Патент USA US2118531код для вставки
‘May 24, 1938.‘ 2,118,531 A. VAN VEEN END SLICE MECHANISM Filed July 26, 1955 I 2 Sheets-Sheet l l INVENTOR 9 My” TTORNEY I 2,118,531 Patented May 24, 1938 UNITED STATES vrnrlaztrr OFFICE * " 2,118,531 END SLICE MECHANISM Anton Van Veen, West Hartford, C'onn‘., assignor to American Machine & Foundry Company, a corporation of New Jersey Application July 26, 1935, Serial No. 33,291 10 Claims. This invention relates to improvements in slic lng machines of the single knife type, more par ticularly to bread-slicing machines, its main ob ject being to eliminate the extremely thin end slices obtained with loaves which are shorter than the loaf-length for which the machine has been set. Heretofore in the operation of machines of this type, when the loaves were inserted between the 10 pusher plate and the forward end plate on the slicer conveyor, if the length of the loaf were less than the distance therebetween', there would be a gap between the forward end of the loaf and the end plate; and the thickness of the ?rst slice cut by the movement of the knife across the path of the loaf would be the distance of the knife from the forward end plate less the gap between the loaf and the said end plate. The extremely thin slices thus produced are apt to crumble and -* thus detract from the appearance of the sliced loaf, particularly when wrapped. To obviate this difficulty, the present inven tion provides means for tipping the pusher plate forward so as to move the loaf against the end 25 plate and thus to close the gap before the loaf crosses the path of the slicing knife, and then to gradually return the pusher plate into up right position before the loaf has passed the knife, so as to assure slices of full thickness at 30 the trailing end of the loaf. Thus, the varia tions in the length of various loaves from the pre determined length are distributed over a com paratively large number of the intermediate slices, and the difference in the thickness of the individual slices is so small as to be unnoticeable. To this end there is provided an arm extend’; ing from the pusher plate and carrying a roller engaging in a cam track made up of three por tions: a stationary horizontal portion, a ver 40 tically adjustable horizontal portion, and‘ an intermediate portion which connects the end portions. At the beginning of each run, the ad justable portion of this cam track is set for the approximate maximum difference between the 45 lengths of the loaves to be sliced, the individual variations of the loaf lengths within this max imum difference being compensated by the plas ticity of the loaves. With this and other ob jects not speci?cally mentioned in View, the in vention consists in certain constructions and combinations hereinafter fully described and then speci?cally set forth in the claims herewith appended. - In the accompanying drawings which form a part of this speci?cation and in which like char acters of reference indicate the same or like parts: . Fig. l is a side elevation of the end slice mech 60 anism; (c1. MSW-95) Fig. 2 is an end elevation of the same, on line 2-4! of Fig. 1; Fig. 3 is a diagrammatic end elevation show ing the improved end slice mechanism in rela— tion to a single-blade bread slicing knife; Fig. 1i is a diagrammatic side elevation of the parts shown in Fig. 3; and Figs. 5 to 8 are diagrammatic side elevations showing the different stages in the operation of the end slice mechanism. In carrying the invention into effect there is 1o, provided means for continuously advancing loaves endwise, a continuously rotating knife arranged to periodically cross the path of the loaves to cut them into a series of slices, this means acting to advance the loaves in such relation to the movement ofthe knife that the thickness of the forward endslice cut therefrom will be constant and the thickness of the last end slice cut therefrom will be greater than 1.51 29. that of the intermediate slices, regardless of variations in the length of the loaves. In the best constructions contemplated the knife may be of the single blade helical type and provided with a volute cutting edge, and the loaf-advanc 25 ing means may include pairs of continuously traveling members spaced to receive loaves there between and advance them endwise, and mech anism for forwardly moving the trailing mem ber of successive pairs, with respect to the lead 30 ing member thereof, to assure engagement of the forward end of the loaf with the leading mem ber of the pair, regardless of variations in the length of the loaves, this mechanism acting to thereafter retract the trailing member of each pair in order to advance the loaf in such relation to the movement of the knife that the inter mediate slices will be cut thinner than the last slice. These various means and parts may be widely varied within the scope of the claims for the particular construction selected to illus trate the invention is but one of many possible concrete embodiments of the same. The inven 40. tion, therefore, is not to be restricted to ‘the particular construction shown and described. Referring to Figs. 1 and 2, the loaf L to be sliced is delivered on a table Ill on which it is pushed in the direction of the arrow by a mem ber such as a pusher plate ll supported by one of a number of carriers I2 attached to the con necting pins of an individual link of an endless chain !3 suitably driven from a shaft of the slicing machine. A member such as a plate H4 at the forward end of the loaf is propelled by a carrier l5 similarly attached to an endless chain it which runs parallel with chain [3 and may be adjustable lengthwise relative to the latter so that the distance between the pairs of plates H and I4 mounted on the chains can be set to lit the maximum length of the loaves to be sliced. 60 2 2,118,531 The carriers |2 and I5 are equipped with rollers |‘|, l8 and I9 guided by cam rails 20 and 2|, re spectively, to support the plates H and M in proper position. To tip the pusher plates || forward, each carrier I2 is provided with a rearwardly extend ing arm 22 carrying a roller 23. This roller en gages with a cam track consisting of a stationary portion formed by two horizontal bars 24 and 10 25, of an intermediate portion formed by two bars 26 and 21 attached to bars 24 and 25 by pivot-pins 28 and 29, and of a vertically adjust able portion formed by two horizontal bars 30 and 3| attached to bars 26 and 21 by pins 32 and 15 33. The bars 30 and 3| are joined by cross pieces 34 and 35 attached to the ends of parallel levers 3B, 31, 38 and 39 on shafts 40 and 4| supported in bearings provided in the pedestal 42 of the slicing machine. The levers 31 and 39 are fast 20 on shaft 4| and the last-mentioned of these 1e vers, 39, has a handle 43 by which the bars 30 and 3| can be raised or lowered. To maintain the bars 3|] and 3| in the desired position a slot 44 is provided in handle 43 through which passes 25 a screw 45 set in the frame 42 and, when tight ened, holding the arm 43 in the adjusted posi tion. The operation of the end slice mechanism is as follows: The loaf L on the table it) between 30 a forward end plate l4 and a pusher plate H is advanced by the latter toward the knife 46, Figs. 3 and 4, which may have a helical cutting edge with a lead equal to the desired thickness of slice and be mounted on a shaft 4‘! rotating in 35 the direction of the arrow. When the loaf ap proaches the knife 46 the roller 23 on the carrier |2 of pusher plate || enters the portion of the cam track between the adjustable bars 30 and 3|. The knife 46 may be of the type shown in 40 the patent to J. J. Diamond, No. 1,973,526, granted Sept. 11, 1934, or co-pending applica tion of Jensen and Van Veen Serial No. 713,174, ?led February 27, 1934 to which reference may be had for the details of its construction and 45 the mechanism for driving the shaft 41 in timed relation to the advancing movement of the loaf; or it may be of any other suitable single blade type. If the bars 30 and 3| were set in alignment 50 with the stationary bars 24 and 25, as shown in Fig. 5, the pusher plate || would be maintained in upright position; and if the loaf L is shorter than the normal loaf length for which the plates |4 have been set, a gap G would be established between the end plate l4 and the forward end tained its original width and the rear end of the loaf bears against the now upright pusher plate N, Fig. 8, so that the remaining slices are cut to the full thickness, which is greater than that of the intermediate slices. Although the same is not shown in the draw— ings, it should be understood that the loaf is pushed between a top tension plate and side guides (not shown) while being sliced. As the details of the same are fully disclosed in the Diamond patent and the co-pending application mentioned above, they need not be further de scribed herein. What is claimed is: 1. The combination with pairs of continuously traveling leading and trailing members spaced ln predetermined relation to receive loaves there between and continuously forward them end wise, a single blade rotary knife periodically crossing the path of the loaves forwarded by said members to slice the loaves into a plurality of slices, and means for forwardly moving the trailing member of successive pairs with respect to said leading member, to assure engagement of the forward end of the loaf with the leading w member of the pair, regardless of variations in the length of the loaves, whereby the ?rst slice out from the loaf by said knife will be of con stant thickness, and mechanism acting to there after progressively retract the trailing member i of each pair with respect to the leading mem ber thereof in order to advance the loaf in such relation to the movement of the knife that the intermediate slices will be cut thinner than the last slice, whereby the last slice will be cut to a thickness greater than the intermediate slices regardless of variations in the length of the loaves. 2. Means for forwarding articles endwise, com prising an endless chain, members carried by said chain in normally upright position to ad vance articles endwise, and devices for succes sively tipping said members forward to displace the articles relatively to the chain and then gradually returning the members to upright po sition, said devices including a cam track having a stationary horizontal portion, an intermediate portion pivoted on said stationary portion, and a vertically adjustable portion connected to said intermediate portion, and said members each in 50 cluding a carrier fastened to said chain and provided with a cam roller arranged to enter said cam track and a pusher plate supported on said carrier to engage and advance an article, whereby said vertically adjustable cam track 55 of the loaf L and the ?rst slice would be cut eX tremely thin. But when the bars 30 and 3| have been adjusted to a raised position, as in Fig. 6, the roller 23 on entering this portion of the cam 60 track, the slack in the upper run of the chain portion may be raised to set said intermediate cam track portion in a downwardly inclined po sition and cause the pusher plate to tip forward and displace the article when the cam roller enters the adjustable cam track portion and I3 will permit the carrier |2 to be tipped for ward with the plate ||, thereby pushing the loaf L against the end plate I4 and ?lling the gap G and thus increasing the thickness of the ?rst sition when the cam roller enters the inclined cam track portion. 3. The combination with a continuously rotat gradually return the pusher plate to upright po 65 slice cut by the knife 46 so that it will be of constant thickness. As soon as the roller 23 ing helical knife having a volute cutting edge, of has passed the joint 32, 33 of the cam track and while guided by the bars 26 and. 21, the plate I! is gradually returned to an upright position, so 70 that a steadily increasing gap G is established between the forward end of the loaf and the plate M, as seen in Fig. 7 and slices of pro gressively increasing thickness are out. When roller 23 has reached the joint 28, 29 of the ?xed 75 portion 24, 25 of the cam track, this gap has at gaging ?ights for engaging the rear ends of loaves of bread and continuously advancing them end wise across the path of said knife, means for maintaining said flights in erect driving relation 70 ship with the rear ends of said loaves during all portions of their travel towards and past said knife, and additional means for tilting said ?ights forward in their path of travel to move said loaves on said conveyor to advance said loaves an addi 75 a conveyor provided with a plurality of loaf en 3 2,118,531 tional amount towards said knife prior to its rear end of a loaf of bread, and for feeding said slicing engagement therewith, and progressively backward during the slicing operation, substan with pairs of traveling members, each pair having loaf continuously across the path of said contin uously rotating knife; means to tilt said ?ight forward to an extent equal approximately to the predetermined thickness of a slice of said loaf, and thereby to present the leading end of said a leading and a trailing member spaced in pre loaf for severance therefrom by said knife of an determined relation to receive loaves therebe end slice conforming substantially to said slice thickness; and means to retract said ?ight pro gressively during advancement of said loaf by said conveyor during the slicing operation, to a total tially in the manner and for the purpose set forth. ii. The combination with a conveyor provided tween and forward them endwise, of a rotary knife having a helical cutting edge periodically crossing the path of the loaves forwarded by said members to slice the loaves into a plurality of slices, means for moving the trailing member of each pair forwardly with respect to the conveyor to assure the advance of each loaf into engage ment with the leading member of the pair regard , less of the variations in the lengths of the loaves, whereby the ?rst slice cut will be of constant thickness, and mechanism acting thereafter to re 20 tract the trailing member of each pair before complete slicing of said loaves in order to advance each loaf in such relation to the movement of the knife that the intermediate slices will be cut thinner than the last slice, said mechanism being 25 so constructed and arranged that the last slice will be cut to a thickness at least equal to that of the intermediate slices regardless of the length of the loaves. 5. The combination with a continuously rotat 30 ing knife, and a conveyor provided with a plu~ rality of pairs of loaf positioning members, each having a leading and a trailing member, of means for continuously moving said conveyor to advance loaves endwise across the path of said knife, 35 means for maintaining said trailing members in substantially vertical position in contact with the rear ends of said loaves during a portion of the travel towards said knife, means for moving said trailing members forward independently of the movement of said conveyor to advance the front ends of said loaves against the front members as said loaves approach said knife, and additional means for returning said trailing members to sub stantially vertical position so that said loaves may drop back during their progress across the path of said knife, whereby the last slice cut from said loaf is at least equal to the thickness of the inter— mediate slices. 6. A bread slicing machine having the elements 50 combined and cooperating as set forth in claim 4, in which said means for causing forward move ment of the trailing member with respect to the conveyor is so disposed relatively to said knife that the trailing member is moved forward at a 55 distance from said knife of at least the length of a loaf. 7. A bread slicing machine having the elements combined and cooperating as set forth in claim 5, in which provision is made of a volute knife, and 60 in which the means for effecting advancing move ment of said conveyor, and said rotating volute knife, are so coordinated and timed ‘that the con- - volutions of the knife avoid contact with said trailing members, and the rotation of the knife 65 effects a cutting action substantially equal to the thickness of a normal slice, in the rotary travel of the knife blade volute immediately before a trailing member passes the knife, and immediate ly after it passes the knife. 8. The combination with a helical knife having 70 a volute cutting edge, and means to rotate said knife continuously, of a conveyor provided with a tilting loaf-advancing ?ight for engaging the extent equal substantially to said predetermined slice thickness, thereby to present the trailingend of said loaf to said knife for severance of a heel of similar thickness. 9. ‘The combination with a single helical knife having a volute cutting edge, and means to rotate said knife continuously, of a conveyor provided with a plurality of tilting loaf-advancing ?ights each adapted to engage the rear end of a loaf in 20 a series of loaves supplied to said conveyor suc cessively, and said ?ights being adapted to feed said loaves in succession continuously across the path of said continuously rotating knife; means to tilt each ?ight forward to an extent equal approximately to the predetermined thickness of a slice of bread and thereby to present the lead ing end of each loaf for severance therefrom by said knife of a heel of approximately said slice thickness; and means to retract each tilting ?ight 30 progressively during advancement of its corre sponding loaf by said conveyor, to a total extent equal substantially to said predetermined slice thickness, thereby to present the trailing end of, said loaf to said knife for‘ severance of a heel _ ' approximating the ?rst-named heel in thickness; said tilting ?ights being each adapted, in the course of its progressive retraction, to present the portion of the loaf, intermediate its said heels, for complete severance into slices each approxi mating sensibly the average thickness of said heels, and thus to apportion said loaf into slices - of fairly exact standard individual content, said apportionment being effected automatically in conformity to the length of each loaf as it is being sliced, thus compensating for variations in loaf length. 10. The combination with a continuously rotat ing helical knife having a volute cutting edge, of a conveyor provided with a plurality of loaf en gaging ?ights for engaging the rear ends of loaves of bread and continuously advancing said loaves 50 endwise across the path of said knife, means car ried by said ?ights for maintaining said ?ights in erect driving contact with the rear ends of 55 said loaves at all times during their travel to wards and past said knife, and devices for tilting said ?ights forward and backward in said erect driving position to vary the disposition of the loaves upon the conveyor, and relatively to the 60 path of the knife, means to rotate said knife at a predetermined speed, means to- actuate said conveyor, and means for co-ordinating the move ment of said conveyor and said tilting movements of said ?ights with the rotative cutting strokes 65 of the knife, to avoid collision with said knife, and said forward and backward tilting being timed to compensate for variations in length, as between successive loaves, and thus to insure a sensible conformity , to a predetermined slice 70 thickness throughout the loaf, including both end slices. ANTON VAN VEEN.