US2966389A - Facsimile apparatus - Google Patents

Facsimile apparatus Download PDF

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Publication number
US2966389A
US2966389A US707891A US70789158A US2966389A US 2966389 A US2966389 A US 2966389A US 707891 A US707891 A US 707891A US 70789158 A US70789158 A US 70789158A US 2966389 A US2966389 A US 2966389A
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US
United States
Prior art keywords
scanning device
clutch
motor
yielding
arm
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
US707891A
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English (en)
Inventor
Mason Frederick Percival
Marden Leonard Oswald
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.)
Creed and Co Ltd
Original Assignee
Creed and Co 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 Creed and Co Ltd filed Critical Creed and Co Ltd
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Publication of US2966389A publication Critical patent/US2966389A/en
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L13/00—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00
    • H04L13/02—Details not particular to receiver or transmitter
    • H04L13/04—Driving mechanisms; Clutches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D11/00—Clutches in which the members have interengaging parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/50—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members
    • F16D3/60—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members comprising pushing or pulling links attached to both parts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/06—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using cylindrical picture-bearing surfaces, i.e. scanning a main-scanning line substantially perpendicular to the axis and lying in a curved cylindrical surface
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/15—Intermittent grip type mechanical movement
    • Y10T74/1502—Escapement

Definitions

  • FACSIMILE APPARATUS Filed Jan. 9. 1958 Inventor E Mason- 1.,0. Ma rd y C Attorney United States Patent Ofiice 2,966,389 Patented Dec. 27, 1960 FACSIMILE APPARATUS Frederick Percival Mason and Leonard Oswald Marden, Croydon, England, assignors to Creed & Company Limited, Croydon, England, a British company Filed Jan. 9, 1958, Ser. No. 707,891 Claims priority, application Great Britain Jan. 14, 1957 4 Claims. (Cl. 346-138) This invention relates to facsimile apparatus.
  • a facsimile scanning device e.g. a drum
  • the present invention provides an improvement in apparatus designed with this object in view.
  • a synchronous motor to drive a shaft at a constant speed
  • a rapidengagement clutch to be provided to couple a scanning device, usually a drum, which is reposing at rest in a known angular position, to the rotating shaft at an instant related to the phase position of the scanner of a co-operating machine.
  • the rapid-engagement clutch is of a type which will engage positively for rotation in' both directions, e.g. a dog clutch.
  • the rapid-engagement clutch it is also usual for the rapid-engagement clutch to embody or be used in association with a compliant link or yielding member interposed between the clutch and the scanning device.
  • the compliant link then limits the torque load applied to the synchronous motor at the instant of engagement of the clutch to a value such that the motor is not pulled out of synchronism.
  • the compliant link therefore yields at the moment of engagement of the clutch and, because the speed of the scanning device is for some time lower than that of the motor, continues to yield until the speed of the scanning device is the same as that of the motor.
  • the scanning device is not being driven at the correct phase, when it reaches the correct speed. This is corrected by the compliant link contracting and advancing the scanning device to the correct phase position. During this advance the scanning device is accelerated to a higher speed than that of the synchronous motor.
  • the kinetic energy of the scanning device may cause the clutch to slip or the motor to exhibit a negative slip, or both, and correct rotational phase of the scanning device to be lost.
  • a second yielding member (which will be referred to as a compliant member) designed to absorb sufiicient of the force exerted by the kinetic energy of the scanning device to prevent any clutch or motor slip.
  • a compliant member designed to absorb sufiicient of the force exerted by the kinetic energy of the scanning device to prevent any clutch or motor slip.
  • facsimile apparatus comprising a first member arranged to be driven continuously from a motor, rapid-engagement clutch means, which will engage positively both for rotation in the direction in which said first member is driven and for rotation in the reverse direction, for coupling a second member substantially instantaneously to said first member, a scanning device arranged to be driven through said second member, yielding means interposed between said clutch means and said scanning device for limiting the forces applied by said scanning device to said clutch means and said motor, and a braking device effective to bring said scanning device substantially asymptotically to a position of rotation in which said yielding means is in a condition similar to that occupied thereby when said clutch means is disengaged and said scanning device is at rest.
  • the substantially asymptotic approach of the scanning device to the correct position of rotation may be defined as the reduction of the relative velocity between the scanning device and the motor to zero substantially at the instant when the phase displacement between the two becomes zero.
  • the braking means must provide a braking torque, between the scanning device and the motor, which torque is directly proportional to the relative velocity between the scanning device and the motor.
  • the asymptotic approach to the correct phase position may be achieved in one of two ways. First, it may be achieved by making the braking device operative when the compliant link is contracting from its expanded position. Alternatively, the compliant link may be allowed to accelerate the scanning device through the scanning position as described above, and the braking device arranged to be operative when the second yielding member, i.e. the compliant member, is returning the scanning device to the correct phase position.
  • the braking device will have to be operative when the scanning device is travelling slower than the motor driving it. This is the same condition that exists when the scanning device is being started from rest and it has to be arranged that the braking device is not operative then.
  • the difference between the two conditions is that, when the braking device is required to be operative, the scanning device is ahead of its correct phase position, and, when the apparatus is starting from rest, the scanning device is lagging behind its correct phase position.
  • the braking device is arranged to be dependent on the direction which the compliant link (or first yielding member) is being stressed.
  • a synchronous motor 1 continuously drives a shaft 2.
  • the engagement of a positive clutch 3 at a specific instant causes shaft 4 to rotate at synchronous speed with the motor shaft 2.
  • the positive clutch 3 may, for example, be a dog clutch, but should, in any event, be a clutch which engages positively for rotation in both directions.
  • the shaft 4 terminates in an arm which carries a yielding abutment pin 6, a spring anchor 7, a pivot pin 8, and a spring anchor 9.
  • To spring anchor 7 is attached one end of a spring 10, the other end of which is attached to a spring anchor 11, carried by an arm 12.
  • the pivot pin 8 carries a toothed arm 13, which is kept in engagement with a ratchet wheel 14 by the action of a spring 15 connected between the arm 13 and spring anchor 9.
  • the wheel 14 is free to rotate upon a spindle 16 attached to arm 12.
  • the speed at which wheel 14 can rotate is limited by the action of the mass of an escapement lever 17' which can oscillate upon a pivot pin 18 carried by arm 12.
  • the system 13, 14 and 17 constitutes the braking device.
  • the arm 12 is attached to a spindle 19, which carries a facsimile device such as the usual rotatable scanning drum 2%.
  • the arm 12 is normally maintained in contact with the abutment pin 6 in an unyielded position thereof by the tension of the spring 1%.
  • the spring corresponds to the compliant link or first yielding member referred to in the above discussion, while the yielding abutment pin 6 corresponds to the compliant member or second yielding member.
  • the action of the mechanism is as follows:
  • This speed may be chosen by suitable design of the system 13, 14 and 17 so that the movement caused to yielding pin 6 by the lever 12 is very small.
  • the drum 20 is therefore not slowed down substantially below its synchronous speed at all.
  • Facsimile apparatus comprising a first member arranged to be driven continuously from a motor, automatic engagement clutch means, which will engage positively both for rotation in the direction in which said first memher is driven and for rotation in the reverse direction, for coupling a second member substantially instantaneously to said first member, a facsimile device, coupling means interposed between said clutch means and said facsimile device for coupling said facsimile device to said second member, said coupling means including yielding means for limiting the forces applied by said facsimile device to said clutch means and said motor, said coupling means further including a braking device for damping the said yielding means, said yielding and said braking means cooperating to bring said facsimile device substantially asymptotically to a position of rotation in which said yielding means is in a condition similar to that occupied thereby when said clutch means is disengaged and said facsimile device is at rest.
  • Facsimile apparatus as claimed in claim 1, in which said braking device comprises an energy dissipating escapement device.
  • Facsimile apparatus as claimed in claim 1, in which said facsimile device is a message-supporting drum.
  • Facsimile apparatus as claimed in claim 1, wherein said yielding means includes a compliant link which ex: pands on engagement of said clutch means, and wherein the said braking means is effective on contraction of said compliant link to exert a braking force on said facsimile device dependent on the difference in angular velocity between said motor and said facsimile device.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Braking Arrangements (AREA)
  • Mechanical Operated Clutches (AREA)
  • Facsimiles In General (AREA)
US707891A 1957-01-14 1958-01-09 Facsimile apparatus Expired - Lifetime US2966389A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB359157X 1957-01-14

Publications (1)

Publication Number Publication Date
US2966389A true US2966389A (en) 1960-12-27

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ID=10382968

Family Applications (1)

Application Number Title Priority Date Filing Date
US707891A Expired - Lifetime US2966389A (en) 1957-01-14 1958-01-09 Facsimile apparatus

Country Status (6)

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US (1) US2966389A (US20030220297A1-20031127-C00033.png)
BE (1) BE563941A (US20030220297A1-20031127-C00033.png)
CH (1) CH359157A (US20030220297A1-20031127-C00033.png)
DE (1) DE1110210B (US20030220297A1-20031127-C00033.png)
FR (1) FR1189064A (US20030220297A1-20031127-C00033.png)
GB (1) GB818903A (US20030220297A1-20031127-C00033.png)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3505472A (en) * 1966-01-12 1970-04-07 Magnavox Co Facsimile synchronizing system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2683514A (en) * 1950-11-20 1954-07-13 Flight Res Inc Synchronous control device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2683514A (en) * 1950-11-20 1954-07-13 Flight Res Inc Synchronous control device

Also Published As

Publication number Publication date
BE563941A (US20030220297A1-20031127-C00033.png)
FR1189064A (fr) 1959-09-29
GB818903A (en) 1959-08-26
CH359157A (de) 1961-12-31
DE1110210B (de) 1961-07-06

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