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Патент USA US2118531

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‘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.
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