Pencil feeding and discharging mechanism of pencil sharpener

Abstract

The utility model provides a pencil advancing and retreating mechanism of a pencil sharpener, which is used for feeding or discharging a pencil to be sharpened into or out of the pencil sharpener and comprises a synchronizing component, a driving component and a driving component, the pen feeding and discharging mechanism is of a two-wheel structure, namely, the pen feeding and discharging mechanism comprises the two clamping assemblies arranged in parallel, the driving assembly is arranged below the clamping assemblies, and the two clamping assemblies can rotate under driving of the driving assembly. The two clamping assemblies can be driven by the synchronous assembly to synchronously and horizontally move towards each other or away from each other, and when the two clamping assemblies synchronously move, the displacement in the horizontal direction is the same.

Description

Technical Field

[0001] The utility model relates to the field of stationery and file parts, in particular to a pencil sharpener advance and retract mechanism. Background Art

[0002] As a pencil sharpening tool, pencil sharpeners are deeply loved by students. The use of pencil sharpeners makes pencil sharpening convenient and safe. The pencil sharpener includes a pen advance and retract mechanism and a cutting mechanism. When sharpening a pencil, the pencil is passed through the pen advance and retract mechanism and entered into the sharpening mechanism. After the pencil is in place, it is clamped by the pen advance and retract mechanism, and then the sharpening mechanism cuts the pen tip with cutting. After the pencil is sharpened, the pen advance and retract mechanism can also withdraw the pencil from the pencil sharpener. Among the pen advance and retract mechanisms of this type of pencil sharpener, the two-wheel pen advance and retract mechanism is the most common and popular due to its high cost performance. The common two-wheel pen advance and retract mechanism operates as follows: while the two rollers realize the pen advance and retract function, they can also change the distance between the two wheels according to pencils of different diameters to provide a stable clamping force for the pencil, so that the pencil can overcome the cutting force and not rotate when cutting, so as to complete the cutting of the pencil.

[0003] Existing two-wheel pen-advancing and retracting mechanisms, such as those provided in CN217373990U and CN106004188B, independently apply lateral forces to the rollers on both sides to provide the rollers with a clamping force on the pencil. This structure does not have an automatic centering linkage structure. If the forces applied to the two rollers are different, or the pencil is subjected to lateral forces during the insertion process, it is easy to cause the pen entry hole formed between the two rollers to deviate from the center position of the pen entry hole of the tool holder, thereby easily causing the pencil to be offset or broken when cutting.

[0004] There is an urgent need for a two-wheel advance and retract pen structure with high cost performance and automatic adjustable aperture. The advance and retract pen mechanism will not deviate due to the displacement of the rollers on both sides, so as to solve the technical problems of poor automatic centering, easy core deviation and core breakage, and high cost of the current two-roller advance and retract pen mechanism. Utility Model Content

[0005] The utility model aims to provide a pencil sharpener advance and retreat mechanism, which has simple principle and structure, low cost, stability and reliability, and can realize automatic centering of pencils fed into the pencil sharpener, thereby preventing pencil core deviation and pencil core breakage.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A pencil sharpener advance and retract mechanism is used for feeding a pencil to be cut into or out of the pencil sharpener. The advance and retract mechanism comprises: a synchronization component; a clamping component and a driving component. The advance and retract mechanism is a two-wheel structure, that is, the advance and retract mechanism comprises two clamping components arranged in parallel. The driving component is arranged below the clamping component. The two clamping components can rotate under the drive of the driving component. The two clamping components can synchronously move toward or away from each other horizontally under the drive of the synchronization component. When the two clamping components move synchronously, the displacement in the horizontal direction is the same.

[0008] Further, the synchronization component includes a mounting plate and a pair of sliders.

[0009] Furthermore, a pair of sliders are centrally symmetrically arranged.

[0010] Furthermore, the clamping assembly includes a clamping wheel shaft and a clamping wheel.

[0011] Furthermore, the clamping wheel sleeve is arranged on the clamping wheel axle.

[0012] Furthermore, the clamping wheel axle is rotatably inserted on the sliding block.

[0013] Furthermore, the slider can move horizontally along the mounting plate, and the slider can drive the clamping wheel axle to move horizontally synchronously.

[0014] Furthermore, the synchronization component also includes an elastic member and a swing member.

[0015] Furthermore, at least a portion of the slider abuts against the swinging member, and the swinging member can drive the slider to move horizontally.

[0016] Furthermore, the elastic member can provide a restoring force towards the swing member.

[0017] Furthermore, the elastic member is a U-shaped spring.

[0018] Furthermore, two ends of the U-shaped spring are respectively mounted on the outer side of the slider to provide restoring force.

[0019] Furthermore, the driving assembly includes a base, a turntable and a clutch.

[0020] Furthermore, the clutch, the turntable and the base are arranged in sequence from top to bottom.

[0021] Furthermore, the clutch wheel shaft of the clutch member is arranged in parallel with the clamping wheel shaft.

[0022] Furthermore, the base is fixedly arranged, the turntable is coaxially arranged with the base and can rotate around the axis, and the turntable can transfer power to the clutch, and then the clutch transfers the power to the clamping assembly.

[0023] Furthermore, the clamping wheel is made of soft rubber material.

[0024] Furthermore, the slider includes a protrusion.

[0025] Furthermore, the swinging member comprises a notch, and the protrusion can be inserted into the notch.

[0026] Furthermore, the clutch member is provided with a first transmission gear along the clutch wheel sleeve.

[0027] Furthermore, a second transmission gear is sleeved on the clamping wheel shaft.

[0028] Furthermore, at least a portion of the first transmission gear and the second transmission gear can mesh with each other to transmit power.

[0029] Furthermore, the clutch wheel sleeve is provided with a friction wheel, wherein:

[0030] When the sharpening speed is equal to the pen feeding speed, the friction wheel can rotate synchronously with the clutch wheel shaft;

[0031] When the sharpening speed is lower than the pen feeding speed, the friction wheel may slip with the clutch wheel shaft.

[0032] The utility model provides a pen-sharpening machine advance and retract mechanism, which has the following beneficial effects compared with the prior art:

[0033] The synchronous component drives the slider through the swinging part to drive the pen feed component. Compared with the conventional structure in which each pen feed component is driven separately by an elastic part, this structure adopts an equal-arm lever to drive the pen feed component through swinging, so as to ensure that the displacement of the pen feed component in the horizontal direction is consistent, realize automatic centering of the pen feed and retract mechanism, and prevent the deviation of the pencil during the pen feed and retract process and the breakage of the pencil lead.

[0034] The principle and structure of the structure are simple, the cost is low, the stability and reliability are strong, and the adaptability is strong. It effectively solves the problem that the advance and retreat pen mechanism cannot be automatically centered, the pencil is easily offset, resulting in broken cores and affecting the cutting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above technical content of the utility model and the following specific implementation methods will be better understood when read in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are only examples of the technical solutions claimed for protection. In the accompanying drawings, the same reference numerals represent the same or similar elements.

[0036] Figure 1 It is a schematic diagram of the exploded view of the pen advance and retract mechanism;

[0037] Figure 2 It is a schematic diagram of the assembly of the pen advance and retract mechanism;

[0038] Figure 3 It is a three-dimensional schematic diagram of the mounting plate;

[0039] Figure 4 It is a schematic diagram of the front view of the mounting plate;

[0040] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional view in the DD direction;

[0041] Figure 6 It is a three-dimensional schematic diagram of the slider;

[0042] Figure 7 It is a three-dimensional schematic diagram of the other direction of the slider;

[0043] Figure 8 It is a three-dimensional schematic diagram of the swinging member;

[0044] Fig. 9 It is a schematic diagram of the exploded view of the synchronization component;

[0045] Fig.10 It is a three-dimensional schematic diagram of the synchronization component;

[0046] Fig.11 is a schematic diagram of the front view of the synchronization component;

[0047] Fig.12 yes Fig.11 Schematic diagram of the cross-sectional view in the BB direction;

[0048] Fig.13 yes Fig.11 Schematic diagram of the cross-sectional view in the GG direction;

[0049] Fig.14 It is a three-dimensional schematic diagram of the pen advance and retreat assembly;

[0050] Fig.15 1. It is a schematic diagram of the front view of the pen advance and retract mechanism;

[0051] Fig.16 yes Fig.15 Schematic diagram of the cross-sectional view in the AA direction;

[0052] Fig.17 It is a three-dimensional schematic diagram of the pen feed assembly;

[0053] Fig.18 It is a three-dimensional schematic diagram of the clutch;

[0054] Fig.19 is a schematic diagram of a top view of the advance and retreat mechanism when no pencil is inserted;

[0055] Fig. 20 is a schematic diagram of a top view of the advance and retreat mechanism when a pencil is inserted;

[0056] Fig.21 is a schematic diagram of a turntable 320;

[0057] Fig. 22 It is a reverse stereoscopic diagram of the pen advance and retract mechanism.

[0058] The reference numerals are described as follows:

[0059] Synchronous components: 100

[0060] Slider: 110

[0061] Slider mounting holes: 111

[0062] Slider reset slot: 113

[0063] Bumps: 114

[0064] Guide: 115

[0065] Rotation limiter: 116

[0066] Mounting plate: 120

[0067] Long slot: 121

[0068] Flat panel mounting holes: 122

[0069] Plate mounting axis: 123

[0070] - Guide rails: 124

[0071] - Bezel: 125

[0072] Elastic parts: 130

[0073] Swinging parts: 140

[0074] Gaps: 141

[0075] Center hole: 142

[0076] Limiting table: 143

[0077] Clamping components: 200

[0078] Clamping axle: 210

[0079] Clamping roller: 220

[0080] Second transmission gear: 230

[0081] Drive assembly: 300

[0082] - Base: 310

[0083] Turntable: 320

[0084] Body: 321

[0085] Disc teeth: 322

[0086] Power input shaft: 323

[0087] Clutch: 330

[0088] Clutch shaft: 331

[0089] Friction wheel: 332

[0090] First transmission gear: 333

[0091] Power transmission gear: 334

[0092] The direction of movement of the slider when the pencil is inserted: S DETAILED DESCRIPTION

[0093] The detailed features and advantages of the present invention are described in detail in the specific implementation modes below, and the content is sufficient to enable any technical personnel in this field to understand the technical content of the present invention and implement it accordingly. According to the description, claims and drawings disclosed in this specification, the technical personnel in this field can easily understand the relevant purposes and advantages of the present invention.

[0094] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0095] In the description of this embodiment, it should be noted that the terms "upper" and "lower" and the like indicate positions or positional relationships defined by reference to the coordinates of the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation of the present invention. In the present invention, the end of the pen inlet in the normal upright state of the pencil sharpener is considered upper.

[0096] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0097] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0098] Figure 1 This is a schematic diagram of the exploded view of the pen advance and retract mechanism. Figure 2 This is an assembly diagram of the pen advance and retract mechanism, which includes: a synchronization component 100; a clamping component 200 and a driving component 300.

[0099] Figure 3 to Figure 5This is a schematic diagram of the mounting plate 120. The mounting plate 120 is a flat plate structure as a whole, and is provided with a long groove 121, a flat plate mounting hole 122, a flat plate mounting shaft 123 and a guide rail 124. The long groove 121 can cooperate with the clamping wheel axle 210, so that the clamping wheel axle 210 can move horizontally within the range limited by the long groove 121.

[0100] Figure 6-7 It is a three-dimensional schematic diagram of the slider 110. The outer side of the slider 110 includes a slider reset groove 113 for cooperating with the elastic member to provide a horizontal restoring force. The slider 110 is also provided with a slider mounting hole 111, a protrusion 114 and a guide rail 115. The protrusion 114 also includes a rotation limiter 116.

[0101] Figure 8 The figure shows a schematic diagram of a swinging member 140. The swinging member 140 is an equal-arm lever structure. The end of the swinging member 140 includes two symmetrical notches 141. A limiting platform 143 is provided on the notch 141. In the schematic diagram, the limiting platform 143 and the notch 141 are distributed in a step-like manner. A center hole 142 is provided in the center of the swinging member 140.

[0102] Fig.17 It is a schematic diagram of the clamping assembly 200, which includes a clamping axle 210, a clamping roller 220 and a second transmission gear 230. The clamping roller 220 and the second transmission gear 230 are sleeved on the clamping axle 210, and the clamping axle 210, the clamping roller 220 and the second transmission gear 230 rotate synchronously without relative rotation. Fig.18 331 , the first transmission gear 333 and the clutch shaft 331 are not rotated. The sharpening speed refers to the speed at which the pencil tip moves downward due to the gradual cutting of the pencil tip along the axial direction, and the feeding speed refers to the speed along the pencil axis at which the pencil is fed downward by the rotation of the clamping roller 220. When the feeding speed is greater than the sharpening speed, the friction wheel 332 and the clutch shaft 331 slip, and the clutch shaft 331 idles at this time to prevent the pencil from breaking due to excessive feeding.

[0103] See also Figures 9 to 15 , the working principle of the synchronization component 100 is as follows:

[0104] Initial state:

[0105] See also Figure 1 , Fig.19 The two sliders 110 move towards each other under the pressure of the elastic member 130. Driven by the slider 110, the clamping wheel shaft 210 also moves towards the pen entry hole 400, thereby driving the clamping roller 220 to move towards the pen entry hole 400. The clamping rollers 220 are pressed against each other, and the entire pen advancing and retracting mechanism is in a stable state.

[0106] The writing stage:

[0107] The mounting plate 120 is vertically fixed on the base 310, and the slider 110 slides into the guide rail 124 of the mounting plate 120 through the guide member 115. The two sliders 110 are centrally symmetrically arranged. The elastic member 130 is arranged on both sides of the two sliders 110 through the slider reset groove 113 to provide the two sliders 110 with a restoring force in the opposite direction. The flat mounting shaft 123 of the mounting plate 120 passes through the gap between the two sliders 110, and then cooperates with the central hole 142 of the swing member 140, and at the same time, the two notches 141 of the swing member 140 are respectively matched with the two protrusions 114 of the slider 110. Fig.15 , the clamping wheel shaft 210 passes through the long groove 121 of the mounting plate 120 and is inserted into the slider mounting hole 111 of the slider 110. When the pencil is inserted into the advance and retreat mechanism from the pen entry hole 400, as the part to be cut is gradually inserted, the surface to be cut contacts the clamping roller 220, so that the clamping assembly 200 is subjected to an outward force, and the two clamping assemblies 200 move away from each other. At this time, the clamping wheel shaft 210 moves away from each other in the long groove 121, thereby overcoming the elastic member 130 driving the two sliders 110 to move horizontally away from each other along the guide rail 124. Due to the cooperation between 114 and the notch 141, the swinging member 140 swings. Since the swinging member 140 is an equal-arm lever structure, the swinging member 140 forces the slider 110 to move horizontally only at equal distances, and then the equal-distance horizontal movement is transmitted to the clamping assembly 200, realizing automatic centering. When the protrusion 114 is matched with the notch 141 , the swinging member 140 can be buckled onto the surface of the slider 110 to achieve position limiting by moving the limiting member 116 and the limiting platform 143 , without interfering with the sliding of the slider 110 .

[0108] It is easy to understand that the swinging member 140 is set as an equal-arm lever structure, and the forces at both ends of the equal-arm lever are always equal in magnitude and opposite in direction. The sliders 110 symmetrically arranged at both ends of the center of the equal-arm lever drive the clamping assembly, so that the two clamping rollers 220 can always move towards the center of the pen-entry hole or away from the center of the pen-entry hole at the same time. If the magnitude of the forces on the two clamping rollers 220 is different, when the side with a larger force moves away from the center of the pen-entry hole, the force will also be transmitted to the other side through the equal-arm lever, so that the clamping wheel on the other side also moves equidistantly away from the center of the pen-entry hole at the same time, and vice versa. The center of the pen-entry hole can be always in the same position, so that the pencil is always in the same position without swinging, and it is not easy to deviate or break the core during cutting.

[0109] At the same time, the guide rail 124 on the mounting plate 120 is an integrated design with the mounting plate 120. The slider 110 and the mounting plate 120 slide in the form of a track. The slider 110 can only move in the direction of the guide rail 124. The guide rail 124 includes a baffle 125 in the schematic diagram, which can limit the slider 110 from sliding out perpendicular to the track direction, thereby making the overall structure simpler and saving costs.

[0110] Optionally, the cooperation between the slider 110 and the guide rail 124 may also be any structure that can slide along the transverse track and will not come off.

[0111] The swinging member 140 and the slider 110 are connected by means of a notch 141 and a protrusion 114. Optionally, the notch 141 is a slide groove structure, which can effectively ensure the transmission efficiency of the lever. At the same time, the limit platform 143 on the swinging member 140 and the rotation limit member 116 on the slider 110 can prevent the swinging member 140 from escaping in a direction perpendicular to the track, which also makes the structure and assembly simpler, thereby achieving the purpose of cost saving.

[0112] See also Figure 21-22 The back of the turntable 320 includes a power input shaft 324 with wheel teeth, which is connected to the tool holder assembly (not shown in the figure) and rotates synchronously. The turntable 320 includes a main body 321 and a disc tooth 322. The disc tooth 322 drives the power transmission gear 334 of the clutch 330 when rotating. The power transmission gear 334 and the clutch wheel shaft 331 can rotate synchronously, thereby driving the friction wheel 332 to rotate, and further the first transmission gear 333 rotates synchronously, and then the first transmission gear 333 transmits the rotation to the second transmission gear 230, thereby driving the clamping assembly 200 to rotate. This transmission process belongs to the conventional mode of the automatic pencil sharpener, so it is not described in detail.

[0113] Industrial Applicability

[0114] The utility model provides a pen-feeding and retracting mechanism for a pencil sharpener, wherein a synchronous component drives a slider through a swinging member to drive a pen-feeding component. Compared with the conventional structure in which each pen-feeding component is driven separately by an elastic member, the utility model adopts an equal-arm lever to drive the pen-feeding component through swinging, thereby ensuring that the displacement of the pen-feeding component in the horizontal direction is consistent, realizing automatic centering of the pen-feeding and retracting mechanism, and preventing the deviation of the pencil during the pen-feeding and retracting process and the breakage of the pencil core.

[0115] The principle and structure of the structure are simple, the cost is low, the stability and reliability are strong, and the adaptability is strong. It effectively solves the problem that the advance and retreat pen mechanism cannot be automatically centered, the pencil is easily offset, resulting in broken cores and affecting the cutting effect.

[0116] The terms and expressions used here are for description only, and the present invention should not be limited to these terms and expressions. The use of these terms and expressions does not mean to exclude any equivalent features of the illustrations and descriptions (or parts thereof), and it should be recognized that various modifications that may exist should also be included in the scope of the claims. Other modifications, changes and substitutions may also exist. Accordingly, the claims should be deemed to cover all such equivalents.

[0117] Similarly, it should be pointed out that although the utility model has been described with reference to the current specific embodiments, ordinary technicians in this technical field should realize that the above embodiments are only used to illustrate the utility model, and various equivalent changes or substitutions can be made without departing from the spirit of the utility model. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the essential spirit of the utility model, they will fall within the scope of the claims of the utility model.

Claims

1. A pencil sharpener feeding and retracting mechanism, used to feed pencils to be cut into or out of the pencil sharpener, characterized in that: The pen-advance-and-retract mechanism comprises: a synchronization component (100); a clamping component (200) and a driving component (300); the pen-advance-and-retract mechanism is a two-wheel structure, that is, the pen-advance-and-retract mechanism comprises two clamping components (200) arranged in parallel; the driving component (300) is arranged below the clamping components (200); the two clamping components (200) can rotate under the drive of the driving component (300); the two clamping components (200) Driven by the synchronization component (100), the two clamping components (200) can synchronously move toward or away from each other horizontally, and when the two clamping components (200) move synchronously, the displacement in the horizontal direction is the same.

2. The pencil sharpener advancing and retracting mechanism according to claim 1, characterized in that: The synchronization component (100) comprises a mounting plate (120) and a pair of sliders (110), wherein the pair of sliders (110) are centrally symmetrically arranged, and the clamping component (200) comprises a clamping wheel shaft (210) and a clamping wheel (220), wherein the clamping wheel (220) is sleeved on the clamping wheel shaft (210), and the clamping wheel shaft (210) is rotatably inserted on the sliders (110). The slider (110) can move horizontally along the mounting plate (120), and the slider (110) can drive the clamping wheel shaft (210) to move horizontally synchronously.

3. The pencil sharpener advancing and retracting mechanism according to claim 2, characterized in that: The synchronization component (100) further comprises an elastic member (130) and a swing member (140); at least a portion of the slider (110) abuts against the swing member (140); the swing member (140) can drive the slider (110) to move horizontally; and the elastic member (130) can provide a directional restoring force for the swing member (140).

4. The pencil sharpener advancing and retracting mechanism according to claim 3, characterized in that: The elastic member (130) is a U-shaped spring, and both ends of the U-shaped spring are respectively mounted on the outer side of the slider (110) to provide a restoring force.

5. The pencil sharpener advancing and retracting mechanism according to claim 4, characterized in that: The driving assembly (300) comprises a base (310), a rotating disk (320) and a clutch (330); the clutch (330), the rotating disk (320) and the base (310) are arranged in sequence from top to bottom; a clutch wheel shaft (331) of the clutch (330) is arranged parallel to the clamping wheel shaft (210); the base (310) is fixedly arranged; the rotating disk (320) and the base (310) are coaxially arranged and can rotate around the axis; the rotating disk (320) can transfer power to the clutch (330), and then the clutch (330) transfers power to the clamping assembly (200).

6. The pencil sharpener advancing and retracting mechanism according to claim 5, characterized in that: The clamping wheel (220) is made of soft rubber material.

7. The pencil sharpener advancing and retracting mechanism according to claim 6, characterized in that: The sliding block (110) comprises a protrusion (114), the swinging member (140) comprises a notch (141), and the protrusion (114) can be inserted into the notch (141).

8. The pencil sharpener advancing and retracting mechanism according to claim 7, characterized in that: The clutch member (330) is sleeved with a first transmission gear (333) along the clutch wheel shaft (331), and the clamping wheel shaft (210) is sleeved with a second transmission gear (230), and at least a portion of the first transmission gear (333) and the second transmission gear (230) can mesh with each other to transmit power.

9. The pencil sharpener advancing and retracting mechanism according to claim 8, characterized in that: The clutch wheel shaft (331) is sleeved with a friction wheel (332), wherein: When the pencil sharpening speed is equal to the pencil feeding speed, the friction wheel (332) can rotate synchronously with the clutch wheel shaft (331); When the pencil sharpening speed is lower than the pencil advancing speed, the friction wheel (332) can slip with the clutch wheel shaft (331).

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