Pfaff 345 User Manual

Threading and Replacing the Bobbin Case
3 the full bobbin in the bobbin case so that it turns in the direction indicated by
TOW in Fig. 6 when you pull the thread.
the bobbin fast in the bobbin case, pull the thread into slot X, and draw It under
ension spring and into delivery eye Y.
-- the bobbin case with the bobbin on the center stud of the bobbin case base and
:• latch B (Fig. 4).
8. Selecting the Correct Needle
All Pfaff machines 341, 343. 345 and 353 use Pfaff System 134 needles with a shank dia
meter of 2.0 mm (approx. V«"). while the Pfaff 343 U-12 is fitted with System 190 needles.
High-lift machines, e.g. the Pfaff 345 in Model H 3. use System 134-35 needles which are
4.0 mm (approx. Vsz") longer.
Pfaff cylinder-bed sewing machines are supplied in three models fitted for the needle
sizes indicated.
Model A for needle sizes 60 to 80
Model B for
needle sizes 90 to 110
Model C for
needle sizes 120 to 160
The number indicating the needle size is identical with the diameter of the needle
- shaft, or blade, in hundredths of a millimeter. Thus, a No. 100 needle has a shaft dia
meter of '""/loo mm = 1 mm.
The correct needle size for a given thread should be selected from the Needle and
Thread Chart on page 10.
System 134 and 134-35 needles are available in several point styles to suit different
applications of the machine for fabric and leather stitching.
For fabncs. all machines use round-point needles, while the following needle point
styles are available for leather work:
134 Lr # Narrow reverse twist point; cutting edge set at an angle of 45 degrees
to the right of the line of stitching, makes stitches which extend diago
nally toward the left.
134 P m Extra-narrow wedge point; cutting edge set at an angle of 90 degrees to
the line of stitching; makes stitches which extend diagonally toward the
left.
134 Lack m Needle with point for patent leather (narrow cross point).
134 PCI Extra-narrow, left-twist groove, wedge point; cutting edge set at an
angle of 90 degrees to the line of stitching; for coated fabrics.
134 S I Narrow cross point; cutting edge set parallel to the line of stitching:
makes long, straight stitches.
134 D ^ Triangular point; flat side facing toward the sewing hook; makes
straight stitches.
134 Vr « Reverse-twist spear point; cutting edge set at an angle of 45 degrees to
the right of the line of stitching; supersedes 134 S and 134 D needles.
The appearance of the finished seam and trouble-free sewing greatly depend on the
correct relationship between needle, thread and fabric.
Lightweight fabrics should be sewn with a thin needle in order to avoid ugly needle
punctures.
When thick thread is used in a thin needle, the thread is likely to break, while thin
thread used in a thick needle is likely to cause skipping of stitches.
The table on page 10 is merely intended as a guide for selecting the correct needle size.
134 Vr
From the library of: Superior Sewing Machine & Supply LLC

Pfaff 345 Specifications

General

Brand	Pfaff
Model	345
Category	Sewing Machine
Language	English