Abstract: Durability of cutting performance of a fixed blade and a movable blade is increased to downsize a device as a whole and to reduce manufacture costs thereof. The device includes a flat fixed blade (21), a flat movable blade (22) having a blade edge allowed to perform horizontal movement with respect to the fixed blade (21) in directions approaching and departing from a blade edge of the fixed blade (21), a drive mechanism (23) for moving the movable blade (22) with respect to the fixed blade (21), and spacers (28) for forming a predetermined gap according to a thickness of a sheet material (5) between the blade edges (21a) and (22a) in a thickness direction of those when the blade edges (21a) and (22a) of the fixed blade (21) and the movable blade (22), respectively, intersect with each other.

Abstract: A tapered roller bearing according to the invention is such that the surface hardnesses of a raceway surface of an inner ring and rolling contact surfaces of tapered rollers are set to 63 to 69HRC. In addition, respective raceway surfaces of an outer ring and the inner ring and the rolling contact surfaces of the tapered rollers are crowned and are set such that a total crowning amount is 50 ?m or larger, an outer crowning rate is 40% or larger and a roller crowning rate is 20% or smaller.

Abstract: According to the invention, there is provided a tapered roller bearing in which, where D represents a larger end diameter of the tapered roller and L represents a roller length thereof, the roller length L is 18 mm or smaller, and a ratio of the large end diameter and the roller length of the tapered roller which is expressed by D/L is in the range of 0.55 to 0.9. In addition, respective raceway surfaces of the outer ring and the inner ring and rolling contact surfaces of the tapered rollers are crowned, and a total crowning amount is set to be 50 ?m or larger, an outer ring crowning rate is set to be 40% or larger, and a roller crowning rate is set to be 20% or smaller.

Abstract: A tapered roller bearing includes an outer ring, an inner ring, a plurality of tapered rollers interposed between the outer ring and the inner ring, and a cage for the tapered rollers. Ra is smaller than Rb where Ra represents a radius of curvature of a large end face of the tapered roller and Rb represents a radius of curvature of an end face of a large rib portion of the inner ring.

Abstract: In a tapered roller bearing, LWR/DW is in the range of 1.1 to 1.7 where LWR represents a roller effective length of tapered rollers and DW represents a roller mean diameter of tapered rollers. RCO/LRO is 30 to 150, and RCI/LRI is 50 to 260 where RCO represents a crowning radius of an outer ring, LRO represents a raceway length of the outer ring, RCI represents a crowning radius of an inner ring and LRI represents a raceway length of the inner ring. The following expressions are satisfied: 20°???30°, and ??0.87??0.334?BK???0.87??0.167, where ? represents a raceway angle of the outer ring, ? represents a roller angle of the tapered rollers, and BK represents a rib angle of a large rib portion of the inner ring.

Abstract: To provide a sheet material cutting unit which can retain the posture of a sheet material when the sheet material is cut such that a movable blade can bite the sheet material with stability. A sheet material fixedly holding portion provided in parallel with a fixed blade and a sheet material movably holding portion linked with a movable blade are provided downstream from a sheet material cutting position in a sheet material transfer direction to retain a sheet material from both sides of the sheet material when the sheet material is cut.

Abstract: A print head has a reduced power size or increased print speed that can be operated at a lower voltage or higher speed and can maintain high-quality output printing free from thinned portions. During intervals between printing operations while a print paper is being fed, pulses are applied to all print electrodes to maintain a uniform potential difference between each of the print electrodes and a counter electrode so that an electric charge is supplied to the ink meniscus. Consequently, a sufficient Coulomb force to permit ink droplets to be ejected is obtained. Therefore, during printing operations, the supplied energy can be reduced and electric charge on the ink surface can be retained. Hence, ink droplets can be ejected stably without nonuniformities.

Abstract: In an electrostatic acceleration type ink jet recording apparatus, when a voltage is preliminarily applied to ink to adjust the width of ink raises, a dedicated drive circuit has been necessary or dedicated electrodes have been necessary for forming the ink raises. According to a recording apparatus of the present invention, machining such as chamfering or steps is provided to a support body having a slit-like opening portion or, alternatively, a surface treatment such as coating an oil repellent solvent to a portion to be machined. Due to such a constitution, the width of the ink raises in the lateral direction of the opening portions can be made constant without using a method such as an electric driving so that a stable printing of dots is ensured.

Abstract: There is provided a recording apparatus capable of outputting an image which is not provided with nonuniformity of printing, stable and provided with high quality by realizing a recording head for maintaining a shape of a meniscus of ink always in a proper state without carrying out highly accurate back pressure control. Hence, a shape of front ends of base plates forming a slit-like opening portion is constituted by a shape of a wedge directing a sharpened front portion thereof to a recorded medium. Further, an inclined face portion in the shape of the wedge is subjected to a water repellant or an oil repellant processing. Or, there is constructed a constitution of providing an ink discharge mechanism for discharging extra ink at an end face portion at outside of a printing area of the base plate constituting the slit-like opening portion.

Abstract: In an ink jet recording head for an ink jet recording apparatus, insulating members are arranged between adjacent ones of a plurality of recording electrodes so that electric discharge is made less likely to occur across the recording electrodes. Thus, even where the density of the recording electrodes in the head is set high in order to achieve high resolution, ink can be stably jetted. Further, the ink can be supplied to the front end of the head without increasing a static pressure which acts on the ink in such a manner that the insulating members are disposed only in the vicinities of the front ends of the recording electrodes while the discharge withstand voltage across the adjacent recording electrodes is increased.

Abstract: A printer equipped with a print head that can be operated at a lower voltage or at a higher speed is offered. The print head permits reduction in size of the power supply or increase in the print speed. The printer can maintain high-quality output printing free from thinned portions. During intervals, paper is fed, and charge supply pulses are applied to all print electrodes to give a uniform potential difference between each of the print electrodes and the counter electrode. In this way, electric charge is previously supplied to the ink meniscus. Consequently, a sufficient Coulomb force to permit ink droplets to be squirted is obtained. Therefore, during operation, the supplied energy can be suppressed. Under every circumstance, the electric charge on the ink surface can be retained. Hence, ink droplets can be squirted stably without nonuniformities.

Abstract: There is provided a recording apparatus capable of outputting an image which is not provided with nonuniformity of printing, stable and provided with high quality by realizing a recording head for maintaining a shape of a meniscus of ink always in a proper state without carrying out highly accurate back pressure control. Hence, a shape of front ends of base plates forming a slit-like opening portion is constituted by a shape of a wedge directing a sharpened front portion thereof to a recorded medium. Further, an inclined face portion in the shape of the wedge is subjected to a water repellant or an oil repellant processing. Or, there is constructed a constitution of providing an ink discharge mechanism for discharging extra ink at an end face portion at outside of a printing area of the base plate constituting the slit-like opening portion.

Abstract: By manipulating a relative potential relationship of potentials by voltages applied to selected electrodes, nonselected electrodes and an opposed electrode 20 among a plurality of record electrodes 13a through 13z installed at vicinities of an opening portion 11 of a head, ink is injected, printing of high resolution is made possible and by using a dispersing type ink and changing polarities of the voltages applied to the opposed electrode 20 and the record electrodes, density of injected ink is made variable.

Abstract: A recording unit has an illuminating device for projecting light on an original to form an original image, and an optical device which focuses the original image formed by the illuminating device. A light control plate has a slit for allowing a portion of the original image focused by the optical device to pass through. The light which passes through the slit of the light control plate is guided onto a print head which ejects ink on a recording medium when exposed to the light.

Abstract: A laser--punch composite processing machine has a vibration-proofing frame mounted on the main frame with a preload to enhance this vibration property and a laser beam generator mounted on the vibration-proof frame, an optical beam pathway between the laser beam generator and a processing head having first, second and third tubes mounted without physical contact therebetween.