US3620481A - Web transport systems - Google Patents

Web transport systems Download PDF

Info

Publication number
US3620481A
US3620481A US730805A US3620481DA US3620481A US 3620481 A US3620481 A US 3620481A US 730805 A US730805 A US 730805A US 3620481D A US3620481D A US 3620481DA US 3620481 A US3620481 A US 3620481A
Authority
US
United States
Prior art keywords
web
spools
drive
torque
film
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.)
Expired - Lifetime
Application number
US730805A
Other languages
English (en)
Inventor
David John Stewart
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3620481A publication Critical patent/US3620481A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/43—Control or regulation of mechanical tension of record carrier, e.g. tape tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/02—Advancing webs by friction roller
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/32—Details specially adapted for motion-picture projection
    • G03B21/43—Driving mechanisms

Definitions

  • U.S. CI 242/203, ABSTRACT A web of photographic film or the like is 226/108, 226/188, 242/206, 355/99 stretched between two spools. A constant torque is applied to lnt.Cl Bllbl5/32, the spools in senses such that the web between the spools is G03b 1/04 placed in tension. Between the spools the web is wrapped Field of Search 355/99, about and engages part of the periphery of a drum The drum 103, I04, 108, 109, 110, 111; 242/203, 206; is driven by a stepby-step motor through a worm gear trans- 226/108, 188 mission.
  • This invention relates to transport devices for the controlled longitudinal movement of material in strip, ribbon, tape, or web form so as to render a particular region thereof accessible.
  • web is used in various industries to mean long continuous sheets of material of various widths; for instance, of paper and photographic film, and the tenn web" will be used herein for such long continuous sheets of any desired material and width.
  • An example of such a transport device is a film transport system, designed to move photographic film or paper between spools in order to bring a desired region into a position at which an image may be exposed upon it.
  • the example of photographic film moved for the purpose of exposure will be used, without prejudice to the use of the invention for other materials and processes.
  • a particular aspect of the film transport problem in which this invention offers improvements over methods used heretofore is the need to position a predetermined region of the film stationary at a particular location in space to high positional accuracy, and to perform a series of such film movements, with or without reversals of direction, without loss of positional accuracy.
  • FIGS. 1 and 2 indicate schematically existing web transport systems
  • FIG. 3 illustrates certain theoretical considerations involved
  • FIG. 4 shows schematically a perspective view of an embodiment of the invention, while FIGS. 5 and 6 show variants of FIG. 4.
  • FIGS. 1 and 2 show the situation in moving a film web FW between spools F SP, TUSP in the forward direction FD and in the reverse direction respectively under the action of drive forces which are opposed by a resistance-to-motion RM which prevents uncontrolled feed of the stock, and which is normally provided by a passive device such as a friction clutch.
  • FIGS. 1 and 2 also indicate means MCD for metering the passage of film, and for generating a control function to halt the motion at any desired position of the film.
  • a given design of torque motor may require a gear box GB between torque motor and spool, depending upon the nature of the web FW to be transported.
  • the gear box may be an antibacklash worm and wheel system.
  • An adequate degree of matching of the forces applied to the web FW via the spools, the rolls of web on which are obviously of variable radius, is necessary, but it is found in practice that this is easy to achieve using separate motors having the same specification: alternatively, one motor acting through a differential system may be used.
  • This system provides a virtually constant web tension which can be designed to have one of a wide range of values, and at the same time allows the force needed to keep the web stationary, bearing in mind the varying diameters of the web rolls on the spools; or to move it in either direction; to be very small, an important advantage, the significance of which will be explained later in relation to metering.
  • a third advantage is that there is no loss of tension on reversal or during a stop and restart sequence. Fourthly, full symmetry may be maintained: that is, substantially no difference in tension between the forward and reverse directions. Fifthly, no additional means are required to maintain the web in focus at the site of photographic exposure, since the web maintains its position normal to its own plane.
  • the electrical stepper motor When energized, but in the absence of drive pulses, such a motor exhibits a holding torque which, in practice, is large compared to the force needed to stabilize the web under the action of the opposed torque motors.
  • a pulse When a pulse is applied, the motor develops drive torque and moves its rotor by one step, typically one one-hundredth or one two-hundredth or I revolution.
  • a predetermined number of pulses can be chosen and applied conveniently by well-known digital methods.
  • FIG. 3 shows a web FW wrapped about a cylinder CY over a reflex angle 9 and under tensions T1 and T2 in opposite directions, the difference T,-T equaling the reaction of the cylinder, due to friction.
  • T,/T the difference of the reaction of the cylinder
  • Antibacklash worm reduction gear WG is provided to render the increments of stepper motor rotation, and of film advance, compatible. With appropriate care in the design and construction of this gear, films between 2 inches and l 1 inches in width, and of lengths up to 60 feet have been moved in increments which are multiples of 0.007 inches, or 0.18 mm. The loss of accuracy, after a sequence of some hundreds of separate movements, including reversals of directions, is ofthe order of 0.001 inches, or 0.02 mm.
  • This apparatus can be used for page printing on photographic film to produce a printing transparency.
  • the film is precessed by interline (i.e., line-by-line) steps, and can be precessed down one column, and in the reverse direction up a second column on the same page.
  • the number of steps to be taken by the stepper motor is determined by the number of electrical pulses applied thereto, which can be controlled, for example, by the well-known fixed-capacity count-out binary register, which is initially set by suitable control means to a position characteristic of the complement of the number of pulses required with respect to its capacity, and then counted out in synchronism with the transmission of pulses to the stepper motor.
  • the photographic beam can be directed upwards from below on to the film on the vertical axial plane of cylinder CY, when the properties of the associated optical system make the use of the large cylinder CY at the exposure station advantageous.
  • FIG. 5 the large cylinder CY, FIG. 4, is replaced by a metering roller MR spaced from the idler rollers RL.
  • the metering roller is driven from the stepping motor, not shown.
  • the feed spool FSP is in one container CN2, and the takeup spool TUSP together with the roller assembly MR, RL are in a second container CNl.
  • the web FW runs between the containers through opposed slots SL1, SL2, which may contain web guides if desired. In any case, the tension on the web, and the length of web between FSP and the adjacent idler roller RL are such that the web between FSP and RL will be uniplanar and at right angles to the axis 0A of the photographic light beam applied thereto.
  • FIG. 6 does not show any containers, and the single metering roller MR of FIG. 5 has been replaced by identical spaced rollers MR, FR geared together by an intermediate friction roller IR spring biased vertically downward against the rollers MR, FR.
  • Metering roller MR is driven by ste per motor DM, and roller FR is driven at the same speed an direction via nonslip friction roller IR.
  • the run of web between rollers MR, FR is used for photographic exposure purposes on optical axis 0A.
  • the electrical power for the torque generators may be replaced by hydraulic, or pneumatic, or spring, or gravity, power; and a single torque generator can provide the opposed torques for the spools via mechanical or other differential transmission systems.
  • Such generators may operate, of necessity or by choice, by limited torque transfer, instead of "at still, via any desired form of transmission; e.g., friction; electromagnetic electrostatic; electroviscous; or eddy current; transmission.
  • An example of such friction transmission would be through a slipping clutch, one plate or the like of which rotates with a slowly rotating generator, while the other, which is connected to a spool, is stationary.
  • the surface of the, or each, drive cylinder may have a high coefficient of friction.
  • torque-applying means operatively connected to said spools for applying torque in opposite sense to the spools respectively for maintaining the web between the spools in static tension;
  • drive means acting on the web between the spools for moving the web in one or other direction comprising two like, spaced, drive cylinders with a first run of the web from one spool to one drive cylinder and a second run of the web from the other spool to the other drive cylinder, an idler cylinder in pressure contact with both drive cylinders, power-drive means connected to one of said drive cylinders, and means for holding the web around both said drive cylinderns of the first and second runs adjacent said drive cylinders converge.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Advancing Webs (AREA)
  • Projection-Type Copiers In General (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
US730805A 1967-05-23 1968-05-21 Web transport systems Expired - Lifetime US3620481A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB23956/67A GB1213986A (en) 1967-05-23 1967-05-23 Improvements in or relating to web transport systems

Publications (1)

Publication Number Publication Date
US3620481A true US3620481A (en) 1971-11-16

Family

ID=10204065

Family Applications (1)

Application Number Title Priority Date Filing Date
US730805A Expired - Lifetime US3620481A (en) 1967-05-23 1968-05-21 Web transport systems

Country Status (6)

Country Link
US (1) US3620481A (enExample)
JP (1) JPS4937785B1 (enExample)
DE (1) DE1774292A1 (enExample)
FR (1) FR1570758A (enExample)
GB (1) GB1213986A (enExample)
NL (1) NL150580B (enExample)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0574916A3 (en) * 1992-06-18 1995-06-28 Fuji Photo Film Co Ltd Apparatus and method for supplying material and apparatus for treating material.
US5957359A (en) * 1995-07-06 1999-09-28 Nk Cables Oy Method and arrangement for levelling out the tension of optical fibres
US20030127487A1 (en) * 2000-04-27 2003-07-10 Thomas Liebeke Feeding devices for taped electric components
US20070084123A1 (en) * 2005-10-18 2007-04-19 Mitsui Mining & Smelting Co., Ltd. Wire winding apparatus
US20200200440A1 (en) * 2018-12-20 2020-06-25 Rheem Manufacturing Company Electronic Reversing Valve

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002279A (en) * 1974-12-30 1977-01-11 Monarch Marking Systems, Inc. Record feeding apparatus and method
JPS54149692U (enExample) * 1978-04-10 1979-10-18
DE19633825A1 (de) * 1996-08-22 1998-02-26 Reflecta Gmbh Foto Verfahren und Vorrichtung zum Planspannen eines Diabildes im Bereich einer Diabühne
CN113800304A (zh) * 2021-10-27 2021-12-17 河南舜禹防水工程有限公司 一种卷材防水铺设设备及卷材防水铺设方法

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1304565A (en) * 1914-05-16 1919-05-27 Cutler Hammer Mfg Co Winding mechanism.
US1847500A (en) * 1930-11-20 1932-03-01 Paragon Revolute Corp Printing machine for sensitized material
US2331451A (en) * 1940-08-24 1943-10-12 Rca Corp Film inspection and printing system
US2412551A (en) * 1944-06-10 1946-12-10 Verneur E Pratt Film feeding device
US2487476A (en) * 1947-03-05 1949-11-08 Verneur E Pratt Film feeding device
US2580270A (en) * 1947-10-04 1951-12-25 Robert F Badgley Automatic comparator for records
US2814676A (en) * 1954-09-23 1957-11-26 Anderson Nichols & Company Tape-stepping device for high-speed magnetic recording
US3288046A (en) * 1963-03-12 1966-11-29 Gretag Ag Step-by-step feed system for photocopying apparatus
US3374723A (en) * 1965-03-16 1968-03-26 Harlan L. Baumbach Automatic electrical control apparatus and film printer cuing system embodying same
US3451635A (en) * 1966-10-05 1969-06-24 Sanders Associates Inc Incremental magnetic tape recorder employing single spring drive mechanism

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1304565A (en) * 1914-05-16 1919-05-27 Cutler Hammer Mfg Co Winding mechanism.
US1847500A (en) * 1930-11-20 1932-03-01 Paragon Revolute Corp Printing machine for sensitized material
US2331451A (en) * 1940-08-24 1943-10-12 Rca Corp Film inspection and printing system
US2412551A (en) * 1944-06-10 1946-12-10 Verneur E Pratt Film feeding device
US2487476A (en) * 1947-03-05 1949-11-08 Verneur E Pratt Film feeding device
US2580270A (en) * 1947-10-04 1951-12-25 Robert F Badgley Automatic comparator for records
US2814676A (en) * 1954-09-23 1957-11-26 Anderson Nichols & Company Tape-stepping device for high-speed magnetic recording
US3288046A (en) * 1963-03-12 1966-11-29 Gretag Ag Step-by-step feed system for photocopying apparatus
US3374723A (en) * 1965-03-16 1968-03-26 Harlan L. Baumbach Automatic electrical control apparatus and film printer cuing system embodying same
US3451635A (en) * 1966-10-05 1969-06-24 Sanders Associates Inc Incremental magnetic tape recorder employing single spring drive mechanism

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0574916A3 (en) * 1992-06-18 1995-06-28 Fuji Photo Film Co Ltd Apparatus and method for supplying material and apparatus for treating material.
US5615961A (en) * 1992-06-18 1997-04-01 Fuji Photo Film Co., Ltd. Material conveying method and apparatus and material processing apparatus
US5957359A (en) * 1995-07-06 1999-09-28 Nk Cables Oy Method and arrangement for levelling out the tension of optical fibres
US20030127487A1 (en) * 2000-04-27 2003-07-10 Thomas Liebeke Feeding devices for taped electric components
US6834787B2 (en) * 2000-04-27 2004-12-28 Siemens Aktiengesellschaft Feeding devices for taped electric components
US20070084123A1 (en) * 2005-10-18 2007-04-19 Mitsui Mining & Smelting Co., Ltd. Wire winding apparatus
US7627990B2 (en) * 2005-10-18 2009-12-08 Mitsui Mining & Smelting Co., Ltd. Wire winding apparatus
US20200200440A1 (en) * 2018-12-20 2020-06-25 Rheem Manufacturing Company Electronic Reversing Valve

Also Published As

Publication number Publication date
JPS4937785B1 (enExample) 1974-10-12
FR1570758A (enExample) 1969-06-13
NL150580B (nl) 1976-08-16
NL6807284A (enExample) 1968-11-25
DE1774292A1 (de) 1971-07-29
GB1213986A (en) 1970-11-25

Similar Documents

Publication Publication Date Title
US3620481A (en) Web transport systems
US4426149A (en) Photocopier scanning drive system
US5794869A (en) Paper winding device for photographic printer
US4126817A (en) Servo system for maintaining constant tension on a web
US4299458A (en) Self threading phototypesetter transport system
US2227987A (en) Automatic projection printer
US4552450A (en) Variable magnification apparatus with lens position control
US2653508A (en) Intermittent feed mechanism utilizing control markings on film
US3767302A (en) Microfiche camera
US4386842A (en) Programmed acceleration
US4140386A (en) Electrophotographic apparatus
US3601487A (en) Microfiche step and repeat camera
US3539257A (en) Document photographing machine
US3689154A (en) Web transport system particularly for high resolution photographic printing
US4074934A (en) Electrostatographic imaging method and apparatus for multiple copies
US3885706A (en) Cassette pusher velocity regulator
US3354804A (en) Developing camera
US3979966A (en) Clutch device for either intermittent or continuous driving of perforated film
US3246857A (en) Strip handling device
US2541013A (en) Web feeding apparatus
ITMI931066A1 (it) Metodo ed apparecchio per la stampa di immagini
US4553825A (en) Photocomposing apparatus and method
US3529789A (en) Reversible drive means
US3581964A (en) Film transport mechanism
US3002424A (en) Film feeding device