Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Magnetic Compensation and Cooling Technique for a Stores Energy Print Actuator

IP.com Disclosure Number: IPCOM000053084D
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 3 page(s) / 101K

Publishing Venue

IBM

Related People

Hanna, DW: AUTHOR [+2]

Abstract

A print actuator comprises a hammer block 10 with strip permanent magnet 11 and 12 mounted on the ends of pole pieces 13 and 14. Slots 15 and 16 are formed in the pole pieces 14 and 13, respectively, providing air passageways for forced air cooling of the assembly. The end section 18 is made wider than the inner sections of the pole pieces in order to compensate and offset the magnetic leakage at the end positions. The end position tooth 17 of focusing plate 22 may also be made wider than the teeth 19 to aid in this compensation. With this compensation, the spring hammer element at the end positions of each actuator block 10 is retracted and held with the same amount of force as the central hammer elements 24, resulting in identical impact forces.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 64% of the total text.

Page 1 of 3

Magnetic Compensation and Cooling Technique for a Stores Energy Print Actuator

A print actuator comprises a hammer block 10 with strip permanent magnet 11 and 12 mounted on the ends of pole pieces 13 and 14. Slots 15 and 16 are formed in the pole pieces 14 and 13, respectively, providing air passageways for forced air cooling of the assembly. The end section 18 is made wider than the inner sections of the pole pieces in order to compensate and offset the magnetic leakage at the end positions. The end position tooth 17 of focusing plate 22 may also be made wider than the teeth 19 to aid in this compensation. With this compensation, the spring hammer element at the end positions of each actuator block 10 is retracted and held with the same amount of force as the central hammer elements 24, resulting in identical impact forces.

To accomplish cooling, forced air via an external manifold, for example, is provided on one side of block 10 in alignment with the holes 20, and flows from these holes and through slots 15 and 16. An L-shaped air shield 21 diverts the air from holes 20 through slots 15. Shield 21 has end plates (not shown) to prevent air from leaking out the ends of the hammer blocks. In passing through slots 15 the air is directed at the coils mounted on center poles 23 and then through slots
16. Some air which is directed at the coils 22 passes through them and exits the block between the hammer beams 26 which are normally held against the center poles 23 b...