To obtain the optimum cycling frequency, the control
line between valves 20 and 21 should not exceed
two metres in the pneumatic control (Fig. I). The
control signal for valve 20 can be obtained linearly or
rotary as required. With linear pick-up, an adjustable
control rail must be mounted on the press ram. With
press strokes over
mm, only rotary signal pick-up
is possible.
Reverse control (if feed unit is to operate in the
opposing direction)
Reversal of the feed direction and opposite start-
ing position of the slide: interchange connections
C and D.
In general, the rotary type of signal pick-up is to be
preferred. This usually allows one to avoid resetting
of the control rail if tools are changed.
With both types of control, the timing of the pulse
output for the feed should be selected such that the
rams have wiped off and the tape is freely located in
the tool. The feed should be completed no later than
after upper dead centre.
Reversal of feed direction with same starting posi-
tion of the slide: interchange connections A and B.
Reversed starting position of the slide with same
feed direction: interchange connections A and B
and also C and D on the feed unit housing.
slackened.
The grippers can be shifted through
such that the
opening is on the opposite side. To do this, the
socket head cap screws (7, front side) must be
Example:
Pneumatic control
control
elements
N a m e
(100)
c o n t r o l
A i r - o p e r a t e d v a l v e
s o l e n o i d v a l v e
21
R o l l e r l e v e r v a l v e
22
H a n d s l i d e v a l v e
23
u n i t
24
S o l e n o i d v a l v e
w i t h
e x h a u s t )
25
H a n d
valve
( o n l y
t a p e
s t o p )
P r e s s u r e r e g u l a t o r
( o n l y
feed)
Tools with catch pins
Where cycling rate and ram stroke permit, it is pos-
sible to momentarily exhaust the holding grippers
with tools having catch pins (locating pin, pilots). A
solenoid valve type
(24) fitted in line B
and operated by means of a cam disc and a limit
switch exhausts the holding gripper as soon as the
catch pin is inserted in order that the strip can be
centered.
The solenoid valve (Fig. 2. item 20) obtains its reversal
pulse from an electrical limit switch.
Item
N a m e
27
1
Quick
1
Socket
1
30
c o n n e c t o r
2
31 connector
4 4
c o n n e c t o r
3
3
2
2
A service unit type FRC must befitted on the upstream
side of the entire control system. With this unit, the
compressed air is cleaned, regulated to constant
pressure (6 bar), and provided with a fine oil mist
lubricating purposes. The bearing bushes of the feed
brace must be lubricated from time to time by means
of lubricating nipple (II).
Summary of Contents for BV-50- 40
Page 4: ......
