Sewing machine
AssigneeJanome Sewing Machine Co., Ltd.
InventorsMikio Koike, Jun Mafune
Life of this patent
Estimating the term…
Abstract
A sewing machine includes an upper shaft rotatable so as to drive a needle bar, a lower shaft rotatable so as to drive a hook, an upper-shaft pulley attached to the upper shaft, a lower-shaft pulley attached to the lower shaft, a belt linking the upper-shaft pulley and the lower-shaft pulley, and synchronizing a rotation of the upper-shaft pulley and a rotation of the lower-shaft pulley with each other, a belt adjusting mechanism contacting the belt and changing a belt length at a tensioned side at which the belt is drawn, and a tensioner tensioning the belt in accordance with the change in the belt length of the belt at the tensioned side.
Claims4
A sewing machine comprising:
- an upper shaft rotatable so as to drive a needle bar;
- a lower shaft rotatable so as to drive a hook;
- an upper-shaft pulley attached to the upper shaft;
- a lower-shaft pulley attached to the lower shaft;
- a belt linking the upper-shaft pulley and the lower-shaft pulley, and synchronizing a rotation of the upper-shaft pulley and a rotation of the lower-shaft pulley with each other;
- a belt adjusting mechanism contacting the belt and absorbing slack at a tensioned side at which the belt is drawn by moving in or away from a direction in which the belt adjusting mechanism pushes the tensioned side;
- and
- a tensioner tensioning the belt in accordance with an absorbing level of the slack of the belt;
- wherein the tensioner comprises;
- a tension adjusting idler contacting the belt at the loosened side where the belt is drawn out;
- and
- an elastic member connecting to the tension adjusting idler.
Dependencies are inferred from the claim text.