Single-Motor Roller Drive with Brake for Multi-Feed Prevention
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Solution Overview
Problem
Existing medium conveying devices face challenges in controlling the rotation of multiple rollers with different purposes using a single motor, leading to inefficient power consumption and difficulty in separating and conveying various types of media, such as paper and plastic cards, without causing multi-feed errors.
Innovation Solution
A medium conveying apparatus that includes a brake roller, a pair of conveyance rollers, and a single motor with a driving force transmission mechanism, where the motor rotates forward to convey separated media and backward to prevent multi-feed, allowing for precise control of roller rotation in both separation and non-separation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple rollers are rotated by a single motor, then power consumption is reduced, but it becomes difficult to appropriately control the rotation of rollers with different purposes
Solution Approach 1:
The patent segments the control of roller rotation by introducing a brake mechanism that can independently control each roller's rotation state. The brake roller can be selectively engaged or disengaged from the drive belt, allowing individual rollers to be controlled despite being driven by a single motor. This enables the brake roller to remain stationary while conveyance rollers rotate, or vice versa, resolving the control difficulty while maintaining single-motor operation.
2Device complexity
If the brake roller and conveyance rollers are driven by the same motor, then device complexity is reduced, but it is not easy to prevent multi-feed errors during medium conveyance
Solution Approach 1:
The patent applies preliminary action by engaging the brake mechanism on the brake roller before the medium reaches the conveyance rollers. The brake is activated in advance to prevent the brake roller from rotating during the conveyance phase, ensuring that only one medium is fed at a time. This preliminary braking action prevents multi-feed errors while maintaining the simple single-motor drive system.
3Ease of operation
If all rollers rotate simultaneously, then the mechanism is simpler to operate, but it causes multi-feed errors when conveying multiple sheets
Solution Approach 1:
The patent introduces dynamic control of roller rotation through the brake mechanism. The brake roller's rotation state can be dynamically changed between engaged (stationary) and disengaged (rotating) states based on the conveyance phase. During separation mode, the brake is engaged to prevent rotation; during conveyance mode, the brake is disengaged to allow rotation. This dynamic control prevents multi-feed errors while maintaining operational simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables efficient and precise control of roller rotation with a single motor, reducing power consumption and preventing multi-feed errors, effectively conveying a range of media types, including thick documents like plastic cards, while maintaining appropriate spacing between sheets.
Implementation Method 1
a first motor 151, a driving force transmitting mechanism to transmit a driving force from the first motor 151 to the brake roller 113 and the pair of conveyance rollers 115, 116
Implementation Method 2
a brake roller 113...rotating the first motor backward to perform a feed operation by the brake roller 113
Implementation Method 3
a pair of conveyance rollers located on the downstream side of the brake roller in a medium conveying direction
Data Source
AI summary
A medium conveying apparatus includes a driving force transmitting mechanism to transmit a driving force from a first motor to a brake roller and a pair of conveyance rollers located on the downstream side of the brake roller, and a processor to rotate the first motor forward to control so that a medium separated by the brake roller is conveyed by the pair of conveyance rollers, in a separation mode. The processor rotates the first motor backward to perform a feed operation by the brake roller and rotate the pair of conveyance rollers backward until a front edge of the medium passes through a position of the brake roller, and rotates the first motor forward to control so that the medium is conveyed by the pair of conveyance rollers after the front edge of the medium passes through the position of the brake roller, in a non-separation mode.