US2435250A - Inside scanning facsimile recorder - Google Patents

Description

Feb. 3, 1948. w. s. TANDLER ET AL INSIDE SCANNING FACSIMILE RECORDER Filed Feb. 25, 1944 5 Sheets-Sheet l INVENTOR.

4M1! ,r fimm 1948. w. s. TANDLER ETAL INSIDE SCANNING FACSIMILE RECORDER Filed Feb. 25, 1944 3 Sheets-Sheet 2 INVENTORS W. S. TANDLER BY D. S. WALKER.

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ATTO N EY 1943- w. s. TANDLER EI'AL INSIDE SCANNING FACSIMILE RECORDER Filed Feb. 25, 1944 3 Sheets-Sheet 3 INVENTORS w. s. TAN DLER D. 3. W L K E R ANY ATTO NEY Patented Feb. 3, 1948 INSIDE SCANNING FACSIMILE RECORDE William S. Tandler and David S. Walker, New w York, N. Y., assignors, by mesne assignments, to The Western Union Telegraph Company, New York, N. Y., a corporation of New York Application February 25, 1944, Serial No. 523,824

12 Claims. 1

This invention relates to a facsimile system for the transmission of written messages.

The invention is particularly adapted to satisfy a requirement for which there exists a pronounced need and that is inter-office communication in writing.

Most inter-office communication systems are of sound or loud speaker type and they transmit only oral messages.

While the advantages of this system are apparent, because it permits communication between oifice members and employees without having to move from one room to another and without the requirement of a receiver, its drawbacks are quite numerous.

Loud speakers disturb the office work. If there is noise, they have to drown out this noise in order to be audible; they require immediate attention, interrupting the work. If the person to whom a message is addressed is not present, the message must be repeated at a later time, sometimes several times, and lines are kept busy with such incomplete calls. No permanent record exists.

Most messages transmitted by inter-office communication systems are short; very often they consist of figures only, such as orders, reports on stock available, blueprint numbers and the like. With a facsimile system these messages are transmitted in writing; the sender writes down the message and keeps a record of what he transmits; the receiving end obtains the message in writing, therefore, also has a permanent record available. Noises exert no influence on the transmitting procedure, on the other hand, no noise is produced; therefore, the ofiice members and employees are not disturbed; the receiving party may be absent from his working place or desk and still obtain the message without the necessity of additional calls. If the receiving party is busy at the time when the message comes in, he or she need not interrupt the work in order to listen, but may wait until it is convenient, to read the message and, if necessary, transmit the answer.

While, in oral systems, the lack of a' facility to transmit pictorial messages, such as sketches or drawings, is badly felt, the facsimile system permits telereproduction of sketches, drawings, marks and similar messages which is extremely helpful and time saving. Another great advantage resides therein that secrecy i preserved, while an oral message transmitter, such as a loud speaker is audible to everybody. This is particu- (Cl. IVS-6.6)

larly important when visistors or strangers are present or in oflices where a certain secrecy is required, for instance, in doctors, lawyers, stockbrokers ofiices.

Therefore, there is a great need and demand for a system permitting short distance and interoflice communication of written messages and the savings in time, the elimination of misunderstandings and the annoyance caused by disturbance of other people and of long waiting periods, in case the party addressed is absent, are of great importance,

However, this type of an interofiice communication system will comply with all requirements and be practically useful only if it is simple, sturdy, fast-working, inexpensive, reliable and practical.

While there is a great number of systems available that might serve the aforesaid purpose, it may well be said that none of them combines all of the recited advantages and avoids all the disadvantages.

However, in order to secure the full advantage and efiiciency of a facsimile system of the above recited type the manner in which the message carrier both for scanning and for reproducing purposes is employed, is of paramount importance; unless it is very simple to transmit and receive a message without impairing its reliability, the system is not practical. Furthermore, if a method is available to simplify the handling of the message carrying paper, but a system is used that is so complicated that it would create service problems and increase the costs considerably, it is obvious that its use for the instant purpose would be very much limited, if not completely excluded.

As a photoelectric scanning system is preferably used for the purposes of this invention, it might be useful to refer to some of the various methods in use for scanning the paper which carries the message.

Ordinarily a square sheet of paper is wrapped around a cylinder; while the paper carrying cylinder rotates, the scanner moves along a helical track. In the performance of this method, individual sheets of paper must be cut and applied to the cylinder and taken off after use. This is not only a lengthy procedure, but also one that requires considerable skill and attention. Carelessness in applying the paper sheets results in poor transmission and very often renders the message unintelligible.

To eliminate this great drawback a system using a continuous paper supply has been devised, where a paper tape proceeds during the scanning at a slow speed while the scanner is moved acros the tape by a reciprocating motion at a very rapid speed, in order to scan the paper line by line. This method introducing the reciprocatingaction of the scanner has a very great disadvantage because due to the mass of the scanner and the inertia of the reciprocating parts an apparatus complying with practical require ments is diilicult to be built; besides, a device of this type is limited to comparatively lowspeeds. It must also be borne in mind that whatever movement is effected by the-scannerhasto be duplicated by the scriber and thetwo movements have to be synchronized. Now, .itis particularly 'difiicult to synchronize oscillating or reciprocating movements at high speedsand distortion of the messages must result. In spite of the advantages due to the use of a continuous message carrier, the drawbacks of an oscillating scanner are so great that this system vhas reached only a rather limited practical application.

In facsimile systems not based on photoelectric or contact scanning or prewrittenmessages a mechanical electrical system is provided with which the scriber is connected at the transmitting end and a corresponding motion is effected at the receivingend of the scriber.

This system requires considerable electrical installation; while it has the advantage of an immediate but slow transmission'of the message compared to a 'slight delay such as in the scanning method, it has the great disadvantage of embodying the writing movement of the-sender as well as the fact that the message is transmitted simultaneously with the writing; neither corrections nor rewriting of the message is possible. These-complicated-systems are exceedingly sensitive to shock and rough handling;-they further require careful upkeep of the-:scribers; furthermore, considering the human element'involved in this type of communication, th y are only suitable for a certainpercentage of users who can adjust their writing to the intelligence level which these systems requirey'jerky: and erratic script cannot be transmitted properly.

The elimination of all of the above recited drawbacks in combination with utmost .constructional simplicity, operating reliability and sturdiness of a facsimile system is a maincbject of this invention.

It is another object of the-same to eliminate those difficulties which are causedby the introduction, the straightening and the adjustmentof individual message sheets.

In connection therewith it is an objector this invention to render the telescriber usable-for unskilled and unattentive operators, without however in the least impairing the accuracy and reliability of the message production.

It is another object of :the invention to provide facilities by which the message after being'written may be corrected, thewriting maybe stopped entirely or may be written with'anywritingimplement and any desired speed dependent Ion the skill and habits of the writer.

It is also .ancbject of the invention to secure a permanent record of the messages written'at the transmitting end and delivered .to thereceiving end.

It is an important object of the invention to provide a facsimile device which is particularly suited for inter-'oifice' communicationfthat is, a communication of prewritten messages from one principle and spirit of the invention, as it is more 15-- particularly claimed hereinbelow.

In the drawings,

Figs. 1 and 2 constitute the transmitter, Fig. 1' being a vertical elevation taken on line l--l of Fig. 2, some of the parts of Fig. 2 being for claritys-sake shown in an out-of-center position,

- Fig. 2 being a vertical .longitudinalelevation taken on line 2-'-2 of Fig. 1,

Figs. 3 and 4 constitute the receiver,

Fig. 3 being a vertical elevation taken on line 33 of Fig. 4,

Fig. 4 being a vertical longitudinal elevation taken on line 4-4'of Fig. 3.

In order to simplify and to clarif the illustrative showing of the invention, certainparts more specifically mentionedbelow are shown in either of the two elevations only.

Furthermore, the term messagefrequently used in the following description and claims is to include any type of script applied to the message carrier, pictorial matter, sketches, drawings, etc.

In Figs. 1 and. 2, A denominates a frame structure supported on two stands I, 2. -Guide rods '3, 4 are mounted-in this frame; these guide rods are only shown in Fig, 1 and-not in Fig. 2.- A carriage 5 having a cylindrical center portion 6 is slidably supported upon these guide rods. A worm 1 located in frame A displaces carriage:5 in the longitudinal direction, a-half-nut 8 bein g'for this purpose associated with carriage 5 which nut meshes with worm I.

Half-nut 8 is located on lever B which is journaled in bearing I0 suitably mounted on the transmitter frame A and pressed in 'theposition shown in .full'lines into Worm 1 by spring II. This full line-positionsignifies the transmitting stage, denominated by T at switch- 6|, whereas S signifies the stand-by or inoperative position; in the latterposition the current is closed,- asshown indotted lines, and the solenoid I2 which is-connected by leads 45b, 450 to the :current supply disengagesthe nut 8 from the worm.

Worm l is connected-to dog clutch' member I5, which meshes with'dog =clutch'member l6;1the latter is of the'movable type'and actuated by lever I! which in'turn tends'to rotate in a clockwise direction under the influence ofspring l8; the spring holdsclutch 15, 16 in-engagement, as shown in full lines, unless solenoid i8 is energized and lever I l is-moved in the counterclockwise 13 of an optical scanning system. Tube 23 rotates 'inbearingS' 24 and25 located'in frame A; the

opticalsystem consists of a. condenser lens 26, a

mirror 21' and objective len 28, all encased by tube 23.

A stationary tubular housing 30 is situated adjacent to tube 23. This housing 30 contains a light source 20 which by means of lens 3| and mask 32 projects a light beam into the above referred to optical system; when passing through lenses 25, 20, the light beam concentrates a small light spot on the outside of cylinder 0. This cylinder is made of glass or some other transparent material and is connected with carriage 5. If paper 33 is supported on cylinder 5, light projected onto the cylinder is reflected or dispersed therefrom and the reflected or dispersed light will pass to photocell 34. In scanning the message from the inside and through a transparent drum the problem of light reflection from this transparent drum and resulting distortion offers a serious and diflicult problem. The way this problem has been solved in the instant case is as follows:

The light beam of the projector lamp 29 which is placed outside the optical system is reflected by mirror 21 so that it strikes at a substantially right angle against the walls of the transparent cylinder 0. Thus the light beam penetrates without deflection. The light is not reflected in the usual sense onto the cell 34 and under abstract conditions true light reflection would not occur at all; however, dispersed light is reflected from the paper through the cylinder at a suflicient rate; this dispersed light is relatively strong when reflected from a light surface and comparatively weak when reflected from dark surfaces. The difference suffices to actuate the photoelectric cell 34 which is placed inside the drum 6 in close proximity to the mirror 27 and the optical system. It is, therefore, characteristic that not direct but indirect reflection or dispersion is an operating principle of the instant scanning system.

It may here be noted that facsimile transmiting systems using a rotational optical scanner positioned inside of a transparent cylinder around which the subject copy is wrapped are known and no claim is presented for this type of equipment as such.

A lead 35 connects the photocell with contact blade 35 which by insulated mounting means is located in housing 31 and connected to amplifier 38. The design of this contact is such that when tube 23 rotates driven by gear train 2|, 22 the contact with lead 35 is maintained and impulses received by the photocell from light reflected from paper 33 are carried through contact 36 to amplifier 33.

The amplifier is in turn coupled to line 45 through blocking condenser 35a which permits the alternating current signal impulses to pass, but prevents the D. C. control voltage of the solenoids from feeding into the amplifier. The solenoids have a high impedance to the alternating current and are, therefore, not affected by the signal current.

Also mounted on worm I is disc 39 to which a catch 40 is attached which can be brought into contact with stop lever M. This stop lever is pivoted at 42 and is held. during the transmitting stage in the inoperative position by spring 43, shown in full lines. If, however, solenoid 44 is actuated to reestablish the stand-by stage S, stop lever 40 is turned in counterclockwise direction and will engage catch 40 of disc 39, thus preventing worm i from rotating beyond the point of engagement; this position of the catch'is shown in dotted lines.

A paper roll 46 forming a continuou message carrier is mounted in frame A; it holds a suflicient supply of paper 33 which is drawn over rollers 41, 48, 40, cylinder 6 and roller 50 until it is engaged by wheel 5I which in coaction with a roller 52 is capable of drawing the paper off the roll 46 and through the transmitter, so as to form a loose end 53 which may be torn off again or again wound into a roll, to secure a permanent record.

Between roller 41 and 48 a support or pad 54 is provided which supports the paper strip when a message is written or a drawing i made b means of pencil 55 on the portion of the paper strip 33, situated on the support.

Light coming from the light source 29 creates a light spot 02 which is reflected or dispersed from the circumference of the drum 5 onto the photocell 34. Ratchet 56 is rotated by pawl 51 which is actuated by solenoid 58 connected with lead 45a, and kept in engagement with the ratchet by spring 50. A gearing, not shown, is provided between drum 5! and ratchet 50 by which drum 5| will turn a part or full or more than one revolution, if ratchet 55 is moved one tooth; pawl 51 is actuated by solenoid 58 connected to lead 45a and held against ratchet 55 by spring 5811. 7

Figures 3 and 4 show the receiver which by leads 60a, I051) is connected with lead 60 of the transmitter; a frame B supported on stands IOI and I02 carries by means of bearings I03 and I04 a rotatably mounted drum I05 having slotted wall portion I06. Mounted on drum I05 is gear I01 which meshes with gear I08 Below and I09 above. Mounted axially inside the drum is a cored shaft II!) which is rotatable as well as slidable in a longitudinal direction within drum I05. The solid end of shaft H0 is constructed as a worm III which during the transmitting stage T, shown in full lines, meshes with half-nut II2; this half-nut is mounted on a lever I I3 pivoted at H4 and held in the transmitting position by spring IIS, but is capable of being moved out of engagement with worm III, as shown in dotted lines, by energizing solenoid II5 which is connected by leads I350, I361) to the D. C. current source.

Attached to shaft I I0 is a short tubular member I I I which with its outer end engages with slot I00 of drum I05 in such a Way that when drum I05 is rotated through gear train I01 and I08, shaft I I0 is rotated in the same direction by the engagement of member In and slot I06. If at this time half-nut H2 is in engagement with worm III, then cored shaft IIO will have imparted to it a longitudinal movement parallel with the axis of drum I05.

Inside of and insulated from tubular member III a fine Wire I40 is mounted capable of touching at a point I49 the paper H8 supported on drum I05. This wire serves as a contact and is connected by lead II9 to contact I20 which is mounted inside housing I2I and held by cable I22 so that when hollow shaft II 0 and drum I05 are rotated, contact is maintained between lead I I9 and contact I20,

Gear I08 is mounted on shaft I23 and on the same shaft is mounted in 'a fixed position clutch member I24 meshing with clutch member I25; the latter is of the movable type and is actuated by lever I25 in a manner similar to clutch member I'I shown in Fig. 2. A spring I21 maintains the clutch in the transmitting position, shown in full lines; if energized by switch BI, Fig, 2, solenoid I28 connected to lead I35b will disconnect the clutch, as shown in dotted lines.

A continuously rotatingmotor- I29 is provided to drive the wholemechanism through the above mentioned clutch I24, I25. Further provided is disc I30 mounted'on shaft I3I which carries gear I09. On disc I30 is also mounted catch I32; in a manner similar to that described in connection with members M, '44 of Fig. 2 a lever I33 is provided which is held in anon-operative full line position by spring I34, but may be put into the operative position, shown in dotted lines, if solenoid I35, connected by lead 45d to the D. C. current source, is energized.

Cable I22 is connected through D. C. blocking condenser I31 to leads I36 and 60a, respectively. Lead 60a is connected to lead 60 of the transmitting unit. Lead I36 is connected to a solenoid I48 actuating ratchet I38; ratchet I38 is operated in the same manner as described in connection with members SI, 52, 53, 56, 51,58,59 of Fig. 1. Accordingly ratchet I38 is connected by a'gear train (not shown) to wheel I39 whichpulls a suitable paper MEI of roll I4I forming a continuous message receiver, then over rollers I42, I43 and around drum I05, the paper being held. between this drum and a guard I44. Roller I45 presses the paper against wheel I39; a ratchet I 38 is mounted on the shaft carrying wheel I39 and a pawl I46 is kept in engagement with ratchet I38 by spring I41; pawl I46 is actuated by solenoid I49 connected to lead I36 and held against ratchet I38 by sprin I48a.

The paper roll arrangementAfi, i4I forming the continuous message carriers may be substituted by the following device:

An endless conveyor consisting, for instance, of a fabric band, may be provided which is supported on drums substituting paper rolls 46, MI and wheels 5!, I39, suitable guide rollers being arranged to conduct the conveyor around cylinders 6 and I05 and from wheels 5i and I39 to the drums replacing the paper rolls. Removable paper sheets, telegram forms or other implements for the application of messages are placed on the conveyor in such a manner that their safeconduct through the transmitter or receiver set is assured.

The following is the operation of the device:

Paper 33 is unwound from roll 46 inthe manner previously described and shown in Figs. 1 and 2. A message is written or a drawing is made on a section of the paper which is supported on writing pad 54. Aotuating ratchet 53, by opening switch 6i, the portion of the paper band 33 situated between ro'llersfl and -48 is drawn into the transmittin apparatus. Simultaneously through common electrical connections 45, 63, 65a and IE0, ratchet I38 is actuated and a corresponding piece of paper is drawnaround drum 205 in the receiving set shown in Figs. 3 and 4. By putting switch 6I into the T position, synchronous motors 20 and I29 which are constantly rotating at a uniform speed are connected simultaneously by the action'of springs I6; I21 and through clutches I6, I25 to shafts I and I23, respectively. Thus the two mechanisms operate in synchronism.

The optical system contained in-tube- 23 rotates and at the same time through half-nut 8 carriage 5 is moved in a longitudinal direction; a light spot 62 projected from light 7 source '29 irough the optical system onto the paper 33 will thus describe a helical path inside transparent cylinder 6 and scan the surface of the"paper which is wrapped around this cylinder. Whereever the light spot hits the light surface-of the paper, a considerable-amountrof light will be refiected or dispersed and will actuate photocell 34. If, however, light spot 62 falls on dark'p'ortions' of the paper, such as constituting the message, the reflection will be less and the current flowing through photocell in proportion to the light falling on this photocell will be reduced. This differential in light will correspond to the light and dark portions of the markings on paper 33 and will be transmitted to amplifier 38 and amplified to a sufiicient level to cause a soriber, for instance, spark electrode I40 to reproduce the message at point I49 on a special paper H8 in a manner well known in the art.

While shaft H0 is rotated by motor I29 through gear train I08 and I01, it simultaneously rotates a drum I05 because part II I, aspreviously described, engages with slot I06. At the same time half-nut I I2,- being released by solenoid II6, engages worm I I I; therefore, shaft IIO while being rotated is also moved in a longitudinal direction, thus imparting to point I 49 a helical movement corresponding to that of light spot 62 in the transmitter.

The electrical system is arranged in such a manner that whenever a dark spot is marked on paper 33,- the impulses created on photocell 34 will induce sufiicient alternating current to flow through wire II3 inorder to cause a spark to arc'over to a specially prepared paper II8 which is thus marked with a blackmark in conformity with the original on paper 3-3. The impulse transmitting method is here based on the use of nitrate coated papers; however, other methods, such asmagnetically actuated scribers may be used.

The electrical circuit is so arranged that when the drum 6 of the transmitter or the rotating shaft H3 of the receiver has reached the end of their longitudinal travel, a limit switch, not shown in the drawing, is actuated which will automatically close switch BI, restore the stand-by stage S, energizing the solenoids and thus disengages clutches IB-and I25, respectively, and bring the mechanism to a standstill.

However, it must be kept in mind that there is some inertia left which will carry the rotating movement somewhat beyond the moment of interruption, and as levers 41 and I33 are moved at the same time into operating position by their solenoids,they will engage with catch 40 and I32, respectively, and stop the rotating movement at a predetermined and definite stopping or starting point respectively. Simultaneously, solenoids I2 and I I6 will be energized and disengage half-nut 8 from shaft I and half-nut 2 from shaft III. This will cause spring I3 to pull carriage 5 into a'direction indicated by the arrow and cause it to hit against stop I4, where it will come to' rest, as indicated by the dotted line portion. Similarly, spring I50 will pu'll shaft H0 in the direction of the arrow until it is stopped by stop I5I and comes to rest in a definite and predetermined position, thus resetting the mechanism to its initial starting position.

Themessage. or drawing transmitted from the transmitter paper33 tO'the receiver paper I I8 can then be taken out of the apparatus by actuating ratchet I33 by manual controls not shown in the drawing. However; the messages may also be left in the device to be discharged when the next message i received.

Whilein the above description a photoelectric system has been indicated to carry this invention into effect, it will be apparent to one skilled in the art that this invention is by no means limited to this particular system shown and described, but that many modifications may be made without departing from the scope of this invention as set forth in the appended claims.

We claim.

1. A transmitter for facsimile systems comprising a continuous message carrier, a hollow transparent member to support the message con taining portion of said carrier, means to transport said message onto the circumference of said hollow member, a light source to create a light spot on said message carrier, and a photostatic scanner rotatably located in the center axis of said hollow member, means to displace the latter in a longitudinal direction, substantially perpendicular to the transport direction of said continuous message carrier to effect helical inside scanning of the message on said continuous carrier, and means to transmit the energy impulses of said scanner to a receiver.

2. In a facsimile system a transmitter comprising a paper band roll forming a continuous message carrier, a transparent cylinder to support the message containing portion of said paper band, means to transport said message onto the circumference of said cylinder, a pad located underneath the said paper band over a predetermined length thereof, a stationary light source, a photoelectric scanner rotatably supported in said cylinder, means to displace said cylinder substantially perpendicular to the transport direction of said paper band in order to effect helical inside scanning of the same, and means to transmit the energy impulses of said scanner to a receiver.

3. In a facsimile system a transmitter comprising a paper band roll forming a continuous message carrier, a transparent cylinder to support the message containing portion of said paper band, means to transport said message onto the circumference of said transparent cylinder, a pad located underneath the said paper hand having a length approximately equal to one half of the circumference of said cylinder, a light source, a photoelectric scanner rotatably supported in said cylinder, means to displace said cylinder substantially perpendicular to the transport direction of said paper band in order to effect helical inside scanning of the same, and means to transmit the energy impulses of said scanner to a receiver.

4. In a facsimile system a transmitter comprising a continuous message carrier, a transparent cylinder to support said message carrier, means to transparent said message carrier onto the circumference of said cylinder, a photoelectric scanner unit including a tubular housing rotatably supported coaxially in said cyilnder, an objective lens in the wall of said tubular housing, a light reflector in said housing to throw light through said lens substantially at an angle of 90 onto said transparent cylinder, a photocell adjacent said reflector to receive the light dispersed from said message carrier, a light source to throw light onto sa d reflector, means to displace said scanner in a longitudinal direction substantially perpendicular to the transport direction of said continuous message carrier in order to effect helical inside scanning of the message on said continuous carrier, and means to transmit the energy impulses of said scanner to a receiver.

5. In a facsimile system a transmitter comprising a continuous message carrier, a transparent cylinder to support said message carrier, means to transport said message carrier onto the circumference of said cylinder, a photoelectric scanner unit including a housing rotatably supported coaxially in said cylinder, a second housing open at one end and projecting therewith over the one end of said first housing, a light source and a light mask in said latter housing, an objective lens and a light reflector in said first housing to direct light through said lens substantially at an angle of onto said transparent cylinder, a photocell adjacent to said reflector to receive the light dispersed from said message carrier, means to displace said scanner in a longitudinal direction substantially perpendicular to the transport direction of said continuous message carrier in order to effect helical inside scanning of the message on said continuous carrier, and means to transmit the energy impulses of the said scanner to a receiver.

6. In a facsimile system a transmitter comprising a continuous message carrier, a transparent cylinder to support said message carrier, means to transport said message carrier onto the circumference of said ylinder, a photoelectric scanner unit including a tubular member rotatably supported coaxially in said cylinder, a second tubular member open at one end and loosely projecting therewith over the one end of said first tubular member, a light source and a light mask in said second tubular member, an objective lens in the wall of said member and a light reflector in the center of said first tubular member to direct light through said lens substantially at an angle of 90 onto said transparent cylinder, a photocell adjacent to said reflector to receive the light dispersed from said message carrier, means to displace said scanner in a longitudinal direction substantially perpendicular to the transport direction of said continuous message carrier in order to effect helical inside scanning of the message on said continuous carrier, and means to transmit the energy impulses of said scanner to a receiver including a current lead in said first rotatable tubular member connected with said photocell and a stationary blade contact contacting said lead during the rotation of said scanner to transmit the energy impulses of the scanner.

7. In a facsimile transmitter, a frame having a continuous message carrier mounted thereon, said message carrier comprising a paper band supply roll, a pad on said frame arranged to support a portion of the band for writing copy thereon, means on said frame for supporting a copybearing portion of said paper band in the form of a cylindrical sheet, scanning means for the inside surface of said cylindrical copy sheet, and means for axially displacing said sheet and scanning means relativelyto each other.

8. A facsimile transmitter having a frame, a continuous message carrier mounted on said frame, said message carrier comprising a paper band supply roll and a paper feed roll, means on said frame arranged between said rolls for supporting a portion of said paper band in the form t copy-bearing portion-of said paper band in the form of a cylindrical sheet, means onsaid can riage for "feeding-said copy-bearing sheet onto said cylindrical supporting -means,- a photoelectric scanner having an element rotatably supported inside said cylindricalcopy sheet, and means for axially displacing'said frame and sheet to effect helical inside scanning of the sheet.

10. A transmitter for facsimile systems having a carriage mounted for slidable movement, a continuous message carrier mounted on said carriage" and comprising-a paper band-supply roll anda paper feed roll, means on said carriage between said rolls' for-supporting a copy bearing portion of-said'continuous paper rollto'form a cylindrical sheet with its axis parallel to the direction of movement of said cari'iage, a photoelectric scanner adaptedto'producea rotary point of =Iight on the inner surface of the copy-bearing-sheet, and-means for displacing said sheet in a direction at rightan'gles to'the plane of rotation-of said scanningpoint.

11; In -a transmitter for-facsimile systems a continuous. message carrierja transparent cyl ind'er-to support'the message carrier, means to feed the message carrier onto the outsideof said transparent cylinder, a scanner'rotatably locat ed in said transparent"cylinder; means to displacethecylinder in'the direction of its longitudinal center axis substantially perpendicular to the transport direction'of said continuous message carrier, in ordertoefiect helical inside scanning of the message on? said continuous message carrier, continuouslyoperated: driving means to synchronously ."effect the rotation of said scanner an'd the longitudinal displacement of said transparent cylinder, means to simultaneously initiateithe said twomovements, means to simultaneously and automaticallyw disconnect said driving means-upon a predetermined completion of' said longitudinal displacement, means to restore the'initialoperatingposition'of the transmitterand-means'adapted to transmit 'the'en ergy'impulsesofthe scanner'to a receiver.

Number 12 In="a. transmitter-{orfacsimile systems a continuous messagecarrier; a transparent cylinder tosupport the message carrier, means to feed the message carrier 'onto the outside of said transparent cylinder", a scanner rotatably located in said transparent cylinder, means to displace the cylinder in the direction of its longitudinal center axis substantiallyperpendicular to the transport direction of'saidcontinuous message carrier in order to 'efiect helical inside scanning of the message'on said continuous message carrier,-a D. C. currentsupply,continuously operated-motors 4to' synchronously efiect the rotation'of said'scanner and" the -longitudinal displacement: of said a transparent lcylinden means to simultaneouslyi'initiatethe said two movements means" to simultaneously and automaticallydisconnect saiddriving means upon a predetermined completion of the longitudinal displacement; means'to restore the initial operating position of the transmitter; means automatically-operative at the interruption of the rotativemovement of: the scanner to consume the residual inertia inherentiin the rotating parts and means adapted to transmit the? energy impulses of-the scannerto :a-receiver:

WILLIAM-S. TANDLER. DAVIDS.-WALKER.

REFERENCES CITED Thefollowing references are of record in the file'of this patent:

UNITED...STATES PATENTS Name Date Ranger Dec. 24,1929 Hough Aug. 2, 1932 Zworykin Apr. 7, 1931 Schroter et alr Feb; 11, 1930 Nic'olson Sept.:5, 1933 Finch"; Aug; 27,1940 Finch Sept.. 22,-l942

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