US2427815A - Apparatus for electromechanically synchronizing a photoelectrically operated signaling system - Google Patents

Description

Sept. 23, 1947. w SK|LL|NG 2,427,815

, APPARATUS FOR ELECTRO-MECHANICALLY SYNCHRONIZING A PHOTO-ELECTRICALLY OPERATED SIGNALING SYSTEM Filed July 17, 1945 3 Sheets-Sheet 1 Sept. 23, 1947. w SKILLING 2,427,815

APPARATUS FOR ELECTED-MECHANICALLY SYNCHRONIZING A PHOTO-ELECTRICALLY OPERATED SIGNALING SYSTEM Filed July 17, 1943 3 Sheets-Sheet 2 7 16211107 w. H. shining gdfisww z P 1947- w. H. SKlLLlNG 7,

APPARATUS FOR ELECTED-MECHANICALLY SYNCHRONIZING A PHOTO-ELECTRICALLY OPERATED SIGNALING SYSTEM Filed July 1'7, 1943 5 Sheets-Sheet 3 I W u MM V wi UT! (7 e 11 231 w. 1-1: skinrng" Patented Sept. 23, 1947 APPARATUS FOR ELECTROMECHANICALLY SYNCHRONIZING A PHOTOELECTRICAL- LY OPERATED SIGNALING SYSTEM William Henry Skilling, Toronto, Ontario,

Canad Application July 17, 1943, Serial No. 495,390

17 Claims. 1

The invention is relative to improvements in a method and apparatus for electro-mechanically synchronizing a photo-electrically operated signalling system, as described in the present specification and illustrated in the accompanying drawings that form a part of the same.

The invention consists essentially of the novel features of construction as pointed out broadly and specifically in the claims for novelty, following a description containing an explanation in detail of acceptable forms of the invention.

The objects of the invention are to provide a method and apparatus for electro-mechanically synchronizing a photo-electrically operated signalling system having few easily accessible and adjustable mechanical parts; to provide a method and apparatus for electro-mechanically synchronizing a photo-electrically operated signalling system in which use is made of low motive power, both in the transmission unit and in the receiving unit; to furnish a method and apparatus for mechanically synchronizing a photoelectrically operated signalling system in which the motive power used both in the transmitter and in the receiver may be of different type and kind so that in this system it is optional whether an electrical motive power is employed on either the receiving or transmitting unit in combination with a steam, gas, air or water motive power on the opposite mechanism, whether it be receiving or transmitting, so that any type of power may be used to transmit or receive; to furnish a method and apparatus for electro-mechanically synchronizing a photo-electrically operated signalling system in which the signal sent out by ,a photo-electric cell is amplified and rectified and then transmitted either by direct line or by any other means such as wireless, telegraphy and the like; to furnish a method'and apparatus for electro-mechanically synchronizing a photoelectrically operated signalling system which may be used in connection with second class electrical circuit or circuits which in certain climatic or other conditions are subject to variable loss and in which the impedance to the signals may be very great or vary greatly, necessitating slow operation of either the transmitting or recording apparatus within the system; to provide a method and apparatus for electromechanically synchronizing a photo-electrically operated signalling system in which variable mechanical speeds may be used to conform to the limitations of the signal speed carrying capacity of the circuits in which it is used; to provide a method and apparatus f r electro-me- 2 chanically synchronizing a photo-electrically operated signalling system in which synchronization of the transmitter and receiver is not a function of the cyclage; to provide a method and apparatus for electro-mechanically synchronizing a photo-electrically operated signalling system in which the necessity for phase synchronization is altogether eliminated; to furnish a method and apparatus for electro-mechanically synchronizing a photo-electrically operated signalling system in which a simple method and apparatus employing mechanical synchronization, both in the transmitter and receiver, is used exclusively in combination with a photoelectric cell circuit; to provide a method and apparatus for electro-mechanically synchronizing a photo-electrically operated signalling system in which adjustments may be made to the speed of the motive force and adjustments may be made to the speed of the signals themselves; to furnish a method and apparatus for mechanically synchronizing a photo-electrically operated signalling system in which lengthy training of operators and mechanics is obviated; to furnish a method and apparatus for mechanically synchronizing a photo-electrically operated signalling system in which the use of a low power light unit in combination with the photo-electric cell is made possible; to provide a method and apparatus for electro-mechanically synchronizing a photo-electrically operated signalling system in which the use of any type of optical system is obviated; to furnish a system in which stray or unwanted signalling interference with the energization of the relay magnets is reduced to a minimum, resulting in very much less mutilation of the transmission characters by the receiving unit, thus saving time formerly necessitated in checking reception of doubtful characters; and generally to provide a method and apparatus for electro-mechanically synchronizing a photo-electrically operated signalling system which is simple in operation, cheap to manufacture, easy to maintain, and is durable and eflicient for its purpose.

In the drawings,

Figure 1 is a plan view of the transmitter ap-.

paratus.

Figure 2 is a partly sectional elevational view of Figure 1.

Figure 3 is a plan view of the receiving appa- Figure is a cross sectional view on the line 5-5 in Figure 1.

Figure 6 is a cross sectional view on the line 66 in Figure 1.

Figure '7 is an elevational view on the line 'I'I in Figure 3.

Figure 8; is a Wiring diagram of the transmit.- ting apparatus showing a battery operatedcircuit.

Figure 9 is a wiring diagram of the transmitting system, showing a power operated circuit.

Like numerals of reference indicate corresponding parts in the various figures.

Referring to the accompanying drawings, the transmitter consists of the base I6 on which is mounted the motor II, transmitting power through the pinion I2 to the gear I3 on the driven spindle I4 having the tape feed governor I5 thereon, while at the opposite extremity to the gear I3 is the crank mechanism I6.

On the crank mechanism I6 is the crank pin I1 and rotatably secured tothe crank pin I7 is the piston member I which is rotatably secured to the sliding member I'9 to which it is secured by the pin 20.

The slide member I9 reciprocates in the longitudinal slide members 2| and 22.

The opposite extremity of the slide member I9 to the pin 28, is fixedly secured to bracket 23 having thereon the low power electric light source 24.

' Also fixedly secured to the slide member I9 is the scanning bar 25', adapted to reciprocate across the transmitting tape 26.

Through the scanning bar 25 is a small circular aperture 21.

By reference to Figs. 1 and 6 it will be observed that the tape feed governor comprises a circular disk 28, having diametrically opposed projections 29 and 38 thereon.

The supporting frame 3| of the slide and tape mechanism forms a suitable bearing for the spindle 32, having an offset gear 33' thereon at one extremity adapted to engage with the opposed projections 29 and 38 on the disk 28, while the other extremity of the spindle 32 carries. the feed roller 34 over which travels the transmitting tape 26 which is kept in place by the tape slide members35 and 36.

On top of the tape is an upper feed roller 3! supported by a U-shaped bracket 38 secured to the frame 3|.

Through the upper surface of the supporting frame 3I and directly below the bracket 23 is the aperture 41 of suitable size and located in vertical alignment with the aperture 21 in the scanning bar 25.

Underneath the supportingframe 3I is located the photo-electric cell 39, having its cathode arranged vertically below the aperture 27 in the scanning bar 25 and also vertically below the low power electric light source 24 supported by the bracket 23. The telephotoelectric cell 39 is connected to a sensitive relay 46 by means of a standard telephoto amplifier circuit comprising a grid bias control member 4|, a rectifier 42, a sensitive ammeter 43 and first stage amplifier 44 and second stage amplifier 44A.

It will thus be seen that whenever a light ray, having its origin in the low power electric light source 24, travels through the circular aperture 21 through the scanning bar 25,;the transparent tape 26; and the aperture 47, and is received on the cathode of the photo electric cell 39, a variation of current will flow through the circuit to the sensitive relay.

The sensitive relay has two contact points 45 and 46 which permit the making and breaking of a suitable external electric circuit such, for example, as the current used on telegraph wiresv or. the. keying circuit of -a radio transmitter.

Such signals asare sent by the relay to the external electric circuit are thus governed by the signals received by the relay 4!] from the photo-electric cell 33.

The receiving apparatus comprises the motor or source of power 48, having the drive shaft 49 with the brake 50 thereon. At the extremity of the shaft 49' is the pinion 5| engaging the spring loaded gear 52.

The gear 52- is loosely mounted on the driven shaft 53 and integrally secured to the spring loaded ear 52 is the friction slip member 54, governed by the relaycontrol device 55 comprising the circular disk 56 mounted on the driven spindle 53a and having the projecting member 51 thereon adapted to engage with and disengage from an adjustable vertical stop member 58.

Also mounted, on. the driven shaft 53 is the gear 59 engaging with the offset gear 68. The offset gear 60; is secured to a second driven shaftG I, having the tape roller 62 thereon.

Mounted. close to. one, extremity of the driven shaft 53 is the pinion 63 and the, rotary crank member 64:.

The pinion 63 engages the gear 65 secured to the extremity of, the third driven shaft 66 having the spool 61 thereon. The bearings in the third driven shaft 66 are the members 68 and 69.

The rotary crank member 64, by means of the piston member I0, initiates the reciprocation of the bar II across the recording tape I5.

Secured to the bar 'II is the spring-loaded striking head I3 having the adjustable style member 14 adapted to press down on the ribbon 1'2 and form afacsimile reproduction on the recording tape 15.

The bearing for the second driven. shaft 6|,

the reciprocating bar II and the upper tape roller I6, is formed by the vertical Walls of the raised frame 11.

Secured to the base of. the frame I3 is the electromagnet I9 opposite the core of which is the movea'ble bar adapted to depress the style member "I4 and rotatably secured in the bracket 8|. The. bracket 8| is also secured to the upper surface of the recorder frame I8.

In operation, the motor II on the transmitter is started causing the pinion I2 to rotate which, by means of the gear I3, the spindle I4 and the rotary crank member I6 and the crank member I8, initiates the reciprocation of the scanning bar 25 and the. light source 24 across the transmitting tape 26.

The feed of the tape 26 is controlled by the lower roller 34 incontactwith the tape, whose rotation is governed by the spindle 32 and the offset gear 33., engaging at every half revolution the projections 29 and 30 on the disk 28 secured to the spindle I4.

The peripheral size of the disk 28 is such that each projection forces the offset gear 33 and the spindle 32 to rotate, thus moving the marked transmitting tape 26 forward a predetermined distance during each half revolution of the shaft I4.

It will thus be seen that during the time occupied by one half revolution of the spindle I4,

which time is necessary for complete scanning by the light member 25, of the marked transmitting tape 26, the tape is not in motion.

When the scanning is complete, the opposite projection on the disk 28 has then rotated half a revolution, causing the offset gear 33 to move the tape roller 34 and the tape a predetermined distance forward.

The message, characters or marks on the transmitting tape 26 will then pass over the aperture 41 and below the circular aperture 21 in the scanning bar 25 thus blocking out the light rays from the light source 24.

Passage of the electrons to the anode within the telephoto cell 39 is thu systematically and intermittently interrupted.

The interrupted current emitted by the telephoto cell 39 is then conducted through the normal telephoto circuit, comprising a suitable grid bias control member 41 and the rectifier 42, the ammeter 43 and first and second stage amplifiers 44 and 44A to the sensitive relay 4D.

The sensitive relay 4!! thus actuates a suitable external source of power causing it to transmit signals in accordance with the operation of the telephoto circuit.

It will be understood that a dark mark on the tape will cause a rise in the current of the photo cell amplifier circuit and thus pull the armature of the relay towards the relay magnet, thus causing the contact point on the armature to touch the external circuit contact points of the relay and so close the external circuit.

When light falls on the cathode within the telephoto cell, the current diminishes, thus enabling the armature of the relay to be released, which open the external circuit.

It will be seen that marks or absence of marks on the transmitting tape 26 must cause the armature to open and close the external circuit, thereby initiating signals in the circuit connected to the recording apparatus.

The aperture 2'! in the scanning bar 25 is made of a predetermined size so that the scanning bar passes over the frame 3| beyond the extremities of the lower aperture 51 at one or both ends, thus blocking the light from the photo cell automatically, at each, or at each alternate stroke, thereby causing the relay 40 to close the external contact points and send out an automatic signal independently of whether there are marks on the transmitting tape or not. This automatic signal is for the purpose of synchronizing the speed of reciprocation of the member of the receiver with the reciprocatory mechanism of the transmitter.

The automatic signal is received simultaneously by the electromagnets 55 and 15. In the case of the electromagnet 19, the effect of energizing the coil is to depress the bar 80, forcing the style 14 and the ribbon 12 to mark the facsimile tape 15.

It will be understood that the style 14, bein secured to the reciprocating bar 1 I, will reciprocate across the facsimile tape and will mark the tape so long as the bar 80 i depressed by action of the electromagnet 19.

In order to ensure simultaneous reciprocation of the piston l8 on the transmitter with the link 10 on the recorder, the electromagnet 55a, illustrated in Figure 7, is used. It will be seen from Figure '7, that on the driven spindle 53 is adjustably mounted the disk cam mechanism 56, having the projection 51 thereon engageable with the stop member 58 adjustably mounted on and through the bar member 55, whose extremity 82 is adapted to be pulled into contact with the core 83 of the electromagnet 550. when the electromagnet 55a is energized by the signal from the external circuit.

When the electromagnet 55a is not energized, the extremity 82 of the movable bar 55 is in the position indicated by the dotted lines in Figure 7 by action of the spring member 84.

When the bar 55 is in this position, the projection 51 and the circular disk 56 can rotate freely. When, however, the electromagnet 55a is energized and the extremity 82 of the bar 55 is in contact with the core 83, the adjustable projecting member 58 on and through the bar 55 prevents rotation of the disk 56 and the shaft 53.

Thi arresting of movement of the shaft 53 results, of course, in the arresting of the reciprocation of the bar H and, consequently, marking of the facsimile tape by member 14 will cease during this time.

It will be apparent that since the motor 48, the pinion 5|, the gear 52 and driven shaft 53 are independent of the motor on the transmitter, the effect of the electromagnet 55 will be to control the rotation of all members on the shaft 53 in synchronization with the signals received from the transmitting apparatus and it will further be apparent that since the signal from the transmitting apparatus is received by the electromagnet 55 and the electromagnet 19, the marking of the facsimile tape will be in exact accordance with the reception of the signals from the transmitting apparatus.

It will be also understood that when the shaft 53 is prevented from rotating by means of the projection 51 and the operation of the electro-- magnet 55a, as shown in Figure '7, the gear 52 continues to rotate by the consequent slippage of operation of the spring loaded friction clutch member 54.

In general, also, it is desirable that the reciprocation of the member I! on the recorder should be somewhat faster than the reciprocation of the scanning bar 25 on the transmitter and, to eifect this, the ratio between the pinion l2 and the gear 13 is one to six, whereas the ratio between the corresponding members 5! and 52 on the recording apparatus is one to five.

The relative speed of the driving spindle M of the transmitter can be adjusted by means of the brake member 89, while the relative speed of the spindle d9 of the recorder can be adjusted similarly by the brake member 50.

By reference to Figure 7 it will be understood that the action of the member 51, in combination with the member 55, will be to hold the style 14 during such time as the member 55a is energized by the automatic synchronizing signal. Where one projection member is employed, this will serve to hold the style free from movement at the beginning or the end of any traversing stroke by the scanning bar 25 across the tape 25 and the orifice 4'! of the transmitter. It is optional whether one projection or two projections are employed on the disk 56. If the two projections are employed the synchronization occurs at the end of each traverse of the transmitting tape and the orifice 41 by the scanning bar 25.

It will also be understood that the automatic signal sent out by the transmitter, which is independent of the signals initiated by the marks on the transmitting tape, will energize the member 55a on the recorder when the reciprocal scanning bar 25 is at the end of a forward or of a return stroke across the orifice such stroke.

If two members 5'! are employed on the disk 5'5 of the recording apparatus, this energizing of the member 55 will occur twice; once at the end of the forward stroke of the scanning bar 25, when the light signal is broken by passing over the end of the aperture 21, and once at the end of the return stroke of the scanning bar 25.

It will be seen that by this means the receiving mechanism is synchronized exactly with the transmitting mechanism, so that the reciprocatory members I8 and 10 of the transmitter and receiver respectively are in exactly the same position at the same time, independently of the speed of the two motors, providing that the speed of the transmitting motor is always somewhat less than that of the receiving motor.

The operation of the style I4 on the facsimile tape I5 will be understood by reference to Figure 3, in which the endless ribbon is fed round the spool 61 over the supporting spool 85 and through the spring guides 86 and 8'! across the facsimile tape 15, the extremity 8B of the endless ribbon returning to the spool 67. It is also understood that the inking style I4 may be replaced by a self inking style, in which case the employment of the pinion 63, the gear 65, the spindle 66, the spool 61 and the ribbon mechanism generally is obviated.

In Fig. 8, 40 indicates a relay having output connections a and b. It will be noted that since the circuit of Fig. 8 is the alternative of the circuit of Fig. 9, that the relay 40 of Fig. 9 has similar terminals a and I). Now, referring to Fig. 3, the relays 55a and 19 are obviously connected in series by the circuit elements I08 and I00, the lead I I connecting relay I9 to ground. The lead I I0 terminates in a terminal b which is the terminal of the relay 40. The line H0 is connected to ground and has a suitable source of energy I I I extending therefrom to a terminal a, the latter being the terminal a of the relay 40.

The operation of the circuits of Fig. 8 and Fig. 9, depending on which is chosen for incorporation in the transmitter of Fig. 1, actuates the relay 40 to cause actuation of relays 55a and I9 in the receiver of Fig. 3.

In Fig. 9, 89a indicates a source of alternating current which is connected to the lines 90 and 9|. The current fiowing through line 90 is taken to the plate of the rectifier tube 92 and is passed to the cathode 03 during which course it is rectified in the usual manner in conjunction with the condenser 94 which is incorporated in line 9I. The positive current is passed by the line 95 through the relay 40 to the anode 91 of the telephoto tube 98 where it is passed to the cathode 99, thence to the grid of the amplifier tube I 00 by line IIlI in conjunction with rotor of the grid bias control I02. The grid controls the passage of electrons from the cathode to the plate of the amplifier tube I 00. The plate of amplifier tube I00 is connected by the lead I03 with the anode 97 of the telephoto cell 98 so that the plate current is passed via the lead I03 by line I04 to one side of the winding of the coil of relay 40. The other side of the relay coil is connected to the cathode of the rectifier tube via line 95 and also is connected via line I05 with one side of the filter condenser 94, the other side of the condenser being connected with line 9| and by line I06 to one side of the stator of the grid bias control I02. The other side of the grid bias control is connected by line I01 with the cathode of the ampli- 4'! or at both ends of 8 fier tube I00. As a result of these connections, a direct current is caused to flow completely through the circuit and through the coil of the relay 40, the amplifier tube I00 functioning to build up the value of the signal so that it is high enough to operate a relay, the rectifier tube 92 functioning in conjunction with the filter condenser, to convert the alternating current from the source to a direct current in the circuit. The untied ends of the leads of the heater in the rectifier tube 92 and amplifier tube I00 are designed for connection with any suitable source of alternating current according to the filament or heater voltage value of the tubes.

The operation of the relay is effected through this circuit by the rise and fall of the milliampere value in the circuit caused by the intermittent shutting oil and passage of the light as between the anode and cathode of the photoelectric cell.

In the case of Fig. 8, a battery circuit is illustrated for performing exactly the same function but operating with direct current at the source and thus eliminating the rectifier tube and the filter condenser, the relay being connected to the terminals shown and operating from the filament to the plate of the amplifier tube I08.

It will be apparent that many variations and alternatives are inherent in the described structure without departing from the spirit and scope of the invention as defined by the appended claims.

What I claim is:

1. In an electro-mechanically synchronized facsimile signalling system, a signal transmitter, an external source of'electrical energy and an external signal circuit therefor in connection with said transmitter, the latter including a frame having a relay, the latter adapted to initiate signals in the said external signal circuit, an independently operable photo-electric means adjacent to said frame to operate said relay, a light conducting surface having lines or characters marked thereon and movable over said frame, reciprocable means on said frame, light emitting means mountable in connection with said reciprocable means and adapted to traverse and scan said light conducting surface, an independent source of power, the latter in connection with said reciprocable means on said frame for causing traversing movement of said light emitting means, means in connection with said independent source of power for synchronizing the movement of said light conducting surface with that of the said reciprocable means.

2. In an electro-mechanically synchronized facsimile signalling system, a signal transmitter, an external source of electrical energy and an external signal circuit therefor, said transmitter including a frame having a relay, the latter adapted to initiate signals in the said external signal circuit, an independentlyoperable photoelectric means having a light responsive element to operate said relay, a light conducting markable surface movable over said frame, reciprocable light emitting means, reciprocable light shielding means having a light aperture therein selectively to direct rays from said light emitting means onto said light conducting surface, an independent source of power, reciprocable means operable by said source of power, said reciprocable light emitting means and said reciprocable light shielding means being mountable in connection with sai'd'freciprocable means, the latter bein adaptedifto traverse said light conducting surface, said reciprocable light emitting'means being adapted to traverse and selectively scan said light conducting surface, means on said frame to limit the extent of the scanning path of the said light emitting means, said means permit ting light from said light emitting means to become incident on said light responsive element to operate the said relay to initiate and control signals in said signal circuit.

3. A signal transmitter as claimed in claim 2, in which the said photo-electric means includes an independent source of electrical energy and a circuit therefor having therein amplifier means and rectifier means, said amplifier means and said rectifier means being in connection with saidrelay.

4. A signal transmitter as claimed in claim 2, in which said light conducting surface is adapted to have lines, characters or other markings which are impervious to lightthereon, said surface being formed as a continuous'ribbon member transparent to light and having guidemeans t position said ribbon in relation to said reciprocable light emitting means.

5. A signal transmitter as claimed in claim 2, in which said reciprocable light emitting means includes a light source adjustably mounted on said reciprocable means in optical alignment with light aperture of said reciprocable light shielding means and with said light responsive element of said photo-electric means.

6. A signal transmitter as claimed in claim 2, in which said synchronizing means includes a spindle in connection with said source of power, a disk secured to said spindle and having projections thereon engageable by a toothed rotary member mounted on a driven spindle, the latter having roller means mounted in connection therewith adapted to engage and intermittently move the said light conducting surface over said frame between successive reciprocations of said reciprocable light emitting means.

7. In an electro-mechanically synchronized facsimile signalling system, a signal transmitter, an external source of electrical energy, an external signal circuit therefor, said transmitter including a frame having a. relay, the latter being adapted to initiate signals in said signal circuit, an independent photo-electric means and circuit to operate said relay, a reciprocable light emitting means adapted to scan a movable light conducing surface having lines or characters thereon, an independent source of power on said frame to cause reciprocation of said light emitting means, synchronizing means on said frame for regulating movement of said light conducting surface in accordance with that of said reciprocable light emitting means, said reciprocable light emitting means being designed to be intermittently incident upon said photo-electric means to initiate said relay governing said external signal circuit.

8. In an electro-mechanically synchronized facsimile signalling system, a signal transmitter, an external source of electrical energy and an external signal circuit therefor, said transmitter including a frame having a relay, the latter adapted to initiate signals in said external signal circuit, an independently operable photo-electric means having a light sensitive element to operate said relay, a light conducting markable surface movable over said frame, reciprocable light emitting means, reciprocable light shielding means having a light focussing means selectively to direct rays of light from said light emitting means onto said light conducting surface, a source of power on said frame, reciprocable'means in connection with said source of power and adapted to traverse said light conducting surface, said light emitting meansbeing adapted to traverse and scan said light conducting surface, defining means on said frame to limit extent of said light conducing surface scanned during each traverse thereof by said light emitting means,'and said means limiting the distribution of light from said light emitting means which becomes incident during each traverse of said means on said photoelectric means to operate said relay governing said external signal circuit, means on said frame for synchronizing speed of movement of said light conductin surface with speed of said reciprocable light emitting means.

9. A signal transmitter as claimed in claim 8, in which, said defining means includes a frame impervious to light rays-said frame having a portion defined therein transparent to light and said frame having said light sensitive element of said photo-electric means positioned therein adjacent to said portion to form a part of the optical path of said light emitting means during each complete reciprocation of the latter. 7

-10. A signal transmitter as claimed in claim 8, in which, said reciprocable-light shielding means includes a light-impervious shield member, adjustably mounted on saidreciprocable means and having a portion defined therein which is transparent to light, said portion being adapted throughout each complete reciprocation of said means to concentrate and focus light'from said reciprocablev light-emitting means throughsaid light conducting surface onto said light responsive element.

11. In an electi e-mechanically synchronized facsimile signalling system, a signal recorder, an external signal circuit in connection with said recorder, a signal transmitter having reciprocable scanning means and being in connection with said external circuit, said recorder including a frame, an independent source of power, reciprocable means in connection with said source of power, a markable surface movable over said frame, synchronizing means controlling said reciprocable means to regulate speed of motion of the latter in accordance with speed of motion of said reciprocable scanning means of said transmitter, a reciprocable facsimile marking means mountable in connection with said reciproable means to mark said movable surface in exact reproduction of marks being transmitted by said transmitter, means for regulating speed of movement of said movable surface in accordance with speed of said reciprocable means, selective means on said frame to govern intermittent contacting by said facsimile marking means with said movable surface at such times only as said transmitter is energizing said external circuit.

12. An electro-mechanically synchronized facsimile recorder as claimed in claim 11, in which said reciprocable means includes a spindle driven by said source of power and having braking means, a clutch on said spindle engageable with and disengageable from a driven spindle having a rotary member in connection with a link and wrist pin connection with a reciprocable slide member, the latter having guides therefor, said reciprocable member being adapted to traverse said markable surface substantially in phase with said reciprocable scanning means of said transmitter.

13. An electro-mechanically synchronized facsimile recorder as claimed in claim 11, in which said synchronizing means includes aspur disk mounted on a spindle driven by saidsource of power, said spur disk being" located toeng'age a trip means mounted in connection with a rotatable spring held means, the latter having a portion" engageable with magnet means energizable by said external circuit in accordwith period of energization of said external circuit by said transmitter.

14. An electro-mechanically synchronized facsimile recorder as claimed in claim 11, in which said facsimile marking means includes a marking style swingably mounted in phase with said reciprocable means, depressor means operable by magnet means in phase with magnet means for operating said synchronizing means, said depressor means'adapted to cause contacting of said swingably mounted marking style with said markable surface during period of energization of said eiternal circuit by said' transmitter.

15. An electro-mechanically synchronized facsimile recorder as claimed in claim 11, in which said depressor means includes abracket mounted on said recorder having an onset bar member journalled in said bracket, aportionofs'aid'bar member being attractable by said magnet means and being engageable with said swingably mounted marking style, to'cause' the latter to engage said markable surface.

16. An electro-mechanically synchronized facsimile recorder as claimed inclaim 11, in which said means for regulating speed of motion of said movable surface in accordwith speedof motion of said reciprocable facsimile marking means includes a; rotatable memberhaving projections thereon and mounted on aspindle; drivenby said source of power, sai'd projections being intermittently engageable with a toothed membersecured to a driven spindle-having roller means thereon, the latter being adapted to move said movable surface in phase-with said'reciprocable facsimile marking means, guide means on said frame for positioning said light conducting movablesurface in relation to said facsimile marking means.

17. An electro-mechanically synchronized facsimile recorder as claimed in claim 11, in which said selective means on-said frame to synchronize intermittent contacting bysaid fac'simile' marking means with said movable surface at such times only as said transmitter is energizing said ex ternal circuit includes magnet means in connection with said external circuit, said magnet means governing the contacting of said reciprocable marking means with said movable surface.

WILLIAM HENRY SKILLING.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

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