| 摘要 |
An apparatus for applying labels to bottles and the like has a pickup turntable provided with a plurality of pickup heads which are orbited successively past a coating station, a pickup station, and a transfer station. Each head has a pickup face formed as an involute, and each head is rotated about an axis in a direction opposite to the direction of rotation of the turntable. The coating station comprises an adhesive-coated drum over which the pickup face is rolled, by rotating it on the turntable at a periodically increasing rate so as to prevent relative sliding between the two elements. Thereafter the adhesive-coated pickup face is similarly rolled over the uppermost label in a magazine of labels. Thereafter the picked-up label is pressed against a transfer drum which grips one of its edges and the pickup head rolls again put of contact with the label. Thence the label is pressed against an object such as a bottle. The involute surface has a leading edge which is of larger radius of curvature than its trailing edge, this pickup face being tangential at the trailing edge to an imaginary cylinder centered on the respective center of rotation of the respective pickup head. |
