Seiko CH-2-RF Operating Instructions Manual Download Page 1 | Manualshive

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From the library of: Superior Sewing Machine & Supply LLC

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Summary of Contents for CH-2-RF

Page 1: ...Operating Instructions For CH Series CH 2B CH 2B DF CH 6B CH 7B CH 8B CH 2 RF f h SEIKO SEWING MACHINE CO LTD TOKYO JAPAN From the library of Superior Sewing Machine Supply LLC ...

Page 2: ... Lockstitch Oscillating large hook CH Type 240 x 30 3 width Cotton or synthetic fiber SB Needle upper lower feed reverse feed 7B Needle Lower feed reverse feed 6B Lower feed reverse feed 2B Upper lower feed reverse feed 2B DF Upper lower feed reverse feed Capable of intermediate shirring Max 10mm SB Alternating foot walking foot presser foot 7B Flat foot 6B Roller foot or flat foot 2B Alternating ...

Page 3: ... Feed Dog Height 7 C Adjusting theForward and Backward Position of q Needle BarFrame D Timing of Needle and Hook 8 Positioning of needle and tip of the hook 9 Adjusting the height of needle bar 9 Adjusting the position of the tip of hook 9 Clearance between needle and tip of hook 9 Each timing for up down strokes of presser 10 foot 2B SB Types only 13 CH 2B DF 11 a Use of the Differential Feed Mec...

Page 4: ... eye ofthe needle in line with machine arm directly Securely tighten itwith needle clamp screw 1 3 Thread For needle Upper thread use left twisted thread only and for bobbin Lower thread use either left orright twisted thread To find out thread twist hold the thread as shown by illustgation and turn the thread overtowardyou betweenthe thumb andforefinger ofright hand and then left twistedthread wi...

Page 5: ... out of the bobbin case Insertion of Bobbin When inserting pull out the thread and depress it then insert the bobbin 4 in the bobbin case 5 Pull the thread upward passing through the thread slit 7 of the bobbin case Youcan pull out the thread through the thread passing hole through underneath the tension spring 6 Make sure that the snap spring in the shuttle is clicked after pressing bobbin case i...

Page 6: ...e bobbin winding lever A Winding volume should beadjusted bythe screw 7 and positioning ofthe moving lever 6 6 Upper Threading Upper threading should be made by the following order I Spool pin 2 Thread guide ofthread tension 3 Clearance oftwo tension discs 4 thread guideofthreadtension 5 Thread controller disc wind a time 6 Thread guide 7 Tension spring 8 Thread take up 9 Thread guide face plat 10...

Page 7: ...read Tension n To adjust tension of needle thread turn Tension Regulating Thumb By turning the knurling nut clockwise needle thread tension increases By turning the knurling nut counter clockwise needle thread tension decreases Adjusting Bobbin Thread Tension To adjust tension of the bobbin thread turn Tension Regulating Screw By loosen set screw 1 and adjusting tension regulating screw 2 The set ...

Page 8: ...itch Length By pull up t feed regulating lever 1 reverse stitch is performed and push down feed I regulating lever 1 forward stitch is performed By turning knurling nut 2 3 clockwise feed length decreases and turning knurling nut 2 3 counter clockwise feed length increases Knurling nut 2 3 should be tightened each other after desired stitch length was determined Note When upward downward moving of...

Page 9: ...Removal of Shuttle Race Body Tighten the shuttle race back spring screw 1 then loosen and take off the two shuttle race screws 2 and remove the shuttle race body and shuttle hook Note In case of the removal of shuttle race body without tightening of shuttle race back spring screw 1 shuttle race back and shuttle race back spring may run out and or may difficult to set the shuttle race body The shut...

Page 10: ... 3 Needle dropping point is to be set at the center of needle hole of the feed dog n Note Feed upper shaft connector A 4 is fixed and the screw 3 is tightened for the prevention of the moving of leftward and rightward B Adjusting of Feed Dog Height Taking off the needle in 7B and 8B The height of feed dog is adjusted 1 3mm 1 5mm above the surface of the throat plate at the lowest point of needle b...

Page 11: ...he tip of the hook should meet the center Line of the needle 2 5imD 3nn U 4 5inD 5 5min Distance between the upper tip of the needle eye and the tip of the hook shall be 2 5mm 3mm Adjusting the height of needle bar Loosen the screw of bar connecting stud 2 by wrench which inserts to the hole 1 of arm and adjust the needle bar 3 upward and downward Adjusting the position of the tip of hook Loosen t...

Page 12: ...turn the balance wheel determines smooth position of the needle bar and adjust the clearance between needle and tip of the hook After determination of the clearance tighten the set screw 2 of the needle bar rock frame hinge stud and then put the needle bar rock frame hinge stud small 4 to slightly the needle bar rock frame position bracket 8 And put the needle bar rock frame hinge stud large 6 to ...

Page 13: ...e lifting eccentric connection crank pinch screw 2 is to be adjusted Adjustment is to be made by the materials being sewn c Up down strokes of walking foot and presser foot is loosened by the screw 3 and up f the screw 3 the stroke increases down I the screw 3 the stroke decreases s a Use of the Differential Feed Mechanism Pull down the chain 1 upper feed volume increases by maximum 80 against low...

Page 14: ...es Turn the stopper screw 3 counter clockwiseupper feed length decreases Note Over turning of stopper screw 3 stopper nut 4 counter clockwise will cause the troubles that the top of feed adjusting lever touch with the feed upper shaft connector CH 2 DF Adjusting Upper Feed Length 1 Coarse stitch of upper feed length can be performed by pull down the lifting lever A regardless of lower feed r A nB ...

Page 15: ...se of unifying of shirring amount and or general sewing equivalent with lower feed pin D should be fixed by pinching B C Fig d Adjusting Lower Feed Length Loosen the feed adjusting nuts A B and turn them clockwise feed length decrease and turn them counter clockwise feed length increase After adjustment the lever should be pulled down exactly then operate the machine on the condition that nut A to...

Page 16: ...attle or the leftward rightward of the upper feed arm C Adjusting Up Down Amount ofUpper Feed Loosen nut A turn the adjusting screw 8 a clockwise up down amount decrease turn it b counter clockwise up down amount increase After adjustment nut A should be tightened exactly 14 Wrong K More than A B From the library of Superior Sewing Machine Supply LLC ...

Page 17: ...of Presser Bar Clearance between upper feed arm C and presser bar guide should be 1 5mm Lay E F on arm clearance between F and G should be 2mm Clearance H should be more than 3mm From the library of Superior Sewing Machine Supply LLC ...

Page 18: ...m 21 7 Asakusa 1 chome Taito ku Tokyo 111 Japan Osaka Branch 5 10 Terada cho 2 chome Tennoji ku Osaka 543 Japan Show Room 5 10 Terada cho 2 chome TennojI ku Osaka 543 Japan Tel 03 3872 6173 4 Export Dept Telefax 03 3873 6596 Tel 03 3872 6493 Tel 06 779 7578 Tel 06 779 7578 96033000 E From the library of Superior Sewing Machine Supply LLC ...

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