US1263905A - Type-writing machine. - Google Patents

Description

A. 6. F. KUROWSKI. TYPE whnme MACHINE. APPLICATION FILED NOV. 9, 1916.

m 9 1 QM 04 r p A W m a D1 ALFRED Gr. F. KUROWSKI, 0F BROOKLYN, NEW YORK, ASSIGNOE T0 UNDERWOOD TYPE- WRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPE-WRITING MACHINE.

Specification of Letters Patent.

Patented Apr. 23, 191.

Application filed November 9, 1916. Serial No. 130,305.

To all whom it may concern:

Be it known that 1, ALFRED G. F. KURow- SKI, a subject of the Emperor of Germany, but having taken out United States naturalization papers, residing in Brooklyn borough, in the county of Kings, city and State of New York, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is a specification.

This invention relates to line-spacing mechanism for typewriting machines, and more particularly-to devices for rotating the platen through a fraction or part of a regular line-space, forwardly or rearwardly, to enable letters or figures, such as exponents or subscripts, to be written above and below the printing line respectively, and also to enable the writing of a numerator and denominator of a fraction.

ll provide an improved and simplified de vice for this purpose comprising a lever, which controls a movable element engaging. with the usual line-space wheel to rotate the platen through a fractional line-space.

The movable element is normally out of engagement with the ratchet wheel, and is moved into engagement therewith by a preliminary movement of the finger-piece or operating handle in either direction from its normal of the hen le causes the moving element to assist/in efiecting a fractional line-space of the platen.

Other features and advantages will hereinafter appear.

1n the accompanying drawings,

Figure 1 is a side elevation of the typewriter carriage as seen from the left, with the usual finger-Wheel removed, the platen bein in a normal line-space position.

Fig. 2 is a fragmentary side elevation of the typewriter,carriage looking in the same direction as in Fig. 1, and shows the operating handle moved through a sufficient distance to move the moving element or pawl out of engagement with the detent plate and into engagement with the line-space wheel.

Fig. 3 is a view similar to Fig. 2, except that the handle has been given a further movement to efiect a fractional line-space of the platen, so that exponents and the numerator of a fraction may be printed on the work-sheet.

Fig. t is a view similar to Fig. 3, except osition. A continued movement that the platen has been rotated in the opposite direction, so that subscripts and the denominator of a fractionmay be printed on the work-sheet.

Fig. 5is a perspective view of the parts of the fractional line-space mechanism before assembling.

Fig. 6 is a fragmentary front elevation of the typewriter carriage, partly in section, with the fractional line-space mechanism mounted thereon.

A. platen 9 on a shaft 10 is rotatively supported in a carriage comprising end plates 11, there being only one shown in the drawings. To effect the line-space movements of the platen, there is provided the usual linespace handle 12 which, when actuated, moves a slide 13 having a line-space pawl 14 pivoted thereon by a screw 15, against the tension of a spring 16. The pawl 14 engages with a ratchet wheel 17 secured to the platen axle 10 to rotate the platen 9. A springpressed detent 18 cooperates with the linespace wheel to retain the platen in a linespace position. The slide bar 13 and linespace pawl 14 are protected by a cover plate 19 secured 'to one of the end plates 11 by suitable screws 20.-

The typewriting machine includes the usual type-bars 21 comprising types 22, which, in the Underwood typewriter, swing upwardly and rearwardly, against the front face of the platen 9 through the usual ribbon (not shown), to print the characters 23 on a work-sheet 24, which is fed around the platen by the feed rolls 25 and 26. As the typewriter carriage travels along, the types 22 print on the work-sheet 24: in a substantially straight line, unless the line-space mechanism, inoludin the pawl 14, is operated, or unless the p aten is rotated through line-space distances by one or the other of its knobs 27, which aresecured to the platen axle 10 by screws 28.

To print above the usual printing line, whichis desirable when printing exponents and the numerators of fractions, I have provided a fractional line-space handle or fin ger-piece 30, which is swung rearwardly about a shouldered pivot screw 31, threaded into the cover plate 19, to move a stud 32, by means of a cam formed by the cam slot 33, out of a notch 34, and into engagement with the teeth of the line-space wheel 17, as indicated in Fig. 2. The stud 32 projects from line with the notch platen t both sides of the moving element (Figs. 5 and 6), and is moved from the Fig. 2 to the ig. 3 position, where its movement is arrested by a stop or support 36 riveted to the plate 19 and engaging in a slot 37 formed in the floating element 35. When the fingerpiece 30 is moved from the position indicated in Fig. 2 to the position indicated in Fig. 3, it is effective with the stud 32 to rotate the platen through the angular distance indicated at m, which is equal to a fraction of a line-space. If a type-bar is actuated while the platen is in this position, it will print a character above the usual printin line, a distance equal to the arc subtende by the an le 00 at the platen surface.

To reta1n the stud 32 in engagement with the line-spacer'wheel, While it is assisting to rotate the platen, the stud moves under a curvature 38 of the cover plate 19. During the return movement of the operating handle to normal position, the stud is brought in 34, Fig. 2, when the spring 39 becomes effective to assist in moving the stud 32 back into the notch 34:, and also restore the handle 30 to its normal or central position, as indicated in Fig. 1.

To rint below the printing line, which is desirable when printing subscripts or the denominator of a fraction, the fractional line-space handle 30 is moved to the Fig. 4 position. While being moved to this position, the handle is again first effective to move the stud 32 out of the notch 34 and into engagement with the line-space wheel, after which, a further movement of the operatin handle 30 is effective to rotate the rough an angular distance indicated at z in Fig. 4. To return the-platen to its normal line-space position, from the Fig. 4 position, the finger-piece 30 is moved toward its central or normal. position until the stud 32 is again brought in line with the notch 34, when the spring 39 again becomes efi'ective to assist in restormg the handle 30 and the floating element 35 to their normal position and holds them there. It should be understood that the cam formed by the'cam slot 33 may be effective only to move the stud 32 out of the notch 34 in the detent plate 19, and into engagement with the teeth of the line-space Wheel 17, as indicated in Fig. 2, where the stud has substantially reached the end of the cam slot. While the operating handle 30 is being moved from the Fig. 2 to the Fig. 3 position, it has a pushing effect on the stud 32.

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:

1. In a typewriting machine, the coma stop to limit the bination with a platen and a regular linespacing mechanism, comprising a linespace wheel, of a fractional line-space mechanism, comprising a notched detent plate, a finger-piece pivoted on said detent plate, said finger-piece having a cam slot therein, a movable element supported by counter-clockwise direction, and a stop engaging with the other end of said movable element to enable it to limit the rotative movement of said platen in either direction.

2. The combination with a platen having a ratchet wheel, of a platen frame havin a recess, a shiftable plate having at one en a tooth normally occupying said recess, a lever having an-inclined slot to receive said tooth and movable to force said tooth into a notch of the ratchet wheel and displace said ratchet wheel and platen, said platen frame having a guiding surface to retain said tooth in the notch of the ratchet wheel, said shiftable plate having at the other end rotation of the platen, and a spring'to engage said shiftable plate to return the tooth into said recess and also to act upon said lever to retain it in normal position.

3. The combination with a platen having a ratchet wheel of a platen frame havin a recess, a shiftable plate having at one end a tooth normally occupying said recess, a lever having a V-slot to receive said tooth and movable ineither direction to force said tooth into a notch of the ratchet wheel and displace said ratchet wheel and platen in either direction, said platen frame having guiding surfaces to retain said tooth in the notch of the ratchet wheel, said shiftable plate having at the other end a closed slot comprising stops to limit the rotation of the platen in either direction, a fixed pin engaging said closed slot, and a spring to engage said shiftable late to return the tooth into said recess f iom either effective position, and also to act upon said lever to retain it in normal position.

ALFRED G. F. KUROWSKI. Witnesses:

EDITH B. LIBBEY, CATHERINE A. N EWELL.

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