JPS6058474B2 - Device for separating electrostatically charged flexible recording material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electrostatically charged flexible recording material, such as a foil provided with a thermoplastic photoconductive layer, which is continuously advanced from a support plate between the support plate and the recording material. The present invention relates to a device for separating recording material with a wedge-shaped gap formed therein, in which recording material is guided from a supply roll to a take-up roll via a support plate.

Foils with a thermoplastic photoconductive layer are used as recording materials, for example for the production of deformed images, in particular for the recording of phase-contrast holograms.

Thermoplastic photoconductive layers are often provided on a rigid carrier, such as glass or a suitable synthetic resin, with an electrically conductive intermediate layer, for example of tin oxide or aluminum.

However, when recording at rapid screen speeds it has been found advantageous to use flexible carrier materials for the thermoplastic photoconductive layer. This makes it possible, for example, to store the recording material in a space-saving manner, for example in the form of a roll, or to easily replace the recording material by means of a film transport mechanism. Therefore, it is necessary to change the composition of the recording material as follows.

This means that a flexible carrier coated with a thermoplastic photoconductive layer is used, for example in the form of a tape. In this case, the flexible recording material can be adhered to an electrically conductive, rigid, in particular transparent, support by electrostatic forces in order to define the image plane. Embodiments are also known in which the photoconductive layer and the thermoplastic layer form two independent layers one above the other. For recording, the material is generally electrostatically charged in the dark and an image is printed.

In the case of recording materials having mutually separate photoconductive and thermoplastic layers, they are charged once more after exposure and printing. Controlled heating then transforms the charged image into a relief image. If desired, this relief image can be erased again by intense heating. It is well known to record and erase not only customary images but also holograms on such recording materials. It is well known (German Patent Application No. 1797156) to apply a pliable photoconductive foil to a carrier foil in contact with a support surface, in which a potential is established between the support surface and the conductive layer of the photoconductive foil. is generated so that both foils are attracted to each other by electrostatic forces while advancing. However, such methods present the difficulty of how to separate foils that are tightly adhered to each other by electrostatic forces. That is, it has been found that strong adhesion occurs when a potential is applied, so that separation cannot be performed easily and reliably without damaging the recording. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a device which makes it possible to quickly and reliably remove electrostatically charged recording material adhering to an electrically conductive support plate. .

To achieve this object, the configuration of the present invention includes a guide member for guiding the recording material between the winding roll and the support plate, and a recording material for preventing the recording material from being pulled back during separation of the recording material. A holding member is provided to hold the recording material immovably, and engages the recording material from the supply roll side to pull the recording material from the support plate below the support surface of the support plate under an acute separation angle with respect to the support plate. A separating mechanism is provided for pulling the recording material apart, and a holding member is provided for holding the recording material immovably to prevent the recording material from being fed out from the supply roll during separation of the recording material.

Advantageously, the wedge-shaped gap between the support plate and the recording material to be removed forms an angle of at least approximately 10 degrees. As a result, the tensile forces during detachment are kept low, so that detachment is possible with small components, without any undesirable elongation of the recording material itself. In an advantageous embodiment of the invention, the holding element for holding the recording material immovably in order to prevent it from being pulled back consists of two rollers cooperating with each other and for pulling the recording material away from the support plate. The mechanism consists of a lever mechanism that engages the recording material and a motor that drives the lever mechanism.

In a further advantageous embodiment of the invention, the pulling-off mechanism for separating the recording material from the support plate includes a roller which engages the recording material and projects below the plane of the support plate, the roller supporting the roller and extending in the direction of travel of the recording material. It consists of a movable carriage and a guide member that guides the carriage.

Next, embodiments of the present invention will be specifically described using the drawings.
In the embodiment of FIGS. 1 to 3, the recording material 4 in the form of a foil strip
holds the recording material 4 and the holding members 9 and 12 for preventing the recording material 4 from being fed out during the separation of the recording material 4 from the supply roll 5 supported by the rotatable frame members 14 to 17. Separation mechanisms 18, 19, 2 that separate from the support plate T
two rollers as holding members extending through the range of the support plate T through 0 and guided by rollers 13 as guide members to prevent the recording material 4 from being pulled back during its removal; It is guided between 22 and 23, turned by the direction changing roller 11, and reaches the take-up roll 6.

The support plate T consists of a glass support 1 which has a transparent electrically conductive layer 2 which is provided with electrodes 3 . The conductive layer 2 of S20D and Ic1t is made of, for example, tin-coated tin. The electrodes consist of a layer with a high electrical conductivity, and in the embodiment shown, for example, a gold layer is deposited. Such support plates are available on the market, for example Deu
tschen Balzers GmbH, Geisen
It is available under the name Anell® from Heim/Rheinl. The recording material 4 in the form of a foil strip consists of an electrically conductive carrier foil with a thermoplastic photoconductive layer on the outside.

The recording material 4 is fed intermittently from a supply roll 5 to a take-up roll 6. In FIG. 1, the recording material 4 is electrically charged so that it is firmly attached to the support plate T. The recording material is imaged by two coherent beams 7 and 8 intersecting each other at an angle θ. The individual components for charging and for moving the film are arranged shallowly relative to the imaging plane, so that, for example, printing is still possible at angles θ of approximately 45 degrees with respect to the normal to the surface of the support plate T; It has been found to be extremely advantageous to avoid convergence of the light beam by the necessary components. After printing, a voltage is applied to the electrode 3 for a short time, whereby the charge image on the recording material 4 is developed via the heated conductive layer 2 into a deformed image.

This deformed image, for example a phase difference hologram, is used for restoration using transmitted light or reflected light. If reflected light is used, the conductive layer 2 must not be transparent. In the customary printing of an image of directly ascertainable information, a corresponding phase-contrast image of the image is obtained as a deformed image. The deformed image can be erased again by thermal action.

Immediately after the first image or after some write/erase cycles, the corresponding section of recording material must be replaced, and for this purpose it is necessary to pull the charged recording material away from the support plate T. There is. In order to separate the recording material 4 from the support plate T, the supply roll 5 engages the recording material 4 and moves the recording material 4 from the support plate T below the support surface of the support plate T at an acute angle with respect to the support plate. A separation mechanism is provided for separation under a separation angle. In this case, the separation mechanism consists of lever mechanisms 19, 20 that engage with the recording material 4 and push the recording material 4 below the support surface of the support plate T, and a motor 18 that drives the lever mechanisms 19, 20. . Furthermore, the recording material 4 from the supply roll 5 when pushing the recording material 4 below the support plate T
In order to prevent the recording material 4 from being fed out, a holding mechanism is provided which holds the recording material 4 immovably. In this case, the retention mechanism is
Holding the supply roll 5 and supporting plate T and direction changing roller 1
1, a compression piece 21 attached to the frame member, and a roller guided in a slot of the frame member and cooperating with the compression piece 21. It consists of 9. In this case, the roller 9 is mounted on the end of the lever mechanism facing the recording material 4 and is adapted to be pressed against the pressure piece 21 by means of the lever mechanisms 19, 20. side plates 14 on both sides of the frame member;
15 and front and rear stays 16 and 17. In order to prevent the recording material 4 from being pulled back when the recording material 4 is separated, two rollers 2 are provided between the stationary roller 13 and the direction changing roller 11 to hold the recording material 4 between them.
A holding member consisting of 2, 23 is provided. By pressing the roller 9 against the pressing piece 21 via the lever mechanisms 19, 20, the recording material 4 is held immovably. At the same time, rollers 22 and 23 as holding members are pressed together and locked. Continued movement of the lever mechanisms 19, 20 in the direction of arrow 24 (FIG. 2) causes the frame members 14, 15 to
, 16, 17 are rotated and the charged recording material 4 is pulled away from the support plate T in the form of a wedge. When the lever mechanisms 19, 20 begin to move backward in the direction of arrow 25,
Recording material 4 is released from roller 9. At the same time roller 2
2 and 23 are dissociated. The direction changing roller 11 is
Coupled with rollers 26 that press only the edges, the recording material 4 is fed by one section. The fed recording material is wound onto the roll 9 with very little tension. Next, the fed recording material 4 is placed on the corona electrode 1 relative to the support plate T.
2, in which case the corona electrode is moved along the round bars 27, 28 (FIG. 3) by means of a lever mechanism (not shown). Another embodiment is shown in FIGS. 4-7.

In this case, the separating mechanism for separating the recording material 4 from the support plate T at an acute angle with respect to the support plate T extends downward from the support surface of the support plate T by about 5 to 157 r! It consists of a small roller 31 that is located at a distance of m and engages the recording material 4, and a carriage 29 that supports the roller, and a holding mechanism that prevents the recording material 4 from being fed out from the supply roll 5 during separation. The component consists of two rollers 9,10. The carriage 29 holds the corona electrode 12, is guided by round bars 27 and 28 (FIG. 7), and is capable of reciprocating movement via a lever mechanism 30. The wedge-shaped separation process of the recording material 4 involves moving the carriage 29 from the rest position shown in FIG. 4 toward the support plate T almost parallel to the support plate T as shown in FIG. 5 (forward movement). The rollers 9, 10 are pressed together and locked together in order to hold the recording material 4 immovably. A short time lag is provided at the point of reversal of the carriage from the forward movement to the return movement, during which time the rollers 9, 10 are separated from each other and the recording material 4 is advanced by one section. Then,
The carriage 29 is returned to its rest position and at the same time a new section of recording material 4 is charged by the corona electrode 12 (FIG. 6). Since the return movement of the carriage 29 and the charging of the new section of recording material 4 take place simultaneously, the working process is reduced. Advantageously, the distance between the rollers 9 and 10 and the support plate is equal to the length of the recording material to be transported, so that the pressure points do not fall within the image area. It has been found to be extremely advantageous to feed the recording material only at the rear. This ensures that surfaces within the image area are not damaged.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is a side view of the first embodiment, FIG. 2 is a side view showing the separation process of the first embodiment, and FIG. 3 is a side view of the first embodiment. FIG. 4 is a side view of the second embodiment, FIG. 5 is a side view showing the separation process of the second embodiment, and FIG. 6 is a return process of the separation mechanism of the second embodiment. The side view shown in FIG. 7 is a bottom view of the second embodiment.

Claims (1)

[Claims] 1. The electrostatically charged flexible recording material, for example a foil with a thermoplastic photoconductive layer, is pulled away from the support plate with a continuously progressing wedge-shaped gap formed between the support plate and the recording material. In an apparatus in which the recording material is guided from a supply roll to a take-up roll via a support plate, the recording material 4 is placed between the take-up roll 6 and the support plate T.
A guide member 13 for guiding the recording material 4 and holding members 22 and 23 for holding the recording material 4 immovably to prevent the recording material 4 from being pulled back while the recording material 4 is being pulled off are provided. separation mechanisms 18, 19 that engage with the material 4 and separate the recording material 4 from the support plate T below the support surface of the support plate T under an acute separation angle with respect to the support plate T;
20:29, 30, 31 and a holding member 9, 21:9, which holds the recording material 4 immovably in order to prevent the recording material 4 from being fed out from the supply roll 5 during removal of the recording material 4;
10. A device for separating an electrostatically charged flexible recording material.