US 11,807,969 B2
Bobbin winding device and sewing machine
Hiroki Shiratsuchi, Tokyo (JP)
Assigned to JANOME SEWING MACHINE CO., LTD., Tokyo (JP)
Filed by JANOME SEWING MACHINE CO., LTD., Tokyo (JP)
Filed on Jun. 16, 2021, as Appl. No. 17/349,461.
Claims priority of application No. 2020-111120 (JP), filed on Jun. 29, 2020.
Prior Publication US 2021/0404102 A1, Dec. 30, 2021
Int. Cl. D05B 59/00 (2006.01)
CPC D05B 59/00 (2013.01) 7 Claims
OG exemplary drawing
 
1. A bobbin winding device comprising:
a spool shaft on which a bobbin is mounted;
a switch that detects completion of winding bobbin thread around the bobbin;
a rotating body that is rotatable around an axis parallel to the spool shaft and that presses the switch, such that the rotating body moves from a non-pressing position separated from the switch to a pressing position by passing through an intermediate position along one rotation direction;
a contact portion that is provided on the rotating body, wherein the contact portion is configured so that it can come into contact with the bobbin thread, and is arranged radially outside a core portion of the bobbin at the non-pressing position and is pressed by the bobbin thread wound around the bobbin to rotate the rotating body to the pressing position along the one rotation direction;
a spring that urges the rotating body against the one rotation direction at the non-pressing position when the rotating body extends passed the intermediate position, and urges the rotating body along the one rotation direction at the pressing position when the rotating body extends passed the intermediate position;
a switching member that is rotatable around a switching member axis parallel to the spool shaft, is connected to the spring, and the switching member rotates to change a position of the rotating body at the intermediate position;
a motor that is connected to the switching member and rotates the switching member;
an outer diameter detector that detects the outer diameter of the bobbin; and
a control unit comprising a processor, the control unit driving the motor based on the outer diameter of the bobbin detected by the outer diameter detector and rotates the switching member.