How To Adjust The Opening Of The Keyhole Machine

Buttonhole machine

It may not be able to wrap the thread of the scissors, causing the thread to be exposed outside the keyhole, which will affect the appearance of the finished product.

This is usually caused by incorrect position of the scissors or too narrow width of the seam.

First of all, to determine the total width of the keyhole is 4~5 millimeters, that is, the width of the left horizontal column should be more than 2 millimeters. The total width of the keyhole will be less than 3 mm.

Next, determine the position of the scissors. When the foot pedal is lifted to the foot pedal, the scissors move forward to the level of the machine needle before the foot is lifted. The position of the needle tip is about 5 millimeters. When the scissors return, the tool tip is at 1 millimeters across the cutting edge or even before the position. This position is approximately the location. It needs to consider comprehensively the size of the opening and closing shear control plate's position and the amount of expansion motion.

When the seam is cut, the scissors are adjusted to 3~4 needles, then the scissors move back to the left, then slowly open the scissors to make the thread smoothly sewn in.

If the thread of the scissors clip is too long, it will cause.

Half wrapped in the middle of the left row.

Properly adjust the position of the scissors opening and closing electric shear adjusting plate, make the scissors back to the left at the beginning of the 3~4 stitches, then adjust the position of the scissors control board, so that the scissors slowly extend when the scissors return.

If the scissors do not open in time, it will lead to scissors damage if the cutting time is too late.

After adjustment above, we should carefully observe the thread of the initial seam. If not ideal, we should adjust the left and right position of the scissors, even if the scissors are clamped to the left and right sides of the needle.

The position of scissors is adjusted theoretically by increasing or decreasing the shim on the opening and closing device. In actual operation, the position of the knife rest can be adjusted by fine tuning.

After adjusting the tool holder, check the position of the opening and closing shear control board carefully.

Scissors adjustment is a meticulous work.

When adjusting, we should consider all kinds of circumstances. If the adjustment is improper, serious problems such as broken needles and broken knives will occur.