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Патент USA US2121902

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June 28, 1938.-
w. E. C'RIST, JR
I Filed Nov. 19, 1956
>jf‘Patented Junef28, 1938.~
> i i
a : 2,131,992 .,
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cast; Jr.,"spiingne1a; "ohi'oj"v -
I .I- Application November 1
present instance.
T. . .r
arei= carriedliby
~. ,
5 Claims.
This."inventi'oni-lrelates- toe'an {apparatus for
‘maintaining a tension upon" material-being un
~brackets~fl 5 which'rare connected with- the “press
..-.wound.;from.a1--reel,1 such for instance as upon a frame _members 7| ' by: bolts» as-shown in, Fig‘J'Z.
.IOIli-“O'f paper-which isjbeing fed to a- printing ‘For each‘of- the pins‘ill4 lthe'backing- plateli2’fis _."f . V
7 $35 :pre‘sspfor'whichlpurpose it is particularly adapted. providedwithva sleeve ‘16% each-sof- whichw'slides‘ij‘b
a ’
.;.~..!I‘he' solziii'ect?o'f'theéinvention'istofpf'oVidelanv Ziupon Iitsi» .correspondingmin, these s'leevesu‘bein'g
.;_~‘-apparatus:.for thespurposegspeci?ed which will be
simple-sin: construction vand effective'in (operation.
-In the accompanying drawing:
I" I
~..nFig; 1- :is a si‘del'elevation of an apparatus :em-~
:bodyingv my improvemena-lrtogether with a portion
7 xzoflithe zi'rarne‘ ofa'printingpress
. :' :Figx12vv is f’a .view of» ‘the-rear ‘end: of ' thief-parts
.ishown'f'inili‘ig. 1,‘. ‘some 'ofl'ithe-l'p'arts being. broken
Fig'.'3lis;a sectionron» the line 3;.3t-of Fig.2
connected toiithe iba'ckingli-pre'ferably by welding.
1" ‘As. the" roll of-paper decreases in? size the rollers
Rurge'd by the springs are kept .-in:contact-1with
the paper due to the elongation of ithesprin‘gs, iJ10
the inward movement of l-these-rollers '6 being- lim
ited by adjustablefstops in ‘the nature'of: nuts ‘I11
threaded on. rods 1 8'rwhi‘ch "extend loosely ‘through
the backing plate and are _connected ‘with-the‘;
' brackets 8, two of these stops being provided :for G1:5
‘- each roller.
' "In1 ‘order to withdraw the rollers ‘and :their
"Fig.v '5;is.a.'section<on:theiline'
4 is Ia'section on:the'line-4‘-4
5;-5 of ‘Fig.Fig. 2.»
2. -
springs to permit the installation ofla 'newiroll
' of paper there islprovided a pair of screws ~ I 9,_%_the
Fig. 6 is a section on the line E—6 of Fig. 5,
inner ends of which-are'rotatably connected withil'zo '
the backing» plate i2 as shown .‘best ‘in Fig: 65 each .
' In the present case I haveshown my apparatus’ screw havinga plain reduced-inner" end which ._
Fig?E-isatop plummet-or a part of the mecha
applied to a printingpress. The parts of the ‘passes looselythrough the backing plate and has
apparatus are all supported from the press frame, ' on each side thereof-a collar 20. Each of- these
I indicating parts of the rear portion of the screws is threaded in a bracket 2| which brackets 25"
_25 press frame and 2-are' arms which extend rear
wardly from vthe frame members I. ' The roll of
paper indicated at 3 is carried upon a shaft 4 in
the usual manner, the roll of paper having the
usual hollowiron core? (not shown) and the shaft
1; having adjustable cones which engage‘ with the
ends of the iron core, one only of these cones, 5,
are bolted to the press frame members I, and the
outer end of each screw is provided with a hand
wheel 22. When the screws are rotated in one’
direction by these hand wheels», the backing plate,
springs and rollers may be withdrawn a su?icient 30@
distance to allow the insertion of a new roll of
paper upon the shaft 4.
‘Provision is made for retarding a too free rota
p In order to apply a tension to the roll of paper tion of the shaft 4 which carries the paper roll
so that the web 3" thereof may be kept taut there by means of brake shoes 23 which cooperate with 35
is employed a series of [soft rubber rollers 6" brake pulleys 24 “which are secured to the shaft.
‘ mounted upon shafts ‘Iv rotatably supported by a , As is ‘the usual practice one of these grooved I '
pulleys is removable so that the roll of paper with
its hollow core may be ‘slipped onto the. shaft 4.
of the paper. Therollers are arranged inffric
40 tional engagement with the paper by a series of Each of these brake shoes is pivotally connected 40
springs 9_ preferably conical spiral in form; these ‘ with a threaded rod 25 the upper end of the‘rod
springs having their inner ends connected to the being slidably mounted in a sleeve 26 which has » ‘V 7
bracket 8 by bolts l0 and washers II and having a hook engagement with a pin 21 which is con
their rear ends connected to a backing ‘plate [2, ' nected and projects laterally from the arms 2 of
' preferably of'sheet metal, which is formed on the the press frame. A hand wheel 28 has a threaded
arc of a circlewhose center is the center of the engagement with each one of the rods and each
paper] roll,v the springs being connected to this bearsagainst its corresponding sleeve 26 so that
backing l2 by'hook bolts i3, three series of rollers vwhen the Wheels are turned in either direction
the frictional engagement of the brake shoes 23
‘ and springs being employed in the present in
stance; The length ‘of the backing plate i2 is with the grooved‘ pulleys may be increased or
long bracket .8, ‘the rollers being of the full width
,1 vslightly greater than'that of the width of the roll
of paper to insure applying pressure-upon ‘the
As before explained, the rollers 6 remain 'inv
engagement with the paper roll until arrested
,roll of paper near the edges thereof.'
The backing plate I2 is supported by aseries of - by the stops" l'l.w These stops are designed to act
if v.55 pins l4, four of these pinsbeing shown‘ in the before the paper. ism-exhausted and at that time, 55,
the tension of the paper, to maintain the taut
ness of the web, will be maintained by the brake
shoes 23 without wrinkling; these brake shoes
being sufficient for that purpose due to the de
creased size of the paper roll.
It should be explained that when the roll of
2. In a tensioning apparatus for a roll of mate
rial'during unwinding thereof, a roller, means
for supporting the same, 'a backing plate, a se
ries of springs between said supporting means
and backing plate to hold said roller in resilient‘ 5
engagementwith the outer surface of the mate
‘ paper is exhausted the shaft 4 is removed from
rial roll, and means to withdraw said backing
the open bearings 29 in which it is mounted,
slipped into the hollow metal core of a new roll of
plate, roller and springs to permit the insertion
10 paper and then replaced in the bearings, the
hook connection of the sleeves 26 on the studs 21
means consisting of at least two threaded rods
swivelly connected with said backing plate and
permitting them to be readily removed from the
having a threaded engagement with a ?xed part
of afresh roll of material, said withdrawing
together with means for turning said rods.
3.‘ In a tensioning apparatus for a roll of ma- '
Before a new roll is inserted, however, the
15 backing plate I2 and the rollers 6. and springs :terial during unwinding thereof, a device to en 15
which it carries are retracted in the manner
gage said ‘roll, a bracket for supporting the
before explained.
same, a backing plate, springs between said
In order to keep the upper roller 6 back of backing plate and bracket, and means for slid
the point where the web 3’ leaves the paper roll, ably supporting ‘said backing plate from a‘ ?xed
20 the web is passed about an idler roller 2" at the part.
rear end of the arms2.‘
4. In a tensioning apparatus fora roll of ma
' By the apparatus described, if the roll of
terial during unwinding thereof, a device to en
material is Wound absolutely straight at the fac
gage said roll, a bracket for supporting the same,
tory, as it almost invariably is, the roll of mate
va backing plate, springs between said backing
as rial will unwind straight and'will be fed accu plate and .bracket, and means forislidably sup 25
rately to the press, thus avoiding wrinkling of > porting said backing plate from a ?xed-part, said
the paper, avoid breakage due to too much ten
means consisting of pins on said ?xed part’ and
sion of the brake shoes on the roll of paper, will “sleeves connected with said backing, plate slid
cause the paper to be kept in proper registry ably mounted upon said pins.
.30 with the printing plates of the press, and will
5. In a tensioning apparatus for a roll of ma»
cause the knives of the press to cut the paper terial during unwinding thereof, a .roller, a
at the proper marginal points.
bracket for supporting the same, a backing plate,
Having thus described my invention, I claim: springs interposed between said bracket and
1. Ina tensioning apparatus for a rollof ma
backing plate, threaded rods connectedwith said
35 terial during unwinding thereof, a roller, means bracket and projecting loosely through said‘back 35
for supporting the same, a backing plate, a series ing plate, and nuts on said rods to contact with
of springs between said‘ supporting means and said backing plate to limit the movement of said
backing plate to hold said roller in resilient en
roller toward the center of said material roll.
gagement with the outer surface of the material
40 roll, and means to withdraw said backing plate,
roller and springs to permit the insertion of a
studs for that purpose.
fresh roll of material. .
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