DE1935618A1 - Photocopier - Google Patents

Description

Dipl.-Math. Siegfried Knefei

633 Wetzlar

WerfheratraBe 25 · P.O. Box 69

ECE electrostatics and chemical development company, ^ 63 Giessen, Asterweg 45

Photocopier

The invention "relates to a photocopier" in which an original with the help of imaging optics onto an electrostatic charge-carrying paper, a charge-carrying film or the like is imaged and the imaging optics is designed for a change in magnification. -,

Such a change in magnification is provided, for example an original in the standard format DIN A 3 in a DIN A 4 copy to be able to convert or the standard format DIN A 4 into a DIN A 5 copy, on the other hand, the original in A4 size in a copy of the same size »

Essentially, you need two magnifications for this, namely the magnification 1i1 and the magnification 1.iO.7. This change in magnification can be achieved by moving the imaging lens. However, it was felt to be disadvantageous that the original, which is usually arranged on a transparent support surface, is always arranged exactly in the center of the surface be 'because the image of the original should cover the entire size of the photocopy paper and if it is shifted to the side of the original, the image runs out of the image plane. :

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009886/1366

For this reason one has on the support surface for the individual Format marking lines provided, but then hardly any "were useful if the original was, for example, slightly larger than DIN A4 was by adding "for example a technical drawing Incorrectly cut wax. In this case the original covered its own marking lines

The object of the invention is to provide a solution in which the Original can be placed on the support surface without difficulty and a change in magnification is still possible

This object is achieved according to the invention in that on the support surface for the original is provided a constant contact corner for the original and the lens is inclined to optical axis is displaceable.

Namely, it has been found that the centers are different Original format sizes when the Objective can always be projected in the middle of the image plane, if only the original with regard to its formats, d. H. either in portrait or landscape format with reference to the installation corner, depending on which one Change in magnification is desired.

Since this position arrangement is difficult for the user to remember, are provided in a further embodiment of the invention in a first step pushbuttons with switch action, namely for any format change a push button that particular cause the lens to shift automatically.

In a further embodiment of the invention, a sole image is arranged on the pushbuttons or in their immediate vicinity in a second step, which indicates how the original is to be arranged with reference to the contact corner of the contact surface, i.e. either in portrait or landscape format

009886/1866

In a further embodiment, each push button is a copy paper size size assigned

In the drawing is an embodiment of the invention shown, namely show:

Fig. 1 'is a schematic representation of the invention,

FIG. 2 shows a section along the line II-II of FIG. 1,

3 shows the top view of the objective in FIG. 2,

Fig. 4 shows the top view of the device according to Fig. 2, '

Fig. 5 shows a detail of the device.

An original to be copied is placed on a transparent support surface 1. With the help of a mirror 2 and an objective 3, the original "I ^{1 is} imaged in an image plane 4" Conveyor belts 5 pick up an electrostatically charged paper 6 in the image plane 4, on which a latent electrostatic image is generated by the image, which is then " is developed in a gate direction not shown.

In order to achieve a change in magnification in the image, the objective 3 can be pushed ^{into position 3 1.}

The lens 3 is with the help of a motor 13, which is on a Spindle 14 acts, moved · The movement is controlled by a Limit switch 15 limited.

As can be seen from Fig. 3, the guides 16 and for the displacement of the lens arranged at an angle so that they would emerge from the plane of the drawing as shown in FIG.

009886/1866

This ensures that the image is in focus after the lens has been shifted is maintained, the mirror 2 is displaceable in the direction of arrow 18 parallel to itself.

This can be caused by the oblique shift of the lens Original always in one corner of the support surface 1, namely the Reference corner 20 are arranged. Different original positions are shown in dashed lines in the window.

So that the position of the original can be seen, there are push buttons 21 shows the original locations as a diagram.

The images of the original can change with a certain format when moving the lens 3 in the direction of movement of the paper 6 emigrate. This shift is minor. It is achieved by suitable arrangement of the paper 6 in the image plane 4 compensated.

Pig. 5 shows a snap fastener strip. If you press z. B. the with A 3 - A 4 button, then this means that the image of the original is obtained in A4 size. The original itself has the size DIN A3. It is as indicated by the hatched area of the push button on the contact surface 1 to be arranged.

Since a reduction in the image is carried out here, the mirror 2 * is removed from the image when the push button 21 is pressed The position shown in dashed lines is shifted to position 2 and the lens is pushed out of position 3 'into position 3.

Should an original of size DIN A4 on a scale of 1: 1 be transferred to the photosensitive paper are shown, then the button 21 »is to be pressed and the DIN A4 original has this on the button to assume the hatched position

009886/1866

_ 5 -

In this embodiment, the lens 3 is ^{pushed into position 3 1} and the mirror 2 is pushed into position 2 ¹ .

Furthermore, "when pressing other buttons, a DIN A 4— Format can be reduced to a DIF A 5 format, a Dili A 5 format can be mapped to a DIN A 5 format, as well as formats B 4 to B 5 and B 5 to B 5.

A push button is provided for each of these format assignments and a certain original arrangement is necessary.

The right choice of the copy paper format controls at the same time the push buttons 21.

009886/1866

Claims (1)

Claims 1. A photocopier in which an original is printed onto a paper carrying an electrostatic charge, a charge-carrying film or the like with the aid of imaging optics
is imaged and the imaging optics are designed for a "change of magnification, characterized in that a constant contact corner (20) for the original and the objective is provided on the support surface (1) for the original
(3) is slidable at an angle to the optical axis » 2 * Device according to claim 1, characterized in that the adjustment of the imaging lens (3) and optionally
a mirror (2) takes place by means of pushbuttons (21) with a switch action. 3 * Apparatus according to claim 2, characterized in that for each possible ¥ ormatänderung a pushbutton (21) is provided and is arranged on the push button or in its immediate vicinity a diagram showing the arrangement of the original
indicates on the support surface (1) with reference to the contact corner (20), 4 ·. Apparatus according to claim 2, characterized in that each
Print button (21) assigned a copy paper format size
is. 009686/1866 Blank page