| 摘要 |
1,207,939. Roller conveyers. CLARK EQUIPMENT CO. 8 July, 1969 [16 July, 1968], No. 34374/69. Heading B8A. For transferring articles between powered roller conveyers 20, 30, the main conveyer 20 includes a section 23 of transfer rollers 24 which have raised helical threads 25. Blocking rollers 26, 27 also have threads and are raised and lowered under manual control or under the control of a system 50 which responds to switches 28, 29 for detecting the articles. The blocking rollers 27, for example, are raised and lowered by an actuator 36 and are driven by gearing 42, 43. Drive chains 35 connect the other rollers. For transfer of an article 40 along the main conveyer 20, the blocking rollers are below the other rollers and the article is not substantially moved to either side by the helical threads of the transfer rollers 24. When the article is stopped by raising of the blocking roller 27 the article is moved laterally on to the auxiliary conveyer by the screwing effect of the rollers 24 and of the roller 27. In transferring articles from the auxiliary conveyer to the main conveyer the blocking roller 26 is raised to prevent forward movement of an article along the main conveyer until the article is fully on the main conveyer. By providing two or more sets of helical threads 25A, 25B, Fig. 3, heavier loads will be carried by both threads but lighter loads by the higher threads alone. |
