US1294622A

US1294622A - Type-writing machine.

Info

Publication number: US1294622A
Application number: US80159313A
Authority: US
Inventors: Cornelius B Corcoran
Original assignee: Underwood Typewriter Co
Current assignee: Underwood Typewriter Co
Priority date: 1913-11-18
Filing date: 1913-11-18
Publication date: 1919-02-18
Anticipated expiration: 1936-02-18

Description

C. B. CORCORAN.

TYPE WRITING MACHINE.

APPLICATION FILED NOV. 18. I913.

1,294,622. Patented Feb. 18, 1919.

. 2 SHEETS-SHEET 1. 13 0Z9 ,m 14 Z9 72 mm 4 L C. B. CORCORAN.

TYPE WRITING MACHINE.

APPLICATION FILED NOV. 18. 1913.

1,294,622. Patented Feb. 18, 1919.

2 SHEETSSHEET 2.

" and the shifting lever.

CORNELIUSEB. CORCORAN, OF NEW YORK, N. Y., ASSIGNOR TO UNDERWOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPE-WRITIN G MACHINE.

Specification of Letters Patent.

Patented Feb. 15, 1919.

To all whom it may concern Be it known that I, CORNELIUS B. Con CORAN, a citizen of the United States, residing in borough of Bronx, in the county ofNew York, city and State of New York, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is a specification.

My invention relates to line-spacing mechanism for typewriting machines. The usual reciprocating pawl and ratchet line-spacing mechanism enables the operator to space the lines apart a set distance or a multiple thereof.

An object of the present invention is to provide means for spacing the lines a greater number of diiferent distances within a given range than are obtainable with,the usual mechanism employing a single ratchet or means for feeding the platen step-by-step through predetermined distances. The invention thus provides for a greater refine.- ment of adjustment, at the same time obtaining a positive and definite spacing operation, and maintaining other advantages of the pawl and ratchet mechanism. The invention is also of advantage in securing fractional line-spacing.

The invention when applied to a revoluble platen may comprise a plurality of ratchets connected to rotate with the platen, the teeth on the two ratchets being differently spaced, to effect line-space rotations of the platen through different distances. A pawl for rotating the platen is shifta'ble selectively into cooperative relation to either ratchet, as by means of a shifting lever which may also be utilized to alternatively lift spring-pressed detents out of contact with the ratchets. For the latter purpose the shifting lever may be formed with a cam to control the with which the pawl is in position to co operate, is in contact with its ratchet, and the other detent is held in inoperative position, and vice versa. To permit the pawl to be shifted into alinement with either ratchet, it may be slidably mounted on a pivot pincarried by the usual lever-operated slide bar, and shifted on said pin by any suitable connection between the pawl AJ line-space adjuster maintains an operative relation to the pawl while the latter is in position to cooperate with either ratchet, and is adjustable to control the number of line-space distances through which either ratchet is rotated.

Other features and advantages will here inafter appear.

In the accompanying drawings,

Figure 1 is a part sectional perspective viewof the invention as applied to an Underwood typewriting machine, the parts being at an intermediate position assumed during a line-spacing operation.

Fig. 2 is a similar view, but with the shifting lever reversed. a

Fig. 3 is a View similar to Fig. 1, but wit the actuatingpawl at the limit of its driving stroke;

Fig. 4 is a sectional elevation view with the parts in their normalposition of rest.

Fig. 5 is a detail view of a line-space adjuster.

Fig. 6 is a rear perspective view of mechanism shown in Fig. L.

Fig. 7 is a view similar to Fig. 6, but with the shifting lever reversed, and certain parts of the mechanism omitted.

Fig. 8 is a detail plan view showing the shifting lever in one position.

Fig. 9 is a similar view with the shifting lever in the reverse position.

In accordance with the present invention, the line-space movements of the platen may be controlled by either one of a plurality of ratchetshaving differently spaced teeth, and by the term ratchets as used in the claims is meant the'usual toothed wheel or equivalent means for advancing the platen step-by-step. In the adaptation of the invention to a revoluble platen, line-space ratchet wheels 1 .of the other wheel. The size or spacing of the teeth on'the two ratchets may bear any desired relation. As shown, the teeth of the outer wheel 2 are substantially smaller than those on the inner wheel 1, although this relation may be reversed, if desired. An actuating pawl or dog 5 to drive the racks 1 and 2 is ivoted on a pin 6 on a slide bar or plunger slidably mounted on the carriage frame 8 in which the platen axle 3 is journaled.

The slide bar 7 is moved rearwardly to effect. a line-space rotation of the platen by means of a line-space lever 9 (Fig. 4) having an arm 10 to engage the sllde bar 7 and move it rearwardly when the lever 9 is moved to the right. The slide bar 7, pawl 5 and lever 9 are returned to initial position by a returning spring 11 connected at one end to the slide bar and at the other end to a pin 12 on the platen frame. The pawl 5 has a laterally projecting tooth 13 adapted to cooperate with either ratchet wheel, depending upon the position of the pawl. The pawl is slidable laterally on its pivot pin 6 from its inner position, shown for example in Figs. 6 and 8, in which it cooperates with the inner wheel 1, to the position indicated in Figs. 1, 3 and 9, in which the tooth 13 is adapted to engage the ratchet wheel 2. The pawl is shifted by means of a shifting lever 14 connected by a pivot pin 15 intermediate its ends to the platen frame, and having at its forward end an operating handle 16.

Projecting downwardly from the lever 14 is a pair of pins 17 the lower ends of which straddle a projection 18 on the pawl 5, so'

that as the lever is shifted the pawl is carried bodily along its pivot pin 6. By means of the projection or rib 18 and the pins 17, the pawl is guided or maintained in engagement with the selected wheel during the driving of the pawl by the lever 9. The ins 17 also engage humps formed on a hold- 1ng spring19 to normally retain the shifting lever in elther of its shifted positions.

Detent levers-20 and 21 carry detent rollers 22 cooperating with the ratchets 1 and. 2 respectively, and are yieldingly held against the ratchet wheels by springs 23. These levers are mounted on a pivot 24 which may be a shouldered screw mounted in the platen frame, and the detentlevers may be spaced apart and positioned by collars 25 on said screw. I he detent levers are alternately shifted into operative position so that only the active ratchet wheel, that is, the one with which the pawl 5 is in cooperative relation, is controlled by the detent, the other detent being held free from its ratchet to prevent interference, The advantage of havin individual detents for the ratchet whee s is that each may position its wheel without reference to the other wheel, and thereby pre-. sent the teeth properly to the drive pawl 5. For this purpose, one detent arm may vary a trifle in length from the other, as at Fig. 4. The shifting lever 14 which controls the pawl 5 may also conveniently be em loyed to shift the detent levers, and for this purpose is provided with a cam slot or opening 26 into which project the upper ends of the detent levers 20 and 21. Said levers may be provided with anti-friction rollers 20 and wardly and rearwardly by an adjusting le- 21 respectively, which bear against inclined faces orcams 27 oij the'slot 26. When the handle 16 of the shifting lever 14 is moved inwardly, as shown in Flg. 8, the upper end of the inner detent lever 20 is permitted to move rearwardly sufliciently to bring its roller 22 against the inner ratchet wheel 1, but the detent lever 21'has its upper end cammed forward by the surface 27 to hold, its .detent out of engagement with the wheel 2, as shown in Fig. 6. \Vhen the shifting lever 14 is reversed to the Fig. 9 position, the inner detent lever is cammed away from its ratchet wheel, and the outer lever 21 is permitted to swing its detent into engagement with the ratchet Wheel 2. The detents serve the usual function of holding the ratchet wheels and the platen at definite line-space positions.' I The distance the platen is rotated at each operation of the line-space lever is controlled by a line-space adjuster, which is common to both line-space wheels, that is, controls the amplitude of rotation of the platen, whether the pawl cooperates with the inner or the outer line-space wheel. The line-space adjuster (see Fig. 5) comprises a horizontally disposed arm 28 adjustable forver 29 journaled on the platen axle 3 and having a slot-'and-pin connection 30 with the arm 28. Sand arm is slidably supported at its rear end on the pivot pin 24,. which extends through a horizontal slot 31 in said The forward end of the arm 28 has a lateral extension 32 in the form of a horizontal plate or ledge, which forms a support for the pawl 5 and holds the pawl off from the ratchet wheel during the initial portion of its throw. That is, when the pawl commences its rearward movement it is held up until the tooth 13 passes beyond the ledge 32 when said tooth moves downwardly to engage the ratchet wheel, and rotates the latter through one or more linespace distances, depending on the adjustment of the arm 28, the position of the lat- "ter determining which tooth of the ratchet wheel is engaged by the pawl. The arm 28 is held in definite positions of adjustment by a spring detent arm 33 which may be secured to the pin 24, and is provided with a boss 34 to engage recesses ,or openings .35

in the arm 28. The ledge 32 on the arm 28 preferably extends laterally a suflicient distance to cooperate with the pawl when the latter is in operative relation to the wheel 2, as well as when moved inwardly or to the ri ht to cooperate with the wheel 1.

11 order to make such compensation as may be necessary or suitable for the difference in the pitch of the teeth ,on the ratchets, the outer end of the ledge 32 may be of a less width than the inner end, to 180 permit the pawl to drop at a different point in its travel when set to-engage the Wheel justed relatively to their respective ratchet wheels, that when a ratchet wheel has been moved to a line-space position by the pawl 5 being brought against the stop 36, the de tent roller 22 for said wheelwill be squarely seated between two of the ratchet teeth, and thus prevent any movement of the platen when the pawl is withdrawn. The two ratchet wheels are preferably relatively adjusted so that their teeth are alined at one point at least in the periphery of the wheels. In Fig. 2 the tooth 13 of the pawl is shown in engagement with the ratchet wheel 1 at such point, that is, the pawl tooth 13 engages a tooth 37 of the wheel 1, which is in line with a tooth 37 on thewheel 2. If the pawl 5 while in contact with the tooth 37 be moved from the Fig. 2 position to the limit of its rearward movement, that is, in engagement with the stop 36, both the detent rollers 22. will be in position-to seat squarely between teeth of the respective ratchet wheels. That is, the inner detent 20 willlbe seated against the wheel. 1, but if the shifting lever 14 were reversed, the detent 21 would accurately seat against the wheel 2 without any movement of the platen.- At other positions to which the platen might be rotated by the line-space pawl, the reversal of the shifting lever might result in a slight rotation of the platen, to permit a proper seating of the detent.

The lever 14 may be provided on its upper face with figures or other characters 38 which are visible through a slot 39 in a cover plate 40 of the platen frameto indicate the position of the line-space adjuster 29, the figures indicating the number of line-space distances through which the platen will be rotated for a corresponding adjustment of the lever 29. The lever 14 may be provided, as shown, with two sets of figures 38 which are respectively brought into view beneath the opening 39 when the lever is shifted, and the number of figures in. the two sets may be diflerent for the two ratchet wheels. For instance, 1 when the pawl is set to drive the inner ratchet wheel. only two operative adjustments of the .linespace'. a djuster may be ermitted, indicated by the two figures 1, 2 w ich appear beneaththe-opening 39 (Fig. 8). Likewise, three operative adjustments are permitted when the pawl is shifted to drive the outer wheel, as indicated by the index figures 1, 2, 3 at the opening 39 (Fig. 9).

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; i

1. In line-space mechanism, the combination with a rotary platen, of ratchet wheels connected to rotate therewith and each provided with uniformly spaced ratchet teeth, the teeth of one wheel being spaced at different angular distances from those of the other, means to selectively drive said wheels to rotate the platen, a holding detent for each wheel arranged to hold it at the positions to which it is brou ht by said driving means, and means to hold each detent off its wheel while the other wheel is being driven.

2. In a line-space mechanism, the combination with a rotary platen, of ratchet wheels connected to rotate therewith, and

each provided with uniformly spaced ratchet teeth, the teeth of one wheel being spaced at difierent angular distances from those of the other, and the number of teeth of one ratchet wheel. being primed with respect to the number of teeth of the other ratchet wheel, an actuating pawl shiftable into cooperative relation with either ratchet wheel singly, a pawl-shifting device, and detents individual to each ratchet-wheel and each movable radially of its corresponding wheel,

said-detents set by said pawl-shifting device wheel and into position to cooperate with the other wheel, a line-space lever to actuate said pawl when in cooperative relation to either ratchet wheel, and detents to hold the ratchet wheels, said pawl-shifting device operable to hold each detent disengaged from its wheel while the pawl is in cooperative relation to the other wheel.

4. In line-space mechanism, the combination with a rotary platen, of ratchet wheels connected to rotate therewith and each provided with uniformly spaced ratchet teeth, the teeth of one wheel being spaced at different angular distances from those of the other, an actuating pawl, a deviceto shift sald pawl from position tocotiperate with one wheel into position to cooperate with the other wheel, a line-space lever to actuate said pawl when in position to cotiperate with either ratchet wheel, spring detents to engage the ratchet wheels, and means to shift the detents into and out of operative position.

5, In line-space mechanism, the combination with a platen, of line-space ratchet wheels connected to rotate with the platen, means to drive either of said wheels to rotate the platen, spring actuated detents for said wheels, and means to automatically permit a detent to engage the driven wheel and to hold off the detent from the other wheel.

6. In line-space mechanism, the combination with a rotary platen, of ratchetwheels connected to rotate therewith, ;means to drive either of said wheels to rotate the platen, and detent-holding devices individual to said wheels and each set to hold its wheel at the positions to which it is brought by said driving means, each detent-holding device automatically maintained in engagement with its wheel while the latter is in use and out of engagement with the other wheel.

7. In line-space mechanism, the combination with a frame or paper-carriage, of a platen axle and a platen mounted thereon, ratchet wheels fixed to the axle, a pawl shiftable in a direction parallel with the platen axle into positions to cooperate with either ratchet wheel, a pawl-carrier on the carriage and on which the pawl is mounted, a line-space lever mounted on the carriage and arranged to drive said carrier and pawl in a direction transverse to the platen axle to rotate the platen, and a shifter mounted on the carriage to shift said pawl and guide orcontrol the pawl as the latter is driven by said line-space lever.

' 8. In line space mechanism, the combination with a platen axle and a platen mounted thereon, of ratchet wheels fixed to the axle, a pawl shiftable in a direction parallel with the platen axle into positions to 006perate with either ratchet wheel, a shiftable lever for shifting said pawl, means to hold said lever in either position to which it is shifted, and means to actuate the pawl and thereby rotate the platen.

9. In line-spacing mechanism, the combination with a rotary platen, of ratchet wheels connected to rotate therewith, a pawl shiftable into cooperative relation with either ratchet wheel, detents cooperating with the ratchet wheels'respectively and shiftable into and out of cooperation therewith, and a shifting device fol-shifting the detents and simultaneously shifting the pawl.

10. In line-spacing mechanism, the combination with a rotary platen, of ratchet wheels connected to rotate therewith, a pawl Qt shiftablefrom position to engage one of said wheels into position to engage the other wheel, detents each adapted to move into and out of engagement with one of said wheels, and a shifting lever adapted to shift said pawl and move said detents.

11. In line-spacing mechanism, the combination of a rotary platen, line-Space wheels connected to rotate therewith, spring-actuated detents, one adapted to move into and out of engagement with each ratchet wheel, and a shifting device to permit one detentto engage its ratchet wheel and simultaneously disengage the other detent from its ratchet wheel.

12. The combination of a rotary platen, line-space wheels connected to rotate therewith, spring-actuated detent levers carrying detents to engage the respective ratchet wheels, and a shifting lever engaging the detent levers and operable to disengage one detent from its wheel and simultaneously permit an engagement of the other detent with its wheel.

13. In line-spacing mechanism, the combination with a rotary platen, of line-space wheels connected to rotate therewith, detent levers mounted on a common pivot and carrymg detent rollers movable into engagement with the respective wheels, springs to hold the detents against their wheels, and a shifting lever having a cam to actuate the detent levers and operable to lift either detent roller from its wheel and simultaneously permit the other roller to engage its wheel.

14. In line-spacing mechanism, the combination with a rotary platen, of line-space ratchet wheels connected to rotate therewith, the teeth on one wheel being finer than those on the other wheel, actuating means arranged to be brought into operative relation to either of said wheels for selectively engaging and rotating said wheels, and a single line-space regulating device operative to control said actuating means while in operative relation'to either wheel and adjustable to cause either ratchet wheel to be rotated through a greater or less angle when engaged by said actuating means, said angle determined by the adjustment of said regulating device; said regulating device including provision for making suitable compensa tion for the difference in the spacing of the teeth on the ratchet wheels.

15. In line-spacing mechanism, the combination with a carriage and a rotary platen thereon, of line-space wheels connected to rotate with the platen, said wheels being of substantially the same diameter and each formed with a series of ratchet teeth on its periphery, the teeth on one wheel being spaced at smaller angular distances than those of the other wheel, a pawl on the carriage' and shiftable in the direction of the platen axis into alinement with either wheel,

and a line-space lever having a stationary.

mounting on the. carriage and arranged to actuate said pawl when in either of said positions.

16. The combination with a rotatable platen, of line-space wheels connected to rotate;v therewith, a line-spacing lever, means I wheel to indicate positions of adjustment for said adjusting device to determine the number of line-space rotations through which the platen will be rotated by an operation of the line-space lever through 'either wheel, and means to automatically present to view the index for the wheel with which the linespace lever is in driving relation, and hide from view the other index.

17. The combination with a rotatable.

shifting lever for shifting the driving con-' nection fromone wheel to the other, an adjusting device to determine the number of line-space distances through which the platen will-be rotated by an operation of the line-spacing lever through either wheel,v

and an index for each wheel toindicate positions of adjustment for said adjusting device, said shifting lever provided with a sight opening to automatically expose to view the index corresponding to the'wheel with which the line-spacing lever is in driving connection, the index for the other wheel being hidden 'from View by said lever.

18. In a typewriting machine, the combination with'a revoluble platen, of line-space ratchet wheels secured side by side to the platen axle, said wheels being of substantially the same diameter, the teeth of one wheel being finer or at smaller angular intervals than those of the other wheel, a pawl carrier movable transversely to the platen axle, a line-spacing lever for moving said carrier, and a pawl pivotally mounted-on said carrier and shiftable on its pivot into positions to drive either line-space wheel singly platen axle, said wheels being of substan tially the same diameter, the teeth of one wheel being at smaller angular intervals til than those of the other wheel, a pawl carrier movable transversely to the platen axle, a line-spacinglever for moving said carrier, a pawl pivotally mounted on said carrier and shiftable on its pivot into positions to drive either line-space wheel singly when the line-spacing lever is operated, a ledge to hold the pawl off the line-space wheel during a portion of the line-spacing movement of the pawl, and an adjusting device to shift said ledge and thereby vary the point at which the pawl engages the ratchet wheel to regulate the extent of rotation of the platen, said ledge extending into position to control the pawl while the latter is in operative relation to either wheel.

20. In line-spacing mechanism, the combination of a rotary platen, ratchets for rotating the platen, a pawl shiftable to bring it into operative relation to either ratchet, means to actuate the pawl to drive the corresponding ratchet, and detent-holding devices individual to said ratchets and each arranged to engage and hold its ratchet, when the latter is in use, at the position to which it is moved by the pawl, while the other ratchet is free from the influence of its detent-holding device. 7

21. In line-spacing mechanism, the com bination of a rotary platen, ratchets con nected to rotate therewith, means to drive either ratchet while the other ratchet is carried idly with. the platen, the teeth of one ratchet being differently spaced from those of the other ratchet, and the number of teeth of one ratchet being primed with respect to the number of teeth of the other ratchet, whereby the platen is rotated through greater distances when operated through one ratchet than through the other, holding detents, one for each ratchet, and means to cause each detent to engage its ratchet when the latter is in use and hold the platenat the position to which'it is rotated by the driving means, and to free the other'ratchet from the influence of its holding detent.

22. In line-spacing mechanism, the combination with a revol-uble platen, of ratchets connected to rotate with the platen, a driving pawl, selective means for causing the pawl to drive either ratchet, detent-holding devices individual to the ratchets, and means to cause each holding device to engage its ratchet when the latter is in use and hold it free from its ratchet when the other-ratchet is in use.

23. In line-spacing mechanism, the combination with a platen, of means to advance it step by step for line-spacing the work, said means comprising ratchets having the teeth of one ratchet spaceddiflerently from the. teeth of the other ratchet, driving means to engage either ratchet and advance the said ratchet, while the other ratchet is free from said driving means, stopping means to limit the throw of the driving means, and

line-space regulating means for cooperation with the ratchets selectively, whereby the line-spacing movements of the platen may said throw and permitting it to move into engagement with its ratchet during said throw,

the controlling means bein individualto each ratchet to correspond with the position I of the teeth on said ratchet.

25. In line-spacin mechanism, the combination with a revo uble platen, of ratchets connected to rotate therewith and having the teeth of one ratchet difi'erent-ly spaced from those of the other, a pawl to drive the ratchets and shiftable into cooperative rela tion to either ratchet, and controlling means to holdthe pawl ofl the ratchets during the initial portion of its driving movement, said controlling means formed to permit the pawl to engage one ratchet at a different point during the advance of the pawl than that at which it engages the other ratchet, the point of engagement for each ratchet being timed by said controlling means to correspond with the spacing of the ratchet teeth and the positionlto which the ratchet is brought by the paw i 26. In line-spacing mechanism, the combi-- nation with a revoluble platen, of ratchets connected to rotate therewith and having the teeth of one ratchet difi'ercntly spaced from those of the other ratchet, a driving pawl, a slide on which the pawl is shiftably mounted for movement into cooperative relation to either ratchet, a line-space lever to drive said slide, and a ledge to hold the pawl oil? the ratchets during the initial movement of the slide and permittin the pawl to move into engagement with elther ratchet at a point corresponding to the position and spacing" of the ratchet teeth with which the pawl is in 006 erative relation.

2 In line-spacing mechanism, the combination with a revoluble platen, of ratchets connected to rotate therewith and hat-in the teeth of one ratchet difl'erently spaced Irom those of the other ratchet, a driving pawl, a slide on which the pawl is shiftably mounted for movement into cooperative relation to either ratchet, a line-space lever to drive said slide, a ledge to hold. the pawl oif the ratchets during the initial movement of the slide and permittin the pawl to move into engagement with elther ratchet at a point corresponding to the position and spacing of the ratchet teeth with which the pawl is in cooperative .relation, a stop to limit the throw of the pawl, detents individual to the ratchets for holding the ratchets at predetermined positions, and a switch operative to shift the driving paw]. and concomitantly bring into use the detent for the active ratchet.

28. In line-spacing mechanism, the combination with a revoluble platen, of ratchets connected to rotate therewith and having the teeth of one ratchet differently spaced from those of the other ratchet, a driving pawl, a slide on which the pawl is shiftably mounted for movement into cooperative relation to either ratchet, a line-space lever to drive said slide, a ledge to hold the pawl oil the ratchets during the initial movement of the slide and Permitting the pawl to move into engagement with either ratchet at a point corresponding to the position and spacing of the ratchet teeth with which the pawl is in cooperative relation, stopping means to limit the throw of the pawl, detents individual to the ratchets, said detents each adjusted to hold its ratchet at the position to which it is brought by the driving pawl. and means to ,hold each detent free from its ratchet while the other detent is in use.

I 29. In line-spacing mechanism, the combination with a revoluble platen. of ratchets connected to rotate therewith and having the teeth of one ratchet differently spaced from those of the other ratchet, a driving paw], a slide on which the pawl is shiftablv mounted for movement into cooperative relation to either ratchet, a line-space lever to drive said slide, a ledge to hold the pawl off the ratchets during the initial movement of the slide and permitting the pawl to move into engagement with either ratchet at a point corresponding to the position and spacing of the ratchet teeth with which the pawl is. in cooperative relation, stopping means to limit the throw of the pawl, detents individual to the ratchets, said detents each ad- ]usted to holdits ratchet at the position to which it is brought by the driving pawl. and a switch for shifting the pawl into operative relation to either ratchet and concomitantlv sh fting the corresponding detent into operative position and. withdrawing the other detent.

30. In line-spacing mechanism, the combination with a revoluble platen, of ratchets connected to rotate therewith and having the teeth of one ratchet differently spaced from those of the other ratchet, a driving pawl, a

slide on which the pawl is shiftably mountis at an intermediate position, and meansto shift said ledge to diflerent operative positions and thereby vary the number ofsingle line-space distances through which the platen may be rotated at a single operation of the linespace lever when eitherratchet is in use.

.31. In line-spacing mechanism, the combination with a carriage and a revoluble platen thereon, of line-spacing ratchets, a driving pawl, a slide onwhich the pawl is pivotally mounted, said pawl shiftable on its pivot in a direction lengthwise ofthe platen to bring the pawl into register with either ratchet, and a line-spacing lever on the carriage to actuate said slide.

32. In line-spacing mechanism, the combination with a revolubleplaten, of line-Spacing ratchets therefor, a driving pawl, a slide on which the pawl vis pivotally mounted, said pawl shiftable on its pivot in a direc tionlengthwise' of the platen tobring the pawl into register with either ratchet. a linespacing lever to actuate said slide, a ledge arranged to hold the pawl off the ratchets during the initial portion of'its throw. and means for adjusting the ledge to vary the point at which, during the throw of the pawl, it is permitted to engage its ratchet,

whereby the number of line-space distances through which the platen may be rotated when' either ratchet is in use, may be regulated.

33. In line-spacing mechanism, the combination with a revoluble platen, of line-spacing ratchets therefor, a driving pawl, a slide on which the pawl is pivotally mounted. said pawl shiftable on its pivot in a direction lengthwiseof the platen to bring the pawl into register with either ratchet, a line-spacing lever to actuate said slide, a ledge arranged to hold the pawl off the rutchets during'the initial portion of its throw, means for adjusting the ledge to vary the point at which, during the throw of the pawl, it is permitted to engage ratchet, whereby the number of line-space distances ,through which the platen may be rotated when either ratchet is in use, maybe regulated, detents individual to the ratchets, and means, forming an operative connection between the detents and pawl, for causing each detent to be lifted-from its ratchet concomitantlv with h Shifti f the paWl into registerwith the other ratchet.

34. In line-spacing. mechanism, the combination with a revoluble platen, of line-spacing ratchets therefor, a'driving pawl, a slide on which'thepawl is pivotally mounted, said pawl shiftable on its pivot in a direction lengthwise of the platen to bring the pawl into register with either ratchet, a line-spacing lever to actuate said slide, detents individual to the ratchets, a switch, and means operated by the switch to shift the pawl, and

to simultaneously lift from its ratchet one detent and permit the other detent to engage the ratchet'with which the pawl brought into register.

35. In line-s'pacingmechanism, the combination with a platen, of driving means therefor, devices to transmit motion from the driving means to line-space the platen, the line-space distances when one of said devices is in use being'diflerential to those when the other device is in use, means whereby said devices may be selectively brought into use, adjusting mechanismfor varying the number of line-spaces through which the platen is driven when either of said devices is in use, indices individual to said devices to indicate the number of line-spaces for whlch said ad uSting mechanism is set, and

means to automatically expose to view each index when the corresponding motion-transmitting dev1ce 1s.1n use, and to hide from view the other 'index.

tive relation to one wheel and into position to cooperate with the other. wheel, means to actuate said pawl, and line-space regulat ng means for coiiperationwith the ratchet wheels, whereby the line-spacing movements of the platen may be predetermined when either ratchet is in use, said regulating means having provision for making suitable a device to shift said pawl out of cooperacompensation for the difi'erence in the spac-.

ing of the teeth on the. ratchet wheels.

37 In line-spacing mechanism, the combr nation with a rotary platen, of line-space ratchet wheels connected to rotate therewith, an actuating pawl shlftable into cooperative relation with either wheel, and a line-space regulating device operable to vary the effec tive throw of the pawl while in co6perative relation to either wheel, said regulating device including provision for making suitable compensation for the difi'erence in the spacing of the teeth on the ratchet wheels.

, 38. The combination with a-platen, of a plurality of ratchet's connected .thereto, the teeth of one ratchet beingof diiferent pitch from those of the other ratchet, a line-spacing. lever; a drive-pawl mechanism operable by said line-spacing lever and including means to enable said lever to drive either ratchet at will, line-space regulating means for said ratchets, to enable said lever toturn either ratchet one or more teeth at each stroke at will, said line-space regulating means including provision individual to the ratchets to make suitable compensation for the difference in the pitch of the teeth, and

detent mechanism including shiftable means whfiereby either ratchet may be detented at w1 39. In line-spacing mechanism, the combination with a carriage and a rotary platen thereon, of line-space ratchet wheels connected with the platen, theratchet teeth on one of said wheels being smaller angular distances apart, as measured around the platen axis, than the teeth of the other wheel, so that the line-space distances measured by the teeth on one wheel are smaller than the line-space distances measured by the teeth on the other wheel, an actuating pawl shiftable on the carriage into cooperative relation with either wheel, line-space regulating means operable to vary the effective throw of the pawl while in cooperative relation to either wheel and thereby vary the number of line-space distances through which the platen is rotated at each operation of the actuating pawl, individual detents, and

5 means for shifting either detent out of use.

40. The combination with a revoluble platen, of a plurality of ratchets connected thereto, the teeth of one ratchet being of difn pitch from those of the'other ratchettf a line-spacing lever, a drive-pawl mechanism shiftable to enable said line-spacing lever to drive either ratchet, a manually operable shifter to shift the pawl connection with said lever from either wheel to the other, linedetent mechanism including means also con- -vtrolled by saidimanually operable shifter,

for enabling either ratchet to be detented.

41. The combination of a platen, line-spacing ratchet wheels therefor, the spacing of I one ratchet wheel being difierent from that of the other ratchet wheel, mechanism bv which the platen may be controlled by either ratchet at will, and line-space regulating means for cooperation with said ratchets, whereby the line-spacing movements of the platen may be predetermined when either ratchet is in use, said regulating means including a provision for making suitable compensation for the difference in the Spacing of the teeth on the ratchet wheels. 7

CORNELIUS B. CORCORAN. Witnesses:

Trrtrs H. IRoNs,

F. E. ALEXANDER.