Ball-throwing device with ball throwing heads and ball conveying system including Y-junction
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United States of America Patent
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Dec 24, 1985
Grant Date -
N/A
app pub date -
Apr 19, 1983
filing date -
May 12, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Balls such as table tennis balls or tennis balls are continuously fed to two pairs of adjacent flanged rollers of a ball-throwing head by a blower and two transfer ducts. Balls hit by the player are collected by a net and a trough, then fed back to the head. The rollers have separately variable speeds of rotation, a gap being provided between each pair of rollers and adapted to the diameter of the balls. The balls are directed alternately into each transfer duct, the opening of which is located opposite to each gap.
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