JPH0259991B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an electronic copying machine, and particularly to an electronic copying machine, in which a slider carrying an optical member is placed on two parallel rails, and the slider is driven at a predetermined speed. The present invention relates to an electronic copying machine that scans and exposes an image of a document.

BACKGROUND ART In general, a scanning optical system in an electronic copying machine includes a first optical system including a light source lamp and a first mirror, and a second optical system including second and third mirrors, which are attached to each slider. is scanned and moved at a speed ratio of 2:1 on two parallel rails to expose an image onto the image receptor.

By the way, in order to increase the stability of the optical system when it is driven, it is necessary to obtain as large a support area as possible. For the same support span (maximum length in the scanning direction), four-point support is more advantageous than three-point support in increasing the support area. That is, as shown in Figs. 1 and 2, if the support span A is the same, the support area indicated by diagonal lines is 4-point support (first
Figure) is larger than the three-point support (Figure 2),
The stability region also creates a difference between l and l'. If we try to obtain the same stability area l with 3-point support as with 4-point support in Figure 1, the support span A' will become considerably longer as shown in Figure 3, and the slider itself will become larger, resulting in less space efficiency. bad.

In FIGS. 1, 2, and 3, 1 is a slider, 2 is a support member, 3 is a rail, and G is the center of gravity of the slider 1. Furthermore, the dynamic acting force F _G is a combination of the inertial force F _a and the gravity F _b .

Therefore, although four-point supports are widely used in conventional scanning optical systems, it is extremely difficult to position the four-point supports on one plane by improving the precision of component processing. . For this reason, in a conventional scanning optical system configured with a rigid frame, at least one support part is provided so that the height can be adjusted.

However, with this conventional type, height adjustment is complicated, and because it uses a rigid frame, it is heavy and requires a drive source with large torque, making it expensive in terms of parts costs, adjustment costs, etc. It has its drawbacks.

Purpose of the Invention The present invention has been made in view of the above points, and it is an object of the present invention to adopt a four-point support system to ensure driving stability of an optical system, and to eliminate the need for adjustment, reduce weight, and reduce costs. The purpose is to provide an electronic copying machine that can.

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides an image of a document by placing a slider carrying an optical member on two parallel rails and driving the slider at a predetermined speed. In an electronic copying machine that performs scanning exposure, the slider includes two side plates that loosely hold an optical member, a plate-like member that is provided integrally with these side plates and connects the side plates and is elastically deformable, and both side plates. The slider is provided with means for driving the slider by transmitting a driving force to both sides of the slider. It is characterized by

Embodiment FIG. 4 schematically shows an embodiment of an electronic copying machine according to the present invention. A photosensitive drum 21 that can be rotated counterclockwise is disposed approximately in the center of the copying machine main body 20, and a main eraser lamp 2 is arranged around the photosensitive drum 21.
2. Sub charging charger 23, sub eraser lamp 24, main charging charger 25, developing device 2
6, a transfer charger 27, a separation charger 28 for a copying machine, and a blade type cleaning device 29 are provided. The photosensitive drum 21 is sensitized by passing through eraser lamps 22 and 24 and chargers 23 and 25, and receives image exposure from an optical system 40.

The optical system 40 is placed under the original glass 39 so that the original image can be scanned. 2 optical system 50
, a transmission type projection lens 58 , and a fixed mirror 59 . Note that the first optical system 41 moves to the left at a speed of (v/n: magnification, n: copy magnification) with respect to the circumferential speed v of the photosensitive drum 21 (constant regardless of whether the magnification is the same or variable magnification). However, the second optical system 50 moves to the left at a speed of (v/2n).

On the other hand, paper feed cassettes 30 and 31 that can automatically feed paper are installed on the left side of the copying machine main body 20, and the conveyance path of the copying machine includes roller pairs 32, 33, 34, a guide plate 35, a conveyance belt 36, and a fixing device. 37, and a pair of discharge rollers 38.

FIG. 5 shows a scanning optical system drive mechanism, in which first wires 70a, 71a and second wires 70b, 71b wound around a common pulley 60 extend on both sides of the scanning path, and the first optical system 41, The second optical system 50 is driven to scan and return.

The common pulley 60 is installed at the widthwise center of the scanning path at the end of the scanning path in the scanning direction B, and is connected directly to the motor capable of forward and reverse rotation, or indirectly connected to the motor via a clutch capable of switching between forward and reverse rotation. It can be rotated in either forward or reverse directions.

First wires 70a, 71a, second wire 70
b, 71b are functionally scan wires 70a,
70b and return wires 71a and 71b. The scan wires 70a and 70b are fixed at one end to the common pulley 60, wound counterclockwise a few times, and stretched around fixed pulleys 61a and 61b rotatably provided on the frame 10, and then connected to both sides of the scanning path. Fixed pieces 44a, 44 on both sides of the slider 80 (described in detail later) of the first optical system 41 extend.
b, and is stretched over pulleys 54a, 54b rotatably provided on both sides of the slider 90 (described in detail later) of the second optical system 50, and the other end is attached to the frames 12a, 12b. It is fixedly attached to 15a and 15b. Further, the return wires 71a and 71b connect one end to the common pulley 6.
0, each is wound clockwise a necessary number of times, and is stretched around fixed pulleys 62a and 62b rotatably provided on the frame 10, and then extended to both sides of the scanning path and rotatably attached to the frames 11a and 11b. Idle pulleys 64a, 64b are stretched on fixed pulleys 63a, 63b provided on the frame 11a, 11b and are folded back, and further stretched on the movable pulleys 54a, 54b and folded back, and rotatably provided on the frames 11a, 11b.
The tension spring 7 extends inwardly through the tension spring 7.
It is fixed to both ends of 2.

On the other hand, the sliders 80 and 90 are attached to the frame 12.
a, 12b, and as shown in FIGS. 6 and 7, the slide member has a smooth surface on which rail portions 13a, 13b, which are formed by bending the upper portions of the frames 12a, 12b inward, are attached. 14a,1
Support members 45a, 45b, 55a, and 55b provided on both lower surfaces of the sliders 80 and 90 are opposed to each other on the slider 4b. That is, the sliders 80 and 90 are supported by the support members 45a, 45b, 55a, and 55b, and the slider member 1 is mounted on the rail portions 13a and 13b.
It is slidably mounted via 4a and 14b. The slide members 14a, 14b are made of stainless steel or the like, and the support members 45a, 45b, 55a,
55b are made of Teflon-based resin or the like having a small coefficient of friction, and two of them are installed in the scanning direction.

In the above configuration, in order to cause the first optical system 41 and the second optical system 50 to scan, the common pulley 60 is rotated in the counterclockwise direction. That is, the common pulley 6
0 rotates clockwise, the scan wires 70a, 70b are wound around the common pulley 60, and each pulley 61a, 61b, 54a, 54b
is driven to rotate, and the first optical system 41 and the second optical system
The optical system 50 scans in the direction of arrow B at a speed ratio of 2:1. At the same time, return wire 71
a and 71b are pulled out from the common pulley 60 by the spring force of the tension spring 72.

The return of the first optical system 41 and the second optical system 50 is performed by driving the common pulley 60 reversely in the counterclockwise direction. That is, as the common pulley 60 rotates counterclockwise, the return wires 71a and 71b are connected to the tension spring 7.
It is wound around the common pulley 60 against the spring force of 2, and each pulley 62a, 62b, 63a, 63
b, 54a, 54b, 64a, and 64b are driven to rotate, and the first optical system 41 and second optical system 50 are returned in the direction opposite to the arrow B. At the same time, scan wires 70a and 70b are pulled out from common pulley 60.

Here, the optical systems 41 and 50 and their sliders 8
0 and 90 will be explained with reference to FIGS. 8 to 11.

The first optical system 41 includes a slider 80 and a first mirror 4
2, a light source lamp 46 equipped with a reflective shade 47, and a book mirror 48, and a second optical system 50 includes a slider 90, a second mirror 51, and a third mirror 52. Each slider 80, 90 is made of a thin plate processed by sheet metal, and is attached to the bent side plates 81, 81, 91, 91, connecting plates 82, 92, and the outside of the side plates 81, 91, as shown in FIGS. 8a and 8b.
It consists of horizontal plates 83, 83, 93, and 93. When the original is thick such as a book, the book mirror 48 directs illumination light to the original glass 3 from behind in the scanning direction.
A slit 49 is formed to guide the reflected light from the document surface to the first mirror 42 to prevent the occurrence of shadows.

FIG. 9 schematically shows the sliders 80, 90, and the side plates 101, 101 are the mirrors 42,
It has a function of holding members such as 51, 52 and the reflective shade 47. The positioning of these members is done using the side plate 10.
The vertical positioning is performed by the mounting holes and notches formed in the support member 101.
Horizontal plates 103, 103 with 4a, 104b attached
With reference to the mounting surface Y of the side plates 101 and the end surfaces X of the side plates 101 and 101, horizontal positioning is performed to a predetermined accuracy during component processing.
Further, as shown in FIG. 10, the function of the connecting plate 102 is to support the side plate 101 so that it does not fall down, and it does not have the function of preventing the side plates 101, 101 from twisting, but is elastically deformable. That is, the connecting plate 102 has a flexible structure such that the side plates 101, 101 are twisted, so that the four supporting members 104a, 104b are always connected to the rail portion 13.
It comes into contact with the tops a and 13b.

Note that the connecting plate 102 has no rigidity against rotational moment on a horizontal plane, and the side plates 101, 101 easily shift as shown in FIG.
However, in practice, if a double-sided drive method is adopted as in this embodiment, horizontal deviation can be prevented by eliminating variations in tension etc. by adjusting the wire end or the wire attachment position of the slider. Such deviations do not occur during operation.

Furthermore, in order to ensure a flexible structure against twisting of the side plates 101, 101, it is necessary that the mounting structure of the mirrors 42, 51, 52, the book mirror 48, and the reflective shade 47, which have torsional rigidity, also be flexible structures.
For example, in the case of the reflective shade 47, as shown in FIG.
01 hole 108 loosely. That is, a slight clearance is provided between the pin 85 and the hole 108. Alternatively, as shown in FIG.
a, and a pin 87 fixing the side plate 101 to this counterbore portion 47a may be inserted and engaged, and the head of the pin 87 is spherical. As shown in FIG. 14, the mirror surface of the mirror 51 is brought into contact with the protrusion 96 of the opening 95 formed in the side plate 101, and the back surface corresponding to the protrusion 96 is brought into contact with the protrusion of the spring plate 97. Press with piece 98. In this case, it is preferable to support the mirror 51 at three points so as not to cause mounting distortion.

Effects of the Invention As is clear from the above description, according to the present invention, a slider carrying an optical member is provided with two side plates that loosely hold the optical member, and two side plates that are integrally provided with these side plates. The four-point support system is advantageous because it is composed of plate-like members that are connected and can be elastically deformed, and support members that movably support the sliders, two of which are provided on both sides in the scanning direction, on the rails. Not only can drive stability be ensured, but the elastic deformation of the plate-like member can absorb rattling due to errors in component dimensions, eliminating the need for adjustment, and making it possible to reduce the weight of the slider.
By eliminating such adjustments and reducing the weight, it is possible to reduce the cost of the electronic copying machine. Moreover, since the slider is driven by transmitting driving force to both sides of the slider, there is no possibility that the slider will slip off the rail.

[Brief explanation of drawings]

1 to 3 are explanatory diagrams of a slider support system, FIG. 4 is a schematic configuration diagram showing an embodiment of an electronic copying machine according to the present invention, and FIG. 5 is a perspective view showing its optical system drive mechanism. , FIG. 6 is a plan view showing a part of the optical system drive mechanism, FIG. 7 is a front view of FIG. 6, FIGS. 8 a and b are perspective views of the optical system, and FIGS. 9 to 11 are respectively Explanatory diagram of the slider, Figures 12 and 13
The figure is a sectional view showing the member mounting structure, and FIG. 14 is a perspective view showing the member mounting structure. 13a, 13b...Rail portion, 41...First optical system, 50...Second optical system, 42, 51, 52...Mirror, 46...Light source lamp, 45a, 45b, 55
a, 55b...support member, 80, 90...slider,
81, 91... Side plate, 82, 92... Connection plate.

Claims (1)

[Claims] 1. In an electronic copying machine in which a slider carrying an optical member is placed on two parallel rails, and an image of a document is scanned and exposed by driving the slider at a predetermined speed. , the slider has two side plates that loosely hold the optical member, a plate-like member that is provided integrally with these both side plates and connects the both side plates and is elastically deformable, and two pieces on each side plate in the scanning direction. an electronic copying member comprising: a support member provided to movably support a slider on a rail; and means for driving the slider by transmitting a driving force to both sides of the slider. Machine.