JPH084999Y2 - Sharpener - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a blade sharpener, and in association with sliding of a blade inserted in a slit groove, a grinding wheel is brought into contact with the blade to perform polishing. By doing so, it is possible to prevent the rear edge of the blade and the blade edge from being abnormally cut at the beginning and the end of the sharpening.

(Prior Art) As a sharpening tool, there is known a sharpening tool that slides a cutting tool along a slit groove to grind the cutting edge with a grinding wheel arranged inside the slit groove (Actual Publication 54).
-27668 publication).

(Problems to be solved by the invention) By the way, in the above-mentioned conventional device, when the blade 100 is inserted into the slit groove as shown in FIG. Then, the center portion of the blade 100 comes into contact with the grinding wheel 101 at two points B and C (Fig. (B), but the cutting edge b comes again at 1 point D (Fig. (C)). In this way, when the center of the blade 100 is positioned at the two points B and C and is in contact with the surface, the blade 100 is less likely to wobble and can be ground relatively well, but the edge a at the start or end of the sharpening In the state where the cutting edge b hits the points A and D at one point, there is a problem that the cutting tool 100 wanders and the edge a and the cutting edge b are abnormally cut and rounded as shown by a broken line.

Then, this invention aims at providing the blade sharpener which can eliminate the said problem.

(Means for Solving the Problem) For this purpose, the present invention is designed to insert the blade into the slit groove 3 for inserting a blade formed in the main body case 1 from one end side to the other end side. Grinding wheels 23, 24 for polishing the moving blade 4 are arranged so as to be rotatable and to be able to move forward and backward in the axial direction Q so that they are always in the retracted position apart from the slit groove 3, and one end side is Face the slit groove 3,
Interlocking means 12, 13 for connecting the other end side to the grinding wheels 23, 24 are provided, and the interlocking means 12, 13 are slidable by the cutting tool 4 so that the grinding wheel 2
At the position where the grinding surfaces 23a, 24a provided on the end surfaces of 3, 24a can come into surface contact with the cutting tool 4, the one end side is pressed and moved to advance the grinding wheels 23, 24 to the cutting tool 4 side. It is the one.

(Operation) In the above configuration, the blade 4 is inserted into the slit groove 3,
When it is slid to a predetermined position, the grinding wheels 23 and 24 move forward, the grinding surfaces 23a and 24a thereof come into contact with the blade 4 near the rear portion thereof, and the blade 4 is slid further so that the central portion of the blade 4 is moved. To be polished. Next, when the cutting edge 4b approaches the grinding wheels 23, 24, the grinding wheel 2
3, 24 retreat and their grinding surfaces 23a, 24a separate from the blade 4.

(Example) Next, the Example of this invention is described, referring drawings.

FIG. 1 is a perspective view of a blade sharpener, in which 1 is a long box-shaped body case and 2 is a bottom case. This body case 1
It is bent like a dogleg, and one side of the upper surface is held from above by the left hand, and the blade 4 is inserted into the slit groove 3 for inserting the blade formed on the other side of the upper surface and slides to the front side. By doing so, the cutting edge is polished by a grinding wheel (described later) arranged inside the slit groove 3. Reference numeral 5 is a push-type switch button. FIG. 2 is an exploded view, and FIGS. 3 to 7 are assembly state diagrams. Next, the detailed structure of the blade sharpener will be described with reference to the drawings.

In FIG. 2, reference numeral 10 denotes an inner case disposed inside the main body case 1. The inner case 10 is formed by integrally molding a drive means assembly portion 10a and a battery storage portion 10b. In addition, a notch groove 11 that matches the slit groove 3 is formed on the upper surface of the assembly portion 10a. 44, 45 are medium cases 10
A boss and a screw for connecting to the main body case 1. Next, the parts and members of the driving means assembled in the assembly portion 10a will be described.

12, 13 are levers as interlocking means rotatably attached to the lower surface of the upper wall of the assembly portion 10a by screws 14, 14.
In the assembled state, the tip portion thereof crosses the slit groove 3 (see especially FIG. 3). 48 is a screw hole. 8 and 9 are polishing units, each of which is composed of a cylindrical case 16 in which the motors M1 and M2 are housed, a speed reducer 18, and grindstone parts 21 and 22 rotatably connected to the speed reducer 18. There is.

As shown in FIG. 2 and FIG.
The sun gear 71 mounted on the rotary shaft 19 of M1, M2 and the motor M1,
It is composed of three planetary gears 73 mounted on a pin 72 protruding from the front surface of M2, and an internal gear 74 as an output member attached to the planetary gears 73. Case 16 has motors M1 and M2
Has a front wall 16a as a mounting portion for the motor M1, M2
The output shaft 19 side end portion is attached to the front wall 16a by a pin 75, and the speed reducing portion 18 is disposed on the front wall 16a. In this way, the speed reducer 18 is composed of the planetary gear means,
If it is attached to the front wall 16a, which is the mounting part of M1 and M2,
The deceleration driving means of 23, 24 can be made compact.

Further, since the planetary gear 73 is covered by the inner blade gear 74 as an output body, powder such as polishing powder or abrasive particles does not enter between the gears to cause rotation failure, and further lubricates between the gears. Even if the agent is applied or filled, it does not scatter around and can maintain a smooth transmission state for a long time.

Each of the grindstone parts 21 and 22 includes a grindstone wheel 23 and 24 and a cylindrical grindstone holder 25. The grinding wheels 23, 24 are ring-shaped, one grinding wheel 23 has a small diameter, the other grinding wheel 24 has a large diameter, and the lower part of the small diameter grinding wheel 23 has a large diameter grinding wheel 24 as described later. It can be fitted into the recessed portion 17 in the central portion. A plurality of long grooves 26 are formed in the peripheral wall of the holder 25. Further, ribs 27 are provided so as to project on the peripheral surface of the internal gear 74,
The long groove 26 is detachably and elastically fitted to the rib 27, and the holder 25 is slidably coupled to the speed reducing portion 18 in the front-rear direction.

In this way, the grinding wheel 2
Since the 3, 24 are mounted, the rotational run-out that occurs in the grinding wheels 23, 24 can be suppressed, and the polishing surface can be made smooth. Reference numeral 20 is a coil spring material that is interposed between the speed reducing portion 18 and the holder 25, and biases the grindstone portions 21 and 22 forward.

Reference numeral 31 is a long plate-shaped flange portion projectingly provided on both sides of the case 16, and has a slightly downward slope toward the front (the grindstone portions 21 and 22 side). Engagement portions 34 are erected in a standing wall shape on both sides of the front portion of the case 16. 35 is a polishing unit 8,9
Is a lower case to be assembled, and its cross-sectional shape is U
It is in the shape of a letter and has an opening 37 at the center. The opening 37 is opened for cleaning the grinding dust attached to the grinding wheels 23, 24 and discharging the grinding dust accumulated inside. Further, a long plate-shaped brim portion 38 is projectingly provided on an upper portion of the side wall 36.

After the polishing units 8 and 9 are assembled in the lower case 35, the middle case 10 is covered from above and the screw holes 1
Screws 30 are screwed into 9,39 to be joined, but in that state, two pins 15,15 vertically provided at the rear portions of the levers 12,13 are provided on the inner surface of the engaging portion 34. Engage (see FIGS. 4 and 7). Further, in this state, the flange portion 31 and the flange portion 38 are joined to each other, and the bearing 32 and the coil spring material 33 are interposed therebetween (see FIGS. 5 and 6), whereby the polishing units 8 and 9 are By sliding on the brim portion 38, the grinding wheels 23, 24 can move forward and backward in the axial direction thereof, that is, in the direction Q (see FIG. 4) in which the grinding surfaces 23a, 24a come in contact with and separate from the blade 4. Numerals 28 and 29 are groove portions formed on the upper surface of the collar portion 38 for positioning the bearing 32 and the spring material 33. The spring member 33 biases the motors M1 and M2 and the grindstone portions 21 and 22 mounted on the rotary shaft 19 thereof rearward, that is, in the direction in which the grindstone wheel 23 and the grindstone wheel 24 facing each other move away from each other.

As described above, since the flange portion 31 is projectingly provided on the case 16 with a downward slope, the flange portion 31 is placed on the collar portion 38, and the polishing units 8 and 9 are attached to the lower case 35. In the assembled state, the polishing units 8 and 9 incline upwardly toward the front, and therefore the grinding wheels 2 facing each other in front of each other.
The end faces 23a, 24a, which are the grinding faces of 3, 24, are inclined with respect to the vertical face and intersect in a V shape (see FIG. 4). Therefore, as will be described later, the cutting edge of the cutting tool 4 has the V-shaped end surfaces 23a, 24
Both sides are polished by a.

In FIG. 2, 41 is a lead plate connected to the back surface of the motor M1, M2, 42 is a lead wire, and 43 is a conductive plate. The lead plate 41 is formed by bending a thin plate-shaped spring plate into a key shape, one end thereof is fixed to the bottom surface of the lower case 35, and the other end thereof is a brush electrode plate on the back surface of the motor M1, M2. (Not shown)
It is inserted into and fixed in place (see Fig. 4). As will be described later in detail, the motors M1 and M2 move forward and backward in the direction Q in conjunction with the sliding movement of the blade 4, but the lead plate 41 bends following this sliding movement (chain line in FIG. 4). reference).

Normally, the motors M1 and M2 are energized by soldering the lead wire to the brush electrode plate. However, if the lead wire is repeatedly bent and deformed as the lead wire moves forward and backward, a wire breakage accident at the soldered portion is likely to occur. Therefore, by using the lead plate 41, not only can the connection structure be simplified, but the spring effect of the lead plate 41 can be used to prevent a wire breakage accident due to bending fatigue.

The battery storage portion 10b has a box shape, and the dry battery 4
6 is stored. Reference numerals 56, 57 and 58 are lead plates mounted on the inner wall of the battery storage portion 10b, and 59 is a battery drawing tape. The power supply unit may be a rechargeable battery or an AC power supply.

Reference numeral 50 denotes a cover case which is mounted on the assembling portion 10a so as to cover the notch groove 11 and which is transparent or has a color different from that of the main body case 1 and has a long hole 51 formed on the upper surface thereof. The tip engaging hook-shaped rib 52 projectingly provided on the upper surface of 10a is fitted with one touch and is slidably mounted in a direction orthogonal to the slit groove 3. Reference numeral 53 is a coil spring, and projections 54 and 55 are provided upright on the upper surface of the assembly portion 10a and the cover case 50.
The both ends are fastened to. The spring 53 biases the cover case 50 forward, that is, in the direction of closing the slit groove 3. The cover case 50 always completely closes the slit groove 3 to prevent the blade 4 from being accidentally inserted from directly above the slit groove 3 to hit the levers 12 and 13 and to prevent dusts and dirt from getting inside. Prevents entry inside. One side portion 56 of the cover case 50 has a tapered surface, and the rear end portion 4a of the blade 4 is attached to this tapered surface (see FIG. 1).
When the tool 4 is pressed and the blade 4 is slid forward, the cover case 50 is pushed by the tool and retracts against the spring force of the spring 53. At this time, the front wall surface of the cover case 50 is Since it is pressed against the blade 4, it prevents the grinding dust from scattering from the slit groove 3 to the outside, and also prevents the blade 4 from falling during polishing and presses it against the opposing wall of the slit groove 3 to the front side of the blade 4. Stabilize the drawer slide of.

The bottom case 2 is divided into left and right half cases 2a and 2b. The half case 2a is a battery replacement lid and is detachably attached to the main body case 1. In FIG. 4, 7 is a fitting protrusion, and in FIG. 6, 61, 62, 63 are screws and bosses for assembly. Further, the half case 2b is provided with an opening 40 for discharging the grinding dust accumulated therein, and the lid 6 is detachably attached to the opening 40. in this case,
The half case 2a which also serves as the battery replacement lid is attached and detached by a sliding operation, while the polishing dust discharging lid 6 is operated by a pivoting operation with the L-shaped projection 6a as a pivot. The opening and closing operation is prevented by changing the attaching and detaching operation direction of the lid provided at the bottom of the main body case 1.

In addition, the sliding direction of the half case 2a intersects the sliding direction of the cutting tool 4, so that the half case 2a can be polished by the polishing force during use.
Is prevented from accidentally coming off.

In FIGS. 4 and 5, reference numerals 48 and 49 denote grounding portions provided on both left and right sides of the bottom case 2, and are made of a material having a large elastic coefficient such as rubber or soft resin.

This blade sharpener has the above-mentioned structure, and the handling operation will be described below.

The right hand holds the blade 4, the left hand holds one side of the upper surface of the body case 1 from above, and the thumb pushes the switch button 5 to rotate the grinding wheels 23 and 24. Next, the blade 4 is inserted into the slit groove 3 from the rear end 4a and slid toward the front side. Initially, the motors M1 and M2 and the grindstone portions 21 and 22 connected to the motors M1 and M2 are in the retracted position by the spring force of the spring material 33, and the grinding wheel 23 and the grinding wheel 24 are separated (8th Therefore, the rear end portion 4a of the cutting tool 4 is attached to the grinding wheel 2
Can be inserted between 3,24.

Then, the rear end portion 4a hits the levers 12 and 13 and pushes them, so that the levers 12 and 13 rotate around the screw 14 in the direction to open the legs. Then, the left and right polishing units 8 and 9 are pushed by the pin 15 that projects from the levers 12 and 13 and engages with the engaging portion 34, slides on the flange portion 38 and advances toward the blade 4, and the grinding wheel 23.
The lower part of the wheel is inserted into the recessed part 17 of the grinding wheel 24,
Comes into surface contact with the blade surface near the rear of the blade 4 (Fig. 8 (b)). That is, the levers 12 and 13 serve as interlocking means for moving the grinding wheels 23 and 24 forward and backward in the axial direction Q in association with the sliding movement of the blade 4. The position where the levers 12 and 13 project into the slit groove 3 is preferably located near the center of rotation of the grinding wheels 23 and 24 (see FIG. 3).

In this way, the tool 4 is inserted between the grinding wheels 23 and 24 so that the grinding wheels 23 and 24 can come into contact with the tool 4 at the positions where the grinding wheels 23 and 24 can move forward from the left and right. Since it comes into surface contact with the blade surface, the grinding wheels 23 and 24 hit the lower end edge portion 41a of the rear end portion 4a, and the edge 41a is broken (8th).
It is possible to prevent scraping as shown in FIG.

By further sliding the blade 4 toward the front side, the blade edge is ground, but the lower part of the grinding wheel 23 is the grinding wheel 24 as described above.
Since the grinding surfaces 23a and 24a of the grinding wheels 23 and 24 intersect each other to form a V shape by being fitted in the recessed portion 17 of the grinding wheel 23, the cutting edge is sharply polished on both sides. Further, by setting the V-shaped intersecting position of the grinding surfaces 23a, 24a of both grinding wheels 23, 24 to the maximum diameter position, the polishing mark of the cutting tool 4 becomes orthogonal to the cutting edge line, and the sharpness is high. obtain. Further, since the grinding wheels 23, 24 are in elastic contact with the blade surface via the spring material 28, even if the blade 4 sways to the left or right, the grinding surfaces 23a, 24a of the grinding wheels 23, 24 are firmly pressed against the cutting edge. be able to.

When the blade 4 is slid further to the front side, the blade edge 4b of the blade 4
As the cutting edge 4b is tapered as it goes to, the opened state of the levers 12 and 13 by the blade 4 is released, the levers 12 and 13 rotate in the closed leg direction and return to the initial state, and the polishing is performed. The units 8 and 9 are retracted from the blade surface by the spring force of the spring material 33, the grinding wheels 23 and 24 are separated from the blade surface (see FIG. 7C), and when the blade 4 is slid further to the front side, 4 is removed from the slit groove 3. In this way, the grinding wheel 23,24
Before it contacts the cutting edge 4b, it retreats away from the blade surface, so that the cutting edge 4b is unnecessarily ground and the cutting edge 4b may become round as shown by the broken line (Fig. 8 (c)). Absent.

As described above, the present means interlocks with the sliding movement of the blade 4 so that the grinding wheels 23 and 24 are brought into contact with and separated from the blade 4,
It is possible to prevent the edge 4a and the cutting edge 4b from being abnormally cut at the start and the end of sharpening. Moreover, the rotation of the motors M1 and M2 is
Since it is decelerated by the deceleration unit 18, the grinding wheels 23, 24 rotate slowly at a low speed, and therefore the cutting edge is not abnormally heated by the frictional heat with the grinding surfaces 23a, 24a and is in an annealed state. It does not generate any fricative noise or generate shaft runout.

The present invention is not limited to the above-mentioned embodiment, but various design changes are possible. For example, only one grinding wheel may be provided and one-sided grinding may be performed.

(Effects of the Invention) As described above, the present invention is inserted and slid into the slit groove 3 for inserting a tool formed in the main body case 1 from one end side to the other end side. The grinding wheel 23, 24 for polishing the blade 4 is freely rotatable and always has the slit groove 3
It is arranged so as to be able to move forward and backward in the axial center direction Q so as to be in a retracted position away from, and one end side is made to face the slit groove 3 and the other end side is connected to the grinding wheel 23, 24. Interlocking means 1
2,13, the interlocking means 12,13 is a position where the grinding surfaces 23a, 24a provided on the end surfaces of the grinding wheels 23, 24 by the sliding of the cutting tool 4 can come into contact with the cutting tool 4, Since the one end side is pressed and moves to advance the grinding wheels 23 and 24 to the cutting tool 4 side, the trailing edge 4a and the cutting edge of the cutting tool 4 at the start and the end of sharpening
The 4b is not abnormally cut by hitting the grinding wheels 23 and 24, and the central part of the blade 4 is brought into face contact with the grinding wheels 23 and 24 so that it is firmly positioned so that the grinding can be carried out neatly and evenly. it can.

[Brief description of drawings]

1 shows an embodiment of the present invention. FIG. 1 is a perspective view of a blade sharpener, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a plan view thereof, and FIG. 4 is a side view thereof. 5 is a bottom view of the same, FIG. 6 is a rear view of the same, FIG. 7 is a perspective view of an essential part, FIG. 8 (a),
9 (b) and 9 (c) are a cross-sectional view and a side view during polishing, and FIGS. 9 (a), 9 (b) and 9 (c) are side views during polishing of a conventional one. 1 …… Main body case 3 …… Slit groove for blade insertion 4 …… Blade 12,13 …… Interlocking means 23,24 …… Grinding wheel 23a, 24a …… Grinding surface

Claims (1)

[Scope of utility model registration request] 1. A grinding wheel 23 for polishing a blade 4 which is inserted and slid into the slit groove 3 for inserting a blade formed in the main body case 1 from one end side to the other end side. , 2
4 is rotatably arranged so that it is always in the retracted position away from the slit groove 3 and is movable forward and backward in the axial direction Q thereof.
Further, there are provided interlocking means 12, 13 for connecting one end side to the inside of the slit groove 3 and connecting the other end side with the grinding wheel 23, 24. The interlocking means 12, 13 are made by sliding the cutting tool 4 to the grindstone. At the position where the grinding surfaces 23a, 24a provided on the end surfaces of the wheels 23, 24 can come into surface contact with the blade 4, the one end side is pressed and moved to move the grinding wheel.
A blade sharpener characterized by advancing 23, 24 to the blade 4 side.