DE7116097U - COPY DEVICE - Google Patents

Description

April 26, 1971

ADDRESSOGRAPH-MÜLTIGBAPH CORPORATION

1. Business address. 2. Address: Cleveland, Ohio 44117 Mt. Froepect, Illinois 60056

Babbitt Road 1200 Vfcst Central Road 1800 V. St. A. 'V. St. A.

Copier

The innovation "relates to a copier for developing copy material based on diazo and in particular a device of the type described above, through which a liquid developer is applied in measured amounts to an exposed, sensitized copy material based on diazo to to make dry developed copies.

The process of developing sensitized copy material Diazo based application of relatively small, measured amounts of a liquid developer is disclosed in the US patent 3 4-46 620 of the applicant described and explained.

Apparatus for the above-mentioned process is in U.S. patent applications Serial Nos. 831 685 and 831 399, also belonging to the applicant, described.

In the last-mentioned applications, a developer device is explained, which works with an applicator roller. The application roller is equipped with a uniformly prepared surface, which take up a limited amount of the developer medium serves. Against the surface of the applicator roller and parallel to the axis of rotation of the same, a mechanical Wiping body on, which is used to remove excess developer medium from the surface of the applicator roller is suitable. A second, pressure-applied roller is in drive connection with the applicator roller to move between these ο one developer area to build. Copy material is fed between the rollers and is developed when the fluid and the pressure with it With the help of the pressure roller is applied.

The devices of the aforementioned patent application η work satisfactory to fully developed, versus touch dry copies "ai use minimal amounts of Produce developer medium. However, if very wide copy material based on diazo (i.e. in the range of 100 cm and more) is developed, must the orders or «? ; and the pressure rollers be of the same length or size as the width of the material.

It has been shown in practice that pressure rollers for devices of the length dimensions described above are about 0.45 kp Weigh per 2.5 cm length. For example, a roller 100 cm or more in length would weigh 18 kg or more. The great weight a roller body of this type leads to construction problems, as a reinforced bracket or storage for the Rolling is required. The consequence of this is greater costs in the manufacture of developing devices of this type.

Except for the latter, which can be traced back to the overall length of the rollers Problems arise from the difficulties

Irregularities in the surfaces of the rollers and due to non-uniform ones Prints along the length of the rollers and / or curvatures of the rollers, which "during manufacture or during use develop; Surface irregularities and bends in the rollers can result in non-uniform application des Sntwicklersediuins a «f 3em copy material lead, if this is passed through the development area. As a consequence of this unusable, non-uniformly developed copies result.

The task of the present innovation is based on this therein, a developer device of the type mentioned for developing of diazo-based copy material to be forbidden in such a way that that the disadvantages described can be avoided. The device according to the innovation should be relatively wide, diazo-based sensitized copy material, especially for edging be suitable and can be operated economically by exerting a uniform pressure on the copy material and oino predetermined amount of a liquid developer = medium is applied.

An embodiment of the developer device according to the present innovation has an applicator roller, which is suitable to carry a limited amount of developer agent; the roller is rotatably mounted. Close to the outer surface of the Aud sprag roll extends along the length of the same in a parallel position a pressure exerting blade body which is tangential rests against the roller surface. The area between the blade body and the roller surface is the developer area for the copy material. There is also a second blade body used for dimensioning the developer medium tangentially on the outer surface of the application roller. The second blade body is on the AocRragwalze 180 ° with respect to of the first blade body arranged offset to the

Wr: to compensate for the forces acting.

A body carrying the developer medium, the length of which corresponds to the length of the roller, is located in the area between the blade body applying the developer medium and the Applicator roller. There are several holes or bores in this body; The Sntoricklermedium can be drawn from these bores be pumped onto the blade body used for dimensioning. The developer medium is through the blade body over the The outer surface of the roller is distributed, while excess medium is removed from the surface by the blade body used for dimensioning the roller is wiped off and enters a trough below the applicator roller.

In order to ensure the uniform distribution of developer medium over the roller surface and to prevent drops of the developer agent from forming in the developer area between the surface of the applicator roller and the pressure exerting blade body, provision is made that the pressure exerting blade body is in contact the roller surface is brought after the wiper blade has been applied to the roller surface at a certain time beforehand. The time interval is sufficient to apply a uniform coating of the developer medium on the roller surface. This happens automatically with the help of a new type of electrical circuit and a control joint, which is excited by the main switch of the developer device. In the same way, when the device is switched off, the blade bodies are lifted off the roller surface in a chronological sequence. Lifting the blades from the surface of the applicator roller when the developer device is not in use prevents the roller surfaces from being scratched by the blade body, which could impair the quality of subsequent copies.

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An embodiment of the present innovation is explained with reference to the accompanying drawings.

Figure 1 of the drawings is a top plan view of a diazo based copier with the developer device according to the present innovation; I.

FIG. 2 is a side sectional view of the copying machine according to FIG Figure 1;

Figure 3 is an enlarged side view of the drive for the control body through which the developer medium bomessenden and the pressure exerting blade body of the developer according to the invention on the applicator roller applied or removed from it. The section is taken along line 3-3 in Figure 1; and

Figure 4 is a s schematisehe. -Di agramm the electric circuit for actuation of the developer apparatus of the present innovation.

Referring to Figures 1 and 2 of the drawings, there is a diazo copier 10 shown with a developing device according to the present innovation.

The copier has a housing 14 with a front wall 16, with a rear wall 18, with upper and lower walls 20, 22 and with side walls 24, 26, which the upper, connect lower, front and rear walls.

A lower portion 28 of the housing is shown in Figure 2 of the drawings with an exposure device 30 for copy sheets fitted; with the aid of the exposure device 30 a diazo-based sensitized copy sheet is exposed to light while that sheet is in

a face-to-face contact with an original "is located. In this way, the copy sheet is made using the original "exposed.

The exposure device for copy sheets according to FIG. 2 of the drawings is provided with a rotatable lamp 32, on the outer surface 34 of which is a copy sheet and an original drawing (not shown) are sandwiched to "expose the copy sheet. An endless belt 36 extends si-" around the outer surface of lamp 32 and is movable along rollers 40 and 42 ". A smaller roller 44 is used to move the." 'i.nd 36 to be energized so that it can be guided in close contact with the lamp 32,

The original drawing or the original sheet etc. that in a sandwich fashion Copy sheets located for this purpose are fed via the support 45 into an input 46 near the roller 42 between the endless belt 36 and the outer surface 34 of the lamp 32 is inserted. The original and the copy sheet are carried around the lamp 32 and exit near the roller 38 via an exit. At this Point is the copy sheet exposed. The copy sheet is now separated from the original sheet and is ready for development.

In the upper section 50 of the housing 14 of the copier is located a developing device preferably shown 12 according to the present innovation.

The developing device is provided with an applicator roller 52 provided, the middle wool part 54 is made of metal, while the outer, circumferential covering 56 of a smooth, non-porous and elastic material is made, so made of rubber. The outer surface 58 of the circumferential Topping 56 is prepared in a special way to be used as

To serve as a support surface for a developer medium; as a support surface it has irregular indentations changing Depth and size. A detailed description of the support surface is given below.

The roller 52 is at its ends 60 and 62 of the wall part 54 between perpendicularly extending walls 64 and 66 in FIG the walls attached to bearings 68 and 70 (Figure 1) rotatably mounted. An extension body 72 is at one end 62 of the Shaft 54 attached. A drive motor 76 drives the applicator roller 52 via a shaft 78 which extends from the gear 79 of the drive motor 76 and a sprocket 80 carries. An endless chain 75 is on the aforementioned sprockets placed and serves to transmit the drive of the drive motor 76 to the applicator roller 52 to rotate it to move.

The chain 75 is also guided over Ketton gear wheels 82 and 84 which are arranged on shafts 83 and 85; these waves extend away from the wall 66. The last-mentioned sprockets create a path over which the endless chain extends to drive the applicator roller 52.

On the opposite sides of the applicator roller 52 is in A pair of blade bodies 86 and 88 are provided at a distance of 180 ° from one another. Everyone of the blade. _jrper 86 and 88 is on one Corresponding, rotatable holder attached, which has the shape of a hollow shaft 90 and 92 and each on the hollow shaft having attached blade holding bodies 94 and 96. The blades are each made of a flat component, which is made of Consists of spring steel or a similar material. The blades are on their respective blade holder bodies with the help of fastener on, so fixed with the help of bolts 98.

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The hollow shafts 90 and 92 which are also between the walls 64 and 66 can rotate in the direction of the arrows shown in FIG and 88 come into abutment with the outer surface 58 of the applicator roller 52, as indicated by dashed lines in FIG 2 of the drawings results. As shown, the blade bodies are bent when they are in contact with the roller surface which enables tangential contact.

A tube 100 is attached to an L-shaped bracket 102, which is attached to the blade holder body 94; with the aid of the tube 100, a developer agent is applied to the outer surface 58 applied to the applicator roller 52. A flexible line 104 is connected to sin end 106 of the tube 100 and protrudes a pump 108 with a reservoir 109 of the developer 110 in FIG Link. Medium pumped through line 104 emerges the tube 100 through spaced apart openings 103 (FIG. 2).

The developing medium distributed from the pipe 100 pours out or spreads on the surface 112 of the blade body 86 and comes into contact with the outer surface of the rotating applicator roller 52; the developer gets into that way measured proportions on the outer surface 58 applied.

With the help of the blade body 86, together with the special Prepared outer surface 58 having applicator roller 52 a controllable amount of the developer medium on the to be developed Copy sheet applied. The blade body 86 wipes off excess developer medium which is deposited in a trough 114 is returned. For this purpose, the trough is provided below the applicator roller and the bell used for dimensioning. Excess developer medium is discharged through an opening 116

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in trough 114- (Figure 2) and through a grid-shaped filter 111 diverted into the container 109 so that it can be reused can be fed. The grid-shaped filter 111 serves to remove the smallest paper particles, which can and which can accumulate in the developer during development get stuck underneath the Klingon body without filtering could. In this way, you would leave lines on the surface of the subsequently developed copy sheets. The Hoinigon of the filter 111 happens periodically to the paper particles to be taken from the filter.

As already mentioned, the outer surface 58 of the applicator roller 52 is specially prepared to a predetermined amount to carry the developer liquid, which is used for developing of copy sheets sensitized in the diazo process is used.

The structure or the finish of the applicator roller 52 is essential for the proper functioning of the developer device Meaning. The amount of developer module held on the outer surface 58 of the applicator roller, which the Copy sheets fed depends on the particular surface properties the roller. It has been found that areas of changing depth and size of the recesses are best suited to carry or ingest the appropriate amount of liquid so that when touched dry copy sheets can be developed. The recesses of different depth and size have a certain one Smoothness with average center line on, expressed in millionths of an inch deep. An applicator roller, the surface of which has an average centerline smoothness in the range of 10 to 200 X millionths of an inch has sufficient and satisfactory smoothness according to the present invention. The limits of application of the developer medium with

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Using a suitably prepared applicator roller lie between 0.5 grams and 3.0 grams per square meter of copy material.

A detailed description of the roller surface and their preparation is described in US patent applications Serial No. 831 685 and Serial No. 831 399 of the applicant included.

The second blade body 88 exercises when it rests against the outer surface 58 the roller on this a pressure along a BorUhrungslinie which corresponds to the pressure exerted by the blade body 86. However, the blade body 86 is offset by 180 ° provided on the roller 52. lio contact surface forms an Ehtwicklungsbereich 118 shown in Figure 2 through which the copy sheets to be developed run.

It is essential that those on the w ^ -izen surface applied forces are equal to each other. If this is not the case, there is a no-'gung that the roller shifted or is relocated; at the same time the surface of the roller is deformed. In both of the above-mentioned cases, in in each case the quality of the with the help ·: ι iäntwickeinrichtung made copies.

A copy sheet, which at input 120 in the developing device is inserted manually along the curved guide body attached to the attachment 119 in section 50 of the housing (FIG. 2) into the development area 118 introduced. In this area, the leading edge of the paper between the, exerting a pressure Blade body 88 and the applicator roller 52 taken. By rotating the applicator roller 52 in the direction of the illustrated Arrow, the copy sheet is transported through the development area 118 with developer medium under pressure is applied to the exposed copy sheet. The

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Wrapped copy sheet faces at output 124 in one When the developing device is dry, it is off again.

As previously mentioned, the blade bodies 86 and 88 are attached to blade holding bodies 90 and 92; these can be rotated viOTö-sv. around the Klingon bodies on the outer surface 58 of the applicator roller 52 ai or from the outer surface

The movement of the Klingon body is controlled by a control joint and controlled by an electrical contact system 126 which is shown in detail in Figures 3 and 4 of the drawings are.

The aforementioned contact system 126 has a control joint body which preferably has the design of the cam or control body 128. The control body is substantially circular in shape and is rotatable at its center 13O on the shaft 132 of an electrically actuated Motor 134 (Figure 1) stored. The motor can move forward (intervention) and backward (release) with the aid of intervention and release windings, as detailed below is set out.

Two sets of electrical contact units 136 and 138 have two pairs of leaf spring contacts 136a, 136b and 138a, 138b on. The contacts are made with the help of Stouerlauforrolle 140, 142 actuated, which si ^^ arranged on the stacked contacts by means of additional leaf springs 143 and 145. Each of the rollers of the control runner runs on the outer surface or outer edge 147 of the control body 128. Lead wires are according to Figure 3 of the drawings to the connections of the corresponding Contacts connected. The existing connections at contacts 136a, 136b and 138a, 138b are

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711S09730.9.71

described below _and under diagram explaining the scarf ί shown in FIG.

The control body is constructed so that it has three outer track parts T1, T2 and T3. The tracks are provided at different radial distances, measured from the center of the control body. The rollers 140 and 142 of the control carriages run along these tracks. When the control body 128 is rotated, the contacts of the units 136 and 138 are opened or closed to turn the motor 134 on or off.

A pair of arms 144, 146 is used to turn the rotary movement of the stoucr body 128 into a drive for the movement of the blade body 86 and 88 to be implemented. The arms 144 and 146 are each at a first end 149, 151 by means of fasteners 148, 15Ο (Figures 1 and 3) at a corresponding end 152, 154 (Figure 1) of the rotatable, hollow shafts 90, 92 articulated. Opposite ends 156, 158 of arms 144 and 146 are with the help of a control wheel or a roller 160, 162 on the Stouerkkörcr 128 out. The roles 160 and 162 run in correspondingly cut-out guides or tracks 164, 166, which are located in the control body 128 according to FIG Drawings are located. Iode of lanes 164 and I66 is through a passive track area P1, P2 and formed by an active track area Al, A2. The movement of rollers I6O and 162 triggers along the passive areas of lanes 164 and I66 koine movement of the corresponding blade bodies. The movement in the active areas on tracks 164 and 166 causes that the blades either come into contact with the outer surface 58 of the applicator roller or detached from the outer surface will. This depends on the direction of rotation (clockwise or counterclockwise) of the control body 128. The way of working of the control body 128 and its control runner is explained below.

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Referring to Figure 4 of the drawings, there is shown a preferably illustrated embodiment 170 of the circuit through which the Movement of the blade bodies 86 and 88 in contact with the applicator roller 52 and away from the roller is controlled.

Circuit 170 is powered by a conventional 115 volt AC voltage source (not shown) via terminals 172 and 174. fed in; terminals 172 and 174 are connected to lines 176 and 178. Line 176 is with a first Switching contact 180 of the manually operated on-off switch 182 connected. The switching contact 180 is normally connected to a first contact I84, which in turn is on a lead wire I86 is connected. This is with the normally open contacts 138a of a pair of leaf spring contacts tied together.

A second contact I88 of the manually operable on-off switch 180 is used for pre-binding with the switch contact 180. The Movement of switching contact I8O to contact I88 leads to Infeed of current via line I83 to the pump motor IO8 drive, whereby developing medium is pumped into the tube 100 (Figure 1) and the movement of the blade bodies 86 and 88 commenced will. The pump motor IO8 is connected to the power source via line 178 as a return. The movement of the Switching arm or switching contact I8O to contact I88 is also used for power supply and thus for switching on the drive motor 76, through which the applicator roller 52 is set in rotation will.

The contacts 138a, which via line I86 to a manual Operable on-off switches 182 are connected, are connected via line 192 to the release coil 19O of the motor 134 in connection. This in turn is connected to the electrical voltage via lines 194 and 196, which serve as feedback.

source connected.

The contacts 138a are also connected to the second switching contact 198 of the manually operable on-off switch 182 connected. boron Switching contact 198 "is normally in the open position with respect to contact 2GO. The latter contact is available via the line 202 and via switching contacts 136b of the contact pair 136 as well as via the line 204 with the normally closed sets of contacts 206 of a 3-Se .ynden time delay relay 208 in advance. The switching circuit -? ;; - clock 207 of relay 208 is as feedback using the JY. ■ tion 209 connected to contact I88 of switch 182.

The normally open contacts 210 of relay 208 are via line 212, normally closed contacts 138b, and line 214 back to engine engagement coil 216. The latter coil is via lines 196, 178 to the Power source connected.

Normally closed contacts 138b are provided over line 218 and normal closed contacts 136a of the contact pair 136 and lines 220 and 204 with the normally closed contacts 20b dos time delay relay 208 in advance.

To understand the device according to the present invention The following is the workflow for the individual parts explained.

Referring to Figure 4 of the drawings, circuit 170 is in the normal, not switched on. When the developer apparatus according to the present invention is to be operated, the manually operated on-off switch 182 is pressed down, so that the switching contact I8C from contact 184 · to contact I88

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711S09730.S.71

is moved. On diuso V / oise he opens the connection with the Line 186 uni closes the circuit to drive motor 76 the pump 108 and a further circuit via line 209 and the normally closed contacts 206 of the time delay relay 208.

At this point the applicator roller 52 begins to rotate, while developer medium is pumped from container 110 to tube 100 is to be on the blade body 86 and over the face of the applicator roller to be distributed.

The current is via the normally closed contacts dos time delay relay 208, via line 204 through line 220 and the normally closed contacts 136a and the Lines 218 and 214 routed to motor handle coil 216, in order to set the control body 128 in rotation in the direction of arrow 224 according to FIG. 3 of the drawings. The control body is rotated about 40 ° counterclockwise, as seen in FIG. 3, so that it is in a central position. When the cam body rotates, run the rollers 140 and 142 along its outer edge 147.

The roller 140 remains on the web T1 for a certain time and then moves to the web T2, whereby the contact 136a is opened. Opening the holder 136a (FIG. 4) de-energizes the coil 216, so that the rotary movement of the control body 128 is prevented. At this point in time, the switching contacts 136a and 136b are both in the open position, since the roller 1 $ Q is on the track T2. Roller 142 moves from track T3 to track T2 and causes contacts 138a to close. At this point in time, both contacts 138a and 138b are in the closed state.

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During the rotary movement of the control body 128 by 40 ° the RoUen 160 and 162 likewise along the corresponding one Cutouts 164 and 166 in the control body 128 shifted. The roller 16C has moved along the passive part P1 of the cutout 164 "while the roller 162 has moved along the active part A2 of the cutout 166. On this The ringon body 86 (FIG. 1) used for dimensioning the developer medium is in contact with the surface of the Brought application roller.

During the three-second time delay caused by the Time delay relay 208 is developer medium, which from the openings 103 of the pipe IOC exits, in proportionate proportions over the outer surface 58 of the applicator roller 52 is advantageous. Moved after the three-second time delay has elapsed the switching contact 207 dos relay from the normally closed contact 206 to the normally open contact 210. Power from the 115 volt AC source is now passed to the engine intervention coil through closed contacts 138b 216 directed to the control body 128 in the direction of arrow 224 counterclockwise (Figure 3) to rotate offset.

The cam or valve body 128 now rotates by further 80 ° from its intermediate position. During the 80 ° rotation the roller 142 moves from the path or track T2 to the path T1, whereby the switching contacts 138b are opened.

The opening of the Kentakt 138b interrupts the connection from the power source to the engine intervention coil 216, which is why the engine 134 is switched off and the rotary movement of the control body 128 is terminated.

During the last-mentioned rotary movement of the control body 128 by 80 °, the roller 142 moves through the passive part

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t I

f,

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P2 of the cutout 166 so that no further movement of the Blade body 86 is triggered. However, the roller 160 was moved by the active Toil A1 of the cutout 164, what As a result, the blade body 88 which applies a pressure is pressed against the outer surface of the applicator roller 52 in abutment will.

When both blade bodies are in contact with the rotating applicator roller the developing machine is ready for operation and diazo copies can be made by the developing section 50 the copying machine 10 (Figure 2) passed through for processing will.

Upon completion of the development process, the device will be in is returned to its normal, off position when the manual on-off switch 182 is moved to its off position will. The switching contact 180 of the switch is released from its single grip with the contact 188 and is in contact with it brought contact 184. The switching contact 198 is moved out of its contact with the contact 2CO.

There is now a connection from the 115 volt AC power source to the motor relief or release coil 19O · The connection consists of the power source via lines 176, 186, via contacts 138a and line 192. Contacts 138a remain in the closed position because of the position of the roller 142 on the web T1. When the motor release coil I90 is energized, When the motor 134 (FIG. 1) is actuated, the control body 12b is actuated in a clockwise direction, the direction shown by arrow 224 opposite to set in rotation. The control body moves back a full 120 ° to its original or normal position turned.

During the last-mentioned rotary movement, the blade bodies 86 and 88 are subsequently disengaged from their abutment

711Se97 ⁸ 3ft9.7i

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support roller released; the blade body 88 released, after which the blade body 86 is lifted. This release movement is caused by the movement of rollers 160 and 162 caused on the active and passive parts of the corresponding cutouts, the movement being opposite the aforementioned movement for operation is running.

When they are returned to their original position, they will be contacts 138a open to stop motor 134; the pump motor 108 is switched off.

During the dio preferably shown device for movement the blade body 86 and 88 in contact with the applicator roller 52 and facing away from this from the control body rjad of the circuit explained above is ·: ·· ■. < obviously that the intended follow-up movement can also be brought about by other devices, for example through a series of gears that control the movement of the blade bodies. The drive mechanism for the gears is triggered by a time delay system. Facilities of this type are so for the device after The innovation can be used in the same way.

It has been explained that a development apparatus according to the present invention Invention is provided with a device to blade bodies 86 and 88 in a time sequence in contact with the applicator roller and move away from it. This follow-up movement is essential as it ensures uniform wetting of the Applicator roller ensures before the pressure-exerting blade bodies are brought into contact with the roller. 3s can thereby a faster start-up can be brought about. At the same time it is avoided that the blade body against a still relatively dry roller is pressed, which could lead to adverse effects.

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Claims (1)

Expectations 1. Copier for developing sensitized material by applying measured amounts of developer fluid after allowing the copy requirement, using a rotatable applicator roller, the prepared surface of which carries a certain amount of the developer liquid and a source of liquid developer which is applied to the roller surface, characterized in that a wiping device near the applicator roller (52) U (36) arranged and swiscu.6Äi a working position and a. Buhelage is movable, a pressure-exerting device (88) was provided near the applicator roller (52) and between a work and a rest period in the plant can be moved to the roller surface (58) or can be lifted off it, wherein when it rests on the applicator roller by the the pressurizing entity a development area is formed that a drive device (9 *, 92) the connecting the pressure-exerting device and the wiping device to one another to the pressure and wiping device in contact with the roller surface and facing away from it or between a wiping position and a rest position, and that a control circuit (17 ·) is assigned to the drive device in order to move the printing and wiping units between work and rest position depending on the copy requirement. 2. Copier according to claim 1, characterized in that the drive for the pressure-exerting device and a motor-driven control body (128) is assigned for the wiper device. 711809730.9.71 3. Copier according to spoke 1 and 2, characterized in that that the control formwork has a number of electrical contacts, which can be actuated mechanically by the drive to move the Bruckanlageeinrichtung (88) and the wiper device (86) between their working and resting positions. 4. Copier according to claim 3t, characterized in that the contacts consist of micro-holders (136, 138) located on the control device, which are in contact with profile surfaces (T1, T2, T3) of the control element in order to use the control element to determine the movements of the pressure = system device and the wiper device between their work and booth positions to control, and that the switches can be operated through the surfaces of the control body, in order to switch on the drive motor (76) as long as the switches are in contact with a predetermined part of the control surface, while the motor can be switched off when the switches leave the predetermined curve area. 5. Copier according to claim 2, characterized in that the control body (128) has guides (164, 166) in which engages a set of articulations (144, 146; 160, 162) to common 'the wiper assembly and the To move pressure equipment. 6. Copier according to claim 5, characterized in that the guides have an active area (A1, A2) and one have passive area (P1, P2), so that when the joint body is located in the active area, a movement of the wiper device and the pressure system device is brought about is, while in the case of the joint body in the passive area, there is a back-up system and a wiping device are in an effective working position. - 21 - ■ · PI · i I - 21 - 7 · Copier according to claim 1, characterized in that · the control system contains a time delay device (206) is assigned to bring the wiping device into the working position before the printing device is is at work 8. copier according to claim 1, characterized in that daft the liquid developer can be applied to the roller by a spray device (1 · ©) and that the spray device connected to a container (ΐ · 9) via a pump (1Q6) is. 9 * copier according to claim 1 and 8, characterized in that because the control circuit switches the pump on and off according to the number of copies required. 711109730.9.71