Sensor-Monitored Vacuum Chuck for Wood Machining
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Solution Overview
Problem
Current woodworking machines lack the ability to automatically detect and monitor the type, position, and operating state of vacuum blocks, relying on manual placement and optical markings, which is inefficient and prone to errors.
Innovation Solution
Integration of a receiver rail with a light receiver and evaluation unit on the clamping bridges, along with sensors and communication modules in the vacuum blocks, allowing for optical and radio signal transmission to confirm correct positioning and report operational status, enabling continuous monitoring and feedback to the machine tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual placement of vacuum blocks on clamping bridges is used with optical markings, then setup simplicity is maintained, but positioning accuracy and monitoring capability deteriorate
Solution Approach 1:
The patent replaces manual visual positioning with an optical detection system. The light receiver and evaluation unit automatically detect the position of vacuum blocks by receiving optical signals (e.g., reflected light from markers or LEDs on the vacuum blocks), substituting the mechanical/manual positioning process with an optical measurement system that provides precise, automated position detection without requiring complex mechanical positioning mechanisms
Solution Approach 2:
The patent uses optical markers or light-emitting elements on vacuum blocks that create optical copies or representations of their position. The light receiver detects these optical signals to determine block positions, effectively using light as a carrier of positional information rather than direct mechanical measurement
2Reliability
If no monitoring system is implemented, then device complexity is low, but operational reliability and error detection capability deteriorate
Solution Approach 1:
The patent implements a feedback system where the light receiver continuously monitors the position and presence of vacuum blocks on clamping bridges. The evaluation unit processes this information and can provide feedback signals to the control system, enabling automatic detection of misplaced or missing blocks, and allowing the system to respond appropriately (e.g., preventing operation until correct placement is achieved), thereby improving operational reliability through continuous monitoring
Solution Approach 2:
The monitoring system enables the machine to self-check the correct placement of vacuum blocks without requiring manual verification. The optical detection system automatically identifies whether blocks are present and correctly positioned, allowing the system to self-validate its setup state and prevent operation under incorrect conditions
3Productivity
If automated detection systems are added to vacuum blocks, then productivity and monitoring efficiency are improved, but device complexity and manufacturing cost deteriorate
Solution Approach 1:
The patent segments the detection functionality into separate components: simple optical markers or light-emitting elements attached to or integrated into vacuum blocks, and the complex evaluation logic housed in the machine's control system. This segmentation allows the vacuum blocks themselves to remain relatively simple while the monitoring intelligence resides in the central system, reducing manufacturing complexity of individual blocks
Solution Approach 2:
The optical detection system serves multiple functions: it detects the presence of vacuum blocks, verifies their correct positioning, and can potentially identify specific block types. A single optical infrastructure (light sources, receivers, and evaluation unit) performs what would otherwise require multiple separate sensing systems, improving productivity without proportionally increasing complexity
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 ensures accurate and efficient placement of vacuum blocks, enhances operational reliability, and allows for real-time monitoring of their status, reducing manual errors and improving overall machine performance.
Implementation Method 1
a receiver rail with a downstream light receiver along its usable length... The light receiver has an evaluation unit or an evaluation unit is connected downstream of the light receiver, which converts the received signals into a useful signal sequence
Implementation Method 2
at least one transmission light source whose light outlet on the vacuum block side—for coupling in the emitted light signals—is arranged at a short distance from the receiver rail
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A workpiece clamping table of a wood machining tool (10) comprises vacuum chucks (70) that are located on clamping bridges (20) and are used for urging workpieces into a clamped state using negative pressure; in order to set up the workpiece clamping table (11), the individual vacuum chuck (70) can be manually placed on a clamping bridge (20) in a position optically marked by at least one luminous emitting light source (61) of a strip (60) of lights; the workpiece clamping table is characterized in that: - along the operating length, the individual clamping bridge (20) includes, in addition to the strip of light (60) consisting of individual emitting light sources (61), a receiver rail (41) with a downstream light receiver (42); - the light receiver (42) includes an evaluation unit, or an evaluation unit is mounted downstream of the light receiver (42), and said evaluation unit converts the received signals into a sequence of useful signals that can be read by the wood machining tool; - the individual vacuum chuck (70) includes at least one energy source (100), at least one pressure sensor (110) on the side facing the workpiece and/or at least one pressure sensor (111) on the side facing the clamping bridge, at least one identification component (121) and at least one computing unit (122) for implementing serial or parallel signal transmission for displaying the operating state using optical or acoustic means and/or for communicating with the machine tool (10); - the individual vacuum chuck (70) and the wood machining tool (10) each have at least one transmitter and at least one receiver for the transmission of information using optical signals and/or radio signals; - the vacuum chuck (70) includes at least one optical signal receiver (65) which can recognize the optically marked position (135) of the vacuum chuck (70) once the latter has been placed on the clamping bridge (20); and - the vacuum chuck (70) includes at least one emitting light source (47), the light emergence point (48) — for injecting emitted light signals — of which is located at a short distance from the receiver rail (41).