| 摘要 |
PURPOSE:To smoothly operate a slide plate by interposing two spiral spring between the outside rising piece on the base part of a slide plate and a bending piece of an intermediate frame facing this rising piece and between the other bending piece of the intermediate frame and one supporting projection of a guide bar facing this bending piece. CONSTITUTION:Intermediate frames W and W' are uniformly pressed forward as well as backward through respective both bending pieces y1, y2, y'1, and y'2 by spiral springs S1, S2, S'1, and S'2 arranged on front and rear parts of base parts of slide plates 2 and 3. Slide plates are smoothly started without resistance because of the existence of no-spring parts on lower faces of intermediate frames W and W', and further, base parts 2' and 3' of slide plates 2 and 3 are uniformly elastically pressed throughout even at the limit of elasticity of springs. Thus, the transmission action due to writing uniformly and smoothly acts in any direction through wires (a) and (b) to prevent deviation and blur parts of recording.
|
