| 摘要 |
PURPOSE:To prevent the occurrence of the irregular rotation of a drum by optimizing the joint structure part of a drum shaft for transmitting rotary driving force. CONSTITUTION:The drum shaft 23 is provided with a hole part and, an end bracket 20 is provided with an end bracket shaft 21 engaged with the hole part. The shaft center of the drum shaft 23 is aligned with that of the end bracket shaft 21, and the drum shaft 23 is caused to act to support one side of a drum assembly body. In addition, the device is constituted in such a way that a parallel pin 22 is provided perpendicular to the end bracket shaft 21, and a tapered groove part 23b is provided on the edge part of the drum shaft 23. Here, the parallel pin 22 is engaged with the tapered groove 23b at the time of mounting the drum so that the device is caused to act to transmit rotary driving force of the drum shaft 23 to the drum assembly body. Furthermore, the device acts to press the parallel pin 22 against the tapered part of the tapered groove 23b by pressing the entire drum on the drum shaft side by means of an elastic body such as a spring. Therefore, the play caused by engaging the drum shaft with the end bracket shaft does not exist so that the occurrence of the irregular rotation can be prevented. |
