| 摘要 |
PURPOSE:To prevent the effective length of a spring part of a return leaf spring from being varied with the quantity of a molding resin used at the time of assembly, by providing a bent rising part raised in a bending direction of the return leaf spring at one end part of the spring, and fixing a fixed part including the bent rising part. CONSTITUTION:A return leaf spring 36 is formed in a body with a coil base 10, and a bent rising part 36a raised in a bending direction of the spring is provided at one end part of the spring 36. A fixed part 36b including the bent rising part 36a is inserted into a potting hole 24 in a base 22, and is fixed by pouring a molding resin 25. With the spring 36 provided with the bent rising part 36a, the spring constant of the spring 36a can be maintained at a constantly fixed value, so that a printing quality can be enhanced. |
