Loading ...
Loading ...
Loading ...
_, tIM 18
2Ct, J CHICXI#_ TIM/N_ AND WIDTH OFZIGZAG
CHECKING ZIGZAG TIMING
• Z,gtag timing rseo.eet d needlestartsits side muttonwhends tip is 340 inch185 mmlabovethe
needle place Th_smeasurementis taken when the needleishemgraisedtoward,is upperposlllon
Cheek th_s measurementas follows
• Posmon needle plate for llgzag shtchmg
• Install o site 14 needle
• Turn the machine "'off" and program it for _lgtog _,htchmg at maxlmnm width
• Lower feed dogs
•Mauually relate the handwhenltoward youat least one complele Into Iheo stopwllh needle m
eppei position
• Place !lange No 68931 on needle plate Mal,.esure thai gaugets dnectlycenteredover zigzag
needle hole as shown m Figu/e 27a
• Mannally rotate handwheeltoward youandobservethai needlepassesoverthe secondstepof lhe
qaugewithout lunchingit (Figure27a! Then.slide the gaugetoward the front of the machine,so
thal the thirdstepis posillonndunder the needle The side mohooof the needleshouldDO,Sothe
qauge to hp over when hondwheelis being rotated fFigute 27b!
/
No 611931
Red mark
FIGURE 27a
FIGURE ?Tb
_m.IO01100
2C.2.$ CHECKINDTIMINDAND WIDTHOf EIDZAI_
2. ADJUSTINGZIGZAGTIMING
• TOadjust, sbghtly loosen screw IA) of lever (BI on nlarhme lower shaft iFI IFiq,te 28J Rotate le_er
(8) on the shaft to obtain the correct sethng Recheck needle b_te with qanqe Nn 68931 V_eu
selling _s correct, hghten screw (AI seenrely
• Remove gauge and turn off the nlachme
• Rotate handwheel and check the clearance between board and magnet ICJ thgute 28r The
clearanceshouldbe 012 040 inchbetween magnet(C) and eachof the two magmstors(01and
(El Checkthusclearance with feeler gauges
• Recheckneedle bite nsmg gauqe No 68931
E A
E]
t
F O C B
FIGURE 21
3. CHECKING ZIGZAG WIDTH
• Maximnm zlgtag wndth 180 ore readouti should allow lhe needle a balebelweeu 7 .5 a.d 78
mdhmntnrswhen uncrated mammgy wdh the handwheel
• To veery this positionneedle plate for ,,_pzagshlrhmg
• Install a number 14 needle
• Lower feed dogs
• Turn mach,ne "on' and program for w_desr,,ig._aqshlrh
• Cheek needle b,te clearance nsmg gauge No 68931 iFimlr_,Z71
• Manually retain handwheeltoward yovthrmJghone completet,gtag cycle andobserveneedle bar
holder(A) and pivot IB) (Figure 29) The clearanees betweenpivot (81a_d each of ttze hmdmg
demons(CI mustbe equal Alsohinder ICI nlUSlbe 020 032 mehes belov,holderIA)/Ftqute 29_
Check €lemonces with leeler gauges
• If adlustmentis feqmred loosenscrew(OI sl,(Ihllyandrotate Imuts Afteradl.slmenl hqhten,_rlew
IO) securely and recheck clearances
A B
DC
FIGURE29
Loading ...
Loading ...
Loading ...