Strobel VTD410EV-SEPC1, Operating Instructions Manual

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5.2.3 Operating the shaft coupling for the front cup
To eliminate the blocking effect between material and feed cups, mainly when
sewing a small radius (heel parts) caused by the double feed system, the front
cup drive is equipped with a shaft coupling which can be operated electro
pneumatically by means of the left hand treadle.
When reaching the heel part the front cup drive can be interrupted by heeling
the left hand treadle, the sewing process can be terminated.
When reaching the straight shoe part, the left hand treadle is brought back to
its 0-position, the front cup drive is reactivated.
This process can be repeated at any position, unless the gathering device is
actuated.
5.2.4 Setting the differential feed (Fig. 14)
As described in point “5.2 Operating the gathering device (EV)”, for gathering
extra fullness the gathering device is swiveled down at a certain point of the
shoe. In “0” position of the stop bolt 138.0273 the feed cups run synchronously.
When setting it down to the lowest point on the selector gate (figure 6) the front
cup reduces its speed down to a total of 48 % of the rear cup speed.
Which position is suitable has to be determined by means of tests and the
different materials.