US1631197A - Typewriting machine - Google Patents

Description

7 2 2 r N. hm w t u N Q LIM H m W WW QQ \k Mm m 1L. m M 6 mm. E wk ERQ NW9, 3 W m l w z: 5 1% J M w R t 1 6% x J mm mm 3 w 2 mw hm \m 3 5 Q L y m B E 5 N a m m N m II M 2 o G G m e m m m a G E .m w i T F m! w%\ .W% QQ. R. m E 5 7 QM. m u I 1 Patented June 7, 1927.

UNITED STATES PATENT OFFICE.

GEORGE G. GOING, OF MIDDLETOWN, CONNECTICUT, ASSIGNOR T0 REMINGTON NOISE- LESS TYPEWRITER CORPORATION, OF YORK.

NEW YORK, N. Y.,'A CORPORATION OF NEW TYPEWRITING MACHINE.

Application filed December 2, 1925. Serial No. 72,795.

My present invention relates to carriage feeding or escapement devices for typewriting machines, and its chief object is to provide new and improved devices of the character specified and which are particularly adapted to cure defects heretofore found in such devices.

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

In carrying out my invention, I provide a three-dog escapement mechanism, the dogs being mounted or controlled by a carrier or rocker which is mounted to vibrate transversely of the circular escapement rack or wheel and carries two dogs which are relatively ofi-set so as to afford a drop both during the forward and return movement of the rocker, resulting in a complete escapement movement and a corresponding advance of the carriage in letter space direction, the two dogs having a constant or unvarying relationship during escapement operations effected by the printing keys. The third dog is normally out of the path of the escapement wheel and is mounted pivotally to swing in the plane of the wheel instead of transversely thereof, this third dog being actuated only by the space key or bar. The carrier or bod of the third dog is provided with a pin W ich coacts with the tail portion of the normally engaged dog to swing the latter out of the escapement wheel when the third dog swings in, giving in effect an anchor escapement, the dogs constituting which vibrate in the plane of the escapement wheel when the space key is actuated, it being borne in mind that the space key is ineffective to actuate the dog rocker or which remains stationary except when actuated by the printing keys, the dog rocker primarily receives its vibratory movement from the momentum of the type action. The machine to which the invention is shown as applied is the No. 6 Remington noiseless .typewriting machine, the type action whereof comprises a so-called momentum accumulator or gravity weight which in thepresent instance effects the main portion of the body a rocker movement. In other words, the operating part of the forward swing and the first part of the return swing rocker, whereby the normally disengaged dog is carried into and out of the escapement wheel, is effected independently of the printing keys. Consequently if a printing keybe held depressed following a printing operation, said dog nevertheless will swing back out of the path of the wheel and therefore even with the printing key held depressed the space bar may be actuated to effect a feed movement of the carriage. Conversely if the space bar be held down the construe-- tion is such that a feed movement may be effected by actuating one of the printing keys. By the employment of my invention the defect known as doubling at the end ing and beginning of words, or the printing of a character in what should be a blank space, is substantially eliminated.

My invention will be more specifically described and explained in connection with'the accompanying drawings wherein:

Fig. 1 is a fragmentary front-to-rear vertical sectional view showing in skeletonized form the escapement mechanism and the trains of operating devices therefor.

Fig. 2 is a horizontal sectional view taken on a plane above the escapement wheel, and drawn to a larger scale than Fig. 1.

Fig. 3 is a vertical sectional view taken on a plane indicated by the broken section line 11 in Fig. 2 and looking in the direction of the arrows at said line.

Fig. 4 is a transverse vertical sectional view taken on a plane indicated by the section line 22 in Fig. 2 and looking in the direction of the arrows at said line.

Fig. 5 is a fragmentary sectional view corresponding to Fig. 2 but omitting some of the parts shown in said Fig. 2 and showing other parts in different relationships.

of the dog larly Fig. 1).

link 5 which connects the type 30 ots.

constructed. The main frame is for the most part omitted from the drawing, only the cross portion 1 which connects the side plates at the front being shown (see Also there are shown in said Fig. 1 frame bars or cross bars 2 and 3 which provide connections between the side plates. Each of the type bars 4 is operative by a train of connections comprising a bar with an arm 6 having a fixed pivot 7, the arm in turn being operative by a momentum accumulator 8 which receives motion from a driving lever 9 having a fixed pivot 10.

The driving lever has a rolling connection with a sub-lever 11 having a stationary pivot 12 and connected by a link 13 with a key lever 14, said key lever being provided at its front end with a key cap or key 15 and being pivotally supported towards the rear of the machine. Suspended from the driving lever 9 at 16 is a link 17, the lower end portion whereof is forked to straddle a horizontally disposed arcuate universal bar 18 which is part of a frame 19 having extensions 20. The extensions are pivotally connected at 21 with arms 22 fixed to and extending rearward from a square rock shaft 23, having stationary piv- Fixed to the rock shaft is a downwardly extending arm 24, to which is pivoted at 25 the forward end of a rearwardly extending link 26 which is operative on the dog carrier or rocker of the escapement mechanism as hereinafterdescribed.

The escapement mechanism is also operative by the space bar or key 27 which extends transversely of the machine above and slightly to the rear of the cross bar 1, being supported by arms 28 whichare' fixed to a rock shaft 29 pivoted at its ends on adjustable screw pivots 30, supported on arms 31 which are integral with and extend rearward and downward from the cross bar 2. Also fixed to the rock shaft 29 and extending upward and rearward therefrom is a crank arm 32 carrying a lateral screw 33 around which is hooked the forward end of a link 34 which is operative on the escapement mechanism as hereinafter described.

The side arms 28 of the spacing frame are provided with horizontal ears 35 to which are adjustably secured supports 36 each carrying a stop pad 37, said stop pads normally maintained in contactwith the underface of the stationary bar 2 by a wire restoring spring 38 which is coiled around the rock shaft 29 and constantly tends to swing the spacing frame upward about said shaft asapivotal center. Downward movements of the spacing frame are limited by stop pads 39 mounted on lugs 40 projecting from the bar 1, said pads being adapted to arrest the space bar 27 at the downward limit of its movement. Downward movements of the key levers 14 are positively limited by stop devices comprising fixed stop pins 41 which enter enlarged holes 42 formed in the rear arms of the sub-levers 11. The lower side wall of the hole 42 of each sub-lever is adapted to contact with the stop pin 41 during the depression of the associate printing key 15, thus positively arresting the sub-lever 11, the link 13, and the key lever 14, this arrest taking place before the type bar has contacted with the platen. However the rolling contact between the lever 11 and the driving lever 9 affords further movement of the driving lever and connected parts and permits the momentum accumulator 8, acting on the type bar 4, to complete the movement of the type bar after the arrest of the key lever and cause said type bar to coact with the front or printing face of the platen. The type action in its preferred form is more fully disclosed and claimed in my pending application Sr. 39,193, filed June 24, 1925.

The platen shown diagrammatically in Fig. 1 and designated as 43 is mounted rotatively in a travelling carriage comprising end bars 44 and a connectingcross bar 45. Said cross bar is oppositely grooved to receive anti-friction rollers 46 which are adapted to travel in the oppositely grooved walls of a trough-like track-bar or shiftrail 47, said rail being mounted shiftably to change case preferably in the manner disclosed and claimed in my pending application Sr. 14,100, filed March 9, 1925.

The up and down case shifting move ments of the platen are participated in by a feed rack 48 mounted on the carriage, and constantly meshing with a feed pinion 49 which is secured to the upper end of a vertical shaft 50. The upper end portion of the shaft is adapted to rotate in a bearing member or bracket 51 which is supported from the shift rail 47. The lower end portion of the shaft is grooved, as indicated at 50 to cooperate with rollers 52 mounted to turn in downward extensions 53 which are integral with an escapement wheel 54, provided with radial teeth 55 and having an upwardly extending hub portion 56 which is further reduced at its upper end to receive a brake wheel 57. The brake wheel is rigidly secured to the escapement wheel member 5356 and cooperates with the hub thereof to provide a groove or depressed portion which bears in the horizontally disposed cross bar 58 of a'bracket which further comprises end portions or arms 59 turned upward vertically and provided with slots 60 which receive headed screws 61 whereby the bracket is adjust-ably secured to lugs 3 integral with the frame bar 3. Said bracket further comprises arms 62 extending downward and rearward from the arms 59. The

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construction is such that the shaft is supported at its upper end on the carriage shift rail 47 and at its lower end on the stationary bracket 5859, the escapement wheel memher 53-56 bearing rotatively in said bracket and the lower end portion of the shaft 50 being-supported by the rollers 52 mounted on the Wheel member. The connection between the shaft and the wheel member is such that rotation of the shaft will force the wheel to turn with it during escapement operations, the power of the spring drum or motor (not shown), with which the carriage is connected and from which it receives its impulses, being transmitted through rack 48 and pinion 49 to the shaft 50. Also the rollers 52, by reason of their rolling engagement with the grooves 50 permit the shaft 50 to move upward and downward during case shifting movements of the carriage without breaking the operative connection with the escapement wheel which, being mounted on the stationary bracket'5859, does not participate in such case shifting movements.

In order to carry out the purposes of my invention I provide a dog rocker or carrier which is adapted to vibrate transversely of the escapement wheel under control of the printing keys, so as to cause a pair of dogs that are mounted on the dog rocker to cooperate with the escapement wheel to afford an escapement or letter space feed movement of the carriage each time a printing key is struck. The dog rocker or carrier designated as a whole by the reference numeral 63 is preferably made of a single piece of sheet metal and comprises a body portion 64 horizontally arranged and somewhat depressed midway of its length as indicated at 65, the body portion terminating at its ends in downwardly bent ears or extensions 66 and 67 Q The right-hand extension 66 is twisted at right angles and perforated to receive the rear end portion of the link 26 which projects through the ear 66 and is threaded on its rear end to receivea sleeve nut 26 and a locking nut 26 therefor. The left hand ear 67 of the dog rocker is'provided with an end Portion or extension 68 bent oif horizontally. Projecting forward horizontally from the depressed portion is an irregular shaped extension 69. The dog rocker is pivoted on coned pivot screws 70 and 71 which are adjustably secured in the arms 62 of the bracket 5859, the inneror coned' ends of said screws engaging in depresssions or hearing seats formed in the extensions 66 and 67 of the rocker 63. The screw 70 is I locked in place by a check nut 72 while the screw 71 is locked by an elongated nut 73. Integral or rigid with the extension 69 is a dog or pawl 74 which is adapted to cooperate with the teeth 55 of the escapement wheel, but is normally out of mesh with said offset downwardly so that said rigid dog 4 is in a plane beneath that of the escapement wheel. Normally cooperative with the escapement wheel is a dog member 75 which is angular in shape, comprising a forwardly extending tooth portion or dog proper 76 and a leftwardly extending tail 77. The dog member 75 is pivoted at 78 on the extension 69 of the dog rocker. During vibrations of the dog rocker the dog member 75 is maintained in constant unteeth, being varying relationship with the dog rocker,

the tail 77 being held in contact with a stop pin or abutment 79 by a coiled spring 80, one end of which is connected to a pin 81 projecting upward from the dog member at the right of its pivot 78, the opposite end of said spring being anchored to a pin 82 projecting upward from the right-hand end portion of the rocker extension 69.

To assist in swinging the dog rocker The other end of said.

85 the plate 84 which has a knurled periphery may be turned to wind or tighten the spring 83 to increase its tension or the rever=e. In other words, the plate and its securing means provide an adjustable anchorage for the spring 83. Engaging with rear face of the extension 68 opposite to the spring 83 is a stop arm 86 which is pivoted loosely on the nut 73 and is formed in its upper end portion with an ear 87 1n which is secured an adjustable screw stop 88 that is contacted with the rear face of the left-hand arm 62 to limit the return movements of the dog rocker under the impulse of the spring 83. It will be understood that when a printing key is actuated, causing the universal bar frame 18, 19, 20 to swing downward, the rock shaft 23 will receive motion through the arms 22, this motion being transmitted to the downwardly extending arm 24 which will swing forward, pulling forward the link 26, which through the head of the sleeve or nut 26 will act on the ear 66, swinging the dog rocker 63 on its pivots 71. As best shown in Fig. 2, the dogs or detents 74 and 76 are offset or out of line so as to afford a drop, as it is called, both during the initial half of the dog rocker vibration and also during the return movement of the rocker. When a key lever is depressed, actuating the type bar train, the rocker will be swung upward on its .stroke of the type bar and pivots 70 and 71, the momentum accumulator causing the dog 76 to be swung upward out of the escapement wheel, releasing the engaged tooth and permitting said wheel to start to turn. The reaction of the rocker, however, is so prompt that the dog 76 will swing back into the plane of the wheel just behind the released tooth 55, so as to arrest the escapement wheel by co-operating with the next succeeding or proximate wheel tooth, thus affording as a result of a complete vibration of the dog rocker a letter space feeding movement of the carriage, the movement being divided into two parts, one part taking place during the upward swing of the rocker and the other part takin place on the return or downward swing t ereof. It will be understood that during the escapement operation just described the dogs 7 4 and 76 will be maintained in unvarying relationship with each other and with the dog carrier or rocker, and that this same escapement operation will take place each time one of the printing keys is depressed and released, substantially all of the escapement movement taking place on of the key. The action is so rapid that the printing takes place before the carriage starts to move, giving the eflect of what is usually termed an ordinary feed or escapement operation. It is further to be noted that since the final portion of the printing the downwar movement ofv the universal bar take place after the printing key lever has been ar rest-ed by its stop 41, the link 26 which is operated fromthe universal bar also receives the final portion of its movement from the universal bar after the arrest of the rinting key lever. That is to say, the final portion of the dog rocker movement received from the link 26 takes place after the printing key lever has reached the end of its stroke or movement. The parts. are so constructed and arranged that the dog rocker will swing the normally en aged dog- 76 out of the escapement wheel a er the key lever has been arrested, this action of the dog rocker and dogs being due to the momentum imparted from the type bar'train and particularly from the momentum'accumulator 8. After the dog rocker has reached the end of its upward movement, it may as a consequence of the described construction swing back to carry the dog 74 down out of the wheel and bring the dog 76 back into the wheel before the depressed printing key lever is released. The consequence is that .even should a key lever be held depressed, the escapement mechanism will be restored sufiiciently to enable the space bar to be actuated without interfering with the operation of the escapement devices that are controlled by said space bar.

The escapement devices controlled by the the return stroke space bar comprise the dog member 75 and a third dog 89 which is arranged in the plane of the'escapement wheel as is the dog 75, said dog 89 being pivoted at 90 on a rocking member 91 which is pivoted in turn at 92 to the under side of the rocker extension 69. The dog 89 is adapted to vibrate on its pivot 90 between two stops, one constituted by a pin 93. projecting upward from the pivoted support or rocker 91, the other stop being constituted by an ear 94 upturned from the left-hand end portion of the member or rocker 91. Normally the dog 89 is maintained in contact with the stop pin 93, by a coiled spring 95, one end of which is hooked around an upstanding pin 96 on the dog 89, the other end of the spring 95 being anchored to the dog rocker. The pin 79 which affords a stop for the dog member 7 5 is supported on the member 91.

The member 91 is adapted to be turned on its pivot 92 by a U-shaped pivoted member or actuator formed of a single piece of sheet metal and comprising an upright body portion 97 and horizontal arms 98 and 99, extending inward from theends of the body portion. A rear extension .100 from the body portion 97 is adapted to contact with the inner face of the left-hand bracket arm 62 to provide a stop for the U-shaped member 97 when in normal position. This stop 100 is normally held against the arm 62 by a coiled restoringspring 101. which is anchored to a pin 102 upstanding from the middle portion of the rocker arm or bar 64, the forward end of said spring 101 being hooked through a hole 103 in the outer end of the arm 98. The member 97-99 is pivoted on a headed pivot screw 104 which is threaded up into the under side of the bracket 5859. the spring 101 said arm 98 an elongated hole or opening receives a pin 106, fixed to and extending upward from the member 91. The pinand slot devices 106, 105 provide constant operative connection between the member 91 and the operating member 97-99, which connection while permitting the member 91 to rock with the dog rocker under the action is formed with of the printing keys without disturbing the member 97-99 will yet nevertheless transmit movements of said member 9799 to the member 91 when received from the space bar. Motion is transmitted to the member 97-99 from the space bar through the link 34. The rear end portion of said link is threaded to receive a sleeve comprising a cylindrical body portion 107 and a hexagonal head 108. The sleeve is interior- .ly threaded so that it is adjustable on the rear end of the link 34 and is adapted to be secured in place after adjustment by a locking nut 109. The sleeve 107 fits loosely in a hole 110 formed in an ear 99 that 105 which 'Somewhat to the left of memes extends down from the inner end of the arm v99 (Fig. 4) and thus provides an operating connection between the link 84 and the member 97-99, the forward pull of the link under operation of the space bar 27 being transmitted through the head 108 to the member 9799 and thence through the pin 106 and hole 105 to the member 91. The member when thus actuated will be swung about its pivot 92 from the Figure 2 to the Figure 5 position. As the member is thus swung the pin 79 acting against the tail 77 will swing the dog member 75 on its pivot 78, overcoming the spring 80 and swinging the dog or tooth 76 out of the escapement wheel. At the same time that the dog 76 is disengaging from the engaged wheel tooth 55, the dog 89 will be swung into the wheel so that when the dog tooth 76 releases the wheel 54 it will turn in counterclockwiw direction until the point of the dog 89 is engaged by an oncoming wheel tooth 55, after which the movement of the wheel continues, carrying with it the dog 89 and causing said dog to turn about its pivot 90 until arrested by the stop 94 as shown in Fig. 5. It will be understood that this operation takes place during the depression of the space bar and that as a result a. letter space movement is aflorded which will advance the carriage a unit of lettei' space distance towards the left. It will also be apparent that this operation does not affect the dog rocker 63 which will remain quiescent in normal position, as will the dog 74. The dog member during this operation will, it will be seen, turn on its pivot 78 under actuation from the space bar, this turning movement being in the plane of the escapement wheel, whereas under actuation of the printing keys. the

dog vibrates transversely of the escapement wheel and without turning on its pivot, be-

ing held by the stop 79'which remains stationary. Upon release of the space bar the parts will return to normal position, the space bar train being restored by thespring 38, the members 97 and 91 being restored by the spring 101. Also the dog 89 when released from the escapement wheel will be turned back on its pivot 90 to engagement with the stop'93 by the spring 95, whilethe dog member 75 Wlllbe returned to normal position under the influence of its spring 80 which will operate constantly to main tain it in contact with the stop 79. This stop of course will be located normally by reason 'of the contact of the "stop 100 with the bracket'iarm 62.

From the foregoing it will be seen that under actuation of the space bar the escapement devices comprising the dogs 76 and 89 will cooperate with the escapement wheel 54, 55 to afford a letter space movement of the carriage during the depression of the space key or bar, this being in effect what is termed a reverse escapement. The dogs vibrate in the plane of the wheel and while both are pivoted separately and will turn on their separate pivots during the escapement operation, the eflect is substantially that obtained from an anchor escapement, so-called, as distinguished from the. operation eii'ected by the printing keys in which the two dogs 74 and 7 6 vibrate transversely oi the plane of the escapement wheel.

As has been stated, the advantages of the invention are such that even with a printing key held depressed or under a hcsitating stroke thereon, the space key or bar may be actuated to eflect an escapement movement during its downward or initial stroke. Furthermore it the space baa is held down one or more printing keys may still be actuated to efiect printing operations and corresponding letter feeding operations of the carriage. This results from the fact that with the space key depressed and the parts in the positions illustrated in Fig. 5, it is possible to actuate a printing key and rock the rocker 63 together with the member or rocker 91 about the pivots 70 and 71, swinging the dog 89 up out of the plane of the escapement wheel so that it disengages from the tooth 55 and permitting the escapement wheel 54 to start to turn or rotate. The dog 89 when clear'of the wheel tooth will tend to swing rightward under the pull of its spring 95. The construction is such that as the rocker swings back toward normal position the dog 89 will be interposed in the path of the oncoming wheel tooth 55 and will arrest the wheel when it has'turned to alford a letter space movement of the carriage. words, with the space bar held depressed the escapement will function under the operation of the printing keys to afl'ordletter feed movements of the carriage as under normal conditions, but with the difference that the dog 89 takes the place of the dog member 75.

In other The escapement mechanism, it will be obprimarily operative by the gravity weight or momentum accumulator of the type action. The parts are arranged so that the escapement wheel is released for its full movement as the actuating type bar approaches the paper, but the speed of the type action is so great that the printing operation will be efi'ected and the type bar separated from the paper before thecarriage has had time to move. The escapement operation is effected by the dog member 75 in cooperation with the e'scapement Wheel, the dog 74 not coming in contact with the escapement wheel teeth during normal operations under the actuation of the printing keys. lhe main function of the dog 74 is to prevent the carriage rapidly toward the left, should the type action be pushed in by hand, which occurs when the pressure of the type against the platen is being set or adjusted, at wh ch time the operator takes hold of the gravity weight and swings it in the direction of the printing point, regulating the pressure of the type against the paper by the feeling of resistance met with at the finish of the stroke.

It will be noted that by my present invention there is provided in an escapement mechanism for typewrit-ing machines the combination of a dog carrier or rocker, a dog rigid therewith, in the present instance the dog 74, and anchor escapement devices comprising two escapement dogs, 1n the present instance the dogs 76 and 89, one of which has an unvarying relationship with the aforesaid rigid dog during all escapement operations, controlled by the printing keys; that said dograrrier is adapted to vibrate to effect escapement movements while said rigid dog and one of the other dogs 6 in the present instance, are maintained in an unvarying relationship; that such vibratory movements of the rocker during wh ch the relationship of said two dogs remains constant is eifected only by the printing keys of the machine; that the third dog and the dog 76 operate in effect as an anchor escapement only under the control or actuation of the space bar of the machine; that during such anchor escapement operations said dog rocker remains quiescent or motionless; that said third dog has a pivotal mounting, which in the present instance is separate from or independent of said dog rocker, said third dog being pivoted on a support. in the present instance the member 91, which in turn is pivoted on the dog rocker 63; that said member 91 is in eiiect a second rocker,

which, however, is only adapted to be rocked on its own pivot 92 from the space bar, said second rocker 91 vibrating in effect as part of the first rocker or carrier 63 when the latter is operated by the printing keys; that of the three escapement dogs one only is operative both by the printing keys and the space bar, under normal conditions said one having a constant relationship with the dog rocker when said dog rocker is vibrated by the printing keys, but being mounted to be turned pivo'tally when the space bar is operated; that said last mentioned dog, namely the dog or member 7 5, acts as a holding dog under control both by the printing keys and the space bar; that said dog also is operative by each of the rocking devices or rockers 63 and 91 and has a pivotal connection with one of said rocking devices and a pin and slot or slide connection with the other; that means are provided on the second rocker, said means in the present instance being the pm or abutment 79, for preventing pivotal movements of the dog member during vi bratory movements of the rocker 91; that the means for actuating the second rocking device from the space bar comprises a pivoted actuator having an operative connection with the space bar and a yielding or pin-and-slot connection with the second rocking device; that the third dog cooperates with the toothed rack or escapement wheel to aitord an escapement operation in conjunction with one of the other dogs, during which operation the rocker 63 remains motionless ;'that said third dog is also adapted to vibrate with said rocker transversely of said rack to afford a feed movement of the carriage, this however, taking place only under abnormal conditions, or when the space bar is held depressed, at which time such vibration of said rocker and the third dog transversely of the rack or wheel results from the operation of one of the print ing keys; that there are provided in combination a rack or wheel, a dog rocker, and three escapement dogs, two of said dogs, namely the dogs 7 6 and 89, being adapted to be operated both by the printing keys and the space bar of the machine, each of said two dogs being adapted to act as a holding dog; that one of the dogs 76 is normally operative both by the printing keys and the space bar, while another of the dogs, 89, is normally operative only by the space bar, but under abnormal conditions is also operated by the printing keys; and that under such abnormal conditions, or when the space bar is held depressed, the said third dog acts as a holding dog.

Various changes may be made without departing from my invention.

What I claim as new and by Letters Patent, is

1. In an escapement mechanism for typewriting machines, the combination of a rack, a vibratory dog carrier, a dog rigid therewith, and anchor escapement devices comprising two escapement dogs, one of which has an unvarying relationship with said rigid dog during vibratory movements of said rocker.

2. In an escapement mechanism for typewriting machines, the combination of a pivotally mounted dog rocker, a dog rigid therewith, a second dog having an unvarying relationship with said rigid dog during escapement operations, in which said rigid dog particpatcs, and a third (log cooperating with said second dog to vibrate as an anchor escapement.

3. In an escapement mechanism for typewriting machines, the combination of a pivotally mounted dog rocker, a dog rigid therewith, a second dog having an unvarying relationship with said rigid dog during escapement operations, in which said rigid dog participates, and a third dog cooperatdesire to secure writing machines, the combination of a.

pivotally mounted dog rocker, a dog rigid therewith, a second dog having an unvarying relationship with said rigid dog during escapement operations, in which said rigid dog participates, and a third dog cooperatlng with said second dog to vibrate as an anchor escapement, said anchor escapement being operative only by the space bar of the machine, and said second dog and said rigid dog being operative only by the printing keys of the machine.

5. In an escapement mechanism for typewriting machines, the combination of a feed rack, a dog carrier movable transversely thereof, a pair of dogs thereon cooperative.

with said rack during such transverse movements to effect an escapement operation, sald dogs maintaining an unvarying relationship during such escapement operation, anda third dog cooperative with one of the first recited dogs to efiect an escapement operation in conjunction with said rack.

6. In an escapement mechanism for typewriting machines, the combination of a feed rack, a dog rocker pivoted to vibrate transversely of said rack, a pair of dogs thereon cooperative with said rack when said rocker is vibrated, the relationship of said dogs remaining constant during vibratory movev ments of said rocker, and a third dog cooperative with said rack to efi'ect an escapement operation in conjunction with one of said first recited dogs during which operation said rocker remains motionless.

7 In an escapement mechanism for typewriting machines, the combination of a feed rack, 21 dog rocker pivoted to vibrate transversely thereof, a dog rigid on said rocker, a second dog pivoted on said rocker, said dogs remaining in constant relationship during vibratory movements of said rocker to effect escapement operations, and a third dog cooperative with said pivoted dog to effect escapement operations in conjunction with said rack during which said rocker remains motionless. V

8. In an escapement mechanism for typewriting machines, the combination of a feed rack, a dog rocker pivoted to vibrate transversely thereof, a dog rigid on said rocker a second dog pivoted on said rocker, said dogs remaining in constant relationship during vibratory movements of said rocker to effect escapement operations, a third dog having a pivotal mounting, and means for causing said pivoted dogs to turn on their pivots to effect escapement operations independently of said dog rocker.

9. In an escapement mechanism for type writing machines, the combination of a feed rack, a dog rocker pivoted to vibrate transversely thereof, a dog rigid on said rocker, a second dog pivoted onsaid rocker, said dogs remaining in constant relationship during vibratorymovements of said rocker to effect escapement operations, a third dog pivotally mounted, and means for causing said pivoted dogs to turn on their pivots to effect escapement operations independently of said dog rocker, said means belng operative only by the space bar of the machine.

10. Inan escapement mechanism for typewri-ting machines, the combination of a feed rack, a dog rocker pivoted to vibrate trans versely thereof, a dog rigid on said rocker, a second dog pivoted on said rocker, said dogs remaining n constant relationship during vibratory movements of said rocker to effect escapement operations, a third dog pivoted independent of said dog rocker, and means for causing said pivoted dogs to turn on their pivots to effect escapement operations independently of said dog rocker, said means being operative only by the space bar of the machine, and the printing keys only being effective to vibrate said dog rocker.

11. In an escapement mechanism for typewriting machines, the combination of a rack, a dog rocker, three escapement dogs, one of said dogs only being normally operative both by the printing keys and the space bar of the machine, said dog having a constant relationship with the dog rocker when said rocker is actuated by the printing keys.

12. In an escapement mechanism for typewriting machines, the combination of a-'rack, a dog rocker, three escapement dogs, I

one of said dogs only being. normally operative both by the printing keys and the space bar of the machine, said dog having a constant relationship with the dog rocker when said rocker is actuated by the printing keys, said dog being mounted to be turned pivotally by the operation of the space bar.

13. In an escapement mechanism for typewriting machines, the combination of a rack, a dog rocker, and three escapement dogs, one of said dogs only being normally operative both by the printing keys and the space bar of the machine, said dog acting as a holding dog under control of both the printing ke s and the space bar. r

14. n escapement mechanism for typewriting machines, the combination of an escapement wheel, a dog rocker, a dog rigid therewith, a second dog pivoted thereon, a second'rocker, a third dog pivoted thereon,

and means on said second rocker for prethe printing keys, a rigid dog on said rocker,

/ a second, spring-pressed dog pivoted on said rocker, a second rocker operative by the space bar and supported on said first named rocker, and a third dog pivoted on said second rocker and spring pressed.

16. In escapement mechanism for typewriting machines, the combination of an escapement wheel, a dog rocker operative by the printing keys, a rigid dog on said rocker, a second spring pressed dog pivoted on said rocker, a second rocker pivoted on the first named rocker, a third do pivoted on said second rocker and normally out of the escapement wheel, a pivoted actuator for said second rocker operatively connected with the space bar of the machine, and a connection between said actuator and said second rocker affording movement of said second rocker independent of said actuator when the first named rocker is actuated.

17. In a typewriting machine, the combination of a travelling carriage, an escapement wheel operatively connected thereto, a key actuated dog rocker, a pair of dogs both directly supported thereon, a second rocker pivoted on said first named rocker, a third dog pivoted on said second rocker, a key operated actuator having a stationary pivot, and connections between said actuator and said second rocker.

18. In escapement mechanism for typewriting machines, the combination of an escapement Wheel, a dog rocker operative by the printing keys, a rigid dog on said rocker, a second, spring-pressed dog pivoted on said rocker, a'second rocker pivoted on the first named rocker, a third dog pivoted on said second rocker and normally out of the escapement wheel, a pivoted actuator having a stationary pivot, and a pin-and-slot connection between said actuator and said second rocker, said actuator being operative only by the space bar of the machine.

19. In a typewriting machine, the combination of a travelling carriage, an escapement wheel operatively connected thereto, a dog rocker having stationary pivotsand operative by the printing keys of the machine, a dog rigid on said rocker, a second, springpressed dog pivoted on said rocker,- means for preventing pivotal movements of said second dog when said rocker is vibrated, a second rocker pivoted on said first named rocker, a third dog pivoted on said second rocker and normally out of the escapement wheel, a U-shaped actuator having a stationary' pivot, a pin-and-slot connection between said actuator and said second rocker, a space bar, and connections between said space bar and said actuator, said conections remaining unaflected when said first named rocker is actuated.

20. In a typewriting machine, the combination of a travelling carriage, an escapement wheel operatively connected thereto, a

the machine, a dog rocker pivoted on said bracket, a dog rigid on said rocker and normally out of said escapement wheel, a second dog pivoted on said rocker and normally engaged with said escapement wheel, a spring for said second dog, means for preventing pivotal movements of said second dog when said rocker is vibrated, a second rocker pivoted on an extension of said first named rocker, a third dog pivoted on said second rocker and normally out of said escapement.

wheel, a U-shaped actuator pivoted on said bracket, spring means for maintaining said actuator in normal position, and a pin-andslot connection between said actuator and said second rocker, said actuator being operative by the space bar of the machine.

21. In an escapement mechanism for typewriting machines, the combination of a travelling carriage, an escapement wheel operatively connected thereto, a dog rocker pivoted to rock transversely of said escapement wheel, a pair of dogs on said rocker vibrating transversely of said wheel to afiord letter feed movements of said carriage, said dogs being maintained in unvarying relationshi during their vibratory movements, and a t ird dog cooperative with said wheel to afford an escapement operation in conjunction with one of said first recited dogs under the impulse of the space bar of the machine, during which operation said rocker remains motionless, said third dog being also adapted when the space bar is held down to vibrate with said rocker transversely of said wheel to afford afeed movement under the impulse of one of the printing keys.

22. In an escapement mechanism for typewriting machines, the combination of a carriage, a toothed rack, a dog rocker pivoted to vibrate transversely of said rack, a pair of dogs thereon adapted to vibrate with said rocker transversely of said rack to afi'or letter feed movements of the carriage, the relationship of said dogs remaining constant during such vibratory movements of said rocker, and a third dog cooperative with said rack to afiord an escapement operation in conjunction with one of said first named dogs during which operation said rocker remains motionless, said third dog being also adapted .to vibrate with said rocker transversely of said rack to afiord a feed movement of said carriage.

23. In an escapement mechanism for typewriting machines, the combination of a rack, a dog rocker, and three escapement dogs, two of said dogs being adapted to be operated both by the printing keys and the space bar of the machine, each of said two dogs being adapted to act as a holding dog.

24:. In an escapement mechanism for typewriting machines, the combination of an escapement wheel, a dog rocker and three escapement dogs, one of said dogs being normally operative both by the printing keys and the space bar of the machine, said dog acting as a holding dog under control of both the printing keys and the space bar, and another of said dogs being normally 0perative by the space bar and being also operative by the printing keys when the space bar is held depressed, at which time said last 1 named dog also acts as a holding dog.

Signed at Middletown, in the county of Middlesex and State of Connecticut, this 28th day of November, A. D. 1925.

GEORGE G. GOING.

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