Paper Sheet Counting Device Turn Guide Plate Noise Reduction
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Solution Overview
Problem
Conventional paper sheet counting apparatuses experience noise and jamming issues during transport due to the contact of paper sheets with pinch rollers at turns, and are vulnerable to damage from thin and hard foreign articles like coins, which can also damage expensive recognition sensors.
Innovation Solution
The apparatus features a turn guide plate with a concave portion to reduce noise and edge damage, and a bent portion in the transport path upstream of sensors to prevent foreign articles from reaching the counting and recognition sensors, ensuring smooth transport and protecting sensitive equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the transport path includes a turn portion with level difference to change transport direction, then the paper sheets can be transported along a curved path, but the paper sheets contact the level difference causing running noise and potential edge damage
Solution Approach 1:
A guide plate is introduced as an intermediary component between the paper sheet and the turn portion structure. The guide plate has a specific shape that guides the paper sheet through the turn portion, preventing direct contact between the paper sheet edge and the level difference, thereby eliminating running noise and edge damage while maintaining high transport speed
Solution Approach 2:
The guide plate is designed to preliminarily guide the paper sheet into the correct trajectory before it reaches the turn portion. By pre-positioning and pre-orienting the paper sheet, the system prevents harmful contact at the critical moment when the paper sheet encounters the level difference
2Device complexity
If the transport path is compactly designed, then the apparatus size is reduced, but foreign articles like coins can reach the sensors causing damage
Solution Approach 1:
The transport path is segmented into distinct functional zones: a foreign article prevention zone with a bent portion upstream of the sensors, and a sensor detection zone. This segmentation allows the bent portion to intercept foreign articles like coins before they can reach the expensive recognition sensors, protecting them from damage while maintaining compact overall apparatus size
Data Source
AI summary
A paper sheet counting apparatus includes a hopper; a transport mechanism that feeds the paper sheets to a transport path one by one, and transports the paper sheets along the transport path; a sensing unit including a counting sensor for counting the paper sheets; and a stacker. The transport mechanism includes a drive roller constituting an inside of a turn portion for changing a direction of the transport path; pinch rollers that biases the paper sheet against the drive roller; and a turn guide plate arranged between the pinch rollers to guide the paper sheet along an outer periphery of the drive roller. The turn guide plate is formed such that a front edge of the paper sheet transported to the turn portion is guided to a contact portion between a pinch roller arranged on a downstream side and the drive roller.