Pencil sharpener feeding device

Abstract

The present invention relates to a pencil feeding device for a pencil sharpener, which comprises a base, a positioning frame and a rotating shaft. One side of the base is provided with a transmission disc and a rotating disc. The transmission disc can be driven by the rotary cutting device of the pencil sharpener to rotate and drive the rotating disc. The surface of the rotating disc has several friction lines. The positioning frame is movably pivoted with several positioning shafts, and the rotating shaft is arranged on the positioning shafts. Each rotating shaft is provided with a pencil clamping roller and a friction wheel. The pencil clamping roller is used for clamping and feeding a pencil forward, and the friction wheel can be driven by the friction driving energy of the rotating disc. By the rotation of the friction wheel and the positioning shaft, the pencil clamping roller forms an adjustable clamping opening, which can automatically adjust the size of the clamping opening for pencils with different diameters and different outer shapes to apply a pencil clamping effect, ensure that the central position of the pencil is maintained on the rotary cutting center line of the pencil sharpener, and can smoothly and automatically feed the pencil during cutting, and can easily withdraw the pencil after cutting is completed.

Description

Technical Field:

[0001] The present invention belongs to the field of stationery, and particularly relates to a pencil feeding device for a pencil sharpener, which is particularly suitable for automatically adjusting the clamping size of the clamping mouth for pencils with different surface shapes and diameters and applying a clamping action, and can smoothly and automatically feed the pencil during cutting, and can easily withdraw the pencil after cutting. Background Art:

[0002] For traditional pencil sharpeners, the pencil clamping and feeding device for clamping the pencil rod and feeding it into the rotary cutting device is arranged on the front outer side of the pencil sharpener housing, and is positioned on the housing by a pair of guide rods that can elastically expand and contract and protrude parallel to each other inside the housing. During pencil sharpening, it is necessary to first pull the clamping plate of the feeding device forward along a pair of guide rods against the elastic force of the restoring spring at the inner end of the guide rods. Secondly, press the operating handle of the clamping plate to open the clamping mouth of the clamping plate, insert the pencil until its front end enters the tapered hole of the chip removal device, release the external force of the operating handle, the clamping plate will shrink the clamping mouth to clamp the pencil rod, and the elastic restoring force of the spring of the guide rod will give the pencil rod the force to feed into the rotary cutting device. Subsequently, as the rotary cutting device is rotated by the hand crank for pencil sharpening, the pencil rod gradually advances forward until the cutting operation of the pencil tip is completed. After pencil sharpening, when removing the pencil, it is necessary to first press the operating handle to open the clamping mouth of the clamping plate before the pencil can be taken out.

[0003] This kind of pencil feeding device is rather cumbersome to operate, and often requires pulling again because the guide rod is not pulled out long enough, or the operating handle is released too early, resulting in the clamping plate strongly hitting the pencil sharpener housing, making a sharp impact sound. If not careful, there may even be an accident of pinching the finger. At the same time, the tooth-shaped clamping surfaces of the three clamping blocks of the clamping plate are likely to bite the surface of the pencil rod, causing the paint surface or printing to fall off or leaving tooth marks.

[0004] In view of this, the applicant has made appropriate improvements to the traditional pencil sharpener and recorded them in patent publication documents, such as the automatic pencil feeding device for a pencil sharpener with Chinese Patent Application No. 201020647480.8, and the self-discharging pencil feeding device for a pencil sharpener with Patent Application No. 201320265052.2. The automatic pencil feeding and discharging device for the pencil sharpener disclosed is such.

[0005] Among them, the patent application number is 201020647480.8, which discloses an automatic pen feeding device for a pencil sharpener, including a bracket and a turntable, two pairs of clamping wheel bearing seats of the bracket are respectively positioned with rotating shafts, and the rotating shafts are sequentially sleeved with pen clamping wheels and friction wheels, and the two friction wheels are located at the far ends of the two rotating shafts; the turntable is installed in the center of the two pairs of clamping wheel bearing seats, and the bracket and the turntable are provided with through holes for the pen holder to pass through, wherein a transmission disc is placed in the sunken shaft seat of the bracket facing the turntable side, and the center of the transmission disc is provided with a connecting hole for the end of the hollow pen holder guide cone hole of the hob seat to be inserted, and more than two grooves are provided on the circumference of the end face of the transmission disc, and the groove has an inclined bottom; the end face of the turntable adjacent to the transmission disc is convexly provided with a corresponding fork, and the fork is inserted into the groove to form a linkage. The rotational power is transmitted by means of the transmission disc, and the inclined bottom on the groove has different forces against the turntable when rotating forward and reverse, so that the friction between the turntable and the friction wheel is different, resulting in two different hand feelings of tighter when feeding the pen and looser when retracting the pen.

[0006] The announcement number is 201320265052.2, which discloses a self-discharging pen feeding device for a pencil sharpener, including a clamping wheel seat and a turntable fixed in the pencil sharpener housing, the clamping wheel seat has two pairs of clamping wheel bearings extending toward the same side, and the two pairs of clamping wheel bearings are respectively positioned with two rotating shafts with rubber clamping wheels; the turntable is installed in the center of the two pairs of clamping wheel bearings and is arranged between the rubber clamping wheels and the clamping wheel seat, and a connecting through hole is provided in the center of the turntable for inserting the end of the hollow pen guide cone hole of the hob cutter seat, and the turntable is driven to rotate by the hob cutter seat; the connecting through hole, the pen guide cone hole and the pen feeding hole of the pencil sharpener housing are on the same axis, and the feature is that at least one bearing hole in each pair of clamping wheel bearings is a transverse long hole. With the transverse long groove design of a clamping wheel bearing hole, the distance between the two rubber clamping wheels can be automatically adjusted, and pens of different calibers can be clamped for pencil sharpening.

[0007] However, although the pen-feeding devices of the above two pencil sharpeners can feed pencils of different calibers for pencil sharpening, the pen-feeding devices can only hold two sides of the pencil in a relative manner. When holding a pencil with a triangular appearance, because the triangle has three corners and the pen-feeding device accommodates the clamping force point and the balance function, it can only hold one corner of one side of the pencil and one side of the other side of the pencil at most, so that the center position of the triangular pencil deviates from the rolling center line of the pencil sharpener. In this way, the cutting surface of the circumference of the triangular pencil after cutting is definitely uneven, that is, the cutting surface of one side of the pencil is larger and the cutting surface of the other side is smaller. In addition to poor aesthetics, it also causes incorrect pen-holding posture, incorrect pen-holding ergonomics, and uncomfortable pen-holding feeling.

[0008] Therefore, if the triangular pencil can be clamped and its center position can be maintained on the rolling center line of the pencil sharpener, the cutting surface of the circumference of the triangular pencil after cutting can be quite uniform.

[0009] How to improve these pencil sharpeners to make their functions more perfect and ideal has become the focus of research and development of the present inventor. Summary of the Invention:

[0010] The object of the present invention is to provide a pencil feeding device for a pencil sharpener, which can automatically adjust the clamping size of pencils with different diameters and different outer shapes to apply a pencil clamping effect, ensure that the central position of the pencil is maintained on the center line of the rotary cutting of the pencil sharpener, and can smoothly and smoothly automatically feed and retract the pencil during the cutting process.

[0011] The technical solution of the present invention is realized as follows: A pencil feeding device for a pencil sharpener, comprising:

[0012] A support seat is provided on the housing of the pencil inlet of the pencil sharpener. One side of the support seat has a transmission disk and a turntable. The transmission disk can be driven by the rotary cutting device of the pencil sharpener to rotate and drive the turntable. The transmission disk and the turntable respectively have connection holes and through holes for the pencil to pass through and communicate with the inlet. The surface of the turntable has several friction lines;

[0013] A positioning frame is combined with the support seat. The positioning frame is movably pivotally connected with several positioning shafts facing the turntable;

[0014] A rotating shaft is provided on the positioning shaft. Each rotating shaft has a pencil clamping roller and a friction wheel. The pencil clamping roller is in a state of surrounding the through hole of the turntable and is used to roll towards the through hole to clamp and push the pencil. The friction wheel can be driven by the friction driving energy of the turntable, so as to drive the positioning shaft, the rotating shaft and the pencil clamping roller to rotate.

[0015] The circumferential of the transmission disk has several tooth grooves. Several convex pins corresponding to the tooth grooves are provided on one side of the turntable. The convex pins are respectively inserted into the corresponding tooth grooves. When the transmission disk is driven by the rotary cutting device of the pencil sharpener to rotate, the turntable is driven to rotate by the locking action between the tooth grooves and the convex pins.

[0016] When the convex pin of the transmission disk is located at the inclined part of the tooth groove, in addition to moving towards the friction wheel, the turntable also pushes the transmission disk at the same time; several elastic pieces are provided on one side of the transmission disk. The elastic pieces are pressed against the surface of the support seat. When the transmission disk is pushed by the turntable, the elastic pieces are compressed to generate an elastic force, which can elastically push the turntable to closely contact the friction wheel.

[0017] The friction lines are radial.

[0018] The positioning frame has several pivot holes, and the positioning shaft can be elastically hooked and clamped in the pivot holes, so that the positioning shaft can rotate on the positioning frame without falling off.

[0019] The positioning frame has several engaging portions, which can be correspondingly clamped and engaged with the engaging holes provided on the support by means of elastic hooks.

[0020] The positioning shaft is provided with a positioning plate, which has a truncated side surface. A bearing seat for setting the rotating shaft is provided on one side of the positioning plate, and the positioning frame has a flange. When the positioning shaft rotates inward by a certain angle, the truncated side surface of the positioning plate is blocked by the flange to achieve angular positioning.

[0021] The positioning frame has several L-shaped protruding limiting plates, which are used to block excessive axial movement of the friction wheel on the rotating shaft. When the positioning shaft rotates outward by a certain angle, the surface of the friction wheel is blocked by the limiting plate to achieve angular positioning.

[0022] The friction wheel is arranged on a sleeve body, and the sleeve body is further arranged on the rotating shaft. A matching structure of a convex key and a key groove can be provided between the sleeve body and the rotating shaft. Through the engagement of the convex key and the key groove, the sleeve body can drive the rotating shaft to rotate and can also move axially along the rotating shaft. The rotating shaft is provided with a stop body, which is used to block excessive axial movement of the sleeve body and the friction wheel on the rotating shaft.

[0023] Three pivot holes and three limiting plates are provided on the positioning frame, and they are located at the three equal parts of the concentric circumference; each pivot hole is used to movably position a positioning shaft, and each positioning shaft is used to movably position a rotating shaft. The friction wheel can contact the corresponding limiting plate when rotating following the rotating shaft.

[0024] The present invention has the characteristics of ingenious concept, reasonable design, simple operation and wide adaptability; it can not only meet the cutting of pen rods with different diameters, but also be compatible with the cutting of pen rods with different outer appearances such as hexagonal and triangular shapes. Moreover, it can automatically adjust the size of the clamping mouth and apply a clamping force, and ensure that the center position of the pencil is maintained on the center line of the rotary cutting of the pencil sharpener, that is, ensure the cutting with the pen core centered, as well as the automatic forward and backward function during the cutting process. Brief Description of the Drawings:

[0025] The present invention will be further described below with specific illustrations:

[0026] Figure 1 Side view of the combination of the present invention and the rotary cutting device

[0027] Figure 2 Exploded perspective view of the present invention

[0028] Figure 3 Perspective view of the positioning frame and the rotating shaft of the present invention

[0029] Figure 4 Perspective view of the positioning frame of the present invention with the rotating shaft removed

[0030] Figure 5Cross-sectional view of the pen-holding use embodiment of the present invention

[0031] Figure 6 Upper view of the pen-feeding use embodiment of the present invention

[0032] Figure 7A 、 Figure 7B 、 Figure 7C Schematic diagram of the continuous actions of the present invention for a triangular pen-barrel pencil before pen-holding, during pen-holding, and during pen-feeding

[0033] Figure 8A 、 Figure 8B 、 Figure 8C Schematic diagram of the continuous actions of the present invention for a round pen-barrel pencil before pen-holding, during pen-holding, and during pen-feeding

[0034] Wherein

[0035] 1 - Pen-feeding device 10 - Support 11 - Coupling hole

[0036] 20 - Positioning frame 21 - Positioning shaft 211 - Positioning plate 212 - Bearing seat

[0037] 22 - Pivoting hole 23 - Coupling part 24 - Flange 25 - Limiting plate

[0038] 30 - Rotating shaft 31 - Pen-holding roller 32 - Friction wheel 33 - Sleeve

[0039] 34 - Stopping body

[0040] 40 - Transmission disk 41 - Connecting hole 42 - Tooth groove 43 - Elastic piece

[0041] 50 - Turntable 51 - Through hole 52 - Friction pattern 53 - Convex pin

[0042] 80 - Pencil 91 - Hobbing device 92 - Crank 93 - Hollow rotating shaft Detailed implementation method:

[0043] Referring to Figures 1 to 5 , the pen-feeding device 1 of the pencil sharpener of the present invention includes a support 10, a positioning frame 20, and a rotating shaft 30.

[0044] It will be described in detail below:

[0045] The support 10 is provided on the housing of the pen-feeding port of the pencil sharpener (the housing is conventional and thus not shown). One side of the support 10 has a transmission disk 40 and a turntable 50. The transmission disk 40 can be driven by the hobbing device 91 of the pencil sharpener to rotate and drive the turntable 50. The transmission disk 40 and the turntable 50 respectively have connecting holes 41 and through holes 51 through which the pencil can pass and communicate with the pen-feeding port. The surface of the turntable 50 has several friction patterns 52.

[0046] The positioning frame 20 is coupled to the support 10, and a plurality of positioning shafts 21 facing the turntable 50 are pivotally connected to the positioning frame 20.

[0047] The rotating shaft 30 is disposed on the positioning shaft 21, that is, a rotating shaft 30 is correspondingly provided on each positioning shaft 21; each rotating shaft 30 has a pen clamping roller 31 and a friction wheel 32. The pen clamping roller 31 is in a state surrounding the through hole 51 of the turntable 50, and is used to roll towards the through hole 51 to clamp and push the pencil. The friction wheel 32 can be driven by the friction driving energy of the turntable 50, so as to drive the positioning shaft 21, the rotating shaft 30, and the pen clamping roller 31 to rotate.

[0048] Furthermore, the transmission disk 40 has a plurality of tooth grooves 42 around its circumference, and a plurality of protruding pins 53 corresponding to the plurality of tooth grooves 42 are provided on one side of the turntable 50. The protruding pins 53 are respectively inserted into the corresponding tooth grooves 42. When the transmission disk 40 is driven by the rolling device 91 of the pencil sharpener to rotate, the turntable 50 is driven to rotate by the locking action between the tooth grooves 42 and the protruding pins 53.

[0049] Furthermore, when the protruding pin 53 of the transmission disk 40 is located at the inclined part of the tooth groove 42 during rotation, in addition to moving towards the friction wheel 32, the turntable 50 also presses the transmission disk 40 at the same time; a plurality of elastic pieces 43 are provided on one side of the transmission disk 40, and the elastic pieces 43 are pressed against the surface of the support 10. When the transmission disk 40 is pressed by the turntable 50, the elastic pieces 43 are compressed to generate an elastic force, which can elastically push the turntable 50 to closely contact the friction wheel 32.

[0050] Furthermore, the friction lines 52 are radial.

[0051] Furthermore, the positioning frame 20 has a plurality of pivot holes 22, and the positioning shaft 21 can be elastically hooked and clamped in the pivot holes 22, so that the positioning shaft 21 can rotate on the positioning frame 20 without falling off.

[0052] Furthermore, the positioning frame 20 has a plurality of coupling parts 23, and the coupling parts 23 can be correspondingly clamped and coupled to the coupling holes 11 provided on the support 10 by elastic hooks.

[0053] Furthermore, the positioning shaft 21 is provided with a positioning plate 211, the positioning plate 211 has a truncated side surface, a bearing seat 212 for setting the rotating shaft 30 is provided on one side of the positioning plate 211, and the positioning frame 20 has a flange 24. When the positioning shaft 21 rotates inward by a certain angle, the truncated side surface of the positioning plate 211 is blocked by the flange 24 to achieve angle positioning, so as to prevent the rotating shaft 30 from rotating inward by too large an angle (i.e., when the pencil enters).

[0054] Furthermore, the positioning bracket 20 has several L-shaped protruding limiting plates 25 for stopping excessive axial movement of the friction wheel 32 on the rotating shaft 30. When the positioning shaft 21 rotates outward relative to a certain angle, the surface of the friction wheel 32 is stopped by the limiting plate 25 to achieve angular positioning, preventing the rotating shaft 30 from rotating outward by too large an angle (i.e., when retracting the pen).

[0055] Furthermore, the friction wheel 32 is arranged on a sleeve 33, and the sleeve 33 is further arranged on the rotating shaft 30. A fitting structure of a convex key and a key groove can be provided between the sleeve 33 and the rotating shaft 30. Through the engagement of the convex key and the key groove, the sleeve 33 can drive the rotating shaft 30 to rotate and can also move axially along the rotating shaft 30. The rotating shaft 30 is provided with a stopper 34 for stopping excessive axial movement of the sleeve 33 and the friction wheel 32 on the rotating shaft 30.

[0056] In summary, it is preferable to provide three pivot holes 22 and three limiting plates 25 on the positioning bracket 20, and they are located at the trisecting positions of the same concentric circle; a positioning shaft 21 is movably positioned in each pivot hole 22, a rotating shaft 30 is movably positioned on each positioning shaft 21, and the friction wheel 32 can contact the corresponding limiting plate 25 when rotating with the rotating shaft to meet the clamping requirements of triangular, hexagonal, and round pen holders.

[0057] The above is an introduction to the components of the present invention and their composition methods. Next, the usage examples, features, and benefits of the present invention will be introduced as follows:

[0058] Please refer to Figure 1 、 Figure 6 、 Figure 7A 、 Figure 7B 、 Figure 7C , the usage example of the present invention for clamping and feeding a triangular pen holder pencil 80:

[0059] After the pencil 80 is inserted into the through hole 51 of the turntable 50 through the positioning bracket 20, when the crank 92 is shaken to rotate the turning device 91, the transmission disc 40 is driven by the hollow rotating shaft 93, and the turntable 50 is driven to rotate by the locking action between the tooth groove 42 and the convex pin 53. The turntable 50 will cause the friction wheel 32 to rotate, and at the same time, the rotating shaft 30 and the pen clamping roller 31 will rotate inward correspondingly. Because a thrust is generated in the axial direction of the rotating shaft 30 when the friction wheel 32 rotates, the positioning shaft 21 rotates, driving the rotating shaft 30 and the pen clamping roller 31 to move inward correspondingly to form an adjustable clamping opening, thereby applying an automatic pen clamping action to the pencil 80. The pen clamping roller 31 can also be automatically adjusted to ensure that the center position of the pencil 80 is maintained on the turning center line of the pencil sharpener, making the circumferential cutting surface after cutting the pencil 80 average and beautiful, enabling the user to hold the pen correctly, conforming to the pen-holding ergonomics, and providing a comfortable pen-holding feeling.

[0060] When the pencil-holding roller 31 applies the automatic pencil-holding function to the pencil 80 and continues to rotate inward correspondingly, the pencil 80 can be clamped and pushed deeper into the cutting tapered hole of the turning device 91 to form a smooth and unobstructed pen-feed action for cutting.

[0061] When the cutting of the pencil 80 is completed, the crank 92 is shaken in the reverse direction, and the transmission disk 40 drives the turntable 50 to rotate in the reverse direction. These friction wheels 32 and the pencil-holding roller 31 rotate outward in the reverse direction correspondingly. At the same time, the positioning shaft 21 rotates in the reverse direction, causing the rotating shaft 30 and the pencil-holding roller 31 to move outward correspondingly, and no longer applying the pencil-holding and pen-feed functions to the pencil 80. The pencil 80 can then be easily and smoothly withdrawn.

[0062] Please refer to Figure 8A , Figure 8B , Figure 8C , for the usage example of the present invention for clamping and feeding a round-barrel pencil 80, its operating principle, usage method, and functions are the same as those of the triangular-barrel pencil 80, and will not be elaborated here.

[0063] In summary, by the rotation of the friction wheel and the positioning shaft, the pencil-holding roller forms an adjustable clamping opening, which can automatically adjust the clamping opening size for pencils with different diameters and different outer shapes (such as triangular, hexagonal, round, etc.) to apply the pencil-holding function, and ensure that the central position of the pencil is maintained on the turning center line of the pencil sharpener, making the cutting surface of the pencil after cutting even and beautiful, and enabling the pencil to be smoothly and unobstructedly fed automatically during cutting, and the pencil can be easily withdrawn after cutting.

[0064] The above are the embodiments cited in this case, which are only for convenience of description and should not limit the meaning of this case. That is, all various transformation designs made according to the listed patent application scope should be included in the patent scope of this case.

Claims

1. A pencil feeding device for a pencil sharpener, comprising: A base provided on the housing of the pencil inlet of the pencil sharpener. One side of the base has a driving disc and a turntable. The driving disc can be driven by the rotary cutting device of the pencil sharpener to rotate and drive the turntable. The driving disc and the turntable respectively have connecting holes and through holes for the pencil to pass through and communicate with the pencil inlet. The surface of the turntable has several friction lines, and the friction lines are radial; A positioning frame is combined with the base. The positioning frame is pivotally connected with several positioning shafts facing the turntable; A rotating shaft is provided on the positioning shaft. Each rotating shaft has a pencil clamping roller and a friction wheel. The pencil clamping roller surrounds the through hole of the turntable and is used to roll towards the through hole to clamp and push the pencil. The friction wheel can be driven by the friction driving energy of the turntable, so that the positioning shaft, the rotating shaft and the pencil clamping roller rotate; The circumferential periphery of the driving disc has several tooth grooves. Several protruding pins corresponding to the tooth grooves are provided on one side of the turntable. The protruding pins are respectively inserted into the corresponding tooth grooves. When the driving disc is driven by the rotary cutting device of the pencil sharpener to rotate, the turntable is driven to rotate by the locking action between the tooth grooves and the protruding pins; It is characterized in that: When the driving disc rotates so that the protruding pin is located at the inclined part of the tooth groove, in addition to moving towards the friction wheel, the turntable also pushes the driving disc at the same time. Several elastic pieces are provided on one side of the driving disc. The elastic pieces are pressed against the surface of the base. When the driving disc is pushed by the turntable, the elastic pieces are compressed to generate elastic force, and the turntable can be elastically pushed to closely contact the friction wheel; The positioning frame has several pivot holes, and the positioning shaft can be inserted and locked in the pivot holes by elastic hooks, so that the positioning shaft can rotate on the positioning frame without falling off; The positioning shaft is provided with a positioning plate. The positioning plate has a truncated side surface. A bearing seat for setting the rotating shaft is provided on one side of the positioning plate. The positioning frame has a flange. When the positioning shaft rotates inward by a certain angle, the truncated side surface of the positioning plate is blocked by the flange to achieve angle positioning; The positioning frame has several L-shaped protruding limiting plates to stop excessive axial movement of the friction wheel on the rotating shaft. When the positioning shaft rotates outward by a certain angle, the surface of the friction wheel is blocked by the limiting plate to achieve angle positioning.

2. The pencil feeding device for a pencil sharpener according to claim 1, It is characterized in that: The positioning frame has several engaging parts, and the engaging parts can be correspondingly locked and engaged with the engaging holes provided on the base by elastic hooks.

3. The pencil feeding device for a pencil sharpener according to claim 1, It is characterized in that: The friction wheel is arranged on a sleeve body, and the sleeve body is arranged on the rotating shaft. A matching structure of a convex key and a key groove can be provided between the sleeve body and the rotating shaft. Through the engagement of the convex key and the key groove, the sleeve body can drive the rotating shaft to rotate and can also move axially along the rotating shaft. The rotating shaft is provided with a stop body to stop excessive axial movement of the sleeve body and the friction wheel on the rotating shaft.

4. The pencil feeding device for a pencil sharpener according to claim 1 or 2, It is characterized in that: There are three pivot holes and three limiting plates provided on the positioning frame, and they are at the three equal parts of the concentric circumference; a positioning shaft is movably positioned in each of the pivot holes, a rotating shaft is movably positioned on each positioning shaft, and the friction wheel can rotate along with the rotating shaft and abut against the corresponding limiting plate.

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