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Variable Pitch Print Wheel

IP.com Disclosure Number: IPCOM000080945D
Original Publication Date: 1974-Mar-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Mulzet, AP: AUTHOR

Abstract

The print mechanism of Fig. 1 comprises a constantly rotating print wheel 10 and a print hammer 11. The print wheel 10 and hammer 11 are mounted on a reciprocating carrier, not shown, which traverses the print line at a constant linear velocity relative to print medium 16 and platen 17. The print wheel 10 comprises a type disk 12 and an interposer disk 13 concentrically mounted on a common rotating hub 14. The type disk 12 has plural spring-like fingers 15 with type characters formed on the surfaces, facing the print medium 16 and platen 17. The interposer disk 13 comprises a plurality of interposer spokes 18. The spacing of the interposer spokes 18 and the flexible type fingers 15 is such that one interposer spoke is in contact with a corresponding type finger at all times during the rotation.

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Variable Pitch Print Wheel

The print mechanism of Fig. 1 comprises a constantly rotating print wheel 10 and a print hammer 11. The print wheel 10 and hammer 11 are mounted on a reciprocating carrier, not shown, which traverses the print line at a constant linear velocity relative to print medium 16 and platen 17. The print wheel 10 comprises a type disk 12 and an interposer disk 13 concentrically mounted on a common rotating hub 14. The type disk 12 has plural spring-like fingers 15 with type characters formed on the surfaces, facing the print medium 16 and platen 17. The interposer disk 13 comprises a plurality of interposer spokes 18. The spacing of the interposer spokes 18 and the flexible type fingers 15 is such that one interposer spoke is in contact with a corresponding type finger at all times during the rotation.

The contact between the interposer spokes 18 and the type fingers 15 is preferably in the region in line with the characters on the face of the type finger. Printing occurs on-the-fly when the hammer 11 is actuated by electromagnet 19 in synchronism with the rotation of the type wheel 10, whereby the hammer 11 strikes an interposer spoke 18 to cause the shock energy delivered to the interposer spoke to deflect the selected type finger 15 outwardly to impact the print medium 16.

Since the print hammer 11 is rigidly mounted to the carrier, it will not necessarily be in direct alignment with the print position at all times during printing. The offset for printing of certain characters on the type wheel could produce overlapping of the hammer 11 and the adjacent type fingers 15, so that nipping of the adjacent characters could occur. The problem is avoided by stru...