Model 15: Stepdwell motion of a belt, based
on a crank-slider with a belt
Kinematic scheme: 
Dimensions:
|
|
Dimensions
[m] |
N teeth |
|
a |
0.050 |
|
|
b |
0.080 |
|
|
c |
0.225 |
|
|
d |
0.492 |
|
|
e |
0.050 |
|
|
f |
0.105 |
|
|
m |
0.160 |
|
|
r1 |
0.0334 |
n1=21 |
|
r2 |
0.0255 |
n2=16 |
|
r3 |
0.0382 |
n3=24 |
|
r4 |
0.0150 |
|
|
r5 |
0.040 |
|
|
belt pitch t |
0.010 |
|
|
belt 1 |
|
70 |
|
belt 2 |
|
126 |
Explanation:
The belt at the frame (between the rolls at distance d)
performs a step-dwell motion. The green slider is driven by the crank-slider
mechanism (oscillatory motion). The double pulley at the slider (radii r2
and r3) has constant rotational velocity derived from the crank
rotation. When moving to the left, the slider velocity compensates the constant
belt speed. The diagram below shows the step-dwell motion.
Literature
Remarks: The
stepsize Ds =
n3t*n1/n2
= 0.24*21/16
=
The coupler length c is adjustable by the excenter at
the slider joint.