US2582783A - Sheet feeding mechanism for typewriters or like machines - Google Patents

Description

Jan. 15, 1952 J. F. KLOSKI 2,582,783

SHEET FEEDING MECHANISM F OR TYPEWRITERS OR LIKE MACHINES Filed Sept. 29, 1950 2 SHEETS-SHEET 1 INVENTOR JOHN E If L06 I BY flwm YMW A? ATTORNEYS Jan. 15, 1952 J, os 2,582,783

SHEET FEEDING-MECHANISM FOR TYPEWRITERS OR LIKE MACHINES Filed Sept. 29, 1950 2 SHEETS-SHEET 2 INVENTCR JOHN F ffLOS/f/ BY MMv M A TolNEYs Patented Jan. 15, 1952 SHEET FEEDING MECHANISM FOR TYPE- WRITERS OR LIKE MACHINES John F; Kloski, Hartford, Conn., assignor to Royal Typewriter; Company, Inc., New York, N. Y., av corporation of New York Application September 29, 1950', Serial No. 187,588

This invention relates to sheet feeding' mecha-* nism for typewriters and like machines and more particularly to improved pressure roll adjusting mechanism, and paper pan construction, and to a cc-ordinated combination of such constructions.

Conventional typewriters of the kind including a rotatable sheet feeding cylindrical platen cus toniarilyinclude apaper pan extending under and circumferentially with respect to the platen for guiding and holding work sheet material against the platen, and pressure rolls engaging the work sheets for pressing them against; the platen. While many' such prior constructionshave been generally satisfactory in operation, specific difiiculties sometimes are encountered with respect to creeping of the: work sheets lengthwise of' the platenwith consequent: wrinkling due to the slack in the worksheets between the feed pressure rollers, sometimes even causing the work sheets to tear and to become misaligned with the platen.

An object of the present inventionis toprovide an improved construction of pressure roll ad justing mechanism and paper pan, so co-ordi nated with each other and with the sheet feeding platen as to eliminate or reduce such difliculties to a minimum.

Another object of the invention is to provide an improved pressure roll adjusting mechanism.

A further object of the invention is to provide an improved paper pan construction.

Other objects of the invention will become apparent from a reading of the following descrip tion, the appended claims and the accompanying drawings inwhich:

Figure 1 is a vertical sectional view; fore: and aft of a typewriter carriage; with some parts shown in elevation, certain conventional parts", not necessary to illustrate in order to convey an understanding of the invention, being omi-tteci;

Figure. 2: is a developed. or flattened or unfolded view of a paper" pan construction;

Figure 3 is a fragmentary detailed section on, the line 3-3 of Figure 2, drawn on an enlarged; scale;

Figure 4 is a: fragmentary detailed sectional view on the liru=.-.4--4 of Figure 2', drawn on a more enlarged'scale;

Figure 5 is a fragmentary sectional view on the. line 5--5'of Figure 2, also drawn on an enlarged scale, and showing thev attachment of paper pan to a part of a carriage frame cross bar;

Figure 6 is a view similar to Figure l', but drawn on an enlarged scale, and in section on the line 6-6 of Figure '7, showing work sheet mate 12 Claims; Cl. 197-138) rial operatively associated with a paper pan, feed and pressure roll equipment, and cylindrical platen;

Figure '7 is a section on the irregular line 1--'l of Figure 6', drawn ona reduced scale, and showing some parts in elevation;

Figure 8 is a view partly in front elevation and partly in vertical section of the structure shown in Figure: '7: with some parts omitted, drawn on an enlarged scale as compared to Figure'l; and

Figure; 9 is a. detailed sectional view: on the line 99' of, Figure 8.

The invention may be; embodied in: typewriters or like machines of different constructions. For thepurposes of illustration it is shown as being incorporated in a standard. or office typewriter having some of the: conventional parts. custom arily included. in the: Royal. Standard typewriter. Among the known parts shown is a. cylindrical platen A journalled by suitable: bearings (not shown) on end platesl and 2 of acarriageiramegenerally designated. B. The. carriage'frame. B includes a carriage rail3, adapted'to be supported by and. to roll on balls 4xwhich=in turn: are supported by and rollon a 5, supported on: a" stationary" main: frame. As in other typewriters of the: kind referred to; for example asshown'in the patent to UtzzNo. 1,428,569, a feed roll 6, pressure rolls 1 andr'l', and a. paper pan generally designated 8 are provided for guiding and assist.- ing: in the: feeding of. work sheet material C into operative relation to the platen A. A plurality of top sheet positioning rolls, one of' whichv is shown at 9 in Figure lrmay becarriied ona bail (not shown) for-holding work sheets against the front of the platen. As so far described, the illustrated: construction is conventional. The invention residesin the improved construction, of the: paper pan 8, an improved construction for adjusting the: pressure rolls 1 and 'l", and theco-= relative arrangement of these improved constructions with respect to. each other and. w-ith.respect to the conventional parts.

The paper panconstruction 8 comprises,v generally, two relatively rigid pan sections In: and H which are resiliently or flexibly connected together along a. joint. extending parallel to: the platen axis, and, in: the form shown, somewhat below andto the rear of this: axis. The rear section (0 is generally of flatv plate-like form, and

has. spaced apertures 12, the walls of which are depressed to. form conical projections adapted to fit in depressions 13 formed in. across bar [4 secured to the carriage end plates in the. usual manner. Screws I5, passing through the apertures 3 I2 and having threaded connection with the cross bar I4, secure the rear pan section III to the carriage frame cross bar I4. The pan section I is formed with a front or lower edge lip I6 and is cut out or recessed longitudinally and centrally as at I1.

The front pan section II is curved to lie circumferentially adjacent and under the platen A. The front edge of the section I I is recessed at I8, I8 to accommodate the pressure rolls 1 and 1, respectively. A rear edge recess I9 formed in the front pan section I I registers with the recess I1 in the pan section I!) to accommodate the pressure roll 6. As shown most clearly in Figure 3, the pan section II is formed with offset edge extension portions which overlap the space in the joint between the pan sections Ill and I I.

Although the pan sections I0 and I I are, themselves, relatively rigid, they are so connected at their joint that the front pan section II can yield or flex bodily about the joint. In accordance with the invention, the connection between the pan sections comprises spring leaves generally designated 2 I, one preferably being at each end of the pan structure, and each including a bowed, resilient part 2I spanning the space between the sections I0 and II at their joint, and end tab or attaching parts 2I The tab parts 2I are apertured to receive material of the pan parts which is swedged or deformed as shown at 22 in Figure 4 so as to provide, in effect, rivets unitary with the pan sections and securing the latter firmly to the connecting device 2 I.

The pan structure thus formed, and comprising the sections I 0 and I I, and the connectors 2I, is unitary but is intermediately flexible along a joint extending parallel to the platen axis, the arrangement being such that, although the upper or rear section I0 is fixed to the frame cross bar I4, the front or bottom section can flex substantially bodily about its joint so that its position relative to the platen may be varied in accordance with the thickness of the work sheet material between the pan structure and the platen, and so as to exert variable pressures on the work sheet material, the pressure in each, case being that most conducive to effecting straight feeding of the Work sheet material without buckling, shifting, or cramping of the sheets. Because of the unitary construction of the paper pan, and the particular characteristics of the spring leaf connectors '2I, involving no pivots or other parts subject to wear or binding, the flexing characteristics of the pan structure will remain constant.

The feed roller 6 is journalled on a shaft 23 carried by arms 24, 24', pivotally mounted respectively on cars on the cross bar I4, one ear being shown at 25in Figures 1 and 6. Springs, one of which is shown at 26 in Figures 1 and 6, bear against the rear edges of the arms 24, 24 so as to urge the arms clockwise, as viewed in Figures 1 and 6, and press the feed roller 6 against the work sheet material C extending under the platen A. To enable the feed roll 6 to be released, that is moved away from the platen against the urge of the springs 26, to facilitate insertion of work sheets, a shaft 21 is rockably mounted at 28 in bracket 29 carried by the carriage rail 3 as shown in Figure 7, and is similarly mounted at its opposite end, not shown. Each arm 24, 24 isextended downwardly and forwardly beyond the shaft 23 to provide finger parts 30 which are received in recesses 3I formed in the shaft 21. Normally, when the parts are in the positions shown in Figures 1, 6 and 7, the fiat bottoms of the recesses 3| are aligned with the arm finger extensions 39, and are spaced from the fingers so as to enable the arms '24 and 24' to be urged clockwise by the springs 26 without being restrained by the shaft 21. When it is desired to move the feed roll 6 rearwardly, the shaft 21 is rocked by any suitable mechanism so as to cause the bottoms of the recesses 3I to press against the fingers 30, and thereby rock the arms 24 and 24' counterclockwise against the urge of the springs 26. The mechanism for rocking the shaft 21 may be of any suitable kind, for example such as the mechanism shown in the patents to Hess Nos. 1,100,301 and 1,270,292; or in the patent to Schwartz No. 1,270,979.

The front pressure rolls I, 1' are journalled by self-oiling bearings 32 on a shaft 33 carried by spaced arms 34, 34', rockable respectively on short shafts 35 and 35, secured to the carriage rail 3. 35 fits in a recess 36 formed in the carriage rail 3, and is held in place by a retaining plate 31 secured to the rail 3 by a screw 38. The retaining plate 31 is formed with a flange 39 which projects into a slot 40 in the carriage rail 3, the plate 31 being thus accurately positioned on the rail 3. The shaft 35 is mounted in a recess similar to the recess 36 in the rail 3, and is held in place by a plate 31' secured to the rail 3' by a screw 38', the plate 31 having a flange 39 extending into a slot 40' in the carriage rail. The carriage rail 3 is formed with transversely extending slots M and M traversed by the shafts 35 and 35 respectively, and in which the arms 34 and 34' are mounted, the sides of the slots 4| and M providing lateral support for the arms 34 and 34'.

In accordance with the invention, separate and independently adjustable mechanisms D, D of improved construction are provided for urging the arms 34 and 34' to rock clockwise as viewed in Figures 1 and 6, so as to cause the rolls 1 and 1' to press against work sheet material extending under and in front of the platen A. The mechanism D comprises a two-armed lever 42 mounted to rock on a pivot screw 43, the axis of which is transverse to the platen axis. One arm 44 of the two-armed lever 42 is formed with a rounded edge which projects under and is in contact with the arm 34 supporting the shaft 33. The other arm 45 of the lever 42 is apertured for connection to one end of a spring 46, the other I end of which is connected to a spring anchor 41 in the form of a two-armed lever pivoted on a screw 48 to rock about an axis transverse to the axis of the screw 43. As shown in Figure 7, one.

tion with an ear 52 extending upwardly from the carriage rail 3.

In order to increase the tendency of the spring 43 to rock the associated arm 34 so as to cause the roll 1 to press against the work sheet material with increased force, the adjusting screw 5| is turned to rock the spring anchor lever 41 counterclockwise as viewed in Figure 7, thereby imposing additional loading or tension on the spring 46. This causes the two-armed lever 42 to press upwardly against the arm 34 so as to cause the roll 1 to exert increased pressure on the work,

In the form shown, the shaft.

assessor backed ofiso: as. to permitthespri-ng; anchorlevm.

4:1 to: be: rocked clockwise: as; viewed Fi ure; 7, thus reducing the loading on the, springs; in. V Theseparateadjusting" means D is similar to: the;mechanismdescribed above so theta detailed description of mechanism. D.- will not be. 1132:- essary; Corresponding, parts of" the mechanisms: D: and D are designated by corresponding refer:-* ence numerals with: the exception. that thosedesignating; parts. or the mechanism D are primed Thus.- the; mechanism, D has a two. armed. lever 42.: corresponding to; the. two-armed. lever 42: oi. the: mecha-nismD; the mechanism D5 hasa spring; 4.6 corresponding to the; spring 45: at themeohanism D, and so on.

Conversely; in. order; to. reduce;

relativelytoward said. platen: for pressing; work sheet; material against said platen; andv adjust In order. that the; pressure rolls l and 1- may be: retracted so; as to permit work. sheets to be inserted between the rolls and l and the: platen. A-, ,the arms 34 and 3.4: are. formed. with. GXtQII? sions 53 and 53 which normally extend freely inte slots. 54 and 54; formed in the shaft. 21... When the shaft 21 is rocked for releasing or retracting the feed roll 6, the-bottoms of the slots Mand- 54 willpressagainst the. arm extensions 53 andli to. rock the arms. 34 and 34. counterclockwise as;

viewed in Figures. 1 and 6, thereby moving. the

rolls I and l away from the platen.

By adjusting or varying the pressures exerted by the rolls 1 and 1' and by co-ordinating; this adjustment with the pressure exerted by the seetion H of the paper pan. construction, it ispossi ble. to cause the: work sheet. material to hugv the platen it so. evenly thatthe difficulties due to tortion. and. wrinklingof. work sheet mater a-l usually encounteredin. using prior. machines, are largely eliminated.

The construction disclosed. embodies.- their vention. in its preferred form but it. is intended that the disclosure be. illustrative rather than definitive of the. invention. The invention is do fined. in, the. appended claims.

I claim:

1.. In a typewriter or like machine, a frame; a. cylindrical platen journalled on said, frameior rotary paper feeding movements; a pressure roll; a support pivotally mounted. on said frame. to rock about an axis. parallel to-the platen. axis. and. journalling. said pressure roll with its axis parallel to the platen. axis and for movement. relatively toward said platen for pressing work sheet mate-- rial. against. said platen; and adjustable means for. urging said roll toward said platen to exert. selected: different pressures thereagainst, inclu.d ing a two-armed lever pivoted on said tram-etcrock about an. axis transverse to the axis oi rook-- ing. of said support and. having one: ofits armsextending adjacent toand, inoontaet with; a part ofsaid. support, a coil; springrconneeted at:- enact its ends-to the other armof. said lever and urging. said lever to rock to cause said. one or. saidarms to bear against, said. partoi said support, a spring. anchor movably mounted on. said. irame andtowhich the other end of said spring isconnected, anda. device for changing, the. position of said anchor. on said frame with respectv to, said lever for thereby varying the loading; of saidspring 2,. In. a typewriter or like machine, a frame. a. cylindrical platen. jcurnalled on said- =framefor; rotary paper feeding. movements; at pressure roll; a. support pivotally mounted, on said frame. to. rock. about. an axis parallelv to, the platen axis and. journalling. said pressure roll. with. its. axis parallel to. the platen axis. and. for. movement able means for ur in said roll toward said. platen to. exertselected difierent pressures thereagainsh including: a; two-armed lever pivoted on; said framev to rock about; an. axis; transverse. to the axis of rocking; of said support and having one of its, arms. extending: adjacent to; and in. contact. with apart of. said support, a coil. spring:

. connected at one. of its.- ends to the. other arm of said lever and urging said leverto rock; to cause, said. one; of said arms to bear against said part; of; said support, a spring anchor lever pivotally mounted. onsaid. frame and. to which the.- other: endof said spring. is. connected, and a device for.

rocking saidanchor lever aboutzitspivotz to. vary" the-loading of said spring.

3.; In a typewriter orlike machine, a frame; acy li-ndrical' platen. journalled on said frame for rotary paper feeding,- movements; a pressure roll; asupport: pivotally'mounted on said frame torocl: about; an. axis. parallel to. the platen axis and jgournallingisaid. pressure roll with its axisparalleli to; the:.platen axis and for movementv relatively toward. said platen; for pressing worksheet material. against, said platen; and. adjustable. means: for; urging" said roll toward said platen .to exert selected. different pressures thereagainst, including a two-armed lever pivoted on said frame to. rock about. an axis. transverse. to the axis-0f rocking of: said support and having one of its armsv extending adjacent: to. and in contact with a part of said-support, a. coil spring connected: at one of its ends; to. the; other arm of said lever and urging: said. leverto.' rock" to cause said one of said arms ta'bear againstxsaid part. of said support, a two.- armed spring anchor lever pivotallymounted on. said frame.- and to one arm of which said spring is. connected, and; an adjusting screw mounted.

- on said :frame, engaging the. other arm of said anchor lever, and. being; rotatable for rockingsaid anchor lever to vary the loading of its springt. In. a. typewriter or like machine, a. frame;

a cylindrical. platen journalled. on said frame forrotary paper feeding movements; 2, pressure roll; a: support pivotally mounted on said frame to. rock; about an axisparallel to the. platen axis. and journalling said pressure. roll with. its axis; parallel to; the platen. axis and for movement relatively toward. said platen for pressin work sheet material against said platen; and adjustable means forurging'said rolltoward said, platen to; exert; selected different-pressures thereagainst;

including a two-armed lever pivoted on said frameto. rock about: an axis transverse to the axis of rocking of said. support and having one of its arms formed with a. rounded edge. extending adjacent to and in contact with a part of said support; a coil spring connected at one of its endsto; the other; arm of said lever and urging said. lever to rock; to cause said rounded edge thereof to -bearagainst said part of said support, a. two-armed. spring: anchor lever pivotally mounted on said frame and to one arm of which said. springis: connected, an car on said frame, and: an adjusting;- screw having. threaded connection with said ear; bearing againstv the other arm of said" anchor lever, and being rotatable in said; ear for rocking: said anchor lever to vary the loading of its spring.

5. In a typewriter or like machine, a. frame; a cylindrical platen journalled on saidframe for rotary paper feeding. movements; a rockable support, comprising two arms spaced from each other,

in. the direction of longitudinal extent of the.

platen, and a shaft carried by said arms and extending parallel to the platen axis; a pair of pressure rolls journalled on said shaft in mutually axially spaced relation; means mounting said arms on said frame to rock about an axis parallel to the platen axis for causing said rolls to press work sheet material against said platen; and separately adjustable means operable respectively on said support arms :for urging each of said arms to rock said shaft toward said platen, each of said adjustable means comprising a twoarmed lever pivoted on said frame to rock about an axis transverse to the axis of rocking of the associated support arm, one arm of said twoarmed lever being formed with a rounded edge extending adjacent to and in contact with an edge of the associated support arm, a coi1 spring connected at one of its ends to the other arm of said two-armed lever and urging said lever to rock to cause said rounded edge thereof to bear against said edge of said support arm, a twoarmed spring anchor lever pivotally mounted on said frame and to one arm of which said spring is connected, an ear on said frame, and an adlusting screw having threaded connection with said ear, bearing against the other arm of said anchor lever, and being rotatable in said ear for. rocking said anchor lever to vary the loading of its spring.

6. In a typewriting or like machine, a frame; a cylindrical platen journalled on said frame for rotary paper feeding movements; and means for supporting work sheets and guiding them into engagement with said platen, comprising a first relatively rigid paper pan section, means mounting said pan section on said fame relatively remotely with respect to said platen so that an edge of said pan section extends parallel to the platen axis, a second relatively rigid paper pan section having a part curved to lie circumferentially adjacent said platen and having an edge extending parallel to and adjacent to but spaced from said edge of said first paper pan section, and a plurality of relatively resilient spring leaves, each spanning the space between said edges of said pan sections, and being secured to both of said pan sections, said leaves thereby resiliently mounting said second pan section for bodily movement towards and from said platen.

7. In a typewriting or like machine, a frame; a cylindrical platen journalled on said frame for rotary paper feeding movements; and means for supporting work sheets and guiding them into engagement with said platen comprising a first relatively rigid paper pan section, means mounting said pan section on said frame relatively remotely with respect to said platen so that an edge of said pan section extends parallel to the platen axis, a second relatively rigid paper pan section having a part curved to lie circumferentially adjacent said platen and having an edge extending parallel to and adjacent to but spaced from said edge of said first paper pan section, and a plurality of relatively resilient spring leaves connecting said pan sections together to form a flexible unitary paper pan structure, each of said leaves having a bowed central portion spanning the space between said edges of said sections, and end tab portions secured to the respective pan sections.

8. In a typewriting or like machine, a frame; a cylindrical platen journalled on said frame for rotary paper feeding movements; and means for supporting work sheets and guiding them into engagement with said platen, comprising a first relatively rigid paper pan section, means mounting said pan section on said frame relatively remotely with respect to said platen so that an edge of said pan section extends parallel to the platen axis, a second relatively rigid paper pan section having a part curved to lie circumferentially adjacent said platen and having an edge extending parallel to and adjacent to but spaced from said edge of said first paper pan section, a plurality of relatively resilient spring leaves connecting said pan sections together to form a flexible unitary paper pan structure, each of said leaves having a bowed central portion spanning the space between said edges of said sections, and end tab portions secured to the respective pan sections, and an edge extension portion on one of said pan sections offset from said one of said sections in a direction away from said platen, and projecting across the space between the adjacent edges of said sections, and overlapping the other of said sections on the side thereof remote from said platen.

9. In a typewriter or like machine, a frame; a cylindrical platen journalled on said frame for rotary paper feeding movements; a pressure roll; a support movably mounted on said frame and journalling said pressure roll with its axis parallel to the platen axis and for movement relatively toward said platen for pressing Work sheet material against said platen; adjustable means for urging said roll toward said platen to exert selected different pressures thereagainst, including a two-armed lever pivoted on said frame and having one of its arms in contact with said support, a coil Spring connected at one of its ends to the other arm of said lever, a spring anchor movably mounted on said frame and to which the other end of said spring is connected, and a device for changing the position of said anchor on said frame with respect to said lever for thereby varying the loading of said spring; and means for supporting work sheets and guiding them into engagement with said platen, comprising a first relatively rigid paper pan section, means mounting said pan section on said frame relatively remotely with respect to said platen so that an edge of said pan section extends parallel to the platen axis, a second relatively rigid paper pan section having a part curved to lie circumferentially adjacent said platen and having an edge extending parallel to and adjacent to but spaced from said edge of said first paper pan section, and a plurality of relatively resilient spring leaves, each spanning the space between said edges of said pan sections, and being secured to both of said pan sections, said leaves thereby resiliently mounting said second pan section for bodily movement towards and from said platen.

10. In a typewriter or like machine, a frame; a cylindrical platen journalled on said frame for rotary paper feeding movements; a pressure roll; a support movably mounted on said frame and journalling said pressure roll with its axis parallel to the platen axis and for movement relatively toward said platen for pressing work sheet material against said platen; adjustable means for urging said roll toward said platen to exert selected different pressures thereagainst, including a two-armed lever pivoted on said frame and having one of its arms in contact with said support, a coil spring connected at one of its ends to the other arm of said lever, a spring anchor movably mounted on said frame and to which the other end of said spring is connected, and a device for changing the position of said anchor on said frame with respect to said lever for thereby varying the loading of said spring; a substantially rigid paper pan member curved to lie ciroumferentially adjacent said platen for supporting work sheets and guiding them into engagement with said platen; and resilient means mounting said pan member for movements toward and from said platen and urging said pan member towards said platen.

11. In a typewriting or like machine, a frame; a cylindrical platen journalled on said frame for rotary paper feeding movements; means for supporting work sheets and guiding them into engagement with said platen, comprising a first relatively rigid paper pan section, means mounting said pan section on said frame relatively remotely with respect to said platen so that an edge of said pan section extends parallel to the platen axis, a second relatively rigid paper pan section having a part curved to lie circumferentially adjacent said platen and having an edge extending parallel to and adjacent to but spaced from said edge of said first paper pan section, and a plurality of relatively resilient spring leaves, each spanning the space between said edges of said pan sections, and being secured to both of said pan sections, said leaves thereby resiliently mounting said second pan section for bodily movement towards and from said platen; a pressure roll; and means resiliently urging said pressure roll toward said platen for pressing work sheets against said platen.

12. In a typewriting or like machine, a frame; a cylindrical platen journalled on said frame for rotary paper feeding movements; means for supporting work sheets and guiding them into engagement with said platen, comprising a first relatively rigid paper pan section, means mounting said pan section on said frame relatively remotely with respect to said platen so that an edge of said pan section extends parallel to the platen axis, a second relatively rigid paper pan section having a part curved to lie circumferentially adjacent said platen and having an edge extending parallel to and adjacent to but spaced from said edge of said first paper pan section, and a plurality of relatively resilient spring leaves, each spanning the space between said edges of said pan sections, and being secured to both of said pan sections, said leaves thereby resiliently mounting said second pan section for bodily movement towards and from said platen; a pressure roll; a support movably mounted on said frame and journalling said pressure roll with its axis parallel to the platen axis and for movement relatively toward said platen for pressing work sheet material against said platen; and adjustable means for urging said roll toward said platen to exert selected different pressures thereagainst, including a twoarmed lever pivoted on said frame and having one of its arms in contact with said support, a coil spring connected at one of its ends to the other arm of said lever, a spring anchor movably mounted on said frame and to which the other end of said spring is connected, and a device for changing the position of said anchor on said frame with respect to said lever for thereby varying the loading of said spring.

J OHIN F. KLOSKI.

REFERENCES CITED The following references are of record in the flle of this patent:

UNITED STATES PA'I'ENTS Number Name Date 924,460 Hess June 8, 1909 Armstrong May 1, 1923

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