Cutting machine for slicing circular articles into wedges

A machine for dividing articles into wedge-shaped portions which includes a conveyor for transporting the articles along a processing path and a series of cutting stations spaced along the path. Individual article carriers, each supported on the conveyor for rotation about an axis perpendicular to the processing path, carry the articles through successive cutting stations. The carriers and associated articles are rotationally indexed between cutting stations by cam surfaces disposed along the processing path to cause the articles to be cut at the cutting stations on angularly displaced lines. The cutting stations include a rotary blade that is power-driven at a speed that approximates the speed of the conveyor to eliminate article handling problems as well as fouling of the apparatus and articles.

BACKGROUND OF THE INVENTION 
The invention relates to power-operated slicing apparatus and, more 
particularly, to apparatus for slicing an article on a plurality of 
angularly related lines. 
PRIOR ART 
In the commercial preparation of food, for example, there is a need for 
slicing whole products, such as pies, cakes, pizzas, and the like, into 
individual pieces. Typically, where the whole product is circular, for 
instance a pie, it is divided into sectors or wedges. In high volume 
processing plants, the slicing of a product, if not automated, can be a 
bottleneck in a production line and can involve significant labor costs. 
It has been estimated that with available manually actuated slicing 
equipment, it would take approximately 60 people to slice 40 pies per 
minute each into eight or ten segments. 
SUMMARY OF THE INVENTION 
The invention provides automatic power slicing apparatus for dividing a 
product into a plurality of sections by repeatedly cutting the product on 
angularly related lines. In accordance with the invention, the product is 
conveyed through a path along which at successive stations it is 
alternately sliced and then turned about an axis perpendicular to the 
path. 
One application of the invention is the sectioning of round products or 
articles, such as pies, cakes, pizzas, and the like, into customary 
sections or wedges. A round product is cut diametrally so that for each 
pass through a slicing station two pieces are formed. A constant angle 
through which the product is turned between slicing stations corresponds 
to the desired number of equal-sized pieces produced when the product has 
completed its course through the slicing path. 
In the disclosed embodiment, the product is conveyed by an endless chain 
through a path of successive slicing stations. The product is initially 
received at one end of the path on a carrier basket fixed to the endless 
chain. The connection of the basket to the chain permits its rotation 
about an axis perpendicular to the path. Basket rotating means disposed 
between adjacent slicing stations is operative to rotationally index the 
basket and the product carried by it through an angle equal to the angular 
size of the pieces desired. In a preferred embodiment, the basket rotating 
means comprises a stationary cam track in spaced, parallel relationship to 
the path taken by the endless chain and basket past the slicing stations. 
Cam follower means disposed on the basket engages the cam track and 
responds to its profile to change the angular orientation of the basket.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring now to the drawings, and in particular to FIGS. 2 and 4, there is 
shown cutter apparatus 10 constructed in accordance with the invention. 
The apparatus 10 includes a conveyor 16, cutting stations 11-14 spaced 
along the conveyor path, and a cam track 17 extending along the conveyor 
path. 
The conveyor 16 includes a frame, generally designated at 18, fabricated 
preferably from square tubing, angles and like structural elements. When 
the cutter apparatus 10 is to be used for slicing food products, these 
structural elements are preferably formed of stainless steel or aluminum. 
At each end of the frame 18 there are provided pairs of chain sprockets 19 
fixed to shafts 21 journaled on suitable bearings on the frame. At each 
side of the frame 18, in parallel relation to one another, are endless 
roller chain loops 22 trained over respective sprockets 19. The shaft 21 
at the left in FIG. 4, is power-driven by a suitable electric gear motor, 
schematically illustrated at 20 through a roller chain 25 and sprocket 30 
in a customary manner, whereby the chains 22 are driven at a constant 
speed along the frame 18. The upper reach of the chains 22 between the 
sprockets 19 forms a processing path for articles 23 (FIG. 1) being sliced 
on the apparatus 10. The lower reach of the chains 22 forms a return path 
for the chain and machine elements mounted thereon. The gear motor drive 
20 for the conveyor 16, where desired, can be adjustable in speed and is 
responsive to suitable controls known in the art. 
Fixed to the chains 22 are a closely packed series of carriage blocks 24. 
With particular reference to FIG. 10, there is shown a typical carriage 
block 24. The block 24 bridges the distance between the chains 22 and is 
fixed to the chains by opposed pins 26 received in aligned holes 27 in the 
blocks. The pins 26, on specially formed links of the chains 22, extend 
toward one another on a common axis parallel to the plane of the path of 
the upper reach of the chains 22 so as to mutually form a hinge axis for 
the block 24. Adjacent its forward end, the block 24 has a pair of slots 
28 which receive opposed pins 29. The carriage block 24 is a generally 
planar body having a generally square or rectangular outer profile and a 
central, cylindrical bore 31 taking up most of the inscribed area of the 
block. A pair of aligned slots 32 are cut in the upper side of the block 
24 through the midpoint of the front and rear walls of the block for 
clearance and passage through the cutting stations 11-14. 
A generally round carrier basket insert 36 has a minor diameter at a 
circular end wall 37 sized to rotate freely within the carriage block bore 
31. The combined thickness of the end wall 37 and height of the sidewall 
38 is generally equal to the thickness of the carriage block 24 or depth 
of the bore 31. The basket insert 36 is assembled in the block 24 so that 
when upright it is suspended by a radially outwardly directed peripheral 
flange 39 on the free end of the sidewall 38, which is too large to pass 
through the carriage block bore 31 and thereby bears on the upper surface 
of the block 24. The sidewall 38 and flange 39 are machined or otherwise 
formed with a plurality of slots 41 running the full height of these 
elements above the end wall 37. The slots 41, in the illustrated case, are 
provided in diametrally opposed pairs, with each slot being angularly 
separated from an adjacent slot by 45 degrees. The slots 41 provide 
clearance for passage through the cutting stations 11-14. A pair of 
cylindrical cam follower rolls 42 are fixed for rotation about associated 
studs 43 threaded into the lower face of the basket end wall 37. The studs 
43 are diametrally opposite one another and equally spaced from the center 
or axis of the basket insert 36. As indicated in FIGS. 7 and 8, the cam 
rolls 42 depend substantially below the lower faces of the carriage block 
24 and basket insert 36. The basket end wall 37 is formed with diametrally 
opposite slots 44, which extend through the full depth of this wall. The 
basket insert 36 is retained in the carriage block bore 31 by clips 47 
screwed to the underside of the basket end wall 37. 
The conveyor 16 is adapted to receive articles 23 for slicing at a pickup 
or loading station, indicated generally at 51, at the left end of FIGS. 1 
and 2. Articles 23 are carried from this pickup station 51 in a horizontal 
plane along the upper reach of the conveyor 16 to a discharge station 
indicated generally at 52 at the right end of FIGS. 1 and 2. 
Diametral lines joining opposite pairs of notches or slots 41 in the 
sidewall 38 of the basket insert 36 have a predetermined angular relation 
to the diametral line joining the axes of the cam rolls 42 so that the 
angular orientation of the basket insert with respect to its associated 
carrier block 24 is determined by the relative attitude of the diametral 
cam roll line to the conveying or longitudinal direction of the chains 22. 
The cutting stations 11-14 are substantially identical to one another. Each 
cutting station 11-14 includes, with particular reference to FIGS. 6-8, a 
rotary blade or wheel 56 having its hub 57 fixed to a shaft 58 bridging a 
respective portion of the upper reach of the conveyor 16. Opposite ends of 
the shaft are journaled in pillow block bearings 59. The axis of the shaft 
58 is perpendicular to the longitudinal direction of the conveyor 16. The 
rotary blade 56 comprises a relatively thin disc of metal (for example, 
0.040 inch thick) having serrations or teeth 61 over its full periphery. 
Preferably, the teeth 61 have no set, so that they lie in the plane of the 
blade 56. As indicated in the drawings, the plane of the blade 56 is 
vertical and is in vertical registration with the line of movement of the 
center of the carriage blocks 24 and basket inserts 36. The blade 56 is 
suspended at a vertical height at which its lowermost periphery lies 
slightly above the upper face of a basket insert end wall 37. A sprocket 
62 is fixed to an outboard end of the shaft 58 for purposes of driving the 
blade 56 in rotation. As indicated in FIG. 4, the sprockets 62 of each 
cutting station 11-14 are coupled by roller chains 63 to right-angle drive 
gear boxes 64. In turn, the gear boxes 64 are mutually coupled by common 
shafting 66 driven by the conveyor gear motor 20. Where the product or 
article 23 to be sliced is food, the various components of the cutting 
stations 11-14 are preferably formed of stainless steel or other suitable 
material. 
The cam track 17 is made up of a series of end-abutted plates 68. Each 
plate 68 has one or more grooves 76, 76R, 76L, cut in its upper face. The 
plates 68 are generally planar and rectangular. The plates 68 are 
preferably formed of suitable material which is self-lubricating, and are 
removably fixed on the frame 18 in close proximity to the path of the 
upper reach of the conveyor 16 so that the cam follower rolls 42 are 
received in the slots 76. The width of the slots or grooves 76 is closely 
fitted to the diameter of the cam follower rolls 42 so that there is a 
minimum amount of clearance between the vertical sides of the grooves and 
rolls. In another preferred embodiment of the invention, the plates 68 may 
be spaced apart and slots 76 may be interconnected with metal channel 
adapters. This permits accommodation of plates 68 to conveyor frames 18 of 
different lengths. 
In operation, identical articles 23, such as pies ultimately for human 
consumption, are singly loaded, manually or automatically onto each basket 
insert 36 as the insert is presented to the loading station 51. The hollow 
configuration formed by the interior of the basket sidewall 38 and end 
wall 37 closely fits the exterior of an article 23. As a "reference" 
carriage block 24, loaded with an article 23, is drawn from the loading 
station 51, a leading cam roll 42 slips into a cam slot 76R. Upon further 
movement of the reference carriage block 24, a trailing cam roll 42 
encounters the opposite slot 76L. As movement of this reference carriage 
block 42 progresses towards the first cutter station 11, its cam rolls 42 
each encounter respective zones 81, 82 in the cam slots 76R, 76L that urge 
them in opposite directions lateral to the conveying direction. This 
opposed lateral movement in the horizontal plane of the cam track 17 
results in a corresponding, precise angular displacement or index of the 
basket insert 36 in its respective carriage 24 (counterclockwise in plane 
view). During subsequent movement, as the reference carriage block 24 
translates beneath the cutter station 11, the basket insert 36 and article 
23 carried by it is prevented from rotation by the close fitting relation 
between the rolls 42 and the cam track slots 76. A spring-loaded detent 
ball 72 (FIG. 5) assembled in a blind bore 73 in a carriage block 24 
coacts with an aligned detent hole 74 in the periphery of the basket end 
wall 37 to precisely angularly position the carrier basket 36 in the block 
at successive angular displacements. 
In this phase of movement along the conveyor path, the basket insert 36, 
and reference carriage block 24 and article 23 carried in it, pass beneath 
the first cutter station 11. The angular relationship between the 
diametral line joining the cam rolls 42 and the lines between opposed 
slots 41 in the basket insert 36 is that at this cutter station 11 and 
subsequent stations 12-14, there is always a pair of slots in alignment 
with the conveying direction and providing clearance for a cutter blade 
56. 
As indicated in FIGS. 6-8, the vertical spacing between the lower periphery 
of the cutter blade 56 and the basket insert end wall 37 is arranged so 
that the blade cuts through substantially the full height of the article 
or product 23, while providing slight positive clearance between the 
lowermost edge of the blade and the upper surface of the basket end wall. 
After leaving the first cutter station 11, where the article 23 is cut 
diametrally across basket insert 36 of the reference carriage block 24, 
the basket insert is again rotationally indexed when its cam rolls 42 
engage zones 83,84 on the cam slots 76L, 76R. The resulting angular 
rotation of the basket insert 36 and article 23 contained therein is 
ordinarily substantially the same as that described previously. The 
reference carriage block and associated basket insert 36 pass below the 
second cutting station 12 and the article is cut along a second diametral 
line in the same manner as that described above with reference to the 
first station. 
Zones 85, 86 in the cam slots 76L, 76R impart another angular displacement 
to the basket insert 36 and the article 23 in preparation for passage 
through the third cutting station 13. Later, zones 87, 88 in the slots 
76R, 76L cause another rotational index of the basket insert 36 and 
article 23 prior to passing through the fourth cutter station 14. 
Subsequent to passage through the fourth cutter station 14, the last 
cutting station illustrated, zones 89, 90 in the slots 76R, 76L rotate the 
basket insert 36 through an additional angle which, in the illustrated 
case, is one-half the amplitude of the typical angular rotation proceding 
entrance to the second and successive cutting stations. 
After passing the last cutting station 14 and any subsequent cam track 
area, the reference carriage block 24, and article 23 carried in its 
associated basket insert 36, have completed their course through the 
processing or cutting path. With reference to FIG. 9, the article 23 is 
automatically unloaded from the basket insert 36 as the carriage block 24 
begins to be inverted as portions of the chain 22 straddling it are 
trained over their respective sprockets 19. The article 23 is removed by 
gravitational force and an additional force imparted by a kicker bar 91. 
The kicker bar 91 is mounted on the piston rod 92 of an air cylinder 
actuator 93. The actuator 93 is energized to cause the bar 91 to contact 
and eject an article 23 when the carriage block 24 is nearly vertical. The 
kicker bar 91 operates through one of the two slots 44 in the basket 
insert end wall 37. The piston rod 92 and kicker bar 91 immediately 
retract so that continued movement of the block 24 and insert 36 is 
unimpeded. Because gravity acts on the whole of the article 23, and 
because the article is not cut completely through by the cutter blades 56, 
the kicker bar 91 is effective to knock the article completely from the 
basket insert 36. When dislodged, the article 23 falls along a chute 96 
and is picket up and carried away by a take-off conveyor 97. The geometry 
of the chute 96 is arranged so that the upper ridge 23A of the piecrust 
cannot strike the chute 96. 
It will be understood that the cutting process is continuous, and that at a 
particular moment, separate articles 23 can be sliced simultaneously at 
the several cutting stations 11-14. 
It will be understood that the general arrangement of the apparatus 10 is 
adapted to produce as many slices of a single article as desired. While 
the disclosed embodiment is arranged to produce eight slices, it will be 
apparent that with the addition of another cutter station and suitable 
changes in the profile of the grooves 76 of the cam track 17, five equally 
spaced diametral cuts can be made to produce 10 slices from a single 
article. The article 23, as it is ejected at the discharge station 52, is 
readily subsequently fractured along the lines at which it has been cut by 
the cutter stations into the desired number of pieces. 
While the invention has been shown and described with respect to a 
particular embodiments thereof, this is for the purpose of illustration 
rather than limitation, and other variations and modifications of the 
specific embodiments herein shown and described will be apparent to those 
skilled in the art all within the intended spirit and scope of the 
invention. Accordingly, the patent is not to be limited in scope and 
effect to the specific embodiments herein shown and described nor in any 
other way that is inconsistent with the extent to which the progress in 
the art has been advanced by the invention.