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Inductive Sensor Detection of IHSA Bridge Clips

IP.com Disclosure Number: IPCOM000011936D
Publication Date: 2003-Mar-26
Document File: 3 page(s) / 60K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a new method of bridge clip detection that ensures that both sides of all clips are fully inserted into the product carrier. Benefits include a method that is much more durable in the production environment.

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Inductive Sensor Detection of IHSA Bridge Clips

Disclosed is a new method of bridge clip detection that ensures that both sides of all clips are fully inserted into the product carrier. Benefits include a method that is much more durable in the production environment.

Background

The current method uses a fiber optic emitter and receiver arrangement (see Figure 1). When the fiber optic is bent or damaged, it typically sends a “clip present” signal to the tool at all times. This lets clips that are partially inserted or not present to pass, and results in a rework condition or yield loss to the area. The key issues/problems related to the current clip detection system are as follows:

 

  • The current fiber optic sensors are easily damaged by lifter plate handling, and are easily bent. Once bent, they are costly to replace and difficult to calibrate.
  • The current fiber optic system has a limited range for detection of partially inserted bridge clips due to the pass/fail detection area.

General Description

The disclosed method uses an inductive sensor to detect absence or presence of clip insertion (see Figure 2). The inductive sensor issues a high or low signal, depending on the logic used, to notify the Spring Placement Machine to continue processing, or to flag the tool for a partial or no-insert condition.

Inductive sensing has a long and detailed history and is currently used in many and varied applications. The method detects clip presence or absence by using inductive coupl...