Pfaff Automatic 260 User manual

-
260+ 360
•
erv1ce
anual
Functions of Assemblies · Adjustment Procedures
Sewing-off · Trouble Shooting · Electrical Equipment

SERVICE
MANUAL
for Pfaff Sewing Machines 260 and 360
with built-in automatic
embroidery mechanism
Functions
of Assemblies
Electrical Equipment
Adjustment Procedures
Sewing-off
Trouble Shooting
G·M ·PFAFF AG · KARLSRUHE-DURLACH BRANCH

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Foreword
This profusely illustrated Service Manual for Pfaff 260 (360)- 261 sewing ma-
chines is a
valuable source of technical information which is primarily in-
tended
for Pfaff dealers and their service personnel.
It goes i nto greater detail and, thus, complements the instruction book which
accompanies each machine. The
nomenclature used in the pertinent spore
ports
catalogue has also been used throughout this book. Numerous photo-
grap hs and draw ings are interspersed in the text in order to give users a
good i deo of the assembli es being discussed.
Beg i nning with a general description of the workings of a sewing machine,
the
monual proceeds to discuss how the zigzag and automatic mechani sms
function. The adjustment procedures wh i ch follow ore intended for those of
our dealers who hove to remedy sewing trou ,bles that may occur occasionally.
The prime object of this manual is , howeve r, to import additional technical
knowledge to all who ore connected with the sale and repo ir of the Pfaff
260 (360)- 261 and to enable them to render satisfactory service.
G. M. PFAFF AG

CONTENTS
Foreword
How a Sewing Machine Functions .
TheNeedle . .
The Sewing
Hook . . . .
St itch Formation and Feed Motion
The Take-Up lever .
The
Feed Dog .
Dropping the Feed Dog
Stitch length Regulation
Reverse
Sewing . . . .
Regulating
the Thread Tension .
The Bobbin
Thread Tension .
Regulat i ng the Thread Tension .
The
Needle Thread Tension
W i
nding the Bobbin .
Inserti ng the Bobbin Case
Needle and Thread Chart
Threading the Needle .
Zigzag Sewing .
The
Zigzag Mechan i sm .
The Fi nge r-Tip Contro l . .
Changing the Needle Positi on . . . .
Mechan i cal Principle of Automatic Machines .
Mechan i cal Principle of the Pfaff -261 Automatic
The Electrical Equipment . . . . .
Suppress i on of Radio and TV Interference .
The
lighting System
The Electric Drive .
Multi-Voltage Motors for Pfaff 260 and 360 Machines
Maintenance
Storing Sewing Heads and Cabinets
Checking Cabinets and Stands . .
Attaching
the Bedplate Extension .
Mount ing the Sewing Head
Removing the Rust-Preventative Fluid
Cleaning and O iling
Removing the Top Cover
Cleaning the Feed Dog and the Sewing Hook
Removi ng and Replacing t he Face Cover
The Needle Threader
Stitching off the Machine
Checking t he Automa~ic Mechanism
Regul
at ing the Pressure on the Materia l
Threading the Machine for Two-Need le Work
Preparing the Machine for Two-Needle Decorative Sewing
Rules Your Cust
omers Should Know
Adjustment Procedures .
The Feed Eccentric .
Page
7
7
8
11
12
12
13
13
14
15
15
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17
17
18
19
20
20
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23
29
31
32
33
35
36
36
37
37
37
38
38
38
39
39
42
42
43
43
44
44
45
46
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Page
The Upper Driving Belt Sprocket 46
The
Needle Vibrating Eccentric Bevel Gear . 47
The Driving Eccentric
for the Automatic Mechanism 48
Timing the Sewi:ng Hook 48
Pfaff 260- Needle Bar Rise 49
The
Upper Driving Belt Sprocket 50
Pfaff 360- Needle Bar Rise . 51
Exchanging the Sewing Hook in the Pfaff 360 52
The Position
Finger Brocket . . 52
Setting the Needle Bar at Correct Height . 53
Adjusting
the Feed Dog in the Feed Slot . . 53
Setting
the Presser Bar and the Feed Dog at Correct Height 55
Dismantling, Replacing
and Adjusting tne Stitch length Control 56
Adjusting
the Bobbin Winder . 57
Setting the Needle Threader 58
Changing the Thread Check Spring 60
Changing the Cord Belt . . . . . . . . . 61
Assembling and Adjusting the Zigzag Regulator Mechanism 63
The Zigzag Regulator Mechanism . 64
Stripping the Automatic Mechanism 64
Dismantling the Stitch Width Control 64
The Stitch Width Regulating Mechanism in the Machine Arm 64
The Stitch Width Control 65
Adjusting the Stitch Width Control . 66
Rough Adjustment
of Zigzag Stitch . 67
Fine Adjustment of Zigzag Stitch 67
Zeroing the Needle for StraightStitching 67
Adjusting the Needle Position . . 68
Centering
the Needle in the Needle Plate Slot 69
Converting a Pfaff
260 (360) into a Pfaff 260-261 (360-261) 71
Installing the Automatic Mechanism 71
Mounting the Engaging levers . 71
Essential Parts of the Pfaff (-261) Automatic 73
Mounting the Pressure Spring Assembly 75
Adjusting
the Engaging levers . 75
Replacing
the Top Cover . . . . . . . . . 76
Checking the Needle Position in Relation to the Needle Plate Slot 76
Testing the Performance of the Automatic Mechanism . 77
Checking the Operation of the Engaging levers 77
Eliminating Troubles in Automatic Sewing . 77
Installing a PE 260 or 261 Motor into the Pfaff 260 (-261) 79
Changing the Motor Belt 81
Trouble Shooting . . . . . . . . 81
Dismantling and Reassembling the Pfaff Hook . 84
Works
of the Pfaff 260-261 . • 85
TheTwo-Position Presser
Bar lifter . 86
The PfaffTool
Kit . . 86
Abridged Adjustment Procedure for the Zigzag Regulator Mechanism of
Pfaff 260 (360) Machines 87

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How a Sewing Mact.ine Functions
Household sewing machines all make the conventional lockstitch. This type of
stitch consists of on upper (needle) and a lower (bobbin) thread locked together·
in the material being stitched. The lock of threads is pulled to the middle of
the fabric so that the seam has the same appearance top and bottom.
Every sewing machine designed to produce this type
of stitch must hove the
following component ports and assemblies:
1. a needle
2. a sewing hook, complete with bobbin case and bobbin
(typical of any lockstitch sewing machine)
3. a take-up lever
. 4. an upper and a lower tension mechanism
5. a feed dog
6. Stitch forming and feeding mechanisms
7. a bobbin winder.
The Needle
In contrast to the hand sewing needle, the machine sewing needle has the eye
near its tip. It penetrates the material at every stitch, carrying the thread
down through the hole it has mode in the fabric. As it rises after reaching
the lowest point
of its stroke, the thread bulges out on the short-groove side
of the needle to form a loop above its eye. This loop is entered ot the correct
time by the point
of the shuttle or sewing hook (figs. 1 & 2).
l 1
Fig. 1 Fig. 2
Sewing machine needles are available in many different varieties and sizes,
and are classified into several groups, or systems.
7

Fig . 3
Needle System 130 R
(Needle size, e. g.
No . 80, 90 or 1()()_
given in hundredths of
millimeters)
F = Flat side of shank
L =Length
of needle
St= Needle size (shaft diameter)
I = long groove
k = Short groove
H =
Scarf (cleoronce cut)
S = Point
0= Eye
Fig. 4 Fig. 5 Fig. 6
Pfaff domestic sewing machines normally use System 130 R needles with flat
shank
and scarf (Fig. 4). System 130 B round-shank needles are used for cord-
ing and two-needle fancy stitching. Make sure you use only "ORIGINAL
PFAFF " needles (see a ls o page 81 ).
Needle sizes are determined by the shaft diameter (St in Fig. 5) and ore
measured in hundredths of millimeters. A No. 100 needle, for example, has a
blade diameter of
100
/Joo, or one, millimeter.
Opposite the flat side of the shank, a long groove extends all the way down
to the needle eye. On Pfaff zigzag and automatic sewing machines, this
groove must face toward the operator always. The scarf, or clearance cut,
marked H
in Fig. 4 then faces toward the sewing hook.
The correct relationship between needle
and thread size may be seen from the
Needle and Thread Chart on page 18.
The Sewing Hook
The functions of the sewing hook are (1) to enter with its point the needle
thread loop which forms at the needle eye as the needle ascends, (2) to en-
large this loop, and (3) to pass it around the stationary bobbin case (Fig. 6).
'
There are different types of loop takers, the most popular of which ore:
a. Shuttles that move in a race and are driven by a shuttle driver, such as the
central-bobbin, or oscillating, shuttle d·epicted in Fig. 7, and
b. Sewing hooks which ore carried on a shaft and revolve freely.
8

fig . 7 Oscillating shuttle Fig. 8 Rotary hook with floating bobbin case
1 = Shuttle race (cut -away view) 4 = Bobbin case 1 = R otary hook 2 = Bobbin case
3 = Shuttle 8 = Shuttle driver 3 = Retainer
Fig. 9 Rotary hook with
stationary
11 bobbin case
1 = Hook gib
2 = Hook point
3 = Hook shaft
4 = Bobb<n case bose
5 = Sewing hook
8 = Bobbtn
case cop
9 = Center stud
10 = Bobbin case latch
11 = Bobbin case position fi nger
brocket
12 = Bobbin case position finger
The rotary sewing hooks mentioned under b. above are incorporat ed in
modern sewing machines in two varieties, known as:
a. The rotary hook with floating bobbin case. Th is type of sewing hook, as
the name
implies, features a bobbin case which floats in the hook bowl
and is kept from falling out by a retainer (Fig. 8).
b. The rotary hook with stationary bobbin case. The bobbin case of this type
hook features a ring-shaped flange which runs in an annular groove, or
raceway, cut into the hook bowl. It is held in place by a hook gib so that
it
cannot fall out while sewing. The bobbin case cap is pushed on the
center stud in the bobbin case base (Fig. 9) .
e c h b g
f i gs . 10- 14
9