| 摘要 |
PROBLEM TO BE SOLVED: To maintain the characteristics of a spring by preventing dust, dirt, paper dust, etc., contained in sucked air from directly coming into contact with the spring by providing the vacuum route of a vacuum nozzle on the inside of the spring and making the length of the route longer than the setting length of the spring. SOLUTION: A pin 7 is engaged with the hole 8 of a holder 6 and groove 9 of a vacuum nozzle 5 and controls the relative position between the hole 8 and groove 9. An urging spring 10 urges the nozzle 5 downward, and a guide section 5a is integrally formed with the nozzle 5 on the inside of the spring 10 and has a length longer than the setting section of the spring 10. Air flowing routes 11 connect spaces 12 and 13 formed of a stepped section to each other and a lid 14 which also works as a seal maintains the inside of the holder at a vacuum. Since the air flowing in the nozzle 5 through the front end of the nozzle 5 flows to a vacuum generator, after passing through a guide section 5a, the air does not come into contact with the spring 10. Therefore, the characteristics of the spring 10 do not deteriorate, because neither dust nor dirt adheres to the spring 10. |
