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# Minimum Wear Track for a printer Cartridge

IP.com Disclosure Number: IPCOM000085640D
Original Publication Date: 1976-May-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 11K

IBM

## Related People

Lominac, HR: AUTHOR [+2]

## Abstract

The cartridge cam in a train printer is a semicircular or "horse shoe" type track, which is used to turn the carriers around and direct them back in the opposite direction. It is desirable to blend the curve between the straight section and the circular section in a smooth manner so that there are no discontinuities in the surface, its slope, or curvature.

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Minimum Wear Track for a printer Cartridge

The cartridge cam in a train printer is a semicircular or "horse shoe" type track, which is used to turn the carriers around and direct them back in the opposite direction. It is desirable to blend the curve between the straight section and the circular section in a smooth manner so that there are no discontinuities in the surface, its slope, or curvature.

The traditional method uses a polynomial equation in Cartesian coordinates which satisfies the boundary conditions. This leads to a curve with poor wear characteristics. However, if the angle of tangency to the curve is a polynomial equation with the arc length of the curve as the independent variable, then boundary conditions can be satisfied and good wear characteristics are achieved.

There are other restraints which also must be satisfied relating to the motion of the type carrier as it makes the turn. They involve the relative motions between the type carrier and the drive gear, platen, and other type carriers. Boundary conditions can be modified to optimize the motions being constrained.

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