| 摘要 |
The driving mechanism has a bearing hole (33) provided in the second support plate (30) and an elongated hole (22) provided in an intermediate plate (20) so as to extend in a direction perpendicular to the relative movement with respect to the second support plate (30). The driving shaft (40) has a shaft section (42) slidably supported by the bearing hole (33) and a driving section (41) housed in the elongated hole (22). The driving section has a small-diameter portion (43), a large-diameter portion (44) having a constant diameter, and a pair of transitional portions (45A, 45B) between them. The small- and large-diameter portions (43, 44) have a common axis (Z) with the shaft section (42). The minor diameter of the elongated hole (22) is substantially equal to the sum of the radii (r and R) of the small and large diameter portions (43, 44). When the driving shaft (40) is rotated so that the large-diameter portion (44) pushes the minor-diameter side of the elongated hole (22), the contact elements (11, 32) are brought into contact with each other while when the large-diameter portion (44) disengages with the minor-diameter edge, the contact is released.
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