摘要:
To wind a rubber strip material around a forming drum, a rubber strip material S extruded from a die 2 of an extruder 1 is spirally wound by an applicator 6 and formed around the forming drum 5 which is being rotated. In the forming operation, the peripheral speed Vd of the forming drum 5 is set lower than the extrusion speed Ve of the rubber strip material S from the die 2 of the extruder 1, that is, to a peripheral speed of 0.6 to 0.95 times the extrusion speed Ve and preferably to a peripheral speed about 0.9 times the extrusion speed Ve. With this arrangement, the rubber strip material stretched by die swelling can be contracted, a tire structural member can be formed around the forming drum with high accuracy at all times independently of the kind of the rubber strip material, and workability as well as shape stability after the rubber strip material is formed can be enhanced.
摘要:
A strip builder for winding a material strip about a rotating core includes a traveling applicator head assembly for receipt of the material strip from an upstream extruder station and transport of the strip to a downstream rotating core. The assembly includes a central support arm in longitudinal travel along the rotating core. Attached to the central support arm is a belt roller, an applicator roller spaced therefrom and a belt drive coupled therebetween. A conveyor belt is wound about the belt roller. Upon rotation of the core, the rotation of the applicator roller rotates the belt roller coupled thereto. Rotation of the belt roller drives the conveyor belt towards the core with the material strip thereon. Upon the belt passing between the belt roller and displaced applicator roller, the strip is stretched and deposited onto the applicator roller for subsequent deposit onto the rotating core. A traveling stitching roller subsequently smoothes the material strip deposited on the rotating core. The applicator and stretching rollers are pivotable relative to the central support arm such that pressure along the central support arm can be equally distributed to the applicator and stretching rollers and onto the rotating core.
摘要:
A re-treading method and an apparatus therefor, which are capable of winding a tread material on a base tire automatically and efficiently to realize an adequate joint condition of the leading and trailing edges of the tread material, are configured to take a photograph of a zone of the tread material including its cut position to compare the picture with a stored tread pattern image to detect a deviation amount between them, then moves the tread material or the cut position relative to each other by the deviation amount, next cut the tread material at the cut position after the relative movement, wind the tread material on a base tire, and unite the leading and trailing edges of the tread material. Alternatively, the re-treading method and the apparatus can detect a deviation amount of the position distant by a required tread length from the leading edge of the tread material from a predetermined pattern position near that position planned to be cut, cut the tread material at the at the predetermined position, wind the cut-out tread material on the outer circumference of the base tire while adjusting the length of the tread material by applying thereto a substantially uniform tensile or compressive force, and unite the leading and trailing edges of the tread material wound on the base tire.
摘要:
A rubber material for tire-constitutional member is laid on a rotating support at a high efficiency and a high accuracy by arranging a pair of rollers rotating in opposite directions in the vicinity of a radially outer surface portion of the support and utilizing a gap defined between the rollers as a roller die.
摘要:
A strip member is wound by a tire building machine having a building drum for taking up a strip member of predetermined length without discrete ends and a transfer conveyor for feeding the strip member to the building drum. The winding-start end of the strip member transferred from the transfer conveyor to the building drum and the winding-finish end of the strip member are detected by means of end sensors, measuring the angle through which the building drum has rotated from the output of a winding start signal to the output of a winding finish signal in response to output signals from the sensors by means of an angle detector. A lapping margin between the winding start end and the winding finish end of the strip member is calculated based on the rotational angle and diameter of the building drum by means of an operational means.
摘要:
Tire building apparatus and method wherein the cut to length tread is transported to a drum on a conveyor having laterally movable driving rollers and inverted guide rollers engaging the inner surfaces of raised shoulders of the tread. Control of the tread length is provided by measuring the length of the tread before and while it is being wrapped on the drum and then varying the stretching and rate of tread application to the drum to provide a precise splice of the ends of the tread. The position of the tread ends are controlled by a pricker bar to insure placement of the leading end on the drum and then placement of the trailing end on the drum over the leading end to provide the desired splice.
摘要:
In a method for automatically applying cut strips of material with varying lengths onto a tire building drum for manufacturing green tires a cut strip of material, comprising a forward portion with a leading edge, a middle section, and an end portion, is fed with a conveyor belt to a tire building drum. The leading edge of the forward portion is placed onto the tire building drum, being rotated at a first circumferential speed, that is substantially identical to a first feeding speed of the conveyor belt, during application of the forward portion. The first circumferential speed of the tire building drum is increased to a second constant circumferential speed for applying the middle section. Simultaneously, the first feeding speed of the end less conveyor belt is increased to a second feeding speed which is controlled as a function of the actual length of the cut strip of material. The second constant circumferential speed is reduced to a third circumferential speed and the second feeding speed is reduced to a third feeding speed, that is substantially identical to the third circumferential speed, for applying the end portion.
摘要:
A process for recapping tires with a pre-molded, pre-vulcanized tread (2) uses a device for measurement of the travelling length of the tread (2). This device includes a stop (5) which moves on a guide track (6) connected to an endless notched belt (7) held in place by two pulleys (8) and (9), a motor (10), and an optical coder (11). During the entire installation phase of the tread (2) on the casing (21), the stop (5) generates a slight force on the free end of the tread placed on a preparation table (3) incorporating rollers (4).
摘要:
A method an apparatus of applying a tire tread to a tire carcass including the steps of conveying a tread on a conveyor between two self-centering guides which are slidably mounted on a frame over the conveyor, the guides having parallel rows of rollers for engaging opposite edges of the treads; adhering one end of the tread to the tire carcass on a tire building drum; rotating the tire building drum to pull the tread over the tire carcass; and applying a predetermined uniform pressure against the opposite edges of the tire tread through the rollers to uniformly resist movement of the tread toward the tire building drum and thereby uniformly stretch the tread. The apparatus includes the use of a pneumatic piston cylinder which urges the rollers against the edges of the tread, applying uniform force perpendicular to the tread's axis regardless of the width or width variations of the tread.
摘要:
A method of attaching a belt-like member being transferred by a conveyor to a circumference of a drum comprises steps of detecting a leading end and a trailing end of the belt-like member, respectively, transferring the belt-like member by the conveyor until the leading end of the member arrives at a leading end set position, and further transferring the belt-like member and rotating the drum to attach the belt-like member to the circumference of the drum so that at the same time when the leading end of the belt-like member attached to the drum arrives at a set rotated position, the trailing end of the belt-like member arrives at a trailing end set position spaced a predetermined distance from a trailing end detected position where the tailing end was detected in the first step, thereby jointing the leading and trailing ends. In this manner, the belt-like member is attached uniformly on the drum to compensate any excess and shortage in length of the belt-like member relative to a circumferential length of the drum. If the belt-like member has leading and trailing ends bias to longitudinal directions of the member, the belt-like member is transferred at a speed substantially equal to a circumferential speed of the drum only during attaching the bias leading and trailing ends to the drum to avoid deformations of the leading and trailing ends.