How To Solve The Pin Thread Scissors Of The Flat Head

In view of the above reasons, the author suggests that it should be resolved in many ways according to practical experience.

Adjust 1, adjust the front and rear scissors movement before and after.

　　 Straight buttonhole machine The front and rear scissors should be 4 mm to 5 mm before and after the scissors. Specific adjustment method: we can unscrew the roller shaft fixing screws at the front end of the lever lifting lever, make it move to the right, increase the scissors' front and rear movement amount, and reduce the scissors' front and rear movement until the left side, until the front and rear scissors' movement volume is within the proper range.

Adjust 2, adjust the position of the scissors around the surface.

When the face line scissors move to the apex of the flat headed keyhole machine, it should be consistent with the needle center, and the front end of the face scissors should fall to the right beyond 5 millimeters.

When the face scissors are closed, we should try our best to ensure that there are 0.3 millimeters to 0.5 millimeters in the two edge of the flat nose keyhole machine. When the surface thread scissors cut the face line, it also clamps the thread left on the machine needle and ensures that the stitches will not be removed from the scissors on the side line when sewing again.

For the adjustment of the left and right position of the face scissors: we can gently step on the left pedal to make the face thread scissors move to the apex of the flat head keyhole machine, then unscrewing the fastening screws of the scissors swing frame, and adjust the position of the front and left sides of the scissors before and after the position of the scissors and the left and right positions through the front and the left, the right and the left, and the right position of the scissors.

For face line scissors Adjusting the closing amount of the cutter and the fixed cutter: unscrewing the fastening screws of the closed shear control board, and moving the closed shear control board before and after moving. When the closed shear control board moves towards the operator direction, the closing time is delayed due to the reduction of the closing quantity.

Adjust 3, adjust the height of the face scissors.

Adjusting the height of the face thread scissors of the flat head keyhole machine should be carried out after lifting the presser foot. It is requested that the fixed knife should not touch the presser foot. When the movement is not allowed to touch the needle pin, it is possible to lower the face line scissors as much as possible.

Specific operation: unscrewing surface line scissors positioning screws and adjusting the upper and lower moving surface scissors.

Adjustment 4, adjustment of the opening time of the face scissors.

The flat head keyhole machine should keep the surface line longer without affecting the horizontal line trace. When sewing begins, it does not allow the thread to be pulled out by the scissors. About 3 stitches to 5 needles, slowly open.

The specific adjustment method is that the screw can be loosened, and the control panel is adjusted before and after moving. When moving to the operator's direction, the scissors of the flat headed keyhole machine are opened ahead of schedule. Note: at this time, do not cause the already closed control panel to be out of position.

Adjustment 5, adjustment of safety cam plate.

Flat ends Buttonhole machine When the connecting rod of the shear shaft assembly is opened and cut, the safety crank of the face thread scissors is contacted with the safety cam plate when the control board is opened. The small plane angle contacted by the safety crank and the safety cam plate is pressed on the inclined plane of the safety cam plate about 0.5 millimeters to 1 millimeters.

Specific methods: unscrewing safety crank fastening screws and adjusting the front and rear safety crank. In the absence of contact, the facial scissors are not open enough to operate. After too much contact, the scissors can not go back after cutting.