JPH02106182U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a front view showing the thread ring catcher and bobbin thread remaining amount detection device, Fig. 2 a is a side view of the inner hook, Fig. 2 b is a side view of the bobbin case, and Fig. 3 is the bobbin thread remaining amount. FIG. 4 is an explanatory diagram showing the detection principle, and FIG. 5 is a plan view showing the light receiving element. In the figure, 2 is a needle, 3 is a thread ring catcher, 4b is a notch, 7 is a bobbin, 7a is a hollow shaft, 7b is a collar, 8
, 9 is an opening (a passage is constituted by the above-mentioned 4b, 8, and 9), 11 is a light emitting element, 12 is a light receiving element, 15 is a microcomputer as a determination means, C is a work cloth, and T1 is a bobbin thread. be.

Claims (1)

[Claims for Utility Model Registration] A thread loop catcher 3 capable of forming stitches on a work cloth C in cooperation with a needle 2, a shaft portion 7a around which the bobbin thread T1 is wound, and both ends of the shaft portion. a bobbin 7 which is provided with a pair of flanges 7b provided on the thread ring catcher 3 and is removably attached to the thread ring catcher 3; a light emitting element 11 disposed on one side of the thread ring catcher 3; a passage provided in the thread ring catcher 3 and allowing light to pass between the detected portion made of the bobbin thread T1 or the bobbin 7 itself and the light emitting element 11; a light-receiving element 12 that receives the light projected by the light-emitting element 11 and reflected by the detected portion and outputs a signal according to the incident position of the light; A lower thread remaining amount detecting device for a sewing machine, comprising: determining means 15 for determining whether the lower thread amount in the shaft portion 7a of the bobbin 7 is less than or equal to a predetermined amount.