JP2557345B2 - Switch mechanism for electric screwdriver - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch mechanism of an electric driver, such as an electric driver, having an operator of an optical switch on the outer surface thereof.

[Background of the Invention]

Conventionally, the operator of this kind of electric driver switch mechanism is fixed to one place on the circumference, and in order to operate the operator easily and accurately, the direction of the electric driver is operated. It should be kept almost constant with respect to the orientation of the worker. However, in the work of the electric screwdriver, the work is often suspended by an elastic component or the like for the purpose of improving workability. In this case, since the direction of the electric screwdriver is not constant, the operator must carefully grasp the electric screwdriver in the direction described above for the above reason. Therefore, the arm and hand should be bent unnaturally or re-grip. However, the operation is troublesome, and the efficiency is low and the fatigue level is high.

[Object of the Invention]

An object of the present invention is to eliminate the above-mentioned drawbacks and significantly improve the operability of this type of electric driver.

[Means for solving problems]

The present invention focuses on the simplicity and versatility of the combination of the optical fiber and the shutter that form the optical switch, and the ring-shaped operator (which is in the form of a washer) is positioned on the ring-shaped operator substantially coaxial with the axis of the electric driver body. A ring-shaped operation is achieved by attaching a shutter and positioning multiple opposing optical fibers evenly and circularly between the outer and inner circles of a ring-shaped (washer-shaped) shutter so as to sandwich the shutter. It is designed so that the same opening / closing function is exhibited no matter which direction the child is operated.

Example of Invention

The present invention will be described below in detail based on the embodiments shown in FIGS. 1 and 2.

In FIG. 1, reference numeral 1 is an outline of an electric driver main body, 2 is a driving motor, 3 is a speed change mechanism, 4 is a toggle mechanism, 5 is a toggle spring, and 6 is a driver bit. There is. 7 is a light emitting diode, 8 is a light emitting diode measuring optical fiber, 9 is a manipulator to which a ring-shaped (washer-shaped) shutter 21 is attached,
10 is a light receiving element measuring optical fiber, 11 is a lower optical fiber,
12 is a light receiving element, 13, 14 and 15 are optical fiber supporting plates for appropriately supporting optical fibers, 16 is a shutter which supports the shutter 21 at a position substantially coaxial with the axis of the electric driver main body and is made of an elastic body or the like. The shutter holder 21 is held at a position concentric with the shaft center of the electric driver main body when an external force does not act on the operator holder 16 due to the elastic restoring force of the operator holder 16. . Reference numeral 17 denotes a toggle shutter located in a gap provided between the lower optical fiber 11 and the light receiving element measuring optical fiber 10,
The toggle shutter 17 moves up and down in conjunction with the operation of the toggle mechanism 4 and is pressed against the elastic force of the toggle spring 5 when the toggle mechanism operates, so that the lower optical fiber 11
The optical path between the light receiving element and the measuring optical fiber 10 can be blocked. Reference numeral 18 is a printed circuit board on which the light emitting diode 7, the light receiving element 12, a control circuit, a connector and the like are mounted, 19 is a connector, and 20 is a power supply device.

Next, the operation of this embodiment will be described. When the power is turned on, the light emitting diode 7 emits light, and the light reaches the ring-shaped shutter 21 portion attached to the operating element 9 via the light emitting diode measuring optical fiber 8, but this light is blocked by the shutter 21. The light is not guided to the lower optical fiber 11 and does not reach the light receiving element 12. In this state as it is, the control circuit is in the off state, current does not flow in the drive motor 2, and the electric driver does not start. When the operator holder 16 is pressed in the axial direction of the electric screwdriver body with a fingertip or the like and any one of the operating elements 9 is displaced in the axial direction, the shutter 18 moves eccentrically with respect to the axial center of the main body.
As a result, the shutter 21 is opened in a part of the plurality of fibers arranged so as to face each other in a circular shape, the light emitted from the light emitting diode measuring optical fiber 8 is guided to the lower optical fiber 11, and the light receiving element measuring optical fiber 10 After reaching the light receiving element 12 via the current, a current flows through the light receiving element 12, the control circuit is turned on, a current flows through the drive motor 2, and the electric driver is started.

When the tightening of the screw progresses and the toggle mechanism 4 operates, the toggle shutter 17 rapidly descends and blocks the light passage between the lower optical fiber 11 and the light receiving element measuring optical fiber 10. Light is not guided to the light receiving element 12, so that the current of the light receiving element 12 stops flowing, the control circuit is turned off, the current of the drive motor 2 is cut off, and the electric driver stops. .

In the electric driver of the type that does not need to interrupt the current of the drive motor 2 in conjunction with the toggle mechanism 4, the toggle shutter 17 is not required, and the lower optical fiber 11 and the light receiving element measuring optical fiber can be integrated. .

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above, according to the present invention, an elastic and ring-shaped operator, which is supported by the outer shell of the electric driver body and is displaceable in the axial direction of the electric driver, is connected and held by the operator and operated. A shutter plate interlocked with the displacement of the child, a gap is formed in the middle of the optical fiber whose one end is close to the light emitting diode and whose other end is close to the light receiving element. According to the present invention, a ring-shaped operator is provided in the outer portion of the electric driver main body so that the switch operation is performed outside the electric driver main body. Since it can be easily operated from any direction from the surroundings, the screw tightening operation by the electric screwdriver becomes easy. In particular, in an apparatus such as an electric screwdriver that is suspended and used, the effect of greatly improving operability can be achieved.

Further, in the invention in which the electric driver has a toggle mechanism for restricting the screw tightening torque, and a toggle shutter capable of interrupting the electric current of the drive motor in conjunction with the toggle mechanism is provided, the toggle shutter ( Since the automatic stop of the electric driver can be realized only by adding the flag), it is possible to achieve the effect of simplifying the structure and reducing the cost while having the automatic stop mechanism.

[Brief description of drawings]

Each of the drawings shows an embodiment of an electric screwdriver switch mechanism according to the present invention. FIG. 1 is a longitudinal sectional view thereof, and FIG. 2 is an AA ′ sectional view thereof. 2 ... Drive motor, 7 ... Light emitting diode 8 ... Light emitting diode measuring optical fiber 9 ... Manipulator, 10 ... Light receiving element measuring optical fiber 11 ... Lower optical fiber, 12 ... Light receiving element 16 ... Manipulator holder, 17 ... Toggle shutter 18 ... Printed circuit board, 19 ... Connector 20 ... Power supply device, 21 ... Shutter

Claims (2)

(57) [Claims] 1. An elastic and ring-shaped manipulator which is supported by the outer contour of an electric driver body and is displaceable in the axial direction of the electric driver, and a displacement of the manipulator which is held by being coupled by the manipulator. A shutter plate that is interlocked with, and one end that is close to the light emitting diode and the other end that is close to the light receiving element. A switch mechanism for an electric driver, which comprises an optical system facing each other. 2. An elastic and ring-shaped manipulator, which is supported by the outer contour of the electric driver body and is displaceable in the axial direction of the electric driver, and a displacement of the manipulator that is connected and held by the manipulator. A shutter plate that is interlocked with, and one end that is close to the light emitting diode and the other end that is close to the light receiving element. The optical system facing each other with a gap different from the gap in the middle of the optical system, and a shutter interlocked with the movement of the toggle mechanism provided in the electric driver is inserted into the gap. A switch mechanism for an electric screwdriver characterized by: