EP0574421A1 - Procede et dispositif d'entrainement precis de films - Google Patents

Procede et dispositif d'entrainement precis de films

Info

Publication number
EP0574421A1
EP0574421A1 EP92904623A EP92904623A EP0574421A1 EP 0574421 A1 EP0574421 A1 EP 0574421A1 EP 92904623 A EP92904623 A EP 92904623A EP 92904623 A EP92904623 A EP 92904623A EP 0574421 A1 EP0574421 A1 EP 0574421A1
Authority
EP
European Patent Office
Prior art keywords
driven roller
rollers
roller
precision
driven
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
EP92904623A
Other languages
German (de)
English (en)
Other versions
EP0574421A4 (fr
Inventor
Mario Baffo
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.)
ECRM Trust
Original Assignee
ECRM Inc
ECRM Trust
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 ECRM Inc, ECRM Trust filed Critical ECRM Inc
Publication of EP0574421A1 publication Critical patent/EP0574421A1/fr
Publication of EP0574421A4 publication Critical patent/EP0574421A4/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2403/00—Power transmission; Driving means
    • B65H2403/50—Driving mechanisms
    • B65H2403/51—Cam mechanisms
    • B65H2403/512—Cam mechanisms involving radial plate cam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/14—Roller pairs
    • B65H2404/144—Roller pairs with relative movement of the rollers to / from each other
    • B65H2404/1441—Roller pairs with relative movement of the rollers to / from each other involving controlled actuator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B65H2511/22—Distance
    • B65H2511/224—Nip between rollers, between belts or between rollers and belts

Definitions

  • the invention relates generally to a method and apparatus for driving thin materials, and in partic ⁇ ular to a method and apparatus for precisely control ⁇ ling the movement of film materials between a pair of rollers in an electronic imaging system.
  • rollers can include covering one or both rollers with a rubber layer to grab the film.
  • the rubber covering is very soft, it advanta ⁇ geously grasps the film; however, the rubber can pull or stretch, causing the film to move unevenly, especially in the driven direction.
  • the rubber may not grip the film firmly enough and slippage may occur.
  • Other roller combinations pair a soft rubber-coated driven roller with a hard rubber-coated non-driven roller; but in such a compromise the film tends to curl around the * " soft rubber roller rather than properly exiting from
  • a primary object of the invention therefore is to construct a roller system wherein one roller is urged against another roller in a manner which precisely controls the location of the film, produces a precise drive control, eliminates skew, and is mechanically simple to build.
  • the invention relates to an apparatus and method for passing film material between two rollers wherein a non-driven roller is urged against a driven roller in a manner that causes one roller to compress in a precise and controlled manner as the material passes between the rollers.
  • the driven roller is the width of the film or sheet to be driven through the roller pair, while the non-driven roller is longer than the width of the material being driven.
  • the driven roller has a metal core and an outer surface made of a medium hardness rubber
  • bearings having precision surfaces, are attached at either end of the shaft of the driven roller.
  • the non-driven roller is made of a hard material, preferably metal, and extends beyond the width of the film on both ends to contact the precision alignment bearing surfaces and thus create a precise alignment surface relative to the driven roller.
  • a spring which connects to the non-driven roller and urges the non-driven roller against the driven roller bearing surface. Pressure from the spring ensures that the non-driven roller stays in contact with the driven roller bearing surface, and when film is inserted between the two rollers, the rubber of the driven roller is caused to compress under the spring force.
  • the rubber cover ⁇ ing of the driven roller is approximately 1/8 inch thick, but the thickness can vary as long as the rubber is thick enough to be compressed when the film passes between the rollers in their operative driving position.
  • the effective radius of the driven roller will be determined, mainly, by the diameter of the bearing surfaces (which is constant and very precise) and by the thickness of the film material inserted between the two rollers (the thickness variations are minute). In this way, any fluctuation in the diameter of the uncompressed driven roller rubber surface will automatically be compensated for by the compression of the rubber by the film.
  • precision wheels attached to or a part of, or integral with the driven roller shaft, can be used in place of bearings.
  • the wheels would be coaxial with the driven roller shaft and engage the bottom roller in the same manner as the bearings described above.
  • Other alignment mechanisms can be attached to the shaft of the driven roller or be otherwise incorporated in the driven roller, for the same purpose.
  • the non- driven roller of the invention is attached at its ends to respective pivoting arms, each of which is attached to a spring that urges the non-driven roller against the precision alignment surfaces of the driven roller.
  • One arm is engaged by a cam-lever mechanism which pivots the non-driven roller away from the driven roller to allow insertion of the film therebetween.
  • Figure 1 is a schematic representation of a typical application of the invention
  • Figure 2 is a front elevation view showing the roller assembly of a preferred embodiment of the invention.
  • Figure 3 is a front elevation view showing the roller assembly of the preferred embodiment of the invention with film material therebetween;
  • Figure 4 is a cross-sectional view along lines AA of Figure 2;
  • Figure 5 is a cross-sectional view along lines BB of Figure 3.
  • Figure 6 is a side elevation view showing the roller assembly with the pivoting arm mechanism.
  • Figure 7 is a front elevation view the roller assembly according to another particular embodiment of the invention. Description of a Preferred Embodiment
  • a film recording system 3 has a supply cassette 5a and a take-up cassette 5b for a film material 24.
  • the film material 24 passes around a driven roller 6 which has a rubber coating 22 to grab and drive the film material 24.
  • the driven roller 6 drives the film primarily at a nip formed between the roller and a non-driven roller 12.
  • the film is exposed, for example by a laser scanning mechanism 7 along an image line 5c as the film passes the line 5c (which is traced by the laser scanning system) .
  • a roller system 4 advances a film material between a driven roller 6, driven by a motor 8 which engages its shaft 10, and a non-driven roller 12 which is urged into contact with precision alignment surfaces 13 of bearings 14 constrained at each end of the driven roller shaft 10.
  • Non-driven roller 12 is a precision machined metallic cylinder which is urged against the bearing surfaces 13 of roller bearings 14 by springs 16 attached to a pivoting arm 26 (shown in Figure 6) at spring posts 20.
  • the driven roller 6 has a medium hardness rubber coating 22 of between 45-70 durometers, approximately 1/8 inch thick, covering a metallic cylindrical core 23.
  • Figure 4 which is cross- sectional view taken along line AA in Figure 2, the two rollers 6 and 12 are urged against each other so that the hard surface of roller 12 rests against the precision surfaces 13 of bearings 14.
  • the interaction of the surfaces 13 and the hard, non- driven roller 12 control the spacing between the non- driven roller and the rubber surface of the driven roller 6.
  • the surface of driven roller 6 may have small imperfections because it is composed of a rubber surface coating, the actual spacing between the two rollers may vary at their closest points of contact.
  • the two rollers are just touching when in this film-free operative position.
  • the effective driving radius R (between the shaft axis 25 and the film) of the driving roller 6 is tightly controlled across its entire length, thereby precisely and accurately driving the film material through the nip between the rollers.
  • the compression of the rubber coating 22 is illustrated in the cross- sectional view along line B-B taken in Figure 3 and illustrated in Figure 5.
  • Non-driven roller 12 is attached at either end of its shaft 18 to a pivoting arm 26.
  • Each arm 26 pivots around pivot pins 28.
  • a cam 30, rotated by a lever 32 has an interfering relationship with arm 26 as the cam rotates (as lever 32 rotates); and the pivoting arm 26, in response, moves or pivots roller 12 away from driven roller 6 for loading or inserting film between the rollers.
  • springs 16 extend.
  • the cam 30 is rotated to allow pivoting arm 26 to swing upward into a closed, operative position, where roller 12 is urged against bearing surface 15, with the rubber coating 22 of driven roller 6 being compressed by the action of roller 12 bearing against the film material.
  • the precision surfaces 13 can be integral with the rubber coated roller surface 22 and can be integrally attached to and be part of the shaft 10.
  • An alternative construction could provide for a single driven roller of constant nominal diameter wherein the ends of the roller contain the hard precision align ⁇ ment surfaces while the interior of the roller has relatively softer rubber surface.
  • the rubber surface should not be either too hard or too soft since to make it too hard prevents the compression needed to properly grab and move the film through the nip between the rollers, while to make it too soft can cause, as noted above, an undesirable flexibility and uncontrollable movement of the rubber, much like a spongy material, even under compression.
  • other materials having the desired coefficients of friction and hardness could be substituted for the materials described in the illustrated embodiment.

Landscapes

  • Rolls And Other Rotary Bodies (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)

Abstract

Dispositif assurant le défilement précis d'un film (24) entre deux rouleaux, comprenant un rouleau entraîné (22) présentant une surface en caoutchouc de dureté moyenne et un rouleau non entraîné (12) à surface dure qui est en contact avec des surfaces de précision (13) à chaque extrémité du rouleau entraîné (22), afin de commander avec précision l'écartement entre les deux rouleaux. Le rouleau non entraîné (12) est sollicité contre les surfaces de précision du rouleau entraîné par une force de ressort (16), et provoque la compression du caoutchouc du rouleau entraîné lorsque le film se trouve dans une position opérationnelle entre la paire de rouleaux.
EP92904623A 1991-03-05 1992-01-15 Procede et dispositif d'entrainement precis de films Ceased EP0574421A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US66481991A 1991-03-05 1991-03-05
US664819 1991-03-05

Publications (2)

Publication Number Publication Date
EP0574421A1 true EP0574421A1 (fr) 1993-12-22
EP0574421A4 EP0574421A4 (fr) 1994-02-23

Family

ID=24667568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92904623A Ceased EP0574421A1 (fr) 1991-03-05 1992-01-15 Procede et dispositif d'entrainement precis de films

Country Status (4)

Country Link
EP (1) EP0574421A1 (fr)
JP (1) JPH06508330A (fr)
CA (1) CA2105476A1 (fr)
WO (1) WO1992015512A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5754913A (en) * 1995-06-20 1998-05-19 Ecrm Incorporated Sheet transporting
CN102351115A (zh) * 2011-06-29 2012-02-15 吴江市金晟工艺制品有限责任公司 一种草席牵引装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2334820A (en) * 1940-09-30 1943-11-23 John F Hawley Printing press
US4368837A (en) * 1979-12-05 1983-01-18 Jagenberg Werke Ag Web feed section
EP0222390A2 (fr) * 1985-11-12 1987-05-20 Somar Corporation Appareil de transport de substrats avec guidage transversal
JPS6413344A (en) * 1987-07-06 1989-01-18 Minolta Camera Kk Picture image forming device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2786672A (en) * 1954-07-15 1957-03-26 Mid States Gummed Paper Co Tape-feeding mechanism
US2788209A (en) * 1955-09-19 1957-04-09 Rca Corp Web feeding mechanism
CS179194B1 (en) * 1975-08-25 1977-10-31 Josef Resch Device for takin off leno waste in weaving machines
US4383631A (en) * 1981-05-04 1983-05-17 Fairchild Wayne K Tensioning control device
JPS58196142U (ja) * 1982-06-24 1983-12-27 アルプス電気株式会社 ペン式記録装置のシ−ト押え機構

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2334820A (en) * 1940-09-30 1943-11-23 John F Hawley Printing press
US4368837A (en) * 1979-12-05 1983-01-18 Jagenberg Werke Ag Web feed section
EP0222390A2 (fr) * 1985-11-12 1987-05-20 Somar Corporation Appareil de transport de substrats avec guidage transversal
JPS6413344A (en) * 1987-07-06 1989-01-18 Minolta Camera Kk Picture image forming device

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN no. 6 , November 1979 pages 2230 - 2231 BULLOCK AND CHURCH 'paper feed roller and transport' *
PATENT ABSTRACTS OF JAPAN vol. 13, no. 183 (M-820)(3531) 28 April 1989 & JP-A-01 013 344 (MINOLTA CAMERA CO.) 18 January 1989 *
See also references of WO9215512A1 *

Also Published As

Publication number Publication date
WO1992015512A1 (fr) 1992-09-17
CA2105476A1 (fr) 1992-09-06
EP0574421A4 (fr) 1994-02-23
JPH06508330A (ja) 1994-09-22

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