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Mechanical Coupling with Electrical Isolation

IP.com Disclosure Number: IPCOM000087289D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Duane, WJ: AUTHOR

Abstract

In a magnetic brush developer for use in a xerographic copier, it is necessary to provide rotational drive force to the magnetic brush roll and, at the same time, to isolate the roll's development electrode voltage from the metal drive chain.

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Mechanical Coupling with Electrical Isolation

In a magnetic brush developer for use in a xerographic copier, it is necessary to provide rotational drive force to the magnetic brush roll and, at the same time, to isolate the roll's development electrode voltage from the metal drive chain.

The mechanical coupling of Fig. 1 provides electrical isolation, and both circumferential and axial shifting of sprocket 11 on shaft 10 are prevented.

In Fig. 1, metal shaft 10 is fixed to the brush roll (not shown) such that shaft rotation produces roll rotation. Metal chain sprocket 11 includes a hub 12 having a key portion 13, shown in the end view of Fig. 2. A thin, deformable metal shim 14 is positioned in the roof of this key portion. A metal setscrew 15 is also located in the key portion.

As shown in Fig. 3, shaft 10 includes two flats 16 and 17, flat 17 being located in alignment with setscrew 15.

Proper rotational positioning of shaft 10 and sprocket 11 is achieved by plastic isolator 18. As seen in Fig. 2, this isolator includes a flat which mates with the shaft's flat 16, and a key portion 19 which mates with the sprocket's key portion 13.

Once the parts have been assembled, setscrew 15 operates to deform isolator 18 down into the shaft's flat 17.

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