OIL-HYDRAULIC PRESSES WITH TWO UPRIGHTS
OPERATION AND MAINTENANCE MANUAL
40
7.12
ENCODER
The encoder is a position transducer used in the presses
to detect the slide and blank-holder cushion stroke.
The machine is fitted with two identical encoders for this
purpose; the functioning principle of the slide encoder is
illustrated by the drawing given here.
One cam, which activate two limit-switchs, is used to the
stop the machine in the event of slide overstroke; this
cam act as safety devices and under no circumstances
should they be moved.
The mechanical application of the cushion encoder differs
from that of the slide encoder since it does not involve the
use of the P.M.B. overstroke micro-switch.
Normally the safety limit switch and pressure-switch are
not activated, therefore during general machine
maintenance, make sure that these are working
correctly.
Since the encoders are electronic devices which detect
the position of the slide and the blank-holder, their
malfunctioning is immediately evident.
Maintenance operations should only be carried out
on the encoders after the voltage has been
disconnected from the electric circuits of the
machine.
The following table contains the description of parts which may have to be replaced.
Pos.
Function
Make
Type
Omera’s Code
1
Actuator for encoder
STEGMANN
2
Slide position
encoder
STEGMANN
AG 626 XSR SL 3002
8832010L
3
Slide overstroke at
T.D.C.
TELEMECANIQUE
Limit switch
ZCK-J1 + ZCK-E67
84415000
8441511A
4
Slide connection point
at T.D.C.
TELEMECANIQUE
Limit switch
ZCK-J1 + ZCK-E67
84415000
8441511A
5
Slide overstroke at
B.D.C.
TELEMECANIQUE
Limit switch
ZCK-J1 + ZCK-E67
84415000
8441511A
DANGER:
THE ENCODER IS A WIRE TYPE ENCODER AND THEREFORE, EVEN THOUGH IT IS
INSTALLED IN A SAFE POSITION, IT CAN BE TAMPERED WITH OR MANUALLY
PULLED. THIS IS VERY DANGEROUS BOTH FOR STAFF AND FOR THE MACHINE AS
IT MAY CAUSE THE SLIDE OR CUSHION TO MOVE.
