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Commutated Vacuum Take Up Reel

IP.com Disclosure Number: IPCOM000094065D
Original Publication Date: 1966-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Nutter, SW: AUTHOR [+2]

Abstract

Take-up reel 17 is capable of being mounted on spindle 16 of a tape drive not shown. For clarity, reel 17 is shown as made of transparent plastic although it can be made of any material. Spindle 16 can contain expansion locking devices of the conventional type such as operated by screw knob 16A for expanding spindle 16 inside reel hub 20 to lock the reel 17 on it. Adjacent to the back of reel 17, mounted on spindle 16 against shoulder 16B, is plenum chamber 10. The latter is connected by tube 11 to vacuum source V not shown. Chamber 10 has a slotted opening 12 which surrounds shoulder 16B. The width of slot 12 is narrow, except over an angle N for an additional sector opening 13.

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Commutated Vacuum Take Up Reel

Take-up reel 17 is capable of being mounted on spindle 16 of a tape drive not shown. For clarity, reel 17 is shown as made of transparent plastic although it can be made of any material. Spindle 16 can contain expansion locking devices of the conventional type such as operated by screw knob 16A for expanding spindle 16 inside reel hub 20 to lock the reel 17 on it. Adjacent to the back of reel 17, mounted on spindle 16 against shoulder 16B, is plenum chamber
10. The latter is connected by tube 11 to vacuum source V not shown. Chamber 10 has a slotted opening 12 which surrounds shoulder 16B. The width of slot 12 is narrow, except over an angle N for an additional sector opening 13.

The 360 degrees of slot 12 are in continuous engagement with ports 27 through the back side of hub 20, when mounted. Sector 13 only cooperates with a part of ports 26 in hub 17 to commutate vacuum to connected slots 21 and 22. Ports 26 are arranged in a circular array with a greater diameter than the circular array of ports 27. This greater diameter for openings 26 causes them to communicate only with sector 13 and not with slot 12. Thus, the vacuum from chamber 10 is commutated only with respect to openings 26 as they momentarily align with sector 13 over the angle N during rotation of reel 17.

Sets of openings 23 in the hub surface connect in common to ports 27 through holes 24 formed axially within hub 20. Each hole 24 terminates without passing through the front side, i.e., flange 19, of reel 17. Hence, openings 23 uniformly provide vacuum over the entire hub surface. Slots 21 and 22, however, communicate only with ports 26 through holes 25 formed axially withi...