Restoring device of tension adjusting device for sewing machines

A restoring device of a tension adjusting device (A) in a transverse arm (12) for a sewing machine (10), the tension adjusting device (A) comprising a main part (20) with a plurality of tension adjusting frames (30), micro-adjusting sets (40) and restoring sets (50) connected thereto so as to form a tension adjusting mechanism (B), the restoring sets (50) being controlled by a control set (60) on the main part (20), the main part (20) having a bracket (201) at one end thereof and a second control shaft (22) extending through the bracket (201), an active member (24) mounted to the second control shaft (22) and extending beyond the transverse arm (12) so as to be connected to a control shaft (26), at least one control wheel (27) mounted to the control shaft (26) and having travel control portions (270), a passive member (25) connected to an end of the control shaft (26) that extends through the bracket (201), at least one pin (203) connected to the main part (20) and a control arm (28) mounted to the at least one pin (203), the tension adjusting mechanism (B) having threaded holes (25) and positioning rods (206), both of which are located beside the at least one pin (203);

• a tension adjusting frame (30) having a main shaft (303), a stop pin (304) and a micro-adjusting shaft (306) which is connected to a micro-adjusting set (40), a tension plate (31), a spring (32), an end plate (34) and an adjusting gear (33) respectively mounted to the main shaft (303), a hole (305) defined through the tension adjusting frame (30);
• the micro-adjusting set (40) having a micro-adjusting member (41) which is engaged with the adjusting gear (33), the micro-adjusting member (41) having a correction member (42) at a center thereof and the correction member (42) having correction rods (422) and restoring rod (421);
• the restoring set (50) having a restoring active pawl (51) and a restoring passive pawl (52) which is engaged with the restoring active pawl (51), each of the restoring active pawl (51) and the restoring passive pawl (52) having a restoring end (512/522), the restoring active pawl (51) having an action end (513) which is located opposite to a pressing board (61) of a control set (60);
• the control set (60) having the pressing board (61) to which a restoring arm (62) and an extension portion (63) are connected to two ends of the pressing board (61), two respective free ends of the restoring arm (62) and the extension portion (63) connected to the control shaft (26), a restoring member (64) located above the extension portion (63);
• the control shaft (26) having an end which extends through the main part (20) and a driving member (65) connected to the end of the control shaft (26);
• the main part (20) having an end piece (29) which is in contact with the restoring arm (62), and
• the extension portion (63) having an end being in contact with an end of the restoring member (64), the other end of the restoring member (64) having a rod (641) and the restoring arm (62) having a rod (620) so as to be engaged with the driving member (65).