US981386A - Platen-lock for type-writing machines. - Google Patents

Description

I. RBB.

PLATBN LOOK POR TYPE WRTIHG MAEXNES.

` APPLICATION FILED SEPT 29, 190'9.

l0, WM.

2?' team@ llllil WITNESSES @LLM/AT A TTORNE Y.

L GRBB.

- LTEN LOCK FOB TYPE WR'lNG HAGHNES.

WITNESSES APPLIUATIOIT ELED SEPT. 29, 1909.

` Famenne@ Jan. mm1.

2 SHEETS-SHEET 2.

IN VEN TOR. I

regular structure and which, t-hrough the in IRA N. CRABB, OFiEN-AGLEWOOD., COLORADO.

PLATEN-LOCK FOR TYPE-WRITING MACHINES.

Specification of Letters Patent.

Patented Jan. 1o, 1911.

Application filed September 2.91909- Serial No. 520,176.

To all whom it' may concern:

Be it known that I, IRA N. CRABB, a citizen of the United States of America, residing at Englewood, in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Platen-Locks for Type-Writing Machines, of which the following is a specification.

My invention relates to attachments for type-writing machines and more particularly to sto devices by means of which the platen of tie machine may be arrested at any one of a plurality of predetermined points in its rotation.

The object of my invention is to provide a device of simple construction which may be readily attached to ,an existing typewriter machine' without material change in its strumentality of an adjustable member moving coincidently with the platen, w1ll arrest movement of the latter, and in consequence of the sheet ofpap'er carried thereby, atl any( selected point and for the iirpose of 4'preventing writing beyond a tance from the lower edge of said sheet.

My invention, by the accomplishment of the above object, obviates the necessity of raising the platen-carriage to ascertain the position of the paper relative to the line p'f Writing, insures uniformity in the appear ance of the various pages ,of ,a manuscriplt, i t e revents writing on 4che'platen beyond ower edge of the paper, and in general, saves time, labor Aand expense by automatically arresting the movement oftthe paper before its lower edge has reached the point at which the type is lbrought-in contact therewith. i h The above and other objects which will hereinafter mnem,

drawings i; the various views of whichlike parts are similarly designated and in which- 4 Figure 1, represents, an end view of the upper portion of an Underwood typewriting machine With myqattachment in its operative positie a. -Fig. 2, a lan view thereof, Fig. 3, an enlarged, sectional view of the spring-controlled winding spool comprised in my4 invention, and adjacent parts, Fig. 4, anel'ilargedwiewofthe end of the device eterminate dis- 'lj l attained by the mechanisnlillustrated in the accompanying opposite to that shown in the preceding figure, and adjacent parts of the typewrit- Ving machine, Fig. 5, a perspective view of the flexible band employed in the form shown in Fig.. 1, and of the stop button associated therewith, and Fig. 6, an enlarged.

longitudinal sectionv through a portion of said band and through said button.

' Referring to the drawings by numerical characters, let the numeral 2 designate the stationary frame of a typewriting machine, 3 the-reciprocating carriage, 4 the platen revolubly mounted upon the latter, 5 the platen-shaft and 6 the knob at one extremity thereof, by means of which the platen may be manually rotated.

My attachment as shown in the drawings,

comprises 'an angularly bent bar 8 one end of which lstpivotally secured by means of a screw 7 upon the outer surface of the endbar 3a of the carriage 3, and which, at its opposite extremity, is loosely supported fupon the upper surface'of the same. The

bar 8.V is, to this end, formed with a laterally projecting lip 8a which normally rests .upon the upper surface of the carriage and this lip is engaged by the free extremity of a leaf spring 9 whose opposite end is fixed upon the carriage and which servesto resili- V-ently maintain the bar in its normal position', A lever 10 fulcrumed at v12 upon the carrier 8, beneath the free extremity of the bar 8, isemployed to move the latter about its pivot vagainst the action of the s ring 9 for a purpose hereinafter to be described and ity consists to this end of an arm 10a which engages the lower edge of the bar 8 and an larm 10 which, `projecting beyond the carriage is enlarged at its extremity to be pressed' by vthethunib'of the operator.

Revolu ly mounted upon-the bar 8 and, 95

preferably at a point perpendicularly above the axis of the platen shaft 5, is a Windingspool 13, the inner fiange 13a of which is formed with peripheral teeth which, normally, mesh with a gear wheel 14 fixed on lthe platen shaft. A second spool 15 is rotatably mounted upon the shank ofthe before mentioned screw 7- which projects-beyond the outer surface of the bar 8, and the barrel 15 of this spool is made hollow for the reception of a coiled spring 16 the extremities tions 19. .c

'the band, through the action of a spring 21 the last line, predetermined by the operator, v

of -which are respectively secured to the j screw 7 and to the barrel and which, when j wound upt'ends to revolve the-latter in the direction of the arrow in Fig. 1'.

, A flexible band 17., the terminal portions of which wind respectively upon the spools 13 and 15 to which its extremities are attached, projects through a correspondingly formed slot in a stop-lug 18 which projects from the bar 8 intermediate of the two spools and the said band is formed with a series of perforations 19 which are numbered consecutively as shown in Figs. 2 and 5.

A button 20 which is slidably supported upon the upper surface of the band 17 is provided with a'pivoted plate 22 Iadapted to clampingly engage the under surface of and this plate has an upturned detent 23 which'when the button is in its adjusted position, projects into one of the perfora described the construction of my invention, its operation will be readily understood. Premising that the distances between the pcrforations 19 of the band 1,8 are proportional to the distances between the lines of writing on the paper carried by the platen or with other words to thelengths of the intermittent rotatory movements of the latter, and that the first one (l) of the consecutive'l numbers is adjacent 'the extreme end of the band secured to the spool 13, the operator having determined the number of lines to be written on the sheet, adjusts the appliance in the following manner: Having loosened the button 2O from the fiexible band, the former is held in engagement with the stop-lug 18 and the platen'is rotated by means of the knob 6 for the purpose of wind` ing the band upon the spool 13. This operation is continued until the perforation 19, corresponding, numerically, with the last line to be written on the sheet, is below the button so as to receive the detent 23 on the clamp 22 when th'e latter is brought in engagement with the under surface of the band to firmly secure the button in position. The free end of the bar 8 is now raised by means of the thumb lever 10, to disengage the toothed flange 181 of the spool 13, from the gearwheel 14:, for the purpose of rewinding the tape upon the spool 15, which isautomatically accomplished by action of the spring 16 which was wound up during the rotatory movement of the platen. When the entire band is thus unwound from the spool l5, the device is returned to its original position after which the sheet of paper is inserted in the machine. As the movement of the band is coincident with the intermittent movement of the platen, the button 20 will engage the stop 18 at the same time that Having thus is written on the sheet, and it will by reason of said engagement, arrest the movement of the band and, in consequence, that of the platen and the sheet of paper. carried thereon.

I wish it understood that while I have shown and described the invention in the best form now known to me, variations in the form and arrangement of the parts, necessary to render the device suitable for use on the many dierent writing machines at present on lthe market, may be resorted to Without departing from the spirit of the invention.

What I claim and Letters Patent is 1. In a typewriting machine, the combination With the rotative platen, of a rotative spool cooperative therewith, a flexible band arranged to be wound on said spool during its movement in one direction, a spring actuated spool connected with the opposite end (if said band and adapted to move it in the opposite direction, a stop member on said band, and a means for arresting the movement of said member at a predetermined point.

2. In a typewriting machine, the combi-- nation with the carriage and the platen rotatably mounted thereon, of a bar movably supported on said-carriage, a winding spool on said bar, means for transmitting the movement of the platen to said spool, a flexible band arranged to be wound on said spool during its movement 'in one direction, a sto said ar for arresting the movement of said member at a predetermined point.

3.,In a typewriting machine, the coni, nation with the carriage and the platen ref` tatably mounted thereon, of a bar movably supported on said carriage, a winding spool on said bar, means for transmitting the movement of the platen to said spool, a ieX- ible band arranged to be wound on said spool during its movement in one direction, a spring actuated spool on said bar connected with the opposite end of the band and adapted to move it in the opposite dif rection, a stop member on said band, and a means on said bar for arresting the movement` of saidI member at a determinate point.

4. In a typewriting machine the combi nation with the -carriage and the laten, rotatably mounted thereon, of an e ement pivotally mounted at one of its ends to said carriage, its opposite end being normally held against movement beyond a predetermined point a winding spool on said clefl ment, gear wheels respectively on said spool and on the platen, which are inoperative engagement while the bar is in its normal position, a liexible band arranged to be wound on said spool during its movement desire to secure by member on said band, and la means on lio in one direction, a spring-atugted spool on said bar connected With the opposite end of the band and adapted to move it in the o pposite direction, a stop member on said band, and a means on said bar for arresting the movement .of said member at n determinate point. f

In testimony whereofA I have affixed my signature 1n presence of two Witnesses,

111A N. CRABB.

Witnesses:

`Gr. J. ROLLANDET, I M. L. GEARY. u

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