Singer 306 - Differences in Bobbin Case Holders and Bobbin Cases of Machine 306 and 319

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Table of Contents3
Tips on Setting up4
Order of Inspection of Customer's Machines at the Bench5
Order of Inspection in the Home6
Needle and Threads8
Hook and Needle Relationship9
Chart Shoring Relationship of Types of Fabrics, Thread and Needle Sizes and Machine Stitches to the Inch10
Twist of Thread10
To Order Needles for Swing-Needle Machines11
Description of 306 X 1 Twin Needles11
15 X 1 Needles for Machines of Glass 40111
To Prevent Breaking of Needles11
Location of Needle in Needle Clamp12
Formation of the Lock Stitch13
The Perfect Lock Stitch15
Tension Conditions16
Straight Stitching16
Satin Stitching16
Open Zigzag Stitching16
To Regulate Thread Tensions18
To Remove and Disassemble Needle Thread Tension18
Needle Thread Tension18
To Obtain Increased Tension Range18
To Reassemble and Replace Needle Thread Tension19
To Adjust the Thread Take-Up Spring19
Stroke of Spring19
To Set Take-Up Spring Stroke19
Pressure of Spring20
To Establish Minimum Pressure of Spring20
To Regulate Bobbin Thread Tension21
Bobbin Thread Tension21
To Regulate Bobbin Thread Tension Without Removing Bobbin Case21
Suggested Method of Setting Bobbin Thread Tension21
To Correct the Position of the Needle in Relation to Straight-Stitching Throat Plate22
Machine Set for Straight Stitching at Central Position22
Hints for Adjusters and Mechanics23
Check These Points When a Machine Binds23
When Stitch Regulator Binds23
Check These Points When Machine Breaks Needles24
If Needle Strikes Sewing Hook24
If Needle Strikes Presser Foot24
If Throat Plate Rattles24
To Remove Arm Shaft Connection Belt from Within the Arm25
To Replace Arm Shaft Connection Belt26
Location of Arm Shaft Sprocket27
Care of the Arm Shaft Connection Belt28
To Time the Feed29
Two Methods29
To Set the Feed Dog at the Correct Height30
Full Depth Rear Teeth30
To Adjust the Position of the Feed Dog for Clearance above Hook31
Adjusting Clearance between Hook and Feed Dog31
To Set the Feed Dog in Relation to the Throat Plate Slots32
Sidewise Adjustment32
Lengthwise Adjustment32
Adjusting Feed Dog in Throat Plate Slots32
To Adjust the Stitch Regulator33
Check These Points When Stitch Regulator Sticks, Creeps or Binds33
Stitch Regulating Handle33
Adjusting Stitch Regulator33
To Remove Stitch Regulator Handle34
To Remove Feed Regulator Assembly34
To Replace Feed Regulator Assembly35
To Replace Stitch Regulator Handle35
To Remove a Broken or Faulty Feed Forked Connection Assembly36
To Install a Feed Forked Connection Assembly37
Removing Feed Forked Connection37
To Remove End Play or Binding in Rotating Hook Driving Shaft38
Tests for Binding38
To Remove Hook Driving Shaft39
To Replace Hook Driving Shaft39
To Remove End Play or Binding in the Hook Shaft40
To Set the Position of Hook Point to or from the Needle41
Adjustment for Thread Clearance between Position Finger and Bobbin Case Base42
To Set the Needle Bar Height Indicator42
To Time the Rotating Hook in Relation to the Movement of the Needle43
Sequence of Adjustments to be Verified before Timing Hook43
To Set Needle Bar Height Without Gauge44
To Set Needle Bar Height with Gauge45
To Remove and Replace Needle Bar46
To Remove Needle Bar Holder46
To Replace Needle Bar Holder47
To Check for Looseness or Binding in Needle Vibrating Mechanism48
To Remove End Play or Binding in Arm Shaft49
To Remove End Play or Binding in Arm Cross Shaft49
To Adjust Position of Fashion Disc Follower Frame Stud in Relation to Fashion Disc49
To Remove Needle Bar Pitman and Fashion Disc Follower Frame50
To Replace Needle Bar Pitman and Fashion Disc Follower Frame51
To Adjust Pendulum Setting Position of Needle in Relation to Straight-Stitching Throat Plate and Presser Foot52
To Position Eccentric Stud52
Timing Pendulum Movement of Needle Bar Without Gauge53
To Time Pendulum Movement of Needle Bar Without Gauge54
To Time Pendulum Movement of Needle Bar with Gauge55
To Set the Presser Bar at the Correct Height56
To Regulate Pressure on Presser Foot56
Tests for Squareness of Presser Foot to Feed57
Needle-Perforation Tests58
To Eliminate Needle Vibration with Gauge60
If Needle Vibrates60
Coordinating Extreme Left- and Right-Needle Positions61
Bight62
Bight Limit Screws63
Bight Limit Screw Settings63
Varieties of Stitching and Summary of Controls Obtainable from Bight Control Mechanism64
Straight Stitch, Central Needle Position64
Straight Stitch, Left Needle Position64
Straight Stitch, Right Needle Position64
Straight Stitch Intermediate Positions65
Maximum Zigzag Stitch, Right Needle Position65
Zigzag Stitch, Various Widths, Central Needle Position66
Zigzag Stitch, Various Widths, Left Needle Position66
Zigzag Stitch, Various Widths, Right Needle Position66
To Remove the Bight Control Mechanism67
Zigzag Stitch of Various Widths and at Various Positions of the Needle67
Sub-Assembly Arrangement68
To Disassemble Bight Control Mechanism69
To Reassemble Bight Control Mechanism70
Bearing Sleeve Sub-Assembly70
Indicator Plate Sub-Assembly70
Bight Lever Sub-Assembly71
Completing Assembly72
To Install Bight Control Mechanism73
To Oil the Machine74
To Grease Gears75
Dangers of Over-Lubrication76
Do Not Lubricate the Motor77
Treatment of Machine Which Have Not Been Used for Months77
To "Run-In" the Machine77
To Adjust the Stop Motion Mechanism for Winding Bobbins78
To Adjust the Bobbin Winder79
To Wind Bobbins Evenly79
To Remove Needle Vibrator Fork Connection82
To Replace Needle Vibrator Fork Connection82
Differences in Bobbin Case Holders and Bobbin Cases of Machine 306 and 319105
When Disc Follower Frame Seems to be Noisy119
"Thumping" Noise120
To Eliminate End Play or Binding of Feed Rock Shaft and Feed Lifting Rock Shaft136
To Eliminate End Play or Binding of Upright Arm Shaft137
To Eliminate End Play or Binding of Horizontal Arm Shaft137
To Set the Index Pins at the Correct Height138
To Time the Cam Stack138
To Set Cam Selector Arm Stops139
To Zero-Out the Machine140
To Centralize the Needle Bar Driving Arm with the Disc Selector Arm Bracket Followers141
To Centralize the Needle in Needle Hole in Straight-Stitching Throat Plate142
To Time the Rotating Hook143
To Set the Position of the Hook Point to or from the Needle144
Removals and Replacements Upright Arm Shaft145
Motor Removal and Replacement145
The Light Fixture Removal and Replacement146
Wiring Harness Removal and Replacement147
Needle Thread Tension Removal and Replacement148
Hand Wheel and Counterbalance Removal and Replacement150
Bobbin Winder Removal and Replacement151
Stitch Regulator Removal and Replacement151
Throat Plate Position Bracket Removal and Replacement152
Feed Lifting Rock Shaft Removal and Replacement153
Feed Rock Shaft Assembly Removal and Replacement153
Hook Driving Shaft Removal and Replacement153
Rotating Hook and Position Finger Removal and Replacement154
Feed Lifting Rock Shaft Connecting Rod Removal and Replacement155
Feed Forked Connection Removal and Replacement155
Needle Bar Removal and Replacement156
Needle Bar Vibrating Bracket Removal and Replacement156
Needle Thread Take-Up157
Cam Stack Removal and Replacement158
Cam Selector Arm Shaft and Followers Removal and Replacement158
Needle Bar Driving Arm Removal and Replacement159
Bight Amplitude and Pattern Selector Removal and Replacement159
Horizontal Arm Shaft Removal and Replacement160
Index169

Singer 306 - Differences in Bobbin Case Holders and Bobbin Cases of Machine 306 and 319

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