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Патент USA US2135920

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HJ. T_APLIN
2,135,920
STRAPPING MACHINE
Filed D80. 14, 1936
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3 Sheets-Sheet
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Nov.. 8, 1938.
H. J. TAPLIN
2y�?920
STRAPPING MACHINE
Filed Dec. 14, 1936
5 Sheets-Sheet
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Nw. s, 138.
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H J_ TAPUN
2,135,920
STRAPPING MACHINE
Filed Dec. 14, 1936
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Patented Nov. 8, 1938
2,135,92@
UNITED STATES PATENT OFFICE
2,135,920
STRAPPING MACHINE
Harold John Taplin, London, England, assignor
to Gerrard Industries Limited, London, Eng
land
Application December 14, 1936, Serial No. 115,886
In Great Britain February 27, 1936
6 Claims.
This invention relates to the strapping of pack
ages and other articles.
The invention has for object to provide im
proved. apparatus relating to strapping with wire
(Cl. MII-�)
the dog slips out of the slot and comes to ride on
the face of the gear during the backward stroke.
The slots 40 are shaped so that the gear 5, pinion
2 and the shaft 'I are driven on the backward `
5 and other materials, the ends of which material
are joined by twisting or other equivalent joint
forming operations, such as crushing or bending.
stroke of the lever 'I but remain idle during the
forward stroke.
Since there are two diametrically arranged slots
It is an object of the invention to provide a
hand-operated strapping machine in which an
in each gear, the dog which, has been riding on
the face of the respective gear during any par
ticular stroke of the handle 4 slips into a slot at
oscillating member is operatively connected to
carry out the twisting or other joint forming
operation during both strokes of its oscillation.
It is a further object of the invention to pro
vide a machine for making a twisted joint in
which two or more twister pinions or the like are
arranged for successive operation.
With these and other objects in view, the in
vention consists in the improved combinations
and arrangements contained in the embodiments
now to be described in detail, novel features of
which are set out in the claims which follow.
In the drawings#
Figure 1 is a front elevation, partly in section,
of one form of machine, parts being broken away,
Figure 2 is a plan view of part of the same
machine,
'
Figure 3 is a front sectional elevation of part
of a modified form of machine,
Figure 4 is a plan view of the parts shown in
.Figure 3,
Fig-ure 5 is a front elevation of the machine
shown in Figures 3 and 4, and
Figures 6 and '7 show examples of the knots
made by the machine of Figures 1 and 2 and
Figures 3, 4 and 5 respectively.
The machine shown in Figures 1 and 2 is
mounted on a base I and has right and left hand.
twisting pinions 2 and 3 respectively arranged to
be operated by a common operating lever 4
through timing gears 5 and 5 which are mounted
on a shaft l. 'I'he shaft ?I is carriedin bearings
in members B and 9 upstanding from the base
I, and also has freely mounted upon it the oper
_ ating lever 4. The timing gear 6 is freely
"i" mounted upon the shaft 'I whilst the timing gear
5 is keyed to the shaft as at 31.
The operating lever 4 carries spring-pressed
clutch dogs ID and II arranged to engage slots
or recesses 4I! and 4I formed in the inner faces
of the gears 5 and 6 respectively; two such slots
are formed in the face of each gear at diamet
rically opposed positions.
The slots 4I are so shaped that the timing gear
6 is positively engaged by the dog II for driving
? during the forward stroke of the lever 4, but that
the end of the stroke ready to take up the drive
during the next stroke.
Spring-pressed plungers 42 and 43 carried by
the members 8 and 9, are provided to engage
diametrically opposed holes 44 in the faces of
the gears 5 and 6 to hold them against rotation
except when positively driven by the lever 4.
In addition to the parts already mentioned,
the machine comprises means for locating and
retaining the wire during the operation of the
machine, means for tensioning the wire about
the article to be strapped and means for cutting
oi� the end of the wire, as will appear below.
In the use of the machine, the end of a length
of wire, drawn, preferably, from a coil, is passed
between a pivoted spring-pressed wire-gripper
I3 and the associated anvil I4, to abut against a
stop-plate I5 and is gripped by the gripper I3.
Its end having thus been located and'anchored
the wire is inserted in the slots of the twister
pinions 2� and 3 and in the holding slot I5, and is
passed round the article which is to be strapped;
the portion which then runs across the top of
the article from left to right as seen in the draw
ings, and leads to the free end, or the coil as the
case may be, is inserted in the slots of the twister
pinions and the holding slot I6, to lie against
the bight of wire already in these slots, and
between the pivoted spring-pressed wire-grippers
I'I and I8 and their associated anvils I9 and 20.
A pivoted wire-retaining latch 2l is provided to
retain the wire in position during the operation
of the machine.
.
v
It will be seen from the drawings that the> dis
tance separating the pinions 2 and 3 is twice that
separating each pinion from the nearest wire
holding means, that is between the pinion 3 and
the holding slot I6 and between the pinion 2 and
the adjacent edge of the anvil I4; moreover no
provision is made for holding the wire between 50
the two pinions.
The gripper I8 forms part of the wire-tension
ing mechanism and is carried by a member 23
which is slidably mounted on a shaft 24. The
member 23 isformed with a >helical cam-face 25
2
2,135,920
and a similar cam~face 21 of opposite hand is
formed on a 駒ed member 28 on which the grip
per I1 is pivotally mounted. A member 29, hav
ing an operating handle 30, is mounted on the
shaft 24 between the cam faces 26 and 21 and
itself has cam faces 3I and 32 for co-operating
with these cam faces. A spring 33 mounted on
the shaft 24 between the slidable member 23 and
a plate 34 tends to urge the member 23 towards
10 the left and to maintain engagement between the
respective cam> faces.
,
It will be seen from Figure 1 that the pivoted
grippers I1 and I 8 are self-locking to prevent'
relative movement of the wire in one direction,
15 that is from right to left as seen in the drawings,
of the other end part of the knot. This prevents
any weakness resulting from the neck of the Wire
behind the cut being twisted on its own axis when
the cut olf end is free.
Other advantageous features of the machine
just described concern the prevention of wastage,
especially when wire from a coil is used.
The use of stop-plate I5 enables the end of
each length of Wire to be located and thus deter
mines the correct length of wire for each op
10
eration.
Owing to the slope of the surface of the anvil
I4, the anchored end of the wire is pushed down
when tension is applied and no wire need be cut
off at this end to make a neat joint.
15
During tensioning, wire is fed back toward the
but will automatically pivot to allow relative
movement in the other direction. Thus when the , coil in a straight path and is cut off (being there
tensioning handle 30 is rotated 4about the axis by tucked down sufficiently) close to the end of
of the shaft 24, the cam action of the faces 26 the joint. There is thus no waste of wire, what
20 and 3I and 21 and 32 respectively causes the
ever, since the severed end of the Wire from the 20
gripper I8 to move to the right, drawing with it coil forms the end of the next loop which is
the wire which slides between the gripper I1 and pushed against the stop-plate I5.
anvil I9. Upon the return stroke of the handle
Figures 3, 4 and 5 illustrate a machine having
3D, the member 23 is returned toward the left but one twister pinion and designed to produce a
25 by its spring 33, the gripper I8 sliding over the joint comprising two sets of three twists each in
wire, which is held by the gripper I1, to grip it in opposite senses. In this machine, the devices
a fresh place ready for the next operative stroke provided for gripping, locating, retaining and
of the handle 30. The tensioning of the wire stretching the wire are similar to those of the
about the article can be continu-ed, by repeated machine illustrated by Figures l and 2, and, while
30 strokes of the handle 30, until the desired tension
such parts are omitted from Figures 3 and 4, 30
is obtained, this being determined either by the they appear in Figure 5 and in such Figure 5 are
operator or by an automatic clutch inserted be
designated by the same reference numerals as
tween the member 23 and its operating handle 30. similar parts in Figure 1.
When the tensioning of the wire has been com
The twister pinion 2 is in driving engagement
35 pleted, the operator effects the forward stroke of with a timing gear 5I which is mounted for 35.
the lever 4, during which the pinion 3 is rotated rotation about the axis of a shaft ?1, borne in
by the timing gear 6, rotating freely on its shaft bearings in members 8 and 9 upstanding from
1. This rotation of the pinion _3 results in the the base I.
two bights of wire which pass through its slot
The timing gear 5I is mounted upon and keyed
40 being twisted about each other twice between the
at 64 to a collar 65 Yof a bevel wheel 54 which is pinion 3 and the slot I6 and twice, in the opposite keyed to the shaft 1 at 62. A further bevel
sense, between the two pinions 2 and 3, there wheel 55 is loosely mounted on the shaft 1, and
being, as shown, a 4:1 reduction ratio between both bevel- wheels 54 and 55 engage a small idler
the timing gears and the pinions. Upon the com
bevel wheel 56, the vertical spindle 51 of which
45 pletion of the forward stroke of the lever 4, the is borne in a' portion 58 upstanding from the 45
operator reverses its direction and eifects the re-. base I.
turn stroke, during which the gear 5 and the
An operating lever 4 is freely mounted upon
shaft 1 are rotated in theY reverse direction. This the shaft 1, by a portion 59 which extends be
rotation results in the pinion 2 being rotated in tween the bevel wheels 54 and 55. The lever 4
50 the direction opposite to that in which the pinion carries a pair of pivoted spring-pressed dogs 6U .
3 was rotated 4and the two bights of wire are
and 6I, which are arranged to engage slots or
twisted about each other twice between the pinion recesses in the peripheral surfaces of the bevel
2 and the edge of the anvil I4, these twists being Wheels 54 and 55 respectively. These dogs are
in the same sense as those previously formed be
so formed that, during the forward stroke of
55 tween the pinion 3 and the slot I6. During this the lever 4 from the position shown in plan in
rotation of the pinion 2 two further twists are Figure 2, the dog 6| drives the bevel wheel 55
formed in the wire between the two pinions, these through positive engagement with the slot in that
twists being in the same sense as those previously wheel, whilst the dog 60 slides out of the slot in
formed in these portions of the bights of wire. the wheel 54, depressing its spring, and rides
60 The completed knot thus has four twists in the over the surface at the wheel which is driven 60
same sense, situated between two sets of two twists through the train 55, 5B and transmits drive to
each in the opposite sense, all the twists being of the timing gear 5I through the key 64.
approximately the same pitch.
. i
The directions of rotation of the wheels 54
During the rotation of the timing gear 5, the and 55 are opposed, so that, at the conclusion of
65 rotation of the shaft 1, which is keyed to it, the forward stroke of 180� revolution of the lever
4, the dog 60 again slips into the slot which it
causes the operation of a wire-severing. device
35 which is arranged to sever the outer bight only, left at the beginning of the stroke. During the
that is therbight leading to the free end or to return stroke of the lever 4, owing to the shape of
the coil. The wire severing device is operated the dogs, the dog 50 drives the wheel 54 through
70 through a cam 45 keyed to the shaft 1.
positive engagement with the associated slot, 70
From the above description it will be seen that whilst the dog 6I leaves the slot which it had
the end part of the knot remote from the'an
previously engaged and slides over the peripheral
chored end is flrst'completed (by rotation of the surface of the wheel 55 to engage the slot again
pinion 3) and the wire is severed near this comat the completion of the stroke.
75 pleted portion of the knot during the formation
Owing to the alternate driving engagement of 75
2,135,920
the lever 4 with the bevel wheels and the pro
vision of the idler wheel 56, the direction of ro
tation of the timing gear, and thus of the twist
ing pinion 2, is constant.
.
The shaft 1 is also driven in constant direction
and operates wire-severing mechanism by means
of a cam 45 keyed to the shaft.
A spring-pressed plunger 42 is provided in the
member 8 to co-operate with a hole 44 in the
10 timing gear 5I to locate the latter at the com
pletion of the return stroke of the operating lever.
I claim:
1. A hand-operated strapping machine com
prising an oscillating lever or the like, a twisting
3
4. A hand-operated strapping machine corn
prising an oscillating lever, a twisting pinion, agear wheel meshing with said twisting pinion, a
unidirectional clutch device for connecting said
oscillating lever to said gear wheel to rotate it
during oscillation in one direction, reversing
gearing, and a second unidirectional clutch de
vice for connecting said oscillating lever to said
twisting pinion through said reversing gearing
during oscillation in the other direction.
10
5. A hand-operated strapping machine com
prising an oscillating member, a twisting pinion,
reversing gearing comprising a pair of toothed
wheels and a common idle wheel meshing with
said oscillating lever or the like to said twisting
pinion during oscillation in either direction, and
said pair of toothed wheels, a unidirectional
clutch device for connecting said oscillating
member to said twisting pinion during oscilla
reversing gearing through which said oscillating
tion in one direction, and a second unidirectional
lever or the like is connected to said twisting
pinion during oscillation in one direction.
2. A hand-operated strapping machine com
prising an oscillating member, a twisting pinion,
reversing gearing comprising a pair of bevel
wheels and a common idle bevel wheel, and uni
directional clutches whereby said oscillating
member is connected to said twisting pinion dur
ing oscillation in either direction, the connection
during oscillation in one direction being through
clutch device for connecting said oscillating
member to said twisting pinion during oscilla 20
pinion, unidirectional clutches for connecting
said reversing gearing.
3. A hand-operated strapping machine com
30
prising a twisting pinion, an oscillating member,
and mechanism whereby said oscillating mem
ber is operatively connected to said twisting pin
A.ion to rotate it in the same direction during
oscillation of said member in either direction.
tion in the other direction, the connection of
said oscillating member to said twisting pinion
during oscillation in one direction being through
said reversing gearing.
6. A hand-operated strapping machine com
prising a twisting pinion, -an oscillating mem
ber, means for connecting said oscillating mem
ber to said twisting pinion during oscillation in
one direction to rotate it in a certain direction, 30
and means for connecting said ~oscillating mem
ber to said twisting pinion during oscillaton in
the opposite direction to rotate it in the said
certain direction.
HAROLD JOHN TAPLIN.
35
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