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Патент USA US3021620

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Feb. 20, 1962 ’
R. WINKLER ETAL
3,021,610
APPARATUS FOR TRANSPORTING BLANKS THROUGH A DRYING ZONE
Filed Nov. 18, 1958
2 Sheets-Sheet 1
ks.
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_INVENTORS
R/c/mro/ Mnk/er and
K010‘ Dunneé/er
BY
A r roams-r
Feb- 20, 1962
R. WlNKLER ETAL
3,021,610
APPARATUS FOR TRANSPORTING BLANKS THROUGH A DRYING ZONE
Filed Nov. 18, 1958
2 Sheets-Sheet 2
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_ /€/'c/)Qrd M'mf/cr ,
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Patented Feb. 20, 1952
transporting means in the ‘form of relatively non-stretch
able chains; and to provide gripping pads which are
3,921,619
preferably incorporated in the structure of the chains.
In accomplishing these and other objects of the inven
APPARATUS FOR TRANSPGRTING BLANK§
Tim?UGH A DRYEQG ZUNE
Richard Winkler, Rengsdorf, near Neuwied, and Kurt
Dunnehier, Woliendorf, near Neuwicd, Germany, as
signors to Berkley Machine Company, Kansas City,
tion as hereinafter pointed out, we have provided im
proved structure, the preferred form of which is illus
trated in the accompanying drawings, wherein:
Mo., a corporation of Missouri .
FIG. 1 is a longitudinal section on the line 1--1 of
FIG. 2 of a tranportation apparatus for conveying enve
Filed Nov. 18, 1958, Ser. No. 774,678
4 Claims. (Cl. 34—162)
This invention relates to envelope making machines,
and more particularly to an apparatus for transporting
envelope blanks through the drying section thereof to
dry the gum on ?ap portions of the blanks. For example,
10
lope blanks through the drying zone of an envelope making
machine to dry gum on the sealing ?ap‘ portions of the
blanks, the section being shortened to permit illustration
‘thereof ona larger scale.
FIG. 2 is a cross section on the line 2--2 of FIG. 1.
lapped one upon another, to leave only those portions of
the sealing ?aps exposed to which the gum is to be applied
by means of a roll applicator in the form of a continuous
band of adhesive. After application of the gum, the
FIG. 3 is a plan view of the lower chain belt and the
upper feed and discharge belts at the ends of the drying
section.
FIG. 4 is a fragmentary perspective view of a modi?ed
form of the upper chains, which utilizes pads with crowned
lapped formation. The blanks are then conveyed through
guide rails.
a drying zone at the lower portion of the machine, and
which usually extends from one end thereof to the other.
lope blanks, on smaller scale, showing separation of the
envelope machines have a section wherein blanks are 15
blanks are moved slightly apart to separate the gum on 20 gripping faces.
FIG. 5 is a perspective view of the end of one of the
one blank from the gum on the adjacent blanks of the
FIG. 6 is a diagrammatic underneath view of the enve
Heretofore, the simplest method of conveying the blanks 25 gum on the sealing ?aps.
Referring more in detail to the drawings:
through the drying zone was between endless fabric belts,
l and 2 designate upper and lower pairs of belts which
usually of cotton material. The belts were arranged in
carry blanks “a” in overlapped, slightly stepped forma
upper and lower pairs, so that the lower run of the upper
tion from a seal ?ap gumming device (not shown) of an
belts cooperated with the upper run of the lower belts
envelope making machine to the drying section 3 of the
to grip the side ?ap portions of the blanks therebetween,
machine. The belts composing each pair of belts are
and a strand was used to support the gummed side of the
spaced apart to engage the end ?ap portions “b” and “c”
sealing ?ap portions. The di?iculties of such an arrange
of the blanks “a” with the gum on the sealing ?ap portions
ment are that the fabric belts stretch under tension and
facing outwardly and downwardly at the delivery ends
vary in thickness, so that it is impossible to maintain
uniform grip on the blanks. Change in spatial relation 35 of the belts. At the delivery ends of the belts, the belts 1
have substantially horizontal runs 4 that cooperate with
ship of the blanks is not permissible at high speed. It is
corresponding horizontal runs 5 of the outer belts 2 to
obvious that this may lead to serious jamming in subse
carry the blanks “a” in alignment with the path of the
quent operating sections of the machine.
blanks through the drying section 3, as later described.
Another di?iculty is that the strand which supports the
The horizontal runs 5 are longer than the horizontal
sealing ?aps marks the‘ freshly applied gum. Another
di?iculty is that it is very dii?cult to run envelopes with
runs 4 and are guided over rollers 6.
short side ?aps, using cotton belts. A further di?icu-lty
guide the horizontal runs 4 are, therefore, offset from the
rollers 6 for accommodating pressure rollers 8 to facilitate
delivery of the blanks at the same speed and lapped rela
tion as during application of the gum to the sealing ?aps.
In order to separate the gum on the respective blanks,
is that because of the expense and complication of sup
porting numerous guide rollers, the runs of the belts are
allowed to take the form of catenaries. Therefore, to
allow room for the belts, the height of the machine
required an operator’s platform along the length of the
machine, so that the operator could reach and service the
operating mechanisms at the top of the machine.
Rollers '7 which
the blanks must be slightly separated prior to their passage
through the drying zone. This is effected by rollers 9 and
it) that operate at a higher surface speed than the pres
Machines of lower height have been constructed by 50 sure rollers 8. The blanks are removed from the drying
section between belts 11 and 12 and a center belt 13 that
using a single set of chain belts wherein the ‘links of the
carry the blanks to the sections of the machine where the
chain are provided with clips for securing the blanks,
blanks are converted into envelopes.
but these clips must be used in great number and they are
The structure thus far described is substantially conven
easily deformed, requiring constant inspection and re
placement. They are also apt to mark and damage the 55 tional and speci?cally forms no part of the present inven
tion, the present invention pertaining primarily to an ap
blanks.
paratus for transporting or conveying the blanks through
It is the principal object of the present invention to pro
the drying section 3 and the combination therewith of the
vide blank transporting apparatus that eliminates the di?i
mechanisms thatcarry the blanks to and from the drying
culties of previous structures.
Other objects of the invention are to provide means for 60 section, as now to be described.
The apparatus for conveying the blanks through the
effecting a positive clamping or gripping action without
drying section is generally designated 14 and comprises a
marking or damaging the blanks; to provide means having
lower pair of endless chains 15 and 16 that operate over
such a high coef?cient of friction that it is unnecessary to
pairs of sprockets 17 and 18 carried by shafts 19 and 2!)
support the midportions of the blanks during the drying
at the respective ends of the drying section 3, as best illus
process; to provide blank carrying means whereby the
‘trated in FIG. 1. "i‘he transporting apparatus also in
blanks are carried in a linear path through the drying
section; to provide a ‘blank transporting means which
cludes an upper pair of chains 21 and 22 operating over
guided by rails; to provide transporting means which hold
the blanks gently yet ?rmly at high speeds; to provide
for feed or guide rollers 27 and 28 to facilitate entrance
pairs of sprockets 23 and 24 carried on shafts 25‘ and 2rd
simpli?es the addition of new sections in the envelope
inset from the shafts l9 and 26, whereby the upper chains
making machine; to provide a blank transporting means of
simple construction in which the active runs of the belts are 70 21 and 22 are of shorter length than the lower chains 15
and 16 to provide spaces at the ends of the lower chains
3,021,610
4
and exit of the blanks “a” to and from engagement with
the upper and lower chains 15-16 and 21-22.
The chains 15-16 and 21—22 are of substantially the
same construction, in that they include side links 29 of
ordinary construction that connect links 30 of a form to
carry gripping elements 31. The links 3% have sides 32
and 33 interconnected by webs 34 (FIG. 4) to carry the
gripping elements 31. The gripping elements 31 are fixed
to the webs, for example by vulcanizing them to the webs
34. The links are interconnected by transverse pins 35 10
carrying rollers 36 substantially corresponding to the pins
and rollers of conventional roller type chains. (The
gripping elements 31 comprise resilient blocks or pads 37
of a rubber or similar synthetic material that does not
mark the blanks “a” when the blanks are engaged thereby. 15
The pads 37 have base portions 38 of a width and
length substantially corresponding to the webs 34 and
preferably outwardly converging sides 39 and 40 joining
with contact faces 41. The ends 42 and 43 of the blocks
or pads may extend at right angles from the plane of the 20
base portions 38 to provide clearance 44 between the
respective blocks or pads when the links are connected
stood that the sprockets 17-18 and 23-44 are also ad
justable on their shafts 19-20 and 25-26, as will be
apparent to those skilled in the art of envelope making
machines. The springs 56 may be backed by arms 63 that
are also adjustable with the guide rails.- In order to sup
port the upper runs of the upper chains, the sleeve por
tions '60 of the main brackets 59 carry laterally extending
shafts 64 mounting idler sprockets 65, as best shown in
FIGS. 1 and 2.
To support the lower runs of the lower
chains, the supports 58 may carry rollers .66, also shown in
FIGS. 1 and 2. It is obvious that as many of the main
supporting brackets and transverse shafts 62 may be used
as are necessary to carry the guide rails, idler sprockets 65
and rollers 66.
The drying medium used in the drying section of the
machine may be heated air that is conducted along the
length of the drying zone by means of a duct 67 and
discharged in contact with the gummed areas of the
blanks through perforations 68 in the upper portion of
the duct,_as shown in FIG. 2.
Assuming that the machine is in operation and that
one of the sprocket shafts 25 or 26 and 19 or 20 is being
driven to actuate the upper and lower pairs of transport
chains at the same linear speed through the drying sec
tion, blanks are delivered from the gnmming roll between
the runs 4 and 5 of the belts 1 and 2 in lapping fanned
relation, as shown at the lefthand side of FIG. 6, with
the gum forming a continuous band. Upon contact with
the rollers 9 and 10, the blanks are moved apart as shown
at the righthand side of FIG. 6, to separate the gum on
together by the pins 35. The faces 41 of the blocks of
the upper chains 21—-22 may be slightly crowned in the
longitudinal direction of the chains, as shown in FIG. 4, 25
but the pads of the lower chains are preferably hat, to
constitute linear supports for the side ?ap portions “b” and
“c” of the blanks “a” when engaged by the pads of the
upper chains.
When the chains are mounted on the pairs of sprockets 30
17-18 and 23—124, the lower runs 45 of the upper chains
the respective seal ?ap portions of the blanks. The blanks
and ‘the upper runs 46 of the lower chains are in registry
are then fed onto the pads on the forward end of the
and are retained in linear paths by pairs of guide rails 47
upper run of the lower belts with the aid of the feed
and 48. The guide rails 47 and 48 are preferably of chan
rollers 27. The blanks then enter the space that is
nel cross section to provide side ?anges 49 and 5t} and a 35 formed between the horizontal pads on the upper ‘runs of
web 51 having a width to accommodate the links of chains
the lower belts and the pads of the upper chains as they
therebetween, as best shown in FIG. 2, and the mid
move successively into position to form the lower hori
portions of the webs have longitudinal ribs or tracks 52
zontal runs of the upper chains, to cooperate with the
for contact by the rollers 36 of the chains, whereby the
pads on the upper runs of the lower chains to grip the
frictional contact faces 41 of the resilient pads are sup 40 blanks as shown in FIG. 1. With continued movement
ported in linear alignment substantially along the length
of the belts, the links carrying the pads enter the channel
of the guide rails to provide substantially equal pressure
on the blanks as they are being carried through the length
shaped guides with the rollers of the chain bearing in
rolling contact with the tracks 52 of the guide rails, so
of the drying section of the envelope making machine.
that the pads continue the grip on the blanks and pres
In order that the guide rails may be as long as pos 45 vent any relative movement thereof during transfer of
sible, the ends thereof are provided with slots 53 in regis
the blanks through the drying section. Upon reaching the
try with ribs or tracks 52, as best shown in FIGS. 1 and 5,
end of the upper pairs of chains, the links carrying the
and the ends of the ribs or tracks are shaped to provide
pads move around the sprockets 24 to free the blanks,
ramps 54 to facilitate contact of the rollers with the ribs
so that the blanks may be discharged from off the upper
or tracks as the links with the pads move around the
run of the lower chains in cooperation with the feed
sprockets and onto the tracks. In order to facilitate en
rollers 23, to feed the blanks under the lower run of
trance of the blanks between the pads of the chains and
the center belt 13 and between the upper and lower pairs
exit of the blanks therefrom, the guide rails 47 supporting
of offtake belts 12 and 11 respectively to carry the dried
the upper runs of the lower belts are preferably supported
blanks to the envelope converting mechanisms of the
at heights relative to the axis of the sprocket shafts, so 55 machine.
'
that as the blocks approach the end of the guide rails and
From the foregoing, it is obvious that we have provided
the rollers move up the ramps at the forward end of the
a substantially nonstretchable means for transporting the
guide rails, the contact faces 41 of the lower pads are
blanks in a linear path through the drying zone, and
preferably tilted at a slight angle, as indicated at 55, FIG.
that the lapped blanks are gripped and held together
60
1, and so that the pads, as they leave the ends of the guide
between the pads on the chains so that the blanks‘ cannot
rails, move away from contact with the blanks and there
shift their relative positions during transport through the
by avoid any possibility of marking the blanks.
drying section of the envelope making machine. It is
The upper guide rails 48 are resiliently backed by
also obvious that the rubber pads have a high coefficient
springs 56 to press the pads on the lower run of the upper
of friction, so that the contact faces thereof ?rmly grip
chains into contact with the blanks, to cooperate with the 65 the blanks to support the gummed portions of the blanks
lower pads in gripping the blanks therebetween and carry
in taut condition across the space between the chains
ing the blanks ?rmly through the drying section. The
without intermediate supports that might interfere with
lower rails 47 are rigidly supported on brackets 57 car
the gum or drying thereof.
ried by supports '58 that extend laterally and which are in
Another advantage is that blanks of thin and fragile
70
turn carried by brackets 5? having internally threaded
materials may be conveyed without slipping or damage
sleeve portions 60 carried on threaded portions 61 on a
thereto.
transverse shaft 62. The transverse shaft may be suitably
What we claim and desire to secure by Letters Patent is:
mounted on the side frames of the envelope machine so
1. Apparatus for conveying envelope blanks in lapped
that it may be rotated to adjust the guide rails according
and slightly stepped relation through a drying section
to the size of the envelope blanks, it also being under 75 of an envelope making machine to expose gummed por
3,021,610
5
6
tions of the blanks to a drying medium, said apparatus
including a lower pair of endless chains each composed
of interconnected links, blocks of resilient material car
ried on said links and having frictional faces for sup
tions of the blanks in substantially taut condition across
porting contact with portions of said blanks laterally
and outwardly of the gummed portions, means for sup
portingsaid lower pair of chains to provide upper runs
for continuous movement through said drying section
in laterally spaced apart parallel relation and providing
a substantially uninterrupted space between said upper
runs at least corresponding in width to the width of
the gummed portions of the blanks for the full length of
the drying section for free access of the drying medium
to said blanks, separate longitudinal guide means below
said space solely by the gripping action on said lateral
portions of the blanks while the blanks are being carried
through the drying section, and means for delivering the
blanks in said lapped relation onto said frictional faces
of the blocks of the upper runs of the lower chains.
3. Apparatus for conveying envelope blanks in lapped
and slightly stepped relation through a drying section of
an envelope making machine to expose gummed portions
of the blanks to a drying medium, said apparatus includ
ing a lower pair of endless chains each composed of
interconnected links, blocks of resilient material carried
on said links and having frictional faces for supporting
contact with portions of said blanks laterally of the
each of said upper runs for retaining the frictional faces 15 gummed portions, means for supporting said lower pair
of chains to provide upper runs for continuous movement
of said blocks in linear alignment for supporting said
lateral portions of the blanks thereupon, an upper pair
of endless chains having interconnected links, similar
through said drying section in spaced apart parallel rela
blocks of resilient material on the links of the upper
between said upper runs at least corresponding in width
tion and provide a substantially uninterrupted space
chains and having frictional faces for pressing contact 20 to the width of the gummed portions of the blanks for
the full length of the drying section for access of the
with the lateral portions of the blanks, means for sup
drying medium to said blanks, separate longitudinal guide
porting the upper pair of chains in correspondingly spaced
means below each of said upper runs for retaining the
apart relation and to provide lower runs in registry with
frictional faces of said blocks in linear alignment for
and extending longitudinally above the upper runs of
the lower chains to operate at the same linear speed, 25 supporting said lateral portions of the blanks thereupon,
an upper pair of endless chains having interconnected
guide means for backing said lower runs for pressing
links, similar blocks of resilient material on the links
the fractional faces of said blocks on the links of the lower
of the upper chains and having frictional faces for press
runs into contact with the portions of the blanks sup
ing contact with the lateral portions of the blanks, means
ported upon the frictional faces of the blocks on the
links of the upper runs of the lower chains for gripping 30 for supporting the upper pair of chains to provide lower
runs in registry with and extending longitudinally above
the lateral portions of the blanks between said frictional
faces for maintaining the gummed portions of the blanks
the upper runs of the lower chains to operate at the same
in substantially taut condition across said space solely
linear speed, said upper linear runs of the lower chains
being of longer length than the linear lower runs of the
by the gripping action on said lateral portions of the
blanks while the blanks are being carried through the 35 upper chains to project forwardly from under linear runs
of the lower chains, feed wheels cooperating with the
drying section, and means for delivering the blanks in
projecting ends of said upper runs of the lower chains
said lapped relation onto said frictional faces of the
for holding the blanks in position to be engaged by the
blocks of the upper runs of the lower chains.
blocks of the upper chains, guide means for backing said
2. Apparatus for conveying envelope blanks in lapped
and slightly stepped relation through a drying section 40 lower runs for pressing the frictional faces of said blocks
of an envelope making machine to expose gummed por
tions of the blanks to a drying medium, said apparatus
including a lower pair of endless chains each composed
of interconnected links, blocks of resilient material car
ried on said links and having frictional faces for support
ing contact with portions of said blanks laterally and
outwardly of the gummed portions, means for supporting
said lower pair of chains to provide upper runs for move
ment through said drying section in laterally spaced apart
parallel relation and provide a substantially uninterrupted
on the links of the lower runs into contact with the
portions of the blanks supported upon the frictional faces
of the blocks on the links of the upper runs of the lower
chains for gripping the lateral portions of the blanks
between said frictional faces for maintaining the gummed
portions of the blanks in substantially taut condition
across said space solely by the gripping action on said
lateral portions of the blanks while the blanks are being
carried through the drying section, and means for deliver
50 ing the blanks in said lapped relation onto said frictional
space between said upper runs at least corresponding in
faces of the blocks at the projecting ends of the upper
width to the width of the gummed portions of the blanks
for the full length of the drying section for access of the
runs of the lower chains.
4. Apparatus for conveying envelope blanks in lapped
and slightly stepped relation through a drying section
means below each of said upper runs for retaining the 55 of an envelope making machine to expose gummed por
tions of the blanks to a drying medium, said apparatus
frictional faces of said blocks in linear alignment for
including a lower pair of endless chains each composed
supporting said lateral portions of the blanks thereupon,
of interconnected links, blocks of resilient material car
said longitudinal guide means having forward ends of a
drying medium to said blanks, separate longitudinal guide
shape to tilt the links as the links engage said guide means
to facilitate passage of the blanks onto the frictional
ried on said links and having frictional faces for sup
porting contact with portions of said blanks laterally
and outwardly of the gummed portions, means for sup
faces, an upper pair of endless chains having intercon
porting said lower pair of chains to provide upper runs
nected links, similar blocks of resilient material on the
for continuous movement through said drying section in
links of the upper chains and having frictional faces for
laterally spaced apart parallel relation and providing a
contact with the lateral portions of the blanks, means
for supporting the upper pair of chains in correspond 65 substantially uninterrupted space between said upper runs
at least corresponding in width to, the width of the
ingly spaced apart relation to provide lower runs in
gummed portions of the blanks for the full length of the
registry with and extending longitudinally above the upper
runs of the lower chains to operate at the same linear
speed, guide means for backing said lower runs for press~
drying section for free access of the drying medium to
said blanks, separate longitudinal guide means below each
ing the frictional faces of said blocks on the links of 70 of said upper runs for retaining the frictional faces of
said blocks in linear alignment for supporting said lateral
the lower runs into pressing contact with the portions
portions of the blanks thereupon, an upper pair of end
of the blanks supported upon the frictional faces of the
blocks on the links of the upper runs of the lower chains
less chains having interconnected links, similar blocks
for gripping the lateral portions of the blanks between
of resilient material on the links of the upper chains and
said frictional faces for maintaining the gummed por 75 having frictional faces for pressing contact with the lat
7
3,021,610
eral portions of the blanks, means for supporting the
upper pair of chains to provide lower runs in registry
with and extending longitudinally above the upper runs
8
lateral portions of the blanks between said frictional faces
for maintaining the gummed portions of the blanks in
substantially taut condition across said space solely by
the gripping action on said lateral portions of the blank
of the lower chains, said upper runs of the'lower chains
being of longer length than the lower runs of the upper
while the blanks are being carried through the drying
chains to project beyond the respective ends of the lower
section, and means for delivering the blanks in said
chains, feed wheels cooperating respectively with the
lapped relation onto said frictional faces of the blocks
projecting ends of said upper runs of the lower chains
at the projecting ends of the upper runs of the lower
for facilitating entrance and exit of the blanks, guide
chains.
means for backing said lower runs for pressing the fric 10
References Cited in the ?le of this patent
tional faces of said blocks on the links of the lower runs
UNITED STATES PATENTS
into contact with the portions of the blanks supported
upon the frictional faces of the blocks on the links of
the upper runs of the lower chains for gripping the
2,770,176
2,771,206
Novick _____________ _._ Nov. 13, 1956
Daniels et al. ________ __ Nov. 20, 1956
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