40
Tanco Autowrap 1514-1510
Operator’s manual
14.4 WRAPPING ARM BLOCK
The wrapping arm block is mounted on the tower, and contains 4 valves.
(On TWIN machines there is an additional electro-magnetic reversing valve, V35).
When the wrapping arm starts the oil pressure releases the brake. When the brake is
operated there is however a need for a slight delay here so as to prevent the wrapping
arm stopping too abruptly. This is achieved by a nozzle which is fitted in the hexagon
nipple of the brake.
V16
Check valve
This prevents the oil flowing back to V10. It is fitted inside the block and can only be
reached by removing the entire block from its mounting.
V17
Safety valve on the plus side
This makes the wrapping arm stop smoothly and prevents the build-up of high pressure
on the motor's outflow side when the arm stops. The valve releases oil from the outflow
side of the motor into the inflow side.
V18
Safety valve on the minus-side
This limits the maximum torque on the wrapping arm. The valve releases excess oil into
the motor's outflow side. It is adjusted so that the traction out on the wrapping arm is
approximately 35 kilo.
V19
Holding valve
(Over center valve)
This valve regulates the oil flow out the outflow side to maintain a constant pressure on
the wrapping arm motor. This makes the motor run evenly so the brake does not have
to be operated even if the wrapping arm runs a bit "downhill" (when the machine is
wrapping while on a slope).
V35
Reversing valve (TWIN models)
(Electric cable no. 14) (Fig14-6)
When a TWIN machine has completed a wrapping sequence, the wrapping arm
reverses before the next bale. At this point the computer sends a signal to V35 which
reverses the oil flow to the wrapping arm motor and so makes the wrapping arm
reverse.
V17
V18
V19
V35
