DE1272721B - Apparatus for developing sheet-like electrophotographic recording material - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

G03g

German class: 57 e - 15/06

Number: 1272721

File number: P 12 72 721.8-51 (F 38775)

Filing date: January 16, 1963

Opening day: July 11, 1968

The invention relates to an apparatus for developing sheet-shaped electrophotographic materials Recording material, with the axially parallel to a development roller, which is in the developer submerged application roller is in frictional connection and to apply the developer serves on the sheet-by-sheet continuous sheet of recording material, a pressure roller on the developing roller arranged opposite side of the recording material and one of the recording material actuatable switch is arranged.

It is known to operate such devices continuously. Since the sheet-shaped recording material usually do not adjoin one another closely during transport through the device sometimes both rollers acted upon with developer liquid. This means that there is an increased consumption of developer liquid and brown stains may form on the back of the recording material.

In another previously known embodiment of the device is not with rollers, but with Nozzles worked for applying the developer liquid. The developer liquid is dispensed in this case by means of a scanning device that responds to the sheets that are passed by. These nozzles however, have the disadvantage that the sheet-like recording material drags over the nozzle edges and can be scratched in the process. Therefore, only those described at the beginning are for special qualities Devices with roller application applicable.

The object of the invention is to be seen in the abovementioned disadvantages in the case of those working with rollers Fix fixtures.

The solution to this problem is that one of the two rollers, between which the recording material is guided, on another roller, which is fixedly mounted in the area of the stationary, movable back and forth, arranged with one-sided stationary attached tension springs connected adjusting device is that in the operating position under tension of the tension springs presses one roller against the other roller, and that the drive of the adjusting device with the actuatable from the recording material, as Switch-on device serving as a switch as well as with a time switch acting as a switch-off device connected is.

It is thereby achieved that the device has a very economical consumption of developer liquid shows and the recording material is not damaged.

According to a particular embodiment of the device for developing sheet-shaped
electrophotographic recording material

Applicant:

Paint factories Bayer Aktiengesellschaft,

5090 Leverkusen

Named as inventor:

Udo Brenneisen, 5090 Leverkusen;

Dr. Gerhard Heyl, 5000 Cologne-Stammheim;

Heinrich Marusczyk, 5672 Leichlingen

invention is the adjusting device as a cam operated with stop disks provided, bow-shaped slide that carries one of the two rollers with their pins is mounted in horizontal housing slots, with two-armed, Lever rotatable around pegs fixed to the housing act, which at one end by means of tension springs on the housing are attached, and wherein the cam disks with one over the switch by a clutch connected drive are provided, and after one revolution with their cams over the lever operate an off switch for the clutch.

This embodiment allows perfect and safe work and is particularly easy to manufacture.

According to an alternative, also very favorable embodiment, the adjusting device is for a of the two rollers is designed as a rotatably mounted, two-armed lever which, on the one hand, is attached to the housing attached tension springs and on the other hand is hinged to an electromagnet with a pull rod, wherein the electromagnet with the on-switch actuated by the recording material and with an as Switch-off device serving electrical time switch device is connected.

809 569/488

Some preferred embodiments of the invention under the inlet and outlet slots 3, 7 for

application are explained in more detail on the basis of a drawing, a master copy is arranged.

namely shows In the housing 1 there is also a preferred

Fig. 1 shows the device in longitudinal section, tubular light source 34 and a reflective

F i g. 2 shows the device according to FIG. 1 at ab- 5 gate 35 for the exposure of the lighting station 4, 5

taken housing wall and, in an enlarged form, of recording material passing through it as well as a

position, deflection mirror 36 and a lens 37, which the

F i g. 3 details of the device according to the master copy passing through the lighting station

Fig. 1 and 2, partly in section, partly in the stripes on top and the right way round on the exposure

view, and io tungsstation 26,27 continuous recording

Fig. 4 depicts a further advantageous embodiment material,

the device. The waves of the aforementioned transport rollers on

In the device shown in Fig. 1, the transport path of the copy original and the recording

If it is an optical continuous copier, the recording material is not shown on the side

in which the master and the recording board 15 rotatably mounted and are of a

material during the exposure process with the same electric motor, also not shown, via

cher speed by a lighting or suitable drive means, z. B. chains or V-belts,

Exposure station are passed through. The co-joint and with the same peripheral speed

pier template is episcopically illuminated and powered.

Scale 1: 1 in strips on the recording board. 2 and 3 is the development device

material shown. device 30, which when opening a flap 38 of the housing

Specifically, the in F i g. 1 shown can be exchanged as a whole, performance a housing 1, within which all are shown much larger. This developing device borrowed components are arranged. On a front wall 2 works according to a principle that is based on the difference Housing 1 is an insertion slot 3 25 borrowed charge-dependent wetting one on the for the recording material to which the photoconductive layer of the recording material is attached lighting station with a lower guide plate 4 generated, latent charge image by a preferred and an upper translucent pressure plate 5 wise aqueous dye solution is based, connects. The from the lighting station 4, 5 from the opposite side walls 39, 40 of the Occurring recording material is through a U-30 housing 30 are designed as boards on which shaped baffle 6 to one on the front the individual components of the developing device wall 2 located outlet slot 7 out, are stored by. Under the entry slot 31 of the memorial the master copy from the housing 1 again housing 30 are two guide plates 41, 42 with a sink outlet. For the transport of the master copy arranged through the right running slots, through Lighting stations 4, 5 are used for transport rollers 35 which are spring-loaded sensing levers pairs 8, 9 and 10, 11. 43 of a microswitch 44 protrudes. Under the

In the upper part of the housing 1 there is a guide plate 41, 42 is a transport

through a hinged cover 12, light-tight roller pair 45, 46, the shafts 47, 48 of which are in recessed

closable container 13, in which recordings of the side walls 39, 40 of the housing 30

material in the form of a stack 14 of electrophoto- 40 are rotatably mounted, as well as a curved guide plate

graphic, e.g. B. with a zinc oxide layer 49 on which conveyor belts for copying

paper is loaded. Follow a familiar paper. These conveyor belts include

ter and therefore in FIG. 1 only schematically shown three grooved rollers 50, 51, 52, in their grooves several

Coating feeder 15 conveys the top sheet in each case, endless conveyor belts arranged parallel to one another

from the stack 14 into an insertion gap 16, behind 45, 53, 54 are inserted.

the arcuate guide elements 17 with two On a plate of the housing 30 is a closed

Pairs of transport rollers 18, 19 and 20, 21 arranged with a filler neck (not shown)

are net, through which the recording material seen container 56 is placed, which is through a

a developer liquid formed under the pair of rollers 20,21 arranged under the roller pair

Charging chamber 22 with 50 connected to high voltage holds. This is driven by an electric motor

Spray wires 23 is supplied. driven pump 57 and a pipe 58 in a development

The winder trough 59 emerging from the charging chamber 22 is conveyed, in which an overflow pipe 60,

Drawing material is fed by a transport roller, which is connected to the container 56, a constant

pair 24, 25 detected that it keeps the exposure station tes liquid level.

55 For emptying the developer trough 59 when the plate is not 26 and a translucent pressure-running pump 57, there is also an emptying plate 27. The from the exposure station 26, approximately tube 61 provided with a small cross-section. In 27 emerging recording material is by means of the developer liquid of the developer trough 59 of a pair of transport rollers 28, 29 an electro-immersed an application roller 62, which is supplied with the actual, photographic developing device, 60 on the transport path of the recording material between the transport rollers 45 in a housing 30 with an entry slot , 46 and the guide plate 31 and an outlet slot 32 for the recording 49 arranged developer roller 63 is arranged in friction material and is a separate, coherent connection and forms from the shaft 64 assembly to be described in more detail. is driven by a pair of gears. The shafts After passing through the developing 65, 64, 65 of the rollers 62, 63, their corresponding bearings protrude from the exit gap 32 of the housing, of which only the bearing 30 exiting in FIG. 3 reaches 66 of the shaft 65 is particularly shown by Ausneheinen collecting container 33, which on the end wall 2 mungen of the side walls 39, 40 of the housing 30. An

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the developer roller 63 is a squeegee roller 67 execution of a working stroke set in motion, see above whose axis of rotation 68 is supported in two lateral levers 69 that the top sheet of recording material is. These are stapeis around the axis fixed to the housing 14 to the insertion slot 16 and from there 70 rotatable and are under the action of traction from the charging station 22 and the exposure bar springs 71. S tion 26, 27 is fed. By exposing the

Opposite the developer roller 63 there is evenly charged recording material in

a pressure roller 72, the shaft 73 of which with its load exposure station generates a charge image,

like 74 in horizontal slots 75 of the side walls that the image of the lighting station 4, 5 through-

39, 40 of the housing 30 is displaceable. Both sides correspond to the current copy template,

the pressure roller 72 are on the shaft 73 slide io The transport rollers 28, 29 guide the exposed

76, the recording material 101 (FIG. 2) connected to one another via a web 77 into the entry

are rotatably mounted. The sliders 76 have slots 31 of the developing device 30. Here-

Pins 78, which are also in horizontal slots 79 when the recording material 101 passes between

of the side walls 39, 40 of the housing 30 slidably the guide plates 41, 42 and pushes with his

are. 15 front edge the feeler lever 43 of the microswitch

At the level of the pressure roller 72 are two 44 by pivoting counterclockwise rotating cam disks 80, which on a common shaft sense to the side, whereby the microswitch 44 is

81 are stored. This protrudes through horizontal slots, the magnetic coupling 97 is in function

82 of the slide 76 through and is in bearings 83 of the occurs and the cam disks 80 in the clockwise rotating side walls 39, 40 of the housing 30 rotatable. The 20 senses begin to rotate. The cams 84 leave cams 84 of the cam disks 80 interact with the disks with their rear edge the disks 85 of the slides 85, which are positioned on the pins 78 of the slides 76 precisely when the front edge of the over 76 are fixed. Recording material sheet 101, which meanwhile

Has been detected on the bearings 74 of the shaft 73 of the pressure roller by the transport rollers 45, 46, 72 two-armed levers 86 act, which has reached the developer roller 63 around 25 fixed to the housing. Through the way-tenon 87 are rotatable and under the action of the cam 84 of the disks 85 wander tension springs 88 stand. These strive to push the slide 76 under the action of the pressure roller 72 to the developer roller 63 to- tension springs 88 to the right until the pressure roller 72 to press. on the back of the recording material sheet

The drive device of the development device 30 101 has arrived and this with its front side

device comprises a drive shaft 89 which presses against the developer roller 63 with the elec- tron. With further

tromotor the entire appliance-positively comparable passage of the recording material sheet 101 be-

is bound and two gears 90, 91 carries. Weh- see the developer roller 63 and the pressure

The gear 90 with a roller 72 on the shaft 64 is developing liquid from the trough 59

the application roller 62 arranged gear 92 35 to the front of the recording material sheet

meshes, the gear 91 meshes with a gear, with a corresponding to the charge

93, which is mounted on a shaft 94. Different wetting of the surface of the image on the shaft

94 is a recording material driving the pair of transport rollers 45, 46 and is thus an imagewise one

of the gear 95 rigid and a further gear 96 development is achieved.

loosely rotatably mounted. The latter can be over a 4 ° When moving the pressure roller 72 from the

knew, only schematically shown magnetic coupling rest position in the working position in which the

97, the clutch disks of which transfer the recording material to the developer via roller 72 (not shown)

Slip rings get tension, presses with the shaft 94 lerwalze 63, also adjusts to the

be positively connected. Spring-loaded feeler levers 99 des

96 meshes with a gear 98, which is on the shaft 81 45 microswitch 100 in the direction of rotation of the clockwise and

of the cam disks 80 is attached. closes switch 100 so that the magnet

On the disc 85 of one of the slides 76 is clutch 97 remains energized even when the open-

the spring-loaded feeler lever 99 of a microswitch drawing material sheet 101 with its rear edge

100 on. The microswitches 44, 100 are parallel to the feeler lever 43 of the microswitch 44 has passed

connected to each other and are in the circuit of 50 and this returns to the starting position.

Magnetic clutch 97. The speed of rotation of the cam disks 80

The drive and the format length of the recording material sheet can also be supplied by the shaft 89.

of the conveyor belts 53, 54 are derived. About the tes 101 are coordinated so that the

Conveyor belt 54 can also straighten a drying cam 80 one full turn

device be arranged. 55 then finish when the recording material sheet

The mode of operation of the front 101 according to the invention with its rear edge, the developer roller

direction shown in FIGS. 2 and 3 in the output 62 and the pressure roller 72 has reached. In this

place is shown with open switches 44 and 100 , the moment the cams 84 are back on the

is as follows: Slices 85 of the slide 76 and push them

By closing a main switch, the 60 is switched on against the action of the springs 88 in the off-drive motor of the device, so that the starting position is returned, with the pressure roller 72 from transport rollers and the application roller 62 with the back of the recording material again unwinding roller 63 and squeegee roller 67 when current is bent. In this case, the magnetic coupling 97 that is loose via the feeler lever 99 will begin to rotate. When the microswitch 100 is actuated. The coupling 97 for inserting a copy master into the infeed 65 is de-energized, the pressure roller remains in the lift-off slot 3 and the next copy is in the starting position for the ordered microswitches (not shown) due to a state in the infeed channel. Thus, when the recording material supply device 15 to the material sheet 101 under the action of its own

7 8

weight and under the guidance effect of the guide target during the development between the guide plate49 falls onto the conveyor belt 53 and through capable support of the electrophotographic pad as well as through the conveyor belt 54 of the possibly piers 101 and the developer liquid an electron present Drying device and subsequent voltage are applied, the ßend is fed to the collecting container 33, 5 rollers 63, 72 must be insulated from one another. this will ensures that the pressure roller 72 is reached by the easiest way that the side developer roller 63 not with developer liquid walls 39, 40 of the housing 30 made of insulating mesh will. material can be produced. The span die in FIGS. 2 and 3 are applied in such a way that the conductive base Lungsvorrichrung is suitable for devices, in the recording of the recording material touching proof drawing material a certain format length roller 72 to ground potential, which is processed with the developer. In contrast, the cam disks form rollers 62, 63 wetted with liquid on chip 80 be placed together with the cams 84 and the discs voltage. To limit the current is 85 of the slide 76 a time switch device, whose a protective resistor in the voltage supply er-switching time in the case of a two-part design of the cam 15 required. Advantageously, the pressure roller discs 80 in the form of mutually adjustable 72 with a layer of conductive rubber over double discs be attracted by changing the effective. Here, the specific cons-total width the cam 84 changed and thus the rubber was chosen so that the different format lengths of the recording rubber layer played the role of protective resistance over material can be customized. Instead of me- 20 takes. The squeegee roller 67 and the mechanical transport time switch device can also be a roller 46 are expediently also rubberized, electrical time switch device of known type be used. smooth metal roller can be used. However, to a In the embodiment shown in FIG. 4, small closed letters converge the developing device can avoid recording 25 when copying texts is a material of variable length can be used without grid-like profiling of the surface of the development Switching time of a time switch device this conveyor roller 63 is favorable. In the case of the in FIG. 3 Ausmatlängen shown must be adjusted manually in each case. The management form is the outer surface of the developer case the embodiment shown there was roller 63 with a winding 109 made of thin metal Most of the components of the device according to FIG. 30 are provided by wire. The wire has a gauge of 0.05 the F i g. 2 and 3 adopted unchanged and up to 0.5 mm, preferably 0.2 mm. with the exception of the rollers 63, 72, not again. Instead, however, the surface profile can be shown. Instead of the cam disks 80, the development of the developer roller 63 also in the manner of gears 96.98, the magnetic coupling 97 and the aim that this roller with a fine Ge microswitch 100 of the object according to the 35 weave (mesh size between 20 and 200 fim) F i g. 2 and 3, however, two come to a frame or metal wire or monofilament textile thread connected lever 102 for use, between with a few millimeters thick layer of porous the pressure roller 72 is arranged, with sem material such as felt, fine-pored rubber or the shaft 73 in recesses of the lever 102 rotating foam, is covered. The surface profilable is stored. The levers 102 are by a margin of the developer roller 63 can furthermore also in The axis 103 fixed to the housing is rotatable and is in the form of a cord, a screwed-in thread Effect of tension springs 104, which reached at the upper end or cup-shaped depressions attack this lever. Furthermore is an electric becoming. Gets into the surface of the developer roller magnet 105 is provided, the armature 106 of which has a threaded intermediate member via a 63 according to the above proposal 107 connected to a rod 108 rotates 45, so this can, for. B. a slope of 0.05 is that between the lower ends of the levers 102 to 0.5 mm, preferably 0.2 mm and a depth of is arranged. The microswitch 44 is 0.37 mm in this, for example. Fall into the circuit of the pull magnet 105. In addition to the shown embodiments of the switched, Subject of the invention, other embodiments are also possible in the last-described embodiment of the 50 forms. For example, the train developing device The microswitch 44 puts magnet 105 in place of adjusting the lever 102 after actuation of the feeler lever 43 through the front of the object of FIG. 4 also for adjustment edge of the recorder slide 76 of the item of FIG. 1 inserted into the slot 31. 2 and 3 nungsmaterials the pull magnet 105 with a short. The cam disks 80 zen delay in tension, so that this the 55 of the article of Figs. 2 and 3 also to the control pressure roller 72 against the force of the springs 104 tion of the lever 102 of the object of FIG. 4 are being used at the moment on the developer roller.

63 presses, in which the front edge of the control of the pressure transport roller pair according to the invention 45, 46 continuous conveyor roller 72 is also advantageous when the ducks Recording material sheet between the roller winding of the latent charge image on the copier 63.72 is located. Only when the rear edge of the paper is not due to different, load-dependent Recording material sheet the feeler lever 43 gige wetting, but on electrophoretic, elecdes Microswitch 44 releases again, is done with the trolytic or other way, same delay the pull magnet 105 off again instead of the pressure roller 72 switched from the developer, so that the pressure roller 72 can be lifted from the roller 63, the back of the developer can also of the recording sheet then just as roller 63 of one of the recording material which is lifted off when the rear edge of the roller or plate leading to the development point ben has reached the developer roller 63. lifted and depending on the run of the

Copy paper can be controlled. This variant of the invention is particularly advantageous when Powdery developer is used, which has a depending on the recording material throughput automatically controlled magnetic roller applied to the photoconductive layer of the copy paper will.

Instead of loading the copier with a stack of sheet-shaped recording material, Rolled material can also be used, which is through before charging and exposure a cutting device built into the device according to the format length of the master copy cut and then sheet by sheet to the individual treatment stations of the developing device is fed.

Needless to say, the conveyor belts 53, 54 need the drying device (not shown) not necessarily to be included in the housing 30 of the developing device. In the latter The case would be instead of the exit slot 32, an exit slot on the bottom of the housing 30 below the Guide plate 49 is provided.

Claims (3)

Patent claims: I. Apparatus for developing sheet-like electrophotographic recording material, in which a pressure roller on the side of the recording material facing away from the developing roller is axially parallel to a developing roller, which is in frictional connection with an application roller immersed in the developer and which is used to apply the developer to the recording material passing through sheet by sheet and a switch which can be actuated by the recording material is arranged, characterized in that one of the two rollers (72, 63), between which the recording material is guided, can be moved back and forth on another roller (72 or 63) which is fixedly mounted in the area of the other roller , is arranged with one-sided fixedly attached adjusting device, which in the operating position under tension of the tension springs presses one roller (72 or 63) against the other roller (63 or 72), and that the drive of the adjusting device with that of the Au is connected to a switch which can be actuated as a switch-on device and a timer switch which acts as a switch-off device. 2. Apparatus according to claim 1, characterized in that the adjusting device as a U-shaped, actuated by cam disks (80, 84) and provided with stop disks (85) Slide (76) is formed which carries one of the two rollers, which with their pin (73) in horizontal Housing slots (75) is mounted, on the in the slots (75) movable bearings (74) two-armed levers (86) which are rotatable about pins (87) fixed to the housing and which act at one end by means of tension springs (88) are attached to the housing (39), and that the cam disks (80, 84) with a drive (96, 98) connected by a clutch (97) via the on / off switch (44) are and after one revolution with their cams (84) via the lever (99) an off switch Press (100) for the coupling (97). 3. Embodiment of the device according to claim 1, characterized in that the adjusting device designed as a rotatably mounted, two-armed lever (102) for one of the two rollers on the one hand to tension springs (104) attached to the housing and on the other hand to an electromagnet (105) is articulated with a pull rod (107), the electromagnet with the on-switch (44) actuated by the recording material as well as a switch-off device serving electrical time switch device is connected. Considered publications:
German patent specification No. 1 148 139. 1 sheet of drawings 809 569/488 7.68 ® Bundesdruckelei Berlin