Motor Deceleration Control for Sheet Recording Apparatus
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Solution Overview
Problem
Existing recording apparatuses struggle to maintain the target stop position of a sheet during conveyance, especially when sudden load variations occur, leading to deteriorated image quality due to periodic torque variations and inability to cope with load changes.
Innovation Solution
A recording apparatus with a control unit that adjusts the motor's deceleration profile by making the absolute value of deceleration smaller in specific conditions where the trailing edge of the sheet stops within predetermined regions, reducing the influence of load variations and maintaining accurate sheet positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor is accelerated and decelerated with a standard control profile, then the conveyance speed and productivity are improved, but the stop position accuracy deteriorates when the trailing edge of the sheet passes through the conveyance roller due to sudden load variation
Solution Approach 1:
The control unit dynamically adjusts the deceleration profile based on the position of the trailing edge. When the trailing edge is detected to be within a predetermined region of the conveyance roller, the control unit switches to a second deceleration profile with a smaller absolute deceleration value, preventing sudden load variations. This dynamic adaptation resolves the contradiction by maintaining both productivity through controlled deceleration and stop position accuracy by avoiding load-induced positioning errors.
Solution Approach 2:
The control unit uses feedback from the trailing edge position detection to adjust the motor control profile. By monitoring whether the trailing edge is within the predetermined region and switching between first and second deceleration controls accordingly, the system achieves accurate stop positioning while maintaining efficient conveyance speed, resolving the contradiction between productivity and manufacturing precision.
2Device complexity
If a standard deceleration control is applied, then the conveyance operation is simple and device complexity is reduced, but the image quality deteriorates due to stop position deviation caused by periodic torque variation and sudden load changes
Solution Approach 1:
The control system dynamically switches between two deceleration profiles based on trailing edge position feedback. This dynamic approach maintains image quality by preventing stop position deviations during critical phases while keeping the control logic relatively simple through conditional switching, thus resolving the contradiction between device complexity and manufacturing precision.
Solution Approach 2:
The control unit changes the deceleration parameter (acceleration value) based on the trailing edge position. By switching between a first deceleration profile (larger absolute deceleration) and a second deceleration profile (smaller absolute deceleration), the system maintains accurate stop positioning for image quality while avoiding excessive complexity in the control system.
3Productivity
If the absolute value of deceleration is increased to reduce conveyance time, then the productivity is improved, but the stop position accuracy worsens due to increased influence of sudden load variation
Solution Approach 1:
The control unit dynamically adjusts deceleration magnitude based on trailing edge position. During critical phases when the trailing edge is within the predetermined region, a smaller absolute deceleration is applied to maintain stop position accuracy. During non-critical phases, a larger absolute deceleration can be used to reduce conveyance time and improve productivity, thus resolving the contradiction between these two parameters.
Solution Approach 2:
The deceleration parameter is changed based on the trailing edge position feedback. The control unit selects between a first deceleration profile (larger absolute value for faster stopping) and a second deceleration profile (smaller absolute value for more accurate positioning), optimizing both productivity and manufacturing precision by adapting the parameter to the operational context.
Data Source
AI summary
A recording apparatus includes a recording unit configured to record an image onto a sheet, a first conveyance roller configured to convey the sheet, a motor configured to drive the first conveyance roller, and a control unit configured to repetitively perform control for accelerating the motor in an acceleration period and then decelerating the motor in a deceleration period, wherein, in at least a part of the deceleration period, the control unit makes an absolute value of a second deceleration in a second control of the motor smaller than an absolute value of a first deceleration in a first control of the motor, the first control being performed in a case where a trailing edge of the sheet does not stop in a first predetermined region, the second control being performed in a case where the trailing edge of the sheet stops in the first predetermined region.