Tape Feeder Link Velocity Control for Component Stability
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Solution Overview
Problem
Conventional carrier tape feeding methods in chip mounters cause impacts that lead to fine components being turned over or assuming wrong postures, resulting in low work efficiency due to constant velocity feeding and inadequate prevention by shutters, especially for small components.
Innovation Solution
A tape feeder with a link velocity control unit that varies the moving velocity of the pivot lever, reducing impacts by decelerating the carrier tape feeding through a mechanism involving a curved slot and elastic elements, ensuring stable component supply without increasing feeding time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If constant velocity tape feeding is used, then feeding speed is maintained, but impacts are generated causing components to be turned over or assume wrong postures
Solution Approach 1:
The patent applies dynamics by changing the feeding velocity from constant to variable. The velocity control unit dynamically adjusts the feeding speed based on the position of the carrier tape, reducing speed before and after the pickup point to minimize impacts on components while maintaining efficient feeding overall.
Solution Approach 2:
The patent changes the parameter of feeding velocity from a constant value to a variable value that depends on the carrier tape position. The velocity control unit modifies the feeding speed parameter dynamically, creating different velocity profiles at different stages of the feeding process to prevent component overturning.
2Reliability
If shutter is introduced to prevent component flipping, then component protection is improved, but minute components are still lifted and cause wrong postures
Solution Approach 1:
The patent applies preliminary action by controlling the velocity of the carrier tape feeding in advance. The velocity control unit reduces the feeding velocity before the pickup point, which prevents impacts from occurring in the first place, rather than relying on a shutter to correct problems after they occur.
3Reliability
If overall feeding speed is decelerated to prevent component overturning, then component stability is improved, but work efficiency is reduced
Solution Approach 1:
The patent applies dynamics by implementing variable velocity control rather than uniform deceleration. The feeding speed is reduced only at specific critical points (before and after the pickup point) while maintaining higher speeds during other phases, allowing the system to balance component stability with overall work efficiency.
Data Source
AI summary
Provided are a tape feeder for use in chip mounters that can reduce a chip feeding duration and prevent chips from being turned over or assuming wrong postures to feed the chips stably, and a chip mounting method. The tape feeder includes a second link having one end linked to a link shaft through which a first link and a pivot lever are combined and the other end in which a slot curved at a predetermined inclination is formed. The velocity at which a carrier tape is fed changes according to the inclination of the curve of the slot with respect to the moving direction of the first link, the curve contacting the contact unit upon the movement of the first link in a direction helping to rotate a ratchet gear.