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# Angular Velocity Contorl for Flapper

IP.com Disclosure Number: IPCOM000014807D
Original Publication Date: 1999-Oct-01
Included in the Prior Art Database: 2003-Jun-20
Document File: 3 page(s) / 34K

IBM

## Related People

Hiroyuki Takenoshita: AUTHOR [+2]

## Abstract

A program is disclosed that acoustic noise reduction method for the flapper, which closes an opening of a feed p printer. (Figure of the flapper construction) Usually, the flapper is moved by any electrical active device. If it is moved by a solenoid, it makes acoustic n of a collision of a flapper and a bar back. The noise will be decrease, if the flapper hits the bar back in slo However, the angular velocity must fast to make a quick flapper action. This method controls the angular velocity changing the duty ratio of the drive current supplied to the solenoid. If the flapper needs 500msec for its total action, the current duty ratio will change each 100msec like this tab In the first half, the flapper moves quickly. Then, when the flapper reaches the bar back, it closes without any because the angle velocity is slow. Interval Duty ratio Angular velocity

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Angular Velocity Contorl for Flapper

A program is disclosed that acoustic noise reduction method for the flapper, which closes an opening of a feed p
printer.
(Figure of the flapper construction)

Usually, the flapper is moved by any electrical active device. If it is moved by a solenoid, it makes acoustic n
of a collision of a flapper and a bar back. The noise will be decrease, if the flapper hits the bar back in slo
However, the angular velocity must fast to make a quick flapper action.

This method controls the angular velocity changing the duty ratio of the drive current supplied to the solenoid.
If the flapper needs 500msec for its total action, the current duty ratio will change each 100msec like this tab
In the first half, the flapper moves quickly. Then, when the flapper reaches the bar back, it closes without any
because the angle velocity is slow.

+-------------+------------+------------------+

| Interval | Duty ratio | Angular velocity |
+-------------+------------+------------------+

| 0-100msec | 90% | Fast take off |
| 100-200msec | 70% | Speed up |

| 200-300msec | 50% | Constant fright |
| 300-400msec | 20% | Slow down |
| 400-500msec | 10% | Soft landing |
| 500msec- | 40% | Keep hold |
+-------------+------------+------------------+

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