JUKI MF-7800D Series, Engineer'S Manual

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1. Installing the air-blow wiper
(1) When using air-blow wiper , remove the top covering thread
trimmer device.
(2) Tighten air-blow wiper with setscrews .
Perform piping referring to “Air piping drawing”.
2. Adjusting the air-blow wiper
Adjust the air-blow position of air-blow wiper .
(1) Adjust so that the air outlet of air-blow wiper is positioned in the
rear of needle and slightly on the lower side of needle eyelet of the
left needle when the needle bar is in the position.
(2) After the adjustment, temporarily tighten setscrews .
(3) Supply air from the air compressor and turn the power ON.
(4) When the back part of the pedal of sewing machine is depressed,
the presser goes up and simultaneously air blows from air-blow
wiper . Re-adjust the position of air-blow wiper so that air blows
only to the needle thread in the rear of the needle eyelet.
(5) After the re-adjustment, tighten setscrews .
(Caution) 1. When air blows in front of the needle, needle thread
slips from the needle eyelet. So, be careful.
2. Adjust the air-blow strength with speed controller
.
3. Hand wheel may rotate up to the fixed position when
turning ON the power. So, be careful.
Adjustment Procedure
Results of Improper Adjustment
UT24