Pfaff 467 User Manual

24. Timing the Mechanical Opener
Accurate setting of the bobbin case opener seems to present a problem to many mechanics
so that they prefer to render it inoperative rather than go to the trouble of adjusting it. Before
you tackle this adjustment, it is imperative that you revert to Chapter 23 again in which the
advantage afforded by this device are discussed in detail.
There are two different adjustments required:
1. The adjustment of the mechanical opener drive, and
2. the timing of the mechanical opener finger.
On the new high-speed seamers, the feed rock shaft is arranged on the right, and the feed
lifting shaft on the left of the sewing hook, as seen from the hook-end of the machine. More
over, the feed lifting shaft of the Pfaff 467 is of the rotating rather than the oscillating type
and carries the feed lifting eccentric and, behind it, an eccentric which drives the bobbin case
opener shaft. The throw of this eccentric is transmitted to the eccentric connecting rod, a
crank mechanism and the bobbin case opener shaft. The oscillating motion of the bobbin
case opener finger can be adjusted by loosening binding screw e (Fig. 29) and turning the
opener finger on its shaft, as appropriate. The mechanical opener is set correctly on its shaft
if the opener finger at its extreme left position contacts the projection on the bobbin case and
rotates the latter counter-clockwise just sufficiently to center the position finger in the position
slot and ensure that the needle thread can pass through the clearance gap freely. This gap
should be .012", or 0.3 mm, wide (Fig. 31). Prerequisite for this is that the mechanical opener
shaft is timed correctly. To time the mechanical opener, loosen both set screws a and b
(Fig. 29) and rotate the rear eccentric on the feed lifting shaft.
Fig. 29
'4
R 9163
33
From the library of: Superior Sewing Machine & Supply LLC

Pfaff 467 Specifications

General

Brand	Pfaff
Model	467
Category	Sewing Machine
Language	English