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Velocity Control for Ink Jet Recorder

IP.com Disclosure Number: IPCOM000081588D
Original Publication Date: 1974-Jul-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Helinski, EF: AUTHOR [+2]

Abstract

Pump 10 supplies ink under pressure to a nozzle and droplet generator 11 to produce a stream of ink droplets 12 which pass through a deflector system 13, which selectively directs drops to either a print medium 14 to record information such as characters or to a droplet gutter 15. The gutter is provided with a cantilever beam 16 mounted at one end to a gutter block 17, with the opposite end located in position to be impinged by deflected drops 18. Ink on cantilever beam 16 runs off the bottom edge into a well 19 formed in the gutter block 17. The ink in well 19 is returned to an ink reservoir through pipe 20.

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Velocity Control for Ink Jet Recorder

Pump 10 supplies ink under pressure to a nozzle and droplet generator 11 to produce a stream of ink droplets 12 which pass through a deflector system 13, which selectively directs drops to either a print medium 14 to record information such as characters or to a droplet gutter 15. The gutter is provided with a cantilever beam 16 mounted at one end to a gutter block 17, with the opposite end located in position to be impinged by deflected drops 18. Ink on cantilever beam 16 runs off the bottom edge into a well 19 formed in the gutter block 17. The ink in well 19 is returned to an ink reservoir through pipe 20.

The momentum of the impinging drops 18 causes beam 16 to deflect. The degree of deflection is sensed by strain gauges 21 - 24 mounted in pairs on opposite sides of the cantilever beam 16. Strain gauges 21 - 24 are electrically connected in a bridge configuration, as shown in the dotted line block 25, in which the gauges 21 and 22 are the front strain gauges and 23, 24 are the back strain gauges, as seen in Figs. 1 and 3. The deflection of beam 16 by discard drops 18 unbalances bridge 25 and produces a voltage output which is proportional to the deflection.

The bridge output voltage is applied from amplifier 26 to a differential amplifier 27. A correction voltage is applied from differential amplifier 27 through power amplifier 28 to pump 10, if the bridge voltage from amplifier 26 is not equal to a set voltage representi...