Safety type switching mechanism used for turn-over saw

Abstract

The present invention relates to a safety-type changer-over switch mechanism for turnover saw. It is characterized by that a single-pole double-throw switch which can be reset to intermediate dead contact can be added and can be used as safety change-over switch, and can be used for making two operation switches of working states be electrically connected into interlocked condition so as to ensure that when the turnover saw is being in one working state of above-mentioned two working states, the operation switch of another working state can be automatically failed, and when the turnover saw in being in intermediate transient state of turnover, two single-pole double-throw switches are being in natural state of dead connection, so that two operation switches of two working states can be simultaneously failed so as to finally ensure service safety of turnover saw.

Description

technical field [0001] The invention relates to a reversing saw which can be switched to a table saw or a miter saw by reversing the working surface, in particular to a safety switch mechanism for the reversing saw. Background technique [0002] The flip saw belongs to a kind of compound saw, which has two working states: table cutting working state (that is, table saw) and miter cutting working state (that is, miter saw). In each working state, different operating switches are set to control the on-off of the motor, and then control the rotation of the saw blade. Generally, the operating switch in the table cutting working state is an electromagnetic switch. The operation switch in the beveling working state is a button switch set on the handle. These two operation switches are connected in parallel in the motor control circuit. These two operation switches are used to control a certain operation switch. switch. There is a defect here. When the reversing saw is in one of ...

AI Technical Summary

Problems solved by technology

The turning saw is equipped with a safety switch that makes its contacts in the corresponding open state as the position of the workbench changes. Therefore, when the workbench is turned over, the motor can be forced to power off through the safety switch without manual control. Due to the stroke The working principle of the switch, this kind of safety switch has a certain error, that is, the travel switch must move a certain distance to force the motor to forcibly cut off the power, so it must be when the workbench is turned over at a certain angle of about 15°, and it cannot guarantee the safety of the table. The power will be cut off as soon as it is turned, so there is still a hidden danger of accidents (normally closed fault), or it will make the turning saw unable to work (normally open fault)

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