Abstract: A liquid-surface position detection device includes: a propagation body being disposed in a container immersed in a liquid and propagating surface waves; a vibration generation and detection means imparting vibrations to the propagation body and including a piezoelectric element detecting reflected surface waves; and a position detection means calculating the liquid surface position from the reflection time of the surface waves. The propagation body is made of a resin material and provided integrally, at the upper part thereof, with an element accommodating part which accommodates the piezoelectric element. The element accommodating part includes a bottom surface section formed so that a portion thereof juts out from a main surface forming the surface of the propagation body. The piezoelectric element is disposed so that a portion thereof juts out from the main surface, and to apply vibrations to the main surface in the vertical direction via the bottom surface section.

Abstract: A liquid-surface position detection device includes: a propagation body being disposed in a container immersed in a liquid and propagating surface waves; a vibration generation and detection means imparting vibrations to the propagation body and including a piezoelectric element detecting reflected surface waves; and a position detection means calculating the liquid surface position from the reflection time of the surface waves. The propagation body is made of a resin material and provided integrally, at the upper part thereof, with an element accommodating part which accommodates the piezoelectric element. The element accommodating part includes a bottom surface section formed so that a portion thereof juts out from a main surface forming the surface of the propagation body. The piezoelectric element is disposed so that a portion thereof juts out from the main surface, and to apply vibrations to the main surface in the vertical direction via the bottom surface section.

Abstract: A sewing machine having a presser foot for positioning a fabric to be sewn and a device for holding the presser foot. This device comprises a pair of hook arms, the ends of which releasably engage a presser foot and a scissor arm actuating device for actuating or releasing the hook arms. The actuating device and the hook arms form a unit which is movable together towards and away from the presser foot.

Abstract: A device for holding fabric pieces for blind stitch sewing. A rod which presses fabric pieces together and performs vertical reciprocating motions in synchronism with needle motions is adjusted by a level regulator which changes the lowest return point of the rod to adapt to different thicknesses of the fabric pieces being sewn.

Abstract: The invention relates to a device for adjusting position of a holding plate on which a tailoring fabric is nipped with a presser rod. Pick-up sewing is conducted by the inventive device commensurate with change of fabric thickness during sewing route.

Abstract: In an automatic pick-up sewing system for curved edges of a fabric piece such as an outer pocket on clothing such as a jacket, the clothing kept in a horizontal state with the fabric piece pressed against a sewing needle is displaced two dimensionally during pick-up sewing as programmed under computer control while the sewing needle is driven for concurrent horizontal rotation so that the point of the sewing needle should always be directed in tangential directions of a sewing line on the fabric piece. Beautiful pick-up sewing is achieved quite at high efficiency without any need for highly skilled manual operation.