US977019A - Type-writing machine. - Google Patents

Description

A. G; P. KUROWSKI.

7 TYPE WRITING MACHINE. APPLICATION FILED AUG. 19, 1910.

Patented N0v.29,1910.

PATENT OFFICE,

ALFRED e. r. konowsxr, or New roan, N. Y., assreno'n "r UNDERWOQD TYPE- wn'rr en COMPANY, or NEW Yank, N. A. CORPORATION or DELAWARE.

TYPE-WRITING MACHINE;

Specification of Letters Patent. Patented NOV. 29, 1910.

To all whom it may camera:

i below the linoof writing, difficulty has been Be it known that I, ALFRo) G. F. KW nowsxi, a citizen of the United States, residing in the borough of Brooklyn, city of New York, in the county of Kings-and State of New York, have invented certain new and useful Improvements in Type-VVriting Machines. of which the following is a specification.

This invention relates to line-spacing niechanismsfand especially to devices for advancing the'platen through part of a line space to enable the printing of characters, or symbols, fete, below the usual writing line on the work sheet.

In printing thedenominators of fractions encountered, because of the necessity of advancing the platenfby hand more thanhalf of a line space so that the types would print below the divisor-lines, and of holding the platen steady, against the tension of the usual spring detentQwhile' striking the keys.

The main object of this invention is to enable denominators or other. subscripts to be readily printed below the writing line.

This is done by mechanically advancing the platen through more than half a line'space; and retaining it where adjusted; the usual spring detent being rendered ineffective to complete the rotation of the platen through.

an entire line space. A dog or tooth is forced into engagement with the space wheel to advance the platen as required, and the usual spring detent is automatically cast off from the line-space wheel.

In the accompanying drawings, Figure 1 is a perspective, showing one form of the in- -vention applied to an Underwood writing machine. Fig. 2 is a side view, the device being idle. Fig. 3 shows the device in use. A platen 1 is fast on an axle 2, journaled in platen frame ends 3, and is line-spaced by a lever 4: through a slide 5 and pawl .6, the latter driving a toothed wheel 7 fixed on the axle. A spring detent 8 engages the wheel 7. The usual releasinglever 9, (Fig. 1), loose on the axle, is rocked to cast off the-detent, when it is desired to'write on ruled lines, etc.

Type bars 10, carrying types 11' strike against the platen, certain of said types preferably being made smaller than the ordinary lower case types, and arranged near the outer ends of the bars, as at 11, to form exponents or fraction numerat'o'rs, which strike the platen only when the latter is in upper case position to'print-above the usual writing line.

By swinging forwardly the handle 12 of a finger lever, pivoted at 13, a plate or broadened end 14, forming the opposite arm (Fig. 2) to its active position, (Fi 3) to enter a tooth 15, carried thereby, etween any two adjacent teeth of the wheel 7 and advance the platen part of a regular line types, shall strike belowthe usual line of writing (and sometimes directly beneath the exponents previously printed as in the case of fractions).

A stop 16 on ter by striking one end edge of a slot 17 when the'platen has been advanced more than half a line space,-'at which time the tooth 15 may stand about in linewith the pivot 13 of the lever andthe axle 2, (see Fig.3).. H v

The platen remains in the Fig. 3 position during the operation of the type keys, without the necessity of the operator retaining his hold on the lever 12; since a spring 18 accidental displacement) is too weak to rotate the platen. A 'pin 21 on the detent 8 normally rests in a recess 22 in the broadened end 141. of the lever, one wall 23 of which recess forms a cam, which leads to a dwell portion 19 forming an are about concentric with the pivot 13 and preferably constituting one wall of a slot 20. The lever on its initial stroke causes the cam 23 to dlsengage the pin and detent from the wheel, the pin riding onto the dwell 19 to hold the detent disengaged, while the line space wheel is turned by the dog 15. By relieving the wheel of the pressure exerted by the detent, danger is avoided of the platen being turned through an entire line space by the detent settling into thenext notch. The 51013 20 15 of sutlicient width to accommodate the throw of the pin when cast off by the usual detentreleasing lever 9. When the lever '12 is moved back toward its idle position, to release the tooth 15 from the wheel, said tooth starts the platen toward initial position.

Having thus described my invention, I claim:

1. In a typewriting machine, the combinaof the lever, is rocked from its idle position (which normally holds the'lever 12 agains t' space so that the exponent types 11 or other the handle 12 arreststhe latthe lever.

wheel connected with the platen, and a detent engaging the Wheel, of a tooth to turn the wheel and platen through part of a linespace, and a vibratory finger lever controlling the tooth and having a recess to accommodate a pin on the detent, onewall of the recess operating to cast off the detent von the initial stroke of the lever, and a dwell p01- tion to which the wall of the recess leads to hold the detent disengaged. I

3. In a typewritingmachine, the combination of a platen, a notched or toothed wheel connected with the platen, a detent to engage the wheel, said detent having a pin,

a finger lever having a tooth to turn the wheel through part of a line-s ace, said lever having a cam recess, one w'al of which bears against the pin on the detent to cast oif the detent, a d ell portion forming one edge ofthe slot and connected to the wall of the recess tohold the detent disengaged, one end of said slot being enlarged to accommodate the throw of the the releasing lever.

ALFRED \Vitnesses:

K. FRANKFOR'I, B. GOLDBERG.

pin when cast ofi' by G. F. KURowsKI.

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