Instruction manual

Contents Page:
Preface and general safety instructions
Part 1: Operating Instructions Class 868 – Original Instructions
(Edition 03/2011)
1 Product description ............................................ 5
2 Designated use ............................................... 5
3 Subclasses .................................................. 6
4 Optional equipment ............................................. 8
5 Technical data
5.1 Technicaldatasubclasses......................................... 11
6 Operation
6.1 Threadingtheneedlethread........................................ 13
6.2 Adjustingtheneedle-threadtension................................... 15
6.2.1 Function of the thread main tension and the thread supplementary tension in relation
tothesewingfootlifting .......................................... 16
6.2.2 Reparationseamwiththreadtensionalwaysclosed ......................... 16
6.2.3 Function of the thread’s supplementary tension in relation to the stroke adjustment
andtheSpeedomat ............................................. 17
6.3 Openingthethreadtension......................................... 17
6.4 Shortstitch .................................................. 18
6.4.1 Shortstitchattheseambeginning.................................... 18
6.4.2 Shortstitchattheendofaseam..................................... 18
6.4.3 Shortstitchattheseambeginningandseamend........................... 18
6.5 Switching the supplementary tension on and off with machines without thread trimmer .... 19
6.6 Adjustingthethreadregulator....................................... 20
6.7 Winding on the hook thread ........................................ 21
6.8 Changing the hook-thread bobbin .................................... 22
6.9 Setting the hook thread tension ...................................... 23
6.10 Insertingandchangingtheneedlewithsingle-needlemachines.................. 24
6.11 Insertingandchangingtheneedlewithdouble-needlemachines.................. 25
6.12 Liftingthesewingfoot............................................ 26
6.13 Lockingthesewingfeetinliftedposition ................................ 27
6.14 Sewing-footpressure............................................ 27
6.15 Sewing-footstroke.............................................. 28
6.16 Settingthestitchlength........................................... 30
6.17 Keypadonthemachinearm........................................ 31
7 Sewing drive and operating panel ................................... 32
8Sewing..................................................... 33