Thermal expansion compensated hot knife
AssigneeGloucester Engineering Co., Inc.
InventorDaniel W. Woodman, Jr.
Life of this patent
Estimating the term…
Abstract
A heat sealing bar assembly is disclosed that is intended to avoid distortion of the heat sealing edge due to thermal expansion of the heated sealing bar with respect to the unheated support beam to which it is mounted. The mounting means include a fixed center support, end supports that permit axial sliding of the ends of the heated seal bar with respect to the support beam, and a series of jacking screws between the center support and the end support for adjusting the shape of the heated sealing bar.
Claims8
A thermal expansion compensated heat sealing apparatus comprising:
- a) a support beam including means for mounting said heat sealing apparatus to a means for reciprocating said heat sealing apparatus towards and away from a workpiece;
- b) a heated knife body for engagement with said workpiece;
- c) a fixed support assembly for connecting the heated knife body to the support beam at one point;
- d) an end support assembly adapted to permit sliding of the heated knife body parallel to the support beam while permitting rotation of the end of the knife body in a plane parallel to the plane of seal bar reciprocation;
- and
- e) one or more jacking bolts between the support beam and the hot knife body and located between the fixed support and the end support for forcing the hot knife body towards or away from the support beam.
In an apparatus for heat sealing and severing plastic film of the type including a shaped and heated sealing bar, a beam for supporting the sealing bar and for mounting the sealing bar to a mechanism that reciprocates said sealing bar towards and away from the plastic film to be heat sealed and severed, and means for connecting said heat sealing bar and said beam, an improved means for connecting comprising;
- a fixed support, an end support adapted to permit sliding of the heated sealing bar relative to the support beam and rotation of the sealing bar end in a plane parallel to the plane of reciprocation, and one or more jacking screws between said fixed support and said end support for adjusting the shape of said heated sealing bar.
Dependencies are inferred from the claim text.