Instruction Manual for Singer 621C Sewing Machine

The Singer 621C is a classic sewing machine featuring straight and zigzag stitching, built-in buttonholer, reverse stitching capability, adjustable stitch length and width, free arm design, built-in light, and various presser feet for different sewing applications. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Free arm sewing surface, built-in stitch patterns, reverse stitch lever, stitch length and width dials, built-in bobbin winder, presser foot pressure adjustment.

Installation and Setup

Unpack and inspect contents. Place on stable, level surface.

1. Remove all packaging materials and protective covers.
2. Attach foot controller to machine and plug into power outlet.
3. Install needle: Loosen needle clamp screw, insert needle with flat side to back, tighten screw.
4. Wind bobbin: Place empty bobbin on winder, thread through tension disc, engage winder.
5. Insert bobbin: Place wound bobbin in bobbin case following directional arrows.

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

First-Time Operation

Power on machine; practice on scrap fabric first.

1. Thread upper thread: Follow numbered threading path on machine.
2. Pull up bobbin thread: Hold upper thread, turn handwheel toward you.
3. Select stitch: Turn pattern selector to desired stitch.
4. Adjust stitch length and width as needed.
5. Place fabric under presser foot, lower foot, and begin sewing.

CAUTION! Always start with needle in highest position. Never pull fabric while sewing.

Specifications

• Machine Type: Mechanical Free Arm Sewing Machine
• Stitch Patterns: 6 built-in stitches
• Stitch Length: 0-4mm adjustable
• Stitch Width: 0-5mm adjustable
• Buttonhole: One-step automatic
• Bobbin: Class 15 transparent bobbin
• Needle System: 15x1 household needles
• Presser Feet: 3 included (general purpose, zipper, buttonhole)
• Power Requirements: 110-120V AC, 60Hz
• Dimensions: 15.5" x 7" x 12"
• Weight: 12.5 lbs

Controls and Settings

Main controls located on front and side of machine.

Front Panel: Stitch pattern selector, stitch length dial, stitch width dial, reverse stitch lever, presser foot lever, handwheel.

Stitch Selection: Turn pattern dial to select straight, zigzag, blind hem, stretch stitches. Stitch Length: Adjust for fabric type (shorter for delicate, longer for heavy). Stitch Width: Adjust zigzag width for decorative stitching or mending. Reverse: Hold lever for backstitching. Tension: Upper thread tension dial (4-6 for normal fabrics).

Stitch Selection and Applications

Choose appropriate stitch for your sewing project.

1. Straight Stitch: Basic sewing, seams, topstitching (length 2.5mm)
2. Zigzag Stitch: Finishing edges, appliqué, stretch fabrics
3. Blind Hem Stitch: Nearly invisible hemming
4. Multiple Zigzag: Elastic application, mending
5. Stretch Stitches: Knits and stretch fabrics
6. Buttonhole: Automatic one-step buttonholes

Tip: Always test stitch on scrap fabric before sewing your project.

Threading and Bobbin Winding

Proper threading is essential for good stitch quality.

1. Upper Threading: Follow numbered path from spool pin to needle.
2. Bobbin Winding: Place spool on pin, thread through guide, wrap around bobbin, engage winder.
3. Bobbin Insertion: Place in case following arrow direction, pull thread through slot.
4. Thread Take-up: Ensure thread is in take-up lever before sewing.
5. Needle Threading: Thread from front to back, use built-in needle threader if available.

WARNING! Always raise needle to highest position before threading.

Maintenance and Cleaning

Regular maintenance ensures optimal performance.

1. Daily: Brush out lint from bobbin area and feed dogs.
2. Weekly: Oil moving parts with sewing machine oil (2-3 drops).
3. Monthly: Clean tension discs with soft brush.
4. As needed: Replace needle after 8-10 hours of sewing.
5. Storage: Cover machine when not in use to prevent dust accumulation.

CAUTION! Unplug machine before cleaning or maintenance. Use only sewing machine oil.

Accessories Included

Standard accessories with Singer 621C:

• General Purpose Presser Foot
• Zipper Foot
• Buttonhole Foot
• Class 15 Bobbins (4)
• Needles (assorted sizes)
• Seam Ripper/Lint Brush
• Screwdriver
• Spool Pin Felt
• Foot Controller
• Power Cord
• Hard Dust Cover

Regulatory Information

UL Listed: Complies with UL safety standards. FCC Part 15: Class B digital device. Copyright © Singer Manufacturing Company. All trademarks property of Singer. For technical support, visit www.singer.com or contact 1-800-4-SINGER. Made for household use.

Troubleshooting

Service: 1-800-4-SINGER; www.singer.com