32... Upper unit (optical system support part) 33... Lower unit (drive system support part) Fig. 1ff1 I4 A Figure 5 Figure 6 Figure 7 D

Claims (1)

[Claims] An optical system support section that supports an optical system that irradiates a document with light and reads an image of the document using reflected light; and a drive system support section that supports a drive system such as a motor that is driven during copying; A copying apparatus characterized in that a vibration isolating material is interposed between the optical system support section and the drive system support section.