Ultrasonic welding and cutting apparatus
AssigneeBranson Ultrasonics Corporation
InventorsFrank J. Grgach, Everett A. Harris
Life of this patent
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Abstract
An ultrasonic welding and cutting apparatus designed for the manufacture of articles made of two superposed sheet materials includes an anvil means which exhibits a raised pattern of welding and cutting surfaces, and bearing surface means for limiting the motion of an ultrasonically vibrating horn toward the anvil means and for distributing also the impact forces manifest upon the anvil means. The horn is provided with means for reducing the motional excursion of the frontal surface portion which impacts upon the bearing surface means.
Claims18
In an ultrasonic welding and cutting apparatus for welding and cutting soft film and fabric material, the combination of:
- horn means adapted to be resonant at a predetermined frequency having an input surface for receiving vibratory energy of said frequency and an opposite frontal surface for transferring the received energy to material in contact with said frontal surface;
- electroacoustic means coupled to said horn means at its input surface for rendering said horn means resonant;
- anvil means disposed opposite said frontal surface for supporting the material for contact with said frontal surface to provide for energy transfer from said horn means to the material, said anvil means including a pattern of raised welding and cutting surfaces in the shape of an article to be produced, and raised bearing surface means for impact by said frontal surface, and
- said horn being constructed to exhibit substantially uniform motional excursion of said frontal surface in the direction toward said anvil at the region opposite said pattern of welding and cutting surfaces and including means for producing reduced motional excursion of said frontal surface at the region of impact with said bearing surface means.
A bar horn having an input surface and a lineal frontal surface, and adapted to be rendered resonant as a half wavelength resonator when driven at its input surface with vibratory energy of predetermined frequency, the improvement comprising:
- a plurality of apertures provided in said horn for causing, responsive to said horn being rendered resonant, a first portion of said lineal frontal surface to exhibit substantially uniform motional excursion and a second portion of said lineal frontal surface to exhibit reduced motional amplitude than that exhibited by said first portion.
Dependencies are inferred from the claim text.