A central threading positioning device

Abstract

The invention provides a positioning device for center threading. The positioning device for center threading comprises a first shaft and a second shaft, wherein the center position of the first shaft is provided with a first center threading hole, the first center threading hole penetrates through the first shaft along the radial direction of the first shaft, and one side of the first center threading hole is provided with a limiting portion; the second shaft comprises a main body portion and shaft portions which respectively and coaxially extend out from the end surfaces of the two sides of the main body portion, the center position of the main body portion of the second shaft is provided with a second center threading hole, the second center threading hole penetrates through the second shaft along the radial direction of the second shaft, and the main body portion is further provided with a holding through hole perpendicular to the second center threading hole; the first shaft penetrates through the holding through hole of the main body portion of the second shaft and is fixed through a fixing piece so as to fix the main body portion of the second shaft between the limiting portion and the fixing piece, the first shaft and the second shaft are perpendicular to each other and the geometrical centers of the first center threading hole and the second center threading hole are overlapped. The positioning device for center threading has the advantages of simple structure, low cost and good using effect, and can be widely applied to line lasers.

Description

technical field [0001] The invention relates to a center threading positioning device, in particular to a center threading positioning device applied in a laser marking instrument. Background technique [0002] Laser marking instrument is a precision instrument that can project laser cross horizontal lines and vertical lines on walls, floors and other substrates. It has a gravity pendulum pendulum, which can swing within a certain range relative to a fixed end. Under the action of gravity, the gravity pendulum pendulum will eventually reach a balance state in the direction of gravity. The laser line that the laser on the gravity pendulum pituitary emits just can keep in horizontal and vertical state. [0003] Since the laser installed on the pendulum of the gravity pendulum needs to be electrically connected with the control circuit fixed on the shell of the laser marking instrument through an electrical connection line, the electric connection line will give gravity Put a...

AI Technical Summary

Problems solved by technology

[0005] However, the structure of this product is very complicated, the manufacturing process is high, and the cost is high, which is not conducive to popularization and use.

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