DE8428538U1 - PHOTOCOPYER WITH CHANGEABLE IMAGE SCALE - Google Patents

Description

2 7.09, 84

AGFA-GEVAERT Aktiengesellschaft D-509Ö Leverkusen 1 Patent department

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Photocopier with changeable image scale

A-G 1992

The invention relates to a photocopying machine with a variable magnification, and a fixed original holder, a copy paper holder and a in the optical path between the original holder and copy paper holder so along an obliquely to the optical I see axis from one corner of the original holder for dia- ^ 1 metralen corner of the copy paper holder running diagonal 1 shiftable lens, so that when changing the image scale the edges of the original holder adjacent to the corner can be mapped onto the diametrically located edges of the copy paper holder adjacent to the diametrical corner.

A device of the type mentioned is for example |

from DE-PS 20 09 389 became known. Thereby fin- )

Det a variable focal length lens application, 1

wherein the copy paper holder is fixedly arranged. 1

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The innovation, on the other hand, is based on the task in an arrangement of the type mentioned with j

an adjustable lens of constant focal length and adjustable copy paper holder is a special one simple and precise guidance for moving the lens and copy paper holder too create.

This object is achieved according to the innovation by the features of the main claim. Other advantageous features the innovation can be found in the subclaims.

The innovation is explained in more detail using examples. Show it
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Fig.! a schematic representation for explanation

the connections between the individual devices share,

2 shows a view of a device according to the invention for manual operation,

3 shows a view of a device according to the invention with motor drive.

In the figures, the housing of a copier, shown only schematically, is denoted by 1. In the On the surface of the housing 1, the transparent original holder 2 is arranged flat and fixed. One to be copied Original is printed with the side to be copied on the

A-G 1992

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Glass plate 2 stored, with a corner and this be ^ adjacent edges of the original to a corner 2a and their adjacent edges of the glass plate 2 are placed, for exact alignment with your copy paper holder 3 and its corresponding corner 3a. The original is through a lighting system 7 illuminated. Between the original holder 2 and the paper holder 3, which are arranged parallel to one another, is the imaging projection lens 4 with its optical axis mounted perpendicular to the holders 2, 3. The position shown in solid lines in the figures is the position for 1: 1 mapping. figure 1 it can be seen that the right rear corner 2a of the original hai age 2 and thus also the one Original placed on it in the left front corner 3a of the paper holder 3 or the copy paper the same format. Such an assignment of a corner and the adjacent edges of an original to a defined corner and the adjacent edges of the copy is required so that not parts the image of the original next to the copy paper surface and would then not be copied. The two diametrical corners 2a, 3a of the original and the copy lie on a diagonal 6 running through the optical axis 5 of the objective 4 should now be an enlarged copy one that does not fill the full original holder area Originals are made, this smaller original is also placed at corner 2a. To achieve the magnification the lens 4 must be moved closer to the original, z. B. in position 4 ', while the paper holder 3 to a different piece of the position for due to the optical laws

A-G 1992

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the 1: 1 image must be moved away from the original holder 2 into position 3 '. If one were to move lens I] and paper holder only in the direction of the optical axis 5 f , then the image would be a kind of ^! '5 corner 2a of the smaller original over the pa- ' stick out pier holder surface. To get one at corner 2a

To copy applied original in any case so that this corner 2a is assigned to corner 3a on the copy paper, a shift of both the lens 4 and the paper holder 3 in opposite directions along the diagonal 6 by correspondingly different amounts are required. The positions 3 ', 4 ^{1 shown in} dash-dotted lines are settings for a specific magnification. If the lens were moved away from the original holder from the 1: 1 position shown in full and the paper holder moved towards the lens along the diagonal 6 by an assigned amount predetermined by the laws of optics, then the original would be reduced in size, but corner 2a again would be mapped exactly on corner 3a.

To the described, opposite to different The amount of displacement of the lens 4 and the paper holder 3 along the diagonal 6 in a simple manner To realize, at least one, preferably two parallel guide rods are parallel to the diagonal 6 7 stored in housing 1. On the lens mount 4 and at least one, preferably two parallel angle pieces 8, 9 are provided on the paper holder 3, which the guide rod with one through-hole each

A-G 1992

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or grip around guide rods so that the lens and paper holder in the direction of the diagonal 6 along the guide rod 7 or guide rods are guided precisely displaceable. In the embodiments shown according to Figures 2 and 3, the angle pieces 8, 9 are with to the guide rod 7 parallel spindle drives 10 or 11 in engagement. But it could also be worm drives or gear drives or other known types of drive are used. In the exemplary embodiment shown en the threads of the spindles run in opposite directions and have different thread heights accordingly the different opposite shifts of lens and paper holder.

According to Figure 2, a common handle 12 is provided for common manual adjustment of the lens 4 by means of the spindle 10 and the paper holder 3 by means of the spindle 11. The spindle 10 is here with the spindle 11 coupled via a belt or gear drive 13. At the lens mount 4 should have an additional fine adjustment device for readjusting the Be in focus.

According to FIG. 3, each spindle drive 10, 11 has its own Electric motor 14, 15 assigned, both motors of a control circuit 16 known per se so that they depend on the required enlargement or reduction at a selected enlargement or reduction Adjustment and the threads of the spindles 10, 11 automatically make the necessary rotation of the Effect spindles and shift the lens and paper holder. The spindles could also have the same

A-G 1992

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have turns and the motors have different Perform rotations. Transmission with gear drives would also be possible.

Due to the common storage of the lens 4 and paper holder 3 on the common guide rod 7 thus a particularly simple and easy to assemble | and parts-saving adjustment device for various Image scales have been created in a copier.

I A-G 1992

Claims (7)

■ ■ ■ · • · · e ■ · ·· «■ claims 1. Photocopier with changeable image scale and having a fixed original holder, a copy paper holder and a in the optical path between the original holder and Copy paper holder so inclined along a to the optical axis from a corner of the original holder to the diametrical corner of the Kopierpa pierhalter running diagonal adjustable lens, so that when changing the image scale the edges of the original holder adjacent to the corner on the diametrically located, the edges adjacent to the diametrical corner can be mapped of the copying paper holder, characterized in that the lens (4) and the copy paper holder (3) along a guide rod (7) mounted parallel to the diagonal (6) are rotatably displaceable in opposite directions and guided. 2. Device according to claim 1, characterized in that that two parallel guide rods (7) are arranged at a distance from one another. 3. Apparatus according to claim 1 or 2, characterized in that the lens (4) or its socket and at the edges of the Kopierpapierhai age (3) carriers (8, 9) are arranged, which Reach over the guide rod (7) or guide rods with parallel holes. A-G 1992 ■ <t titt * * i 1111t V 4 * * 4 ·4th I i 4JM * * i t it 4. Apparatus according to one of the preceding claims, characterized in that the carriers (8, 9) connected to a drive member (10, 11) which moves them along the guide rod (7) are. 5. Apparatus according to claim 4, characterized in that the drive members (10, 11) worm gear or spindle drives that run over tiines TO drive, preferably a hand crank (12) or at least one electric motor (14 or 15), if necessary. can be driven via further gear parts. 6. Apparatus according to claim 4 or 5, characterized in that drove between the spindle (10, 11) for lens (4) and copy paper holder (3) a belt drive (13) or gear drive is provided and that the two spindle drives (10, 11) different and opposite Have slopes. 7. Device according to one of the preceding claims, characterized in that the worm gear or spindle drives (10, 11) each with one Electric motor (14, 15) are coupled. For this purpose 3 sheets of drawings A-G 1992 * * Ii *. (ti * * t I t t Wed i H i i ti i i * II 11 * * * ι itii ti ta i