l
5.708.339
5
of the
gathered
neck
After
the
gathered
neck
passes
lever
80.
the
lever
80
moves
back
to
the
illustrated
position
extending
across
path
12.
A
needle
assembly
40.
best
illustrated
in
FIGS. 1-4
and
7.
is
positioned
for
wrapping
a
strand
15
of
ribbon
material
around
a gathered
neck
of
a
bag.
The
needle
assembly
40
comprises
a
needle
42
carrying
idler
rollers
44.
44a
and
44b.
The
needle
42
is
mounted
on
the
output
shaft
45
of
a
gear
box
46
driven
by
motor
M2.
Needle
42
is
shown
in
its
home
position
in
FIGS.
1
and
2
of
the
drawing.
Motor
M2
moves
needle
42
from
the
full
outline
position
to
the
dashed
outline
position.
illustrated
in
FIG.
2
of
the
drawing.
and
then
reverses
for
moving
the
needle
42
back
to
the
position
illustrated
in
full
outline
in
FIG.
2.
Referring
to
FIGS.
1.
3
and
7
of
the
drawing.
a
twister
hook
assembly
50
comprises
a
twister
shaft
52
rotatably
mounted
in
a
bearing
53
having
a
hook
54
on one end
thereof
and
a
pulley
55
on
the
other
end.
A
drive
pulley
56
is
mounted
on
the drive
shaft
of
motor
M3
and
drives pulley
55
through
a
belt
58.
As
best
illustrated
in
FIGS.
1.
2.
5.
7
and
14
of
the
drawing.
a
ribbon
holder-shear
assembly,
generally
desig
nated
by
the
numeral
60,
comprises
a holder
and
shear
assembly
of
the
type
disclosed
in
US.
Design
Pat.
No.
307.281
to
Charles
E.
Burford
and
US.
Pat.
No.
4.856.258
entitled
WIRE
TYING
DEVICE,
which
issued
Aug.
15.
1989.
to
Charles
E.
Burford
and
Jimmy
R.
Frazier.
The
holder-shear
assembly
60
comprises
a
gripper
arm
62
having
a
gripper
?nger
64
on
one
end
thereof
rotatably
secured
to
a
mounting
plate
66 by
bolt
65.
A
pair
of
anvils
68
and
69
are
formed
on
the
end
of
mounting
plate
66,
each
being
associated
with
shear
surfaces
68a and
69a
to
grip
and
cut
a strand
ribbon
as
will
be
hereinafter
more
fully
explained
Referring
to
FIGS.
5
and 7
of
the
drawing.
a
cam
70
is
mounted
on
the
shaft
of
motor
M4
and
is
con?gured
to
engage
cam-followers
72
and
74
on
spaced
am
71
and
73
secured
to
and
actuating
rod
75
mounted
for
reciprocating
movement
in
bearings
76.
A
link
75a
secures
the
end
of
gripper
arm
62
to
actuating
rod
75.
It
should
be
readily
apparent
when
the
shaft
of
motor
M4
rotates
one-half
revolution.
cam
70
will
exert
force
through
cam-followers
72
and
74
for
moving
actuating
rod
75
for
pivoting
the
actuating
arm
62
about
bolt
65.
The
free
end
of
the
ribbon
is
gripped
between
the
end
of
gripper
?nger
64
and
anvil
68
or 69,
depending
on
which
direction
the
gripper
?nger
64
is
shifted.
As
will
be
hereinafter
more
fully
explained.
when
needle
42
wraps
the
intermediate
section
of
the
ribbon
15
around
the
gathered
neck
of
a
bag, the
ribbon
will
be
positioned
between
gripper
?nger
64
and
the
othtn
anvil
68
or
69.
When-gripper
?nger 64
is
shifted
to
its
opposite
position,
the
ribbon
will
be
cut
and
the
free
end
of
the strand
of
ribbon
will
be
gripped
between
gripper
?nger
64
and
anvil
68
or
69.
Referring
to
FIGS.
12
and
13
of
the
drawing,
roller
41
has
a
plurality
of
index
points
41x.
In
the
illustrated
embodiment,
the
index
points are
formed
by
steel
dowel
pins
circumferentially
spaced
around
the
axis
about
which
roller
41
rotates.
A
proximity
switch
41s
is
positioned
near
index
pointers
41x
for
mailing
an
electrical
circuit
when
the
presence
of
an
indexing
pin
41.):
is
sensed.
The
proximity
switch
41s
is
of
conventional
design
and
is
connected
through
a
suitable
power
supply
and
ampli?er
to the
CPU
96.
Thus.
the
CPU
monitors
the
proximity
output
and
counts
the
pulses
produced
by
index
pins
41.x
in
roller
41.
The
CPU
96
calculates
the
amount
of
ribbon
dispensed
to
determine
10
20
25
30
35
45
55
65
6
whether
or
not
a
bag
neck
is
present
as
needle
42
moves
from
the
full
outline
position
illustrated
in
FIG.
2
of
the
drawing
toward
the
dashed
outline
position
illustrated
in
FIG.
2
of
the
drawing.
If
needle
42
did not
wrap
ribbon
around
a
bag
neck.
the
CPU
will
terminate
a
portion
of
the
remainder
of
the
cycle
of
operation
so
that
holder-shear
65
will
not
be
actuated
to
prevent
releasing
the
end
of
ribbon
15
which
is
gripped
between
gripper
?nger
64
and
anvil
68
or
69.
Referring
to
FIGS.
1.
2
and
3
of
the
drawing,
a
bag
stop
lever
80
is
mounted
on
a
shaft
85
for rotary
movement
about
a
horizontal
axis.
Shaft
85
extends
through
an
electric
brake
82
and
has
a crank
arm
85a
secured
thereto
which
is
resiliently
urged
in a
clockwise
direction.
as
viewed
in
FIG.
3.
by
a
spring
83.
A
switch
86
is
actuated
by
switch
arm
88,
which
actuates
a timer
for
energizing
electric
brake
82
which
momentarily
locks
bag
stop
80
in
a
?xed
position
for
a
predetermined
period
of
time. for
example
0.25
seconds
for
restraining
the
leading
edge
of a
bag
neck.
such
that
gathering
belts
22
and
32
will
gather
the
neck
adjacent
bag
stop
80.
At
the
expiration
of
the
predetermined
period
of
time.
electric
brake
82
will
be
tie-energized
so
that
linear
movement
of
the
bag
neck
will rotate
bag
stop
80
upwardly
to
release
the
bag
so
that
it
will
be
moved
away
by
the
conveyor.
Bag
stop
80
is
biased
toward
the
position
illustrated
in
FIG.
3
of
the
drawing
by
a
spring
83.
It
should
be
readily
apparent
that
the
spring
83
may
be
replaced
by
a
counter-weight.
air
cylinder
or
other
suitable
biasing
mechanism
to
resiliently
urge
bag
stop
80
toward
its
home
position.
Motors
M1, M2.
M3
and
M4
are
bi-directional.
penna
nent
magnet.
DC
brush-type
servomotors
having
outputs
proportional
to
the
voltage
applied
across the
armatures.
Such
motors
are
commercially
available
from
Groschopp.
Inc.
of
Sioux
Center,
Iowa
as
a
“Power
Master
8304” 24
volt
DC
continuous
power
motor.
At
1500
rpm
the
motor
gen
erates
l6
oz-in
torque
and
has
an
output
of
0.090
horsepower
at
4.2
amps.
At
2450
rpm
the
torque
is
47
oz-in
and
the
output
is
0.113
horsepower
at
5
amps.
At
5400
rpm
the
torque
is
37
oz-in
and
the
output
is
0.197
horsepower
at
8.2
amps.
It
is
noted
that
other
motors
and
motors
of
other
sizes
may
be
provided
to
facilitate
driving
the
various
assemblies.
For
example.
it
is
contemplated
that
smaller
motors
would
be
used
in
a
counter
top
model
used
for
gathering
and
fastening
materials
such
as
coils
of
electrical
cord.
water
hose,
tubing.
or
yarn,
and
bundles
of
cable.
rods.
or
carrots
and
other
produce.
One
side
of
the
armature
winding
of
each
motor
M1. M2.
M3
and
M4
is
connected
to
ground
such
that
reverting the
polarity
of
current
through
the
armature
winding
reverses
the
direction
of
rotation
of
the
motor.
Each
of
the
motors
M1. M2.
M3
and
M4
has
an
encoder
E1,
E2.
E3
or
E4
mounted
on
its
drive
shaft
which
delivers
an
electrical
signal
to a
decoder
D1.
D2,
D3
or
D4
which
is
representative
of
the
position
of
the
motor
shaft.
Motor
Controller
Referring
to
FIGS.
7
and 8
of
the
drawing,
the
numeral
90
generally
designates
a
power
supply
for
delivering
electric
current
to
motor
controller
91 and
to
motor
M1
in
the
bag
neck
gathering
mechanism
21);
motor
controller
92
and
motor
M2
in
the
needle
assembly
40;
motor
controller
93
and
motor
M3
in
the
twister
assembly
50;
and
motor
controller
94
and
motor
M4
in the
holder-shear
assembly
60.
Referring
to
FIG.
8
of
the
drawing.
the
power
supply
90