Reciprocating Tool Motor Hold Circuit Without Mechanical Locking
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Solution Overview
Problem
Existing reciprocating tools with mechanical start-up state lock mechanisms are bulky and heavy due to their complex mechanical parts, necessitating a simpler configuration for maintaining electric motor energization after the manual switch is turned off.
Innovation Solution
A reciprocating tool design utilizing a switch device and control circuit to maintain electric motor energization through a simpler electrical mechanism, where the switch device establishes and maintains coupling between contacts based on an electrical signal until the motor's driving operation is stopped.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical start-up state lock mechanism is used to maintain electric motor energization, then the motor can remain energized after the manual switch is turned OFF, but the tool size and weight increase due to many mechanical parts
Solution Approach 1:
The patent replaces the mechanical start-up state lock mechanism with an electrical control system. The control circuit uses a latch circuit formed by OR circuit 22 and AND circuit 23 to detect the ON state of manual switch 14 and maintain the motor energized state through electrical signals, eliminating the need for mechanical locking parts while achieving the same function of maintaining motor energization after the switch is turned OFF.
Solution Approach 2:
The patent extracts and removes the mechanical assembly components from the system. By using the control circuit to detect the switch state and maintain motor energization through electrical means, the mechanical parts responsible for locking the start-up state are completely removed, reducing tool weight and complexity while preserving the functionality.
2Reliability
If a mechanical start-up state lock mechanism is used to maintain electric motor energization, then the motor can remain energized after the manual switch is turned OFF, but the device complexity increases due to many mechanical parts
Solution Approach 1:
The patent substitutes the complex mechanical assembly with a simplified electrical control system. The control circuit uses logic circuits (OR circuit 22 and AND circuit 23) to create an electrical latch that maintains motor energization without requiring mechanical linkages, levers, or locking mechanisms, thereby reducing device complexity.
Solution Approach 2:
The control circuit performs multiple functions: it detects the manual switch state, latches the energized state, and maintains motor operation. This multi-functional electrical system replaces what would otherwise require separate mechanical components for detection, locking, and maintenance, simplifying the overall device structure.
Data Source
AI summary
One aspect of the present disclosure provides a reciprocating tool including a reciprocating member, an electric motor, a transmission device, a drive circuit, a first manual switch, a switch device, and a control circuit. A first contact of the first manual switch is coupled with a power supply, and a second contact of the first manual switch is coupled with the drive circuit. The first manual switch couples the first contact with the second contact in its ON-state. The switch device (i) is turned ON by receiving an electrical signal, and (ii) establishes coupling between the first contact and the second contact in its ON-state. The control circuit continues to output the electrical signal to the switch device until driving of an electric motor is stopped, in response to at least the first manual switch being or having been turned ON.