Патент USA US2297490код для вставки
Sept. 29, 1942. I - H. MARTIN ET AL PAPER GUIDE AND FEED FOR TYPEWRITERS Filed April 7, 1941 2397390 Patented Sept. 29, 1942 2,297,490 UNITED STATES PATENT OFFICE 2,297,490 PAPER GUIDE AND FEED FOR TYPEWRITERS Hans Martin and Leopold Gebert, Erfurt, Ger many; vested in the Alien Property Custodian Application April 7, 1941, Serial No. 387,288 ~ In Germany July 24, 1939 4 Claims. This invention relates to paper carriages of typewriters and the like and particularly to paper guide and feeding devices thereof. It is an object of the invention to provide a paper guide and feed device which will insure the even and exact feed of both thin and thick papers in single or multiple layers. Another object of the invention is to provide a paper guide and feed construction for type writers and the like in which the guide plate or apron which underlies the platen and the feed rollers associated therewith are constructed and assembled as a unit which may be mounted in and removed as such from the paper carriage (Cl. 197-138) ing the levers to release the feed rollers from en gagement with the platen. Other objects and advantages of the invention will be apparent from the following detailed de scription of the invention in relation to the ac companying drawing which illustrates a pre ferred constructional embodiment of the inven tion by way of example. In the drawing: Fig. 1 is a perspective view of the paper guide and feed assembly detached from the carriage, Fig. 2 is a perspective view from above of the paper carriage with the platen and paper guide unit removed, Fig. 3 is a sectional view on the line 3-3 of quickly and easily after the platen is removed, 15 Fig. 2, with the paper guide in operative posi thereby facilitating access to all parts of the car tion in the carriage, riage by a person having little knowledge of type Fig. 4 is a disjointed detail view of the mount— writer construction. ing levers for the feed rollers and guide apron, Another object of the invention is to provide a and paper guide and feed construction which will 20 Fig. 5 is a detail of one of the end bearing sup permit insertion and proper feeding of di?erent ports for the supporting shaft of the paper guide numbers or thicknesses of sheets at opposite sides and rock shaft for releasing the feed rollers. of the carriage at the same time. Referring more particularly to the drawing, in Another object of the invention is to provide a paper carriage in which the paper guide apron 25 which all standard parts not necessary to an understanding of the invention have been omitted, and feed rollers are carried by a single shaft ID indicates a platen roller which is removably adapted to be mounted beneath and parallel to journalled on the paper carriage H in advance the platen whereby the mounting of the shaft of an upstanding paper table [2 mounted there correctly positions the guide and feed rollers in ' the carriage frame and in which a plurality of to on. The paper table I2 is provided with vertical ribs l3 adjacent the ends thereof which facilitate platen engaging feed rollers are mounted on levers passage of the lower edge of the paper onto an carried by said shaft and capable of independent apron M which, in operative position, extends action in accommodating themselves to the thick from the lower portion of the table l2 around ness of the paper fed around the platen. Another object of the invention is to provide a 35 the underside of the platen Hi to guide the paper therearound. ‘The rear portion of the apron I4 is novel mounting connection between the paper dimensioned and curved backwardly to engage the guide apron and the feed roller mounting levers lower portion of the table l2 at the lower ends of wherein the levers are mounted in pairs in op the ribs I3. posed relation on a single shaft and at their outer The guide apron I4 is provided with a row of ends are articulated to the paper guide apron and 40 front apertures l 5 and rear apertures I6 for front in which the feed roller levers are held in posi and rear feed rollers I‘! and I8, respectively, tion on the mounting shaft by springs which serve spaced along the length of the apron, which roll also to rock the levers into position to press the ers contact the platen 10. The apron l4 and feed feed rollers against the platen. rollers I1 and I8 are supported by spaced pairs Another object of the invention is to provide 45 of lever arms l9 and 20 mounted on a shaft 2!. a novel construction and method of mounting the feed roller carrying levers on a single support ing shaft, in which the levers in pairs are pro The front feed rollers ll are mounted on pivot pins 22 which extend through apertures 23 in the ends of the forwardly extending front levers I 9 of each pair and through bracket ears 24 carried vided with oppositely disposed bearing seats open on one side so as to be assembled directly on the 50 by the apron I 4 at the ends of the respective apertures IS. The pins 22 and bracket ears 24 shaft from the side thereof and held in assembled provide an articulated connection between the engagement with the shaft by the springs which ends of the levers l 9 and the front portion of the also press the feed rollers against the platen. apron I4. 7 Another object is to provide means for spread The rear feed rollers 18 are mounted on pivot 2,297,490 2 pins 25 which extend through apertures 25 in the ends of the rearwardly extending rear levers 2|‘) and through slots 21 in bracket ears 28 car ried by the apron M at the ends of the respec tive apertures IS. The pins 25 extending through the slots 2'! in the bracket ears 28 pro vide an articulated connection between the le vers 20 and the rear portion of the apron and the slots 21 are arranged so that the pins can ride therein to permit relative movement be tween the rear feed rollers and the apron, neces sary to effect release of the rollers from the platen as hereinafter described. Referring more patricularly ‘to Figs. 3 and 4, each front lever arm H? is formed with a down wardly opening bearing eye or notch 29 which ?ts the shaft 2| and with a rearwardly extend ing arm 39 having an upstanding stud 3| at its terminus. Each lever arm 2|] is formed with an lease shaft 40 which is already in position. The unit is then tipped back to seat the shaft 2| in the bearing notches 45 of the bearing blocks 42. As the unit reaches this position, the rear edge of the apron l4 engages the lower portion of the table |2 abutting the lower ends of the ribs |3 and it is positioned for cooperation with the platen. The platen H] is then mounted in the carriage, the parts being so disposed that it ; presses against the feed rollers, as will be readily understood. When it is desired to remove the guide for any purpose, such as cleaning or re pairing, the platen is ?rst removed and the guide unit is merely lifted bodily out of the carriage. In the operation of a typewriter or the like equipped with the new paper guide, movement of the release lever 4| to rock the shaft 40 causes an outward movement of the ends of le vers l9 and 2|! and the feed rollers carried there upwardly opening bearing eye or notch 32 which . by away from the platen. This movement is also transmitted to the paper guide apron through ?ts the shaft 2| and with 9. depending stud the bearing ears so that the same also moves 33 disposed in opposed relation to the stud 3| on down, uniformly enlarging the space between it arm 30 of lever l9 when a pair of the levers and the platen. The pin and slot connection are assembled side by side on the shaft 2|. A between the levers 2B and the rear bearing ears coiled compression spring 34 mounted on the of the apron permits equalization of the paths studs 3| and 33 yieldingly rocks the levers in op of motion and spreading of the levers with re posite directions to retain them on the shaft spect to each other, which is necessary to the and to press the feed rollers against the platen. releasing operation. The levers ii] are provided with an upwardly With the unit construction of paper guide and directed, rearwardly extending projecting por- :=~, feed according to this invention, it is possible to tion 35 which bears against the side of the re provide carriage frames of any length with ef spective levers 29 to steady the levers against fective paper guides simply by mounting a plu lateral tipping. The shaft 2| on which the le rality of guide units end to end in the carriage. vers are mounted is formed with spaced annular grooves 36 constituting bearing seats in which 3- This is very important as it avoids the necessity of making up special feed devices for the seldom the levers are seated, the grooves being spaced ordered, extra length carriages. In such car apart the length of the feed rollers and serving riages, each of the guide units has a mounting to prevent lateral displacement of the levers on shaft equivalent in length to the apron section the shaft. For the purpose of releasing the feed rollers 4.. , employed and the respective units may be sep arately removed and installed. However, for from pressure against the platen, the levers l9 convenience in operation, a single release shaft and 20 are provided with forwardly extending extending the full length of the carriage and arms 31 and 38, respectively, which cross each common to all of the guide units is preferably other and are adapted to engage cutaway por used. tions 39 on opposite sides of a release shaft 4% While a preferred constructional embodiment which is provided with a release lever 4! for rock of the invention has been shown and described ing the same. Rocking the shaft til from the by way of illustration, various modi?cations in position shown in Fig. 3 forces the arms 3'! and the details of construction and arrangement of 38 apart and rocks the levers l9 and 2% about the parts may be resorted to without departing the shaft 2| against the pressure of spring 351- to from the spirit of the invention within the scope retract the feed rollers from the platen. of the claims. A plurality of bearing blocks or rests 42, shown We claim: in detail in Fig. 5, are mounted at intervals along 1. In a typewriting machine, a carriage frame, the length of the carriage frame beneath the platen position. These bearing blocks, which 55 a platen removably journalled in said frame, open mouthed bearing seats on said frame beneath may be formed of sheet metal, include an up said platen, a shaft removably seated in said bear standing web 43 provided with a bearing aper ings, spaced pairs of lever members, the lever ture 44 for mounting the release shaft Gil and members of each pair extending forwardly and an upwardly opening bearing notch 65 for seat rearwardly and having opposed open bearing ing the shaft 2|. From the above it will be observed that the 60 notches engaging vopposite sides of said shaft, springs engaging opposed portions of the levers complete paper guide and feeding unit is assem of each pair to urge them into gripping relation bled independently of the carriage frame. In with said shaft, feed rolls journalled between the the assembly, the swinging levers l9 and Eli are respective ends of the lever arms of adjacent ' ?tted on the shaft 2| from opposite sides and, pairs, and a guide apron articulated to the ends of together with a pressure roller for each pair, are the levers and supported thereby, said guide fastened to the bearing ears of the paper guide apron, levers, feed rollers and shaft constituting apron by the pivot pin for the feed rollers, the a unit assembly removable as such from the car bearing ears being disposed between the ends of riage after removal of the platen. the rollers and the ends of the levers. The 70 2. In a typewriter, the combination with a springs 34 are then mounted in position and hold paper carriage having a removable platen and a the levers on the shaft 2|. When all of the le paper table in ?xed relation to said platen, paper vers and feed rollers are thus mounted, the unit guide and feed means comprising a unit assembly is inserted in the carriage frame, the release arms 3'! and 38 being ?rst slipped over the re 75 adapted to be mounted in said carriage beneath 2,297,490 said platen and removable therefrom upon re moval of said platen, said unit assembly compris ing a shaft, front and rear levers arranged in pairs spaced along said shaft and having oppo siitely opening bearing notches engaging said 3 bers, a plurality of spaced pairs of lever mem bers pivotally mounted on said shaft, each pair of lever members comprising a front lever and a rear lever arranged side by side and have op positely disposed bearing notches engaging said shaft from opposite sides thereof, springs coact shaft from opposite sides, a spring coacting be ing between the front and rear levers of each pair tween the levers of each pair and pressing them and pressing them into engagement with said into engagement with said shaft, said shaft hav shaft, feed rollers journalled at the ends of said levers and adapted to bear against said platen, 10 ing annular grooves for seating the bearing por tions of each pair to retain them against lateral and a paper guide apron pivotally connected to displacement, feed rollers journalled at the ends and supported by said front and rear levers; a of the respective lever arms, and a curved guide plurality of open mouthed bearing supports apron pivotally connected at spaced points to mounted in said carriage beneath the platen for seating said shaft, a release shaft journalled in 15 said levers and supported thereby; said paper guide and feed unit being bodily removable from said carriage, an arm on each of said levers for said carriage after removal of said platen; a engaging said release shaft, said paper guide rocking cam release shaft mounted on said frame, apron having a rear edge portion adapted to con arm members carried by said levers for engaging tact a part of said paper table on said carriage when said unit is inserted in said carriage with 20 said cam release shaft when said unit is in opera tive position in said carriage frame to throw said the arms on said- levers engagingsaid release levers away from said platen to release the pres shaft and said ?rst mentioned shaft is seated in sure of the feed rolls therefrom, and means for said bearings to position said paper guide apron rocking said cam release shaft. and feed rollers for cooperation with the platen. 4. A typewriting machine as de?ned in claim 3 3. In a typewriting machine, a paper carriage frame, a platen removably journalled in said 25 in Which one of the levers of each pair is pro vided with a widened ?at bearing portion bearing frame, open mouthed bearing members mounted on the side of the other lever. in said frame beneath the position occupied by the platen; a paper guide and feed unit compris HANS MARTIN. ing a shaft adapted to seat in said bearing mem 30 ‘ LEOPO'LD GE'BERT.