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Magnetic Ink Level Sensing Device

IP.com Disclosure Number: IPCOM000097671D
Original Publication Date: 1961-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Henkel, MA: AUTHOR

Abstract

The supply of magnetic ink particles in a hopper 10 for use in magnetic printing is controlled by an electromagnetic sensing device 11. Its operation is controlled by the presence of magnetic particles in 10. The sensing element comprises a hollow coil 12 having its axis disposed vertically within 10. The magnetic particles pass through 12 and assume the same level as the other particles in 10. Coil 12 is supported by a pair of flat plates 13 and 14 of electrical iron. Plates 13 and 14 have openings 13a and 14a coaxially aligned with those of coil 12. The plates extend through the wall of 10 to externally support and operate an armature 15.

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Magnetic Ink Level Sensing Device

The supply of magnetic ink particles in a hopper 10 for use in magnetic printing is controlled by an electromagnetic sensing device 11. Its operation is controlled by the presence of magnetic particles in 10. The sensing element comprises a hollow coil 12 having its axis disposed vertically within 10. The magnetic particles pass through 12 and assume the same level as the other particles in 10. Coil 12 is supported by a pair of flat plates 13 and 14 of electrical iron. Plates 13 and 14 have openings 13a and 14a coaxially aligned with those of coil 12. The plates extend through the wall of 10 to externally support and operate an armature 15.

Armature 15 operates contacts 16 and 17. Leads 18, 19 and 20 connect feed motor 21 in parallel with sensing coil 12. A timer switch 22 is provided in series with 12 and a power source. Timer 22 periodically energizes coil 12 to determine the particle level in 10.

With timer 22 closed, when the supply of particles is below 12, armature 15 closes the circuit causing motor 21 to operate to deliver particles by a conveyor to fill 10. Although 12 is energized, there is insufficient magnetic force on 15 to overcome the bias of spring 23. When the supply of particles in 10 reaches a predetermined level so that particles are within 12, armature 15 is attracted and opens the circuit to motor 21. Timer 22 then operates to open the circuit to coil 12 to permit particles in 12 to exit as the supply of par...