Abstract: A sewing machine cover 2 includes a cover main body 7 and an extension cover portion 8. The cover main body 7 houses a left-right embroidery-frame drive mechanism 60 for driving an embroidery frame 50 in leftward and rightward directions. The extension cover portion 8 houses a front-rear embroidery-frame drive mechanism 80 for driving the embroidery frame 50 in front and rear directions. An opening 35 for engaging with an engagement portion 11 of a bed portion 3 is formed in a wall 31 of the cover main portion 7. When the sewing machine cover 2 is used as a cover of a sewing machine M, a bed surface 12 and an upper surface of the wall 31 form a substantially continuous work surface.

Abstract: A fabric feeding device for a sewing machine, including a horizontally and vertically reciprocable feed dog, a feed control cam member with a forward and a reverse feed cam for controlling forward and reverse feed distances of the feed dog, a manually operated feed adjusting member for operating the cam member, a control plate operated by the cam member for changing the angle of a feed regulator for adjusting the fabric feed distances, an auxiliary feed cam member operated by a manually operated buttonhole stitching pattern selector member, an auxiliary feed plate positioned by the auxiliary feed cam member and cooperating with the feed control cam member to move the control plate, a buttonhole reverse feed auxiliary cam member operated by the feed adjusting member, and a buttonhole fine feed adjusting lever rotatably supported by a manually operated buttonhole fine feed adjusting masher and positioned by the buttonhole reverse feed auxiliary cam member for positioning the auxiliary feed plate, wherein a smal

Abstract: In a thresholding method for segmenting gray scale image which is less dependent on the concentration distribution of the input image, the threshold in determined as a zero-cross point of a histogram difference between the concentration histograms for the gray scale image within the window at a window position at which the window contains more high concentration region and at a window position at which the window contains more low concentration region. Also, in a method of determining a background concentration distribution from an image having an arbitrarily distributed pattern, the background concentration level is determined as a peak concentration or a mean value concentration of a low concentration section of the histogram difference of the concentration histograms for two associated windows.

Abstract: In a thresholding method for segmenting gray scale image which is less dependent on the concentration distribution of the input image, the threshold in determined as a zero-cross point of a histogram difference between the concentration histograms for the gray scale image within the window at a window position at which the window contains more high concentration region and at a window position at which the window contains more low concentration region. Also, in a method of determining a background concentration distribution from an image having an arbitrarily distributed pattern, the background concentration level is determined as a peak concentration or a mean value concentration of a low concentration section of the histogram difference of the concentration histograms for two associated windows. Also.

Abstract: In a flow quantity test system for a mass flow controller, a gas source for measurement is provided to supply gas for measurement. A cutoff valve for start of measurement is connected at its inlet port to the gas source for measurement and is connected at its outlet port to an inlet port of the mass flow controller. The cutoff valve for start of measurement is opened to flow the gas for measurement therethrough and closed to block the flow of the gas for measurement therethrough. A pressure gauge is provided to detect pressure of the gas for measurement appearing at the outlet port side of the cutoff valve for start of measurement. A microcomputer is provided to close the process gas cutoff valve and open the cutoff valve for start of measurement to change pressure detected by the pressure gauge.

Abstract: An acoustic vibrator member includes a substrate sheet made of propylene resin with solid microparticles dispersed therein and a film made of propylene resin laminated on the substrate sheet. The film carries a printed visible pattern. The vibrator member is freely colorable while retaining suitable physical properties.

Abstract: Position of an object is detected by a position detector (10) and position data detected by this position detector is stored in a memory circuit (11). A time data supply section (21) supplies time data (.DELTA.t) as a lead compensation parameter. A compensation circuit (22) reads out position data (Dx (-.DELTA.T)) for a preceding time corresponding to the supplied time data (.DELTA.t) from the memory circuit (11) and corrects at least one of present position data (Dx) and target position data (Sx) in accordance with the difference between the read out position data and the present position data detected by the position detector thereby performing lead compensation. A control signal relating to the position of the object is generated in accordance with the present position data corrected by the compensation cirucit and the target position data and the positioning control is made by this control signal.

Abstract: A diaphragm for use in an electro-acoustic transducer comprises a diaphragm main body only or mainly composed of natural fibers, a layer formed by laminating thereover a polyamide resin and a synthetic resin coating layer further formed to the surface of the laminate layer. The diaphragm is free from pin holes, exhibits satisfactory water proofness and excellent physical properties such as sonic propagation velocity inherent to the natural fibers. It can be fabricated with ease at a good yield and can reduce the fabrication cost.

Abstract: A buttonholer for forming hemstitches along the opposite legs of a buttonhole and bar tacks at the opposite ends of the same. A buttonholing feed regulating plate is mounted slidably on a feed control cam having a uniform lift cam surface formed in the circumference thereof, and the position of the buttonholing feed regulating plate relative to the feed control cam is decided by means of a buttonholing feed regulating cam to set a feed amount of the feed dog for hemstitching the legs of a buttonhole. An actuator plate is mounted slidably on a lateral jogging control cam having a cam surface formed in the circumference thereof, and the position of the actuator plate relative to the lateral jogging control cam is decided by means of a hemstitching groove cam which is driven by the main shaft of the sewing machine.

Abstract: A ferromagnetic core fixed to an end of a wire is electromagnetically attracted such that the core and wire are axially moved so that the free end of the wire strikes paper through a ribbon to print a dot. A leaf spring returns the core and wire to a standby position in which the core abuts against a stopper and the leaf spring is resiliently deformed. A washer having an annular axially extending projection is urged by a compression spring against a spring seat, thereby urging the spring seat against a shoulder of a housing. The leaf spring is disposed in an annular gap between the washer and spring seat. The washer serves the dual function of preventing movement and frictional abrasion of the spring seat and absorbing impact energy of the core against the stopper upon axial wear of the core and stopper.