Browse Prior Art Database

Vacuum Capstan

IP.com Disclosure Number: IPCOM000091815D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Related People

Golz, WR: AUTHOR

Abstract

This vacuum capstan moves a web media continuously or incrementally with minimum slippage. Through a selectable porting arrangement, the capstan can be set to handle a variety of web widths. Capstan 1 is rotatably mounted in close relationship to housing 2. Web 3 is guided by housing 2 into contact with 1 over a large part of its circumference. Annular sleeve valve 4 is rotatably mounted within 2 with selector knob 5 attached so as to seal one end. End cap 6 seals the other end of 2 with a vacuum being drawn through port 7, as indicated by the arrow, so as to evacuate the interior of 4. With 4 in the position shown, only port 8 is in communication with chamber 9. This, in turn, is in communication with the underside of 3 via circumferential grooves, such as 10, between shoulders 11 and 12.

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Vacuum Capstan

This vacuum capstan moves a web media continuously or incrementally with minimum slippage. Through a selectable porting arrangement, the capstan can be set to handle a variety of web widths. Capstan 1 is rotatably mounted in close relationship to housing 2. Web 3 is guided by housing 2 into contact with 1 over a large part of its circumference. Annular sleeve valve 4 is rotatably mounted within 2 with selector knob 5 attached so as to seal one end.

End cap 6 seals the other end of 2 with a vacuum being drawn through port 7, as indicated by the arrow, so as to evacuate the interior of
4. With 4 in the position shown, only port 8 is in communication with chamber 9. This, in turn, is in communication with the underside of 3 via circumferential grooves, such as 10, between shoulders 11 and 12. A high vacuum at 7, in conjunction with the large capstan-to-media interface, permits maximum gripping with minimum slippage.

To handle a web of a width equivalent to the spacing between shoulders 11 and knob 13, is be turned until port 14 communicates with 9 and port 15 communicates with chamber 16. Chambers 17, 18, and 19 remain isolated from the vacuum in 4 as shown. A web the width of the entire capstan can be handled by rotating 4 via 5 until chambers 9 and 16...19 are all in communication with the vacuum.

Capstan 20, with helically oriented circumferential grooves, can be used in place of capstan 1, as is also the case for capstan 21. The latter is closed a...