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Publication numberUS2224137 A
Publication typeGrant
Publication dateDec 10, 1940
Filing dateMay 2, 1938
Priority dateMay 2, 1938
Publication numberUS 2224137 A, US 2224137A, US-A-2224137, US2224137 A, US2224137A
InventorsBreman Frank J, Dell Edward F
Original AssigneeDavidson Mfg Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Friction feeder
US 2224137 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

Dec. 10, 1940. F. J. BREMAN ETAL 2,224,137

FRI CT ION FEEDER Filed May 2, 1938 Patented Dec. 10, 1940 UNITED STATES FRICTION FEEDER Frank .1. Breman, Oak Park, and Edward F. Dell, Park Ridge, 111., assignors to Davidson Manufacturing Company, a corporation of Wisconsin Application May 2, 1938, Serial No. 205,560

24 Claims.

The principal object of this invention is to provide a simple and inexpensive friction feed for sheets of paper, or the like, which virtually assures that only one sheet of material will be fed l; at a time, even though there is considerable variance in the thickness of the stock being fed to the feeder.

Further objects and advantages will become apparent as the disclosure proceeds and the description is read in conjunction with the accompanying drawing, in which Fig. 1 is a diagrammatic view showing an application of the friction feeder of this invention to a printing machine;

Fig. 2 is a fragmentary sectional view taken on the line 2-2 of Fig. 3; I

Fig. 3 is a sectional View taken on the line 3-3 of Fig. 2, with intermittent portions of the struc ture being broken away to conserve space;

Fig. 4 is a fragmentary sectional view taken on the line 4-4 of Fig. 3; and

Figs. 5 and 6 are enlarged views which will be used in explaining the manner in which the feeder prevents more than one sheet from being fed at a time.

A preferred form of the invention has been chosen for illustration and description, in com- 2 other kinds of apparatus, such as folding machines of the buckle type, do not require an intermittent feed so that thelfeeder can be run continuously.

A printing press is indicated diagrammatical ly in Fig. 1 by the reference character Ill, and it comprises a 'printing drum H and a platen l2. Sheets of paper are fed to the press at timed intervals by feeding mechanism, generally designated 13, comprising a feed board i4, separator rolls, generally designated 15, pull-out rolls, generally designated [6, and a conveyor table, generally designated H. The delivery endof the conveying table has associated with it a sheetregistering device, generally designated I8, which receives the sheets from the table I! and delivers them with extreme accuracy into the bite of the printing roll II and platen l2.

The sheet-registering device I8 operates in synchronism with the press 10, and the speed at which the press can operate is partially determined by the ability of the feeding mechanism to deliver sheets to the registering mechanism IS in sufliciently correct timing relationship with the operation of the registering mechanism It! that the latter is given an opportunity to properly perform its function.

Since the sheet-registering mechanism forms no part of the present invention, it is sufficient to state that it functions by having stop fingers l9, associated with the lower feed roll 20, moved to an upright position for a given portion of a cycle of press operation to receiveand end register a sheet delivered to them by the conveyor board ll. As soon as this registry has been accomplished the upper feed roll 2| of the registering mechanism l8 descends to make contact with the lower roller 20, and after the bite has been made the lower roll is automatically rotated to deliver the sheet into the bite of the printing roll H and platen l2. Since this action takes place for each revolution of the printing drum II, it can readily be understood why it is necessary to have the feeder l3 deliver the sheets to the registering mechanism l8 in reasonably correct timed relationship.

The feed table M is suitably mounted on the feeder frame 22, and it is provided with laterally adjustable magazine side walls 23 and 24 so that the pile 25 of fanned-out sheets may be centrally positioned with respect to the feeder mechanism.

The separator rolls l5 comprise a feed roll 26, and a retard roll 21, the former being intermittently driven by a pitman 28, or equivalent means, from the press III, with an overrunning clutch 29 being interposed in the drive so that the pull-out rolls it may draw the sheet being fed by the separator rolls [5 through these rolls, even though the intermittent drive through the pitman has ceased. Theroll 26 is mounted on a shaft 30, to rotate about its own axis, and a clutch 3 I, actuated by a' rod.32, operating through a clutch arm 33, is provided to disengage the feed roll 26 from the drive through the pitman 28.

The retard roll 2'! is rigidly mounted on a shaft 34, provided with eccentric trunnion bearings 35 journaled in the side frames 22 of the feeder. The bearings for the trunnions 35 are so located with respect to the shaft 30 carrying the feed roll 26 that when the retard roll 21 is in substantial flange 39 integral with the side frame 22.

cated at 36 (Fig. 2), the axis of the trunnions 35 is so positioned that rotation of the retard roll 21 in the direction in which the sheet is advancing causes the roll to move forward slightly and away from the feed roll 28, as best shown in Fig. 6, where two sheets of the material being fed are shown in the bite of the'rolls.

The shaft 34 is constantly urged in the opposite direction (that is, in a clockwise direction when viewing the separator rolls as in Fig. 2) by a spring 31, which acts upon the end of an arm 38 rigidly attached to the shaft 34 and a tation of the shaft, however, in the direction in which it is urged by the spring 31 is limited by an adjustable stop 40, which also cooperates with the arm 38, the stop consisting of a. threaded rod 4| passing through the flange 39 on the frame 22, and a similar flange 42, also integral with the frame 22, adjusting nuts 43 being pro-' justed so that the gap '44 between the feed roll 25 and retard roll 21 is slightly less than the thickness of a single sheet of the paper or material being fed to the press. The feed roll 26, being the driven member, makes contact with the top sheet a and tries to drive it through the gap 44, and normally it accomplishes this function without drawing with it the lower sheet b. If, however, sheet b for some reason sticks to the sheet a, it will enter the bite of the separator rolls, as shown in Fig. 6, and the retard roll 21, being free to rotate on its eccentric axis, will move slightly to the left and its center will move a corresponding distance from the center of the feed roll 26 (as indicated by the translation of the normal point of tangency 36). As soon as this movement takes place, the arm 38 is moved away from the stop 40, and the spring 31 continuously urges it back to its normal position, with the result that roll 21 has a clockwise force applied to it (Fig. 6), as indicated by the arrow, while the feed roll 26 continues its rotation to advance the upper sheet a.

It has been found in practice that this ability of the retard roll 21 to yield whenever more than one sheet enters the bite of the separator rolls, and then exert a force which opposes the movement of the second sheet, eflectively prevents more than one sheet from being fed to the pullout rolls l5 at a time, and this is so even when the thickness of the paper stock in the pile 25 varies within wide limits. In this respect the performance of the feeder is exceptional, because heretofore it has always been necessary to make accurate adjustments for different stocks of paper.

As soon as the sheet b ,is restrained from going along with the sheet a as the latter moves toward the pull-out rolls IE, it may, and usually does, remain in thebite of the separator rolls after sheet a has been pulled from those rolls, and it is therefore important that the roll be stopped immediately after the sheet passing to the pull-out rolls has left the separator rolls. This is accomplished in the present invention by continuously urging the shaft 39 axially in a direction to cause the face 46 of the clutch 29 to frictionally engage the friction suri'ace 41, associated with the bearing of the shaft 99 (Fig. 3). The axial thrust of the shaft 39 may be convenientlyactangential contact with the feed roll 26, as indicomplished, by means "of a spring 48, telescoped over the shaft 30 and bearing at one end against the side frame 22 a i at the other end against a collar 49 which may be adjustably positioned on the shaft to obtain the desired thrust. Experience has shown that this friction brake is capable of stopping the feed roll 29 substantially instantaneously when the sheet being moved by the pull-out rolls l9 leaves the bite of the sepaof somewhat harder rubber: grey commercial 1 compound rubber, 78 durometer, having been found satisfactory.-

It is obvious that the retard roll. 21 may take various forms, and may be mounted in numerous other ways without departing from the spirit of this invention. For example, the retard roll 21 may be elliptical in form or ovate, or any other shape, as long as the roll (used in its broadest sense) retains its characteristic function of retarding the extra sheet with which it is in cona1 registry.

The pull-out rolls l5 comprise upper and lower rolls 54 and 55, the latter being formed as a part of the belt roller 5|. The roller 5| is preferably made of wood and is formed with a shallow groove, as indicated at 56 (Fig. 2), which receives'a rubber facing 51 of suitable hardness. The upper roll 54 is preferably a steel roller, and it is carried by a jaw 58, flxed to a rod 59 journaled in the side frames 22. The rod 59 is provided at each end with an arm 50, the end of which is connected to a stud ii on the side frame by a spring 62. The jaw 58 may be fixed to the rod 59 at any desired angular position of the rod 59, by means of a set-screw 63, so that the pressure of the roll 54 on the roll '55 may be conveniently adjusted.

The pressure of the upper roll 54 on the lower roll55 should be suiiicient so that the pull-out rolls l6, which are continuously driven by a belt 64 through the conveyor belts 52, will draw the sheets of material delivered to them through the separator rolls l5, against theaction of the friction brake at the contacting surfaces 46, 41, associated with the shaft 90. This relationship is necessary so that when the trailing edge of a sheet has left the separator rolls IS the shaft 39 will immediately stop rotating.

It is important to note that the feeder mechanism is extremely simple and inexpensive to manufacture as compared with most friction feeders, and one reason for this economy in materials and cost of manufacture is that the sheets are delivered to the press l0 along the center line of the feed mechanism. Heretofore it has been the common practice to guide the sheets alon one side or the other of the conveyor, and to have the separator rolls and pull-out rolls adjustable stock.

In the present invention the magazine sides 23 and 24 are adjustable so as to intially Position the pile 25 in the center of the feed board II, and the only additional adjustment for lateral 5 registry which is necessary is to properly position the side guide 53. No lateral adjustment of the separator rolls l5 or the pullout rolls I6 is necessary or desirable, and because of this fact the lower pull-out roll 55 may be made a part of the 10 belt roller 5 I We claim as our invention:

1. In a friction feeder, a feed table adapted to support a pile of fanned-out sheets, a pair of separator rolls one of which is intermittently driven through an overrunning clutch device, constantly driven pull-out rolls adapted to receive sheets delivered to them by the separator rolls, the other separator roll being non-rotatably mounted on a shaft, eccentric trunnion bearings for the shaft,

yieldable means tending to rotate the shaft in a direction to lessen the distance between the separator rolls, and a stop limiting the rotation of the shaft in that direction.

2. In a friction feeder, a pair of separator mils 28 comprising a feed roll and a retard roll, the former being intermittently driven through'an overrunning clutch device, constantly driven pullout rolls adapted to receive sheets from the separator rolls and pull them from those rolls, the

30 retard roll being yieldingly held in predetermined cooperative relationship with the feed roll but being adapted to move away Slightly from that roll when more than one sheet starts to pass between the separator rolls, and means tending to rotate the retard roll in a direction to oppose forward movement of the sheet with which it is in contact whenever that roll has been moved from its predetermined cooperative relationship with the feed roll.

40 3. In a friction feeder, separator rolls comprising feed and retard rolls normally held yieldingly in predetermined cooperative relationship, an intermittent drive for the feed roll through an overrunning clutch device, driven pull-out rolls adapted to receive sheets from the separator rolls and pull them from those rolls, and means tending to rotate the retard roll in the same direction as the feed roll, to move a sheet rearwardly, whenever the separator rolls have been separated 0 by an amount greater than that required for the passage of a single sheet.

4. In a friction feeder, a feed board adapted to support a pile of fanned out sheets, separator rolls adapted to successively feed the top sheet 5 from the pile to other apparatus, said separator rolls comprising an upper roll driven in a direction to feed the sheets forwardly, a lower roll yieldingly held against rotation at a predetermined distance from the upper roll but being 60 adapted; when it has been moved away from the upper roll by the sheets, to be rotated in a direction to oppose forward movement of the sheet with which it is in contact.

5. In a friction feeder, a pair of separator rolls 65 comprising a feed roll and a retard roll, the former being driven in a direction to advance sheets of material fed to the rolls and the latter being yieldingly held in a predetermined cooperative relationship with the feed roll, and means tend ing to return the retard roll'to its normal position and simultaneously rotate it in a direction to oppose movement of the sheet with which it is in contact whenever the rolls have been moved apart by the entry of more than one sheet with-' 75 in the bite of the rolls. I

6. In a friction feeder, a pair of separator rolls comprising a feed roll and a retard roll, the former being driven to advance the sheet and the latter being substantially non-rotatable, and

means for mounting the retard roll in cooperative 5 relationship with the feed roll so that when more than one sheet enters the bite of the separator rolls the retard roll moves away slightly from the feed roll but is yieldingly urged to its normal position by a force which also tends to rotate 10 the retard roll in a, direction to oppose movement of the sheet with which it is in contact.

'7. In a friction feeder, a pair of separator rolls comprising a feed and a retard roll, the latter being mounted on eccentric hearings in such a 15 manner that when the roll is rotated in the direction of movement of a sheet passing through the rolls the center of the roll moves away a slight distance from the center of, the feed roll, and resilent means tending to rotate the retard 10 roll in the opposite direction.

8. In a friction feeder, a pair of separator rolls comprising a feed roll and'a retard roll, the former being moiuited to rotate on its own center to advance a sheet passing between the rolls and n the latter being rotatable upon an eccentric hearing to move the retard roll away from the feed roll when more than one sheet passes into the bite of the separator rolls, yieldable means tending to oppose rotation of the retard roll in one direction, "30 and a stop for limiting rotation of the retard roll in the opposite direction, thereby fixing the normal distance between the rollers for the feeding of single sheets.

9. In a friction feeder, a pair of separator rolls 35 comprising a feed roll and a retard roll, the former being mounted to rotate on its own center to advance sheets into the bite of the rolls and the latter being substantially non-rotatable and mounted in eccentric bearings positioned so that 4 slight rotation of the retard roll in the direction in which the sheets are advanced causes the retard roll to move away from the feed roll, means constantly urging the retard roll to rotate in a direction to oppose sheet advancement, and an 45 adjustable stop for limiting rotation of the retard roll in that direction.

10. In a friction feeder, a pair of separator rolls comprising a feed roll and a retard roll, the former being intermittently driven through an overrunning clutch device, driven pull-out rolls adapted to receive sheets from the separator rolls and pull them from those rolls, the retard roll being yieldingly held in predetermined cooperative relationship with the feed roll but be- ,55 ing adapted to move away slightly from the feed roll when more than one sheet starts to pass between the separator rolls, and means for instantly stopping rotation of the feed roll as soon as the pull-out rolls have drawn a sheet from the separatonrolls.

11. In combination, apparatus to which sheets are to be fed in predetermined timed relationship,

a friction feeder associated with said apparatus including separator rolls and pull-out rolls, one of the separator rolls being intermittently driven at intervals corresponding to the timed relationship with which sheetsare to be fed to said apparatus, means for continuously driving the pullout rolls, and means for substantially instan-' taneously stopping the rotation of the intermittently driven separator roll as soon as the pullout rolls have drawn a sheet from the separator rolls.

12. In combination, apparatus to which sheets are to be fed in predetermined timed relationship, a friction feeder associated with said apparatus including separator rolls and pull-out rolls, one of the separator rolls being intermit- 5 tently driven at intervals corresponding to the timed relationship with which sheets are to be fed to said apparatus, means for continuously driving the pull-out rolls, and means for substantially instantaneously stopping the rotaton 10 of the intermittently driven separator roll as soon as the pull-out rolls have drawn a sheet from the separator rolls, said last-named means including a friction device applied to the intermittently driven separator roll. A

15 13. In a friction feeder, spaced side frames, a pair of rolls mounted between the side frames comprising upper and lower rolls, the upper roll being rotatable on its own axis, and means for yieldingly supporting the lower roll in prede- 20 termined cooperative relationship with the upper roll, said means comprising a shaft having eccentric trunnion bearings joumaled in the side frame, resilient means tending to rotate the shaft, in a direction to oppose advancement of 25 the sheet with whichthe lower roll is in contact, an arm attached to the shaft, and an adjustable stop cooperating with the arm to limit rotation of the shaft in the direction in which it is urged by the resilient means.

14. In combination, apparatus to which sheets are to be fed at predetermned time intervals and in predetermined lateral registry, a friction feeder associated with the apparatus comprising a feed table, separator rolls centrally positioned 35 with respect to the table, pull-out rolls adjacent to the separator rolls and in alinement therewith, a conveying table for delivering sheets from the pull-out rolls to the apparatus, said conveying table including a side guide adapted to be 40 adjusted through a substantial distance inwardly from the edge of the table and a plurality of conveyor tapes biased toward the side guide, one of the pull-out rolls being a part of the conveying tape roller.

45 15. In a friction feeder, a pair of separator rolls comprising a feed roll and a retard roll, the former being driven in a direction to advance sheets of material fed to the rolls and the latter being yieldingly and normally non-rotatively 60 held in a predetermined cooperative relationship with the feed roll but rotatable when sufiicient force is transmitted thereto by the feed roll through the sheet in contact therewith, and means causing the separator rolls to separate 55 automatically in response to said rotation of the retard roll to a distance apart at which the sheet in contact with the feed roll may be fed thereby with relative freedom but at which the opposition to the passage of sheets not already between 60 the separator rolls is unimpaired.

16. A friction feeder including two separator members, one an advancing roll and the other a retard member adjacent the advancing roll and having a surface extending gradually toward 65 the advancing roll in the direction of movement of the sheets being fed so as to form a bite with the advancing roll, the retard member being so mounted as to permit its surface adjacent the advancing roll to move generally in the direction 70 of the advancing sheets and simultaneously away from the advancing roll, and'yieldable means resisting such movement of the retard member and tending to move it in the opposite direction.

17. In a friction feeder, sheet separating means 15 including two cooperating members one of which has a relatively soft sheet engaging surface and is driven in a direction to advance sheets of material fed to the sheet separating means, and the other of which members has a relatively hard sheet engaging surface and is resiliently urged in a direction that opposes advancement of the sheets by resilient means permitting the said other member to be moved generally in the direction of movement of the sheets by two sheets locked together and the two members to separate slightly under the influence of said movement whereby the pressure between the sheets is automatically reduced for successive positions of the sheet as compared to the pressure that would be present without said movement, until the extra sheet is loosened from the sheet in contact with the driven member and the latter sheet is advanced alone due to the relatively high friction between it and the facing material of the driven member.-

18. A friction feeder including two separator members, one an advancing roll and the other a retard member adjacent the advancing roll and having a surface extending gradually toward the advancing roll in the direction of movement of the sheets being fed so as to form a bite with the advancing roll, the retard member being so mounted as to permit its surface adjacent the advancing roll to move generally in the direction of the advancing sheets, and yieldable means resisting such movement of the retard member and tending to move it in the opposite direction, said separator members being separable'in response to said movement in the direction of the' advancing sheets.

19. A friction feeder including an advancing roll, a retard member having a curved surface adjacent the advancing roll, means for feeding the leading edge of a fanned-out stack of sheets to the bite between the advancing roll and the 40 retard member, means for rotating the advancing roll when a sheet is desired, the retard member being mounted eccentrically to the sheet-engaging surface thereof to rotate as a body about an axis so positioned that movement of the surface with an advancing sheet separates the surface from the advancing roll, and means for yieldingly resisting such rotation.

20. A friction feeder including two separator members, one an advancing roll and the other a retard member adjacent the advancing roll and having a surface extending gradually toward the advancing roll in the direction of movement of the sheets being fed so as to form a bite with the advancing roll, the retard member being so mounted as to permit its surface adjacent the advancing roll to move generally in the direction of the advancing sheets, yieldable means resisting such movement of the retard member and tending to move it in the opposite direction, and means for adjusting the normal minimum spacing between the retard member and the advancing roll for various sheet thicknesses, said separator -members being separable in response to said movement in the direction of the advancing sheets.

21. A friction feeder including an advancing roll, a retard member adjacent the advancing roll, means for feeding the leading edge of a fanned-out stack of sheets to the bite between the advancing roll and the retard member, and means for rotating the advancing roll when a sheet is desired, the retard member being so mounted that its sheet-engaging surface may be moved by the sheets under the influence of the advancing roll with a movement initially approximately in the direction of the sheet movement and being provided with means for opposing said movement, the shapes of the retard member and the advancing roll being such that as the retard member is moved by two or more sheets it will during a short movement squeeze the sheets progressively more tightly against the advancing roll and flex them.

22. A friction feeder including two separator members, one an advancing roll and the other a retard member adjacent the advancing roll and having a surface extending gradually toward the advancing roll in the direction of movement of the sheets being fed so as to form a bite with the advancing roll, the retard member being so mounted as to permit its surface adjacent the advancing roll to move generally in the direction of the advancing sheets and simultaneously away from the advancing roll, yieldable means resisting such movement of the retard member and tending to move it in the opposite direction, and means for adjusting the normal minimum spacing between the retard member and the advancing roll, the retard member engaging the sheets with less retarding force than the advancing force exerted on the sheets by the advancing roll but with enough friction to cause the sheets being moved by the advancing roll to move the surface of the retard member generally in the direction of sheet movement when two sheets stick together.

23. A friction feeder including two separator members, one an advancing roll and the other a retard member adjacent the advancing roll and having a surface extending gradually toward the advancing roll in the direction of movement of the sheets being'fed so as to form a bite with the advancing roll, the retard member being so mounted as to permit its surface adjacent the advancing roll to move generally in the direction of the advancing sheets and simultaneously away from the advancing roll, and yieldable means resisting such movement of the retard member and tending to move it in the opposite direction, the retard member engaging the sheets with less retarding force than the advancing force exerted on the sheets by the advancing roll but with enough friction to cause the sheets being moved by the advancing roll to move the surface of the retard member generally in the direction of sheet movement when two sheets stick together.

24. A friction feeder including two separator members, one an advancing roll and the 0th" a retard roll adjacent the advancing roll a forming a bite with the advancing roll. the retard roll being eccentrically mounted to permit its surface adjacent the advancing roll to move generally in the direction of the advancing sheets and simultaneously away from the advancing roll, yieldable means resisting such movement of $5 the retard roll and means for adjusting the normal minimum spacing between the retard roll and the advancing roll; the retard roll engaging the sheets with less retarding force than the advancing force exerted on the sheets by the advancing roll but enough friction to cause the sheets being moved by the advancing roll to move the surface of the retard roll generally in the direction of sheet movement when two sheets as stick together.

FRANK J. BREMAN. EDWARD F. DELL.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2583506 *Jan 25, 1950Jan 22, 1952Breman Frank JContinuous feeder
US2655374 *Mar 24, 1950Oct 13, 1953Bell & Howell CoAutomatioc sheet feeding mechanism
US2656185 *Mar 17, 1951Oct 20, 1953Pitney Bowes IncOverload drive release
US2670954 *Mar 9, 1951Mar 2, 1954Pitney Bowes IncSheet feed control device
US2705636 *Apr 27, 1951Apr 5, 1955La Bombard Leon EFeed mechanism in paper box machines
US2813714 *Jan 6, 1954Nov 19, 1957Pitney Bowes IncSheet feeding and folding device
US2831676 *Oct 13, 1953Apr 22, 1958Runzi KurtFolding machine
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Classifications
U.S. Classification271/122, 271/37, 271/10.1
International ClassificationB65H3/52
Cooperative ClassificationB65H3/5261
European ClassificationB65H3/52B6B