
123
ADJUSTMENTS - MAINTENANCE
FEED ROLL STOPPING SYSTEM - FIGURE 177
The mechanical stopping system of the metal detector
allows the feed rolls to stop within 1/20 of a second when
ferrous metal is detected. This mechanism includes a
stop pawl (item 1) controlled by a solenoid (item 2), a
ratchet wheel (item 3), a rubber disc shock absorber
(item 4), an overload clutch (item 5) and a transmis-
sion actuator that switches from the FORWARD to the
NEUTRAL position automatically.
Periodically check these components for proper oper-
ation. Make sure that all bolts and nuts are well tight-
ened. Tighten the stop pawl bolt (item 10) and make
sure the stop pawl rotates freely.
The spring tension (item 6), the small chain (item 8), the
solenoid rubber protector (item 7) and the solenoid cap
(item 9) should all be checked for proper operation.
Tighten the two bolts on the 1” dia shaft (item 11) and
lightly tighten the bolt (item 12) to allow the free move-
ment of the metal detector stopping system.
Tighten the rubber washers by tightening the nut (item
14) until only one or two threads exceed the nut.
Adjust the stop pawl chain (item 8) so that the pawl
clears the ratchet wheel (item 3) when the solenoid is
energized. Once the solenoid is energized, the chain
must have
some loose when you try to pull back the
stop pawl manually.
Inside the solenoid, a micro-switch shifts the solenoid
from the “pull“ to the “hold“ coil. The “pull“ coil draws
30 amps and is sustained only a few seconds by the
system.
If the pull coil is on for a longer period, the system will
emit a fast “beep”. The “hold“ coil draws only 0.7 amps.
The solenoid (item 2) can be checked with an oheter.
The “pull“ coil should read 0.7 ohm between the solen-
oid connections when the system is off.
The “hold“ coil can be tested by pushing the piston com-
pletely inside (against the micro switch) and should read
17 ohm when the system is off.
4
13
13
12
12
6
9
5
1
10 3
8
7
2
11
14
Figure 177 Feed roll stopping system
Manual
No
. F4117E987E V1.1