CN209738635U

CN209738635U - Pencil sharpener and cutting mechanism thereof

Info

Publication number: CN209738635U
Application number: CN201920177563.6U
Authority: CN
Inventors: 雪松
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-01-31
Filing date: 2019-01-31
Publication date: 2019-12-06
Anticipated expiration: 2029-01-31

Abstract

the utility model relates to a cutting mechanism of penknife, including gear seat, knife rest and hobbing cutter, the knife rest sets up on the gear seat with rotating, and the hobbing cutter setting is on the knife rest, is provided with the cutting edge that a plurality of top-down spirals extended and followed the circumference interval arrangement of hobbing cutter on the periphery wall of hobbing cutter, and the interval is provided with a plurality ofly and cutting edge assorted tooth claw on the internal perisporium of gear seat, and the hobbing cutter passes through the meshing of cutting edge and tooth claw and with gear seat normal running fit. The cutting edge is directly matched with the tooth claw, so that the number of parts is reduced, the whole cutting structure is simplified and efficient, and the failure rate is greatly reduced; on the other hand, after the transmission gear is omitted, a gap between the transmission gear and the hob does not exist, so that the residue of scraps of the pencil after cutting can be reduced, the bouncing of the transmission gear and the hob is avoided, the stability is improved, the cutting hand feeling is more stable, the noise during cutting is greatly reduced, and multiple purposes are achieved; in addition, the utility model also relates to a pencil sharpener with the cutting mechanism.

Description

Pencil sharpener and cutting mechanism thereof

Technical Field

The utility model relates to a pencil sharpener field especially relates to a pencil sharpener's cutting mechanism and pencil sharpener.

Background

The pencil sharpener is a common stationery, and when the pencil sharpener enters the market at the earliest time, the pencil sharpener is only a most basic pencil sharpening tool, however, with the increase of the pencil use demand, people have higher requirements on the pencil sharpening quality and speed of the pencil sharpener, so that the pencil sharpener for automatically sharpening the pencil is developed, at present, no matter the pencil sharpener is of a hand-operated type or an electric type, the core pencil sharpening structure is that a bracket and a hob are arranged inside a shell, a rotating shaft penetrates through the hob to connect the hob to the bracket, a transmission gear meshed with a driving device is also arranged on the hob, for example, the improved structure of the cutter core shaft lever of the pencil sharpener cutting mechanism of Chinese utility model with the patent number of CN201420577786.9 discloses the pencil sharpener, the pencil sharpener comprises a cutter holder bracket, a spiral cutter and a cutter core shaft lever, and a cutting groove is arranged at the bottom end of the cutter holder bracket, both sides end is equipped with hollow pivot ear and has the location ear of pivot hole respectively suddenly, and the helical cutting sword passes through the sword axle lever to be fixed between the pivot ear and the location ear of blade holder support, and the assembly of above-mentioned hobbing cutter and support needs hobbing cutter body, drive gear, pivot and the retaining member that is used for fixed pivot to constitute promptly, and this kind of cutting mechanism is though comparatively general use in hand formula or electrodynamic type's pencil sharpener, still has certain defect:

1. In the whole pencil sharpener, the support and the hob are installed by matching a plurality of parts, and the core matching structure of the pencil sharpener is still complex, so that the failure rate and the maintenance difficulty are increased, and the production cost is also increased;

2. The assembly gaps exist among the parts, and lead powder and sawdust powder remained after pencil sharpening can be filled in the gaps, so that the cleaning difficulty is increased, the abnormal abrasion of the tool bit can be caused in the past for a long time, and the service life of the whole pencil sharpener is shortened;

3. The gaps between the transmission gear and the hob can cause the hob to jump back and forth in the rotating process, and the jumping directly causes great noise during pencil sharpening, so that the use experience is poor.

SUMMERY OF THE UTILITY MODEL

the utility model discloses the first technical problem that will solve is the current situation to prior art, provides a simple structure part few, be convenient for clear up and the little cutting mechanism of penknife of noise.

The second technical problem to be solved of the present invention is to provide a pencil sharpener with the above-mentioned cutting mechanism.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a cutting mechanism of penknife, includes gear seat, knife rest and the hobbing cutter that is used for cutting the pencil, the knife rest sets up on gear seat and can rotate relative gear seat, the hobbing cutter sets up on the knife rest, be provided with a plurality of cutting edges on the periphery wall of hobbing cutter, each cutting edge top-down spiral winding and along the circumference interval arrangement of hobbing cutter, the interval is provided with a plurality ofly and cutting edge assorted prong on the internal perisporium of gear seat, the hobbing cutter passes through the meshing of cutting edge and prong and with gear seat normal running fit.

Preferably, the helix angle β of each cutting edge with respect to the central axis of the hob is in the range of 35 ° to 40 °, the installation angle α of the hob with respect to the rotation axis of the hob holder is in the range of 10 ° to 15 °, and the inclination angle β - α of the tooth claw with respect to the axis of the gear holder is in the range of 20 ° to 30 °.

or the spiral angle beta of each cutting edge relative to the central axis of the hob is 28-34 degrees, the installation included angle alpha of the hob relative to the rotating shaft of the hob holder is 10-15 degrees, and the inclination angle beta-alpha of the tooth claw relative to the axis of the gear seat is 13-24 degrees.

In particular, the angle of inclination of the pawl with respect to the axis of the gear seat is 25 ° or 18 °

In order to ensure the assembly of the hob and the hob holder and reduce the number of parts to be assembled, a first convex part and a second convex part are convexly arranged at two ends of the hob, a through hole for the first convex part to pass through is formed in one end, adjacent to the gear seat, of the hob holder, a groove for the second convex part to be accommodated in is formed in the other end of the hob holder, and two ends of the hob are rotatably connected to the hob holder through the matching of the first convex part and the through hole and the matching of the second convex part and the groove.

In order to prevent the hob from separating from the tool rest when rotating, the tool rest is further provided with a limiting piece for limiting the second convex part from separating from the groove.

In order to ensure that the limiting part is firmly limited on the hob, the limiting part is a limiting ring with an opening, the limiting ring is sleeved on the hob holder, and the first end of the limiting ring can cover or partially cover the groove.

In order to ensure that the hob assembled on the tool rest can cut a pencil, a cutting groove for inserting the pencil to be cut is axially formed in the tool rest, an opening for inserting the pencil into the cutting groove is formed in the gear seat, and the opening is communicated with the cutting groove; the hob is obliquely arranged from one end, close to the gear seat, of the hob holder to one end, far away from the gear seat, and the end, far away from the gear seat, of the hob can be partially accommodated in the cutting groove in a state that the hob is assembled on the hob holder.

in order to ensure that the driving mechanism can be connected with the tool rest, a connecting seat for connecting the driving mechanism is arranged at one end, away from the gear seat, of the tool rest, and a slot for inserting an output shaft of the driving mechanism is formed in the connecting seat.

In order to ensure that the output shaft of the driving mechanism cannot slip when the tool rest is driven, furthermore, a plurality of limiting convex ribs which are arranged at intervals along the circumferential direction and can limit the tool rest to rotate relative to the output shaft of the driving mechanism are arranged on the inner circumferential wall of the slot, and the limiting convex ribs are formed by extending inwards along the radial direction of the slot.

A pencil sharpener with a cutting mechanism comprises a driving mechanism and a transmission piece, wherein the power output end of the driving mechanism is connected with one end of the transmission piece, and the other end of the transmission piece is connected with a knife rest and can drive the knife rest to rotate relative to a gear seat.

Compared with the prior art, the utility model has the advantages of: this cutting mechanism of penknife, including the gear seat, the cutter frame with can with wait to cut the hobbing cutter that the tip of pencil contacted, the cutter frame sets up on the gear seat and can rotate relative to the gear seat, the hobbing cutter sets up on the cutter frame, be provided with a plurality of cutting edges on the periphery wall of hobbing cutter, each cutting edge top-down spiral extends, and along the circumference interval arrangement of hobbing cutter, the interval is provided with a plurality of and cutting edge assorted prong on the internal perisporium of gear seat, the hobbing cutter passes through the meshing of cutting edge and prong and with gear seat normal running fit. The hob is driven to rotate by directly meshing the hob teeth of the hob and the tooth claws of the gear seat, so that a transmission gear is omitted, the number of parts is reduced on one hand, the whole cutting mechanism is simplified and efficient, and the failure rate is greatly reduced; on the other hand, after the transmission gear is omitted, a gap between the transmission gear and the hob does not exist, so that the residual scraps of the pencil after cutting can be reduced, the phenomenon that the transmission gear and the hob jump up is avoided, the stability is improved, the cutting hand feeling is more stable, meanwhile, the noise during cutting is greatly reduced, and multiple purposes are achieved.

Drawings

FIG. 1 is a schematic structural view of a cutting mechanism assembled in a pencil sharpener according to an embodiment of the present invention;

Fig. 2 is a schematic view of the overall structure of the cutting mechanism in the embodiment of the present invention;

FIG. 3 is an exploded view of the cutting mechanism of the embodiment of the present invention;

FIG. 4 is a schematic view of an exploded structure of a gear seat and a tool holder of a cutting mechanism according to an embodiment of the present invention;

Fig. 5 is a sectional view of the overall structure of the cutting mechanism according to the embodiment of the present invention;

Fig. 6 is an angle diagram of the included angle α between the hob and the rotating shaft of the hob holder and the helix angle β of the cutting edge with respect to the central axis of the hob according to the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 to 6, in the present embodiment, the cutting mechanism of the pencil sharpener of the present invention includes a gear seat 1, a knife rest 2 and a hob 3, wherein the knife rest 2 is disposed on the gear seat 1 and can rotate relative to the gear seat 1, and the hob 3 is disposed on the knife rest 2 and can rotate relative to the knife rest 2 under the action of the gear seat 1, specifically, a plurality of cutting edges 31 are disposed on the outer peripheral wall of the hob 3, the cutting edges 31 are spirally wound from top to bottom and are arranged at intervals along the circumferential direction of the hob 3, correspondingly, a plurality of teeth 11 matched with the cutting edges 31 are disposed at intervals on the inner peripheral wall of the gear seat 1, and the hob 3 is rotatably matched with the gear seat 1 through the engagement of the cutting edges 31 and the teeth 11.

In the prior art, the gear seat 1 is directly meshed with a transmission gear arranged at the end of the hob 3 to drive the hob 3 to rotate relative to the tool rest 2, and the conventional transmission gear is adopted, so that the tooth claw 11 on the gear seat 1 is matched with the transmission gear.

In the present embodiment, referring to fig. 6, the range of the included angle between the hob 3 and the rotation shaft 2b of the hob holder 2 is α, the range of the spiral angle of the cutting edge 31 relative to the central axis of the hob 3 is β, and the range of the inclination angle of the tooth claw 11 relative to the axis of the gear holder 1 is β - α, so that in the actual production process, the hob 3 can be generally divided into two types because of the difference in the cutting diameter, one type is the hob 3 with a cutting diameter of 13mm to 15mm, the range of the spiral angle β of the cutting edge 31 relative to the central axis of the hob 3 is 35 ° to 40 °, and the range of the included angle α between the hob 3 and the tool holder 2 is 10 ° to 15 °, so that the range of the inclination angle β - α of the tooth claw 11 relative to the axis of the gear holder 1 is 20 ° to;

The other is a hob 3 with the diameter of 7 mm-10 mm, the spiral angle beta of the cutting edge 31 of the hob 3 relative to the central axis of the hob 3 ranges from 28 degrees to 34 degrees, the installation included angle alpha of the hob 3 and the hob holder 2 ranges from 10 degrees to 15 degrees, and the inclination angle beta of the tooth claw 11 relative to the axis of the gear seat 1 ranges from 13 degrees to 24 degrees. As described above, most preferably, the hob 3 with a diameter of 13mm to 15mm has the teeth 11 inclined at an angle of 25 ° with respect to the axis of the gear holder 1; the hob 3 with the diameter of 7 mm-10 mm has the tooth claw 11 inclined at an angle of 18 degrees relative to the axis of the gear seat 1. It is worth noting that: the above-mentioned angle β - α is the difference between the helix angle β of the cutting edge 31 with respect to the central axis of the hob 3 and the installation angle α of the hob 3 with respect to the rotation axis 2b of the hob holder 2.

In this embodiment, in order to facilitate the rotation of the hob 3 relative to the tool rest 2, a first protrusion 32 and a second protrusion 33 are protruded from two ends of the hob 3, a through hole 21 for the first protrusion 32 to pass through is opened on one end of the tool rest 2 adjacent to the gear seat 1, a groove 22 for the second protrusion 33 to be accommodated therein is opened on the other end of the tool rest 2, two ends of the hob 3 are respectively rotatably connected to the tool rest 2 through the cooperation of the first protrusion 32 and the through hole 21 and the cooperation of the second protrusion 33 and the groove 22, and a stopper 4 for limiting the second protrusion 33 to separate from the groove 22 is further disposed on the tool rest 2. In this embodiment, the position-limiting member 4 is a position-limiting ring having an opening 1a, the position-limiting ring is sleeved on the tool holder 2, and a first end of the position-limiting ring can cover or partially cover the groove 22. Simultaneously, in order to facilitate the rotation of the driving tool rest 2 relative to the gear seat 1, one end of the tool rest 2 far away from the gear seat 1 is provided with a connecting seat 23 for connecting the driving mechanism 100, the connecting seat 23 is provided with a slot 231 for inserting the output shaft of the driving mechanism 100, the inner peripheral wall of the slot 231 is provided with a plurality of limiting convex ribs 232 which are arranged along the circumferential direction at intervals and can limit the rotation of the tool rest 2 relative to the output shaft of the driving mechanism 100, and the limiting convex ribs 232 are formed by extending inwards along the radial direction of the slot 231.

In this embodiment, in order to facilitate the contact between the hob 3 and the pencil 300 to be cut, a cutting groove 2a for the pencil 300 to be cut to be inserted is axially formed in the tool holder 2, an opening 1a for the pencil to be inserted into the cutting groove 2a is formed in the gear holder 1, the opening 1a is communicated with the cutting groove 2a, the hob 3 is obliquely arranged from one end of the tool holder 2 adjacent to the gear holder 1 to one end far away from the gear holder 1, and in a state where the hob 3 is assembled on the tool holder 2, the end of the hob 3 far away from the gear holder 1 can be partially accommodated in the cutting groove 2 a.

A pencil sharpener with a cutting mechanism comprises a driving mechanism 100 and a transmission piece 200, wherein a power output end of the driving mechanism 100 is connected with one end of the transmission piece 200, the other end of the transmission piece 200 is connected with a tool rest 2 and can drive the tool rest 2 to rotate relative to a gear seat 1, and it is worth noting that the driving mechanism 100 can be a manual rocker arm or an electric driver as long as the driving tool rest 2 can rotate relative to the gear seat 1.

When the pencil sharpener is used, a pencil 300 to be cut is inserted into the cutting groove 2a, the driving mechanism 100 provides power, the tool rest 2 can rotate in the forward direction relative to the gear seat 1, the hob 3 is assembled on the tool rest 2, and the cutting edge 31 of the hob 3 is directly meshed with the claw 11 on the inner peripheral wall of the gear seat 1, so that the hob 3 can be driven to rotate in the reverse direction relative to the tool rest 2 while the tool rest 2 rotates, and because the hob 3 is obliquely arranged from one end of the tool rest 2 adjacent to the gear seat 1 to one end far away from the gear seat 1, in a state that the hob 3 is assembled on the tool rest 2, the end of the hob 3 far away from the gear seat 1 can be partially accommodated in the cutting groove 2a, so that the rotation of the hob 3 can directly enable the cutting edge 31 to be in contact with the cutting surface of the pencil.

Claims

1. The utility model provides a cutting mechanism of penknife, includes gear receptacle (1), knife rest (2) and hobbing cutter (3) that are used for cutting pencil (300), knife rest (2) set up on gear receptacle (1) and can rotate gear receptacle (1) relatively, hobbing cutter (3) set up on knife rest (2), be provided with a plurality of cutting edges (31) on the periphery wall of hobbing cutter (3), each cutting edge (31) top-down spiral coils and arranges its characterized in that along the circumference interval of hobbing cutter (3): the internal perisporium of pinion stand (1) is gone up the interval and is provided with a plurality ofly and cutting edge (31) assorted latch (11), hobbing cutter (3) through the meshing of cutting edge (31) and latch (11) and with pinion stand (1) normal running fit.

2. the cutting mechanism of claim 1, wherein: the range of the spiral angle (beta) of each cutting edge (31) relative to the central axis of the hob (3) is 35-40 degrees, the range of the installation included angle (alpha) of the hob (3) relative to the rotating shaft (2b) of the tool rest (2) is 10-15 degrees, the range of the inclination angle (beta-alpha) of the tooth claw (11) relative to the axis of the gear seat (1) is 20-30 degrees,

or the spiral angle (beta) of each cutting edge (31) relative to the central axis of the hob (3) ranges from 28 degrees to 34 degrees, the installation included angle (alpha) of the hob (3) relative to the rotating shaft (2b) of the tool rest (2) ranges from 10 degrees to 15 degrees, and the inclination angle (beta-alpha) of the tooth claw (11) relative to the axis of the gear seat (1) ranges from 13 degrees to 24 degrees.

3. The cutting mechanism of claim 2, wherein: the inclination angle of the tooth claw (11) relative to the axis of the gear seat (1) is 25 degrees or 18 degrees.

4. The cutting mechanism of any one of claims 1 to 3, wherein: the protruding first convex part (32) and the second convex part (33) that are equipped with in both ends of hobbing cutter (3), one of cutter frame (2) neighbouring gear seat (1) is served and is offered through-hole (21) that supply first convex part (32) to pass, offer recess (22) that supply second convex part (33) holding wherein on cutter frame (2) the other end, the both ends of hobbing cutter (3) are connected with the cooperation of through-hole (21), second convex part (33) and recess (22) and rotate through the cooperation of first convex part (32) and through-hole (32) respectively on cutter frame (2).

5. the cutting mechanism of claim 4, wherein: the tool rest (2) is further provided with a limiting piece (4) for limiting the second convex part (33) to be separated from the groove (22).

6. The cutting mechanism of claim 5, wherein: the limiting piece (4) is a limiting ring with an opening (1a), the limiting ring is sleeved on the tool rest (2), and the first end of the limiting ring can cover or partially cover the groove (22).

7. The cutting mechanism of claim 1, wherein: a cutting groove (2a) for inserting a pencil (300) to be cut is axially formed in the tool rest (2), an opening (1a) for inserting the pencil into the cutting groove (2a) is formed in the gear seat (1), and the opening (1a) is communicated with the cutting groove (2 a); the hob (3) is obliquely arranged from one end, close to the gear seat (1), of the hob holder (2) to one end, far away from the gear seat (1), and under the condition that the hob (3) is assembled on the hob holder (2), the end, far away from the gear seat (1), of the hob (3) can be partially accommodated in the cutting groove (2 a).

8. the cutting mechanism of claim 1, wherein: one end of the tool rest (2) far away from the gear seat (1) is provided with a connecting seat (23) connected with the driving mechanism (100), and the connecting seat (23) is provided with a slot (231) for inserting an output shaft of the driving mechanism (100).

9. The cutting mechanism of claim 8, wherein: the inner peripheral wall of the slot (231) is provided with a plurality of limiting convex ribs (232) which are arranged at intervals along the circumferential direction and can limit the tool rest (2) to rotate relative to the output shaft of the driving mechanism (100), and the limiting convex ribs (232) are formed by extending inwards along the radial direction of the slot (231).

10. a pencil sharpener having a cutting mechanism as claimed in any one of claims 1 to 9, characterized by: the gear transmission mechanism comprises a driving mechanism (100) and a transmission piece (200), wherein the power output end of the driving mechanism (100) is connected with one end of the transmission piece (200), and the other end of the transmission piece (200) is connected with a tool rest (2) and can drive the tool rest (2) to rotate relative to a gear seat (1).