US3224758A

US3224758A - Apparatus for separating conveyed sheets

Info

Publication number: US3224758A
Application number: US163114A
Authority: US
Inventors: Siempelkamp Eugen
Original assignee: Individual
Current assignee: Individual
Priority date: 1960-12-31
Filing date: 1961-12-29
Publication date: 1965-12-21
Anticipated expiration: 1982-12-21
Also published as: DE1166093B

Description

Dec. 21, 1965 E. SIEMPELKAMP APPARATUS FOR SEPARATING CONVEYED SHEETS 4 Sheets-Sheet 1 Filed Dec. 29.

Eugen Siempelkomp INVENTOR.

KM BY AGENT.

4 Sheet s 2 21, 1965 E. SIEMPELKAMP APPARATUS FOR SEPARATING CONVEYED SHEETS Filed Dec. 29, 1961 GENT.

Dec. 21, 1965 SIEMPELKAMP 3,224,758

APPARATUS FOR SEPARATING CONVEYED SHEETS Filed Dec. 29, 1961 4 Sheets-Sheet 3 3 LL r Eugen Siempelkomp INVENTOR.

BY K M K M AGENT.

21, 1955 E. SIEMPELKAMP 3,224,758

APPARATUS FOR SEPARATING GONVEYED SHEETS Filed D90. 29, 1961 4 Sheets-Sheet 4 Eugen Siempelkump INVENTOR.

BY M F. M

AGENT.

United States Patent Ofiice 3,224,758 Patented Dec. 21, 1965 3,224,758 APPARATUS FOR SEPARATING CONVEYED SHEETS Eugen Siempellramp, I-llohenzollernstrasse 69, Krefeld, Germany Filed Dec. 29, 1961, Ser. No. 163,114 Claims priority, application Germany, Dec. 31, 1960, S 71,905 3 Claims. (Cl. 271-64) My present invention relates to an apparatus for conveying sheets of fiberboard and similar composition materials over a path leading from a point of origin to a delivery point in such manner that the spacing of the sheets is greater at the delivery point than at the origin.

In my copending application Ser. No. 835,686, filed August 24, 1959, now Patent No. 3,050,200, I have disclosed an apparatus of this character particularly designed to serve a stacking device adapted to deliver the sheets in superposed position to a multilevel press. The system described in that copending application utilizes a tilted platform onto which the sheets are delivered by a first conveyor and from which they are transported toward their destination by a second conveyor Operating at a higher speed. The sheets, in sliding down the inclined platform, are accelerated from the speed of the incoming conveyor to substantially the speed of the outgoing conveyor so that their separation from one another increases progressively during their descent. In a preferred embodiment, the platform is sWingahle about a horizontal axis adjacent the delivery end of the incoming or primary conveyor so that its lower edges can be selectively aligned with the receiving edges of several outgoing or secondary conveyors to facilitate the distribution of the sheets to difierent levels of a stacking rack served by the last-mentioned conveyors.

It has been found that a system of the character described, while suitable for many types of sheet material, will not be satisfactory if the cohesion of the conveyed sheets is very low. In such instances the sheets sliding down an inclined surface are liable to experience undesirable elongation and even rupture as their forward portions are accelerated while their rear portions are still in contact with the slower-moving incoming conveyor. This is particularly true in installations where the sheets to be conveyed consist of loose particles (e.g., dampened fiber) piled directly upon the principal conveyor and smoothed into layer form without substantial preliminary compression, the resulting layer being then cut at predetermined intervals so as to be divided into a series of discrete sheets which are then successively delivered to the stacking device for consolidation in a multiplaten press.

It is, therefore, an object of my present invention to provide an improved conveying system for the purpose set forth wherein sheets of virtually any degree of coherency can be separated without danger of undue stretching or rupture.

A more specific object of the invention is to provide means in such improved conveying system for selectively delivering the separated sheets to a plurality of outgoing conveyors at different levels for distribution or stacking purposes.

In accordance with an important feature of this invention I provide, between a primary conveyor and one or more secondary conveyors or similar receiving devices, a transit conveyor adapted to be selectively operated at different speeds including a relatively low speed corresponding to that of the primary conveyor and a relatively high speed allowing for an increased separation of the oncoming sheets; if the receiving devices are secondary conveyors, their speed should substantially match the higher operating speed of the transit conveyor. At the same time I provide means for temporarily shifting the junction between the primary and transit conveyors in such manner that a sheet following another sheet already on the transit conveyor will not reach that conveyor until the latter, having accelerated to separate the sheet carried thereon from its successor, has again returned to the lower speed at which the takeover of the following sheet from the primary conveyor is possible without risk of deformation. Thus, the junction between the conveyors is so reciprocated along the plane of conveyor motion that its forward stroke occurs at substantially the operating speed of the primary conveyor whereas its return stroke, occurring at the same or a higher rate while the speed of the transit conveyor drops to its lower value, is timed to come to an end just as a further sheet on the primary conveyor approaches this junction. As the junction recedes, the transit conveyor has slipped under the second sheet and is ready to speed up as soon as the latter is no longer supported by the first conveyor.

The reciprocating displacement of the conveyor junction is most conveniently accomplished by a relative lengthening and foreshortening of the carrying surfaces of the two conveyors with concurrent displacement of the leading edge of the primary conveyor and the trailing edge of the transit conveyor. The displacement stroke will normally be substantially half the length of a sheet or, more generally, half the spacing between successive intersheet gaps at which separation is to occur, it being of course possible to apply the invention to systerns in which groups of successive sheets rather than individual sheets are to be separated from one another.

In order to feed a plurality of superimposed pick-up conveyors acting as the receding devices for the transported goods, the transit conveyor is advantageously so designed, pursuant to another feature of the instant in vention, that its output edge can be selectively aligned with the several pick-up conveyors positioned therebeyond. A convenient guiding system for the band of this conveyor comprises a double-armed lever with a fixed fulcrum and a pair of rollers on the extremities of its two arms, one of these rollers defining the output edge of the conveyor and being selectively positionable at the levels of the associated pick-up conveyors as the lever is swung between a substantially vertical and at least one inclined or horizontal position. The second roller, which preferably is the lower one of the two, bears upon the conveyor band only in the vertical position but extends freely toward the interior of the conveyor loop in the other position or positions. The rollers are advantageously spring-loaded to maintain the band under tension in the several positions of adjustment.

The juxtaposition of two relatively displaceable conveyor members makes it desirable to keep the radius curvature of the conveyor bands along their adjoining edges as small as possible. For structural reasons, however, the bands will generally have to be so heavy as not to flex readily around a roller or other guide element of small radius. A further feature of my invention, therefore, resides in the provision of a conveyor band. composed of a pair of relatively displaceable belts or layers of which the inner one passes around a large-diameter guide roller while the outer one, which may be of substantially reduced thickness since its load-carrying capacity need not be large, embraces another roller of considerably smaller diameter positioned beyond the first-mentioned roller in the immediate vicinity of the adjoining conveyor member. Such an arrangement may be provided, for example, along the displaceable output edge of the transit conveyor in a 3 system adapted for the loading of stacked pick-up conveyors, yet the same arrangement may also be used at the junction of the primary and transit conveyors.

The system herein disclosed may be utilized in a plant in which the sheets are preformed upon being placed on the primary conveyor, as well as in an installation wherein the formation of the sheets occurs on the primary conveyor itself. In either case it will be necessary to maintain, preferably by automatic means, proper synchronism between the advance of the sheets and the reciprocation of the conveyor junction which in turn is tied to the speed changes of the transit conveyor. Such synchronism can be insured by, for example, a feeler adapted to detect the passage of a gap, as first disclosed in my copending application, or by a suitable linkage between the conveyor control and a slicing mechanism which cuts a deposited and smooth layer on the principal conveyor into discrete sheets.

The above and other objects, features and advantages of my invention will become more readily apparent from the accompanying drawing and description thereof.

In the drawing:

FIGS. 1-4 illustrate in side-elevational view, somewhat diagrammatically and with parts broken away, a conveyor system representing a first embodiment of the invention, the system being illustrated in successive operating positions in the several figures;

FIGS. 5-7 are similar views showing a modified system according to the invention; and

FIG. 8 is a detail view of part of the system of FIGS. 5-7.

The apparatus shown in FIGS. 1-4 comprises a frame of which only one side wall and connecting bars 21, leading to the other side wall (not shown), have been illustrated. Journaled in the side walls 20 are a fixedly positioned drive and deflecting roller 22 at the input edge of conveyor 2, a pair of similarly fixed deflecting rollers 25, 26 (the latter of them driven) at the output edge of conveyor 4, and a further deflecting roller 8 forwardly of

rollers

25, 26 underneath the horizontal stretch of conveyor 2, along with a pair of idler rollers bearing externally upon conveyor 2. A compensating roller 5, engaging the band of conveyor 2 at the lower end of a depending branch thereof between

idler rollers

23 and 24, is vertically displaceable on an arm 27 in a bracket 28 on each of the walls 20 and is urged downwardly by

springs

29, 30 to maintain the band under tension. A horizontally shiftable carriage 31, guided on rollers 32 secured to the walls 20 of the machine frame, has journaled to it a deflecting rollerv 6 defining the output edge of conveyor 2, another deflecting roller 7 defining the input edge of conveyor 4 and a compensating roller 33 for the latter conveyor positioned outside the loop thereof. A wedge-shaped bridge piece 9 is pivoted at 34 to the walls of carriage 31.

Conveyor 2 is driven at constant speed from a motor 35 which is coupled, via a transmission schematically indicated at 36, with the feed roller 22 as conveyor 4 is driven from a motor 37 via a transmission 38 which actuates the feed roller 26 and includes a speed changer 39 having two output speeds of which the lower one is so related to that of motor 35 that the rate of advance of the

conveyors

2 and 4 will be the same. Carriage 31 is tied to the piston 40 of a hydraulic cylinder 41 so as to be displaceable, under pressure of a fluid from a source 47, in one or the other direction as determined by a valvetype controller 42. Both the speed changer 39 and controller 42 are actuated, via a transmission indicated sche;

matically at 43, by a sensor 44 whose feeler 45 detects, mechanically or otherwise, the gaps 46 between successive sheets 1a, 1b, 10 carried conveyor 2.

The

elements

6, 7 and 9 supported by stitute a horizontally reciprocable junction between the

conveyors

2 and 4, the width of this junction being a on the upper surface of primary carriage 31 conwhile operating the controller 42 so as to admit fluid from pump 47 into the left-hand side of hydraulic cylinder 41. The carriage 31 now begins to move toward the right, at a rate equal to the surface speed of conveyor 2, whereby the leading-edge of sheet 1b remains aligned with the output edge of wedge 9 as illustrated in FIGS. 2 and 3 which show the forward stroke of the carriage. The length of this stroke, as will be apparent from a comparison of FIGS. 1 and 3, equals approximately half the length of. a sheet; conveyor 4 in its high-speed condition advances at more than twice that rate so that, since the carrying surface of this conveyor has a maximum length (FIG. 1) about equal to that of a sheet, the first sheet In is discharged from that conveyor by the time the position of FIG. 3 is reached. It will be noted that compensating roller 5 is progressively lifted, against the force of its

springs

29 and 30, to maintain the length of the loop of conveyor 2 substantially constant.

The return stroke of piston 40, initiated by a suitable timing mechanism in controller 42, occurs at a somewhat accelerated rate so that the system returns to the position of FIG. 1 while the sheets 1b, 1c and 1d shown in FIG 3 advance along conveyor 2, as illustrated in FIG. 4, by about one-fourth of their length. At the beginning of this return stroke, i.e., in the position of FIG. 3, the controller 42 restores the speed changer 39 to its low-speed condition so that the forward sheet 1b does not experience any lengthening upon passing from primary conveyor 2 onto transit conveyor 4. In the final stage of operation, which may account for about a quarter of the duration of a cycle, the piston 40 remains stationary while the sheet 1b passes completely onto the conveyor 4 in the manner illustrated for the sheet In in FIG, 1.

The system shown in FIGS. 5-8 is generally similar to that of FIGS. 1-4, its rimary conveyor 2 being substantially identical with conveyor 2 of the preceding embodiment while its transit conveyor 4 is slightly modified as compared with conveyor 4.'

Rollers

5', 6, 7, 8', 22, 23 and 24' correspond to rollers 58 and 2224 of the earlier figures; the feed roller 26' for conveyor 4' is shown positioned below roller 8. Motors 35' and 37', speed changer 39', controller 42' and cylinder 41' with piston 40' have essentially the same functions as the corresponding elements in FIGS. 1-4; piston 40 is connected with a carriage 31 slidable on r-olls 32 which in turn are supported on the side walls 20 of the machine frame.

The shiftable rollers 6 and 7 of conveyors 2' and 4', as well as the compensating roller 33 for the latter conveyor, are journaled on the carriage 31 to define the con carrying capacity and spanning the rollers 7', 8', 26' as well as two further rollers 13a, 13b on the extremities 14a, 14b of 'a double-armed lever 14; layer 4!) avoids the roller 13a and passes, instead, around an auxiliary roller 18 of substantially similar diameter disposed forwardly of the roller 13a and on a level therewith. A tongue 9, spanning the size of carriage 31', acts as a bridge piece between rollers 6 and 7' at the junction 3'.

A set of

hoppers

48a, 48b, 48c deposits a pile of dampened fiber or. similar sheet-forming material onto thecarrying surface of conveyor 2', the resulting layer 1 being smoothed by one or more rollers 49 and doctor blades 50 before being cut into discrete sheets 1a, 1b, etc, by a slicing mechanism here shown as a blade 51; this blade is hinged to an endless chain 52 which passes around 42 in the proper synchronism so that the forward stroke of carriage 31 is started as soon as a sheet, such as the layer section In in FIG. 5, rests in its entirety on the carrying surface of conveyor 4. The contraction of this carrying surface with concurrent acceleration of this conveyor, accompanied by a corresponding lengthening of the carrying surface of conveyor 2', and the subsequent reversal of the carriage stroke, with concurrent reduction in the speed of conveyor 4, all proceed in the manner previously described.

The output edge of conveyor 4, defined by rollers 13a and 18, is selectively alignable with either of two pick-up

conveyors

17a and 17b on respective levels 15a, 15b of a rack 15 provided with side walls 16 (only one shown). Journaled in these side walls are the deflecting rollers 54a, 55a and 54b, 55b of

conveyors

17a and 17b, either or both rollers of each pair being preferably driven to advance the conveyor bands at a rate corresponding to that of conveyor 4 in its high-speed condition; these conveyors may, however, also be of the nondriven kind. The bands of

conveyors

17a and 17b are also shown to be composed of inner and

outer webs

17a, 17a" and 17b, 17b", the

outer Webs

17a and 17b" passing around reduced auxiliary rollers 56a, 56b as well as

idler rollers

57a, 57b. All the rollers except auxiliary rollers 56a, 56b are journaled on the side Walls 16 of rack 15; the rollers 56a and 562) are supported on pairs of

brackets

58a, 58b projecting rearwardly from these walls.

The rollers 13a and 13b are urged outwardly by springs 59a, 59b in the telescoped arms 14a, 14b of lever 14 on opposite sides of its fulcrum 12. A third arm 14c is articulated to a piston 60 which is vertically displaceable in a hydraulic cylinder 61, the associated controller 62 being actuated by motor 35' via a transmission 63. The relationship between this latter transmission and the transmission 64, leading to controller 42, is such that piston 60 operates only once, either upwardly or downwardly, during each reciprocating cycle of piston 40'; this operation occurs after each forward stroke of the carriage 31, i.e., after the conveyor 4 has delivered a sheet to One or the other of the

conveyors

17a, 17b. The auxiliary roller 18 is also displaceable, urged outwardly by a spring 65, t the extent necessary to keep the web 4b under tension, on an arm 66 which is limitedly swingable relatively to lever arm 14a; the shaft 67 of roller 18 is guided in a slot 68 of each side wall 20 so that this roller will be compelled to assume the positions shown in FIGS. and 7 as the lever 14 rotates through 90 between the positions illustrated in FIGS. 5 and 6, on the one hand, and FIG. 7, on the other.

It will be understood that the lever 14 with its extension 66 will be duplicated on opposite sides of the conveyor 4 adjacent respective side walls 20'.

The tongue 9' may, if desired, be replaced by an auxiliary roller similar to those shown at 18, 57a, 57b, supported on carriage 31' and surrounded by an outer layer of the band of conveyor 2', in a manner strictly analogous to that described for the

conveyors

4, 17a and 17b.

My invention is, of course, not limited to the specific embodiments described and illustrated, but may be realized in various modifications without departing from the spirit and scope of the appended claims.

I claim:

1. An apparatus for the multiple discharge of sheet material, comprising feed-conveyor means for displacing a succession of spaced-apart sheets, receiving means for said sheets positioned beyond said feed-conveyor means, said receiving means including a plurality of superimposed further conveyors and means for driving same substantially at the speed of said conveyor means, said conveyor means including an endless band having a roller at an input side of said band of a fixed height for receiving said sheets at a fixed height and vertically adjustable guide means for said band forming an output edge selectively alignable with any of said further conveyors, said guide means comprises a swingable lever with a fixed fulcrum and two extremities on opposite sides of said fulcrum, a first roller on one of said extremities in continuous engagement with said band, and a second roller on the other of said extremities engaging said band in a first lever position only while being disengaged therefrom in another lever position, said first roller being substantially aligned with respective ones of said further conveyors in said lever positions.

2. An apparatus according to claim 1 wherein said first and second rollers are displaceable on said extremities relatively to said fulcrum, further comprising spring means urging said first and second rollers outwardly from said fulcrum.

3. An apparatus according to claim 1 wherein said guide means further comprises an auxiliary roller carried on said one of said extremities forwardly of said first roller, said band including an inner layer hugging said first and second rollers and an outer layer displaceable relatively to said inner layer, said auxiliary roller being embraced only by said outer layer.

References Cited by the Examiner UNITED STATES PATENTS Re. 24-,843 7/1860 Jeddeloh 271-64 650,410 5/1900 Morin 271-36 979,547 12/1910 Norton 156-375 2,427,223 9/1947 Moore W 271-64 X 2,478,610 8/1949 Uschmann et a1 271-64 X 2,538,972 1/ 1951 Magnani. 2,563,492 8/ 1 Turrall et a1. 271-64 2,563,498 8/1951 Skinner 271-64 2,876,009 3/1959 Jeddeloh 271-64 2,901,250 8/1959 Martin 271-68 2,979,330 4/ 1961 Weber 271-36 3,030,107 4/1962 Stidwill 271-68 M. HENSON WOOD, IR., Primary Examiner.

EUGENE R. CAPOZIO, SAMUEL F. COLEMAN,

ROBERT B. REEVES, Examiners.

Claims

1. AN APPARATUS FOR THE MULTIPLE DISCHARGE OF SHEET MATERIAL, COMPRISING FEED-CONVEYOR MEANS FOR DISPLACING A SUCCESSION OF SPACED-APART SHEETS, RECEIVING MEANS FOR SAID SHEETS POSITIONED BEYOND SAID FEED-CONVEYOR MEANS, SAID RECEIVING MEANS INCLUDING A PLURALITY OF SUPERIMPOSED FURTHER CONVEYORS AND MEANS FOR DRIVING SAME SUBSTANTIALLY AT THE SPEED OF SAID CONVEYOR MEANS, SAID CONVEYOR MEANS INCLUDING AN ENDLESS BAND HAVING A ROLLER AT AN INPUT SIDE OF SAID BAND OF A FIXED HEIGHT FOR RECEIVING SAID SHEETS AT A FIXED HEIGHT AND VERTICALLY ADJUSTABLE GUIDE MEANS FOR SAID BAND FORMING AN OUTPUT EDGE SELECTIVELY ALIGNABLE WITH ANY OF SAID FURTHER CONVEYORS, SAID GUIDE MEANS COMPRISES A SWINGABLE LEVER WITH A FIXED FULCRUM AND TWO EXTREMITIES ON OPPOSITE SIDES OF SAID FULCRUM, A FIRST ROLLER ON ONE OF SAID EXTREMITIES IN CONTINUOUS ENGAGEMENT WITH SAID BAND, AND A SECOND ROLLER ON THE OTHER OF SAID EXTERMITIES ENGAGING SAID BAND IN A FIRST LEVER POSITION ONLY WHILE BEING DISENGAGED THEREFROM IN ANOTHER LEVER POSITION, SAID FIRST ROLLER BEING SUBSTANTIALLY ALIGNED WITH RESPECTIVE ONES OF SAID FURTHER CONVEYORS IN SAID LEVER POSITIONS.