DE2017786A1 - Method and device for producing reproductions of graphic templates - Google Patents

Description

201778G

M 2796

■■ PATENT LAWYERS

Dr .-! I ·:.: · * ^ -ÜiE

Minnesota Mining and Manufacturing Company, Saint Paul Minnesota 55101 (V.St.v.A.)

Method and device for producing reproductions of graphic templates

The invention relates to a method for producing reproductions of graphic originals using light and heat. The duplication process and the paper sheet-like material used for this purpose are similar in some details to the process disclosed in German patent specification -Hr * 1 234 243 (Workman). An embodiment of the _ir Kopiergerätea, -in which daa method and-'Material is used dao Ln represents Patent called "discloses ij% _t LFJ b of the described araürikaniaohen Patdnbu.ihrift IT rs 3 51 (Anderson) ·>

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As described, first becomes a photo-desensitizable Interlayer folded with the original and exposed together with it · Then the interlayer is covered with the copy paper folded and heated. The light-sensitive reagents left on the image areas of the interlayer is transferred to a reagent in the copy paper and reacts with it, with a visible image of the original template is generated

The invention also provides for a reflex exposure of the original and the intermediate layer, after which the intermediate layer and a copy paper is heated and a visible image is produced; ™ however, copying is done at a higher speed and with increased effectiveness when using the sensitive Liner. With the facilities and procedures already known cannot do more than about five copies per minute are produced, while according to the method according to the invention at least approximately five-tooth copies per minute are made using the same interlayer and copy paper · When copying originals in normal formats and those used in legal the already known methods are unable to do so much how to exploit 20 # of the liner while according to the invention the intermediate layer can be used up to 95 # »

| Tucks and other benefits are made with the help of a novel Combination / of components and work processes achieved. Below becomes a particular and currently preferred embodiment using the new principle of delayed development *

In the accompanying drawing, the

? ig «l a diagrammatic representation of an operational Device according to the invention,

Fig. 2 is a side view showing the relationships of the main components pointing to each other and the

®ig * '5 a representation that shows the pressure roller and the associated components according to Pig. 2

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'.Vie shown in Figure 1, the copy re device is arranged in a cabinet 10 to which an operating and setting panel 11 is attached. The upper part 12 of the cabinet is divided into two sections, of which one section is provided with an opening 15 in which a feed shaft 14 is arranged, while the other section is at the rear. is connected to the cabinet by a hinge and forms an access to the device located in the cabinet. The cabinet is provided with an opening 16 on the front 15, in which an output shaft 17 is arranged. The two side walls 18 and 19 are mounted pivotably so that the device in the cabinet is accessible. The one at the Seitenwan- like extension 18 provided opening 20 is an output shaft 21 accessible, the _f if, can be provided with a stopper desired, and serves as a collection point for the manufactured of the machine copies.

The operating and setting panel 11 has a main input and off switch 22, one indicating the operational readiness Lamp 23 »the. Display means 24, a counter switch 25, a Switch for setting the density 26 and a toggle switch for connection to a power source are the corresponding Funds and facilities provided

FIG. 2 shows the relationships between the insertion shaft 14, the return shaft 17 and the delivery shaft 21j and the other essential components of the device. A feed drum 28 carries a photosensitive intermediate layer 29 around appropriately arranged guide rollers on a pressure roller 30 on a light source arranged in a yeast reflector 32 31 over, which liner between a movable Heating plate 33 and a belt 42 passed through to a lift-off rail 54 around and an output unit 34 over to a Take-up drum 35 is guided · In the district of the feed chute is a feed roller 36 and the drive rollers 37, 38 * "■ intended. A lift-off rail 39 is located behind the pressure orphan and a drive roller 39 is arranged, which rail 39 can be adjusted by means of an electromagnet 40. An additional before guide plate 67 forms a continuation of the channel

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between the roller 30 and the rail. 39 when these are in the multiple copy setting is

The belt 42 travels around the idle rollers 43 and 44 around and further over the heating drum, the drive roller 46, the guide roller 48, the tension roller 47 and an idle roller 49 · Parallel to that between the roller 45 and the heating drum 45 extending part of the belt 42 is a guide plate 68, while a further guide plate 55 of the curvature the drive roller 46 follows. From the supply tray 50, copy paper sheets are fed from the feed roller 51 and from the drive rollers 52, 53 conveyed into the device and from the Guide plates 68 and 55 are guided around the drum 45 and into the shaft 21.

The device is controlled by switches 59, 60, 64, 65 and 66 together with the contact elements 61, 63, a payment switch 25 and with the corresponding heaters, delay mechanisms, pumps, valves and other additional devices, as will be described later · The various parts of the device are suitably powered by a single electric motor operated with the help of drive belts; however, other means can be used for this purpose.

The pressure roller 30 shown in Fig * 3 has a smooth perforated outer side 57 and a hollow shaft 58, which communicates with a not shown pump and not shown valves in connection ₉ may be those produced in the roll an over-pressure or 'an underpressure . 3 also shows the arrangement of the drive rollers 37 and 38, the latter roller being provided on the circumference with deep slots into which the sensing elements of the control switches 59, 60 extend. In the absence of a template, the electrical contact elements 61, 63 are with of the drum 30 in contact. Figure "3 also shows the guide plate Sl _9, the lift-off or Abstreifechiene 39, the drive roller 41 and the control roller 62 _s on the periphery at the point of Kontaktelerneutes ait a Eut is provided. These and other components of the Device are stored in suitable frame members ^ which are not shown for reasons of clarity.

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Since mostly copies of originals in normal format (21 χ 28 cm) are required than other formats, the platen 30 is suitably sized to be one sheet so that multiple copies can be made while the original remains on the platen. Jerner can Individual copies can be made in normal format, with the Original is removed from the platen after a single pass. For copying longer or shorter sheets of paper, you can the single copy sequence can be used, with either a number of originals being sequentially fed into the machine or it becomes a single original from the return slot 17 conveyed correspondingly often to input station 14, the operation of the device is described below.

That previously with a roll of the liner and with a The device loaded with copier paper is put into operational readiness by turning on the main switch 22 and through Setting the counter switch 25 to the desired number of Copies, waiting until the lamp 23 indicates the operational readiness of the device, after which only an original needs to be inserted into the input shaft 14. Either before or during copying, the switch 26 can be used to determine the density and thus to determine the appearance of the copy be actuated · Allow a previous delay period. light that the plate 33 and the drum 45 is at full working temperature.

First the work of the device in making a single copy of a single original. That The original is placed in the shaft 14 and moved by the roller 36 against the switch 59. Here are the drive rollers 37 and 38 put into operation and convey the original via the switch 60 into the gap between the drum 30 and the Intermediate layer 29 * When the switch 60 is actuated, the drums 30 and 34 are set in rotation and convey the Intermediate layer 29 · At the same time, the light source 31 is supplied with current and the plate 33 is brought into contact with the intermediate layer brought. An overpressure is maintained in the drum 30. The scraper bar 39 remains in contact with the drum,

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The intermediate layer and the original are exposed by the light source 31 within the area covered by the reflector 32.If the original reaches the contact 63, a work sequence is initiated in which the feed roller 51 takes a single copy sheet from the tray 50 via the switch 64 conveyed between the feed wheat 52, 53. The copy sheet is then fed between the interlayer 29 and belt 42 by these rollers and aligned with the portion of the interlayer which has just been exposed.

When the rear edge of the copy paper on the switch 64 wanders past, a time delay sequence is initiated so that the copy sheet over the wiper rail 54 can wander out, after which a diversion on the drums 30 and 34 takes place and the intermediate layer is transported back to the point at which a later exposure takes place · At the same time the plate 33 is lifted from the intermediate layer. They drums 28 and 35 hold the section of the between these drums Intermediate layer tensioned to the same extent while the drive unit 34 measures the required lengths.

The original is taken off the drum 30 on the stripper bar 39 removed, this process being supported by the overpressure in the drum, after which the original from the roller is conveyed into the output shaft.

When the copy sheet moves past the wiper bar 54, so it is separated from the liner and from the guide plate 68 back into the gap between the belt 42 and the heating drum 45 requires, at which further heating takes place. The paper is then attached to the drum and belt Drive roller 46 is separated and passed from the guide plate 55 into the outlet shaft 21 and against the stop 56.

Following the previous work sequence, when the rear edge of the original runs over the lever arm of the switch 59, another work sequence is initiated in which the lamp 31 is switched off when the rear edge leaves the Beliöhtungszone. The short section of the liner that gets into the lighting area before the lamp goes out,

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is therefore exposed and is lost · The liner sets their movement continues as the copy paper calibrates on the squeegee 54 moved past, at which point the intermediate layer reverses its direction of movement and returned to the drum 28 until the edge of the unexposed photosensitive part is in the starting position in which it connects to the front Edge of the original * coincides with the next Copying period is introduced

Multiple copies are made from a single original in essentially the same manner as will be described below. The stripping bar 39 is initially moved into the open position, which is shown in FIG. 3, so that it represents a continuation of the channel formed by the flow plate 67, while a negative pressure is generated in the drum 30. The original is therefore held on the drum 30 and opens the contact 61, the initiation of the reversal period is prevented if the copy paper in question wanders past the switch 64. Each subsequent passage of the original beneath switch 63 initiates a copying sequence in which a sheet of copy paper is conveyed by roller 51 and rollers 52 and aligned with the exposed portion of the interlayer so that copies are made and stored in tray 21 in the slot set on counter 25 During the passage of the original for the last copy, an overpressure is generated in the orphan 30, and the stripping bar 39 is moved into the stripping section so that the original is conveyed to the exit, while the reversing device is also switched on by switch 64 after the last copy has exited tie bar 54. In this procedure, only about 1.25 cm of the interlayer is lost between exposures.

Sin further retracts, relates to the production of a single copy of a series of intermediate layers · In this Ar- _(Functioning the originals continuously sur from an input device at the shaft H roller 36 are transported, and each original is of the orphan 37, 38 conveyed to Belichtungestelle and then removed and directed to shaft 17 »whereby also

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in this case too, the distance between the rear edge of one original and the front edge of the next following original is no more than 1.25 cm. In each case , the switch-off period which is normally initiated when the preceding original leaves switch 59 is overridden by the following original actuating switch 66. When the last original is passed through, the switch 66 is deactivated so that the normal switch-off period can expire.

The device can also be programmed to produce a desired number of copies instead of a single copy is produced from each original of a number of originals, with the characteristics of the two systems described can be combined with each other.

In the device according to the invention, of course, some further features are desired and provided. The exhaustion of the The supply of the material of the intermediate layer 29 is indicated by a display means (24) which is actuated by a switch 65. A similar switch, not shown, indicates when the liner is off as a result of a malfunction of the device or off other causes is torn »Likewise, the exhaustion of the supply of copy paper can be displayed. Because copies of originals that are excessively large in length or width cannot be made a device can be provided which warns of the introduction of such originals into the device. A toggle switch 27 enables the device to be switched on and off briefly when it is supplied with new material or is to be waited with the help of the switch 26 the intensity of the light of the light source 31 can be adjusted, about the exposure on intermediate layers with different sensitivity or to adjust for originals with different densities. A fan can be provided to cool the device will. The reflector 32 is intended to absorb the heat-inducing infrared rays emit and reflect the actinic radiation to the light-sensitive intermediate layer, the infrared radiation being absorbed outside the reflector and in the form of Heat is dissipated. Furthermore, in the device are preferably 'facilities and means for precise alignment, for the Ze'it-

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environment and intended for other functions.

A feature of particular importance is the delayed development with a high copying speed can be achieved with good effectiveness. The one with that Brief contact with the plate 33 transferred heat is not sufficient in the imaging areas of the copy paper a produce noticeable darkening. Surprisingly, during the subsequent heating of the copy paper during the run the drum 45 produces a full density image around it, from which it can be seen that the reagent was completely transferred during the previous heating.

In a particular embodiment, using the commercially available interlayer material and copying paper, the plate 33 is kept at a temperature of 120 ^° C. and has a contact area with a length of 5 cm in the direction of movement of the intermediate layer. At a speed of 9 cm per second, at which the contact time is only slightly more than half a second, no visible image is produced on the copy paper. When the copying paper reaches the Bntwicklungstrommel 45, the copy paper is heated two seconds 12Q ⁰ C, and this heating is sufficient to produce an image on the copy paper with the desired blackness.

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Claims (1)

201778C - 10 - Fat ent s 8 ρ r U c h β Method for making a copy τοη a graphic Original, as differently light-proofing image and underground districts, the original being exposed is passed through the material of an intermediate layer that is desensitizable and heat-transferring duroh exposure first reagent means, and wherein the graphic original on the intermediate sheet in a Heflex sheet kept adjacent and the underground areas of the intermediate layer are desensitized, after which the intermediate layer on is heated adjacent to a copy paper, which contains a coring agent, characterized »that the heating is continued until a transfer of the first Heagenzmittel from the intermediate layer to the copy paper in the image areas is done without generating a visible image, and that afterwards the copy paper of the intermediate layer is separated and further heated, developing a visible image on the copy paper will" 2 * image developing device for carrying out the process ■■ rens according to claim I ₉ characterized by a first heating means for briefly and uniformly heating an intermediate layer on which a copy paper sheet rests, by a stripping means for separating the copy paper sheet from the intermediate layer, and by a second heating means for further and uniformly heating the copy paper sheet 3 · Copier with one exposure station, at which by. Reflection a collapsed with an original and sensitive to light Interlayer is exposed, and with a. Development station where the exposed interlayer is suaammen with one adjoining this and one coreagent containing copy paper sheet is heated 009848/1576 201778G characterized by a first heating means for briefly heating the intermediate layer and the copy paper sheet, by a stripping means for separating the intermediate layer Yam. Copy paper sheet, and by a second heating means for further heating the copy paper sheet and developing a visible image of an original 4. Copier according to claim 3, characterized in that that the exposure station has a rotatable, porous and a has an exposure drum having a smooth outside, that guide means are provided which an active portion of an elongated strip on approximately the half the circumference of said drum and over one on this Hold the original attached to the tension that a Exposure means for exposing the intermediate layer - is provided over half the circumference of the drum, and that means are provided that releasably attach the original to the drum hold firmly while the original is separated from the intermediate sheet is. . 5 «copier according to claim 4, characterized in that that said holding means generate a negative pressure inside said drum, which the original holds on to the drum, and the pressure in the drum is positive generate, in which the original is released from the drum, and that guide means are provided that the of convey original released from the drum to an output area A copier as claimed in claim 4 _S characterized by drive means which advance a strip of the intermediate layer and guide an active portion past the first heating means and said stripping means, and which thereafter retract said strip,, and convey the following adjacent portion to the location, on which this serves as an active section. 0098 46/15 76 ■ - 12 - 7 »Copier according to claim 2, characterized in that said first heating means consists of a heating plate and an adjusting device with which the heating plate (1) is brought into thermally conductive pressure contact with the intermediate layer and a sheet of copy paper and (.2) is guided out of this contact becomes ₀ 8ο copier according to claim 3, characterized in that said second heating means consists of a rotatable drum having a smooth outer surface and an endless belt which extends together with the
The intermediate layer and the copy paper sheet are moved past the first heating means and then the copy paper sheet is guided around at least half the circumference of the drum » 009846/1576