US1474111A - Ribbon spool for typewriting machines - Google Patents

Description

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c. GABRIELSON RIBBON sPooL FOR TYPEWRITING MACHINES 2 SheecS-Sheet 1 Filed April 14 3 mundo@ @Hoz MM45,

NOV. 13, ma mmm C. GABRIEL-SON RIBBON SPOOL FOR TYPEWRITING MACHINES Filed April 14 1922 2 Shee'LS-Sheei 2 Fatented Non. T3, ll.

UNET@ STATES CARL GBRIELSON, 0F SYRACUSE, NEW YORK, ASSIGNOR ltlll PATENT @FFTCCW T L. C. SMITH it BRQS.

TYPEWRITER C0., 0F SYRACUSE, NEW YORK, .d CQRPORATION OIF NEW YORK.

RIBBON SPOOL FOR TYPEWRITING MACEITNES.

Application tiled April M, i922. Serial No. 552,771.

To aZZ whom t may concern.'

Be it known that l, CARL GABRIELsoN, a citizen of the United States, and residing at Syracuse, Onondaga' County, State o New York, have invented certain new and uesful Improvements in Ribbon Spools for 'llypewriting Machines, of which the tollowing is a specification.

The present invention relates to typewriting machines and particularly to typewriter ribbon spools.

ln Patent No. 929,933 granted August 3, 1909, to the present applicant, a typewriter ribbon mechanism is disclosed by means ot which the ribbon is automatically advanced across the printing point, being unwound :from one ribbon spool and wound up upon a second ribbon spool, the mechanism being designed and constructed so that the rotation ot the spools is reversed, and hence the movement of the ribbon, when the delivering spool has become completely empty. The spools illustrated in this patent are, however, intended or continuous use with the machine, the fresh ribbons being wound thereon to replace used ribbons. rllhe re moval of a worn out ribbon and its replacement by a fresh ribbon involves the expenditure of time on the part of the operator and it is the object of the present invention to prevent this loss ot operating time by providing an inexpensive ribbon spool which may be supplied to typewriter operators with a length of ribbon wound thereon and which spool may be quickly .substituted tor a spool ot worn out ribbon, this last mentioned spool being then discarded. ylhe spool has a number of novel features of construction and the invention may be embodied in various structures. ln the present application one form is fully disclosed by way ot example.

' ln the drawings:

Fig. l is a vertical section through a ribbon spool shaft showing the improved spool mounted thereon and the ribbon reversing mechanism which cooperates with the spool;

Fig. 2 is a top plan view of the same with spool removed but its operative position indicated in dotted lines;

Fig. 3 is a view similar to Figure 2, the parts being shown however in the positions which they occupy when the spool is in place;

Fig. el Figure 3;

Fig. 5 is a bottom plan view of the spool;

Fig. 6 is a top plan view of the blank which forms the top flange of the spool;

Fig. 7 is a top plan view of the blank which forms the bottom flange of the spool;

Figs. 8 and 9 are sections on lines 8-8 and 9-9 of Figures 6 and 7 respectively;

Fig. 10 is a plan view of the blank form in which the core of the spool is formed;

Fig. 1l is an edge View of the same;

Fig. 12 is a longitudinal section through a sleeve which forms portion ot the spool;

Fig. 13 is an end view of the same;

Fig. 14; is a perspective view ot portion of the ribbon reversing mechanism;

Fig. 15 is a plan view ot the core or the spool just prior to assembly with the top and bottom anges thereof; and

Fig. 16 is a section taken axially through a portion of the spool and drawn to a relau tively large scale to show the manner in which the parts are secured together.

The main members ot the ribbon reversis a section on line fi-d ci? ing mechanism and their modes ont operation are fully described in my prior patent above mentioned, and only so much. of the ribbon mechanism is illustrated in the drawings as is necessary to understand the manner of its cooperation with the improved ribbon spool which is disclosed. Tt will also be understood that the ribbon spools at both ends of the typewriter are similar and the parts ot the ribbon mechanism immediately associated with such spools, so that it is only necessary for a complete understanding et the present invention to illustrate and describe one ribbon spool and its associated mechanism.

A corner ot the trame or' the machine is indicated at 10, which trame is provided with a stepped recess 1l having' a central boss l2 provided with a vertical axial aperture 13 in which the ribbon spool shaft lit is rotatably supported. Shaft 14 has at its lower end a beveled gear l5 which faces downwardly and which is adapted to mesh with a beveled pinion 16 on the vertically movable drive shaft i7 which extends from till titi

trent to rear of the machine and which is given a step by step rotary movement by mechanism controlled by the operation or' the keys. The upper end or shaft ll is two diametrically opposed and upwardly extending teeth 19 thereon, and also has an axial internally threaded cylindrical recess 22.

A thumb screw is provided for detachably securing in place the ribbon spool S, the threaded spindle 21 of the thumb `screw extending through a central opening 23 in the top flange 24 of the spool and the under surface of the thumb screw bearing upon the margin of this opening and upon the upper end of sleeve 25 which surrounds the spool shaft 14 and the upper end of which extends through opening 23 in flange 24. rlhis sleeve is provided adjacent its upper end withan annular flange 26 and is secured to the flange 24 in any suitable manner, as

by welding or by a force fit. The lower end of the sleeve rests upon collar 18 of shaft 14, and is provided with suitable notches to receive the two teeth 19 extending upwardly from the collar..

The core of the spool S comprises. a cylindrical member 27 having upwardly extending anges 28 at its upper end which extend through openings 24 in the upper flange 24 of the spool, and having downwardly extending. flanges 29 at its lower end which extend through openings 30 in the lower flange 30 of the spool. ltwill be seen that there are three upper flanges 28 and four lower flanges 29 and that one flange in each set is formed in two half portions located at the ends of the member 27, as shown in Figs. 10 and 15. The two parts of each of these split flanges extend through a single opening in the adjacent spool flange and the ends of member 27 are thereby secured in substantial abutment. rlhe flanges 28 and 29 are headed over, as shown in Fig. 16, so that the three main f portions of the spool are firmly secured together. The core has a horizontally disposed elongated slot oropening 31. 'llhe bottom flange 30 is provided with a plurality of depressed portions 32 which are elongated and the inner surfaces 33 of which comprise cam surfaces, adapted to coact with a moving member' mounted on the frame of the machine when the spool is being placed in position, as will hereinafter be more fully explained.

Secured to the bottom of the cup-shaped depression-11 is a plate 35 which is substantially lll-shaped and which is provided with parallel downwardly extending arms 36 which pass through an opening 37 in the frame. lPivotally supported between these arms 36 is a rocker 38 which has an upwardly extending lever arm 39 and a downwardly extending lever arm 40. Lever arm 39 has a horizontal portion 41jat its upper end which is horizontally opposite aperture 31 in the spool and which cooperates therewith in effecting the reversal of the ribbon `spool at the proper time. Portion 41 is camshaped, as shown, and a spring 42 which has one end secured to plate 35 and the other end bearing upon the upper edge of the rocker 38 normally tendslto force the cam 41 outwardly. `Such outward movement is prevented bythe ribbon wound on the spool so long as such ribbon is present, but with the unwinding of the last coil of ribbon kfrom the core, spring 421 becomes effective to move the cam 41 outwardly through openinl utward movement of the lever 39 of course, results in rotation of rocker 38 so that the horizontally extending tooth 43 finds its way between the teeth of .the rotating pinion 16 which, of course, has been disengaged from gear 15 while the spool illus- Tated has been the feed spool or the unwinding s ool. Continued rotation of shaft 17 in the irection of the arrow (Figure l) results in upward movement of pinion 16 and shaft 17 and at an intermediate point in its upward travel a snapover mechanism (not illustrated) becomes effective to quickly move it intoengagement with gear 15. rllhe spool illustrated is then operatively connected to shaft 17 and becomes the dri-ven spool, its direction being reversed, andwithdra'wing ribbon from the spool at the opposite end of the machine, which spool has been operatively disconnected from the driving mechanism simultaneously with the operative connection to' this mechanism of the spool illustrated.

When the ribbon has become exhausted a fresh ribbon is substituted by removing that spool upon which the old ribbon has been completely wound and replacing it by a new spool having a fresh ribbon. To remove the old spool'the thumb nut 21 is unscrewed and the spool lifted vertically up-y ward, the end 41 of lever 39 moving inwardly as its edge rides over the lower edge of aperture'312and the inner edge of the bottom flange 30. As soon as the spool has been removed spring 4 2 immediately tends to return cam 4l to the posit-ion in which it is illustrated in Figure 1, in which position it would interfere with the emplacement of a new spool. i

Means is provided, therefore, for 'moving the upper end 41 of lever 39 inwardly toward shaft 14`when the spool is removed. rlhis means comprises a lever 50 mounted to swing or revolve about a vertical axis 51 and provided with a coil spring 52, one end of which bears against plate 35 and ythe other end against the downwardly extending flange 53 of lever 50, which comprises an abutment therefore. Spring 52 acts on lever 50 in such manner that the end 54 of this lever tends to. constantly enga e lever 39 and to'force this lever toward s aft 14, the

agraria spring 52 being considerably stronger than spring 42 and ahhx to overcome the opposition of this last mentioned spring. The opposite end of lever 5() has a flange or eX- tension projecting vertically upward and adapted te extend within the core of the spool as shown in Figures 1 and 4.

lVhen the spool is lifted from the machine the parts assume the positions in which they are illustrated in Figure 2. In replac ing the spool it is lowered over the shaft lt until the lower surface of its bottom flange strikes the. upward projection 55 of lever 50, the cam lll being held of course. by this lever in its innern'iost position. The spooly is then rotated about its axis until the end of flange. 55 lies between two of the. cams 32 of the spool and upon further rotation of the spool in either direction flange 55 is moved inwardly by one of the cam surfaces 33 into such position that it may enter a core, as shown in Figure 3, and when it has reached this position. the spool will drop to its lowermost or final position. The ribbon may now be attached to the spool at the opposite end of the machine. Rotation of lever 5b in a clockwise direction as just described, of course, allows cam 4l to move outwardly to opera-tively engage the inner surface. of the spool.-

ln Figures 5 to lll inclusive, the various component parts of' the spool are illustrated before assembly. The top and bottom flanges and core are. stamped from sheet met-al, the top flange having central and marginal stiffeuing ribs and Gl, respec.- tively, and the bottom flange being provided with the cams At one end the blank is provided with an integral point or catch 63 which is slightly offset and which is sufficiently sharp to serve to catch and hold the end of theI ribbon. In Figure l5 the core is illustrated just prior to assembly with the top and bottom flanges, which assembly is effected preferably by heading over the tops of the tongues extending there from but may be done otherwise if desired as by welding.

From the foregoing description of the in vention one skilled in the art will appreci ate the advantages of the invention, and will realize that it may be modified considerahly without departing from its spirit and scope.

Having thus described the invention what is claimed as new and desired to be secured by Letters Patent is:

1. A typewriter' ribbn spool having a core and top and bottom flanges, the bottom flange having a central aperture, and a cam surface facin said central aperture and inclined to a. ra. ius passing therethrough from the center of said aperture, for directing a. coopera-ting member toward the central aperture when the spool is rotated on a ribbon spool shaft.

2. A. typewriter ribbon spool having a core and top and bottom flanges, the tbottom flange having a central aperture and oppositely directed cam surfaces each facing toward said central aperture and inclined to a radius therethrough from the center of the aperture,v for directing a cooperating member toward said central aperture when the spool is rotated in either direction on a ribbon spool shaft.

3. A typewriter ribbon spool having a hollow core and top and bottom flanges, the bottom flange having a central aperture registering with the hollow core and being provided with a cam surfare facing toward the aperture and extending outwardly from a point on the edge of said central aperture.

l. A typewriter ribbon spool having a. hollow core and top and bottom flanges, the bottom flange having` a central aperture registering with the hollow core, and being provided with two oppositely facing' cam surfaces extending outwardly from the central apcrtu re.

5. A typewriter ribbon Spool having a hollow core, and top and bottom flanges, the bottom flange having a. central aperture registering with the hollow core, and being provided with four cams arranged at equal intervals around the central aperture, each 'am having two cam surfaces substantially tangent t-o the. central openino at a common pointl and extending outward y therefrom.

G. A typewriter ribbon spool including upper and lower flanges and a central core, said core comprising a curved metallic. strip provided, with flanges along its upper and lower edges which extend through apertures in the upper and lower flanges of the spool, each corner of the strip being provided with one of said flanges and the two upper corner flanges extending through a` single aperture in the upper spool flange and the two lower corner flanges extending through a single aperture in the lower spool flange, wl'iereby thel ends of the strip are held in substantial. abutment.

ln testimony whereof l hereunto amig my signature.

CARL GABRELSUN

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