DE1772600A1 - Device for exposure of photosensitive copying material - Google Patents

Description

AGPA-GEVAERT AG Leverkusen »Federal Republic of Germany

Gate direction for exposure of photosensitive copy material

The invention relates to an apparatus for exposing photosensitive copying material and is more particularly only Use in compact devices for document reproduction intended} in which the copy material is episcopically corresponding an original is exposed.

Devices of this type have means for defining the object plane in which the original to be reproduced is arranged is, means for determining a copy plane in which the copy material is arranged, a lens system for projecting the image of the original onto the copy material and a light source to illuminate the original

109821/0670

BATH ORIGINAL

Since the dimensions of such a device are relatively large when the image of the original is projected in its entirety onto the copy material at the same time, has already been proposed to scan the original in such a way that the optical system and the light source travel along the original and the image of the original on a plurality of mirrors wandering copy material is reflected. In such devices where the projection of the image is by scanning occurs, relatively complicated drive devices are required to the appropriate advance of the copy material and the optical projection system

The aim of the invention is to create a compact, reliable and operationally safe device for exposing a stationary light-sensitive copying material corresponding to a stationary original by projection by means of a wandering scanning device.

According to the invention, the device is exposed to light-sensitive copying material corresponding to an original characterized by a stationary one that carries the original Table, with the image being in an object plane, means for defining a copying plane which runs essentially parallel to the object plane and which is formed in such a way that that they keep a sheet of copy material stationary during exposure

109821/0670

BATH ORIGINAL

hold, means for feeding a sheet of copy material from a supply of such material to the copy plane, one in a working direction between the object plane and the copy plane and carriage movable parallel thereto which is provided; with an elongated light source for irradiating the original with a narrow light beam, first reflection means, which are arranged inclined with respect to the direction of travel of the carriage, to reflect the reflected from the original image part in a direction substantially parallel to the direction of travel on second reflection means, further reflection devices for Reflection of the image from the second reflection means on the copy plane, as well as a focusing lens, which is in the optical The center of the optical system is arranged, with the longitudinal axes of the elongated light source a and all reflection devices extending essentially transversely to the carriage track, as well as a light shield provided in the optical path between the object plane and the copy plane and a calibration ' slit opening in this light shield extending transversely to the movement path of the slide, which is arranged in such a way that only the reflected ray of that reflected from the original Part of the image is let through.

The invention is described below with reference to an apparatus for exposing and developing a photographically photosensitive composite material for the production of an image in accordance with the silver complex diffusion transfer method

109821/0670. *

drive described, this material being a non-transparent, flexible carrier sheet, a light-sensitive halosilver emulsion layer and a layer containing a white or colored pigment and a water-binding colloid binder.

However, the invention is not directed to an apparatus for treatment limited by material of this particular composition. On further applications of the device according to the invention in the following description of what is shown in the drawing Embodiments pointed out.

In the drawing shows:

1 shows a schematic longitudinal section of the device according to the invention,

2 shows the electrical circuit diagram of the device,

Fig. 3 is a representation of the mechanism for controlling the greetings and the copy material sheet peeled off from a pile, and

Flg. H- the camshaft mechanism to control the working cycle of the device.

Until the device is mounted in a light-tight housing 50, on which an upper part 5Ί is fitted light-tight. The upper part 51 is provided with a rectangular frame 52 into which a transparent panel 53 is fitted, the upper surface of which the

- 109821/0870 bad original

Forms the object plane of the optical system of the device.

A slide 54- is attached to laterally spaced rods 35 to ensure a horizontal movement! which are attached to the longitudinal walls of the part 51. The upper part of a rod is toothed so that a motor unit M ₁ , vrelche is attached to the carriage by means of a with

the toothed bar engaging pinion the Schiit- * th can bring from the rest position shown in the figure to the right in a working position 57 shown in dashed lines. Then the same motor unit brings the slide into his Starting position back.

The carriage extends transversely to the device between the two longitudinal side walls and in cross section is the slide I-shaped with the longer part running horizontally.

The slide can be a metal housing, the inside and outside of which is painted matt black and which is closed light-tight, with the exception of slot openings 58 and 59 "through which the projection beam from the original into the"

Can enter or exit the housing ·, '' ■ .:

Inside the slide are two tubular Iiaapen 33 »3 ^ $ · a first mirror 60, a focusing lens 61, a second mirror 62 and a third mirror 63 are attached

ouer
Longitudinal axes of these ropes / extend to the device.

108831/0170

The position of the focusing lens 61 la optical path is such that the distance from the object plane to the lens is equal to the distance from the copying plane, measured along the optical axis.

The opening 59 is provided with a diaphragm 64, which under is a spring preload to keep the opening closed in the rest position. When energizing a solenoid 50 the aperture is opened and reaches the position indicated by the dashed line.

The copy plane is defined by a horizontal non-transparent support plate 65 which serves to hold a Kopiermaterialölattes 66, which is drawn from a roll 67 from "such material. The sheet of material, not shown in the figure is on the support plate 65 by means of a glass plate 68 ' The glass plate 68 rests freely on the plate 65, and a lateral displacement of this glass plate is prevented by several stops, not shown, which are arranged around the plate and inserted into the carrier plate 65.

The direct impact of ambient light on the sheet Copy material through the translucent plate 53 is prevented by means of a light shield, which consists of two opaque curtains 69 and 70, which are rotatable

109821/0670

' ^M IAD ORIGINAL

Cores 71 and 72 are rolled. These cores are supported near the lower ends of the removable top 51 of the device. The cores 71 and 72 are under spring tension, which wants to cause the curtains attached to them to roll up. The free edges of the curtains are attached to the carriage in the vicinity of the opposite longitudinal sides of the slot opening 59. Stationary light screens 73 and 74, which are also attached to the top of the device, complete the light screen formed by the curtains.

In the present case, the roller 67 consists of a cylindrical one Cassette with a longitudinal slot through which the copy material can be peeled off from the tern in a light-tight manner the role of such material! ^ y;,:, ielt eats "

If the photosensitive copying material is described in the Manner supplied so the device can be charged in daylight. After removing the upper part 51 with the curtains 69 and 70 the storage of the should 67 is directly accessible.

The devices for feeding a sheet from the copier * .Material roll for the copy plate consist of a first driven one Pair of rollers 75 »76, which by means of a magnetic coupling 28 can be driven intermittently, a cutting device with a stationary knife 77 and einom with this

109821/0670 bad original

Cooperating so-called rotating knife 78, the is fixed in a rod 79 which "when a solenoid 32 is not shown in this figure is excited a short Can perform counterclockwise rotation through a few degrees of angle. The rod 79 has an elongated wedge-shaped Opening through which the material is guided in order to pass through an enlarged opening between the plates 65 and 68

" reach.

A second feed roller 80 which is intermittently fed by a magnetic slip clutch 29 can be driven, stands with its elastic cover through an opening in the carrier plate 65 in front of and easily comes into contact with the back of the copy material lying on the carrier plate, but without lifting the glass plate 68 in the process.

At the end of the plates 65 and 68 is a spring-loaded stop finger 81 provided, which is raised when energized a solenoid 82 to block the path of a sheet that the Would like to leave gap between the two plates 65 and 68.

After exposure, the sheet is advanced and passes between the pod 82 and laterally spaced conveyor belts 83, which rotate at a peripheral speed that is in is essentially the same as that of feed rollers 75 and 76

109821 / 0S70

BATH OWQINAL

The sheet is fed into the treatment unit which comprises a tank 84 with guide plates 85 which are provided with a plurality of small openings 86 through which the treatment liquid can circulate. In the rest position of the
Device takes the treatment liquid through the
dash-dotted line 87. · The compound or composition used for treatment is contained in the usual way in a plastic bag »which is located under the treatment tank and is connected to the inlet 88 of the tank by a flexible conduit
If the plate is raised by means of a lever (this mechanism and the bag are not shown), the bag is compressed and its contents flow into the tank 84. When the lever is lowered, the treatment liquid flows from the tank back into the bag.

The sheet is pressed by the pair of press rollers 90 and arrives on laterally spaced conveyor belts 91, which it from the device transport.

In the lower part of the device are two idch shields 92 and 93 are provided, which intercept the ambient light that can enter the device through the outlet opening 94.

The lower part of the device is also a motor Mg angeord-.net, the aittele control belts or similar devices the

109821/0670

Conveyor belts 91 »the pressure rollers 90, the roller 82, the magnetic slip clutch 29 of the Holle Θ0 and the magnetic clutch 28 of the rollers 75» 76 drives. It also contains Part of a motor M, which drives a camshaft which controls the operating cycle of the device, as well as a transformer and a rectifier for supplying the electrical circuit with direct current. Finally, the device is equipped with a control panel with a main switch 17 »a start switch 18, a switch 21 for selecting the Length of the copy sheet and a control lamp 37 is provided.

The electrical components just described are shown in FIG. 1 not shown, but appear in the electrical circuit diagram of FIG. 2, which is subsequently in connection with the description of a working cycle of the device will be explained.

In this electrical circuit diagram, the microswitch contacts have the same reference numerals as the microswitches provide yourself.

Before copying commences, the apparatus is loaded with a roll of copy material of the type just described. In the case of such a copying material, the imagewise exposure of the light-sensitive layer can be caused by the white pigment

109821/0670

HAD ORIGINAL

containing sends. After the treatment, a Diffusion transfer image in or on the pigment layer generated When viewing the transmission image generated in this way the negative image in the silver halide emulsion layer is shielded from the eye by the pigment layer.

The treatment mixture contains the constituents required to carry out the diffusion transfer process, ie the development mixture, the complexing agents for the unexposed silver halide and the alkaline substances. As is known, however, it is particularly advantageous to at least partially, but preferably take tlie overall developing agent in the composite material _T can be reduced whereby the treatment liquid to a mere alkaline mixture that can be used for very long time canoe.

More details about the composition of the mentioned ' The type of copy material and the treatment mixture can be found, for example, in British patent application 26 50/67 will.

If there is a sheet of copy material on the carrier plate 65, the leading edge of which is raised into its operating position Stop finger 81 and is an original, e.g. a letter or a page of an opened book with the image facing down is arranged on the panel 53, so closes

109821/0670

the operator operates the main switch 17 (FIG. 2) and the start pushbutton switch 18, which is normally open

Through the switch 17, the electrical alternating current circuit the engine Mg, exposure lamps 33 »34 ·» the control lamp and the transformer 38 is closed. With lamps 33, 34 In the present case, it concerns fluorescent tubes, "whose electrical circuit has a starter and a throttle (not shown).

The switch 16 closes the direct current circuit of the motor M, so that this motor carries the cams 41 to 46 The camshaft (Fig. 4) begins to rotate. The cams 41 to each control the microswitches 11 to 16. In the present case Trap is the duration of one working cycle to make a copy, which corresponds to one revolution of the camshaft, > about 12 seconds.

Shortly after the motor M »has started to rotate, the cam 46 enables the lever of the microswitch 16 to be lowered so that the electrical contact of this switch is closed. The motor M continues to rotate until the end of one revolution , and the cam 46 raises the lever of the microswitch 16 again.

10 98 21/0670 bad original

After about half a second, the cam 41 raises the lever of microswitch 11 to »sq that the normally open Contact 11 of this switch now via the contact ag des Relay A, the electrical circuit of the diaphragm solenoid 30 and, via a diode 35, the circuit of the carriage motor. KL closes

The shutter 64 is opened and the carriage 54 begins after | to run right

Immediately after starting its first movement, the actuates Slide no longer the lever of microswitch 19 * so that whose contact, which was kept open, now closes · In this way, by reopening the contact of the Microswitch 11 in the course of the further rotation of the crouch 41 the mentioned circle is not interrupted,

About three seconds after the start of movement, the slide reaches the end position 57t ⁱⁿ which it actuates the lever de · Hikro »ehaltera 20, so that the contact of this switch is closed · This energizes relay A, closes contact a ^ and contact a ₂ switched.

The switched-over contact a ₂ closes the other circuit of the motor H ₁ , so that this motor begins to rotate in the opposite sense and thus the carriage in the Auigangs-

8Af>

109821 / OITO

The diode 35 prevents further excitation of the solenoid 30, so that the shutter 64 is closed.

When the carriage returns, the contact of switch 20 is opened again, but the circuit of relay A remains closed due to the holding contact a ^. Venn the sledge in has arrived at its starting position, the microswitch will 19 opens and the slide stops.

After the beginning of the return movement of the carriage, microswitches 12 and 13 were actuated by cams 42 and 43.

The closing contact of the microswitch 13 closes the circuit the magnetic slip clutch 29, while the contact of the Mikroachalters 12 the circle of the magnetic coupling 28 over the Diode 26 and the closed contact 13 closes.

The exposed sheet is advanced through roller 80 and the roller 82 and the conveyor belts 83 are brought.

The copy material is of the Bolle 67 by Bollen or ValEtn 75 * 76 peeled off and progressively between the plates 6? and 68 lifted, because a defined length of time has been drawn off.

109821/0670 bad original

This length is controlled by means of a mechanism, the position of which is indicated in FIG. 1 by the arrow 96 and which is im each is shown in FIG. 3.

The lifting mechanism has three cams 97 »98 and 99 of circular shape, which are provided with a small incision on their outer circumference. The cams are a Community λ same shaft to rotate freely, and 3ede? Of them is provided with a magnetic coupling 101, 102 and 103 provided on which a drive wheel is mounted.

By means of belts 104, 105 and 106, the drive wheels of the magnetic couplings can be driven by a valve 107, which is set in rotation by frictional contact with the sheet withdrawn by the feed rollers 75 and 76 via the freely rotating counter roller 100. The drive wheels of the magnetic couplings have different diameters, so that the sheet of material 66 is advanced by different lengths depending on which of the cams performs a revolution.

The cams 97 * 98 and 99 each control the microswitches 22, 23 and 24. The microswitch contacts are open when their Remain the lever in the notches of the cams as shown.

109821/0670 '^ ° ^m ' ^NAL

Ittiiii,

The desired length of the copying material becomes medium Selector switch 21 selected. In the present case, the Length 29 cm. Mn corresponding microswitch 22 is in the Circuit of the magnetic coupling 28 switched, and the magnetic coupling 101 of the corresponding cam 97 is excited. The excitation or supply of the magnetic coupling 101 is in Not shown in the drawing, but can be done, for example, by means of a second three-position selector switch that rotates together with selector switch 21 and switches magnetic couplings 101, 102 and 103 between its three contacts and the positive direct current line are. The common contact of the switch is via a normally open contact that is passed through a parallel to the solenoid 28 switched heat is controlled, connected to the negative DC power line.

It should now return to the process of feeding a Referring to the sheet, which is triggered by the excitation of the clutches 28 and 29, the rotation of the Roller 10? by the sheet pulled off the roller 67 the cam 9? rotated, whereby the contact 22

sr ** = "-1.'JFSi second lets äay lure 43 theRkroso holder v-'v. ·" ^: ■■ - ■ ./:'-. ·. so that the slip clutch 29 becomes atroiiloe * * -, "■, ^;: " -p '. ■■ .. ■ - * $ SB ialj ^ silcüh sliat £ tz'oaloB _t ~ & s in 4er Zwi »

u The Vslaen 75 »

IAD ORIGINAL

pull the sheet away from the hell, and the leading part the sheet passes freely over the now freely rotating roller 80 until the squat 97 has completed one revolution. To this At the moment the lever of the microswitch snaps into the notch of the cam, the contact 22 is opened and the magnetic coupling 28 controlling the feed rollers 75-76 and the squat 97 controlling magnetic coupling 101 are de-energized or de-energized. |

A few seconds later, the squat 42 no longer actuates the Micro switch 12, referring to the broken circles of the Clutch 28 does not have any effect, and then microswitches 14 and 15 are actuated in succession by cams 44 and 45.

By closing the contact 14, the solenoid or the coil 31 of the rotatable knife 78 is driven by the capacitor 25 briefly excited, so that the leaf is separated from the cave.

The shortly thereafter closing of the contact 15 leads to the excitation of the solenoid 32, whereby the finger 81 in the of the Sheet is brought to the path to be traversed. This closed contact also excites the magnetic slip clutch 29 via the diode 27 a wide range of times. The roller 80 starts again to turn and pushes the cut sheet forward until its leading edge against the 'interrupting its path' finger 81 hits. Course on the contact opens 19 ft. So that the slip drive of the roller 80 comes to a standstill and

109821/0670

the de-energized solenoid 32 removes finger 81 again of the sheet can get, with a delay of a few milliseconds with respect to the stopping of the drives of the roller 80.

The location of the copy sheet of material is precisely defined, and ψ when the cam 46 the microswitch 16 will open again, coming the device comes to a standstill and is ready for the next exposure.

In the meantime, the exposed sheet was passed through the processing unit, and the excess processing solution was squeezed out by the pair of rollers 90. The leaf is picked up by the conveyor belts 91, and when it is the Device leaving through exit 94 is the manufactured one k copy dry or almost dry.

In the event that the device must be able to automatically deliver a predetermined number of copies, can the device have a counting mechanism known per se, which counts from a preset number of desired copies counts down and the circuit of microswitch 16 after each copy cycle short-circuits until the required number of copies manufactured iat.

109821/0670 * ad original

In a known manner, the device can also have a sensitivity Control for adjusting the density of the copies produced. This control can be in the form of an iris diaphragm in the focusing lens 61 or in the form of a diaphragm adjustable inclination in the .optischen path in the carriage 54-done. The button or handle that controls this iris diaphragm or diaphragm can be mounted on the carriage so that it can be used for the Operator only through an opening in the top of the Housing is accessible during the Buheststellung the device. This prevents a given setting from being changed during exposure.

The invention is not limited to the embodiment described above limited.

The carriage can be designed in this way to reduce the copying time be that exposure is possible in every direction '. For this purpose, the slide can be shown according to Fig. 1 have a rest position on the left and right.

To bring the sled on its course lode sohneil sum standstill 'Bremaeinricbtungen can soap provided ,, These devices can λ .from an electromagnetic brake §μ motor M ₁ b§st®iM! "But * t" s vuxden you successful Brmauxi -.gen thereby: «|| it |||. _it - that aia XonAttieator at the IJattrtesctesg of the drive circles * · of the botore * practice the fifaoklaufideklune that

Motors entiadec. idttspd ··> -

;.: ΐ ^; . . . · / ■ _? i _5; ^ 'i :: ;; ^li': '|': 0l®2 1/0670 »AD ORIGINAL

The mirrors 60, 62 and 6? can be reflective by others Devices are replaced which have the desired light-reflecting properties, ζ · Β · Prism ·

The application of the treatment mixture to the copy material can be done by other known techniques, such as by leakage roller assignments, contact pads, etc.

The treatment mixture can optionally be heated.

After excess treatment liquid by squeezing out has been removed, the copy produced can be heated to speed up or complete the drying of that copy. This drying arrangement may have infrared bar heaters which are mounted on both sides across the bottom of the sheet below the Shield 92 traversed path are arranged, or from a fan that directs hot air onto the leaf. If necessary, the pickling devices can be designed as a separate unit, which a sheet leaves the exit 94 can take «.

The light screen formed by the curtains 69 and 70 can be used

themselves : ··. ^ i-HW modified »arrangement more« Mftmekett »wefeät la diieem

be

than under that

Cores 71 and 72 can be attached in the upper corners.

The use of the exposure device according to the invention is not restricted to the type of copy material described, but also includes other light-sensitive materials, such as electrostatic or electrophotographic copying materials. An apparatus in which the latter types of copy materials can have additional stations for the actual handling of the material, e.g. in the jail of Zinc oxide copying material a corona device to electrostatically charge the material prior to its imagewise treatment, and devices for controlling the level, the composition (toner content) and the temperature of the treatment mixture

Bas according to the invention may also include an exposed sheet SSwischenschritt in the reproduction of originals representing · For example, it may be a Hegatlv of which is a positive tu print, or it may form a matrix with a Mehrsahl is printed copies *

• ■ ·

* Venn the exposed copy of a laterally inverted · Biu eufVtisen _p mgs which BeUehtung the copying material can * duroh the Trlger

'■ "' ~ · * ■ '* ■ V ¹ ■ ■ ■'#. TiS * it, ji · * ■■.

take place, in the d · * copy material through platem i | D * 4 66 pff aaefe ο * · η geriohtrter back §eaefeeben. the

-M

S + m.

tubes, which in the described embodiment formed the light sources 33 iind 3 ^ -, can be replaced by other types of actinic light sources, ζ · Β. by a plurality from conventional incandescent low-voltage lamps or quartz-iodine lamps.

In the embodiment described above, the mechanism for applying a sheet of copying material to the copying plane was such that a sheet was made after it was made of a copy was ready to be exposed in order to achieve a relatively short copy time for one copy. As a result, the measured The next copy will necessarily have the same size unless the setting of the switch 21 is changed during the working cycle, namely immediately after the exposure has taken place.

In the event that this operation is undesirable, the electrical circuit can be modified in such a way that a copy sheet is not brought into the copy plane at the end of a copy cycle but at the start of a copy cycle, which however has the consequence that the copying time for making a copy is increased. The mentioned modification, according to which the copy material at the beginning of a copy cycle through the copy plane (•• above, however, is almost a necessity in that Case · ι dai #M copying material before exposure of a handling

: »# ORIGINAL

-r 23 -

treatment, such as the previously mentioned corona charge.

Furthermore, the arrangement for adjusting the length of the Copy material sheet, in contrast to the discontinuous mechanism described above, can be designed as a continuously operating mechanism, so that the size of the copy material can be selected so that it is nearly, and at least in terms of length corresponds to the size of the original to be copied. The width of the copy material can be changed in As is known, by designing the device in such a way that it rolls 6? of various widths can accommodate. Finally, the devices can hold the copy material sheet stationary in the copy plane during this time the exposure have additional control devices, which have a low mutual separation of the plates 65 and 68 or a reduction in the pressure between these hats during the transport of the sheet of copy material a and almost press the plates together while exposing the sheet. However, the copy material sheet can also be made by means of a • Vacuum frame, which is known as such, et «tionAr be held ·

V "1. *

Claims (1)

Claims 1 · Device for exposure of light-sensitive copy material corresponding to an original »characterized by a stationary table carrying the original» wherein the image is in an object plane, means but ^ definition of a substantially parallel to the object plane extending copy plane, which are designed so that they are a sheet of copy material stationary during exposure hold, means for feeding a sheet of copy material from a supply of such material to the copy plane, a carriage which can be moved in a working direction between the object plane and the copying plane and is parallel thereto and is provided with an elongated light source for irradiation of the original with a narrow light beam, first reflection means inclined with respect to the direction of travel of the carriage are arranged around the part of the image reflected by the oroginal in a substantially parallel to the running direction Direction to «wide reflection means to reflect, further reflection means to reflect the image of the second reflection means on the copy plane, as well as a A focusing lens that is in the optical center of the optical system is arranged, wherein the longitudinal axes of the elongated light source and all Eeflexionseinrichtung extend essentially transversely to the sled runway, as well as 109821/0670 • AD 177260Ü also one in the optical path between the object plane and a light shield provided on the copying plane and a slot opening in this light shield extending transversely to the path of movement of the slide, which such is arranged so that only the reflected beam of the image portion reflected from the original is transmitted. ■ ■ ■■■. '■;; ■ ' ■ ■ "■ 2. Apparatus according to claim 1, characterized in that g e k e η ή "ζ e i c h η e. t that the pocussing lens is between the first and A wide reflection devices is arranged. 3 · Device according to claims 1 and 2, characterized in that the vowel distans from the Object plane to the focus lens essentially the same the focal distance from the plane of the eye to the vocussing lens is. 4. Device according to claims 1 to 3, characterized in that each reflection device is designed as a mirror 5. Device according to claim 1, characterized in that it is calibrated n β t that the light screen has two light-proof curtains has the. on pedestal bias, rotatable * Cores are rolled, which are attached outside the path described by the projection beam, the free original 109821/0670 Ribbons of curtains near the opposite long sides are attached to the slot opening. 6. Device according to claims T to 5, characterized in that a screen is provided, to interrupt the projection beam from the original to the copy material after the exposure is complete. 7 · Device according to claims 1 to 6, characterized in that the feed devices a first feed means for withdrawing a given length of copy material from a supply roll of said material, a cutting device * for separating the sheet from the boll and a second feeding device to slide the sheet of the leaf after being separated from the boll 8 · Device according to claims 1 to 6, characterized in that the copying plane is marked by a horizontal support plate on which the copy material sheet can rest with its back side, and a vertically displaceable transparent printing plate is fixed, which presses the sheet of copy material firmly against the carrier plate when it is applied to the latter. 109821/0670 BATH ORIGINAL - 27 - 9 · Door direction according to claims 7 and 8, characterized in that the second feed device has at least one roller which is driven via a slip clutch which is driven by the carrier plate protrudes and can come into frictional contact with the back of the copy material sheet. 10. The device according to claim 8, characterized gekennzelch- I net that the place of the copy material sheet in the copy plane is determined by the abutment of the leading Xante of the sheet against a sliding stop element, which interrupts the path of the sheet in the working position 11. Device according to claims 7 to 10, characterized in that the lungs of a role of the » like material 'peeled off copy material sheet through a , a cam is controlled, the rotation of the advance of the ^ Depending on the sheet, one complete revolution of this cam corresponds to the length of a copier material sheet. BATH 109121/0670