US3857312A - Low drag variable demand strip feed - Google Patents

Low drag variable demand strip feed Download PDF

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Publication number
US3857312A
US3857312A US00395368A US39536873A US3857312A US 3857312 A US3857312 A US 3857312A US 00395368 A US00395368 A US 00395368A US 39536873 A US39536873 A US 39536873A US 3857312 A US3857312 A US 3857312A
Authority
US
United States
Prior art keywords
loop
strip
strip material
feed
draw
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
US00395368A
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English (en)
Inventor
P Carlstedt
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.)
Cx Corp
Original Assignee
Cx Corp
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 Cx Corp filed Critical Cx Corp
Priority to US00395368A priority Critical patent/US3857312A/en
Priority to NO742087A priority patent/NO742087L/no
Priority to DE2430105A priority patent/DE2430105A1/de
Priority to JP49091136A priority patent/JPS5056939A/ja
Priority to FR7429400A priority patent/FR2243135A1/fr
Priority to IT69631/74A priority patent/IT1016661B/it
Application granted granted Critical
Publication of US3857312A publication Critical patent/US3857312A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/58—Baseboards, masking frames, or other holders for the sensitive material
    • G03B27/587—Handling photosensitive webs
    • G03B27/588—Supply rolls; Cutting arrangements
    • 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
    • B65H20/00—Advancing webs
    • B65H20/24—Advancing webs by looping or like devices
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/444—Tool engages work during dwell of intermittent workfeed
    • Y10T83/4529—With uninterrupted flow of work from supply source
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/647—With means to convey work relative to tool station
    • Y10T83/6475—With means to regulate work-feed speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/647—With means to convey work relative to tool station
    • Y10T83/6579—With means to press work to work-carrier

Definitions

  • Frictional driving contact of the opposite side of the running slack loop with the feed roll is established or increased when the receiving device pulls strip material from the loop, thereby shortening the loop and by the resultant resilient reaction of the loop material pressing the loop side against the feed roll and causing feed roll to draw additional material from the supply reel ,or other source, overcoming the effects thereof in terms of inertia, momentum and friction.
  • This invention relates to strip feed apparatus wherein drawing of elongated strip material of indefinite length from a supply roll or other source at variable rate and at low drag is made possible by interposing between the source and the utilization device a novel feed mechanism which overcomes the effects of inertia, momenturn and friction of a rotationally mounted heavy supply roll or other source of strip material by providing a running slack loop of strip material from which the utilization device draws its requirements.
  • the present invention is concerned with a new and improved means and technique for accomplishing this function by drawing strip material from the supply roll or other source at a rate which continuously supplies the demand of the cutter feed and without regard to the effects of friction, inertia and momentum.
  • a broad object of this invention is to provide a new and improved, simplified and more reliable means to draw strip material from a source subject to the effects of momentum, inertia or friction or a combination thereof and to make the strip of material available at low drag and in such a manner as to meet a widely variant demand rate such as is encountered by a photoprint cutter and packaging device.
  • the invention provides a novel means to form'a running slack loop of strip material from which the utilization or receiving device such as the cutter draws its requirements and'into which loop additional material is intermittently or continuously fed as necessary in order to maintaion a slack loop of adequatelength available as a source of material accommodating the requirements of the utilization device.
  • Still another object of this invention considering its application to photoprint cutting and packaging systerns, is to provide an improved feed wherein the emulsion surface of a photoprint strip is inherently pro-" tected against damage by obviating any need for physical contact between the emulsion surface and any, element of the feed mechanism.
  • a related and further object is to devise a variable demand low drag feed means which operates without danger of tearing or jamming of the strip material being fed and which has the inherent capability of accommodating widely varying average and instantaneous rates of feed of the strip material demanded by the receiving or utilization device associated therewith.
  • FIG. 1 is an isometric view of the presently preferred embodiment of the novel feed mechanism.
  • FIG. 2 is a side elevation of the feed mechanism and an associated utilization device such as a photoprint cutter and packaging device shown in block. for purposes of easy illustration.
  • a supply roll of photoprint strip material has a hollow center enabling it to be hung on a horizontal stationary support shaft 12 which is cantilevered laterally from the upper end of a support arm I4 mounted on a base 16.
  • the base 16 projects up from one side of a support table 18 which serves as a strip loop support and guide.
  • the support table extends generally in the plane of feed, which occurs in the direction of arrow 20, in this instance in a horizontal plane leading to a receiving or utilization device 22 such as photoprint cutter and packaging mechanism which incorporates its own feeding means of the nature previously mentioned.
  • the feeding means incorporated in the device 22 is assumed to be of such a nature that it requires strip material to be made available to it at low dragand in quantities satisfying variable demand rates, with minimal effects of momentum and inertia to be overcome. It is to supply these requirements of the utilization device that the illustrated embodiment of the invention is directed.
  • the guide table 18 extending toward the cutter 22, in this case horizontally in a location generally beneath the cantilever support shaft 12, has a rearward extension 180 with an upturned end portion 180 which serves as a loop 'stop or retainer assuring that the running slack loop 10a of photoprint strip material does not become unduly lengthened and spill off the end of the support table 18.
  • Strip material drawn from the supply roll 10 is drawn downwardly in a variably tensioned stretch or run 1012 and passes around and under the feed roll 24 toward the stop 18a.
  • the periphery of feed roll 24 is spaced a short distance above the top side of the support or guide table 18 to form a gap G therebetween.
  • the surface of the drive roll 24 has suitable frictional elements or material 24a thereon. such as the rubber bands 24a located at intervals along its length, which are capable of making frictional contact with the back or upper such that when the material is pressed against these bands the frictional engagement is sufficient to create adequate traction to draw strip material from the roll 10 rotationally supported on the shaft 12.
  • the strip material In extending toward backing plate 18a the strip material is curved downwardly and then forwardly toward the cutter 22 supportedon table 18, and thereby forms the running slack loop 10a, again passing beneath the drive roll 24.- Thus, the two sides of therunning slack loop 10a are caused to pass through the gap G and the variablelength running slack loop itself is thereby trapped between that gap and the backstop 18a.
  • a motor device 26 continuously rotates the feed roll 24 in such a direction that frictional contact pressure of the drive roll with the upper side of the loop passing around it with a partial wrap draws material from the roll 10.
  • the speed of rotation and thereby the peripheral speed of the drive roll 24 is made sufficiently high that no matter what the demand rate of the utilization device 22 may be the feed roll is capable of acting at sufficient speed to supply additional strip material to replenish and maintain the running sla'ckloop 100 as needed. Obviously, this speed requirement will vary with different applications of the invention and there is therefore no specific range or velocity of rotation to be indicated.
  • the supply roll 10 has an open center larger than the diameter of the support shaft 12.
  • the support shaft 12 may or may not be rotative. If non-rotative, frictional restraint is exerted on thesupply roll 10 to be overcome in turning the roll 10 as strip material is unwound y from it. However, some friction is desirable in that it (non-emulsion) side of the strip of photoprint material, I
  • the location of the shaft 12 while shown to be directly above the axis of the drive roll 24, that is, in the same common vertical plane. therewith, is not necessarily required to be as depicted.
  • the support shaft 12 may be located nearer to the backstop 18a than the shaft 24 and thereby increase the angle of wrap of the strip material around the drive roll 24 in passing from the stretch 10b into the upper side of the running slack loop 10a.
  • Such an increased angle of wrap tends to increase the total tractive effort harnessed with a given friction force applied to draw additional material from the supply roll 10 when the running slack loop 10a is shortened in the process of drawing material from it into the utilization device.
  • the second element comprises a strip supporting guide table upon which rests said opposite side of the loop in generally horizontal position.
  • the receiving means comprises a photoprint strip' cutter mechanism generally aligned with said guide table and operable to draw strip material in successive intermittent movements
  • the supply means comprises a rolled strip rotational support mounted generally above said guide table.
  • a first feed means operable to draw the strip material at variable rate
  • a second feed means preceding the first feed means and operable to draw strip material'from the supply means in response to drawing of strip material by the first feed means
  • said second feed means forming a running slack loop of the strip material one side of which extends to the first feed means to be drawn freely thereby and the other side of which extends to'the supply' means
  • said second feed means comprising an independently driven rotative element and an opposing strip guide element so positionally related to the rotative element as to capture and hold said loop with the sides of the loop passing between the elements and the base of the loop maintained by its resilient stiffness wider than the spacing between said elements, the rotative element being 'frictionally engageable with the strip in reactive response to shortening of the loop by the first feed means so as to thereby draw strip material from the supply means to relengthen the loop.
  • strip guide element is a stationary element slidably engageable with the -strip and the rotative element is positioned relatively to deflect the strip with a partial wrap around it into the loop.
  • a first feed means operable to draw the strip material at variable rate
  • a second feed means preceding the first feed means and operable to draw strip material from the supply means in response to drawing of strip material by the first feed means
  • said second feed means includingopposing elements forming a running slack loop of the strip material, one side of which extends to the first feed means to be drawn freely thereby and the other side of which extends to the supply means
  • one element of said second feed means comprising a continuously rotated friction roll slidably engageable with the strip on one side of the loop and operable in direct reactive response to shortening of the loop, causing the strip to press more forcibly against said friction ,roll thereby to draw strip material from the supply means so as to relengthen the loop.
  • first means to rotatively support a supply roll of processed photoprint strip from which the strip may be pulled
  • second means operable to feed the strip at a rapidly variablerate for the cutting of prints requiring strip acceleration rates of which the second means are substantially incapable if worked directly against the inertia and drag of the supply roll on the first means
  • third means operatively interposed between the first and second means and maintaining a continuous running slack loop of the strip which is materially shortened as strip material is drawn from one side of the loop by the second means, said third means including opposing elements relatively positioned to bear against opposite sides of the loop 12.
  • the second element of the third means comprises a lowfriction stationary guide means across which the strip on one side of the loop is drawn slidably-by the second means.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Advancing Webs (AREA)
  • Unwinding Webs (AREA)
US00395368A 1973-09-07 1973-09-07 Low drag variable demand strip feed Expired - Lifetime US3857312A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00395368A US3857312A (en) 1973-09-07 1973-09-07 Low drag variable demand strip feed
NO742087A NO742087L (no) 1973-09-07 1974-06-10
DE2430105A DE2430105A1 (de) 1973-09-07 1974-06-22 Verfahren zum zufuehren von bandmaterial mit einer sich sehr rasch aendernden geschwindigkeit und vorrichtung zur durchfuehrung desselben
JP49091136A JPS5056939A (no) 1973-09-07 1974-08-08
FR7429400A FR2243135A1 (no) 1973-09-07 1974-08-28
IT69631/74A IT1016661B (it) 1973-09-07 1974-08-28 Alimentatore di materiale in nastro a richiesta variabile particolar mente di nastro di fotocopie da tagliare

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00395368A US3857312A (en) 1973-09-07 1973-09-07 Low drag variable demand strip feed

Publications (1)

Publication Number Publication Date
US3857312A true US3857312A (en) 1974-12-31

Family

ID=23562750

Family Applications (1)

Application Number Title Priority Date Filing Date
US00395368A Expired - Lifetime US3857312A (en) 1973-09-07 1973-09-07 Low drag variable demand strip feed

Country Status (6)

Country Link
US (1) US3857312A (no)
JP (1) JPS5056939A (no)
DE (1) DE2430105A1 (no)
FR (1) FR2243135A1 (no)
IT (1) IT1016661B (no)
NO (1) NO742087L (no)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0116336A2 (de) * 1983-02-10 1984-08-22 Ulrich Steinemann AG Maschinenfabrik Vorrichtung zur Aufnahme und Steuerung einer Ausgleichsschlaufe in einem kontinuierlich herangeführten und schrittweise weiterbewegten Metallband
US5032707A (en) * 1989-02-08 1991-07-16 Standard Manufacturing Bagless film handling system
US7404349B1 (en) * 2004-11-22 2008-07-29 Roll Systems, Inc. System and method for cutting continuous web

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2814486A (en) * 1954-12-31 1957-11-26 Ibm Web feeding apparatus
US3561655A (en) * 1968-05-18 1971-02-09 Sankyo Kogaku Kk Movie film feed control device
US3704820A (en) * 1971-05-03 1972-12-05 Burroughs Corp Web tension control device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2814486A (en) * 1954-12-31 1957-11-26 Ibm Web feeding apparatus
US3561655A (en) * 1968-05-18 1971-02-09 Sankyo Kogaku Kk Movie film feed control device
US3704820A (en) * 1971-05-03 1972-12-05 Burroughs Corp Web tension control device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0116336A2 (de) * 1983-02-10 1984-08-22 Ulrich Steinemann AG Maschinenfabrik Vorrichtung zur Aufnahme und Steuerung einer Ausgleichsschlaufe in einem kontinuierlich herangeführten und schrittweise weiterbewegten Metallband
EP0116336A3 (de) * 1983-02-10 1986-05-14 Ulrich Steinemann AG Maschinenfabrik Vorrichtung zur Aufnahme und Steuerung einer Ausgleichsschlaufe in einem kontinuierlich herangeführten und schrittweise weiterbewegten Metallband
US5032707A (en) * 1989-02-08 1991-07-16 Standard Manufacturing Bagless film handling system
US7404349B1 (en) * 2004-11-22 2008-07-29 Roll Systems, Inc. System and method for cutting continuous web

Also Published As

Publication number Publication date
IT1016661B (it) 1977-06-20
FR2243135A1 (no) 1975-04-04
DE2430105A1 (de) 1975-03-13
JPS5056939A (no) 1975-05-19
NO742087L (no) 1975-04-01

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