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14262 Cylindrical Cam for Intermittent Motion The rst of the cam-driven indexing mechanisms to be discussed employs a cylindrical cam This mechanism, which generally has eight or more stations, is applied to crossed or skewed shafts Two of the many installations were with zipper-making equipment which had light loads at 3000 indexes per minute and with cigarette-packaging machinery allowing hopper-fed cigarettes to be inserted forty at a time, 300 times per minute into pockets of a 12-station turret cam, SAE 8617 carburized Rock C-56 to 60 The driving member is a cylindrical drum having a ridge that engages the follower rollers mounted on a disk (Fig 1434) A part of the ridge is in a plane perpendicular to the axis of the drum Its width is equal to the distance between the rollers, which serves to lock the driven disks The two ends of the ridge are curved outward The driven member is rotated by the interaction of the curved portion of the ridge with the rollers The ridge as shown provides a positive-drive action of the driven member However, this locking arrangement may be reversed and the basic kinematic function retained by having the two rollers guided by the curved ridge; the two straight branches of the ridge serve for locking There is a cut in the ridge to clear the next roller as the follower is indexed As we have previously indicated, the kinematic properties are independent of the diameter of the roller driving cam and driven disk These dimensions may be chosen arbitrarily However, a large cam diameter reduces the pressure angle or inclination of the ridge in the same manner as a helix angle of a screw thread The pressure between the cam and the follower is thus lessened In addition, the cam size is limited by the fact that as the rollers move along an arc their axes cannot point (in every position) toward the axis of the driving cam Cutting of the grooves becomes dif cult when the attempt is made to compensate for the roller position during action This can be decreased by having the axis of the driving shaft midway between the extreme roller positions.

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FIGURE 1434 Cylindrical cam for intermittent motion (eight-station indexing)

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Returning to the cam-follower action, experience has shown that rapid wear due to a large amount of sliding (spalling) is evident as the rollers withdraw from large cams Furthermore, the rollers tend to skew, owing to the end thrust Short rollers are suggested to minimize this detrimental action Some improvement may be made by employing conical rollers with the apex at the axis of the drum, but they are often troublesome to install Another hindrance of this cam mechanism is that it is often dif cult to maintain locking under dwell conditions A positive lock such as a wedge-shaped block that engages a pair of rollers during the idle period, relieving the shock load from the cam, is sometimes employed Shock and vibration may be caused by the backlash or clearance between the rollers and their groove

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14263 Grooved Concave Globoidal Cam for Intermittent Motion The concave globoidal cam is often referred to as the concave barrel cam When used for indexing, it is an improvement over the barrel cam or the cylindrical cam, Fig 1435a The concave globoidal cam has been successfully used in the paper industry where a 1000lb wheel, 50 inches in diameter, operates 16 hours per day, 100 indexes per minute, for two years without noticeable wear The follower has rollers that ride in grooves of the cam, giving positive-drive action during both indexing and dwell periods There rollers remain at a constant depth as com-

FIGURE 1435 Grooved concave globoidal cam for intermittent motion (8-station)

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