Knowledge About Rotary Shuttle

Sewing machines are the most popular sewing machines with stitched stitches.

Most of these sewing machines use rotary shuttles, with their spindle tips linked to the wire ring, and at the same time expand.

It also guides the wire loop around the shuttle center to form a lock stitch.

Working principle of ordinary rotary shuttle

When the needle reaches a certain distance, the spindle point of the revolving shuttle bed begins to hook into the line loop, and then the shuttle point hooks the wire ring to continue to rotate. When the wire ring is sent to the guide rail of the rotary shuttle rack, the wire ring is hooked by the hook of the shuttle rack, and the needle should rise by 2 millimeters from the bottom limit.

The line hook should be moved to the back of the guide when the line is close to the line. The line hook and the needle movement axis angle are 50 degrees or so. The hook line is kept up at 45 degrees above the convex surface of the shuttle frame, and the ends of the loop are hooked on the wire hook. In order to smooth the wire ring smoothly to the surface of the shuttle rack, the thread ends of the wire loop are pushed aside to the outside, while the rear part of the wire loop is hooked to the bottom of the shuttle rack by the hook hook hook on the side, so that the sewing needle is withdrawn from the frame of the shuttle machine. Points on the shuttle rack

Due to the very smooth crossing of the shuttle rack, the line loop slips smoothly from the bottom of the frame. When the shuttle tip is turned over 180 degrees, the take-up rod rises, and the remaining part of the thread that is sent before the take-up rod is lifted. The spindle hook is hooked on the wire ring to continue to rotate. The front half part of the wire loop is underneath the conductor board, and the outer edge of the leading edge is 45 degrees inclined plane, and the edge of the moving conductor plate is gradually lifted out of the lead frame, and the front half line loop is pushed outwards.

The latter half of the line loop is drawn by the hook hook of the shuttle rack, and the line loop is separated from the front and rear parts. The front and rear loops are sleeved through the shuttle frame, and the bottom line is sleeved in the middle, and the thread loop is tightened through the take-up rod to form a stitch.

The principle of forming a stitch is basically the same as that of a swing shuttle, but the process of forming thread traces is similar to that of a swing shuttle.

The method is different from the swing shuttle: it is a hook line that is drawn from the shuttle bed tip to carry out the separation line, so that it can bypass the shuttle core sleeve and the bottom of the shuttle frame, and form the line loop from the surface of the shuttle shuttle head.

According to the lubricating oil way of rotary shuttle, identify its working speed.

Because the spindle speed of the sewing machine is proportional to the spindle speed of the spindle, the maximum speed of the spindle is 7000 revolutions below the middle speed shuttle, and the revolving shuttles which operate at 7000 revolutions or more are high speed rotating shuttles.

In the rotary shuttle, all kinds of reinforced lubrication structures such as oil slit and oil hole are high speed rotary shuttles, which are suitable for high-speed sewing machines with automatic lubrication devices.

The rotary shuttle without the above structure is a dry medium speed shuttle. It can only be used for manual and low-speed sewing machines.

According to the shape of the shuttle plate, identify its sewing performance.

The shape of shuttle plate is determined according to sewing performance requirements.

Slit thin materials are usually made of fine wires, requiring the wire rings to be pulled out from the frame.

Because when the thread ring formed by the needle thread is hooked around the shuttle core, the line is thinner and softer, and the wire ring is unstable.

If it is too early to be released, it will easily be caught again by the shuttle tip which should have been idle.

Therefore, the tail ends of the shutter plate of the slit material are all serpent tail and obviously upwarped, so as to guide the wire ring to gradually escape from the shuttle frame, and let off the shuttle tips, so as to avoid being caught again. The thick and stiff stitches are generally used for sewing thick materials, and the wire rings are easy to maintain shape.

If it is late, it will be easier to tighten the stitches and the surface of the seams will be shallow.

Therefore, the shuttles of the slit thick material have short flat ends and no lifting section of the guide ring.

Medium thick

The shape of the tail of the shuttle plate is between the thickness of the slit and the shape of the shuttle plate.

As long as we master the above points, it is easy to identify the types and uses of rotary spindles through observation.