| 摘要 |
A drawing head 11 of a pens exchanging mechanism has a pair of stationary arms 12 and 13 attached at one edge of a drawing head and a pair of rotary arms 14 and 15 pivotably attached at opposite edge of the head. In order to hold stably and surely the writing instrument 10, a spring force of the lower rotary arm 15 deflecting toward the stationary arms 12 and 13 is designed to have a strong one. When the drawing head 11 comes near a stocker in order to carry out writing instruments exchanging operation between the stocker 19 and the drawing head 11, an extruding arm 18 on the lower rotary arm 15 hits a securing member 24 installed on the stocker 19. Further movement of the drawing head 11 rotates the rotary arm 15 and the rotary arm 15 goes away from the writing instrument 10. Then the upper rotary arm 14 engages with a rotary arm 21 of the stocker 19 and rotates going away from the writing instrument 10, thus a holding of the instrument 10 is transferred from the drawing head to the stocker.
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