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Патент USA US3025750

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March 20, 1962
M. SORKIN
INTERMITTENT WEB FEED MECHANISM PROVIDING
LOW VELOCITY FEED PRIOR TO STOPPAGE
Flled. Oct
3,025,740
25, 1957
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United States Patent 'O?iice
1
3,025,740
Patented Mar. 20, 1962
2
To accomplish the foregoing general objects, and other
3,025,740
more speci?c objects which will hereinafter appear, my
I
INTERMITTENT WEB FEED MECHANISM PRO
VIDING LOW VELOCITY FEED PRIOR TO
STOPPAGE
invention resides in the intermittent web feed mechanism,
and the elements thereof, and their relation one to another,
as are hereinafter more particularly described in the fol
Morris Sorkin, Bergen?eld, N.J., assignor to Champlain
Company, Inc., Bloom?eld, N.J., a corporation of New
lowing speci?cation. The speci?cation is accompanied
by drawings in which:
York
FIG. 1 is a side elevation drawn to small scale showing
Filed Oct. 23, 1957, Ser. No. 691,856
6 Claims. (Cl. 83—282)
apparatus utilizing the present invention;
10
This invention relates to intermittent web feed mecha
nisms, and more particularly to a photo-electrically timed
web clamp to improve the accuracy of such mechanism.
FIG. 2 is a fragmentary section explanatory of one form
of variable speed drive which may be used as a part of
the present invention;
FIG. 3 is a'diagram explanatory of the invention; and
There are many processes in which it is necessary to
FIG. 4 is a graph explanatory of a feature of the in
feed a web continuously at one place, and intermittently 15 vention'.
at another. A common example is the combination of a
Referring to the drawing, and more particularly to
rotary printing press with a reciprocating press which
FIGS. land 3, the entire line of machinery may be driven
scores, creases, punches or cuts a printed web‘. For brevity
by a main drive shaft 12, which extends lengthwise of the
the term “punch” is used hereinafter for all such opera
moving web 20. Shaft 12 may be driven in any desired
tions. The punch press works on an intermittently sta 20 fashion, as by means of a main driving motor 14 (FIG.
tionary web, which forms part of a web which is moving
3), operating through appropriate belts, chains or gearing
at constant velocity in the printing press. The problem
indicated at 16‘.
is to secure accurate registration of the print and the
The web 20‘ may be acted on by a series of multi
cut, combined with high speed operation.
color printing units, which may be of the gravure type.
Mechanism for intermittent feed through a punch press 25 The last two of a series of such units are here shown at
is disclosed in US. Patent No. 2,658,406 entitled “Vari
22 and 24 in FIG. 1. Each has a gravure cylinder 26
able Speed Feed Mechanism” granted November 10, 1953
(FIG. 3) driven by main shaft 12 through gearing indi
to John Gibson ‘McIlvain, Jr. A different mechanism for
cated at 28. The printing units may be conventional, and
the same purpose is disclosed in US. Patent No. 2,548,136
may include the usual driers at ‘23 and 27 (FIG. 1) to dry
entitled “Register Control Means for Continuous and In 30 vthe web between successive printing operations. Elab
termittent Web Feed Mechanism” granted April 10, 1951
orate mechanism, including electric eye scanners 30 (FIG.
to Frederick Auer.
1), may be provided between successive printing units to
These mechanisms cause acceleration to a speed sub
maintain the different colors in registration, and for this
stantially higher than the average web speed, and decelera
purpose, the gearing symbolized at 28 (FIG. 3) may in
tion down to Zero velocity or “dwell” of the web.
The 35 clude an appropriate running register, preferably of the
mechanism usually provides a period of uniform high
velocity between accleration and deceleration, in order to
help compensate for the dwell period without requiring
too high a maximum velocity.
It has proved difficult to obtain perfect cut—to-print
register. It has been found that backlash is a major factor
in causing cut-to-print variations, because of the inter
mittent drive, which repeatedly accelerates and decelerates.
planetary or differential gear type, which permits the auto
matic feed of a slight positive or negative motion from
correction motors to maintain registration. Scanning
mechanism for this purpose may be of the type shown 'in
my US. Patent 2,348,862 entitled “Register Control Ap
paratus,” issued on May 16, 1944.
Running register
mechanism is shown in US. Patent 2,163,035 entitled
“Apparatus for Eifecting Register of Multiple Operations”
The error caused by this factor tends to grow worse as
issued June 20, 1939 to William F. Grupe.
the parts of the mechanism become worn. It has already 45
The printed web is fed to a punch press 32 by means
been suggested to load the intermittent feed roller by
of an intermittent feed roller 34, cooperating as usual with
means of a brake, thus keeping the backlash in one
an idler 36. The press 32 is driven by main shaft 12
‘direction at all times. This is helpful, but is inet?cient
through appropriate ‘gearing at 38 and 40, connected at
because of the substantial waste of power and excessive
42, and serving to reciprocate the punch, as by means of
wear of the mechanism caused by the continuous applica
connecting rods 44 leading to eccentrics on punch press
tion of braking force. It has also been suggested to use
shaft ‘46. The intermittent feed roller 34 is also driven
a clamp or brake which is applied directly to a fast mov
from main shaft 12, as by means of gearing in box 48
ing web in order to stop the same, but such clamps have
and box 50, the latter including appropriate cam or like
not proved desirable because they may injure the web, and
mechanism to convert the vcontinuous uniform speed ro
55
in any event with the web moving at high velocity the de
tation of shaft 12 to an intermittent rotation of roller 34.
sired degree of accuracy is not obtained.
This mechanism may be of any suitable type, including
The prime object of the present invention is to general
for example the-Mcllvain drive shown in Patent 2,658,
ly improve intermittent feed mechanisms of the variable
406, or the Auer drive shown in Patent 2,548,136, pre
speed type. A more particular object is to change the
viously mentioned.
variable speed cycle of the web to provide a brief interval
The intermittent drive as heretofore designed would
of low uniform velocity just before the dwell period, and
produce a web movement of the character shown graph
ically in solid lines in FIG. 4 of the drawing. This graph
to combine the said modi?ed variable speed drive with
plots the web velocity as a function of angular rotation, for
a web clamp which positively stops the web at exactly the
desired instant during the aforesaid brief interval of low 65 one full cycle of the punch press. The average web speed
velocity movement. The variable speed drive may be
at the printing cylinder 26, where the speed is uniform,
is indicated by the horizontal broken line 52. The web
controlled mechanically in the usual way, but the clamp is
speed produced by the feed roller varies between a high
preferably independently controlled by electronic means
including a photo electric eye or scanner which responds
velocity shown at 54, and a dwell or zero ‘velocity shown
to the actual printing on the web, and preferably at a 70 at 56. The reciprocating punch operates on the web dur
point at or close to the punch press, thereby insuring ac
ing the dwell period at _56_.v
curacy of cut-to-print registry.
The deceleration of the web from maximum to zero
3,025,740
3
4
velocity is shown at 58. The acceleration of the web from
the cycle used in any particular intermittent feed mecha
different print length. There is lost motion in all such
gearing. The backlash in the intermittent drive mecha
nism 50 itself contributes to cut-to-print variation. Load
nism may differ, but in all cases, it is essential to have a
dwell or zero velocity period during which a reciprocating
might be helpful, but obviously is inefficient and wasteful
press may operate on the web, and it is necessary to
accelerate to a high velocity to make up for the dwell
of power, and hastens wear of the mechanism.
Referring now to FIG. 3, in accordance with my inven
period. It is necessary to decelerate in order to provide
tion the apparatus additionally includes a photoelectric
cell 170 controlled by the previous operation on the web,
zero to maximum velocity is shown at 60.
Of course,
the dwell period. The symmetrical curve 60, 54, 58, 56
shown in FIG. 4 is a simple and desirable way to achieve
the intended purpose, but it is not essential that the
ing the intermittent feed roller 34 by means of a brake
in this case the printing on the web. There is also cir
cuitry indicated at 75 associated with the photoelectric
cell 170 for precision web control by means of clamps.
For this purpose, there is a clamp 176 located adjacent
is it essential to have a period of uniform high velocity,
the punch press 32, and arranged to momentarily clamp
as shown at 54. The latter is desired in order to lessen the
needed maximum velocity to obtain the required average 15 the web in order to positively stop it. A companion clamp
178 may be provided ahead of feed roll 34. An additional
velocity 52. Also the graph is idealized in that the
deceleration and acceleration be at the same rate, nor
corners usually would not be sharp as here shown.
means, generally designated 80, together with circuitry 75,
Regardless of the particular nature of the intermittent
feed mechanism, it is evident that because of the alter
nating acceleration and deceleration, any backlash or play
controls the timing of the operation of the clamp means, in
order to maintain the punch press operation in registra
tion with the printing on the web.
For release of the clamp bars, appropriate means may
be provided, and in this case, I provide a microswitch 172
which is controlled by the position of an element, in this
in all of the parts of the mechanism will introduce some
uncertainty or inaccuracy in the feed. Many things have
been done in an effort to improve the cut-to-print registra
case a cam 174, which moves with the apparatus perform~
tion. For example, reverting to FIG. 3, the apparatus
includes a web pull unit using a pull roller 62 which is 25 ing the operation on the web, that is, with the punch press
driven from the main drive shaft 12 through a gear box
64. Pull roller 62 cooperates with an idler 66. A slack
32.
Referring now to FIG. 2, the variable feed mechanism
there shown is of the type disclosed in the aforesaid
loop of web is provided at 6% between the uniform velocity
McIlvain Patent 2,658,406 and it includes a cam 82. The
pull roller 62 and the intermittent feed roller 34. During
each cycle this loop grows, say to the dotted line position 30 shape of the cam as heretofore-designed produced accel
eration, uniform high velocity, deceleration, and dwell,
68’, during dwell at roller 34, and then the loop is taken
up and reduced to minim-um dimension. This latter posi
tion of the loop may be determined by a ?xed cylinder 70.
The gear ratio in the drive 48 leading to intermittent feed
roller 34 is preferably so selected that the web is momen 35
as shown in solid lines in FIG. 4, and as previously de
scribed. However, in the present case the shape of the
cam is modi?ed, particularly in the region 84, to produce
a brief interval of uniform low velocity immediately pre
tarily pulled tight once during each cycle. At that time,
ceeding the dwell period.
tension builds up between the intermittent ‘feed roller 34
This is illustrated by the graph shown in dotted lines
in FIG. 4 of the drawing. The modified graph is char
acterized by acceleration 86 and uniform high velocity
and the pull cylinder 62, as determined by the position of
the stop cylinder 70, and the web then slips at the inter
mittent feed roller 34. As the intermittent feed roller 34 40 88, much as before. These are followed by a deceleration
decelerates, and its peripheral speed approaches the speed
90, which however, is discontinued when a very low ve
of the web feeding out of the pull roller 62, the slipping
stops and the web coming out of the feed roller 34 is
controlled by that roller.
locity is reached, and the low velocity is maintained for
a brief interval, as is indicated at 92. Thereafter the
web is again decelerated, as shown at 94, the small amount
To correct or maintain the register, a compensator roller 45 needed to bring it to the zero velocity shown at 56. To
72 may be interposed between the last printing unit and
distinguish the momentary ?nal deceleration 94, from the
the pull roller 62. The vertical position of compensator
main deceleration 90, I shall refer to the part 94 as “stop
72 may be controlled by a correction motor 74, driving
page,” in which case my new cycle comprises acceleration,
vertical screws 76 which raise or lower the compensator
uniform high velocity, deceleration, uniform low velocity,
roller 72. This may be under control of a web scanner 50 stoppage, and dwell.
78 located near the pull roller 62, and cooperating with a
suitable phase detector mounted on or geared to the
main drive shaft 12. The phase detector may be of the
type described in my aforesaid Patent 2,348,862.
The pull roller 62 is normally so selected that its periph 55
eral speed very slightly exceeds that of the printing cylin~
der 26, and therefore the web is under tension therebe
tween. For perfect cut-to-print register, the position of
a target printed on the web should remain in a ?xed phase
The high velocity 88 is slightly greater than velocity
54 to compensate for the loss between deceleration 58
and 90. It will be understood that the interval 92 of
uniform low velocity is suitably located to straddle the
desired clamp instant for precise registration. Thus the
clamp 176 will stop the web during this low velocity
movement, and is able to positively stop the web ac
curately for the desired registration. The clamp is re
leased before renewed acceleration begins. The timing
relationship with the printing cylinders as the web passes 60 for release of the clamp can be taken from one of the
the pull roller 62. If a slack loop is brought to a stop,
shafts, most simply the punch press shaft 46. However,
as shown at 70, the print should be in ?xed phase relation
the timing for descent of the clamp is taken from a
ship to the printing press cylinder 26 at the instant that the
marker on the web cooperating with the web scanner
web stops slipping at the intermittent feed roller 34. All
170, which is preferably located as near as possible to
of this apparatus has been used before, and may be re 65 the press.
tained now along with my improvement, but is less im
Reverting to FIG. 2 and considering the variable speed
portant now and may be made to less accurate standards
drive in greater detail, the power input is at pinion 96,
now.
meshing with a gear 98, which revolves the pivot 100
For perfect cut-to-print register, it would also be neces
sary for the web to travel precisely the same distance 70 of a planet gear 102, meshing with a sun gear 104. In
during each cycle from that instant until it is stopped
asmuch as planet gear 102 turns only a fraction of a
under the die. The various gear boxes, such as 48 and
64 include change gears to accommodate changes in the
length of the sheet or print, so that it will not be necessary
revolution on the said pivot 109, the planet may be mu
tilated, leaving only a sector of a gear, as shown. The
to change the diameter of the rollers 34 and 62 for each
pivot 160.
sector 102 is affixed to an arm 106 oscillatable about
Arm 106 carries a cam follower roller 108
3,025,740
6
5
tration, but during actual operation the web'loop 68~does
not reach and actually hit the stop roll 70, and there
which is received in the cam groove 82 previously re
ferred to. The cam and its groove are stationary.
The output is applied by sun gear 104 to a shaft 110
which leads to a bevel gear 112 meshing with a bevel
pinion 114 which in turn drives a shaft 116 leading to
preferably is a slight slack, as is indicated on the drawing.
The clamp mechanism must accurately repeat its mo
tion once each punch cycle, and stop the web in minimum
time after the triggering impulse from the scanner, in
bevel gear 118 meshing with bevel gear 120. The lat
ter turns the feed roller 34 previously referred to.
order to minimize changes of cut-to-print register with
Reverting now to FIG. 3 of the drawing, the web
scanner 170 is preferably located just ahead of and as
close as feasible to the punch press 32. The clamp 176
also is preferably close to the punch press. It is not
necessary to have two clamp bars, but it is preferred to
employ the two bars 176, 178, one on each side of the
feed roll 34, in order to help maintain a more positive
15
control of the web».
The clamps 176, 178 are operated by hydraulic cylin
ders 126, 128, which are energized from a suitable
source 130 of hydraulic power. The hydraulic ?uid is
controlled by a solenoid operated valve shown at 80, and
20
the latter is controlled by circuitry housed at 75.
The circuitry is not illustrated in detail, and may as
sume a variety of forms. Essentially the passage of
‘a mark on the web beneath the eye 170 may be used
through conventional circuitry to trip the operation of the
clamp, and for appropriate corrective adjustment one 25
changing speed. For example, if the web is travelling at
1200 feet per minute or 240 inches per second at full
web speed, it will travel 0.240 inch per millisecond. With
my modi?ed intermittent motion shown in the graph
(FIG. 4) at 1/10 speed the web will travel ‘0.024 inch; at
1/20 speed 0.012 inch; and at V30 speed 0.008 inch. The
following table relates the clamping time and speed ratio
to web travel per millisecond at various web speeds from
6100 ft./min. to 1200 ft./min.
Table I
600
Web Speed in Fit/Min.
800
1000
1200
Web Travel in inches per
Milliseeond
Speed Ratio, Mo ................... __
.012
.016
. 020
.024
Speed Ratio, V20 .... -_
Speed Ratio, l/éu ___________________ _-
.006
.004
.008
.0053
.010
.0067
.012
.008
may shift the location of the mark on the web, or shift
the location of the scanner 170 longitudinally of the web,
or vary the time delay between the scanner impulse and
the actual clamp action.
Considerably improved cut-to-print register is possible
From this table it is possible to pick a suitable set of
values for the maximum time of operation of the clamp
30
ing mechanism, and permissible variation in the clamping
time, for any desired accuracy of cut-to-print register.
using my new method. It may be said that in this method
The illustrated mechanism consisting of an electro
the frame of the punch is itself used as a reference for
hydraulic valve controlling a hydraulic cylinder which
the proper location of the print.
actuates the clamping linkage, can achieve the rapid action
The web scanner 170 is located on the punch infeed
required. If the distance the clamping bars travel is
35
in position to view the register mark on the web just as
0.020 inch, and if oil at 700 lbs. per sq. inch pressure is
it approaches its correct position with respect to the die
available at a rate of 2.4 gallons per min., feeding a
in the punch. At that time it triggers the clamping mecha
hydraulic cylinder with 1/2 sq. in. plunger area, the clamp
nism, which stops the web by applying a force between
ing action takes place in approximately 3 milliseconds.
clamping bars 176, 178 and the ?xed structure support
Allowing for web thickness variation of 0.002 inch the
40
ing the web directly beneath the bars. In my system,
clamping time may vary 0.3 milliseconds. The clamping
the intermittent web motion is so modi?ed that the web
force per bar is approximately 150 lbs. From Table I,
is travelling at low speed (approximately 1/10 to 1/30 of
at 1200 ft./min. and 1/20 speed, register variation would
average web speed) when the clamp is applied to the
be 0.0036 inch. Position change from crawl speed to
web. Thus, any error in cut-to-print register caused by
1200 ft./min. would be 0.036 inch.
variations in the clamping time and clamping conditions 45
It is believed that the construction and operation as
is proportionately reduced.
By using two clamps, one before and one after the
intermittent feed roller, the web is held absolutely sta
well as the advantages of my improved intermittent web
feed mechanism will be apparent from the foregoing de
tailed description. The rough or approximate control
of the web is obtained by means of a variable speed feed
tionary at the time the die comes in contact with the
web, so that the intermittent drive during this time is 50 mechanism. This is so designed as to introduce a brief
interval of very low velocity movement of the web ahead
prevented from moving the web. The slow speed section
of the more usual dwell period. During the low ve
of the intermittent drive cycle is designed to provide at
locity travel an additional positive clamp means is accu
least 1A" of web travel, so that variations in the infeed
rately triggered to positively stop the web. Its control
mechanism fall within this slow speed travel section.
Thus the accuracy of cut-to-print depends only upon the 55 is e?icient and accurate because of the slow speed of
the web at the time it is clamped. The timing of the
reliability of the web scanner triggering the clamp, and
clamp is independently controlled by electronic circuitry,
the accuracy of repetition of the clamping motion.
including a web scanner which is responsive to the actual
The release of the clamps may be timed quite roughly,
printing on the web, and thus the web may be positively
compared to their clamping action. The reason is that
once the die reaches the Web, the web is held by the die 60 stopped in proper position for accurate registry of cut-to
print.
vitself, until the die rises and releases the web. The
It will be apparent that while I have shown and de
clamps may be released any time after the die engages
scribed my invention in a preferred form, changes may
the web, and before acceleration begins. For this pur
be made in the structure shown without departing from
pose, I provide a cam 174 on the press shaft 46, operating
a microswitch 172 connected to the circuitry in box 75. 65 the scope of the invention as sought to be defined in
the following claims. In the claims the term stoppage is
This changes the valve solenoid at 80, and so raises the
used for the part 94 of the cycle shown in FIG. 4, as
clamps 176, 178.
above de?ned.
Other methods may be used, for example, an adjust
I claim:
able time interval. However, it is better to relate the 70
1. Apparatus for feeding a moving web through web
release to the punch press position, thus making it in
treating apparatus which operates on the web when sta
dependent of shaft and web speed, including starting up,
and slowing to a stop.
-
In FIG. 3 the stop roll 70 is still present, and func
tionary and for causing said operation to be in proper
registration with a previous operation on the web, said
apparatus comprising an intermittent web feed mecha
tions usefully during rough setting up of preliminary regis 75 nism to move the web through the apparatus intermit
3,025,740
7
8
tently, said intermittent web feed mechanism comprising
nism to move the web through the apparatus intermit
a feed roll, a drive shaft which rotates at uniform ve
tently, said intermittent web feed mechanism comprising
locity and which is connected to and which thereby ro
a feed roll, a drive shaft which rotates at uniform velocity
tates in synchronism with the web treating apparatus,
and which is connected to and which thereby rotates
mechanism between said drive shaft and said feed roll to
rotate the latter intermittently, said mechanism including
a cam driven by said drive shaft and associated parts
driven by said cam to cause rotation of the feed roll in
in synchronism with the Web treating apparatus, mecha
a variable speed cycle, the shape of said cam being such
that the cycle produced by rotation of the cam includes
acceleration, deceleration, uniform low velocity, stoppage
nism between said drive shaft and said feed roll to rotate
the latter intermittently, said mechanism including a cam
driven by said drive shaft and associated parts driven by
said cam to cause rotation of the feed roll in a variable
speed cycle, the shape of said cam being such that the
cycle produced by rotation of the cam includes accelera
and dwell, a triggering means controlled by the previous
tion, uniform high velocity, deceleration, uniform low
operation on the web, clamp means adjacent the apparatus
velocity, stoppage and dwell, a triggering means con
and adapted to momentarily clamp the web during its
trolled by the previous operation on the Web, clamp
aforesaid uniform low velocity movement in order to 15 means adjacent the apparatus and adapted to momen
positively stop it, and means whereby said triggering
tarily clamp the web during its aforesaid uniform low
means controls the timing of the operation of said clamp
velocity movement in order to positively stop it, and
means in order to maintain the apparatus operation in
means whereby said triggering means controls the timing
registration with the previous operation on the web.
of the operation of said clamp means in order to main
2. Apparatus for feeding a moving printed web 20 tain the apparatus operation in registration with the pre
through a punch press which operates on the web when
stationary and for causing said operation to be in proper
registration with the printing on the web, said apparatus
vious operation on the web.
5. Apparatus for feeding a moving web of paper or
like light weight material which is received at uniform
high speed, through web treating apparatus which oper
the web through the punch press intermittently, said in 25 ates on the web when stationary and for causing said
comprising an intermittent web feed mechanism to move
termittent web feed mechanism comprising a feed roll, a
drive shaft which rotates at uniform velocity and which
operation to be in proper registration with a previous
operation on the web, said apparatus comprising an inter
mittent web feed mechanism to move the web through
is connected to and thereby rotates in synchronism with
the punch press, mechanism between said drive shaft and
the apparatus intermittently in uniform increments, said
said feed roll to rotate the latter intermittently, said 30 intermittent web feed mechanism comprising a feed roll,
mechanism including a cam driven by said drive shaft
a drive shaft which rotates at uniform velocity and which
and associated parts driven by said cam to cause rotation
is connected to and which thereby rotates in synchronism
of the feed roll in a variable speed cycle, the shape of said
with the web treating apparatus, mechanism between said
cam being such that the cycle produced by rotation of the
drive shaft and said feed roll to rotate the latter inter
cam includes acceleration, deceleration, uniform low ve 35 mittently, said mechanism including a cam driven by said
locity, stoppage and dwell, a photoelectric cell controlled
drive shaft and associated parts driven by said cam to
by the printing on the web, circuitry associated with said
cause rotation of the ‘feed roll in a variable speed cycle,
photoelectric cell, clamp means adjacent the punch press
said cam being driven by said drive shaft at a speed of
and adapted to momentarily clamp the web during its
the order of hundreds of revolutions per minute, the
low velocity movement in order to positively stop it, 40 shape of said cam being such that the cycle produced
means whereby said circuitry controls the timing of the
by rotation of the cam includes acceleration, uniform
operation of said clamp means in order to maintain the
punch press operation in registration with the printing on
the web, and means to release the clamp means.
3. Apparatus for feeding a moving printed web through
high velocity, deceleration, uniform low velocity, stop
page and dwell, the period of uniform low Velocity being
very brief compared to the length of the cycle, a trigger~
ing means controlled-by the previous operation on the
a punch press which operates on the web when stationary 45 web, clamp means adjacent the apparatus and adapted
and for causing said operation to be in proper regis
tration with the printing on the web, said apparatus
comprising a uniform velocity drive shaft to drive the
punch press, an intermittent web feed mechanism driven
by said shaft to move the web through the punch press
intermittently, said intermittent web feed mechanism
comprising a feed roll, mechanism between said drive
shaft and said feed roll to rotate the latter intermittently,
said mechanism including a cam driven by said drive shaft
to momentarily clamp the web during its aforesaid uni
form low velocity movement in order to positively stop
of the feed roll in a variable speed cycle, the shape of
operation to be in proper registration with the printing
it, and means whereby said triggering means controls the
timing of the operation of said clamp means in order
to maintain the apparatus operation in registration with
the previous operation on the web.
6. Apparatus for feeding a moving printed web of
paper or like light weight material which is received at
uniform high speed, through a punch press which oper
and associated parts driven by said cam to cause rotation 55 ates on the web when stationary and for causing said
said cam being such that the cycle produced by rotation
of the cam includes acceleration, uniform high velocity,
deceleration, uniform low velocity, stoppage and dwell,
on the web, said apparatus comprising a uniform velocity
drive shaft to drive the punch press, and intermittent
web feed mechanism driven by said shaft to move the
60
a photoelectric cell controlled by the printing on the web,
web through the punch press intermittently in uniform
circuitry associated with said photoelectric cell, clamp
increments, said intermittent Web feed mechanism com
means adjacent the punch press and adapted to momen
prising a feed roll, mechanism between said drive shaft
tarily clamp the web during its low velocity movement
and said feed roll to rotate the latter intermittently, said
in order to positively stop it, means whereby said cir 65 mechanism including a cam driven by said drive shaft
cuitry controls the timing of the operation of said clamp
and associated parts driven by said cam to cause rotation
means in order to maintain the punch press operation in
of the feed roll in a variable speed cycle, said cam being
registration with the printing on the web, and means
driven by said drive shaft at a speed of the order of hun
driven by said shaft to time the release of the clamp
dreds of revolutions per minute, the shape of said cam
means.
70 being such that the cycle produced by rotation of the
4. Apparatus for feeding a moving Web through web
cam includes acceleration, uniform high velocity, de
treating apparatus which operates on the web when sta
celeration, uniform low velocity, stoppage and dwell,
the period of uniform low velocity being very brief com
tionary and for causing said operation to be in proper
pared to the length of the cycle, a photoelectric cell con
registration with a previous operation on the web, said
‘apparatus comprising an intermittent web feed mecha 75 trolled by the printing on the web, circuitry associated
3,025,740
10
9
with said photoelectric cell, clamp means adjacent the
punch press and adapted to momentarily clamp the web
during its low velocity movement in order to positively
stop it, means whereby said circuitry controls the timing
of the operation of said clamp means in order to main
tain the punch press operation in registration with the
printing on ‘the web, and means driven by said shaft to
time the release of the clamp means.
References Cited in the ?le of this patent
10
UNITED STATES PATENTS
1,435,979
Reed ______________ __ Nov. 21, 1922
1,951,844
2,163,035
2,269,328
2,348,862
2,548,136
2,581,937
2,658,406
2,676,799
2,83 8,113
2,898,995
Rose ______________ __ Mar. 20,
Grupe ______________ __ Iune 20,
Williamson ____________ __ Jan. 6,
Sorkin _____________ __ May 16,
Auer _______________ __ Apr. 10,
Secrest ______________ __ Jan. 8,
McIlvain
__________ __
Nov.
10,
Fletcher ____________ __ Apr. 27,
Cornell ____________ __ June 10,
Funnell ____________ _._ Aug. 11,
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