2. Indexing In this mode of operation, reciprocating motion applied to the driving race of the clutch is transformed into uni-directional intermittent motion at the driven race. For example, on a feeding roller, the clutch is mounted on the roller and a torque arm is connected to the driving race of the clutch. A crank motion mechanism provides reciprocating motion to the driving race. The clutch drives in the forward stroke (index) and overruns on the return stroke, resulting in intermittent uni-directional motion of the feeding roller. Please reference Figure 2 for an example of a typical indexing application. CAM CLUTCH BASICS
Figure 2: General indexing application example
Indexing Application & Selection begins on page 18.
Application
Characteristics*
Cam Clutch Model Options
High speed, Small feed angle
FREQUENCY: More than 300 cycles/min. FEED ANGLE: Less than 90° FREQUENCY: Less than 300 cycles/min. FEED ANGLE: More than 90° FREQUENCY: Less than 150 cycles/min. FEED ANGLE: More than 90° FREQUENCY: Less than 300 cycles/min. FEED ANGLE: More than 90° FREQUENCY: Less than 300 cycles/min. FEED ANGLE Less than 90°
Contact Tsubaki
Low-medium speed, Small feed angle
MIUS, PBUS, MZEU, MZ, TFS, TSS, BB
Contact Tsubaki
Low speed, Large feed angle
Backstop device for indexing
MIUS, PBUS, MZEU, MZ, TFS, TSS, BB
Infinite variable feed
MIUS, PBUS, MZEU, MZ, TFS, TSS, BB
* FEED ANGLE is the degree of rotating that the Cam Clutch must accommodate while indexing. See page 18 for more details.
Cam Behavior and Cam Clutch Operation In indexing applications, reciprocal movement of a certain angle (0 ) is provided at the outer race of the Cam Clutch to perform engagement and overrunning in turn continuously and obtain intermittent rotation. In the case of the Cam Clutch shown in the figure to the right, when the outer race moves from A to B, the Cam Clutch engages to rotate the inner race (of the driven side) by angle 0 , i.e., from a to b. However, the Cam Clutch does not operate to stop the inner race at position b. When the outer race rotates in reverse from B to A, the Cam Clutch overruns while the inner race (of the driven side) does not rotate. By repeating this sequential movement, the inner race (of the driven side) rotates intermittently within the preset angle (0 ).
Reciprocal movement of the outer race Intermittent movement of the outer race
θ
B
A
b
a
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