US1560031A - Typewriting machine - Google Patents

Description

Nov. 3,1925- E. E. BARNEY TYPEWRITING MACHINE Filed Feb- 4, 1924 3 Sheets-Sheet ATTORNEY E. E. BARN EY TYPEWRITING- MACHINE Filed Feb v Nov. 3, 1925.

4, 1924 3 Sheets-Sheet 2 WITNESSES Nov. 3, 1925.

E. E. BARNEY TYPEWRITING mcamz 3 Sheets-Shut 3 Filed eb. 4, 1924 \INVENTOR ATToNEY WITNESSES Z W- Patented Nov. 3, i 1925.

UNITED STATES PATENT OFFICE.

EDWIN E. BARNEY, OF NEw ROCHELLE, NEw YORK, AssreNon 'I'O nEmr'Ne'roN TYIPE- WRITER COMPANY, OF 'IIIION, NEW YORK,

CORPORATION OF NEW-.YORK.

'IYPEWRITING MACHINE."

Application filed lebrixary 4, 1924. Serial No. 890,382.

To all whom it may concern:

Be it known that I, EDWIN E. BARNEY, citizen of the United States, and resident of New Rochelle,'in the county of Westch'ester and State of New York, have invented certain new and useful Improvements in Typewriting Machines, of which the following is a specification.

My invention relates to escapement mechanism for typewriting machines, and in general its object is to provide a novel kind of escapement mechanism which shall promote and insure regularity in step-by-step feeding movements of the carriage under all conditions arising during the operation of the machine. More specifically, my invention discloses another adaptation of the main principles first embodied in the form of es capement mechanism disclosed in my PIIOI application, Sr. No. 684,548 filed January 5, 1924. I

To the above and other ends WhlCh'Wlll hereinafter appear, my invention consists tions of devices and'arrangements of parts hereinafter described and particularly pointed out in the claims.

The preferred form of my invention 1s illustrated in the accompanying drawings, wherein- Figure 1 is a fragmentary front to rear vertical sectional View, largely skeletonized, illustrating my novel escapement mechanism applied to a" Remington typewriting machine.

Figure 2 is a. view corresponding to Figure 1 but omitting some of the parts 'disclosed therein and showing other parts in different relationships.

Figures 3 to 6 are diagrammatic views illustrating different stages of the escapement operation.

Figure 7 is a horizontal sectional view taken axially of the shaft supporting the escapement wheels, this view showing the normal position of the parts as in Figure 1 but with the rotating annular dog rocker turned a quarter turn from the Figure 1 position.

Figure 8 is an enlarged fragmentary View in the features of construction, combina taken axially of the escapement wheels and showing the bracket on which their shaft and other escapement parts are mounted,- this view showing the rotating dog rocker in operated position. i

Figure 9 is a vertical sectional View taken on a plane represented by the section line .1-1 in Figure 8 and looking in the direc tion of the arrow at said line.

Figure 10 isa face view or rear elevation of the annular dog carrier or rocker and its mounting.

Carriages controlled by escapement mechanism as heretofore constructed have been subject to irregularity in feeding or spacing, due primarily to rapid or uneven operation of the keys. Frequently an impulse from the space key or bar is transmitted to the escapement mechanism before the completion of the operation thereof under actuation of a printing key. The result is that the next following imprint takes place adj acent to the preceding imprint and without leaving a space between them as was intend ed. The escapement mechanism is usually 7 set so as to release the carriage as soon as possible after the printing of a letter, the result being that there is a narrow zone or field in which the type bar moves away from the platen prior to the release of the carriage. It frequently happens that while the type bar is still in this zone, the space bar is actuated, resulting in the defective opera-- tion referred to above. My invention is designed to obviate such defective operations, 85 and in carrying it out in the present instance I provide as in my prior construction disclosed in the aforesaid application, Sr. No. 685,548, two complete escapement mechanisms comprising each a dog rocker, a plurality of dogs, and a co-operating escapement wheel. In the present instance, however, the two escapement wheels are rigidly connected together, one wheel having radial teeth of ordinary construction and the other crown teeth arranged at the front face of the first wheel. A dog rocker and dogs of ordinary construction co-operate with the radially toothed wheel under actuation of the printing keys." The other dog rocker ma a type rest 10. The rear end portlon of however is of novel construction, being in the form of an annulus or ring rovided with diametrically disposed dogs w ich' cooperate with the crown toothed wheel. The annular dog rocker is mounted to vibrate or rock on its axis or axle, which in turn is mounted for rotation co-axially with the escapement wheels, so that the annular dog rocker is subjected to two movements, onea vibratory movement and the other a movement of bodily rotation. The annular dog rocker is controlled by a train of devices actuated by the space bar or key and distinct from the operating trains by whlch the other escapement mechanism is controlled. 7

Referring specifically to the present embodiment of my invention, the Remington typewriting machine to which it is shown as applied has a main frame comprisinga base portion 1 and a top plate 2 as fragmentarily illustrated in Figure 1. Mounted above the top plate is a traveling platen carriage comprising a truck 3 havin front and rear bars and connecting end bars. The carriage supports a platen 4 diagrammatically shown herein and is connected through antifriction rollers 5 with front and rear guide rails fixed above the top plate, the rear guide rail 6 only being shown. Co-operative with the front face of the platen are type bars 7 pivoted at 8 on pc bar support or segment 9 and norfiy' resting near their free ends against each type bar is rovided with a slot'll cooperative with w ich is an actuating pin 12 projecting laterally from a sub-lever or bell crank 13, the set of sub-levers being pivoted at 14 on a stationary support 15. Theshort arm of each sub-lever is formed with a slot 16 which co-operates with a lateral pin 17 T on a projection from a key lever 18. The set of key levers 18 are pivoted at their rear ends on a fulcrum 19 and at their front ends are provided with key caps 20. When any key 20 is depressed it operates through the described train of connections to actuate the associate 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 it nears the platen, strikes against the front of a curved universal bar 22 seated in a depression 23 that is formed in the rear face of the type bar segment 9. The.

universal bar 22' is part of a frame which further comprises rearwardly extending arms 24 and a lug 25v carrying a guide pin 26 which slidabl engages in a hole 27 in the segment 9 an thus assists to support the front portion of the universal-bar frame. The rear rtion 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 arms, the two end arms being pivotally connected to and supporting the The usual space key or bar 33 is arranged at the front slde of the keyboard, comprising the banks of printin keys 20, and is supported on the front ends of spacing lever arms 34 which project forward from a rock shaft 35. Secured at about the middle of said rock shaft and projecting upward and rearward therefrom 1s an arm 36 which carries an extension or arm 37. Said arm 37 is adjustably supported on the arm 36, its lower end being pivoted at 38 to said arm 36, the two. arms being held in adjusted relationship by a clamping screw 39, said screw passing throu h a cross slot 40 in the arm 37. Said arm is also formed with an elongated hole or slot 41 engaged by an eccentric screw 42 carried by the arm 36. By loosening the screw 39 and turning the screw 42, the arm 37 may be re-adjusted to vary its position and change the normal location of its upper forward face 37 which serves as a contact. The shape of the arm 37 is somewhat different from the regular construction although it is adjustably connected in the usual way with the arm 36. Connected to the arm 37 is a restoring spring 43 having a stationary anchorage.

Carried by a frame 44 pivoted at points portion of the shaft projects-beyond the rear.

end of the sleeve and terminates in a reduced end portion 53. The ortions 52 and 53 provide bearings for the bracket designated as a whole by the numeral 54. he bracket comprises a yokelike upper portion 55 and an underlying base portion 56. Screws 57 secure the bracket 54 to the upper part of a second or main bracket designated as a whole by the reference numeral 58, the bracket 58 dependthe sleeve is a shaft shaft on a ing from the under side ofthe top plate 2 at its rear and bein secured to said top plate by screws 59. 330th brackets 54 and 58 are preferably of the usual Remington construction. A cut-out 60 in the top plate 2 affords room for the bracket 54 and the parts supported on the shaft 49. The bearmg portion 52 of said shaft bears in the front end portion of the yoke 55 while the mar bearing portion 53 is supported by a hollow bearing pin or bushing 61 which is of ordinary construction, said wheel having radial teeth 66 and being provided with a collar portion 67 which receives set screws 68 whereby the wheel 65, 66 is fixedly secured to the shaft 49. The escapement wheel- 65, 66 and the feed pinion 47 have a one-way connection, that is they are forced to turn together during step-by-stepletter feeding movements of the carriage but are disconnected during return movements of the carriage when the pinion 47 may turn while the wheel does not. This one-way connection, so-called, comprises novel' devices hereinafter described; At this point, it is only necessary to say that the normal pull or impulse of the carriage towards the left is transmitted through the feed rack 46, feed pinion 47, and the novel one-way connection to the escapement wheel 65, 66. This impulse of the carriage is derived from the usual motor mechanism or spring drum 69 which is connected to the carriage by a band or strap 70 (Fig. 1) and constantly tends to impel or draw the carriage leftward on its bearings above the top plate. Arranged below the escapement wheel 65, 66 is a dog carrier provided with a pair of dogs adapted to co-operate with said escapement wheel. The dog carrier and the dogs are preferably of ordinary Remington construction and are actuated by the type bar operated universal bar 22 in the usual manner, although it is to be understood that these features may be varied without materially departing from my invention. The dog carrier or rocker shown in Figs. 1, 2 and 8 is designated as a whole by the numeral 71 and comprises an upright portion or arm 72' and a cross portion 73. The ends of portion 73 are formed with depressions to receive coned bearing elements 74 and 75 which are adjustably fixed in parallel ears 76 integral with the bracket 58 and projecting rearward from the body portion 77 thereof. Pivoted at 78 to the front of the rocker arm 72 is a loose or stepping dog 79 which extends upward and terminates in a tooth 80 normally engaged with the lowermost of the teeth 66 of the escapement wheel 65. When the dog 79, 80 is released by the actuation of the dog rocker, it is stepped to alimited extent, as determined by the usual stop, under the operation of a dog spring 81 which is connected to the tail of the dog and also anchored to the dog rocker. Secured to the rear face of the rocker arm' 72 is a fixed or holding dog 82 having a. beveled contact face 83, this dog being normally disconnected from the escapement wheel 65. Ad-

just-ably secured to and depending from the dog rocker or carrier 71 is an arm 84, which below the pivot or axis ofthe dog rocker is provided with a laterally extending headed pin 85, said pin being engaged by the slot.- ted or bifurcated rear end of the connector or push link 32. The dog rocker or carrier 1 71 is provided with a rocker spring 86, the rear end of which is connected to the rocker below its pivot, the front end of said spring being anchored to an adjustable fin 'er or anchor member 87 secured to the bracket 58 (Figs. 1 and 8). The rocker spring 86 nor mally maintains a stop 88 carried by the rocker in contact with a stationary stop face 89. The rocking or forward vibratory movement of the rocker is limited by a stop 90 carried thereby and which is adapted to contact with a stationary stop face 91, (Fig. 2). A dog rocker and dogs substantially like those above described are shown in my prior application aforesaid.

When one of the printing keys 20 is depressed to actuate the connected type bar 7, the contact face 21 of said type bar will coact with the front edge of the curved universal bar 22 to swing the universal bar frame rearward rocking the shaft 28 and swinging its upstanding arms rearward. The rearward swing or movement of the middle arm 30 is transmitted to the link 32 which moves correspondin ly rearward and through the pin 85 rocks the dog carrier or rocker 71, swinging the upper portion of said rocker forward and causing thedog 79, 80 to disengage from the escapement wheel 65, 66 and the beveled dog 82, 83 to engage therewith. As soon as the dog 79, 80 is free of the wheel, it is stepped by its spring 81, so that on the return movement of the parts when the return swing of the rocker disengages the fixed dog and re-engages the steppreferably, so adjusted thatthe esca ement operation iscompleted so as to affor letter feeding movement of the carriage very shortly after the type bar has prmted or vcontacted with the laten and when said bar has moved only a siort distance away from the platen on its-return towards normal position. It will be understood that each time one ofthe printing keys is actuated, causing the connected. type bar to print, there results an actuation through the universal 'bar 22 and the described train of'connections of the escapementmechanism comprising the escapementwheel 65, 66, the dogs 79, 80, and 82, 83, and of the dogrocker 71, such operation of the 'escapement mechanism affording a unit; of letter space movement of the carriage imprinting or leftward dn'ection under the impulse ofthe carria e power 1 separate train of connections controlled by or main spring 69. The describe escapement mechanism afl'ords an ordinary feed during the return stroke of a key, as contrasted with the other or second escapement mechanism which affords a reverse feed.

Said second escapement mechanism 1s complete in itself and is operated independently of the first escapement mechanism by a the space key or bar 33. The second mechanism comprises, as appears from Figures 1, 2 and 7 to 10, an escapement wheel 92 .ring being disposed in front of the escapement wheel 92 and concentric with the shaft 49 and the sleeve 48 by which said annulus is supported. The annulus, dog carrier or rocker 95 is provided with diametrically opposite pivots in the form of shouldered screws 96 which are threaded through enlargements or bosses 97 on the annulus, the inner reduced ends 98 of the pivot projecting inward outside the bosses and providing the pivots proper.- The pivotal portions 98 are plain and engage in depressions 99 formed in opposite ends of a trunnion-like bearing comprising a hub portion 100 and arms or extensions 101, said arms projecting from the hub 100 diametrically opposite to each other, and their end portions being formed with the depressions or bearing openings 99 in which the pivot screws 96, 98 engage. The'bearing member 100, 101 is fixedly secured to the sleeve 48 by means of a headed screw 102 said screw passing ;Said' dog is a through the hub 100-and engagin in a deression or hole in the sleeve 48. owever, stopsshort of the enlargement or bearin 51 on the shaft49 leaving the sleeve.

48 an the bearin' member 100, 101 free to be rotated toget or independently of the shaft under certain conditions. lus 95 provides. a sup rt for a air of dogs which co-operate w1t the teet 93 of the wheel 92. One of .the dogs is in'the form of an arm 103 which is ivoted" on a screw pivot 104 secured in a ug 105 rojecting inward from the ring 95. The dbg 103is provided at its outer end with a rearwardly projecting engaging portion or tooth 106.

apte

pivot 1-04. in a cut-out 107 formed'in the an- The annu-,

to play or swing on its he screw,

nulus-95, theopposite walls 108 and 109 of the cut-out providing stops to limit the swinging or stepping movements of the do on its-p1vot 104. Said dog is provided wit 1 a spring 110, one end of which ishooked through a hole 111 in the dog, the opposite end of the spring being anchored to a pin 112 projecting from 8. lug 113 extending laterally from one of the arms 101. The fixed dog, in the form of a lug 114, is integralv with and projects rearward from the annulus diametrically o posite from the loosedog 103,106. The d atopposite sides of their rings pivotal axis og's are arranged and are oppositel beveled from the bevels of. the crown'ratc et'teeth 93. The'dog 114 has a straight engaging face 115 extending 'fore-and-aft of the machine in correspondence with the engaging or contact faces of the teeth 93, the construction bein such that, the teeth 114 and 93 detent eac other in one direction of rotation but are adapted to slide rearwardly over eachother during rotation in the opposite direction. The dog tooth 106:is adapted similarly to co-operate with the wheelteeth 93. The ring or dog carrier 95 is maintained in the normal position illustrated in Figs. 1 and 8 by a spring 116 which is coiled around one of the arms or trunnions 101, one end of the spring being anchored to a pin 117 on the hub 100 and the opposite end pressing against the face of the ring 95 at one side of its pivotal axis so that it tends constantly to main-- tain the holding dog 114 engaged with the escapement wheel 92. It -Wlll be apparent that by rocking the carrier 95 on its support or bearing 100, 101 transversely of the plane of the wheel '92, 93, the normally engaged fixed dog 114 will be swung forward out of said wheel and the stepping dog 103, 106 I will be swung rearward to engage with said wheel. In other words, the 'dog carrier and dogs will be rocked or vibrated in one direction so as to engage the stepping dog and aflford a relative turning movement between said dog and its support or ring 95, resulting in an escapementmovement during the first half of the complete vibration of the ring on its pivots 96, 98. During these v1- brations the wheel 92, 93 will remain motionless, the ring 95 turning bodily, instead, in a plane parallel with the plane of the wheel 92, 93. Projecting from the front side of the ring 95 about opposite the stepping dog is a lug 118 which serves as 'a contact or engaging (lBVlCe for the means whereby the dog rocker or ring 95 swivels or is vibrated back and forth on its pivots.

The vibrating means for the rocker 95 1s, as stated, controlled or operated from the space key 33. The train of connections between the space key and the rocker or swiveling member 95 comprises a contact or engaging device in the form of a lug or rearward projection 119 integral with an arm 120 which is integral with and extends radially from the rear end of a sleeve 121. Said sleeve 121 surrounds the sleeve 48, being adapted to slide back and forth on the sleeve 48 between the pinion 47 and the hub 100, said sleeve 121 having a limited movement fore-and-aft of the machine; The two sleeves 48 and 121 are forced to turn or rotate together by means of a connection comprising a pin 122 projecting horizontally forward from the bearing member 101 and passing through a hole in the side of the arm 120, thus slidably connecting the arm with the pin. The construction is such that while the sliding movements of the sleeve 121 are not interfered with, it is always maintained by means of the pin 122 in a. constant relationship rotatively considered with the sleeve 48 and the annulus 95 thereon, so that the contacts or engaging devices 118 and 119 are always opposite each other. The sleeve 121 is provided with two annuluar flanges 123 which are spaced apart to provide a circular groove or trackway indicated at 124 in which engages a pin or roller 125 mounted on and projecting laterally inward from the upper end of a lever 126. Said lever as shown clearly in Figs. 1 and 2, is of the first order, its upper arm below the roller 125 being curved or off-set as indicated at 127 to provide clearance for the strap 70. The lever 126 is fulcrumed on a pivot screw 128 which projects laterally from a bracket or support 129 fixed to or' integral with the front side of the bracket 58. The lower downwardly extending arm of the lever 126 is inclined forward and is provided at its end with a laterally projecting screw or contact device 130 which lies in the path of and is engageable by the contact face 37 of the arm 37. The normal position of the lever 126 is determined by an adjustable screw stop 131 which is threaded through the bracket 129 and projects forward therefrom, said stop co-operating with a laterally bent portion or lip 132 on the lever 126. The stops 132 and 131 are maintained normally engaged, as in Figure 1, by a coiled draw spring 133 which is hooked over a pin 134 on the lever 126, the opposite end ,of said spring being anchored to a pin 135 on the bracket 129.

It will be understood that when the space key or bar 33 is depressed, rocking the shaft 35 and swinging the arm 37 upward and forward, said arm acting against the pin 130 will rock the lever 126, swinging its up per arm rearward and causing the pin or roller 125 to act against the rear flange 123 of the sleeve 121. to slide rearward, and the contact 119 carried by it will act against the contact 118 to swing the dog rocker or annulus 95 on its straight or right line axis through the pivots 98 from the position shown in Figure 1 to approximately the position shown in Figure 2. Asa result of this movement, the normally engaged fixed dog 114, 115 will be swung forward out of engagement with the escapement wheel 92, 93 and the loose dog 103, 106 will be swung into engagement with said wheel. As soon as the fixed dog disengages from the wheel and the loose dog engages therewith, a bodily rotary movement of the dog carrier 95 about the axis 49 is afforded, to an extent determined by the length of the slot 107. It will be understood that the loose dog 103, 106 at this time will be detented or held by the engaged tooth 93 of the escapement wheel 92, said wheel in turn, being held fixed by the escapement wheel 65, 66, which is prevented from rotating by reason of its engagement with its dog 79, 80. Consequently the annulus 95 will bearrested during its bodily turning movement as soon as the stop face 109 is brought into contact with the side of the loose dog. .This rotary movement or step of the annulus 95 and its axis or pivotal center is participated in by the sleeve 48 and the feed pinion 47 thus allowing the carriage to move leftward a letter space distance under the pull of the main spring. In effect, then, the feed of the carriage takes place during the depression of the space key 33, thus affording a reverse feed escapement, although the relative actions of the parts comprising the loose dog and its carrier are altered, the carrier in this instance moving and the contact faces of the dog remaining substantially in the same position. However, the result is the same, the dog and its carrier combining to provide a relative stepping movement, and stretching the dog spring 110. Hence, on the release of the space key and the return of the parts to normal position under the impulse of the various restoring springs, comprising the springs 43, 133 and 116, the loose dog will be swung on and independently of the carrier 95by spring 110, turning on the pivot 104 away from the stop 109 until arrested Said sleeve is thus forced caused to rotate, in the present instance.

At this point the connection between the feed pinion 47 and the escapement wheel 65, 66 may be referred to somewhat more at length. This connection is provided by the .escapement wheel 92, 93 and dogs of the second escapement mechanism, which serve in effect as a ratchet connection between the feed pinion and the escapement wheel 65. During letter feeding movements of the carriage as the pinion 47 turns, the annulus 95 will turn with it and the holding do or pawl 114 acting against the engaged toot of the wheel '92 will transmit the turning impulse to the Wheel 65, 66. Consequently when the dogs of the first escapement cooperate with the rotatory wheel under the action of the printing keys, said wheel will turn step-by-step to afford escapement movements. When the carriage is returned from left to right, the rotatory annulus 95 will likewise be bodily rotated and at the same time will vibrate rapidly on its pivots 98 to permit the rotatory dogs or pawls 114 and 103, 106 to swing in and out of the Wheel 92, 93 during such return movement. The bevels on the back faces of the dogs and wheel teeth insure against obstruction. Of course, it will be understood that the wheels 92 and 65 will remain substantially motionless during such return movement, preferably being held by a detent 136 of ordinary construction which co-operates with the escapement wheel 65, 66 in the usual manner to prevent backward rotation thereof. It will be seen that the second escapement mechanism not only functions as an escapement but performs an additional function,

providing means for operatively connectingv the first escapement with the carriage so as to afford letter feed movements thereof under control of the first escapement.

It will be understood that durin ordinary operations' of the printing an space keys, my improved double escapement mechanism will co-act in its different parts to afford the usual step-by-step feeding movements of the carriage from right to left. Some of the advantages of my invention will be better understood from a consideration of what takes place during an irregular operation of the machine, for example, when there occurs an actuation of the space bar before the completion of the preceding operation of the escapement under actuation of one of the printing keys. Thenormal relationship of the esca ement elements of both mechanlsms is i1 ustrated in Figure 1- and, diagrammatically, in Figure 3. As appears from these vlews, the tooth of the stepping dog of the first or rear escapement normal y engages with one of the escapement wheel teeth 66, while the holding dog tooth 83 is disengaged. Conversely, the holding dog 114 of the second or forward escapement is normally enga ed with one of the wheel teeth 93 while t e tooth 106 of the loose dog is normally disengaged. On depresslng a printing key 20, the first or rear escapement will be actuated independently of, or without effecting an operation of, the second escapement. The resulting relationships of the parts is diagrammatically shown in Fig. 4, which illustrates the results when a printing key has been fully depressed, and the space key is still normal. From said figure, it will be seen that the tooth 80 of the loose dog has been swung forward out of en ement with the tooth 66 and that the holding dog 83 has been brought into engagement therewith, when released, the stepping dog 80 steps forward as shown so that 1t is positioned to be engaged with the next following wheel tooth 66 on return ofthe parts towards normal position. As the return movement begins, due to the rising of the depressed printing key, the engaged wheel tooth 66 and the beveled dog tooth 83 will slide over each other. Let it be assumed that the depressed printing 'key has risen to the dotted line position of Figure 2' at which time while the type bar has been allowed to move slightly away from the platen, it is still in the zone preceding the let-off of the escapement operation. This will be clearly understood from Figure 5 which shows the wheel tooth 66 still en aged by the beveled dog tooth 83. With t e printing key and the escapement devices controlled by it in the described positions, let it be assumed that the space bar or key 33 is depressed. This results in an operation of the second or forward escapement mechanism, bringing the parts to the positions illustrated in Figs. 2 and 5 The depression of the space key results in swinging the ring or rocker 95 on its straight axis 'or pivots 96, 98, moving the dog tooth 114 forward away from the wheel tooth 93 and swinging the tooth 106 of the loose dog rearward to engage with the diametricall opposite wheel tooth 93. As soon as the olding dog 114 is clear of the escapement wheel, the rocker 95 is free to rotate bodily about the axis of the shaft 49 to an extent limited by the amount of individual movement of the dog 106, 103 as has been heretofore explained. This bodily rotation of'the rocker 95 affords a corresponding rotation of the sleeve 48 and pinion 4 resulting in a step or forward movement not been at all affected bv the fact that such operation occurs in the midst'of an operation of the first escapement under actuation of the key 20. If the space key now be released permitting the second escapement to return to normal position just prior to the let-ofl or completion of the operation in the first escapement, the parts will be in a position illustrated diagrammatically in Figure 6, which shows the dog 114 re-engaged with one of the teeth 93 of the crown escapementwheel 92, while the dog 106, 103 has disengaged therefrom due to the return rocking movement of the annulus 95 on its pivots 96. During such movement there will occur a slight movement between the beveled dog tooth 83 and the engaged wheel tooth 66 of the first escapement as will be understood from a comparison of Figs. 5 and 6. It will be apparent that a further slight additional upward movement of the depressed key 20 will permit the dog tooth 83 to swing back out of the escapement wheel 65, 66, bringing the stepping dog tooth into the plane of said wheel, and as soon as this occurs the let-off or escapement movement of the first escapement will take lace. It will be seen that the operation 0 this escapement will not be affected by the operation of the second escapement under actuation of the space key although such second escapement operation has intervened between the beginning and the ending of the operation of the first escapement under the actuation of the key 20. In other words, the operations of the two escapement mechanisms will not be affected by any irregularities of timing of their controlling keys; and the same results will be attained, that is, there will be two full and complete step-by-step feeding movements, should a printing key and a space key be depressed at approximately the same time. Thus under a variety of conditions, there is always assurance that the escapement mechanisms will function properly, af-

fording regular spacing between characters and between words.

Various chan es may be made without departing from my invention.

hat I claim as new and desire to secure by Letters Patent is 1. In a typewriting machine, the combination of a power driven carriage, an escapement wheel, a key operated dog rocker, dogs mounted on said dog rocker and co-operative with said escapement wheel, and means separate from said dogs for operatively connecting said dog rocker with said carriage.

:2. In a typewriting machine, the combina tion of a power driven carriage, a toothed rack, means for preventing movement of said rack during escapement operations, a dog carrier, dogs on said carrier, and means for operatlvely connecting said carrier with said carriage independently of said rack.

3. In a typewriting machine, the combination of a power driven carriage, a toothed rack, means for preventing movement of said rack during escapement operations, a key operated dog carrier connected to said carriage, dogs on said carrier, and means for eflectmg rotary movements of said dog carrier to change its normal relationship to said rack during escapement operations. I

4. In a typewriting machine, the combination of a power driven carriage, a toothed rack, means for preventing movement of said. rack during escapement operations, a dog carrier mountedfor rotary and pivotal movements, dogs on said carrier, and means for effecting bodily rotary movements of said dog carrier during feeding movements of said carriage, said means comprising a space key effective when actuated to cause a pivotal movement of said carrier, said pivotal movement being in addition to the bodily rotary movements of said carrier.

5. In a typewriting machine, the combination of a power driven carriage, an escapement wheel, means for holding said wheel against rotation, a dog carrier, a loose dog, a fixed dog, both dogs mounted on said carrier, and means for moving said carrier during feeding movements of the carriage to effect co-operation of said dogs with successive teeth of said escapement wheel.

6. In a typewriting machine, the combina tion of a power driven carriage, an escapement wheel, means for holding said wheel against rotation, a do carrier, a loose dog on said carrier, a fixed dog on said carrier, and means for moving said carrier during feeding movements of the carriage to effect co-operation of said dogs with successive teeth of said escapement wheel, said means comprising a space key effective when actuated to vibrate said carrier to causeone of said dogs to engage and the other to dis en age said escapement wheel.

I. In a typewriting machine, the combination of two escapement'wheels connected together, one having radial teeth and one havlng crown teeth, reciprocatory dogs co-operative with theradial teeth, and rotatory dogs co-operative with the crown teeth.

8., In escapement mechanism for the power driven carriage of a typewriting machine, the combination of a rack, co-operating dogs, and a key controlled dog carrying element constantly connected to the carriage, the escapement movements being effected as the result of movements of said element under the im ulse both of its controlling key and of said carriage while said rack remains fixed.

9. In escapement mechanism for the power driven carriage of a typewriting ma- 4 power driven carriage of a typewriting machine, the combination of a rack, co-operating dogs, a dog carrying element, means for both vibrating said element on an axis and also for bodily moving said element and changing the location of said axis, and means for maintaining said rack fixed during the movements of said ddg carrying element.

11. In a typewriting machine, the combination of an escapement rack, co-operating' dogs, a dog carrying element, connections between said element and the carriage whereby the normal position of said element is altered at each escapement operation, an actuating device having a constant normal relationshipwith said element, and an operating train for said actuating device comprising a key having a constant normal position.

12. In a typewriting machine, the combination of a travelin carriage, an escapement rack, co-operatlng dogs, a dog carrying element, connections between said element and said carriage whereby the normal position of said element is altered at each escapement operation,-an actuating device having an unvarying normal relationship with said element, a rotary sleeve on which said device is mounted, a lever operative on said sleeve, and a key controlled rocking arm connected to said key and connected to said lever.

13. In a typewriting machine, the combination of a traveling carriage, a circular escapement rack separate from said carriage and adapted to remain motionless during traveling movements of the carriage, escapeme'nt dogs co-operative with said rack,

- a dog carrier for said dogs, connections between said dog carrier and said carriage whereby said carrier is rotated step-by-step as the carriage is stepped, an actuating device for said carrier having a constant re= lationship therewith, 'a key having a con-- stant normal position and connections between said key and said actuating device.

14. In escapement mechanism for the power driven carriage of a typewriting machine, the combination of a rack, co-operating dogs, a dog carrying element, a space key, and means or both vibrating said element on an axis and also for bodily moving said element and changihg the position of said axis, the vibratory movements of said element being under control of the space key of the machine.

.15. In escapement mechanism for the chine, the combination of an escapement.

wheel, a dog carrier rotatable on the axis of said escapement wheel, dogs on said carrier, and key controlled means for vibrating said carrier to cause said dogs to alternatively co-operate with said wheel, said carrier being connected with said carriage to rotate during letter feeding movements of said carriag 17. In a typewriting machine, the combination of a circular escapement rack, dogs co-operative therewith, a dog rocker, a power driven carriage, operative connections between said carriage and said dog rocker for moving said rocker bodily, and key controlled means'for rocking said rocker to cause said connections to become effective.

18. In a typewriting machine, the combination of a circular escapement rack, dogs co-operative therewith, a dog rocker, a power. driven carriage, operative connections separate from said dogs between said carriage and said dog rocker, a space key, and a train of devices between. said space key and said rocker for vibrating said rocker and causing said connections to operate.

19. In a typewriting machine, the combination of a power driven carriage; an escapement. rack; dogs co-operative therewith; a do rocker; operative connections between sa1 carriage and said do rocker, said connections comprising a fee pinion,

20. In a typewriting machine, the combination of an escapement rack; dogs codriven carriage; operative connections between said carriage and said dog rocker, said connections comprising a feed pinion, a sleeve to which said feed pinion is fixed, and a pivotal support for said dog rocker also fixed to said sleeve; a space key; and a train of connections between said space key and said dog rocker. 21. In a typewriting machine, the combination of an escapement rack, dogs cooperative therewith, a dog rocker, a power driven carriage, operative connections between said carriage and said dog rocker effective'to move said rocker, and key controlled means for rocking said rocker to cause said connections to become efi'ective, said key controlled means comprising a space key, a rockshaft operative thereby, an arm. fixed to said rock shaft, a lever driven carriage; means for rocking said rocker comprising aspace key, a lever operative thereby, a sleeve slldable .by said lever, and a contact on said sleeve and cry gageable with said rocker; and means for causing said rocker and said sleeve to rotate together.

23. In escapement mechanism. I for the rack, an annular dog carrier rotatable c0- axially with said rack, a pair o fdogs mount ed diametrically opposite each other on sa d annular dog carrier, a support on which sald dog carrier is pivoted, means connected .wlth

the carriage for rotating said support, and

means for vibrating said annular carrier. 7, 24. In escapement mechanism for the power driven carriage of a typewriting machine, the combination of a circular toothed rack, an annular dog carrier rotatable about the axis of said rack, a pair of dogs moun-t ed diametrically opposite each other'on said annular dog carrier, one of said dogs being fixed to said carrier and the otherbeing pivoted thereto and spring mounted, a support on which said dog carrier is pivoted, connections with the'carriage "for rotating said support, and means for vibrating said annular carrier.

25. In a typewriting machine, the combination of a power driven carriage; two

- escapementmechanisms each comprising a pivoted dog rocker and an escapement wheel, the two escapement wheels being maintained in a fixedrelationship; and key actuated means for separately operating said escapement mechanisms.

26. In a typewriting machine, the combination of a power driven carriage; two

. escapement mechanisms each comprising a pivoted dog rocker and an escapement wheel, the two escapement wheels bein maintained in a fixed relationship; a typear-operated universal bar connected to one of said dog rockers; and a space bar connected to the.

other of said dog rockers.v

27. In a typewriting machine, the combination of a power driven carriage; two escapement mechanisms each comprising a pivoted dog rocker and an escapement wheel, the two escapement wheels being maintained in a fixed relationship, one of said dog rockers having a fixe'd pivotal axis and the otal axis and the other do a other dog rocker having a bodily movable swinging said dog rockers on their axes.

28. In a typewritin machine, the combination of a power 51' escapement mechanisms each comprising. a

pivoted'dog rocker and an escapement wheel,

one; of said dog having a constant fixed relationship to said feed pinion; and means for separately actuatin said dog rockers.-

iven carriage; two

one dog rockerjhaving a fixed pivotal axis and the other having a rotary pivotal axis; and means for separately operating said dog rockers. I 31. In a typewritin bination of a power riven carriage; two

iven carriage two machine, the com .pivotal axis; and means for separately 1 ,wheels,.th,e pivot of one'of said dog rockers Y power driven carriage of a typewritmg Inachine, the combination of a clrcular toothed.

;n a typ'ewriting machine, the com- 1 'bination of a power r escapement mechanisms each comprising an escapement wheel and a pivoted dog rocker,"

escapement mechanisms each comprising an escapement wheel, and a co-operative escapement dog; key controlled means for operating said escapement mechanisms; and a oneway connectlon between the power driven vcarriage and one of the said escapement wheels oomprlsing the other escapement wheel and its oo-operating dog.

32. In 'a typewritin bination of a power riven carriage; two escapement mechanisms each comprising an escapement wheel, a co-operating dog, and a dog rocker; key controlled devices for actuating said dog rockers; and connections between one of said escapement wheels and the carriage, said connections comprising the other escapement wheel together with 4 its co-operating dog and the dog rocker on which said co-operating dog is mounted.

7 machine, the com-v 33. In escapement mechamsm for the trav-' eling carriage of a typewriting machine, the combination of a'double rack member, the two racks thereof having a constant relationship, and key controlled dogs co -operative with the two racks, the'rack member being adapted to aiford step-by-step' advance movements of the carriage both when the 'rack member itself movesand'also when it remains motionless.

34. In escapement mechanism for the travcling carriage of a typewriting machine, the com ination of a double escapement wheel, the two 'setsof teeth thereof having a conadvance movements of the carriage when said wheel rotates under co-action with one pair of dogs and also when it remains motionless during co-action with the other pair of dogs.

35. In escapement mechanism for the traveli carriage of a typewriting machine the cori iiination of an escapement wheel aving radial teeth, an escapement wheel having crown teeth, a do rocker provided with dogs at one side of its pivot for co-operation with the radially toothed wheel, a second dog rocker provided with dogs at opposite sides of its pivot for co-operation with the crown toothed wheel, and key controlled means for actuating said dog rockers.

36. In escapement mechanism for the traveling carriage of a typewriting machine. the combination of an escapement wheel having radial teeth, an escapement wheel having crown teeth, a dog rocker provided with dogs at one side of its pivot for cooperation with the radially toothed wheel, a second dog rocker provided with dogs at opposite sides of its pivot for co-operation with the crown toothed wheel, means opera- 1 t'ive by the printing keys for actuating one dog rocker, and separate means operative by the space key of the machine for actuating the other dog rocker.

37 In a typewriting machine, the combination of a power driven carriage, two escapement mechanisms for said carriage, said mechanisms being separately operative and each comprising an escapement wheel and a co-operating dog,- and means includin one of the do 5 and its co-oper'ating whee for operative y connecting both of said mechanisms with the carria e. v

38. In a typewriting mac ine, the combination of a power driven carriage, two coinplete escapement mechanisms each comprismg an escapement wheel and a dog carrying rocker, printin keys for operating one of said roc ers on y, a space key 0 erative on the other rocker, and means inc uding one of the rockers and its associate escapement wheel for operatively connecting the other escapement wheel with said carriage.

39. Double escapement mechanism 7 for typewriting machines comprising in combination a rotatory escapement wheel and re-v ciprocatory dogs therefor, and also comprising a second escapement wheel and rotatory dogs co-acting therewith, said double escape-- ment mechanism being operatively connected to the carriage of the machine.

40. In a t ewriting machine rovided with printing eys and a space key, the combination of a rotatory escapement wheel, reciprocatory dogs therefor, a second escapement wheel, and rotatory dogs co-a'cting therewith, said escapement wheels and their cooperating dogs constituting double escapement mechanism which is operatively connected to the traveling carriage of the machine, the printin keys actuating the reciprocatory dogs an the'space keys actuating the rotatory dogs.

Si ned at the borough of Manhattan, cit of N izw York, in the count of New Yor and State of New York .1; is 2nd day of February, A. D. 1924.

EDWIN E. BARNEY.

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