Pencil holder sharpening knife with replaceable blade

Abstract

The utility model discloses a blade-replaceable pencil sharpener which comprises a sharpener body and blades, the sharpener body is cylindrical, a sharpener shaft hole is formed in the center of the sharpener body, at least two blade installation parts are arranged on the outer circle face of the sharpener body, and each blade installation part is provided with one blade. The blade mounting part comprises a blade mounting groove, a screw mounting groove, a blade pressing block, a screw mounting hole and a locking screw, the blade comprises a base body part and a cutting part, the blade base body part is arranged in the blade mounting groove, the cutting part is welded and fixed to the blade base body part, and the blade base body part is locked and fixed through the blade pressing block; the blades are provided with the same base body parts, the cutting parts of the blades are divided into two sets in the direction of the center line of the cutter shaft hole, the two sets of cutting parts are staggered in the circumferential direction, and part of cutting edges of the two sets of cutting parts coincide. When one blade of the pencil holder sharpening cutter cannot be used, the blade can be replaced by a new blade to be continuously used, and the use cost of the cutter is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a wood cutting tool, especially a cutter with replaceable blades for processing wooden pencil rods. BACKGROUND

[0002] Wooden pencil rods are processed by a planing rod machine. A planing rod cutter is installed on a cutter shaft of the planing rod machine. The profile of the processed material is completed by two rows of planing rod cutters. Multiple rows of pencil rods are processed at one time. The shapes of the pencil rods include a circle, a hexagon, a triangle, and an oblate circle.

[0003] The blade edge of the planing rod cutter is designed in a profile. The edge has a row of tooth grooves similar to the profile of the pencil rod. The tooth tips are between the tooth groove openings.

[0004] Currently, users leave a very small distance between adjacent tooth grooves in order to save processing materials. The width of the tooth tip is less than 1 mm. The tooth tip is greatly consumed during blade processing. When a single blade cannot be used, the entire cutter needs to be discarded. SUMMARY

[0005] The utility model aims to provide a pencil planing rod cutter with replaceable blades. When one of the blades of the planing rod cutter cannot be used, the blade can be replaced with a new one. The cutter can continue to be used.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A pencil planing rod cutter with replaceable blades includes a cutter body and blades. The cutter body is cylindrical. The center of the cutter body is provided with a cutter shaft hole. The outer circular surface of the cutter body is provided with at least two blade mounting parts. Each blade mounting part is provided with one blade. The blade mounting part includes a blade mounting groove, a screw mounting groove, a blade pressing block, a screw mounting hole, and a locking screw. The blade includes a base body part and a cutting part. The blade base body part is arranged in the blade mounting groove. The cutting part is welded and fixed to the blade base body part. The screw mounting groove is arranged on the front side of the blade mounting groove. The blade pressing block is arranged in the screw mounting groove. The screw mounting hole is arranged on the lower part of the blade mounting groove. One end of the screw mounting hole extends to the screw mounting groove. The other end of the screw mounting hole extends to the outer circular surface of the cutter body. The locking screw passes through the screw mounting hole and cooperates with the screw hole of the blade pressing block. The blade base body part is locked and fixed by the blade pressing block.

[0008] All the blades have the same base body part. The cutting parts of all the blades are divided into two groups along the center line direction of the cutter shaft hole. The two groups of cutting parts are staggered in the circumferential direction. Part of the edges of the two groups of cutting parts coincide.

[0009] Further, the blade base body part and the rear side of the blade mounting groove of the cutter body are provided with positioning holes. The positioning holes are penetrated by positioning pins.

[0010] Further, the blade base part is provided with two triangular positioning holes, which are arranged vertically and symmetrically along the center line of the shaft hole.

[0011] Further, the blade base part is provided with a screw groove corresponding to the screw mounting hole.

[0012] Further, the blade base part is provided with a radial positioning groove, and the blade pressing block is provided with a positioning protrusion corresponding to the radial positioning groove.

[0013] Further, the blade material is cemented carbide.

[0014] Further, the blade material is cemented carbide.

[0015] Further, the number of the blade mounting parts is four or six. Advantages

[0016] 1) The pencil alloy planer bar cutter with replaceable blades can continue to be used after replacing the new blade when one of the blades cannot be used, without scrapping the entire cutter, effectively reducing the use cost of the cutter.

[0017] 2) The blades are divided into several groups of cutting teeth, which can effectively reduce the cutting resistance of single tooth.

[0018] 3) The axial positioning hole is matched with the positioning pin by using two vertically and symmetrically arranged triangular positioning holes, which can improve the axial positioning accuracy.

[0019] 4) The lighter aluminum alloy cutter body is more suitable for precision machining, and the machining precision of each station is less than 0.015mm. The light weight cutter body can reduce the motor power consumption. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a perspective view of the pencil planer bar cutter with replaceable blades of embodiment one.

[0021] Figure 2 It is a front view of the pencil planer bar cutter with replaceable blades of embodiment one.

[0022] Figure 3 It is a structure diagram of the cutter body of embodiment one.

[0023] Figure 4 It is a schematic view of the locking screw and the blade pressing block.

[0024] Figure 5 It is a schematic view of the positioning pin installation.

[0025] Figure 6 It is a schematic view of the blade composed of the first group of cutting parts and the base part.

[0026] Figure 7 Main view of the insert formed by the second group of cutting portions and the base portion.

[0027] Figure 8 Schematic view of the cutting profile of the first and second groups of cutting portions.

[0028] Figure 9 Main view of the pencil alloy shank cutter with the insert structure of the second embodiment.

[0029] In the figure: 1-cutter body; 2-insert; 2-1-base portion; 2-2-cutting portion; 3-cutter shaft hole; 4-insert mounting groove; 5-screw mounting groove; 6-insert pressing block; 7-screw mounting hole; 8-locking screw; 9-positioning pin; 10-positioning hole; 11-screw groove; 12-radial positioning groove. DETAILED DESCRIPTION

[0030] The utility model will be explained further in connection with the drawings. Embodiment one

[0031] As Figure 1 shown, the utility model relates to a pencil alloy shank cutter with an insert structure, which comprises a cutter body 1 and an insert 2. The cutter body 1 is made of aluminum alloy and has a cylindrical shape with a cutter shaft hole 3 in the center. The outer circular surface of the cutter body 1 is provided with six insert mounting portions, each of which is provided with one insert 2. The insert 2 is made of hard alloy.

[0032] As Figures 2 to 5 shown, the insert mounting portion comprises an insert mounting groove 4, a screw mounting groove 5, an insert pressing block 6, a screw mounting hole 7 and a locking screw 8. The insert 2 comprises a base portion 2-1 and a cutting portion 2-2. The base portion 2-1 of the insert 2 is arranged in the insert mounting groove 4, and the cutting portion 2-2 is welded and fixed to the base portion 2-1 of the insert. The screw mounting groove 5 is arranged on the front side of the insert mounting groove 4, and the insert pressing block 6 is arranged in the screw mounting groove 5. The screw mounting hole 7 is arranged at the lower part of the insert mounting groove 4, and one end of the screw mounting hole 7 extends to the screw mounting groove 5, while the other end extends to the outer circular surface of the cutter body 1. The locking screw 8 passes through the screw mounting hole 7 and cooperates with the screw hole of the insert pressing block 6 to lock and fix the base portion 2-1 of the insert 2.

[0033] As Figure 1 shown in Figs. 6 to 8, all the inserts 2 have the same base portion 2-1. The cutting portions 2-2 of all the inserts 2 are divided into two groups along the center line direction of the cutter shaft hole 3. The two groups of cutting portions 2-2 are staggered in the circumferential direction and partially overlap in the cutting edge. The overlapping size is D. The cutting profiles of the two groups of cutting portions 2-2 are combined to form a complete cutting profile similar to the profile size of a pencil shank.

[0034] As Figure 6 and 7 shown, the bottom of the blade 2 base part 2-1 is provided with a screw groove 11 corresponding to the screw mounting hole 7, so as to facilitate the installation of the locking screw 8. The middle of the blade 2 base part 2-1 is provided with a radial positioning groove 12, and the blade holder 6 is provided with a positioning protrusion corresponding to the radial positioning groove 1. After the blade holder 6 locks and fixes the blade 2, the radial positioning groove 12 of the blade 2 and the positioning protrusion of the blade holder 6 are matched with each other, so as to prevent the blade 2 from being offset in the radial direction of the tool body 1.

[0035] As Figure 3 shown, the blade 2 base part 2-1 and the rear side of the tool body provided with a positioning hole 10, and the positioning pin 9 is inserted into the positioning hole 10. The positioning pin 9 relatively fixes the blade 2 and the tool body 1, so as to prevent the blade 2 from being offset in the axial direction of the tool body 1, thereby ensuring the machining precision. In the embodiment, the blade 2 base part 2-1 is provided with two triangular positioning holes 10, which are arranged in the center line direction of the tool shaft hole 3 and vertically mirror-imaged. The two vertically mirror-imaged triangular positioning holes are matched with the positioning pin, so as to improve the axial positioning precision of the blade 2. Embodiment two

[0036] As Figure 9 shown, the difference between embodiment two and embodiment one is that the outer circular surface of the tool body 1 is provided with four blade mounting parts, and the four blade mounting parts are uniformly distributed along the outer circular surface of the tool body 1.

[0037] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A replaceable blade pencil shaver rod cutter, comprising a cutter body and a blade, the cutter body is cylindrical, a cutter shaft hole is arranged in the center of the cutter body, and an outer cylindrical surface of the cutter body is provided with at least two blade mounting portions, and one blade is arranged on each blade mounting portion; characterized in that: The blade mounting part comprises a blade mounting groove, a screw mounting groove, a blade pressing block, a screw mounting hole, a locking screw, the blade comprises a base part and a cutting part, the blade base part is arranged in the blade mounting groove, the cutting part is welded and fixed to the blade base part, the screw mounting groove is arranged at the front side of the blade mounting groove, the blade pressing block is arranged in the screw mounting groove, the screw mounting hole is arranged at the lower part of the blade mounting groove, one end of the screw mounting hole extends to the screw mounting groove, the other end extends to the outer cylindrical surface of the cutter body, the locking screw passes through the screw mounting hole and cooperates with the screw hole of the blade pressing block, and the blade base part is locked and fixed through the blade pressing block; All the blades have the same base part, the cutting parts of all the blades are divided into two groups along the center line direction of the cutter shaft hole, the two groups of cutting parts are staggered in the circumferential direction, and part of the cutting edges of the two groups of cutting parts coincide.

2. A replaceable blade pencil shavings rod cutter according to claim 1, characterized in that: The blade base part and the rear side of the blade mounting groove of the cutter body are provided with a positioning hole, and a positioning pin is inserted into the pin hole.

3. A replaceable pencil shavings rod cutter according to claim 2, characterized in that: The blade base part is provided with two triangular positioning holes, the two triangular positioning holes are arranged at intervals along the center line direction of the cutter shaft hole, and the two triangular positioning holes are vertically mirror arranged.

4. A replaceable pencil shavings rod cutter according to claim 1, characterized in that: The blade base part is provided with a screw groove corresponding to the screw mounting hole.

5. A replaceable pencil shavings rod cutter according to claim 1, characterized in that: The blade base part is provided with a radial positioning groove, and the blade pressing block is provided with a positioning protrusion corresponding to the radial positioning groove.

6. A replaceable pencil shavings rod cutter according to claim 1, characterized in that: The material of the blade is hard alloy.

7. A replaceable pencil shavings rod cutter according to claim 1, characterized in that: The material of the cutter body is aluminum alloy.

8. A replaceable pencil shavings rod cutter according to claim 1, characterized in that: The number of the blade mounting parts is four or six.

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