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Патент USA US3035824

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May 22, 1962
F. w. MOSEY ETAL
3,035,814
APPARATUS FOR TENSIONING FLEXIBLE BINDING
MATERIAL AROUND PACKAGES AND THE LIKE
Filed April 29, 1959v
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May 22, 1962
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F. w. MOSEY ETAL
3,035,814
APPARATUS FOR TENSIONING FLEXIBLE BINDING
MATERIAL AROUND PACKAGES AND THE LIKE
Filed April 29, 1959
5 Sheets-Sheet 2
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May 22, 1962
_
F. W. MOSEY ETAL
3,035,814
APPARATUS FOR TENSIONING FLEXIBLE BINDING
MATERIAL AROUND PACKAGES AND THE LIKE
Filed April 29, 1959
5 Sheets-Sheet 3
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May 22, 1962
F. w. M OSEY
APPARATUS FOR
MATERIAL ARO
Filed April 29, 1959
ETAL
3,035,814
SIONING F E IBLE BINDING
PACKAGES
D THE LI KE
5 Sheets-Sheet 5
United States Patent
iC€
1
2
eration and before starting another. Such unidirectional
3,035,814
rotation of the cam also enables its sectors to be con
APPARATUS FOR TENSIONING FLEXIBLE BIND
ING MATERIAL AROUND PACKAGES AND THE
LIKE
Frederick William Mosey, Oswald Victor Langford, and
toured unsymmetrically, so that each sector gives rise
to a quick return of the gripper followed by a relatively
gradual tensioning stroke thereof.
The accompanying drawings show by way of example
Jack Wild, London, England, assignors to Seal-Less
Strapping Limited, London, England, a corporation of
a tool for banding packages or the like with metal strip
in which the latter is tensioned in accordance with the
invention.
Great Britain
Filed Apr. 29, 1959, Ser. No. 809,761
Claims priority, application Great Britain May 9, 1958
7 Claims. (Cl. 254-51)
l0
In these ‘drawings:
FIGURE 1 is a vfront elevational view of a mechanism
This invention relates to a mechanism for tensioning
?exible material after the material has been looped for
constructed in accordance with this invention;
FIG. 2 is a corresponding view partly in section, with
the front cover plate and pneumatic motor power device
example around a package and before the overlapping
portions of the material are interconnected. This mech
3,035,314
Patented May 22, 1962
15
removed;
anism is of the type essentially comprising two grippers.
FIG. 3 is a rear elevational View again omitting the
The ?rst gripper is reciprocally movable towards and away
pneumatic motor, but indicating the limits of movement
from the second gripper for successively applying a ten
of the levers for operating the anchoring gripper and the
sion to the material; the second gripper being adapted to
joining mechanism;
hold the tension after it has thus been applied by the 29
FIG. 4 is an end elevation from the left of FIGURE 1;
?rst gripper. The ?rst gripper is adapted to open during
‘FIGURE 5 is a sectional view taken substantially along
its return stroke to take a fresh hold on the material and
the line 5—5 of FIG. 1;
the second gripper is adapted to open to permit passage
FIG. 6 is a detail front elevational view to show the
of the material through it during the tensioning strokes
loading positions of the tensioning and holding grippers;
of the ?rst gripper. In mechanisms of this type a free 25 and
end of the material may be held by means of an anchor
ing gripper or otherwise, as for example by being hooked
‘FIG. 7 is a similar detail view to show the normal range
of movement of the tensioning gripper under the in?uence
to a seal. Moreover, the tensioning strokes of the ?rst
of the pneumatic motor.
gripper may be used either to pull or to push the material
In the tool thus illustrated, the joint ‘formation between
through the second gripper and similarly either to pull or 30 the overlapping lengths or portions S1 and S2 of the pre
to push the material through an associated jointing or
viously looped strip material is effected in a manner in
sealing device with both the grippers disposed either on
accordance with the teachings of United States Patent No.
the far or on the near side of the latter, or with one of
2,549,626. For this purpose the tool comprises a base
the grippers on one side and one on the other.
plate 1 with a gripper 2 for anchoring an end of under
The required reciprocation of the ?rst gripper may be 35 lying strip portion S1. Strip portions S1 and S2 extend
effected by the swinging of a pivoted lever on which said
gripper is mounted, a tensioning means of this character
to which the present invention can be advantageously ap
plied being one in which both grippers are on the far
in overlapping manner over the lower jointing dies 3
bedded in said plate. Overlapping strip portion S2 thence
extends to the left in FIG. 2 above the anvil 4 to the
tensioning means, to be hereinafter ‘described, and then
side of a jointing device with the ?rst gripper arranged 40 preferably beyond that to a supply coil.
outwardly of the second gripper so that it is adapted to
The joining of the overlapping strip portions is e?ected
tension the material by pulling it through both the second
by the coaction of upper dies 5 and 6 with the dies 3.
gripper and said device.
The upper dies are successively moved toward lower dies
In accordance with the present invention the recipro
3 into contact with the overlapping lengths of strip. Die
45
cation of the ?rst gripper is e?ected by successive power
5 is moved su?iciently at least to hold these lengths be
thrusts imparted thereto. These thrusts are preferably
fore the upper strip part S2 is severed by the blade 7 on
‘delivered all in one direction only, against the reaction
die 6 against the anvil during the subsequent movement
of a spring or the like, so that the consequent positive
of die 6 into engagement with said lengths intermediate
strokes of said gripper in this direction leave it free for
the severed end of strip portion S2 and die 5.
intermediate or return strokes in the opposite direction
Such lowering of the dies, in sequence, is effective ‘by
under the in?uence of said spring. The gripper is prefer
the pair of lever handles 8 and 9 which are adapted to be
ably thrust positively in the direction for tensioning with
simultaneously swung oppositely on their respective jour
a ‘force which is limited according to the magnitude of
nals 8a and 9a vfrom the position shown in solid lines
?nal tension desired in the material. The power may be
to the joining or operative position shown in broken lines
conveniently applied to the aforementioned lever which
in FIG. 3. Handles 8 and 9 are intercoupled by gearing
carries said gripper.
between their hubs 8b and 9b at the rear of the tool as
Successive thrusts on the gripper of an appropriate kind
shown in FIG. 3 and their operative or joining stroke is
adjustably limited by abutment of the stop 8c on the hub
can be produced by means of a cam of star form, prefer
8b against the hub 9b. The dies 5 and 6 are actuated
ably rotatable by a motor which is self-stopping in face
respectively by the consequent rotation of the journals
of the resistance opposed by the full tension required. A
8a, ‘9a through the eccentrics 5a, 6a thereon and the
pneumatic motor which is capable of remaining in op
pivotal ‘links 512, 6b as illustrated in FIG. 2. Die 5 is also
eration until this predetermined upper power limit is
used to control a catch 10 for preventing lateral displace
reached simply by being kept in communication with a
ment of the strip part S2 until the overlapping strip parts
source of compressed air, is especially suitable for the
are gripped by that die. Catch 10 has a portion extend
purpose. Moreover the maximum power thus applied
ing
into a slot 50 of die 5 whereby the catch is freely
can be readily controlled by means of a pressure regulator
lowered into operative position when die 5 is raised
in the air supply to the motor. A single-acting motor of
(see FIG. 2) and the catch lifted clear of said strip part
this kind is adapted to rotate said cam unidirectionally,
during the ?nal stage of the descent of die 5. Anchor
without requiring any reversal of the cam as a con 70 ing gripper 2 is controlled by and can be freely closed
sequence of or following release of the air pressure act
onto strip part S1 by its lever handle 2a when dies 5 and
ing on said motor on conclusion of one tensioning op
6' are raised. However, this gripper is thrown open by
3,035,814.
the engagement of its operating handle by jointing lever
9 during the ?nal part of the operative stroke of the
latter (see FIG. 3).
Turning now to the means for tensioning the strip part
S2 with which the present invention is more immediately
concerned, this consists of the combination of a tension
6.
moved inwardly (to the left) against the resistance of
spring 1312 resulting in movement of gripping jaws 11c
and 11a.’ to the left in the tensioning direction.
The thrust of the cam is therefore delivered to the grip
per outwardly to produce the tensioning strokes thereof,
whilst the return strokes are caused by the spring. This
arrangement also has the advantage that it does not inter
fere with the ?nal simultaneous opening of the grippers in
the manner already described, for lever 1117 may be easily
mounted on pin 11a which is spaced outwardly in the
tensioning ‘direction (to the left in FIG. 2) from movable 10 pivoted to lift the follower from the cam against the re
sistance of spring 13b. Because of its high speed of rota
dies 5 and 6. Holding gripper 12 is pivotally mounted on
tion, the cam 13 is preferably shielded by a safety
pin 12a which is disposed intermediate pivot pin Ma and
guard 17.
the movable dies.
The cam is here rotatable unidirectionally anticlock
Gripper 11 consists of a lever 11b pivotally mounted on
pin 110, a lower jaw part 11c integral with lever 11b and 15 wise (as seen in FIGS. 2 and 7) so that its three sectors
can be similarly contoured unsymmetrically to give a
an associated upper jaw member 11d which is movable
quick return stroke of gripper 11 under the in?uence of
relative to lever 11b and lower jaw 110 about pivot pin
spring 13b when the follower drops behind one of the
11a. Upper jaw member lid is urged toward its closed
sharp corners 130 of the cam, tending to snap the grip
position for engagement with the strip material by a com
per open, and a relatively gradual tensioning stroke as the
pression spring 11e acting between said ja-W member and
follower rides up the slope 13d to the next corner.
lever 11b. As will be described, gripper 11 may be
ing gripper, generally denoted 11, and a holding gripper,
generally denoted 12. Tensioning gripper 11 is pivotally
opened manually when required by the extension piece
11]‘.
Gripper 12 consists of an upper movable jaw member
1212 on the pivot 12a associated with anvil 4 which in this
case is ?xed and acts as a lower jaw. Movable jaw mem
ber 12b is urged by compression spring 120 towards the
closed position for engagement with the strip material.
As may be seen spring 120 acts between jaw member 12b
and an adjacent part of the tool body. The two upper
jaw members 11d and 12b are thus so constructed that
As shown in FIG. 5 cam 13 has a stub shaft 13s by
which it is mounted in the back plate 14 of the tool in
a bearing 1%, and is rotated unidirectionally in the re
quired manner by a pneumatic motor 15 which may be
of the ?n turbine type commonly known as a nutsetter.
This motor extends longitudinally above the body of the
tool supported by suitable strap parts 15a and 15b from
the tool front plate 16 (see FIG. 1), with its transmis
sion head 15c adjacent the cam and its output spindle 15d
squared and rearwardly directed ‘from said head for en
gagement in a corresponding socket 13f of the cam, as
the operative parts of both members beneath the respec
shown in‘ FIG. 5.
tive pivot 11a and 1242 open in the direction of tension
The speed contemplated for the motor 15 is up to ap
ing, i.e. to the left in FIGS. 1, 2, 6 and 7.
The lever 11b of the tensioning gripper is adapted to 35 proximately 15,000 revolutions per minute in the turbine.
With appropriate gearing a suitable output rate for the
be swung so that the lower jaw 11c thereon moves out
cam of between about 90 to about 350 rotations per min
ute may be obtained. The maximum power which the
'7), with the associated upper jaw 11d closed onto the
motor can exert and thus the maximum tension which
strip to hold it. As lever 11b returns inwardly (to the
right) the lifting of upper jaw lid in the same direction 40 can be applied by the machine to the strip material is de
pendent upon the pressure of its air supply. This power
is eifected against spring He by the engaged strip then
can, however, be adjustably controlled below its upper
held stationary by gripper 12. The limits of this lever
limit to apply a lesser tension by means of a simple regu
movement are shown in FIG. 7. The corresponding ac
vlator 15e (see FIG. 1), whereby the cross section of the
tuation of gripper 12 is similarly automatic, its upper jaw
supply line is restricted. This has the effect of diminish
member 1212 being lifted by the strip as it is drawn through
ing the air ?ow and of thereby reducing the rotation rate
by the successive tensioning strokes of gripper 11 and
of the motor and consequently delaying the build-up of its
closed by spring 120 during the return strokes of that
torque over the short period during which the motor is
gripper, so that each gripper is opened by the strip in
required to remain in operation for tensioning, so that
turn whilst the other is closed by its compression spring.
On conclusion of jointing, both grippers may however 50 when stalling of the motor ‘begins. to take place and the
predetermined tension has been applied to the material
be opened simultaneously for strip removal and loading,
the operation can be terminated. In this connection it
by positively throwing over all their movable parts to
Wlll be understood that the actual duration of the oper
gether in the same direction as in tensioning, by means
ation of the motor is controlled by its lever 15]‘ which
of the handle extension 11]‘. Manual pressure on this
serves to open and close the air supply thereto fully.
handle being applied above pivot 11:: ?rst directly causes
We claim:
lifting of the jaw member 11d followed, when spring He
wardly (to the left) during tensioning (see FIGS. 6 and
has been fully compressed, by inward swinging of lever
11b beyond the normal limit of its tensioning stroke so
that the upper part of said lever abuts against stop 1201
on the jaw member 1% of the holding gripper above the
pivot 12a. This abutment with stop 12d causes jaw mem
1. An apparatus for tensioning ?exible strip material
which has been previously looped about a package or the
like to provide two adjacent portions of said strip mate
rial comprising the'ends of said loop, said apparatus
comprising means for engaging and holding one of said
portions of the strip material, a lever reciprocably mov
position against the resistance of compression spring 120,
able with respect to said holding means, a gripping ele
as shown in FIG. 6.
ment mounted on said lever effective to grip the second
The powering of lever 11b in accordance with the pres 65 portion of said strip material. to ‘apply a tension to said
ent invention is effected by means of a multi-throw star
looped material between said ?rst and second portions
cam 13 which is adapted to engage roller follower 13a
thereof when said lever is moving in one direction and
disposed on the upper extremity of lever 11b above pivot
effective to release said material when said lever is mov
ber 12b to pivot in a clockwise direction toward its open
11a.
Rotation of this cam in a counterclockwise direc
ing in the opposite direction, gripping means for grip
tion produces a succession of swings of lever 11b of su?i 70
ping said second portion of said material during move
cient amplitude to produce the normal tensioning and re
ment of said lever in said opposite direction, spring means
turn strokes of gripper 11 as previously described. Fol
urging said lever in said opposite direction, a rotatable
lower 13a is held in engagement with the cam by means
star-shaped cam engaging a portion of said lever, and
of a'tension spring 13b pulling on the upper part of lever
power means for rotating said cam to cause periodic
11b. The follower and upper end of lever 11b are thus
3,035,814
6
movement of said lever in said one direction against the
resistance of said spring means.
2. The structure of claim 1 wherein said power means
is self-stopping upon the application of a predetermined
amount of tension to said strip material by said lever and
tion carried on said lever to grip the second portion of
said strip material to apply a tension to said looped ma
terial between said ?rst and second portions thereof when
said lever is moving in one direction and e?ective to re
lease said material when said lever is moving in the op
said gripping element.
posite direction, gripping means pivotally mounted ad
jacent said lever for gripping the second portion of the
material during movement of said lever in said opposite
direction, said gripping element having a handle portion
and a lever engaging portion, said gripping element may
3. The structure of claim 2 wherein said power means
is a pneumatic motor operable to apply a predetermined
force to said cam, whereby a predetermined tension may
be applied to said strip material.
4. The structure of claim 2 wherein said power means
includes a source of compressed air and a pneumatic
motor in communication with said compressed air source
be moved in said one direction to release the second por
tion of the strip material from between ?rst and second
jaw portions and said lever may be moved in said one
direction into engagement with said gripping means to
to apply a force of predetermined magnitude to said
cam, whereby a predetermined tension may be applied to 15 pivot said gripping means, whereby the second portion
said material.
of material may be released by said gripping means,
5. The structure of claim 2 wherein said power means
means urging said lever in said opposite direction, and
includes a source of compressed ‘air, a pneumatic motor
power actuated means operatively engaging said lever
in communication with said compressed air source for
to move said lever in said one direction short of engage
applying a rotative force to said cam, and pressure-regu 20 ment with said gripping means for applying tension to
lating means intermediate said compressed air source
said material.
and said motor for regulating the air supply to the motor,
10. The structure of claim 9 in which said power
whereby the amount of force applied to said cam and
actuated means is e?'ective to apply successive power
the amount of tension applied to said strip material may
strokes to said gripping means to effect the application
be regulated.
25 of tension to said material in increments, and adjustable
6. The mechanism constructed in accordance with
means is provided for adjustably regulating the force ap
claim 5 wherein said motor delivers a unidirectional
plied to said lever by said power actuated means, whereby
force to said cam to effect rotation of said cam in one
the amount of tensioning in the strip material may be
direction only.
7. The structure of claim 6 wherein the radially pro
regulated.
11. An apparatus for tensioning ?exible strip ma
terial which has been previously looped about a package
or the like to provide two adjacent portions of said strip
material comprising the ends of said loop, said apparatus
ment.
comprising means for engaging and holding one of said
8. An apparatus for tensioning ?exible strip material 35 portions of the strip material, a gripping element mounted
which has been previously looped about a package or
for reciprocable movement with respect to said holding
the like to provide two adjacent portions of said strip
means and effective to grip the second portion of said
material comprising the ends of said loop, said appa
strip material to apply a tension to said looped material
ratus comprising means for engaging and holding one of
between said ?rst and second portions thereof when mov
said portions of the strip material, a lever pivotally and 40 ing in one direction and eifective to release said material
reciprocably movable with respect to said holding means
when moving in the opposite direction, gripping means
about a ?xed axis and having a ?rst jaw portion, a grip
for gripping said second portion of said material dur
ping element mounted for pivotal movement with re
ing movement of said gripping element in said opposite
Spect to said lever and said holding means about the
direction, means urging said gripping element in said op
pivotal axis of said lever, said gripping element having a
second jaw portion effective to cooperate with the ?rst 45 posite direction, a rotatable star-shaped cam engaging a
portion of said gripping element, and power means for
jaw portion carried by said lever to grip the second por
rotating said cam to cause periodic movement of said
tion of said material and to apply a tension to said looped
gripping element in said one direction.
material between said ?rst and second portions thereof
12. The structure of claim 11 wherein said power
when said lever is moving in one direction and e?ective
to release said material when said lever is moving in the 50 means includes a source of compressed air, a pneumatic
motor in communication with said compressed air source
opposite direction, gripping means adjacent said lever
for applying a unidirectional rotative force to said cam,
for gripping said second portion of said material during
and pressure-regulating means intermediate said com
movement of said lever in said opposite direction, manu
pressed air source and said motor for regulating the air
ally operative means for effecting release of the second
portion of the strip material by said lever and for effecting 55 supply to the motor, whereby the amount of force ap
plied to said cam and the amount of tension applied to
movement of said lever in said one direction into engage
said strip material may be regulated.
ment with said gripping means to release the second por
13. The structure of claim 11 wherein the radially
tion of the strip material therefrom, means urging said
protruding sectors of said star-shaped cam are of unsym
lever in said opposite direction and power actuated means
operatively engaging said lever to repetitively move said 60 metrical contour for effecting a gradual tensioning stroke
followed by a quick return of the gripping element.
lever in said one direction short of engagement with
14. An apparatus for tensioning ?exible strip material
said gripping means for applying tension to said ma
which has been previously looped about a package or the
terial.
like ‘to provide two adjacent portions of said strip mate
9. An apparatus for tensioning ?exible strip material
which has been previously looped about a package or the 65 rial comprising the ends of said loop, said apparatus com
prising means for engaging and holding one of said por
like to provide two adjacent portions of said strip ma
truding sectors of said star-shaped cam are of unsym
30
metrical contour for e?ecting a gradual tensioning stroke
followed by a quick return of the lever and gripping ele
terial comprising the ends of said loop, said apparatus
tions of the strip material, ?rst gripping means recipro
cably movable with respect to said holding means, said
comprising means for engaging and holding one of sa1d
?rst gripping means when moving in one direction being
portions of the strip material, .a lever pivotally and re
ciprocably movable with respect to said holding means 70 eifective to grip the second portion of said strip mate
rial -to apply a tension to said looped material between
about a ?xed axis and carrying a ?rst jaw portion adjacent
said ?rst and second portions, and when moving in the
one end thereof, a gripping element mounted for pivotal
opposite direction being effective to release said material,
movement with respect to said lever and to said holding
second gripping means for gripping said second portion
means about the pivotal axis of said lever and carrying
a second jaw portion cooperating with said ?rst jaw por 75 of said strip material during movement of said ?rst grip
3,035,314
8
7
direction by said motor driven means and then returned
in the opposite direction by said return means.
ping means in the opposite direction, motor drive means
which when energized has a continuous power output,
v'17. An apparatus for tensioning ?exible strip mate
rial which has been previously looped about a package
and means intermediate said motor drive means and said
?rst gripping means for applying the power from said
motor drive means to said ?rst gripping means in suc
' or the like to provide two adjacent portions of said strip
cessive and discrete thrusts, whereby‘ said ?rst gripping
means may be reciprocated until the desired tension is
produced in the looped strip material.
material comprising the ends of said loop, said apparatus
comprising means for engaging and holding one of said
portions of the strip material, a lever reciprocably mov
able with respect to said holding means, a gripping ele
15. The structure of claim 14 including means for ad
justably regulating the continuous power output of said 10 ment mounted on said lever eitective ‘to grip the second
motor drive means.
portion of said strip material to apply a tension to said
16. An apparatus for tensioning ?exible strip material
which has been previously looped about a package or
the like to provide two adjacent portions of said strip
material comprising the ends of said loop, said appara
thereof when said lever is. moving in one direction and
effective to release said material when said lever is mov
tus comprising means for engaging and holding one of
looped material between said ?rst and second portions
ing in ‘the opposite direction, gripping means for gripping
said second portion of said material during movement
of saidlever in said opposite-direction, spring means urg
said portions of the strip material, ?rst gripping means
ing said lever in said opposite direction, motor drive
reciprocably movable with respect to said holding means,
means having a continuous power output when energized,
said ?rst gripping means when moving in one direction
and means intermediate said motor drive means and said
being e?ectve to grip the second portion of said strip
lever for applying the power from said motor drive
material to apply a tension to said looped material be
means to said lever in successive and discrete thrusts,
tween said ?rst and second portions, and when moving
whereby said lever and the gripping element thereon will
in the opposite direction being effective to release said
be repetitively ?rst driven in said one direction by said
material, second gripping, means for gripping said second’
porton of said strip material during movement of said‘ 25 motor driven means and then returned in the opposite
direction by said spring means.
?rst gripping means in the opposite direction, return
means urging movement of said ?rst gripping, means
in said opposite direction of reciprocation, motor drive
means which when energized has a continuous power
output, and means intermediate said motor drive means 30
and said ?rst gripping means for applying the power
from said motor drive means to said ?rst gripping means
in successive and discrete thrusts, whereby said ?rst grip
ping means will be repetitively ?rst driven in said one
References Cited in the ?le of. this patent
UNITED STATES PATENTS
1,988,730‘
2,229,786
Harvey ______________ __ Jan. 22, 1935
Abbott ______________ __ Jan. 28, 1941
2,375,769
2,881,636
Childress et a1 _________ __ May 15, 1945
Palrnleaf ____________ __ Apr. 14, 1959
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