Pulley

About: Pulley is a research topic. Over the lifetime, 51636 publications have been published within this topic receiving 178220 citations. The topic is also known as: drum & block.

Article turnover assembly

Abstract: An article turnover assembly (16) for transporting flat envelopes and the like while turning them over 180 degrees includes upper and lower crowned entrance and exit pulleys (22 and 24; 52 and 54) having two flexible endless belts (18 and 20) extending between the lower entrance pulley and the upper exit pulley and the upper entrance pulley and the lower exit pulley. The belts are twisted 180 degrees between the entrance and exit pulleys with each having at least one span contiguous to a corresponding span of the other. Registration of envelopes (10) is established at the entrance and is maintained by a horizontal flat registration plate (60) located about half of the travel distance between the entrance and exit pulleys. In addition, two opposed idler wheels (64 and 66) bias the spans together above the horizontal flat registration plate at about 3/5 of the travel distance through the assembly. Contoured stationary plows (84 and 86) are included at a downstream end of the contiguous belt spans to assist in turning the envelopes over.

Method and apparatus to check the acceptableness of the state of wear in the covering fabric of a driving belt

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.

Medical systems incorporating pulley sharing

Abstract: Provided is a robotic system that includes a surgical instrument with a wrist that allows N degrees of freedom of movement. The N degrees of freedom can be controlled by N+1 cable segments. The wrist can include a first set pulleys configured to rotate about a first axis and a second set of pulleys configured to rotate about a second axis. The wrist can further comprise one or more pulleys configured to engage two of the cable segments, wherein at least one of the pulleys is shared by a first cable segment and a second cable segment. The first cable segment and the second cable segment that share the pulley can be independent from one another. In some circumstances, the surgical instrument can be actuated in N+1 degrees of movement by advancing or retracting at least two of N+1 cable segments.

Thermal transfer printer

Abstract: PURPOSE:To make it impossible to identify informations from an ink ribbon after being used, by providing a ribbon processing means for nullifying the information remaining on the ink ribbon after the transfer of ink to the rear in the advance direction of the ink ribbon of a thermal transfer recording part CONSTITUTION:An ink ribbon 1 after recording advances along a guide by the rotary force of the ribbon motor directly connected to a drive pulley 3 through the drive pulley 13 and an idler pulley 4 and is sent into a forward cutter 6 The cutter 6 is provided in coaxial relation to the drive pulley 13, and the guide 5 and the cutter 6 are reciprocally moved in the direction shown by the arrow A by a cam in synchronous relation to the rotation of the drive pulley 13 to shred the ink ribbon 1 delivered from the drive pulley 3

Power Transmission Losses in V-Belt Drives Part 2: Effects of Small Pulley Radii:

Abstract: Run-in AV10 wrapped, raw-edged and cogged V-belts have been used to transmit power between pulleys of equal radii R equal to 51, 36 and 21 mm. Separate measurements of the torque and angular speed losses between the pulleys have shown that these are approximately proportional to 1/R and 1/R2 respectively and are also greater than expected from current theories. The maximum useful belt tension ratio fell from 21 to 5 as R was reduced from 51 to 21 mm.A dimensionless belt deformation parameter (gEI/R4)1/2, arising from a simplified analysis of torque loss, has been found empirically to correlate with both torque loss and the speed loss in excess of that expected from belt extension and radial compliance.Subsidiary tests with thick flat belts on cylindrical pulleys have shown their power losses to be unexpectedly close to those of V-belts of similar cross-sectional area, suggesting that those V-belt losses usually attributed to wedging in the pulley groove are of more general origin. It is speculated that be...