Patent ID: 7891929
Filing Date: 2011-02-22
Classification: B65G,Y10S

Abstract:
1. A conveying vehicle system, comprising: a plurality of facilities, each of the facilities having at least one load port; a first traveling rail arranged along the plurality of facilities; a first overhead traveling vehicle that runs along the first traveling rail and conveys articles between the plurality of facilities, the first overhead traveling vehicle including an elevating and lowering driving section configured to elevate and lower a platform; a second traveling rail locally provided near the plurality of facilities and closer to the plurality of facilities than the first traveling rail, the load ports of the plurality of facilities being located immediately below a portion of the second traveling rail; a buffer locally provided near the plurality of facilities, the buffer being provided immediately below a portion of the first traveling rail and parallel to the second traveling rail, the buffer including a plurality of storage locations to store articles placed on the buffer by the first overhead traveling vehicle, wherein successive storage locations of the plurality of storage locations abut each other and extend in a horizontal direction along the first traveling rail, a second overhead traveling vehicle that runs in a horizontal direction along the second traveling rail, the second overhead traveling vehicle including a platform, an elevating and lowering driving section that elevates and lowers the platform, and a lateral feeding mechanism for feeding the elevating and lowering driving section and the platform in a direction that is at a right angle to the second traveling rail while the second overhead traveling vehicle is at a stopped position, wherein the first overhead traveling vehicle elevates and lowers the platform to transfer the article to and from the buffer, wherein the second overhead traveling vehicle moves to respective positions adjacent any of the successive storage locations of the buffer so that the second overhead traveling vehicle can transfer an article between any storage location of the buffer and the facilities, wherein the second overhead traveling vehicle transfers an article between the buffer and the facility by moving the lateral feeding mechanism to laterally feed the elevating and lowering driving section and the platform to above the buffer, the elevating and lowering driving section lowers the platform and grips an article on the buffer and elevates the platform, the lateral feeding mechanism laterally moves the elevating and lowering driving section to above a load port of a facility and the elevating and lowering driving section lowers the platform to deliver the article to the facility, wherein a running direction of the portion of the first traveling rail having the buffer immediately below and a running direction of the portion of the second traveling rail having the load ports immediately below are parallel to each other, and wherein a distance between the portion of the first traveling rail having the buffer immediately below and the portion of the second traveling rail having the load ports immediately below is such that the second overhead traveling vehicle is capable of transferring an article between a storage location of the buffer and a load port of a facility while at a stopped position.