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1416 VARIABLE-DWELL CAM
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In some special machinery, it is necessary to vary the dwell period of the cam This may be accomplished by adjusting and xing the distance between two rollers in the slot, Fig 1419 Note that changing one dwell period (rise) effects a change in the total action in which two radial cams would provide greater control
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FIGURE 1419 Variable-dwell cam
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FIGURE 1420 Cam to convert linear to rotary motion
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1417 CAM TO CONVERT LINEAR TO ROTARY MOTION
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Let us now analyze a novel inverse indexing cam design utilizing a continuous trilevel cam track In this design (Fig 1420) a stationary cam pin rides in the cam track to convert horizontal linear motion into rotary motion The trilevel track guarantees the proper
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indexing directions without backtracking This mechanism has been applied to index the stays on a stamping machine A stationary pin (not shown) is in position 1 with the cam hammer assembly fully retracted At position 2, the hammer has completed its stamping blow As the hammer assembly retracks, the cam track follows the stationary pin to position 3 to impart rotary motion to the inverse cam
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1418 CAM TO CONVERT ROTARY TO LINEAR MOTION
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Six steel balls that cause an inverse-faced cam to assume an up-and-down motion result in a vibratory motion of a shaft attached to the cam (Fig 1421) This reciprocating movement of the shaft has been applied in the form of a high-frequency shock to the drill core of the rotary hammer The total shaft output was 6000 blows per minute at 1000 rpm Contoured and convex shaped, the grooved face of the cam contacts the exposed portion of the balls; the rest of the balls are housed in recesses of the ball seat, which at the same time acts as a spacer for the balls Heat-treated Nitralloy is utilized to give required hardness and to minimize wear
1419 TWO-REVOLUTIONS-PER-CYCLE CAMS
There are two designs that can ful ll the requirements of two revolutions of the cam for one complete movement of the follower These cams provide full lift of the follower with a cam rotation of more than 360 degrees The mechanism shown in Fig 1422a utilizes a double-groove cam with an oscillating roller follower A translating follower may also be used This cam has movable doors or switches A and B directing the follower alternately in each groove The grooves may be designed so that we may have follower movement or dwell as required At the instant shown, door B is ready to guide the roller follower from slot 1 to slot 2 The other door positions are shown dotted
FIGURE 1421 Cam to convert rotary to linear motion
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FIGURE 1422 Two-revolutions-per-cycle cams
In Fig 1422b we see a cam mechanism that ful lls the same requirements without the use of movable doors As before, a groove cam is employed However, the follower is made oval or boat-shaped to traverse the small radii of curvature and high-pressure angles that exist in this type of cam while also being able to maintain direction when traversing the crossovers in the cam groove Although a radial cam and an oscillating follower are shown, cylindrical cams or translating followers may also be utilized
1420 INCREASED STROKE CAMS
In Fig 1423 we see two examples of cams giving an increased stroke without increasing the pressure angle Both examples, one a radial cam and the other a cylindrical cam, are kinematically the same design The mechanism shown in Fig 1423a has the input shaft parallel to the follower movement, whereas in Fig 1423b the input shaft is perpendicular to the follower movement In both examples, the cam slides on the input shaft and is in contact with a xed roller on which the complete mechanism rides Thus the total movement of the follower is the sum of the cam displacement on the xed roller plus the follower displacement relative to the cam In simplicity one may consider the cam as a double wedge acting on the follower
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