US1392940A - Typewriting-machine - Google Patents

Description

W. F. HELMOND.

TYPEWRITING MACHINE. APPLICATION FILED FEB. 27, 191 9.

1,392,940, Patented 0013. 11, 1921. 2 SHEETS-SHEET I. Q Q *w W. F. HELMOND. TYPEWRITING MACHINE. APPLICATION FILED FEB.27. 1919.

2 SHEETS-SHEET 2.

Patented Oct. 11, 1921;

UNITED STATES PATENT orFicE.

WILLIAM F. HELLEOND, 0F HARTFORD, CONNECTICUT, AS S IGNOR [E0 UNDEBWOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y. A CORPORATION OF DELAWARE.

Y EW G-MACHlNE Specification of Letters Zatent.

Patented Oct. 11, 1921.

Application filed February 27, 1919. Serial No. 279,526.

T 0 (M whom it may concern:

Be it known that I, XVILLIAM F. HELMOND, a citizen of the United States, residing in Hartford. in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Typewriting-lvlachines, of which the following is a specification.

This invention relates to roll mechanism for feeding paper around the cylindrical platens of typewriting machines, and an object of the invention is to improve and simplify such mechanism to the end that the cost of manufacture is lessened and the parts are more readily assembled and adjusted in the extremely limited space in which these parts must be confined.

A feature of the invention resides in the compact construction of the pressure-rollsupporting arms and the means associated therewith for regulating the pressure of the rollers against the platen, each arm having formed as a part of its integral structure a hub whereby it is mounted on a supporting shaft, a roll-supporting member, a springeng'aging; offset. and a lug engageable by the roll-release devices. The springs are of the compact and durable compression helix variety, and the tension-adjusting means is convenient of access. Also the springs exert their action. in an advantageous way ,to'hold the rolls against the platen, owing to the fact that each is mounted substantially in the plane of the hub which carries the arm to which the spring is related.

Another feature of the invention relates to the simplicity of construction of the lever for controlling the throw-off of the pressure rolls, said lever being formed of a single piece, and so shaped that a substantial hearing is provided for the pivot thereof. The lever may be stamped out of sheet-metal, thereby saving materially in the cost of manufacture. The cost of assembly is also reduced owing to the smaller number of parts that have to be properly coordinated and secured together. To prevent the lever from rattling, a spring is used which surrounds the pivot of the lever, the spring bein compressed between the lever and the stud carrying the pivot.

Other features and advantages will hereinafter appear.

In the accompanying drawings, I I I l gure 1 1s a sectlon on the line A-A of Fig. 2 is a perspective View of the platen 1 Fig. 4 is an elevation of the rolls released. P

Fig. 5 is a plan with the platen removed.

Fig. 6 is a front elevation of the parts shown .in Fig. 5, and, in addition, showing the release lever and connections.

Fig. holding the pressure rolls against the platen, and showing the means whereby the tension of the spring is adjusted.

Fig. 8 is a perspective detail of the extreme right-hand roll-supporting arm shown in Fig. 2. I.

Fig. 9 is a perspective detail of the arm immediately to the left of that shown in Fig.1. 8.

Fig. 10 is a detail of the support for the throw-off lever.

Fig. 11 is a perspective detail view of the clip for holding the spring-adjusting screw from accidental displacement.

Fig. 12 is a perspective detail of some of the parts shown in Fig. 8. said parts being shown separated so that the details of structure may be more easily seen.

Fig. 13 is a similar view of some of the parts shown in Fig. 9.

Fig. 14 is a perspective detail of the throw-off lever.

A cylindrical platen 1 is mounted by means of an axle 2 in theends 3 of the platen frame. which frame also includes a rear connecting member 4, which supports the paper tabl 5. A shaft '6 also connects the ends 3 of. the platen frame and acts as a tie-rod and also as a supporting means for a number of parts which will be hereinafter described.

. The rear pressure or feed rolls 7 are mounted at intervals on a shaft 8 extending along the platemsaid shaft being supported by arms 9 which are mounted for swinging" 7 is a detail view of the spring; for I movement on the shaft 6. The forward feed 7 In the embodiment shown, there are two arms 9, one at each side of the platen frame, both arms extending rearwardly to support the roll shaft 8. Arms 12 extendforwardly and inside of the arms 9, and each of the arms 9 and12 may be considered as constituting a pair. For the purpose of holding the pressure or feed rolls against the platen with a yielding pressure, coiled springs 13 are provided, there being one spring for each of the arms 9 and 12, said springs being compressed between lugs carried by the roll-supporting arms and lugs carried by brackets fixedly mounted on the shaft 6.

The arrangement of the arms and the brackets is different for the inside set of arms, that is, the arms 12, from that of the outside set, it being an advantage to have the springs close together sothat they may be readily accessible for adjustment.

Referring to Fig. 8, which shows the extreme right-hand roll-supporting arm 9, said arm is provided with a lug 14 which is bent over toward the left, as viewed in Figs.

5 and 8. or, in other words. toward the center of the platen frame. Adjacent the right side of said arm is a stationary bracket 15, which may be rigidly secured to the shaft 6 by a set screw 16. This bracket carries a lug 17 projecting therefrom, which lug passes under the arm 9 and into such a position that a screw-threaded hole 18 in said lug comes into alinement with a stud 19 secured to or forming part of the lug 14. Threaded into the hole 18 is a screw 20, the reduced end of said screw engaging a cup or washer 21. The compression spring 13 is held in place by-the stud 19, and seats against the washer 21. By moving the screw in or out, the tension of the spring may be readily adjusted. To retain the screw in the position into which it has been set, a spring finger 22 may be provided, said finger being held between the cup 21 and the lug 17 of the bracket,and engaging aflat-sided head on the screw, which head may be in the form of a lock nut. if desired.

The arm 9 is provided with a hub 23 forming a bearing upon which the arm pivots on the shaft 6, and the arm is also provided with a downwardly-projecting lug 24 adapted to engage a depression in the pressureroll release shaft 25, which shaft is rocked by a throw-off lever, the particular construction of which will be hereinafterdescribed. It will'be seen that the arm 9 and the lug 24 are substantially parts of a flat plate mounted on one end of hub 23 and forming a head therefore The hub and the spring are in substantially the same vertical plane, so that the pressure of the spring has no tendency to skew the arm on the shaft which would tend to increase the friction of the arm during its rocking movement.

The arm 12 immediately adjacent and to theleft of the arm 9, shown in Fig. 8, is likewise provided with a hub 25" forming a bearing for the arm. Likewise the arm is provided with a lug 26, which lug has a screw-threaded hole similar to that in the lug 17. This lug projects to the left of the plane of the arm as viewed in Figs. 9 and 13, the hole in said lug being in alinement with a spring-retaining stud 27 formed on a bracket 28, which bracket may be fastened to the shaft 6 by means of a set screw 29. Spring 13 is compressed between the stud 27 of the lug 30 of the bracket 28, and the lug 26' projecting from the arm 12 in the same manner as has already been described with respect to the arm 9. The bracket 28 being stationary, the pressure of the spring 13 is exerted to move the arm 12 in an anti-clockwise direction, while the spring connected to the arm 9 tends to move said arm in a clockwise direction, thereby holding the rolls carried by said arms in yielding contact with the platen.

The right face of the arm 12. as viewed in Figs. 9 and 13, is in contact with the hub of the arm 9, the lugs 26 and 30 being in the plane of the hub 25 so that the spring associated with the arm 12 likewise exerts its pressure evenly. The arm 12 has a projecting lug 31 in the same plane therewith, said lug similar to the lug 24, but projecting on the opposite side of the shaft 25 from that of the lug 24, said shaft being flattened in the region of each of the lugs 24 and 31 so that when said shaft is rocked both arms are moved downwardly to release the pressure rolls from the platen. The lugs 24 and 31. are in the same vertical plane as the respective arms 9 and 12.

- The left-hand pair of arms differs from the right-hand pair just described, in that the lug 1.4 of the arm 9 projects toward the right, the lug of the corresponding bracket projecting toward the left so as to properly aline with the stud carried by the lug 14. so as to properly support the spring in vertical position. Similarly, the lug 26 of the arm 12 of the left-hand pair of arms extends to the right, as clearly shown in Fig. 5, the

lug 30 ofits associated bracket extending to theileft.

The release shaft 25 is supported by hangers from the shaft 6, and is provided at its right hand end with a bent portion to which is fastened a link 33 secured at its upper endto a member 34 of the throw-off leyer. This throw-off lever is preferably formed of a single piece of sheet-metal, bent as shown in Fig. 14, and having a member 35 parallel to the member 34, the two members being connected by across-piece 86, member 35 being also provided with a bentover finger-engaging portion 37, whereby the lever may be manipulated to throw off the pressure rolls. The members 34 and have alined openings 38 and 39, the opening 38 being larger than the opening 39, and adapted to engage over a stud it). A screw 41 is adapted to be passed through the opening 39 and into the stud 40 to hold the lever in place, a spring 412 being provided and being of such length that it is compressed between a shoulder e3 of the stud 10 and the inside portion of the lever member when the screw is seated, as will be readily ap parent from Fig. Any slight looseness of the parts is taken up by the spring, and consequently there is no rattle of the lever during the operation of the typewriter.

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, 1 claim:

1 In a typewriting machine, in combination, a platen, front and rear feed-rolls to cooperate therewith, shafts for said rolls. a supporting bar, supporting arms for said shaft-s, said arms being associated in pairs. each pair including an arm for each of said shafts, the arms of each pair having hubs journaled end to end on said supporting bar and extending from said arms in the same direction along said bar, so that one of said hubs serves to maintain said arms at the desired distance apart, a lug on each arm extending therefrom in the same direction as the hub and lying between the planes of its ends, a fixed support paired with each of said lugs, and a spring between each lug and its support tending to move the former relatively to the latter, said springs thereby tending to cause said rolls to be pressed against said platen.

2. 'In a typewriting machine, in combination, a platen, front and rear feed-rolls to cooperate therewith, shafts for said rolls, a supporting bar, supporting arms for said shafts, said arms being associated in pairs, each pair including an arm for each of said shafts, the arms of each pair having hubs journaled end to end on said supporting bar, a lug on each arm, a fined support paired with each of said lugs, a spring be tween each lug and its support tending to move the former relatively to the latter, said springs thereby tending to cause said rolls to be pressed against said platen, an operating arm in fixed relation with each supporting arm, and a feed-roll-releasing device having operating elements to move said operating arms and thereby cause said feed-rolls to be separated from said platen, each of said supporting arms, its operating arm, its spring and the retaining lugs there for lying within the planes of the ends of its hub.

3. In a typewriting machine, in combination, a platen, front and rear feed-rolls to cooperate therewith, shafts for said rolls, a

supporting bar, supporting arms for said shafts, said arms being associated in pairs, each pair including an arm for each of said shafts, the arms of each pair having hubs journaled end to end on said supporting bar, pairs of sleeves fixed to said supporting bar, the sleeves of each pair being located at opposite ends of the corresponding pair of hubs, so as to constitute end stops therefor, a lug on eacharm, an opposing lug on each sleeve, and a spring between ach pair of opposing lugs tending to move the arm-supported lug relatively to the other, said springs thereby tending to cause said rolls to be pressed against said platen, the hub portions of the arms of each pair being extended axially in the same direction along saidsuppoiting bar, and the springretaining lugs carried by said arms being so located as to lie within the planes of the respective hub-ends.

l. In a typewriting machine, in combinzv tion, a platen, front and rear feedrolls to moperate therewith, shafts for said rolls, a tupporting bar parallel with and equally distant from each shaft, supporting arms for said shafts, said arms being associated in pairs, each pair including an arm for each of said shafts, the arms of each pair having hubs journaled end to end on said supporting bar, pairs of sleeves fixed to said supporting bar, the sleeves of each pair being located at opposite ends of the corresponding pair of hubs, so as to constitute end stops therefor, a lug on each arm, an opposing lug on each sleeve, and a spring between each pair of opposing lugs tending to move the arm-supported lug relatively to the other, said lugs and springs being located at the same side of said supporting bar, with the two lugs for the spring for each pair of arms positioned one above the other, one having the arm-supported lug uppermost and the other having the sleevesupported lug uppermost, so that each spring will tend to cause any feed-roll affected thereby to be pressed against saidplaten,

the hub portions of the arms'of each pair being extended axially in the same direction along said supporting bar, and the spring-retaining lugs carried by said arms being so located as to lie within the planes of the respective hub-ends.

5. In a typewriting machine, in combination, a platen front and rear feed-rolls to cooperate therewith, shafts for said rolls, a supporting bar, supporting arms for said shafts, said arms being associated in pairs, each pair including an arm for each of said shafts, the arms of each pair having hubs journaled end to end on said supporting bar, pairs of sleeves fixed to said supporting bar, the sleeves of each pair being located at opposite ends of the corresponding pair of hubs, so as to constitute end stops therefor, a

lug on each arm, an opposing lug on each sleeve, a spring between each pair of opposing lugs tending to move the arm-supported lug relatively to the other, said springs thereby tending to cause said rolls to be pressed against said platen, an operating arm in fixed relation with each supporting arm, and a. feed-roll-releasing device having operating elements to move said operating arms and thereby cause said feed-rolls to be separated from said platen, each of said supporting arms, its operating arm, its spring and the retaining lugs therefor lying within the planes of the ends of its hub.

6. A typewriter feed-roll-supporting element comprising a hub and a plate-like head at one end thereof comprising a supporting arm extending radially from the hub, an operating arm extending radially therefrom at a different angle to enable the edge of the operating arm to be engaged by an actuating member, and a spring-retaining lug extending from the side of said head from which said hub projects, said arms and said lug lying wholly within the planes of the ends of said hub.

7. A typewriter feed-roll-mounting comprising, in combination, a rocker arm having a lug thereon, a fixed support having an opposing lug thereon, a pair of opposed springretaining elements, one for each of said lugs, an adjustable mounting means for one of said spring-retaining elements comprising an adjusting screw threaded through its supporting lug, said screw having at its inner end a reduced portion and an intermediate shoulder, and having a polygonal head at its outer end, the adjustably-mounted spring-retaining element having an opening to engage the reduced end of said screw, a spring confined between said opposed retaining elements, and a spring-clip to prevent accidental rotation of said adjusting screw, said clip comprising a base portion engaging the reduced end thereof between said shoulder and the adjacent spring-retaining element, a spring-finger to yieldingly engage the surface of said polygonal screw-head,

and a connecting portion in snug engagement with a surface of said lug, so as to permit endwise movement of said clip with said screw during adjustment, but preventing movement thereof about its axis.

8. In a typewriter feed-ro-ll-release mechanism, in combination, a supporting stud having a reduced end portion and an intermediate shoulder, a one-piece lever having spaced bearing portions, said portions being perforated, one to fit the body portion of said stud, and the other to fit the reduced end portion, a fastening member secured at the end of the reduced end portion of said stud to retain said lever thereon, and a spring coiled about the reduced end portion of said stud with its ends confined between said shoulder and the bearing portion of said lever perforated to fit the reduced end portion of said stud.

9. In a typewriting machine, in combination, a platen-frame comprising an end hav ing an outwardlyextending flange, a supporting stud attached to said end beneath the flange, said stud having a substantially cylindrical body portion, and a substantially cylindrical end portion of reduced cross-section extending beyond the edge of said flange, a one-piece lever having spaced bearing portions, one being perforated to fit the body portion of the stud and the other to fit the reduced end portion, said lever also being provided with an arm for manual operation extending from the bearing adapted to fit the reduced end portions across said flange, a helical spring on the reduced portion of said stud and normally compressed between the shoulder formed by the body portion of the stud, and the outer bearing portion of said lever, and means at the outer end of said reduced portion to engage the adjacent bearing portion of the lever and hold it on the reduced portion of the stud.

\VILLIAM F. HELMOND.

lVitnesses JOHN J. BASKERVILLE, FRANK LowE.

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