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Патент USA US3029933

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April 17, 1962
H. R. FARWELL
3,029,927
APPARATUS FOR DRYING COATED SHEET STOCK
Filed Dec. 5, 1958
3 Sheets-Sheet 1
INVENTOR
?arvy .Rus‘b’ell ,Faruje ll
ATTORNEY
April 17, 1962
H. R. FARWELL
3,029,927
APPARATUS FOR DRYING COATED SHEET STOCK
Filed Dec. 5, 1958
3 Sheets-Sheet 2
I53. 5
1N VENTOR
Bin-5y Rmiyell Fan-well
BY
ramddy?
ATTORNEY
April 17, 1962
H, R, FARWELL
3,029,927
APPARATUS FOR DRYING COATED SHEET STOCK
Filed Dec. 5, 1958
3 Sheets-Sheet 3
IN VENTOR
M
ATTORNEY
United grates Patent O?ice
1
3,029,927
APPARATUS FOR DRYING COATED
SHEET STOCK
Harry Russell Farwell, Grand Rapids, Mich., assignor to
James A. Black, Grand Rapids, Mich.
Filed Dec. 5, 1958, Ser. No. 778,337
3 Claims. (Cl. 198-434)
3,029,927
Patented Apr. 17, 1952’
2.
which pass around sprocket wheels 15 on a shaft 16 jour
nalled on the uprights 10, and also pass around sprocket
wheels 17 on a shaft 18 journalled on the uprights 11.
Another sprocket wheel 19 (see FIGURE 4) on the shaft
5 16 is connected by a chain 20 to operating parts (not
shown) of a sheet processing machine 21, which may be
a silk screen stencilling machine, and the wicket conveyor
is thus driven in synchronization with the sheet processing
The present invention relates to apparatus for drying
machine. The upper length of the conveyor travels in an
coated sheet stock, and more particularly to the wicket 10 advancing direction from the receiving end or station to
conveyor type of apparatus for drying printed sheets.
the transfer end or station, while the lower length of the
In common practice, wicket conveyors of the endless
conveyor travels in the returning direction from the trans
type are mounted horizontally for movement between a
fer station to the receiving station.
receiving station and a discharge station, the wickets on
The wickets or sheet carriers 13‘ are fabricated of
the upper length of the endless conveyor carrying the 15 stiff wire, and each comprises a pair of transverse base
printed sheets from the receiving station to the discharge
rods 22, 23 connected at their opposite ends to the blocks
station while the wickets on the lower length of the con
24 secured to links of the conveyor chains 15 and con
veyor are returning empty to the receiving station.
nected to each other by short wires 25, and spaced arms
The primary objects of this invention are to provide
26 (see FIGURE 4) each comprising a loop of Wire at
improved drying apparatus of the wicket conveyor type
tached at its inner ends to the base rod 22. The sheet
which is particularly well adapted for drying sheets coated
carriers 13 project outwardly from the conveyor sprocket
by the screen stencilling process wherein the deposit of
chain 14 during their circuitous travel therewith, and are
coating material is heavy and relatively slow drying; to
inclined rearwardly-upwardly from the conveyor during
their advance trip and rearwardly-downwardly from the
that the coated sheets remain in the wickets throughout 25 conveyor during their return trip.
provide such a wicket conveyor which is so constructed
practically the entire circuit of the wickets on the con
Inner lugs 27 on the inner ends of the wickets’ arms
'26 are adapted to support stock sheets ltltl during their
veyor thus virtually doubling the drying time of the
sheets, and thus utilizing the maximum capacity of the
advance trip, said lugs 27 extending forwardly-upwardly
conveyor and in some cases enabling the use of a shorter
from the arms 26 during the advance trip. Outer lugs 28
conveyor while still accomplishing satisfactory drying of 30 on the outer ends of the wickets’ arms 26 are adapted to
the coated sheets; to provide such a wicket conveyor and
support the stock sheets 100 during their return trip, said
novel loading and unloading means therefor which are
automatic in operation, thus requiring a minimum of at
lugs 23 extending rearwardly-upwardly from the arms 26
during the return trip.
tention; to provide means for immediately and automati
A forwardly-upwardly extending loading conveyor is
cally stopping the drying conveyor in case a coated sheet 35 provided at the receiving end-——the near end as seen in
should become jammed in it, thus enabling removal of
FIGURE l—eof the drying conveyor. This loading con
the jammed sheet so that succeeding sheets cannot become
veyor comprises conveyor tapes 30 (see FIGURES l and
damaged; and in general to provide such a wicket con
3) which pass around pulleys (not shown) on the proc
veyor which is simple and reasonably economical in con~
essing machine 21 and around other pulleys 31 mounted
40
struction, and ei?cient and fully automatic in operation.
on the upper forward ends of supports 32, the tapes mov
An illustrative embodiment of the invention is shown
ing in the direction of the arrows. The supports 32 are
in the accompanying drawings, wherein:
secured by screws 33 to a cross-bar 34 having its ends
secured by screws 35 to the rearward ends of brackets 36
for drying coated sheet stock, including the wicket con
mounted
by means of bolts 37 on the uprights 10 at the
45
FIGURE 1 is a perspective view of the new apparatus
veyor, and loading and unloading conveyors associated
receiving end of the drying conveyor. The supports 32.
therewith;
extend between the arms 26 of the wickets, so that as
FIGURE 2 is a fragmentary, central longitudinal verti
cal sectional view of the transfer station of the wicket
each wicket moves upwardly past the conveyor tapes 30 it
picks up a stock sheet 109, printed side up. The loading
conveyor, seen at the far or left end of FIGURE 1;
50 conveyor is driven by mechanism (not shown) inside the
FIGURE 3 is a fragmentary, vertical sectional view of
processing machine so that it is synchronized with the
the near or receiving end of the drying apparatus, the
operations of both the processing machine and the drying
plane of section being indicated by the line 3--3 of FIG
conveyor.
URE 4; and
An unloading conveyor is mounted for removing the
FIGURE 4 is a left hand elevational view of the parts 55 dried sheets 100 from the wicket conveyor at a discharge
of the apparatus seen in FIGURE 3.
station near the receiving station, after the sheets have
Referring now in detail to these drawings, and refer
travelled a nearly complete circuit with the drying con
ring ?rst particularly to FIGURE 1, the sheet drying ap
veyor. This unloadingconveyor is mounted between side
paratus there shown is mounted on spaced pairs of up
plates 40 which are secured by rivets 41 to the uprights
rights 10, 10 and 11, 11. The near uprights 10, 10, as 60 10 at the receiving station. The unloading conveyor com
viewed in FIGURE 1, support the receiving end of the
prises conveyor tapes 42 which pass around lower pulleys
apparatus while the far supports 11, 11 support the trans
43 on a shaft 144 journalled in the side plates 40, and pass
fer end. Intermediate supports (not shown) may be pro
around upper pulleys 45 mounted on the upper ends of
vided if necessary. As shown, the uprights extend com
supports 46 secured by screws 47 to a cross-bar 48 having
pletely from the floor to the ceiling of the enclosure in 65 its ends secured by screws 49 to the side plates 41). Inter
which the apparatus is installed. The wicket conveyor,
mediate pulleys Stl on a shaft 51 journalled in the side
generally designated 12, is mounted on the uprights in an
plates 40 additionally support the upper rearward, work
elevated, overhead position so as to leave the ?oor area
ing lengths of the conveyor tapes 42. The shaft 44 has
beneath it clear for other operations and for passage
a sprocket wheel 52 (see FIGURE 4) on its outer end,
therebeneath.
70 around which passes a sprocket chain 53 for driving
The wickets or sheet carriers 13 are mounted on and
shaft 44 and conveyor tapes 42.
movable with endless conveyors or sprocket chains 14
The supports 46 for the upper pulleys 45 extend be
3,0 29,927
3
4
tween the arms 26 of the wickets so that as each wicket
wicket onto which it falls, face down, at the transfer sta
tion. When such a sheet reached the discharge station it
would, instead of being removed from its wicket by the
unloading conveyor tapes 42, depress the upper parts of
moves past the supports 24, the stock sheet thereon is
picked up by the conveyor tapes 42 and moved quickly"
downwardly out of the path of the next succeeding wicket.
To this end, the unloading conveyor is inclined sharply‘
downwardly to the rear. Because of this sharp downward.
inclination of the unloading conveyor, the sheets 1%
would normally have a tendency to leave the conveyor
tapes 42. To prevent this, weights are provided for press
ing the sheets downwardly against the conveyor tapes. 10
These weights are in the form of upper rollers 55 which.
these tapes so that one of them would strike a microswitch
65 (see FIGURE 3) mounted on one of the supports 46.
Suitable electrical connections (not shown) would imme
diately halt the operation of the drying apparatus and also
the operation of the processing machine 21, the loading
conveyor and the unloading conveyor.
It will thus be seen that the invention provides an effi
cient and fully automatic machine for drying coated sheet
stock, and while but one speci?c embodiment of the in
vention has been herein shown and described, it will be
opposite the lower pulleys 43. The upper rollers 55 are
journalled on arms 57 turnably mounted on a rod 58 se 15 understood that numerous details thereof may be altered
or omitted without departing from the spirit of the in~
cured by screws 59 to the side plates 49, and the lower
vention as the same is de?ned by the following claims.
rollers 56 are journalled on arms 69 also turnably
bear against the tapes 42 opposite the intermediate pulleys
50, and lower rollers 56 which bear against the tapes 42
I claim:
mounted on the rod 58, as shown. Torsion springs 61
1. Apparatus for drying coated paper sheet stock, com
urge both sets of arms, 57 and 60, toward the conveyor
tapes 42. A collecting box 62 for the completed sheets 20 prising: a horizontally disposed endless drying conveyor
of the wicket type wherein the coated sheets are carried
100 is mounted by means of screws or rivets 63 on the
side plates 40 beneath the unloading conveyor tapes 42.
by carriers each comprising a plurality of horizontally
spaced wire arms; electrically driven means for driving
Operation
said drying conveyor so that its upper length advances
Stock sheets 100, freshly coated on their upper surfaces 25 from a receiving station to a transfer station while its
or faces by the processing machine 21, are delivered by
lower length returns from the transfer station to a dis
the conveyor tapes 30 of the loading conveyor to the over
charge station near the receiving station, said carriers
head, Wicket-type drying conveyor, the conveyors being
depending in a rearwardly and downwardly direction from
synchronized so that each wicket or sheet-carrier 13 picks
the conveyor during said returning movement with the
up a stock sheet 100 as it passes by the receiving station, 30 sheets supported thereon by means at the outer ends of
as best illustrated in FIGURE 3. The sheets 100 make
the carriers; means for unloading the conveyor at the
their advance trip with the drying conveyor’s upper length
from the receiving station at the near and as seen in FIG
URE 1 to the transfer station at the far end as seen in
discharge station comprising rearwardly-downwardly ex
tending endless conveyor tapes disposed substantially par
allel with the adjacent carrier and having their upper ends
FIGURE 1. During this advance trip the coated sheets 35 extending between the wire arms of the returning carriers
whereby the sheets are removed successively from the
100 are supported by the inner lugs 27 of the wickets, in
rearwardly-upwardly inclined positions.
By the time the sheets reach the transfer station seen
in FIGURE 2, the coating material on their faces is no
longer tacky, but the sheets are still not dry enough to be
piled up. As each wicket makes its turn around the
sprocket wheels 17 at the transfer station, the sheet 100
carriers and moved swiftly rearwardly-downwardly on
the conveyor tapes out of the path of the drying conveyor.
2. Apparatus according to claim 1 in which weights
are mounted to bear against the unloading conveyor tapes
for pressing the stock sheets downwardly against the
tapes, said weights comprising rollers turnably mounted
thereon falls by gravity to the preceding wicket, and the
on arms pivotally secured to a frame adjacent the con
sheets make their return trip with the lower length of the
veyor tapes.
45
drying conveyor, resting on the outer lugs 28 (now the
3. Apparatus according to claim 1 wherein means is
lower lugs) of the wickets, in rearwardly-downwardly in~
provided for automatically stopping the conveyor if any
stock sheet adheres to its carrier to the degree that it de
clined positions.
When the completely dried sheets 109 reach the dis
presses the upper parts of said unloading conveyor tapes,
charge station near the receiving station, as seen in FIG
said means including a switch arranged to be contacted
URE 3, the unloading conveyor tapes 42 which extend 50 by a portion of said stock sheet between the conveyor
upwardly between the wire arms 26 of the wickets, pick
tapes and said switch being adapted to be included in an
up each sheet from its wicket and carry the sheet quickly
electrical circuit to said drying conveyor driving means
downwardly and out of the path of the next succeeding
whereby to interrupt said circuit when contacted by said
wicket. The weighted rollers 55 press the sheets 100 55 stock sheet.
down against the tapes 42 during this downward move
References Cited in the ?le of this patent
ment, and the sheets are ?nally piled up in the collecting
UNITED STATES PATENTS
box 62.
Means are provided for immediately and automatically
1,736,866
Wagner et al. ________ __ Nov. 29, 1929
stopping the apparatus should any sheet become jammed 60 2,575,744
Burt ________________ __ Nov. 20, 1951
in its wicket, so that the trouble can be corrected, and so
as to prevent damage to succeeding printed sheets. Such
2,706,552
2,787,363
Key ________________ __ Apr. 19, 1955
Howdle ______________ _.. Apr. 2, 1957
141,832
Great Britain ________ __ Apr. 29, 1920
jamming might occur if for some reason the coated face
of one of the sheets should remain slightly tacky by the
time it reached the transfer station and thus adhers to the 65
FOREIGN PATENTS
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