US2892629A

US2892629A - Sheet feeding device

Info

Publication number: US2892629A
Application number: US691942A
Authority: US
Inventors: Jr Harold A Osgood; Joseph C Pilcher
Original assignee: Sperry Rand Corp
Current assignee: Sperry Corp
Priority date: 1957-10-23
Filing date: 1957-10-23
Publication date: 1959-06-30
Anticipated expiration: 1976-06-30

Description

June 30, 1959 H. A. QsGQoD, JR., ET AL v2,892,629

SHEET FEEDING DEVICE Filed 0G13. 23, 1957 S'SheetS-Sheet l FIG. I

INVENTOR HAROLD A. OSGQOD JR.

y' JOSEPH c. PILCHR B'Y A/mm@ v 'l ATTORNEY June 30, 1959 H. A. osGooD, JR., ET AL 2,892,629

SHEET FEEDING DEVICE Filed Oct. 23, 1957 3 Sheets-Sheet 2 INVENTOR HAROLD A.OSGOOD,JR. JOSEPH C. PILCHER BY M ORNE?y .June 30, 1959 H. A. osGooD, JR., ET AL SHEET FEEDING DEVICE.

3 Sheets-Sheet 3 Filed Oct. 25, 1957 FIGA- NVENTOR HAROLD A. OSGOOQJR. JOSEPH C. PILCHER United States Patent SHEET'FEEDING DEVICE:

Harold A. Osgood, Jr., and Joseph C. Pilcher, Norwalk, Colm., assiguors to Sperry Rand Corporation, New York, N.Y.,.a corporation ofDelaware Application October 23, 1957, Serial No. 691,942

4'Claims. (Cl. 271-39) This invention relates to new' and useful improvements in sheet feedingA devices` and has particular referencel to asimple and eicient device for feeding sheets, one at a time, to a device, such as micro-film` camera where the sheetsor documents are to be photographed.

The main` object of the device is to provide a simple, ei'cient andeconomical device whichl can be detachably associated-with a micro-film camera or similar machine for feeding documents, sheets or cards to the camera, and containing simple and effective means to. prevent more than one sheet at atime being fed to thev camera or other device.

Another objectv of. the. invention is. to so support and move the sheets that there is` no tendency of: the: sheets to be. exed. or moved out. of proper alinement so that they may be fed to` the feed rollers in. perfect relation thereto.

In brief and. general terms, the device.- is adapted to operate on a stack of cards, sheets or documents dis.` posed on edge on tapes and urged forward by a springoperated carrier plate to advance the forward sheet against an initial feed roller which passes the sheet down so that its lower edge is grasped between two. main rollers. It often happens that more than one sheet starts to pass between these two rollersand, it is to prevent this from happening that the invention herein was developed.

Of the two rollers between which the sheetsl pass, the one which contacts the front face of the sheet is positively driven but the other is a retard roller which contacts the rear face of the sheets and is not positively driven but is freely rotatable on a shaft andspring-urgedA to turn in a direction opposite to that of the downward motion of the sheets. This spring-biased roller is mounted onv a bracket which is pivoted and spring-urged to press' the biased roller against the positively driven roller. When only one sheet is passing between these two rollers, then the friction is such as to cause the biased roller to. roll in the direction of motion of the sheet and itsv biasing spring will wind up around its shaft since it is a coiled spring. One end of this spring is connected to a friction clutch member so that after the spring is tightened up beyond a desired amount the clutch will slip. However, when two sheets are disposed between these two rollers, the first sheet bearing against the positively driven roller will be advanced, while the second sheet to the rear of the first sheet will lbe opposed by the bias of. the spring connected to the second or retard roller suiciently to overcome the surface friction between the two sheets so as to hold the second sheet back until the rst. one has passed beyond the two rollers. This action takesr place automatically and the only adjustment required is to adjust the pressure with which the retard roller bears against the positively driven roller.

It is known to provide positively driven retard rollers and to provide ixed retard rollers which swing on their supports to oppose the advance of second sheets but as tar as is known the art does not show a simple freely 2 rotatableiretard" roller biased;A by a coiledspring to resist the forward movement of second sheets in the manner above mentioned.

Another feature of the invention is to support the sheets inclined' edgewise on moving tapes so that the sheets move with the tapesand are not detrimentally affected by friction with any surface along which they might move. Hitherto, especially with thin paper sheets the edgewise friction between the lower edges of thev sheets and the surface along1 which they were moved would cause them to be flexed out of proper alinement which would alfect their proper introduction to; the feed rollers.

A present preferred embodiment of the invention is illustrated in theV drawings of which.

Fig; 1` is a plan view of the device with the cover removed;

Fig.` 2 isa-'vertical front to rear section taken on the line Ziof Fig. 1;

Fig. 3 is a vertical enlarged section of a portion of the mechanism shown in Fig. 2;,

Fig; 4 is an inverted plan View of the device;

Fig; 5 is asomewhat schematicview of the drive mechanism; and

Fig. 6 is an enlarged' partial sectionalview of the means for supporting and adjusting the gate blade.

Referring, now to the particular form of the invention shown in thek drawings, the mechanism is enclosed in a casing' 10 with an open top. A casting is. horizontally disposed: within the casing below the top thereof and has spaced side platforms 1"1 and 12 connected by cross ribs 13 andv 14 at the front and rear thereof. A hollow shaft 15 extends between theseribs and is positioned in center castinglockedin place by avset screw 15.

DisposedV within the shaft 151 (Fig, 6) is arody 18. one end of which extends beyond the open end of the shaft 15 and supports, an L-shaped gate blade 19 connected thereto by a screw 17. The forward edge of this blade to act as a guide to determine an opening through. which cardsv pass, from the tapes and between the gate and a feed. roller later to be described; The other end of the shaft 15 is fitted with a plug 18 apertured to receive a long screw 16 which extends into a threaded opening in theadjacent. end of the rod 18. A spring 16 isdisposed between said plug and` the adjacent end of the rod. The, turning of the screw 16 will move the rod 18 forward or backwardto determine the opening between. the blade and the feed roller. The spring 16 will tendto hold the rod in any adjusted position.

Surrounding the shaft 15 is a bushingZtl which slides thereon. The top surface of this bushing is flat and to it is fixed a carrier plate for the cards 21. which plate hasV a horizontalY portion 22 connected to the bushing 20 by screws 23. The outer ends, of this horizontal portion 22. ride over the upper surface ofthe platforms. 11 and 12. The portion 22 has at, one edge an upwardly and rearwardly extendingpusher plate 24 and against this portion 24 the cardsY 21 rests with their lower edges resting on the tapes 26 and slightly above the flat forms 11 and 12.

With the cards or sheets 2l stackedagains't the carrier plate as shown in Fig. 3. this plate is urged. forward to press the rst card against a pressure roller later described. The horizontal portion 22 of the carrier is.connected by screws 25 to one end of tapes 26 whichY are spaced apartl and extend forwardly to pass over small rollers 27 and then proceed to and are wrapped aroundv a shaft 28- which is-supported between the side walls of thecasing and is. urged by a` spr-ing 29 to exert aconstant pull on; thetapes.-v so as tol continually tend to carry the sheets forwardly.

The. sheets or cards. 21 are engaged atr about their mid-.height by rubber rings. 30 on a roller 31 which is freely rotatable on a fixed shaft 32 supported between the side walls of the casing. Abutting opposite ends of the roller 31 on the shaft 32 are

pulleys

33 and 34. A key 35 on shaft 32 abuts the outer face of the pulley 34 to prevent longitudinal movement of it on shaft 32. A spring 36 at one end bears against the outer face of the pulley 33 and at the other end bears against a collar 37 fixed to the shaft 32. This arrangement'will cause the roller to be rotated with a slip arrangement to turn it without it being positively driven. The

pulleys

33 and 34 are connected by

belts

38 and 39 to

pulleys

40 and 41 respectively fixed to shaft 42. This shaft extends between the side plates of the casing `and is rotated by means later described. f

On this shaft 42 is disposed a pressure rollerl 43 adapted to contact the front face of the sheets 21 as they are moved downwardly by the initial feed roller 31 through the intermediary of the O-rings 30 above mentioned. The previously mentioned gate element 19 is so spaced from the adjacent face of the roller 43 that normally just one sheet or card may pass between it and the roller 43. A curved guide plate 44 is suitably supported from a point adjacent the gate element 19 and around beneath the roller 43 to act as a guide plate to support the sheets as they pass around said roller. There are similarly curved spaced spring strips 45 and 46 atlixed at one end to the shaft 32 and are curved down and around parallel to and above the plate 44 to act as upper guide members. As the cards pass around the roller 43 they are guided forward between driven rollers 47 and idler bearing rollers 48. The rollers 47 are driven as later described at a higher speed so that as the sheets leave the pressure roller 43 they are urged forward more rapidly between the

guide elements

44 and 45 to the entrance of the camera or other device with which the feeding device is associated and which is generally indicated by the numeral 49 in Fig. 2. The rollers 47 are xed to shaft 50 which extends between the side walls of the casing.

The means whereby the various shafts are driven is shown somewhat schematically in Fig. 5. There is a shaft 51 driven by a motor (not shown) and carrying a pulley 52 over which extend two

belts

53 and 54. The belt 53 extends to and around a pulley 55 on shaft 50 to drive the rollers 47, above described. The belt 54 extends to and around a much larger pulley 56 rotatable on a stub shaft 57 and connected thereto is a smaller pulley 58 over which passes a belt `59 which extends to and around a pulley 60 xed to shaft 42 above mentioned. This arrangement of pulleys and belts comprises a reduction drive between the motor shaft 51 and the shaft 42 of the roller 43 and at the same time a direct drive at much higher speed of the rollers 47 to pull the sheets away from the feed rollers into the device 49 which may be a micro-film camera.

The main feature of the device which comprises the invention concerns the means for preventing more than ,4 roller 43 with a greater or lesser pressure as desired. The spring 68 round the stub shaft `62 tends at all times to urge the roller 61 in a direction to oppose the downward movement of the sheets past the roller 43.

The bearing rollers 48 are on a rod 72 which is supported on a at spring plate 73 the other end of which is connected to the cross bar 66 above mentioned. This mounting will tend -to press the bearing rollers 48 upward into contact with the high speed rollers 47 above mentioned.

From the mechanical description of the structure given above, the operation of the device should be clear. When the sheets in the form of cards or other documents are disposed edgewise on the tapes and against the carrier plate they are urged and carried forward by the action of the spring on the tapes which are connected to said plate so that the first card of the stack presses against the driven roller 31 and is fed down to-be .engaged by the positively driven roller 43.V If only one'sheet is thus fed, the opposite face thereof is engaged by the springbiased retard roller 61 and the friction between the sheet and the roller 43 is sutiicient to overcome the retarding action of `the' roller 61. In this instance the roller 61 is turned clockwise against the action of its biasing spring which is then wound up around the shaft. The slip clutch associated with this shaft and the biasing spring will come into play when the spring is wound up beyond a certain amount.

When two sheets perchance pass between the

rollers

43 and 61 then the .friction between these two sheets is much less and the biasing spring comes into play to turn the roller 61 counter-clockwise and hold back the second sheet until-the first sheet has passed beyond the'roller 43.

This action takes place automatically without any action on the part o f the operator except to place the cards in a stack and to adjust the knob 71 to set the tension of the spring 70 so that the pressure of the roller 61 against the roller 43 may be determined in advance. Presumably this advance adjustment will be required in accordance with the character of the sheets being fed through the machine.

While we have described what I consider to be a highly desirable embodiment of our invention, it is obvious that many changes in form could be made without departing from the invention, and we, therefore, do not limit ourselves to the exact form herein shown and described, nor to anything less than the whole of our invention as hereinbefore set forth, and as hereinafter claimed.

What We claim as our invention, is:

1. A sheet feeding device which comprises a platform, a carrier member to move thereover, an upwardly extending plate on said carrier member against which sheets are stacked in a substantially vertical position, tapes connected to said carrier and spring-urged to move said carrier member forwardly, said sheets resting on said tapes one sheet at a time from passing between the rollers. To

this end the pressure roller 43 has associated therewith a retard roller V61 which is freely rotatable on a stub shaft 62 extending between spaced

bracket plates

63 and 64 which are pivotally supported on cross rod 65 extending between the side walls of the casing. A cross bar 66 extends between the

plates

63 and 64 at points intermediate to their ends. The roller 61 is held from lateral motion on the shaft 62 by a stop collar 67 (Fig. 4) and on its other face bears a coiled spring 68 the other end of which is related to a friction clutch device indicated rby the numeral 69.

A coiled spring 70 is wrapped around the cross rod 65 and one end thereof is connected to a knob 71 adjustable on the cross rod by a set screw and the other end of this spring is connected back of the cross bar 66. This arrangement will tend to pivot the

bracket plates

63 and 64 around the cross rod to press the roller 61 against the with their lower edges slightly above the surface of the platform, a roller at one end of the platform and toward which theV sheets are advanced, means to drive the roller to advance the sheets downwardly, a second feed roller below the rst mentioned feed roller to which the sheet is advanced, the second feed roller being positively driven 'to advancethe sheet, and a retard roller adjacent the second feed roller and adapted to press against the rear surface of the'sheet passing the second feed roller, said retard roller being freely rotatable on a shaft, and means connected to the retard roller tending constantly to turn it in opposition to the advance of the sheet.

2. The invention of claim 1 in which there is a coiled spring connected to the retard roller at one end and to the supporting shaft at the other end tending to turn the retard roller in opposition to the advancing sheet.

3. The invention of claim l in which there is a coiled spring connected to the retard roller at one end and to the supporting shaft at the other and tending to turn the retard roller in opposition to the advancing sheet, and a slip clutch between the supporting shaft and the adjacent end of said coiled spring. l

La n

4. The invention of claim 1 in which there is a coiled and an adjustable spring means acting on the bracket to spring connected to the retard roller at one end and to vary the pressure between the two rollers. the supporting shaft at the other and tending to turn the References Cited in the me of this patent retard roller in opposition to the advancing sheet, a slip clutch between the supporting shaft and the adjacent end 5 UNTED STATES PATENTS of said coiled spring, a pivoted bracket on which said sup- 667,394 Ieleld Feb. 5, 1901 porting shaft is mounted to permit movement of the retard 1,085,781 Allen Feb. 3, 1914 roller against the positively driven adjacent feed roller, 2,036,919 Calmes Apr. 7, 1936