Abstract: An apparatus for handling a plurality of driving belts 2 disposed close to each other and hanging from a horizontal supporting bar 4 carried by a handling support 3 in a loading station 10. The belts are laterally engaged, from opposite sides, between two first dragging elements 26 adapted to be simultaneous moved close to each other from opposite sides relative to the belts 2. The belts 2 are elastically deformed by the dragging elements and thereby take a configuration having two vertically aligned loops 38, 39 widening in a direction away from the dragging elements 26. The dragging elements 26 are trained around respective idler pulleys 27, 28, 31 operable for causing the displacement of the belts 2 and the selective transferring of the belts to second dragging elements 42 that will convey the belts to different work stations 5, 5aa according to a predetermined sequence.

Abstract: A method and apparatus for carrying out the checking of the state of wear of a covering fabric in a driving belt (2) mounted on a plurality of pulleys (3, 4, 5) by measuring the electric resistance variations of the belt fabric. The apparatus provides that at least two of the pulleys (3, 4, 5) should be electrically insulated with respect to each other and connected to an electric circuit (20) designed to apply an electric voltage to said pulleys in order to carry out the measuring of the electric resistance of the fabric exhibited by belt stretches (A, B) comprised between the pulleys themselves. The electric resistance thus found lends itself to be compared with predetermined resistance values corresponding to different states of wear of the belt (2) fabric. The work surface of the belt (2) is coated with an electrically conductive fabric (12) acting by contact on the pulleys (3, 4, 5) and having characteristics of tensile strength.

Abstract: A sleeve (4) is fitted on a supporting table (3) to be positioned in front of a storage device (42) which carries a plurality of rolls (27) of first ribbon-like manufactured articles (25) contained in respective boxes (43). Each box has a transferable film (30) bearing identification inscriptions thereon, applied to a paper substrate (29). One of said manufactured articles (25) is unfolded and longitudinally extended on the sleeve (4) by a first grasping member (55) in order to be then cut by a cutting member (68) acting close to the box. A heated presser roller (32) longitudinally movable on the ribbon-like-manufactured article (25) causes the transferring of the film (30) to the sleeve (4).

Abstract: Installation for the automated manufacture of transmission belts, having equipment for the preparation of a multi-belt sleeve including at least one coiling machine (SP) on toothed drum, a calendering machine (CL1) for the application of a rubber composition, a molding and curing station (V1) and a final station (FN) having at least one checking machine (CQ) connected to a central control unit (UCC). The checking process is based on the use of a narrow range of tolerance wherein the values of the magnitude under control are acceptable, and of a wider range of tolerance external to the previous one, wherein the values of the magnitude are acceptable in a conditional manner, for example, in relation to the time of permanence within such range, and in any case after a final verification of the product affected by the anomaly.

Abstract: A method and apparatus for carrying out the checking of the state of wear of a covering fabric in a driving belt (2) mounted on a plurality of pulleys (3, 4, 5) by measuring the electric resistance variations of the belt fabric. The apparatus provides that at least two of the pulleys (3, 4, 5) should be electrically insulated with respect to each other and connected to an electric circuit (20) designed to apply an electric voltage to said pulleys in order to carry out the measuring of the electric resistance of the fabric exhibited by belt stretches (A, B) comprised between the pulleys themselves. The electric resistance thus found lends itself to be compared with predetermined resistance values corresponding to different states of wear of the belt (2) fabric. The work surface of the belt (2) is coated with an electrically conductive fabric (12) acting by contact on the pulleys (3, 4, 5) and having characteristics of tensile strength.

Abstract: A sleeve (4) is fitted on a supporting table (3) to be positioned in front of a storage device (42) which carries a plurality of rolls (27) of first ribbon-like manufactured articles (25) contained in respective boxes (43). Each box has a transferable film (30) bearing identification inscriptions thereon, applied to a paper substrate (29). One of said manufactured articles (25) is unfolded and longitudinally extended on the sleeve (4) by a first grasping member (55) in order to be then cut by a cutting member (68) acting close to the box. A heated presser roller (32) longitudinally movable on the ribbon-like-manufactured article (25) causes the transferring of the film (30) to the sleeve (4).

Abstract: A method and apparatus for producing splined driving belts from a flexible annular element of vulcanized rubber, having a flattened rectangular section and mounted around two support rollers operated in rotation so as to move the annular element according to the direction of its longitudinal extension. A first set of knives transversely penetrates into the annular element for producing one series of longitudinal cuts parallel to the annular element according to a predetermined depth and in an inclined direction relative to the perpendicular line of an operating surface of the annular element itself and a second set of knives produces a second series of longitudinal mutually-parallel cuts inclined with respect to the cuts of the first series so as to form a series of longitudinal grooves in the annular element.

Abstract: An elastic driving belt stretched between two pulleys of fixed distance between centers and having a predetermined starting tensioning, undergoes a permanent elongation such that the residual elastic elongation has a percent value included between the detectable percent contraction values along the inner edge of the belt itself when the latter is respectively wound according to two predetermined bending lines, the residual elastic elongation being detected by measuring the residual tensioning value on the belt when the permanent elongation has occurred, and reading the elongation value corresponding to the residual tensioning value on a load-elongation graph relating to the belt.

Abstract: A toothed belt (1) having between its teeth (7) and the grooves (8) adjacent to the said teeth curvilinear connection segments (17) whose ends are located on the end of the tooth flank and the base line delimiting the grooves. The first end (18) of the curvilinear connection segment coincides with the first terminal point of an arc (20) tangent to the end of the flank and to the base line delimiting the grooves, the second end (19) of the curvilinear segment being located between the second point (21) of the said arc and the point of intersection (22) of the central axis of the groove L-L and the base line. Preferably, the toothed belt forms part of a transmission member including pulleys in which at least one of the pulleys is provided with teeth (24) filleted laterally with respect to the adjacent grooves (23) by curvilinear segments (31, 32) shaped to correspond to the curvilinear connection segments of the belt.

Abstract: A toothed belt having between its teeth and the grooves adjacent to the teeth curvilinear connection segments whose ends are located on the end of the tooth flank and the base line delimiting the grooves. The first end of the curvilinear connection segment coincides with the first terminal point of an arc tangent to the end of the flank and to the base line delimiting the grooves, the second end of the curvilinear segment being located between the second point of the arc and the point of intersection of the central axis of the grooves and the base line.

Abstract: A tensioning device is provided for a flexible belt wound around the pulleys of a drive mechanism. The tensioning device includes an elastic biasing element and a damping mechanism. The biasing element applies a force on the belt in a predetermined direction to oppose belt slackenings. The damping mechanism dampens movements of the belt. The biasing element and the damping mechanism constitute a single unit wherein both exert on the belt forces which act on the belt at the same time in a predetermined direction to maintain a predetermined tensioning. The biasing element acts independently of the damping mechanism in the presence of considerable slackenings of the belt and functions as part of the damping mechanism to dampen thrusts of the belt acting on the device in the direction opposite to the predetermined direction. A connection unit connects the damping mechanism to the biasing element.

Abstract: A belt formed of elastomeric material is provided for transmission of forces in cooperation with at least two pulleys. The belt is formed by an outer part under traction, an inner part under compression and an intermediate part interposed between the inner and outer parts. The inner part includes at least two lateral, opposite and convergent surfaces suitable for transmitting frictional forces with the corresponding surfaces of the pulleys. The belt includes a plurality of transversely directed alternating protuerances and cavities in the inner part. The sequence of transversal cavities and protuberances define an undulated profile. The ratio between the pitch (p) and the depth (h) of the transversal cavities is between 8 and 20, and the ratio between the radius of curvature (r) of the transversal cavities and the depth (h) of the cavities is between 3 and 6.