Browse Prior Art Database

Rotational Locator

IP.com Disclosure Number: IPCOM000075170D
Original Publication Date: 1971-Aug-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Busacco, RA: AUTHOR

Abstract

Illustrated is a mechanical camming device 10 for rotating a square or rectangular workpiece, for example a semiconductor chip, through a desired angle, for example 45 degrees (See Fig. 1). The device includes a base 11 having a plurality of upstanding arms 12 equally spaced about the base. The inner surface 13 of each of the arms is inclined at an angle of 30 degrees from the vertical axis (see Fig. 3) and at an angle of 45 degrees in the horizontal plane. Preferably the inner surface 13 is cut on a slight arc as evident in Fig. 3, to aid in rotation of the workpiece. With a workpiece 14 held as by a vacuum probe, the workpiece is brought into contact with the arms (dashed line position, Fig. 1).

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Rotational Locator

Illustrated is a mechanical camming device 10 for rotating a square or rectangular workpiece, for example a semiconductor chip, through a desired angle, for example 45 degrees (See Fig. 1). The device includes a base 11 having a plurality of upstanding arms 12 equally spaced about the base. The inner surface 13 of each of the arms is inclined at an angle of 30 degrees from the vertical axis (see Fig. 3) and at an angle of 45 degrees in the horizontal plane. Preferably the inner surface 13 is cut on a slight arc as evident in Fig. 3, to aid in rotation of the workpiece. With a workpiece 14 held as by a vacuum probe, the workpiece is brought into contact with the arms (dashed line position, Fig. 1). As the probe advances downwardly, the surfaces 13 act as a cam effecting rotation of the workpiece through the desired angle until the workpiece is in the solid line position. Retraction of the probe then keeps the workpiece in the oriented position. To avoid damage to the workpiece, it is preferable that at least the arms of the device be composed of a material such as TEFLON*. * Trademark of E. I. du Pont de Nemours & Co.

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