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US 5,398,448 AGranted
Apparatus closing mechanism, particularly for film welding devices
AssigneeKallfass Verpackungsmaschinen GmbH & Co.
InventorKarl-Heinz Kallfass
Life of this patent
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Abstract
The welding frame (3) of a film-welding device (2) is at the start of its pivoting movement motor-driven in positive manner over a few radians and is then released from the drive, so that only on the basis of its flywheel energy and weight force is it moved on to the locked closed position. Thus, accident risks can be avoided without separate control means, because for stopping the welding frame (5) it is essentially only necessary to dissipate the relatively low flywheel energy.
Claims24
An apparatus closing mechanism comprising:
- a base (16);
- at least one closing unit (3) movably mounted on said base (16) by at least one bearing (17), said closing unit (3) being displaceable between a closing position and an initial position in an operating motion and over a closing path including a first path section and a second path section, said second path section connecting to said first path section at an intermediate position between said initial position and said closing position, said second path section connecting to said closing position;
- a drive (13) for operably displacing said closing unit (3) with a specified drive torque;
- and
- a drive connection for drivingly connecting said drive (13) with said closing unit (3), wherein control means are provided for reducing said drive torque with respect to said first path section as a function of said closing path at said intermediate position and over said second path section, said drive driving said closing unit over said first path section, over said second path section said closing unit (3) being substantially free of said driving torque and being driven substantially only by at least one kinetic mass force introduced over said first path section.
2 more elements
Dependencies are inferred from the claim text.