Paper cutter with blade capable of being replaced quickly

Abstract

The utility model relates to the technical field of paper cutting knives, in particular to a paper cutting knife with a blade capable of being replaced quickly, when a push button assembly moves to an unlocking position, the push button assembly jacks up a blade frame to an avoiding position to enable the blade to be separated from the blade frame, and at the moment, the blade can be taken out; when the push button assembly leaves the unlocking position, the blade frame is reset; when the push button assembly drives the blade frame to move to the end far away from the unlocking position, the blade cover assembly pushes the other blade to automatically complement the position and be connected with the blade frame in a clamped mode. In order to solve the problem of low blade replacement efficiency, the utility model provides the paper cutter capable of quickly replacing the blade, the paper cutter has a blade storage function, the blade can be replaced without other extra tools, the blade replacement efficiency can be improved, and the safety in the blade replacement process can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of paper cutters, and more specifically to a paper cutter with a blade that can be quickly replaced. Background Art

[0002] Paper cutters are usually used to cut paper and other objects. Similar to utility knives, their blades are generally thinner for easier cutting, so they are prone to wear and breakage. When replacing the blade of a conventional paper cutter, a screwdriver is needed to separate the blade from the handle, then the blade is taken out and replaced, and then the screwdriver is used to tighten the blade and the handle. On the one hand, the efficiency of blade replacement is low, and on the other hand, an external tool screwdriver is required, otherwise the blade cannot be replaced, which brings inconvenience to users. Utility Model Content

[0003] The purpose of the utility model is to overcome the problem of low blade replacement efficiency and provide a paper cutter with a blade that can be quickly replaced. The utility model has a blade storage function and can replace the blade without the need for additional tools, thereby improving the blade replacement efficiency and ensuring the safety during the blade replacement process.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A paper knife with a blade that can be quickly replaced comprises a push button assembly, a limiting piece, a blade holder, a handle, at least two blades, and a blade cover assembly, wherein the blade is installed in the handle, the blade holder is installed between the limiting piece and the handle and is clamped with the blade close to the blade holder, the limiting piece and the blade cover assembly are respectively arranged on both sides of the handle and are fixedly connected to the handle, the push button assembly passes through the limiting piece and is clamped with the blade holder, the push button assembly is movably connected with the limiting piece and the handle respectively, an unlocking position is provided at the end of the limiting piece, and an avoidance position is provided at the end of the handle corresponding to the unlocking position, and the blade cover assembly elastically abuts against the side of the blade away from the blade holder; the push button assembly can drive the blade holder and the blade to move relative to the handle, and when the push button assembly moves to the unlocking position, the push button assembly lifts the blade holder to the avoidance position to make the blade detach from the blade holder, and the blade can be taken out at this time; when the push button assembly leaves the unlocking position, the blade holder is reset; when the push button assembly drives the blade holder to move to the end away from the unlocking position, the blade cover assembly pushes another blade to automatically fill the position and is clamped with the blade holder.

[0006] The utility model uses a blade holder to fix the blade, and then installs it in the handle, limits the push button assembly by a limiting piece, and the blade holder is clamped with the blade. When the push button assembly is pushed to move along the limiting piece, the blade holder and the blade can be driven to follow the movement, so that the blade can be freely switched between different states of fully extending the handle, partially extending the handle, and completely stored in the handle. The length of the blade extending from the handle can be adjusted steplessly and can be adjusted accordingly according to the needs of the user. The handle can be used to store spare blades for easy replacement of blades. When it is necessary to replace the blade, the push button assembly is pushed to the unlocking position. At this time, the push button assembly lifts the blade holder to the avoidance position, and the blade is separated from the blade holder. At this time, the blade limit of the blade holder has been released and the blade can be taken out from the handle; the push button assembly is then separated from the unlocking position, and the blade holder is reset. However, since the blade holder has returned to its original position at this time, when the blade is in the storage state, the position of the blade holder is the original position of the blade holder. When the blade is in the state of fully extending the handle, the position of the blade holder will block the spare blade, and the spare blade cannot fill the position. Only when the push button assembly is pushed to move the blade holder to the end of the limiting piece away from the unlocking position, under the elastic drive of the blade cover assembly, since the original blade position is vacant, the spare blade can automatically fill the position at this time. The automatically filled spare blade becomes a new blade and is fixed by the blade holder. It can follow the blade holder to move relative to the handle under the drive of the push button assembly, thereby realizing the change of the blade relative to the handle in different states. The paper cutter of the utility model can realize the shearing function of an ordinary paper cutter, and, without the aid of external tools, the blade can be taken out and the spare blade can be automatically replaced by changing the position of the push button assembly on the limit plate, thereby realizing rapid replacement of the blade. The whole process is relatively simple and safe.

[0007] Furthermore, a blade slot is provided on the handle, and the blades are all installed in the blade slot, a first clamping portion is provided on the blade holder, and a second clamping portion is provided on the blade, the first clamping portion is clamped with the second clamping portion, a movable slot is provided on the limiting plate, the unlocking position is an unlocking slot, the unlocking slot is connected to the end of the movable slot, the push button assembly passes through the movable slot and is clamped with the blade holder, the push button assembly can be clamped with the unlocking slot, and the avoidance position is set at the position of the blade slot corresponding to the unlocking slot; when the push button assembly is clamped with the unlocking slot, the push button assembly lifts the first clamping portion to the avoidance position so that the first clamping portion is disengaged from the second clamping portion, and the blade can be taken out at this time; when the push button assembly leaves the unlocking slot, the first clamping portion is reset; when the push button assembly drives the blade holder to align the first clamping portion with the second clamping portion of the blade in the blade slot, the blade cover assembly pushes another blade to automatically fill the position, and the blade holder is clamped with the second clamping portion of the blade through the first clamping portion. The blade slot is used to accommodate the blade; the first clamping portion is clamped with the second clamping portion to realize the clamping of the blade and the blade holder; the setting of the movable slot enables the push button assembly to slide relative to the limiting piece.

[0008] Furthermore, one end of the first clamping part is connected to the blade holder, and the other end is cantilevered; a slide groove is provided below the cantilever end of the first clamping part, and the push button assembly can lift the first clamping part from the slide groove. The first clamping part arranged on the cantilever can be easily swung up and down to engage or release the engagement with the second clamping part, thereby realizing the locking and unlocking of the blade by the blade holder. The provision of the slide groove can facilitate the push button assembly to lift the first clamping part to disengage it from the second clamping part.

[0009] Furthermore, the handle is provided with a first limiting portion at the blade slot, and the blade is provided with a second limiting portion, the first limiting portion is engaged with the second limiting portion, and the length of the first limiting portion is less than the depth of the blade slot. The arrangement of the first limiting portion and the second limiting portion can facilitate limiting the blade in the blade slot to prevent the blade from shaking in the blade slot; the length of the first limiting portion is less than the depth of the blade slot, so that the blade closest to the blade holder side is not restricted by the first limiting portion, and can move back and forth with the blade holder relative to the handle under the drive of the push button assembly. Only the blade close to the limiting sheet side in the blade slot can be engaged with the blade holder, and the remaining blades are stored in the blade slot as spare blades. The spare blade is limited by the first limiting portion and the second limiting portion, and can be fixedly placed in the blade slot and will not move at will. Even if the blade cover continues to apply elastic force to the spare blade at this time, due to the limitation of the position space, there is no vacancy in the position of the blade engaged with the blade holder, and the spare blade will not automatically fill the position.

[0010] Furthermore, the limiting piece is provided with a plurality of limiting grooves in sequence along the length direction of the movable groove, the limiting grooves are connected to the movable groove, and the limiting grooves and the unlocking grooves are respectively located at the upper and lower sides of the movable groove. The limiting grooves are used to lock the push button assembly after adjusting the relative position of the blade and the handle, so that the position of the blade holder and the blade can be locked, so that the relative position of the blade and the handle remains unchanged. The setting of the unlocking groove position is used to lift the first clamping part of the blade holder at the slide groove on the blade holder to unlock the blade, while the limiting groove is to lock the position of the blade while keeping the blade holder and the blade in the clamping state. Therefore, setting the limiting groove and the unlocking groove to be respectively located at the upper and lower sides of the movable groove can ensure the function of the blade in different states and avoid misoperation.

[0011] Furthermore, the limiting groove at least includes a first limiting groove and a second limiting groove, the first limiting groove and the second limiting groove are respectively arranged at the two ends of the movable groove, and the first limiting groove and the unlocking groove are arranged opposite to each other. The first limiting groove and the second limiting groove can respectively make the blade be located at two extreme positions on the handle, one extreme position is a state where the blade is completely extended out of the handle, and the other extreme position is a state where the blade is completely retracted into the handle. Specifically, the first limiting groove is located near the end where the blade extends out of the handle, and the second limiting groove is located away from the end where the blade extends out of the handle; when the push button assembly is located at the first limiting groove, the blade is completely extended out of the handle; when the push button assembly is located at the second limiting groove, the blade is completely retracted into the handle.

[0012] Furthermore, the limiting groove also includes a third limiting groove, which is arranged between the first limiting groove and the second limiting groove and is located near the first limiting groove. The third limiting groove is arranged to limit the blade in the middle position between the two extreme positions of fully extending the handle and fully retracting the handle. When the push button assembly is located in the third limiting groove, the blade is in a state of partially extending the handle. Within the scope of knowledge of those skilled in the art, more limiting grooves can be arranged in the middle position between the first limiting groove and the second limiting groove to respectively limit the length of the blade extending out of the handle in sequence; or, each limiting groove can be replaced with a fastener, and after adjusting the relative position of the blade and the handle, the push button assembly is directly locked in the movable groove of the limiting plate by the fastener, so as to achieve the same technical effect of limiting the push button assembly in the limiting groove, and the scheme of fastening the push button assembly with a fastener can also realize stepless adjustment of the position of the blade relative to the handle.

[0013] Furthermore, the push button assembly includes a push button, a locking block, a slider, and a spring. The push button is fixed to the locking block by riveting, the push button is slidably connected to the slider, the spring is installed in the slider and pre-presses the push button to press the push button in a locked position, the push button can drive the locking block to move along the slider, and the locking block can be engaged with an unlocking groove or a limiting groove. The slider is used for installing the push button, the locking block, and the spring. The slider is slidably connected to the movable groove of the limiting plate, the push button is slidably connected to the slider, the push button can drive the locking block to move along the slider, so that the locking block can be engaged with the unlocking groove or the limiting groove. When the locking block is engaged with the unlocking groove, the first engaging portion can be lifted up, so that the blade holder and the blade are unlocked; when the locking block is engaged with the first limiting groove, the second limiting groove, and the third limiting groove, the relative position of the blade and the handle can be maintained unchanged. The setting of the spring can lock the push button, so that after the relative position of the push button and the slider is adjusted, the push button can always keep its position unchanged, so that the locking block maintains the clamping connection with the unlocking groove or the limiting groove.

[0014] Furthermore, the blade cover assembly includes a blade cover and a spring sheet, wherein the spring sheet is installed on the blade cover near the blade side and protrudes from the blade cover. The blade cover can not only facilitate the installation of the spring sheet, but also protect the spare blade and improve the appearance integrity of the paper knife. The spring sheet is used to provide elastic force, and the spring sheet provides squeezing force on the spare blade in the blade slot, so that when there is a vacant blade on the blade holder and the first clamping part of the blade holder is aligned with the second clamping part of the spare blade, the spare blade automatically fills the position, thereby timely filling the vacant blade and realizing the function of blade replacement.

[0015] Furthermore, the spring piece is an arc-shaped structure, and the arc-shaped raised side abuts against the blade. The spring piece with an arc-shaped structure is convenient for automatically filling the spare blade in the blade slot.

[0016] Furthermore, it also includes a facing sheet, the facing sheet is provided with a through slot, the push button assembly is movably arranged in the through slot, the limit sheet is located between the facing sheet and the handle, and the facing sheet is connected to the handle. The facing sheet protects the blade from the other side of the handle relative to the blade cover, and improves the aesthetics of the paper cutter.

[0017] The beneficial effects of the utility model are:

[0018] ① Improve the safety of blade replacement operation, enhance the safety of blade replacement, and ensure the safety of users;

[0019] ②Improve the efficiency of blade replacement, realize rapid blade replacement, and greatly improve the efficiency of blade replacement;

[0020] ③ Improve the lack of blade storage function. Spare blades can be stored in the blade slot. On the one hand, it realizes automatic blade replacement and improves the convenience and efficiency of blade replacement. On the other hand, it is convenient for users to use without having to find spare blades when replacing blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an exploded view of the utility model.

[0022] Figure 2 It is a schematic diagram of the structure of the utility model.

[0023] Figure 3 for Figure 2 AA section view.

[0024] Figure 4 It is a schematic diagram of the matching relationship between the tool holder 4 and the push button assembly of the utility model.

[0025] Figure 5 The figure is a schematic diagram of the position relationship of the locking block in the push button assembly of the utility model when the blade is in the storage state.

[0026] Figure 6 It is a schematic diagram of the matching relationship between the push button and the slider of the utility model.

[0027] Figure 7 It is a structural schematic diagram of the push button assembly of the utility model.

[0028] Figure 8 It is a schematic diagram of the matching relationship between the locking block and the limiting piece of the utility model.

[0029] Fig. 9 It is a structural schematic diagram of the blade cover assembly of the utility model.

[0030] Fig.10 It is a schematic diagram of the position of the blade storage slot and the blade in the handle of the utility model.

[0031] Fig.11 It is a schematic diagram of the blade storage state of the utility model.

[0032] Fig.12 It is a schematic diagram of the blade of the utility model in use.

[0033] Fig.13 This is a schematic diagram of the blade unlocking process of the utility model.

[0034] Fig.14 It is a schematic diagram of the push button assembly of the utility model in a stored and locked state.

[0035] Fig.15 This is a schematic diagram of the push button assembly of the utility model in a stored and locked state with the slider removed.

[0036] Fig.16 This is a schematic diagram of the push button assembly of the utility model in a state where it can slide along the movable groove.

[0037] Fig.17 This is a schematic diagram of the push button assembly of the utility model in an unlocked state with the slider removed.

[0038] Fig.18 It is a schematic diagram of the push button assembly when the blade of the utility model is in the unlocked state.

[0039] Fig.19 This is a schematic diagram of the push button assembly of the utility model with the slider removed when the blade is in the unlocked state.

[0040] The illustrations are as follows:

[0041] 1. facing sheet; 11. through slot; 2. push button assembly; 21. push button; 22. locking block; 23. slider; 24. spring; 3. limiting sheet; 31. movable slot; 311. unlocking slot; 312. first limiting slot; 313. second limiting slot; 314. third limiting slot; 4. blade holder; 41. first clamping part; 42. slide slot; 5. handle; 51. blade slot; 511. avoidance position; 52. first limiting part; 6. blade; 61. second clamping part; 62. second limiting part; 7. blade cover assembly; 71. blade cover; 72. spring piece. DETAILED DESCRIPTION

[0042] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0043] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0044] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0045] Example 1

[0046] like Figures 1 to 19The utility model is shown as an embodiment 1 of a paper knife with a blade that can be quickly replaced, comprising a push button assembly 2, a limiting piece 3, a blade holder 4, a handle 5, at least two blades 6, and a blade cover assembly 7. The handle 5 is provided with a blade slot 51, and the blades 6 are all installed in the blade slot 51. The blade holder 4 is installed between the limiting piece 3 and the handle 5 and is clamped with the blade 6 close to the blade holder 4. The blade holder 4 is provided with a first clamping portion 41, and the blade 6 is provided with a second clamping portion 61. The first clamping portion 41 is clamped with the second clamping portion 61. The limiting piece 3 and the blade cover assembly 7 are respectively arranged on both sides of the handle 5 and are fixedly connected to the handle 5. The limiting piece 3 is provided with a movable slot 31, and the end of the movable slot 31 is connected to an unlocking slot 311. The push button assembly 2 passes through the movable slot 31 and is clamped with the blade holder 4. The push button assembly 2 is movably connected to the limiting piece 3 and the handle 5 respectively. The button assembly 2 can also be engaged with the unlocking groove 311, and the blade groove 51 is provided with an avoidance position 511 at a position corresponding to the unlocking groove 311, and the blade cover assembly 7 is elastically abutted against the side of the blade 6 away from the blade holder 4; the push button assembly 2 can drive the blade holder 4 and the blade 6 to move relative to the handle 5. When the push button assembly 2 is engaged with the unlocking groove 311, the push button assembly 2 lifts the first clamping portion 41 to the avoidance position 511 to disengage the first clamping portion 41 from the second clamping portion 61, and the blade 6 can be taken out at this time; when the push button assembly 2 leaves the unlocking groove 311, the first clamping portion 41 is reset; when the push button assembly 2 drives the blade holder 4 to align the first clamping portion 41 with the second clamping portion 61 of the blade 6 in the blade groove 51, the blade cover assembly 7 pushes another blade 6 to automatically fill the position, and the blade holder 4 is engaged with the second clamping portion 61 of the blade 6 through the first clamping portion 41.

[0047] The utility model has a blade storage compartment, namely a blade slot 51, inside which the push button assembly 2 is pushed to a specified position to automatically fill the blade 6, thereby realizing a structure of automatically replacing the blade 6. The push button assembly 2 realizes the combination of the two functions of locking the position and unlocking the blade 6.

[0048] Specifically, one end of the first clamping portion 41 is connected to the blade holder 4, and the other end is cantilevered; a slide groove 42 is provided below the cantilever end of the first clamping portion 41, and the push button assembly 2 is slidably connected to the slide groove 42, and the push button assembly 2 can lift the first clamping portion 41 from the slide groove 42. Further, the handle 5 is also provided with a first limiting portion 52 at the slot 51 of the blade 6, and a second limiting portion 62 is provided on the blade 6. The first limiting portion 52 is clamped with the second limiting portion 62, and the length of the first limiting portion 52 is less than the depth of the blade slot 51. Furthermore, the limiting sheet 3 is also provided with a plurality of limiting grooves in sequence along the length direction of the movable slot 31, and the limiting grooves are connected to the movable slot 31, and the limiting grooves and the unlocking groove 311 are respectively located at the upper and lower sides of the movable slot 31. The limiting groove at least includes a first limiting groove 312 and a second limiting groove 313, the first limiting groove 312 and the second limiting groove 313 are respectively arranged at two ends of the movable groove 31, and the first limiting groove 312 is arranged opposite to the unlocking groove 311. Preferably, the limiting groove also includes a third limiting groove 314, which is arranged between the first limiting groove 312 and the second limiting groove 313 and is located near the first limiting groove 312.

[0049] As an improved solution of this embodiment, the push button assembly 2 includes a push button 21, a locking block 22, a slider 23, and a spring 24. The push button 21 and the locking block 22 are fixed by riveting. The push button 21 and the slider 23 are slidably connected. The spring 24 is installed in the slider 23 and pre-presses the push button 21 to press the push button 21 in the locked state position. The push button 21 can drive the locking block 22 to move along the slider 23, and the locking block 22 can be engaged with the unlocking groove 311 or the limit groove.

[0050] In this embodiment, the blade holder 4 is in surface contact with the handle 5, the blade holder 4 is linearly slidably matched in the handle 5, the locking block 22 is in surface contact with the blade holder 4, the locking block 22 is linearly slidably matched in the blade holder 4, the blade cover assembly 7 is assembled with the handle 5 through a detachable structure, and the blade 6 is received in the blade slot 51 of the handle 5. The push button 21 is fixed to the locking block 22 by riveting and is installed between the sliders 23, and the spring 24 is installed in the slider 23 and pre-presses the push button 21 to press the push button 21 in the locked state position.

[0051] The technical effects and advantages of the utility model are as follows: the blade 6 can be quickly replaced by the reciprocating pushing action of the push button assembly 2. The specific working principle is that the blade 6 is stored in the blade slot 51 of the handle 5, and the blade 6 is subjected to the elastic pre-pressure of the blade cover assembly 7, so that the blade 6 in the blade slot 51 is pressed against the side of the blade holder 4. When the blade 6 is in the storage state, there are two possible modes, one is that there is already a blade 6 in the blade holder 4, and the blade 6 will not be added, and the other is that there is no blade in the blade holder 4 and the blade 6 will be added. The locking cam 314 is in the locked state, and the locking block 22 is in the second limit groove 313 of the storage gear of the locking cam 3, and the slider 23 is in the locked state and cannot be pushed. In the locked state, the locking block 22 is in the second limiting groove 313 of the storage gear of the limiting piece 3. The push button 21 is pushed to make the locking block 22 slide out of the second limiting groove 313 of the storage gear of the limiting piece 3, then the push button 21 is in the unlocked state, and the slider 23 can be pushed; the slider 23 is pushed from the storage gear on the limiting piece 3 to the front end direction, then the locking block 22 can enter the third limiting groove 314 of the short distance gear of the blade 6 on the limiting piece 3 or the first limiting groove 312 of the long distance gear of the blade 6, thereby realizing the use states of the paper knife in which the paper knife extends a short distance of the blade 6 and a long distance of the blade 6, respectively. When the slider 23 is pushed to the position of the long distance gear of the blade 6 of the limiting plate 3, the push button 21 is pushed again to make the locking block 22 in the unlocking groove 311 of the blade 6 of the limiting plate 3, and the end of the locking block 22 pushes open the first clamping part 41 of the blade holder 4. Preferably, the first clamping part 41 is a hook lock, and the second clamping part 61 is a groove, so that the second clamping part of the blade 6 is separated from the locking of the first clamping part 41 of the blade holder 4. At this time, the blade 6 can be removed from the paper cutter, and there is no blade 6 in the blade holder 4. Finally, the push button 21 is pushed to make the locking block 22 outside the first limiting groove 312 of the long distance gear of the blade 6 of the limiting plate 3, and the slider 23 is pushed to move to the storage gear of the limiting plate 3, that is, the second limiting groove 313. When the locking block 22 is in the storage gear of the limiting plate 3, that is, the second limiting groove 313, the blade 6 is squeezed by the blade cover assembly 7 and automatically filled into the blade holder 4, and finally the function of quickly replacing the blade 6 is realized.

[0052] Example 2

[0053] This embodiment is a second embodiment of a paper knife with a blade that can be quickly replaced. This embodiment is similar to the first embodiment, except that the blade cover assembly 7 includes a blade cover 71 and a spring 72. The spring 72 is installed on the blade cover 71 near the blade 6 and protrudes from the blade cover 71. Preferably, the spring 72 is an arc-shaped structure, and the arc-shaped raised side abuts against the blade 6.

[0054] The blade cover 71 can be used to install the spring piece 72, protect the spare blade 6, and improve the appearance integrity of the paper knife. The spring piece 72 is used to provide elastic force, and the spring piece 72 provides a squeezing force on the spare blade in the blade slot 51, so that when there is a vacant blade on the blade holder 4 and the first clamping portion 41 of the blade holder 4 is aligned with the second clamping portion 61 of the spare blade 6, the spare blade 6 automatically fills the vacant blade 6 in time, and the function of replacing the blade 6 is realized.

[0055] Example 3

[0056] This embodiment is another embodiment of a paper cutter with a blade that can be quickly replaced. This embodiment is similar to the first embodiment, except that it further includes a facing sheet 1, the facing sheet 1 is provided with a through slot 11, the push button assembly 2 is movably arranged in the through slot 11, and the facing sheet 1 is also connected to the limiter sheet 3. The limiter sheet 3 and the facing sheet 1 are fixedly connected by a riveting process, the push button assembly 2 performs linear sliding cooperation between the facing sheet 1 and the limiter sheet 3, and the facing sheet 1 is fixedly connected to the handle 5 by screws.

[0057] The facing sheet 1 protects the blade 6 from the other side of the handle 5 relative to the blade cover 71 and improves the aesthetics of the paper knife.

[0058] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A paper cutter with a blade that can be quickly replaced, characterized in that: The invention comprises a push button assembly (2), a limiting plate (3), a blade holder (4), a handle (5), at least two blades (6), and a blade cover assembly (7); the blade (6) is installed in the handle (5); the blade holder (4) is installed between the limiting plate (3) and the handle (5) and is clamped with the blade (6) close to the blade holder (4); the limiting plate (3) and the blade cover assembly (7) are respectively arranged on both sides of the handle (5) and are fixedly connected to the handle (5); the push button assembly (2) passes through the limiting plate (3) and is clamped with the blade holder (4); the push button assembly (2) is movably connected with the limiting plate (3) and the handle (5) respectively; an unlocking position is provided at the end of the limiting plate (3); and the end of the handle (5) corresponds to the unlocking position. The handle (5) is provided with an escape position (511), and the blade cover assembly (7) elastically abuts against the side of the blade (6) away from the blade holder (4); the push button assembly (2) can drive the blade holder (4) and the blade (6) to move relative to the handle (5); when the push button assembly (2) moves to the unlocking position, the push button assembly (2) lifts the blade holder (4) to the escape position (511) so that the blade (6) is separated from the blade holder (4), and the blade (6) can be taken out at this time; when the push button assembly (2) leaves the unlocking position, the blade holder (4) is reset; when the push button assembly (2) drives the blade holder (4) to move to the end away from the unlocking position, the blade cover assembly (7) pushes another blade (6) to automatically fill the position and engage with the blade holder (4).

2. The paper cutter with a quickly replaceable blade according to claim 1, characterized in that: The handle (5) is provided with a blade slot (51), the blades (6) are all mounted in the blade slot (51), the blade holder (4) is provided with a first clamping portion (41), the blade (6) is provided with a second clamping portion (61), the first clamping portion (41) is clamped with the second clamping portion (61), the limiting piece (3) is provided with a movable slot (31), the unlocking position is an unlocking slot (311), the unlocking slot (311) is connected with the end of the movable slot (31), the push button assembly (2) passes through the movable slot (31) and is clamped with the blade holder (4), the push button assembly (2) can be clamped with the unlocking slot (311), and the avoidance position (511) is provided in the blade slot (51) corresponding to the unlocking slot (311) when the push button assembly (2) is engaged with the unlocking slot (311), the push button assembly (2) lifts the first engaging portion (41) to the avoidance position (511) so that the first engaging portion (41) is separated from the second engaging portion (61), and the blade (6) can be taken out at this time; when the push button assembly (2) leaves the unlocking slot (311), the first engaging portion (41) is reset; when the push button assembly (2) drives the blade holder (4) to align the first engaging portion (41) with the second engaging portion (61) of the blade (6) in the blade slot (51), the blade cover assembly (7) pushes another blade (6) to automatically fill the position, and the blade holder (4) is engaged with the second engaging portion (61) of the blade (6) through the first engaging portion (41).

3. The paper cutter with a quickly replaceable blade according to claim 2, characterized in that: One end of the first clamping portion (41) is connected to the blade holder (4), and the other end is cantilevered; a slide groove (42) is provided below the cantilever end of the first clamping portion (41), and the push button assembly (2) can lift the first clamping portion (41) from the slide groove (42).

4. The paper cutter with a quickly replaceable blade according to claim 2, characterized in that: The handle (5) is also provided with a first limiting portion (52) located at the blade slot (51), and the blade (6) is provided with a second limiting portion (62), the first limiting portion (52) is engaged with the second limiting portion (62), and the length of the first limiting portion (52) is less than the depth of the blade slot (51).

5. The paper cutter with a quickly replaceable blade according to any one of claims 2 to 4, characterized in that: The limiting plate (3) is also provided with a plurality of limiting grooves in sequence along the length direction of the movable groove (31); the limiting grooves are connected to the movable groove (31); and the limiting grooves and the unlocking groove (311) are respectively located at the upper and lower sides of the movable groove (31).

6. The paper cutter with a quickly replaceable blade according to claim 5, characterized in that: The limiting groove at least comprises a first limiting groove (312) and a second limiting groove (313); the first limiting groove (312) and the second limiting groove (313) are respectively arranged at two ends of the movable groove (31), and the first limiting groove (312) and the unlocking groove (311) are arranged opposite to each other.

7. The paper cutter with a quickly replaceable blade according to claim 6, characterized in that: The limiting groove further comprises a third limiting groove (314), and the third limiting groove (314) is arranged between the first limiting groove (312) and the second limiting groove (313) and is located close to the first limiting groove (312).

8. The paper cutter with a quickly replaceable blade according to claim 5, characterized in that: The push button assembly (2) comprises a push button (21), a locking block (22), a slider (23), and a spring (24); the push button (21) and the locking block (22) are fixed by riveting; the push button (21) and the slider (23) are slidably connected; the spring (24) is installed in the slider (23) and pre-presses the push button (21) to press the push button (21) in a locked position; the push button (21) can drive the locking block (22) to move along the slider (23); and the locking block (22) can be engaged with an unlocking groove (311) or a limiting groove.

9. The paper cutter with a quickly replaceable blade according to claim 1, characterized in that: The blade cover assembly (7) comprises a blade cover (71) and a spring sheet (72). The spring sheet (72) is arranged on the blade cover (71) near the blade (6) and protrudes from the blade cover (71).

10. The paper cutter with a quickly replaceable blade according to claim 1, characterized in that: The device further comprises a facing sheet (1), wherein the facing sheet (1) is provided with a through slot (11), wherein the push button assembly (2) is movably arranged in the through slot (11), and wherein the limiting sheet (3) is located between the facing sheet (1) and the handle (5), and the facing sheet (1) is connected to the handle (5).

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