Control mechanism of overedger presser foot on-off safety switch and control method thereof

Abstract

The invention discloses a control mechanism of an overedger presser foot on-off safety switch and a control method thereof. The control mechanism comprises radial magnetic steel, a presser foot arm, a driving lever, and a Hall assembly. The driving lever is arranged on the presser foot arm and can be pulled up and down relative to the presser foot arm. The lower end face of the driving lever is provided with a U-shaped groove in which the presser foot arm can be clamped partially. The inner side wall of the U-shaped groove is provided with a round hole used to install the radial magnetic steel. The position of the presser foot arm, relative to the driving lever, is provided with an installing hole used to install the Hall assembly. The Hall assembly comprises a Hall PCB and a Hall element which is arranged in the installing hole in a direction vertical to the length direction of the presser foot arm and is vertically inserted in the Hall PCB. When the presser foot arm is closed, the presser foot arm is partially clamped in the U-shaped groove of the driving lever, and an overedger control system controls a motor to normally operate. When the overedger needs to open the presser foot arm, the driving lever moves upward to leave the presser foot arm, and the overedger control system stops the motor to start before the presser foot arm is closed.

Description

technical field [0001] The invention relates to a control mechanism for opening and closing a safety switch of a presser foot of an overlock sewing machine and a control method for a safety mechanism of an overlock sewing machine applied to the control mechanism. Background technique [0002] Sewing machines and other equipment often need to perform operations such as changing machine needles or changing presser feet during use. When the operator is doing this type of operation, if he accidentally touches the start switch of the equipment, the motor will be accidentally started and run at a high speed. cause injury to personnel. Therefore, it is very dangerous for the motor to start up by mistake during operations such as changing the machine needle or changing the presser foot. In order to avoid the accidental start of the motor, a protection device must be installed on the sewing machine to prevent the motor from starting by mistake. When the protection device detects th...

AI Technical Summary

Problems solved by technology

In this case, the machine is still not protected, which may also cause damage to the machine or injure people.

This method of determining the distance due to the strength of the axial magnet leads to particularly high requirements for the consistency of the magnet strength, which is not suitable for mass production

Moreover, the procurement of magnets is also extremely difficult. If you purchase magnets casually, you will be prone to either frequent alarms, or the problem of not being able to alarm when you move a certain distance away, and cannot effectively play a protective role.

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