Brakes – Internal-resistance motion retarder – Resistance alters relative to direction of thrust member
Patent
1974-11-22
1976-03-16
Burr, Edgar S.
Brakes
Internal-resistance motion retarder
Resistance alters relative to direction of thrust member
197183, 188297, 197 64, F16F 950
Patent
active
039440290
ABSTRACT:
A damper for line printers and the like in which the print head moves from left to right across a paper document during the printing phase and upon completion of a line of print, moves in the "carriage return" direction at a more rapid rate to return to the left-hand margin of the paper document preparatory to the printing of the next line of characters.
The damper is utilized to attenuate and cushion the impact of the print head as it approaches the left-hand margin of the paper document and comprises a stationary mounted cylinder and a cooperating print head mounted plunger having a rollably mounted O-ring. As the print head is moving rapidly in the "carriage return" direction, the plunger enters into the cylinder, causing the O-ring to frictionally engage the interior surface of the cylinder, whereupon the O-ring is caused to seal openings provided in the groove in which the O-ring is seated to create a "dash-pot" action for causing the air captured in the cylinder to be compressed and thereby dampening the impact of the rapidly moving print head as it is brought to a halt.
As the print head moves in the print direction, the O-ring is caused to roll away from the breather holes to facilitate rapid removal of the plunger from the cooperating cylinder.
REFERENCES:
patent: 2808144 (1957-10-01), Lambert et al.
patent: 2812533 (1957-11-01), Falk
patent: 2909263 (1959-10-01), Wheeler
patent: 2989299 (1961-06-01), Modrich
patent: 3358806 (1967-12-01), Krauss et al.
patent: 3861513 (1975-01-01), Riley
Burr Edgar S.
Centronics Data Computer Corporation
Coven Edward M.
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