| 摘要 |
PURPOSE:To avoid the change in spring constant at tape loading operation and no usage, by fitting one end of a bias spring of a tension roller on a moving lever. CONSTITUTION:Rotating levers 7a, 7b are linked to another end of a link lever 4 linked to a rod 3a of a tension plunger 3 via a fulcrum 8, and one end of moving levers 9a, 9b of rod shape is linked to the end. Tension springs 17a, 17b are suspended between pins 16a, 16b of tension arms 12a, 12b and pins 15a, 15b implanted at a part of the rod levers 9a, 9b, and another end of the levers 9a, 9b is connected to the pins 16a, 16b. Since L-shaped levers 7a, 7b are turned against a spring 54 with activated plunger 3 at operation, the levers 9a, 9b are moved respectively right and left, and the tension arms 12a, 12b are tensioned via the springs 17a, 17b and turned by taking fulcrums 11a, 11b as centers. |
