US3441998A - Method of making a capstan - Google Patents

Method of making a capstan Download PDF

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Publication number
US3441998A
US3441998A US614967A US3441998DA US3441998A US 3441998 A US3441998 A US 3441998A US 614967 A US614967 A US 614967A US 3441998D A US3441998D A US 3441998DA US 3441998 A US3441998 A US 3441998A
Authority
US
United States
Prior art keywords
tape
capstan
layer
rolls
hub
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
US614967A
Other languages
English (en)
Inventor
Marcel Furst
Mervin L Falk
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.)
American Videonetics Corp
Omron Business Systems Inc
Original Assignee
Newell Associates Inc
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 Newell Associates Inc filed Critical Newell Associates Inc
Application granted granted Critical
Publication of US3441998A publication Critical patent/US3441998A/en
Assigned to OMRON BUSINESS SYSTEMS, INC. A CORP. OF DE reassignment OMRON BUSINESS SYSTEMS, INC. A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMERICAN VIDEONETICS CORPORATON A CA CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G11B15/26—Driving record carriers by members acting directly or indirectly thereon
    • G11B15/28—Driving record carriers by members acting directly or indirectly thereon through rollers driving by frictional contact with the record carrier, e.g. capstan; Multiple arrangements of capstans or drums coupled to means for controlling the speed of the drive; Multiple capstan systems alternately engageable with record carrier to provide reversal
    • G11B15/295—Driving record carriers by members acting directly or indirectly thereon through rollers driving by frictional contact with the record carrier, e.g. capstan; Multiple arrangements of capstans or drums coupled to means for controlling the speed of the drive; Multiple capstan systems alternately engageable with record carrier to provide reversal with single capstan or drum simultaneously driving the record carrier at two separate points of an isolated part thereof, e.g. the capstan acting directly on the tape rollers
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49453—Pulley making
    • Y10T29/49455—Assembly
    • Y10T29/49456—Assembly with shaping
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/4987—Elastic joining of parts
    • Y10T29/49872—Confining elastic part in socket

Definitions

  • This invention relates to tape transport apparatus, and more particularly to a method of making a capstan of a type for driving supply and take-up rolls of tape to transfer a length of tape from the former to the latter.
  • edge driven refers to the edge of the rolls as distinguished from the edges of the tape.
  • Another term for the present arrangement might be rim-driven rolls, but it is readily apparent that the rolls have no rim.
  • an annular rotating body adapted to be mounted for rotation.
  • the periphery around the body is adapted to engage and press against the edge of a roll of tape so as to develop reactive forces in the periphery such that these reactive forces act radially outwardly thereof.
  • the capstan construction herein is characterized by the fact that those reactive forces disposed to oppose the longitudinal outer margins of the engaged roll of tape are at least as great as those reactive forces developed in between. According to the method of manufacture disclosed herein, a uniformly homogeneous material can be employed to form the periphery of the capstan.
  • FIGURE 1 is a view partially in elevation cross-sec tion showing a capstan construction according to the invention and schematically disposed in conjunction with supply and take-up rolls;
  • FIGURE 2 is an enlarged detail view, in section, of
  • FIGURE 3 is an enlarged detail view, in section, similar to FIGURE 2 after attachment of flanges thereto;
  • FIGURE 4 is a further enlarged detail view, in section, of that portion of FIGURE 3 taken along the lines 4-4 thereof;
  • FIGURES 5 and 6 respectively show rolls of tape with and without the problem of cupping.
  • FIGURE 7 is a diagram of the invention showing a detailed portion of FIGURE 1.
  • capstan construction of a type for edge-driving supply and take-up rolls of tape for transferring a length of tape from the former to the latter.
  • the cylindrical capstan periphery includes a resilient driving surface bounded at the cylindrical end edges to preclude expansion laterally of the driving surface.
  • the back side of the resilient driving surface is supported by a homogeneous body as provided, for example, by a metal hub.
  • the capstan construction generally comprises a rigid annular hub adapted to be mounted for rotation.
  • a relatively thin layer of resilient material encircles the hub and is adapted for edge-driving engagement with rolls of tape.
  • a pair of flanges are carried by the ends of the hub and extend radially outwardly across the end edges of the driving layer. The flanges serve to compress the ends of the layer so as to support the layer against any endwise expansion of the layer under applied compression experienced during an edge-driving transfer of tape.
  • a supply roll 11 and take-up roll 12 are arranged whereby a capstan assembly 13 can be rotated to transfer tape 14 from hub 16 to take-up roll 12.
  • Capstan assembly 13 comprises an annular, generally cylindrical, hub 17 of a rigid material, such as cast aluminum.
  • Hub 17 includes a cylindrical periphery 18 having an axial extent essentially co-extensive with the width of tape 14.
  • Periphery 18 carries a relatively thin layer 19 of resil ient material, preferably polyurethane.
  • the material of layer 19 should be virtually completely free of any bubbles or pockets of porosity whereby uniform density of the material and support of tape is assured.
  • layer 19 is applied to hub 17, preferably by molding to form a structure as shown in FIGURE 2.
  • Layer 19 is disposed and dimensioned to provide end edges 21, 22. The edges are then reduced down to a point where they overhang the ends 23, 24 of hub 17 only slightly. This is preferably accomplished by grinding edges 21, 22 until the plane of ends 23, 24 is reached. When the grinding tool is removed, the resilience of the material of layer 19 causes edges 21, 22 to spring back an amount suitable for providing the advantageous anti-cupping properties to the capstan.
  • the extent to which edges 21, 22 then extend beyond ends 23, 24 has been found, in the case of a quarter-inch wide periphery 18, of polyurethane, to run on the order of 0.001 inch.
  • flanges 27, 28 are coupled, as by screws, to the respective ends 23, 24 of hub 17.
  • a side wall member such as flanges 27, 28 bears against each of the end edges 21, 22 of layer 19 and compresses them in a direction axially of hub 17 so as to form bulge 25 along the edge margins of layer 19.
  • a capstan construction as described above, is adpated to be driven by a spindle 29 and mounted for rotation in edge-driving relation to supply and take-up rolls 11, 12.
  • supply and take-up rolls 11, 12 may be resiliently urged, as by springs 31, 32 toward capstan 13. In this manner compression is applied to the face of layer 19.
  • a particularly preferred construction of the above arrangement has been built and successfully operated to eliminate cupping (as shown in FIGURE 5) for a one-quarter inch width of magnetic recording tape wherein the thickness of layer 19 ran on the order of 0.0625 to 0.125 inch. It was found that the former dimension may be somewhat too thin to successfully accommodate splices in the tape and run-out found in the roll of tape and therefore represents a minimum thickness.
  • the material of layer 19 preferably, as noted above, consists essentially of polyurethane and preferably has a hardness within a range on the order of 40-60 durometer (shore A). Using fixed flanges as shown in the drawings, the tape edges of rolls 11, 12 preferably provide a closely spaced fit with the bounding surfaces 33, 34 of flanges 27, 28.
  • a slight positive spacing between surfaces 33, 34 preferably runs on the order of 0.001 to (-1-) 0.002 inch relative to the Width of tape 14. Accordingly,the axial extent of periphery 18 is substantially coextensive with the width of tape 14.
  • capstan construction entails a capstan of a type for drivably moving the edge of a roll of tape
  • capstan construction of a type for edge driving shall be deemed to include other annular rotating bodies of a type, for example, such as idler rolls and tape roll followers or other arcuate tape guides such as employed, for example, in the spooling of tape or otherwise.
  • a method of constructing a capstan of a type for edgedriving supply and take-up rolls of tape to transfer a length of tape from the former to the latter comprising the steps of forming an annular homogeneous body of material to include a cylindrical periphery having an axial extent substantially coextensive with the width of the tape to be transferred, applying to said body periphery a relatively thin homogeneous layer of resilient material, the width of said layer being greater than the axial extent of said periphery, said layer being dimensioned and disposed to provide end edges of said layer slightly overhanging the ends of said body, disposing a bounding surface of a side wall member against each of the end edges of said layer and compressing said end edges in a direction axially of the body to bulge said layer along the end margins thereof, and thereafter attaching said members to said body to preserve said bulging margins around said capstan.
  • a method of constructing a capstan of a type for edge-driving supply and take-up rolls of tape to transfer a length of tape from the former to the latter comprising the steps of forming an annular hub of rigid matreial to include a cylindrical periphery having an axial extent substantially coextensive with the width of the tape to be transfered, molding to said hub periphery a relatively thin layer of resilient material, the width of said layer being greater than the axial extent of said hub periphery, grinding the end edges of said layer to the plane of the ends of said hub, disposing a bounding surface of a side wall member against each of the end edges of said layer and compressing said end edges in a direction axially of the hub to bulge said layer along the end margins thereof, and thereafter coupling said members to said hub to retain said bulging margins around said capstan.

Landscapes

  • Rolls And Other Rotary Bodies (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
US614967A 1967-02-09 1967-02-09 Method of making a capstan Expired - Lifetime US3441998A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US61496767A 1967-02-09 1967-02-09

Publications (1)

Publication Number Publication Date
US3441998A true US3441998A (en) 1969-05-06

Family

ID=24463452

Family Applications (1)

Application Number Title Priority Date Filing Date
US614967A Expired - Lifetime US3441998A (en) 1967-02-09 1967-02-09 Method of making a capstan

Country Status (5)

Country Link
US (1) US3441998A (en。)
BE (1) BE710388A (en。)
FR (1) FR1555037A (en。)
GB (1) GB1205891A (en。)
NL (1) NL6801791A (en。)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707608A (en) * 1967-08-02 1972-12-26 Matsushita Electric Ind Co Ltd Method and apparatus for duplicating a magnetic tape
US4040160A (en) * 1972-11-04 1977-08-09 Kabushiki Kaisha Sankyo Seiki Seisakusho Method of manufacturing symbol indication drum
US4287651A (en) * 1979-04-17 1981-09-08 Otis Elevator Company Method for fabricating and installing thermoset sheave inserts
US4781661A (en) * 1987-06-19 1988-11-01 Emmett John E Boss mounted, non-metallic pulley

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA980004A (en) * 1971-04-09 1975-12-16 Yutaka Higashida Magnetic tape duplicating system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1837223A (en) * 1930-10-11 1931-12-22 Fox Film Corp Self-aligning roller for developing machines
US1992989A (en) * 1930-11-03 1935-03-05 Hughes Ind Co Ltd Film roller and driving mechanism
US3334402A (en) * 1963-08-16 1967-08-08 Angelo C Cuva Method of manufacturing tape reels

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1837223A (en) * 1930-10-11 1931-12-22 Fox Film Corp Self-aligning roller for developing machines
US1992989A (en) * 1930-11-03 1935-03-05 Hughes Ind Co Ltd Film roller and driving mechanism
US3334402A (en) * 1963-08-16 1967-08-08 Angelo C Cuva Method of manufacturing tape reels

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707608A (en) * 1967-08-02 1972-12-26 Matsushita Electric Ind Co Ltd Method and apparatus for duplicating a magnetic tape
US4040160A (en) * 1972-11-04 1977-08-09 Kabushiki Kaisha Sankyo Seiki Seisakusho Method of manufacturing symbol indication drum
US4287651A (en) * 1979-04-17 1981-09-08 Otis Elevator Company Method for fabricating and installing thermoset sheave inserts
US4781661A (en) * 1987-06-19 1988-11-01 Emmett John E Boss mounted, non-metallic pulley

Also Published As

Publication number Publication date
FR1555037A (en。) 1969-01-24
BE710388A (en。) 1968-08-06
NL6801791A (en。) 1968-08-12
GB1205891A (en) 1970-09-23

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Legal Events

Date Code Title Description
PA Patent available for licence or sale
AS Assignment

Owner name: OMRON BUSINESS SYSTEMS, INC. 1300 NORTH BASSWOOD R

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMERICAN VIDEONETICS CORPORATON A CA CORP.;REEL/FRAME:004306/0720

Effective date: 19840809