FR2452452A1 - Refinement to drive mechanism of film or tape reels - provides electromagnetically operated controlled braking of reel spindles - Google Patents

Refinement to drive mechanism of film or tape reels - provides electromagnetically operated controlled braking of reel spindles

Info

Publication number
FR2452452A1
FR2452452A1 FR7907894A FR7907894A FR2452452A1 FR 2452452 A1 FR2452452 A1 FR 2452452A1 FR 7907894 A FR7907894 A FR 7907894A FR 7907894 A FR7907894 A FR 7907894A FR 2452452 A1 FR2452452 A1 FR 2452452A1
Authority
FR
France
Prior art keywords
spindle
film
brake
braking
refinement
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.)
Pending
Application number
FR7907894A
Other languages
French (fr)
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.)
PRESTINOX SA
Original Assignee
PRESTINOX SA
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 PRESTINOX SA filed Critical PRESTINOX SA
Priority to FR7907894A priority Critical patent/FR2452452A1/en
Publication of FR2452452A1 publication Critical patent/FR2452452A1/en
Pending legal-status Critical Current

Links

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
    • 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
    • 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
    • G11B15/22—Stopping means
    • 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
    • G11B15/32—Driving record carriers by members acting directly or indirectly thereon through the reels or cores on to which the record carrier is wound

Abstract

Spindles driving film or tape recorder reels are individually driven by dc electric motors fed from a system giving the voltage and current required for best combination of speed and tension of the film or tape. A gear train couples the motor to the reel spindle. A ferromagnetic disc mounted on the spindle via splines is free to slide along the spindle and is normally held away from the electromagnetic brake, mounted coaxially with the spindle, by a spring. When the spindle drive motor supply is interrupted the electric supply to the electromagnetic brake is imitated, drawing the braking disc along the spindle and into contact with the stationary part of the brake. The braking force may be varied by variation of the electromagnet supply which is dc with a superposed 100Hz component to provide extra hysteresis braking and to ensure no residual magnetism when the brake is released.
FR7907894A 1979-03-29 1979-03-29 Refinement to drive mechanism of film or tape reels - provides electromagnetically operated controlled braking of reel spindles Pending FR2452452A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7907894A FR2452452A1 (en) 1979-03-29 1979-03-29 Refinement to drive mechanism of film or tape reels - provides electromagnetically operated controlled braking of reel spindles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7907894A FR2452452A1 (en) 1979-03-29 1979-03-29 Refinement to drive mechanism of film or tape reels - provides electromagnetically operated controlled braking of reel spindles

Publications (1)

Publication Number Publication Date
FR2452452A1 true FR2452452A1 (en) 1980-10-24

Family

ID=9223702

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7907894A Pending FR2452452A1 (en) 1979-03-29 1979-03-29 Refinement to drive mechanism of film or tape reels - provides electromagnetically operated controlled braking of reel spindles

Country Status (1)

Country Link
FR (1) FR2452452A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5346155A (en) * 1992-04-30 1994-09-13 Minnesota Mining And Manufacturing Company Belt driven cartridge with magnetic brake assembly
US7007779B2 (en) 2002-09-11 2006-03-07 Siemens Aktiengesellschaft Electromagnetic brake assembly and power supply

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153515A (en) * 1962-03-15 1964-10-20 Scully Recording Instr Corp Differential braking system for tape transport mechanism
FR1383894A (en) * 1963-10-30 1965-01-04 Olympia Werke Ag Winding and unwinding device for recording media such as tapes
DE2450399A1 (en) * 1973-10-23 1975-04-24 Stutz William H FILM TRANSPORT DEVICE WITH STEPPER MOTOR
CH593490A5 (en) * 1975-01-15 1977-12-15 Elf Aquitaine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153515A (en) * 1962-03-15 1964-10-20 Scully Recording Instr Corp Differential braking system for tape transport mechanism
FR1383894A (en) * 1963-10-30 1965-01-04 Olympia Werke Ag Winding and unwinding device for recording media such as tapes
DE2450399A1 (en) * 1973-10-23 1975-04-24 Stutz William H FILM TRANSPORT DEVICE WITH STEPPER MOTOR
CH593490A5 (en) * 1975-01-15 1977-12-15 Elf Aquitaine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5346155A (en) * 1992-04-30 1994-09-13 Minnesota Mining And Manufacturing Company Belt driven cartridge with magnetic brake assembly
US7007779B2 (en) 2002-09-11 2006-03-07 Siemens Aktiengesellschaft Electromagnetic brake assembly and power supply

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