We know that there are many sewists who have been a regular sewing machine user yet don’t know how sewing machine works. Although it’s not a big deal at all yet learning it is quite interesting. And we believe that there are numerous ones who are feverish to learn the working mechanism of a sewing machine.
This is why we have been thinking of revealing that fantastic sewing machine mechanism. As per thinking, we spent a lot of hours exploring the issue. We finally came out successfully and today, in this article will be presenting you with the entire fact. Hope, you won’t want to miss such an enjoyable depiction.
How sewing machine works: An microscopic view
The entire mechanism consists of needle mechanism, bobbin and shuttle mechanism, feed-dog mechanism and stitch mechanism. However, before we jump into the main section it is better to introduce you to a short history of sewing machine. This will not only enrich the writing explicitly but also offer you a new source of general knowledge. Let’s begin!
Background of sewing machine
Like every other great invention such as computer, car, airplane and so on, the invention credit of sewing machines can’t be given to any specific or single inventor. Instead, it’s a revolutionary invention, an outcome of the hard-toil of numerous personalities.
In 1589, an Englishman named William Lee, for the first time, sow the seed of sewing machine by inventing the first frame to knit wool stockings. Since that time, the framework of sewing machine has been modified from era to era.
Mechanically, sewing machines function grounded on an ancient mechanism that combines wheels with engineering machineries such as gears, and cams and cranks. Although the idea of gears, cams and cranks is somewhat new yet ancient wheel is an ancient invention.
However, sophisticated sewing machines run by electricity that is an idea of 19th-century. Again, the control of these machines comes from electronics that is a concept of 20th-century.
Hence, it can’t be said that sewing machines are an overnight invention, invented by a single person. Instead, it is a gradual advancement, with electrical, mechanical, and electronic machineries.
Working process of a sewing machine
This one, we consider the easiest mechanism of all the mechanisms. Here, the crankshaft and a wheel are driven by the gray shaft. This forces the needle to rise and fall consistently. Actually, the up and down motion of the needle is created by the round-and-round motion of the motor. Here, the crank basically acts as the convertor of the motor’s rotary motion into reciprocal motion of the needle.
Bobbin and shuttle mechanism
Here, the hook and shuttle, which create stitches from needle thread, rotate slightly quicker than the needle. As a result, the gray shaft cannot but turn the shuttle further speedily that it does with the help of gears.
The feed-dog essentially forwards the fabric or any material via the machine with a stable speed so that stitches can be of the same length. It functions by moving upward at first and then forward consecutively. This takes place via two interconnected mechanisms driven-off the key shaft. One of the mechanisms basically looks like an egg-formed wheel. The wheel forces a lever to toss back and forth. Because of this consecutive tossing, the feed dog is pulled from right to left and after that back at the same position.
In the meantime, another mechanism known as crank mechanism operates the feed dog up and down. When the up and down movements are coordinated, the feed dog functions somewhat like a shoe at the finishing point of an upside-down leg. Generally, a shoe on our leg consecutively moves down and back, and then raises up. The shoe keeps repeating the similar movement, pushing back opposite to the earth so that our body can move forward. On the contrary, a feed dog at first moves upward and then forward.
Mechanism of stitching in short
The three mechanisms discussed earlier are cautiously synchronized so that the machine can create flawless and equal-sized stitches. Here follows the step by step description of stitch formation.
- The needle, at first, stays at the highest position and then moves down towards the fabric or material. Though it is quite unclear what the needle does at this point, it actually feeds a length of the thread via the fabric for forming the following stitch. Here, the needle thread is sufficiently tensioned so that too much thread isn’t pulled off too early.
- The needle pinholes the fabric or leather taking the thread along with it. At this point, the shuttle that is under the fabric keeps rotating. At the same time, the hook keeps oncoming the needle thread,
- The needle then begins to lift up leaving a loop of the thread behind that is the commencement of the following stitch. Immediately, the shuttle hook goes via this loop and hooks on it.
- The needle repeatedly keeps rising though the core action takes place under the fabric. There the shuttle hook pulls the loop right around. Hence it can lock all over the bobbin thread.
- The needle, dragging upward, tightens the thread and drags it back up from the shuttle hook.
- Check the needle still keeps pulling upward, drags the stitch close-fitting. +
- The needle and bobbin threads are accurately sealed together. This is how the machine readies itself for the next stitch.
So, this is how sewing machine works actually. We hope you have enjoyed the entire write up although, there is hardly any necessary info for a professional sewist. However, if you are still curious to learn more of the mechanism, you better enjoy a vivid presentation on YouTube.