Spring-Loaded Backgauge Stop Finger With Switchable Locking
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Solution Overview
Problem
Existing back gauges for sheet-metal bending machines have limitations in safety and functionality, with automatic operation being restricted and magnetic locking devices being prone to unintentional release when contacting workpieces, leading to potential safety hazards and reduced functionality.
Innovation Solution
A back gauge system with a stop finger pre-loaded into its working position by a spring element and a switchable locking device, including an electromagnet, which allows for optional locking or release, ensuring safe operation and maintaining full functionality by adjusting the spring force and using a shape-fit or friction-fit connection for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic locking device is used to hold the stop finger in position, then the stop finger can be locked reliably, but the device may be released unintentionally when contacting sheet-metal workpieces
Solution Approach 1:
The patent changes the locking mechanism from magnetic to mechanical positive locking. The locking pin engages with locking holes in a positive mechanical connection, eliminating the unintentional release problem associated with magnetic devices while maintaining reliable locking through the mechanical engagement geometry.
Solution Approach 2:
The patent replaces the magnetic locking device with a purely mechanical locking system consisting of a locking pin, locking holes, and spring element. This substitution eliminates the electromagnetic field interactions that caused unintentional releases while achieving reliable locking through mechanical positive engagement.
2Ease of operation
If the stop finger is pre-loaded with a spring element into working position, then the stop finger returns automatically after displacement, but additional force is required to displace the stop finger
Solution Approach 1:
The patent implements dynamic operation by allowing the stop finger to move freely in the direction of the spring force without locking, while providing static locking in the opposite direction. The locking pin engages with locking holes only when force is applied in the locking direction, creating asymmetric dynamic behavior that facilitates easy return while enabling secure positioning.
3Reliability
If a locking pin with bore and guide rail is used, then the stop finger can be locked in position, but automatic operation is restricted
Solution Approach 1:
The patent creates a dynamic locking system where the locking pin can engage and disengage from locking holes based on the direction of applied force. The spring element automatically pushes the stop finger toward the locking position, and the locking pin engages only when force is applied in the locking direction, enabling automatic operation while maintaining positioning accuracy.
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
The system provides increased safety and full functionality by allowing the stop finger to return to its working position automatically and being locked or released as needed, with the electromagnet offering a reliable and low-maintenance solution, and the spring elements ensuring precise positioning and protection against force peaks.
Implementation Method 1
The stop finger is pre-loaded into its working position by means of a reset apparatus, in particular a first spring element
Implementation Method 2
the locking device comprises a holding part, in particular an electromagnet, wherein the stop finger can be locked in place relative to the base unit by means of application of activation energy in the holding part
Data Source
AI summary
A back gauge for a back gauge positioning system of a bending machine includes a stop finger on which at least one stop surface is configured, and a base unit that is configured for coupling with the back gauge positioning system. The stop finger is coupled with the base unit by a linear guide, and the stop finger can be displaced relative to the base unit between a pushed-forward working position and a retracted position. The stop finger and the base unit are coupled with a first spring element, by which the stop finger is pre-loaded into its working position, and a locking device is configured, by which the stop finger can optionally be locked in the working position or is released into its retracted position for displacement counter to the spring force of the first spring element.