US3661243A

US3661243A - Conveyor system

Info

Publication number: US3661243A
Application number: US877110A
Authority: US
Inventors: Robert J Piatek
Original assignee: Kraft Inc
Current assignee: Kraft Inc
Priority date: 1967-02-23
Filing date: 1969-11-17
Publication date: 1972-05-09
Anticipated expiration: 1989-05-09

Abstract

An apparatus for transferring a plurality of individual units from a conveyor having one velocity in a given direction and changing the velocity of the units to a second value in the same direction. The units are engaged individually by elements of a second conveyor having a velocity component in the given direction the same as that of the units at the time of engagement of the elements with the units.

Description

May 9,1972

United States Patent Piatek References Cited UNITED STATES PATENTS Inventor: Robert J. Piatek, Prospect. 111.

1,527,337 2/1925 Wilcox....,................................198/32 3,131,801 5/1964 198/20 Assignee: Kraftco Corporation, Chicago, 111.

Filed: Nov. 17, 1969 Marchetti Primary E.\'aminerEdward A. Sroka Attorney-Fitch, Even, Tabin & Luedeka [21] Appl. No;

Related U.S. Appllcatlon Data Division of Ser. No. 621,095, Feb. 23, 1967, Pat. No. 3,479,024.

[ ABSTRACT An apparatus for transferring a plurality of individual units from a conveyor having one velocity in a given direction and changing the velocity of the units to a second value in the ...B65g 47/26 same direction. The units are engaged individually by ele- 198/20, 32, 34, 76

L C t n I ments of a second conveyor having a velocity component in the given direction the same as that of the units at the time of engagement ofthe elements with the units.

4 Claims, 14 Drawing F figures PRODUCT F'LON Hhvllii 1+ PATENTED MY 9 I972 S'IIEEI 1 UF 8 CUTTER Ala CUTTER ilililiE 8 coNvcacea CONVEEGEE eoecerd P/ATEK PATENTEDMAY 9 I972 SHEET [1F 8 5527 .1 PIA ran AV 2 m a 51 0d 580mm PATENTEDMY 91972 3,661,243

sum 6 BF 8 I l '-1 Illlllllll IIIll llJlHlllIll LL: I

b V \l tar PATENTEDMAY 9|s12 3.661243 sum 7 OF 8 .Zazazz tar 205527" a. PIA TEK 2y MM E1 CONVEYOR SYSTEM This application is a division of application Ser. No. 621,095, filed Feb. 23, 1967, for Method and Apparatus for Arranging Articles in a Row, now US Letters Pat. No. 3,479,024,issued Nov. 18, 1969.

This invention relates generally to a conveyor system for handling a plurality of individual units such as cheese slices and, more particularly, to a system for changing the velocity of such units, for example, accelerating the units as may be desired when converging a plurality of adjacent moving lines of individual cheese slices into a single output line of individual cheese slices.

Presliced cheese is a readily saleable item due to the ease with which it may be used in the preparation of food, both at home and on a commercial basis in restaurants, etc. In one type of automated system for making presliced cheese, a continuous sheet of warm cheese is cooled by passing it over a large chilled cylindrical roll. As the sheet of cheese leaves the chilled roll, it is slit to form continuous ribbons, each of which is then guided over suitable means and through a cutting station. As the ribbons move through the cutting station, they are cut transversely of their length to form individual cheese slices which move in lines from the cutting station. The slices are then stacked and wrapped in moisture proof airtight packages, preferably by automated means.

Naturally, it is costly to provide a separate automated wrapping operation for each ribbon of cheese moving from the chill roll. Furthermore, it is possible to build automatic wrapping machines having a capacity considerably greater than that which a single ribbon of cheese moving from the cheese roll could provide. It is therefore desirable that the individual cheese slices in a plurality of rows formed by cutting a plurality of ribbons at a cutting station be converged into a single moving composite line of individual cheese slices. Such converging may be effected by accelerating the slices to a velocity greater than their velocity as they leave the cutting station, thereby spacing the slices so that they may be shifted transversely into alignment in a single row.

Accordingly, it is an object of the invention to provide an improved apparatus for changing the velocity of a plurality of individual units such as cheese slices advancing in a row.

Another object of the invention is to provide a novel conveyor system for accelerating a plurality of individual cheese slices while maintaining close control over the position of the slices so as to avoid slippage and misalignment of the slices.

A more detailed object is to provide a novel conveyor system in which a plurality of cheese slices advancing horizontally at one velocity are picked up individually and accelerated to a higher horizontal velocity.

Various other objects of the invention, and the various advantages of the invention, will become apparent to those skilled in the art from the following description taken in connection with the accompanying drawings wherein:

FIG. 1 is a schematic diagram of a cheese packaging system incorporating the invention;

FIG. 2 is a perspective view of a portion of a chill roll and various elements associated therewith used in the cheese packaging system of FIG. 1;

FIG. 3 is a perspective view of an apparatus for cutting cheese ribbons used in the system of FIG. 1;

FIG. 4 is an enlarged sectional elevational view taken along the line 44 ofFIG. 3;

FIG. 5. is a top plan view showing a preferred pattern in which the cheese ribbons are cut by the apparatus of FIGS. 3 and 4;

FIG. 6 is a top plan view of an apparatus forming a portion of the system of FIG. 1;

FIG. 7 is a fragmentary elevational view of the apparatus of FIG. 6;

FIG. 8 is an enlarged sectional end view taken along the line 88 of F lG. 7;

FIG. 9 is an enlarged sectional end view taken along the line 99 of FIG. 7;

FIG. 10 is a sectional plan view taken along the line 10- 10 of FIG. 7; and

FIGS. 11 through 14 are fragmentary elevational views, partially in section, illustrating successive steps in the operation of a portion of the apparatus of FIG. 7, as viewed in the direction of the arrows 14-14 of FIG. 10.

The invention is shown in the drawings for purposes of illustration embodied in apparatus for handling individual slices 22 of cheese in each of a plurality of single file rows 21 which have been transformed from a plurality of ribbons 20. In the illustrated embodiment, a continuous sheet of cheese 24 is slit to provide the ribbons 20 which are advanced in side-by-side relation to a cutter 26. The cutter transforms each of the ribbons into a row of slices 22, thereby creating advancing sideby-side rows 28 of slices equal in number to the original number of ribbons 20.

Individual slices are then selected from the multiple rows 28 in a predetermined order by a converger 29 and shifted into successive alignment with one another to fonn the desired lesser number of single file rows 21, these rows representing a combination of several of the ribbons 20. The single file rows 21 are then delivered to a wrapping and packaging apparatus 30. After being formed from the ribbons 20 and prior to achieving single file orientation in a composite row 21, the individual slices 22 are accelerated to a given output velocity which closely approximates the product of the number of ribbons combined into one row and the velocity of the ribbons.

In the illustrated embodiment, l6 ribbons are combined or converged to provide four single file rows of slices. The invention is not limited, of course, to the transformation of any specific number of ribbons into a specific number of rows of slices and the particular arrangement selected is intended by way of illustration and not limitation. The following discussion will be directed principally to the convergence of eight ribbons into two single file rows, it being understood that convergence of the remaining eight ribbons is accomplished in an identical manner.

More specifically, and with reference to FIG. 2, the sheet 24 of cheese is produced through the use of a chill roll 36 onto which molten cheese is allowed to flow and cool. The sheet is removed from the chill roll by means of a scraper 37 and passed over a takeofi roll 38 where it is slit into a plurality of ribbons by a plurality of disc blades 41 mounted on a suitable axle 39. After being cut, the individual ribbons are passed over a guide roll 42 supported by a pair of arms 43, only one of which is shown in FIG. 2.

When a long chill roll is utilized and, thus, a large number of cheese ribbons are produced, it has been found convenient to employ at least two automatic wrapping and packaging machines 30 and to divide the plurality of cheese ribbons into several groups, each group serving a corresponding one of the wrapping machines. Space considerations are often such that the wrapping machines must be spaced laterally from each other or from a position in direct alignment with the ribbons as they leave the takeoff roll 38. In order to effect a spacial separation of the plurality of adjacent ribbons into a number of groups, the ribbons are first collated to move them in a stack parallel with the axis of the chill roll, and then are decollated in separate groups having the desired spacing.

The collating operation is performed by a plurality of flanged collator rollers 44 which are mounted for rotation about axes which are disposed to effect a twist in each of the cheese ribbons. A decollator conveyor 45 is disposed beneath the collator rollers 44 and the ribbons are stacked one upon the other on this conveyor as they leave the rollers and are moved in a direction parallel to the axes of the chill roll 36 and the takeoff roll 38.

Decollating of the stacked ribbons carried on the decollator conveyor 45 may be accomplished in groups at desired positions along the path of the decollator conveyor. In FIG. 1, the 16 ribbons formed are decollated in groups of eight in order to feed two wrapping machines 30. FIG. 2 is an enlarged view in perspective of the decollating of eight of the cheese ribbons.

Decollating is accomplished by means of a plurality of flanged decollator rollers 46 which have axes parallel to the axes of the collator rollers 44. The decollator rollers are disposed beneath the moving stack of cheese ribbons just past the end of the decollator conveyor 45. The ribbons are collated or stacked with each successive ribbon from right to left being supported on top of the next preceding ribbon; the stack of ribbons is decollated by diverting the ribbons one at a time from the bottom of the stack. Thus, the first ribbon into the stack is the first out of the stack.

After passing over and around a given one of the decollator rolls 46, the lowermost cheese ribbon of the stack is directed downwardly, twisted approximately 90, and guided around one of a plurality of horizontal flanged rollers 47 disposed in axial alignment with each other and supported on a common shaft. After passing around a horizontal roller 47, each of the cheese ribbons engages and is supported on a horizontal moving decollator discharge conveyor 47a, only a portion of which is shown in the drawings (FIG. 2). Thus, the cheese ribbons, as they move on the discharge conveyor 47a, are disposed ad jacent each other, are coplanar, and are moving at the same generally constant speed. The discharge conveyor 47a delivers the ribbons to a cutter conveyor 48 which in turn delivers cut slices 22 to the converger 29.

The cutter conveyor 48 (FIG. 3) operates in a timed relationship with the decollator discharge conveyor 47a, with the cutter 26, and with the converger 29 so that the size of the slices and their removal from the conveyor may be accurately controlled. The conveyor 48 comprises a plurality of continuous timing belts 49 provided with transversely extending ribs 50 and grooves 51 on their under surface. Alternate belts 490 are supported at their forward ends by splined pulleys 65 rotatably carried individually on the forward ends of brackets 67. The remaining belts 49b are supported at their forward ends by splined pulleys (not shown) carried on a shaft 69. The shaft 69 is rotatably mounted somewhat rearwardly of the rollers 65 so that the belts 49b terminate rearwardly of the termination of the belts 49a. The earlier termination of the belts 49b provides gaps 71 intermediate the forward ends of the belts 49a to facilitate the removal of the cheese slices from the belts, as will become apparent shortly.

As will be noted from FIG. 3, the ribbons 20, prior to being cut, are supported so as to span the belts 49b, with an edge portion of each ribbon resting upon the edge portion of each of two belts 49a. This relationship between the cheese and the belts is preserved after the ribbons are cut. Thus, each of the slices 22 of the rows 28 also spans a belt 49b and is supported at its side edges by each of a pair of the belts 490. When the cheese slices reach the area where the belts 49b have terminated, therefore, they span the gaps 71 for a brief duration, enabling them to be engaged from beneath by a portion of the converger 29, as hereinafter described.

The ribbons 20 are moved by the cutter conveyor 48 to and past the cutter 26. The cutter 26 comprises (FIG. 3) a plurality of cylindrical sections 73 of substantially the same diameter keyed to a common drive shaft 75 journaled between two upright plates 77 attached to opposite walls of a frame 79 of the machine. A gear 81 is drivingly secured on the drive shaft 75 and is maintained in engagement with an idler gear 83 mounted on an idler shaft 85. The idler shaft 85 is journaled in one of the plates 77 and carries a sprocket 87 connected by means of a chain 89 to a sprocket 91 keyed to the spindle 93 of a gear box 94 suitably mounted, by means not illustrated, on the frame 79 of the machine. A motor (not shown) is drivingly connected to the gear box 94. Preferably, the motor which drives the gear box 94 is also drivingly connected to the conveyor 48, either through the gear box 94 or otherwise so that the same motor drives both the conveyor 48 and the cutter 26, thereby insuring synchronization between the two.

Each of the cylindrical sections 73 of the cutter 26 carries a plurality of radially directed blades 95 spaced circumferentially about the periphery thereof. As may be seen in FIG. 4, the blades 95 are secured in their respective cylindrical sections 73 by means of mounting blocks 97 which fit in suitable recesses 99 formed in the surfaces of the sections. The blocks 97 are secured to the section by means of bolts 101. Each of the recesses 99 has an inclined wall therein and, upon tightening of each of the bolts the block 97 associated therewith is forced against the blade. This wedges the blade against the wall of the recess opposite the inclined wall and holds the blade securely in place within the recess.

The circumferential spacing of the outer ends of the blades about their respective cylindrical sections 73 corresponds to the desired length of the individual cheese slices. In the drawings, four blades are shown about the circumference of each section, but it is to be understood that variations are possible within the scope of the invention. The tips of each of the blades 95 are sharpened and the motor (not shown) drives the shaft 75 such that the tangential velocity of the tips equals the linear velocity of the cheese ribbons 20 moving beneath. At the lower extent of their arcuate travel, the blades cooperate with the belts 49 of the cutter conveyor 48 to cut the ribbons transversely to form the individual cheese slices. Because the blades are moving in the same direction and at the same speed as the ribbons, there is no bunching or tearing of the cheese during the cutting process. In fact, the cheese ribbons are under a slight tension prior to being cut. This tension is relaxed as the ribbons are cut, permitting a slight shrinkage of each individual slice and creating a slight gap 103 between each slice and the immediately preceding and succeeding slices (FIG. 3).

Referring to FIG. 5, it will be observed that the individual slices of cheese leaving the cutter 26 are in staggered positions, that is, not directly abreast of each other, for reasons subsequently explained in connection with the operation of the converger 29. More specifically, the ribbons are cut so that each transverse cut of any one ribbon is spaced longitudinally from rather than aligned with the transverse cuts of an adjacent ribbon. This longitudinal spacing is approximately equal to the quotient of the distance between cuts in any one strip divided by the given number of strips. The slices are aligned in pairs spaced transversely of the direction of movement, each pair being comprised of one slice from one of the four lines toward the left, and of one slice from one of the four lines to the right when considering the slices produced from eight ribbons. In this manner, two slices are presented for pickup by the converger at the same time. Thus, the slices shown in FIG. 5 and designated 22a through 22h are typical of those formed by a fraction of a revolution of the cutter shaft 75. It will be seen that slices 22a and 22g are in transverse alignment, as are slices 22b and 22f, 22c and 22e, and slice 22d and a slice 22h of a succeeding set. This specific arrangement has been found to be preferable in that it avoids interference between the slices as they are picked up by the converger.

The slices 22 are delivered by the cutter conveyor 48 to the converger 29, the basic function of which is to converge or combine each set of four adjacent horizontal input lines of cheese slices 28 into a single output line 21 of individual cheese slices. In the illustrated apparatus, the converger combines two groups of four input lines into two single output lines, one for each group.

The particular structure of the converger is illustrated in FIGS. 6 through 10. Some elements in these figures are broken away or left out for clarity.

The converger includes a plurality of cheese-carrying elements or pickers 105, each of which is adapted to carry an individual cheese slice 22. In FIGS. 7 and 8, the details of the pickers includes a pair of projecting prongs 107 having flattened tips or shelves 109 for contacting the underside of the cheese slice which it supports. The width of the pickers at the prongs is such as will enable the prongs to fit into the gaps 71 intermediate the belts 49a and engage the cheese slices from beneath. The prongs extend from a tubular body 111 of rectangular external and internal cross section, and may be welded to the body 111 or may be formed integral therewith in a casting. Plastic has been found to be a suitable material from which the pickers can be fabricated.

The pickers 105 are supported on a plurality of cross bars 113, each of which carries two pickers. The cross bars 113 are of rectangular cross section and extend through the tubular bodies 111 of the pickers. The tubular bodies are free to slide longitudinally along the cross bars 113 but, because of the rectangular mating cross sections of the pickers and cross bars, the pickers will turn when the cross bars are rotated.

Each of the cross bars carries a

pivot element

115 and 117, respectively, at its opposite ends. Basically, the pivot elements comprise a cylindrical body with a pair of spaced flanges on each end thereof. The pivot elements 115 are all rotatably mounted intermediate the links of a traveling conveyor chain 119. Similarly, the pivot elements 117 are all rotatably mounted intermediate the links of a traveling conveyor chain 121. (In FIGS. 6-10, parts of the

chains

119 and 121 are broken away to show

sprockets

123 and 125, discussed below, by which they are supported.) The chains are of identical size and the spacing of the

pivot elements

115 and 117 therealong is such that the cross bars extend between the chains perpendicularly thereof and are evenly spaced from each other. The cross bars move with the chains and, because of the

pivot elements

115 and 117, are free to rotate with respect thereto.

in order to guide and drive the two

chains

119 and 121 simultaneously, four

sprockets

123, 125, 127 and 129 are provided. each of which have teeth which drivingly engage one of the chains. Thus, the two

sprockets

123 and 127 engage the chain 1 19, whereas the two sprockets 125 and 129 engage the chain 117. The

sprockets

123 and 125 are mounted on a drive shaft 131 near the opposite ends thereof, and the sprockets 127 and 129 are mounted on an idler shaft 133 near its opposite ends. The

shafts

131 and 133 are suitably journalled at their ends in the frame 79. Driving torque is transmitted to the drive shaft 131 through a drive sprocket or gear 135 keyed to the shaft near the sprocket 123. The drive sprocket or gear 135 is drivingly connected to an output shaft of a gear box (not shown) driven by the motor which also powers the cutter 26 and cutter conveyor 48. Upon rotation of the drive shaft 131, the sprockets 123 through 129 and the

conveyor chains

119 and 121 are simultaneously driven so that the cross bars 113 move parallel with each other and with the chains, forming a continuous conveyor for carrying the pickers 105. Two chain tracks 137 (FIGS. 8 and 9) are supported, by means subsequently explained, between the sprockets 123-129 and serve to support and guide the upper runs of the chains, as they pass between the sprockets, by engaging the undersides of the chains.

The position of the pickers 105 is regulated both as to the orientation of the shelves 109 of the prongs 107 with respect to the horizontal and as to the position of the pickers on the cross bars 113 upon which they are slidably mounted. Movement of the pickers along the cross bars 113 initially places them in position to engage from beneath the individual slices of cheese delivered by the cutter conveyor 48 and subsequently causes them to converge the several input lines 28 of cheese slices into a pair of output lines 21. Control over the orientation of the pickers causes the shelves 109 to lie in a horizontal plane from immediately prior to the pickup of the cheese slice until after the slice has been removed from the picker, thereby minimizing shifting movement of the slice on the shelf.

Referring first to the orientation of the pickers, the pickup of the cheese slices by the pickers occurs while the pickers are moving in an arcuate ascending path, i.e., at the point of travel of the pickers at which the cross bars carrying them are passing around the sprockets 127 and 129. Normally during such movement, the flat slice-engaging surface 109 of the prongs 107 would be inclined relative to the horizontal. However, such a disposition of the surface would not be conducive to an orderly pickup of the slices. Accordingly, the pickers are guided in their movement so that the flat upper surface of the prongs remains generally horizontal as the picker moves upwardly from beneath the slice and engages the slice, and until the slice is removed from the surface 109.

in this regard, a cam track or groove 139 in the shape of a closed loop (FIG. 7) is provided in a vertical plate 141 which is secured to one wall of the frame 79 of the machine. Each of the pivot elements 117 of the cross arms 113 has an arm 143 keyed thereto on the opposite side of the chain 119 from the pickers. The arms extend inwardly toward the camming groove 139 and terminate adjacent thereto. Each of the arms carries a cam follower roller 145 which is received in the groove and moves therein as the chain 117 moves about the sprockets 125 and 129. The arms 143, being keyed to their respective pivot elements 117, control the rotative orientation of the cross bars 113 according to the contour or configuration of the groove 139. Due to the mutual rectangular cross sections of the pickers and the cross bars 113, the position of the arms 143 will also regulate the rotative orientation of the prongs 107 and shelves 109 on the pickers with respect to the horizontal.

The effect of the camming groove 139 on the position of the pickers 105 and, more, particularly, on the shelves 109 thereon may be seen best in FIG. 7. As viewed in that figure, the movement of the pickers 105 is clockwise, approaching the slices 22 in an arcuate path from underneath. The camming groove 139 is shaped such that the position of the shelves 109 on the pickers will be as shown in phantom at the left-hand edge of the figure. Just prior to and following passage of the pickers 105 between the belts 49a of the cutter conveyor 48, the shelves 109 are maintained in a horizontal position. Thus, they evenly engage the underside of the cheese slices and lift them from the conveyor. The shelves are maintained in a horizontal disposition until they have deposited the cheese slices on an output conveyor 147 as will be subsequently described.

In order for the converger to carry away all of the cheese slices delivered to it from the plurality of input lines which it services, the pickers are moved at a velocity which is several times greater than the input velocity of the ribbons 20. The order of magnitude by which the output velocity is greater than this input velocity preferably corresponds at least to the number of ribbons being converged into a single row. in the illustrated apparatus, four input lines are being converged into a single output line and, consequently, the pickers 105 travel at a speed which is about four times that of the ribbons 20. By making the output velocity at least this magnitude, the slices in the output line will not overlap but will be spaced to the same degree as when they are cut. They are therefore easily handled by the wrapping machine 30. This assumes, of course, that approximately the same spacing is desired between the slices in the output row as in the input rows. It may be desirable to effect a greater spacing between the slices in the output row to facilitate wrapping, in which case the output velocity would be an even greater multiple of the input velocity. It would be possible, of course, to accelerate the slices in two stages through the use of an intermediate conveyor so that the acceleration imparted by the picker would be less than the product of the number of ribbons and their input velocity, although the total acceleration would remain the same. In the illustrated embodiment, a unit is removed from each row in a predetermined sequence, such selection being made at a time interval which approximates the quotient of the time elapsing while one unit travels a distance equal to its own length divided by the number of rows of units being condensed into a single row.

Transfer of cheese slices between the cutter conveyor 48 and the converger pickers 105 could conceivably cause slippage or disorientation of the cheese slices with respect to each other and their direction of movement since the pickers are moving at a much greater speed than the conveyor, and since the change in speed of the cheese slice occurs over a relatively short interval of time, necessitating a rapid acceleration of the slice. Where the cheese slices are subsequently to pass into a wrapping machine, this misalignment could prevent proper wrapping of the cheese slices. Furthermore, such misalignment may be severe enough that the cheese slices could topple into the machinery and become destroyed.

The converger 29 of the present invention avoids this problem by effecting engagement between the cheese slice and the picker at that point in the travel of the picker in which it has a horizontal velocity component which is equal to the speed of the cutter conveyor and a resultant speed equal to the desired ultimate speed of the slice. The acceleration of the slice is therefore essentially entirely vertical, causing the slice to bear down upon the shelf 109 of the picker but creating no horizontal forces which could cause the slice to shift on the shelf.

In determining the precise location of this ideal point of transfer, it will be recalled that the ultimate velocity of the cheese slices is at least equal to the product of the velocity of the cheese ribbons and the number of ribbons. This ultimate velocity has a horizontal component equal to the velocity of the input conveyors, i.e., the velocity of the ribbons, when the direction of the ultimate or resultant velocity is at an angle to the horizontal whose cosine is equal to the ratio of the velocity of the ribbons to the desired ultimate velocity. Since the resultant velocity is a tangential velocity as the pickers move in a curved path at the entry end of the converger, the desired point is that point at which a tangent to this path is at the above-mentioned angle to the horizontal. The path, of course, is the path of the cross bars 113 on which the pickers are supported. If a slightly greater ultimate velocity is desired, a slightly greater angle will be used.

EXAMPLE Four ribbons are delivered to an input conveyor which is moving at a velocity of 500 in/min. The ribbons are cut into slices which move at the same velocity. The slices are converged into a single row of slices moving at a velocity of 2,000 in/min. The ratio of the initial velocity of the ribbons (500 in/min) to the ultimate velocity of the slices (2,000 in/min) is 0.250, which is the cosine of 75.5". The pickup point, therefore, lies approximately on a line drawn through the point where a tangent to the arcuate path of the cross bars is at an angle of 75.5 to the horizontal. The line drawn through this point is at the complementary angle of l4.5 to the horizontal.

Thus, at the instant each cheese slice is picked off the cutter conveyor 48 by the pickers 105, the horizontal velocity of the conveyor and the horizontal velocity of the shelves 109 of the pickers will be the same. As the pickers complete their arcuate path and begin moving only horizontally, the horizontal velocity of the pickers and, hence, the cheese slices carried thereby will have accelerated from the velocity of the cutter conveyor to the velocity ofthe output conveyor 147.

As the pickers 105 move through their arcuate paths to engage and lift the cheese slices from the input conveyors, they are maintained in alignment with the gaps 71 between the conveyor belts 49a such that the prongs 107 on the pickers will pass into the gaps. This alignment is accomplished by a plurality of guides 149 (see FIG. 8) which are mounted on a cylindrical drum 151 coaxial with the sprockets 127 and 129. The drum 151 is mounted on the shaft 133 and is spaced from the sprockets 127 and 129 by spacer bushings 153. Each of the guides 149 includes a pair of spaced apart rectangular sides 155 which extend radially outwardly from a web 156 secured to the drum 151. The guides are positioned in a predetermined pattern about the periphery of the drum in accordance with the order and position of the respective pickers 105 as they are returned to the input conveyor end of the converger, as will be explained subsequently.

In order to effect engagement between the pickers 105 and the guides 149, each picker is provided with a forwardly extending appendage 158 (FIGS. 11-14) on which is mounted a cam follower wheel 157. The spacing of the rectangular sides 155 on the guides 149 is such as to accommodate the cam follower wheel 157 of the pickers. The underside of each picker is provided in addition with a downwardly extending appendage 158 which carries a pair of spaced cam follower wheels I59 mounted for rotation about axes normal to the axis of the cross hnr 113 on which the picker is carried. A the drum 151 rotates, at the same angular velocity as the sprockets 127 and 129. the guides 149 move with the pickers as the links of the

chains

119 and 121 to which they are coupled are passed around the sprockets. The walls or sides prevent movement of the pickers 105 along the cross bars 113 upon which they are slidably mounted, and thereby proper alignment of the pickers with respect to the gaps 71 between the conveyor belts 49a is maintained. The precise manner in which each of the pickers is aligned with the proper one of the guides 149 on drum 151 as the pickers return from the output conveyor end of the converger will be explained in detail subsequently.

The converger includes a system of cams for guiding the pickers 105 from their diverged positions at the cutter conveyor 48 into single file alignment in the direction of movement. This enables the pickers to deposit the cheese slices on the output conveyor 147 in a single line. The convergence cam system includes a pair of cross bars 161 (FIGS. 7 and 8) which are mounted to extend between opposite walls of the machine frame 79 by flanges 163. A pair of mounting brackets 165 are attached to each of the two bars 161 toward the ends thereof and support eight convergence cam tracks 169, each of which consists of a wide metal strip fastened on its edge to the top surface of the brackets 165. The cam tracks 169 are received intermediate the cam wheels 159 of the pickers and are shaped to displace the pickers 105 along the cross bars 1 13 to which they are slidably fastened, and to thereby cause the pickers to converge into a single line moving toward the output conveyor. As may be seen in both FIGS. 6 and 7, the cam tracks overhang the brackets 165 toward the drum 151 and approach the periphery of the drum closely.

As the guides 149 on the drum 151 drop away from the pickers 105 at the beginning of the horizontal movement of the pickers between the two ends of the converger, one of the cam wheels 159 on each of the pickers engages the side of one of the cam tracks 169. The cam tracks at this end are spread out across the width of the converger in order to receive pickers from each of the guides 149 on the drum. As the

chains

119 and 121 continue to move the pickers toward the output conveyor, the convergence cam tracks guide each of the pickers into alignment with one of two output lines. The heights of the cam tracks varies, the two middle tracks in each group of four being higher than the outer two. This is to allow for clearance of the other of the cam wheels 159, the latter being mounted at varying levels for selection of the pickers as they are diverged in their return path, as explained below.

Because of the staggered cut of the cheese slices, as explained previously in connection with the cutter 26, and because of the positioning of the pickers and the horizontal acceleration thereof, the apparatus illustrated converges two groups of four input Iineseach of individual cheese slices into two output lines, with each of the two pickers on one of the cross bars 113 serving a different output line. The cam wheels 159 on the pickers 105 are spaced from each other such that, at the sharpest angle of the convergence cam track, both rollers will contact the cam track and roll against the surface thereof to prevent binding.

After moving from the input end of the converger 29 at which the cheese slices are picked up by the pickers 105, the pickers move toward the output end of the converger where the individual slices 22, which are now moving in two output lines 21, each of which represents the total slices in four input lines 28, are deposited upon the output conveyor 147. The output conveyor (FIGS. 6 and 7), like the cutter conveyor 48, is constructed so as to provide spaced conveyor sections so as to define gaps 148 which permit the pickers to pass through the gaps while depositing the slices on the conveyor, as hereinafter described. The upper level of the output conveyors is very slightly below that of the highest level of the shelves 109 of the pickers 105. Thus, as the pickers pass through the gaps 148 of the output conveyors 147, thecheese slice carried on each picker moves over the output conveyor, straddling the gap. As the

chains

119 and 121 pass around the

sprockets

123 and 125, the pickers drop through the gap so that each cheese slice becomes deposited on and entirely supported by the conveyor. The output conveyor is caused to travel at the speed of the pickers and there is no change in the velocity of the slices.

In order to maintain the position of the pickers 105 so that they remain within the gaps of the output conveyors 147 after the convergence cam tracks 169 terminate, and so that they arrive at a diverging station in a predetermined position, a pair of

flanged wheels

173 and 175 are provided and are mounted on the drive shaft 131 (FIGS. 6, 7 and 9). The flanged wheels rotate with the shaft 131 and, hence, with the

sprockets

123 and 125. Each of the wheels is in alignment with one of the output lines 21, each wheel servicing a converged group of four input lines 28. As the pickers 105 approach the periphery of the

wheels

173 and 175, the wheel flanges pass on either side of one of the rollers 159 on the undersides of the picker. The particular roller which is guided varies in succeeding pairs of pickers, as explained below, and by guiding the roller therein between the flanges of the wheel, the picker 105 is precisely positioned on the cross bar 113 upon which it is mounted.

Provision is made for maintaining alignment of the pickers with the flanged wheels after the cam tracks terminate. This is accomplished by guide rails 177 supported on brackets 179 which, in turn, are bolted to further brackets 181. The brackets 181 extend from the previously referred to brackets 165 which support the cam tracks 169, and may be welded to such brackets. As may be seen in FIG. 9, the rails are positioned to contact opposite ends of the body 11 1 of each picker 105 to prevent it from moving along the cross bar 113 on which it is secured.

After depositing the cheese slices on the output conveyors, the pickers are returned to the input conveyors and to their diverged position in order to once again pick up the incoming lines of cheese slices. The cams for accomplishing the divergence of the pickers are su ported on a cam support plate 183, which is mounted to a pair of cross bars 185 by means of four brackets 187, two on each cross bar. Each of the cross bars 185 is mounted to the frame 79 by flanges 189 and extends between the two walls of the frame at a location between the sprockets 123-129 driving the

chains

119 and 121. The lower portions of the chains between the sprockets are kept from sagging by two chain tracks 191 (FIG. 8) supported on brackets 193 attached to the frame 79.

Each successive picker, as it leaves the area of guidance by one of the

wheels

173 and 175, is diverged to a different position with respect to the input conveyers. The return cam guidance system provided is designed to select the proper picker for each of several divergence cam tracks 195. Referring particularly to FIGS. 11 through 14, it may be seen how the apparatus selects each of four immediately successive pickers to guide same along a different one of the cam tracks as the pickers leave the guide wheel 173 and begin their return movement in the direction of the cutter conveyor 48. By comparing the various figures, it will be seen that the two appendages 158 on the pickers 105 vary in their length. Thus, as the picker in FIG. 11 leaves the wheel 173, the wheel 159 furthest to the right will engage the cam track 195d and be diverted along this cam track. As will be noted in FIG. 10, the forward end of the track 195e, i.e., the end nearest the output end of the converger, is located far enough rearwardly of the forward end of the cam track 195d to avoid interference between the wheel furthest to the left (FIG. 11) and the track 195:.

The picker which is immediately behind the one illustrated in FIG. 11, shown in FIG. 12, has a sufficiently short righthand appendage 158 to permit the right-hand wheel 159 thereon to pass under the cam track 195d. Thus, divergence of the picker of FIG. 12 will not occur until the right-hand one of the wheels 159 strikes the surface of the cam track l95c. The cam track 1950 projects a sufficient distance from the support plate 183 to engage the wheel 159 furthest to the right.

In so far as the picker shown in FIG. 13 is concerned, the appendage 158 is on the left side of the body 111. Furthermore, the left-hand portion of the appendage is sufficiently short to permit the wheel 159 thereon to clear the cam track 195a. As a result, divergence of the picker of FIG. 13 will not occur until the left-hand wheel 159 strikes the cam track 195b, the latter projecting a sufficient distance from the support plate 183. Finally, in the picker shown in FIG. 14, the wheels 159 are of equal elevation and the left-hand wheel 159 is guided by the cam track 195a. As a result, when the picker of FIG. 14 leaves the guide wheel 173, the wheel 159 on the left-hand side will strike the surface of the cam track 1950 to be guided thereby. Location of the forward end of the track 195b rearwardly of the forward end of the track 195a prevents interference between the track 1195b and the right-hand roller 159.

Returning now to FIG. 10, it will be seen that the plan configuration of the cam tracks 195 is such that the pickers will be guided to four positions spaced along one-half of the axial length of the drum 151. Upon returning to the drum in these positions, the guides 149, which are suitably positioned on the drum, will guide the pickers between the appropriate belts of the cutter conveyor 48. The cam tracks 195e through 195g are of a similar configuration to thefour cam tracks just described, and the pickers being guided by the wheel 175 will be returned to these cam tracks in the same manner as just described.

Referring now more specifically to the construction of the output conveyor 147, as illustrated in FIGS. 6 and 7, it will be seen that the conveyor comprises a frame which includes two pair of horizontally spaced vertically arranged side plates 197. Each plate carries a stud shaft 199 adjacent its rearward end, with each stud shaft projecting inwardly toward the opposite plate of the pair. Each stud shaft 199 has rotatably mounted on it a sprocket 201. In addition, a shaft (not shown) extends between each pair of plates forwardly of the shafts 199 and carries a pair of sprockets (not shown), each of which is aligned with a sprocket of a stud shaft 199. The sprockets carry a chain to which are attached bars 203 which define a flat surface for receiving the cheese slices 28. The rearward shaft also carries a drive sprocket (not shown) suitably connected to a power source for driving of the shaft and associated chain.

Thus, between each pair of plates 197 two bar conveyors 205 are provided, these conveyors being horizontally spaced a sufficient distance to permit passage of the pickers therebetween. As the picker moves downwardly through the gap between the conveyors 205, the lateral edge portions of the slices which overhang the lateral edges of the pickers, engage the bar conveyor and are supported thereby.

In order that the central portion of the slice deposited by the pickers may also be supported, a plate 197 of each pair carries a bracket 207 having mounted on it a rearwardly extending arm which carries at its rearward end a rotatably mounted pulley 209. A similar pulley 211 is mounted rearwardly of the pulley 209 on a shaft 213 which carries a sprocket 215 for imparting rotation to the shaft through a suitable power source. The pulleys 209 and 211 carry an O-ring belt 217 of very narrow diameter which, together with the arm of the bracket 207, is narrow enough to pass between the prongs 107 of the pickers as the pickers in turn pass between the conveyors 205. Thus, the central portion of the slice is supported by the O- ring belt 217.

To review the operation of the apparatus from the beginning, and in connection with the formation of a single output line 21 of individual cheese slices 22, the cheese leaving the chill roll 36 is cut into ribbons by the blades 41. The ribbons of cheese 20 are collated into a stack by the collator rollers 44. Upon reaching the decollator rollers 46, the ribbons are peeled off and carried on the flat cutter conveyor 48 in adjacent horizontal relationship. The cutter 26 cuts the ribbons transversely to form a plurality of slices of cheese. These cheese slices are carried in lines, referred to herein as input lines 28, by the cutter conveyor to the converger 29.

The cheese slices of four of the input lines are picked up by the converger 29 and are converged into a single output line which is moving at a velocity which is four times that of the ribbons 20. This is accomplished by a plurality of pickers 105 which pick up cheese slices having a horizontal velocity which is the same as the velocity of the cutter conveyor 48, accelerate them to the velocity of the output conveyors M7, and move them into a single line. The converger then transfers the cheese slices to the output conveyor 147 which carries the cheese on to a wrapping and packaging machine 30. Thus, the four ribbons are formed into four input lines 28 of individual cheese slices 22, and then are converged into a single output line 21 of individual cheese slices, all automatically.

It may therefore be seen that the invention provides an improved method and apparatus for producing an output line of individual cheese slices from a plurality of adjacent cheese ribbons. The invention also provides an improved method and apparatus for converging a plurality of adjacent moving lines of individual cheese slices into a single output line of individual cheese slices. The spacing between the cheese slices in the output line is such as to prevent overlap and the quantity of cheese slices being conveyed by an output line is the same as the total quantity of the converged input lines.

Various other embodiments and modifications thereof in addition to those shown and described herein will be apparent to those skilled in the art from the foregoing description. For example, it should be clear that the invention is not limited to the handling of cheese and may be equally effective in the conversion of strips of various other materials into a single file row of units. Such other embodiments and modifications thereof are intended to fall within the scope of the appended claims.

I claim:

1. A conveyor system for changing substantially the velocity of continuously traveling units without substantial shifting of the arrangement of the units from a given disposition relative to each other, comprising, in combination, a first conveyor having a surface for supporting and continuously advancing a plurality of units along a first path at a predetermined linear velocity with the units thereon disposed in predetermined positions relative to each other, and a second conveyor for receiving said units from said first conveyor and for advancing said units upwardly along a second path at a linear velocity substantially different from the linear velocity imparted to the units by said first conveyor, said second conveyor having a plurality of upwardly moving carrier unit-supporting surfaces each adapted to receive one of said units, said first and second conveyors being disposed relative to each other with said second path intersecting said first path at an angle such that the component of the linear velocity of each of said unit-supporting surfaces of said carriers in the direction of movement of the unit-supporting surface of said first conveyor at the intersection of said paths is equal to the linear velocity of the unit-supporting surface of said first conveyor at said intersection so that the only significant additional force imparted to the unit is in the direction substantially normal to the unit receiving surface of said conveyors, and the arrangement of the units relative to one another will not be effected, said conveyors being adapted to effect a transfer of units between said first and second conveyors at said point of intersection.

2. A conveyor system comprising, in combination, a first conveyor having a surface adapted to support and continuously advance a plurality of units along a first path at a predetermined linear velocity, and a second conveyor having a plurality of carriers defining unit-supporting surfaces each adapted to advance a single one of said units along a second path at a linear velocity different from the linear velocity imparted to the units by said first conveyor, said first and second conveyors being disposed relative to each other with said second path intersecting said first path at an angle such that the component of the linear velocity of each of said unit-supporting surfaces of said conveyors in the direction of movement of the unit-supportin surface of said first conveyor at the intersection of said pat s is equal to the linear velocity of the unit-supporting surface of said first conveyor at said intersection, said conveyors being adapted to effect a transfer of units between said first and second conveyors at said point of intersection, said portion of said path of said second conveyor being arcuate and a tangent to such arcuate portion at said point of intersection forming with said given direction an angle whose cosine is equal to the ratio of said first velocity component in the given direction to the resultant of the velocities of each of said elements in the given direction and in a direction normal thereto at the intersection point.

3. A conveyor system comprising, in combination, a first conveyor having a surface adapted to support and continuously advance a plurality of units along a first path at a predetermined linear velocity, and a second conveyor having a plurality of carriers defining unit-supporting surfaces each adapted to advance a single one of said units along a second path at a linear velocity different from the linear velocity imparted to the units by said first conveyor, said first and second conveyors being disposed relative to each other with said second path intersecting said first path at an angle such that the component of the linear velocity of each of said unit-supporting surfaces of said conveyors in the direction of movement of the unit-supporting surface of said first conveyor at the intersection of said paths is equal to the linear velocity of the unit-supporting surface of said first conveyor at said intersection, said conveyors being adapted to efi'ect a transfer of units between said first and second conveyors at said point of intersection, said first conveyor path and said given direction being horizontal at said intersection point and said portion of said second conveyor path at the intersection point being a vertically ascending arcuate portion and beyond that point along the second path merging with a straight horizontal portion, the acceleration of each of said units and the element engaging the same being essentially vertical at said intersection point with velocities of the elements becoming ultimately horizontally directed as the unit and element advance into said horizontal portion of said second path.

4. A conveyor system comprising, in combination, a first conveyor having a surface adapted to support and continuously advance a plurality of units along a first path at a predetermined linear velocity, and a second conveyor having a plurality of carriers defining unit-supporting surfaces each adapted to advance a single one of said units along a second path at a linear velocity different from the linear velocity imparted to the units by said first conveyor, said first and second conveyors being disposed relative to each other with said second path intersecting said first path at an angle such that the component of the linear velocity of each of said unit-supporting surfaces of said conveyors in the direction of movement of the unit-supporting surface of said first conveyor at the intersection of said paths is equal to the linear velocity of the unit-supporting surface of said first conveyor at said intersection, said conveyors being adapted to effect a transfer of units between said first and second conveyors at said point of intersection, said first conveyor path and said given direction being horizontal at said intersection point, said portion of said second conveyor path at the intersection point being a vertically ascending arcuate portion, and a tangent to such arcuate portion forming with the horizontal an angle whose cosine is equal to the ratio of the horizontal velocity of the first con veyor at the intersection point to the resultant of the horizontal and vertical velocities of each of said elements at the intersection point.

Claims

2. A conveyor system comprising, in combination, a first conveyor having a surface adapted to support and continuously advance a plurality of units along a first path at a predetermined linear velocity, and a second conveyor having a plurality of carrIers defining unit-supporting surfaces each adapted to advance a single one of said units along a second path at a linear velocity different from the linear velocity imparted to the units by said first conveyor, said first and second conveyors being disposed relative to each other with said second path intersecting said first path at an angle such that the component of the linear velocity of each of said unit-supporting surfaces of said conveyors in the direction of movement of the unit-supporting surface of said first conveyor at the intersection of said paths is equal to the linear velocity of the unit-supporting surface of said first conveyor at said intersection, said conveyors being adapted to effect a transfer of units between said first and second conveyors at said point of intersection, said portion of said path of said second conveyor being arcuate and a tangent to such arcuate portion at said point of intersection forming with said given direction an angle whose cosine is equal to the ratio of said first velocity component in the given direction to the resultant of the velocities of each of said elements in the given direction and in a direction normal thereto at the intersection point.

3. A conveyor system comprising, in combination, a first conveyor having a surface adapted to support and continuously advance a plurality of units along a first path at a predetermined linear velocity, and a second conveyor having a plurality of carriers defining unit-supporting surfaces each adapted to advance a single one of said units along a second path at a linear velocity different from the linear velocity imparted to the units by said first conveyor, said first and second conveyors being disposed relative to each other with said second path intersecting said first path at an angle such that the component of the linear velocity of each of said unit-supporting surfaces of said conveyors in the direction of movement of the unit-supporting surface of said first conveyor at the intersection of said paths is equal to the linear velocity of the unit-supporting surface of said first conveyor at said intersection, said conveyors being adapted to effect a transfer of units between said first and second conveyors at said point of intersection, said first conveyor path and said given direction being horizontal at said intersection point and said portion of said second conveyor path at the intersection point being a vertically ascending arcuate portion and beyond that point along the second path merging with a straight horizontal portion, the acceleration of each of said units and the element engaging the same being essentially vertical at said intersection point with velocities of the elements becoming ultimately horizontally directed as the unit and element advance into said horizontal portion of said second path.

4. A conveyor system comprising, in combination, a first conveyor having a surface adapted to support and continuously advance a plurality of units along a first path at a predetermined linear velocity, and a second conveyor having a plurality of carriers defining unit-supporting surfaces each adapted to advance a single one of said units along a second path at a linear velocity different from the linear velocity imparted to the units by said first conveyor, said first and second conveyors being disposed relative to each other with said second path intersecting said first path at an angle such that the component of the linear velocity of each of said unit-supporting surfaces of said conveyors in the direction of movement of the unit-supporting surface of said first conveyor at the intersection of said paths is equal to the linear velocity of the unit-supporting surface of said first conveyor at said intersection, said conveyors being adapted to effect a transfer of units between said first and second conveyors at said point of intersection, said first conveyor path and said given direction being horizontal at said intersection point, said portion of said second conveyor path at the intersection point being a vertically ascending arcuate portion, and a tangent to such arcuate portion forming with the horizontal an angle whose cosine is equal to the ratio of the horizontal velocity of the first conveyor at the intersection point to the resultant of the horizontal and vertical velocities of each of said elements at the intersection point.