CKPSMS BC-HA1 Bobbin Case Instruction Manual

Introduction

This manual provides detailed instructions for the proper use, installation, and maintenance of your CKPSMS BC-HA1 Bobbin Case. This high-quality metal bobbin case is designed for home sewing machines with an oscillating hook mechanism, ensuring reliable performance for your sewing projects. Please read these instructions carefully before use to ensure correct operation and to prevent damage to your sewing machine or the bobbin case.

Product Overview

The CKPSMS BC-HA1 Bobbin Case is a crucial component for your sewing machine's lower threading system. It securely holds the bobbin and provides tension to the bobbin thread, which is essential for forming balanced stitches. The bobbin case features a hinged latch for easy insertion and removal, and a small screw for fine-tuning thread tension.

Figure 1: Front view of the CKPSMS BC-HA1 Bobbin Case. This image shows the metal construction and the hinged latch used for handling.

Figure 2: Interior view of the CKPSMS BC-HA1 Bobbin Case. This view highlights the internal mechanism where the bobbin is placed and the thread tension is applied.

Compatibility

This bobbin case (Part Number: BC-HA1) is compatible with a wide range of home sewing machines that utilize an oscillating hook and Class 15 bobbins. Please verify your machine's bobbin type before use. Compatible brands and models include, but are not limited to:

• Bernina: Activa 125, 130, 131, 135, 140, 145, 210, 220, 230 & 240; Artista 165, 170 & 730; Aurora 430 & 440; Bernette 715, 730 & 740E; CB Hook Model Virtuosa 150, 153, 155, 160 & 163. Also models 120, 125, 130, 131, 135, 140, 145, 150, 153, 155, 160, 163, 165 & 170; 204-240 series; 317-380 series; 530, 532, 534 & 540; 600, 610 & 642; 700-732 series; 801-832 series; 900-932 series; 1004-1080 series; 1120 & 1130; 1260; 1530.
• Singer: 15-30, 15K30, 15-80, 15-86, 15-87, 15-96, 15-97, 15-110, 15-111, 15-112, 16, 16-188, 16U, 16U288, 17-23, 17U123, 193B, 194, 227.
• White: 167.
• Kenmore: Side load, Straight Stitch models.
• Meister: Oscillator models.
• Necchi: 6011, BU Nova.
• Riccar: Oscillator models.

Important: Use only Class 15 bobbins, not Class 15J bobbins, for optimal performance and to prevent damage.

Setup and Installation

Follow these steps to correctly install and thread the bobbin case in your sewing machine.

1. Preparing the Machine

1. Ensure the sewing machine is turned off and unplugged for safety.
2. Raise the needle to its highest position by turning the handwheel towards you.
3. Remove the extension table from the machine to access the bobbin area.
4. Open the hinged cover to reveal the bobbin shuttle area.

2. Inserting the Bobbin into the Bobbin Case

1. Hold the bobbin case by its hinged latch.
2. Insert a full Class 15 bobbin into the bobbin case. Ensure the thread unwinds in a clockwise direction.
3. Pull the bobbin thread through the small slit on the side of the bobbin case and then under the tension finger.

3. Installing the Bobbin Case into the Machine

1. While holding the bobbin case by the hinged latch, carefully insert it into the shuttle mechanism of your sewing machine.
2. You should feel it click securely into place.
3. Once correctly seated, release the latch.

4. Verifying Installation

To ensure the bobbin case is properly installed and the needle will not strike it:

1. Slowly turn the handwheel towards you.
2. The needle should move up and down without hitting the bobbin case. If the needle hits the bobbin case, or if the bobbin case feels loose, remove it completely and reinsert it, ensuring it clicks into place.

Operating Considerations

Once the bobbin case is correctly installed and threaded, your sewing machine is ready for operation. Always ensure that the upper thread is also correctly threaded through your machine and needle, and that the tension settings are appropriate for your fabric and thread type. An improperly installed or threaded bobbin case can lead to skipped stitches, tangled thread, or damage to your machine.

Maintenance

Regular maintenance of your bobbin case will ensure its longevity and optimal performance:

• Cleaning: Periodically remove the bobbin case and clean any lint or thread buildup from around it and within the shuttle area using a small brush or lint remover.
• Inspection: Inspect the bobbin case for any signs of wear, damage, or burrs that could snag the thread. Replace if necessary.
• Lubrication: Refer to your sewing machine's main instruction manual for specific lubrication requirements for the bobbin area. Some machines require a drop of sewing machine oil in the bobbin race.

Troubleshooting Bobbin Thread Tension

Correct bobbin thread tension is crucial for balanced stitches. If your stitches are uneven or looping, the bobbin tension may need adjustment.

Checking Bobbin Tension

1. Remove the bobbin case with the bobbin and thread installed.
2. Hold the bobbin case by the thread tail, allowing it to hang freely.
3. Snap your wrist once or twice.
4. Correct Tension: If the thread unwinds about an inch or two, the tension is correctly set.
5. Too Tight: If the thread does not unwind at all, the tension is too tight.
6. Too Loose: If the bobbin case drops too much, the tension is too loose.

Adjusting Bobbin Tension

To adjust the bobbin thread tension, locate the small screw on the side of the bobbin case (refer to Figure 1 for location):

• To loosen the tension (if it's too tight), turn the screw slightly to the left (counter-clockwise).
• To tighten the tension (if it's too loose), turn the screw slightly to the right (clockwise).

Make small adjustments and re-test the tension until it is correct. Avoid over-tightening or over-loosening the screw.

Specifications

Warranty and Support

For warranty information or technical support, please refer to the product packaging or contact CKPSMS customer service directly. Ensure you retain your proof of purchase for any warranty claims.