EP0533622A1 - Dispositif pour le développement simple face d'un matériel photosensible sous forme de feuille ou de bande - Google Patents

Dispositif pour le développement simple face d'un matériel photosensible sous forme de feuille ou de bande Download PDF

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Publication number
EP0533622A1
EP0533622A1 EP92810662A EP92810662A EP0533622A1 EP 0533622 A1 EP0533622 A1 EP 0533622A1 EP 92810662 A EP92810662 A EP 92810662A EP 92810662 A EP92810662 A EP 92810662A EP 0533622 A1 EP0533622 A1 EP 0533622A1
Authority
EP
European Patent Office
Prior art keywords
roller
knobs
pressure
developed
permanently elastic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP92810662A
Other languages
German (de)
English (en)
Inventor
Paul Heinzer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Multitec AG
Original Assignee
Multitec AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Multitec AG filed Critical Multitec AG
Publication of EP0533622A1 publication Critical patent/EP0533622A1/fr
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
    • G03G15/101—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer for wetting the recording material
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D5/00—Liquid processing apparatus in which no immersion is effected; Washing apparatus in which no immersion is effected
    • G03D5/06—Applicator pads, rollers or strips
    • G03D5/067—Rollers

Definitions

  • the present invention relates to a device for the one-sided development of light-sensitive sheet or strip material in accordance with the preamble of patent claim 1.
  • a similar device is schematically shown and described in the German published patent application DE 26 00 155. It contains a metering roller made of a metallic core, which is surrounded by a plastic sleeve. The sleeve is provided with fine, helical grooves. The metering roller transfers developer liquid to an applicator roller, which consists of a metallic core and a smooth rubber sleeve.
  • a profile roller which comprises a metal core and a sleeve made of profiled rings lined up in a row, presses against the application roller. Each of the profiled rings has n-times repeating, outwardly projecting profiles, preferably pyramid-shaped tips, distributed uniformly over the circumference on the outer circumferential surface. Two adjacent rings are rotated by a certain angle.
  • the aim is to ensure that the diazo paper to be developed is pressed evenly onto the applicator roller, the surface of the profile roller during The absence of copy material should remain as dry as possible so that moistening of the back of a copy to be developed can be avoided.
  • German patent application DE 27 46 749 refers to difficulties that arise with the aforementioned profile roller.
  • very wide copiers which are usually used for the production of diazo copies
  • the forces acting on the copy to be developed are not uniform over the entire length of the gap between the application roller and the profile roller.
  • Even small differences in the amount of developer liquid applied to the diazo layer cause quite large differences in color intensity in the developed copy.
  • Well-developed jobs alternate with underdeveloped or poorly developed jobs.
  • Each sub-roller is assigned a spring element which is intended for pressing the sub-roller onto the applicator roller.
  • a disadvantage of this second-mentioned device is the relatively complex and expensive construction and the fact that there are gaps between the individual partial rollers where the spring elements engage, in which there is no pressure on the copy material to be developed on the application roller. Streaking on the developed copy is possible.
  • knobs result in an additional tightening of the material to be developed when it is pressed onto the application roller.
  • Knobs of the profile roller which are adjacent in the circumferential direction have the tendency to spread apart, the region of the material to be developed lying between these knobs being tightened.
  • the permanently elastic, relatively soft knobs ensure that the material to be developed is evenly pressed against the pressure roller, even with very wide diazo copying machines. An inevitable slight sagging of the individual rollers no longer has a disadvantageous effect. It is therefore not necessary to build up the profile roller from individual partial rollers.
  • the construction is particularly advantageous when the covering of the permanently elastic material is formed from sleeves which are pushed onto the core and are lined up and when water-repellent silicone rubber has been selected as the material.
  • the effect of the latter additionally helps prevent the moistening of the side of the material to be developed which is remote from the applicator roller.
  • the material to be developed can be moved relatively easily at the point of contact between the profile roller and the application roller.
  • shifting at this point in a certain area of the material to be developed results in an uneven application of the developer liquid and consequently in an uneven color intensity of the diazo layer of the copy.
  • the surprisingly found possibility of easily moving the material to be developed has been used in a further embodiment of the device for aligning the former as follows.
  • the contact point between the profile roller and the application roller has been preceded by a pressure element which, together with the profile roller, forms a further contact point.
  • This is intended in particular for the feeding and transport of the material to be developed to be developed.
  • Straight alignment of the latter is easily possible. If this happens before the material to be copied has reached the point of contact between the profile roller and the application roller, the quality of the copy is not impaired.
  • This alignment option is a significant advantage, particularly in the case of web-shaped material, such as continuous paper.
  • the diazo copying machine partially shown in FIGS. 1 and 2 essentially comprises the following components.
  • 1 denotes an exposure unit which has an exposure drum 2, which usually consists of a transparent glass tube in which luminous elements are arranged.
  • Circulating conveyor belts 3, which are deflected several times via deflection rollers 4, ensure that a drawing template is guided around the exposure drum together with a sheet-like or strip-like material which is provided on one side with a light-sensitive layer, for example a diazo layer.
  • the diazo layer is exposed during this process.
  • Pinch rollers marked with 5 ensure a flawless feed and a flawless output of the copied material fed to the exposure unit.
  • the exposed material must now be provided with a developer liquid layer on the layer side in order to make the unexposed areas of the diazo layer visible.
  • the developing device 6 consists of a circumferentially driven metering roller 7, which usually has a metallic core on which a plastic sleeve 8 is arranged, which has an extremely fine, helical groove is provided.
  • the developer liquid can be supplied to the metering roller 7, for example, by a spray system not shown in this figure. Too much sprayed-on developer liquid drips off into a collecting channel 9, from which a return line, also not shown, is led into a reservoir which contains the developer liquid.
  • the metering roller 7 transfers the developer liquid to an applicator roller 10. The latter has a smooth outer surface.
  • the applicator roller can also comprise a metallic core on which a rubber sleeve with a smooth outer surface is arranged.
  • a profile roller designated by reference numeral 11 This is made of a cylindrical core 12, preferably of a metallic material, the outer surface of which is completely covered with a covering 13 made of a permanently elastic material.
  • the surface of the covering 13 facing away from the core is provided with radially protruding and staggered, essentially conical or pyramidal knobs 14. These consist of the same permanently elastic material as the covering 13.
  • the knobs 14 have a height of approximately 1 to 1.5 mm.
  • the knot density is preferably 5 to 15 knobs per cm2.
  • the ratio of the nub height to the diameter of the base area is approximately 1 to 3.
  • the nubs 14 are preferably arranged offset from one another such that, viewed in the axial direction of the profile roller 11, no rows of nubs are visible.
  • the offset of the knobs 14 is advantageously selected in such a way that rows of knobs 16 running in the form of a helical path are present on the outer surface of the covering.
  • Materials are suitable for producing the permanently elastic covering, such as elastomers, rubber or rubber. Silicone rubber has a particularly advantageous effect. This material is water-repellent. Since the development process should ensure that the side of the material to be developed facing away from the application roller is not wetted, it must be ensured that the profile roller does not absorb any developer liquid if there is no material to be developed between the application roller 10 and the profile roller 11 located. This is achieved on the one hand by the presence of the knobs and on the other hand is additionally supported by the use of silicone rubber.
  • the covering 13 and the knobs 14 are relatively soft.
  • the hardness of the permanently elastic material used should be in a range from 20 to 70 Shore A, preferably between 30 to 40 Shore A.
  • the profile roller can be built particularly simply and inexpensively if 12 sleeves 15, which have been made of the permanently elastic material, for example in an injection molding process, are pushed together in a row on the cylindrical core.
  • the contact pressure of the profile roller 11 on the application roller 10 is small. Surprisingly, it has been found that, as a result of the small contact pressure and the elastic knobs 14, a material to be developed, which is located between the profile roller and the application roller, can be easily moved or aligned. Although shifting at the point just mentioned is not recommended because this results in unevenness in the color intensity of the diazo copy layer of the developed copy, this knowledge has been used, however, in the developing device 6, a pressure element, in this case a pressure roller 17 to be arranged in such a way that it forms a first contact point 19 with the profile roller 11, which is arranged in the direction in which the material to be developed passes through the developing device 6 before a second contact point 20 of the application roller 10 with the profile roller 11.
  • Guide means 22, 23 and 24 are intended for the correct feeding of the copy to be developed to the application roller 10.
  • a baffle plate designated by 22, essentially curved in the shape of a circular arc and extending approximately over the entire length of the profile roller 11, is intended to deflect the copy material leaving the first contact point 19 and to feed it to the second contact point 20 of the profile roller with the application roller.
  • the pressure roller 17 automatically feeds and transports the material to be developed even before it is in contact with the application roller. This makes it possible to shift the material to be developed inserted between an upper guide plate 23 and a lower guide plate 24 or to align it in a straight line before it comes into contact with the moist surface of the application roller 10. This option is an important advantage, especially with large sheets or with web-like material.
  • the metering roller 7 is mounted on the side cheeks of a machine frame with first bearing journals 30.
  • groove-shaped guide tracks 28 are present on the right and left in the machine frame, in which the application roller 10 is held displaceably along the track 28 by means of second bearing pins 31, the profile roller 11 by means of third bearing pins 32 and the pressure roller 17 by means of fourth bearing pins 33.
  • the contact pressure between the upper roller and the lower roller is essentially determined by the weight of the roller in question and the weight of the rollers above. It is envisaged to make the contact pressure of the pressure roller 17 on the profile roller 11 adjustable by means of pressure setting means 26, which are only shown symbolically in FIG. 2 as a compression spring with variable force.
  • the pressure roller 17 advantageously also has a metallic core, on which disks 21, for example made of rubber, with a smooth outer surface are pushed in a known manner.
  • the disks 21 can either be lined up, as shown in FIG. 2 on the left side, or they can also be arranged at a distance from one another. This is indicated by dash-dotted lines on the right in FIG. 2.
  • FIG. 3 the second point of contact of the profile roller 11 with the applicator roller 10 is shown enlarged.
  • a material to be developed, designated 34, is located between the two rolls mentioned.
  • the soft, conical or pyramid-shaped knobs 14 stand on the side of the soft covering 13 facing away from the core 12 in the radial direction from the profile roller 11 onwards. Knobs which are arranged adjacent to one another in the circumferential direction and come into contact with the material 14 to be developed in the region of the application roller 10 experience a spreading apart of the tips when the material passes through, as is shown in FIG. 3 by both knobs designated 35 and in particular 37 is indicated. The direction of pivoting of these nubs is illustrated by arrows 36 and 38, respectively. On the material 34 to be developed, this giving away or spreading apart has a tightening effect in the area designated by the reference number 39. A particularly even contact of the material 34 to be developed with the application roller 10 is thereby ensured. The consequence of this is an increased uniformity of the application of the developer liquid to the material to be developed.
  • FIG. 4 shows a further embodiment of a development device 6 according to the invention. It differs from the exemplary embodiment described above only in that the pressure roller has been replaced by a tongue-shaped pressure plate 18. This is pivotally mounted about the pivot axis 25.
  • the contact pressure of the pressure plate on the profile roller 11 can be set by means of pressure setting means 27.
  • the latter and the applicator roller 10 are mounted displaceably in lateral guideways 29, similar to the example described above.
  • the pressure setting means 27 With the pressure setting means 27, the contact pressure of the pressure plate 28 on the profile roller 11, the contact pressure of the latter on the application roller 10 and the contact pressure of the latter on the metering roller 7 can also be adjusted, as has already been described above.
  • the pressure plate 18, which consists of several partial plates arranged side by side can also take on the task of the upper feed plate 23 present in the previous exemplary embodiment.
  • the development facilities described according to the invention are extremely simple.
  • the quality of the copies made is unique thanks to the even pressure of the material to be developed on the applicator roller.
  • the sleeves of the profile roller made of silicone with the soft knobs are water-repellent. This further reduces wetting of the back of the material to be developed. Due to the soft knobs and the relatively weak pressure of the pressure element on the profile roller, inserted sheets can be easily moved and straightened before they come into contact with developer liquid. In the area of the contact point between the profile roller and the application roller, spreading apart adjacent knobs creates an additional tightening of the material to be developed in the area of these knobs.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photographic Developing Apparatuses (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
  • Wet Developing In Electrophotography (AREA)
EP92810662A 1991-09-20 1992-08-28 Dispositif pour le développement simple face d'un matériel photosensible sous forme de feuille ou de bande Ceased EP0533622A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2795/91 1991-09-20
CH279591 1991-09-20

Publications (1)

Publication Number Publication Date
EP0533622A1 true EP0533622A1 (fr) 1993-03-24

Family

ID=4241756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92810662A Ceased EP0533622A1 (fr) 1991-09-20 1992-08-28 Dispositif pour le développement simple face d'un matériel photosensible sous forme de feuille ou de bande

Country Status (3)

Country Link
US (1) US5311234A (fr)
EP (1) EP0533622A1 (fr)
JP (1) JPH05204118A (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE641146C (de) * 1937-01-21 Renker & Belipa G M B H Vorrichtung zur Entwicklung von Lichtpausen
US3874331A (en) * 1971-01-18 1975-04-01 Gaf Corp Apparatus for applying liquid to a web
US4068620A (en) * 1975-01-13 1978-01-17 Oce-Van Der Grinten N.V. Profiled roller

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1381328A (en) * 1972-10-16 1975-01-22 Gaf Corp Liquid applying means
JPS5033661A (fr) * 1973-07-30 1975-03-31
NL7611988A (nl) * 1976-10-29 1978-05-03 Oce Van Der Grinten Nv Aandrukrol.
JPS6370255A (ja) * 1986-09-11 1988-03-30 Fuji Photo Film Co Ltd 加圧画像形成装置
JPS6443706U (fr) * 1987-09-10 1989-03-15

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE641146C (de) * 1937-01-21 Renker & Belipa G M B H Vorrichtung zur Entwicklung von Lichtpausen
US3874331A (en) * 1971-01-18 1975-04-01 Gaf Corp Apparatus for applying liquid to a web
US4068620A (en) * 1975-01-13 1978-01-17 Oce-Van Der Grinten N.V. Profiled roller

Also Published As

Publication number Publication date
JPH05204118A (ja) 1993-08-13
US5311234A (en) 1994-05-10

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