Feed reference point balancing device of sewing machine
AssigneeJanome Sewing Machine Industry Co., Ltd.
InventorsHideaki Takenoya, Kazunori Honda
Life of this patent
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Abstract
In a fabric feeding mechanism of a sewing machine there are provided a pair of elastic members each connected between two pivot axes at both ends of each of a pair of link elements. The elastic members have their pitches slightly different from those of the corresponding link elements and elastically displaceable in the longitudinal direction of the latter, so that backlash which may be caused at the pivot axes by abrasion resulting from repeated use of the sewing machine will be absorbed to thereby maintain a predetermined feed referenced point thereof.
Claims3
Device used in combination with a sewing machine having a feed control mechanism including a feed regulator and first and second transmission links operatively connected to said feed regulator, each of said first and second transmission links having both ends each connected to an adjacent element by a pivot axis and being operated to change an angular position of said feed regulator to adjust a fabric feeding amount, the improvement of which comprises first and second elastic means each connected between said two axes at both ends of each of said transmission links to normally bias said pivot axes toward each other so as to automatically balance the angular position of said feed regulator at the time of the feed amount being zero, whereby a feed reference point of said feed control mechanism may be maintained at a predetermined position.
Dependencies are inferred from the claim text.