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Патент USA US3038730

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June 12, 1962
3,038,720
W. A. SCHULZ
PRINTER-SLOTTER BLANK FEEDER
Filed Sept. 15, 1960
2 Sheets-Sheet l
INVENTOR.
6%; 1-52 H.5cwu4z
BY
June 12, 1962
'
w, A. SCHULZ
3,038,720
PRINTER-SLOTTER BLANK FEEDER
Filed Sept. 15, 1960
‘
_
2 Sheets-Sheet 2
a-i
'
IN VEN TOR.
rag/Jae 6'- QSCHUL Z
3,038,720
United States. P316111;
Patented June 12, 1962
1
2
3,038,720
Walter A. Schulz, Baltimore, Md., assignor to Koppers
Fllglq. 3 is a side view of the feed table illustrated in
PRINTER-SLOTTER BLANK FEEDER
Company, Inc., a corporation of Delaware
Filed Sept. 15, 1960, Ser. No. 56,212
FIG. 4 is a view taken substantially along the lines 4-—4
of FIG. 1 showing a detail of one of the lifting elements of
the lifting mechanism.
FIG. 5 is a schematic view of the electro-pneumatic
controls.
This invention relates to printer slotters and similar
Referring now to the drawings, there is shown a feed
machines in which box blanks or the like made from stiff
table 1 which is suitably supported on the printer slotter
and relatively thick material such as corrugated paper are 10 side frames 2 and 3 on Which there is carried the usual
‘
3 Claims.
(Cl. 271-44)
fed from the bottom of a stack of blanks resting on a table
at the front of a machine by ‘means of reciprocating feed
members which engage the front edge of each blank in turn
feed gate and pull rollers (not shown). Mounted ad
jacent the rear of the feed table 1 is a stack supporting
mechanism 4 for holding the front edge of the stack of
and advance it into the bite of the rollers. The stack of
blanks above the table surface comprising two supporting
blanks is placed in front of the pull rollers by the gates 15 blocks 5 on which there is fastened a channel 6. The
and the feed members advance each bottom blank in turn
from the gates into the bite of the rollers. As these re
quire a de?nite period to pass each blank of a given width
blocks 5 and channel 6 are fixed as by adjustable clamp 8
to guide rails 9 and mounted in slots 10 extending longi
tudinally of the bed so as to permit sliding movement rela
in the direction of feed to prevent overlapping of the
tive to the feed gate and thereby accommodate blanks of
blanks, it is necessary to coordinate the rate of feed of 20 different widths. The clamp‘ and guide means is of more
or less conventional structure.
the reciprocating member with the speed of the rollers so
as to prevent overlapping within the rollers.
Spaced along the channel 6 and fastened thereto are
pairs of supporting trunnions 11 supporting a shaft 12 for
In order to accommodate the machine to handle blanks
of widely diiferent widths, provision is made to feed suc
rotation relative thereto. Fixed to the shaft 12 for turn
cessive blanks at spaced intervals so that the blanks nar 25 ing therewith are a plurality of lifting brackets 13 each of
which is supported between one of the pair of trunnions 11.
rower than a given median width dimension are fed at rela
Secured to the bottom of each of the lifting brackets 13
tively short intervals and those wider than this dimension
and extending forwardly is a lip 13a forming a ledge which
are fed at longer intervals. This is accomplished by only
supports the front edge of the stack of blanks B above the
feeding the blanks to the rollers upon alternate or every
feed table.
other stroke of the reciprocating speed mechanism. This
Fixed to the end of the shaft 12 projecting outwardly of
prevents the overlapping of the blanks within the pull
rollers and in this manner the time interval between the
the tab-1e 1 and supported between trunnions 11 is an
feeding of blanks of different widths is ef?ciently accom
actuating lifting bracket 14 provided with the forwardly
extending lip 13a and having a rearwardly extending arm
plished. This type of alternating feed of the blanks is
generally designated as a skip feed mechanism.
To achieve the alternate feeding, conventionally the
35 15 formed with a yoke 16.
Turnably supported within
the yoke 16 by a stud 17 is an eye bolt 13 into‘ which there
is threaded the end of a plunger 19 of an air cylinder 20.
front edges of the blanks are raised above the feed mecha
Encircling the body of the air cylinder 20 is band 21
nism once for every two strokes of the latter so that it is in
carrying diametrically opposed rotatable pins 22 on which
effective to engage the front edge of the blank during its
forward or feeding structure when the stack is elevated. 40. there is fastened as by a force ?t one end of supporting
It is an object of the present invention to provide an
arms 23. The other end of the arms is adapted to rest
improved skip feed mechanism.
on plates 24 secured to the transverse channel 6. The
It is a further object to provide a skip feed mechanism
supporting structure of the air cylinder 20 above described
permits a limited turning thereof as the plunger 12 ad
constructed and arranged so that the accommodation of
the feed mechanism to de?nite widths may be more easily 45 vances and retracts. It is also to be noted that the air‘
accomplished than heretofore.
cylinder 20 is attached to channel 6 for movement with
It is still another object of the invention to provide a
the latter. The air cylinder 20‘ is an element of the elec
new and novel stack lifting mechanism.
tro-pneumatic control system hereinafter to be described
in greater detail.
It is still a further object to provide an electro-pneumatic
50
.Forwardly of the stack lifting mechanism is the recipro
control for actuating the stack lifting mechanism.
cating feed slide 25. The feed slide 25 is suitably fastened
In essence, the invention as embodied in a printer slotter
to sliding feed bars 26 supported in grooves 17 extending
having a feed table adapted to support a stack of blanks of
longitudinally of the feed bed 1. Connected to one end
stiff material and having a reciprocating feed including
of the feed bars 26 for moving the slide to and from the
means for engaging the front edge of each blank in turn
forward edge of the feed table are cranks 50 connected to
comprises means for supporting the front edges of said
plurality of blanks above the feed table, means upon which
a rocker shaft 51 which are actuated in the conventional
the supporting means are rotatably or pivotally mounted
manner. The feed slide 25 is provided with the usual
feeding elements 25a.
for moving the blanks into and out of the path of the feed
As shown in FIG. 3, the rear end 26a of feed bar 26 on
ing mechanism and electro-pneumatic control energized by
said reciprocating means for alternately turning said sup 60 its return stroke extends beyond the stack lifting mecha
nism 4. Fastencd to the underside end 26a of one of the
porting means into and out of the path of the feed so that
bars 26 is a cam 40 which engages a switch arm 27a of a
sheets of blanks of material are alternately fed across said
limit switch 27 of the skip feed control system S.
feed table.
In the accompanying drawings,
FIG. 1 is a plan view of a feed table used in a printer
The skip feed control system S comprises generally the
65 air cylinder 20 connected by way of ?exible lines 28 and
29 to a four-way solenoid valve 30 which is connected to
a suitable air pressure supply 31. The four-way solenoid
invention.
valve 30 is electrically energized by way of limit switch 27.
FIG. 2 is a view taken substantially along the lines 2-2
of FIG. 1 showing the arrangement of the limit switch em 70 The limit switch 27 is of the type having adjustment means
slotter feed mechanism and embodying the present
ployed in the electro-pneumatic system in the present
invention.
for selectively opening and closing the contacts 36 thereof
and thereby energize the solenoid valve 30 and actuate the
3,038,720
plunger 19 of the air cylinder 20. In accordance with the V
present invention wherein it is desired to energize the lift
ing mechanism only upon alternate strokes of the feed
which are a?ixed the edge-supporting projections to move
the blanks into and out of feeding engagement with the
slide, the adjusting mechanism of the limit switch is posi
connected to said rotatably-mounted shaft and actuated by
the reciprocating feed device for moving said edge-support
ing projections to lift the stack of blanks on alternate
feeding elements, and electro-pneumatic means operatively
tioned so as to only close and energize the pneumatic con
trols upon alternate strokes when the cam 40 engages the
limit switch arm 270. Also connected in the electrical
circuit is a manually operated switch 27b which may be
conveniently mounted on the printer slotter frame for easy '
access by the operator so that manual adjustment may 10
be made.
In operation, the stack supporting mechanism is posi
tioned on the feed bed 1 to accommodate the width of the
blank by way of the conventional adjustment clamps 8
and guide rails 9. As pointed out before, the air cylinder
supported on channel 6 for raising and lowering the lifting
brackets is concurrently moved. Thereafter the feed
slide 25 is set into operation to reciprocate and when the
strokes of said reciprocating feed device so a single blank
of material is fed across said feed table on those alternate
strokes of said reciprocating feed device during which the
stack of blanks is in the feeding position.
2. In a printer slotter having a feed table adapted to
support a stack of blanks of stiff material and a reciprocat
_ ing feed device, the combination including means for en
gaging the front edge of each blank to advance each blank
in turn from beneath the stack, means for supporting the
front edges of the stack of blanks above the top of the feed
table, said supporting means comprising a rotatable shaft,
means ?xed to said shaft for rotating therewith including
projecting ledges on which the front edge of said blanks
feed bar 26 returns to its retracted position, the cam 49
engages the arm 27a of limit switch 27. The limit switch 20 rest and electro-pneumatic means connected to said shaft
27 is set to energize the circuit of the solenoid valve 30
and actuated by said reciprocating feed device for rotating
upon alternate return strokes of the feed bar 26. When
said shaft on alternate strokes of said reciprocating feed
the switch 27 is closed on the alternate stroke, the solenoid
device to move the stack of blanks into and out of engage
valve 30 is energized whereupon the plunger 19 of the air
ment with said engaging means whereby a blank of mate
cylinder 20 is retracted. The retraction of the plunger 19
rial is fed across the feed table on alternate strokes of said
secured to the lifting arm 15 of the actuating lifting bracket
reciprocating feed device.
14 turns the latter clockwise as viewed in FIG. 3 and
3. In a printer slotter having a feed table adapted to
thereby turns the shaft 12 and accordingly also turns the
support a stack of blanks of stiff material and a reciprocat
lifting brackets 13 a corresponding amount. Accordingly,
ing feed device, the combination including means for en
the stack of blanks B supported on the ledge 13a of the
gaging the front edge of each blank to advance each blank
lifting brackets 13 are elevated above the slide feed bar 25
in turn from beneath the stack, means for supporting the
so that when the latter moves forwardly into its feed stroke,
front edges of the stack of blanks above the top of the feed
it does not engage the front edge of the lower blank so that
table, said supporting means comprising a rotatable shaft,
no blanks are fed. On the other stroke, when the limit
means ?xed to said shaft for rotating therewith including
switch 27 is inoperative to energize the valve 30 and air " projecting ledges on which the front edge of said blanks
cylinder 20 as described above, the plunger 19 remains in
rest, electro-pneumatic means connected to said shaft for
its extended position so that when the feed slide bar 25
rotating the latter, and limit switch means operative on
moves forwardly, it engages the front edge of the lower
alternate strokes of said reciprocating feed device to ac
blank so as to feed it into engagement with the gate and
tuate said electro-pneumatic means and thereby rotate said
pull rollers whereupon the latter is operative to move the 40 shaft so that a single blank of material is fed across the
blank into the printer slotter for further operation thereon.
feed table on alternate strokes of said reciprocating feed
What is claimed is:
device.
1. In a printer slotter having a feed table adapted to
support a stack of blanks of stiff material and a reciprocat
References Cited in the ?le of this patent
ing feed device including feeding elements for engaging 45
UNITED STATES PATENTS
the front edge of each blank to advance each blank in turn
from beneath the stack projections for supporting the front
edges of the stack of blanks above the top of the feed table,
the improvement comprising a rotatably-mounted shaft to
2,226,588
2,289,010
2,632,644
Simpson _____________ __ Dec. 31, 1940
Greenwood ____________ __ July 7, 1942
Wockenfuss et al _______ __ Mar. 24, 1953
vi._
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