US1759303A - Method and means for the transmission of pictures and the like - Google Patents

Method and means for the transmission of pictures and the like Download PDF

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Publication number
US1759303A
US1759303A US271296A US27129628A US1759303A US 1759303 A US1759303 A US 1759303A US 271296 A US271296 A US 271296A US 27129628 A US27129628 A US 27129628A US 1759303 A US1759303 A US 1759303A
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Prior art keywords
drum
pictures
revolution
relay
picture
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US271296A
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English (en)
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Fulton Otho
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Individual
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Individual
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    • 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
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/36—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device for synchronising or phasing transmitter and receiver

Definitions

  • This invention relates to, improvements in and connected with methods of and means for the long distance transmission of pictures, diagrams and other impressions.
  • the various systems known consist of a rail, adjusted in parallel with and alongside of the drum axis, for carrying the traveling recording pin or feelmg device which is connected compulsorily with the driving shaft of the drum by means of a suitable traverse.
  • a screwed spindle efiecting the longitudinalmovement either of the recording pin, or of the cylinder is connected with an extension of the cylinder, so as to simplify the construction and to increase the reliability of the apparatus.
  • These systems need an arrangement for producing synchronism between the transmitter and the receiver. It is further knownthat in various modes of long with these known methods to employ. syn;
  • chronizing arrangements including 'a relay at'the receiving end which is put inaction by I ⁇ he transmitter at the conclusion of a picture -,1ne.- v
  • I 'Anotherfeatureof th'iS f invention is an improvement'jof the arrangement for moving the stylusf'vor other such device in relation to the drum in ⁇ the direction of its. axis.
  • Us- --uallythe ycylinder and thefs'pin'dle have a I common-axis, and" the stylus is carried on a i I I "spiraliscanning of, the transmitter "011 or ⁇ ?
  • the .successive current impulses will be therefore longer or shorter, and will act accordingly at the receiving end.
  • the number of the picture elements to be transmitted that is to say the fineness of the screen used, is dependent on the advance or feedof the stylus, that is to say on the pitch of the screw-threaded spindle used for the purpose. If the number of threads per unitof length is. increased, all other conditions remaining equal, there will 2Q take place a considerable lengthening of .the
  • the transmitting apparatus is op-' maining inaction.
  • the relay releasing the sto ping or locking device at the receiver en and thus insuring equable characteristic of movement (snychronization) during the time of one period of utilization, if the apparatus at the transmitter and at the receiver are simultaneously started and are driven by motors of equal power.
  • the couplings used between the motor and the feeler or scanning device should also run equally.
  • the invention solves the problem of improvement of such couplings used in the pic ture transmission apparatus, in such manner that, all the above mentioned drawbacks are eliminated, that is to say the driving motor is no longer braked, .and on the other hand, whilst avoiding as far as possible expensive constructional elements, great constancy with even veryweak and therefore cheap driving motors, for instance spring mechanisms, can
  • a magnetic coupling is utilized in such manner that it acts as a rigid coupling only when the transmission of a torque is desired ;:in the other case however, that is to say during the time of locking of the writing device, the coupling is completely disconnected so that the driving gear does not have to perform any frictional work.
  • the coupling is also automatically operated again, namely, in such a manner that the parts to be driven, are at once put in motion, without risk of any slipping.
  • the necessary instantaneous forces of acceleration are also supplied by a weak driving motor, provided that the constructional elements to be driven are correctly proportioned.
  • an improveobtained' by transferring the metal contact extending throughout the-whole width of the transmitter cylinder, so that it constitutes the devicewhich is'used for mechanically securing or fixing the transmitter foil to the cylinder.
  • contact strip could bemade very accurately and of sufficient mechanical strength.
  • a relay which is operated by the incoming current impulse and thereby produces synchronization in any desired-manner by makinga suitable contact, for instance, for the release of a locking device for writing drum of the receiver.
  • an improvement is effected in such an arrangementby making the connection, when using relays, in such a manner that the relay. is normally short circuited, and is switched into the picture circuit only immediately before the incoming current'impulse.
  • This ensures that the resistance and the inductivity of the sen- ,sitive, and therefore mostly high ohmic relaysynchronization on account of atmospheric" disturbances in-the case ofwireless transmis sion is greatly reduced, and moreover in the event of any getting out of step during a period of synchronization, phase coincidence will be obtained again in a reliable manner. .at the next period.
  • FIG. 1 is a plan view somewhat diagrammatic of one form of scanning and recording device
  • Fig. 2 is a diagram illustrating the electrical connections of the recording device shown in Fig. 1;
  • Fig. 3 is a diagram illustrating the electrical connections for the magnetic clutch, and mechanism actuated by the synchronizin" signal
  • Fig. 4 is a side View of the stop mechanism
  • Fig. 5 is a plan view of the stop mechanism.
  • Figure 1 shows one mode of construction of the scanning and of the recording appliances.
  • S is a spindle mounted in the bear Zngs L, and L,, the drum Z bearing'the recording surface, being coaxial and joined therewith.
  • the spindle and drum arerestrained
  • the stylus P is mounted on a carriage ⁇ V to be movable par- 1 allel with the drum Z.
  • the carriage carries wheel R, which engages in the threads or grooves of the spindle. If the whole arrange- 'anent W moves from the right to the left, the
  • relay R works a contact K which closes a local battery circuit for removing a stop H and thus releasing the drum.
  • the relay R is mechanically so inert, or electrically so retarded, that, even while transmitting half-tints which ought to be dividedup into their s'eparate'elements by means of a suitable screen, it permanently remains attracted and consequently sistance of contact K if, at the same moment, the scanning device at the transmitting end, starts a new picture line.
  • Figure 3 schematically shows one mode of construction of electromagnetic coupling for obtaining better synchromzation.
  • magv net M is made preferably in the form ofa flat pet magnet, and the'armature A, in the form of a disc arranged opposite it and prevented from rotating an the spindle by a tappet N.
  • One end of the winding of the magnet. M is the circuit leading from the battery C- through a group of spring-contacts, controlled by suitable cams or the. like, and
  • the magnet M and the ring S are mounted on one and the same sleeve which is loosely rotatable on the spindle A which at the same-time also carries the gear wheel D effecting the driving, so that at the moment when the magnet M is energized by current, the armature A and owing to the tappet or driver N, also'the spindle A and all the parts secured to it, will begin to rotate.
  • the ring S which is con stantly connected with the body, is provided at a single point with an insulating part I which, in the position of rest; that is to say when the stop H engages with the armature B, is situated under the brush E.
  • the contact K is short circuited through the brush E and the ring S so that the coupling always remains operative, even when the relay R and therefore, through the magnet M the armature B, and the contact K are not operated.
  • the magnet M and the armature A are made ,of a suitable material, the forces between the two parts will cease to act at the moment when respectively.
  • a further improvement in this apparatus relates to the locking device.
  • FIG. 4 A construction of the apparatus. according 40 to this part of the invention is diagrammatically illustrated by way of example in Figures 4 and 5, in elevation and in side-view To the rotatable arts of the apparatus is connected the disc which is provided at one point with a recess P into which fits thecorrespondingly shaped projection N This projection is secured to the armature B which is mounted for instance on a spring F; in front of the armature, is arranged the magnet M which eflects the release in accordance with the preceding description of the coupling.
  • a device for the electrical reception of pictures comprising means for receiving both picture signals and synchronizing signal, a rotating receiving drum, and drlving means therefor, an electromagnetic clutch which is electrically energized to couple the receiving drum'to the driving means, means for stopping the receiving drum at the completion of each revolution, means operated by the synchronizing signal for releasin the receiving drum at the commencement 0 each revolution and for energizing the said clutch, other means for maintaining the clutch electrically energized throughout substantially the remainder of the revolution while the picture signals are being received and means operated by the picture signals for receiving a picture.
  • a device for the electrical reception of pictures comprising means for receiving both the picture signals and the synchronizing signal, a rotating receiving drum and driving means therefor, an electric magnetic clutch for coupling the receiving drum to the driving means, an electric magnetic device comprising a movable armature constituting a stop for the receiving drum at the com'pletion'of each revolution, means for energizing said electromagnetic device to withdraw the stop and release the receiving drum at the commencement of each revolution, electric contacts operated by the movement of the armature in releasing the drum to close the energizing circuit of the electromagnetic clutch, other means for maintaining said cir-' cuit closed during substantially the remainder of the revolution of the drum, and means operated by the p'icture signals for reproducing a picture.
  • Receiving apparatus for transmitted pictures comprising a rotatable drum, means cooperatin with't edrum to reproducethe transmitte picture, drivin means for the between. the drum and the driving means, a
  • 'and'switch contact means operated by the rotation of the formaintaining the 'drum, an electromagnetic, c utch interposedclutch energized during substantially the remainder of a revolution after the synchronizing signal has ceased.
  • a device for the electrical reception of pictures comprising a drum for holding a sensitized body, a stylus coacting with the sensitized body, a continuously rotated element, an electricaloclu'tch between the continuously rotated lement'and the drum included in an electrical circuit, means for stop.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
US271296A 1927-04-12 1928-04-19 Method and means for the transmission of pictures and the like Expired - Lifetime US1759303A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT1759303X 1927-04-12

Publications (1)

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US1759303A true US1759303A (en) 1930-05-20

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BE (1) BE350335A (en))
FR (1) FR656662A (en))

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Publication number Publication date
BE350335A (en))
FR656662A (fr) 1929-05-15

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