Circulating Sheet Sensor for Printing Machine Position Monitoring
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Solution Overview
Problem
Existing sheet conveying systems in printing machines face limitations in continuously monitoring the position of sheets relative to guide elements over a large time period due to the restricted availability of measured values within a small rotational angle range of cylinders or drums.
Innovation Solution
A circulating conveyor element with grippers, a position-setting device, and a wireless measuring configuration using light or ultrasound sensors to continuously monitor the sheet's position relative to guide elements, allowing for distance measurement and position adjustment independently of conveying speed, with sensors arranged on the conveyor element or drum to provide three-dimensional position and inclination detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a stationary sheet sensor is used to detect sheet position, then the device complexity is reduced, but the measurement precision and reliability deteriorate because measured values are available only within a small rotational angle range
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a stationary sensor to a sensor system that moves with the conveyor element. The sensor is now part of the circulating conveyor system, allowing it to continuously track the sheet throughout its entire path around the drum, thereby extending the measurement range from a small angular sector to the complete 360-degree circulation path.
Solution Approach 2:
The patent implements another dimension by adding the temporal dimension to the measurement process. Instead of taking measurements at fixed spatial points, the moving sensor continuously measures sheet position over time as it circulates with the conveyor, enabling continuous monitoring throughout the entire sheet conveyance cycle rather than at discrete angular positions.
2Reliability
If sensors are arranged on the circulating conveyor element to enable continuous monitoring, then the measurement precision and reliability improve, but the device complexity increases
Solution Approach 1:
The patent applies merging by integrating the sensor system with the existing circulating conveyor element. Rather than adding a separate stationary sensing system, the measurement function is combined with the conveyor's moving components, allowing the same structural elements to serve both transport and measurement functions simultaneously.
Solution Approach 2:
The patent implements universality by designing the measuring configuration to serve multiple functions: it not only detects sheet position but also operates independently of conveying speed variations and can detect three-dimensional position and inclination. This multi-functional sensor system replaces what would otherwise require multiple separate sensing arrangements.
3Duration of action of moving object
If the measuring configuration moves with the conveyor element, then the duration of action for sheet position monitoring is extended over a large time period, but the use of energy increases due to wireless signal transmission
Solution Approach 1:
The patent applies feedback by implementing a closed-loop communication system where the moving sensor continuously transmits position data wirelessly to a stationary control unit, which then processes the information and can send control signals back to adjust gripper position or conveyor operation, creating an efficient feedback mechanism that optimizes energy usage.
Solution Approach 2:
The patent replaces mechanical connections with wireless signal transmission. Instead of using physical wires or mechanical linkages to transmit sensor data from the moving conveyor element to the control system, electromagnetic signals are used, eliminating the need for sliding contacts or complex mechanical data transmission mechanisms.
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
Enables continuous and reliable monitoring of the sheet's position over a large time period, ensuring accurate positioning and preventing sheet misalignment or contact with guide plates, even at varying speeds, through wireless signal transmission to a stationary control unit.
Implementation Method 1
a light source disposed to direct light beams onto the sheet, and a light receiver for receiving light beams reflected from the sheet
Implementation Method 2
an ultrasound source disposed to direct ultrasound waves onto the sheet, and an ultrasound receiver for receiving ultrasound waves reflected from the sheet
Data Source
AI summary
An apparatus for conveying sheets through a printing machine allows continuous monitoring of the position of a sheet with regard to a guide element over a long time period. There is provided a circulating conveyor element with grippers in which the sheet is held at a leading edge. A device for setting the position of the sheet can adjust the position with regard to a desired position. A measuring configuration measures the position and the presence of the sheet. A control device is connected to the device for setting the position and to the measuring configuration. The measuring configuration is mounted so as to circulate with the conveyor element.