7. Correct use

7-5. Replacing the bobbin case and threading the thread

CAUTION

Turn off the power switch before removing and replacing the bobbin case, otherwise the machine may operate if the foot switch is depressed by mistake and serious injury could result.

w

r

30mm

 

e

q

Pull the shuttle race cover q toward Insert a new bobbin into the bobbin Pass the thread through the lever

you to open it.case, and then pass the thread through thread hole r, and then pull out ap- the slot w and pull it out from the proximately 30 mm of thread. thread hole e. Check that the bobbin

turns in the direction of the arrow when the thread is pulled at this time.

7-6 . Thread tension reference guide

Thread

#60 or equivalent

 

 

 

Upper thread tension (N)

0.7

- 1.3

 

 

 

Lower thread tension (N)

0.3

- 0.4

 

 

 

Thread take-up spring height

6

- 8

(mm)

 

 

 

 

 

Thread take-up spring tension

0.4 - 0.6

(mm)

 

 

 

Pre-tension (N)

0.1 - 0.3

 

 

Needle

TQ 1#12

 

 

7-6-1 . Lower thread tension

7-6-2 . Upper thread tension

w

Stronger

weaker stronger

Weaker

q

Stronger

Weaker

q

Adjust the thread tension to the weakest possible tension by turning the thread tension nut q until the bobbin case will not drop by its own weight while the thread end com- ing out of the bobbin case is held.

Turn the tension nut q (main tension) to adjust the ten- sion as appropriate for the material being sewn. Furthermore, turn the thread nut w (sub-tension) to ad- just the remaining length of upper thread to 35 - 40 mm when the thread take-up lever is not used.

LK3-B448E MARKII/BA-16

31

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Brother LK3-B448E instruction manual Replacing the bobbin case and threading the thread, Thread tension reference guide

LK3-B448E specifications

The Brother LK3-B448E is a versatile and innovative sewing machine designed to meet the needs of both home sewers and professionals alike. This comprehensive machine is especially advantageous for users who want to experiment with intricate designs and achieve high-quality results with ease.

At the core of the LK3-B448E lies its advanced computerized technology, which facilitates a seamless sewing experience. The machine features a user-friendly interface, making it accessible for not just experienced sewists but also beginners. The LCD display provides clear visibility of settings, stitch patterns, and design options, ensuring that users have full control over their projects.

One of the standout features of the LK3-B448E is its extensive library of built-in stitch patterns. With over 100 different stitches to choose from, including decorative, utility, and quilting stitches, users can easily customize their sewing to suit any project. In addition to the built-in stitches, this machine supports the use of embroidery patterns and designs, expanding creative possibilities significantly.

The LK3-B448E also incorporates advanced sewing technologies, such as automatic needle threading and a drop-in bobbin system. These features simplify the setup process, allowing users to spend more time sewing and less time managing technicalities. Furthermore, the machine offers adjustable stitch length and width, enabling personalized settings that cater to various fabric types and sewing tasks.

Another remarkable characteristic of the LK3-B448E is its adjustable presser foot pressure. This allows for better control, whether working with delicate fabrics or thicker materials. The machine’s speed controls help manage sewing speed, providing additional comfort for users as they tackle intricate patterns or detailed designs.

The LK3-B448E also supports USB connectivity, enabling users to transfer new designs and updates effortlessly. This feature ensures that the machine remains relevant with cutting-edge patterns and functionalities, extending its lifespan and usability.

In conclusion, the Brother LK3-B448E combines user-friendly design with advanced technology, offering a comprehensive sewing experience. Its extensive features, coupled with customizable settings, make it an ideal choice for both novice and experienced users looking to enhance their sewing projects. With the LK3-B448E, creating beautiful garments and intricate designs is a straightforward and enjoyable process.