US 6,601,513 B1Granted

Motor control method and apparatus, time recorder having same and impact type printing apparatus

AssigneeSeiko Precision Inc.

InventorKenji Ozawa

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Abstract

A motor control method and apparatus for stopping an object moved by a motor accurately at a predefined target position, shortening the time period required in stop control, in which the motor is driven at a first (high) speed up to a distance from the target position adequate for stop control and then is sequentially braked to a predetermined speed lower than the first speed, driven at a second (low) speed up to a distance from the target position equal to the stopping distance, and braked to a stop. The method and apparatus are used in a time recorder. An impact printing apparatus is also disclosed with printing pin actuation timing correction dependent upon scanning speed or platen shape, striking duration timing dependent upon scanning rate, or printing pin actuation timing dependent upon stored shift amounts.

Claims13

Dependent claims

A motor control apparatus for stopping an object moved by the motor at a predetermined target position, said motor control apparatus comprising:

motor controlling means for selectively driving the motor at a first desired speed and at a second desired speed lower than said first desired speed;
primary braking means for carrying out primary braking from said first desired speed to a predetermined speed slower than said first desired speed;
secondary braking means for carrying out secondary braking from said second desired speed to thereby stop the object, wherein the distance required to stop the object is a predetermined stopping distance;
and
a means for executing a controlled stop of the object within a predetermined stop control distance wherein the object, moving at said first desired speed is acted upon by said primary braking means and is successively moved by said motor at said second desired speed, and having reached said stopping distance from the end of said stop control distance, is acted upon by said secondary braking means;
wherein said means for executing a controlled stop acts upon said object moving toward the target position at said first desired speed at said stop control distance from the target position.

3 more elements

A time recorder comprising:

a motor for feeding a time card to a target position;
printing means to mark the card at said target position;
motor controlling means for selectively driving the motor at a first desired speed and at a second desired speed lower than said first desired speed;
primary braking means for carrying out primary braking from said first desired speed to a predetermined speed slower than said first desired speed;
secondary braking means for carrying out secondary braking from said second desired speed to thereby stop the time card, wherein the distance required to stop the time card is a predetermined stopping distance;
and
means for executing a controlled stop of the time card within a predetermined stop control distance wherein the time card, moving at said first desired speed is acted upon by said primary braking means and is successively moved by said motor at said second desired speed, and having reached said stopping distance from the end of said stop control distance, is acted upon by said secondary braking means;
wherein said means for executing a controlled stop acts upon said time card moving toward the target position at said first desired speed at said stop control distance from the target position.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/577,513Filed 24 May 2000
Priority: JP 11-14511225 May 1999
Granted: 5 Aug 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

B41J 11/42
Blanking or long feeds; Feeding to a particular line, e.g. by rotation of platen or feed roller: controlling printing material conveyance for…
B41J 13/12
Sheet holders, retainers , movable guides, or stationary guides: specially adapted for small cards, envelopes, or the like , e.g. credit cards,…
G07C 1/14
Wherein the time is indicated in figures: with apparatus adapted for use with individual cards
B41J
Typewriters