US1696789A - Typewriting machine - Google Patents

Description

Dec. 25, 1928.

E. E. BARNEY TYPEWRITING MACHINE Filed Dec. 51, 1 926 2 Sheets-Sheet I l I l Q ug 6m 5 INVENTOR E, D

ATTORNEY WITNESSES Patented Dec. 25, 1928.

UNITED STATES PATENT OFFICE EDWIN E. BARNEY, OF NEV ROCHELLE, NEW YORK, ASSIGNOR TO REMINGTON TYPE- WRITER COMPANY, OF ILION, NEW YORK, A CORPORATION OF NEW YORK.

TYPEWRITING MACHINE.

Application filed December 31, 1926.

My invention relates to escapement mechanism for typewriting machines and its object generally stated is to provide new and improved escapement mechanism which. shall insure regularity in step-by-step feeding movements of the carriage under all conditions arising during the operation of the machine. More specifically my present-invention discloses an adaptation of the'main principles first embodied in the form of carriage feeding or cscapement mechanism disclosed in my prior Patent No. 1,603,109, granted Oct. 12, 1926.

To the above and other ends which will hereinafter appear my present invention consists in the features of construction, combinations of devices and arrangements of parts hereinafter described and particularly pointed out in the claims.

The preferred form of my invention is illustrated in the accompanying drawings, wherein Fig. 1 is a fragmentary front-to-rear vertical sectional View in skeletonized form il lustrating my escapement mechanism applied to a No. 12 Remington typewriting machine.

Figs. 2, 3, and 4 are operating views, certain of the escapement devices being shown in vertical section.

Figs. 5 and 5 are horizontal sectional views, Fig. 5 being taken on a plane indicated by the section line 1-1 in Fig. 2 and looking downward in the direction of the arrow at said line, and Fig. 5 a corresponding view showing the normal relationship of the parts.

Figs. 6 and 6 are horizontal sectional views, Fig. 6 being taken on a plane indicated by the section line 22 of 3 and looking downward in the direction of the arrow at said line, and Fig. 6 a corresponding view showing the normal relationship of the parts.

Fig. 7 is a rear elevation partly in section on an enlarged scale showing the escapement mechanism proper; and

Fig. 8 is a vertical sectional view taken on planes indicated by the section line 3-3 in Fig 7.

H retofore carriages controlled byescapement mechanisms have been frequently subject to irregularity in feeding or spacing, due primarily to rapid or irregular operation of the keys. Frequently an impulse Serial No. 158,286.

from the space bar is transmitted to the escapement mechanism before the completion oi a prioroperation thereof under actuation of a printing key, as a consequence of which the next following imprint takes place im mediately adjacent to the preceding imprint and without leaving a space between the two imprints asv was intended. Such eseapement mechanisms are usually set or adjusted so as to release the carriage as soon as possible after the printing of a character, the result being that there is a narrow zone or field in which the type bar moves away from the platen prior to the escapement movement of the carriage. Sometimes, while the type bar is still in this zone the space bar is actuated, resulting in a defective operation, such as above referred to. My present in vention is designed to cure such defective operations and in carrying it out I provide as in my prior patented construction above re ferred to, a duplex escapement comprising two complete escapement mechanisms, one operative by the printing keys only and the other by the space-key or bar alone. The first of these escapement mechanisms comprises two escapement wheels coaxially mounted and relatively movable to an extent somewhat less than a letter space distant, said wheels being operatively combined with a single dog. Said dog is of an unusual construction, being in the form of a toothed wheel provided. with ten teeth, said wheel being rigidly connected to another or second toothed wheel-which is one of the elements of the other escapement mechanism. The two toothed wheels are mounted on a vibratory support or dog rocker which is operative from the curved universal bar of the Remington machine, said universal bar receiving its impulses from the type bars un der actuation of the printin keys. Cooperative with the second of thetoothed wheels is an escapement dog mechanism of ordinary mechanism will. remain substantially unaffected during vibrations or actuations of the first rocker under impulses of the printing keys. The construction is such that both escapement mechanisms will operate to af ford a letter space movement of the carriage no matter how they may be actuated. For example, if the second escapement is operated before the completion of an operation of the first cscapement the result will be the same as though the two escapement mechanisms were duly operated one after the other.

Referring now specifically to the present embodiment of my invention, the Remington typewriting machine to which said invention is shown as applied has a main frame comprising a base portion 1 and a top plate 2, as shown fragmentarily in Fig. 1. Mounted above the top plate is a. powerdriven platen carriage comprising a rectangular truck 3, said carriage supporting a platen 4 (diagrammatically shown) and supported through anti-friction rollers 5 on front and rear guide rails fixed to the top plate, only the rear guide rail 6 being shown. Type bars 7 cooperate with the front face of the platen, said type bars being pivoted at 8 on a segment 9 and normally resting at their free ends againsta type rest- 10. The heel portion of each type bar is formed with a slot 11 which is engaged by an actuating pin 12 that projects laterally from the upper end portion of a sub-lever 13, the set of sub-levers being pivoted at let on a stationary support 15. The short arm of each sub-lever is formed with a slot 16 which is, engaged by a late "al pin 17 projecting from an upward extension or arm of a key lever 18. The set of key levers are pivoted at their rear ends on a fulcrum plate 19 and at their front ends are provided with key caps 20. Then any key 20 is depressed it operates through the described train of connections to actuate the connected type bar, swinging it upward and rearward on its pivot into printing contact with the front face of the platen 4.

Each type bar has a contact face 21 which, as the companion type head nears the platen, strikes against the front of a curved universal bar 22 received in a depression 23 that is formed in the rear face of the type bar segment 9. The universal bar proper 22 is part of a frame which further comprises rearwa-rdly extending arms 24. A lug 25 on said frame carries a guide pin 26 which slidably engages in a hole 2'7 in the segment 9, thus assisting to support and guide the front portion of said frame. The rear portion of said frame is supported on a rocking frame comprising a rock shaft 28 which is pivoted on a bracket 29 carried by the segment 9. Rising from the shaft 28 are three upright arms, the two end arms being pivot ally connected to and supporting the arms 24;

' holder l by the slotted forward end portion of a link or connector 32, said link extending rearward to transmit movement between the universal bar frame and the escapenient devices hereinafter described.

A space bar or key 33 of ordinary construction is arranged at the front side of the keyboard composed of the banks of printingkeys 20. Said space bar is supported on the front ends of arms 34 which project forward from a rock shaft 35 mounted in the base 1; Secured to said rock shaft at about its middle and projecting upward and rearward therefrom is an arm 36 which carries an arm or extension 37. Said arm 37 is adjustably supported on the arm 36, being pivoted at 38 to said arm 36 and the two arms being held in adjusted relationships by a clamping screw 39 which passes through a slot 40 in the arm 37. Said arm 37 has a slot ll that is engaged by an eccentric screw 4-2 carried by the arm 36. When the screw 39 is loosened the screw 12 may be turned to readjust the arm 37 so as to change the normal position of a lateral pin 43 which is carried at the upper end of the arm 37 as an engaging device or motion transmitter, as hereinafter explained. Connected to the arm 37 is the upper end of a coiled draw spring 4A. the lower end of said spring being hooked or anchored to a projection 45 that is in the form of an angular strip secured as by a rivet 4:6 to a transversely extending piece of sheet metal that is folded into a Cshape and provides a clamp or holder l7 for a felt damper 4L8 (Fig. 1). The felt strip composing: the damper is folded lengthwise so as to fit inside the holder 47 and has projecting; end portions 49 that are turned at right angles upward and downward to provide a contact surface for the restoring spring-s o0 of the key levers 18. The lower ends of the springs 50 are connected to their respective key levers and the upper end portions are connected to adjusting screws 51 rotatively supported in and projecting downward through a hood 52 extending transversely of the key levers and secured to the sides of the base 1. The til-shaped holder 4-? is sup ported from the hood 52 by a pair of spring; clips 53 that are hooked over the hood near its ends, said clips, terminating: at their front one s in ii-shaped portions which embrace and clamp the end portions of the 7. The upper end portion of the snip l5 abuts the under side f the hood 52, said strip thus being held against displacement. When the key levers are actuated the springs 50 tend to vibrate some what, this vibration resulting in a humming, or, as it is termed, chiming sound. The felt contact faces 49 bear lightly against the fronts of the springs so. as not to interfere with their operation, but at the same time serve as a damper to reduce their vibration and eliminate the sound due thereto.

Carried by a frame 55 pivotedat 56 on the travelling platen carriage is a feed rack 57 that is normally maintained in springpressed engagement with a feed pinion 58 which is integral with a horizontal rearwardly extending sleeve 59, as best shown in Fig. 8. Passing through said sleeve is a shaft 60 provided with enlarged bearing faces 61. The extreme end portions of the shaft are reduced as indicated at 62 and 68 and bear in the front and rear end portions or ears 6 1 and 65 of a bracket that comprises a yoke portion 66 horizontally disposed and terminating in the said bearing portions 64 and 65. The rear end portion 68 of said shaft bears directly in a bushing 63 whichis adjustably clamped in the ear 65. Integral with the yoke portion 66 is a foot piece 67 that receives screws 68 whereby the bracket 64.67 is detachably secured to a lower bracket designated as a whole by the numeral 69. Said bracket 69 preferably formed of a single piece of sheet metal is disposed in a cut-out 70 in the rear portion of the top plate 2, the bracket 69 being detachably fixed to said top plate by screws 71. The two brackets support the duplex escapement devices comprised in both of the escapeinent mechanisms and may be detached. together with said escapement devices by removing the screws 71.

Referring rst to the escapement mechanism that is operative by the printing keys, said. mechanism comprises two escapement wheels 72 and 73 having a common axis of rotation. The wheel 72 is formed with 'ad-ial teeth 74 beveled at the rear to provide contact or working faces 75. Said wheel further comprises a hub portion 76 and bosses 77 and 78, as best shown in Fig. 8. The hub 76 receives screws 79 that are threaded therethrough and abut against flattened faces on the shaft 60, thus securing the wheel 7 2 fixedly to said shaft. The wheel 73 formed with a circular cut-out 80 to fit over the boss 78 and bear rotatively on the periphery thereof. Said wheel is of substantially the same diameter as the wheel 72 and is likewise provided with radial teeth 81 corresponding in number to the teeth aand having bevels 82 at their front sides. The wheel 73 is movably related to the wheel 72, being provided with arcuate slots 83 preferably three in number, best shown in F g. 7. These slots receive headed screws 84- whieh are threaded into the wheel 72. A wire spring 85 is wound around the boss 77 for nearly its whole periphery. said on the rocker.-

spring being confined between the two wheels and having one of its ends connected to one wheel and the other to the other wheel. Viewed from the rear the spring 85 tends constantly to turn the wheel 73 in clockwise direction. The relative movement thus provided for between the two escapement wheels is sufficient to afford substantially aletter space feeding movement of the carriage. Pivoted on the front of the escapement wheel 72 is a spring-pressed pawl 86 which cooperates with ratchet teeth 87 formed interiorly of a box or drum 88 integral with the sleeve 59. The pawl- andratchet connection 86, 87 thus provided between the pinion 58 and the escapement wheels 7 2 and 73 permits return movements of the carriage independently of said escapementwheels.

The dog device that cooperates with the escapement wheels 72 and 78 to afford escapement movements under the control of the printing keys is mounted on a vibratory carrier or rocker designated as a whole by the numeral 89. Said rocker is preferably made of sheet metal and has rearwardly turned ears 90 which are formed with bearing depressions that receive the inner coned ends of pivot .screws 91 that are adjustably secured in ears 92 and 93 bent off rearward from the sides of the bracket 69. The rocker 89, 90 carries at its upper end portion above its pivotal axis a headed shoulder screw 94 that is threaded through therocker 89 and is secured thereto by a nut 95 abutting against the front face of said rocker. A washer 96 is interposed between the shouldered portion of the screw and the rear face of the rocker and when the nut 95 is tightened cooperates to clamp the screw 94 in place. The shouldered portion 941 of said screw 94 provides a bearing surface for a double hub member as will be clearly understood from Fig. 8. Said hub member comprises hub portions 97 divided by a centrally disposed flange 98. Mounted on the hub at opposite sides of the flange are wheels 99 and 100 formed with radial teeth 101 and 102, there being preferably ten teeth on each wheel. The wheels and their hub 97 98 are secured in fixed re lationship by pins or stakes 108. As will hereinafter clearly appear, the teeth 101 of the rear wheel are adapted each to function as an escapement dog or pawl in coo aeration with the escapement wheels 79 and 8. The rocker 89 has secured to its left-hand side (viewed from the rear) an arm 104, the upper end of said arm being pivoted on a screw 105 which is threaded into an ear 106 Between its ends ti e arm 10% receives an adjusting screw 107 which cooperates with a nut 108 to vary the ivotal position of said arm 104 when its pivot screw 105 is loosened. The purposeof this construction is to vary the normal position of a laterally projecting pin 109 carried at the lower end of the arm 10a. Said pin is formed with a groove 110 which receives the forked rear end of the connector or link 32. Real-ward movement transmittedto the link from the universal bar 22 is in turn transmitted through the pin 109 and arm 101 to initiate a vibratory movement of the rocker 89 and the parts mounted thereon about the pivotal axis passing through the pivots 91. The rocker 89 is provided with a restoring spring 111, the rear end of which is hooked through a hole in said rocker below its pivotal axis, the forward end of spring being anchored to the perforated head of a rod or pin 112, said rod being secured for fore and aft adjustment by a screw pin 113 to the ear 92 ot' the bracket 69. The screw pin is clamped into place by a nut 11% that abuts'against the outer face of the ear 92. The rod 112 and the spring 111 pass througl'i a suitable hole in the wall of the bracket 69. The spring 111 tends constantly to maintain a. stop pin 115 carried by and projecting forward through the rocker 89 below its axis in contact with the bracket 69 as shown in Fig. 1. By this arrangement one of the teeth 101 may be brought substantially into the plane of rotation of the wheel 73, the lower tooth 81 of said wheel being engaged by the upper tooth 101 of the wheel 99. A stop pin 116, carried by the rocker 89 above its pivotal axis, limits the forward vibratory swing of the rocker under impulses of the printing keys. At such times the wheel 99 pre rented from rotating on its own axis by cooperation of the wheel. 100 with devices hereinafter described, and as a consequence the uppermost wheel tooth 101 will swing into and out of cooperation with the escapement wheels 72 and 73 at each vibration of the dog rocker 89, thus attording letter space feeding movements of the carriage. In this connection it will be understood that the normal relationship of the parts is as shown in Figs. 1 and 7 with the wheel tooth 101 acting as adog and in engagement with the lowermost tooth 81 ot' the rear escapementwheel 73 when one of the printing keys is actuated, causingthe connected type bar to print, said type bar as it swings upward and rearward will act through its contact'tace T1 to actuate the universal bar 22 and cause the connector 32 to move rearwa d, swingliw the rocker 89 on its pivotal center and cansing the engaged tooth 101 of the wheel dog 99 to swing forward out of engagement with the tooth 81 and into engageme t with the lowermost tooth 7 1 of the front escapement wheel 72 illustrated in Fig. 2. As soon as the tooth 81 is released by the wheel the spring 85 will rotate the wheel 73 relatively to the wheel 72 until said wheel '13 is arrested by the engagement of the ends of the slots 83 with the shanks ot the screws 8 1.

There is a slight drop between the teeth of the wheels 73 and 72 so that the carriage receives an initial movementon the down stroke of a printing key. However, the actual letter space movement of the carriage does not occur until the return movement of the dog rocker 89 takes place. Such carriage movement starts as soon as the wheel dog starts to swing rearward, due to the beveled contact face 7 5. As soon as the tooth 101 of the wheel dog clears said contact face the wheel 73 will turn to an extent permitted by the length of the slots 83, such movement, of course, being opposition to the spring 85 which will thereby be contracted, the result being that the relationship of the two wheels is restored to the normal position shown in 7. As a result of this operation of the escapement mechanism the power driven carriage, which is connected therewith through the rack and pinion connection 57, 58, will be afforded a letter space movement towards the left under the impulse of the usual main spring or carriage motor mechanism which is conventionally illustrated in Fig. 1, the main spring drum being designated as 3 and the band or strap that connects it to the carriageas 3 ment devices are so related that the substantially complete escapelnent movement takes place during the initial stage of the return movement of the printing type bar away from the platen.

Referring now to the second escapement mechanism comprised in the duplex escapen'ient devices and which is actuated from tl e space bar of the machine, said mechanism comprises the wheel 100 which serves as an .escapement wheel proper in cooperation with a pair of escapement dogs hereinafter described. The escapement mechanism thus constituted is connected with the carriage through the wheel 99 and the wheel 73 which serve in etlect as gear wheels during escapement operations under actuation of said space bar. The dog devices with which the escapement wheel 100 cooperates are mounted on a dog carrier or rocker, designated as a whole by the numeral 117, and provid d with a cross portion 118 which is depressed at its ends to receive screw pivots 119 that are adjustably secured in ears 120 projecting from the lower portion of the bracket 69. The rocker 117118 carries a holding dog 121 and a. stepping dog 122 of ordinary construct-ion. The dog 121 is in the form of a plate having an engaging tooth and is adjustably secured by screws 123 to the rocker 117 at its rear face and above its pivotal axis, The dog 122 is in the form of a pawl having a hub portion 12 1 which receives a bearing pin 125 pivotally supporting the pawl at the front face 01? the rocker 117. The dog or pawl 122, 12 1 has a tail portion 126 which is connected The escapeto a dog spring 127 anchored to a screw stop pin 128 on the rocker, said spring tending constantly to throw the upper end of the dog 122 leftward when viewed from the rear. Normally the dog 121 is engaged with the lowermost tooth of the Wheel 100, the rocker being held in normal position to maintain this engagement by reason of the contact of the stop pin 128 with the face of the bracket 69 through the action of a rocker spring 129. Said spring, as best known in Fig. 8, is coiled around a pin 130 on the bracket 69, its rear end portion being coiled around a screw pin 131 on the lower end portion of the rocker 117.

The rocker 117 is actuated or vibrated from the space bar 33 through impulses communicated from the actuating pin 43 (Fig. 1) to an actuator 132 that is pivoted at 133 to an ear 134 turned rearward from the lower end portion of the bracket 69. The downwardly extending arm of said actuator 132 is slotted as indicated at 135 to fit over and engage with the actuating pin 43. The actuator 132 has an upward extension 136 at the front of the bracket 69 terminating in a rearwardly bent nose or contact portion 136 which passes through an opening in the bracket and is adapted to contact with the front face of rocker 117 above its pivotal axis.

It will be understood that when the parts are in normal position the dog 121 will be engaged with the wheel 100 at its under side while the dog 122 will lie forward of the plane of said wheel. When the space bar 33 is actuated it rocks the shaft 35 and swings the pin 43 upward and forward about said shaft, the motion of said pin being transmitted through the nose 136 to the rocker 117. The rocker 117 is thereby swung rearward from the normal position shown in Figs. 1 and 8, causing the dog 121 to disengage from the lowermost tooth 102 of the wheel 100 and bringing the-stepping dog 122 into the plane of said wheel. As soon as said wheel is released by the dog 121 it will start to turn in counter-clockwise direction (as viewed in Fig. 7) so that the oncoming wheel tooth 102 will engage with the dog 122, turning said dog on its pivot and extending its spring 127 until said dog is arrested by its stop 137. The parts will now be related as shown in Fig. 6. This operation which takes place during the depression of the space bar permits the wheel 100 to turn one tooth. The connected wheel 99 simultaneously turns, of course, to a corresponding extent, this motion being in turn transmitted or afforded to the connected wheel 73 and thence through the rack and pinion 57, 58 to the power-driven carriage which will be drawn a letter space distance leftward under the pull of the carriage motor 3*.- On releasing the space key the parts will be restored to normal position by the restoring springs, It will be understood that at each depression of the space key the operation above outlined will be repeated, the second escapement mechanism operating as a reverse feed escapement and the elements 73 and 99 of the other escapement mechanism acting as transmitting devices or gear wheels between the carriage and said second escapement mechanism. It will be also apparent that the first described escapement mechanism operates as an ordinary feed escapement, the escape- 100 on the rocker 89 being so slight becauseof the arrangement of the parts that contact will not be lost between the tooth 102 and the dog 121 at any time. The onlytime this relationship is disturbed is when the space bar is actuated, which releases both wheels 99 and 100. Thus the wheel dog 99 acts on the escapement wheel 73 to afford escapement movements in two ways, i, e., by a bodily movement and also by a rotary movement.

Preferably there is provided a combined stop and actuating member which cooperates with certain of the escapement devices and also with an escapement-wheel dog or wiper detent mechanism substantially corresponding with the mechanism disclosed in the patent to Seib No. 1,342,466 dated June 8, 1920. In Figs. 1, 7 and 8 there is fragmentarily illustrated a dog stop or wiper det'ent 138 coresponding to the member 25, 36 disclosed in the aforesaid Seib patent. Cooperative with the stop member 138 there is preferably provided in the present ill. stance a member designated as a whole by the numeral 139, said member being made of a single piece of sheet metal and bent to the desired shape as illustrated in Figs 1, 7 and 8. Said member comprising a cross portion 140 having rearwardly bent ears 141 which are perforated to fit over and bear rotatively on the pivots 91 between the ears 92 and 93 of the bracket 69. An arm 142 projects upward from the right-hand end portion, viewed from the rear, of the cross part 140 and is offset rearward so that its upper end portion is adapted for. coperation with the member 138. The arm 142 is in register with the stop pin 116 which is adapted to cooperate with it, said stop pin normally contacting with said arm which acts as an abutment to determine the normal position of the dog rocker 89. Extending downward from the cross portion 1 10 at the right is an arm or extension 1 13 which carries a stop pin 1 14c adapted for cooperation with the dog rocker 11'? and to arrest said dog rocker when it is actuated so to determine the limit of its movement. When the carriage is returned, as is well understood, the stop 138, which is spring pressed and which normally lies out of the plane of the wheel 72, will be thrown into the plane of said wheel and will interlock with the teeth thereof, this action being due to the release of the stop 138 by the carriage rack by which said stop member is normally controlled. After the carriage has been fully restored to the right, an actuation of a printing key will automatically throw the stop 138 out of its locking position, due to the action of the pin 116 on the arm 1 12 which in turn will swing the stop 138 out of use. Likewise an operation of the space bar at the beginning of a line instead of a printing key will actuate the dog rocker 11? which through the pin 144; will correspondingly swing the memher 139 on its pivots, causing the extension 142 to throw out the member 138.

It will be understood that during the normal operation of the machine the two escapement mechanisms operate independently of each other. During actuations of the printing keys the first or ordinary escapement mechanism will be operated to afiord letter space movements of the carriage after the type bars have printed and shortly after their return movements away from the platen have started. During these operations the second escapement will remain substantially unaffected. This will be clear from a consideration of Figs. 1, 2, 5 and 5 In Figs. 1 and 2, showing the normal relationship of parts, the dog or tooth 101 engages with one of the teeth 81, whereas in Figs. 2 and 5 the dog tooth 101 is shown in its abnormal position engaged with the beveled or working face of the tooth 7 1, this tooth 101 being prevented from rotating about the axis of its wheel by the engagement of a tooth 102 with the dog 121. During the return movement the dog 101 will still be prevented from turning and when it has engaged with a tooth 81 and has cleared the tooth 74; the full escapement movement will take place.

On the other hand, when the space key is actuated an escapement movement of the carriage will be afforded during the depression of said key by reason of the second or reverse feed escapement. The normal relationship of the parts is as shown in Figs. 1 and 6 while their relationship when the space key is fully depressed is shown in Figs.

3 and 6 Normally it will be noted the tooth or dog 121' is engaged with a wheel tooth 102 while the dog 122 stands forward of said tooth. As a result, however, of depressing the space key the dog 121 is carried out of engagement with the tooth 102 and the dog 1.22 is brought into position to be engaged by the oncoming tooth 102 afford-- ing a feeding movement of the carriage.

The construction is such that the two escapement mechanisms however they may be operated will always each afford a stepping movement of the carriage. This is true no matter how irregular the operations may be. For example, in Fig. 4 is illustra'tcd the relationship of the parts of both escapement mechanisms when both a printing key and aspace key are in depressed positions. The parts are positioned to afford an escapement movement following the movement which the carriage will receive when the upper rocker, that of the first escapement mechanism, has retracted far enough for the dog tooth 101 to clear the engaged tooth 74: and enter the plane of the tooth 81. As soon as this takes place the feeding movement due to the printing key actuation will take place as though the space bar were not depressed. Also the movement due to the actuation of the space bar will occur. No matter in what order the printing key and space bar may be actuated and released there will result a feeding movement for the last printed letter and also a feeding movement for the space following it.

Various changes may be made without departing from my invention.

What I claim as new and desire to secure by Letters Patent, is

1. Escapement devices for the power driven carriage of a typewriting machine comprising two complete escapement mechanisms, one of said mechanisms comprising two escapement wheels and a single cooperating dog and the other comprising a single escapement wheel and a pair of cooperating dogs, said single dog and said single wheel having a common movable support.

2. Escapement devices for the power driven carriage of a typewriting machine comprising two complete escapement mechanisms adapted for separate operations, one of said mechanisms comprising two escapement wheels and a single cooperating dog and the other of said mechanisms comprising a single escapement wheel and a pair of cooperating dogs, said single dog and said single wheel having a common movable support, the first of said mechanisms affording a feeding movement of the carriage dur ing the return of the parts to normal position and the second of said mechanisms aifording a feeding movement of the carriage during the depression of a key.

3. Escapement devices for the power driven carriage of a typewriting machine comprising two complete escapement mechanisms, one of said mechanisms comprising two escapement wheels and a single coopcrating dog and the other of said mechanisms comprising a single escapement wheel and a pair of cooperating dogs, saio single dog and said single wheel having a common movable support, the first of said mechanisms being operative by the printing keys, the second mechanism being operative only by the space bar of the machine.

'4. Escapenient devices for the power driven carriage of a typewriting machine comprising two separately operative escapement mechanisms, one of said mechanisms comprising a wheel dog and escapement wheels with which said dog cooperates, said dog being held against rotation by the other escapement mechanism.

5. Duplex escapement mechanism for typewriting machines comprising two pairs of toothed wheels, the wheels comprised in each pair having a common of rotation, the two axes of rotation being horizontally disposed and parallel with each other, and means for affording bodily movement of one pair of wheels so as to cause one member of said pair to cooperate with the other pair of wheels to afford escapement movements of the carriage.

6. Duplex escapement mechanism for a typewriting machine comprising two pairs of toothed wheels,-one of said pairs only being rotatable during the operation of the printing keys, and means for bodily moving the other pair to cause one of its wheels to cooperate with the rotatable pair to afford escapement movements of the carriage when the printing keys are actuated, all of the wheels being rotatable when the space bar of the machine is actuated.

7. Escapement devices for the powerdriven carria e of a typewriting machine comprising two escapement mechanisms which include two key operated dog rockers, a pair of toothed wheels rotatably mounted on one of said dog rockers, escapement wheels with which one of said pair of toothed wheels cooperates when said rocker is actuated, and two dogs, one a stepping dog and the other a holding dog, mounted on the other of said dog rockers and cooperative with one of said toothed Wheels when said rocker is actuated.

8. Escapement devices for the powerdriven carriage of a typewriting machine comprising two escapement mechanisms which include two dog rockers, a pair of toothed wheels rotatably mounted on one of said dog rockers and two dogs, a stepping dog and a holding dog, mounted on the other of said dog rockers, said dogs being adapted when their rocker is vibrated to codriven carriage of a typewriting machine comprising two escapement. mechanisms w 11 include two dog rockers or carriers,

a pair of toothed wheels rotatably mounted on one said dog rockers and two dogs, a stepping dog and a holding dog, both mounted on the other of said dog rockers, said last named rocker being actuated by the space bar only of the machine, whereby said dogs are caused to coa ct with one of said toothed wheels to afford letter space move ments of the carriage.

l0. Escapement devices for the powerdriven carriage of a typewriting machine comprising two escapement mechanisms which include two dog rockers or carriers, a pair of toothed wheels rotatably mounted on one of said dog rockers and two dogs, a stepping dog and a holding dog both mounted on the other of said dog rockers, said last named rocker being actuated by the'space bar only of the machine, whereby said dogs are caused to coact with one of said toothed wheels to afford letter space movements of the carriage, the other of said wheels at such time ailording an operative connection between the first toothed wheel and said power-driven carriage.

11. In a typewriting machine, the combination with a power driven carriage, of escapement devices including a wheel dog, and keys operative on said dog, certain only of said keys causing a bodily movement of said dog to afford letter feed movements of said carriage, certain other of said keys affording only rotary movements of said dog during letter spacing operations.

12. In a typewriting machine, the combination of a traveling carriage, a feed rack thereon, a cooperating feed pinion, a pair of toothed escapement wheels connected to said. pinion, said wheels being adapted for relative movement with respect to each other, a second pair of toothed wheels, a rocker on which said second pair of wheels llf:

are mounted, said rocker being operative by the printing keys, one of said second pair of wheels coacting with said first named pair of wheels to afford letter space movements of the carriage, a second rocker operatively connected with the space bar of the machine, and a pair of dogs on said second rocker, said dogs enacting with one of said second pair of wheels to afford letter space movements of the carriage when the space bar is actuated.

13. In a typewriting machine, the combination of a carriage; duplex escapement cleliil's vices including a plurality of escapement Wheels and tWo key actuated rockers; means for locking certain of said Wheels against rotation during return movements of the carriage; and a pivoted device operative by both of said rockers to release said locking means and free the escapement Wheels for letter feed movements.

14. In a typewriting machine, the combination of a carriage; duplex escapement devices including a plurality of escapement Wheels and two key actuated rockers; means for locking certain of said Wheels against rotation during return movements of the carriage; anda pivoted device operative by both of said rockers to release said locking means, said pivoted device also serving as a stop for both of said dog rockers.

an intermittent stepby-step feed movementof the carriage.

Signed at the borough of Manhattan, city of New York, in the county of New York and State of New York this 30th dayof December, A. D. 1926.

EDWIN E. BARNEY.

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