Brother LK3-B448E instruction manual Replacing the bobbin case and threading the thread

Page 38

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

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Contents LK3-B448E Symbols IndicationsLightning may cause problems with correct operation Environmental requirementsSewing IiiLK3-B448E MARKII/BA-16 Contents Changing functions using the DIP switches Name of each part Name of each partSpecifications SpecificationsSpecifications NeedleProgram list Specifications Program No Optional parts Installation InstallationPower table Installing the motor Installing the motor pulleyInstalling the control box Installing the oil pan Installing the cushionsInstalling the machine head Installing the head restInstalling the control box for vibrating bowl Installing the liquid cooling tank, optionalInstalling the vibrating bowl Installing the button feeder Installing the shooterConnecting the cords P11Installation Button feeder connection Control box for vibrating bowl connectionPower switch connector control box Installing the button feeder coverInstallation Power switch connection Installing the operation panel Connecting the ground wireInstalling the V-belt Installing the belt cover Installing the foot switchInstalling the motor cover Installing the spool stand Installing the eye guardAdjustment by the accessory spring Lubrication LubricationLubrication points Applying grease Draining the oilOperation OperationName and function of each operation panel item S E TY-SCALE Setting the X-scale and Y-scale Operating procedureSetting the program number Setting the sewing speedOperating the button feeder Operating the vibrating bowlChecking the sewing pattern When checking by operating only the feed mechanismTo ensure safety during use Checking the sewing patternSelecting the needle and thread Installing the needleCorrect use Threading the upper threadWinding the lower thread Lower thread tension Upper thread tension Replacing the bobbin case and threading the threadThread tension reference guide Adjusting arm thread guide R Thread take-up amountBefore starting sewing SewingSewing Cleaning the control box air inlet port Maintenance and inspectionCleaning the rotary hook Maintenance and inspectionChecking the needle Cleaning the eye guardWipe the eye guard clean with a soft cloth Tileing back the machine head AdjustmentsAdjustments Adjusting the needle bar height Adjusting the needle bar lift amountAdjusting the shuttle race thread guide Adjusting the driver needle guardAdjusting the needle clearance Adjusting the thread take-up amount Adjusting the movable knifeAdjustments Replacing the movable knife and fixed knife Adjusting the button clamp lift amount Adjustment Adjusting the holding pressureAdjusting the position of the button holder Adjusting the button clamp height Adjusting the needle up stop position Adjusting the thread wiperAdjusting the vibrating bowl If buttons are not fed properly, check the followingAdjustment for excess buttons in the button shooter Button replacement Button clamp adjustmentIf button hole arrangements differ Adjustment Adjustment when the button thickness changesAdjusting the button carrier plate Adjustment Adjusting the feeder position adjustment Button hole gap Adjustment Adjusting the needle locationHorizontal feed position Vertical feed positionReplacement the V-belt Sewing machine Belt Checking the input sensor and DIP switch input P1 P2 P3 P4Checking the input voltage Moving stitch patterns Using the production counter Using the countersUsing the bobbin thread counter Using the countersRecording a user program Using user programsUsing user programs P1 P2Using user programs Using a user program Clearing the user programsPress the P1 switch o Using the cycle sewing functionUsing the cycle sewing function Recording a cycle sewing programUsing the cycle sewing function Using a cycle sewing program Clearing a cycle sewing programSetting the presser mode Changing functions using the DIP switchesOperation panel DIP switches Changing functions using the DIP switchesDIP switches inside the control box Memory switches 00 0F Clearing all memory settingsChanging special functions using the memory switches P1 P2 P3 P4Memory switches 20 2F Memory switches 30 4FTable of error codes Table of error codesPanel display Text display Errors generated when optional equipment is connectedSegment LED alphabet LK3-B448E MARKII/BA-16 Troubleshooting Troubleshooting40,46 Needle drops into Hole of the button15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone

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.
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