Tape Feeder Position Shift Detection for Component Mounting
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Solution Overview
Problem
In component mounting methods, erroneous suction occurs due to unstable tape feeding processes, leading to productivity losses as the suction nozzle may not correctly pick up components when the tape feeder's stop position is unstable, especially when the drive system and load mismatch or cover tape peeling affects the carrier tape's feeding.
Innovation Solution
Implement a method that includes imaging the tape position multiple times after a predetermined delay in the pitch feeding process to calculate the shift amount between initial and subsequent tape positions, determining if it's within an allowable range, and extending the delay time if necessary to ensure the tape feeder has stopped before component suction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tape feeder operates with a fixed delay time for component suction, then the mounting operation is simple and fast, but erroneous suction occurs when the tape feeding becomes unstable due to drive load mismatch or cover tape peeling
Solution Approach 1:
The patent applies preliminary action by performing multiple imagings of the tape position indicating portion before the actual component suction operation. The controller images the tape position at multiple time points (first imaging, second imaging, third imaging) in advance to detect position shifts caused by unstable tape feeding, and only proceeds to suction after confirming the tape has stabilized at the correct position. This preliminary detection prevents erroneous suction while maintaining efficient operation.
2Loss of time
If the suction nozzle lowers immediately after pitch feeding, then the mounting cycle is short, but the tape may not have stopped completely causing position shift and suction error
Solution Approach 1:
The patent implements feedback by continuously monitoring the tape position through multiple imagings and using this information to control the suction timing. The controller compares the tape position detected in successive imagings to determine when the tape has stabilized. Only when the position shift between imagings falls within a predetermined threshold does the controller proceed to lower the suction nozzle. This feedback mechanism ensures precise positioning while minimizing waiting time.
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 approach prevents erroneous suction by ensuring the tape feeder has stabilized, thereby maintaining productivity by ensuring accurate component pickup and mounting.
Implementation Method 1
a suction nozzle provided in a mounting head picks up a component, through vacuum suction, from a carrier tape
Data Source
AI summary
A component mounting method performs suction and holing, by a suction nozzle, of a component fed to a component picking-up position by a tape feeder which feeds by pitch a carrier tape having a pocket in which the component is accommodated, after a predetermined delay time elapses after a pitch feeding timing, and carries and mounts the component on a board. The component mounting method includes imaging a tape position indicating portion at separate two timings after the delay time elapses, and calculating a shift amount between a first and second tape positions respectively obtained at first and second timings of imaging. It is determined whether or not the shift amount calculated is within an allowable range, and when it is determined that the shift amount exceeds the allowable range, the delay time set for the tape feeder is extended or an error is notified.