singer sewing machine 15 91 manual

The Singer 15-91 is a classic vintage sewing machine manufactured from the 1930s to the 1950s. This powerful, all-metal machine features a potted motor, oscillating hook system, straight stitch only capability, built-in light, reverse stitching, and adjustable stitch length. Known for its reliability and smooth operation, the 15-91 is a favorite among vintage sewing enthusiasts. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: All-metal construction, potted motor, oscillating hook, built-in light, reverse lever, stitch length dial, tension assembly.

Installation & Setup

Unpack and inspect contents. Place on stable table or cabinet.

1. Position machine: Ensure stable surface at comfortable height.
2. Connect power: Plug motor cord into power outlet.
3. Install light bulb: Insert appropriate bulb into light housing.
4. Attach foot control: Connect pedal to motor port.
5. Oil machine: Apply sewing machine oil to all points before first use.

WARNING! Machine is heavy; lift with care to avoid injury. Ensure electrical connections are secure.

First-Time Operation

Power on machine; test basic functions.

1. Thread machine: Follow threading diagram for upper and lower threading.
2. Insert needle: Ensure flat side faces back, tighten screw securely.
3. Wind bobbin: Use built-in bobbin winder with thread guide.
4. Test stitch: Use scrap fabric to test stitch quality and tension.
5. Adjust tension: Turn tension dial for balanced stitches.

CAUTION! Keep fingers away from needle during operation. Always unplug when not in use.

Specifications

• Model: Singer 15-91
• Stitch Type: Straight stitch only
• Stitch Length: 0-4mm adjustable
• Bobbin: Class 15 metal
• Needle: 15x1 household
• Presser Foot: Low shank
• Hook System: Oscillating hook
• Motor: Potted motor with foot control
• Weight: Approximately 30 lbs
• Power: 110V AC, 60Hz

Controls and Settings

Main controls: Stitch length dial, reverse lever, tension dial, presser foot lever, hand wheel.

Stitch Length: Turn dial clockwise for longer stitches, counterclockwise for shorter. Reverse: Push lever down and hold for reverse stitching. Tension: Higher numbers for tighter tension, lower for looser. Presser Foot: Lift lever to raise foot, lower to engage fabric.

Additional features: Built-in bobbin winder, light switch, foot control speed adjustment.

Threading the Machine

Upper threading: Follow numbered guides from spool to needle.

1. Place thread spool on spindle.
2. Pull thread through first thread guide.
3. Pass thread through tension discs.
4. Thread take-up lever from right to left.
5. Follow remaining guides to needle.
6. Thread needle from front to back.

Bobbin threading: Wind bobbin using built-in winder, insert into bobbin case with thread pulling counterclockwise.

Basic Sewing Operations

Straight stitch sewing with proper technique.

1. Position fabric under presser foot.
2. Lower presser foot lever.
3. Gently press foot control to start sewing.
4. Guide fabric with both hands, don't push or pull.
5. Use reverse lever to secure stitch ends.
6. Raise presser foot to remove fabric.
7. Cut threads using built-in thread cutter.

Tip: Practice on scrap fabric to master speed control and fabric guidance.

Maintenance & Oiling

Regular oiling ensures smooth operation and longevity.

1. Unplug machine before maintenance.
2. Clean lint and dust from hook area and feed dogs.
3. Apply sewing machine oil to all oil points:
• Hook race and shuttle
• Take-up lever
• Needle bar
• Presser foot bar
• Bobbin winder
4. Run machine without thread to distribute oil.
5. Wipe excess oil with soft cloth.

WARNING! Use only sewing machine oil. Do not use household oils.

Care & Cleaning

Unplug before cleaning. Use soft brush and lint roller for regular cleaning.

Weekly: Remove lint from bobbin area and feed dogs. Monthly: Clean tension discs with folded fabric. As needed: Wipe exterior with soft, dry cloth.

CAUTION! Do not use compressed air or liquids for cleaning. Keep machine covered when not in use.

Regulatory Information

Manufactured by The Singer Manufacturing Company. This vintage machine may not comply with current electrical safety standards. For historical reference only. Always have vintage electrical equipment inspected by qualified technician before use. Singer is a registered trademark of The Singer Company Limited.

Troubleshooting

Service: Consult qualified vintage sewing machine technician for repairs.