US2180793A - Driving mechanism for pneumatic actions - Google Patents

Description

5 Sheets-Sheet l INVENTOR Filed March 10, 1956 DRIVING MECHANISM FOR PNEUMATIC ACTIONS D N 6m 5 Sheets-Sheet 2 at Nb g .E. 6 Q

Nov. 21, 1939. G. w. CARLSON DRIVING MECHANISM FOR PNEUMATIC ACTIONS Filed March 10, 1936 DRIYING MECHANISM FOR PNEUMATIC ACTIONS Filed March 10, 1936 5 Sheets-Sheet 3 I I I I I I I I I I I I i I L mm h% b b mm NM bw @v E n r awn. .C. l 9.3 n .1: mm w w d mum I l 4 V aw fi b M b m3 .0 no m6 U b Nod. I l l .Qw

DRIViNG MECHANISM FOR PNEUMATIC ACTIONS Filed March 10, 1936 5 Sheets-Sheet 4 INVENTOR M 4km MwMzm IOV- L1, 1303- G. W CARL-SUN I' DRIVING MECHANISM FOR PNEUMATIC ACTIONS Filed March 10. 1936 5 Sheets-Sheet 5 INVENTOR ratentea NOV. 41 1a La,.lUU,l do) UNITED STATES PATENT OFFICE DRIVING MECHANISM FOR PNEUMATIC ACTIONS George W. Carlson, Pittsburgh, Pa., assignor to Robert H. McClintic, Pittsburgh, Pa.

Application March 10, 1936, Serial No. 68,071

15 Claims. (Cl. 24255) This invention relates to a driving mechanism winding systems, the present invention provides for use in pneumatic actions of the type wherein a winding and rewinding mechanism which is the perforated record sheet is wound from a considerably more Compact and Simple than spool over a tracker bar onto a take-up spool mechanisms heretofore used. The present inuntil the end of the record has been reached, t o reover, p vides s mp fied p eu at c 5 and which thereupon revers nd rewinds i circuits through which the various operations are the opposite direction atarelatively higher speed. controlled. The invention further D V S a Pneumatic actions of this general type h e record driving mechanism which can be easily been designed for use in automatically operating dj d to in re se or decrease the forward 10 typewriters. Where a large number of similar pe f e re d 01 according to eq letters are to be written, automatic typewriters sare employed. A record is made in accordance The invention y be readily Understood y with the letter to be written. When this record reference to h mp i drawings in which is placed in the automati t writ r d th Figure 1 illustrates a side elevation of a driving typewriter set into operation, the keys of the mechanism embodying the present invention and 15 typewriter will be operated as the record moves showing the same in C ju With a ypethrough the machine. When the writing of the r r; letter has been completed, the record is auto- Figure 2 s a S de elevation on a Somewhat matically rewound and may automatically start larger scale showing the Spool Winding d eto repeat. In the use of automatic typewriters of winding me 20 this character, the operator puts a sheet of paper Figure 3 S a p p w O t e mec anism in the typewriter and then pushes a start button shown in Figur 2, the peril of the ac e bewhereupon the machine automatically writes in tween the two sides of the frame being broken the date and then stops. The operator fills in away, the view being also more or less schematic, the name and the address of the party to whom showing the pneumatic circuits for the stop and 25 the letter is directed and again pushes the start start mechanism;

button. The machine will thereafter write the Figure 4 is a view similar to Fi 3, but ShOW- letter. It may be that the name of the addressee g he pneumatic c cu for effecting the is to appear in the body of the letter or that some wind and repeating of the record;

special fill-in is to be made in the letter. Figure 5 is a fragmentary view showing one of 30 Where this is the case, the record and machine the manually operable valves; are so made that where such a name or fill-in is Figure 6 is a top plan view of the driving to appear, the machine will stop. The operator mechanism at one side of the machine frame; will write the fill-in manually and again press Figure '7 is a rear end view of that side of the the start button. machine shown in Figure 6; 35

One operator can attend to several machines. Figure 8 shows a top plan View of the mecha- When the end of the letter has been reached, nism at the other side of the machine frame, and the perforation in the record causes the record Figure 9 is a rear end view of that part of the to be rewound. While the record is rewinding, mechanism shown in Figure 8.

40 the operator may insert a fresh piece of paper In the drawings, 2 designates a supporting 40 in the machine. The record may be arranged to frame having upstanding side portions 3 and 4. automatically set the typewriter into operation The forward or left hand side of the frame as when the rewinding is completed or this may be shown in Figure 1 provides a platform or support done manually: for a typewriter A or other mechanism to be 5 While the driving mechanism of the present operated. The frame 2 preferably contains a application is adapted for use in any pneumatic support between the two side plates 3 and 4, a action, it is particularly useful for pneumatic pneumatic selector and a rocker bar action, as actions for operating typewriters and similar defully illustrated and described in my copending vices. In the present application the invention application Serial No. 68,068, filed March 10,

0 has been particularly described in conjunction 1936 and which is not illustrated in the present with a typewriter, but it will be understood that invention, the same forming no part thereof this is by way of illustration and not by way of per se. Extending across between the side plates limitation. 3 and 4 at the top of the machine frame is a While pneumatic mechanisms heretofore contracker bar 5 having a row of holes therein, the

structed have employed record winding and retracker bar being similar to those now generally used in pneumatic actions. To the rear of the tracker bar, i. e., to the right as viewed in Figures 1, 2, 3 and 4, is a space to receive the removable record spool, and to the left of the tracker bar as viewed in these figures is the takeup spool 6. The core of the removable record spool is designated 1. The machine is provided on the upstanding side 3 with a stud shaft 3 having a centering flange 9 on its inner end for engaging and holding one end of the record spool or roll I. The other upstanding side portion 4 of the frame 2 has a stud shaft I!) carrying a spool-engaging disc ll. Surrounding the shaft I U on the outside of the upstanding side 4 of the machine frame is a barrel I 2 in which is contained a spring for normally urging the shaft l toward the left as viewed in Figure 9, by means of which member H is yieldably held in engagement with the core of the record roll, the arrangement being generally similar to that provided for removably holding the records in player pianos and similar pneumatic actions.

Referring now to Figure 1, the driving motor for the entire machine, which motor is designated is located inside the frame 2. It is provided with a driving pulley M. A belt, preferably a V type belt Ma, transmits motion from the pulley M to a large pulley l5. The large pulley I5 is provided with a reel and clutch unit it for operating a carriage return tape 1?. The preferred construction and arrangement for operating this clutch and reel is disclosed in my copending application Serial No. 61,355, filed January 29, 1936. Also at the center of the pulley i5 is a smaller pulley it; around which passes a belt l9, the belt is serving to transmit motion to a fourth pulley 20. The belt arrangement is such that a speed reduction is provided between the motor pulley i4 and the pulley 20. The pulley 28 is on the end of a crank shaft 2| for operating a pneumatic suction pump 22 of the bellows type, the pump 22 being located within the frame 2. The pulley 2!] also has at its center a sprocket wheel 23.

Secured to the outside of the portion 3 of the frame 2 above the pulley and sprocket wheel Ell-23 is a sprocket wheel 24. A chain 240 serves to transmit motion from the sprocket 23 to the sprocket 24, the diameters of the two sprockets being such as to effect a further speed reduction. The sprocket wheel 24 is provided with a peripheral flange portion 24a and is provided near the center with a mitre gear 24b. Formed on the side plate 3 is an outwardly extending bracket or lug 25 providing a bearing for one end of a shaft 26. Formed on the member 3 is a second lug or bracket 21 which carries a pivot'ZB from which hangs a link 29, this link having a bearing 36 for the other end of the shaft 26. Below the bearing 30 the link 29 has an extension 29a. Secured to the shaft 26 to mesh with the gear 241) is a miter gear 31. Also mounted on the shaft 26 is a friction wheel 32 having a flanged hub portion 33. The flanged hub portion 33 is engaged by a yoke 34 which yoke has an upper portion 34a through which is threaded an adjusting screw 35. By turning the screw 35 manually, the yoke 34 can be moved to the right or left as viewed in Figure l, as desired. In the side plate 3 is a window or opening 36 through which the periphery of the friction wheel 32 projects to engage against the flanged end of the take-up spool 6. The friction wheel 32 is provided with a driving finger 32a cooperating with a dog 3'! on the shaft 26, the dog and finger arrangement serving to transmit motion from the friction wheel to the shaft while enabling the friction wheel to be adjusted axially along the shaft.

Secured to the extension 29a at the lower end of the link 29 is a cross rod 38 best shown in Figures 3 and 4. This cross rod is provided with a collar 39. Around the rod 38 and confined between the collar 39 and the inner face of the portion 4 of the frame is a compression spring 48. The spring 40, acting against the collar 39 pushes the rod 38 in a direction such as to swing the link 29 on its pivot 23 to hold the surface of the friction wheel 32 out of driving engagement with the flanged end of the take-up spool 6. Secured to the outside of the portion 4 of the frame is an actuating device for moving the rod 38 in a direction opposed to that in which the rod is urged by the spring 40. This mechanism preferably comprises a pneumatic 4| having a movable leaf 42. The pneumatic, as is customary in pneumatics, has a fulcrum point at 43 which is the small end of the pneumatic. Secured to the movable leaf 42 of the pneumatic is a strip 44 which projects past the fulcrum point 43 and through which the end of the rod 33 passes, the rod 38 being provided with a nut 38a which bears against the end of the strip 44. In Figure 3, the pneumatic is shown in its collapsed position. In this position the strip 44 is acting to exert a pull on the rod 38 against the compression of the spring 40 to hold the friction wheel 32 in engagement with the end flange of the take-up spool 6. When air is admitted to the pneumatic to allow it to expand the leaf 42 swings up as viewed in Figure 4, so that the extreme left hand end of the strip 44 moves down as viewed in the same figure, allowing the spring 40 to act to push against the link 29 to move the friction wheel 32 out of driving engagement with the end of the take-up spool.

The movement required to engage and disengage the friction drive is slight. At no time is the movement of the shaft 26 transversely to its axis sufficient to cause the gear wheel 3| to disengage from the pinion 24a. The fixed bearing 25 is loose enough to permit the required movement of the shaft. The pneumatic circuit for controlling the operation of the pneumatic 4! will hereafter be described.

The stub shaft 8 which supports the record spool centering and holding flange 9 is provided with a friction wheel 45. Pivotally supported on the side frame 3 at 46 is a lever 41, one end of which is bifurcated and which supports an idler roller 48. The other end of this lever is connected to a vertically extending link 49 secured at its opposite end to an extension 50 of an actu ating device, preferably a collapsible pneumatic 5|. The bottom leaf of the pneumatic is rigidly secured to the frame 2 while the movable upper leaf of the pneumatic has a tilting support at 52. The arrangement is such that when air is exhausted from the interior of the pneumatic 5|, the upper leaf thereof tends to move down, exerting an upward thrust on the link 49. This in turn urges the roller 48 down tightly against the peripheral flange 24a of the sprocket wheel 24 and also against the friction roller 45 on the stub shaft 8. When this occurs, motion is transmitted from the sprocket wheel 24 to the record spool to effect a rewinding of the record. The diameter of the friction pulley 45 is relatively small as compared with the diameter of the flange 24a, so that the record spool is operated at a relatively high speed for rewinding.

The contrary is, of course, true insofar as the drive for the shaft 26 is concerned, because the pinion 3| has a relatively large diameter as compared with the pinion 24b. The drive is thus one where the movement of the record forward under the operation of the take-up spool is relatively slow as compared with the rewinding under the control of the idler roller 48. When atmospheric pressure exists in the pneumatic 5|, the roller 48 is lifted slightly off the periphery of the flange 24a on the sprocket wheel 24 so that it does not normally drive the record spool. For opposing the pneumatic 5| and returning it to its expanded position, there is provided a link 53 having its upper end attached to the free end of a leaf spring 54, which spring is anchored to a fixed bracket at 55. The spring 54 is curved to pass under the friction pulley 45 and carries a pad at 54a. When the pneumatic 5| collapses it flexes the spring to move the pad 54a out of contact with the pulley 45. When atmospheric pressure is restored to the pneumatic 5|, the spring 54 flexes back, and the pad 54a exerts a slight pressure against the pulley 45, thus preventing the record spool from coasting, particularly when the record is being wound'off the record spool onto the take-up spool, thus serving to keep the record under proper tension over the tracker bar.

In the operation of the machine, when the motor is turned on the suction pump shaft 2| is continuously driven and the sprocket" wheel 24 and the shaift'ZG are continuously driven. When the pneumatic 4|" is collapsed to cause the shaft 26 to drive the' take-up spool, the pneumatic 5| for the rewind mechanism must, of course, be expanded. At the moment when the rewind is to take place, the pneumatic 4| is expanded and the pneumatic 5| is collapsed. Moreover, it is necessary to stop the record for fill-ins. In such cases, the pneumatic 4| is expanded but no operation of the rewind pneumatic 5| takes place at that time. According t'othe preferred embodiment of the'present invention, the pneumatic circuits are such that thevarious functions of the pneumatics are manually controlled and are also controlled by the record sheet; The record sheet itself is designated'B in Figure l.

The majority of the openings inthe tracker bar are for controlling the operation of the character keys on the typewriter or'other device to be operated by the pneumatic'mechanism. Cer-' tain holes in the tracker bar, however, are for controlling the operation of functions other than the character keys arid for controlling the travel of the record sheet. Some of such other functions are designated by the legends inliigure 6.

In Figure 3, tracker bar hole a is thehole which controls thestopping of the forward movement of the record. In Figure 4, hole b is for controlling the repeating of the record,-'a'rid"hole c is for controlling the rewind of the record. Manually operable push button valves are "also provided, these preferably being located at a point convenient to the key board of the typewriter. Push button" a is for controlling the stopping of the record manually. Push button d. is for starting the record. Push button I) is for manually effecting the repeating of the record, and push button c is for manually effecting the rewinding of the record. The push buttons 0. and d are shown mounted on a panel separate from the push buttons 27' and 0, because in the actual assembly of the various parts there is one panel of push buttons at each side of the key board of the typewriter. The push button valves are all of similar construction and may be readily understood by reference to Figure 5 which represents a section through a typical valve.

In this figure, 56 designates the supporting panel having a push button 51 therein which has an extension 58 which bears against a leaf spring 59. This leaf spring 59 has a pad thereon which normally closes the outlet end of a passage 60 leading to a tube connection 6| to which a rubber hose or other tube can be connected. Normally, the pad on the spring 59 prevents atmospheric air from entering the passage 60. When the push button 51 is depressed, however, the pad uncovers the terminal of the passage 68, allowing atmospheric air to enter. The pneumatic circuit'for the pneumatic 4| will first be described. Leading from the pneumatic 4| is a tube which communicates with a passage 66 in a control valve casing C. Passage G6 terminates in a port 61 in which is a pneumatic valve 68. In the position shown in Figure 3, the top of the pneumatic valve 68 closes the port 61 while the bottom of this valve is unseated so that the passage from passageway 66 into chamber 69 is open. Chamber 69 communicates with apassage 10 which in turn is connected with a tube 1| leading to the vacuum or suction pump more or less schematically illustrated at 12. At the top of the valve 68 is a chamber 13 opening to atmosphere through passage 14. Below the valve 68 is a pouch or diaphragm 15. At 16 is a passageway through which fluid may be admitted to the underside of the pouch 15. The passage 16 has a branch 11 leading to a second passageway 18 opening to one side of a pouch 19. Opening to the same side of the pouch 19 is a passageway communicating to tube 8|. This tube has a T in it designated 82, and one branch thereof leads to the tracker bar opening a while the other branch connects to the manually controlled valve a. The other branch of passage 16 in the valve casing C opens under a pouch or valve 83 which is normally pressed down by a light spring 83' to close the end of the passage 16. Also opening under the valve or pouch 83 is a passage 84 leading to atmosphere.

In the same chamber as the pouch 19 is a second pouch 85. There is a fluid passageway 86 opening to the under side of this pouch, and at 81 is a bleeder cup providing a limited by-pass of fluid from the passageway 86 to the top side of the diaphragm or pouch 85. A tube 88 leads from the passage 86 to the manually operable start valve 01.

Assuming the machine to be operating with the parts in the position shown in Figure 3, the vacuum pump 12 is maintaining a vacuum in the pneumatic 4| through the circuit comprising the tube 65, the valve port 61, pouch chamber 69, passageway 10 and tube With the pneumatic collapsed, the friction roller 32 is transmitting motion to the end of the take-up drum 6 serving to advance the record. When the record has reached a point where it is to be stopped, for instance, for the operator of the typewriter to make a manual fill-in, a hole in the record sheet will move into register with the opening a in the tracker bar. Atmospheric air will travel through the tube 8| into the passage 18 and passage 11 into passage 16 to the under side of the pouch 15. Since there is vacuum or reduced pressure on the upper side of the pouch 15, the pouch will be expanded upwardly to raise the valve 68 so that the bottom of the valve 68 will close the bottom of port 6'! cutting off suction from chamber 61 and at the same time allows atmospheric air entering passage 14 into chamber 73 to enter port 61 from the top and travel through the passageway 66 into the tube 65 leading to the pneumatic 4|. The pneumatic 4| will, of course, immediately expand, moving the roll 32 out of driving engagement with the record take-up spool.

Since the record will stop almost instantly, the hole in the record sheet admitting air to the passage a will continue to admit air and the record cannot move forward again until the start button d is manually depressed. When the start button d is manually depressed, atmospheric air will enter the tube 88. A vacuum normally exists in the chamber between the two pouches I9 and 85. This is effected by the provision of a devious passage (not shown) leading from the chamber to a pasageway such as 19 exhausting to the vacuum pump. The admission of atmospheric air to the tube 88 to the under side of the pouch I9 causes this pouch to expand or bellow upwardly, compressing the pouch or diaphragm 85 against the ends of the passageways 89 and 18. When this happens, atmospheric air can no longer flow from the tracker bar opening a into the passage 18 and to the under side of the diaphragm I5. A bleeder cup at 69a allows the atmospheric air that is under the diaphragm 15 to exhaust. Thus, as soon as the pouch l9 expands to shut off the at- 'mospheric air through the passage 89'|8, the

pouch 15 will drop down to the position shown in Figure 3, allowing the valve 68 to return to the position shown, connecting the pneumatic 4| with the vacuum pump 12 and shutting off the admission of atmospheric air from the chamber 13 to the passage 66. As soon as the parts have been restored in this way to the position shown in Figure 3, and the pneumatic 4| is operated to set the record sheet in motion, the manual pressure on the start button can be released and the record will continue to move forward until the next stop is reached or until the end of the record is reached.

At the end of the record there will be punched a hole which will move over the tracker bar opening 0. This will automatically expand the pneumatic 4| and energize or collapse the rewind pneumatic 5|. This may be best understood by the circuit diagram of Figure 4. In connection with the diagram of Figure 3, it may be stated by way of explanation that the valve casing C in Figure 4 is the same as the valve casing C in Figure 3, but the section through the casing is taken at a somewhat different point to show the rewind and repeat circuits rather than the stop and start circuits.

Leading from the bottom of the pneumatic 5| is a tube 99 connecting with a passage 9| in a valve casing C. This passage 9| terminates in a valve chamber 92 in which is a double pneumatic valve 93 controlling two ports 94 and 95. Port 94 establishes communication between the valve chamber 92 and a lower chamber 96. The lower chamber 96 connects through a devious passage (not shown) to the connection leading to the vacuum pump. Purely for the purpose of illustration, a dotted line connection is indicated at 96, it being understood, however, that actually the connection is built into the control valve casing 0. Below the chamber 96 is a pneumatic pouch or diaphragm 91. Leading from the under side of the pouch 97 is a passageway 98 connecting with a tube 99. This tube branches, one branch 99' leading to the tracker bar hole 0 and one branch 99a leading to the manual push button valve 0. A bleeder cup I99 provides a restricted opening between the passageway 98 and the chamber 96. Above the double valve 93 is a chamber |9| in which is a diaphragm or pouch I92. A passageway I93 leads from the atmosphere to the under side of the pouch I92, and this passageway also communicates with the port so that with the parts in the position shown in Figure 4 air enters the passageway I93, entering the port 95 around the upper stem of the double valve 93 into the chamber 92 and passage 9|, thus allowing atmospheric air to enter the rewind pneumatic 5|. A bleeder cup I94 provides restricted communication between the chamber |9| and the passageway 9|.

From the valve chamber 92 is a passageway I95 leading to the upper side of the spring-pressed valve member 83, which valve member is also shown in Figure 3. Leading from the chamber |9I is a passageway I96. This connects with a tube I91. The tube divides into two branches, branch I98 leading to the tracker bar opening I), and branch I98 leading to the repeat manual button b.

When the parts are in the position shown in Figure 4, the rewind pneumatic 5| is expanded or de-energized and the take-up pneumatic 6| is collapsed to hold the friction wheel 32 in driving relation with the take-up drum, causing the record to be wound forwardly. When a hole in the record, which hole would normally be at the end of the record, moves over the tracker bar opening 0, air enters this hole and passes down the tube 99 to the under side of the pouch 91. There being a vacuum above the pouch 97, the pouch is lifted up, raising the double valve 93, whereupon the top surface of the valve 93 closes off the port 95 against the entrance of atmospheric air to the chamber 92 and establishes communication from the chamber 92 through the port 94 to the vacuum chamber 96. When this occurs, air is withdrawn from the rewind pneumatic 5| through the tube 99, the port 9| and chamber 92. At the same time, air is withdrawn from the passageway I95, creating a suction above the spring-pressed valve 83. When this occurs atmospheric air can enter the passageway 84 (see Figure 3) pass through the port 83 into the passageway 76 and lift the pouch 75, thus elfecting the admission of atmospheric air to the take-up pneumatic 4| in the manner previously described.

The operation of the rewind pneumatic to operating position and the release of the take-up pneumatic occur simultaneously and the record immediately starts to rewind. As soon as the record starts to rewind, the port 0 is, of course, closed, but it is necessary that the double valve 93 remain lifted until the record has been rewound. This is accomplished by reason of the fact that when suction is created in the passageway 9|, air is drawn out through the bleeder cup I94 from the chamber I9|. There being atmospheric pressure on the underside of the pouch I92 and a vacuum above-this pouch, the pouch, which is attached to the upper end of the double valve 93, holds this valve up. As long as the valve 93 remains up the rewinding operation will continue. The record sheet is provided with a hole, which in the rewinding movement of the record moves over the tracker bar opening b. This hole in the record, of course, is placed in advance of the beginning of the record. As soon as air is admitted to the opening I), it travels down the tube 101 into the chamber IOI, relieving the vacuum in this chamber, allowing the valve 93 to drop back to the position shown in Figure 4, whereupon all the parts are restored to the position shown in Figure 4.

It will be apparent that the same operation can be effected manually through the operation of the rewind and repeat manual buttons 0 and b.

The use of the double pneumatic valve 93 simplifies the rewinding and repeat circuits of pneumatic actions of this character in that the one double valve unit replaces more complicated systems of valves or valves and pneumatics. Moreover, by the arrangement shown, the double valve 93 not only controls the rewind pneumatic, but also controls the take-up or start and stop pneumatic and controls the operation of the valve 83 through which all functions of the pneumatic mechanism which are in operation during the forward movement of the record, are rendered inoperative on the rewinding movement of the record.

The winding and rewinding drive is simple in its construction and is very compact. The sprocket wheel 24 with its peripheral flange 24a and its bevel gear 24b are continuously driven so long as the motor I3 is operating. The starting and stopping of the take-up spool is effected entirely through the slight movement of the link 29 which carries the bearing 30 for the continuously driven shaft 26. The rewinding is effected through the simple vertical movement of the idler roller 48. The power for winding and rewinding is transmitted mechanically from the single motor which drives the whole mechanism, eliminating any requirement for an air motor such as is commonly used in most pneumatic actions. By turning the knurled head on the screw 35, the position of the friction roller 32 with reference to the center of the take-up spool can be changed to give a considerable range of adjustment in the speed at which the take-up spool is driven.

In the driving system the motor operates continuously during the operation of the machine. It drives the pulley IS with which is associated the typewriter carriage return reel. Pulley 15 in turn continuously drives the pulley 20 which is keyed to the pump shaft and which has associated with it the sprocket 23. The sprocket in turn continuously drives the member 24. The member 24 serves to transmit motion during the forward movement of the record to the take-up spool. This drive, besides being very compact, correlates the speed of the carriage return reel to the speed of the forward movement of the record. Consequently, when the pneumatic mechanism is driving a typewriter, the speed at which the carriage return reel is operated is properly correlated to the speed at which the record moves, and the record may therefore be punched in such fashion that when the end of a line is reached and the typewriter carriage has to be returned, adequate time will be given for the carriage to return before the character key operating mechanism gets into operation. This avoids any necessity for stopping the take-up spool after the writing of each line on the typewriter as is now frequently done.

While I have shown and described in detail one preferred embodiment of my invention, it will be understood that various changes and modifications may be made within the contemplation of the invention and under the scope of the following claims.

I claim:

1. A record roll mechanism for pneumatic actions comprising a rewind drive, a pneumatic for actuating the same, a double pneumatic valve for controlling the rewind pneumatic, said valve having opposed operating pouches by means of which it may be retained in either one of two positions, a tracker bar having record controlled openings therein and pneumatic circuits from two of said openings to the two pouches whereby record openings registering with openings in the tracker bar may control the action of the pouches.

2. A record roll mechanism for pneumatic actions comprising a record take-up drive and a pneumatic for actuating the same, a record rewind drive and pneumatic for operating the same, and a double-acting pneumatic valve for effecting the operation of the rewind pneumatic, said double-acting valve also being arranged to control the take-up drive pneumatic to render such pneumatic ineffective when the rewind pneumatic is active and to operate the take-up drive pneumatic to render the same effective upon the rewind pneumatic being rendered ineffective.

3. A record roll mechanism for pneumatic actions comprising a take-up drive and shifting mechanism therefor, a rewind drive and shifting mechanism therefor, and pneumatic means for controlling both of said shifting mechanisms, said pneumatic means including a single pneumatic valve for directly controlling the take-up drive shifting means, and a double pneumatic valve connected to control the rewind shifting mechanism, said double pneumatic valve also being arranged to pneumatically control said single pneumatic valve, the arrangement being such that the take-up shifting mechanism is rendered inoperative when the rewind shifting mechanism is operative.

4. A record roll mechanism for pneumatic actions having a tracker bar, a record roll holder and a take-up spool, said mechanism comprising a record driving shaft for transmitting motion only to the take-up spool having a friction wheel thereon for engagement with the end of the takeup roll, record controlled means for moving the shaft to bring the friction wheel into and out of engagement with the take-up spool, and means for manually adjusting the friction wheel along said shaft to vary the speed at which the take-up roll is operated, and comprising a screw with a yoke member thereon which yoke member engages the friction wheel to move it along the shaft.

5. A driving mechanism for pneumatic actions wherein there is a tracker bar, a record roll holder and take-up spool, and wherein there is also a carriage return reel and a pneumatic pump, said driving mechanism comprising a motor, a carriage return reel operating pulley driven by the motor, a pump operating pulley driven by the reel operating pulley, a record spool driving return wheel driven from the pump operating pulley, and a wind and rewind mechanism selectively driven from said wheel.

6. A drive mechanism for pneumatic actions comprising a take-up spool, a record spool and a tracker bar, a rewind mechanism including a continuously driven mechanism, a friction pulley at the end of the record spool, an idler wheel supported for vertical movement between the periphery of the continuously driven member and the friction pulley and movable vertically into and out of position where it transmits motion from the continuously driven member to said friction pulley, and means for so moving the idler.

'7. A drive mechanism for pneumatic actions comprising a take-up spool, a record spool and a tracker bar, a rewind mechanism including a continuously driven mechanism, a friction pulley at the end of the record spool, an idler wheel supported for vertical movement between the periphery of the continuously driven member and the friction pulley and movable vertically into and out of position where it transmits motion from the continuously driven member to said friction pulley, and means for so moving the idler, said means including a pneumatic.

8. A drive mechanism for pneumatic actions comprising a take-up spool, a record spool and a tracker bar, a rewind mechanism including a continuously driven mechanism, a friction pulley at the end of the record spool, an idler wheel supported for vertical movement between the periphery of the continuously driven member and the friction pulley and movable vertically into and. out of position where it transmits motion from the continuously driven member to said friction pulley, means for so moving the idler, and friction means associated with the idler and arranged to bear against the friction roller when the idler pulley is out of position to transmit motion from the continuously driven member to the friction roller for the purpose of preventing the record spool from casting.

9. A drive mechanism for pneumatic actions comprising a take-up spool, a record spool and a tracker bar, a rewind mechanism including a continuously driven mechanism, a friction pulley at the end of the record spool, an idler wheel supported for vertical movement between the periphery of the continuously driven member and the friction pulley and movable vertically into and out of position where it transmits motion from the continuously driven member to said friction pulley, means for so moving the idler, said means including a pneumatic, and a spring element associated with said pneumatic and arranged to expand the pneumatic to a position where the idler wheel is inoperative to transmit motion from the continuously driven member to the friction pulley, said spring element having a friction member thereon for cooperation with the friction pulley and-which is moved out of engagement with the friction pulley by the flexing of the spring element when the pneumatic operates to bring the idler into the operative position where it transmits motion from the continuously driven member to the friction pulley. I

10. A drive for pneumatic mechanisms wherein there is a tracker bar a take-up spool and a record roll holder comprising a continuously driven member having a peripheral surface and having a driving pinion associated therewith, a take-up spool drive having a gear engaging said pinion, means for rendering the take-up spool drive inoperative, a driving pulley on the record roll holder, and means selectively operable for transmitting motion from the periphery of the continuously driven member to said driving pulley.

11. A drive for pneumatic mechanisms wherein there is a tracker bar, a take-up spool and a record roll holder comprising a continuously driven member having a peripheral surface and having a driving pinion associated therewith, a take-up spool drive having a gear engaging said pinion, means for rendering the take-up spool drive inoperative, a driving pulley on the record roll holder, and means selectively operable for transmitting motion from the periphery of the continuously driven member to said driving pulley, the driving pulley on the record roll holder being of small diameter as compared with the diameter of the peripheral surface of the continuously driven member, whereby the rewinding is effected at comparatively high speed.

12. A drive for pneumatic mechanisms wherein there is a tracker bar, a take-up spool and a record roll holder, comprising a continuously driven ember having a pinion associated therewith, a drive shaft having a gear engaging said pinion, said drive shaft also having a friction wheel thereon for engagement with the take-up spool, and means for moving the shaft to bring the friction wheel into or out of engagement with the take-up spool.

13. A drive for pneumatic mechanisms wherein there is a tracker bar, a take-up spool and a record roll holder, comprising a continuously driven member having a pinion associated therewith, a drive shaft having a gear engaging said pinion, said drive shaft also having a friction wheel thereon for engagement with the take-up spool, and means for moving the shaft to bring the friction wheel into or out of engagement with the take-up spool, said shaft being carried in a movable bearing at one end and a fixed bearing at the other, said means for moving the shaft operating through said movable bearing.

14. A record roll mechanism for pneumatic actions, comprising a forward and rewind record driving mechanism, a pneumatic system for controlling the operation of the same, said system including a pneumatic which remains collapsed during the entire rewinding operation and which is expanded when the record is being driven forward, and a double pneumatic valve having a Valve element and two opposed diaphragm pouches for moving and holding the valve in either of two positions, the pneumatic system including separate tubes for controlling the operation of each pouch, said tubes leading through a controlled port to atmosphere and providing means for introducing air to one face of each pouch, the valve including a suction channel through which sub-atmospheric pressure may be established on the other faces of the two diaphragm pouches for directly controlling said pneumatic.

15. A record roll mechanism for pneumatic actions, comprising a shiftable rewind driving gear, a pneumatic mechanically connected with said gear for shifting said gear both into and out of driving position, and a double pneumatic valve having a valve element and two opposed diaphragm pouches for moving and holding the valve in either of two positions, the pneumatic system including separate tubes for controlling the operation of each pouch, said tubes leading through a controlled port to atmosphere and providing means for introducing air to one face of each pouch, the valve including a suction channel through which sub-atmospheric pressure may be established on the other faces of the two diaphragm pouches for pneumatically controlling said pneumatic.

GEORGE W. CARLSON.

CERTIFICATE OF CORRECTION.

Patent No 2,180,795. November 21 1959.

GEORGE W. CARLSON- I It is hereby certified that error appears in the printed specification.

of the above numbered patent requiring correction as follows: Page 6, first column, line 55 ,I claim 8, for "casting" read coasting; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 16th day of January, A. D. l9h0.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents.

A K CERTIFICATE OF CORRECTION. 7 Patent No. 2,180,795. November 21, 1959.

GEORGE W. CARLSONX it is hereby certified that error appears in the printed specification.

of the above numbered patent requiring correction as follows: Page 6, first column, line 55 ,a claim 8, for "casting" read coasting; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 16th day of January, A. D. 19M).

Henry Van Arsdale,

(Seal) Acting Commissioner of Patents.

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