Mattress sewing machinee classification and function 2
Classification of sewing machines according to the type of bedThe bed of the sewing machine is the portion of the sewing machine on which the fabric is placed. The classification of the sewing machine body type or shape type is based on the falling, behavior and travel of the fabric relative to the bed during the sewing process, so that the material is easier to move around the machine.
Blank sewing machine
The three sewing machine parts that make up the lower feed mechanism are the presser foot, the needle plate and the feed dog. In the drip feed system, the feed dog feeds the fabric from the bottom while the needle is up. Since only the bottom ply is in contact with the teeth of the feed teeth, and the top ply is expected to slide under the presser foot, and the frictional force is negligible. Therefore, there is no positive bonding force between the two plies.
When sewing fabrics of two or more thicknesses, regardless of whether they are separate fabrics or folded portions of the same fabric, there is a problem that the friction between the bottom layer and the feed stop is greater than the friction between the middle layer. The tendency of the lower layer to move forward satisfactorily on the feed teeth and the delay of the upper layer by the presser foot is called interlayer displacement, differential feeding creases or only feeding creases.
Needle feed sewing machine
Compound feeding is the simultaneous feeding action of needle feeding and falling swing feeding, which can be used for sewing with low friction coefficient between layers. In a composite feeding system, the needle and the feed stop feed the fabric together when the needle is down and inside the fabric. When the needle is inside the fabric, the feeding dog starts to transport the fabric from the bottom, so the slip between layers can be controlled. Since the moving arc length of the needle is very small, and the thickness of the sewn fabric layer is also negligible, the resulting interlayer slip is hardly seen in the sewn material.
The composite feed is used to eliminate interlayer slip in multi-layer stitching of thick materials, negotiate with the corners of acute-angle parts, and perform top stitching on the edges. Usually, double needle lockstitch sewing machines have a needle feed system.
X feed sewing machine
The X feed from Typical Corporation is characterized by needle feed and alternating droplet feed. Dog feeding is divided into two independent dog feeding. The center one has a pinhole, like a needle feed, and the side one like a drop feed. In the first half of the stitch length, the needle enters the material, passes through the hole of the central feed dog, and transports the fabric like a compound feed mechanism. The side feed teeth are below the height of the needle plate.
X feed claims that the thread tension during sewing is reduced by 35%, which results in a smoother seam appearance without wrinkles, and the incidence of ply slippage during X feed is also significantly lower than drip feed.
Cycle sewing machine
The cycle sewing machine finishes the sewing work in a short automatic cycle, so it is called cycle or automatic cycle. In these machines, the needles only move up and down to form stitches, and pinch feed moves the fabric horizontally or vertically to form the desired shape. The movement of the fixture is controlled by the cam follower mechanism or electronic equipment.
Button sewing machine
These are single-chain stitch (type 107) or flat stitch (type 304) heads in which the fabric is placed above the cloth clip and the button is placed in the button clip. Once the operator starts the machine, the button clamp will descend and hit the cloth clamp. The button and fabric clip move horizontally and vertically with the movement of the cam follower wheel or microprocessor. At the end of the cycle, the thread is cut and the empty button clip moves to the original position to sew the next button.
The buttonhole sewing machine has a flat stitch zigzag (304 type) or double chain stitch zigzag (404) head, in which the fabric is placed on a cloth clip. Once the operator starts the machine, the fabric holding frame will lower, clamp the fabric tightly on the clamp, and then the clamp will start to move. The buttonhole is formed by a series of zigzag stitches, which have different degrees of needle drop in synchronization with the movement of the feed shaft clamp.
The button holes are formed by cutting/cutting the fabric after sewing or before sewing. In the ordinary straight buttonhole, once the sewing cycle is completed, the knife will be lowered to cut the center of the buttonhole, called the cutting mechanism. The appearance can be improved by sewing around the recommended cutting area at the beginning of the sewing cycle. The fixed stitches can enhance the effect and make the area around the incision hard.