Gland for paper shredder and paper shredder

Abstract

The utility model relates to a gland for a paper shredder. The gland comprises a frame body, a machine cover, an inner shell and a pressing component, a left cutter shaft and a right cutter shaft which can rotate are arranged below the inner shell, and the left cutter shaft and the right cutter shaft are sleeved with a plurality of sets of annular blades with cutter points. A paper feeding slot is formed in the top of the machine cover and is used for shredding paper without opening the cover; the downward pressing assembly comprises a left pressing shaft and a right pressing shaft which are symmetrically arranged above the left cutter shaft and the right cutter shaft, and the axis direction of the left pressing shaft and the axis direction of the right pressing shaft are the same as the axis direction of the left cutter shaft and the axis direction of the right cutter shaft. When the downward pressing assembly descends to a limit position, the left pressing shaft is tangent to a tool nose on the annular blade on the left cutter shaft, and the right pressing shaft is tangent to a tool nose on the annular blade on the right cutter shaft; the left pressing shaft, the right pressing shaft and the tool nose are prevented from being overcut and collided. A plurality of pieces of paper can be placed at a time by opening the cover, and the problem that large paper is placed for multiple times is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of shredders, in particular to a pressure cover for a shredder. Background Art

[0002] As a commonly used office equipment, shredders are widely used. They can be used to shred paper, optical discs, etc. to prevent the leakage of important information.

[0003] Currently, an automatic paper feeding shredder appears on the market, which includes: a housing, a shredding core disposed in the housing, a feeding device disposed above the shredding core and used to suck and convey paper to the shredding core, a lid that can be opened and disposed on the housing, and a collection bucket installed below the shredding core. The feeding device includes: a paper placement platform disposed above the shredding core and a pair of paper feeding rollers disposed on the paper placement platform. Among them, an inlet for clamping and conveying paper to the shredding core is formed between the paper feeding rollers.

[0004] During use, the user opens the lid, places the stack of paper to be shredded on the paper placement platform, and then closes the lid. At this time, the inner surface of the lid presses the paper. Start the machine, and the paper to be shredded is successively sucked into the shredding core from the inlet through the friction of the paper feeding rollers. The shredding core shreds the paper, and the shredded paper flows into the collection bucket to complete the automatic paper feeding and shredding actions.

[0005] However, the current shredders on the market have a single function and cannot meet the requirements for multiple functions for single sheets, multiple sheets, and large-sized papers. Moreover, the lid cannot be opened to place multiple sheets at once, and large-sized papers are prone to jamming. Content of the Utility Model

[0006] The technical problem to be solved by the utility model is to meet the requirements for multiple functions of single sheets, multiple sheets, and large-sized papers on a single shredder, enable multiple sheets to be placed at once when the lid is opened, and solve the problem of large-sized paper jamming.

[0007] To solve the above technical problem, the utility model provides a pressure cover for a shredder, which includes a frame body, a machine cover, an inner housing, and a downward pressing component; a rotatable left knife shaft and a right knife shaft are disposed below the inner housing, and multiple groups of annular blades with knife tips are sleeved on the left knife shaft and the right knife shaft; a paper feeding slot is opened at the top of the machine cover for shredding without opening the lid; the downward pressing component includes a left pressing shaft and a right pressing shaft symmetrically disposed above the left knife shaft and the right knife shaft, and the axes of the left pressing shaft and the right pressing shaft are in the same direction as the axes of the left knife shaft and the right knife shaft; when the downward pressing component descends to the limit position, the left pressing shaft is tangent to the knife tip on the annular blade of the left knife shaft, and the right pressing shaft is tangent to the knife tip on the annular blade of the right knife shaft; to avoid over-cutting and collision between the left pressing shaft, the right pressing shaft and the knife tip.

[0008] Preferably, the paper feed slot is arranged directly above the left pressure roller and the right pressure roller, so that the paper fed through the paper feed slot can smoothly enter between the left cutter shaft and the right cutter shaft. The center lines of the radial cross-sections of the left pressure roller and the right pressure roller, the center lines of the radial cross-sections of the left cutter shaft and the right cutter shaft, and the center line of the vertical cross-section of the paper feed slot along the axis of the left pressure roller are collinear. First proximity switches are arranged on both sides of the paper feed slot for detecting paper feed signals and controlling the start and stop of the shredding motor.

[0009] Preferably, the pressing component further includes a connecting rod, a long slot, a pressure roller seat, and a connecting column. The two ends of the left pressure roller and the right pressure roller are movably arranged on the pressure roller seat, so that the left pressure roller and the right pressure roller can rotate on the pressure roller seat. The pressure roller seat is slidably arranged in the long slot opened on the connecting rod through the fixedly arranged connecting column.

[0010] Preferably, the connecting rod is L-shaped, and when the machine cover is in the closed state, the long slot on the connecting rod is vertically arranged relative to the machine cover, so that the left pressure roller and the right pressure roller can move up and down during the shredding operation.

[0011] Preferably, the pressure roller seat is an isosceles triangle, and the left pressure roller and the right pressure roller are symmetrically arranged on the pressure roller seat, so that the left pressure roller and the right pressure roller drop to the same position under the action of their own gravity.

[0012] Preferably, sliding grooves are opened on both sides of the inner housing near the ends of the left cutter shaft and the right cutter shaft. The connecting column is slidably arranged in the sliding grooves. The sliding grooves are composed of inclined grooves and longitudinal grooves. The inclined grooves are inclined relative to the horizontal plane for restricting the running track of the connecting column. The longitudinal grooves are vertically arranged relative to the horizontal plane for restricting the extreme positions of the pressing component symmetrically arranged above the left cutter shaft and the right cutter shaft, so that the pressing component moves vertically up and down.

[0013] Preferably, the shredder gland further includes a wedge-shaped lock for restricting the upward opening of the machine cover caused by the reverse thrust of the cutter shaft rotation on the paper. The wedge-shaped lock includes a fixed groove plate, a trapezoidal stop block, and a guiding slide rod. Multiple groups of guiding slide rods are arranged and slidably arranged on the fixed groove plate. One end of the guiding slide rod is fixedly connected to the trapezoidal stop block. A lock insert is arranged on the machine cover, and an insert hole is opened on the insert, so that when the machine cover is in the closed state, the trapezoidal stop block can be inserted into the insert hole to lock the machine.

[0014] Preferably, the machine cover is hinged to the frame body and can rotate at an angle greater than 90 degrees, and maintains the open state under the action of its own gravity and the gravity of the left pressure roller and the right pressure roller.

[0015] Preferably, the pressing component further includes two groups of guiding rods with limits and a pressing shaft bracket. Each group of guiding rods has no less than one and is fixedly arranged inside the machine cover. The two groups of pressing shaft brackets are movably sleeved on the guiding rods to move linearly along the axial direction of the guiding rods. The left pressing shaft and the right pressing shaft are respectively movably arranged on the two groups of pressing shaft brackets. The two groups of pressing shaft brackets are symmetrically arranged relative to the paper feeding slot, so that the left pressing shaft and the right pressing shaft descend to the same position under the action of their own gravity;

[0016] A paper shredder adopts the above-mentioned pressing cover for a paper shredder.

[0017] Compared with the prior art, the beneficial effects of the present utility model are:

[0018] Through the setting of the position of the pressing component, it is convenient to put a lot of papers at one time without the need to put papers multiple times. The upper paper feeding slot is suitable for putting single sheets of paper, and it is convenient to directly place large-sized papers into the inner housing;

[0019] Through the setting of the two groups of pressing shafts, shredding of large-sized papers is smoother and more stable, and it is not easy to jam;

[0020] Through the setting of the wedge-shaped lock, even if multiple papers are put in at one time, the machine cover will not be pushed open and cause the machine to stop;

[0021] Through the setting of the paper feeding slot, the versatility of the paper shredder is improved. For single sheets of paper, shredding can be carried out without opening the cover, and for multiple sheets of paper or large-sized papers, shredding can be carried out with the cover open. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following further details the present utility model with reference to the accompanying drawings of the specification:

[0023] Figure 1 It is the front view of the closed state of the machine cover in the first embodiment of the present utility model;

[0024] Figure 2 is Figure 1 The schematic structural diagram of the cross-section in the A-A direction in;

[0025] Figure 3 It is the three-dimensional structural diagram of the open state of the machine cover in the first embodiment of the present utility model;

[0026] Figure 4 is Figure 3 The partial enlarged schematic diagram of the B area in;

[0027] Figure 5 is Figure 2 The partial enlarged schematic diagram of the C area in;

[0028] Figure 6 It is the front view of the closed state of the machine cover in the second embodiment of the present utility model;

[0029] Figure 7 is Figure 6 a schematic structural diagram of the cross-section in the D-D direction in

[0030] Figure 8 a three-dimensional structural schematic diagram of the open state of the engine cover in the second embodiment of the present utility model;

[0031] Figure 9 is Figure 8 a partially enlarged schematic diagram of area E in

[0032] Figure 10 is Figure 7 a partially enlarged schematic diagram of area F in

[0033] Figure 11 is Figure 6 a schematic structural diagram of the cross-section in the G-G direction in

[0034] Figure 12 is Figure 11 a partially enlarged schematic diagram of area H in

[0035] Figure 13 a top view of the wedge-shaped latch of the present utility model;

[0036] Figure 14 a three-dimensional structural schematic diagram of the wedge-shaped latch of the present utility model;

[0037] Figure 15 is Figure 13 a schematic structural diagram of the cross-section in the K-K direction in

[0038] In the figure: 10, housing; 11, snap groove; 12, slot; 13, energizing lever; 14, locking groove; 15, fixed groove plate; 16, slide plate; 17, support base; 18, articulated arm; 19, wedge-shaped pressing block; 110, button; 111, trapezoidal stop block; 112, guide post; 113, guide slide bar; 114, return spring; 115, guide groove; 116, through groove; 117, chute; 118, wedge-shaped inclined plane; 119, sliding buckle inclined plane; 120, button groove; 121, limit boss; 20, machine cover; 21, bolt; 22, plug rod; 23, paper feed slot; 24, first proximity switch; 25, locking insert; 26, pivot hole seat; 27, insert hole; 30, inner housing; 31, side plate; 32, inclined support plate; 33, baffle; 34, paper placing cavity; 35, paper shredding cavity; 36, chute; 361, inclined chute; 362, longitudinal chute; 37, second proximity switch; 40, left pressing shaft; 41, right pressing shaft; 42, pin; 43, guide rod; 44, guide hole; 45, spring; 46, pressing shaft bracket; 47, bracket pin hole; 48, gasket; 49, round head screw; 410, connecting rod; 411, long slot; 412, pivot shaft; 413, pressing shaft seat; 414, connecting column; 50, left cutter shaft; 51, right cutter shaft; 52, annular blade; 53, cutter tip. Detailed implementation manner

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0040] Please refer to Figures 1 - 15 A pressure cover for a paper shredder, comprising a housing 10, a machine cover 20, an inner housing 30, and a downward pressing assembly; a rotatable left cutter shaft 50 and a right cutter shaft 51 are arranged below the inner housing 30, and multiple groups of annular blades 52 with cutter tips 53 are sleeved on the left cutter shaft 50 and the right cutter shaft 51; the housing 10 is a rectangular housing, and snap grooves 11 are arranged on all four sides to enable the machine cover 20 to be snapped into the housing 10 in the closed state; the machine cover 20 is hinged to the housing 10 through two groups of bolts 21 to facilitate the opening and closing of the machine cover 20.

[0041] Please refer to Figure 3 、 Figure 12A plug rod 22 is provided on the machine cover 20. A slot 12 is formed in the fastening groove 11 on the side of the frame 10 away from the bolt 21. An energized lever 13 is arranged in the slot 12. When the machine cover 20 is closed, the plug rod 22 is inserted into the slot 12 and impacts the energized lever 13 to provide an energized signal to control the rotation of the shredder motor. When the machine cover 20 is opened, the plug rod 22 disengages from the energized lever 13 and the shredder motor stops rotating.

[0042] Please refer to Figure 4 A paper feed slot 23 is formed at the top of the machine cover 20 for shredding paper without opening the cover. Two groups of first proximity switches 24 are arranged on both sides of the paper feed slot 23 for detecting paper feed signals and controlling the start and stop of the shredder motor.

[0043] Please refer to Figure 2 The inner housing 30 includes side plates 31, inclined support plates 32, and baffle plates 33. The inner housing 30 is arranged in a funnel shape, its top is fixedly connected to the frame 10, and both the upper and lower ends are open. The side plates 31 on the left and right sides and the inclined support plates 32 at the front and rear ends form a paper placement cavity. Baffle plates 34 are respectively arranged at the lower ends of the two groups of inclined support plates 32. A shredding cavity is formed between the two groups of baffle plates 34. The core composed of the left cutter shaft 50, the right cutter shaft 51, the annular blade 52, and the cutter tip 53 is arranged in the shredding cavity, so that the paper in the paper placement cavity is shredded by the core in the shredding cavity.

[0044] Please refer to Figure 5 The pressing component includes a left pressing shaft 40 and a right pressing shaft 41 symmetrically arranged above the left cutter shaft 50 and the right cutter shaft 51. The axes of the left pressing shaft 40 and the right pressing shaft 41 are in the same direction as the axes of the left cutter shaft 50 and the right cutter shaft 51.

[0045] Please refer to Figure 2 A paper feed slot 23 is arranged directly above the left pressing shaft 40 and the right pressing shaft 41. The paper feed slot 23 is fixedly arranged on the machine cover 20, so that the paper fed through the paper feed slot 23 can smoothly enter between the left cutter shaft 50 and the right cutter shaft 51. The center lines of the radial cross-sections of the left pressing shaft 40 and the right pressing shaft 41, the center lines of the radial cross-sections of the left cutter shaft 50 and the right cutter shaft 51, and the center line of the vertical cross-section of the paper feed slot 23 along the axis of the left pressing shaft 40 are collinear.

[0046] Please refer to Figure 5 When the pressing component descends to the limit position, the left pressing shaft 40 is tangent to the cutter tip 53 on the annular blade 52 of the left cutter shaft 50, and the right pressing shaft 41 is tangent to the cutter tip 53 on the annular blade 52 of the right cutter shaft 51, which is used to avoid over-cutting and collision between the left pressing shaft 40, the right pressing shaft 41 and the cutter tip 53. Through the setting of the two groups of pressing shafts, the shredding of large-sized paper is more smooth and stable, and it is not easy to jam.

[0047] Please refer to Figure 4 The pressing component further includes a connecting rod 410, a long slot 411, a pivot shaft 412, a pressing shaft seat 413, and a connecting column 414. The two shaft ends of the left pressing shaft 40 and the right pressing shaft 41 are movably arranged on the pressing shaft seat 413, so that the left pressing shaft 40 and the right pressing shaft 41 can rotate on the pressing shaft seat 413. The pressing shaft seat 413 is slidably arranged in the long slot 411 formed on the connecting rod 410 through the fixedly arranged connecting column 414;

[0048] Please refer to Figure 2 The connecting rod 410 is L-shaped. When the machine cover 20 is in the closed state, the long slot 411 on the connecting rod 410 is vertically arranged relative to the machine cover 20, so that the left pressing shaft 40 and the right pressing shaft 41 can move up and down in the shredding working state;

[0049] Please refer to Figure 5 The pressing shaft seat 413 is an isosceles triangle, and the left pressing shaft 40 and the right pressing shaft 41 are symmetrically arranged on the pressing shaft seat 413; so that the left pressing shaft 40 and the right pressing shaft 41 descend to the same position under the action of their own gravity;

[0050] Please refer to Figure 4 Two groups of pivot hole seats 26 are fixedly arranged on the inner side of the machine cover 20, and the two groups of connecting rods 410 are hinged to the pivot hole seats 26; a chute 36 is formed on the side plate 31, and the connecting column 414 is slidably arranged in the chute 36;

[0051] Please refer to Figure 2The chute 36 is composed of an inclined slot 361 and a longitudinal slot 362. The inclined slot 361 is inclined relative to the horizontal plane and is used to limit the running track of the connecting column 414. The longitudinal slot 362 is arranged perpendicular to the horizontal plane and is used to limit the extreme position where the downward pressing assembly is symmetrically arranged above the left cutter shaft 50 and the right cutter shaft 51, and to ensure that the downward pressing assembly moves vertically up and down. During use, when the machine cover 20 is closed, driven by the hinge rotation of the connecting rod 410 and the pivot hole seat 26, the connecting rod 410 pushes the connecting column 414 slidably arranged in the long hole 411 to drive the left pressing shaft 40 and the right pressing shaft 41 to move downward along the inclined slot 361 and the longitudinal slot 362 to the lowest position, and the machine cover 20 is completely closed. The left pressing shaft 40 and the right pressing shaft 41 are supported by the paper. During the process of closing the machine cover 20, the connecting column 414 slides upward along the long hole 411. When there is paper in the inner housing 30 for shredding, the connecting column 414 gradually moves downward along the long hole 411 until the lowest position is the extreme position. At this time, the paper is cleared. The left pressing shaft 40 is tangent to the tip 53 of the annular blade 52 on the left cutter shaft 50, and the right pressing shaft 41 is tangent to the tip 53 of the annular blade 52 on the right cutter shaft 51.

[0052] Please refer to Figure 13 The gland for the shredder further includes a wedge-shaped lock for restricting the upward opening of the machine cover 20 caused by the reverse thrust of the cutter shaft rotation on the paper. The wedge-shaped lock includes a fixed groove plate 15, a trapezoidal stop block 111, and a guiding slide rod 113. Multiple groups of the guiding slide rods are provided and are slidably arranged on the fixed groove plate 15. One end of the guiding slide rod 113 is fixedly connected to the trapezoidal stop block 111. A lock insert 25 is arranged on the machine cover 20, and an insert hole 27 is opened on the insert 25 so that when the machine cover 20 is in a closed state, the trapezoidal stop block 111 can be inserted into the insert hole 27 to lock the machine.

[0053] Please refer to Figure 14The wedge-shaped latch further includes a sliding plate 16, a support base 17, a hinge arm 18, a wedge-shaped pressing block 19, a button 110, a guide post 112, and a return spring 114; the fixed groove plate 15 is fixedly arranged on the frame 10, the support base 17 is fixedly arranged on the fixed groove plate 15, two groups of the trapezoidal stoppers 111 are fixedly arranged on the sliding plate 16 through a plurality of groups of the guide posts 112, a plurality of groups of guide grooves 115 are formed on the fixed groove plate 15, the guide posts 112 are movably arranged in the guide grooves 115 for linear motion, and the trapezoidal stoppers 111 move linearly along the guide grooves 115 through the guide posts 112 and are movably arranged on the fixed groove plate 15; two groups of hinge arms 18 are fixedly arranged on the fixed groove plate 15, the wedge-shaped pressing block 19 is hinged to the hinge arm 18 so that the wedge-shaped pressing block 19 rotates and presses down along the hinge arm 18; a return spring 114 is sleeved on the guide slide bar 113 and is arranged between the trapezoidal stopper 111 and the fixed groove plate 15; and it is used to push the trapezoidal stopper 111 to move linearly.

[0054] Please refer to Figure 15 The wedge-shaped pressing block 19 is provided with a wedge-shaped inclined surface 118, a through groove 116 is formed on the fixed groove plate 15 at a position corresponding to the wedge-shaped inclined surface 118, a sliding groove 117 is formed on the sliding plate 16 at a position corresponding to the through groove 116, under the action of the spring elastic force, the sliding groove 117 is closer to the wedge-shaped inclined surface 118 than the through groove 116, so that when the wedge-shaped pressing block 19 rotates and presses down along the hinge arm 18, it pushes the sliding groove 117 to move, and the trapezoidal stopper 111 is provided with the sliding buckle inclined surface 119 for restricting the running track of the insert piece 25.

[0055] Please refer to Figure 14A button slot 120 is provided on the upper side of the fixed slot plate 15. The button slot 120 is disposed directly above the wedge-shaped pressing block 19. The button 110 is movably disposed within the button slot 120. A limiting boss 121 is provided on the button 110 to limit the upper movement limit of the button 110 within the button slot 120. During use, when closing the machine cover 20, the lock catch insert 25 moves downward along the sliding catch inclined surface 119, and the trapezoidal stop block 111 is squeezed backward to overcome the elastic force of the return spring 114 and linearly move backward along the guiding slot 115. When the machine cover 20 is completely closed, the lock catch insert 25 moves to the lowest position below the sliding catch inclined surface 119, and the trapezoidal stop block 111 moves linearly forward along the guiding slot 115 under the action of the spring elastic force and enters the insert hole 27 to complete the locking action. When it is necessary to open the machine cover 20, press the button 110. The button 110 presses the wedge-shaped pressing block 19 downward to rotate along the hinge arm 18, driving the wedge-shaped inclined surface 118 to rotate along the hinge arm 18. After passing through the through slot 116, it contacts the sliding slot 117, pushing the sliding plate 16 to move backward. The sliding plate 16 drives the trapezoidal stop block 111 to move backward along the guiding slot 115 through the guiding column 112 to leave the insert hole 27 to complete the unlocking.

[0056] Please refer to Figure 1 A second proximity switch 37 for sensing whether there is paper in the inner housing 30 is fixedly provided on the inner housing 30 to control the start and stop of the shredding motor. During use, when there is paper in the inner housing 30, the second proximity switch 37 is powered on and the shredding motor starts. When there is no paper in the inner housing 30, the second proximity switch 37 is powered off and the shredding motor stops.

[0057] Please refer to Figure 3 The machine cover 20 rotates around the insertion pin 21 on the frame 10 by an angle greater than 90 degrees and maintains the open state under the action of its own gravity and the gravity of the left pressing shaft 40 and the right pressing shaft 41. In addition, after more than 90 degrees, the pressing component moves away from the inner housing 30, facilitating the placement of a large number of sheets of paper at one time without the need to place paper again. The upper paper feeding slot is suitable for placing single sheets of paper and facilitates the direct placement of large sheets of paper into the inner housing 30. Embodiment 2

[0058] Please refer to Figures 6 - 10This is the second embodiment of the present utility model. Different from the first embodiment, in this embodiment: the pressing component further includes two groups of guiding rods 43 with limits and a pressing shaft bracket 46. Each group of guiding rods has not less than one and is fixedly arranged inside the machine cover 20. The two groups of pressing shaft brackets 46 are movably sleeved on the guiding rods 43 so as to move linearly along the axial direction of the guiding rods 43. The left pressing shaft 40 and the right pressing shaft 41 are respectively movably arranged on the two groups of pressing shaft brackets 46. The two groups of pressing shaft brackets 46 are symmetrically arranged relative to the paper feeding slot 23 so that the left pressing shaft 40 and the right pressing shaft 41 descend to the same position under the action of their own gravity.

[0059] Please refer to Figure 9 The pressing component further includes a spring 45, a gasket 48, and a round head screw 49. The two arm ends of the pressing shaft bracket 46 are provided with bracket pin holes 47. The two shaft ends of the left pressing shaft 40 and the right pressing shaft 41 are respectively fixedly provided with pin posts 42. The left pressing shaft 40 and the right pressing shaft 41 are movably arranged on the pressing shaft bracket 46 through the cooperation of the pin posts 42 and the bracket pin holes 47 and rotate axially along the bracket pin holes 47. The bottom plate of the pressing shaft bracket 46 is provided with a guiding hole 44 for cooperating with the guiding rod 43. The pressing shaft bracket 46 is movably sleeved on the guiding rod 43 through the guiding hole 44 so that the pressing shaft bracket 46 moves linearly along the guiding rod 43. A spring 45 is sleeved on each group of guiding rods 43 and is arranged between the machine cover 20 and the pressing shaft bracket 46 so that when the left pressing shaft 40 and the right pressing shaft 41 move upward, the spring elastic force is borne and converted into paper pressure. A gasket 48 fixed by the round head screw 49 is fixedly arranged on the outer side of one end of the guiding rod 43 close to the pressing shaft bracket 46. The gasket 48 limits the extreme position of the downward movement of the pressing shaft bracket 46, that is, limits the downward movement of the left pressing shaft 40 and the right pressing shaft 41 to the extreme position. During use, when the machine cover 20 is closed, the left pressing shaft 40 and the right pressing shaft 41 move downward along the axial direction of the guiding rod 43 under the action of their own gravity to the lowest position, and the machine cover 20 is completely closed. The left pressing shaft 40 and the right pressing shaft 41 are supported by the paper. During the process of closing the machine cover 20, the pressing shaft bracket 46 drives the left pressing shaft 40 and the right pressing shaft 41 to move upward along the axial direction of the guiding rod 43 against the elastic force of the spring 45. The maximum compression force borne by the spring 45 is less than the sum of the self-gravity of the machine cover 20 and the friction force between the machine cover 20 and the buckling groove 11. When there is paper in the inner housing 30 for shredding, the pressing shaft bracket 46 moves downward along the axial direction of the guiding rod 43 until the lowest position is the extreme position. At this time, the paper is cleared. The left pressing shaft 40 is tangent to the tip 53 of the annular blade 52 on the left cutter shaft 50, and the right pressing shaft 41 is tangent to the tip 53 of the annular blade 52 on the right cutter shaft 51.

[0060] Obviously, the above embodiments are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And these obvious changes or modifications derived from the spirit of the present utility model are still within the protection scope of the present utility model.

Claims

1. A gland for a paper shredder, characterized in that: The invention comprises a frame (10), a cover (20), an inner shell (30), and a pressing assembly; a left knife shaft (50) and a right knife shaft (51) are rotatably arranged below the inner shell (30); a plurality of groups of annular blades (52) with knife tips (53) are sleeved on the left knife shaft (50) and the right knife shaft (51); a paper feed slot (23) is provided on the top of the cover (20) for shredding paper without opening the cover; the pressing assembly comprises a left pressing shaft (40) and a right pressing shaft (51) symmetrically arranged above the left knife shaft (50) and the right knife shaft (51). The left pressure shaft (40) and the right pressure shaft (41) have axes in the same direction as the axes of the left knife shaft (50) and the right knife shaft (51); when the pressing assembly descends to the limit position, the left pressure shaft (40) is tangent to the tip (53) of the annular blade (52) on the left knife shaft (50), and the right pressure shaft (41) is tangent to the tip (53) of the annular blade (52) on the right knife shaft (51); and the left pressure shaft (40) and the right pressure shaft (41) are used to avoid overcutting and collision with the tip (53).

2. A cover for a shredder according to claim 1, characterized in that: The paper feed slot (23) is arranged just above the left pressure shaft (40) and the right pressure shaft (41), so that the paper fed through the paper feed slot (23) can smoothly enter between the left knife shaft (50) and the right knife shaft (51), and the radial cross-section centerline of the left pressure shaft (40) and the right pressure shaft (41) is collinear with the radial cross-section centerline of the left knife shaft (50) and the right knife shaft (51) and the cross-section centerline of the paper feed slot (23) along the axis of the left pressure shaft (40) vertically. First proximity switches (24) are arranged on both sides of the paper feed slot (23) for detecting a paper feed signal and controlling the start and stop of a paper shredding motor.

3. A cover for a shredder according to claim 2, characterized in that: The pressing assembly further comprises a connecting rod (410), an elongated hole (411), a pressure bearing seat (413), and a connecting column (414). The two ends of the left pressure bearing (40) and the right pressure bearing (41) are movably arranged on the pressure bearing seat (413) so that the left pressure bearing (40) and the right pressure bearing (41) can rotate on the pressure bearing seat (413). The pressure bearing seat (413) is slidably arranged in the elongated hole (411) opened on the connecting rod (410) via a fixedly arranged connecting column (414).

4. A cover for a shredder according to claim 3, characterized in that: The connecting rod (410) is L-shaped, and when the cover (20) is in a closed state, the long hole (411) on the connecting rod (410) is arranged vertically relative to the cover (20), so that the left pressing shaft (40) and the right pressing shaft (41) can move up and down in a paper shredding working state.

5. A cover for a shredder according to claim 4, characterized in that: The pressure bearing seat (413) is an isosceles triangle, and the left pressure bearing (40) and the right pressure bearing (41) are symmetrically arranged on the pressure bearing seat (413), so that the left pressure bearing (40) and the right pressure bearing (41) fall to the same position under the action of their own gravity.

6. A cover for a shredder according to claim 5, characterized in that: The inner shell (30) is provided with sliding grooves (36) on both sides of the shaft ends near the left knife shaft (50) and the right knife shaft (51), and the connecting column (414) is slidably set in the sliding groove (36); the sliding groove (36) is composed of an inclined groove (361) and a longitudinal groove (362), and the inclined groove (361) is inclined relative to the horizontal plane, and is used to limit the running trajectory of the connecting column (414); the longitudinal groove (362) is arranged vertically relative to the horizontal plane, and is used to limit the limit position of the pressing component symmetrically arranged above the left knife shaft (50) and the right knife shaft (51), so that the pressing component moves vertically up and down.

7. A cover for a shredder according to claim 2, characterized in that: The pressing assembly further comprises two groups of guide rods (43) with limiting positions and pressure shaft brackets (46), each group of the guide rods comprising at least one guide rod fixedly arranged on the inner side of the machine cover (20), the two groups of pressure shaft brackets (46) being movably sleeved on the guide rods (43) so as to enable linear movement along the axial direction of the guide rods (43), the left pressure shaft (40) and the right pressure shaft (41) being movably arranged on the two groups of pressure shaft brackets (46), respectively, the two groups of pressure shaft brackets (46) being symmetrically arranged relative to the paper feed slot (23), so as to enable the left pressure shaft (40) and the right pressure shaft (41) to descend to the same position under the action of their own gravity.

8. A cover for a shredder according to any one of claims 1 to 7, characterized in that: The press cover for the shredder further comprises a wedge-shaped lock catch for limiting the upward opening of the machine cover (20) caused by the reverse thrust of the knife shaft on the paper when the knife shaft rotates; the wedge-shaped lock catch comprises a fixed slot plate (15), a trapezoidal stopper (111), and a guide slide bar (113); the guide slide bar is provided with a plurality of groups and is slidably arranged on the fixed slot plate (15); one end of the guide slide bar (113) is fixedly connected to the trapezoidal stopper (111); the machine cover (20) is provided with a lock catch insert (25), and the insert plate (25) is provided with an insert plate hole (27), so that when the machine cover (20) is in a closed state, the trapezoidal stopper (111) can be inserted into the insert plate hole (27) to lock the machine.

9. A cover for a shredder according to claim 8, characterized in that: The cover (20) is hinged to the frame (10) with a rotation angle greater than 90 degrees; the cover is maintained in an open state under the action of its own gravity and the gravity of the left pressure shaft (40) and the right pressure shaft (41).

10. A paper shredder, characterized in that: A press cover for a paper shredder is used according to claim 8.

Images