US1804723A - Typewriting machine - Google Patents

Description

May 12, 1931f v RF vow REPPERT' 1,804,723

" TYPEWRITING MACHINE Filed Sept. 28 28 1 Affome? I Patented May 12, 1931 1 UNITED YsTATss PATENT OFFICE Brennan Von nnrrna'r, or HARTFORD, connncricu'r, ASSIGNOR T0 mmamwoon ELLIOTT rrsnna COMPANY, or NEW YORK, 1v. 1., A CORPORATION or DELAWARE TYPEWRITING MACHINE Application filed September 28, 192 8. Serial No. 308,947.

This invention relates to power-devices applicable to typewriters, and to combined typewriting and adding machines, and to other machines wherein type-bars or other devices are under control of keys to be selectively connected with the power-devices for actuation.

In the present design the key releases a pressure member which frictonally couples the corresponding typin mechanism with the universal power-mem or for typing operation and the pressure member is reset to normal position in the course of the typing stroke without separate resetting devices.

In this invention there is employed a continuousl rotating power-roller or barrel. The key oard is employed for the purpose of connecting this power-roller with the selected type-bars. Each type-bar train includes a driver, there being a row of drivers extending along the power-roller but normally out of engagement therewith. The depression of any key will cause the associated driver to connect its type-bar train with said power-roller. Each driver has an operating sprlng, but it is latched out of use. When a key is depressed, it releases thelatch and' allows the spring to shift the driver into posltion for type-bar operation. The driver is in the from of a' lever, and moreover carries a cam, said cam being rotatable upon the driver. This cam is swung rearwardly by said driver or lever as the latter is released. Said cam is thus brought into engagement with the front of a swingable clutch-member. These clutch-members extend in a row along the power-roller, but are normally out of mesh therewith. Each clutch-member has a beveled rear edge resembling a wedge, to fit into one of the V-shaped annular grooves that are formed along the periphery of the power-roller. When a wedge is pressed by its cam into its groove on the power-roller, the same is rotated by means of the roller, through friction of said clutch-member in said. groove. The clutch-member being connected toa type-bar, the latteri'sthereby actuated to strike against a work-sheet on the platen, and also. to operate a. computing meclianism, thereby bvercoming objection that computing mechanism is too hard to operate by means of typewriter-keys.

A feature of this invention lies in the means embodied in the pressure-levers, whereby, after release by the keys, said levers are automatically restored to a position where they are re-engaged by the key-members.

Another feature of this invention is the provision of rotatable cams, which automatically augment a slight key-pressure into a driving force of much greater magnitude. This increased force is used to actuatetypebars and computing mechanisms, and isreadily controlled by the keys. Because the latter merely release a latch instead of actuating the typing action, the operator is relieved of the strain of a heavy pressure on the keys. The augmentation of force is obtained through the use of rotatable cams having spiral perimeters, which engage the clutch-members and therethrough establish rolling friction between the wedges and the power-roller. As the clutch-members are rolled-by the powerroller, said members alsorotate the engaged cams. The latter, on account of their spiral perimeters, will act as wedges when rotated against spring-tension, and will force the clutch-members-into tighter engagement with the grooves on said roller. Frlction is thereby increased between said members and grooves, and increased driving force results, which is used to actuate typing and computing actions.

After the increased driving force has completed the typing action, the clutch-members are released from the grooves in the powerroller. Before such release, the cams have rotated to a point on the spiral perimeters which is farthest from their axes. As said perimeters travel in a fixed plane after the rearward movement of the clutch-members is stopped by the power-roller, the spirals of the cams gradually force their axes away.

fromsaid members. This lever-action of the cams serves to raise their supporting pressure-levers against spring-tension, and said levers are automatically re-engaged by spring-pressed key-members.

The raising of the pressure-levers disengages the; cams from the clutch-members,

which in turn are released from the powerroller. The clutch-members and connected type-bars are then restored through springtension. The cams when actuated perform two functions, they augment drivin force and transmit augmented retroactive orce to reset the pressure-levers against spring-tension. To increase the impelling friction between the clutch-members and cams, the engaging surfaces of each are knurled or toothed.

' This invention is in the nature of an improvement upon the inventions disclosed in my applications Serial No. 305,175, filed September 11 1928, and Serial No. 306,698, filed September 18, 1928; no claims being made herein that cover the inventions of either of said applications. d

Other features and advantages will hereinafter app-ear.

In the accompanying drawings,

Figure 1 is a vertical cross-sectional view of a typing machine drawn partly in outline, and showing this invention applied thereto.

Figure 2 is a detail view showing the parts of this invention as positioned when a typebar is about to strike the platen, as outlined in Figure 1.

Figure 3 1s a partial perspective view of a typewriter, and shows the positions of the parts of this invention just after a key has been depressed.

Figure 4 is a detail view of the parts of this invention after the pressure-lever has been engaged by a stepping lever, and before the key has been released.

Referring to.the drawings, keys 10 have stems 11 gulded by slots in an apron 12 which is attached through set-screws 13 to lugs 14 that are formed on the main frame 15 of the typewriter. Thestems 11 are pivotally attached at 16 to bellcranks 17 which are rotatably mounted on shafts 18 that are supported by, and fixed in, said main frame.

Said bell-cranks are equidistantly spaced on said shafts by spacers 19 and set-collars 20 of which latter only one is sliown.

The bell-cranks 17 are connected by links. 21 to releasing levers 22 rotatably mounted on a shaft 23Rwhich is fixed in the main frame 15. The releasing levers are spaced equidistantly on said shaft 23 by spacers 24 and setcollars 25 of which but one is shown. The. releasing levers are attached to contractilesprings 26 connected to a cross-bar 27 which is attached by screws 28 to lugs 29 formed on said main frame.

Formed on the main frame 15 are lugs 30 to which are attached by screws 31 a stopbar 32 against which the releasing levers normally rest. On said levers are stop-pins 33 functioning with an arm of stepping levers 34. The latter are pivotally mounted on studs 35 which ars also carried by said releasing levers. The stepping levers: have seats 36 and faces 37 and are connected to the releasing levers by contractile springs 38. Said releasing levers also have seats 39 and faces 40..

The releasing levers 22 and stepping levers I 34 are engageable with latches 41. The latter in side elevation are T-shaped, and extend above and are part of pressure-levers 42.- The pressure-levers are rotatably mounted on a shaft 43 which is attached to the main frame 15. Said pressure-levers are equidistantly spaced on the shaft by spacers 44, and

are held as a unit by set-collars 45 of which washers or flanges 52 carried by the studs- 49, or the lower ends of the pawl-levers may be offset. Such offsetting permits rotation of eccentric disks or cams 53 which interlie said pawl-levers and pressure-levers. The eccentric disks are mounted on studs or screws 54 which are carried by dependent arms 55 of said pressure-levers.

On one side of the eccentric disks 53 are pins 56 which are engaged by detents 57 that form part of the pawl-levers 50. The perimeters of said disks are equidistantly divided into cams 58 formed by intersecting curves and having knurled or toothed surfaces 59. The eccentric disks are engageable with knurled or toothed edges 60 of pendants 61 which have opposite edges formed into wedges 62. The pendants are pivotally journaled in bushings carried by the main frame 15. The power-roller at one end is attached to a worm-gear 66 and is rotated by a Worth 67, the worm-drive being enclosed in a gear-case 68. The worm is driven by a motor 69 having a variable s d-control, not shown. The gear-case an motor are both attached by bolts to said main frame.

The main levers64 are fulcrumed at 70 and are normally held in raised .position by springs 71 having supports on the main frame 15. Said main levers are connected to hellcranks 72 which swing type-bars 73 up and against a platen 74. Said type-bars normally lie on a rest 75, and when actuated strike a universal bai 76 to actuate an escapementmechanism, not shown. Said pgaten is mounted on studs 63 carried by main levers mounted on a shaft 77 which is journaled in a usual carriage 7 8 riding on rails.

Pivotally attached to the main levers 64 are stems 79 which connected with a totalizer,

levers.

In operation, the depression of a key 10 rotates a bell-crank 17 which, through a link 21, swings a releasing lever 22 against the tension of a spring 26 and away from the stop-bar 32. This slides a seat 39 from beneath a latch 41, andan arm of a pressurelever 42 is pulled down by a spring 46 which is anchored to the angle-bar 47. Said lever is rotated by said spring which swings a de pendent arm 55 toward the rear of the machine. Said arm carries an eccentric disk 53 having multiple cams 58, one of which en gages an interponent or pendant 61. The parts thus described will then lie as shown in Figure 3. I

As a cam 58 and a pendant 61 approach engagement, a flat or slightly spiral perimetral area of the cam is first resented to the pendant. This insures a large area of engagement when the two members are caused to abut. The advantage of this will hereinafter appear. The forced abutment ofsaid cam with said pendant forces the wedge 62 into engagement with the sides of an annular groove on the power-roller 65. This sets up friction between said wedge and groove and the pendant is rolled downwardly by the continuously-rotating power-roller.

The downward actuation of the pendant 61, through its connection with a main lever 64, actuates a bell-crank 72 to operate a typebar 73 away from the rest 75 and cause said type-bar to swing up and against the platen 74. Before the type-bar strikes the platen,

' it will assume the relative position shown by broken lines in Figure 1. In such position of, the type-bar, the cams 58 will have assumed the positions shown by Figure 2.

The last-mentioned position of the cams is due to their rotation by the downwardly traveling pendant, which rotation is insured by the knurling of the engaged surfaces. By such rotation one cam through its outwardly spiraled perimeter has swung the dependent arm 55 away from the pendant 61, and raised the pressure-lever 42 against the tension of the spring 46. The latch 41 has in the'meantime been moved up the face 37 of the stepping lever 34 until the seat 36 underlies and holds said latch through tension of the spring 38. The disk 53 serves to re-latch the pressure-lever 42.

'As the latch 41 becomes seated on the, stepping lever 34 an intersection of two cams will be in engagement with the pendant, and said intersection will lie on a dead-center line. The latter is indicated in Figure 2 by a broken line through the axes of the eccentric disk 53 and the power-roller 65. Through further rotation of said disk by the downwardly-moving pendant the latter will engage a following cam on the disk. Through the knurls on its inversely spiraled surface said following cam isrotated to gradually recede from, and sever engagement with, the knurled edge of said pendant.

When the last above-1nentioned disengagement has taken place, there will remain but bare clearance between the cam and pendant. It is still necessary for the pendant to swing slightly away from the groove before interfrictional relationship ceases. Such swing might r'e-engage the opposed knurling of the cam and pendant. -'The latter as it was raised by the spring 71 would then rotate said cam contra-arrowwise. The inverse spiral of the cam would then force the pendant into the groove and reestablish friction, and the pendant would again start down without having been restored to normal. This would cause unnecessary wearand strain on the cams, the pendant and the groove.

To obviate the last-mentioned disadvantages, and to insure release of the cams from the pendant, another means is embodied. On the eccentric disk are a multiplicity of pins 56 which extend laterally therefrom, and one of which is always in engagement with a spring-pressed detent 57 attached to or formed on a rotatable pawl-lever 50. Normally the detent abuts two pins, as shown by Figure 1. 'As the cams are rotated arrowwise the lower pin in said Figure 1 presses back and slides along the detent until said pin assumes the position shown in Figure 2.

As the cams are actuated arrowwise and over the aforementioned dead-center line, the detent through the spring 51 acts as a lever against said abutting pin, and moves the latter to still further rotate the cams. Such leverage ceases to move said pin as soon as the detent also abuts a following pm, as clearly illustrated by Figure 4. In such positions said pins maintain clearance between the cams and the pendant. The springpressure of the detents is not great enough to arrest the rotation of the cams.

In Figure 4 the pendant is free to be raised by the spring 71, which action restores the type-bars and connections to the computing mechanism. The key in the meantime 1s re-- leased and the spring 26 pulls the seat-39 to again underlie the latch 41. For ease in so acting, said seat 39 is in a lower plane than the seat 36- which still supports the latch. Before the releasing lever 22 comes to rest against the stop-bar 32, the stop-pin 33 w ll abut an arm of the stepping lever 34 and aca it engag tuate the seat 36 from beneath said latch.

The latter then drops onto and is held ready for release by said seat 39.

The restoration of the releasing lever through tension of the spring 26 will raise the depressed key to normal position when the finger is removed. This occurs through the link andbell-crank connecting the key. A cycle of operations having been completed, the parts will all again lie as shown in Figure 1. During such cycle, the latch 41 is always engaged by either the seats 36 and 39 or the faces 37 and 40, and never drops below the latter two. The latches maintain the stepping levers in operative relationship with each other, and the stepping levers maintain the latches. in operative relationship with the releasing levers.

After a key has been depressed, the side of the latch arrests the swing of the face 40, and prevents the key from rising until typing and computing actions have been automatically completed. A lingering pressure on the'keys 1 does not place a drag on said actions, nor are the latter affected by a second inadvertent pressure on the keys. This insures a cleancut imprint of the type upon a work-sheet, and also insures an errorless actuation of the computing mechanism.

In forming the curvature of the cams on the eccentric disks, a portion of the cams is made flat or very slightly spiraled. This flattened area is the one which first engages a pendant, which" upon such engagement, lies 1nert. en the cam is pressed rearward,

s the pendant in frictional relationship w1th the rotating power-roller. The

pendant is immediately propelled downwardly, and begins to rotate the cam against spring-tension. Owing to. said flattened area, more teeth on the cam and pendant will be in engagement when driving force begins than there would be on a sharper curved, camarea. The. greater number of teeth first in engagement prevents their jumping out when the cam is suddenly caused to rotate.

In preventing the jumping out of engaged teeth, the cam also functions to maintaln the frictional relationship between the pendant and the power-roller. Said flattened area therefore shows double advantages. It has still another, which becomes apparent after the intersection of two cams has passed the dead-center. In this case. said flattenedarea insures a quicker disengagement of its teeth with those of the pendant, to permit the latter to be more quickly restored through'springtension.

The eccentric disks, as -illustrated, have three perimetral cams, but it is not desired to limit this invention to that number. The cams, as drawn, have sufiicient'length to satisfactorily operate a combined ty ewriting and computing machine at the spec required foran average operator. Under such conditions, the actuated parts Wlll all be automatically restored between the successive release of any one key.

Some computing machines are constructed to simultaneously tabulate computations for a large number of separate columns on a work-sheet. This involves the concurrent movement of many parts, which means greater strains when the resultant heavier mass is moved from inertia. In using this invention it is advisable to minimize such strains by starting and continuing the movement of said heavier mass at a reduced speed.

To insure the aforementioned reduced speed, a longer time is required between the release and resetting of the keys. This is obtained by providing a longer travel for the cams which reset the keys, and by reducing the peripheral speed of the propellent powerroller. For such reduced speed the pendants are made longer and travel farther, and the bell-cranks 72 are so formed and connected to the main levers that, while the latter swing through a greater arc, the type-bars will still swing through the same arc, as shown in the drawings.

- To provlde a longer perimetral travel for any one cam, the periphery of the eccentric disks may be bisected to form'only two in- .shown.

In usin this invention on a typewriter solely, which is to be operated at very high speed, it is again advisable to alter the conformation of the eccentric disks. For such operation the actuating parts must be restored very quickly. This is accomplished through forming the eccentric disks tohave four or more cams. Each cam, by using the above-mentioned radius, would then be shorter than any one of the three, as illustrated, resulting in a shorter travel of the engaged pendant and necessitating a changed leverage for the bell-cranks 72. The changes. made and the results accomplished would then be the reverse of those where only two cams are used, as above described. 4 Through the construction shown and described, it is possible for the pressure-levers to be automatically reset or reseated. This reseating is accomplished by' direct engagement between the pressure-members and the releasing levers. No interponents are required between said members, and therefore the construction is simple. Having but few parts, the cost of manufacture is minimized; Also, with few parts to wear out and be replaced, an economical and long lived operation'is assured.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim: v

i 1. In a machine of the character described, a constantly-rotating power-roller, a typing mechanism, a key disconnected from said typing mechanism, 'a frictional pendantmember connected to the typing mechanism and connectible with the power-roller for actuation thereby, a spring-actuated pressure-lever engageable with the pendantmember, a lock for the pressure-lever arranged to be released by the key to establish operative connection between the friction pendant and the power-roller, and means mounted upon said pressure-lever, operable first to connect the pendant with the powerroller for actuation and-then to reset the pressure-lever to normal position, to be relocked independentl of the key.

2. In a machine 0 the character described, a constantly-rotating power-roller, a typing mechanism including a friction member arranged to be operatively connected with the power-roller for actuation thereby, a pres sure-lever, a spring for the pressure-lever, a lock for holding the pressure-lever against the tension of said spring, a key-operatedmechanism to release the pressure-lever from said look upon depression of the key, and a cam mounted on the pressure-lever to connect the friction member with the owerroller for actuation, said cam arrange to be rotated by the roller-driven friction member, and reset the pressure-lever to normal position, to be relocked by the key-mechamsm.

3. In a machine of the character described, a constantly-rotating power-roller, a typing mechanism including a friction member arranged to be operatively connected with the power-roller for actuation thereby, a pressure-lever, a spring for the pressure-lever, a lock for holding said ressure-lever' under the spring tension, a ey-operated mechanismto release the pressure-lever from its lock upon depression of the key, a cam mounted on the pressure-lever to connect the friction member with the power-roller for actuation, said cam arranged to be rotated by the actuated friction member, to reset the pressure-lever to normal position, to

be relocked by the key-mechan1sm, and a spring-actuated detent for the cam, operable to align and hold the cam in normal position.

4. 'In a machine of the character-described, a typing mechanism comprising a main lover, a constantly-rotating power-roller with fr e tion grooves, a friction pendant-member [PIV- oted to the main lever and having one edge the other edge corrugated to frictionally co-' operate with a pressure-member, a pressurelever, a pressure-cam with corrugations on its periphery to co-operate with the corrugated edgeof the pendant-member and having the two-fold function, to-press against the pendant-member and to oscillate the pressurelever, to thereb reset it to normal position in the course 0 an actuation, a spring connected to the pressure-lever tending to move the pressure-cam into engagement with the pendant, and a key-operated mechanism to release the pressure-lever to thereby engage the pressure-cam with the pendant and the pendant with the power-roller and induce actuation of the main lever and the typing devices connected thereto. I

5. In a machine of the character described, the combination of a universal power-driven friction roller, typing devices,, a friction member connected to the typing devices, keys Y disconnected from the typing devices, means mitted from the universal friction member to the typing devices.

6. In a machine of the class'described, the combination with a constantly-rotating power-roller, a typing'device, a lever for driving said typing device, a pendant mounted ppon said typing-device-driving lever and engageable with the rotating roller, a key separated from the pendant, and a tensioned pres sure-lever engageable with the pendant but held inoperative thereto, the pressure-leverholding means including a latch operable by. the key tp release the pressure-lever, of a cam rotatably mounted upon the pressure-lever and brought into engagement with the pendant, when said pressure-lever is released by the key, to establish a pendant-driving friction with the roller and then be rotated by the roller-driven pendant to restore the pressure-lever to the control of the holding latch independently of the key. v

7. In a machine of the class described, the combination with a constantly-rotating power-roller, a typin device, a lever for driving said typing evice, a pendant mounted upon said typing-device-driving lever and engageable with the rotating roller, a key sepa rated from the pendant, and a tensioned pressure-lever engageable with the pendant but heldinoperative thereto, the pressure-leverholding means includinga latch operable by .the key to release. the pressure=lever, of a cam rotatably mounted'upon the pressurelever and brought into engagement with the pendant, whensaid pressure-lever is released.

'upon said typmg-device-driving lever and engageable with the rotating roller, a' key separated from the pendant, and a tensioned pressure-lever engageable with the pendant but held inoperative thereto, the pressurelever-holding means including a latchoperable by the key to release the pressure-lever, of a cam rotatably mounted upon the pressure-lever and brought into engagement with the pendant, when said pressure-lever is reroller.

leased by the key, to establish a pendant-driving friction with the roller, said cam having characteristics operable when rotated by the roller-driven pendant to rock said key-released pressure-lever, to progressively in-.

crease the pendant-driving friction .with the 9. In a machine of the class described, the combination with a constantly-rotating power-roller, a typing device, a lever for driving said typing device, a pendant mounted upon said typing-device-driving lever and en- 1 gageable with the rotating roller, a key separated-from the pendant, and a tensioned pressure-lever engageable with the pendant but held inoperative thereto, the pressure-- lever-holdin means including a latch operable by the key to release the pressure-lever, of a cam rotatably mounted upon the pressure-lever and brought into engagement with the pendant, when said pressure-lever is released by'the key, to establish a pendant-driving friction with the roller, said cam having characteristics operable when rotated by the roller-driven pendant, to restore the key-released pressure-lever to the control of its holding latch and automatically release the pendant'from the control of the powerT-roller during the pendant-rotation of the cain..

10. In a machine of the class described, the combinationwith a constantly-rotating power roller, a typing device,- a lever for driving said typing device, a pendant mounted upon said typing-device-driving lever and engageable with the rotating roller, a key separated from the pendant, and a tensioned pressurelever engageable with the pendant but held inoperativ thereto, the pressure-lever-hold ing means including a latch operable by the key to release the pressure-lever, of a cam rotatably mounted upon the pressure-lever and brought into engagement; with the pendant, when said pressure-lever is released by the key, to establish a pendant-driving friction with the roller, said cam having characteristics operable when rotated means mounted upon the pressure-lever and engageable with means on the cam to rotate the cam to a normal position after its rotation b the roller-driven pendant.

11. n a machine of the class described, the combination with a constantly-rotatindg power-roller, a typing device, a lever for riving said typing device, a pendant mounted upon said typing-device-drivin lever and engageable with the rotating rolIer, a key separated from the pendant, and a tensioned pressurelever. engageable with the pendant but held inoperatlve thereto, the pressure-lever-holding means including a latch operable by the key to release the pressure-lever, of a cam rotatably mounted upon the pressure-lever and brought into engagement with the pendant, when said pressure-lever is released by the key, to establish a pendant-driving friction with the roller, said cam having characteristics operable when rotated by the roller-driven pendant, to restore the key-released pressure-lever to the control of its holding latch and automatically release the pendant from the controlof the power-roller during the pendant-rotation of the cam, and detenting means engageable with the cam, including a lever mounted upon the pressure-lever and operable to complete the rotation of the cam to a normal position after the rollerfor a typing-device-driving reciprocation,

each train of mechanism including a pressurelever, a spring to tension said pressure-lever, a latch-lever for holding said pressure-lever at a tensioned position, a connection between the latch-lever and a key, and a re-latching disk rotatably mounted on the pressure-lever and engageable with the pendant.

13. In a machine of the class described, the combination of typing devices, levers for, driving the typing devices, pendants on said levers, a power-driven roller withiwhich said pendants are frictionally engageable, keys separated from the typing-device-driving levers, and a train of mechanism intermediate each key and each pendant operable when a driven pendant has ceased to rotate the cam.

key is depressed to shift said pendant into frictional engagement with the power-roller for a typing-device-driving reciprocation, each train of mechanism including a. pressure-lever, a spring to tension said pressurelever, a latch-lever for holding said pressure-lever at a tensioned position, a connection between the latch-lever and a key, a disk rotatably mounted on said pressure-lever, and a plurality of duplicate perimetral cams formed on said disk, each cam engageable in turnwith the peridant and each cam rotated by the rollerdriven pendant to determine the extent of reciprocation for the pendant by the roller.

14. In a machine of the class described, the combination of typing devices, levers for driving the typing devices, pendants on said levers, a pewer-drlven roller with which said pendants are frictionally engageable, keys separated from the typing-device-driving levers, and a train of mechanism intermediate each key and each pendant operable when a key is epressed to shift said pendant into frictional engagement with the power-roller for a typing-device-driving reciprocation, each train of mechanism including a pressurelever, a spring to tension said'pressure-lever, a latch-lever for holding said pressure-lever at a tensioned position, a connection between the latch-lever and a key, a disk rotatably,

mounted on said pressure-lever, a plurality of duplicate perimetral cams on said "disk, each.

cam engageable in turn with the pendant to be rotated by the roller-driven pendant, and a detenting means on said pressure-lever engageable with the disk to set each cam at a normal position after its pendant-driven rotation. A

15. In a machine of the class described, the combination of typin devices, levers for driving the typing devices, pendants on said levers, a power-drivemroller with which said pendants are frictionally engageable, keys separated from the typing-device-driving levers, and a train of mechanism intermediate .each key and each pendant operable when a key is depressed to shift said pendant into frictional engagement with the power -roller for a typing-device-driving reciprocation, each train of mechanism including a pressurelever, a spring to tension said pressure-lever,

a latch-'lever for holding-said pressure-lever at a tensioned position, a connection between the latch-lever and a key, a disk pivotally mounted upon said pressure-lever to be rocked therewith, and a plurality of perimetral cams on said disk, each cam engageable one after the other to be rotated: by the roller-driven pendant and each cam'operable when rotated by the pendant to rock the pressure-lever and increase the key-released tension of said combination of typin devices, levers for levers, a power-driven roller with which said pendants are frictionally engageable, keys separated from the typing-device-driving levers, and a train of mechanism intermediate each key and each pendant operable when a key is depressed to shift said pendant into frictional enga ement with the power-roller for a typing-device-driving reciprocation, each train of mechanism including a pressurelever, a spring to tension said pressure-lever, a latch-lever for holding said pressure-lever at a tensioned position, a connection between the latch-lever and a key, a disk pivotally mounted upon said pressure-lever to be rocked therewith, and a plurality of perimetral cams on said disk, each cam engageable one after the other to be rotated by the roller-driven pend-ant and each cam operable when rotated by the pendant to rock the pressure-lever against its tension to be re-engaged at its normal position by said latch-lever, said latchlever having a stepping lever to latch the camrestored pressure-lever until said latch-lever is restored to latching position by the release of the key.

17. In a machine of the class described, the combination with a constantly-rotating power-roller, a typing device, a lever for driving said typingdevice, a pendant mounted upon said driving lever, a key disconnected from said pendant, a tensioned ressurelever, and a latch normally contro ing said lever against its tension and having a con.- nection with the key whereby said lever is released to its tension when the key is de- I released tension of the pressure-lever against the pendant to establish a pendant-driving friction-with the roller to drive the typingdevice-driving lever, said means including a disk rotatably mounted upon the pressurelever and having perimetral cams, both the pendant and the cams having teeth that interlook under the key-released pressure-lever tension, so that the disk will be rotated by the roller-driven pendant, and each cam will operate to restore the pressure-lever to the control of its latch independently of the release of the key. I

18. In a machine of the class described, the combination with a constantly-rotating power-roller, a typing device, a lever for driving said typing device, a pendant mounted upon said driving lever, a key disconnected from said pendant, a tensioned pressurelever, and a latch normally controlling said lever against its tension and having a conv pressed, of means operable to convey the key-.

released tension" of the pressure-lever against the pendant-to establish "a pendant-driving friction with the roller to drive the typingdevice-driving lever, said means including a disk rotatably mounted upon the pressurelever; and having perimetral cams, both the pendant and the cams having teeth that interv lever-holding look under the key-released pressure-lever tension, so that the disk will be rotated by the roller-driven pendant, each cam having a straight toothed section with many interlocking teeth for the initial engagement with the pendant for the initial lifting of the typing device from a state of rest, and an eccentric toothed section subsequently engageable with the endant to accelerate the motion of the lifte typing device by rocking the keyreleased pressure-lever'and progressively increasing the driving friction for the pendant against the roller.

19. In a machine of the class described, the combination with a constantly-rotating roller, a typing device; a lever for driving said typing device, a pendant mounted on said typing-device-driving lever and engageable with the rotating roller, a key disconnected from said pendant, and a tensioned pressure-lever engageable with the pendant but held inoperative thereto, said pressure= ated by the ey to release the ressure-lever when the key is depressed, 0 means rotatively mounted upon the pressure-lever and brought into engagement with the pendant when said pressure-lever is released by-the key, to establish a pendant-driving friction with the power-roller that automatically increases as the throw of the roller-driven pendant progressively rotates said means.

RICHARD VON REPPERT.

means including a latch oper-

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