GB877211A - Improvements in or relating to electrical control mechanism for controlling the speed of a rotatable element - Google Patents

Improvements in or relating to electrical control mechanism for controlling the speed of a rotatable element

Info

Publication number
GB877211A
GB877211A GB854857A GB854857A GB877211A GB 877211 A GB877211 A GB 877211A GB 854857 A GB854857 A GB 854857A GB 854857 A GB854857 A GB 854857A GB 877211 A GB877211 A GB 877211A
Authority
GB
United Kingdom
Prior art keywords
motor
tape
switch
spool
roller
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
Application number
GB854857A
Inventor
David Arthur Chalmers
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB854857A priority Critical patent/GB877211A/en
Publication of GB877211A publication Critical patent/GB877211A/en
Expired legal-status Critical Current

Links

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
    • 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
    • G11B15/46—Controlling, regulating, or indicating speed

Abstract

877,211. Control of several A.C. motors. ELECTRIC & MUSICAL INDUSTRIES Ltd. March 3, 1958 [March 15, 1957], No. 8548/57. Class 38 (3). A suction roller 8a is coupled to a split-phase induction motor 27 for winding-on or unwinding magnetic tape from a spool 8 driven by motor 26. When the spool 8 is being rotated in the winding direction, the motor 27 is driven by the roller 8a and its starting winding is energized from source 28 so that a voltage is induced in the running winding which, upon the speed of the split-phase motor reaching a predetermined value, operates relay 30 to de-energize motor 26. This prevents the linear speed of the tape from becoming excessive as the diameter of the tape on the spool 8 increases. The winding-operation of the motor 26 is initiated by closure of switch 19 due to lateral pressure of the tape in compartment 10 of bin 6, a switch 22 being closed when the lower part of compartment 11 is filled with tape so as to enable motor 26 to remove tape from the compartment 11. When the roller 8a is required to unwind tape from spool 8 into the compartment 11, switch 18 is closed and motor 27 is fully energized. At the same time, relay 30 is energized to disconnect the motor 26. When the switch 18 opens, the motor 26 is energized through resistor 35, and a portion of tape is kept taut between roller 8a and spool 8, a switch 34 opening to de-energize the motor 26 if the roller 8a is caused to rotate in a direction opposite to that obtained when the motor 27 is fully energized. A switch 40 operates to reverse the direction of the tape, the filling and emptying of bin 7 being similar to that of bin 6. Specifications 877,209 and 877,210 are referred to.
GB854857A 1957-03-15 1957-03-15 Improvements in or relating to electrical control mechanism for controlling the speed of a rotatable element Expired GB877211A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB854857A GB877211A (en) 1957-03-15 1957-03-15 Improvements in or relating to electrical control mechanism for controlling the speed of a rotatable element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB854857A GB877211A (en) 1957-03-15 1957-03-15 Improvements in or relating to electrical control mechanism for controlling the speed of a rotatable element

Publications (1)

Publication Number Publication Date
GB877211A true GB877211A (en) 1961-09-13

Family

ID=9854578

Family Applications (1)

Application Number Title Priority Date Filing Date
GB854857A Expired GB877211A (en) 1957-03-15 1957-03-15 Improvements in or relating to electrical control mechanism for controlling the speed of a rotatable element

Country Status (1)

Country Link
GB (1) GB877211A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3420425A (en) * 1965-11-24 1969-01-07 Plessey Co Ltd Information storage devices
US3733019A (en) * 1970-02-17 1973-05-15 Olivetti & Co Spa Tape cassettes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3420425A (en) * 1965-11-24 1969-01-07 Plessey Co Ltd Information storage devices
US3733019A (en) * 1970-02-17 1973-05-15 Olivetti & Co Spa Tape cassettes

Similar Documents

Publication Publication Date Title
GB876221A (en) Improvements in or relating to web transport apparatus
GB877211A (en) Improvements in or relating to electrical control mechanism for controlling the speed of a rotatable element
GB1163257A (en) Constant Tension-Constant Speed Reel Drive
US2708256A (en) Motor slack take-up and tensioning mechanism for travelling flexible member
US2671619A (en) Winding mechanism for magnetic recorders
GB1194771A (en) Improvements in Apparatus for Tension Control of Flexible Materials During Winding or Unwinding Processes
GB1110715A (en) Tape transport system
GB1138398A (en) Tape drive motor control arrangement
US3269670A (en) Tape transporting apparatus
GB1141428A (en) A.c. motor starting arrangement
US4097785A (en) Magnetic-tape-transport apparatus
ES410312A1 (en) Constant tension control system for a dc reel drive motor
GB1205162A (en) Reeling or winding mechanism for cordlike or threadlike material, e.g. wire
US2259115A (en) Control system
US2011371A (en) Control system
GB933862A (en) Improvements in or relating to electric motor control arrangements for use in the transportation of web
US2917252A (en) Tension control apparatus
GB1171428A (en) Improvements in or relating to Differential Braking System for Reeling Apparatus
GB877210A (en) Improvements in or relating to web unwinding mechanism
JPS56139095A (en) Rotating speed control circuit for dc brushless motor
GB1327715A (en) Apparatus for winding and unwinding a tape or the like
GB1077130A (en) Control apparatus,particularly for tape transport
GB877209A (en) Improvements in or relating to web feeding mechanism
GB876543A (en) Electric control systems for tape transport motors
GB934173A (en) Improvements in or relating to electrical apparatus for maintaining a predetermined quantity of an elongated medium at a predetermined zone