JPH02220077A - Stain preventing device for copying machine scanning mirror - Google Patents

Abstract

PURPOSE:To prevent scanning mirrors from stain by dust, etc., by putting reflecting planes of the scanning mirrors together when copying is not operated. CONSTITUTION:A mirror supporting member 1 is provided with a second mirror 2 and a third mirror 3 as the scanning mirrors. A second scanner 10 is composed of the mirror supporting member 1, the second mirror 2 and the third mirror 3. When the stop of the second scanner 10 is detected, the second scanner 10 starts scanning based on information from an encoder. The back planes of the second mirror and the third mirror are abutted on a guiding member 6 and the guiding member 7, respectively, and the mirrors 2 and 3 turn in the direction which closes them arround a supporting point 4 as a center against the spring energizing power.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for preventing a scanning mirror installed in a copying machine from being contaminated by dust or the like.

(Prior Art) In FIG. 9, reference numeral 20 indicates a document table of a copying machine, and a document 21 to be copied is placed on this document table 20. This original 21 is placed in a first
It is illuminated by scanner 27. 1st scanner 2
7 is equipped with a first mirror 28.

Reference numeral 30 indicates a second scanner, and the second scanner 30 is composed of a mirror holding member 31, and a second mirror 32 and a third mirror 33 fixed to the mirror holding member 31. The second mirror 32 is fixed to the mirror holding member 31 at an elevation angle of 45 degrees, and the third mirror 33 is fixed to the mirror holding member 31 at an elevation angle of 45 degrees.
It makes up the roof mirror.

In this copying machine, the first scanner 27 scans along the document surface, while the second scanner 30 moves in the same direction by half the scanning distance of the first scanner 27.

The reflected light from the original 21 due to the illumination of the illumination lamp 24 is
It is reflected by the first mirror 28, and this reflected light is reflected by the second mirror 3.
It is reflected by the second and third mirrors 33, passes through the lens group 39 arranged in the direction of reflection, is reflected by the fourth mirror 40, and further passes through the dustproof glass 41, and then passes through the photoreceptor drum, which has already been uniformly charged. 43 as imaging light, and an electrostatic latent image is formed on the photoreceptor drum 43.

The electrostatic latent image on the photoreceptor drum 43 is developed by a developing device (not shown), and the toner image is transferred onto a transfer paper and fixed thereon, after which the transfer paper is discharged outside the machine.

(Problems to be Solved by the Invention) Since the third mirror 33 of the above-mentioned conventional copying machine faces upward, dirt, dust, etc. accumulate on the reflective surface 33a of the mirror, reducing the amount of reflected light.

This decrease in the amount of light may cause stains on the background of the transfer paper.

(Means for Solving the Problems) The present invention has been made to solve the above conventional problems, and is equipped with one or more pairs of scanning mirrors that reflect light reflected from an original to be copied. In the copy machine,
Scanning of a copying machine comprising a mechanism for operating the scanning mirror so that the reflective surfaces of the scanning mirror are aligned when not performing a copying operation and in a state where the reflective surfaces of the scanning mirror are opened during a copying operation. This is a mirror dirt prevention device.

In a copying machine equipped with a pair or more of scanning mirrors fixed to a mirror holding member for reflecting light reflected from an original to be copied, a state in which the reflective surfaces of the scanning mirrors face downward when a copying operation is not performed. This is a scanning mirror dirt prevention device for a copying machine, which is equipped with a mechanism for operating a mirror holding member at the same time.

(Function) In the invention of claim 1, when a copying operation is not being performed, the scanning mirror operates and the reflecting surfaces of the scanning mirrors are brought into alignment. Further, during a copying operation, the reflecting surface of the scanning mirror is in an open state.

In the second aspect of the present invention, when a copying operation is not being performed, the mirror holding member operates so that the reflective surface of the scanning mirror faces downward.

(Example) Embodiments of the present invention will be described below based on the drawings.

The scanning mirror stain prevention device of the present invention is installed in a copying machine similar to the one shown in FIG. Regarding this, we will only explain the mechanism for operating the scanning mirror in order to prevent it from getting dirty.

1 and 2, reference numeral 1 indicates a mirror holding member, and this mirror holding member 1 has a second mirror as a scanning mirror.
A mirror 2 and a third mirror 3 are provided. The mirror holding member 1, the second mirror 2, and the third mirror 3 constitute a second scanner 10.

Both the second mirror 2 and the third mirror 3 can be opened and closed about a fulcrum 4. Both mirrors 2.3 are urged in the opening direction by springs (not shown). A mirror stopper portion 9 is formed on the mirror holding member 1. This stopper part 9 restricts the opening movement of both mirrors 2.3 by the springs, and both mirrors 2.3 are held at an elevation angle and an angle of 45 degrees, respectively.

Reference numeral 6 indicates a guide member for the second mirror, and reference numeral 7 indicates a guide member for the third mirror. These guide members 6.7 are attached to the housing 5 of the optical system of the copying machine at a position that serves as a scanning reference for the second scanner 10, that is, on the home position side (left side in the drawing).

This copying machine is equipped with an encoder (not shown), and based on information from this encoder, the second scanner 10 scans from the home position to the left side of the drawing by a distance corresponding to a predetermined number of pulses.

The operation of the scanning mirror contamination prevention device shown in FIGS. 1 and 2 will be explained with reference to the flowchart shown in FIG.

During the copying operation (Step S
2) If it is the last paper, the second scanner 10 is moved to the home position, and when it is detected that it is located at this home position (step S3), the second scanner 10 is stopped (step S, ).

When the stoppage of the second scanner 10 is detected (step S), the second scanner 10 scans to the left in the drawing based on information from an encoder (not shown) (step S). As shown in FIG. 2, the back surface of the second mirror and the back surface of the third mirror 3 are in contact with a guide member 6 and a guide member 7, respectively. The one-car mirror 2.3 rotates in the direction of closing against the force.

The second scanner 10 scans a distance corresponding to a fixed number of pulses, and both mirrors 2.3 are held by the guide member 6.7 so that the reflecting surfaces 2a and 3a are locked together. Then, such a state is detected (step St),
The second scanner 10 stops (step S).

Furthermore, if the stoppage of the second scanner 10 is detected, the copying machine is stopped (step S).

When starting the copying operation, the second scanner 10 scans to the right in the drawing, the scanning mirrors 2 and 3 are disengaged from the guide members 6 and 7, and the scanning mirror 2.3 is opened by the biasing force of a spring (not shown). It is fixed in contact with the stop bar 9.degree. 9, and is in a state where it can reflect the reflected light from the document 21.

The embodiments shown in FIGS. 3 and 4 will be described.

In the embodiment shown in the figure, the second mirror 2 is fixed to the lens holding member 1, and only the third mirror 3 can rotate about the fulcrum 4. Further, the third mirror 3 is biased in the opening direction by a spring (not shown). Furthermore, a convex portion 3b is fixedly provided on the back surface of the third mirror 3.

The housing 5 is provided with only a guide member 7 for rotating the third mirror 3.

In this embodiment, when the second scanner 11 scans a certain distance from the home position, the convex portion 3b comes into contact with the guide member 7, and as shown in FIG.
The mirror 3 is rotated, and the reflective surface 2a of the second mirror and the reflective surface 3a of the third mirror are locked in a matched state.

During the copying operation, the second scanner 11 scans to the right in the drawing, the third mirror 3 is released by the biasing force of a spring (not shown), and the edge of the third mirror 3 abuts against the stopper part 9 to remove the document from the original. The state is such that reflected light can be reflected.

The embodiment shown in FIGS. 6 and 7 will be described.

In the figure, reference numeral 51 indicates a mirror holding member. This mirror holding member 51 is fixed to a shaft 56. The mirror holding member 51 is rotated together with a shaft 56 by a motor (not shown).

The holding grooves 51a and 51b of the mirror holding member 51 have second
A mirror 52 and a third mirror 53 are each inserted, and are pressed and fixed by a leaf spring 54.5S.

Mirror holding member 51, second mirror 52. Third mirror 53
The second scanner 22 is constituted by the leaf springs 54 and 55.

This embodiment will be explained with reference to the flowchart shown in FIG.

Since the operations from step S1 to step S are similar to those in the embodiment shown in FIGS. 1 and 2, only the operation at step Ss will be described.

In step S6, the rotation motor of the second scanner 22 is activated, and the second scanner 22 is rotated 9 clockwise from the state shown in FIG.
The second mirror 5 rotates 0 degrees and is in the state shown in FIG.
The reflective surfaces 52a and 53a of the second and third mirrors 53 are directed diagonally downward.

(Effects of the Invention) As described above, according to the invention as claimed in claim 1, the reflective surfaces of the scanning mirrors are aligned when no copying operation is being performed, thereby preventing the scanning mirrors from becoming dirty with dust or the like. This can be prevented.

According to the invention set forth in claim 2, when a copying operation is not being performed, the mirror holding member operates so that the reflective surface of the scanning mirror faces downward, thereby preventing the scanning mirror from becoming dirty with dust or the like. Furthermore, since the scanning mirror is fixed to the mirror holding member, the mounting angle of the scanning mirror will not shift, and there is no possibility that the positioning accuracy between the scanning mirrors will deteriorate.

[Brief explanation of the drawing]

1 and 2 are diagrams showing a dirt prevention device for a copying ridge scanning mirror according to an embodiment of the present invention, FIGS. 3 and 4 are diagrams showing other embodiments, and FIG. FIGS. 6 and 7 are diagrams showing other embodiments, and FIG. 8 is a flowchart showing the operation of the embodiment shown in FIGS. 6 and 7. The flowchart shown in FIG. 9 is a diagram showing a conventional example. 1.51... Mirror holding member, 2, 52... Second mirror, 3, 53... Third mirror, 4... Fulcrum, 2a
, 3a, 52a, 53a...Reflecting surface, 3b---Protrusion, 6.7...Guide member, 10, 11, 22...Second scanner 56...Shaft 1〇

Claims (1)

[Claims] 1. In a copying machine equipped with one or more pairs of scanning mirrors that reflect light reflected from an original to be copied, when a copying operation is not being performed, the reflecting surfaces of the scanning mirrors are aligned with each other. 1. An apparatus for preventing stains on a scanning mirror of a copying machine, characterized in that a mechanism is provided for operating the scanning mirror in a state in which the reflecting surface of the scanning mirror is opened during a copying operation. 2. In a copying machine equipped with a pair or more of scanning mirrors fixed to a mirror holding member to reflect light reflected from an original to be copied, the reflective surface of the scanning mirrors is positioned downward when a copying operation is not being performed. 1. A scanning mirror stain prevention device for a copying machine, comprising a mechanism for operating a mirror holding member to face the mirror.