BUTTON DETECTING DEVICE IN BUTTON INSERTING AND HOLDING MECHANISM BUTTONING SEWING MACHINE

PURPOSE:To surely detect whether or not a button exists in a button pinching foot of a button inserting and holding mechanism, to prevent a malfunction of a sewing machine and others, and to improve the sewing efficiency of a buttoning sewing machine by controlling each driving means of the sewing machine and a button supply mechanism, based on signal information from a sensor. CONSTITUTION:A sensor 24 outputs a signal related to whether a button exists in a button pinching foot of a button inserting and holding mechanism or not to each driving control circuit of a sewing machine 2 and a button supply mechanism, based on transferred information. Unless a button B exists in the button pinching foot 10, a sewing operation of the sewing machine 2 is not started, and instead thereof, a button carrying body 8 operates and supplies a button to the button pinching foot 10. when the button B exists in the button pinching foot 10, the sewing operation of the sewing machine 2 is started. In such a way, an L-shaped lever 23 being a transfer means anlarges and amplifies button sensing information of a sensing lever 22 being a contact means and transfers it to the sensor 24. Accordingly, sensing of whether the button exists or not by the contact means is transmitted exactly to the sensor 24.