US3512692A - Tape handling apparatus - Google Patents

Tape handling apparatus Download PDF

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Publication number
US3512692A
US3512692A US728139A US3512692DA US3512692A US 3512692 A US3512692 A US 3512692A US 728139 A US728139 A US 728139A US 3512692D A US3512692D A US 3512692DA US 3512692 A US3512692 A US 3512692A
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US
United States
Prior art keywords
tape
reservoir
suction
loop
web
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
US728139A
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English (en)
Inventor
Frederick Henry Patrick Horton
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.)
International Computers and Tabulators Ltd
Original Assignee
International Computers and Tabulators Ltd
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 International Computers and Tabulators Ltd filed Critical International Computers and Tabulators Ltd
Application granted granted Critical
Publication of US3512692A publication Critical patent/US3512692A/en
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
    • G11B15/56—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 the record carrier having reserve loop, e.g. to minimise inertia during acceleration measuring or control in connection therewith
    • G11B15/58—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 the record carrier having reserve loop, e.g. to minimise inertia during acceleration measuring or control in connection therewith with vacuum column

Definitions

  • a tape handler having a vacuum tape reservoir and a brake block to which suction is applied so as to apply a braking force to the tape.
  • the suction supply for the brake block is derived from the vacuum tape reservoir so that during normal operation with a loop of tape in the reservoir, maximum suction is applied to the brake block whereas during a first rewind operation the tape is withdrawn from the reservoir thereby reducing the suction in the reservoir and hence the suction applied to the brake block.
  • This invention relates to tape handling apparatus.
  • US. Pat. No. 3,291,410 discloses a tape handling apparatus having a tape braking system which opeartes by applying suction to a surface of the tape from a stationary hollow brake block positioned adjacent the path of travel of the tape.
  • the degree of suction applied when braking is required, always has the same value irrespective of the particular phase of operation which is being performed by the apparatus.
  • the brake block is disconnected from the suction supply and is connected to a source of pressure by means of a valve.
  • web handling apparatus includes means operable to move a web longitudinally; an open ended reservoir; a suction source connected to the reservoir; means operable in a first phase of operation of the apparatus to feed the web along a first path in which the web is efiective as a barrier between the suction source and atmospheric pressure to produce a first pressure in the reservoir and operable in a second phase of operation of the apparatus to feed the web along a second path spaced from the open end of the reservoir to produce a second pressure in the reservoir; braking means responsive to air pressure in the reservoir and operable in response to said first pressure to apply a first braking force to the web and in response to said second pressure to apply a second braking force, less than said first braking force, to said web.
  • the drawing shows a schematic view of part of a tape handling apparatus.
  • tape handling apparatus includes a pair of capstans 1 and 2 rotating continuously in opposite directions.
  • Pinch rollers S and 6 are positioned adjacent the capstans 1 and 2 respectively and one or other of the pinch rollers is moved electromagnetically to press a magnetic tape 3 against the corresponding capstem 1 or 2 to cause the tape to be moved either forwards or backwards past a transducer head assembly 4.
  • the pinch roller 5 is shown in its operated position pressing the tape against capstan 1 to drive the tape upwardly (in the drawing) past the head 4 whereas pinch roller 6 is shown in the unoperated position.
  • the ends of the tape 3 are wound on reels, of which one reel 7, together with its driving motor 8, is shown in the drawing.
  • a driving force is suddenly applied to the length of tape intermediate the reels.
  • the reels and driving motors have a relatively large inertia and hence stretching or braking of the tape 3 could occur.
  • a loop 9 of tape is provided between each reel and the capstans. The loop 9 is drawn into and held in an open ended reservoir 10 by suction applied by a suction unit 14 to vents 11, 12 and 13 in the Walls of the reservoir 10.
  • control unit 30 which receives signals from tape loop position sensing devices 31, 32 and supplies power to the motor 8 to maintain the tape loop 9 at the desired position during steady movement of the tape and to restore the loop 9 to its desired position immediately after a change in the motion of the tape 3.
  • a guide roller 15 is provided to guide the tape 3 from the reel 7 into the reservoir 10.
  • a pair of guides 28, 29 align the edge of the tape 3 correctly for passage past the head assembly 4.
  • the other end of the tape 3, remote from the reel 7, is wound onto a second reel (not shown) and preferably a second loop is formed .in a second reservoir (not shown) between the capstan 2 and the second reel.
  • a guide roller is provided between the second reservoir and the second reel.
  • the tape loop position sensing devices 31, 32 may be of the type described in co-pending British application Ser. No. 22,616/67 filed May 16, 1967, two sets of apertures 16 and 17 then being provided in the back wall of the reservoir 10 which are connected to ducts (not shown) to cause air flows which vary in dependence upon the tape loop positions relative to the sets of apertures 16 and 17.
  • Thermistors (not shown) are positioned in the ducts so that the air flows act on the thermistors to produce signals indicative of the tape loop position.
  • a loop fault detector 23 connected to the vents 20 and 21, responds to the change in pressure and causes the control unit 30 to shut down the apparatus-
  • the reel motors are controlled so that tape loops occupy a central position in each of the two reservoirs.
  • a fast rewind signal on line 33 causes the control unit 30 to disable the loop faultdetector 23 so that the loop 9 can leave the reservoir 10 without the apparatus shutting down.
  • the tape 3 then takes up a posi-' tion, such as that represented by chain-dotted line 24, in which the tape 3 runs directly from the reel 7, past the pulley 15, over a guide roller 25 and past the capstans 1 and 2.
  • Neither pinch roller 5 or 6 is operated by the control unit 30, the drive for the tape being supplied by the reel drive motors in accordance with a rewind routine such as described in our co-pending British application Ser. No. 22,617/67 filed May 16, 1967.
  • a loop of the tape 3 still remains in the lower reservoir (not shown).
  • a braking force is applied to the tape 3 by a pair of hollow brake blocks 26 and 27 positioned adjacent the head assembly 4. Suction is applied to the interior of the blocks 26 and 27, and these blocks have apertures in a face adjacent the tape 3 so that the suction is applied to the tape 3 and resists movement of the tape. Although this braking force is intended to help the rapid deceleration of the tape 3 when driving force is removed from the tape, it is convenient to apply the suction to the blocks throughout operation of the tape handling apparatus.
  • the tape 3 is thereby subjected to a continuous drag which during a fast rewind operation causes an increase in tape tension. It is essential that tape tension should remain substantially constant whatever phase of operation is being performed by the apparatus, otherwise the tape 3 may be Wound irregularly onto the reels and damage to the tape may result.'Furthermore, at the high rewind speed the suction brakes may cause increased tape wear. It is advantageous, therefore, to reduce the suction during a rewind operation. However, it should not be completely removed. The brake blocks 26 and 27 therefore take their suction supply via the long tape loop detection vent 20 of the upper reservoir 10 (i.e. the reservoir from which the tape 3 is withdrawn during a fast rewind operation).
  • the vent 20 associated with the loop fault detector 23 need not be used for the provision of suction for the blocks 26 and 27.
  • a completely independent vent alongside the vent 20 could be used.
  • the reservoir 10 need not be a folded reservoir as "shown in the drawing but'coul'd' comprise' rn'erely'a' single compartment, provided that'the brake supply vent is correctly positioned in the compartment.
  • the reservoir from which the brake suctionis taken could, alternatively, be an auxiliary reservoir formed inside or outside the main reservoir 10, provided that suction in thefauxiliary reservoir decreases during the rewind phase of operation.
  • suction means other than suction means could be provided for forming the loop 9 in the reservoir 10, suction then being applied to the reservoir 10 specially to provide the required supply for the brake blocks 26 and 27. Although it is preferable to retain a tape loop in one reservoir during a rewind operation, this is not essential.
  • Web handling apparatus including means operable to move a Web longitudinally; anopen ended reservoir; a suction source connected to the reservoir; means operable in a. first phase of operation of the apparatus to feed the web along a first path in which.
  • the web is effective as a barrier between the suction source and atmospheric pressure to produce a first pressure in the reservoir and operable in a second phase of operationof the apparatus to feed the web along a second path spaced from the open end of the reservoir to produce a second pressure in the reservoir; braking means responsive to air pressure in the reservoir and operable in response to said first pressure to apply a first braking force to the web and in response to said second pressure to apply a second braking force, less than said first braking force, to said web.
  • Web handling apparatus as claimed in claim 2 in which the reservoir is of elongate form having one end open and in which the suction source is connected to the reservoir at its other end.
  • Web handling apparatus as claimed in claim 5 in which the braking means includes an element having a perforated face positioned adjacent the web and suction is applied through the perforated force to cause engagement of the web with said perforated face.

Landscapes

  • Advancing Webs (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
US728139A 1967-05-16 1968-05-10 Tape handling apparatus Expired - Lifetime US3512692A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB22618/67A GB1195123A (en) 1967-05-16 1967-05-16 Improvements in Tape Handling Apparatus.

Publications (1)

Publication Number Publication Date
US3512692A true US3512692A (en) 1970-05-19

Family

ID=10182363

Family Applications (1)

Application Number Title Priority Date Filing Date
US728139A Expired - Lifetime US3512692A (en) 1967-05-16 1968-05-10 Tape handling apparatus

Country Status (4)

Country Link
US (1) US3512692A (cs)
CS (1) CS159745B2 (cs)
DE (1) DE1763342C3 (cs)
GB (1) GB1195123A (cs)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3576282A (en) * 1969-06-30 1971-04-27 Ibm Pneumatically biased tape loading
US3819097A (en) * 1972-05-15 1974-06-25 Bleiche Ag Method and an arrangement for controlling the tensioning force in an advancing yarn
US4469265A (en) * 1982-12-17 1984-09-04 Manquen Charles D Tape handling device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3032245A (en) * 1960-04-25 1962-05-01 Gravure Res Inc Apparatus for controlling web tension
US3291410A (en) * 1965-04-30 1966-12-13 Sperry Rand Corp Fluid tape drive system
US3329364A (en) * 1965-02-24 1967-07-04 Ampex Pneumatic tape drive system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3032245A (en) * 1960-04-25 1962-05-01 Gravure Res Inc Apparatus for controlling web tension
US3329364A (en) * 1965-02-24 1967-07-04 Ampex Pneumatic tape drive system
US3291410A (en) * 1965-04-30 1966-12-13 Sperry Rand Corp Fluid tape drive system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3576282A (en) * 1969-06-30 1971-04-27 Ibm Pneumatically biased tape loading
US3819097A (en) * 1972-05-15 1974-06-25 Bleiche Ag Method and an arrangement for controlling the tensioning force in an advancing yarn
US4469265A (en) * 1982-12-17 1984-09-04 Manquen Charles D Tape handling device

Also Published As

Publication number Publication date
DE1763342B2 (de) 1978-06-15
DE1763342A1 (de) 1971-05-27
CS159745B2 (cs) 1975-01-31
GB1195123A (en) 1970-06-17
DE1763342C3 (de) 1979-02-08

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