KR200283905Y1 - Electric knife grinder - Google Patents

Abstract

The present invention is to provide an electric knife grinder that improves the polishing efficiency and the replacement convenience of the polishing member, to rotate the rotary drum surrounded by sand paper with a motor to polish the knife or scissors on the blade base, A main shaft 3 having a locking groove 3a that is locked to the catch 35 of the rotating drum lock; The contact surface for the cam 25 which is slightly smaller than the circumference and is supported by the pin 20 on the inner plate 4a and is capable of shaft diameter and circular recovery according to the cam operation of the circular inner plate 4a and the outer plate ( A rotating drum 4 in combination with a pair of drum members 4b having 24) and an outer plate 4c having a shaft 25 and a circular recovery operation cam 25 of the drum members 4b; An endless polishing ring (29) having a cushion ring (30) inserted therein and mounted to the rotary drum (4); The lever 35 and the lever provided on the clamping shaft 36 on the support plate 2 so as to be interlocked with the drive clutch 32 and the lever 34 integral driven clutch 33 installed on the camshaft 8 and the lever 34. An electric knife grinder comprising a rotating drum locking device comprising a lever spring 37 for stabilizing position 34 and a blade restraining surface 9e of the multi-face cam 9.

Description

Electric knife grinder

The present invention relates to an electric knife grinder which implements the improvement of the polishing efficiency and the replacement of the polishing member.

As an electric knife grinder, there is a Utility Model Registration No. 240841. The rotary drum for rotating the sand paper in the knife grinder has a concave groove formed at half the outer circumferential surface thereof, and two strip-shaped sand papers slightly longer than the semi-circumferential length of the rotating drum have respective connecting ends overlapping each other in the concave groove. It is so tightly enclosed in a rotating drum that it is then fastened to the concave groove by overlapping the end of the sandpaper with a bolt. Of course, the bolt head does not protrude out of the recess so that the blade head does not touch the blade when sharpening.

These rotating drums and two-piece strips of sandpaper are not only inconvenient when loading sandpaper at first, but also when replacing old paper with new ones, and loosening and tightening the bolts is not uncomfortable. In addition, whenever the concave groove of the rotating drum passes under the knife, the knife rocked, reducing the blade grinding efficiency and impact damage caused by vibration on the hand holding the hilt.

The object of the present invention is to provide an electric knife grinder which can increase the polishing efficiency of the blade and is easy to load and separate the sand paper for the rotating drum.

According to the electric knife grinder of the present invention for achieving this problem, the pair of drum members, one end of which is axially circumferentially mounted on the inner plate, can be easily reduced in diameter by the cam of the outer plate.

In addition, it is easy and safe to remove and remove sandless endless polishing rings by including locking means to prevent rotation when the rotating drum is reduced in diameter or diameter and returned to a circular shape.

1 is a perspective view of an electric knife grinder with a cut tray loaded

2 is a perspective view of the scissors

3 is an exploded view of the rotating drum and the polishing ring and the main shaft

4 is a front view of the outer plate;

5 is a cross-sectional view when the rotating drum is in a circular state

Figure 6 is a cross-sectional view of the rotating drum shaft reduced state

Figure 7 is an exploded view of the rotating drum lock

8 is a state in which the rotating drum is free

9 is a state in which the rotating drum is locked

<Description of the symbols for the main parts of the drawings>

2: support plate 3: spindle

3a, 35b: Locking groove 4: Rotating drum

4a: inner plate 4b: drum member

4c: outer plate 5: motor

7a, b: Base rod 8: Camshaft

9: face cam 9e: lock face

10: blade holder 14: blade holder

15: Scissors 19c: Control Panel

20: pin 24a: protruding surface

25: cam 29: polishing ring

30: cushioning 32: drive clutch

33: driven clutch 34: lever

35: clamp 37: lever spring

In Fig. 1, the electric knife grinder is provided with a rotating drum 4 on a main shaft 3 provided between a pair of parallel support plates 2 placed on a base plate 1, and the main shaft 3 is formed of a support plate 2. It is rotated by the motor 5 provided in the rear.

Rotating drum (4) in front of the support plate (2), the three horizontal support rods (6) installed side by side with the front and rear with a constant height difference up and down to support the cut support or scissors.

At the back of the rotary drum 4, the support plate 2 is provided with support rods 7a and b at a predetermined distance from the rear and back of the rotating drum 4, and is slightly lowered between the support rods 7a and b. The camshaft 8 is provided. The camshaft 8 is provided with the multi-sided cam 9 which adjusts the front-back distance of the blade base 10. As shown in FIG.

In the state mounted on the support rods 7a and b, the front and rear strong tension springs 11a and b are always pulled down to maintain the posture to return to the support rods 7a and b. The tip 13 of the cam hole 12 drilled in the blade support 10 is in contact with the cam surfaces 9a to d of the multi-faced cam 9, and the blade support 10 is operated back and forth to gradually increase the depth of the polishing surface of the knife. To adjust.

When cutting the knife as shown in Figure 2 loaded with a knife support 14 for guiding the knife back to the support rod (6), and when setting the blade of the scissors is replaced with the scissors support (15) of Figure 2 to the support rod (6).

In this electric knife grinder, the rotary drum 4 is constituted by a circular inner plate 4a, a pair of drum members 4b and an outer plate 4c as shown in FIG. In the center of the inner surface of the inner plate 4a, a boss 16 is fitted into the boss hole 26 of the cam 25 serving as the boss of the outer plate 4c in a state of being fitted to the main shaft 3. At the periphery of the boss 16, a rounded jaw 17 is formed in which the inner edge of each drum member 4b is hung in the center direction.

Of the four quarters of the circumference of the round jaw (17), the dorsal point (18) is formed at the outer two points in the flat direction, and the pin groove (19) is formed in the middle between the dowels (18). On the outside, the control plate 19c for controlling the outward opening according to the centrifugal force during the rotation of the drum member 4b is in contact with the protruding surface 24a of the drum member 4b so that the circumferential height of the outer plate 4c, i.e. Keep the grinding height constant at all times.

The stopper 18 is provided with the role of a stopper which axially installs each fixed end of the drum member 4b, and prevents reverse turning beyond the reference in the centrifugal direction after recovering the circular shape.

The pin groove 19 is a drum member 4b in which the cam 25 pivots in the axial direction while the inclined pin 27 formed at the tip of the cam 25 crawls when the outer plate 4c is turned clockwise in the figure. Open the outer plate 4c and turn the outer plate 4c counterclockwise in the figure so that the outer plate 4c withdraws from the inner plate 4a while the inclined pin 27 is out of the pin groove 19. It guides the drum member 4b to be reduced in diameter.

The drum member 4b is formed to be a little smaller than a circular arc half-circumferentially, so that the drum member 4b can be rotated from one side to one side of the pin to be reduced in diameter and returned to a circular shape. A pin 20 is inserted into the dowel 18 to selectively install the shaft. In addition, a jaw groove 21 larger than the radius of the round jaw 17 is formed at the inner edge to allow the drum members 4b to turn in the center direction as much as the radius difference from the round bar 17. .

In addition, at the inner end of each drum member 4b located at the side where the tip of the pin 20 is exposed, the drum member 4b can be pivoted in place without being stuck to the magnetic side handle 18, and at the same time circular After regaining the dowel groove 22 is formed to prevent the further turning back in the centrifugal direction. The inner surface of each drum member 4b is also provided with a contact surface 24 which is driven by the cam 25 so as to recover the circle or reduce its diameter.

The cam 25 for restoring the state in which the drum member 4b is reduced or reduced is protruded so as to face the inner plate 4a from the center of the inner surface of the outer plate 4c. When the outer plate 4c is turned clockwise in the state where the rotating drum 4 is assembled, the front face 25a of the cam 25 touches the contact surface 24 of each drum member 4b and pushes the drum member 4b. The roller is turned outwardly about the pin 20 to become circular, and when the outer plate 4c is turned counterclockwise in the circular state, the front face 25a is out of the contact surface 24 and the drum members 4b are pin 20. It pivots inwardly around the axis. The cam 25 acting as this is shaped so that the opposite surface of the boss that pinches the boss 16 conforms to the contact surface 24. In the center thereof, a boss hole 26 is inserted to hold the boss 16 of the inner plate 4a.

Two inclined pins 27 are formed at the tip of the cam 25. These inclined pins 27 slide on the slope 19a of the pin groove 19 when the outer plate 4c is turned to the left and climb on the round bar 17 so that the outer plate 4c is moved from the drum member 4b. In the process of moving away the front surface 25a of the cam 25 out of the contact surface 24 of the drum member 4b so that the drum members 4b, which were kept in a circular shape, are pivoted in the center direction at the same time, and the outer plate When twisting (4c) to the right, it enters into the pin groove (19) from the round jaw (17) and is caught by its face (19b) to fix the circular recovery and the circular recovery state of the drum member (4b). The flat surface 25b of the short diameter formed between the front surfaces 25a is in contact with the contact surface 24 of the drum member 4b which is reduced in diameter, and serves as a stopper for limiting the width of the shaft diameter.

Then, on the outside of the portion where the outer plate (4c) is fitted in the main shaft (3) to loosen and tighten the nut fastened to the outer end of the main shaft (3) in order to replace the polishing ring 29 to the main shaft (3) and here A locking groove 3a is formed to fix the inner plate 4a and the drum member 4b of the inserted rotary drum 4 with the clamp so that it does not rotate clockwise and counterclockwise of the shaft.

The polishing ring 29, which covers the assembled drum member 4b so as to grind the blade or polishes the blade, is composed of an endless type that removes the flaw of the joint, which is rolled with one strip of sandpaper and overlapped and fixed at both ends. Each time it rotates, the seam is in contact with the blade or the blade to shake, so as to hinder the blade grind and to solve the disadvantage of lowering the blade grinding efficiency.

The inner surface of the polishing ring 29 is inserted into the cushion ring 30 to be fixed closely. The length of the polishing ring 29 is the same as the length of the drum member 4b, and the inner diameter of the cushion ring 30 does not cause the polishing ring 29 to roll when grinding the blade in the state fitted to the drum member 4b in a circular state. Decide on what you do.

In Fig. 4, the angled tool groove 28 formed at the center of the outer surface of the outer plate 4c, for example, hexagonal or the like, turns the drum member 4b by turning the outer plate 4c to the left or right with a tool such as a hexagon spanner. It is used to reduce or return to circular shape.

In Fig. 5, in the state in which the cam 25 is rotated clockwise in the figure, the front face 25a pushes the drum members 4b while forcibly contacting the contact surface 24 of each drum member 4b. The drum member 4b is rotated outward with respect to the pin 20 at its respective position to form a circular shape so as to be tensioned by opening the polishing ring 29 covered thereon. Then, the inclined pin 27 crawls as if the vertex portion slides on the slope 19a of the pin groove 19, and the outer plate 4c is pushed toward the drum member 4b while the inner surface thereof is the outer side of the drum member 4b. It is in close contact with the stage. This series of movements stops as soon as the back surface of the inclined pin 27 touches the face 19b of the pin groove 19. In this way, the drum member 4b, which has been reduced in diameter, is enlarged to fix the polishing ring 29, and then the nut is fastened to the outer end of the main shaft 3 to stabilize the drum member 4b and the outer plate 4c, and the knife is sharpened. We work on building scissors blade.

As shown in FIG. 6, when the nut is loosened and the cam 25 is turned counterclockwise in the state of FIG. 5, the front surface 25a is out of the contact surface 24 of each drum member 4b and the inclined pin 27 is a pin groove ( The outer plate 4c withdraws from the drum member 4b by the height of the inclined pin 27 while climbing the slope 19a on the slope 19a. And the drum member 4b is pivoted inwardly about the pin 20 at each position and is reduced. In this state, the outer plate 4c is lifted out, and the polishing ring 29 having reached the end of its service life according to the shaft diameter is removed and replaced with a new one, and then reassembled in the same manner as in FIG. 5 to prepare for use.

On the other hand, if the rotating drum (4) is rotated by the force when loosening and tightening the nut fastened to the outer end of the main shaft (3) in order to load the grinding ring 29 or replace the old one with a new one in the electric knife grinder. The rotating drum (4) must be held by hand to prevent it from turning. This is inconvenient. Thus, the electric knife grinder is equipped with a drum lock that locks the rotating drum 4 without turning in this case.

7 relates to a drum lock. The drum lock device includes the drive clutch 32, the driven clutch 33, the lever 34, the catch 35, the catch shaft 36, and the lever spring, including the lock groove 3a of the spindle 3 described above. 37) and the blade receiving surface locking surface (9e) of the multi-face cam (9).

The blade restraint surface 9e is formed at a portion occupied by a plurality of 1 to 4 stage cam faces 9a to d which determine the advancement width of the blade rest 10 in the multi-face cam 9, and dedicates the remaining seat. When (4) is locked, the front end 13 of the cam hole 12 perforated on the blade base 10 lowered at the same time is fixed to prevent retreat.

The drive clutch 32 is fixedly shaft-fitted to the rear end of the camshaft 8 to transmit its rotational force to the driven clutch 33 side. The driven clutch 33 loosely fits outside of the drive clutch 32 so that it can move separately in the camshaft 8.

The lever pin 38 is attached in the same direction as the camshaft 8 to the inside of the free end of the lever 34 to which the upper end is attached to the driven lever 33, and is synchronized. The lever pin 38 is necessary for dynamically connecting the free end of the catch 35 and the free end of the catch 35. In the waist portion of the lever 34, a hole 34a for fitting and fixing the inner end 37a of the lever spring 37 is drilled. The lever 34 also has a switch cam 39. The switch cam 39 contacts the terminal of the limit switch that electrically cuts off the motor when the polishing ring 29 is loaded or replaced.

The fastener 35 pivots from left to right around the shaft hole 35a at the bottom and locks or releases the main shaft 3, and the free end substantially locks the locking groove 3a of the main shaft 3. The pin groove 35c in which the locking groove 35b and the lever pin 38 act is formed. The clamping shaft 36 loosely fits the shaft hole 35a of the clamping member 35 in a state in which the clamping shaft 36 is installed between both supporting plates 2 at the lower end of the radius of the rotating drum in the main shaft 3.

In the state where the lever spring 37 is fitted to the outer camshaft 8 portion of the driven clutch 33, the outer end 37b is hooked to the blade support bar 39 provided in front of the camshaft 31 and the inner end 37a. ) Is cut into a hole 34a drilled in the waist of the lever 34. At this time, the lever spring 37 is placed above and below the line connecting the center of the camshaft 8 and the center of the lever pin 38 to the inner end 37a in the state in which the rotating drum 4 is locked or unlocked. As soon as the stage 37a crosses the line, elasticity is directed toward it to stabilize the lever 34.

A blade support cam 40 is installed between the multi-face cam 9 and the drive clutch 32. The cam 40 lowers the front of the blade holder 10 when grinding the blade of the knife or scissors, so that the blade or the blade guided therein can easily come into contact with the polishing ring 29, and the polishing ring 29 When loading or replacing, it is intended to facilitate the loading and replacement of the polishing ring 29 by lifting the front of the blade support 10 to widen the space between the vertices of the rotating drum 4.

The top dead center portion of the cam 40 is formed in a section at the bottom dead center of the locking surface 9e from the boundary with the top cam surface 9d of the multi-face cam 9 located in front of the locking surface 9e. 9e) from the start of the blade stand (10) is lifted and stayed in that position even after being locked. Reference numeral 31 denotes a knob attached to the outer end of the camshaft 8 exposed through the support plate 2.

In FIG. 8, the limit switch 41 provided on the rear support plate 2 of the lever 34 is electrically connected to the motor 5, and the free end of the terminal pressing plate 42 is a switch cam of the lever 34. 39) at all times. When the rotating drum 4 is locked, the pressure of the terminal pressing plate 42 against the terminal is weakened by the lever 34 pivoting forward, and the motor 5 is disconnected as the limit switch 41 is turned off. Therefore, the polishing ring 29 can be replaced and loaded with confidence. In addition, when the lock state of the rotating drum 4 is released, the lever 34 is turned backwards, and the terminal press plate 42 is pressed to press the terminal to turn on the limit switch 39 so as to energize the motor 5. Let's go.

As shown in the drawing, any cam surface of the first to fourth cam surfaces 9a to d of the multi-face cam 9 is in contact with the distal end 13 while the rotating drum 4 is free. ) Is retracted, and the lower support surface 10 of the cam 40 lowers as the lower surface of the support base 10 comes into contact. Since the terminal pressing plate 42 pressed by the switch cam 39 of the lever 34 retracted by pressing the terminal of the limit switch 41, the motor 5 is energized to polish the blade of the knife or scissors. There is a number.

In FIG. 9, turning the knob 31 counterclockwise in the figure also rotates the camshaft 8, the drive clutch 32, and the cam 40 in that direction. The drive clutch 32 interlocks the driven clutch 33 in the rotational direction thereof. By the lever 34 interlocked in the same direction as the driven clutch 33, the clamping mechanism 35 pivots about the clamping shaft 36 clockwise. Then, the locking groove 35b approaches the locking groove 3a of the main shaft 3 and hangs. At this time, if the locking groove 3a is not fixed at the position of the multi-locking groove 35b and the main shaft portion 3b between the locking grooves 3a is caught, turn the rotating drum 4 slightly to the left or right. The main surface locking groove 3a is locked to the locking groove 35b. At the same time, the locking surface 9e hangs the tip 13 of the cam hole 12 so that the blade holder 10 cannot be backed out. Blade stand 10 can no longer go out. This is because the front end 13 of the cam hole 12 is caught behind the supporting rod 7a. The limit switch 41 cuts off the current flowing to the motor 5 as the pressed state of the terminal presser plate 42 is relaxed by the lever 34 pivoting forward.

Locking the rotating drum 4 and the blade support 10 is raised as shown in the virtual diagram of Figure 9 to lift the motor (5) in the middle while lifting the outer plate 4c of the rotating drum (4) and the drum member Reduce (4b) to load or replace the polishing ring (29).

As described above, the electric knife grinder according to the present invention uses a seamless belt-shaped sandpaper grinding ring, so that the grinding work is very quiet and efficient when grinding a knife or scissors blade, and the impact on the arm is greatly reduced. Also very comfortable.

In addition, since the rotating drum can be locked by the locking device when the polishing ring is detached, the polishing ring can be replaced more safely.

Claims (1)

Rotating drum (4) installed between the support plate (2) of the base plate (1) and installed on the main shaft (3) driven by the motor (5), staggered vertically on the support plate (2) in front of the rotating drum (4) It is installed on the camshaft (8) between the horizontal support rod (6) for supporting the support (14) and the support for the support (15), and the support rods (7a, b) provided on the rear upper end of the rotary drum (4) at the support plate (2). Multi-faceted cam 9 for reinforcing and receiving the blade stand and the supporting springs 7a and b are maintained by tension springs 11a and b, and the cam faces 9a to d of the multi-face cam 9 In what consists of the blade base 10 which has the front-end | tip 13 of the cam hole 12 in contact, A main shaft 3 having a locking groove 3a that is locked to the catch 35 of the rotating drum lock; The contact surface for the cam 25 which is slightly smaller than the circumference and is supported by the pin 20 on the inner plate 4a and is capable of shaft diameter and circular recovery according to the cam operation of the circular inner plate 4a and the outer plate ( 24 and a pair of drum members 4b having protruding surfaces 24a and shaft 25 and circular recovery operation cams 25 of the drum members 4b and a combination of an outer plate 4c having a control panel 19c. A rotating drum 4; An endless polishing ring (29) having a cushion ring (30) inserted therein and mounted to the rotary drum (4); The lever 35 and the lever provided on the clamping shaft 36 on the support plate 2 so as to be interlocked with the drive clutch 32 and the lever 34 integral driven clutch 33 installed on the camshaft 8 and the lever 34. Electric knife grinder, characterized in that consisting of a rotating drum locking device consisting of a lever spring 37 for stabilizing the position of the 34 and the blade restraint surface (9e) of the multi-face cam (9).