How To Solve The Failure Of Round Head Keyhole Lock?

Under normal working condition,

The stitches should be neat, clear, straight lines, and the stitches on both sides should be equally long and straight. The round head should be round and centered around the knife edge.

Usually the operation union meets the so-called "round head not round" fault, that is, the round head part is asymmetrical to the knife edge and the horizontal column stitch, or to the left or to the right side.

In response to this failure, the author provides 4 steps to help you effectively solve the failure of round head locking of round head keyhole machine.

When the circular eye lock machine works normally, the stitches are neat and clear, and the rows are straight lines. The stitches on the left and right sides should be equally long.

The debugging requirements of the factory for the factory are: when the machine is in the cutting state, the space inside the needle should be left with a knife edge, and the cutter trace should be symmetrical between the two inner stitches, and it should be in the middle of the round head.

When the machine is in the first cut state, the inner stitch should be recombined into a straight line, and the cutter trace should be cut right in the inner line trace and evenly around the outside side of the round head.

The so-called "round head not round" locks out by the round head lock machine, which means that the round head part is asymmetrical to the edge of the knife edge and the horizontal column, and to the left or the right side.

The author believes that to solve this problem, we can check and adjust the following steps.

Step one: check the presser foot pressing effect.

Presser feet should be reliable when pressing cloth. If the presser foot can not hold the cloth, the material will deflect when sewing round the buttonhole machine, so it is impossible to ensure the beautiful thread and smooth round head shape.

Step two: check the cutting effect.

When the machine is working normally, the cutting cloth should be neat and neat. Please check regularly whether the edge of the round nose keyhole machine is sharp or not.

In actual use,

Keyhole machine "round head lock is not round" often because the knife block is not grinded, resulting in cloth cutting effect is not good.

Step three: check the clearance of the cam plate.

The structure of the cam part of the round nose keyhole machine: the following is the cam disc seat, which acts as pmission and support; the middle is the lower control cam wheel, its function is to control the mating or straight tail; the top is the upper controlled cam wheel, its function is to control the round head or the flat end.

The positioning of the two convex wheels depends on two pins. One of the locating pins is fastened by the nut under the positioning pin to check whether the nut is reliable and reliable. Then, the left and right rocking clearance of the cam wheel is measured by hand feeling, and the smaller the gap is, the better the machine is running under the condition of smooth running.

Generally, there is no need to adjust the machine without serious wear.

For long-term use and wear, the machine with larger clearance can be adjusted as follows:

Under the cam seat, there is a worm wheel seat cover, which is a worm gear and worm gear meshing, loosens the three fastening screws of the worm wheel seat cover, and adjusts the positioning screws on the cover of the worm wheel seat.

If the screw is screwed, the center distance between the worm wheel and the worm will be reduced, and the meshing gap will be reduced, otherwise the opposite is the case.

Step four: adjust the timing of the upper controlled cam.

When the factors such as presser, cutter and cam disc clearance are eliminated, the reason that the keyhole lock is not round is that the timing position of the upper control cam is wrong.

Adjustment method: if the round head is left to the left side, the adjustment time will be a little earlier.

Rear adjustment, turn the camshaft to a clockwise direction, and adjust it firmly and firmly.