Model 12: Escort / quick return path mechanism (Watt-2),

used in an egg-box closing machine

 

Kinematic scheme:

 

Dimensions:

 

 

Dimensions according literature [m]

a

0.2436

b

0.2436

c

0.5303

d

1.5307

e

0.8899

f

0.0779

g

0.0555

h

1.1036

m

0.3551

k

0.3526

φ

220

 

 

Explanation:

The path of point P is a coupler curve of the four-bar linkage A0ABB0, such that a part approximates a straight line. To pass this part with constant speed, a double crank mechanisms D0DEA0 has been placed in series with the four-bar. This mechanism is typically suited for use in a continuously moving production machine, when during the escort of the product a contact force is required. In the egg-box application point P escorts the egg-box, while the cover is closed. Point P holds down the box during a critical phase in the folding operation, preventing that the egg-box will be lifted off the production belt.

 

Literature: Klein Breteler, A.J.: Kinematic optimization of mechanisms, a finite element approach (chapter 9.3). Thesis TU Delft, 1987. ISBN 90-370-0012-6

 

Remarks:The double crank mechanism of the model has been assembled wrong! (red and blue link should be mounted like in the pictures).

 

 

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