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Related Manuals for Bernina 931
Summarization of Contents
Technical Data
Sewing Machine Models
Overview of Bernina sewing machine models 930, 931, 932, and 933.
Technical Specifications
Detailed technical data and dimensions for the sewing machine.
Adjustments for Models 930, 931, 932, 933
Dismantling Covers
Instructions for removing the top and front frame covers for adjustments.
The Needle
Explains the parts and function of the sewing machine needle.
Needle Plate Adjustments
Details needle penetration and adjustments related to the needle plate.
Link and Stitch Position Adjustment
Procedure for adjusting the link and stitch position for various settings.
Needle Rest Position
How to set the needle to its correct resting position.
Lateral Needle Movement
Procedure for checking and adjusting lateral needle movement.
Zig-Zag Stitch Position
Adjusting the stitch position for zig-zag sewing.
Zig-Zag Lateral Needle Motion
Ensuring correct lateral needle movement during zig-zag sewing.
Tracer Lifter Strap Setting
Setting the tracer lifter strap for proper adjustment range.
Notched Carrier Setting
Adjusting the notched carrier for decorative stitch selection.
Notched Segment Setting
Setting the notched segment for stitch selection and scanner coincidence.
Support with Guide Rail and LED
Adjusting the support, guide rail, and LED for stitch selection.
Stitch Distribution with Cam Control
Adjusting stitch distribution using cam control.
Lateral Needle Motion with Cam Control
Adjusting lateral needle motion when using cam control.
Tracer Support for Stitch Types
Adjusting tracer support for straight and zig-zag stitches.
Adjusting Pattern Indicator
Resetting the pattern indicator to match the stitch pattern.
Hook Adjustments
Thread Passage Adjustment
Ensuring correct thread passage through the hook mechanism.
Driver Position in Hook Race
Setting the hook driver position relative to the hook race.
Setting the Return Motion
Adjusting the return motion of the rack for proper timing.
Loop Lift Adjustment
Setting the loop lift to ensure proper loop formation and hook engagement.
Needle Height Adjustment
Adjusting the final needle height after loop lift setting.
Lateral Hook Adjustment
Adjusting the lateral spacing between the needle and hook.
Thread Guide Plate Setting
Setting the thread guide plate for correct needle spacing.
Feed-Dog Adjustments
Feed-Dog Advance
Adjusting the feed-dog eccentric for proper advance.
Setting Stitch Length Knob
Setting the stitch length knob to the correct position.
Stitch Setting Link Zero Position
Setting the zero position for the stitch setting link.
Feed-Dog Position in Needle Plate
Ensuring free movement of the feed-dog in the needle plate.
Feed-Dog Height Adjustment
Setting the feed-dog teeth projection above the needle plate.
Feed-Dog Depth Limit Stop
Setting the depth limit stop for the feed-dog.
Zero Feed Position
Ensuring the feed-dog makes no motion at zero feed.
Stitch Length Control Adjustment
Adjusting stitch length for closed stitch patterns and reverse feed.
Scanner Position with Reverse Feed
Setting the scanner position with reverse feed disconnected.
Cam Set Adjustments
Feed-Dog Control Cam Positioning
Positioning the feed-dog control cam and needle bar control cam.
Fitting and Adjusting Cam Set
Fitting and adjusting the complete cam set.
Basting Device and Automatic Long Stitch
Needle Bar Guide Adjustment
Adjusting the spacing of the needle bar guide.
Needle Bar Cushioner Setting
Adjusting the needle bar cushioner for smooth operation.
Control Lever Adjustment
Setting the spacing for the transmission and control levers.
Control Cam Adjustment
Adjusting the control cam for proper shift lever motion.
Instant of Decoupling (Clutch Lever)
Setting the clutch lever for proper needle bar decoupling.
Thread Catcher Lever Setting
Adjusting the thread catcher lever laterally and checking spacings.
Presser Foot Bar Adjustments
Presser Foot Fixing Height
Adjusting the height of the presser foot clamp.
Presser Foot Adjustment
Adjusting the presser foot for correct sole parallelism.
Setting the Darning Device
Steps for fitting and setting the darning device.
Presser Foot Pressure Regulation
Regulating the presser foot pressure using screw 164.
Needle Stop Device
Setting the Bearing Plate
Adjusting the bearing plate for proper latch engagement.
Setting the Latch Lift
Setting the latch lift for correct armature and latch positions.
Switch Operation
Checking and adjusting the switch operation for the needle stop device.
Needle Positioning
Rough and exact positioning of the needle using springs and screws.
Adapting the Presser Foot Lifter
Adjusting the presser foot lifter to the optimum position.
Thread Tension Adjustments
Upper Thread Tension
Checking and adjusting the upper thread tension.
Lower Thread Tension
Checking and adjusting the lower thread tension using bobbin case.
Thread Regulator Setting
Setting the thread regulator spring and adjusting tension.
Automatic Buttonholer Adjustments
Stitch Length Knob Position
Setting the stitch length knob for the buttonholer.
Setting Stitch Length Stop
Aligning the sliding arrow with the stitch length scale.
Bar Tack Density Setting
Setting the bar tack density to zero material feed.
Reverse Bead (Stitch Density) Setting
Adapting the reverse bead stitch density to the forward bead.
Forward and Reverse Bead Length
Measuring and correcting the length difference between forward and reverse beads.
Bar Tack and Bead Width Check
Checking and correcting cut gap and bead width.
Bobbin Winding Device Adjustments
Pre-tensioner Adjustment
Setting the pre-tensioner flush with the tightening bolt.
One-Sided Winding Correction
Adjusting the eccentric bolt for one-sided winding.
Bobbin Filling Correction
Adjusting the setting disc for bobbin filling.
Drive System Adjustments
Toothed Belt Re-tensioning
Re-tensioning the toothed belts for power transmission.
Electrical and Electronic Equipment
D.C. Motor Features
Features of the DC motor, including power consumption and speed regulation.
Electronic System Functions
Functions of the electronic system, speed control, and penetrating power.
Needle Stop Device Operation
Operation of the needle stop device independently of machine speed.
Electronic System Construction
Overview of the electronic system's printed circuit boards.
Exchanging Printed Circuit Boards
Procedure for exchanging printed circuit boards (PCBs).
PCB S 930 Exchange
Procedure for exchanging PCB S 930.
PCB T 930 Exchange
Procedure for exchanging PCB T 930.
PCB D 930 Exchange
Procedure for exchanging PCB D 930.
PCB U 930 Exchange
Procedure for exchanging PCB U 930.
Motor Adjustments and Maintenance
Motor Dismantling
Steps for dismantling the motor from the machine.
Changing Motor Brushes
Procedure for replacing worn motor brushes.
Electrical Adjustments to PCBs
PCB Potentiometer Adjustment
Adjusting potentiometers on PCBs for speed control.
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