WORKpiece CONVEYING APPARATUS AND ADJUSTMENT METHOD IN WORKpiece CONVEYING APPARATUS

Abstract

The present invention provides a workpiece conveying apparatus and a method of adjusting the same that the required design precision and adjustment precision are relaxed to such an extent that the workpiece conveyance is not hindered. The workpiece conveying apparatus includes a conveying unit (31, 41) having transport surfaces (331, 431, and 441) for conveying the workpiece in a state in which the workpiece is placed and a traveling wave generating unit that causes at least the traveling surfaces (331, 431, 441) to generate traveling waves. The traveling wave ratio is 0.13 or more. The traveling wave ratio is defined as the ratio of the minimum amplitude to the maximum amplitude of the position where the vibration is greatest within the predetermined range, wherein the minimum amplitude is the amplitude of the position where the conveying surface (331, 431, 441) vibrates the smallest within a predetermined range among the vertical amplitudes of the conveying surfaces (331, 431, 441) caused by the traveling wave.

Description

technical field [0001] The present invention relates to a workpiece conveying device that conveys a workpiece by generating traveling waves on a conveying surface, and an adjustment method of the workpiece conveying device. Background technique [0002] As a conventional workpiece conveyance device, it is described in Patent Document 1, for example. According to the principle described in Patent Document 1, such a workpiece conveying device uses a piezoelectric body to bend a conveying surface in contact with a workpiece to generate a traveling wave. This traveling wave generates an elliptical motion at each position on the conveying surface, and the workpiece placed on the conveying surface is conveyed in a direction opposite to the traveling direction of the traveling wave along with the elliptical motion. [0003] In this workpiece conveyance device, for example, a plurality of piezoelectric bodies belonging to two groups arranged at substantially symmetrical positions i...

AI Technical Summary

Problems solved by technology

However, the conveying surface cannot be made into a complete (ideal) symmetrical shape, and the position of the piezoelectric body relative to the conveying surface and the driving state of each piezoelectric body are also different, so it is impossible to produce a perfect traveling wave, and in fact, a cycle occurs. There are traveling waves with different amplitudes (divided in size) at different positions in the direction, so the conveying speed of the workpiece is inconsistent at different positions on the conveying surface

Here, when the difference in amplitude at different positions in the circulation direction is large, it may be difficult for the workpiece to move or stop locally, thereby hindering the smooth conveyance of the workpiece by the conveying surface.

However, it is very difficult to design and adjust the workpiece conveying device with high precision so as to generate a perfect traveling wave with the same amplitude at different positions in the circulation direction.

Images