USRE23113E - Inside scanning facsimile - Google Patents

Description

EST AVAILABLE COPY May 10, 1949. w. s. TANDLER ETAL 23,113

INSIDE SCANNING FACSIMILE MACHINE 3 Sheets-Sheet 1 Original Filed Feb. 25,' 1944 BEST AVALABLE COP May 10, 1949.

5 Sheets-Sheet 2 Original Filed Feb. 25, 1944 R I M u m a W M k NW ld m as uQ w o \amw w Q. 3 N Y R Q Q 8 t B f 9w m 4 WH- x \M h N m w ww N \FWHHU ATTO NEY BEST AVAILABLE COP.

May 10, 1949. w. STANDLER EAL 3,

' INSIDE SCANNING FACSIMILE MACHINE Original Filed Feb. 25, 1944 a Sheets-Sheet 5 WI 2 Q h \Q I h Q* R 'e n Q. oq.

Q3\ a q Q \a a 1 Q Q Q Q 1 g 1 z 1 o E k N C. q I

U Q Q Q: INVENTORS W.S.TANDLER BY D.-S.'WALKER fix ATTO NEY Reissued May 10, 1949 UNITED STATES i NT OFFICE 23,113 INSIDE SCANNING FAGSIMILE MACHINE William S. Tandler and David Ea. Walker, New

York, N. Y., assignors,

to The Western "Union by mesne assignments, Telegraph Company,

New York, N. Y., a corporation of New York Original No. 2,435,250, dated February 3, 1;)48,

Serial No. 523,824, February 25, 1944. Application for reissue October '1, 1948,

8 Claims.

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-.ofiice 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 office 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-ofiice 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 n0 influence on the transmitting procedure, on the other hand, no noise is produced; therefore, the oflice 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 is preserved, while an oral message transmitter, such as a loud speaker is audible to everybody. This is particularly important when visitors or strangers are Serial No. 53,331-

present or in required, for instance, in doctors, lawyers, stockbrokers offices.

Therefore, there is a great need and demand" for a system permitting short distance and: inter..

office communication of written messages, and;

the savings in time, the elimination of misundem standings 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, thistype of an interofflce communica-. ion system will comply with allrequirementsandi practically useful only if it is simple, sturdy, fast'working, inexpensive, reliable and practical.

While there is a great number of systems avail: able 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 dis.-. advantages.

l-lowever, in order tosecure the-full advantage and efficiency 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 isthat 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 cyl inder 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 onethat. requires considerable skill and attention} Care lessness 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 de;

vised, where a paper tape proceeds. during 'the} scanning at a slow speed while the scanner is;

offices. Where a certain secrecy is.-.

ess'r AVAILABLE COP moved across the tape by a reciprocating motion at a very rapid speed, in order to scan the paper line by line. This method introducing the reciprocating action 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 requirements is difficult to be built; besides, a device of this type is limited to comparatively low speeds. It must also be borne in mind that whatever movement is eifected by the scanner has to be duplicated by the scriber and the two movements have to be synchronized. Now, it is particularly difificult to synchronize oscillating or reciprocat ing movements at high speeds and 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 has reached only a rather limited practical application.

In facsimile systems not based on photoelectric or contact scanning or prewritten messages a mechanical electrical system is provided with which the scriber is connected at the transmitting end and a corresponding motion is effected at the receiving end 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, they are only suitable for a certain percentage of users who can adjust their writing to the intelligence level which these systems require; 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 main object of this invention.

It is another object of the same to eliminate those difiiculties which are caused by the introduction, the straightening and the adjustment of individual message sheets.

In connection therewith it is an object of 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, the writing may be stopped entirely or may be written with any writing implement and any desired speed dependent on the skill and habits of the writer.

,It is also an object of the invention to secure a permanent record of the messages written at the transmitting end and delivered to the receiv ing end.

It is an important object of the invention to provide a facsimile device which is particularly suited for inter-office communication, that is, a communication of prewritten messages from one room to another in the same building or in a nearby building; it is, however, evident that this invention may be used with equal advantage for script communication between more distant places, where it will also compete favorably with existing facsimile systems.

With the above recited and additional objects in view which will become manifest as this specification proceeds, the invention is described in the following and illustrated by the accompanying drawings, as a preferred embodiment, it being understood that modifications, variations and adaptations may be resorted to within the scope, principle and spirit of the invention, as it is more particularly claimed hereinbelow.

In the drawings,

Figs. 1 and 2 constitute the transmitter,

Fig. 1 being a vertical elevation taken on line |I 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 longitudinal elevation taken on line 22 of Fig. 1,

Figs. 3 and 4 constitute the receiver,

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

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

In order to simplify and to clarify the illustrative showing of the invention, certain parts more specifically mentioned below are shown in either of the two elevations only.

Furthermore, the term message frequently 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 7 located in frame A displaces carriage 5 in the longitudinal direction, a half-nut 8 being for this purpose associated with carriage 5 which nut meshes with worm 1.

Half-nut 8 is located on lever 9 which is journaled in bearing l0 suitably mounted on the transmitter frame A and pressed in the position shown in full lines into worm 1 by spring II. This full line position signifies the transmitting stage, denominated by T at switch 6|, whereas S signifies the stand-by or inoperative position; in the latter position the current is closed, as shown in dotted lines, and the solenoid l2 which is connected by leads 45b, 450 to the current supply disengages the nut 8 from the worm.

Worm I is connected to dog clutch member l5, which meshes with dog clutch member l 6; the latter is of the movable type and actuated by lever I1 which in turn tends to rotate in a clockwise direction under the influence of spring I8; the spring holds clutch I5, [8 in engagement, as shown in full lines, unless solenoid I9 is energized and lever I 1 is moved in the counterclockwise direction, disconnecting clutch members l6 and I5, which position is shown in dotted lines.

Clutch member I6 is connected to an electric motor 20 which is maintained in continuous rotation. A gear 2| is mounted on the shaft of worm 1 which meshes with gear 22 mounted on tube 23 of an optical scanning system. Tube 23 rotates in bearings 24 and 25 located in frame A; the optical system consists of a condenser lens 26, a mirror 2 and objective lens 28, all encased by tube 23.

A stationary tubular Jacent to tube 23.

housing 30 is situated ad- This housing 30 contains a BEST-AVAlLABLE CGPT light source 25 which by means of lens 3i and mask 32 projects a light beam into the above referred to optical system; when passing through lenses 2E, 28, the light beam concentrates a small light spot on the outside of cylinder ll. This cylinder is made of glass or some other transparent material and is connected with carriage 5. If paper 33 is supported on cylinder 6, 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 difficult 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 2? so that it strikes at a substantially right angle against the walls of the transparent cylinder 6. 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 sufiicient 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 thedrum B in close proximity to the mirror 21 and the optical system. It is therefore, characteristic that not direct but indirect reflection or dispersion is an operatin principle of the instant scanning system.

It may here be noted that facsimile transmitting system 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 36 which by insulated mounting means is located in housing 3'! and connected to amplifier 3%. The design of this contact is such that when tube rotates driven by gear train El, 22 the contact with lead 35 is maintained and impulses received by the photocell from light reflected from paper 33 are carried through contact 3*? to amplifier 33.

The amplifier is in turn coupled to line 45 through blocking condenser 3811 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 to is attached which can be brought into contact with stop lever ll. This step lever is pivoted at 522 and is held during the transmitting stage in the inoperative position by spring 53, shown in full lines. If, however, solenoid A l is actuated to reestablish the stand-by stage S, stop lever is turned in counterclockwise direction and will engage catch 50 of disc 39, thus preventing worm s from rotating beyond the point of engagement; this position of the catch is shown in dotted lines.

A paper roll at forming a continuous message carrier is mounted in frame A; it holds a sufficient supply of paper 33 which is drawn over rollers M, 48, 49, cylinder and roller 50 until it is engaged by wheel 5| w-hich incoaction with a roller 52 is capable of drawing the paper 01f 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'securea permanent record.

Between roller 41 and 48 9. support or pad 54 is provided which supports the paper strip when a message is written or a drawing is made by 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 62 which is reflected or dispersed from the circumference of the drum 6 onto the photocell 34. Ratchet 56 is rotated by .pawl El which is actuated by solenoid58 connected with lead 45a and kept in engagement with the-ratchet by spring 59. A gearing, not showmis provided between drum 5| and ratchet 55 by which drum 5| will turn a part or full or more than one revolution, if ratchet 56 is moved one tooth; pawl 51 is actuated by solenoid 58 connected to lead 45a and held against ratchet 56by spring 5811.

Figures 3 and 4 show thereceiver which by leads 68a, I361) is connected with-lead 6B of the transmitter; a frame B supported on stands IIH and H12 carries by means of bearings I03 and IM a rotatably mounted drum I05 having slotted wall portion H16. Mounted on drum IE5 is gear Iii: which meshes with gear 'lll8 below and Its above. Mounted axially inside the drum is a cored shaft III) which is-rotatable as well as slidable in a longitudinal direction within drum I95. 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 H2; this half-nut is mounted on a lever I I3 pivoted at H4 and held in the transmitting position by spring H5, but is capable ofbeing moved out of engagement with wor'm III, as shown in dotted lines, by energizing solenoid HES-which is connected by leads I36c, I361) to the D. C. current source.

Attached to shaft I I'll is a short tubular member Ill which with its outer end engages with slot IE6 of drum I05 in suchaway that when drum Hill is rotated through gear-train I01 and I08, shaft III] is rotated in'the same direction by the engagement of member I I1 "and slot I06. If at this time half-nut H2 is in engagement with worm III, then cored shaft III) will have imparted to it a longitudinal movement parallel with the axis of drum I05.

Inside of and insulated from tubular member ill a fine wire I40 is mounted capable of touching at a point I49 the paper II8 supported on drum Hi5. This wire serves as a contact and is connected by lead H9 to contact I20 which is mounted inside housing-I21 and held by cable E22 so that when hollow shaft H0 and drum I are rotated, contact is maintained between lead H9 and contact I20.

Gear I08 is mounted on shaft I23 and on the same shaft is mounted in-a fixedposition clutch member I24 meshing witl'i' clutc'h member I25; the latter is of the movable type 'and'is actuated by lever I23 in a manner-similar to clutch member I'l shown in Fig.2. A spring-l2'l maintains the clutch in the transmitting position, shown in full lines; if energized byswitc'h ISI, Fig. 2, solenoid I28 connected 'tolead 1361) will disconnect theclutch, asshown'in dotted lines.

A continuouslyrotatingmotor I29 is provided to drive the whole mechanismthrough the above mentionedclutch I24, l2 5." Furtherprovided is *BE-STJAVAILABLE cow disc I 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 4|, 44 of Fig. 2 a lever I33 is provided which is held in a non-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 4512 to the D. C. current source, is energized.

Cable I22 is connected through D. C. blocking condenser I31 to leads I35 and 60a, respectively. Lead 60a is connected to lead 69 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 5I, 52, 53, 56, 51, 58, 59 of Fig. 1. Accordingly ratchet I38 is connected by a gear train (not shown) to wheel I39 which pulls a suitable paper I40 of roll I4I forming a continuous message receiver, then over rollers I42, I43 and around drum I 05, the paper being held between this drum and a guard I44. Roller I45 presses the paper against wheel I39; a. ratchet I38 is mounted on the shaft carrying wheel I39 and a pawl I45 is kept in engagement With ratchet I38 by spring I41; pawl I46 is actuated by solenoid I 48 connected to lead I36 and held against ratchet I38 by spring I48a.

The paper roll arrangement 46, I 4| 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 I95 and from wheels 5| 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 safe conduct through the transmitter or receiver set is assured.

The following is the operation of the device:

Paper 33 is unwound from roll 45 in the 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. Actuating ratchet 58, by opening switch BI, the portion of the paper band 33 situated between rollers 41 and 48 is drawn into the transmitting apparatus. Simultaneously through common electrical connections 45, 69, a and I36, ratchet I38 is actuated and a corresponding piece of paper is drawn around drum I 35 in the receiving set shown in Figs. 3 and 4. By putting switch 5I into the T position, synchronous motors 20 and I29 which are con speed are connected simultaneously by the action of springs I3, 521 I6, I25 to shafts 1 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 projected from light source 29 through the optical system onto the paper 33 will a helical path inside transparent cylinder 6 and scan the surface of the paper Wherefor 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 I I0 is rotated by motor I 29 through gear train I08 and I31, it simultaneously rotates a drum I because part II1, as previously described, engages with slot I06. At the same time half-nut II2, being released by solenoid IIB, engages worm I I I; therefore, shaft III] while being rotated is also moved in a longitudinal direction, thus imparting to point I49 .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 IE9 in order to cause a spark to are over to a specially prepared paper II8 which is thus marked with a black mark in conformity with the original on paper 33. The impulse transmitting method is here based on the use of nitrate coated papers; however, other methods, such as magnetically actuated scribers may be used.

The electrical circuit is so arranged that when the drum 6 of the transmitter or the rotating shaft N3 of the receiver has reached the end of their longitudinal travel, a limit switch, not shown in the drawing, is actuated which will automaticaliy close switch BI, restore the stand-by stage 8, energizing the solenoids and thus disengages clutches I6 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 M 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 HE will be energized and disengage half-nut 3 from shaft 1 and half-nut II2 from shaft III. This will cause spring I3 to pull carriage 5 into shaft II 0 in the direction of the arrow until it is stopped by stop I5I and comes to rest in a definite and predetermined posit-ion, thus resetting the mechanism to its initial starting position.

The message or drawing. However, the messages may also be left in the device to be discharged when the next message is received.

While in the above description a photoelectric eesr Avmmsis co out departing from the scope of this invention as setforth in the appended claims.

We claim:

1. In a machine for facsimile systems, a sta tionary frame having a pair of uprights, a cylindrical support movably mounted between said uprights, means on said frame for supporting a paper supply rol1 at one side of said cylindrical support, paper feed mechanism mounted on said frame at the other side of mechanism including a rotary member, a pair of closely spaced rollers mounted between said uprights to guide a continuous sheet of paper from said supply roll around the outer surface of said cylindrical support and into engagement with said rotary member, an electric actuating device connected to said rotary member in such driving ratio that the energized device rotates said member a'predetermined amount to draw a measured length of paper from the supply roll around said cylindrical support, said closely spaced rollers holding the measured length of paper against the outer surface of said cylindrical support which thereby automatically shapes the paper into cylindrical form for inside scanning, a rotary hollow shaft supported by said uprights and passing centrally through said cylindrical support, a scanner arranged to operate through said hollow shaft on the inside surface of a sheet mounted on the outside of said cylindrical support, and means for producing relative axial displacement of said scanner and the supported sheet during a scanning operation.

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 band 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 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 reiiector in said first housing to direct light through said lens substantially at an angle of 90 onto said transparent cylinder,

said support, saidv a photocell adjacent to said reflector to receive the light dispersed from said message carrier, means todisplace 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.

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 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 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.

6. 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 c py 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 relatively to each other.

7. In a transmitter for facsimile systems a continuous message carrier, a transparent cylinder to support 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 substantially perpendicular to the transport direction of said continuous message carrier, in order to effect helical inside scanning of the message on said continuous message carrier, continuously operated driving means to synchronously effect the rotation of said scanner and the longitudinal displacement of said transparent cylinder, means to simultaneously initiate the said two movements, means matically disconnect said driving means upon a predetermined completion of said longitudinal displacement, means to restore the initial operating position of the transmitter and means adapted to transmit the energy impulses of the scanner to a receiver.

8. In a transmitter for facsimile systems a continuous message carrier, a transparent cylinder to support the message carrier, means to feed the message carrier onto the outside of said transparent cylinder, a scanner rotatably located in said to simultaneously and auto-,

TA FCQ Y transparent cylinder, means to displace the cylinrotative movement of the scanner to consume the der in the direction of its longitudinal center axis residual inertia inherent in the rotating parts substantially perpendicular to the transport diand means adapted to transmit the energy imrection of said continuous message carrier in pulses of the scanner to areceiver. order to effect helical inside scanning of the message on said continuous message carrier, a D. C. WIT-LIAM TANDLER current supply, continuously operated motors to DAVID WALKER- synchronously effect the rotation of said scanner and the longitudinal displacement of said trans- REFERENCES CITED pa e t Cy n me s 150 simu a flus y ini e 10 The following references are of record in the the said two movements, means to simultaneously file of this patent:

and automatically disconnect said driving means upon a predetermined completion of the longi- UNITED STATES PATENTS tudinal displacement, means to restore the initial Number Name Date operating position of the transmitter, means au- 15 1,746,407 Schroter et al Feb. 11, 1930 tomatically operative at the interruption of the 2,394,649 Young Feb. 12, 1946

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