CN114590060A

CN114590060A - Hob assembly and pencil sharpener

Info

Publication number: CN114590060A
Application number: CN202210399669.7A
Authority: CN
Inventors: 雪松
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2022-06-07

Abstract

The application discloses hobbing cutter subassembly and cut a ware includes: hobbing cutter and dabber, the hobbing cutter surface laid the helical blade, the hobbing cutter on be provided with the centre bore, the centre bore including the hole terminal surface that is located hobbing cutter terminal surface department and be located two downthehole sections between the hole terminal surface, the diameter of hole terminal surface suit with the diameter of dabber, the diameter of the diameter ratio hole terminal surface of downthehole section big at least 0.05mm, the dabber pass the centre bore and install on the hobbing cutter. The components are optimized, a shaft sleeve and a gear are omitted, and the production cost is reduced; can be used for forming a small pencil sharpener.

Description

Hob assembly and pencil sharpener

Technical Field

The application relates to the field of pencil sharpeners, in particular to a hob assembly and a pencil sharpener.

Background

With the continuous development of economy, the continuous progress of society, the continuous innovation of science and technology and the continuous improvement of the living standard of people, more and more abundant office supplies are provided for people, and the pencil sharpener is one of a plurality of office supplies. As is well known, the appearance of the pencil sharpener provides great convenience for people to sharpen pencils, so that the time for people to sharpen pencils is saved, and therefore, the pencil sharpener is more and more favored by people.

At present, for the existing pencil sharpener, the structure of the hob assembly is as shown in fig. 1: the hob comprises a hob body 01, a mandrel 02, a shaft sleeve 04 and a gear 05, wherein a center hole 03 for tightly matching the gear 05 and the shaft sleeve 04 is machined in the center of the hob body 01, and the shaft sleeve 04 and the gear 05 are tightly connected at two ends of the center hole 03. The mandrel 02 sequentially penetrates through the gear 05, the hob body 01 and the shaft sleeve 04 to realize the assembly of the hob assembly.

The aperture of the central hole of the existing hob is the outer diameter of the shaft sleeve, and the diameter of the mandrel is the inner diameter of the shaft sleeve, that is to say, the aperture of the central hole is larger than the diameter of the mandrel. The mandrel is arranged in a central hole of the hob and needs to be realized by matching of a gear and a shaft sleeve. Obviously, the hob assembly formed by a plurality of parts has relatively high production cost and assembly cost. In addition, the radius of the hob is equal to the wall thickness of the whole hob (including the cutting edge) + the wall thickness of the shaft sleeve + the radius of the mandrel. In order to ensure the structural strength of each part, the wall thickness or the radius of each part cannot be infinitely small, so that the diameter of the existing hob is also within the range of 9mm-15mm, the diameter of the hob cannot be further reduced, and an ideal portable mini pencil sharpener cannot be formed.

Disclosure of Invention

The hob assembly and the pencil sharpener are optimized to form parts, a shaft sleeve and a gear are omitted, and production cost is reduced; can be used for forming a small pencil sharpener.

The technical scheme adopted by the application is as follows: a hob assembly comprising: hobbing cutter and dabber, the hobbing cutter surface laid the helical blade, the hobbing cutter on be provided with the centre bore, the centre bore including the hole terminal surface that is located hobbing cutter terminal surface department and be located two downthehole sections between the hole terminal surface, the diameter of hole terminal surface suit with the diameter of dabber, the diameter of downthehole section big at least 0.05mm than the diameter of hole terminal surface, the dabber pass the centre bore and install on the hobbing cutter.

Compared with the prior art, the processing method has the advantages that the shaft sleeve and the gear are omitted, parts needing to be processed are reduced, and the processing cost is reduced. Directly install the dabber in the hobbing cutter when the assembly, saved the installation step of axle sleeve with the gear, reduced the assembly cost of this application. In mounting the entire hob assembly in the sharpener, a section of the helical cutting edge is used to engage the gear ring. Because the shaft sleeve and the gear are omitted in the whole hob assembly, the wall thickness of the shaft sleeve does not need to be considered when the diameter of the hob is designed, the diameter of a central hole of the hob can be further reduced, and if the wall thickness of the corresponding hob is not changed, the diameter of the whole hob is further reduced. Therefore, the hob body and the corresponding pencil sharpener can be designed into a mini type, the material cost is reduced by times, and the pencil sharpener is convenient to carry.

It should be noted that, if the whole central hole is simply of a cylindrical structure. In practical tests, powder generated by planing the pencil can enter the central hole along a gap between the central hole and the mandrel, so that the hob and the mandrel are blocked, and the hob cannot work normally. This application sets up the diameter ratio of downthehole section and the diameter of hole terminal surface and is big 0.05mm at least, and the diameter of hole terminal surface suits with the diameter of dabber. Make the dabber assemble to the centre bore of hobbing cutter on, porose terminal surface carries on spacingly to the dabber promptly, ensures the axiality of dabber and hobbing cutter, ensures the precision of planing of this application when planing the pencil. And the inner section with the holes ensures that the inner wall of the hob and the peripheral surface of the mandrel keep away from the space, so that the mandrel and the hob cannot be blocked due to the entering of a small amount of powder to influence the normal work of the hob. Compare in columniform centre bore structure, the contact surface between dabber and the hobbing cutter of this application is little, and frictional force is little between dabber and the hobbing cutter.

In some embodiments of the present application, the central bore is located along the central axis of the roller cutter. The axis of the central hole and the axis of the hob are positioned on the same straight line.

In some embodiments of the present application, the central hole has a drum-shaped structure, and the cross section of the inner section of the hole has a curved section. That is, in the central hole, the maximum value of the diameter of the central hole is positioned in the inner section of the hole, and the diameter of the end face of the hole is the minimum value of the whole central hole. The forming of the drum-shaped hole is the prior art in the field of hole processing, and specifically, punch forming can be adopted. Specifically, the diameter of the central bore will be at its maximum approximately two thirds of the way through the central bore.

Preferably, a small scale hob assembly is formed. The diameter of the mandrel is 2.5 mm-5 mm, and the difference between the diameter of the maximum position of the central hole and the diameter of the minimum position of the central hole is 0.05 mm-0.35 mm. Correspondingly, the diameter of the hob is 6.5 mm-15 mm.

In some embodiments of the present application, the central hole stepped hole structure is described. The central hole comprises a hole end section and a hole inner section, wherein the hole end section is located on the hole end face, the hole inner section is located between the two hole end sections, the cross section of the hole end section is a straight line section, the cross section of the hole inner section is a straight line section, and the diameter of the hole end section is smaller than that of the hole inner section. In the same way, the forming of the stepped hole is the prior art in the field of hole processing, and specifically, punch forming can be adopted.

Preferably, the hob assembly is formed in small dimensions. The diameter of the mandrel is 2.5 mm-5 mm, and the difference between the diameter of the inner section of the hole and the diameter of the end section of the hole is 0.05 mm-0.35 mm. Correspondingly, the diameter of the hob is 6.5 mm-15 mm.

In the small-sized hob assembly in the prior art, the diameter of a hob is 9mm-15 mm. If the diameter of the mandrel is 3mm, the wall thickness of the corresponding shaft sleeve is 1.25mm, the wall thickness of the hob is 0.9mm, the tooth depth of the spiral blade is 1.3mm, and the diameter of the formed hob assembly is 9.7 mm. The diameter of the mandrel is 4mm, the wall thickness of the corresponding shaft sleeve is 1.5mm, the wall thickness of the hob is 1mm, the tooth depth of the spiral blade is 1.5mm, and the forming diameter of the hob component is 12 mm. The diameter of the mandrel is 5mm, the wall thickness of the corresponding shaft sleeve is 1.5mm, the wall thickness of the hob is 1.7mm, the tooth depth of the helical blade is 1.8mm, and the diameter of the formed hob assembly is 15 mm.

And this application can accomplish the diameter that adopts the dabber to be 3mm, and hobbing cutter wall thickness is 1mm, and the helical cutting edge tooth depth is 1.3mm, and the shaping diameter is 7.6 mm's hobbing cutter subassembly.

It will be apparent that reference to the thickness of the wall of the hob in this application is the thickness of the wall of the hob excluding the portion of the helical cutting edge.

The utility model provides a pencil sharpener, includes ring gear, knife rest and hobbing cutter subassembly, the hobbing cutter subassembly install on the knife rest, the ring gear cover establish outside the hobbing cutter, ring gear and hobbing cutter meshing.

In some embodiments of the present application, the tool holder is disposed on the gear ring and can rotate relative to the gear ring, a plurality of tooth claws matched with the helical blades are disposed on the inner peripheral wall of the gear ring at intervals, and the hob is rotatably matched with the gear ring through the engagement of the helical blades and the tooth claws.

In some embodiments of the present application, a connecting seat connected to the driving mechanism is disposed at an end of the tool holder away from the gear ring, and a slot for inserting the output shaft of the driving mechanism is disposed on the connecting seat.

Drawings

The present application will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of illustrating the preferred embodiments and therefore should not be taken as limiting the scope of the present application. Furthermore, unless specifically stated otherwise, the drawings are merely schematic representations based on conceptual representations of elements or structures depicted and may contain exaggerated displays and are not necessarily drawn to scale.

FIG. 1 is a schematic diagram of a prior art hob assembly;

FIG. 2 is a schematic view of a portion of the construction of the sharpener of the present application;

FIG. 3 is a schematic structural view of the hob assembly of the present application;

FIG. 4 is a first cross-sectional view of the hob of the present application;

fig. 5 is a second cross-sectional view of the hob of the present application.

Wherein the reference numerals are specified as follows: 1. hobbing cutters; 2. a mandrel; 3. a helical cutting edge; 4. a central bore; 41. a bore end face; 42. an intra-bore section; 43. a bore end section; 5. a tool holder; 6. a gear ring; 7. a toothed claw; 8. a connecting seat; 9. and (4) a slot.

Detailed Description

The present application will now be described in detail with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

A hob 1 assembly, an embodiment of which is shown in fig. 3 to 5: the method comprises the following steps: hobbing cutter 1 and

dabber

2, 1 surface of hobbing cutter laid spiral blade 3, hobbing cutter 1 on be provided with centre bore 4, centre bore 4 including the hole terminal surface 41 that is located 1 terminal surface department of hobbing cutter and be located two downthehole sections 42 between the hole terminal surface 41, the diameter of hole terminal surface 41 big at least 0.05mm than the diameter of hole terminal surface 41, the diameter of downthehole section 42 be greater than the diameter of hole terminal surface 41, dabber 2 pass centre bore 4 and install on hobbing cutter 1. Make dabber 2 assemble on hobbing cutter 1's centre bore 4, porose terminal surface 41 carries on spacingly to dabber 2 promptly, ensures dabber 2 and hobbing cutter 1's axiality, ensures the precision of planing when this application is planing the pencil. The inner section 42 with holes makes the inner wall of the hob 1 and the circumferential surface of the mandrel 2 keep away from each other, so that the mandrel 2 and the hob 1 are not blocked by a small amount of powder, and the normal operation of the hob 1 is not affected. Compare in 4 structures of columniform centre bore, the contact surface between 2 and the hobbing cutter 1 of dabber of this application is little, and frictional force is little between 2 and the hobbing cutter 1 of dabber.

Compared with the prior art, the processing method has the advantages that the shaft sleeve and the gear are omitted, parts needing to be processed are reduced, and the processing cost is reduced. When the hob is assembled, the mandrel 2 is directly installed in the hob 1, the installation steps of the shaft sleeve and the gear are omitted, and the assembly cost of the hob is reduced. Because the shaft sleeve and the gear are omitted in the whole hob 1 assembly, the diameter of the central hole 4 of the hob 1 can be further reduced without considering the wall thickness of the shaft sleeve when designing the diameter of the hob 1, and if the wall thickness of the corresponding hob 1 is not changed, the diameter of the whole hob 1 is further reduced. Therefore, the hob 1 body and the corresponding pencil sharpener can be designed to be mini-type, the material cost is reduced by times, and the carrying is convenient.

In the second embodiment, as shown in fig. 4, the central hole 4 is arranged along the central axis of the hob 1. The axis of the central hole 4 and the axis of the hob 1 are positioned on the same straight line.

The central hole 4 is a drum-shaped structure, and the cross section of the inner section 42 of the hole is a curve section. That is, in the center hole 4, the diameter maximum of the center hole 4 is located at the hole inner section 42, and the diameter of the hole end face 41 is the minimum of the entire center hole 4. The drum-shaped hole forming is the prior art in the field of hole processing, and can specifically adopt punch forming. Preferably, a small hob 1 assembly is formed. The diameter of the mandrel 2 is 2.5 mm-5 mm, and the difference value between the diameter of the maximum position of the central hole 4 and the diameter of the minimum position of the central hole 4 is 0.05 mm-0.35 mm. Correspondingly, the diameter of the hob 1 is 6.5 mm-15 mm.

In the small-sized hob 1 assembly in the prior art, the diameter of the hob 1 is 9mm-15 mm. If the diameter of the mandrel 2 is 3mm, the wall thickness of the corresponding shaft sleeve is 1.25mm, the wall thickness of the hob 1 is 0.9mm, the tooth depth of the spiral blade 3 is 1.3mm, and the hob 1 assembly with the forming diameter of 9.7mm is adopted. The diameter of the mandrel 2 is 4mm, the wall thickness of the corresponding shaft sleeve is 1.5mm, the wall thickness of the hob 1 is 1mm, the tooth depth of the spiral blade 3 is 1.5mm, and the hob 1 assembly with the forming diameter of 12mm is adopted. The diameter of the mandrel 2 is 5mm, the wall thickness of the corresponding shaft sleeve is 1.5mm, the wall thickness of the hob 1 is 1.7mm, the tooth depth of the spiral blade 3 is 1.8mm, and the hob 1 assembly with the forming diameter of 15mm is adopted.

And this application can accomplish the diameter that adopts dabber 2 to be 3mm, and 1 wall thickness of hobbing cutter is 1mm, and 3 tooth depths of helical cutting edge are 1.3mm, and the shaping diameter is 7.6 mm's 1 subassemblies of hobbing cutter.

It is clear that the thickness of the wall of the hob 1 referred to in this application is the thickness of the part of the hob 1 excluding the cutting edges 3.

The other contents of the second embodiment are the same as those of the first embodiment.

The third embodiment is the same as the second embodiment in other points: as shown in fig. 5, the central hole 4 has a stepped hole structure. The central bore 4 comprises a bore end section 43, in which the bore end face 41 is located, and a bore section 42, which is located between the two bore end sections 43, the bore end section 43 having a straight section in cross-section, the bore section 42 having a straight section in cross-section, the bore end section 43 having a smaller diameter than the bore section 42. In the same way, the forming of the stepped hole is the prior art in the field of hole processing, and specifically, punch forming can be adopted.

Preferably, a small-sized hob 1 assembly is formed. The diameter of the mandrel 2 is 2.5 mm-5 mm, and the difference between the diameter of the hole inner section 42 and the diameter of the hole end section 43 is 0.05 mm-0.35 mm. Correspondingly, the diameter of the hob 1 is 6.5 mm-15 mm.

The utility model provides a pencil sharpener, as shown in fig. 3, includes ring gear 6, knife rest 5 and hobbing cutter 1 subassembly, hobbing cutter 1 unit mount on knife rest 5, ring gear 6 cover establish outside hobbing cutter 1, ring gear 6 and hobbing cutter 1 meshing.

In some embodiments of the present application, the hob head 5 is arranged on the gear ring 6 and can rotate relative to the gear ring 6, a plurality of tooth claws 7 matched with the helical blades 3 are arranged on the inner peripheral wall of the gear ring 6 at intervals, and the hob 1 is rotationally matched with the gear ring 6 through the engagement of the helical blades 3 and the tooth claws 7.

In some embodiments of the present application, a connecting seat 8 for connecting the driving mechanism is disposed at an end of the knife rest 5 away from the gear ring 6, and a slot 9 for inserting the output shaft of the driving mechanism is disposed on the connecting seat 8.

The present application has been described in detail above, and specific examples thereof are used herein to explain the principles and implementations of the present application, which are presented solely to aid in understanding the present application and its core concepts. It should be noted that, for those skilled in the art, without departing from the principle of the present application, the present application can also make several improvements and modifications, and those improvements and modifications also fall into the protection scope of the claims of the present application.

Claims

1. A hob assembly, characterized in comprising: hobbing cutter (1) and dabber (2), hobbing cutter (1) surface laid spiral blade (3), hobbing cutter (1) on be provided with centre bore (4), centre bore (4) including be located hobbing cutter (1) terminal surface department hole terminal surface (41) and be located two downthehole sections (42) between hole terminal surface (41), the diameter of hole terminal surface (41) suit with the diameter of dabber (2), the diameter of downthehole section (42) big 0.05mm at least than the diameter of hole terminal surface (41), dabber (2) pass centre bore (4) and install on hobbing cutter (1).

2. A hob assembly according to claim 1, characterized in, that said central hole (4) is arranged along the central axis of the hob (1); the axis of the central hole (4) and the axis of the hob (1) are positioned on the same straight line.

3. A roller assembly according to claim 1, characterized in that said central bore (4) is of a drum-shaped configuration, said inner bore section (42) being of a curved cross-section; the maximum diameter of the central hole (4) is positioned in the hole inner section (42), and the diameter of the hole end face (41) is the minimum value of the whole central hole (4).

4. A roller assembly according to claim 3, characterized in that the diameter of the mandrel (2) is 2.5mm to 5mm, and the difference between the diameter of the largest part of the central bore (4) and the diameter of the smallest part of the central bore (4) is 0.05mm to 0.35 mm; the diameter of the hob (1) is 6.5 mm-15 mm.

5. A hob assembly according to claim 1, characterized in, that said central hole (4) is a stepped hole structure; the central hole (4) comprises a hole end section (43) where the hole end face (41) is located and a hole inner section (42) located between the two hole end sections (43), the cross section of the hole end section (43) is a straight line section, the cross section of the hole inner section (42) is a straight line section, and the diameter of the hole end section (43) is smaller than that of the hole inner section (42).

6. The hob assembly according to claim 5, characterized in, that the diameter of the mandrel (2) is 2.5mm to 5mm, the diameter of the bore inner section (42) differs from the diameter of the bore end section (43) by 0.05mm to 0.35 mm; the diameter of the hob (1) is 6.5 mm-15 mm.

7. A roller cutter assembly according to claim 4 or 6, characterized in that the diameter of the mandrel (2) is 3mm, the wall thickness of the roller cutter (1) is 1mm, the depth of the cutting edge (3) of the spiral is 1.3mm and the diameter of the roller cutter (1) assembly is 7.6 mm.

8. A pencil sharpener, characterized in that, including gear ring (6), tool rest (5) and the hobbing cutter (1) subassembly as in any claim 1-7, the hobbing cutter (1) subassembly install on tool rest (5), gear ring (6) cover establish outside hobbing cutter (1), gear ring (6) and hobbing cutter (1) meshing.

9. A pencil sharpener according to claim 8, characterized in that the holder (5) is arranged on the gear ring (6) and can rotate relative to the gear ring (6), a plurality of claws (7) matching with the helical cutting edge (3) are arranged on the inner peripheral wall of the gear ring (6) at intervals, and the hob (1) is rotationally matched with the gear ring (6) through the engagement of the helical cutting edge (3) and the claws (7).

10. The pencil sharpener as claimed in claim 9, wherein a connecting seat (8) for connecting the driving mechanism is arranged at one end of the cutter holder (5) far away from the gear ring (6), and a slot (9) for inserting an output shaft of the driving mechanism is formed in the connecting seat (8).