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Singer 375B1 - User Manual

Singer 375B1
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Summary

Sewing Machine Specifications

Names of Machine Parts

Cautions Before Operation

Initial Machine Operation Guidelines

Procedures for low temperatures, first use, and speed limits.

Machine Rotation and Lubrication Checks

Verifying rotational direction and checking lubrication levels.

Lubrication Procedures

Needle Selection and Insertion

Threading the Machine

Thread Path and Procedure

Step-by-step guide for threading the machine from spool to needle.

Thread Tension Adjustment

Tension Disc Settings

Adjusting tension discs No. 1 and No. 2 for button tightness.

Thread Nipper Operation

Needle Bar Adjustment

Needle Bar Timing Lines

Explains the use of timing lines for height adjustment based on needle length.

Setting Needle Bar Height

Procedure to align timing lines at the lowest needle bar position.

Needle and Looper Timing

Aligning looper with needle for correct stitch formation.

Optimal Stitching Condition

Achieving Ideal Stitches

Methods include looper adjustment and loop positioning finger timing.

Loop Positioning Finger Adjustment

Adjusting the lever and cam for proper loop formation.

Timing the Loop Positioning Finger Cam

Aligning cam and sleeve components for correct timing.

Needle Guard Position

Nipper Releasing Plunger Timing

Tension Disc No. 2 Timing

Adjusting the plunger for proper thread release from tension disc No. 2.

Troubleshooting Thread Breakage

Adjustments for common thread breakage issues.

Stitch Selection

Accessing Stitch Selection

Procedure to open cover and use controls for stitch selection.

Selecting Stitch Counts

Steps for selecting 8, 16, and 32 stitches using cam controls.

Button Clamp Height Adjustment

Standard Clamp Height

The 12mm distance between clamp foot and feed plate at stop motion.

Adjusting Clamp Height

Loosening rod set screw to adjust height for correct distance.

Button Clamp Pressure Adjustment

Adjusting Clamp Pressure

Setting spring nut clearance for optimal button holding pressure.

Button Clamp Stop Lever Adjustment

Adjusting for 2-Hole and 4-Hole Buttons

Measuring Button Hole Spacing

Measuring distances between button holes.

Setting Lengthwise and Crosswise Scales

Aligning scales based on measured hole distances.

Verifying Needle Alignment

Checking if the needle correctly enters each button hole.

Malfunctions and Repairing

Thread Trimming Issues

Troubleshooting thread breakage and improper trimming.

Tension and Stitching Problems

Addressing inadequate thread tightening and first stitch issues.

Thread Cutting Errors

Repairing bad thread cutting at stop motion.

Adjusting the Shank Button Attachment

Ensuring Needle Groove Fit

Aligning adapter groove with work support plate groove.

Verifying Needle Drop Accuracy

Checking for equidistant needle drop with the shank button as a pivot.

Setting Cloth Clearance

Creating space to prevent cloth from pushing the button out.

Adjusting Shank Button Holding Clamp

Ensuring the clamp holds the button's center correctly.

Optimizing Holding Pressure

Adjusting spring pressure for secure button holding.

Stable Stitching Conditions

Button Holding Pressure

Adjusting the Metal Shank Attachment

Specifications Summary

Thread Trimming Mechanism

Adjusting the Thread Trimming Mechanism

Adjusting Button Clamp Foot Lift

Moving Knife Position Adjustment

Adjusting Lever and Screw Clearance

Thread Trimming Malfunctions

Adjusting Thread Separating Pawl Height

Summary

Sewing Machine Specifications

Names of Machine Parts

Cautions Before Operation

Initial Machine Operation Guidelines

Procedures for low temperatures, first use, and speed limits.

Machine Rotation and Lubrication Checks

Verifying rotational direction and checking lubrication levels.

Lubrication Procedures

Needle Selection and Insertion

Threading the Machine

Thread Path and Procedure

Step-by-step guide for threading the machine from spool to needle.

Thread Tension Adjustment

Tension Disc Settings

Adjusting tension discs No. 1 and No. 2 for button tightness.

Thread Nipper Operation

Needle Bar Adjustment

Needle Bar Timing Lines

Explains the use of timing lines for height adjustment based on needle length.

Setting Needle Bar Height

Procedure to align timing lines at the lowest needle bar position.

Needle and Looper Timing

Aligning looper with needle for correct stitch formation.

Optimal Stitching Condition

Achieving Ideal Stitches

Methods include looper adjustment and loop positioning finger timing.

Loop Positioning Finger Adjustment

Adjusting the lever and cam for proper loop formation.

Timing the Loop Positioning Finger Cam

Aligning cam and sleeve components for correct timing.

Needle Guard Position

Nipper Releasing Plunger Timing

Tension Disc No. 2 Timing

Adjusting the plunger for proper thread release from tension disc No. 2.

Troubleshooting Thread Breakage

Adjustments for common thread breakage issues.

Stitch Selection

Accessing Stitch Selection

Procedure to open cover and use controls for stitch selection.

Selecting Stitch Counts

Steps for selecting 8, 16, and 32 stitches using cam controls.

Button Clamp Height Adjustment

Standard Clamp Height

The 12mm distance between clamp foot and feed plate at stop motion.

Adjusting Clamp Height

Loosening rod set screw to adjust height for correct distance.

Button Clamp Pressure Adjustment

Adjusting Clamp Pressure

Setting spring nut clearance for optimal button holding pressure.

Button Clamp Stop Lever Adjustment

Adjusting for 2-Hole and 4-Hole Buttons

Measuring Button Hole Spacing

Measuring distances between button holes.

Setting Lengthwise and Crosswise Scales

Aligning scales based on measured hole distances.

Verifying Needle Alignment

Checking if the needle correctly enters each button hole.

Malfunctions and Repairing

Thread Trimming Issues

Troubleshooting thread breakage and improper trimming.

Tension and Stitching Problems

Addressing inadequate thread tightening and first stitch issues.

Thread Cutting Errors

Repairing bad thread cutting at stop motion.

Adjusting the Shank Button Attachment

Ensuring Needle Groove Fit

Aligning adapter groove with work support plate groove.

Verifying Needle Drop Accuracy

Checking for equidistant needle drop with the shank button as a pivot.

Setting Cloth Clearance

Creating space to prevent cloth from pushing the button out.

Adjusting Shank Button Holding Clamp

Ensuring the clamp holds the button's center correctly.

Optimizing Holding Pressure

Adjusting spring pressure for secure button holding.

Stable Stitching Conditions

Button Holding Pressure

Adjusting the Metal Shank Attachment

Specifications Summary

Thread Trimming Mechanism

Adjusting the Thread Trimming Mechanism

Adjusting Button Clamp Foot Lift

Moving Knife Position Adjustment

Adjusting Lever and Screw Clearance

Thread Trimming Malfunctions

Adjusting Thread Separating Pawl Height

Singer 375B1 Specifications

General IconGeneral
TypeMechanical
Buttonhole Styles4-step
Needle TypeUniversal
Stitch WidthUp to 5mm
Stitch LengthUp to 4mm
Sewing Speed750 stitches per minute

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