Festo DFST-32 G2 Series, Operating Instructions, Page: 1 / 4

Translation of the original instructions
© 2020 all rights reserved to
Festo SE
& Co. KG
1 Applicable Documents
All available documents for the product
è
www.festo.com/sp.
2 Safety
2.1 Safety instructions
– Take into consideration the ambient conditions at the location of use.
– Only use the product in original status without unauthorised modifications.
– Observe labelling on the product.
– Store the product in a cool, dry, UV-protected and corrosion-protected envir-
onment. Ensure that storage times are kept to a minimum.
– Prior to mounting, installation and maintenance work: Switch off compressed
air supply and secure it from being switched back on.
– Observe tightening torques. Unless otherwise specified, the tolerance
is ± 20 %.
2.2 Intended Use
The stopper cylinder DFST is designed for use as a retractable fixed stop in order
to reach defined holding positions with transported material (e.g. on mounting or
sorting systems). The DFST sorts the stationary transported material in buffer
zones.
Fig. 1 Stopping transported material
2.3 Foreseeable misuse
With DFST-...-L: the toggle lever must not be overrun in the stop direction by the
transported material when the lever locking mechanism is active. Otherwise the
transported material will damage the locking mechanism.
2.4 Training of qualified personnel
Installation, commissioning, maintenance and disassembly should only be con-
ducted by qualified personnel.
The skilled personnel must be familiar with the installation of pneumatic control
systems.
3 Further information
– Accessories è www.festo.com/catalogue.
– Spare parts è www.festo.com/spareparts.
4 Service
Contact your regional Festo contact person if you have technical questions
è www.festo.com.
5 Product overview
5.1 Function
The stopper cylinder DFST is a double-acting cylinder. The piston rod is extended
with the toggle lever mechanism by pressurising the supply port
1 . The toggle
lever gently stops the incoming transported material with the integrated shock
absorber. The piston rod is retracted by pressurising the supply port 2 . The
stopper cylinder with spring return (not applicable for DFST-...-D/DL) can also be
set to single-acting. This is done by screwing a silencer into the supply port
1 .
This makes sense if reduced extension velocities are sufficient.
Lever Locking Mechanism
With the stopper cylinder DFST-..-L with a factory-installed lever locking mechan-
ism, the toggle lever locks into its end position. When the stopper cylinder is
retracted, the toggle lever locking mechanism is automatically deactivated.
5.2 Structure
1 Supply port (extending, 2x)
2 Supply port (retracting, 2x)
3 Guide rod for protection against
rotation
4 Piston rod
5 Detent for knurled nut
6 Roller toggle lever
7 Stop roller
8 Thread for inductive proximity
sensor (2x)
9 Lever locking mechanism (option-
al)
10 Knurled nut for setting the cush-
ioning
11 Stop for lever locking mechanism
12 Hole for mounting toggle lever
deactivation mechanism
13 Through-hole for mounting (4x)
14 Slot for proximity sensor (6x)
Fig. 2 Product design
8123248
DFST-32-...-G2
Stopper cylinder
8123248
2020-01
[8123250]
Instructions | Operating
Festo SE
& Co. KG
Ruiter Straße 82
73734 Esslingen
Germany
+49 711 347-0
www.festo.com