US2377323A

US2377323A - Record driving mechanism for pneumatic actions

Info

Publication number: US2377323A
Application number: US331564A
Authority: US
Inventors: George W Carlson
Original assignee: ROBERT H MCCLINTIC
Current assignee: ROBERT H MCCLINTIC
Priority date: 1940-04-25
Filing date: 1940-04-25
Publication date: 1945-06-05
Anticipated expiration: 1962-06-05

Description

June 5, 1945. G. w. CARLSON RECQRD DRIVING MECHANISM FOR PNEUMATiC ACTIONS '7 Shets-Sheet 1 Filed April 25, 1940 l 0 Q0 C) Q 0 a I INVENTOR George W CarZson June 5, 1945. G. w. CARLSON RECORD DRIVING MECHANISM FOR PNEUMATIC ACTIONS Filed April 25, 1940 7 SheetsSheet 2 INVENTOR ye W Carlson Gem 6, Z;

June 5, 1945. G. w. CARLSON RECORD DRIVING MECHANISM FOR PNEUMATIC ACTIONS Filed April 25, 1940 '7 Sheets-Sheet 3 GN mb W I- I .1 1 v u u a a n n x w I!!! h kw l: {:1 ||||.v|-- .f n n I m VN 9 v a? //m J mm M w w 1 m mvmv w HnHhHHH-PJH IHHH Hun: ll Till L D Wm Nm. m H I MN Q MET w an 1 MN w L m mw Q v 1! Q3 n F NM NN N mm M M NH INVENTOR June 5, 1945. w, CARLSQN 2,377,323

RECORD DRIVING MECHANISM FOR PNEUMATIC ACTIONS Filed pril 25, 1940 7 Sheets-Sheet 4 i W H f1? b In I I O U) l Q Q 0 q a" a Q N IQ '[\"7.:=\\:I N

s In 1) to N 0 1) 0 Q N I 5 1 g 63 "I l il {Q N g l 2 w L g INVENTOR Ge or ge W Carlson June 5, 1945. G. w. CARLSON RECORD DRIVING MECHANISM FOR PNEUMATIC ACTIONS Filed April 25, 1940 Sheets-Sheet 5 ll-J L V 17- b ///4 To STOP Cmcu/T 5 A & P l INVENTOR 4 George W. Carlson a! 4-,

i 7 z r: :3 C roar/m1 m, k\ 12 Cmcun' June 5, 1945. w, CARLSQN 2,377,323

RECORD DRIVING MECHANISM FOR PNEUMATIC ACTIONS Filed APril 25, 1940 7 Sheets-Sheetfi '73 mmm mum *wwm I I Q 5 91 102" Q Q w i 10 Q; A I

gar- INVENTOR George W Carlson I m M Jane 5, 1945.

G. W. CARLSON RECORD DRIVING MECHANISM FOR PNEUMATIC ACTIONS Filed April 25, 1940 7 Sheets-Sheet 7 INVENTGEE' George W. Carlson r uma 95km t S R H Patented June 5, 1945 RECORD! DRIVING MECHANISM FOR PNEUMATIC ACTIONS George W. Carlson, Pittsburgh, Pa", assignor to Robert H. Mcclintic, Pittsburgh, Pa.

Application April 25, 1940, Serial No. 331,564

14 Claims. (Cl. 24z 55) types of mechanisms, it will be particularly described in connection with the pneumatic typewriter action, but it will be understood that this is by way of illustration and not by way of limitation. Where a typewriter is operated pneumatically for the individual typing of standardized letters, it is often desirable, particularly where the letters are relatively short, to have several different letter records out on a single record roll. This avoids the necessity for the changing of the record roll every time a difierent letter is to be written. Where such a multiple record is provided on a single roll, it is necessary to provide some selector action whereby a predetermined letter on the record may be selected out and written. It is further desirable that the selected record be repeated until some other selection is made.

For example, in the collection of accounts, different standardized letters are written to different customers depending upon the condition of their account. The operator of the pneumatic typewriter usually operates the machine with a file of account cards which is followed through in alphabetical order. Some of these accounts may require a letter written at the front of the record roll, others may require a letter that is out near the end of the record roll, while still others may require letters cut at an intermediate point in the full length of the record. According to the present invention there is provided a record driving mechanism including a selector whereby the operator may initially select the first letter to be written and this letter will be repeated until the operator changes the selection. The invention further provides a selector mechanism where a selection may be made for a succeeding letter while the machine is writing one letter so that after finishing the letter-which is being written, the record will automatically turn to the next succeeding portion of the record to be utilized.

The record, when it is playing or writing, is driven at a fairly slow speed forward, winding from the record roll onto a take-up spool. Where a selector is used it is desirable that there be, in addition to the slow forward speed, a skip forward drive at which the record will be driven at a relatively high speed forward without writing or playing until it reache the selected portion of the record when the skip forward speed is rendered inoperative and the conventional forward drive becomes operative. The present invention provides for such a forward operation of the record roll. In conventional pneumatic ac- ;ions, the rewind is always at a relatively higher speed than the forward playing of the record. The present invention provides a selector'wherein the rewind, instead of rewinding to the beginning of the record roll, as in many types of selector actions, rewinds only to the beginnin of that portion of the record which is to be utilized in the next operation of the machine.

The present invention provides a selector action which is unique, positive and more easily and conveniently operated than selector mechanisms heretofore used for the same purpose and which is less complicated and expensive than previous mechanisms. The invention further provides a record driving mechanism of a new construction, together with pneumatic circuits of an improved character. The invention further provides a selector action which can be coupled into a conventional pneumatic circuit for mechanisms of this kind with very little change in the organization and assembly of such circuits.

My invention may be more fully understood by reference to the accompanying drawings in which Figure l is a plan view of a pneumatic mechanism embodying my invention which mechanism is adapted for the operation of a typewriter, the typewriter however not being shown;

Figure 2 is a side elevation of the mechanism shown in Figure 1;

Figure 3 is a top plan view on a somewhat larger scale of the record spool mechanism and its drive;

Figure 4 is an end view of the double pneumatic for controlling the rewind and skip forward drive;

Figures 5, 6, 7 and 8 are details of a cut-off valve in the pneumatic brake-controlling line;

Figure 9 is a vertical section through the selector mechanism, the selector valve being shown in elevation;

Figure 10 is a section similar to Figure 9 but at right angles thereto:

Figure 11 is a horizontal section in the plane of line XI-lfl of Figure 9, the view showing an elevation of the record-driven selector-shifting mechanism;

Figure 12 is a view partly in plan elevation and partly in section showing the selector valve-operating pneumatic and showing one of the selector valves in section;

Figure 13 is a perspective view showing the mechanism for transmitting motion to the selector valve-operating mechanism;

Figure 14 is a side elevation of a part of the selector mechanism showing the position of the parts for a skip forward operation;

Figure 15 is a view similar to Figure 14 showing the position of the parts in effecting a rewinding operation;

Figure 16 is a diagram of the pneumatic circult;

Figure 17 is a section through a conventional pneumatic on-and-ofl valve;

Figure 18 is a detail view of the double pneumatic as shown in Figure 4 and certain associated parts, including what is termed the drive pneumatic release valve; and

Figure 19 is a detail view in perspective of the drive pneumatic release valve shown in Figure 18.

General construction The particular pneumatic mechanism illustrated is of the general construction disclosed in my copending application, Serial No. 313,415, flied January 11, 1940, now Patent No. 2,327,172, dated August 17, 1943. The mechanism comprises abase frame 2 having a record spool mechanism and drive at the back thereof. Forwardly of the spool mechanism and set into an opening in the platform 2 is a key-selecting unit designated generally as 3 having a plurality of tubes 4 leading to openings in a tracker bar. The key-selector mechanism selectively operates pull rods 5 which in turn serve to pull down a key-operating hook 6 more fully explained in the said copending application. The arrangement is such that when a given character opening in the tracker bar is uncovered by the record, an impulse of air is admitted to an appropriate unit of the key selector, operatink one of the pull rods 5 and key-engaging hooks 6 to depress the corresponding key of the typewriter or other multiple key device. The typewriter, which is not shown, sets on the base 2 and covers the selector 3, the wires 5 and the keyboard extending over the hooks 6 so that these hooks may engage the key bars.

On the base 2 is a support I having a number of control buttons of which I, 9 and I0 may be referred to in connection with the present application Button num ber Ill is the "start button. Depressing of this button admits air to a pneumatic circuit which initiates the forward driving of the record. Button number 8 is the stop" button. When it is operated, atmospheric air is admitted to a pneumatic circuit to stop the recorddriving mechanism. Button number I when depressed admits air to a pneumatic circuit to manually effect a rewinding of the record.

The record spool mechanism Mounted on the base of the machine 2 near the back thereof is an electric motor l2 which drives a pneumatic or vacuum pump located on the base of the machine in the general vicinity of the reference character II in Figure 3, but this vacuum pump forms no part of the present invention and is not illustrated in detail. The motor also drives through a reducing gear a sprocket wheel H and ,it also drives through a reducasmsss ing gear at a somewhat higher speed, a larger sprocket wheel II.

The record spool mechanism comprises two side plates II and I! which are supported on standards above the base 2. A tracker bar II has its opposite ends set in the two plates. This tracker bar has a number of openings as will be readily understood by those familiar with pneumatic actions, and all of the openings have not been shown. Carried on the plate I. to the rear of the tracker bar and somewhat below the tracker bar is a record-holding disk I! having a cone 20 at the center thereof adapted to project into the hollow interior of a record roll. This disk is freely rotatable. Carried on the plate H in alinement with the disk It is a second cooperating disk 2| for engaging the other end of a record roll, the disk 2| having a projection 22 to enter the center .of a record roll. The disk 2| is carried on a thereof. The shaft 21 for the take-up spool is provided with a drum 2! at its left-hand end. The right-hand end of the shaft 21 rojects through the plate I! and has a spur gear 29 (best shown in Figure 2) at its outer end.

The plate II ha two horizontally projecting brackets 22 and II thereon which provide a bearing for a shaft 22. Secured to the shaft 32 is a sprocket u. A chain 34 passing around the sprocket II and around the sprocket 22 serves to transmit power from the motor to the shaft 22. Splined to the end of the shaft I2 so that it may be shifted longitudinally on the shaft but remain keyed to the shaft is a friction disk 2| having a grooved hub portion 26 thereon. The periphery of the friction disk 28 projects through a window or opening 21 in the plate II and extends between the periphery of the disk I! of the record holder and the periphery of the flange 25 of the record spool. When the friction disk I! is thrust forwardly as viewed in Figure 3, it contacts the periphery of the flange 2| on the take-up spool to drive the take-up spool, and when it is thrust rearwardly as viewed in Figure 3, it frictionally engages the periphery of the disk II to rewind the record.

For moving the friction disk II back and forth to engage the periphery of one or the other of the two members, there is provided a yoke 22 which engages in the groove of the hub ll of the friction wheel, said yoke being at the end of an arm I! on a rock shaft 4| which rock shaft passes through the plate I8 and has its opposite end passing through the supporting plate II and which is located forwardly of and below the axis of the record roll.

The friction disk '25, when it is driving the take-up spool, drives the spool at a relatively high speed to effect what has been herein referred toss the skip forward" operation of the record. In the skip forward of therecord the record moves at relatively high speed forwardly over the tracker bar but the key selector mechanism is rendered unresponsive to this movement of the record. This friction disk 8| also rewinds the record at a relatively fast speed and of course in the rewinding operation the key selecting action does not respond to the movement of the record.

For operating the rock shaft 46 to shift the cross bar 44 connects the movable plates of the pneumatic 4| and 46 so that both pneumatics operate in unison and when one expands, the

other collapses. A lever 45 clamped to the rock shaft 46 extends down from the rock shaft and has its lower end pivotally secured to the connecting bar 44 so that when the connecting rod 44 shifts hack and forth, the lever 45 is rocked to rock the shaft 46 and thus shift the friction disk 65. The lever 45 may assume a neutral position in which neither of the pneumatics 4| or 46 is fully expanded or contracted and in this position the friction wheel 65 is out of contact with both of the

elements

44 and 45 which it is designed to drive.

The plate It also carries two other horizontally extending brackets 46 and 41 (see Figure 3), the forward bracket 41 being in a. plane above the bracket 46. A shaft 46 has a loose bearing in the bracket 46. The other end of the shaft 46 i received in a bearing 49 mounted in a link 50 pivotally hung from the bracket 41. Keyed to the shaft 48 is a friction wheel i and which also carries a sprocket 52. A chain 53 transmits motion from the motor-driven sprocket i4 to the shaft 48 and friction wheel 5|, The friction wheel 5i is of smaller diameter than the friction wheel 35, and the sprocket i4 is driven at a lower speed than the sprocket I 5. The periphery of the friction wheel 5| projects into an opening 54 in the side plate iii. The friction wheel 5i may be moved into and out of engagement with the end face of the disk 25 of the record spool 24. This is accomplished by swinging the link 50 toward and away from the plate i6, the loose bearing of the shaft 48 in the bracket 46 permitting this movement of the shaft and friction wheel. When the friction wheel 5| is held against the end face of the take-up spool, it serves to drive the spool forwardly at a relatively slow speed which is the proper speed for operating the typewriter or other multiple key device. When the friction wheel Si is moved out of engagement with the end of the take-up spool, it of course has no driving connection with this spool.

For swinging the link 50 toward and away from the plate IE to bring the friction wheel 5| into and out of driving engagement with the end of the take-up spool, the link 50 has a pull rod 55 attached to its lower end. This pull rod passes through the plate l6 and across the front of the spool bodies a shown in Figures 1 and 3 and through the other side plate l1. It is provided at its free endwith a, nut 56 that forms an abutment against which a lever 51 engages. The 1ever 51 projects from the movable element 56 of a pneumatic 59, the arrangement being such that when the bellows-like pneumatic 56 is collapsed, the lever 51 moves toward the left as viewed in Figure 3 tending to pull the rod 55 to the left thus bringing the friction wheel 5| into engagement with the end of the take-up spool. When the pneumatic 56 is open, a compression spring 66 moves the rod 55 in the opposite direction.

The pneumatic 66, because it serves to operate the drive which drives the record forwardly at the normal speed, is termed the "drive pneumatic" as distinguished from the skip forward pneumatic 43 and rewind pneumatic 4i. The record-driving mechanism as described, therefore. comprises the record spool holder in the form of the disks l6 and 2i, the take-up spool 24, the skip forward and rewind drive, and the normal forward drive. The record designated X in Figure 1 is moved over the tracker bar from the record holder to the take-up spool or in the opposite direction. In order that the drive pneumatic 56 will always be released when the skip forward or rewind pneumatics are energized, the

rock shaft 46 is provided with a second lever 6i (see Figure 18) similar in construction to the lever 45. The lower end of this arm is positioned between two spaced metal strips 62 and 63 at opposite sides of a valve box 64. The valve box 64 is mounted ona second valve box 65 which houses a complicated valve system forming no part of the present invention and through which various functions of the typewriter are controlled from the. record and which corresponds generallimto the valve unit 0 of my prior Patent No. 2,180,793. When the rock shaft 46 is moved in either direction out of a neutral position, the arm 6i presses one of the valve fingers or strips 62 or 63 as the case may be away from the valve box 64. This serves to open a vacuum circuit to atmosphere in such manner that the drive pneumatic 59 cannot be collapsed by suction as long as air is thus admitted. This may be understood by reference to the pneumatic circuit diagram of Figure 16, and will be hereinafter more fully described.

Th spring fingers

62 and 63 not only provide opposed valves, but they exert a pressure, when flexed to move the arm 6|, and hence the friction wheel 35 to neutral position.

Record selector mechanism The record spool mechanism which has been described has for its purpose to move the record roll backward or forward over the tracker bar, there being two forward speeds, one for playing and one for skipping forward to some subsequent part of the record. It is contemplated that a single record roll or record sheet shall have a plurality of separate records thereon, in the case of a typewriter each separate record being either a separate letter or a separate paragraph. The purpose of the record selector is to enable the operator to select that record on the record sheet which is to be next used and to cause the record spool mechanism to operate to either wind the record forward at high speed or rewind it as may be necessary to locate the record on the record sheet which is to be used and bring the starting portion of such record into position over the tracker bar so that upon operation of the drive pneumatic the selected record will move forwardly at slow speed over the tracker bar.

It has been previously pointed out that the right-hand end of the take-up record roll is provided with a spur gear 29. This spur gear meshes with a spur gear of larger diameter 29' which is also mounted on the side plate l6. Projecting outwardly from the hub of the spur gear 29' is a shaft 66 having a bevel gear 61 adjacent the outer end thereof, there being a bracket 66 providing a bearing for the outer end of the shaft 66. The

bevel gear 91 meshes with pinion 99 on a forwardly extending inclined shaft 19. The shaft II has its forward end supported in a bearing bracket H (see Figures 9 and 10), and the end of the shaft 19 is provided with a worm gear 12 which meshes with teeth on the periphery of a worm wheel 12. The train of gearing from the take-up spool to the worm wheel 19 is a reducing train so that for the longest record which the spool will accommodate the worm wheel 19 will preferably not be driven through a full circle although it may be driven almost through a full circle. The worm wheel 19 is provided on its underface with a pin I4 the terminal of which is wedge-shaped.

Immediately below the worm wheel I9 is a hollow sleeve-like member I9 having a laterally projecting arm 19 through which extends a rock shaft TI. The rock shaft I1 is provided at its inner end with a lever arm I9 which arm projects through a slot I9 in the sleeve 19. The outer end of the shaft H has a notched disk 99 attached thereto. The notched disk which is best shown in Figures 14 and 15 is provided with one deep notch 99a and with three secondary notches 99m, 891/ and 89a in its periphery. The notch 99a is provided for cooperation with the wedge-shaped pin I4 on the worm wheel I3 as will hereinafter be more fully described. A resilient arm 99d has a terminal portion which engages in the notches 892:, 99y and 89a, depending upon the position of the disk 89, and forming a detent to properly position every movement of the disk 89 and hold it from free movement.

Projecting upwardly from the sleeve 19 from the hub of the gear wheel I9 is a shaft II, the shaft 9| being pinned or keyed to the sleeve I9, and at the upper end of the shaft 9| there is secured a knurled operating knob 92. The arrangement is such that by turning the knob 92, the sleeve I9 may be rotated to change the location of the disk 99 with reference to the pin 14 on the worm wheel I3. Below the knob 92 and supported on the bracket 'II is a fixed indexing disk 93 which is illustrated as having a series of equally spaced holes 93a therethrough near the periphery thereof. The indexing disk 99 is fixed with reference to the knob 92 and with reference to the worm wheel I9, but the worm wheel II can rotate about the shaft 9| without turning it.

Extending downwardly through the sleeve 15 is a rod 94 having an offset arm 99 at the top thereof. This arm is provided with a pin 99 thereon that passes through a slot in the lever 19 on the rock shaft 11, and the arrangement is such that when the rock shaft I1 is rocked through a limited arc in one direction or the other, correspondingly moving the arm 19, the rod 94 will be caused to slide up and down. The rod 94 projects below the bracket II. On the lower portion of the rod 94 there is a loose collar 91 having a pin 99 that projects therefrom. This collar is confined between two fixed collars 99 one above and one below it, the arrangement being such that the collar 91 with its pin 99 is caused to move up and down as the rod 94 is caused to move up and down, but at the same time the rod 94 can r0- tate with reference to the pin 99 when the whole assembly comprising the knob 92, th shaft 9|, the sleeve 19 and the rod 94 is turned.

The lower part of the rod 94 with the collar 91 and its pin 99 extend in front of a supporting plate 99 (see Figures 9 and 10). At the righthand end of this plate as viewed in Figure 9 there is a multiple valve unit, and at the left-hand end as'msss there is an operating pneumatic. The valve unit, the construction of which may best be understood by reference to Figure 12, comprises a block 9| having three push buttons passing therethrou h andarrsngedinanarconthesurfaoethereof, the uppermost of these push buttons being designated 92, the intermediate one 99, and the lower one 94 (see Figure 9). Push button 92 controls the rewind of the record; push button 99 controls the forward playing of the record; and push bution 94 controls the skip forward drive of the record. The structure for the valve controlled by the

buttons

92, 99 and 94 is the same in each case, and the one controlled by push button 99 is illustrated in detail in Figure 12. It comprises nothing more than a flexible strip 99 secured to the block 9| by a pin 99 and guided on a second pin 91. It is urged toward the face of the block by a spring 99. The end of this strip is wrapped with leather which when the valve is closed, covers the ports designated p 9', p" and p. These ports pass through the block 9i and from them lead suitable tube nipples. In Figure 12 the valve is shown in the normal closed Position but the depressing of the button 99 would uncover ports p -p to admit atmospheric air. The

push buttons

92 and 94 operate similar valves, but in the case of the

push buttons

92 and 94, a fewer number of ports are controlled and also, in the case of the valves controlled by the

push ins

92 and 94, connecting passages are formed in the block M by which cross communication is established. This is most clearly shown in the diagram in Figure 16 where the various interconnecting air channels are shown. This figure will be hereinafter more fully described.

Mounted on the block 9| is a pin 99 which passes through a push button-operating finger I99 which is in the form of a strip of metal having a terminal portion I99 at its right-hand end as viewed in Figure 12 for engaging the

push buttons

92, 99 and 94 and having at its opposite terminal an inwardly turned and or lug I99a. A spring "I on the pin 99 serves to yieldably urge the finger I99 outwardly, the arrangement being such that the finger may be rocked inv an are about the pin 99 as a pivot and it can also be rocked about an axis perpendicular to the pin 99 in a see-saw fashion to depress the terminal I99 when the terminal I99a is pushed outwardly as viewed in Figure 12. The pin 99 on the collar 91 passes through the finger I99 so that the up and down movement of the rod 94 causes the finger to be swung in an are about the pin 99 as a pivot. When the rod 94 is pushed down to its furthest limit, the terminal I99 of the finger is over the pin 92, as shown in Figure 9, and when the rod 94 is pulled up to its highest limit, the terminal I99 a over the push button 94, and of course at the intermediate position of the rod 94 the finger is in position to operate the intermediate push button 99.

For operating the finger I99 in a see-saw fashion to push the

respective pins

92, 99 and 94, there is provided on the supporting plate 99 a pneumatic I92 having a widened extension I99 thereon over which the in-turned terminal I99a of the finger rides. The arrangement is such that when the pneumatic is in a normal expanded position, it being expanded by a s ring "431 finger I99 is in a normal position. When the pneumatic I92 is collapsed by connecting it to a suction pump, the extension I99 moves outwardly as viewed in Figure 12 ap plying pressure against the terminal I99a, thereby pushing the terminal I of the finger inwardly so that the push button which is directly under the terminal when this action occurs will be depressed to open the corresponding valve,

Operation of the pneumatic I02 is always controlled from the record roll itself through an opening in the tracker bar and an appropriate pneumatic circuit. The movement of the rod 84 up and down to determine the position of the finger I00 on the other hand is determined by relative motion between the member I5 which carries the extension I6 with the notched disk 80 and the worm wheel 13 which has the notch-engaging projection I4. By reference to Figure 14 it will be'seen that if the disk 80 is in the position shown in that figure and the worm wheel is rotated in a clockwise direction, the projection 14 will move into the notch 80a in the disk 80, and as the worm wheel continues to move, it will throw the disk 80 to the over-center position illustrated in Figure 15. This clockwise movement of the gear wheel I3 will thus serve to shift the valve-operating finger I00 from the position to engage the skip forward button 94 to a position to engage the rewind button 02. On the other hand, when th parts are in the position shown in Figure 15 and the worm wheel moves in a counterclockwise direction, the projection I4 engaging in the notch of the disk 80 will return the parts to the position shown in Figure 14. It will be apparent also that if the knob 82 is turned manually to rotate the member I5 which carries the disk 80 in one direction or the other, the disk 80 will move past the pin I4, and a corresponding shifting of the finger I00 will take place. Shifting of the finger I00 will, therefore, occur either by the manual turning of the knob 82 relative to the worm wheel I3 or by motion of the worm wheel I3 relative to the position to which the disk 80 is set by the turning of the knob 82.

The worm wheel 13 of course is driven through the train of gearing from the record roll. The gearing is such that when the record roll is driving forwardly, the worm wheel I3 initially turns in a clockwise direction. When the record is rewinding, the worm wheel I3 will turn always in a counterclockwise direction. When the parts are in the position shown in Figure 14, only clockwise motion of the gear I3 is possible because the valve finger I00 is over the skip forward valve button 94 and any operation of the pneumatic mechanism must therefore initiate the forward driving of the record roll. Likewise, when the parts are in the position shown in Figure 15, the va1ve-operating finger I00 is over the rewind button and any operation which is initiated must start to rewind the record and turn the gear I3 in a counterclockwise direction. It therefore follows that when the disk 80 is in advance of the pin I4 as viewed in Figure 14 so that the worm wheel I3 must turn in a clockwise direction for the two to engage, the record will only be driven forwardly when the next operation is initiated, and when the disk 80 is behind the pin as shown in Figure 15, any succeeding operation which is initiated will be a rewinding operation. It will further be seen that the relation between the disk 80 and the pin is manually adjustable by turning the knob 82 to change the position of the disk 80 with reference to the pin I4. If the knob 82 was turned so as to advance the disk 80 with respect; to the pin I4, the succeeding movement of the record must always be a skip forward operation until the projection I4 has engaged the notch in the disk 80 and at least rotated the disk to the intermediate position. On the other hand, if the knob 82 is manually operated in a counterclockwise direction to set the disk 80 behind the projection I4, the next operation to be initiated must always be a rewind operation, and by reason of this fact a manual adjustment of the knob 82 enables any part of the record which is to be next used to be selected in advance. This will be hereinafter more fully explained.

Close to the surface of the indexing disk 83 is a pointer I05 that is secured at its center to a sleeve shaft I06 that surrounds the shaft 8I (see Figures 9 and 10) and which is driven directly by the worm wheel I3 so that the operator of the machine may follow the forward or reverse travel of the record by following the position of the pointer around the indexing disk. The periphcry of the indexing disk is provided with an annular series of closely spaced holes 03a. One stop pin is set into one of these holes 83a slightly in advance of the starting position of the record and another stop pin is spaced an appropriate distance around the periphery from the first one. Depending upon whether the record is a long one or a short one, the two stop pins will be separated a greater or lesser number of degrees. The stop pin near the starting point is to prevent the record from ever being completely run off the take-up spool after the record has been placed in the machine as long as it is desired to continue to use this one record. The other stop pin prevents the record from ever being completely run off the original spool on the forward drive. These two stop pins, which have a friction fit in the holes 83a, are designated I01 and I08. Having inserted a record in the machine, the operator starts the machine forward. When one section of the record has moved forward corresponding to one of several letters which the record will reproduce, the operator observes the position of the pointer and inserts an indexing pin generally similar to the stop pins in that hole 8311 which is nearest the pointer. The operator then continues the record forward again, finds the end of the next letter or section on the record, inserts another indexing pin, and continues to insert an indexing pin at the end of each letter on the record and at the beginning of the next. These indexing pins are designated I09a, I091), I090 and I00d in Figure 1. The number of indexing pins I09 will depend upon the number of letters which the single record will reproduce and their spacing about the periphery of the indexing disk will depend upon the length of the respective letters. The indexing pins are of slightly smaller diameter than the stop pins.

Slidable in the base of the knob 82 is a lock bar I|0 having a notched outer end. As shown in Figure 9 it is provided with an upwardly extending lug I I I and a. spring I I2 pressing against the lock serves to push the lock bar outwardly in a radial direction. The notched terminal of the lock bar is adapted to engage the selected one of the indexing pins I09. For example, if the third letter on the record is the one next to be reproduced, the operator turns the knob 82 in a pin I88b, the lug III is released and the locking bar springs out to engage the pin I88! and this then holds the knob 82 against accidental displacement and the knob 82 will remain in this position until a different portion of the record is to be selected and used. The locking bar cannot be retracted sufficiently to clear the stop pins. It has a window through it so that the position of the pointer in moving under the latch may be observed.

The pneumatic circuits Corning now to the pneumatic circuits, the machine is illustrated as having three manually operable valves 8, 8 and II which are the rewind, stop, and start valves respectively. These valves are of the type shown in Figure 5 of my Patent No. 2,180,793 wherein. therein is a push button, and depressing the button merely lets an impulse of atmospheric air into a system which is normally under vacuum. Beginning first with the start button I8, there is a suction line I20 which leads to one side of a pneumatic onand-oiI valve. Communication is established through this valve to the suction pump. It might be noted in connection with Figure 16 that all of the dotted lines lead directly. to the pump without any intervening valve so that they are constantly under suction while the machine is operated, whereas th solid lines represent tubes which are connected through intervening valves to the suction lines.

The stop button 8 connects through a line IN to the other side of the on-and-off valve, the onand-off valve being designated generally as I22. In order that the invention may be more fully understood, brief reference should be made to the construction of the on-and-oii' valve, Figure 17 showing a section through a typical pneumatic on-and-ofl valve. The valve I22 ha a central chamber A. There is an opening through the upper wall of this chamber, and opening through the lower wall of this chamber and above the chamber A there is a pneumatic pouch chamber B, and below the chamber A there is a similar chamber C. A valve member designated E is positioned in the chamber A, and by reason of gravity it normally closes the port between the chamber A and the chamber C. The valve E has an upwardly extending valve stem e and a downwardly extending valve stem e. The upper valve stem e is permanently attached to a flexible diaphragm F in the pouch chamber B. In the chamber C there is a similar diaphragm G which is positioned below the valve extenson e". A pipe nipple H, which in the case of the valve I22 communicates with the writing pneumatic 58 opens into the chamber A. Leading from the chamber C on that side of the chamber which is above the diaphragm G is a nipple I which communicates to the suction pump. Opening into the chamber B below the diaphragm F is a port J that communicates to atmosphere. The pipe I28 from the start button communicates through a suitable nipple to the chamber C under the diaphragm G and a similar nipple opening into the chamber B above the diaphragm F communicates with the stop button. There is a by-pass K from the underside of the diaphragm C to the suction nipple I which by-pass has only a very restricted bleed orifice therein at k. Around the diaphragm 1" there is a similar bleed passage L in which is a bleed orifice I.

When the suction pump is not operating, the valve E closes the communication between the chamber A and the chamber C which in turn communicates with the suction pump through the outlet I. When the suction pump is started up, the valve remains in this position. Any air above the diaphragm 1' cannot be exhausted through the bleed passage L because of the valve E to the suction outlet I being closed at this time. Suction tends to hold the valve E closed and tends to hold the diaphragm G down when the pump is started and while the pump is operating. When an impulse of atmospheric air from the start button enters the tube I28, there is then atmospheric pressure under the diaphragm G and suction above it. This lifts the diaphragm G unseating the valve E and raising the diaphragm F. The valve E then seats against the port in the upper wall of the chamber A closing of! any atmospheric air that might enter the chamber A from the port J and the suction nipple H leading from the writing pneumatic is then in direct communication with the pump causing the writing pneumatic to collapse. As soon as the chamber A is put under vacuum by the lifting of the valve E, any air above the diaphragm F is exhausted through the bleed passage L, and atmospheric air entering the port J tends to hold the diaphragm 1" up keeping the valve in this position. The parts remain in this position until something disturbs this condition of balance. Ii air is admitted to the stop line I as for example by pressing the button 8 atmospheric air enters the chamber 3 above the diaphragm 1" so that there is then atmospheric pressure on both sides of the diaphragm F and the valve E drops down to its original position, this cuts oi! the suction to the nipple I! so that the writing pneumatic can expand. A bleed opening is normally provided to permit the restoration 0! atmospheric pressure to the interior of the writing pneumatic when this condition occurs as will be readily understood by those skilled in the art. The writing pneumatic is thus controlled by an on and oi! valve. The tube I28 in Figure 16 Is the tube leading from the chamber A of the on and of! valve to the writing pneumatic. Through the use of an on and of! valve in this position the writing pneumatic will remain collapsed as long as the machine continues to operate and as long as no opposing impulses of air are admitted to the 01! side of the valve. As soon as air is admitted to the of! side of the valve, the valve stays closed until there is apositive admission oi air to the on or start side oi the valve. This has numerous practical advantages one of which is that ii the machine is stopped or shut down. as for example by the pulling out of the electric cord which connects the motor to the source of current, the restarting oi the motor will not cause the writing pneumatic to continue the forward operation of the machine so that suction can be built up in the system before the record starts to move forward, and then the record starts to move forwardly only when the start buttonis manually operated. The on-and-oif valve is also of convenience in correcting records and in connection with the making of nil-ins where part of a letter Is to be manually written. The use of an on-and-oir valve between the start and stop buttons and the writing pneumatic also simplifies the pneumatic circuit for automatic selection.

One or .the ports p controlled by the valve button 88 is connected by a tube I28 to the start line I28. With this arrangement, when the valve-operating finger I is in the intermediate position and is rocked by operation of the pneumatic I02, an impulse of air is admitted to the start line in the same manner as if the button I0 were depressed. A second port p is connected through line I24 to a secondary valve I25 to the suction pump, the secondary valve being a pneumatic relay which, when an impulse of air is admitted thereto, connects the line I26 with the suction pump. The line I26 leads through a cut-off valve I 21 and tubes I 28 to the pneumatic brake pneumatics I29 and I30. When suction is created in the line I28 collapsing pneumatic I29, a brake is applied to the record spool holder and at the same time pneumatic I30 is collapsed and applies a brake to the take-up spool. This brake mechanism will hereinafter be described. The valve I 21 is a simple cut-off valve having a stationary movable disk shown in

Figtires

6, 7 and 8. The purpose of the valve I2'I is to close off the suction between the brake line I28 and the secondary valve I25 so that the brake pneumatics I28 and I20 cannot be collapsed when the writing pneumatic 58 is collapsed as otherwise the brakes and the drive would be operating at the same time, and in opposition to each other.

The valve I21 has a movable cut-ofi disk I2Ia with an operating extension or pin I2'Ib thereon. As shown in Figure 3, the writin pneumatic 58 is. provided with an extension in the form of a strip metal finger 58a that is turned down at its end and through which the extension I 2112 of the valve passes, the arrangement being such that when the pneumatic 58 collapses, the valve disk I 2111 is rotated in one direction and when the pneumatic opens, it moves in the other direction. As shown in Figure 8, the movable disk I2'Ia has a groove that cuts off and establishes communication with ports in the fixed member of the valve. The fixed member I2Ic has two nipples leading therefrom one going to each of the brake pneumatics whereas in the diagram this is illustrated as a single line I28 having two branches.

The port p in the neutral position of the selector valve communicates with a tube I3I leading to the off side of an on-and-oif pneumatic I33 which is similar in construction to the on-andofi. pneumatic I22. The on-and-ofi pneumatic I33 controls a tube I34 leading to the rewind pneumatic 4I. When the on-and-off pneumatic I33 is in the on position, suction to the rewind pneumatic is established to collapse th's pneumatic. The fourth port p of the neutral position controlled by a button 93 connects with a tube I35 leading to an on-and-ofi pneumatic I36 similar to I33 and which through tube I 31 controls the skip forward pneumatic 43. By reason of the arrangement of the

ports

71 and 12 when the button 93 is depressed to operate the writing pneumatic, the rewind and skip forward pneumatics are both turned to the off posit on through their respective on-and-off valves I33 and I36.

The push button 32 of the selector valve controls two ports one of whichdesignated p in the diagram leads through tube I38 to the on side of the on-and-off pneumatic I33 for collapsing the rewind pneumatic. The other port p in ths position communicates to the tube I35 leading to the off side of pneumatic I36 so that when the. rewind pneumatic 4| is operated by operation of the button 92, the skip forward pneumatic is sure to be turned to the oil position through an impulse of air admitted to the on-and-off pneumatic-I36.

The push button 84 of the selector valve controls two ports. Port 1) connects through tube I39 to the on side of the on-and-ofi pneumatic I38 so that when button 94 is depressed, the onand-off valve I36 is turned to the on position to energize the skip forward pneumatic 43. The push button 94 also controls port 1) which connects to the tube I3I leading to the off side of the on-and-off valve I33 so that when valve I36 is in the on position, I33 is certain to be in the oil position.

The tracker bar I8 has an opening I8a that connects to a tube I40 designated a rewind tube that leads to a secondary valve I4I. As previously explained, a secondary valve is a pneumatic relay through which the small impulse of air entering the tracker bar opening I8a is utilized to connect the relatively large valve-actuating pneumatic I02 with the suction pump, the valveoperating pneumatic I02 communicating to the secondary valve I4I through a tube I42. Tube I40 has a branch I43 leading to the manually operated rewind button 8. The opening I8a is intended to be controlled by a perforation in the record roll passing over the tracker bar. The tracker bar has another opening at I8b that communicates with a tube I44, designated repeat which connects with the tube I40. The tracker bar has a third opening I8c that connects through a tube I45 that connects into the line I2I leading from the stop button so that the movement of the record over the tracker bar may serve to stop the drive in the same way that the manual operation of the stop button 9 will stop the drive.

The drive release valve 64 has two tubes leading therefrom. The first tube I46 leads to a primary valve I41 which renders the typewritter key-actuating selector inoperative when either the rewind pneumatic or the skip forward pneumatic is energized so that the typewriter keys will not operate when the record moves at high speed in a forward or a reverse direction over the tracker bar. The other tube I48 connects into the stop line I2I so that the writing pneumatic 58 will go to the all position when either the rewind or the skip forward pneumatic is energized.

The brake pneumatic I23 serves to contract a brake band which operates about a hub ISA (see Figure 2) on the outside of the plate I6 which is at the end of the stud shaft which carries the rewind and record-holding flange I8 (see Figure 3). The brake pneumatic I30 operates a similar brake band on the drum 28 (see Figure 3) at the lefthand end of the take-up spool shaft 21. The rewind brake is designated generally as I49, and the other brake mechanism on the take-up spool is indicated generally at I50.

Assuming that a record roll has been placed in the machine and that all of the indexing pins have been properly set and the first letter which the operator wants to write is the third letter on the record roll, the knob 82 is turned in the manner hereinbefore described to bring the lock or latch IIO opposite the proper indexing pin. This turning of the knob advances the disk to the front of the pin 14 on the gear wheel I3 causing the valve finger I00 to be in the position shown in Figure 14 where it is in position to operate the valve button 34. The operator then presses the start button whereupon the writing pneumatic 56 is energized to start the record winding forward I slowly. As the record moves forward slowly a hole in the record uncovers the port IBb in the tracker bar letting an impulse of air into the line I labeled repeat. This instantly causes the operation of the pneumatic I02 to operate the valve finger I and depress the valve 94. This in turn energizes the on-and-oif valve I36 so that the skip forward pneumatic is actuated causing the high forward speed drive disk 35 to engage the flange 25 of the take-up spool and the record is driven forwardly at a high speed. At the same time the drive release valve 64 is operated to release the writing pneumatic 50 and render the key action of the typewriter inoperative. As the record drives forwardly at high speed the sear wheel I3 is turned in a clockwise direction. At the proper time it engages in the notch 00a of the disk 80, starts to rotate this disk causing the shaft 84 to move down. This in'turn rocks the valveoperating finger I00 to the neutral position and if the index pins have been properly set, at the time the finger I00 is in the neutral or intermediate position, a second opening in the record, either in the rewind or repeat position on the record uncovers one of the openings Ila or Ilb admitting an impulse of air to line I 40 to again actuate the pneumatic I02 which rocks the valveoperating finger I00. At this time the valve finger is in the neutral position and the intermediate button 93 is depressed. Depressing this button causes an impulse of air to be admitted through port 12 immediately applying the brakes to check the forward high-speed travel of the record roll. Next it admits air to the start line I20 energizing the writing pneumatic 58. At the same time it operates the on-and-ofi valve I36 to the off position to restore the skip forward pneumatic to a neutral position and releases the high-speed drive, When the skip forward pneumatic returns to its neutral position, the drive release valve 64 is closed and as the record then moves forward at writing speed, the key action is made effective. As the record continues to drive forward at slow speed, the pin 14 on the worm wheel 13 rotates the disk 80 to an over-center position throwing the valve-operating finger I00 up to the position shown in Figure where it is over the rewind button 92. When the end of the part of the record which is to be used is reached, an opening in the record again uncovers either the port I80 or IBb causin an impulse of air to enter the line M0 to again operate the pneumatic I02 and causing the valve finger I00 to press the button 92 in. This causes the rewind pneumatic to be energized so that the record will start to rewind at high speed. It causes the drive release valve to be opened rendering the key action inoperative. It admits air to the stop line of the writing pneumatic 58 rendering this pneumatic inoperative which in turn causes the brake valve I21 to be set to an open position. As the record rewinds, the worm wheel I3 is driven in a counterclockwise direction and the pin I4 engages the disk 80 to rotate it. When the valve finger I00 is again in the neutral position, an opening in the record roll will uncover the port I8b of the tracker bar, operate the pneumatic I02 and cause the valve-operating finger I00 to be pressed in to again engage the button 93 and the record will then start winding forwardly again at the normal writing speed. The selected portion of the record will thus continue to write forward at slow speed and rewind until the knob 82 is changed to a different position. The knob 82 can be changed to a different position during the writing of a letter and it will not affect the operation of the record; it will merely change the position of the valve-operating finger I 00 and the record drive will not be aflected until one of the ports Ila or Ilb on the tracker bar has been uncovered. Then the record will rewind or continue to travel ahead according to whether the disk is in advance of or behind the pin 14. It should be explained that when the record is repeated and then started forward to write agin, an opening is usually provided in the tracker bar to register with the opening I0c so as to automatically stop the machine Just before the portion of the record to be used moves over the tracker bar, giving the operator of the typewriter time to remove the letter previously written and insert a new sheet of paper and make such manual fill-ins as she may have to make. After the machine is stopped in this way it is of course started by manually pushing the start button.

The selector mechanism providing as it does a relatively movable driven member and a manually adjustable member with the disk 00, together with the contacts whereby relative movement between the gear and the adjustable disk 80 is converted at the proper time to a reciprocating motion, is a unique mechanical movement in itself, and the use of such a movement as a selector mechanism is novel and provides a positive and easily operable selector. The arrangement whereby the valve finger I00 is shifted mechanically by relative movement between the gear 13 and the disk 80 and whereby the finger is depressed pneumatically under the control of the record itself is also a novel arrangement. It is very much more simple than mechanisms heretofore provided for this purpose. Moreover, the selector unit as a whole is one wherein the selection of the next portion of the record to be used may be made during the operation of the machine and while it is using a different portion of the record. The indexing is very easily accomplished through the use of the removable pins I 09 in conjunction with the pointer which moves over the indexing disk as the record moves.

The drives for the record spools are of simple and unique construction. The pneumatic clrcuit, particularly in the employment of an onand-oif valve for the drive pneumatic and in the employment of separate on-and-off valves for the skip forward and rewind pneumatics, constitutes a unique and desirable arrangement and one which lends itself to use with the particular type of selector employed. The pneumatic circuit is further unique in the provision of the relief valve operated by movement of either the skip forward or rewind pneumatic and constitutes a simple way of rendering the forward drive pneumatic inoperable when either of the first two above-mentioned pneumatics are operated. The provision of the brakes on the rewind and take-up spools enables the spools to be free-running at all times except when the motion of the record is to be stopped, and the provision of the cut-off valve operated by the drive forward pneumatic renders the application of these brakes inoperative when the record is being driven forwardly slowly.

Numerous other features of novelty and other advantages will be apparent to those skilled in the art. It will be understood that while I have specifically described one preferred embodiment of my invention, the invention is not restricted to this particular construction and arrangement of the parts and various changes and modifications may be made in the parts within the contemplation of my invention and under the scope of the following claims.

I claim:

1. A pneumatic record mechanism of the class described comprising a flanged record spool holder and a flanged take-up spool, a friction wheel disposed between the peripheries of the two flanges, means for driving the friction wheel, means for reciprocating the friction wheel into contact with either one or the other of said flanges for driving one or the other of them, said means comprisng opposed pneumatics connected together, a second forward drive for the take-up spool, pneumatically operated means for rendering said second forward drive operative, pneumatic circuits whereby said opposed pneumatics are in a neutral position when the second forward drive is operative, and a relief valve operated by the movement of either of said opposed pneumatics for rendering the forward drive inoperative when said friction wheel is engaging the periphery of one or the other of said flanges.

2. A pneumatic mechanism having opposed record spools, means for driving the record spools in a forward direction or in a rewind direction at relatively high speed, a slow speed forward drive for one of the spools, a pneumatic for rendering said slow speed forward drive operative, pneumatically operated brakes for the record spools, and valve means in circuit with said pneumatic for rendering the brakes inoperative when the slow speed forward drive is operating.

3. A pneumatic mechanism of the class described having a tracker bar over which a record is to be moved, a flanged record spool holding means at one side of the tracker bar, a flanged take-up spool means at the other side of the tracker bar, a friction wheel between the said two flanged means movable from a neutral position where it frictlonally engages the flange of one or the other of said means, means for continuously driving said friction wheel, means for shifting the friction wheel from the neutral position into position to engage the periphery of the flange of one or the other of said means, said last-named means comprising opposed connected pneumatics and pneumatic circuits including an on-and-off valve for each pneumatic for operating said pneumatics, valve means for controlling the on-and-off valves in such manner that when one is in the on position, the other is in the off position, a second driving means for the take-up spool means, a pneumatic for rendering said second drive means operative, an on-and-off valve for controlling said last-named pneumatic, and a drive release valve operated by the opposed pneumatics for rendering said last-named pneumatic inoperative when either of said two onand-off valves is in the on position.

4. A pneumatic mechanism of the class described having a record spool unit with a skip forward and rewind drive mechanism and having a normal forward drive mechanism, a pneumatic circuit for controlling said mechanisms, said circuit including a selector valve having three push buttons, one being a skip forward button, one a rewind button and one a forward drive button, a mechanical finger for selectively operating any one of said buttons. a combined manually adjustable and record spool driven means for moving said flnger into position to engage a selected one of said buttons, and pneumatic means for operating the flnger to depress the selected button.

5. A selector mechanism for pneumatic actions comprising a valve-operating finger selectively movable in a plane to difl'erent operating stations, a push button valve at each station, and means for moving said flnger in a direction normal to the first named plane of movement for depressing said push button valves, said lastnamed means comprising a single pneumatic effective at any position to which the flnger is moved in said first plane.

6. A selector mechanism for pneumatic actions comprising a record and record spool mechanism, a valve-operating finger selectively movable in a plane to different operating stations, a push button valve at each station, means for moving said finger in a direction normal to the plane of the first movement for depressing said push button valves, said last-named means comprising a pneumatic, and a combined manually adjustable and record-spool driven mechanism for moving the finger to the different stations.

7. A mechanism of the class described comprising a carrier having transverse shaft and an axially extending shaft mounted thereon, said shafts each having an offset arm thereon, the arms of the two shafts being in parallel planes and being pivotally connected to each other whereby rotary movement of the former shaft imparts a reciprocating movement to the latter, a relatively movable driven member adjacent the carrier, and cooperating means on said driven member and on said transverse shaft for imposing a limited rotational movement to the transverse shaft upon relative predetermined movement of the driven member past the center of said transverse shaft.

8. A mechanism of the class described comprising a carrier having a transverse shaft and an axially extending shaft mounted thereon, an adjusting knob for rotating the carrier, said transverse and axially extending shafts being pivotally connected to each other through offset arms extending radially from each shaft whereby rotary movement of the former imparts reciprocating movement to the latter, a relatively movable driven member concentric with said axial shaft adjacent the carrier, and cooperating means on the driven member and on said transverse shaft for imparting a limited rotational movement to the transverse shaft upon movement of a given point on the driven member past the center of the transverse shaft.

9. A mechanism of the class described comprising a carrier having a transverse shaft and an axially extending shaft mounted thereon, an adjusting knob for rotating the carrier, said transverse and axially extending shafts being pivotally connected to each other through offset arms extending radially from each shaft whereby rotary movement of the former imparts reciproeating movement to the latter, a relatively movable driven member concentric with said axial shaft adjacent the carrier, cooperating means on the driven member and on said transverse shaft for imparting a limited rotational movement to the transverse shaft upon movement of a given point on the driven member past the center of the transverse shaft, an indexing disk adjacent said knob, and a pointer operated by the driven member movable about the indexing disk.

10. A mechanism of the class described comprising a carrier having a transverse shaft and an axially extending shaft mounted thereon, an adjusting knob for rotating the carrier, said transverse and axially extending shafts being pivotally connected to each other through offset arms extending radially from each shaft whereby rotary movement of the former imparts reciprocating movement to the latter, a relatively movable driven member concentric with said axial shaft adjacent the carrier, cooperating means on the driven member and on said transverse shaft for imparting a limited rotational movement to the transverse shaft upon movement of a given point on the driven member past the center of the transverse shaft, an indexing disk adjacent said knob, a pointer operated by the driven member movable about the indexing disk, and cooperating means on the indexing disk and the knob for releasably holding the knob in the position to which it is adjusted.

11. A mechanism of the class described comprising a carrier having a transverse shaft and an axially extending shaft mounted thereon, an adjusting knob for rotating the carrier, said transverse and axiall extending shafts being pivotally connected to each other through offset arms extending radially from each shaft whereby rotary movement of the former imparts reciprocating movement to the latter, a relatively movable driven member concentric with said axial shaft adjacent the carrier, cooperating means on the driven member and on said transverse shaft for imparting a limited rotational movement to the transverse shaft upon movement of a given point on the driven member past the center of the transverse shaft, an indexing disk adjacent said knob, and a pointer operated by the driven member movable about the indexing disk, said means including shiftable indexing pins on the indexing disk and a reciprocable latch member on the knob.

12. A mechanism of the class described comprising a carrier having a transverse and an axial shaft carried thereby, each of said shafts having a radially extending arm thereon, the terminal 4 in said member whereby relative movement of the notched member past said means causes the transverse shaft to be rotated.

13. A mechanism of the class described comprising a carrier having a transverse and an axial shaft carried thereby, each of said shafts having a radially extending arm thereon, the terminal portions of the two arms being pivoted together whereby a rotational movement of the transverse shaft will impart a reciprocating movement to the axial shaft, a notched memher on the transverse shaft, a wheel-like member concentric with the axial shaft adjacent the carrier having means thereon to engage the notch in said member whereby relative movement of the notched member past said means causes the transverse shaft to be rotated, a valve-operating finger movable in a plane by the axial shaft to any one of several diflerent operating positions. push button valves at each position to which the finger is movable, a pneumatic cooperating with the finger for moving it in a direction normal to the said first plane of movement for depressing a selected push button, a record spool mechanism and drive controlled by the push button valves, means for driving the wheel-like member from the record spool mechanism, and record-controlled means for operating said pneumatic.

14. A pneumatic mechanism of the class described having a tracker bar and record spool driving means for moving a record over the tracker bar in forward and reverse directions at high speed, and other means for moving the record over the tracker bar at slow speed. a selector valve for determining the direction of movement of the record, said selector having three diflerent valve elements, an operating finger movable to engage any one of said valve elements, a cornblned manualhr-adjustahle and record-spool driven means for shifting said finger to determine which of said elements shall be operated, and record-controlled means for operating the finger after the finger has been shifted to a selected position.

GEORGE W. GARIBON.