Apparatus for dispensing a predetermined volume of paste-like fluid
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United States of America Patent
Stats
-
Jul 18, 1989
Grant Date -
N/A
app pub date -
Jul 23, 1987
filing date -
Jul 31, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A piston driving device for dispensing a predetermined small amount of paste-like material from a nozzle in response to an electrical signal without any time-delay is enabled by the slow rotation of a ball-screw shaft, the rotation being reduced by a differential gear system. A female ball-nut fitted onto the ball-screw shaft causes a piston plunger to advance at very low speed such that dispensing of the predetermined volume of paste-like fluid is possible. Vertical motion of a nozzle is compensated by vertical motion of a piston driving device such that the relative position of a piston against a nozzle is unchanged.
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