DE2125125A1 - Rotary copier for photosensitive material - Google Patents

Description

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DR. ING. E. LIEBAU IWWd-Ve _{208 ή} , _μ , γ DIPING. G. LIEBAU (B "» _fcto n, »o _rt b"""" ₉ .b") 2125125

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Varo Inc.,

Garland Bank Building

Garland / Texas - USA

Rotary copier for photosensitive material

The invention relates to an apparatus for exposing a photosensitive material to light which is transmitted through a Exposure device, for example a negative, passes through. When the workpiece is exposed to light, the print image on the negative is copied onto the surface of the workpiece, as the light-sensitive material is belicntet.

Up to now, flat, sensitive workpieces have been printed in the Pnotokontaktverfanren that temporarily a permanent photo-workpiece contact was created and the combination has been exposed to ultraviolet light. The contact was established through a variety of measures, depending on whether the parts are rigid or flexible. For example, diazo paper used for

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Making blueprints is used, often exposed, while it rolls close together with its transparent template around a rotating glass cylinder, inside which tubular ultraviolet lamps are arranged. An example of such a device for a slightly different application is described in U.S. Patent 2.5-31.08 6.

In another method, the basic lichtempfindlicne workpiece and the negative are brought into exact overlap Ψ and disposed within a vacuum frame, is extracted from the air so that the parts are held together in a fixed position and in firm contact. The relative movement between the parts in contact and an ultraviolet light source causes the light-sensitive workpiece to be exposed. Such a method is used in the invention according to US patent application Ser.rio.b77.160 of November 17, 1969.

A wide variety of modifications and combinations of these methods have been developed with the aim of k to increase the versatility of copiers, to expand their performance and the accuracy of the exposure of the photosensitive material, etc. In almost all cases, the greatest degree of accuracy was achieved by holding the workpiece and negative in flat relation to one another.

Since the vacuum copier frame technology is based on the use of a workpiece with a fixed length and width is limited, it is relatively slow because of the time required to create the vacuum, and there is a risk of inadequate uniformity

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Keit Dei the creation of the vacuum, especially two-sided lighting rims, and there is also an increased risk of ninsicntlicn contamination, because with a two-sided copier more dirt can get onto four surfaces, etc.

It is generally considered desirable to eliminate this deficiency, the workpiece and the negatives to pass between two opposing rollers. In most cases, one roller is one essentially rigid material made while the opposite roller is made of a softer deformable material, so that the workpiece and aas The negative can be held firmly against the rigid roller, inside which a source of light is arranged. Unfortunately, these systems usually result in a certain deformation of the workpiece, so that the overlap difficult, if not impossible, to maintain between the workpiece and the negative can. To improve these devices, devices have been built in which the rigid roller is replaced by flat sections or fields are formed on which the workpiece and the negative are arranged. In addition to the increased Costs for the roller are again limited to such devices on workpieces that are no larger than that Fields are because it is not desirable for a workpiece to cross the intersection between two Adjacent fields extends out, as bends arise can.

In still other machines, the rollers are replaced by translucent belts in contact, between which a vacuum is created in the contact area. In terms of uniformity, these devices

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vacuum has the same shortcomings as the Yaicuum machine devices.

The invention is directed to a rotary copier for photosensitive material comprising a roller ' couple has, between which rollers a sensitive workpiece and a negative one, either on the one side of the workpiece or on its two sides for exposure of the sensitive material can be passed through. In particular, the device according to the invention has two opposite one another transparent flexible rollers for applying even pressure over an area of contact between the workpiece and the negatives. The contact area comprises a strip that is focused by the reflector Light rays is illuminated, which emanate from water-cooled tubular mercury vapor lamps, which are arranged within each of the pressure rollers.

The pressure rollers can be double-sided tubular Cylinders are formed, which dzw a rigid transparent inner wall made of plastic. have a core, which is attached to a flexible, transparent outer wall and surrounded by it. The inner wall and the outer walls are secured to one another around their periphery at their axial ends. The volume between The walls are kept under pressure by a regulated air pressure, so that the outer walls are normally be kept in contact with each other.

When a workpiece and one or more negatives are passed between the rollers, the Outer walls deformed in the area of the workpiece so that it can step between them. The temporary Deformation of the rollers has the consequence that the

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Workpiece and negative pressed into firm contact become as rigid as a vacuum-formed one Contact is.

if desired, deforming rollers can be placed around the circumference the exposure rollers are arranged nerum to generate forces that tend to increase the amount to increase the temporary deformation in the area of workpiece contact, thereby increasing the total area the pressure contact between the workpiece and the negatives assigned to it is increased.

The rollers are mounted within a housing that, if desired, can be covered with colored acrylic resin foils or Panels can be shaped to prevent stray ultraviolet rays from exiting the enclosure, however Allow the operator to view the rollers to ensure they are not through Dirt or other foreign bodies become contaminated.

Air, which is conveyed through two filtered fans, can pass through each inner wall or core of the rollers be guided along its axis in order to cool them. You can then use the outer roller walls and through the workpiece inlet and outlet openings, around the remaining heat dissipation as well as a filtered air overpressure at the workpiece inlet and outlet Achieve, whereby an additional roller circumference is prevented.

Water jackets can be placed around the light sources to absorb the infrared energy from the lamp power derive. If this doesn't happen, the infrared energy could be from the rollers and from the negatives absorbed, which creates an undesirable heat

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stretching, deformation, etc. can result. A compound can be added to the water to reduce the Increase the absorption of visible light emitted by the lamps. Although this reduces the amount of ultraviolet Light reaching the workpiece can be reduced by a very small percentage This will remove those from the dark areas of the negatives and any placed in front of the lamps Collimating devices further reduced absorbed energy.

Further objects and advantages of the invention will become apparent from the following detailed description in conjunction with the accompanying drawings showing a preferred embodiment of the invention. The invention is However, it is not restricted to this, but can be used within experience various changes to its framework.

Show it:

Fig. 1 is a side view of an inventive Copier;

Fig. 2 is a schematic representation of a side view a device of the type shown in Fig. 1, which shows details of the exposure device;

3 shows a sectional illustration on an enlarged scale parts of the rollers at their drive ends in the area where the rollers intersect;

Fig. U is a sectional view of the upper lamp unit and its holder;

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5 shows, on an enlarged scale, a partial representation of one end of the upper exposure lamp assembly and

6 is a diagrammatic representation, partially broken away, one of the pressure rollers.

The copier 11 shown in Fig. 1 for photosensitive material has a base 13, on which the operating device 15 and a copier 17 are arranged. In the copy cabinet 17 are two fans 19 are arranged, which air through filter 21 for a purpose described in more detail below support financially. There can be a Table or conveyor 23 or 25 arranged for supporting a workpiece and one or more negatives are referred to below as "workpiece sandwich" when entering and leaving the copier cabinet will.

The copy cabinet 17 shown in Fig. 2 includes an upper roller 27 and a lower roller 29 which are mutually are essentially identical with the exception of minor differences, which are described in more detail below. Basically, each roller is formed by a double-walled cylinder that is made of a rigid transparent plastic having core wall 31 and a thin flexible outer wall.

Each roller contains a cantilevered lamp support assembly 35, which faces the workpiece, so that two lamps 37 supply light to a workpiece sandwich 39 which passes between the rollers.

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A water jacket 41 can be arranged around each of the lamps 37 to conduct unwanted infrared energy generated by the lamps and a to prevent undesired heating of the workpiece sandwich. Each of the lamps is within a suitable one Reflector 4 3 arranged. Two shields 45 are attached to each reflector and it can if desired, a guide or fiber optic plate can be placed between the edges of the shields. The reflector, shields and baffle fc cooperate to limit the angle with which Ultraviolet rays can pass through the negatives to the photosensitive material on the workpiece to expose. As the maximum angle between the rays of light and one placed through the centers of the lamps Level reduced by this combination of elements becomes the amount of undercut of the print image accordingly reduced on the negatives. In other words, the closer the rays of light are to the known, when they pass through the negative, the sharper The drawing becomes each exposure.

Each of the bulb holder 35 is in cross-section essential ψ loan T-shaped and is attached to the end of the copy uefejtigt a cabinet 17 so da.u a cantilever mounting for the Lampenaggre ^ ate as shown in Fig. M- // and 5 shown Otherwise, as shown in Hg. b, j ^ nn each water jacket 41 are supplied with running water, which passes through an inlet S1 and an outlet O3, which can be connected to a suitable heat exchange system. The water has the effect of dissipating unwanted infrared energy, which in many cases accounts for more than half of the energy output of the lamps. The derivation of egg infra red energy

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prevents the workpiece sandwich from being heated undergoes distortion, expansion, etc. If desired, a suitable chemical material, for example Copper (II) sulfate or cobalt sulfate, the water added to the absorption of visible light (blue, green, yellow), which is about 30 '* the lamp energy represents to increase. Additionally or optionally, the water jacket can be made of colored glass will. Although this aid can result in a loss of the desired ultraviolet energy, will this loss can be very small, while their application greatly reduces the undesired energy radiation.

Each end of each water jacket is supported by a storage device 5 5 attached to a frame 57 by any suitable means such as screws 5 9 is attached. Each lamp 37 is bounded by two end stops 61 which is attached to the storage devices 5 5 by any suitable means, such as screws 63 can be. Power is supplied to the lamps via two lines 65.

At each end of the frame 57 there are two wing supports 67 provided so that the Lampena & gregat on a lamp holder aging 6 9 can be adjusted by any suitable means, such as screws 71. The bearings 6 9 are in turn attached to the lamp holder 35 by any suitable means, such as screws 73. As is evident from Fig. 2, the lamp support assemblies identical, but reversed, so that both lamps face the Werkabücksandwich.

From Fig. 3 and 6 and in particular from Fig. 3 it can be seen that the core walls 31 with each of the rollers inner grooves 81 are formed into which divided

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Retaining rings 83 can be used. Clamping rings 85 attached to the split rings 8 3 by any suitable Means, such as screws 87, can be attached, are used to attach the axial ends of the outer Wall 33 against sealing rings 89 which are arranged between the ends of the core walls 31 and the clamping rings. In this way, the volume between each core wall and the associated outer wall is sealed in order to Prevent air leakage.

-Valzenaggregaten between the bearing 91 and bearing housing 93 W are arranged, which are suitably mounted on the copying cabinet 17th

A pinion 95 driven by a suitable power source (not shown) can be used to drive a gear 97 that is associated with the clamping ring 95 is molded in one piece · The upper roller can be driven by frictional contact with the lower roller or there may be a similar gear 99 as part of the upper clamp ring 85 for engagement with the gear 97 are provided.

k As shown in FIG. 4, each of the lamp holders 35 carries also a compressed air transfer block 113 with a channel 115 and with an inlet 117 and an outlet 119. A hose 121, which is connected to a suitable pressure source (no shown) is connected.

A rotatable fitting 123 which is inserted into the outlet 119 is attached to a hose 125, which is attached to a suitable fitting 127 (Figs. 5 and 6) at its opposite end. That

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The connector 127 is in turn attached to a tube 129 or the like, the press fit in a connector block 131 which is fixed to the inner wall of the core 31 by suitable means such as screws 133. A Channel 135 within block 131 is with fitting 127 and the volume between the walls 31 and 33 through an opening 137 in the core wall 31 in connection. In this way a print can be made between the walls of the roll are maintained so that the negatives 139 (FIG. 3) can be held firmly against the workpiece 141 of the workpiece sandwich 39.

As can also be seen from FIG. 2, a number Deforming rollers 14 3 around the circumference of the outer walls 33 each of the rollers can be arranged to provide a greater area of contact between the rollers and the workpiece sandwich 39 to create.

In addition, as shown in FIG. 2, if necessary the workpiece tables 2 3 and 25 are replaced by conveyors 147 and 14 9 in order to handle the workpiece sandwich to perform.

When air in the copier cabinet 17 by the blower 19 is sucked in, it is conveyed through filter 21, and then driven through the interior of the inner cores 31. When the air hits the opposite ends of the rollers reached, it is deflected, go aaYes it flows over the outer walls of the folds., whereupon it comes out of the Copy cabinet through the work piece Iila.a and -auslacöffnungen is derived, as shown in FIG. In this way the rollers are made using the Filtered air is cooled and becomes an impurity the rollers excluded because the bunk cabinet 17 through

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the fan 19 is kept under pressure. This prevents dirt and other foreign bodies from getting into the Cabinet and there can even be the workpiece sandwich 39 undergo an air purge as it passes through the inlet. To further remove incoming Dust particles from added sandwicnes can be so-called air brushes or brushes or anti-static Devices 40 are arranged at the locations shown in FIG.

w 'If gewünsent, the copying unit 17 may have window of colored acrylic resin film that prevent ultraviolet rays from leaking out of the device, the operator jedocn observation of the rolls during the BetrieDS allow to ensure further that no pollution, through which the " Work piece sandwich, impacting light rays could occur.

The invention therefore provides a new and improved apparatus for exposing photosensitive Material created that represents a real advance over the prior art. The invention is of course not limited to the illustrated and described embodiments, but can within experience various changes to its framework.

Claims;

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Claims (1)

Patent claims 'lJ copier for photosensitive material, marked by an underframe (13), two rollers (27, 29) which are in close proximity to each other in the Underframes (13) are mounted between them for the passage of a light-sensitive material, wherein at least one of these rollers has a core wall (31) made of a relatively rigid translucent Material and an outer wall (33) made of a relatively deformable translucent material further comprises means (8 9) for sealing the ends of the core wall (31) with the ends of the outer wall (33) and a device (19) for generating a pressure between the core wall and the outer wall. 2. Apparatus according to claim 1, characterized by a device for exposing a photosensitive material, which passes between the pair of rollers (27, 29), with ultraviolet light in the form of a lamp (37) and means <· 35) for holding the lamp inside at least the mentioned one roller radially inside from the core wall (31). 3. Apparatus according to claim 2, characterized in that the exposure device has means (43, 45, 47), 109849/1322 which are arranged in relation to the lamp (37), that they determine the angle with which ultraviolet light rays the light-sensitive workpiece, that passes between the rollers, pressurize, 4. Device according to claim 2, characterized by a Device for the absorption of the lamp (37) produced infrared rays. 5, device according to claim 4, characterized in that the means for absorbing the infrared rays is formed by a water jacket (41) which is around the lamp (37) is arranged around it, and a flow channel (51, 53) in the water jacket for passing therethrough of water through the water jacket. 6. Apparatus according to claim 2, characterized by a device for absorbing the visible light rays generated by the lamp (37). Apparatus according to claim 6, characterized in that the means for absorbing said visible Light rays through a water jacket (Hl) is formed, which is arranged above the lamp (37) is, further by means (51, 53) for passing water through the water jacket and means in the water passing through the water jacket to absorb the visible light rays. 109849/1322 Apparatus according to claim 7, gekennzeicnnet characterized in that the means ⁽¹ H) passing water to be formed by a chemical substance in the through the water jacket, the visible light beams can absorb, while the most of the ultraviolet light rays produced by the lamp (37) lets pass through. Device according to claim 6, characterized in that the means for absorbing the mentioned visible Lieut beam η has a Viassermantel (41), which is arranged around the lamp (37) and with a colored glass to absorb visible light rays is provided, and means (51), (53) for passing water through the water jacket. 10. Apparatus according to claim 1, characterized in that the Druckzeugungseinricntung an air conveyor system and means associated with the air delivery system and with the volume between the core wall (31) and the Has outer wall (33) for the entry of air into the aforementioned volume. 11. Apparatus according to claim 1, characterized in that the pressure generating device has at least one deformation roller (1 ** 3) in contact with the mentioned outer wall (33) to a part of this outer wall to deform radially. 109849/1322 12. Apparatus according to Ansprucn 1, characterized by a device for cooling at least one of the rollers, has the means for guiding air through the core wall (31) and over the outer wall (33). 13. Apparatus according to claim 12, characterized by means (21) for filtering the cooling air and a device on the underframe (13) through which the Lindringen of impurities in the area around the rollers nerum is prevented by an inevitable Air flow is generated from the inside away. 14. Apparatus according to claim 1, characterized in that both rollers (27, 29) have a core wall (31) and an outer wall (33), and each is provided with a lamp (37) which is inside the "core wall inside the roller is arranged, and with means (43, 45, 47) by means of which ultraviolet rays generated by the lamps are directed in opposite directions ψ essentially along a plane, which intersects the axes of the lamps and a workpiece that passes between the rollers. 10 9 8 4 9/1322