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Page pack having novel heat sink arrangement for pump motor drive units

  • US 5,472,324 A
  • Filed: 06/10/1994
  • Issued: 12/05/1995
  • Est. Priority Date: 06/10/1994
  • Status: Expired due to Term
First Claim
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1. In combination, a unitary housing body for receiving a plurality of positive displacement ink pumps, including a plurality of substantially parallel bores lying in a first, common plane, each of said bores having a pump cylinder and at least one pump piston disposed therein, a plurality of individual drive motors, each of said motors being operatively associated with a pump, and arranged such that the respective rotational axes of all of said motors are substantially parallel to one another and lie in a given plane, with the plane of said motor axes intersecting but being slightly inclined with respect to the plane of said pump axes, said housing body also including at least one slotted end flange and an outwardly facing housing surface portion defining a circuitboard positioning area, an electronic control circuitboard positioned adjacent said housing, surface and having a margin received within and positioned by said slot, said circuitboard including at least one high current driver unit for each pump motor, with each driver unit including a packaged circuit secured to an individual metal heat sink in heat exchange relation, with each of said individual metal heat sinks lying in a common plane and said assembly further including a master metal heat sink with each of said individual heat sinks being secured to said master heat sink in intimate heat exchange relation therewith, and with said master heat sink bar also being secured to said housing flange in intimate heat exchange relation.

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