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Патент USA US3076375

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Feb. 5, 1963
A. s. TAYLOR ETAL
3,075,365v
MACHINE FOR SLITTING TISSUES
Filed April 7, 1958
I5 Sheets-Sheet 2
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INVENTORS.
ARTHUR s. TAYLOR
BY
WILLIAM R xo/v/zzEwskd
WWW
A TTORNEY.
‘ Feb. 5, 1963
A. s. TAYLOR ETAL
MACHINE FOR SLITTING TISSUES
Filed April 7; 1958
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3,076,365
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INVENTORS.
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ARTHUR s. TAYLOR,
BYW/LLIAM R KONAZEWSKI,
I
ATTORNEY.
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United States Patent
1
3,076,365
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Patent-ed Feb. 5, 196a
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but the feeding of the tissues to the-slitting mechanism
3,076,365
i‘pr'esented unsolved problems. i
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It has now-been found that the tissuemay be slit into
Arthur S. Taylor,’ Spring Valley,’ and William P. Kona
plies‘of practically the full length of the starting tissue
zewski, ,Pearl ; River, N._Y., assignors to American 5 ‘and ofacomparatively full width, orany narrower de
'Cyanamid Company, New ,York, N.Y., acorporatron
MACHINE FOR SLITTING TISSUES
of Maine
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sired width down to less than 2 millimeters, by using a
novel ‘hydraulic orientation system, and’ a novel cutting
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Filed Apr. 7, 1958,,_Ser._No..726,833
I system‘in cooperation. Conveniently plies of 4 to 6 milli
' ‘3 Claims- .wl- 83-63)
‘meterlwidth are preferred, asitheseare narrow enough for
This invention relates to a machine for slitting tissues, 10 ':most suture sizes, and are'strong enough to be handled.
fl‘hetissue .mayhbe chromed before slitting ifv desired.
particularly membranes from the intestines of animals,
for subsequent treatment and‘twisting to form ‘surgical
Chromegtreatment toughens the tissue‘ sonarrower plies
maybe slit and handled.
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sutures, ligatures, or strings for ‘musical instruments, or
sports equipment.
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i The orientation system provides a restricted feed
‘ 'This‘applic’ation is aycontinuation-in-part of application 15 throat in ‘which hydraulic jets, operating on the tissue,
.spread thetissue uniformly both longitudinally and later
),ally, and provide a ‘hydraulic feed system which gives
Serial No. ‘585,878 ?ledMay l8; '1956,.n"ow Patent No.
2,850,763 dated September 9, 1958, Method of Slitting
Tissues‘.
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. great uniformity of feed.
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.The slitting system itself consists of a plurality of paral
such as beef, calves, sheep'or‘swine. Usually the strips 20 ,lel?exibly. mounted disc knives working againsta smooth
- Thetissues to be'slit are conveniently from animals
are from the intestinal tract of animals and ‘may be either
the inner or thelouter layer, or both ‘layers, of any portion
“surface/roller which uniformly slits the tissue.
of animal ‘intestines: ‘Conveniently the outer layer of
vstood,‘ a particular modi?cation. of our method, and ap
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paratus for cutting tissue, is illustrated in'the accompany
‘ part of a beef gut‘is used;= The smallintestirle is fre
quently spoken of asbeef rounds, and the outer layer or
serosav tissue “layer from the beef round‘ may be used.
25 mg ‘drawings and the following descriptio .
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n‘ ,gt tliegslitting and feeding mechanism.~
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' FIGURELZ, ‘is aside ‘view partly in section of the slit
Wn'gQand‘feeding mechanism together with its associated
The ' whole serosa 30
f'hydraulic feed‘lines and storage tanks.
‘tissue, which may be up‘ to ‘nearly 3 inches wide, or-nar
_ ‘_
FIGURES“ alongitudinal sectional view of'the' slit
row portions, may be selected and slit. , Similarly‘ selected
‘ portions of tissues from other animals ‘such as the sub
In the drawings:
’_ ‘Iv EIGUREI' shows a pictorial view .partly broken away
The beef serosa may be from about 100§feet for bulls
and steers, ‘to about 135 feet ‘long ‘for cows; "Usually
the ?rst 60 to 80 feet or so has fewer blemishes ,and
,‘therefore is the preferred portion;
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order thatv the invention may be more readily under
itingpnandgfeeding mechanism on an enlarged scaleialong
qylaliea=a ofjEI?GUREyl.
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mucosal ‘layer of the sheep intestines may‘be used.
The US. ,Pharmacopoeia'XV requires that the surgical 35 f;
a viewnalong line ‘45-4 of FIGURE}
showing a cross’section of‘ the orientation plates. ' ,
sutures be a strand preparedfrom collagen derived from
FIGURE ‘5‘ ‘is ‘a detailed view partly ‘broken away of
For purposes of convenience the starting material is
" FIGURE'6 isia partial‘sectional view of'one modi?ca
referred to astissues. The tissues. are slitiinto ribbons or
healthy
mammals.
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qiseuainjgrsn assembly,v
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.plies which are ,hereafter termed .plies‘. The plies are 40 'tion orrhe' cutting 'roll'on anjenla'rgea scale. ‘
\‘IYEFIGUREJ is ‘a'lpartial sectional view on an enlarged
from about. 1 to 2 millimeters in ,Width‘up tothe full
“ ‘scale “of ‘another'_'modi?_catioii' ‘of ‘ the earring roll for ' nar
,-width that can ‘be. ‘secured fromTthe'tissues being slit.
‘For surgical sutures, particularly for?ne work suchas
‘JLTLFIJGURE ‘8' is‘an enlarged sectional 'view‘of an auto
eye ‘surgery, it is desirable that the plies be narrow. cPlies
atie'_‘feeding modi?cation‘iifo'r'large scale operation in a
ash-arrow as 1.,or.2.millimeters may be?twisted together
H‘h“
, toform sutures assmall as‘, ,6/0. _ Wider plies or a larger
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‘location'similarto FIGURES." “‘
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For purposes of vconvenience the'present slitter will be
i‘des'lcrib‘e‘d’foi' 'use‘inslitting" beef serosa tissue from beef
‘rounds into'pIies of about 4 millimeter’widthfor sm'all
‘instruments 'or .ga'mejrackets. , For, example tennis, or
, badminton or squash racketsv are‘preferably ‘strung, with 50"‘suturesl"“"Obviouslyfliy modifying the size of thema
"chine,'particularly ‘the feedthro'at, and the slitting' blade
i a comparatively,‘large‘diameter‘gut string.
?n‘umber o‘flpliesmay be twisted together to form larger
strings lfor'jlar‘ger ,s‘utures ‘orffor. strings used“ in musical
1 “The plies whentwist‘ed regétheriressualiy referred‘ to
as strings, and may be ‘polished,"o_r‘sizedand chromed,
. isp'acing, anyidesired width plies can he ‘slit from'anyxc'ol
Iagenous tissue suitable for sutures or strings;
.
‘The slitting operation‘is conducted wet,‘ that is, the
‘to"“formi a?‘rstrin'g for‘ a, small size suture. Sutures are 55"tissueiis‘st0red under water,‘ which may have‘a s’alt1dis
‘i usually‘ moreunifo'rm in'fdiai'rie'teri'inand strength‘, and —’.solved:therein',‘and' the spreading and slitting operations
, lb‘r otherwise treated. " At times"; singleply may be "twisted
‘are conducted in‘ a t?ood of water although'converiien'tly
‘' stronger if-‘twi'sted 'rrem‘ niore'than‘ one ply; " In‘the
past» the ‘limitations Iof r‘slitting have" v'riecessiarily required
that the plies be wider than might otherwise vbe'desired.
1'? WithTprevious'machines‘it has been di?icultiorinipossible
the ‘spreading and slitting ‘mechanisms-are aboveethe'su-r
60a\_*-:f'-“:
rTfacepf'the’Watei"If?
in , 2: in" the
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‘ operating
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tankr“
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the ‘slit plies which 3 areas vn'ar'row l‘as‘ would‘be" desired.“- 1
' In the past ‘tissues, which when'wet‘are'tough‘and very v
' ‘slippery and difficult to handle“; have been :slit .overrsta
' ‘tio'na'ry knives"fon."slittiri'g “pegsss?chi as‘ described 'in the
' U.S. patent to Valentine et lal.,' 2,720,678,"?Apparatris ‘for
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he tissues are" inl'a tank '111 as shown-in FIGURE 2.
11h ltli'e‘ ‘taiikis'a'base plate 1-2,‘ which ‘may, be ‘part of
ifthé’l?qo‘ridfithe ‘tank’ but 'is conveniently'separate.‘ -E'x
65fiten'din‘g-‘vertica‘lly from the base plate is'a ‘main frame 13.
Separating the Membranes of Animals lntesti'nes.”
f‘lnftlie back ‘of the mainframe ‘is ‘a second ‘vertical frame
>_ The‘ frictioriiin‘the'cutting khnivesuand1 the variation in . a-"ealled the-back frame 14.‘ Journaled in these two'f'ra‘mes
tension ‘tlie plies‘induced'variations in width andgave
net, ri characteristicshiid raggedl‘eid'gies' re the ‘plies. t At
; and ‘ente‘nding forwardly therefrom is ‘a, tissue support roll
“"sLliaft'ISQ The"tissuew'isupport'roll shaft has-the'r‘ebn‘a
" i s“ have heen‘made'toiuse mechanical ‘slitting knives m'tiri‘ve gearj16 which‘ gear-is‘ driven by ai'drive train’ 17
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award-dais‘.wprslitihérsllbr
i’whicli in’ turn is driven by a chain drive 18." iThe' variable
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speed motor 19>drives the chain through a variable reduc
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sarily, uniform. At times it is desirable that the outer
tion drive 20. The variable speed motor and variable
drive are such that any desired surface speed of the tissue
‘support roll ‘may be obtained.
Mounted on the tissue support roll shaft 15 is a-tissue
knives have a slightly vwider spacing so that tissues which
taper towards the edges may be slit into plies of uniform
cross-section. The plies from near the edges of the tissue
support roll 21. The tissue support‘ roll is preferably of
desired size of string. The spacers may also be of a
resilient material, and if resilient may be of such diameter
as to partially bear against the tissues being slit, so as
a hard material such as steel. This roll as well as the
metal parts of the rest of the machine are conveniently
of stainless steel or other non-rusting material.
The surface of the tissue support 'roll is smooth .with l0
out grooves. At the top of the main frame is an upper
may be thinner, so a wider ply is required to make a
to give additional traction to the rolls.
The pressure between the slitter roll and tissue support
roll is controlled by moving the position of the eccentric
shaft handle which changes the pressure on the hold down
pins 32 which forces the two rolls together.
Also mounted on the mandrel shaft is a slitter roll
the tissue support roll shaft 15 is journaled in the out
board frame 23 by an outboard frame bearing 24. In 15 driving gear 44 which is driven by a support roll gear 45.
the inner side of both the main frame and the outboard
Tissue Feed
frame is a bearing block slot 25. In the bearing block
Adjacent
to
the
bite
of the rolls is a tissue feed system.
slots are bearing blocks 26 in which is journaled a mandrel
An orientation plate support bracket 46 is attached to the
shaft 27. On top of the upper cross frame are two eccen
main frame and supports a bottom orientation plate 47
tric shaft bearings 28 in which is journaled an eccentric
and a cover orientation plate 48. The orientation plates
shaft 29. The eccentric shaft has thereon an eccentric
are conveniently of a transparent plastic such as methyl
shaft handle 30. Mounted at the ends of the eccentric
methacrylate, so that the motion of the tissue between
shaft are hold down washers 31 which bear on the hold
them .may be observed. The bottom orientation plate has
down pins 32. ‘The hold down pins rest on the bearing
25 a slot 49 therein, as shown in FIGURE 4, in which the
blocks 26 and force them downward when the handle is
cover orientation plate ?ts. The cover orientation plate
moved forward thereby controlling the downward pres
cross frame 22. Extending downwardly from the upper
cross frame 22 is an outboard frame'23.
The end of
sure on the mandrel shaft 27, and the cutting pressure
is positioned by the edges of the slot and positioning pin
50 and held in place by a lock plate 51, which rotates into
As shown in FIGURE 5 a resilient sleeve 33 surrounds 30 grooves in the support bracket 46. Other retaining means
'may be used.
the‘mandrel‘34 which may be an integral part of‘ the
In the cover orientation plate 48 is a tissue feed slot
mandrel shaft as shown in FIGURE 5,, or built-up there
52.
The tissue feed slot in the cover orientation plate and
on. The resilient sleeve is of a resilient material such
the bottom orientation’plate together form a tissue feed
as rubber or neoprene. Polyurethane of about 90 durom
throat 53 through which the tissues to be slit are fed.
eter makes a particularly long lived resilient sleeve. The
polyurethanes are being increasingly used instead of rub 35 The width of the tissue feed slot is slightly greater than
that of the tissue being slit. Inasmuch as tissue width
her where long lived resilience is required. The resilient
varies both within a species, and between species, several
sleeve is preferably vulcanized to the mandrel although
widths of tissue feed ‘slots in different cover plates may
it maybe merely slipped thereon. The resilient material
be used for greater versatility.
is preferably ground to size and concentricity. Mounted
Both the bottom orientation plate and the cover orien
on' the resilient sleeve are a plurality of circular knives 35.
tation
plate have beveled ends 54 to permit the front end
These knives should be of uniform size and shape. The
of these plates to extend nearly into the bite of the rolls
cutting edge conveniently has an included angle of about
that is the convergency of the two rolls towards their line
7909. A sharper knife with a cutting edge of 455’ or less
of tangency “on the feed side. The bottom orientation
may be used, but an angle of greater than 45?’ gives a better
plate’ha‘s a central liquid ori?ce 55 to which leads a bot
reinforcement for the cutting edge and gives longer life.
tom spreading feed line 56. This may be a pipe which is
Single ‘beveled edge knives may also be‘ used. Between
threaded into‘ the bottom orientation plate together with
.the knives may be assembled a group of spacers 36. The
on the tissue.
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spacers 36 are of such thickness that when added to the
a ?exible tube to control valve 57 in a liquid supply mani
thickness of the knives the cutting edges of the knives are
spaced apart a distance equal to the desired width of cut.
For narrow plies the knives may be mounted adjacent
to each other as shown in‘ FIGURE 7. Preferably, either
fold 58. The cover orientation plate 48 has an upper
central ‘liquid ori?ce 59 to which is attached an upper
the‘circul‘ar knives or the spacers have a recess 37 so that
a the resilient material may '?ow thereinto when the knives
are radially displaced.
" Each knife is thus resiliently positioned so that when
the ‘slitter roll 3,8 formed by the knives on the mandrel
spreading liquid feed line 60 which in turn is attached to
a control valve 61 in the manifold 58. The central liquid
ori?ces are spaced opposite each other and spread the
tissue by the flowing of liquid through them. When beef
serosa tissue or other tissue is placed between the two
plates, and liquid is supplied through the two central
liquid ori?ces, the two jets of liquid oppose, and liquid
?ows outwardly, so that the tissue is spread out gently
ties" in either'the knives or the tissue support roll is com 60 but ?rmly. By Bernoulli’s theorem the pressure is low
est nearest the ori?ce, and hence the tissue is centered and
pensa'ted by the resilience of the mounting of the cutting
is pressed against the tissue support roll 21 any irregulari
knives and cutting contact is maintained between each
knife and the tissue support roll at all times. The knives
and spacers are positioned on the resilient sleeve by a
stabilized.
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' Additional supply lines for liquid may be used as shown
in FIGURES 2 and 3. A brake ori?ce 62 is formed in
ring 39_ at one end and a retaining ring 40 and retaining
nut 41 at the other end. One end of the mandrel has
the bottom orientation plate by cutting a rearwardly
changes of spacers‘to give different width of plies. The
valve ‘67. A liquid flow through the front spreading
extending ori?ce into the throat face of the plate con
nected to a brake ori?ce feed line 63, running to a brake
a'?auge 42 thereon and the other end has threads 43
ori?ce control valve 64 which in turn is attached to the
thereon. By having disc circular knives mounted on the
manifold 58.
resilient sleeve it is possible to have the knives spaced
very'close together-Jess than 2 millimeters-and there 70 A front spreading, ori?ce 65 may be used in the bottom
orientation plate 47 near the roll end. The front spread
are no crevasses in the working parts in which fragments
ing ori?ce has attached thereto a front spreading ori?ce
of tissue may lodge. Further the slitter roll may be con
feed line 66 running to a front spreading ori?ce control
veniently and quickly disassembled for cleaning or for
spacing between the knives is conveniently, but not neces 75 ori?ce may be used in conjunction with the ?ow through
8,076,365
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upper and lower central liquid ori?ces to control the
best spreading. A water pressure of from 30 to,40 lbs.
per square inch with a quarter horsepower centrifugal
pump works very well. The liquid supply to the brake
ori?ce may be controlled to slow down the feed of the
tissue and ‘the front spreading ori?ce may be used to
assist in spreading or to speed up the supply of tissue
to the slitter roll as required, particularly during the in
spreading of the tissue as it passes through the tissue feed
throat. The front spreading ori?ce may be given an in
clination in a forward direction if it is desired to give
additional impetus to the tissue as it is fed through the
slitter
roll.
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After the tissue passes the slitter roll, it passes to a dis
charge trough 68. The discharge trough may be formed
itial threading operation.
Usually this ori?ce is not
of a ?at sheet of material with trough vsides 69. At
needed and the central liquid ori?ce and the upper cen
tached to the upper face of the discharge trough is a 10 tral liquid ori?ce supply su?icient liquid ?ow for proper
removal jet plate 70 which is a thin sheet of metal extend
feeding of the tissue to the slitter roll, once slitting is
ing nearly into the discharge bite of the rolls and which
started.
may be either adjacent to or rest on the support roll.
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The cleaning spray jet is used to keep partial plies or
other debris from accumulating on the slitter roll. In
asrnuch as the width of the tissue varies, certain plies
Under the removal jet plate is a removal jet 71 which is
supplied by a removal jet feed line 72, the ?ow of liquid
to which is controlled by a removal jet control valve 73.
at the edges of the split tissue are defective and discon
.‘Ihe removal jet plate and the removal jet are so posi
tinuous. These plies may be permitted to accumulate in
tioned that liquid supplied through the feed line to the
the tank and are drawn by the How of liquid down against
jet ?ows away from thecutting rolls, and as tissue is dis
the strainer 78 from which they are removed from time
charged from the cutting rolls it is picked up by the 20
moving liquid and drawn away from the slitting mecha
As shown the bite of the rolls is conveniently slightly
nism. ’‘ The removal jet plate prevents the plies from ad
above the liquid of the tank, and the supply of liquids
hering to the tissue support roll. The, discharge jet aids
to the various ori?ces co‘ntrols‘the feeding of the tissue.
to
in removing the plies uniformly, and in insuring uniform
tissue
feed;
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time.
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The tank may be ?lled above the level of the rolls and
the entire operation conducted submergedY The tank
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Adjacent to the slitter roll 38 is a cleaning spray jet 74,
‘which consists of a comb of a plurality of jets attached to
liquid may be water, or saline water; other liquid can be
used, ‘but water is most economical.
a‘spray jet manifold 75 which in turn is supplied by a
spray jet feed line 76, the flow of which is controlled by
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Any ‘tissue of any length suitable for the formation
of plies maybe slit rapidly.
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‘ a spray jet control valve 77.‘ _ ,One jet cleans between each 30
Tissues may be slit at speeds of from less than‘ 10 feet
pair of cutting knives.
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perminute to over 150 feet per minute. A higher liquid
The cleaning spray jet ispused to wash debris from the
slitter roll. It also prevents plies, particularly defective
plies, from wrapping around the slitter roll’ and jam
ming it.‘
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pressure is required at the higher slitting speeds. ;Ori
?ces ofvla inch diameter are convenient for full width
35 beef serosa.
‘ As shown in FIGURE .2 at a ‘discharge end of the tank
11 is a strainer 78 to‘ keep debris from ?owing into the
pump sump 79. A pump 80 draws liquid from the pump
sump through a pumpfeed line 81 __and‘_discharges' the
liquid through the pressure line’ 82,"wlii‘ch supplies liquid
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Formere rapid feeding and handling operations, aux
ili‘ary jets may 1be used to control the threading or feed
ing of the1 tissues. These jets may direct the tissue into
One
40 the tissue feed throat, and into the bite of the rolls.
such ‘alternative auxiliary feed system is shown in FIG
to the liquid supply manifold 58. Obviously, the details
of the piping system maybe yaried to conform tojspace
‘URE 8. A threading jet slot 83' is cut into each of'the
orientation plates, to ‘which ‘liquid is supplied from a
requirements of .the. site_,of installation.
threading jet chest_84, ‘supplied’ in turn by a'threading
Operation
In operation the ‘end of the tissue is placed over the
front of the’. cover, orientation plate, which is removed
for this operation,_and._the ..CQV§I.' iqrientatio? Plat? Placed
in position inthe bottom orientation plate and thelock
plate._c1osed toretain the plate in position. The eccen~
1%‘ inch jets may be’used for narrower
tissues.
liquid line 85. _ ‘During the threading of tissue, liquid is
supplied under pressure, through these threading jet ‘slots,
and‘ pbyethe Yenturi actionhliquid, and the end of the
tissue, is drawn ,through‘ the tissue feed throat, and fed
to the slitter roll;
50
For large scale operations, a light source 86 may be
, placed beneath the transparent orientation‘ plates, which
vshinesron a photocell 87. The light beam is interrupted
when atissue is passing through'the throat. A timer 88
tric shaft handle .is. moved to. release pressure on the
slitter‘ roll. "Liquid is supplied. to ,both the central liquid
ori?ce and the upper central liquid ori?ce, the flow being
‘controlled ‘by the respective control valves. The ?owing 55 i is‘ activated‘from th‘e photocell, and controls a hold-down
solenoid 89, and a spreading control valve 90‘ and a
liquid spreads the .tissueout?at and causes {it ‘to move
threading control valve 91. The‘timer is so set that the
forward towards the .biteofthe roll. The motor ‘driving
spreading control valve is closed, and the threading con
~ the rolls'is‘ turned- on,.and .as the rolls rotate the end
‘of the ‘tissue»is»»drawn..-through. them. .After. the end of
‘V-trol ,va'lve‘is open, and the ‘hold-down solenoid releases
pressure on‘ the slitter roll, in ‘normal position. When- a
the tissue has passed between the rolls, in a spread con 60 tissue‘ in’passing' through the ‘throat ‘shuts off light, the
dition, the eccentric shaft handle is moved to apply
timer, after a short delay to permit the end of the tissue
pressure and the slitter roll forced against the tissue sup
to just pass the bite of the rolls, closes the threading
port roll. The edge plies may be of inadequate width
control valve, shutting off the threading liquid supply,
or discontinuous. The central plies, of proper con
and opens the spreading control valve. This spreads the
?guration may be left connected to the unslit end of 65 tissue fully, and a short time later, when the full spread
the tissue for ease in handling, and as the rolls rotate
tissue is being supplied to the slitter roll, the solenoid
the selected plies are permitted to ?ow smoothly down
is actuated applying pressure to the slitter roll. and start
the discharge trough and then removed in due courm
ing the uniform slitting of the tissue into plies. When
for further treatment. The plies may be separated from
the end of the tissue passes the photocell, the timer, after
the unslit end of the tissue at any convenient time. As 70 ‘a short delay to permit the end of the tissue to be slit.
the tissue is drawn forward by the slitter roll and the
releases the hold-down solenoid, opens the threading
tissue support roll, the tissue is slit as it is uniformly fed
control valve, and closes the spreading control valve, re
and spread out by the liquid supplied from the central
setting for the next tissue to be fed.
liquid ori?ce and the upper central liquid ori?ce. The
Other minor modi?cations may be made, and me
rate of liquid supplied to these ori?ces is controlled for 75 chanical equivalents substituted throughout without de
3,016,365
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.threading .ori?ce when the throat .is empty, and to the
braking ‘ori?ce when material is present, with a time de
following claims.
lay to permit ends of the material to pass completely
We claim:
,
through the feed throat ‘before switching liquid feeds.
1. A hydraulic feed for a tissue slitter comprising: a
3. Apparatus for slitting tissue comprising: a smooth
bottom orientation plate at least part of which is trans b1
tissue support roll; and mounted parallel to said tissue
parent, a cover orientation plate at least part .of which is
support roll, a slitter roll comprising a mandrel, a resilient
transparent, means to support said plates slightly sepa
sleeve on the mandrel, a plurality of circular knives in
rated from and parallel to each other, thus forming a
dividually mounted on said sleeve, with the .cutting edges
tissue feed throat, opposed liquid ori?ces passing per
pendicularly through each of said plates, means to supply 10 of the knives in contact with said tissue support roll; and
‘parting from the spirit of the invention as set forth in the
a tissue feed throat comprising two parallel plates at least
a liquid under pressure to each of said ori?ces, an addi
part of each of which is transparent having ?at surfaces
slightly separated from each other and parallel to the
axes of said rolls, with one pair of edges of said surfaces
tional separate tissue spreading ori?ce in at least one of
said plates, a threading ori?ce in at least one of said
plates directed in the direction of tissue traveling through
the tissue feed throat adjacent the entrance to the throat, 15 adjacent to and discharging a fed tissue towards the line
of tangency, on the entrance side of said tissue support roll
a braking ori?ce directed opposed to the direction of
and said slitter roll, said ?at surfaces having opposed liq
tissue travel to regulate the tissue feed speed, means to
uid ori?ces therethrough, threading ori?ces in each of
control liquid supply to said threading ori?ce, and alter
said plates, directed in the direction of tissue travel, all
natively to said opposed ori?ces, said spreading ori?ce,
and said braking ori?ce, slitter means located adjacent the 20 ori?ces being on a centerline of such surface which is
perpendicular to the axes of the rolls, means to supply a
exit of the tissue feed throat, and means to pass a beam
liquid to each of said ori?ces and including time delay
of light through said transparent parts of the orientation
means, slitter controlling means operating the separation
plates, 9. photocell to detect interruption of said light
of the slitter and support rolls to permit the easier ini
beam, and control means, including time delay means,
tial
passage of tissue therebetween and photoelectric con
activated by said photocell, and governing said means
trol means comprising a light source and a photocell
to control liquid supply, whereby the photocell senses the
aligned with said transparent parts of said plates which
presence of tissue in the tissue feed throat and activates
senses the presence of tissue in the feed throat and oper
ates in timed sequence by way of the time delay means
the control means, which after a time delay to permit
the front end of the tissue to pass the slitter means, sup
plies liquid under pressure to the spreading ori?ce, the 30 said liquid supply means to supply liquid to said op~
posed ori?ces, and also said slitter controlling means to
opposed liquid ori?ce and braking ori?ce for spreading
close said slitter roll and support roll into cooperation
and feeding the tissue and stops the supply of liquid to
with one another after the tissue has been fed therebe
said threading ori?ces, said control means, on the ad
tween; said liquid supply and slitter control means operat
vance of the trailing end of the tissue past the photocell,
ing, in the absence of tissue in the feed throat, to stop
being activated after a time delay to permit the trailing
the liquid supply to the opposed ori?ces and separate the
end of the tissue to pass the slitter means, stops the flow
slitter and tissue rolls, and initiate the liquid supply to
of liquid under pressure to the spreading ori?ces, the 0p
said threading ori?ces.
pOsed liquid ori?ce and braking ori?ce and initiates the
liquid supply to said threading ori?ce.
References Cited in the ?le of this patent
2. A hydraulic feed comprising: a bottom orientation 40
plate at least part of which is transparent, a cover orienta
tion plate at last part of which is transparent, means to
support said plates slightly separated from and parallel
to each other, thus forming a feed throat, opposed liquid
ori?ces passing perpendicularly through each of said
plates, means to supply a liquid under pressure to each of
said ori?ces, a threading ori?ce in at least one of said
plates directed in the direction of travel through the feed
throat adjacent the entrance to the throat, a braking 50
ori?ce directed opposed to the direction of travel, to regu
late material feed speed means to control liquid supply
to said threading ori?ce and alternatively to said opposed
ori?ces and said braking ori?ce, and photoelectric con
trol means comprising a light source positioned to pass
a light beam through a transparent part of said plates and
a photocell which senses interruption of said light beam
and hence the presence of material in the feed throat and
operates said means to control the liquid supply includ
ing time delay means to feed liquid under pressure to the
55
UNITED STATES PATENTS
135,266
519,685
1,185,790
1,319,219
Crocker _____________ __ Jan. 28,
Reyels et a1 ____________ __ May 8,
Greising et a]. _________ __ June 6,
Hickey _______________ _- Oct. 21,
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Anderson et al. ________ __ May 2, 1933
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Birch _______________ __ July 31,
Little _______________ __ Apr. 21,
Lamb et a1 ____________ _._ Oct. 17,
Ritzpatrick __________ __ Aug. 19,
Muller _______________ __ May 5,
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2,920,520
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Cousino ______________ .._ Jan. 24, 1961
1934
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1939
1952
1953
1956
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1958
1958
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