SU817658A1 - Electrophotographic composing-and-printing machine - Google Patents

Description

which is not always convenient for rio reasons for reducing the efficiency of obtaining a set of print runs and increasing the required equipment range. Along with this, the requirements for the quality of the prints are imposed, since in the process of reproduction they serve as the original.

The purpose of the invention is the expansion of technological capabilities by providing multiple reproduction of the image when it is recorded once.

This goal is achieved by the fact that the charging device has image carriers located along the rotation and after the cleaning device there are three charging devices, the first of which is equipped with an additional illumination lamp, while the charging unit is located after the charging device, and image exposure is placed between the second and third charges, and the image transfer device contains a shaft with a two-layer elastic coating, the top layer of which is made of an insulating, and the lower one is made of conductive material. The machine has a control unit for recording and reproducing modes of the image.

FIG. 1 shows the scheme of the proposed device; in FIG. 2 a section DD in FIG. one; in fig. 3 is a diagram of a font carrier with mechanisms for scanning characters into a string and changing pin sizes; in fig. 4 shows a section B-B in FIG. 3; in fig. 5 is a section of YYD in FIG. 3; in fig. b - structural control scheme

The Electrophotographic Machine Part contains a cylinder 1 with a two-layer photoreceptor, a photoconductor-dielectric driven by a stepping motor 2 (Fig. 3), a charger 3 (Fig. 1) with a lamp 4, a charger 5, a charger b, a lamp 7, pro The vacuum device 8, the image transfer device in the form of a shaft 9 with a two-layer elastic coating from the lower current conducting T and upper insulating AND layers, a paper transfer system containing a paper roll 10, a guide 11 and a tension 12 rollers, output rollers 13, rotatable electrodes by a harness 14 (FIG. 2) through a belt drive 15 and a friction clutch 16, a receiving tray 17 (FIG. 1), a device for cutting finished prints made in the form of a fixed knife 18 and a movable knife 19, a device for fixing the image in the form of emitters 20 with a block control, a heated plate 21, a cylinder cleaning device consisting of

rotating fur roller 22 with a 23 otsos air system.

A font carrier 24 (FIG. 3), made in the form of a dark film with transparent images of characters of various headsets, arranged, for example, in two rows, is placed on a disk 25 held in continuous rotation by an electric motor 26 (FIG. 4) through a belt drive 27

Q and shaft 28. A lamp 29 (Fig. 3) with a condenser 30 serves to illuminate the signs.

Claims (2)

I When changing a headset, the disk 25 can move along shaft 28 (fig. 4) under the action of a cam 31 fixed on the same shaft with the Maltese cross 32, interacting with the carrier 33 rotated by the electric motor 34 through a worm gear 35 .; Kinematic closure of the roller 36, closely 0. Associated with the font carrier 24, carries the spring 37. The optical unit consists of interchangeable lenses 38 (Fig. 3;) placed on the turret 39, and installed 5 on the carriage 40. The lens 41, and. mirror. la 42. ZZ and 41 lenses are collimation, sysz; The motor 43 is used to rotate the turret 39 when changing the pin, and the stepper motor 44 (FIG. 5) connected to the rack and pinion carriage 40 is used to move the carriage 40 along the generator of the cylinder 1 when the line is being scanned. The carriage 40 thus moves along the guides 45 and 46. The control circuit (Fig; b) contains a computing unit 47 two electric pulse generators 48 and 49 with two keys 50 and 51, a block 0 52 flash lamp control, thermal emitter control unit 53, main unit control unit 54 of the electrophotographic part of the charging machine, developing, lying nose, securing, cleaning, cutting finished prints. The machine works as follows. In the image recording mode, cylinder 1 (Fig. 1), by commands of the computing unit 47, performs line-by-line displacements by the interline value in the direction indicated by the arrow, using stepper motor 2 (Fig. 3). When voltage is applied to the charge 3 (Fig. 1) and the photoconductor is simultaneously illuminated by lamp 4, the charge is deposited on the dielectric surface of the cylinder 1. At the same time, the screened 0 charge due to low resistance. Neither the photoconductor is located at its interface with the dielectric. Upon further movement of the cylinder to the surface, the dielectric in the absence of light is deposited charge polarities opposite the first stage using charge days1. Due to the large dark resistance of the photoconductor, the screened charge after the secondary charge is located at the interface between the photoconductor and the substrate. Each line of text is formed on the surface of a cylinder 1 with a rotating font carrier 24 (Fig. .3) during cylinder stage 1 during movement along its forming carriage. 40 and the ignition of the flash lamp 29 according to the instructions of the computing unit 47 (Fig. 6). Upon further rotation of the cylinder 1 (Fig. 1), the dielectric surface is grounded through a charger 6, the corona wire of which is connected to an AC power source and its grid is grounded . In this case, as a result of the redistribution of charges on the surface of the dielectric, a relief on charge arises with the same potential on the c-wind and dark areas of the image. After the cylinder rotates, the charge relief on the dielectric turns into potential as a result of the photoconductor's total illumination by lamp 7 through a transparent dielectric. After all the operations, a latent image appears in the form of a potential relief on the surface of the dielectric, and all screened charges on light and dark parts of the image located at the interface of the photoconductor and the dielectric Due to the high resistance of the dielectric, much higher than the dark resistance of the photoconductor, Agen thereon can be stored for a long time both in the light and in the dark, and as will be shown below, the developability and repeatedly transferred to receptive material. An important feature of the machine used in the formation of the latent image on a two-layer photoreceptor should be considered the separation in time of the exposure of the image and grounding of the surface-dielectric, allowing the use of both continuous and pulsed light sources with extremely short light pulse. It is experimentally shown that an image is formed at very short light pulse durations, less than c, After filling the entire (or part) of the surface of the cylinder 1 as a latent image on koco. Mandy of the computational unit 47 (Fig. 6) of the mini-gun is switched to the image reproduction modes. At. By the commands of the block 54, the stepping motor 2 (Fig. 3), the drive of the cylinder 1 is transferred to the continuous rotation mode by applying pulses of a constant frequency to it, pre-. The supply of voltage to the ports 3, 5 and b and the supply of information to the surface of cylinder i increase (Fig. 1). The elevator of the drilling device 8 begins to rotate and feeds the developer to the surface of the cylinder 1, the shaft 9 is supplied to the cylinder 1 and to its conductive 0, a layer T is supplied. The voltage also turns on the motor 14 (FIG. 2) of the paper wiring. By command block 53 (FIG. B) the emitters 20 are lit (FIG. 1) and go into operation. 5 device for cutting finished prints In the process of rotation of the cylinder 1. the image on it in each cycle appears, is transferred onto a paper tape and the printouts on the tape are fixed by melting the powder with thermal emitters. The finished prints are then cut off with knives 18 and -19 and output by the rollers 13 into the receiving tray 17. five Multiple image reproduction is provided in the car due to the long-term preservation of the potential relief on the dielectric coating of cylinder 1 and the method of transfer by means of shaft 9, creating an electric field in the powder image without depositing true charges on the surface of the electric coating of cylinder 1. This is facilitated by an insulating coating 5 and shaft 9, which due to its large resistance provides almost zero current in the transfer zone and high-quality image transfer by means of 0; alignment of the electric field in the powder layer over the entire contact zone of cylinders 1 and 9, even with defects in the coating, cylinder 1 and. paper. lio experimental data 5 transfer method provides from 10 to 50 prints with one-fold; but the recorded latent image when changing the voltage on the conductor clamp of the shaft T of the shaft 9 in the range of 4-2 kV .. In the process of reproducing the image at the moment when the beginning of the image on the cylinder 1 of the last print of the specified circulation hits 5 to zone A (Fig. 1) at the command of the unit 54 (Fig. 6), the fur roller 22 (Fig. 1) is brought to the cylinder 1 and cleans its surface from powder residues for 1-2 cylinder turns, 0 and then the roller is retracted to its original position. In the process of cleaning the cylinder, if necessary, the corona wire of the charger 3 can be energized from the AC power source, and the grid Charge 5 is grounded that, in the presence of photoconductor illumination (included (amp 4), contributes to the most complete erasure of the latent image. However, as shown by experiments, with good properties of a two-layer photoreceptor (no volume charge in the photoconductor), this operation is not required. After receiving a given print run of prints, the machine, following the instructions of block 47 (fig. 6), again switches to the image recording mode and then creates a latent image of the next galley of text. prints (without reproduction), the machine can operate in recording and reproducing modes simultaneously. At that, the cylinder (Fig. 1) makes interline movements all the time, the fur shaft 22 is constantly led to cylinder 1, the unit 53 turns on the thermal radiators periodically for a predetermined interval the time after advancement of the preheated on the plate 21 (fig. of the paper tape for a predetermined distance) and the device for cutting the finished prints can be turned off. Formula, invention. 1, A two-part electrophotographic typesetting machine, one of which contains a font carrier with a flash lamp and a headset changing mechanism, a flash lamp control unit and an optical exposure block with mechanisms for scanning characters into a line and changing size of characters, and the second is image carrier and charging device installed along its rotation. an illumination lamp, an imaging device, an image transfer, a carrier cleaning, as well as a fixing device with a control unit and a computing unit, are essentially connected with the font carrier, the optical imaging unit and the pulse lamp control units, and that, in order to expand the technological capabilities by providing multiple reproduction of the image when it is recorded once, the charging device has three charges sequentially Following the cleaning device during the rotation of the image carrier, the first of which is equipped with an additional illumination lamp mounted above it, the mechanism for scanning characters into the row of the optical exposure unit is placed between the second and third charges, and the transfer device contains a shaft with a two-layer elastic coating , the upper of which is made of insulating, and the lower one of conductive material, 2. The machine according to claim 1, in that it additionally has a control unit for recording and reproducing modes of the image, the input of which is connected to the computing unit, and the outputs are connected with. a charging device, image display and transfer devices, an image carrier cleaning device, a paper guiding mechanism and a fixing control unit. Sources of information taken into account in examination 1, USSR Author's Certificate for Application No. 2504134, 06.07,77. / 77777 IS NC / S IS / N / 1 W