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General| Brand | Singer |
|---|---|
| Model | 281-21 |
| Category | Sewing Machine |
| Language | English |
Details key operational characteristics and design elements of the sewing machines.
Outlines specific differences in needle stroke, presser bar lift, and stitch length for each model.
Instructions for attaching and adjusting the knee lifter mechanism for presser bar control.
Guidance on adjusting the oil flow regulator to ensure proper lubrication of the sewing hook.
Instructions for cleaning lint and debris from various machine parts using a brush and magnet.
Advises on initial operating speeds for new machines and maximum speeds for models.
Guides on choosing appropriate needles and the procedure for setting the needle correctly.
Step-by-step guide for passing the thread through the upper threading points of the machine.
Instructions for removing the bobbin case, replacing the bobbin, and reinserting the case.
Detailed steps for winding and threading the bobbin with thread.
Procedures for regulating needle and bobbin thread tension for correct stitch formation.
Guidance on adjusting presser foot pressure for proper material feeding.
Instructions on how to change and regulate the length of the stitches produced by the machine.
Method to secure the stitch length regulator to prevent accidental modification.
Procedure for setting the correct distance for the lower needle bar bushing from the throat plate.
Steps to adjust the needle bar to its correct height relative to the throat plate and timing mark.
Procedure for aligning the sewing hook with the needle at the correct point in the stitch cycle.
Adjusting the gap between the needle and the hook point for optimal loop capture.
Detailed steps for moving the hook assembly to set the precise clearance with the needle.
Guidance on adjusting the position finger for correct thread guidance relative to the bobbin case.
Instructions for modifying the needle guard to prevent interference with the hook or bobbin case.
Adjusting the check spring's position and tension for proper thread uptake.
Procedure for adjusting the feed dog height for different fabric types.
Details on feed dog height adjustments, available stop screws, and related settings.
Steps for aligning the feed dog movement within the throat plate slots.
