摘要:
A tap drive unit for machine tools, which is coupled to the machine-head of the machine tool such as a machining center, includes a driver detachably coupled to a main spindle of the machine tool so as to be rotated with the main spindle, a support member for rotatably supporting the driver, the support member being fixedly mounted on a stationary portion of the machine tool when the driver is coupled to the main spindle of the machine tool, a tubular guide member supported by the support member so as to be concentric with the driver, and a rotational shaft on one end of which a tap is mounted. The guide member is axially moved when a load larger than a predetermined value acts on it. An internal thread is formed in the inner periphery of the guide member. An external thread is formed in the outer periphery of the rotational shaft so as to be threadably engaged with the internal thread. When the main spindle of the machine tool is rotated, the rotational shaft is axially moved in accordance with the pitch of the tap by the interaction of the internal and external threads. Obstruction of the downwardly axial movement of the tap applies a load upon the guide member which then moves upwardly and operates a mechanism to reverse the direction of the spindle.
摘要:
A tapping apparatus in accordance with this invention includes a frame, a spindle mounted on the frame for rotation and axial movement and provided with a tap coupled to one end thereof, the spindle being driven by a driven source, an external thread section formed in the outer periphery of the spindle, a guide member rotatably mounted on the frame and having an internal thread section formed in the inner periphery thereof, the internal thread section being threadably engaged with the external thread section, and a synchronous rotation mechanism for rotatably driving the guide member in synchronization with the spindle so that the axial movement of the spindle agrees with a pitch of the tap.
摘要:
Air fuel ratio sensor for use in an exhaust gas purification system for an internal combustion engine. The sensor has an outer and inner cover 12 and 13 for protection of lead wires 16, 18 and 19 to a detecting element 3 and a heater 5 of the sensor, a rubber seal for 2 for obtaining a sealing between the covers and the lead wires and a water repellent filter 36 for obtaining a seal between the inner and outer covers 12 and 13, while keeping an air ventilation capability of the space inside the covers. For receiving the lead wires 16, 18 and 19, the seal 2 is formed with holes 20such that the minimum thickness between the holes and the minimum thickness between the hole and an outer surface of the seal is 1 mm or more. A crimping of the outer cover 12 is done so that a deformation of the seal 2 in a range between 10 to 20% of the outer diameter is obtained.A crimping of the outer cover 12 is further done at a first section 12A at a larger force for fixation of the outer cover 12 to the inner cover 12 and at a second section 12B at a smaller force for holding the water repellent filter 36 between the outer and inner covers. In the crimping, the crimping at the first section is completed simultaneously or earlier from the completion of the crimping at the second section.
摘要:
An air fuel ratio sensor has a sensor element having a sensing portion and a flange portion in contact with a tapered portion of an accommodation hole of a housing. The sensor element is hot crimped at a hot crimping portion of a housing. At least the hot crimping portion is made of a ferritic stainless steel formed by cold forging and having a composition content comprising a total amount of C and N impurities of 0.03 wt % or below. The average hot crimping temperature of the housing is performed at lower than 1000.degree. C. as applied for a time period of one second or less.
摘要:
Hair treatment compositions, hair damage protective agents and hair care products, each contain an active ingredient comprising an antibody which binds to human hair keratins which constitute intermediate-diameter filaments. This antibody can be produced efficiently and in a large quantities from the milk of a bovid animal immunized with said keratins. As this antibody binds to the hair specifically, it is effective in preventing the elution of proteins from the hair, imparting smoothness and flexibility to the hair, and improving the adaptability to combing and luster of the hair.
摘要:
In a system for measuring a surface potential of a sample, a probe is located above. A surface of the sample with a small gap and is vibrated by a piezoelectronic element which is energized by a oscillator. A potential of the distal end of the probe is changed and is converted into an electrical signal. The surface potential is obtained from the electrical signal.
摘要:
In a direct-heated flow measuring apparatus including a thin-plate sensing element supported by a supporting member in a passage, a sensing portion for generating heat and detecting the temperature thereof is positioned on the downstream side of the sensing element with respect to a fluid stream.
摘要:
A direct-heated gas-flow measuring apparatus including a measuring tube disposed in the gas stream, a film resistor for generating heat and detecting the temperature thereof, and a feedback control circuit for controlling the heat generated by the film resistor so that the temperature of the film resistor is a predetermined value. Provided in a supporting portion of the film resistor for supporting it to the measuring tube is an aperture for throttling the heat transfer thereof.
摘要:
A method for forming an ultrafine particle film of compound includes the steps of evacuating a vessel provided with an evaporation source in its bottom portion, by which a material to be evaporated is retained, and a base plate in its upper portion, on which ultrafine particles of compound are to be deposited, supplying a reactive gas into the evacuated vessel, evaporating the retained material by heating the evaporation source and making the material interact with the reactive gas to form ultrafine particles of compound and depositing the formed ultrafine particles of compound on the base plate. The reactive gas is directly supplied to an interaction area adjacent to the evaporation source, in which the evaporated material concentrically exists. And a device for forming a ultrafine particle film of compound has a vessel for forming a reactive gas atmosphere, an evaporation source for retaining and heating a material to be evaporated, which is provided in the bottom portion within the vessel, a base plate on which ultrafine particles of compound are to be deposited and which is provided in the upper portion within the vessel so as to be opposed to the evaporation source in the vertical direction, and a gas introducing pipe for supplying a reactive gas into the vessel, which has a gas injection port positioned in an interaction area adjacent to the evaporation source.
摘要:
A spark plug with a wide discharge gap includes an insulating layer formed on one or the other of its center and ground electrodes and disposed in the gap between the electrodes. The insulating layer includes an inner insulating layer of a material having a high dielectric constant and an outer insulating layer of a material having an excellent resistance to heat and high voltage, which surrounds the inner insulating layer, whereby ensuring a reduced discharge voltage, an improved ignition performance and improved heat resistance and durability.