Contents Page
Preface and General Safety Instructions
Part 1: Operating Instructions Class 667 – Original Operating Instructions
(Edition 12/2011)
1 General safety............................................................................................................................................. 1
2 Product description.................................................................................................................................... 3
2.1 Product description ..................................................................................................................................... 3
2.2 Proper Use, Designated use ........................................................................................................................ 3
2.3 Specifications .............................................................................................................................................. 3
2.4 Optional equipment ..................................................................................................................................... 5
3 Operation..................................................................................................................................................... 7
3.1 Threading the needle thread ....................................................................................................................... 7
3.2 Adjusting the needle-thread tension ........................................................................................................... 8
3.2.1 Function of the main thread tension and the supplementary thread tension in relation to the sewing foot
lift for subclass 667-180312 and 667-180322 ............................................................................................. 9
3.2.2 Function of supplementary thread tension in relation to the sewing foot lift and the Speedomat for
subclass 667-180312 and 667-180332........................................................................................................ 10
3.3 Opening the thread tension ......................................................................................................................... 11
3.4 Turning the supplementary thread tension on and off for subclasses 667-180312 and 667-180332 ........ 11
3.5 Adjusting the thread regulator ..................................................................................................................... 12
3.6 Winding on the hook thread ........................................................................................................................ 13
3.7 Changing the hook-thread bobbin .............................................................................................................. 14
3.8 Setting the hook thread tension .................................................................................................................. 15
3.9 Changing the needle ................................................................................................................................... 16
3.10 Lifting the sewing foot ................................................................................................................................. 17
3.11 Locking the sewing feet in an elevated position ......................................................................................... 18
3.12 Sewing foot pressure ................................................................................................................................... 18
3.13 Sewing-foot stroke ...................................................................................................................................... 19
3.14 Adjusting the stitch length ........................................................................................................................... 21
3.15 Key pad on the machine arm ...................................................................................................................... 22
3.16 Sewing with machines using the Efka DC1550/DA321G positioning drive ................................................ 24
4 Maintenance................................................................................................................................................ 27
4.1 Cleaning and inspection .............................................................................................................................. 27
4.2 Oil lubrication ............................................................................................................................................... 29
