Mechanical Electronic Computerized Sewing Machines
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Mechanical Sewing Machine:
A mechanical sewing machine has no circuitry in it. The stitch patterns are formed by cams and followers. These cams or discs may be built in, insertable, or both. They have bumps on them, and as they turn, the followers are moved by the bumps and in turn move the needle to its proper position in the stitch as you sew.
The motor is AC (alternating current; see sewing machine motors). This is the same as your household current. The machine may have a rheostat or electronic foot control (see foot controls).
These are the vintage sewing machines or today’s lower-end offerings.
Mechanical sewing machines have no automatic needle stop, and they stop randomly in their cycle when you take your foot off the controller. When you stop, be sure to turn the handwheel toward you until the needle has barely started on its downward path. This will help prevent thread nests upon starting.


Electronic Sewing Machines:
This type of machine forms stitches using cams and followers, just like a mechanical version. It uses a minimal amount of circuitry to control the power to the motor and often comes with an electronic foot control. The motor may be AC or DC (direct current; see Sewing machine motors). There may be needle-up and -down features and LED indicators for stitch settings.


Computerized Sewing Machines:
A computerized sewing machine has no cams for creating stitches; instead, the needle and feed dog positions for each stitch are stored in a chip. The information for each position is sent to stepping motors that control the needle bar and the feed dogs. A stepping motor is a small motor run on magnetic impulse-there is one for stitch length and one for stitch width. As you change the length and width of your stitch, you change the voltage to the motors and the position of the needle bar or the feed dogs to their correct positions. Because each stitch is just a matter of programming, and not cramming another disc or cam into the machine, there can be a larger variety of stitches.


Computerized sewing machines can be put into a number of categories. There are push-button machines and touchscreen machines. Some are sewing machines and some are sewing and embroidery machines. There are also stand-alone embroidery machines. One of the great features of this type of machine is that the stitches are programmed in with an optimal default stitch length and width. This can make it easier for the sewist to operate the machine.
Computerized sewing machines also have memories, where stitches that have been altered or grouped can be stored and retrieved as needed. As a rule, these machines have DC motors, which provide better control at slow speeds (see DC Motors). Many of today’s computerized sewing machines have sensors that stop the machine if the top thread breaks. This is very helpful if your machine is embroidering and the thread breaks when you are not in the room. Another great feature is the low-bobbin warning found on these machines.

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