What is Special Sewing Machines
Sewing machines require cast iron for their frames and a variety of metals for their fittings. Steel, brass, and a number of alloys are needed to make specialized parts that are durable enough for long hours of use in factory conditions. Some manufacturers cast, machine, and tool their own metal parts; but vendors also supply these parts as well as pneumatic, electric, and electronic elements.
Advantages of Special Sewing Machines
Versatility
A bag sewing machine is highly flexible and can be adapted for bags with different sizes and lengths. It has the capacity to meet your vary sewing needs by applying different methods and designs.
Usability
It is quite easy to operate this machine. You only have to enter the bag in it and the rest process of sewing and cutting thread is done by this machine.
Durability
This machine is the result of high quality stable mechanical construction. They are built to work for years.
Productivity
The speed rate of a bag sewing machine has reached upto 2,800 stitches per minute. Even for larger pitches speed can be further accelerated. This helps you in boosting your production with accurate sewing.
Energy saving
With electric system a bag sewing machine is particularly designed to substantially reduce power consumption. The direct-drive system enables ac servomotor to transmit energy with minimum power without making noise.
Why Choose US
Our factory
Deko Corporation is located in the center of the free trade zone at the national level Hi-tech Zone, Xi'an, China. We mainly dedicate in developing, producing and marketing of PACKSTAR brand big bag, bag sewing & bag closing machines since 1990s, we are one of the world leading suppliers of bag closing and sewing machines in the global market.
Rich experience
For more than 30years, we continuously improve the quality from even one small screw to the whole machine lines and our service, in order to meet our valued customers demand both in domestic and overseas market, improve theirs work efficiency and create the value by joint-efforts.
Our product
Our current main PACKSTAR brand industrial bag sewing and closing machines are as below,
FIBC/jumbo/bulk/big bag making machines
Heat sealing machines(for kraft paper,PP/PE and heavy duty plastic bags)
Auto bag closing systems for filled bags
Bag closing machine heads
Portable bag closing machines
Bag infeed and folding machines
Small bag making machines
Carpet overedging machines
Filter bag sewing machines
Net-rope sewing machines (Fishing nets, sport nets,etc)
Geo-textile sewing machine
Artificial turf sewing machines
Ultrasonic non-woven bag making machines
Our service
Through stable quality and professional services, we have distributors and users in more than 30 countries at present. We always trust all business is based on the people, not only for our own company, but also for all partners. We consistently insist on the principles: "Quality, Service, Innovation and Excellence", which will make a prosperous future and all will grow better together!
1. Single needle lock stitch machine
This machine makes lock stitches (stitch class 301). Lock stitches are formed with one needle thread and one bobbin thread. This is a widely used sewing machine and used for sewing stitch class 301. Basic to computer-controlled version is available in this machine category.
Purpose: Single needle lock stitch machines are used for joining two or multiple fabric plies together. The machine is used to sew lightweight, medium weight, and heavy materials.
2. Overlock sewing machine
Overlock machines are available in 3 threads, 4 threads and 5 threads over edge sewing. An overlock machine can form various types of stitches like stitch class 503, stitch class 504 and stitch class 512.
Purpose: This machine is used for serging garment panels (for example: Trouser panels serging) and for overedge stitch. These types of machine are mostly used in knitted garment sewing for overedge stitch. Like side seam stitch of a t-shirt is done using an overlock machine.
3. Flatlock sewing machine
This machine is called a cover-stitch sewing machine. Flatlock sewing machines normally come with 2-3 needles. For the bottom cover stitch machine 2 needle threads pass through the material and inter loop with 1 looper thread with the stitch set on the underside of the seam. Flatlock sewing machine form stitches like stitch class 406.
Flatlock machines are available in two types - a flatbed and cylinder bed.
Usage of these machines: Flatlock machines are used for hemming sleeve and bottom of the knits products. A cover-stitch machine can be used in any part of the garment for decorative purpose.
4. Feed off the arm
This machine is used in making flat and felt seams. Two-needle threads form the chain stitch.
For example, this machine is used for sewing shirt side seams and underarms, and for sewing jeans inseam.
5. Button attaching machine
A special machine used only for stitching button in a garment. Different sizes of button can be attached in same the machine by changing the settings.
Purpose: Attach button. Machine stitches button and trim thread automatically.
6. Button hole machine
This machine is used for making buttonholes on garments. Buttonholes can be made with different stitch densities. Like in shirts, trousers, and polo shirts etc.
7. Bartack machine
Bartack stitch is made to reinforce the seam and garment component. Like in belt loop joining and at the bottom of side pocket opening bartaking is done.
8. Zigzag sewing machine
This machine is used for zigzag stitching. Used in bra manufacturing, jacket manufacturing.
What Are the Application Scenarios of Industrial Sewing Machines
Garment manufacturing: Industrial sewing machines are the most common and widely used in the garment manufacturing industry. They are used to sew various types of clothing, including shirts, pants, skirts, coats, etc. From light to heavy fabrics, industrial sewing machines are able to handle them.
Home decoration: Industrial sewing machines are also used to produce home decoration products such as curtains, bedding, sofa covers, etc. These products usually need to be produced on a large scale, so efficient sewing equipment is required.
Automotive interior: The automotive manufacturing industry uses industrial sewing machines to produce car seats, interior fabrics, airbags, etc. These products require high-strength sewing to ensure safety and durability.
Sports goods: Sports equipment such as sportswear, sports shoes, gloves, etc. Usually require special sewing techniques and equipment. Industrial sewing machines can meet these requirements while being able to handle a variety of different types of sports fabrics.
Industrial bags and bags: Industrial sewing machines are also widely used to produce industrial bags, bags, backpacks and other products. These products usually require special sewing techniques and durability.
Aerospace: The aerospace industry requires high-performance textiles to make aircraft seats, cabin decorations, airbags, etc. Industrial sewing machines also have important applications in this field.
Medical supplies: The medical industry requires a large number of textiles to make medical clothing, surgical cloths, bedding, etc. Industrial sewing machines can provide efficient production capacity and good stitching quality.
Industrial sewing machines have important applications in various industries and can meet the needs of different fields for efficient, stable and durable sewing equi.
The function of the different parts of the sewing machine is given below:
Spool holder
The main function of the spool holder is to control the thread direction and hold the spool. The spool holder may be in the horizontal or vertical direction. Sometimes a sewing machine has more than one spool holder when a decorative stitch is needed.
Bobbin
The bobbin is a small spindle that is wound with thread. Bobbin supplies the bottom thread during the stitch formation.
Bobbin case
The bobbin case holds the bobbin. The hook of the bobbin case catches the previously produced needle loop and moves over the bobbin case. As a result, a stitch is formed by the interlacing of bobbin thread & needle thread.
Thread guide
A thread guide is used to control the direction of the thread. It also helps plenty of supply of thread
Tension regulator
It is used to control tightness or looseness of the upper thread to avoid puckering problems.
Thread take-up lever
The main function of the thread take-up lever is threading the sewing needle and maintaining the proper tension. If the thread take-up lever is incorrect, the thread will knot up, broken & jam in the machine.
Pressure bar lifter
The pressure-bar lifter is used for raising and lowering the pressure foot.
Stitch length regulator
The main function of the stitch length regulator is to maintain the length of the stitch during sewing. Stitch length may vary depending on the fabric type and sewing thread that is used on it.
Balance wheel
The main function is to raise and lower the needle through manual labor. It is used when an extremely thick piece of fabric is required to be sewn. In the domestic sewing machine, it also helps to wind the sewing thread to the bobbin. It is situated on the right side of the machine.
Slide plate
It is a rectangular shape that is situated beside the pressure foot, it helps the removal of the bobbin case without lifting the machine.
Feed dog
It helps to pass the cloth through the machine in a forwarding direction during the sewing.
Needle and needle bar
The main function of the needle is to form the stitch during sewing the cloth. The needle fits in the needle bar which holds the needle with a small screw.
Pressure foot
It is used to put pressure on the fabric during sewing. It helps to prevent wrinkles that could mess up the stitch.
Power switch
The sewing machine is operated sometimes by electricity and manual labor. A power switch is used to supply the electricity to the machine. Normally power switch is on the right side of the machine. The main function of the power switch is to turn on and off the machine. In the modern sewing machine, it gives light to the user to see properly when the machine is turned on.
Foot pedal
It controls the speed of the sewing machine. If you apply more pressure to the pedal you can sew faster.
Back sew button
Back sew is a button that is used to restitch over a very short area to increase seam strength.
Bobbin winder
The bobbin winder is used to wind bobbins with thread. It is located on the top of the sewing machine, near the spool of thread.
If your sewing machine is missing stitches, or the needle seems to be catching on the bobbin case or hook. Follow these instructions to reset the sewing machine needle timing.
But, first replace the needle with a size 90 brand new sewing machine needle. This is extremely important, the needle must be unused, and the correct one!
Remove all the thread and remove the bobbin case and needle plate. You may need to remove the feed dog if required for a better view.
This information will set the needle to the hook timing correctly.
First steps
Set the sewing machine to straight stitch with center needle position.
Turn hand wheel anticlockwise the needle will move up and down. Watch as the needle moves up and down just like the animated image below, see how the needle should go to its lowest point then up slightly, just as the hook point rotates past the needle. That hook should catch the thread from the needle eye.
Prepare the needle position
Keep turning the hand wheel by hand, and stop only when the needle point moves to its lowest point, then moves back up - stop turning when the needle moves exactly 2.2 mm higher than its lowest position.
Set the hook to the needle
Loosen the hook gear or belt pulleys (usually held in place by 2 or 3 allen key screws)
Turn the hook by hand in the same direction as the machine would run (the top shaft and needle must not move), watch the hook movement as the hook point rotates behind needle point - when the hook point is directly behind the needle tighten all gears etc.
The optimum position you must achieve is the needle should be inline with the hook point. Also the needle eye must be just below the hook point.
After timing the needle to hook, the next task that may need to be checked or adjusted would be the feed timing, which is the feed dog moment to needle movement.
Difference Between Chain and Lock Stitch
Sources of main differences between lock stitch and chain stitch are thread requirement, thread bound process, strength, the appearance of the stitch, seam pucker formation, rate of extensibility, stitch security, maximum sewing speed, consumption of thread, etc.
Chain stitch vs lock stitch
In the following table the main differences between chain and lock stitch are given:
|
Sources |
Chain Stitch |
Lock Stitch |
|
|
1 |
Thread requirement |
Two or more thread groups are required to form stitches. Needle thread and looper thread are commonly used in chain stitch. |
At least two thread groups are required to form stitches. Needle thread and bobbin thread are commonly used in chain stitch. |
|
2 |
Thread |
Interloping and interlacing. |
Interlacing |
|
3 |
Strength |
Chain stitch strength is higher than the lock stitch. |
Lock stitch strength is lower than the chain stitch. |
|
4 |
The appearance of the stitch |
At the top of the stitch, it appears like a lock stitch and at the bottom, it looks like a double chain. |
On both sides of the stitch, it appears the same. |
|
5 |
Seam Pucker Formation |
Seam pucker formation possibility is less than the lock stitch. |
Seam pucker formation possibility is higher than the chain stitch. |
|
6 |
Rate of Extensibility |
The rate of extensibility of the chain stitch is 30%. |
The rate of extensibility of lock stitch is less than 30%. |
|
7 |
Stitch security |
Stitches are secured by one cm thread at the end. Back tacking is not required at the finishing end |
Stitches are secured by one cm thread at the end. Back tacking is not required at the finishing end |
|
8 |
Maximum Sewing Speed |
Maximum Sewing Speed of Chain Stitch Sewing Machine is 8000 SPM. |
Maximum Sewing Speed of lock stitch Sewing Machine is 6000 SPM. |
|
9 |
Consumption of thread |
Higher |
Less |
Troubleshooting Portable Sewing Machines
Stitch is too loose.
Check the thread tension.
Check the sharpness of the feed dog and throat plate teeth.
The needles keep breaking.
Check the looper and needle alignment.
Check the needle alignment to the throat plate and presser foot needle guide.
The thread keeps breaking.
Replace needle.
Is the thread unrolling easily from the cone?
Check the thread tension.
Check the thread guides and make sure they are clean.
Check timing procedures listed in item.
The machine is skipping stitches or does not make a thread chain at the end of the bag.
Check the thread tension.
Make sure the thread guides are clean and that thread can easily pass through them.
Is the thread unrolling from the cone easily?
Check the teeth on the feed dog and the throat plate. Replace them if they are dull.
Check if the needle is bent, loose, or misaligned (replace it).
Check if the looper is loose, worn or needs to be reset.
Make sure the machine is properly threaded.