Singer 251 Manual do Utilizador

Tlrm 20549r:ev. (557)SERVICE MANUALANDPARTS LISTFORSINGERMACHINES OF CLASS 251SINGLE NEEDLE LOCK STITCHAUTOMATIC OILING SYSTEM£275Si?CAUTION—See that

10UPPER THREADINGFig. 10. Upper ThreadingFirst, turn the machine pulley over toward the operator until needle is at Its highest point,

11TO REMOVE THE BOBBIN1. MOVE TAKE-UP TO HIGHEST POINTTurn machine pulley over toward operator, until needle thread take-up lever is at hi

See Fig. 1512TO WIND THE BOBBINFasten bobbin winder to table with its driving pulley in front of the machine belt, as shown above, so

13TO THREAD THE BOBBIN CASEHold the bobbin so that the thread will unwind in the direction shown in Fig. 16.Hold the bobbin case as shown In Fig. 16 a

14TO REPLACE THE BOBBIN CASE TO PREPARE FOR SEWING1. REPLACE BOBBIN CASE ON STUDV3. PRESS BACK UNTIL LATCH CATCHES GROOVE IN STUDFig. 20. Drawing Up t

15TENSIONSFor ordinary stitching, tension on needle and bobbin threads should be balanced so that, if you cut straight down through

16TO REGULATE THE LENGTH OF STITCHCAUTION: DO NOT ATTEMPT TO CHANGE STITCH LENGTH WHILE MACHINE IS RUNNING.1 ;; ^ tP ;R, E S SiPLUNGER2. TURN PULLEY

17TO REGULATE THE PRESSURE ON THE MATERIALMOREPRESSURELESS PRESSUREL------JFig. 27. Regulating the Pressure on the MaterialThe correct presser foot

в18ТО SET THE NEEDLE BAR AT THE CORRECT HEIGHTнк)!UPPERTIMINGNEEDLE BAR ATLOWEST POINTIм/с 25I-I .484 inchM/C25I-2 and 25I-3 .195 inchUPPER TIMING MAR

19HEIGHTTO SET CHECK SPRINGTENSIONHrOHERLOOSEN\ /H/£;Fig. 30. Setting Height of Check SpringPREPARATION:Thread the machine.CHECK:Turn machine pulley

FIG. 2. X-RAY VIEW OF MACHINES OF CLASS 251 (LUBRICATING SYSTEM SHOWN IN SOLID BLACK)FOREWORDThis book contains complete information covering op

20TO SET THE PRESSER BAR AT THE CORRECT HEIGHTRESTINGFIRMLYUPONTHROATPLATEE27555Fig. 32. Checking Height of Presser BarFig. 32A. Required Clearance on

21TO TIME THE SEWING HOOKLOWERTIMINGMARKLOWERTIMINGMARKONUPWARDSTROKEFig. 34A. Checking the Tinning of the Hook on Machines with Tinning Marks at Lowe

22TO SET THE SEWING HOOK SIDEWISE IN RELATION TO THE NEEDLE...clf®É'"-/ ^ " • . •m:POINT|S3SffFig. 36. Hook Point Passing thè Needle

23mIri-IIIloosen r DAMAGESET SCREW ^BRASS DRIFT PINTAPlightlyF'g. 39. Moving Sewing Hook AssemblyToward the NeedlefDO NOT HIT BRIDGETAPlightly/?

24TO TIME THE FEEDBefore the machine leaves the factory, the feed lifting eccentric-and-bevel-gear and the feed eccentric are both set

25TO SET THE FEED DOG AT THE CORRECT HEIGHTFULL DEPTH REAR TEETHTnnnnTHROAT PLATEFig. 42. Showing Feed Dog at Correct HeightWhen the feed dog is

27INSTRUCTIONSFORREMOVAL AND REPLACEMENTOFPRINCIPAL ASSEMBLIESCAUTION TO MECHANICSMachines of Class 251- are made with extreme precision in

28TO REMOVE THE SEWING HOOK143350S2ZH2F2Fig. 45. Removing Sewing HookFig. 46. Replacing Oil FilterRemove the needle, slide plate, throat plate

29TO REPLACE THE SEWING HOOKJ2E2Fig. 47. Replacing Sewing Hook (Correct Position of Thread Guard and Bobbin Case Holder)When placing a new sewing

Machines of Class 251 produce top quality, straight-line, single-needle, lock stitching in fabrics as fine as ladies' lingerie or as heavy as men

30TO REMOVE AND REPLACE THE HOOK SHAFTHOLD GEARS IN MESHFig. 48. Removing and Replacing Hook ShaftRemove and replace the hook shaft in the following

31THE OIL PUMPTO REMOVE1. Loosen the two oil pipe clamping sleeve nuts 52, Fig. 49.2. Remove the four screws N2, Fig. 48.3. Remove the sc

32TO REMOVE AND REPLACE THE UPRIGHT ARM SHAFT(See Fig. 50)REMOVAL;If it is found necessary to remove the upright arm shaft K3, it should

33TO REMOVE AND REPLACE THE NEEDLE BAR(See Fig. 51)Fig. 51. Removing and Replacing Needle Bar and Presser BarRemove the needle bar in the following ma

34TO REMOVE THE NEEDLE THREAD TAKE-UPH3DO NOT DISTURBDO NOT DISTURB U2Fig. 52. Removing Needle Thread Take-up Fig. 53. Needle Bar CrankRemove needle

35TO REPLACE THE NEEDLE THREAD TAKE-UPReplace the needle thread take-up in the following manner:1. Make sure that the wearing plate J3 is in

36TO REMOVE AND REPLACE ARM SIDE SHIELD WICK, NEEDLE BAR WICK AND NEEDLE BAR CONNECTING STUD WICK(See Fig. 54)Arm side shield wick may be remdve

37TO INSTALL NEW OIL WICK HOLDERFig. 56. Replacing Oil Wick Holder (Correct Installation)WICKNOT REACHINGFig. 57. Incorrect InstallationFig. 58. Incor

38OIL-REMOVING WICK ASSEMBLY (HEAD END) COMPLETE T 47056lr%\Fig. 59. Preparing to Remove Oil-Removing WickFig. 60. Removing Oil-Removing Wick Assembly

39OIL-REMOVING WICK ASSEMBLY (continued)RELEASE SPRINGSLIP SPRINGFig. 61. Disassembly of Oil Removing Wick (Showing Oil-Removing Wick) Wick Holder Bod

SPECIAL CHARACTERISTICS OF MACHINES OF CLASS 251MACHINES (CLASS AND VARIETY)251-1251-2 251-3251-3 (HEAVY)TYPE OF MATERIALLight-WeightMedium-Heavy to L

40OIL-REMOVING WICK ASSEMBLY (continued)«Ip ' ‘¥§ I Hi\ ^ ‘.i- ®E'-'''5.’ Ji;‘'XBf fiiii iSLIDEINTORECESSPULLWICKFig.

41OIL-REMOVING WICK ASSEMBLY (continued)ifMlm IIIIIBil'smi1 .«w»« J'N-Fig. 65. Location of Wick Loop and Wick End in Machine HeadFig. 66. R

42THE ARM SHAFTT4Fig. 67. Loosening the Feed EccentricREMOVAL-(See Figs. 67 to 69)7. Loosen the four screws in the arm top cover and remove the arm t

43THE ARM SHAFT (continued)Z4X4iFig. 68. Removing the Arm ShaftREMOVAL (Continued)CAUTION: The feed-timing-bevel-gears at S3, Fig. 68 have been

44THE ARM SHAFT (continued)S3HOLD THESE GEARS IN MESHFig. 70. Replacing the Arm ShaftREPLACEMENT-(See Fig. 70)CAUTION: Make certain that the OIL-

SETTING UPTABLECUT-OUTFig. 3. Installation of Machine on BaseFig. 4. Installation of Knee Lifter on Machine BaseWhen shipped, the base is held t

LUBRICATIONTURN BACK MACHINENEVER ALLOW OIL TO FALL BELOW LOW MARKFILL TO HIGH MARKFig. 5. Oil ReservoirFig. 6. Oil Flow WindowMachines of Class 25

ADJUSTMENT OF ROTATING HOOK OIL FLOW REGULATORFig. 7. Oil Flow Regulator in Hook Shaft BushingThe sewing hook is automatically lubricated. The f

NEEDLESThe size of the needle to be used should be determined by the size of the thread which must pass freely through the eye

THREADOn Machines of Class 251- use only left twist thread in the needle. Either right or left twist thread can be used in the bobbin