Патент USA US2134821код для вставки
Nov. 1, 1938. w. F. HELMOND 2,134,821 TYPEWRITING MACHINE Filed Aug. 15, 1935 2 Sheets-Sheet 1 //7 venfor; Nov. 1, 1938‘ w. F. HELMOND 2, 134,821 TYPEWRITING MACHINE Filed Aug. 15, 1935 2 Sheets-Sheet 2 Patented Nov. 1, 1938 2,134,821 UNITED STATES PATENT OFFICE 2,134,821 ‘TYPEWRITING MACHINE William F. Helmond, West Hartford, Conn., as signor to‘ Underwood Elliott Fisher Company, New York, N. Y., a corporation of Delaware Application August 15, 1935, "Serial 'No. 36,272 14 Claims. This invention relates to the paper-feed or pressure rolls that are associated with the platen roll of a typewriter. A feature of the invention is the provision, in 5 combination with spring-means for the bottom feed-rolls, of novel devices designed to facilitate adjustment of said spring-means ‘to regulate the bottom feed-roll pressure, and to gain other ad vantages. l‘U A further feature of the invention resides in an improved booster-spring device usable at will, as when typing a stiff work-sheet, for applying to the bottom feed-rolls, spring-pressure which is additional to or above the regular spring-pres sure. Two sets of main feed-rolls, front and rear, at the bottom of the platen are carried by means of rocker-arms. The rocker-arms, for each bot tom feed-roll set, are connected by a cross-rod ‘20 spaced from the rocker-arm axis. A draw spring, for pressing the bottom feed-rolls against (01. 197—138) work-piece is to be fed around the platen, an extra or booster-spring device is used and is arranged to apply the extra spring-pressure to .both sets of bottom feed-rolls. To this end a leaf or bar spring spans the aforesaid rocker OI arm-connecting cross-rods to press upon the lat ter. A spring-?exing ?nger may be brought into play manually by means of a handle to bear upon said leaf-spring at a point between said cross-rods and flex said spring, and thereby cause 10 it to put additional spring-pressure upon both sets of bottom feed-rolls by way of said cross~ rods. Withdrawal of said ?nger by means of said handle will remove the extra spring-pressure 15 from the bottom feed-rolls. Said ?nger may be made resiliently yieldable, as by mounting it up on a resiliently yieldable support, for the purpose that when the bottom feed-rolls are cast off, said ?nger, if it be effectively positioned, may yield 20 and ‘thereby obviate excessive flexing of the al the platen, is connected across the cross-rods and is therefore common to both sets of bottom ready flexed booster-spring. feed-rolls. arm-connecting cross-rods intermediately of the One of the rocker-arm-connecting 25 rods is notched by means of a screw-thread pro-, vided thereon. One ‘end of the draw-spring is anchored in and is differentially locatable by means of said screw-thread notches ‘for adjust ing the spring-pressure, and the other end of the 30 draw-spring may be ?xed to the other cross-rod. The draw-spring will be at least tension when it ‘extends squarely across the rocker-arm-con necting cross-rods. By slanting the spring ‘across the cross-rods its tension will be increased. ‘This 35 slanting of the spring, for adjustment of the feed-roll pressure, may be e?ected di?erentially by shifting the screw-thread-engaging end of the spring to different notches as by merely‘d-rawing the spring-end out of one notch of the screw 40 thread and passing it to another notch. The ad justment may also be e?'ected by turning ‘the threaded cross-rod, the thread then acting to move the draw-spring end along the cross-rod, like a nut held against rotation, ‘to slant the 45 spring more or less, depending upon the direction and extent of turning the threaded cross-rod. Additional locking devices are not necessary to maintain the draw-spring in its adjusted-position since the adjustable draw-spring end cannot of 50 itself creep along the thread of the cross-rod, nor can the threaded cross-rod turn of itself since it is frictionally held by the tension of the‘draw spring. For applying more than the regular spring 55 pressure upon the feed-rolls, as when ‘a stiff . The booster-spring may press upon the rocker ends of the latter, so that it may act uniformly 25 upon the bottom feed-rolls. In order that the primary or adjustable draw-spring device may also act uniformly upon the bottom feed-rolls two draw-springs may be used, one beyond each side of the booster or secondary spring device. 30 Other features and advantages will hereinafter appear. .In the accompanying drawings, Figure l is a perspective showing the platen frame of a standard Underwood noiseless type- 35 writer, provided with the present improvements. Figure 2 is a View showing the draw-spring, drawn out of the groove of the threaded an chorage-shaft preparatory to setting the end of the‘ spring into one or another groove for adjust- 40 ment of the ‘spring tension. Figure 3 is similar to Figure 2, but shows the draw-spring seated in one of the grooves. Figure 4 is a sectional side elevation, showing the novel draw-spring-devices, and the feed- 45 rolls in normal positions. Figure 5 is a plan of the platen-frame assem blage, partly broken away, showing the draw spring and booster-spring devices. Figure 6 is a sectional view similar to Figure 4, 50 but shows in addition the booster-spring and how it is ?exed to apply extra pressure to the feed rolls. Figure 7 is a sectional view similar to Figure 6, vbut shows the feed-rolls cast o? from the platen. 55 2 2,134,821 The usual Underwood platen I 0 is journaled by axle II in ends I2, I3, of a platen-frame. Front and rear feed-rolls I4 and I5 run upon the bottom of the platen. platen ID. Type-bars I6 strike the The feed-rolls are thrown on and off the platen by rocking a cam-shaft I1. Novel spring-tension means for the feed-rolls I4 and I5 are applied and adjusted in the fol lowing manner. 10 Tension or draw springs I9 and 20 may be caught at their forward ends in grooves 2| and 22 of a cross-rod 31, which, at its ends, is loosely connected to front feed-roll-carrying rocker arms 23 and 24. These springs tend to lift said 15 arms, and press the front rolls up against the platen. Attached to the rearward end of each of springs I9 and 20 is a clip-hook or eye-piece 25, with an aperture 26 in its rear end. For adjusting the 20 stretch and thereby the tension of the draw springs I9, 20, there has been provided a novel anchorage-shaft or cross-rod 21, which may be rotatively supported in rocker-arms 28, 29, which carry the rear feed-rolls I5. Said shaft 21 has 25 screw-threaded portions to afford notches 30, 3|, by means of which the eye-pieces 25 of the draw springs may be differently spaced, along said shaft 21, from the spring-ends that are ?xed by the grooves 2|, 22. 30 By using a hook 32, as seen in Figure 2, or pliers 33 as in Figure 1, the clips 25 of the springs are withdrawable from the notches 30 and 3|, for shifts to the right or left along the shaft 21, and may be seated in any desired notch 30 or 3|, to 36 slant the springs more or less across the cross rods 21, 31 and thereby regulate their tension. Thus either draw-spring may be adjusted indi vidually, so that adjustment can be effected in the pressure of the front and rear feed-rolls at 40 either the right or left of the roll-system. Since each spring I9, 20 is connected to front and rear roll-carrying arms 23, 24 and 28, 29, it presses the arms upwardly about their pivots, to press the end rolls up against the platen. The springs act together upon the middle rolls I4, I5. The ten sioning of either spring by slanting it more in the described manner, will increase the pressure of the adjacent front and rear end rolls. Thus adjust ment and correction may proceed until all rolls bear equally upon the platen. Or the pressure upon one end of the platen may be made greater than upon the opposite end. Collective or omni bus adjustment may be effected by turning the shaft 21 by means of either of the easily accessible screw-slotted ends 34 or 35. As shaft 21 is turned, the eye-ends 25 of the springs are ad justed by the screw-threads 30, 3| towards or away from the ends ?xed in the grooves 2|, 22 of cross-rod 31, thereby easing or increasing the 60 tension. The screw-threads 30, 3| are shown as being of opposite hands, so that the two springs I9, 20 may slant rightward and leftward for the purpose of neutralizing their end-thrust effects upon the cross-rods 21, 31. Through this uniform collective feed-roll ten sioning, there may always be a balanced or equal ized feed-roll pressure. The universal adjust ment can be effected, whether the original ten sions of the springs 19 and 20 are even or uneven. 70 It will be seen that the two lines of feed-rolls are connected, to move simultaneously into and out of engagement, with the platen and work sheets, This is effected by a feed-roll-release lever, not shown, having connection I8 with the usual cam-shaft I1, which extends along the platen, to control the release and restoration of the feed-roll arms and rolls. It will be seen that a uniform and true tension can be secured on all the rolls; and a properly proportioned feed-roll pressure may be effected. There is provision of right and left individual spring tension; and spring adjustment for nor mal feed-roll setting is secured by moving the eye-pieces 25 into selectable notches 33, 3| on rear anchorage-shaft 21. After the feed-rolls have 10 been normally set to the platen, with either even or uneven pressure, their pressure can be collec tively increased or decreased by turning the dual threaded anchorage-shaft 21 in its bearings in the feed-roll-carrying arms 28, 29 which may also coact with shaft-shoulders, indicated at 46, Fig ure 1, to retain said shaft 21 endwise. Each of the rear feed-roll-carrying arms 28, 29 is pivoted upon a shaft 41 and has a stabilizing hub 46. The carrying arms 23, 24 for the front feed-rolls I4 are also pivoted upon said shaft 41. Said pivoted shaft 41 is supported in brackets 49 on the platen-frame base 40 and is retained against endwise displacement by means of an end head 5| and an end nut 52. The feed-roll-releas ing cam-shaft I1 is also journaled in the brackets 49 and is retained against endwise displacement by a collar 53 and by abutment of the side of a cam-?at-forming notch 54 of said shaft I1 with arm 55 of the front feed-roll-carrying arm 24, the 30 latter in turn abutting one of the brackets 49. For applying extra pressure to the feed-rolls l4, I5, as for thick-card-feeding, a leaf spring 36 is used as a booster-spring and is clipped by means of a curled end 363, Figure 1, to the middle of 36 anchor-shaft 21. The front end of said spring abuts the under side of the front cross-rod 31 midway thereof. This spring 36 may be normally un?exed, Figure 1, for regular feed-roll pressure, or, if extra pressure is desired, it may be ?exed, 40 Figure 6, by means of a ?nger or cam 38, attached to a rock-shaft 4|, journaled in a yieldable sup port 39 adjacent the ?nger 38. Said booster spring-controlling rock-shaft 4| extends beyond the platen-frame end I3 to present a handle 44, 45 and is supported near its handle end by a hanger 42 secured to said platen-frame end by screw 43. The yieldable support 39 constructed of spring metal and fastened to the platen-frame base 40 by a screw 56 forms a resilient arm having its free end curled as at 39a to form the bearing for booster-spring-controlling rock-shaft 4|. Said yieldable support 39 may have on either side of the single screw 56 a downwardly-projecting hold ing tongue 45 engaging the base 40. (2 Q1 Upon casting off the feed-rolls I4, I5, as in Figure 7, the support 39 will yield together with the ?nger 38 if the latter has been operated to flex the booster-spring 36 for extra spring pres— sure. The yielding of the ?nger 38 through its 60 support 39 thus obviates excessive ?exing of the already ?exed booster-spring 36 when the feed rolls are cast off. The rock-shaft 4| may be sufficiently loose in the bearing 39a and in the hanger 42 to permit it to swivel slightly in said hanger 42 in accommodation to the yieldability of said support 39. The rear set of bottom feed rolls has two middle feed-rolls I5, instead of a single middle roll, in order to provide room, be tween said two middle rolls I5, for the booster 70 spring 36. Variations may be resorted to within the scope of the invention, and portionsof the improve ments may be used without others. Having thus described my invention, I claim: 75 2,134,821 3 1. ‘In a typing machine, the combination of a cross-rod connecting each two arms and spaced platen-roll, two feed-rolls spaced circumferen tially of the platen-roll, an individually pressible supporting device for each feed-roll for pressing from the pivot-axis of said arms, one of said and left, respectively, at two sections of its the feed-roll against the platen-roll, a draw spring, and means for connecting said draw length, and two draw-springs connected across I' said cross-rods for pressing said feed-roll sets spring to both feed-roll-supporting devices and for regulating its force to regulate the feed-roll respectively seated, at one end, in the right and pressure, said means including a screw journaled 10 in one of said feed~roll-supporting devices, one end of said spring having a clip holdable by means of the thread of said screw, the othe ' end of said spring being attached to the‘ other feed-roll-sup~ porting device, said clip being withdrawalole from 15 the screw-thread for placement in different notches afforded by the latter to thereby quickly vary the stretch and force of the spring, the stretch and force of the spring also being variable by turning said screw and thereby causing said 20 , clip to move therealong. 2. In a typing machine, the combination of a 'revoluble platen, two feed-roll sets spaced circum ferentially of the platen, an individually pressible, supporting device for each feed~roll set for press~ 26 ing the latter against the platen, spring con» nected across the two feed—roll—su;:-porting devices for pressing both of said feed-roll devices jointly, by spring-?exing pressure applied transversely of said spring at a point intermediate of con~ 30 nections to said feed-roll-supporting devices, and means operable at will for applying and rerlioving said spring-flexing pressure. 3. In a typing machine, the combination of a cross-rods being externally screw-threaded right against said platen, the two draw~springs being left threaded'sections, the other spring ends being anchored to the other cross-rod, said threaded 10 cross~rod being rotatable, whereupon its right and left threads act to variably and oppositely slant said springs across said cross-rods thereby to vary the stretch and tension of said springs for adjusting the feed-roll pressure, the opposite 15 slanting of the springs acting to neutralize the end thrusts induced in the cross-rods by the slanted springs individually. '7. In a typing machine, the combination of a revoluble platen, two feed-roll sets spaced cir 1.20 oumferentially of the platen, supporting means for each feed-roll set to press the latter against the platen, and two draw-springs individually connected across the two supporting means for feed-roll sets for pressing the latter against the platen, said springs having connections whereby they may be adjusted independently to regulate their individual forces for regulating the distribution of feed~roll pressure along the platen, and whereby they may be adjusted jointly to .30 regulate the whole distributed feed-roll pressure. 8. In a typing machine, the combination with the platen-roll, of two feed-roll lines, front and revoluble platen, two feed-roll sets spaced circu1nferentially of the platen, an individually pressible, supporting device for each feed-roll set for press ing the latter‘ against the platen, a spring con rear, near the bottom of the platen, laterally nected across the two feed~roll~supporting devices rod being spaced from its rocker-arm axis, and for pressing both of said feed-roll devices jointly, by spring-?exing pressure applied transversely of a draw-spring connected across the cross-rods and acting to press both lines of feed-rolls against 40 the pie-ten, one of the rocker-arm-connecting said spring at a point intermediate of its connec tions to said feed-roll-supporting devices, and means operable at will for applying and removing said spring-flexing pressure, said two feed-roll supporting devices being movable for withdrawing said feed-roll sets from the platen, and said pres sure-applying means being yieldable to obviate excessive ?exing of said spring when said feed rolls are withdrawn from said platen while said means have been operated to apply said pressure. 4. In a typing machine having a revoluble platen, the combination of a feed-roll co-opera tive with the platen, pivoted arms spaced along the platen for supporting the feed-roll and press" 55 ing it against the platen, an externally screw~ threaded cross-rod connected to and extending between said pivoted arms, a draw-spring for pressing said feed-roll against the platen and having one end seated in the cross-rod thread, 60 said spring extending transversely from the cross rod to anchoring means for its other end, the stretch and force of said spring being adjustable, for regulating the feed-roll pressure, by locating the ?rst draw-spring end diiierently along said 65 cross-rod by means of said screw—thread. 5. The invention as set forth in claim 4, said ?rst draw-spring end being withdrawable from the screw-thread for placement at different points therealong, and said threaded cross-rod being rotatable, thereby to cause said screw-thread to adjust said first spring end therealong. 6. In a typing machine, the combination of a revoluble platen, two feed-roll sets spaced circum ferentially of the platen, two laterally-spaced, 75 pivoted supporting arms for each feed-roll set, a spaced rocker-arms for each line of feed-rolls, “ a cross~rod connecting the rocker-arms that are associated with each line of feed-rolls, each cross cross-rods having spring-end-receiving stations distributed longitudinally thereof, one end of the draw-spring being differentially locatable by means of said stations, to slant the spring differ 45 entially across said cross-rods for adjusting the spring-pressure. 9. In a typing machine, the combination with a platen-roll, of two normally-spring-pressed feed roll lines spaced circumferentially of the platen, 50 a leaf-spring connected across said two feed-roll lines to serve for pressing both feed-roll lines against the platen, and means settable at will to press against said leaf-spring at a place between 55 said feed-roll lines for optionally augmenting the normal~spring-pressure of both feed-roll lines, said set means being restorable at will for re storing the normal feed-roll pressure. 10. In a typing machine having a platen, the combination of a feed-roll, an externally-thread ed rod journaled to extend lengthwise of the feed-roll axis, and a draw-spring having one end anchored and having the other end connected to engage the threads of said rod, said draw-spring 65 acting to press said feed-roll against the platen, the feed-roll pressure being adjustable by chang ing the stretch of said draw-spring by di?er entially locating said other end of the spring along said rod by means of said thread, either by 70 turning said rod for micrometric adjustment of said stretch, or by drawing said other spring-end out of one place of engagement with said threads and shifting it to another place. 11. In a typing machine, the combination of a 75 2,134,821 platen-roll, two feed-rolls spaced circumferen tially of the platen-roll, primary spring-means acting to press said feed-rolls against the platen roll with ordinary pressure, a secondary spring device having means, normally in idle condition for both feed-rolls, for pressing both of said feed justing the tension of said draw-spring supple mentally to the tension-adjustment obtained by retracting said spring-end from one station and replacing it at another station. 13. In a typewriting machine, the combina tion with a platen-roll, of a feed-roll, a struc rolls simultaneously to apply additional spring ture for supporting and pressing said feed-roll pressure jointly to both of said feed-rolls, and against the platen, and a draw-spring having a controller common to said feed-rolls and differ connections enabling it to pull upon said struc ture and in transverse direction of the feed-roll , 10 entially settable at will to put said additional pressure-applying means in effective condition for both feed-rolls, or, conversely, to restore said additional-pressure-applying means to said nor mal idle condition. 12. In a typing machine, the combination with 15 the platen-roll, of two feed-roll lines, front and rear, near the bottom of the platen, laterally spaced rocker-arms, fulcrumed at a suitable axis, for each line of feed-rolls, two cross-rods, one cross-rod connecting the rocker-arms that are associated with one line of feed-rolls, and the other cross-rod connecting the rocker-arms that are associated with the other line of feed-rolls, each cross-rod being spaced from the companion rocker-arm axis, and a draw-spring connected across the cross-rods and acting to press both lines of feed-rolls against the platen, one of the rocker-arm-connecting cross-rods having an ex ternal screw-thread that forms spring-end-re 30 ceiving stations distributed longitudinally there of, one end of the draw-spring being retractable from said screw-thread for quick lateral shift of said end from one station to another, to slant the spring differentially across said cross-rods for adjusting the spring-pressure, said screw-thread ed rod being rotatable for micrometrically ad axis, said connections including a rod having a screw-thread along and by means of which one end of said spring is shiftable laterally to vary the transverse direction in which said spring pulls, and thereby vary its pull to regulate the lo feed-roll pressure effected by said draw-spring. 14. In a typewriting machine or the like, in combination, a structure adapted to be spring forced, an externally-threaded screw-rod, and a spring-device cooperating therewith to spring force said structure, said spring~device includ ing an element having two ends, one end being differentially loca-table, relatively to the other, on and along said rod by means of said screw thread so as to slant said element differentially .113 to said rod and thereby vary the stretch and re sultant force of said spring-device, said ?rst mentioned element-end being adapted to be dis engageable from said screw-thread at will for a quick shift to one or another station along said ' thread, said screw-rod being rotatable to screw shift said ?rst-mentioned element~end along said thread for regulating micrometrically said stretch and force. WILLIAM F. HELMOND.