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Патент USA US2105033

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Jan. 11,1938.’
"r. s. FlTCHETT
SLOTTER HEAD
Filed Feb. 13, 1936
2,195,033
Patented Jan. 11', 1938
lTE
2,105,313
STATES PATENT OFFICE
2,105,033
SLOTTER HEAD
Thomas S. Fitchctt, Glen Arm, Md., assignor to
F. X. Hooper Company, Inc., Glen Arm, Md.,
a corporation of Maryland
Application February 13, 1936, Serial No. 63,694
7 Claims.
I)
cutters are removed and replaced by the thicker‘
male cutters and. the female cutters or double
groove slotter heads are readjusted along their
shaft to receive these cutters in the correspond
which in the development of the present inven
tion have been applied to the slotting of box par
titions of which the cellular or crate partition is
ing slots, the spacing being chosen to suit the 5
Work,
an example.
slotter of this general type, it is necessary to place
'
The invention to be described is, however, in
10 its broader conception capable of application to
the slitting of box blanks and the like and ‘even
to scoring.
In the cutting of paper box partitions or crates
and the like the variation in the thickness of
' the paper, and the consequent necessity for a va
riation in width of the slots cut in the partition
members to provide for the well known inter
locking feature has led to the development of
the multiple groove female cutterv or slotter head.
As a large proportion of these partitions are‘ of
corrugated board which is generally made in two
standard thicknesses, the‘ multiple groove cutters
or slotter heads are most commonly two groove
female cutters, having their grooves of widths
corresponding to these two standard thicknesses
of board and located side by side, called double
groove slotter heads, and the cooperating male
knives are of such thicknesses, respectively as
to ?t and enter these grooves so that the coop
30 erating male and female cutters are in practice
adapted to cut slots of two standard widths to
receive paper board of these respective thick
It should be understood‘ in this connection that
the male and female slotter heads of this type are
mounted on parallel shafts which are positively
geared together to run at the same speed or
speeds, the male slotter heads being on one shaft
and spaced according to the spacing of the par
40 tition and the female cutter or grooved slotter
heads on the other shaft and similarly spaced.
The'male knives ?t each in its groove in the cor
responding female or grooved slotter head with
a considerable degree of nicety giving a shearing
45 cut at each edge, i. e., on each side of the groove,
and the edges on each side of each‘ male knife
and on each side of each groove of the female or
grooved slotter head are sharpened for this pur
pose.
50
(01. 164—-28)
The invention relates to the cutting, or more
particularly ‘to the slotting of paper or similar
material and has particular reference to the ro
tary, or oscillating type of cutter or slotter heads
To cut relatively narrow slots the malecutters
of the narrow width are placed on the male heads
and the heads are adjusted on their shafts to
cooperate with the correspondingly narrow slots
of the double groove slotter head or female cut
55 ter and to cut the wider slots the narrow male
To make cellular partitions or crates on any
a number of male slotter heads and knives prop
erly spaced on one shaft and an equal number 10
of grooved or female slotter heads similarly
spaced on the other shaft. In the prior art ma
chines the dilferent Width grooves being side by
side, it is necessary in changing from one width
of slot to‘ the other, not only to change the male 15
knives, but to loosen and move along the shaft
and respace all the male cutter heads in order
that the male cutters may mesh with the grooves
in the grooved or female heads. Also, the width
of the female cutter heads or their axial length
with their two grooves side by side is such as to
prevent short, i. e. close spacing of the slots to
be cut as the corresponding grooves of the dif
ferent double grooved heads can not be placed
su?iciently close together, also each double 2
grooved slotter head or two grooved female cut
ter consists in the existing practice of three knives
having four cutting edgesto be sharpened.
The object of the invention is to improve and
simplify the present existing slotter construction
and operation and to increase its efficiency by
decreasing the time required- to adjust the ma
chine to different work and the cost of mainte
nance and to reduce the minimum spacing of the
slots to be cut.
35
In the improved construction the multiple dif
ferent width grooves of the female or double
grooved slotter head are placed end to end or in
substantial alignment circumferentially instead
of side by side.
The shafts carrying the male
and female cutter heads, respectively, being posi
tively geared together to operate together, the
male knives are so placed as to enter the corre
sponding grooves in the female or grooved slotter
head, as the shafts revolve or oscillate.
An important advantage of the invention is
45
that one side, i. e., one cutting plane of both the
corresponding male and female knives and grooves
of all widths is in accordance with the improved
construction and operation located in a common
radial plane of both shafts for any operative ad
justment of the slotter heads so that neither head
need' be adjusted along its shaft as the width
of the slot is changed providing the spacing of
the slots to be cut is not changed.
55
2
2,105,033
Another advantage is that with the improved
multiple or double groove slotter head the axial
length of the head being decreased as compared
to the old type of double groove slotting head, the
slots can be placed nearer to each other, i. e., more
closely spaced when desired.
It is also of advantage that while the old type
of double grooved slotter head consisted of three
knives and four cutting edges, the improved type
10 of the present invention has but two knives and in
As shown, the upper or male head fl is in the
form of a split collar having its endsé' and 4”
slightly spaced and connected by a screw 6 at right
angles to the radius at said ends 5', 4". By means
of this screw 6 the head it is clamped to the shaft
I at the will of the operator or released to be
moved along the shaft and reclamped in any de
sired position of adjustment. The angular rela
tion of the head If to the shaft is maintained con
stant by means of a key or feather ‘i which ex
10
the preferred form but two cutting edges and the. tends the entire length of the shaft on which the
number of different widths of groove and male
heads 4 are to be mounted and engages a groove
slotter blades is not de?nitely limited but maybe
increased Without increasing the, width or axial
15 length of the grooved slotter head.
The accompanying drawing illustrates a single
slotting or cutting unit embodying the features
of my invention in the preferred form. The man
ner of driving the slotter shafts, feeding the...
20 paper board thereto and of spacing and arrang
1’ in the inner periphery of the head 5%. The axial
end surface 8 of the head it is also rabbeted or
in the form of a circular arc concentric with the 20
axis of the shaft I and a positioning and support
ing the slotter units on the shafts being matters
well known in the art, illustration of which is re
ing surface H, in a plane at right angles to said
garded as unnecessary.
axis. For cooperation with each upper or male
head 4 a plurality of knives are provided. In the
In the drawing:
25
cut away on one axial end or side, i. e., on the
right in Figure 3 beginning at points spaced on
each side of the ends 4', 4" and extending around
the head from these points, forming a knife seat
9 having a base surface it parallel to the axis and
Figure. 1 is a bottom plan View of a double
groove slotter head made in accordance with the
invention and assembled on the lower slotter shaft
which is shown fragmentarily.
Figure 2 is a similar View of the slotter head
30 parts released from the assembled relation vand
moved slightly apart in the direction of the axis.
Figure 3 is a front elevation of a single slotter
form shown there are two of these knives indi
cated by reference characters I? and iii. These
are each respectively according to the practice,
of a thickness slightly greater than the thickness
of the material to be cut and interlocked, in the
manufacture of box partitions.
30
While the double groove slotter of the invention
is particularly adapted to use in the manufacture
unit, the upper and lower slotter shafts on which
of crates or interlocking partitions from paper
- a series or gang of these units would ordinarily be
board and/or corrugated board of two standard
35 mounted being shown fragmentarily.
Figure 4 is a side elevation of the unit looking
from the right in Figure 3, the shafts being shown
in section.
Referring to the drawing by numerals, each of
40 which is used to indicate the same or similar parts
in the different ?gures, the upper and lower slot
ter shafts l and 2 are positively geared together
as by toothed gears l‘ and 2’ secured to the
respective shafts and shown fragmentarily in
45 Figure 4, to maintain a uniform angular relation
between the shafts in accordance with the prac
tice prevailing in the art. This practice gener
50
55
60
65
ally provides intermeshing toothed gears of equal
size secured to the respective shafts. The exist
ing practice also provides for continuous rotation
of the slotter shafts and suitable feeding of the
material indicated at 3, in Figures 3 and 4. This
is the preferred construction and operation in the
present instance.
It is also feasible in place of the above described
operation to oscillate the slotter shafts and the
slotter heads thereon, changing the time of oscil
lation to bring either knife into cutting relation
with the corresponding groove, and presenting
the material by means of a reciprocating feed by
which it is withdrawn after each cut, the drive
and feed are, however, no part of the present in
vention, which relates to the slotter unit.
Referring again to the drawing, the upper slot
ter or cutter shaft !, the term slotter being gener
ally used in the art to designate machines and
cutters intended to perform the operation above
indicated, carries secured thereto a suitable num
ber of male or upper slotter heads of which a sin
70 gle one is shown at ii and the lower slotter, or cut
ter shaft 2 carries secured thereto a similar num
ber of female cutter heads or, as they are termed
in the art, lower grooved slotter heads of which
one is shown at 5, in operative relation to the
75 head 4.
thicknesses, it may be applied to other uses and
the thickness or width of the knives likewise the
width of the grooves to be further described may
be otherwise determined.
The knives l2 and M are adapted to be sup
ported and secured in the seat 9. As shown they
are of substantially arcuate form having the in
ner periphery of proper radius to ?t the base Iii
of the seat 9, the outer or cutting edges i5 pro
jecting beyond the outer surface it of the male or
upper head 4 which is preferably of short cylin
drical form. This surface may cooperate with
the corresponding surface I? of the lower head to
guide the material and hold it in cutting relation
to the knives.
‘
The knife l2 which has its cutting edges i2",
52”’ spaced by the full thickness of its blade,
knife M being similarly constructed, is held in
operative position in the seat 9 by means of cap
screws 53 which engage tapped holes l9 extend
ing into the male head 5 parallel to the shaft 55
axis from the positioning and supporting surface
ii. These screws are passed through holes 263
suitably located in the knife 42 and the knife it
is similarly secured by means of'similar bolts
not shown entering tapped holes 25 and passing
through holes 22 in. knife it.
.
It will be noted that the knives i2 and id as
shown are symmetrically located on opposite sides
of a diameter drawn between the ends 45’, a"
of the collarlike head ii and that the position 65
of cutter if is indicated in dotted lines meaning
that in the preferred arrangement and opera
tion of the slotter but one cutter is in place at a
time. It is essential so long as the upper or
male head 1i is to cooperate with the head 5 or‘
one so related to the shaft 2 and having its
grooves identically located and of the same di—
mensions that the knife 52 or M, whichever one
isubeing used, be mounted in its proper relation
to the head 4 in order‘that it may enter the
2,105,033
corresponding slot in the head 5 or the portion
of the slot in said head which is of correspond
ing width. 'To avoid dislocation- or improper
meshing, it has been suggested that shafts! and
2 be positively geared together.
, To effect a clean severance of the material at
the bottom or end of each slot'cut in the paper,
the end of each knife is concave and pointed as
shown at 213, 213’ and the two outer peripheral
10 edges of the knives at 12" and i2’” are sharp
ened.
'
Many of the details above described are ca
pable of wide variation within the skill of the
designer.
15
The lower or grooved slotter head 5 embodies
important features of the invention. It is fre
quently necessary, as already pointed out, to
change the width of the slots cut by such a
machine to conform to paper board of different
20 thicknesses. ' For this purpose the double groove
slotters now in use have the lower or grooved
25
30
35
40
45
head provided with two grooves side by side and
of widths corresponding respectively to the thick
ness of these two standard thicknesses of board.
Some of the disadvantages of this arrangement
have been discussed.
These and other difficulties of the prior art
construction have been reduced and overcome by
the provision of multiple width grooves arranged
end to! end in substantial alignment and prefer
ably in continuity so that the multiple grooved
cutting head which in accordance with the re
quirements of the present practice is a two
grooved or double grooved head, has but two cutting edges and two cutting members or knives.
The grooved cutting head 5 is shown most
clearly in Figures 1 and 2.
The grooved slotter head v5 in the preferred
form shown, it being understood that variations
of form and detail are contemplated, consists of
two slotter members or knives 25 and 26. These
are preferably shown of ring or hollow disk shape,
the inner periphery of each at 27 being circular
and adapted to ?t the lower shaft 2, which is
grooved at 29 to receive a key 28. This key enters
a suitable key slot in each of the slotter members
or knives 25 and 26. These members 25 and 26,
Which are of equal diameter are secured together
with their outer peripheral circular surfaces I‘!
and‘ their inner peripheral surfaces 2'1‘ in align
ment in the directions of the axis, by means of
screws 39 which are spaced along the circumfer
ence between the inner and outer peripheries.
The slotter head 5 as assembled, in the form
55 shown, is therefore of short cylindrical or ?at
ring shape, and is mounted on the shaft 2 for
adjustment along the shaft, being clamped in
adjusted position by means of a clamping screw
32 which is radially placed engaging a threaded
60 hole 3i’ conveniently located as to the cutting
edges preferably as shown. The clamping screw
3i bears directly on the key 28, which serves to
maintain the angular relation between the slot
ter head and shaft in all positions of adjustment
65 of the slotter head along the shaft.
The arrangement of the slotting or cutting
edges retains the advantages of the double groove
slotter head, and avoids dif?culties of the old type
having the grooves side by side.
In the preferred form of head shown which is
70
capable of considerable variation within the scope
of the invention, the slotter member 26 is pro
vided with a spacer 32. This is shown in the
form of a boss surrounding the inner periphery
75 of shaft opening 21, though it is not essentially
3.
integral with either slotter member. The pe
ripheral surface 32’ of this boss lies below the
path of the knives i2 and i4 and the surface 33
is offset so that it lies in two parallel planes pro
viding surfaces 34 and 35 at right angles to the
axis, connected by key surface 35 parallel to or
in a plane of the axis and extending across the
boss in the direction of a diameter. The inner
face of the member 25 as to an area 31 surround
ing the inner periphery 2? is the complement of 10
the surfaces 33, 36, 3'5, 38 of the boss, said area
having flat surfaces 3t’, 35’ and key surface 36’
so that the slotter members 25, 26 ?t together
in one exact angular relation and one only. The
parts may be otherwise keyed, one relatively to
the other, in various ways. In the construction
shown they are further located by means of dowel
pins 38 which extend through slotter member 25
into slotter member 26 parallel to the axis. The
members 25 and 25 thus positioned are secured
together as described by means of screws 30.
The arrangement of a plurality of slotter head
grooves or slots, the term groove being used for
convenience to describe either a groove or slot,
the closing of the bottom of the slot not being
essential, said grooves or slots being of different
widths and arranged end to end in substantial
alignment in the direction of the circumference
of the head so that these grooves can be engaged
by male knives similarly arranged on the co- '
operating male head, the male knives with the
exception of one knife being in accordance with
the present operation removed or otherwise ren~
dered inoperative for the cutting operation in
order to cut slots of a single width, is of primary 1
importance.
In the form shown the slotter member 26 has
its peripheral edge 40 which is disposed toward
the member 25, located in a ?at plane at right
angles to the axis, and the surface of member 26
within said edge is shown as undercut at 41 to
increase the sharpness and shearing qualities of
said edge.
The peripheral cutting edge 42 of slotter mem
ber 25 which is disposed toward member 26 is 45
also undercut, as is the edge 46, this feature in
both instances being preferred but not essential.
The edge G2 in the form shown is in two radial
planes both parallel to the plane of edge 48 and
substantially at right angles to the shaft axis.
The portions of edge 42 indicated by 42’ and 42"
are both parallel or substantially parallel to the
edge 40 to the extent that the cuts at each side
of the slots produced by these edges are parallel
or sufficiently close to parallel for the purpose in
hand. The distance between the plane of edges
Q2’ and the plane of edge d2", 1. e., the offset,
represents the difference between the spacing of
edges 46 and 62’ and the spacing of edges 40 and
42", and hence the difference between the width 60
of groove 115 and groove 46 between their edges
when the parts are assembled and secured by in
serting and tightening screws 30, as seen in Fig
ure 1. The offset at 4‘! between theedges is pref
erably in line with surface 36'.
For convenience, in producing, maintaining and
sharpening, etc., the edges 42' and 42" are con
nected by an inclined edge portion 47. It is not
necessary for all purposes and in accordance with
the broader conception of the invention that
grooves 45 and 46 be continuous or in exact align—
ment, but important advantages result from have
ing one edge of the two grooves in exact align
ment in a plane at right angles to the axis of
rotation as described.
4
2,105,033
In accordance with the existing practice, the
corrugated board'most generally used for box
partitions comes in two standard thicknesses and
the slotters used for this purpose have been
adapted to the cutting of slots of two correspond
ing widths substantially equal to the thickness of
the board.
The partitions interlock with other
partitions of the same thickness hence the slots
are for this purpose made of a width equal to the
thickness of the material being cut. To meet the
old type having the grooves side by side, though
these edges need not in some forms of the in
vention be continuous as shown.
I have thus described a slotter unit embodying
the features of my invention in the preferred
form, the description being speci?c and in de
tail in order that the manner of constructing,
applying, operating and using the invention may 10
requirements of the practice, the knife !2 may
be fully understood. However, the speci?c terms
be ass of an inch in width and it ?ts rather closely
within the groove or slot 55 in which it rolls in
limiting sense, the scope of the invention being
the operation of the slotter to cut slots of this
width which corresponds to the thickness of the
standard material known as B fiute. To cut the
wider grooves for the thicker material, the knife
I 2 is according to the preferred operation removed
and a thicker knife M is secured in the position
in which it is shown in dotted lines, Figure 4.
According to present standard, the knife Hi may
be 1/4 inch thick corresponding to A ?ute board
and groove 46 is of corresponding width so that
knife l4 ?ts closely therein. In operation the
knife 64 rolls in groove lit. In slotting partition
strips the slots are cut from one edge half way
across the partition. With either knife removed
and the other secured in its proper position as
shown in each unit, and the proper number of
slotter units properly spaced being secured to the
two shafts i and 2, the male heads on one shaft
and the grooved heads on the other, and the par
tition strips being presented in proper time with
the slotter operation, feeds for this purpose being
35 Well known in the art, the slots will be out of
proper depth and width and with the desired
spacing.
The positioning of both knives I2 and M, as
indicated in Figures 3 and 4, so that the surface
610 52' of knife 52 and the edge E2” of this knife are
in the same plane as are the corresponding sur
. face and edge of knife M when it is in use, serves
in connection with the similarly aligned cutting
edge or edges Ml of both grooves or slots, 1&5 and
M5, which edge or edges 558 out in the same plane
as do the corresponding edges of knives i2 and
id to eliminate the necessity for changing the
position of either the female or grooved head 5v
or the male head :‘i when the width of the slots
50 to be cut is changed. This improved result or
operation is predicated on the fact that without
regard to the width of the grooves 45 and 46 and
knives l2 and ill, the spacing of the correspond
ing edges or sides of the slots cut in the paper
55 is determined for all practical purposes by the
spacing of the shearing edge Gil of one cutting
unit 4, 5 from the corresponding cutting edge Mi
of the next unit. This and the spacing of the
male knives is changed only when the spacing
of the slots cut is to be changed. The ability to
change the width of the slot cut in the material
in this way without change of adjustment effects
a considerable saving of time in operation and
a considerable increase in facility with which
65
the machine may be operated by the average
workman in a paper box plant.
The placing of the different width grooves of
the female head in alignment instead of side by
side is also of advantage on account of the re
u duced axial length of the grooved head 5 in that
75
two cutting edges 40 and 42, instead of three vfe
male knives and four cutting edges as in the
it provides for a considerably shorter spacing of
the slots to be cut and it further cheapens the
construction by providing for the use of two fe
male knives or cutter members 25 and 26 with
herein are used descriptively rather than in a
de?ned in the claims. .
What I claim as new and desire to secure by
Letters Patent is:
1. A female slotter head for paper board and
the like adapted to be mounted for operative
movement about an axis, the head having a plu
rality of cutting slots, the respective slots being of
different widths and each having a shearing edge
extending along each of its sides, the shearing
20
edge on one and the same side of two of said
slots being located in a single plane at right an
gles to said axis.
I
2. A female slotter head for paper board and
the like adapted to be mounted for operative
movement about an axis, the head having a plu
rality of cutting slots, the respective slots being
of diiferent widths and each having a shearing
edge extending along each of its sides, the shear
ing edges on one and the same side of two of said
slots being located in a single plane at right an
gles to said axis, and in combination therewith a
male slotter head adapted to be mounted for ‘
movement about an axis parallel to the axis of
the female slotter head and in operative relation
thereto, the male head having means for posi
tioning and holding a plurality of male slotting
knives, said positioning means being adapted to 40
locate one cutting edge of two- of said supported
knives substantially in said plane of the shear
ing edges of said slots, on said one side and two
slotting knives of respective widths to enter said
slots, having their edges spaced to cooperate with
the edges of said slots and adapted to be secured
to said male head in slotting relation to the cor
responding slots in said female head.
3. The combination with a male slotter head
adapted to be mounted for movement about an .
axis in cutting, said head having a support for
positioning a plurality of male slotter knives, and
said knives each having two parallel cutting
edges spaced apart, and means for securing said
knives on said support in different cutting posi
tions one edge of each knife on the same side of
said knives being in a single plane at right angles
to said axis, of a female slotter head adapted to
be mounted for movement about an axis parallel
to said male head axis and in operative relation
thereto, the female head having cutting slots of
different widths placed end to end and aligned
in the direction of their length, each having sub
stantially parallel cutting edges at the opposite
sides, the cutting edges on one side of a plurality
of said slots being in a single plane at right an
gles to said axes, both said single planes being
on the same side of the knives and slots, respec
tively and both heads being adjustable in the di
rection of the axes to bring these planes together.
4. A female slotter head comprising two ring
cutter members of substantially the same diame
ter, one having a peripheral shearing edge in a
plane at right angles to the ring axis and the
other having two peripheral shearing edges end 75
5
2,105,033
to end and in different planes at right angles to
the axis of the second ring member, a spacer and
means for securing said ring members together
on opposite sides of said spacer with their axes
in alignment, thus assembling the complete head
with said edges opposed and spaced apart, form
ing two slots of different widths.
5. A female slotter head comprising two ring
cutter members of substantially the same diame
10 ter, one having a peripheral shearing edge in a
plane at right angles to the ring axis and the
other having two peripheral shearing edges end
to end and in different planes at right angles to
the axis of the second ring member, a spacer and
means for securing said ring members together
on opposite sides of said spacer with their axes
in alignment, thus assembling the complete head
with said edges opposed and spaced apart, form
ing two slots of different widths, and said rings
and spacer having positioning means to give and
maintain the same angular relation of the rings
and edges whenever they are assembled or reas
sembled.
6. A female slotter head comprising two knives
adapted to be mounted for operative movement 5
about an axis, one having a peripheral cutting
edge in a single plane, at right angles to said axis
and the other having a peripheral cutting edge
o?set in two planes at right angles to the axis
and means for securing said knives together with 1O
said edges opposed and spaced apart to form two
cutting grooves in substantial alignment and of
different widths.
v
7. A grooved slotter head having cutting
grooves of different widths placed end to end and
extending in the same direction, the grooves hav
ing cutting edges at each side, the edges on one
side of two grooves being in a single cutting plane.
THOMAS S. FITCHETT.
20
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