b. If the needle thread is too loose and the bobbin thread is too tight, then shows as Fig. 20C, And turn the thread tension screw clockwise to increase the needle thread tension; or turn loose the bobbin lace screw to reduce the bobbin thread tension. (See Fig. 21, 22)

For special sewing with special thread, the ten- sion needed can be obtained by adjusting the power and stroke of the thread take-up spring.

5.2 Adjusting the pressure of presser foot (Fig.23)

22

needle thread tension

increase

reduce

The pressure of the presser foot should be adjust- ed according to the thickness of the sewing materials. If stitch on heavy duty material, the pressure should be increased and turn the pressure adjusting screw on the back of the arm clockwise if reduce the pressure, turn it counter-clockwise.

increase

23

reduce

5.3 Use and adjustment of the safety clutch device

The function of the safety clutch device is to prevent the hook and teeth-belt from destroy when the needle thread is drawn into the hook for adnormal load during the operation.

5.3.1The function of the safety clutch device(Fig.24)

a.When the safety clutch device is functioning, the teeth-belt will remove the load and the rock shaft will stop rotating, only the upper shaft rotates, and the machine stops work.

b.Clean off the needle thread which is drawn in the hook.

c.Turn the shaft of the teeth-belt with hand to check if the rock shaft can turn smoothly, then reset the safety clutch device.

5.3.2Resetting the safety clutch device.

a.While press down the button in the bed surface with left hand, turn the balance wheel slowly with right hand in the direction shown in Fig. 25.

pressure adjusting screw

24

safety clutch device teeth - belt pulley

shaft

25

balance wheel

button

-8-

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Reliable MSK-8420B instruction manual Needle thread tension Increase Reduce
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MSK-8420B specifications

The Reliable MSK-8420B is an advanced multi-functional sewing machine designed for professional sewers and manufacturers who demand precision and efficiency in their stitching operations. This machine stands out in the market due to its robust construction, cutting-edge technology, and a wide array of features that cater to a variety of sewing applications.

One of the primary features of the MSK-8420B is its powerful motor which ensures high-speed sewing, capable of reaching speeds of up to 5,000 stitches per minute. This capability allows users to complete projects quickly without compromising on stitch quality. Moreover, the machine is equipped with an automated lubrication system, which reduces maintenance time and prolongs the machine's lifespan.

The MSK-8420B utilizes advanced computer-controlled technology, offering programmable sewing patterns and customization options. Users can save frequently used patterns, allowing for swift transitions between different sewing tasks. The machine's intuitive interface also makes it user-friendly, accommodating both seasoned professionals and new users alike.

Another significant characteristic of the MSK-8420B is its capability to handle various fabrics with ease, from delicate materials like silk to heavy-duty fabrics like denim and leather. This versatility is enhanced by the machine's adjustable presser foot pressure and stitch length settings, which provide control over the sewing process.

The MSK-8420B is designed with safety in mind, featuring an automatic thread cutter that minimizes thread waste and ensures clean finishes. Additionally, it includes an emergency stop button, enhancing user safety during operation.

Connectivity is also a highlight of the MSK-8420B, as it can be integrated with other industrial sewing equipment, facilitating an efficient workflow in high-demand production environments. The machine is also compatible with various sewing accessories, broadening its functionality and appeal to a wider audience.

In summary, the Reliable MSK-8420B combines high-speed performance, advanced technology, and versatility, making it an indispensable tool for sewing professionals. Its features not only enhance productivity but also ensure that users achieve high-quality results across a range of sewing projects. Whether for garment production or specialized textile applications, the MSK-8420B stands as a testament to Reliable's commitment to excellence in the sewing industry.
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