JPH0632281Y2 - Electric knife sharpening device switch structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a switch structure of an electric blade sharpening device that rotationally drives a grindstone for polishing a blade.

2. Description of the Related Art The applicant of the present application, in a utility model registration application filed on September 21, 1988, covers the main body case containing an electric motor for rotating the grindstone, covers the grindstone, and has a cutting edge on its side surface. An electric blade that is configured so that the grindstone cover provided with a guide member that guides it to abut at a substantially constant angle is removable, and that it is possible to easily remove the grinding dust adhering to the main body case and the grindstone cover, or to replace the grindstone. Proposed a sharpening device.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above electric blade sharpening device, the power switch is turned on when the grindstone cover is removed from the main body case.
When the N operation is performed, the grindstone rotates, and there is a problem that the operator's finger or the like is damaged. Therefore, the safety of work was poor.

The present invention was devised to solve the above-mentioned conventional drawbacks, and its purpose is to regulate the rotation of the grindstone when the grindstone cover is removed from the main body case, while It is an object of the present invention to provide a switch structure for an electric blade sharpening device that allows the grindstone to rotate when the cover is attached, thereby ensuring worker safety.

Means for Solving the Problems For this reason, according to the present invention, a body case containing an electric motor for rotationally driving a substantially disk-shaped grindstone, and a locking portion for locking a locked portion provided on the body case are provided. And a grindstone cover provided with a guide member for covering the upper outer peripheral surface of the grindstone and supporting and guiding the blade edge of the blade to be polished at a predetermined angle with respect to the side surface of the grindstone. In the blade sharpening device, a switch button movably supported with respect to the main body case with a required stroke, a first electrode plate connected to the power supply side and an electric motor side, and the first electrode plate. With respect to the second electrode plate, which is opposed to the second electrode plate at an interval equal to or larger than the movement stroke of the switch button, and when the grindstone cover is attached to the main body case, the second electrode plate is pressed by the lock portion to be pressed by the first electrode plate. A switch structure of an electric blade sharpening device is configured from a pressing member that elastically deforms one or the second electrode plate toward the other facing electrode plate side so that the distance between them is less than the movement stroke of the switch button. Is characterized by.

Effect of the Invention Since the present invention is configured as described above, when the grindstone cover is removed from the main body case, the first and second electrode plates are
The switch buttons are separated from each other by a distance greater than the stroke of moving the switch button. Therefore, when the switch button is pressed down in this state, contact between the first and second electrode plates is avoided, and power supply to the electric motor is prevented. As a result, the rotation of the grindstone is restricted, and the safety of the operator can be achieved.

On the other hand, when the grindstone cover is attached to the main body case, the pressing member is moved in a desired direction by contact with the locking portion that locks the locked portion. As a result, the position of the first electrode contacting the pressing member is elastically deformed, and the distance with respect to the second electrode plate is set to be equal to or smaller than the movement stroke of the switch button. Then, when the second electrode plate is elastically deformed by the switch button that is pressed in this state, the second electrode plate becomes the first electrode plate.
It contacts the electrode plate and power is supplied to the electric motor. As a result, the grindstone is rotated and the inserted blade is ground.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing an outline of an electric blade sharpening device, FIG. 2 is a schematic perspective view showing a switch structure, FIG. 3 is a transverse sectional view taken along line III-III of FIG. 2, and FIG. FIG. 3 is an exploded perspective view of the cover, in which a main body case 3 of the electric blade sharpening device 1 is formed with first and second engagement step portions 3a and 3b and a bottom surface portion 3c extending horizontally from the bottom surface. A recess 3d is provided at the center of 3c. Further, a through hole 3e communicating with the inside is provided on the side surface of the main body case 3 corresponding to the boundary between the first and second engaging step portions 3a and 3b, and the inner surface of the main body case 3 corresponding to the through hole 3e is provided. Has a locked portion (not shown). Further, locking projections 3f are integrally formed on the front surface and the back surface of the bottom surface portion 3c.

An electric motor 5 is built in the main body case 3, and a rotation shaft of the electric motor 5 passes through a side surface of the second engagement step portion 3b so that an end portion thereof reaches an intermediate portion of the bottom surface portion 3c. It is supported, and a grindstone 7 is replaceably attached to its shaft end. The grindstone 7 is formed in a drum shape in which the central portion of each side surface is slightly bulged.

The main body case 3 has a built-in switch mechanism 9 for rotationally driving the electric motor 5. That is, on the support wall 3g of the main body case 3, a first electrode plate 11a connected to the power source (not shown) side and a second electrode plate 11b connected to the electric motor 5 side are provided with a switch button 13 described later. Are arranged so as to face each other at an interval equal to or greater than the pressing stroke of.
The switch button 13, which is supported on the front surface of the main body case 3 so as to be movable in a predetermined stroke in the front-rear direction, is in contact with one side surface of the second electrode plate 11b. The switch button 13 is made of synthetic resin and the outside is metal-plated. The middle portion of the first electrode plate 11a is formed by cutting and raising a guide piece 11c that is inclined at a required angle. A pressing bar 15 as a pressing member is movably supported on the supporting wall 3g between the first electrode plate 11a and the through hole 3e, and the pressing bar 15 is always moved by the elastic force of the compression spring 17 to the first position. It is biased in the direction A indicated by the solid arrow in FIG. A first sliding contact portion 15a, which is in contact with an intermediate portion of the first electrode plate 11a, is provided at a tip portion of the pressing bar 15, and the first sliding contact portion 15a is provided.
The taper surface 15b which is continuous with the sliding contact portion 15a and coincides with the guide piece 11c and the taper surface 15b is continuous with the first surface.
A second sliding contact portion 15c is integrally formed so as to come into contact with the intermediate portion of the electrode plate 11a and elastically deform in the forward direction.

The whetstone cover 1 is provided on the second engagement step portion 3b and the bottom surface portion 3c.
9 is detachably attached. The grindstone cover 19 has a lower cover 21 engaged with the upper surface of the bottom surface 3c, a lower end with respect to the lower cover 21 and an upper left end with respect to the second engagement step 3b. And a cover 23. And the lower cover 2 with respect to the bottom surface portion 3c
1 is engaged, the engaging protrusion 3f is engaged with the recess 21a.
Are engaged and the attached state is maintained. Locking arms 25 are integrally formed on the left front surface and the back surface of the upper cover 23, and hooks 25a are integrally formed on the locking arms 25 so as to be locked with a locked portion.

An opening 27 is formed in an upper portion of the upper cover 23 so as to substantially coincide with an outer circumference of the grindstone 7, and a pair of left and right support walls 29 is vertically formed in the upper cover 23 corresponding to both sides of the opening 27. , Are formed so as to incline and intersect each other according to a required angle, that is, a polishing angle of the cutting edge. In addition, the mounting cover 3 is attached to the upper cover 23 corresponding to the space between the support walls 29.
1 is integrally formed so as to cover the outer peripheral surface of the upper portion of the grindstone 7. A mounting shaft 33 is inserted into the shaft supporting hole 31a of the cover 31, and a pair of left and right blade pressing members 35 are rotatably supported by the mounting shaft 33. The blade pressing member 35 is constantly urged in the direction of the solid arrow B shown in FIG. 4 by the elastic force of the wire spring 37 attached to the attachment shaft 33.

Next, the operation of the electric blade sharpening device 1 configured as described above will be described with reference to FIG. 2, FIG. 3, FIG. 5 and FIG.

First, the state in which the grindstone cover 19 is removed from the main body case 3 will be described. In FIGS. 2 and 3, the pressing bar 15 is moved by the elastic force of the compression spring 17 in the direction indicated by the solid arrow A in FIG. It has been moved and its right end is located in the through hole 3e. At this time, since the first sliding contact portion 15a of the pressing bar 15 is positioned with respect to the back surface of the one first electrode plate 11a,
The first electrode plate 11a stands up in a substantially vertical state, and the distance between the upper end of the first electrode plate 11a and the upper end of the other second electrode plate 11b is set to be equal to or greater than the pressing stroke of the switch button 13. In this state, that is, when the grindstone cover 19 is removed from the body case 3 and the grindstone 7 is exposed and the switch button 13 is erroneously pressed, the other second electrode plate 11b with which the switch button 13 contacts Is elastically deformed toward the first electrode plate 11a. At this time, the first and second electrode plates 1
Since 1a and 11b are set to have an interval equal to or longer than the pressing stroke of the switch button 13, contact between them is avoided. As a result, the supply of power to the electric motor 5 is restricted, and the grindstone 7 is prevented from rotating.

Next, the operation when the grindstone cover 19 is attached to the main body case 3 will be described. FIG. 5 is a schematic perspective view showing the moving state of the pressing bar 15, and FIG. 6 is a perspective view showing the pressing state of the switch button 13. It is a figure, after attaching the lower cover 21 to the 2nd engagement step part 3b of the main body case 3 so that the recessed part 21a and the locking protrusion part 3f may engage, it is a lower end part with respect to the lower cover 21. When the opening is engaged with the second engaging stepped portion 3b and the lock arm 25 is inserted into the through hole 3e and the upper cover 23 is attached, the hook 25a of the lock arm 25 is covered. Locked in the lock part. At this time, the pressing bar 15 that comes into contact with the insertion of the locking arm 25 into the through hole 3e is moved in the C direction of the solid line arrow shown in FIG. 5 against the elastic force of the compression spring 17. When the second sliding contact portion 15c comes into contact with the first electrode plate 11a along with the movement of the pressing bar 15, the width difference between the first sliding contact portion 15a and the second sliding contact portion 15c is caused. The first electrode plate 11a is elastically deformed toward the second electrode plate 11b. As a result, the upper and lower parts of the first and second electrode plates 11a and 11b are switched button 1
The distance is less than the pressing stroke of 3.

When the switch button 13 is pressed in the above state, the second electrode plate 11b that abuts the switch button 13 elastically deforms toward the first electrode plate 11a and comes into contact with the first electrode plate 11a. As a result, the electric power is supplied to the electric motor 5 so that the electric motor 5 is rotationally driven to rotate the grindstone 7 in a desired direction. At this time, since the grindstone 7 is covered by the grindstone cover 19, contact of the operator's finger or the like is prevented.

When a blade (not shown) to be polished is inserted between the support wall 29 and the blade pressing member 35 in the above state, the blade is pressed by the blade pressing member 35 urged by the elastic force of the wire spring 37. The side surface and the support wall 29 are pressed against each other. As a result, the blade edge of the blade is brought into contact with the side surface of the rotating grindstone 7 at the inclination angle of the support wall 29. When the blade is moved along the support wall 29 in the above state, the blade is brought into contact with the grindstone 7 and polished while the blade pressing member 35 maintains the pressing state against the support wall 29.

As described above, according to the present embodiment, when the grindstone cover 19 is removed from the main body case 3, the pressing bar 15 moved by the elastic force of the compression spring 17 causes the first and second electrode plates 11a and 11b to move from each other. Since the gap is separated by the pressing stroke of the switch button 13 or more, even when the switch button 13 is pressed by mistake, mutual contact is avoided and the grindstone 7
It is possible to prevent the rotation of the. Further, when the grindstone cover 19 is attached to the body case 3, the locking arm 25
As the pressing bar 15 moves against the elastic force of the compression spring 17 and elastically deforms the first electrode plate 11a, the distance between the first and second electrode plates 11s and 11b becomes smaller than that of the switch button 13. Is set to be equal to or less than the pressing stroke of. When the switch button 13 is pressed in the above state,
Due to the elastic deformation of the second electrode plate 11b, the first electrode plate 11a
, The electric power is supplied to the electric motor 5, and the grindstone 7 is rotated. As a result, the rotation of the grindstone 7 can be prevented when the grindstone cover 19 is removed from the main body case 3, and the safety of the operator can be achieved.

Therefore, the present invention regulates the rotation of the grindstone when the grindstone cover is removed from the main body case, while allowing the grindstone to rotate when the grindstone cover is attached, thus ensuring worker safety. It is possible to provide a switch structure of an electric blade sharpening device capable of achieving the above.

[Brief description of drawings]

1 is an exploded perspective view showing an outline of an electric blade sharpening device, FIG. 2 is a schematic perspective view showing a switch structure, FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2, and FIG. FIG. 5 and FIG. 6 are exploded perspective views of the upper cover and are perspective views showing the operation. In the figure, 1 is an electric blade sharpening device, 3 is a main body case, 5 is an electric motor, 7 is a grindstone, 9 is a switch mechanism, 11a is a first electrode plate, 11b is a second electrode plate, 13 is a switch button, and 15 is a press. A pressing bar as a member, 19 a grindstone cover, 25 a locking arm, 29 a support wall forming a part of the guide member,
A pressing member 35 constitutes a part of the guide member.

Claims (1)

[Scope of utility model registration request] 1. A main body case containing an electric motor for rotating and driving a substantially disk-shaped grindstone, and a detachable mount by locking a locking portion to a locked portion provided on the main body case, and a grindstone upper portion. In an electric tool sharpening device equipped with a grindstone cover that covers the outer peripheral surface and supports and guides the blade edge of the blade to be polished so as to form a desired angle with respect to the side surface of the grindstone, And a switch button movably supported by a required stroke, a first electrode plate connected to the power supply side and an electric motor side, and a movement stroke of the switch button with respect to the first electrode plate. The second electrode plates that are arranged to face each other at the above intervals, and the first or second electrode plate when pressed by the lock portion when the grindstone cover is attached to the main body case,
A switch structure for an electric blade sharpening device, comprising: a pressing member that is elastically deformed toward the other opposing electrode plate side so that the distance therebetween is equal to or less than the movement stroke of the switch button.