Differential Feed Feed Dog Sewing Machine

And this my friends is the key to understanding differential feed.

Differential feed feed dog sewing machine.

In sewing machine the feed mechanism can be used with both drop feed differential bottom feed. The back feed dog will always make the same rotation. This is great for sewing. Combination of adjustable feed differential bottom feed can make top ply gathering or the gathering of bottom ply.

However unlike a sewing machine the overlocker has two sets of feed dogs. When set at 1 0 the feed dogs are moving at the same speed ratio of 1. The differential feed controls the movement of both the front and the rear feed dogs. Differential feed systems are basically drop feed mechanisms that have two or more feed dogs as opposed to the single feed dog on simpler drop feed only machines.

The differential mechanism includes separate driving mechanisms for each of the two feed dogs mounted on. Sewing machine feed dogs are metal teeth like ridges that emerge from a hole in the throat plate of a sewing machine. These feeds dogs can be manipulated so that the material or fabric around the needle can be stretched or compressed as needed. Differential feed is literally that it changes the speed of the feed dogs so that they feed differently.

Differential feed mechanism sewing machines that use a differential feed mechanism have two independent sets of feed dogs. The differential system allows independent speed adjustment of the feed dogs so they can work slower or faster than the lead feed dog. Keep reading to find out about the settings. The mechanism actually adjusts the two layers of fabric feature and controls the movement of the feed dogs since they can move in different speeds.

When you sew with a puller feed system the fabric is fed through the machine like a drop feed but the additional roller behind the presser foot pulls at the same rate as the feed dog. More accurately the back feed dogs stay constant and the front ones change speed according to how you set the differential feed. The only difference is that with a puller feed system you ll notice supporting rollers that both pull and apply downward pressure to the material to help drag it through the machine. A differential feed mechanism is provided for a high speed industrial sewing machine.

Feed dogs move as you sew gently gripping the bottom fabric to help it pass through the sewing machine and produce a high quality stitch. When you are adjusting the differential feed knob on your machine you are in fact adjusting the rate at which the front feed dog moves.