US2253424A - Typewriting machine - Google Patents

Description

TYPEWRITING MACHINE Filed July 10, 1940 INVENTOR7 .afirmm gm ATTORNEY W. A. GABRIELSON Aug. 19, 1941.

Patented Aug. 19, 1941 TYPEWBITING MACHINE William A. Gabrielson, Syracuse, N. Y., minor to L. C. Smith & Corona Typewrite rs, Inc.,

Syracuse, N. Y., a corporation of New York Application July 10, 1940, Serial No. 344,767

7 Claims.

The invention relates to improvements in typewriting machines and more particularly to paper feed bail mechanism associated withthe roller platen of such a machine to hold the work sheet or sheets to the platen above the printing line.

The invention provides an improved form of paper holding and feeding bail and an improved mounting therefor upon the platen carria e of the machine, and also provides a paper bail device of the overhead" bail type which is highly efficient in operation and may be conveniently manipulated in using the machine. The construction is also such that it may be produced at low cost and the bail may be readily and quickly attached to and disassembled from the platen carriage.

To the foregoing and other ends which will hereinafter appear from the following description of the preferred embodiment of the invention illustrated in the accompanying drawing, the invention consists in the features of construction, arrangement of parts, and combinations of parts and devices particularly pointed out in the appended claims.

In the drawing:

Fig. 1 is a fragmentary top planview of the improved machine with the bail in its "on or normal working position;

Fig, 2 is a fragmentary vertical longitudinal sectional view of the machine on the line 2-2 of Fi 1;

Fig. 3 is a detail sectional view on an enlarged scale and taken on the line 3-4 of Fig. 1;

Fig. 4 is a detail sectional view similar to Fig. 3, but showing the bail in fully cast-oil position;

Fig. 5 is a detail sectional view on an enlarged scale and taken on the line 5-! of Fig. 3;

Fig. 6 is a detail view similar to Fig. 3 illus-. trating a method of detaching the ball from its mounting on the carriage; and

Fig. '7 is a detail perspective view showing one of the two similar pivot ends of the hail, the one shown being the one at the right hand end of the carriage,

The improvements are shown embodied in a known typewriting machine, the L. C, Smith typewriting machine, and only so much of the known machine as is necessary, for a clear understanding of the present invention has been shown in the drawing and will be described.

The usual mail frame It of the machine has the usual platen carriage ll mounted thereon to travel back and forth transversely of the machine, and the usual roller platen structure is rotatively journalled in the ends of the carriage for travel therewith and for revolution of the platen roller to feed the paper, said structure including the usual rotative roller platen l2 and the usual finger wheels I! for rotating the platen. The usual pawl and ratchet line spacing mechanism fcr rotating the platen roller is also provided, the ratchet wheel of said mechanism being shown at M. 'Rigidly held to the carriage ad- Jacent opposite ends thereof by screws ii are the two usual upwardly and rearwardly extending end brackets l8 located in rear of the roller platen structure. Each metal bracket It has rigidly secured thereto at its outer edge as usual a rigid metal and plate l1, said plates. disposed vertically edgewise in vertical parallel planes extending fore-and-aft of the machine. The improvements will now be described.

The detachable paper bail consists of a pair of rigid fore-and-aft extending metal side arms la, a front rigid metal cross rod i9 rigidly and permanently fixed at its ends to the front ends of the side arms, a pair of combined pivot and anchorage members 20 each formed of a'single piece of metal and fixedly and permanently held to the rear ends of the respective side arms and extending inwardly therefrom transversely of the machine, and preferably also includes a pair of paper feed rolls 2| journalled on the cross rod IQ of the ball. The said bail is a rigid unitary structure which is detachable as a unit from the carriage as hereinafter described.

Each combined pivot and anchorage member 20 of the bail consists of a cylindrical metal stud cut away or flattened at one side at the bottom of said. groove to a diametrical line of the stud or stub shaft providing a flat diametrical wall or face 23 at the bottom of the groove the ends of which are joined by a semi-cylindrical bottom face or wall 24 of the groove, said flat wall or face 23 extending preferably across the member 20 as shown substantially longitudinally of the side arm of the bail,

The combined pivot and anchorage studs or stub shafts 20 of the bail are journalled removably in open bearing slots or notches 25 formed in the respective plates I1 above the brackets 16 and above and in rear of the roller platen structure l2-l3. Each slot or notch 25 is open at its upper end and preferably extends upward and rearward as shown, being as wide as the maximum diameter of stud and rounded or curved at its lower closed end to conform with the contour of the major body portion of stud 20.

The thickness of each plate I"! conforms substantially with the distance between the inner face of the adjacent bail side arm I 6 and the outer edge of the groove 22 of the stud 26 engaged in notch 26 of said plate, and each said ball side arm is enlarged at its rear end opposite the attached stud as shown at I! to abut the outer face of the adjacent plate I! in all rocked positions-of the bail. Parts ll are coactive with the plates I I to assist in holding the bail in assembled working relation with the carriage and platen against axial movement of the ail.

To further hold the bail against axial movement and to releasably hold it pivotally engaged in the open-top bearing slots or notches 2!, as well as for other purposes hereinafter explained, two stiff wire springs 26 are provided which extend upwardly and rearwardiy at the inner faces of the respective plates i1. Between its ends.

. near its lower end, each spring is coiled about the shank of a screw 21 tapped in the adjacent plate II. The lower arm of each spring 26 bears constantly against the front face of the adjacent bracket l6, and the upper arm of each spring is resiliently heldby the spring tension to extend at least partly, and preferably entirely, across the adjacent slot at the inner face of the adjacent plate I! with said upper arm engaged in groove 22 of the adjacent stud 26 of the bail. At its upper end each spring 26 is preferably bent to form an eye or closed loop 26 for engagement by a suitable hook to resiliently bend the upper portion or arm of the spring forward to permit the trunnions to be passed through the slot mouths for attachment and detachment of the bail. Said springs 26' constantly. hold the trunnions down to the bottoms of slots 25.

When the ball is assembled on the carriage with rolls 2| in contact with the platen roller i 2, the flat faces 23 of studs 20 face upward and preferably also slightly forwardly, as shown in Figs. 2 and 3, with the springs 26 pressing resiliently down on the front ends of said flat faces 23 to yieldingly hold the rolls 2| to the platen or to paper passed about the platen. Upon a predetermined extent of upward and rearward swinging of the ball away from the platen, the springs 26 will no longer press on flat faces 23 but will press on the semi-cylindrical faces 24 of studs 20 and thereafter said springs will serve to frictionally hold the bail cast-oil. from the platen in various positions up to its maximum cast-off position. The maximum cast-off position of the bail is determined by engagement of the bail side arms with suitable stop means such as lugs 26 on plates II.

Throughout most of the throw of the bail from its position of Fig. 4 to that of Figs. 1, 2 and 3 the springs bear on faces 24 and will frictionally hold the ball at any point. Throughout the remainder of the throw of. the bail from its position of Fig. 4 to that of Figs. 1, 2 and 3 the springs press on the flat faces 23 and resiliently force the bail toward the platen. Preferably the parts are so shaped and arranged that the springs 26 engage only the front ends of flat faces 23, as shown, when the studs 20 are seated in notches 25.

What I claim is:

1. In a typing machine having a platen carriage, a roller platen journalled on the carriage, and a paper-holding bail coactive with the platen, means detachably pivotally holding the bail to the carriage for swinging of the bail toward and from the platen, said means comprising, in combination, a pair of journal members fixedly held to the respective side arms of the bail and detachable from the carriage with said bail, a pair of bearing supports on the carriage adjacent opposite ends of the carriage each formed with an open bearing slot for one of said journal members, a pair of springs anchored to the respective bearing supports, each spring and the adjacent bail side arm abutting opposite faces of the adjacent bearing support, each journal member having a circumferential channel in which the adjacent spring is releasably engaged, each spring having a free end portion normally extending acrossthe mouth of the adjacent bearing slot and flexible to permit the journal member to be moved into and out of the slot.

2. In a typing machine having a platen carriage, a roller platen journalled on the carriage, and a paper-holding bail coactive with the platen, means detachably pivotally holding the bail to the carriage for swinging of the bail toward and from the platen, said means comprising, in

combination, a pair of journal members fixedlyheld to the respective side-arms of the bail and detachable from the carriage with said ball, a pair of bearing supports on the carriage adjacent opposite ends of the carriage each formed with an open bearing slot for one of said journal members, a pair of springs anchored to the respective bearing supports, each spring and the adjacent bail side arm abutting opposite faces of the adjacent bearing support, each journal member having a circumferential channel in which the adjacent spring is releasably engaged, each spring having a free end portion normally extending across the mouth of the adjacent hearing slot and flexible to permit the journal member to be moved into and out of the slot, and the channel in each journal member having a bottom wall flattened transversely of the Journal member at one point therearound for engagement of the adjacent spring with said flattened wall portion while the ball is swung to or close to the platen. I

3. A typewriting machine having, in combination a roller platen, a paper-holding bail swingable to and from the platen, a platen carriage in which said platen is journalled having a pair of bail supporting members provided with bearing notches for the bail, the side arms of said bail provided with inwardly extending fixed trunnions journalled in said bearing notches, said side arms each abutting the outer face of a difierent one of said supporting members adjacent the bearing notch therein, and a pair of spring means each releasably engaged with a different one of said trunnions at the inner face of the adjacent supporting member to releasably hold the trunnion in its bearing notch and to assist the said supporting member in holding the bail against axial movement.

4. A typewriting machine as claimed in claim 3, wherein the carriage is provided with stops limiting movement of the ball away from the platen, each trunnion has a curved surface concentric with its axis and has a flat surface extending transversely of its axis, which surfaces are engageable by the adjacent spring means as the bail approaches said stop means and said platen respectively, and each spring means is a wire spring having a trunnion engaging arm the free end of which is formed with an eye or loop to facilitate flexure of said arm to free the adjacent trunnion, each said trunnion having an annular shoulder between which and the ad- Jacent supporting member said spring arm normally extends.

5. In a typing machine having a platen carriage, a roller platen joumalled on the carriage, and a paper-holding bail coactive with the platen, means detachably pivotally holding the bail to the carriage for swinging of the bail toward and from the platen, said means comprising, in combination, a pair of journal members fixedly held to the respective side arms of the bail and detachable from the carriage with said ball, a pair of bearing supports on the carriage adjacent opposite ends of the carriage each formed with an open bearing slot for one of said journal members, a pair of springs anchored to the respective bearing supports, each spring bail side arms abutting opposite Y faces of the adjacent bearing support, means to lock the bail and the ioumals to the bearing supports to hold the bail against lateral shifting when in paperfeeding position, each spring releasably engaging the. adjacent journal and each spring having a free end portion normally extending across the mouth of the adjacent bearing slot and flexible to permit the journal member to be moved into and out of the slot.

6. A typewriting machine having, in combination, a roller platen, a platen carriage in which said platen is Journalled, apaper-holding bail -co-active with the platen and having side arms provided at their rear ends with journals extending inwardly longitudinally of the carriage, each bail journal being formed with an annular groove the bottom wall of said groove comprising a curved surface concentric with the axis ofthe journal and a flat surface connecting the ends of said curved surface, said carriage having a vertically arranged upwardly extending bearing plate at each side thereof the rear portions of the side arms of the said bail engaging the outer faces of said plates, each plate being formed at its upper edge with upwardly opening bearin slotsin which said inwardly extending journals are removably engaged. spring means in pressing and the adj acent engagement with the said journals, said spring means comprising a spring for each journal, each spring anchored to the carriage on the inner side ofone of said bearing plates and having an upwardly extending arm engaging the inner face of said bearing plate and extending over the top of one of the loumals and engaged in the groove thereof and pressing on the said curved and fiat surfaces of the journal successively during rocking of the bail toward and from the platen, the

journals being held between the springsand the closed lower ends of the bearing slots, said arms of the springs being flexible to release the journals for withdrawal through the open ends of the slots, whereby the springs will lock the Journals to the bearing plates against axial movement and will prevent accidental withdrawal of the journals from the. bearing slots, in all positions of the bail.

7. A typewriting machine, in combination, a roller platen, a platen carriage in which said platen is journalled, a paper-holding bail formed as a complete rigidly connected unit and comprising side arms provided at their rear ends with rigid journals extending inwardly longitudinally of the carriage and a rod connecting the front ends of said side arms and carrying feed rollers. said carriage having vertically arranged upwardly extending bearing plates at each side thereof, the rearportions of the side arms of said ball engaging one of the side, faces of the said plates, each plate being formed atits upper edge with upwardly opening bearing slots in which said journals are removably engaged, springmeans in pressing engagement with said journals, said spring means comprising a spring for each journal, each spring anchored to the carriage and having an upwardly projecting arm extending along one surface of a bearing plate on the opposite side thereof from theadjacent side arm and projecting over the top of one of the Journals and pressing on the said journal during the rocking of the bail toward and from the platen, the journals being held between the springs and the closed lower ends of the bearing slots, said arms of the springs being flexible to release the journals for withdrawal through the open ends of the bearing slots and the remov of the paper ball as a complete unit.

a; aannmtson.

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