conveyor belts for - MEYER Industrie-Electronic GmbH

The central functional element of
the alarm signal post type SM is the
pull-rope emergency switch NSR or
SN; the switch mechanism is
constructed in a manner which
ensures that it remains functionable
even if the retraction spring is
broken. In order to prevent loss of
functional safety as a result of
soiling, the retraction spring is
located inside the housing.
The pull-rope emergency switch is
- accordance with trade association
recommendations - fitted with a
locking mechanism which becomes
effective when the switch is
operated. Unlocking can be
undertaken locally by means of a
release lever, which is firmly
attached. The device comes with
Fig. 2 Dimension Drawing
two switching elements; provision
is made for extension by a further
switch element. Selflubricating
sinter bearings ensure almost
complete freedom from maintenance
work. The pull-rope
- attached at both sides of the
switch lever - protects a length of
up to 100m. The use of a rope
break safety device ensures that
the switch is automatically
actuated in the event of a one
sided cutting of the pull-rope.
Mode of operation
The switch lever of the pull-rope
emergency switch is reflected by
pulling the rope and the switching
element is actuated. The NOcontact
of the element opens the
safety chain of the controls and
Fig.3 Terminal Diagram
thereby effects switching-off the
conveyor belt drive and, at the
same time, the flashing light and
the horn are activated. The
location of the switch-off can thus
be identified by signals, which can
be seen and/or from a distance.
The locking device, which comes
into play upon deflection of the
switch lever, holds the switch
mechanism in the OFF-position.
The locking device can be
released by the firmly attached
component lever, depending on
the respective works regulations.
The built-in switch elements have
snap-contacts and a compulsory
opening system and thus meet
international safety regulations..