Name: JUKI MF-7900 Series
Brand: JUKI
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70002000

No. E406-01

ENGINEER’S MANUAL

MF-7900 Series

High-speed, Cylinder-bed Top and Bottom Coverstitch Machine

MF-7900D Series

High-speed, Semi-dry-head, Cylinder-bed Top and Bottom Coverstitch Machine

Table of Contents13
Specifications15
Configuration of the Machine Components16
Motor Pulley and Belt17
Standard Adjustment18
Threading the Machine Head18
Adjusting the Rocking Thread Take-Up20
Adjusting the Needle Thread Loop by the Eccentric Cam22
Adjusting the Position of the Needle Thread Guide Rod24
Adjusting the Position of the Thread Receiver26
Adjusting the Position of the Spreader Thread Guide and Spreader Thread Take-Up28
Adjusting the Spreader30
Adjusting the Timing Relation between the Looper and Needle Bar34
Returning Amount of the Looper36
Height of the Needle38
Locus and Longitudinal Motion of the Looper40
Adjusting the Needle Guard42
Adjusting the Feed Dog46
Adjusting the Feed Relation52
Adjusting the Presser Foot56
Adjusting the Micro-Lifter58
Adjusting the Looper Thread Cam60
Adjustment Value of Balloon62
With Regard to Lubrication64
How to Change Needle Bar Stroke68
How to Change the Spreader72
MF-7500 Series/Mf-7900 Series How to Use the Timing Gauge74
UT51, 52 (Solenoid Type Thread Trimmer)76
Installing the SC-92176
Adjusting and Setting SC-92177
Adjusting the Looper Thread Trimmer Mechanism82
Adjusting the Top Covering Thread Trimmer Mechanism94
Adjusting the Needle Stop Position at Thread Trimming96
UT55, 56, 57 (Pneumatic Type Thread Trimmer)98
Installing the SC-92198
Piping of the Thread Trimmer Device100
Adjusting the Looper Thread Trimmer Mechanism102
Adjusting the Top Covering Thread Trimmer Mechanism104
Adjusting the Air-Blow Wiper (UT56)106
Adjusting the Needle Thread Wiper (UT55)108
Adjusting the Needle Stop Position at Thread Trimming110
H22, 23 (Hemming Type (with Left Hand Fabric Trimmer))113
Specifications113
Adjustment114
MC37, MC40 (Pneumatic Cloth Chip Suction Device)121
Specifications and Features121
Installation and Adjustment122
PL12, 13 (Cloth Puller)133
Specifications133
Installation and Adjustment134
Mf-7900-E11142
Specifications142
Adjustment Procedure of Engagement Amount of Knives142
Adjustment Procedure of the Knife Pressure143
Adjustment Procedure of the Knife Cutting Position143
Adjusting the Engagement Angle of the Knife144
Replacement Procedure of the Moving Knife and the Counter Knife145
Adjustment Procedure of the Cloth Guide145
Adjustment Procedure of Front-Up Amount of the Presser Foot146
Adjustment Procedure of the Position of the Tape Guide146
Installing the Accessories (Tape Guide Base, Tension Roller and Suction Pipe) Supplied with the Machine147
Adjusting Procedure of the Position of the Tension Roller149
Adjusting Procedure of the Position of the Tape Guide Base151
How to Use the Knife Cancelling Mechanism155
Mf-7900-E22/23156
Specifications156
In Case of Using E22156
Installing Procedure156
Adjustment Procedure159
In Case of Using E23160
Installing Procedure160
Adjustment Procedure162
With Regard to the Accessories (Tension Roller)163
Installing Procedure163
Adjustment Procedure164
Mf-7900/Ut59166
Specifications166
At the Beginning166
Installing the Accessories167
Installing the Air Regulator167
Installing the Manifold167
Connecting the Cords168
Setting Procedure of the Machine Head169
Air Piping Drawing170
Piping of the Thread Trimmer Device170
Adjusting the Air Regulator170
Threading the Machine Head171
Adjusting the Looper Thread Trimmer Mechanism172
Adjusting the Looper Thread Trimmer Air Cylinder172
Adjusting the Engagement of the Lower Knife172
Initial Position of the Looper Thread Trimmer Mechanism173
Longitudinal Position of the Blade Point of Lower Knife174
Adjusting the Height of the Lower Knife174
Adjusting the Stopper175
Adjusting the Thread Trimmer Sensor176
SS Lever Unit177
Installing the SS Lever Unit177
Adjusting the SS Lever Unit177
Setting the Upper Stop Position of the Needle Bar178
Setting the Raveling Prevention Parameter180
Adjusting the Thread Hook181
Other Cautions184
MF-7900D Dry Section184
Application of Appropriate Grease184
Adhesives Application Spots186
Troubles and Corrective Measures187
Drawing of Table203
Semi-Submerged Type for the V-Belt Type204
Semi-Submerged Type for the Direct-Drive Type206
H22, 23 Table-Mount Type for the V-Belt Type207
H22, 23 Semi-Submerged Type for the V-Belt Type208
H22, 23 Table-Mount Type for the Direct-Drive Type209
H22, 23 Semi-Submerged Type for the Direct-Drive Type210
E11/E22/E23 for the Direct-Drive Type211
E11/E22/E23 for the V-Belt Type212
H22/H23-UT59 Semi-Submerged Type for the Direct-Drive Type213
U11-UT59 Semi-Submerged Type for the Direct-Drive Type214

Brand	JUKI
Model	MF-7900 Series
Category	Sewing Machine
Language	English

JUKI MF-7900 Series Engineer's Manual

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