l
5,708,339
11
and
32
will
move
the
neck
of
the
bag
into
engagement
with
bag
stop
80
causing
the
neck
to
be
gathered.
As
the
trailing
edge
of
the
neck
of the
bag
passes
over
the
end
of
switch
arm
88.
switch
arm
88
will
move
back
to
the
position
illustrated
in
FIG.
3
causing
switch
86
to
send
a
signal
to
the
micro
controller
for
starting
a
new
tying
cycle.
A
schematic
diagram
of
a
motor
controller
92
is
illustrated
in
FIG.
9
of
the
drawing.
The
optic
coupler
C0
delivers
a
PWM
signal
to
the
positive
terminal
CH1
from
driver
circuit
C2
with
reference
to the
negative
terminal
CH1.
The
positive
terminal
CH1
is
connected
through
resistor
R14.
resistor
R15
and
diode
D11
to
the
base
terminal
of
high
rail
MPS651
transistor
Q7.
The
negative
terminal
CH1
is
connected
through
resistor
R18
to
the
base
of
2N2222A
transistor
Q11
and
through
a
750
ohm
resistor
R92
to a
negative
8
volt
terminal
and
to the emitter
of
transistor
Q11.
A
56
ohm
resistor
R22
forms
a
shunt
between
the
base
and
emitter
of
transistor
Q11.
The
collector
of
transistor
Q11
is
connected
between
resistors
R14
and
R15.
The
1
ohm
resistor
R15
is
connected
through
HMLP170O
diode
D13
to
the
base
of
low
rail
MPS751
transistor
Q9.
Transistor
Q11
turns
off
and on
to
turn
transistors
Q7
and
Q9
off
and
on.
which
in
turn.
turn the
high
rail
MJl1033
power
transistor
Q5
and
the
low
rail
MJ11032
power
tran
sistor
Q13
oif
and
on.
The
collector
of
high
rail
transistor
Q7
is
connected
through
a
300
ohm
5
watt
resistor
R11
to
the
base
of high
rail
power
transistor
Q5.
The
emitter
of
high
rail
transistor
Q5
is
connected
to
a
+34
volt
DC
terminal
while
the
collector
of
power
transistor
Q5
is
connected
through
an
MR822
diode
D9
to
a
line
connected
to
one
side
of
the
winding
of
motor
M2.
The
collector
of
low
rail
transistor
Q9
is
connected
through
a
300
ohm
5
watt
resistor
R20
to
the
base
of
low
rail
power
transistor
Q13.
The
emitter
of
low
rail
power
tran
sistor
Q13
is
connected
to
a
—34
volt
DC
terminal
while
its
collector
is
connected
through
MR822
diode
D16
to
the
line
connected
to
one
side
of
the
winding
of
motor
M2.
When
the
PWM
signal.
delivered
to the
terminals
marked
CH1
is
not
conducting
current,
high
rail
transistor
Q7
and
high
rail
power
transistor
Q5
are
turned
on
for
delivering
a
positive
34
volt
direct
current
to the
motor
winding
causing
motor
M2
to
tend
to
move
in
a
clockwise
direction.
When
the
PWM
signal.
delivered
to
the
terminals
marked
CH1,
are
conducting
current.
low
rail
transistor
Q9
and low
rail
power
transistor
Q13
are
mined
on
for
delivering
a
negative
34
volt
direct
current
to
the
motor
winding
causing
motor
M2
to
tend
to
move
in
a
counter-clockwise
direction.
The
ratio
of
time
in
which
the
PWM
signal
is
in
either
state
determines
the
direction
and
speed
of
the
motor.
To
protect
high
rail
power
transistor
Q5
and low
rail
power
transistor
Q13
from
being
conducting
at
the
same
time
due
to
diiferences
in
manufactured
component
switch
ing
times.
high
rail
inhibit
transistor
Q17
disables
high
rail
transistor
Q7
from
turning
on
as
long
as
low
rail
power
n'ansistor
Q13
is
turned
on.
Likewise
low
rail
inhibit
transistor
Q1
inhibits
low
rail
transistor
Q9
from
turning
on
if
there
is
a positive
voltage
at
the
collector
of high
rail
power
transistor
Q5
su?icient
to
forward
bias
low
rail
inhibit
transistor
Q1.
The
high
rail
inhibit
circuit
11-1
is
connected
from
the
collector
of
the
low
rail
power
transistor
through
diodes
D18
and
D21
and
resistor
R29
to the
base
of
high
rail
inhibit
transistor
Q17.
The
emitter
of
high
rail
inhibit
transistor
Q17
is
connected
to
the
base of
high
rail
transistor
Q7.
The
low
rail
inhibit
circuit
IL
is
connected
from
the
collector
high
rail
power
transistor
Q5
through
diodes
D7
and
D5
and
resistor
10
20
25
45
65
12
R3
to
the
base of
low
rail
inhibit
transistor
Q1.
The
emitter
of
low
rail
inhibit
transistor
Q1
is
connected
to
the
base
of
low
rail
transistor
Q9.
The
low
rail
and
high
rail
inhibit
circuits
1H
and
IL
assure
that
the
control
output
voltage
be
260
before
switching
occurs.
The
inhibit
circuits
protect
the
power
transistors
Q5
and
Q13.
It
is
to
be
understood
that
while
detailed
descriptions
of
a
preferred
embodiment
has
been
illustrated
and
described.
the
invention
is
not
to
be
limited
to
the
speci?c
arrangement
of
parts
and
speci?c
features
herein
described
and
illustrated
in the
drawing.
Rather.
the descriptions
are
merely
of
an
exemplary
embodiment
of
the
invention.
which
may
be
embodied
in
various
forms.
Having
described
the invention.
we
claim:
1.
Apparatus
for
securing
a
bundle
of
gathered
material
comprising:
a
frame
having a
slot
de?ning
a
path;
a
shaft
secured
to
said
frame;
a
stop
lever
mounted
on
said
shaft
for
rotary
movement
about
an
axis;
an
electric
brake
mounted
between
said
stop
lever
and
said
frame;
an
electric
circuit
having
a
timer
connected
to said
electric
brake;
and
a
switch
in
said
electric
circuit.
said
switch
having an
arm
positioned
to
extend
across
said
path.
said
switch.
timer
and
electric
brake
being
connected
to
momentarily
lock
said stop
lever
in
a
position
extending
across
said
path
such
that
material
moving
along
said
slot
is
gathered
adjacent
said
stop
lever.
2.
Apparatus
for
securing
a bundle
of
gathered
material
according
to
claim
1
with
the
addition
of
a
source of
ribbon;
a
holder-shear
assembly
for
cutting
the
ribbon
and
grip
ping
the
free
end
of
said
ribbon;
a
pulley
engaging
said
ribbon
between
said
source
of
ribbon
and
said
holder-shear
assembly;
a
proximity
switch
adjacent
said
pulley;
and
a
needle
engaging
said
ribbon
between
said
pulley
and
said
holder-shear
assembly,
said
needle
being
con?g
ured
for
wrapping
the
ribbon
around
material
gathered
adjacent
said
lever.
said
proximity
switch
being
mounted
in
a
circuit
con?gured
to
indicate
when
the
ribbon
has
been
wrapped
around
gathered
material
adjacent
said
lever.
3.
Apparams
for
securing
a
bundle
of
gathered
material
according
to
claim
1.
said
shaft
extending
through
said
electric
brake
such
that
movement
of
said
stop
lever
is
restrained
when
said
electric
brake
is
energized.
4.
Apparatus
for
securing
a
bundle
of
gathered
material
according
to
claim
3.
said
timer
being
electrically
connected
between
said
electric
brake
and
said
switch
for
de-energizing
said
electric
brake
at
the
expiration
of
a
predetermined
period
of
time
after
said
electric
brake
has
been
energized.
5.
Apparatus
for
securing
a bundle
of
gathered
material
according
to
claim
3.
with
the
addition
of
a
biasing
mecha
nism
connected
between
said
shaft
and
said
frame
to
resil
iently
we
said
bag
stop
toward
a
predetermined
home
position.
6.
Bag
neck
tying
apparatus
comprising:
a
frame
having
a
slot
de?ning
a
path;
a
source
of
ribbon
for
dispensing
a
strand
of
ribbon
having
a
free
end
and
a
central
portion;
a
holder-shear
assembly
on
said
frame
for
cutting
the
ribbon
and
holding
the
free
end
of
said
ribbon;