Singer 331K4 User Manual

Form K6542 (365)SINGERSERVICE MANUAL331K1 and 331K4*A Trademark of THE SINGER COMPANYTHE SINGER COMPANY© 1962 by The Singer Company Copyright Under I

101. LOOSENTHUMB SCREW— TO CHANGE STITCH SETTING2. RAISE OR LOWER AS DESIRED.3. TIGHTEN— WHEN DESIRED STITCH SETTING IS OBTAINEDSHORTERLONGERFig. 23.

11THE STOP MOTION DEVICEMachine 331K1 and 331K4 are regularly fitted with solid disc (balanced) machine pulley 139724^ without stop motion

12SPECIFICATIONSThe following gauge distances should be of help to adjusters of these machines:• Height of presser foot above throat plate 5/16 inch.

13TO SET THE NEEDLE BAR AT THE CORRECT HEIGHTPREPARATION:Remove face plate, slide plate and throat plate. See that needle is correctly set in ne

14Fig. 32. Setting Height of Check SpringFig. 33. Adjusting Tension on Check SpringHEIGHT SETTINGPREPARATION:Thread the machine.CHECK:Turn machine p

15TO TIME THE FEEDCHECK:Test feed assembly linkage for freedom of movement. Action of feed dog must be regular and smooth for maximum

16TO CENTRALIZE FEED DOG IN THROAT PLATE SLOTSCHECK:Feed dog should not contact edges of throat plate slots.SIDEWISE SETTING:Feed dog should

The Some !To get replacements that are the same as parts in new machines...BUY PARTS AND NEEDLES MADE BYSINGERSTO BE DOUBLY SURE...of new machine pe

CONTENTSPAGEDESCRIPTION...3LUBRICATION AND CLEANING...4INF

DESCRIPTION MACHINE 331K4:Machines 331K1 and 331K4 produce top quality, single-needle, straight-line lock stitching in suits, shirts, skirt

LUBRICATION AND CLEANINGUse SINGER* OIL, “TYPE B” or “TYPE D”. Use “TYPE D” OIL when an oil is desired which will produce minimum sta

THREADOn Machines of Class 331K, use only left twist thread in the needle. Either right or left twist thread can be used in the bobbi

UPPER THREADINGMOVE NEEDLE BAR TO HIGHEST POINTFig. 8. Upper ThreadingNOTE: Thread unwinder 225258 is recommended for use with these machines.Fi

TO WIND THE BOBBIN(See “STOP MOTION DEVICE” for treadle machines on page 11)Bobbin winder should be fastened to table with its driving pulley

Fig. 17. Perfect StitchTO PREPARE FOR SEWINGHold slack end of needle thread loosely and turn machine pulley over toward you until needle

REGULATIONBOBBIN THREAD TENSION:For average sewing, tension on bobbin thread should be very light.To regulate tension on bobbin thread, remove