| 摘要 |
A sewing machine with a drive-selection device capable of positioning an upper thread wiper when in a non-drive position, the drive-selection device includes a moving member movably disposed on the pivot, an actuator for moving the moving member, and a pulling member for moving the actuator. The actuator is pivoted to the base and has one end provided with an actuating end, at the actuating end is provided an actuating protrusion which engages with and moves the actuating portion, another end of the actuator is formed with an engaging portion which is pushed against by the pulling member. The pulling member is pivoted to the base and has one side provided with a push portion which protrudes toward the engaging portion, and the pulling member is further provided with a fixing portion. An elastic member is disposed between the fixing portion and the actuating portion. |
| 主权项 |
1. A sewing machine with a drive-selection device capable of positioning an upper thread wiper when in a non-drive position, a base of the sewing machine being provided with a mainshaft to move a wiper arm which includes an upper thread wiper, the wiper arm further including an oscillating member pivoted to a pivot which is fixed to the base, to the pivot being further pivoted a drive member, and one end of the drive member being moved back and forth by the mainshaft, the drive-selection device being provided on the base to selectively switch the drive member between a drive position and non-drive with respect to the oscillating member;
the drive-selection device including a moving member movably disposed on the pivot, an actuator for moving the moving member, and a pulling member for moving the actuator; wherein the moving member has one end provided with the pin which extends into an insertion portion of the drive member, the oscillating member is formed with an engaging hole, and the moving member is provided with an actuating portion; the actuator is pivoted to the base and has one end provided with an actuating end, at the actuating end is provided an actuating protrusion which engages with and moves the actuating portion, another end of the actuator is formed with an engaging portion which is pushed against by the pulling member; the pulling member is pivoted to the base and has one side provided with a push portion which protrudes toward the engaging portion, and the pulling member is further provided with a fixing portion; an elastic member has one end fixed to the fixing portion and another end fixed to the actuating portion of the actuating end, so as to produce a prestress to pull the fixing portion and the actuating end toward each other; the oscillating member is provided with a stop portion; when the stop portion is aligned with the engaging portion, the pulling member is pulled toward the oscillating member to make the push portion push against the engaging portion, so that the engaging portion is engaged with the stop portion to fix the oscillating member, and the drive-selection device is in a non-drive position. |
