Abstract: A rubber composition for use in tire having good reinforcing properties and fatigue properties and an improved heat build-up is disclosed, which comprises 30 to 60 parts by weight, based on 100 parts by weight of rubber, of a carbon black having a nitrogen adsorption value (N.sub.2 SA) of 35 to 105 m.sup.2 /g, a DBP absorption value of 140 to 200 ml/100 g, a 24M4DBP absorption value of 60 to 120 ml/100 g and a .DELTA.DBP of 50 to 110 ml/100 g defined by .DELTA.DBP=DBP absorption value-24M4DBP absorption value.

Abstract: A width of a selvage rubber portion extending in transversal direction of a coating sheet used for production of tire in which a plurality of cords arranged in substantially the equal interval and in parallel are integrally coated with rubber so that the cord portions are expanded, from the most externally positioned cord portion in said coating sheet, is precisely measured by transferring said coating sheet on a surface of a transferring member having a reflecting property different from that of the above described coating sheet in the longitudinal direction of said cord, emitting a light on a zone including at least the above described transferring member and the most externally positioned cord portion and detecting the light intensity distribution of the light reflected by the above described zone.

Abstract: A method of and an arrangement for wrapping a strip segment of resilient material round a take-up device having an outer peripheral surface in which the strip segment of resilient material is advanced toward the take-up device at a travelling speed which is substantially equal to the rotational speed of the outer peripheral surface of the take-up device while the front or rear end portion of the strip segment is being wrapped on the outer peripheral surface. The travelling speed is, however, determined in such a manner that a difference between the length of the strip segment and the distance around the outer peripheral surface of the take-up device therefor zero value while the intermediate portion of the strip segment is being wrapped on the outer peripheral surface.

Abstract: A radial tire building drum for forming a radial tire green case having bead portions into a toroidal shape, includes a drive shaft rotatable about a center axis of rotation and movable in a fore-and-aft direction thereof, a pair of drum units carried on the drive shaft and having a common center axis of rotation which is in axially alignment with the center axis of the drive shaft, the drum units being axially movable toward and away from each other along the center axis of the drive shaft by driving at least one of the drum units to move along the common center axis of rotation, a plurality of arcuate drum segments each retained to the pair of drum units and formed with an annular groove circumferentially extending therethrough, each of the arcuate drum segments being radially movable toward and away from the common center axis.

Abstract: In a screw-type cold feed extrusion molding apparatus is provided a size control device adapted to control the sizes of extrusion molded articles through detection of the load current of the motor for driving the feed screw and take-off conveyor of the extrusion molding apparatus at speeds which vary in such a manner as to enable a molding material to be fed smoothly from the inlet toward the extrusion die of the apparatus so that fluctuations which would otherwise be caused in the sizes of the extrusion molded articles due to the presence of a molding material stagnant in the inlet of the apparatus are precluded reliably.

Abstract: An adjustable extrusion die assembly forming part of an extruder for an elastic material, comprises: a stationary die member having an end surface; a plurality of movable die members positioned in side-by-side relationship to one another and slidably contacted with one another, the movable die members respectively having end surfaces opposing to and spaced apart from the end surface of the stationary member, the end surfaces of the stationary and movable die members defining in combination an extrusion opening through which the elastic material is to be extruded, the movable die members being individually movable toward and away from the end surface of the stationary die member with respect to one another so as to vary the distances between the end surface of the stationary die member and the end surfaces of the movable die members; a guide member having formed therein a guide slit having the movable die members guided therein; and a plurality of link members each interconnecting two adjacent movable die memb

Abstract: A method of forming a closed loop of a flexible strip, comprising conveying an elongated flexible strip in a predetermined longitudinal direction to a predetermined position on a predetermined conveyance plane, detecting the locations and geometry of end portions of the strip while the strip is being conveyed toward the predetermined position thereof, driving two carrier members to move into positions determined with respect to the end portions of the strip in the predetermined position on the conveyance plane on the basis of the detected locations and geometry of the end portions of the strip, transferring the end portions of the strip to the carrier members, respectively, from the conveyance plane, further driving the carrier members to move along paths determined to cause the strip to be gradually deformed into loop form so that the end portions of the strip have respective edges slightly spaced apart in parallel from each other, correcting the positions of the carrier members with respect to each other wh

Abstract: An ink ribbon cartridge comprises a cartridge housing, an endless length of ink ribbon received in the housing, and a take-up roller and a pinch roller for transporting the ribbon and guiding the ribbon in a repetitively folded manner, characterized in that at least one of said take-up and pinch rollers consists of a compressed body of flexible or semi-rigid polyurethane foam. The use of compressed flexible or semi-rigid polyurethane foam results in improved rollers which have the good ribbon driving performance and driving stability.

Abstract: For automatically feeding a rubbery strip to a tire-building drum for the production of, for example, a green tire, the rubbery strip is forwardly conveyed toward the tire-building drum until a leading end portion thereof is received on a smooth surface with one face of the leading end portion directed toward the tire-building drum so as to establish close contact between the other face of the leading end portion of the rubbery strip and the smooth surface portion throughout the width of the rubbery strip whereby the leading end portion of the rubbery strip is detachably retained to the smooth surface portion, whereupon the leading end portion of the rubbery strip is transferred from the surface portion to the tire-building drum for permitting the leading end portion of the strip to be wrapped round the tire-building drum and thereafter the leading end portion of the rubbery strip is cut from the remainder of the strip for forming a cut segment having a predetermined length, the tire-building drum being there

Abstract: A rubber composition suitable for use in tire tread is disclosed, which contains at least 20 parts by weight of a block copolymer per 100 parts by weight of total rubber content. This block copolymer comprises (A) a polymer segment obtained by starting from conjugated diolefin and monovinyl aromatic hydrocarbon and having a content of monovinyl aromatic hydrocarbon bond of not more than 10% by weight and (B) a copolymer segment obtained by copolymerization of conjugated diolefin and monovinyl aromatic hydrocarbon and having a content of monovinyl aromatic hydrocarbon bond of 15-50% by weight.

Abstract: A process of manufacturing a bladder which is to be disposed on each of axially opposite end portions of a tire building machine having a tire building drum, respectively, and is employed for turning back a ply cord bound on the tire building drum of the tire building machine, comprising of the steps of binding a bladder material on a cylindrical member, the bladder material being reinforced with cords and unvulcanized, the cylindrical member having two annular grooves formed in the outer peripheral portion thereof, binding a cloth belt containing water around the outer peripheral surface of the bladder material so that the bladder material is shaped conformingly to the outer peripheral portion of the cylindrical member and the two annular grooves, vulcanizing in a vulcanizing vessel the bladder material to form two annular ridges on the bladder material conformingly to the shape of the annular groove, and taking out the bladder material from the vulcanizing vessel and turning back the bladder material around

Abstract: A heavy duty pneumatic tire is disclosed, which has a tread pattern formed in a tread divided into a plurality of lands by a plurality of longitudinal grooves extending circumferentially of the tread, among which each of a first land in at least a side edge region of the tread and a second land adjacent thereto has an arrangement of blocks defined by transverse grooves arranged at a substantially equal interval in the circumferential direction of the tread. In this tread pattern, each block of the first land is arranged in zigzag form opposite to two adjoining blocks of the second land, the opposed groove walls of the longitudinal groove defining the first and second lands have a minimum distance corresponding to not more than 3% of the tread width, and the remaining longitudinal groove(s) located in a center of the tread or sandwiching the central land of the tread has a groove width corresponding to 4-10% of the tread width.

Abstract: A mark for use in rubber article is disclosed, which comprises a chromatic rubber composition layer containing not less than 30 parts by weight of at least one of chloroprene rubber and chlorosulfonated polyethylene rubber and having a thickness of 0.1 to 1.5 mm, an antioxidant-migration film barrier selected from polyester film, nylon film, vinylidene chloride film and vinylidene chloride-vinyl chloride copolymer film and having a thickness of 3 to 100 .mu.m, and an adhesive layer of thermoplastic polyester or polyurethane having a thickness of 0.005 to 0.5 mm.

Abstract: A sound damping material is disclosed, which is a composite structural body comprising honeycomb or corrugated core, plain sheet and pressure sensitive adhesive layer, a height direction of the honeycomb or corrugated core being perpendicular to a surface of a vibrating body. In this sound damping material, one pressure sensitive adhesive layer is at least existent between the honeycomb or corrugated cores or between the honeycomb or corrugated core and the plain sheet.