Patents Assigned to Gretag Systems
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Patent number: 5284305Abstract: The cassette comprises two pivotable guide members (6,7) which guide the photographic strip material (B) round a hollow cylindrical guide sleeve (5) which can be slipped onto a rotatably mounted, drivable winding core (4) and, on being slipped onto that winding core, locks into its operating position.Type: GrantFiled: June 28, 1991Date of Patent: February 8, 1994Assignee: Gretag Systems, Inc.Inventors: Werner Gassmann, Albert Dunner, Erich G. Binder
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Patent number: 5237359Abstract: A storage for strip material is provided with an inlet for the strip material into the internal space of the housing and an outlet from the internal space of the housing. Inside the housing, holding means are provided which accumulate the strip material above the holding means where the weight of the strip material is less than a threshold value, and which release the strip material downward if the weight of the strip material exceeds the threshold value.Type: GrantFiled: June 10, 1992Date of Patent: August 17, 1993Assignee: Gretag Systems, Inc.Inventors: Roman Rosenberg, Heiner Schaub
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Patent number: 5187520Abstract: A photographic copy apparatus for processing of photographic copy material housed in mobile cassettes, at least two cassettes being combined on either side of an exposure station in a block so that the cassettes on an inlet side are approximately opposite cassette openings of cassettes on an outlet side. The cassette openings of the cassettes in their working position are aligned with the transport path for the copy material and additional cassettes behind those in their working position are aligned with a parallel to the transport path. Transport devices are provided above the cassettes combined in blocks for their exchange.Type: GrantFiled: June 16, 1992Date of Patent: February 16, 1993Assignee: Gretag Systems, Inc.Inventors: Kurt Muller, Roberto Rupp
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Patent number: 5164765Abstract: The copying light of a source of copying light is attenuated in areas using a mask with different density ranges to influence the density by areas of a copy to be produced from a copy master. The appropriate area of the mask is selected by analyzing a location dependent density variation of the mask stored in matrix form in a computing and evaluating unit by predetermined criteria. A photographic copying apparatus associated with the process includes an exposure station with a mask mounted on a slide. The slide may be displaced in response to control signals determined and generated in the computing and evaluating unit. The slide is displaced in a plane parallel to a transport plane of the copy master in the beam path of a source of copying light.Type: GrantFiled: August 16, 1991Date of Patent: November 17, 1992Assignee: Gretag Systems, Inc.Inventors: Christa Strobel, Rolf Bronnimann
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Patent number: 5119125Abstract: In a photographic copy process the copy master is scanned in intervals by a source of measuring light. The measuring light is spectrally split, detected and converted into electrical measuring signals. The n spectral measuring signals are converted into n spectral density values, compared with neutral densities and n spectral density differences formed. In a data compression the n spectral density differences are converted by an orthogonal transformation to m<n transformation coefficients. The transformation coefficients are analyzed in a color and density correction routine and deviations computed. From the deviations the copy light quantities and exposure corrections adjusted to the copy material are determined. The photographic copies are produced by the exposure values determined.Type: GrantFiled: September 5, 1991Date of Patent: June 2, 1992Assignee: Gretag Systems, Inc.Inventor: Walter Kraft
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Patent number: 5115270Abstract: A photographic color copying apparatus and an exposure control process includes measuring filters variable as a function of the spectral sensitivities of different copy materials, in particular electro-optical filters. The variable measuring filters are constructed in the manner of Solc filters or Lyot-Ohman filters and include polarizers and electro-optical crystals, preferably liquid crystals.Type: GrantFiled: September 28, 1990Date of Patent: May 19, 1992Assignee: Gretag SystemsInventors: Walter Kraft, Jurgen Nehring
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Patent number: 5109251Abstract: The copy master is illuminated in scanning sections located along scanning lines and measuring light coming from the scanning sections of a scanning line is spectrally decomposed and subsequently passed onto a photoreceiver line coordinated with the scanning line involved. Along this photoreceiver line photoreceiver groups sequentially follow each other, each group being assigned to the spectrum of a scanning section of the scanning line involved.Type: GrantFiled: December 5, 1990Date of Patent: April 28, 1992Assignee: Gretag Systems, Inc.Inventors: Rolf Bronnimann, Harald Maxeiner
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Patent number: 5087937Abstract: The light emitted by a source of light is passed by means of optical fibers or bundles of optical fibers in lines over a master to be scanned. In the process, an orifice of a disk rotated by a motor sequentially projects the light onto one optical fiber or bundle of fibers leading to the master. The light exiting from the light emitting end of the optical fiber or bundle of optical fiber illuminates the master. On the other side of the master a corresponding optical fiber or bundle of fibers receives the light coming from the master and conducts it to a receiver.Type: GrantFiled: September 7, 1990Date of Patent: February 11, 1992Assignee: Gretag SystemsInventors: Beat Frick, Walter Kraft, Karl Ursprung
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Patent number: 5081486Abstract: Process wherein the slope of linear segments of color density curves of color copy material are affected in a controlled manner by homogeneous supplemental exposures. The quantities of light required for the supplemental exposures are determined by the analysis of the spectral density values of the copy master and by comparison with the color density curves of the copy material.Type: GrantFiled: January 15, 1991Date of Patent: January 14, 1992Assignee: Gretag Systems, Inc.Inventors: Werner R. von Stein, Walter Kraft
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Patent number: 5072639Abstract: Disclosed is a method and apparatus for removing wastepaper (W) from a continuous web(2) of photographic paper upon which photographic images (P.sub.1, P.sub.2 . . . ) have been printed. Between each photograph there exists a cut mark (4) that instructs a photographic print cutter (1) where one photograph ends and an adjacent photograph begins. The method comprises advancing the web to a point where a cut mark is expected and sensing the presence or absence of a cut mark. If a cut mark is sensed, the web is advanced to align the cut mark under a cutting knife (8) and the cutting knife is cycled. If a cut mark is not sensed, the web is reversed a predetermined reverse length before the cutting knife is cycled. By reversing the web the predetermined reverse length, it is assured that any length of wastepaper cut from the web will at least be as long as the reverse length. The reverse length is long enough to prevent jamming of the print cutter.Type: GrantFiled: June 5, 1991Date of Patent: December 17, 1991Assignee: Gretag Systems, Inc.Inventor: Richard A. Dolf
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Patent number: 5041869Abstract: The photoelectric scanner is equipped with two circular disks having aligned light passage orifices and mounted on a common drive shaft. Lenses are located in these orifices, the focal points of which are in the plane of the copy master to be scanned. The beam emitted by the source of copying light and parallelized by the condenser arrives through the curved slot of a stationary diaphragm on the lens instantaneously moving through the area of the slot and is focused in the plane of the copy master. From the lens synchronously running on the other side of the copy master, the parallelized beam of light arrives through the curved slot of a subsequent stationary diaphragm and a condenser on a receiving and detection unit with dichroitic mirrors, absorption filters and photoelectric detectors. These detectors convert the optical signals into electric signals, which are conducted to the evaluating electronic device.Type: GrantFiled: August 30, 1990Date of Patent: August 20, 1991Assignee: Gretag SystemsInventor: Beat Frick
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Patent number: 5036351Abstract: A exposure control process and a photographic color copying apparatus make possible the optimal adaptation of the evaluation of a copy master to the varying spectral sensitivities of different copy materials, without having to change the measuring filters. The measuring light components of each of the basic colors are detected by a wavelength selective detection device in at least two closely adjacent spectral ranges and the resultant measured values combined into prevailing color extract values.Type: GrantFiled: September 28, 1990Date of Patent: July 30, 1991Assignee: Gretag SystemsInventors: Beat Frick, Walter Kraft
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Patent number: 5016043Abstract: The copy originals are scanned photoelectrically by regions and three color densities are determined for each scanning regions. Additionally, using a high resolution scanning system, a detail contrast parameter describing the detail contrast in the scanning region is determined. The detail contrast parameters are evaluated together with the color densities of the scanning regions for the determination of the copy light quantities. In particular, in the correction of densities, scanning regions with higher detail contrasts are considered stronger than those with lower density contrasts, while color corrections are carried out in exactly the opposite manner.Type: GrantFiled: September 22, 1989Date of Patent: May 14, 1991Assignee: Gretag SystemsInventors: Walter Kraft, Werner R. von Stein
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Patent number: 4975723Abstract: A web-handling system for use in the processing of photographic print paper during the developing process includes a plurality of rollers mounted in a developing tank, at least some of the rollers being movable to vary the length of the paper path through the tank. The paper path length is continuously monitored and the input and output speed of drive rollers that move the paper into and out of the tank is controlled so that the path length is of the proper value to maintain the paper within the tank for a predetermiend time regardless of the rate of input of paper to the tank. The movable rollers are mounted on a carriage that is supported by the paper web when the handling system is in dynamic operation. A monitoring sensor is positioned near the input to the tank to monitor the transverse position of the paper web with respect to the paper path defined by the rollers and a roller adjustment device is controlled by the sensor to adjust the web position to maintain alignment of the web with the paper path.Type: GrantFiled: February 2, 1990Date of Patent: December 4, 1990Assignee: Gretag Systems, Inc.Inventors: Kenneth G. Hammerquist, Maxwell G. Maginness, Gordon L. Overbye