Patent ID: 8677855
Filing Date: 2014-03-25
Classification: B25J,H01L,Y10T

Abstract:
1. A conveyance arm comprising: a first parallel link mechanism having a first drive side link with an end connected to a drive axis and first driven side link arranged in parallel to the first drive side link; a second parallel link mechanism having a second drive side link with an end connected to an opposite end of the first drive side link via a rotational axis rotatably and a second driven side link with an end connected to an opposite end of the first driven side link via a rotational axis rotatably, the second driven side link being arranged in parallel to the second drive side link; a short link connecting ends of the links of the first parallel link mechanism and the second parallel link mechanism rotatably; and a rotational angle transmission mechanism having a linear conversion link mechanism for converting rotation applied to the first drive side link into linear movement along the short link and a rotation conversion link mechanism for converting the linear movement into rotation to rotate the second drive side link in an opposite direction by an angle equal to a rotational angle of the first drive side link, wherein rotation applied to the first drive side link of the first parallel link mechanism causes an opposite end of the second parallel link mechanism to move back and forth, the rotational angle transmission mechanism has a first link rod with an end mounted on a predetermined position of the first drive side link rotatably, a second link rod with an end mounted rotatably on a position extended in a direction of a tip end of the second drive side link of the second parallel link mechanism in a horizontal plane, and a guide means to which opposite ends of the first and second link rods are mounted rotatably, the guide means for guiding the opposite ends of the first and second link rods in a linear direction, the positions on which the first and the second link rods are mounted are symmetrical with respect to the short link in common, and rotation applied to the first drive side link of the first parallel link mechanism causes the one end of the second link rod to follow a circular track which is symmetrical with a circular track drawn by the one end of the first link rod with respect to the short link.