US 3,942,686 AGranted

Glueing device

AssigneeInvolvo AG

InventorOscar Roth

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Abstract

The gluing device includes a glue storage and heating unit, a valve unit, a pump unit, a pressure-equalizing unit and a nozzle head. A support is provided which has two parts which are thermally insulated from one another, one of the parts supporting the glue storage and heating unit, and the other part supporting and including the other units and the nozzle head. Two separately energized heating rods are provided, each of which heats one of the parts of the support. An actuating arrangement is provided for the pump unit and includes an actuating piston reciprocating in a cylinder bore and actuated by a pressurized medium introduced into the cylinder bore and connected to the pump unit. A control arrangement controls the supply of the pressurized medium into the cylinder bore of the actuating arrangement and includes a switch, a rod mounted for retarded movement in the actuating arrangement in axial parallelism with the cylinder bore and acting on the switch, and a pair of abutment pins connected to the rod and extending into the path of reciprocation of the actuating piston so that said pins and said rod share the movement of the actuating piston when the latter approaches any one of the end positions thereof with the attendant actuation of the switch in a sense reversing the mode of operation on the actuating arrangement.

Claims6

Dependent claims

A gluing device for packing machines comprising, in combination, glue storing means;

nozzle means;
control means for said nozzle means;
pump means intermediate and in communication with said glue storing means and said nozzle means and including a double-acting reciprocating pump having a pump casing and a piston mounted in said casing for reciprocation with respect thereto;
support means for said glue storing, pump and nozzle means;
heating means connected to said support means;
and actuating means for said pump means comprising a cylinder housing connected to said casing and defining a cylinder bore, an actuating piston mounted in said bore for reciprocation therein between two end positions, means for supplying an actuating medium into said cylinder bore so as to reciprocate said actuating piston therein, a piston rod connecting said piston to said actuating piston so that the former shares the reciprocating movement of the latter, and means for controlling said supplying means and including a control rod mounted for movement in a bore provided in said cylinder housing in axial parallelism with said cylinder bore, a pair of abutment screws connected to said control rod and projecting into said cylinder bore and into the path of reciprocation of said actuating piston, a spring-biased braking pin acting on said control rod so as to prevent the latter from conducting movement axially of said bore when said abutment screws are out of contact with said actuating piston and to permit such movement when one of said abutment screws is contacted by and entrained by said actuating piston as the latter approaches one of said end positions thereof, and a switch operative for controlling the flow of the actuating medium into said cylinder bore and having a cam cooperating with said control rod.

3 more elements

Dependencies are inferred from the claim text.