JPS5944038A - Electrophotographic copying device - Google Patents

Abstract

PURPOSE:To realize such a penetration type that an original is irradiated with light from above, by driving and moving the 1st movable reflecting mirror and the 1st light source synchronously at the same speed. CONSTITUTION:The 2nd movable mirrors 6 and 7 are coupled together mechanically to move in the same direction with a movable mirror 5 at a speed a half the moving speed of the movable mirror 5, so the distance from the original 4 to a lens 11 is adjusted to double as long as the focal distance of the lens 11 during the movement of the 1st movable mirror 5 from the left end to the right end of the original 4. Therefore, the unmagnification light image of the picture on the original 4 in mirror image relation is projected on the surface of a photosensitive drum 2. A motor driving a scanning pulley 19 to move the 1st movable mirror 5 and the 1st light source 14 in corresponding relation and a driving motor 34 for moving the 1st light source 14 are driven synchronously and the 1st movable mirror and the 1st light source move at the same speed, so the light from the light source never passes through the original by irradiation and reflection and passes through it only by irradiation, so light attenuation is less.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electrophotographic copying apparatus, and more specifically, to an electrostatic transfer type copying apparatus capable of copying, for example, X-ray photographic film or thick special film by transmitting light. This relates to an electrophotographic copying machine such as a machine.

Conventional configuration and problems An electrophotographic copying apparatus uses an electrophotographic photoreceptor having a photoconductive layer on its outer periphery, and when a document image is projected after uniformly charging the surface of this photoreceptor, it causes a grin. Ig:, (A
':+ K Al response L It static '+1+', '/'h
f4i full formation. (7) This electrostatic latent image is converted into a tree image using a developer, and the photoreceptor surface [((l
The 1-ri-1 image formed on the paper is transferred to the surface of copy paper to obtain a copy.

Normally, in this 11 [1 rν′ 勺′′ device], the one-color light body is made into a cylindrical shape, and the light body is pivoted so that it can be rotated almost at the medium heat part of the device i4i. ° Eru Obi '1E device,
An optical device that projects the reflected light from the original onto the surface of the light body at 1.
゛: A developing device that develops an electrostatic latent image corresponding to the image, a developer □
□□Transfer device that transfers the 1-toner image developed by the device onto both sheets of paper: 17th generation A cleaning unit that removes the 1-toner image remaining on the surface of the light body after the toner image has been transferred. fJ the equipment, etc. The structure is such that they are sequentially arranged around one cylindrical light beam, that is, one cylindrical light beam.

In addition, there is a copy paper feeding device that feeds the copy paper sheet by sheet into the above-mentioned machine, a copy paper supply device, and a copy paper sheet 1 that has been transferred.
Fixing device i' for fixing the 1st image of -'r'l
l' is set in the vicinity of 1, bright light 1, and ul.

Unfortunately, when using a cylindrical photoreceptor as an optical device that projects light onto the surface of the photoreceptor, it is not possible to project the entire contents of the original onto the photoreceptor at once. Therefore, an optical scanning device is required to scan a dihedral document in a slant-like manner. Therefore, in order to perform a copying operation, the photosensitive drum, the means for feeding paper from the paper feeder to the transfer device [1], the means for feeding paper from the transfer device to the fixing device, or the drive of the fixing device must always rotate in the same direction. On the other hand, the optical scanning device described in [) II can safely perform reciprocating operations to scan the document.

Conventionally, in this type of copying machine with a fixed document stand, the reflected light from the document is transmitted through mirrors and lenses.

Since the light is projected onto the photoreceptor drum via a mirror, the projection distance becomes longer, and the light quality is reduced accordingly. To overcome this, the light source generally has a range of 170W to 200W (a halogen lamp is used).In addition, a movable document table is used for
1. Since the light is directly projected onto the photoreceptor 1-" ram through the optical stock lens, the projection distance is short;
Less light damage is required. q;r-, and the light source in this case has -Illustrative uses 1i1*f1. The surrounding area is 120W~
I need a 180W halogen lamp.

11; (The manuscript was written as light source 11.lL7', and I'iC+1.'41
:The part outside of i is I! j! ： fl:5 Pressing Sale Raha causes 尤 to be JyQ q, l', so there is no problem with copy occupation 1<l:, but there is an X-ray photograph file), a mixed hand ♂ 11 shi fil j, etc. In this case, the transparency is low even in the white area, and the light attenuation is large at 1[1, t11.1+, and the appearance of reproduction is poor in the general usage range of 9ll; It's hard to tell whether it's pitch black or not.
I was disappointed in the fact that I could only get one image.

In order to overcome this drawback, copying is possible by increasing the exposure level of the light source to the maximum likelihood, but the heat generated by the light source is also high, causing cracks in the glass and burning of the document holding rubber. 1. Purpose of the Invention The present invention is based on a see-through type 1'1I which irradiates light from the
It is an object of the present invention to provide a multi-layer photocopying apparatus which can eliminate the two drawbacks of conventional copying apparatuses as described above by adopting an lf structure.

Structure of the Invention The present investigation is based on a photosensitive drum and a transparent original.1. lt unit and 1
) 1 [Between the ram to the photoreceptor 1 and the transparent document stand,
1st motion) y, fA, 1 mirror, the moving speed of the first movable mirror 1,! a main body device having an optical device including a second movable mirror, a lens, and a mirror that moves at a speed ratio of Ingredients (1#i L, and above).

In the Latin cover device, 1) a first light source is provided at a position corresponding to the first movable mirror 1 of the main body device, and a driving means for the first light source and a transparent document holder of the main body device are provided with +
[A transparent part is provided at the position where the first movable part 1 is moved.
11. It has a structure in which the mirror and the first light source are synchronously driven and moved at the same speed.

Description of examples The present invention will now be explained based on illustrated embodiments.

In FIG. 1, a cylindrical electrophotographic photosensitive member 2, which has an electrophotographic photoreceptor layer, is rotatably supported on the main body 1 of the copying apparatus. Although not shown in the periphery of the film body 1 and the film 2, there are well-known banding devices, exposure slits, and developing devices.
A transfer belt 'lli, a charger for removing electricity from the second paper, an Ichikawa charger for removing the photoreceptor, and a cleaner are arranged in this order.

Copy paper supply that further sends copy paper to the transfer device>B,)
and a fixing device that fixes the 1--no-paintings of the double paper that is played from drum 2: za 1.
I have 1lifi of ゛.

3 is a crow'; 9 is a transparent 1ii4: a document holder; plastic, tempered glass, etc. can also be used. 4 is the manuscript.

Next, the optical curve nfl geometry 111) will be explained.

The first 111 movement 1 moves from the page 71i of the document 4 to the right edge of the document 4 and the surface of the document 4.

The movable mirror 6 is inclined to the original 4 at an angle of 1.4 g, and if the original 4 is violated, the movable mirror 6 changes its direction at right angles to the mirror indicated by 6.

Mirrors 6 and 7 are movable mirrors held by body weight, tilted at an angle 4i above the document 4, and facing each other at an angle of 96°.

Therefore, the inverse U and I lights of the original 4 that have been deflected by the 1iJ moving mirror 5 are deflected by the mirrors 6 and 7 and directed toward the lens 11.

The second movable mirrors 6 and 7 are mechanically coupled so that they move in the same direction as the moving direction of the movable mirror 5 at a speed ratio of % to the moving speed of the movable mirror 5. Therefore, the first movable mirror 5
The distance from the original 4 to the lens 11 is kept constant while the lens 11 is moving from the left end of the original 4 to the right end. This distance is adjusted to be twice the focal length of the lens 11.

The above is the optical scanning mechanism in the embodiment of the present invention,
1st. When the scanning of the document 4 from left to right by the second movable mirror 5, 6.7 is completed, it returns to the opposite direction and returns to the state before the start of scanning.

Note that the light passing through the lens 11 is reflected by fixed mirrors 8, 9, .
10 and passes through the exposure slit to the photoreceptor drum 2.
projected onto the surface of Lenses 11 to 16 Light drum 2
The distance to the lens 11 is set to twice the focal length of the lens 11. Therefore, on the surface of the photosensitive drum 2, an optical image is projected that is the same size as the image of the original 4 and has an image relationship of ↑l:χ.

- The movement speed of the first movable mirror 50 in the right direction is set by a motor so that it is equal to the circumferential speed of the one-color light bodies 1-L, 2.
, IA is moved. The second movable mirrors 6 and 7 are also driven by the motor at a speed of 1% of the 1.delta. 51X medium power is applied.

The main unit 1 consists of a tonneau, 1.l:l, li.
The transparent JH' of this main unit 1 is attached to the platen cup that covers the i4 high fief table 3;
1y, 1 digit, 11" facing the transparent original platen 3
l: N'i is provided with a similar transparent part 4; 413;
';' (I+rl Hold down 4 and fix it.

Furthermore, a first light source 14 such as a halogen lamp is provided at a position corresponding to the 1111th moving reflecting mirror 6 of the main body device 1, and the first moving reflecting mirror 5, u
-11i1 period jl, 'IA moves 7 and is configured to move in the same series.

Next, a mechanism for moving the first movable mirror 5 and the second movable mirrors 6 and 7 will be explained. As shown in Figure 2, optical
The wire 16, one end of which is fixed to the unit of the tension mechanism at position 16, is folded back by the first movable pulley 17 provided at one end of the movable support of the second movable mirror 6°7, and
- It is folded back again at the first fixed pulley 18 provided on the main body. This wire 16 is wound around the scanning pulley 19 several times, then turned back around the second identification pulley 20, and is attached to the support of the second 1f moving mirror 6, 7 coaxially with the first movable pulley 17. It is folded back by the second movable pulley 21 and fixed at the position 22 between the unit 1 and the main body [f, 1].

The support body of the 11th moving mirror 6 is the second movable pulley 21 and the first movable pulley 21.
It is fixed to the wire 16 at an intermediate position 23 of the fixed and t pulleys 18. Therefore, when the scanning pulley 19 rotates clockwise in FIG.
The first movable mirror 5 that is set moves rightward at the circumferential speed of the second movable mirror 6, the second movable mirror 6,
7 moves at a speed of % of the circumferential speed of the scanning pulley 19. This scanning pulley 19 is connected to the output shaft of a motor for driving an optical scanning mechanism by both wheels, and when the motor rotates in the opposite direction, i1
J1 rotation, and the first 1'1-if moving mirror 5 and the second [1 moving mirror 6, 7] reciprocate left and right in FIG. 1 at a prescribed speed.

Figure 3 is a partial level view of the Zo-Latin cover device;
The figure is a top view of the recovery part. In those drawings, the first
Light 4) H! 14 is antishin, held in 1kasa 24, anti(hl
'7';:, 24 is formed into a cliff circle shape to collect light. Rotating east 25.26 are provided at both ends of this reflection 'ζ9, and ray/L/27, 28.
, l can be moved. Further, on one end side, there is provided a melee 1 part 30 that is guided by a guy 1 bar 29 provided on the rail 2sl, and is configured to prevent the mixing 24 from coming off the rail. There is.

A wire 31 is connected to the side plate 27' where the rail 27 is connected 11 times.
A fixed pulley 32 and a drive pulley 33 are provided, and a drive motor 34 is connected to the drive pulley 33 by a single wire or a gear, and the 151 motor 34 rotates in both directions. :l! 7, it is configured to rotate reversibly. And the violation Kasa 24 is that the 1st Kota 14 is the above-mentioned 1st ul' movement 5 and the sentence 1 corresponds to the position 1, and the Wai A131
It is fixed at 36 parts. Therefore, the first light source 14 moves linearly in two sets t in the directions of arrows A and A' by driving the drive pulley 33.

Here, the first nT moving mirror 5 and the first light source 14 must always move correspondingly. Therefore, the optical scanning groove opening drive motor that drives the scanning pulley 19 of the optical scanner (74) of the main unit 1 and the drive motor 34 that drives the drive pulley 33 for moving the first light source 14 are operated by the same 11JI II motor. , and the first [+J moving mirror and the first optical waveguide 1 are configured to move at the same speed.

The present invention having such a configuration? When copying originals such as X-ray photographic film or thick opaque film using a copying device, the second part of the original is illuminated with light.
1 and scanning, the light from the light source does not have to pass through the jit document as in the past, and only needs to pass through the irradiation (see through), so there is less light degradation.
The quality of copying with the same light/II;i is the same.

FIG. 5 is a schematic diagram of a main part 11'4 showing an embodiment of a song according to the present invention. In this embodiment, a second light source 36 is provided integrally with the first movable mirror 5. The main unit 1 is provided with a switch (not shown), which, when turned on, causes the first light source 140 to turn on, synchronizes the first light source 14 and the first movement reflector 5, and controls the second The first light source 36 is connected so that the light source 36 is turned off, and when the second light source 36 is turned on, the second light source 36 is connected so that <1 (+') and the first light source 1
j, , l, I with a second switch connected to turn off the light of 4 and release the synchronized drive with the 111th moving mirror 5.
S has been completed.

The switch is the queen, and there must be two zushi, not the pillow, but the first light #
t'i'7i blj so that the lighting of H36 can be changed. Also, the first
The light source 14 may always be moved together with the first river motion mirror 6, and in this case, if the first i1+:H4 is lit, the second light source 36 must be turned off. , and vice versa.

Furthermore, if the first potential source (1t) is provided with a control switch or is used as a control switch, it is possible to respond to variations in film quality by χ1.

In the case of such a (1-1 configuration), the first switch
It is possible to copy special films such as line photographic film, and by using the second switch, it is possible to copy documents.

When copying ordinary originals, there is no problem if the original is thick, but if the original is thin, such as second original drawing paper, overhead projector paper, l/lacing paper, etc., the second light source 36 is used. If there are cases where the light from the source is not transparent, the copy will have a black mark on it even though it is a white background, and the copy will become smudged.

In order to eliminate such defects, as shown in FIG. 6, a light reflecting portion 4; It is preferable to provide S. This light reflection member 37 is made of a sheet-like elastic member, and one end is fixed to the winding shaft 38, and the other end is fixed to the reflection shade 24 of the first light source 14. When the light source moves from left to right in the figure, the light reflecting member 37 is wound around the winding shaft 38, and when the light source moves from right to left, the transparent part 13
1) 11
This makes it possible to overcome the problems described above.

Effects of the Invention As described in detail above, according to the present invention, X-ray photographic films and thick cloudy films, which are difficult to reproduce in the original I, Since the emphasis is placed on the light source from ``11.'', the attenuation of the scanning light is small and a good Ifr copy of 111J11!11L can be obtained.

-Also, if the second light source is integrated with the first nf movement/reaction '11.1 mirror and the first light/Il; 1) (It has many effects such as being able to print and print documents with one machine and expand the copying range.

[Brief explanation of the drawing]

FIG. 1 is a 71j: r star part 11° 1-seam 1-ziz j of an embodiment of a photocopying apparatus according to this embodiment, and 21st j is a configuration diagram of an optical scanning mechanism drive section in the same embodiment. 3 and 4 are a partially cutaway top view and a partially cutaway view of the light source driver J'1/i section in the same embodiment, and FIG. 6 is a main part (1" ♂f Configuration diagram Fig. 6 is a sectional view of the contact portion showing an example of the functions of the platen cover device. 1... Main unit, 2... Photosensitive drum, 3... ...transparent document stand, 4...manuscript,
5...First movable autopsy mirror, 6,7...Second movable autopsy mirror, 12...Platen cover device,
13...Transparent member, 14...First light source, 16', 31...Wire, 19...
...Scanning boulis 24... Reflective shade, 26.26
...Rotating wheel, 27.28...Rail,
29...Guide rod, 34...Drive motor, 36...Second light source, 37...Light refraction part paulownia, 38... Winding shaft. Name of agent: Patent attorney Toshio Nakao and 1 other person @1
Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) I: δ light body 1-“tsum, transparent document stand,
A first
A movable reflector, a second movable reflector that moves at a speed of 19 times the speed of the first movable reflector, a lens, and a reflector.
, 1) A main body device having an optical device including a mirror, and 1) a platen cover device that covers a transparent document holder of the main body device described in jI, and a platen cover device 1, described in jf. A first light source is provided at a position corresponding to the first mirror of the main body device, and a transparent part is provided at a position where the drive means for the first light source and a transparent document holder of the main device are placed. An electrophotographic copying apparatus characterized in that the first movable reflecting mirror and the first light source are driven synchronously and moved at the same speed. (2) A second light source is provided integrally with the first rIJ dynamic reflector,
An electrophotographic copying apparatus according to claim 1, characterized in that lighting of the first light source and the second light source is switched by switching a switch. (3) It includes a first switch and a second switch, and when the first switch is turned on, the first light source is turned on and the first light source and the first movable mirror 4/1 are synchronously driven, and the second light source is turned off. The second light source is turned on while the second light source is turned on, the first light source is turned off, and the synchronous drive with the first movable anatomical scope is released. An electrophotographic copying apparatus according to claim (2).