RECORDING POSITION CONTROL DEVICE AND ABNORMALITY DETECTING METHOD FOR SAME
First Claim
1. A recording position control device, comprising:
- a plurality of head units arranged in a conveyance direction of a recording medium, to discharge ink droplets on to the recording medium to form an image on the recording medium;
a plurality of edge sensors to detect a meandering amount of the conveyed recording medium in conveyance;
a plurality of head movers mounted on the head units, respectively, to finely move the head units in a main scanning direction;
a controller to perform an original-point determination operation of moving the head units to an original point, which is a reference position of the head units, and to control the head movers to move the head units in a direction to correct meandering of the recording medium, according to the meandering amount detected based on outputs of the edge sensors; and
a timer to measure a time period from when the controller outputs an execution command of a movement to the head movers to when the controller receives from the head movers a completion status indicating that the movement is completed,wherein the controller performs a second round of the original-point determination operation after performing a first round of the original-point determination operation,wherein the timer measures, as a measurement time period, a time period from when the controller issues an execution command of the second round of the original-point determination operation to when the controller receives a completion status of the second round of the original-point determination operation, andwherein in a case in which the measurement time period is equal to or shorter than a first threshold time period, the controller determines that the original-point determination operation of the head units has failed to be normally executed.
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Accused Products
Abstract
A recording position control device includes head units, edge sensors, head movers, a controller, and a timer. The controller performs an original-point determination operation of moving the head units to an original point and to control the head movers to move the head units in a direction to correct meandering of a recording medium. The controller performs a second round of the original-point determination operation after performing a first round of the original-point determination operation. The timer measures, as a measurement time period, a time period from when the controller issues an execution command of the second round to when the controller receives a completion status of the second round. In a case in which the measurement time period is equal to or shorter than a first threshold time period, the controller determines that the original-point determination operation of the head units has failed to be normally executed.
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Citations
6 Claims
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1. A recording position control device, comprising:
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a plurality of head units arranged in a conveyance direction of a recording medium, to discharge ink droplets on to the recording medium to form an image on the recording medium; a plurality of edge sensors to detect a meandering amount of the conveyed recording medium in conveyance; a plurality of head movers mounted on the head units, respectively, to finely move the head units in a main scanning direction; a controller to perform an original-point determination operation of moving the head units to an original point, which is a reference position of the head units, and to control the head movers to move the head units in a direction to correct meandering of the recording medium, according to the meandering amount detected based on outputs of the edge sensors; and a timer to measure a time period from when the controller outputs an execution command of a movement to the head movers to when the controller receives from the head movers a completion status indicating that the movement is completed, wherein the controller performs a second round of the original-point determination operation after performing a first round of the original-point determination operation, wherein the timer measures, as a measurement time period, a time period from when the controller issues an execution command of the second round of the original-point determination operation to when the controller receives a completion status of the second round of the original-point determination operation, and wherein in a case in which the measurement time period is equal to or shorter than a first threshold time period, the controller determines that the original-point determination operation of the head units has failed to be normally executed. - View Dependent Claims (2, 3, 4, 5)
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6. An abnormality detecting method, comprising:
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performing once an original-point determination operation of moving a head unit to an original point, which is a reference position of the head unit; performing a second round of the original-point determination operation after performing a first round of the original-point determination operation; measuring, with a timer, a time period from when an issuance of an execution command of the second round of the original-point determination operation to a receipt of a completion status of the second round of the original-point determination operation, as a measurement time period; and determining that the original-point determination operation of the head unit has failed to be normally executed, in a case in which the measurement time period is equal to or shorter than a threshold time period.
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Specification