JPS6048751B2 - electronic copy machine - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electronic copying machine capable of making reduced copies.

Electronic copying machines not only make copies that are the same size as the original (hereinafter referred to as 1-size copies), but also perform magnification conversion, i.e., make copies by reducing the original size (hereinafter referred to as variable-size copies).
It is desirable to be able to do so.

Various magnification conversion mechanisms have been developed and put into practical use, but in the conventional ones, when converting the magnification, it is necessary to correct the positions of all the lenses and mirrors of the optical system unit that exposes the document surface. However, the positions of these lenses and mirrors are corrected by completely separate mechanisms that are not related to each other, which makes them mechanically complex and is a factor in increasing costs. Furthermore, since these elements are not fixed in accurate positions even after they have been moved, mechanical vibrations are transmitted to the lenses and mirrors, which is inconvenient. Furthermore, since correction of the lens involves rotational movement with respect to the optical path, a complicated movement mechanism is required and there is a risk that the size of the lens will be significantly increased.

The present invention has been made based on the above circumstances, and its purpose is to correct the position of the mirror by associating it with the movement of the lens during magnification conversion, and to securely fix the mirror, thereby improving precision. The present invention also aims to provide an electronic copying machine that can be miniaturized.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the figure, reference numeral 1 denotes a main body of an electronic copying apparatus, and a document table 3 on which a document 2 as an object to be copied is placed is provided on the upper surface of the main body.

Below the document table 3, an optical system unit 5, which will be described later and is supported by a guide rail 4 and connected to a drive source (not shown) and moves relative to the document, is provided so as to be able to reciprocate in parallel with the document table 3. A light beam 6 is formed. At the incident position of the reflected optical path 6 (there are first and second incident positions A and B, which will be described later depending on the magnification ratio), there is an exposure table 7 arranged parallel to the document table 3, and this exposure table 7. A photosensitive paper support belt 8 that slides on the upper surface, and a support roller that extends the photosensitive paper support belt 8, is connected to a drive source (not shown), and is capable of moving the belt 8 in the direction of the arrow in the figure, and whose moving speed can be adjusted. A photosensitive paper support mechanism 10 consisting of 9... is provided. On the other hand, paper is fed to one side of the main body 1 from a paper feeding section 11 that feeds photosensitive paper P, which is a photosensitive member wound in a roll. The photosensitive paper P fed from the paper feed section 11 is conveyed along a conveyance path 12 consisting of nipping conveyance rollers, conveyance rollers, a conveyance belt, a guide plate, and the like. The conveyance path 12 faces the tray 13 provided on the side wall of the main body 1 via the photosensitive paper support mechanism 10, and is located between the paper feed section 11 and the support mechanism 10.
A cutter section 14 that cuts the photosensitive paper P into a specified size and a charging section 15 that charges the photosensitive surface of the photosensitive paper P are provided along the cutter section 14 . Note that a branch conveyance path 12a for manually feeding photosensitive paper merges with the conveyance path 12 on the front side of the charging section 15. Further, a developing section 16 that develops the exposed surface of the photosensitive paper P along the conveyance path 12 between the support mechanism 10 and the tray 13 is provided.
And a heat fixing section 17 for fixing is provided. Next, the optical system unit 5 will be explained. That is,
This includes a lamp 18a which is a light source provided on the top of the lens house 18, a mirror lens 19 provided in the lens house 18 as an imaging device, a first fixed mirror 20, a movable mirror 21, and a second mirror. As shown in FIG. 2, the mirror lens 19 is supported by a lens displacement body 23, and a fixed mirror 22.
1 are each supported by a mirror switching mechanism 24 as a moving device. The lens displacement body 23 includes a pair of rails 24, 24 provided in the lens house 18 in the same direction as the guide rail 4, a roller 25a that rolls into contact with one of the rails, and an L-shaped support piece 25b that fits into the other. and a support 25 to which the mirror lens 19 is attached and the support piece 25.
It consists of a plate-shaped operating cam 26 provided at b. In addition,
A rod 27 is erected on the support piece portion 25b,
This is connected to a magnification conversion knob 28 provided on the top surface of the main body 1 shown in FIG. 1 via a magnification conversion mechanism (not shown). That is, by rotating the magnification conversion knob 28, the rod 27 and the support 2 are
5 is displaced to a position according to the magnification, and moves the mirror lens 19. On the other hand, the mirror switching mechanism 2
4 is a mirror hole 29 that supports the movable mirror 21 and has bent pieces 29a (only one shown) at both ends thereof, and a mirror hole 29 that is loosely fitted into a through hole 29b formed in the bent pieces 29a of this mirror hole 29. A pivot pin 30 that rotatably supports this, and a mirror hole 29 are connected to the mirror lens 19.
It consists of a tension spring 31 that always elastically biases rotation in the direction, and a receiving pin 32 that projects from the bent piece 29a facing the support piece 25b. The receiving pin 32 engages the operating cam 26 when the mirror lens 19 moves in this direction.
The movable mirror 21 is rotated to a predetermined position. Further, in the biasing direction of the tension spring 31, support pins 33, 33, which are supports only in FIG. The mirror lens 19 which is biased by the mirror lens 31 is received therein. On the other hand, near the magnification conversion knob 28, there is a power button 34a and a copy button 3.
4b, a multi-copy dial 34c for setting the number of copies, etc., forming an operation section 35. Next, the operation of the above embodiment will be explained. First, let me explain about the first copy magnification, which is the same size copy.
Place the original 2 with the original side face down on the original table 3, and press the copy button 34b. Then, the photosensitive paper P is fed out from the paper feed section 11, cut into the same size as the original 2 by the cutter section 14, and further charged by the charging section 15. And this photosensitive paper P
is guided by the photosensitive paper support belt 8 on the exposure table 7, and stops reaching the rear end or a position substantially opposite to the first incident position A, and the lamp 18a emits light onto the document surface. At this time, the mirror lens 19 and the movable mirror 21 are in the position shown by the solid line in FIG. That is, the original 2, the first fixed mirror 20, the mirror lens 19, and the second fixed mirror 22
A first optical path is formed by forming a projected image on the photosensitive paper P from the first incident position A. In detail, by setting the magnification conversion knob 28 to the same magnification, the actuating cam 26 contacts the receiving pin 32 and rotationally displaces the mirror holder 29, so that the first fixed mirror 20 and the mirror lens 19 are As the optical path between them becomes shorter, the movable mirror 21 moves out of the first optical path from the mirror lens 19 to the fixed mirror 20. At the same time, the optical system unit 5 moves rightward in the figure to scan the document surface with a slit and expose the photosensitive paper P. At this time, since the photosensitive paper P is stopped as described above, there is a 1:1 relationship between the scanning speed of the document surface and the exposure feed rate of the photosensitive paper P. Therefore, the charge on the photosensitive surface of the photosensitive paper P disappears according to the amount of light, and an electrostatic latent image of the same size as the original surface is formed, and when the slit scanning of the original surface ends, the exposure of the photosensitive surface ends. , (when the first incident position A reaches a position substantially opposite the leading edge of the photosensitive paper) the lamp 18a
goes out. After the lamp 18a is turned off, the optical system unit 5 moves to the left in the figure and returns to its original position. Next, the photosensitive paper P starts moving by the photosensitive paper support belt 8, and
6, colored particles (toner) in the developer adhere according to the charging pattern, and the electrostatic latent image becomes a head image.

The photosensitive paper P is then guided to a heat fixing section 17, where the toner image is fixed, and the paper is discharged onto a tray 13. Next, reduced-magnification copying at the second copying magnification will be explained.

Normally, when scaling down or changing the magnification, the position of a lens mirror or the like for guiding the image on the document surface to the photosensitive surface is changed, and the scanning speed of the document surface is increased relative to the exposure speed of the photosensitive surface. The same applies to the present embodiment; first, the original 2 is placed on the original platen 3 and the magnification conversion knob 28 is rotated to match the reduced copy size. Then, the mirror lens 19 and the movable mirror 21 are displaced to the positions indicated by two-dot chain lines in FIG. 1, and the optical path length is corrected.
In addition, in detail, by rotating the knob J28, the support 25 separates from the first fixed mirror 20 and stops,
Accordingly, the actuating cam 26 separates from the receiving pin 32. Therefore, the movable mirror 21 is urged by the tension spring 31 and comes into contact with the support pins 33, 33, and the mirror lens 19
and enters the second optical path from the movable mirror 21 to the movable mirror 21. The second optical path is different from the first optical path on the photosensitive paper P. Note that at this time, since the pivot pin 30 is loosely fitted into the through hole 29b, the position and angle of the movable mirror 21 are regulated by the support pins 33, 33 regardless of the pivot state of the mirror holder 29. Become.

Further, when the copy button 34b is pressed in this state, the photosensitive paper P is cut, charged, and conveyed onto the exposure table 7, as in the case of the same-size copy described above. Note that the cut size of the photosensitive paper P at this time is different from, for example, the same size, and is a size corresponding to the reduction ratio smaller than the original 2. (However, the size is not limited to this and may be the same as the original 2.) Exposure table 7
The photosensitive paper P conveyed upward is placed at the first incident position A.
When it reaches a position substantially opposite to the second incident position B, which is different from the second incident position B, it is temporarily stopped. Then, the lamp 18a lights up and the optical system unit 5 starts moving in the same direction (to the right in the figure) at the same speed as in the case of the same magnification, and in synchronization with this, the photosensitive paper P is moved by the photosensitive paper support belt 8. Moved to the right in the figure. That is, the document surface is slit-scanned by the optical system unit 5 and the photosensitive paper P is exposed. At this time, the exposure speed of the photosensitive paper P (the relative movement speed of the optical system unit 5 with respect to the movement of the photosensitive paper P) ) is slower than at the same magnification, in other words, the traveling speed of the original 2 becomes faster than the exposure speed of the photosensitive paper P (7). Therefore, the charge on the photosensitive surface of the photosensitive paper P disappears in accordance with the amount of light, thereby forming an electrostatic latent image that is smaller than the image on the document surface. When the slit scanning of the document surface is completed and the exposure of the photosensitive surface is completed, the lamp 18a is turned off, and the optical system unit 5 then moves to the left in the figure and returns to its original position. Note that the folding position of the optical system unit 5 at the end of exposure remains the same as at the same magnification as described above, but as the photosensitive paper P moves to the right in the figure as described above, and the reduction rate ( Since the photosensitive paper P is cut to a size of (the faster the moving speed is, the slower the exposure speed is, and the larger the reduction ratio in the moving direction of the photosensitive paper P is), the second incident position B is the photosensitive paper P.
(This is of course true even when the photosensitive paper P is cut to a size larger than the size corresponding to the reduction ratio, for example, the same size as the original 2.) However, in this case, it is necessary to provide an allowance for the length of the exposure table 7 so that the leading edge of the photosensitive paper P does not protrude above the exposure table 7 at the end of exposure. Next, the photosensitive paper P on which the reduced electrostatic latent image is formed starts to be moved again to the right in the figure by the support belt 8, and after this, the same predetermined copying operation as in the case of the same magnification described above is performed. As a result, a reduced copy image is formed on the photosensitive paper P.

Although the support body 33 is composed of a pair of support pins, the present invention is not limited to this. If the mirror holder 29 is pivotally supported in a loose manner, it may be supported at three or more points, or it may be supported in a planar manner. It's okay. As explained above, according to the present invention, the movable mirror is displaced to the optical path or out of the optical path as the lens moves during magnification conversion, so the movement of the lens and mirror can be correlated, and the mechanism is simple. As a result, the device can be made smaller, and magnification conversion can be performed more accurately and easily.

Furthermore, the present invention has the following effects.

1 A fixed mirror, a movable mirror, and a mirror lens are integrated into a unit, and this unit as a whole moves relative to the document, so the optical positional relationship within the unit does not change, so a clear image can always be obtained. Obtainable.

2. Since the movable mirror moves in accordance with the movement of the mirror lens, the positional relationship between the movable mirror and the mirror lens is uniquely determined, and the optical path length can be reliably corrected during magnification conversion.

3. Since the movable mirror moves forward and backward with respect to the second optical path by rotating, the moving mechanism of the movable mirror is significantly simplified, the device can be made more compact, and the movable mirror can be positioned accurately. .

4 The first optical path and the second optical path have different incident positions on the photoreceptor by the movable mirror, so the movement of the mirror lens during reduction requires rotation around the optical path. do not have.

Simply performing a linear motion along the optical path or in a direction perpendicular to the optical path simplifies the mechanism and allows the device to be downsized. Furthermore, by changing the incident position, the image forming area during reduction can be changed.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a schematic vertical sectional view of an electronic copying machine, FIG. 2 is a perspective view of the main parts, and FIG. 3 is a side view thereof. 2... Manuscript, P... Photosensitive paper, 19...
...Mirror lens, 20...Fixed mirror,
21...Movable mirror, 5...Optical system unit, 23...Luns displacement body, 24...
・Mirror switching mechanism.

Claims (1)

[Claims] 1. In an apparatus in which an object to be copied is fixedly placed on a document table and an image of the object to be copied is formed on a photoreceptor, the first position is a position that receives light from the object and has the same magnification. an imaging device including a mirror lens that forms an image of the object at a reduced magnification by moving from the image forming device to a second position, and when the mirror lens of the imaging device is in the first position; The light from the mirror lens is directed along the first optical path and along the first optical path.
a fixed mirror that guides the light from the incident position to the photoreceptor; and when the mirror lens of the imaging device is in the second position, the light from the mirror lens is directed to a second optical path different from the first optical path. a movable mirror that guides the photoreceptor from a second incident position along the axis and different from the first incident position; and a movable mirror that moves the mirror lens from the first position to the second position. and a moving device that rotates in conjunction with each other so as to be located in the second optical path, and
When the entire unit is moved relative to the photoreceptor and the object to be copied, and the mirror lens of the imaging device is moved from the first position to the second position, the speed of movement relative to the photoreceptor An electronic copying machine is characterized in that it increases the moving speed of the object to be copied and obtains a copy of the object at a reduced magnification from the same magnification.