Delta 6121 Sewing Machine Manual

The Delta 6121 is a versatile household sewing machine featuring multiple stitch patterns, adjustable stitch length and width, built-in buttonholer, free arm capability, automatic needle threader, top drop-in bobbin system, and variable speed control. Suitable for beginners and experienced sewers alike, this machine handles various fabrics from lightweight silks to heavy denims. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation & Setup 3. First-Time Operation 4. Specifications 5. Controls and Settings 6. Stitch Selection 7. Threading & Bobbin 9. Maintenance & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Sewing machine head, foot pedal, power cord, accessory kit, instruction manual.

Feature	Description
Stitch Patterns	21 built-in stitches including straight, zigzag, decorative
Buttonholer	One-step automatic buttonhole
Free Arm	Removable extension table for cylindrical sewing
Needle Threader	Built-in automatic needle threading system
Bobbin System	Top drop-in bobbin with clear cover
Stitch Length	Adjustable from 0-4mm
Stitch Width	Adjustable from 0-5mm
Speed Control	Variable speed slider and foot pedal control
Presser Feet	Includes zipper foot, buttonhole foot, all-purpose foot
Lighting	Built-in LED work light

Installation & Setup

Unpack and inspect all components. Place on stable, level surface.

Remove machine from packaging: Lift carefully from carrying case.
Attach power cord: Plug into machine and wall outlet (120V).
Install foot pedal: Connect to machine port and place on floor.
Attach extension table: Snap into position for flat sewing surface.
Install needle: Loosen needle clamp screw, insert needle with flat side to back.

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

First-Time Operation

Power on machine; follow threading diagram.

Thread upper thread: Follow numbered guides from spool to needle.
Wind bobbin: Place empty bobbin on winder, thread through tension disc.
Insert bobbin: Drop bobbin into case with thread moving counterclockwise.
Select stitch: Turn pattern dial to desired stitch.
Test sew: Use scrap fabric to check tension and stitch quality.

CAUTION! Always start with needle at highest position. Keep hands clear of moving parts.

Specifications

Stitch Patterns: 21 built-in stitches
Stitch Length: 0-4mm adjustable
Stitch Width: 0-5mm adjustable
Buttonhole: One-step automatic
Bobbin: Top drop-in system
Needle Position: Left, center, right
Max Sewing Speed: 800 stitches per minute
Power Requirements: 120V AC, 60Hz
Machine Weight: 12.5 lbs (5.7 kg)
Warranty: 25-year limited warranty

Controls and Settings

Main controls: Power switch, stitch selection dial, stitch length dial, stitch width dial, reverse button.

Stitch Selection: Turn dial to select from 21 patterns including straight, zigzag, stretch, and decorative stitches.

Stitch Length: Adjust for fabric type (shorter for delicate, longer for heavy fabrics).

Stitch Width: Control zigzag and decorative stitch width.

Reverse: Hold button for reinforcement stitching at beginning/end of seams.

Stitch Selection

Available stitches: Straight, zigzag, blind hem, stretch, decorative patterns.

Straight Stitch: Basic sewing, length 2.0-2.5mm for medium fabrics.
Zigzag Stitch: Finish edges, appliqué, width 3-4mm.
Blind Hem: Nearly invisible hemming, use blind hem foot.
Stretch Stitches: For knit fabrics to prevent popped seams.
Decorative Stitches: Multiple patterns for embellishment.
Buttonhole: One-step automatic, use buttonhole foot.

Tip: Always test stitch on fabric scrap before starting project.

Threading & Bobbin

Upper Threading:

Raise presser foot and needle to highest position.
Place spool on pin, thread through first guide.
Follow numbered path down to tension discs.
Thread through take-up lever from right to left.
Pass through lower guides to needle.
Use automatic needle threader or thread manually.

Bobbin Winding:

Place empty bobbin on winder shaft.
Thread machine as for sewing through tension discs.
Push bobbin winder to engage, press foot pedal.
Stop when bobbin is full, cut thread, push winder back.

Maintenance & Cleaning

Unplug machine before maintenance. Regular cleaning prevents lint buildup.

Remove needle plate: Use screwdriver to access bobbin area.
Clean feed dogs and bobbin case: Use small brush to remove lint.
Oil moving parts: Use sewing machine oil on hook race and other points as manual indicates.
Replace needle: Change after 8-10 hours of sewing or if damaged.

CAUTION! Use only sewing machine oil. Never spray lubricants.

Regulatory Information

UL Listed: Complies with safety standards for household sewing machines. FCC Part 15: Class B digital device. Copyright © Delta Sewing Machines. For technical support, contact 1-800-DELTA-SEW or visit www.deltasewing.com. Made for household use only.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Thread breaking	Incorrect threading/tension	Rethread completely; reduce tension; check for burrs on needle.
Skip stitches	Wrong needle/damaged needle	Replace needle; ensure correct type for fabric.
Bobbin thread bunching	Incorrect bobbin insertion	Remove and reinsert bobbin; ensure thread moves counterclockwise.
Machine not running	Power/pedal issues	Check power cord; ensure pedal plug secure; test outlet.
Uneven stitches	Tension problems	Adjust upper tension; rethread both upper and bobbin threads.
Needle hitting plate	Needle bent/incorrectly installed	Replace needle; ensure flat side to back; tighten clamp screw.

Service: 1-800-DELTA-SEW; www.deltasewing.com