Magnetic scale integrated with limit switch

Abstract

The invention discloses a magnetic scale integrated with a limit switch. The magnetic scale comprises a magnetic head, a magnetic scale body, a first Hall sensor, a second Hall sensor, a third Hall sensor and a fourth Hall sensor. Compared with prior art, the magnetic scale is advantageous in that along with magnetic head motion, when two sets of Hall sensors in the magnetic head are taken in or out of an effective sensing range above a magnetic track, a corresponding definite relation of a logic level which is output from the Hall sensors is realized. Therefore a motor driver can perform different corresponding functions according to different relations, thereby reducing the number of devices and the number of cables required for realizing a limiting function of a linear motion shaft on a worktable in motion in a positive direction and a negative direction, so that the number of device mounting steps of the worktable is reduced and wiring of the worktable is simplified. The magnetic scale can be cut to different dimensions and different lengths according to different actual requirement. Only a fact that the length of the magnetic scale is larger than the distance between the Hall sensors at two ends is required. Therefore the magnetic scale realizes high flexibility in use.

Description

technical field [0001] The invention relates to a mechanical and electronic accessory, in particular to a magnetic scale with an integrated limit switch. Background technique [0002] Limit switches, also known as travel switches, can be installed on relatively stationary objects (such as fixed frames, door frames, etc., referred to as still life) or moving objects (such as driving, doors, etc., referred to as animals). When the animal approaches the still object, the linkage of the switch actuates the contacts of the switch causing closed contacts to break or open contacts to close. The circuit and the motor are controlled by the change of the open and closed state of the switch contact. In the prior art, the application of the magnetic scale used is not flexible, or additional devices such as photoelectric sensors and magnets need to be installed on the workbench, and the photoelectric sensors also need to be installed with cables connected to the motor driver, which incr...

AI Technical Summary

Problems solved by technology

In the prior art, the application of the magnetic scale used is not flexible, or additional devices such as photoelectric sensors and magnets need to be installed on the workbench, and the photoelectric sensors also need to be installed with cables connected to the motor driver, which increases the wiring of the workbench. Therefore, room for improvement

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