A paper shredder with an improved automatic paper feed device and a paper feed method for the paper shredder

Abstract

The application discloses a shredder with improved automatic paper feeding device, and the shredder head is provided with a vertical paper feeding channel and an automatic side paper feeding channel, the automatic side paper feeding channel is provided with a paper rolling mechanism and a paper pressing mechanism, the paper rolling mechanism is provided with an upper paper rolling roller and a lower paper rolling roller, and the middle or lower part of the paper to be shredded is folded and rolled into a paper rolling gap when the paper rolling mechanism rolls paper. The application also discloses a paper feeding method of the shredder, which comprises a paper placing step, a paper pressing step, a paper folding and rolling step, a paper guiding step and a paper shredding step, so that the paper to be shredded which is placed obliquely is folded and moved towards the paper shredding cutter, the paper feeding stroke of the paper to be shredded is shortened, interference with the paper to be shredded which is vertically inserted is avoided, the paper feeding efficiency is improved, and the function of queuing for shredding is realized. The paper to be shredded is folded when feeding, the paper feeding stroke of the paper to be shredded is shortened, two adjacent papers to be shredded are overlapped, the paper feeding efficiency is improved, the automatic side paper feeding channel and the vertical paper feeding channel do not interfere with each other, and the function of queuing for shredding can be realized.

Description

Technical Field

[0001] This invention relates to the field of paper shredder technology, and in particular to a paper shredder with an improved automatic paper feeding device and a paper feeding method for the paper shredder. Background Technology

[0002] To facilitate large-volume shredding, paper shredders are often equipped with automatic paper feeding devices. Existing automatic paper feeding devices on paper shredders fall into two categories. The first type places the paper at an angle above the shredder blades, feeding each sheet into the blades one by one via rubber rollers. The second type places the paper horizontally above the shredder blades, with two opposing rotating rubber rollers positioned between the paper and the blades. These rollers fold the paper from the middle and roll it downwards into the blades. The first type of automatic paper feeding device requires feeding paper one sheet at a time, and paper jams are prone to occur between the single rubber roller and the paper, resulting in slow feeding speeds and frequent jams. While the second type of automatic paper feeding device accelerates feeding speed by folding the paper, the horizontal placement of the paper directly above the shredder blades means the shredder has only one feeding channel. This prevents simultaneous shredding of individual sheets during batch processing, and requires removing stacks of paper to be shredded when interrupted, making it inconvenient to use. Therefore, improvements are necessary. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide an improved automatic paper feeding device for a paper shredder and a paper feeding method for the shredder, thereby improving paper feeding efficiency, reducing paper jams, enhancing safety, and enabling simultaneous single-sheet shredding while performing continuous shredding, thus improving ease of use and facilitating cleanup.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an improved automatic paper feeding device for a paper shredder, comprising a shredder head, a shredder core, and a control circuit. The shredder core and the control circuit are respectively disposed within the shredder head. The shredder core is provided with shredder blades and a shredder drive mechanism. The shredder drive mechanism is drively connected to the shredder blades. The control circuit is electrically connected to the shredder drive mechanism. The upper part of the shredder head is provided with a manual paper feed inlet and an automatic paper feed compartment, which are spaced apart. The upper part of the shredder blades is provided with a shredding inlet, which is located below the manual paper feed inlet. The manual paper feed inlet is vertically connected to the shredding inlet through a vertical paper feed channel. The automatic paper feed compartment is provided with an automatic side paper feed channel, which is inclinedly disposed beside the shredder blades. The lower end of the automatic side paper feed channel is lower than the top of the shredding inlet. A horizontal paper feed channel is provided between the automatic side paper feed channel and the shredding inlet. A paper winding mechanism is provided on the side of the horizontal paper feed channel adjacent to the automatic side paper feed channel.

[0005] The paper winding mechanism includes an upper paper feed roller and a lower paper feed roller, which are arranged from top to bottom along the inclined direction of the automatic side feed channel. There is a paper winding gap between the upper and lower paper feed rollers. The upper and lower paper feed rollers rotate in opposite directions. The lower paper feed roller has a paper feeding point E for paper feeding. Along the parallel direction of the automatic side feed channel, the paper feeding point E is higher than the lower end of the automatic side feed channel. When the paper winding mechanism feeds the paper, the middle or lower part of the paper to be shredded is folded and wound into the paper winding gap.

[0006] The automatic side paper feed channel is equipped with a paper pressing mechanism, which is located on the opposite side of the paper winding mechanism.

[0007] In a further technical solution, the paper pressing mechanism includes a paper feeding detection component, a paper pressing drive component, a paper pressing plate, and a paper pressing elastic element. The paper feeding detection component is located on one side of the automatic side paper feeding channel. The paper feeding detection component and the paper pressing drive component are electrically connected to the control circuit. The paper pressing plate is located on one side of the automatic side paper feeding channel along the inclined direction of the automatic side paper feeding channel. The paper pressing plate is slidably installed on the shredder core and extends into the automatic side paper feeding channel from the outside. The paper pressing drive component is connected to the paper pressing plate for transmission. The paper pressing plate moves towards and away from the paper winding mechanism. The paper pressing elastic element is located between the paper pressing plate and the paper winding core to realize the reset of the paper pressing plate towards the paper winding mechanism. The distance between the paper feeding point E and the lower end of the automatic side paper feeding channel is set as D. After the paper to be shredded is folded, a folded part is formed on one side of the paper to be shredded. The length of the folded part is set as L. The radius of the lower paper feeding roller is set as R. D = L + R + compensation coefficient H. The compensation coefficient H is 0.3-0.8cm, and L is 2-10cm.

[0008] In a further technical solution, the paper feed detection component includes a light control sensor, which is located at the bottom of the automatic side paper feed channel and electrically connected to the control circuit.

[0009] The paper pressing drive assembly includes a paper pressing drive motor, a paper pressing shaft, a paper pressing drive cam, a paper pressing trigger cam, and a paper pressing trigger switch. The paper pressing drive motor is fixedly installed in the shredder core, and the paper pressing shaft is rotatably installed in the shredder core. The paper pressing drive motor is connected to the paper pressing shaft for transmission. The paper pressing drive cam and the paper pressing trigger cam are respectively fixedly installed in the paper pressing shaft. The paper pressing trigger switch is electrically connected to the control circuit and is triggered by the paper pressing trigger cam. A drive connection seat and multiple sliding pillars are provided on the side of the pressing plate away from the automatic side paper feeding channel. Each sliding pillar is slidably installed in the shredder core. Each sliding pillar is fitted with a paper pressing elastic element. The drive connection seat has a sliding groove that is slidably engaged with the paper pressing shaft. The paper pressing trigger cam is abutted against the drive connection seat.

[0010] When the light sensor does not detect the paper to be shredded, the flange of the paper pressing drive cam abuts against the drive connector, the paper pressing trigger cam abuts against the paper pressing trigger switch, and the paper pressing board exits the automatic side paper feeding channel;

[0011] When the light sensor detects the paper to be shredded, the paper pressing drive cam separates from the drive connector, the paper pressing trigger cam separates from the paper pressing trigger switch, and the paper pressing plate extends into the automatic side paper feeding channel and presses against the paper to be shredded.

[0012] The pressure plate is rotatably mounted with at least two paper feed shafts on the side facing the paper winding mechanism. The two paper feed shafts are respectively located on the sides of the upper paper feed roller and the lower paper feed roller.

[0013] In a further technical solution, the shredding drive mechanism includes a shredding drive motor and a shredding drive gear set. The shredding drive motor is fixedly installed on the shredder core, and the shredding drive motor is connected to the shredding drive gear set for transmission. The same end of the upper paper feeding roller and the lower paper feeding roller are respectively provided with an upper paper feeding transmission gear and a lower paper feeding transmission gear, which mesh with each other. The shredding drive gear set meshes with the lower paper feeding transmission gear.

[0014] The upper part of the paper shredder is equipped with an arc-shaped lower guide plate, one side of which extends to the middle of the shredding inlet. A paper guiding mechanism is provided between the paper winding mechanism and the shredding inlet, and a transverse paper feeding channel is formed between the paper guiding mechanism and the lower guide plate.

[0015] In a further technical solution, the paper guiding mechanism includes at least one paper guiding roller, which is rotatably mounted on the shredder core. The paper guiding roller is located on the side of the upper paper feeding roller facing the shredder blade, and the lower part of the paper guiding roller rotates on the side facing the shredder blade. One end of the paper guiding roller is provided with a paper guiding drive gear, which meshes with the lower paper feeding drive gear.

[0016] In a further technical solution, the paper guiding mechanism includes a paper guiding housing, which is fixedly installed on the paper shredder core. The paper guiding housing is provided with at least one paper guiding arc surface, one end of which extends above the paper roll gap and the other end extends above the shredding inlet.

[0017] In a further technical solution, a paper feeding mounting slot is provided on the upper part of the shredder head. A paper feeding base plate and a paper feeding flap are provided in the paper feeding mounting slot. The paper feeding base plate is movably installed above the shredder core. A locking component is provided at the rear of the paper feeding base plate. The locking component locks with the shredder head. A vertical paper feeding channel is opened at the front of the paper feeding base plate. The lower part of the paper feeding flap is hinged to the rear side of the paper feeding mounting slot. A paper tray with openings at the top and bottom is provided on the front side of the paper feeding flap. When automatic paper feeding is performed, the lower part of the paper tray is aligned with and connected to the automatic side paper feeding channel. When the automatic paper feeding function is not used, the paper feeding flap covers the rear of the paper feeding mounting slot and seals the automatic side paper feeding channel.

[0018] A paper feeding method for a paper shredder includes the following steps:

[0019] The paper-laying process includes the following sub-steps:

[0020] The automatic paper shredder feeds paper through an automatic paper feed compartment located on one side of the manual paper feed inlet. The lower end of the automatic paper feed channel is horizontally offset from the shredding inlet. Multiple sheets of paper to be shredded are stacked in the automatic paper feed channel, forming a paper pile. The lower end of the paper pile is located below the shredding inlet of the shredding blade.

[0021] The manual paper feeding process involves inserting the paper to be shredded into the manual paper inlet located on the shredder head, and guiding the paper to the shredding inlet located above the shredder blades through the vertical paper feeding channel.

[0022] In the paper pressing step, after the paper feed sensor detects that a paper stack has entered, the paper pressing drive mechanism drives the paper pressing mechanism to move toward the paper stack and keep the paper stack pressed tightly on the paper winding mechanism;

[0023] In the folding paper roll step, the upper paper feed roller of the paper roll mechanism rotates in the forward direction, and the lower paper feed roller of the paper roll mechanism rotates in the reverse direction. The lower part of the upper paper feed roller and the upper part of the lower paper feed roller both rotate from one side of the paper stack toward the side of the shredder. The lower paper feed roller has a paper feed point E for paper feed. The paper feed point E is higher than the lower end of the automatic side paper feed channel in the direction parallel to the automatic side paper feed channel. The paper roll mechanism folds the middle and lower part of the paper to be shredded in the automatic side paper feed channel, forming a folded part in the lower part of the paper to be shredded. The folded paper to be shredded is rolled into the horizontal paper feed channel. Two adjacent papers to be shredded partially overlap after entering the horizontal paper feed channel. The maximum number of overlapping papers to be shredded in the horizontal paper feed channel is more than 3.

[0024] In the paper guiding step, the paper to be shredded, which is folded and overlapped by the paper roll mechanism, is guided to the shredding inlet through the transverse paper feeding channel set between the automatic side paper feeding channel and the shredding inlet.

[0025] In the paper shredding step, the paper shredder is driven to rotate by the paper shredding drive mechanism, which shreds the paper to be shredded from the shredding inlet into paper scraps.

[0026] In a further technical solution, during the folding and rolling step, after the rolling mechanism folds and rolls in the first sheet of paper to be shredded, the first sheet of paper to be shredded is first separated from the lower paper feed roller, the upper paper feed roller remains in contact with the first sheet of paper to be shredded, and the lower paper feed roller rubs the second sheet of paper to be shredded. The front end of the folded portion of the second sheet of paper to be shredded is adjacent to or abuts against the end of the folded portion of the first sheet of paper to be shredded, so that the second sheet of paper to be shredded and the first sheet of paper to be shredded partially overlap as they enter the transverse paper feed channel. The lower paper feed roller separates from the second sheet of paper to be shredded again, and the lower paper feed roller rubs the third sheet of paper to be shredded. The front end of the folded portion of the third sheet of paper to be shredded is adjacent to or abuts against the end of the folded portion of the second sheet of paper to be shredded, and so on, continuously overlapping the paper feed. The transverse paper feed channel is blocked on the paper feed side by the upper and lower paper feed rollers.

[0027] Both the upper and lower paper feed rollers are located between the middle and lower ends of the paper stack. The distance between the paper feed point E and the lower end of the paper stack is set as D, the length of the folded part is set as L, and the radius of the lower paper feed roller is set as R. D = L + R + compensation coefficient H, the compensation coefficient H is 0.3-0.8cm, L is 2-10cm, and the maximum number of overlapping sheets is 3 to 15 sheets.

[0028] In a further technical solution, during the paper pressing step, when the paper feed sensor detects that there is no paper stack in the automatic side paper feed channel, the paper pressing drive mechanism drives the paper pressing mechanism to move away from the paper winding mechanism, so that the paper pressing mechanism moves out of the automatic side paper feed channel, and then the paper feeding step is repeated.

[0029] During the shredding process, the shredder simultaneously shreds the paper to be shredded in both the vertical feed channel and the automatic side feed channel.

[0030] In the paper guiding step, the folded and overlapping paper to be shredded passes through the paper winding mechanism and then abuts against the paper guiding mechanism in the horizontal paper feeding channel. The paper to be shredded moves towards the shredding inlet of the paper shredder along the guiding direction of the paper guiding mechanism.

[0031] The advantages of this invention compared to existing technologies using the above structure are as follows: The paper to be shredded in the automatic side feed channel is wound into the paper roll gap between the upper and lower paper feed rollers from the side, and folded simultaneously during winding, thereby shortening the paper feed stroke and accelerating the feeding speed. The paper is then guided to the shredding inlet of the shredder by the paper guiding mechanism, ensuring the automatic side feed channel is located beside the shredder and the shredding inlet is not exposed within the automatic side feed channel, thus improving safety. The paper roll mechanism is located at the lower part of the paper to be shredded. During feeding, the paper is folded from the middle to the lower end and wound into the paper roll gap. After the folded portion of the paper separates from the lower paper feed roller, the next sheet of paper to be shredded is fed by the lower paper feed roller. The rollers are wound into the gap between the paper rolls, thus creating an overlap between two adjacent sheets of paper to be shredded during feeding, further improving feeding efficiency. The paper feeding detection component detects whether there is paper to be shredded in the automatic side feeding channel, thereby controlling the paper pressing drive component to drive the pressure plate to move, so that the paper to be shredded is pressed against the paper roll mechanism during feeding and avoids the paper to be shredded during unloading, eliminating the need for manual operation and improving operational convenience. In case of paper jam, it is easy to remove the pressure plate out of the automatic side feeding channel for cleaning. When performing continuous shredding, single or small amounts of paper to be shredded are directly inserted into the shredding inlet through the vertical feeding channel, allowing paper to be fed simultaneously in the automatic side feeding channel and the vertical feeding channel, realizing the queue-jumping shredding function, further improving the convenience of use. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] Figure 1 This is a schematic diagram of the structure of the present invention;

[0034] Figure 2 This is a schematic diagram of the internal structure of the shredder head of the present invention;

[0035] Figure 3 This is a schematic diagram of the paper pressing mechanism when there is paper in the automatic side paper feed channel of the present invention;

[0036] Figure 4 This is a schematic diagram of the paper pressing mechanism of the automatic side paper feed channel of the present invention when there is no paper.

[0037] Figure 5 This is a schematic diagram of the continuous feeding state of the paper to be shredded after folding, according to the present invention.

[0038] Figure 6 This is a cross-sectional view of the paper guiding mechanism of the present invention using a paper guiding roller during continuous paper feeding;

[0039] Figure 7 This is the invention Figure 6 Enlarged view of part A;

[0040] Figure 8 This is a cross-sectional view of the paper guide mechanism of the present invention using the paper guide housing during continuous paper feeding;

[0041] Figure 9 This is the invention Figure 8 Enlarged view of part B.

[0042] In the picture:

[0043] 1 Shredder head, 11 Paper feed mounting slot, 12 Paper feed base plate, 13 Locking assembly, 14 Paper feed flap, 15 Paper tray;

[0044] 2. Shredder core; 21. Shredder blade; 211. Shredder inlet; 22. Lower guide plate;

[0045] 31 Vertical paper feed channel, 311 Manual paper feed inlet, 32 Automatic side paper feed channel;

[0046] 41 Shredder drive gear set;

[0047] 51 Upper paper feed roller, 511 Upper paper feed drive gear, 52 Lower paper feed roller, 521 Lower paper feed drive gear;

[0048] 6. Paper pressing mechanism, 61. Paper feeding detection component, 62. Paper pressing drive motor, 63. Paper feeding shaft, 64. Paper pressing drive cam, 65. Paper pressing trigger cam, 66. Paper pressing trigger switch, 67. Paper pressing plate, 671. Paper pressing shaft, 672. Drive connecting seat, 673. Slide groove, 674. Slide column, 68. Paper pressing elastic element;

[0049] 7. Paper guiding mechanism, 71. Paper guiding roller, 711. Paper guiding transmission gear, 72. Paper guiding housing, 721. Paper guiding arc surface;

[0050] 8 piles of paper, 81 pieces of paper to be shredded, 811 folding sections. Detailed Implementation

[0051] The following are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

[0052] A paper shredder with an improved automatic paper feeding device, such as Figures 1 to 9 As shown, the shredder includes a shredder head 1, a shredder core 2, and a control circuit. The shredder core 2 and the control circuit are respectively located inside the shredder head 1. The shredder core 2 is equipped with a shredder blade 21 and a shredder drive mechanism. The shredder drive mechanism is driven by the shredder blade 21. The control circuit is electrically connected to the shredder drive mechanism. The upper part of the shredder head 1 is provided with a manual paper inlet 311 and an automatic paper feed chamber, which are spaced apart. The upper part of the shredder blade 21 is provided with a shredding inlet 211, which is located below the manual paper inlet 311. The manual paper inlet 311 is vertically connected to the shredding inlet 211 through a vertical paper feed channel 31. The automatic paper feed chamber is provided with an automatic side paper feed channel 32, which is inclined to the side of the shredder blade 21. The lower end of the automatic side paper feed channel 32 is lower than the shredding inlet. At the top of the inlet 211, a transverse paper feed channel is provided between the automatic side paper feed channel 32 and the shredding inlet 211. A paper winding mechanism is provided on the side of the transverse paper feed channel adjacent to the automatic side paper feed channel 32. The paper winding mechanism is provided with an upper paper feeding roller 51 and a lower paper feeding roller 52. The upper paper feeding roller 51 and the lower paper feeding roller 52 are arranged from top to bottom along the inclined direction of the automatic side paper feed channel 32. There is a paper winding gap between the upper paper feeding roller 51 and the lower paper feeding roller 52. The rotation directions of the upper paper feeding roller 51 and the lower paper feeding roller 52 are opposite. The lower paper feeding roller 52 has a paper feeding point E for paper feeding. The paper feeding point E is higher than the lower end of the automatic side paper feed channel 32 in the direction parallel to the automatic side paper feed channel 32. When the paper winding mechanism feeds the paper, the middle or lower part of the paper to be shredded 81 is folded and wound into the paper winding gap. The automatic side paper feed channel 32 is provided with a paper pressing mechanism 6, which is located on the opposite side of the paper winding mechanism.

[0053] Traditional continuous feed shredders can only feed one sheet at a time when the paper is placed at an angle. The feeding stroke of the paper to be shredded 81 is the same as the total length of the paper to be shredded 81. Although shredders with horizontally placed paper can fold and roll the paper to be shredded 81 from the middle and into the shredding inlet 211, the paper to be shredded 81 completely blocks the shredding inlet 211, making it impossible to achieve the function of cutting in line for shredding. However, the automatic side feed channel 32 of this invention rolls the paper to be shredded 81 from the side into the paper winding gap between the upper paper feeding roller 51 and the lower paper feeding roller 52, and folds it at the same time as winding it in, thereby shortening the feeding stroke of the paper to be shredded 81 and speeding up the feeding speed. Then, the paper to be shredded 81 is guided to the shredding inlet 211 of the shredding knife 21 through the transverse feed channel, so that the automatic side feed channel 32 is located beside the shredding knife 21, and the paper is wound up. The mechanism isolates the paper feed side of the horizontal paper feed channel to prevent the shredder 21 from being exposed in the automatic side paper feed channel 32, thereby improving safety. The paper winding mechanism is located below the paper to be shredded 81. When feeding paper, the paper to be shredded 81 is folded from the middle to the lower end and wound into the paper winding gap. When the folded part 811 of the paper to be shredded 81 separates from the lower paper feed roller 52, the next paper to be shredded 81 is wound into the paper winding gap by the lower paper feed roller 52, thereby making the two adjacent paper to be shredded 81 overlap during feeding, so as to further improve the feeding efficiency. When shredding continuously, a single or a small number of paper to be shredded 81 are directly inserted into the shredding inlet 211 through the vertical paper feed channel 31, so that the automatic side paper feed channel 32 and the vertical paper feed channel 31 feed paper at the same time, realizing the shredding function and further improving the convenience of use.

[0054] Specifically, the paper pressing mechanism 6 includes a paper feed detection component 61, a paper pressing drive component, a paper pressing plate 67, and a paper pressing elastic element 68. The paper feed detection component 61 is disposed on one side of the automatic side paper feed channel 32. The paper feed detection component 61 and the paper pressing drive component are electrically connected to the control circuit. The paper pressing plate 67 is disposed on one side of the automatic side paper feed channel 32 along the inclined direction of the automatic side paper feed channel 32. The paper pressing plate 67 is slidably mounted on the shredder core 2 and extends into the automatic side paper feed channel 32 from the outside of the automatic side paper feed channel 32. The paper pressing drive component is drively connected to the paper pressing plate 67. The paper-pressing elastic element 68 is disposed between the pressure plate 67 and the shredder core 2 to move towards and away from the paper winding mechanism. This enables the pressure plate 67 to be driven to return to the paper winding mechanism. The paper feeding detection component 61 detects whether there is paper 81 to be shredded in the automatic side paper feeding channel 32, thereby controlling the pressure plate driving component to drive the pressure plate 67 to move. This allows the paper 81 to be shredded to be pressed against the paper winding mechanism during paper feeding and to be avoided during paper unloading. This eliminates the need for manual operation and improves operational convenience. Furthermore, it facilitates the removal of the pressure plate 67 from the automatic side paper feeding channel 32 for cleaning in case of paper jams.

[0055] The distance between the paper feed point E and the lower end of the automatic side paper feed channel 32 is set to D. After the paper to be shredded 81 is folded, a folded part 811 is formed on one side of the paper to be shredded 81. The length of the folded part 811 is set to L. The radius of the lower paper feed roller 52 is set to R. D = L + R + compensation coefficient H. The compensation coefficient H is 0.3-0.8cm and L is 2-10cm. Since the folding is performed in the lower middle part of the paper to be shredded 81, after each paper to be shredded 81 enters the horizontal paper feed channel, the two adjacent papers to be shredded 81 partially overlap. The maximum number of overlapping papers to be shredded 81 in the horizontal paper feed channel is more than 3. The maximum number of overlapping papers is adjusted by controlling the distance between the paper feed point E and the lower end of the automatic side paper feed channel 32. Preferably, the maximum number of overlapping papers is 3-15. When shredding A4-sized paper to be shredded 81, when the maximum number of overlapping papers is 3, L = 2cm; when the maximum number of overlapping papers is 5, L = 3.34cm; when the maximum number of overlapping papers is 10, L = 6.67cm; and when the maximum number of overlapping papers is 15, L = 10cm.

[0056] Specifically, the paper feed detection assembly 61 includes a light sensor, which is located at the lower part of the automatic side paper feed channel 32 and electrically connected to the control circuit; the paper pressing drive assembly includes a paper pressing drive motor 62, a paper pressing shaft 671, a paper pressing drive cam 64, a paper pressing trigger cam 65, and a paper pressing trigger switch 66. The paper pressing drive motor 62 is fixedly installed on the shredder core 2, and the paper pressing shaft 671 is rotatably installed on the shredder core 2. The paper pressing drive motor 62 is drively connected to the paper pressing shaft 671. The paper pressing drive cam 64 and the paper pressing trigger cam 65 are respectively fixedly installed on the paper pressing shaft 671. The paper pressing trigger switch 66 is electrically connected to the control circuit and triggers the paper pressing trigger cam 65. The side of the pressing plate 67 away from the automatic side paper feed channel 32 is provided with a drive connection seat 672 and multiple sliding columns. 674, each slide column 674 is slidably installed on the shredder core 2, each slide column 674 is fitted with a paper-pressing elastic element 68, the drive connecting seat 672 has a sliding groove 673, the sliding groove 673 is slidably engaged with the paper-pressing rotating shaft 671, and the paper-pressing trigger cam 65 is engaged with the drive connecting seat 672; when the light control sensor does not detect the paper to be shredded 81, the paper-pressing drive motor 62 runs, driving the paper-pressing rotating shaft 671 to rotate until the flange of the paper-pressing drive cam 64 abuts against the drive connecting seat 672, the drive connecting seat 672 moves away from the paper winding mechanism, thereby moving the paper pressing plate 67 out of the automatic side paper feeding channel 32, at this time the paper-pressing trigger cam 65 abuts against the paper-pressing trigger switch 66, thereby stopping the paper-pressing drive motor 62, so that the flange of the paper-pressing drive cam 64 remains abutting against the drive connecting seat 672;

[0057] When the light sensor detects the paper to be shredded 81, the paper pressing drive motor 62 runs again for a preset time and then stops, driving the paper pressing shaft 671 to rotate until the paper pressing drive cam 64 separates from the drive connecting seat 672, thereby releasing the drive connecting seat 672. Under the action of the paper pressing elastic element 68, the pressing plate 67 moves toward the paper winding mechanism and extends into the automatic side paper feeding channel 32, thereby pressing the paper stack 8 against the paper winding mechanism. This achieves automatic driving of the pressing plate 67, eliminating the need for manual operation. The structure is simple, the cost is low, and the convenience is high.

[0058] At least two feed shafts 63 are rotatably mounted on the side of the pressure plate 67 facing the paper winding mechanism. The two feed shafts 63 are respectively located beside the upper paper feed roller 51 and the lower paper feed roller 52. By contacting the paper to be shredded 81 through the feed shafts 63, the friction between the pressure plate 67 and the paper to be shredded 81 is reduced, the paper feeding resistance is reduced, and paper jams are further prevented.

[0059] Specifically, the shredding drive mechanism includes a shredding drive motor and a shredding drive gear set 41. The shredding drive motor is fixedly installed on the shredder core 2 and is connected to the shredding drive gear set 41 for transmission. The upper paper feeding roller 51 and the lower paper feeding roller 52 are respectively provided with an upper paper feeding transmission gear 511 and a lower paper feeding transmission gear 521 at the same end. The upper paper feeding transmission gear 511 and the lower paper feeding transmission gear 521 mesh with each other. The shredding drive gear set 41 meshes with the lower paper feeding transmission gear 521. An arc-shaped lower guide plate 22 is provided on the upper part of the shredding cutter 21. One side of the lower guide plate 22 extends to the middle of the shredding inlet 211. A paper guiding mechanism 7 is provided between the paper winding mechanism and the shredding inlet 211. A transverse paper feeding channel is formed between the paper guiding mechanism 7 and the lower guide plate 22. The upper paper feed roller 51 and the lower paper feed roller 52 are driven by a paper shredding drive mechanism, eliminating the need for a separate drive mechanism. This results in a simple structure and low cost. The paper to be shredded 81 is guided by the paper guide mechanism and then guided a second time by the lower guide plate 22, thereby increasing the success rate of the paper to be shredded 81 entering the shredding inlet 211, avoiding paper jams, and improving reliability and stability. The upper paper feed roller 51 and the lower paper feed roller 52 isolate the paper feeding side of the transverse paper feed channel, thereby blocking the automatic side paper feed channel 32 and the shredding inlet 211, thus preventing foreign objects or fingers from being inserted into the shredding inlet 211 and improving safety.

[0060] Specifically, the paper guiding mechanism 7 includes at least one paper guiding roller 71, which is rotatably mounted on the shredder core 2. The paper guiding roller 71 is positioned on the side of the upper paper feed roller 51 facing the shredder cutter 21, and the lower part of the paper guiding roller 71 rotates towards the shredder cutter 21. One end of the paper guiding roller 71 is provided with a paper guiding drive gear 711, which meshes with the lower paper feed drive gear 521. The paper guiding roller 71 dynamically guides the paper to be shredded 81. The rotation direction of the paper guiding roller 71 is the same as that of the upper paper feed roller 51. The paper guiding roller 71 is driven by the lower paper feed roller 52, eliminating the need for an additional drive mechanism. Furthermore, the active rotation improves the success rate and efficiency of the guiding mechanism.

[0061] Specifically, the paper guiding mechanism 7 includes a paper guiding housing 72, which is fixedly installed on the shredder core 2. The paper guiding housing 72 is provided with at least one paper guiding arc surface 721, one end of which extends above the paper roll gap and the other end extends above the shredding inlet 211. The paper guiding housing 72 provides static guidance for the paper to be shredded 81, which moves along the paper guiding arc surface 721 to the shredding inlet 211. The structure is simple and the cost is low.

[0062] Specifically, the upper part of the shredder head 1 is provided with a paper feeding mounting groove 11, and a paper feeding base plate 12 and a paper feeding flap 14 are provided in the paper feeding mounting groove 11. The paper feeding base plate 12 is movably installed above the shredder core 2. A locking component 13 is provided at the rear of the paper feeding base plate 12. The locking component 13 locks and cooperates with the shredder head 1. A vertical paper feeding channel 31 is opened at the front of the paper feeding base plate 12. The lower part of the paper feeding flap 14 is hinged to the rear side of the paper feeding mounting groove 11. A paper tray 15 with openings at the top and bottom is provided on the front side of the paper feeding flap 14. When automatic paper feeding is performed, the lower part of the paper tray 15 is aligned with and connected to the automatic side paper feeding channel 32. When the automatic paper feeding function is not used, the paper feeding flap 14 covers the rear of the paper feeding mounting groove 11 and seals the automatic side paper feeding channel 32. The paper feed base plate 12 is detachably mounted on the shredder head 1 via the locking assembly 13. The paper feed base plate 12 can cover the shredder core 2, protecting its internal structure and facilitating disassembly. The vertical paper feed channel 31 is located on the paper feed base plate 12, allowing for easy removal of the base plate 12 in case of paper jams, exposing the shredding inlet 211 to the paper feed mounting slot 11 for easy clearing. During continuous shredding, the paper feed flap 14 is flipped open, making its tilt angle similar to that of the automatic side paper feed channel 32. The paper stack 8 is inserted from the paper tray 15 into the automatic side paper feed channel 32, thus shortening its length. When the continuous shredding function is not in use, the paper feed flap 14 is closed to seal the automatic side paper feed channel 32, reducing the overall height of the machine and protecting the shredder core 2.

[0063] A paper feeding method for a paper shredder includes the following steps:

[0064] The paper-laying process includes the following sub-steps:

[0065] In the automatic paper shredding process, the paper shredder provides an automatic side paper feeding channel 32 through an automatic paper feeding compartment located on one side of the manual paper feeding inlet 311. The lower end of the automatic side paper feeding channel 32 is horizontally offset from the shredding inlet 211. Multiple sheets of paper 81 to be shredded are stacked in the automatic side paper feeding channel 32, forming a paper pile 8 in the automatic side paper feeding channel 32. The lower end of the paper pile 8 is located below the shredding inlet 211 of the paper shredder blade 21.

[0066] When shredding paper continuously, if it is necessary to prioritize shredding a single sheet or a small number of sheets of paper 81, a manual shredding and paper feeding step is performed. The single sheet or a small number of stacked sheets of paper 81 are inserted into the vertical paper feed channel 31 through the shredding inlet 211. The vertical paper feed channel 31 guides the sheets of paper 81 to the shredding inlet 211. The sheets of paper 81 in the vertical paper feed channel 31 and the sheets of paper 81 in the automatic side paper feed channel 32 enter the shredding inlet 211 at the same time to realize the priority shredding function.

[0067] In the paper pressing step, after the paper feed sensor detects that a paper stack 8 has entered, the paper pressing drive mechanism drives the paper pressing mechanism 6 to move toward the paper stack 8 and keep the paper stack 8 pressed against the paper winding mechanism; when the paper feed sensor detects that there is no paper stack 8 in the automatic side paper feed channel 32, the paper pressing drive mechanism drives the paper pressing mechanism 6 to move toward the side away from the paper winding mechanism, so that the paper pressing mechanism 6 moves out of the automatic side paper feed channel 32, and then the paper feeding step is repeated;

[0068] In the folding and rolling process, the upper paper feed roller 51 of the rolling mechanism rotates in the forward direction, and the lower paper feed roller 52 of the rolling mechanism rotates in the reverse direction. The lower part of the upper paper feed roller 51 and the upper part of the lower paper feed roller 52 both rotate from one side of the paper stack 8 toward the side of the shredder 21. The lower paper feed roller 52 has a paper feed point E for paper feed. The paper feed point E is higher than the lower end of the automatic side paper feed channel 32 in the direction parallel to the automatic side paper feed channel 32. The rolling mechanism folds the middle and lower part of the paper to be shredded 81 in the automatic side paper feed channel 32, forming a folded part 811 at the lower part of the paper to be shredded 81. The folded paper to be shredded 81 is rolled into the horizontal paper feed channel. Two adjacent papers to be shredded 81 partially overlap after entering the horizontal paper feed channel. The maximum number of overlapping sheets of paper to be shredded 81 in the horizontal paper feed channel is more than 3 sheets.

[0069] After the paper winding mechanism folds and winds in the first sheet of paper to be shredded 81, the first sheet of paper to be shredded 81 is first separated from the lower paper feed roller 52. The upper paper feed roller 51 remains in contact with the first sheet of paper to be shredded 81. The lower paper feed roller 52 rubs the second sheet of paper to be shredded 81. The front end of the folded portion 811 of the second sheet of paper to be shredded 81 is close to or abuts the end of the folded portion 811 of the first sheet of paper to be shredded 81, so that the second sheet of paper to be shredded 81 and the first sheet of paper to be shredded 81 partially overlap as they enter the transverse paper feed channel. The lower paper feed roller 52 separates from the second sheet of paper to be shredded 81 again. The lower paper feed roller 52 rubs the third sheet of paper to be shredded 81. The front end of the folded portion 811 of the third sheet of paper to be shredded 81 is close to or abuts the end of the folded portion 811 of the second sheet of paper to be shredded 81. Paper is fed in this way in a continuous overlapping manner. The transverse paper feed channel is blocked on the paper feed side by the upper paper feed roller 51 and the lower paper feed roller 52.

[0070] Both the upper paper-feeding roller 51 and the lower paper-feeding roller 52 are located between the middle and lower ends of the paper stack 8. The distance between the paper-feeding point E and the lower end of the paper stack 8 is set as D, the length of the folded part 811 is set as L, and the radius of the lower paper-feeding roller 52 is set as R. D = L + R + compensation coefficient H, where the compensation coefficient H is 0.3-0.8 cm, L is 2-10 cm, and the maximum number of overlapping sheets is 3 to 15 sheets. When shredding A4-sized paper 81, when the maximum number of overlapping sheets is 3, L = 2 cm; when the maximum number of overlapping sheets is 5, L = 3.34 cm; when the maximum number of overlapping sheets is 10, L = 6.67 cm; and when the maximum number of overlapping sheets is 15, L = 10 cm.

[0071] In the paper guiding step, the paper to be shredded 81, which is folded and overlapped by the paper winding mechanism, is guided to the shredding inlet 211 through the horizontal paper feeding channel set between the automatic side paper feeding channel 32 and the shredding inlet 211. After passing through the paper winding mechanism, the folded and overlapped paper to be shredded 81 abuts against the paper guiding mechanism 7 in the horizontal paper feeding channel. The paper to be shredded 81 moves towards the shredding inlet 211 of the paper shredder 21 along the guiding direction of the paper guiding mechanism 7.

[0072] The paper guiding mechanism 7 adopts a paper guiding roller 71 or a paper guiding arc surface 721, such as Figure 6 and Figure 7 As shown, when the paper guiding mechanism 7 uses a paper guiding roller 71, the paper to be shredded 81 moves out of the paper winding mechanism and abuts against the paper guiding roller 71. The rotation direction of the paper guiding roller 71 is the same as the rotation direction of the upper paper feeding roller 51. The paper guiding roller 71 changes the moving direction of the paper to be shredded 81, causing the paper to be shredded 81 to move towards the shredding inlet 211; as shown Figure 8 and Figure 9 As shown, when the paper guiding mechanism 7 adopts the paper guiding arc surface 721, one end of the paper guiding arc surface 721 extends to the side of the paper winding mechanism and the other end extends to the top of the shredding inlet 211. After the shredded paper 81 is removed from the paper winding mechanism, it moves along the paper guiding arc surface 721 toward the shredding inlet 211.

[0073] In the shredding step, the shredder 21 is driven to rotate by the shredding drive mechanism, which shreds the paper 81 to be shredded from the shredding inlet 211 into paper scraps. The shredder 21 simultaneously shreds the paper 81 to be shredded in the vertical paper feed channel 31 and the paper 81 to be shredded in the automatic side paper feed channel 32.

[0074] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A paper shredder with an improved automatic paper feeding device, comprising a shredder head (1), a shredder core (2), and a control circuit, wherein the shredder core (2) and the control circuit are respectively disposed within the shredder head (1), the shredder core (2) is provided with a shredder blade (21) and a shredder driving mechanism, the shredder driving mechanism being drively connected to the shredder blade (21), and the control circuit being electrically connected to the shredder driving mechanism, characterized in that: The upper part of the shredder head (1) is provided with a manual paper inlet (311) and an automatic paper inlet, which are spaced apart. The upper part of the shredder blade (21) is provided with a shredding inlet (211), which is located below the manual paper inlet (311). The manual paper inlet (311) is vertically connected to the shredding inlet (211) through a vertical paper feeding channel (31). An automatic side paper feeding channel (32) is provided in the automatic paper inlet, which is inclined to the side of the shredder blade (21). The lower end of the automatic side paper feeding channel (32) is lower than the top of the shredding inlet (211). A horizontal paper feeding channel is provided between the automatic side paper feeding channel (32) and the shredding inlet (211). A paper winding mechanism is provided on the side of the horizontal paper feeding channel adjacent to the automatic side paper feeding channel (32). The paper winding mechanism is equipped with an upper paper feed roller (51) and a lower paper feed roller (52). The upper paper feed roller (51) and the lower paper feed roller (52) are arranged from top to bottom along the inclined direction of the automatic side paper feed channel (32). There is a paper winding gap between the upper paper feed roller (51) and the lower paper feed roller (52). The rotation directions of the upper paper feed roller (51) and the lower paper feed roller (52) are opposite. The lower paper feed roller (52) has a paper feeding point E for paper feeding. The paper feeding point E is higher than the lower end of the automatic side paper feed channel (32) in the direction parallel to the automatic side paper feed channel (32). When the paper winding mechanism feeds the paper, the middle or lower part of the paper to be shredded (81) is folded and wound into the paper winding gap. The automatic side paper feeding channel (32) is equipped with a paper pressing mechanism (6), which is located on the opposite side of the paper winding mechanism.

2. A paper shredder with an improved automatic paper feeding device according to claim 1, characterized in that: The paper pressing mechanism (6) includes a paper feeding detection component (61), a paper pressing drive component, a paper pressing plate (67), and a paper pressing elastic element (68). The paper feeding detection component (61) is disposed on one side of the automatic side paper feeding channel (32). The paper feeding detection component (61) and the paper pressing drive component are electrically connected to the control circuit. The paper pressing plate (67) is disposed on one side of the automatic side paper feeding channel (32) along the inclined direction of the automatic side paper feeding channel (32). The paper pressing plate (67) is slidably installed on the shredder core (2) and extends into the automatic side paper feeding channel (32) from the outside of the automatic side paper feeding channel (32). The paper pressing drive component and the paper pressing plate (67) transmit power. The paper pressure plate (67) moves towards and away from the paper winding mechanism. The paper pressure elastic element (68) is located between the paper pressure plate (67) and the paper shredder core (2) to drive the paper pressure plate (67) to reset towards the paper winding mechanism. The distance between the paper feeding point E and the lower end of the automatic side paper feeding channel (32) is set as D. After the paper to be shredded (81) is folded, a folded part (811) is formed on one side of the paper to be shredded (81). The length of the folded part (811) is set as L. The radius of the lower paper feeding roller (52) is set as R. D = L + R + compensation coefficient H, where the compensation coefficient H is 0.3-0.8cm and L is 2-10cm.

3. A paper shredder with an improved automatic paper feeding device according to claim 2, characterized in that: The paper feed detection component (61) includes a light control sensor, which is located at the lower part of the automatic side paper feed channel (32) and electrically connected to the control circuit. The paper pressing drive assembly includes a paper pressing drive motor (62), a paper pressing shaft (671), a paper pressing drive cam (64), a paper pressing trigger cam (65), and a paper pressing trigger switch (66). The paper pressing drive motor (62) is fixedly installed in the shredder core (2), and the paper pressing shaft (671) is rotatably installed in the shredder core (2). The paper pressing drive motor (62) is connected to the paper pressing shaft (671) in a transmission connection. The paper pressing drive cam (64) and the paper pressing trigger cam (65) are respectively fixedly installed in the paper pressing shaft (671). The paper pressing trigger switch (66) is connected to the control circuit. Electrically connected and triggered by the paper pressing trigger cam (65), the paper pressing plate (67) is provided with a drive connecting seat (672) and multiple slide columns (674) on the side away from the automatic side paper feeding channel (32). Each slide column (674) is slidably installed on the paper shredder core (2). Each slide column (674) is fitted with a paper pressing elastic element (68). The drive connecting seat (672) is provided with a slide groove (673). The slide groove (673) is slidably engaged with the paper pressing shaft (671). The paper pressing trigger cam (65) is abutted against the drive connecting seat (672). When the light sensor does not detect the paper to be shredded (81), the flange of the paper pressing drive cam (64) abuts against the drive connector (672), the paper pressing trigger cam (65) abuts against the paper pressing trigger switch (66), and the paper pressing board (67) exits the automatic side paper feeding channel (32). When the light sensor detects the paper to be shredded (81), the paper pressing drive cam (64) separates from the drive connector (672), the paper pressing trigger cam (65) separates from the paper pressing trigger switch (66), and the pressing plate (67) extends into the automatic side paper feeding channel (32) and presses against the paper to be shredded (81). The pressure plate (67) is rotatably mounted with at least two paper feed shafts (63) on one side facing the paper winding mechanism. The two paper feed shafts (63) are respectively located on the side of the upper paper feed roller (51) and the lower paper feed roller (52).

4. A paper shredder with an improved automatic paper feeding device according to claim 1, characterized in that: The paper shredding drive mechanism includes a paper shredding drive motor and a paper shredding drive gear set (41). The paper shredding drive motor is fixedly installed on the paper shredder core (2). The paper shredding drive motor is connected to the paper shredding drive gear set (41) for transmission. The upper paper-feeding roller (51) and the lower paper-feeding roller (52) are respectively provided with an upper paper-feeding drive gear (511) and a lower paper-feeding drive gear (521) at the same end. The upper paper-feeding drive gear (511) and the lower paper-feeding drive gear (521) mesh with each other. The paper shredding drive gear set (41) meshes with the lower paper-feeding drive gear (521). The upper part of the paper shredder (21) is provided with an arc-shaped lower guide plate (22), one side of which extends to the middle of the shredding inlet (211). A paper guiding mechanism (7) is provided between the paper winding mechanism and the shredding inlet (211), and the horizontal paper feeding channel is formed between the paper guiding mechanism (7) and the lower guide plate (22).

5. A paper shredder with an improved automatic paper feeding device according to claim 4, characterized in that: The paper guiding mechanism (7) includes at least one paper guiding roller (71), which is rotatably mounted on the shredder core (2). The paper guiding roller (71) is located on the side of the upper paper feed roller (51) facing the shredder cutter (21). The lower part of the paper guiding roller (71) rotates towards the side of the shredder cutter (21). One end of the paper guiding roller (71) is provided with a paper guiding transmission gear (711), which meshes with the lower paper feed transmission gear (521).

6. A paper shredder with an improved automatic paper feeding device according to claim 4, characterized in that: The paper guiding mechanism (7) includes a paper guiding housing (72), which is fixedly installed on the paper shredder core (2). The paper guiding housing (72) is provided with at least one paper guiding arc surface (721), one end of which extends above the paper roll gap and the other end extends above the shredder inlet (211).

7. A paper shredder with an improved automatic paper feeding device according to any one of claims 1 to 6, characterized in that: The upper part of the shredder head (1) is provided with a paper feeding mounting groove (11), and a paper feeding base plate (12) and a paper feeding flap (14) are provided in the paper feeding mounting groove (11). The paper feeding base plate (12) is movably installed above the shredder core (2). A locking component (13) is provided at the rear of the paper feeding base plate (12). The locking component (13) locks with the shredder head (1). The vertical paper feeding channel (31) is opened in the paper feeding base plate (1). 2) The lower part of the paper feed flap (14) is hinged to the rear side of the paper feed mounting groove (11). The front side of the paper feed flap (14) is provided with a paper tray (15) with openings at the top and bottom. When automatic paper feeding is performed, the lower part of the paper tray (15) is aligned with and connected to the automatic side paper feed channel (32). When the automatic paper feeding function is not used, the paper feed flap (14) covers the rear part of the paper feed mounting groove (11) and seals the automatic side paper feed channel (32).

8. A paper shredder feeding method, comprising a paper shredder feeding method using an improved automatic paper feeding device as described in any one of claims 1 to 7, characterized in that: Includes the following steps, The paper-laying process includes the following sub-steps: In the automatic paper feeding step, the paper shredder provides an automatic side feeding channel (32) through an automatic paper feeding compartment located on one side of the manual paper feeding inlet (311). The lower end of the automatic side feeding channel (32) is horizontally offset from the shredding inlet (211). Multiple sheets of paper to be shredded (81) are stacked in the automatic side feeding channel (32), and the sheets of paper to be shredded (81) form a paper pile (8) in the automatic side feeding channel (32). The lower end of the paper pile (8) is located below the shredding inlet (211) of the paper shredder blade (21). In the manual paper feeding step, the paper shredder inserts the paper to be shredded (81) through the manual paper inlet (311) set in the shredder head (1), and guides the paper to be shredded (81) to the shredding inlet (211) set in the upper part of the shredder blade (21) through the vertical paper inlet channel (31); In the paper pressing step, after the paper feed sensor detects that a paper stack (8) has entered, the paper pressing drive mechanism drives the paper pressing mechanism (6) to move toward the paper stack (8) and keep the paper stack (8) pressed tightly on the paper winding mechanism; In the folding and rolling step, the upper paper-feeding roller (51) of the rolling mechanism rotates in the forward direction, and the lower paper-feeding roller (52) of the rolling mechanism rotates in the reverse direction. The lower part of the upper paper-feeding roller (51) and the upper part of the lower paper-feeding roller (52) rotate from one side of the paper stack (8) toward the side of the shredder (21). The lower paper-feeding roller (52) has a paper-feeding point E for paper-feeding. The paper-feeding point E is higher than the lower end of the automatic side paper-feeding channel (32) in the direction parallel to the automatic side paper-feeding channel (32). The rolling mechanism folds the middle and lower part of the paper to be shredded (81) in the automatic side paper-feeding channel (32) to form a fold (811) at the lower part of the paper to be shredded (81). The folded paper to be shredded (81) is rolled into the horizontal paper-feeding channel. Two adjacent papers to be shredded (81) partially overlap after entering the horizontal paper-feeding channel. The maximum number of overlapping sheets of paper to be shredded (81) in the horizontal paper-feeding channel is more than 3 sheets. In the paper guiding step, the paper to be shredded (81) folded and overlapping by the paper feeding mechanism is guided to the shredding inlet (211) through the transverse paper feeding channel set between the automatic side paper feeding channel (32) and the shredding inlet (211); In the paper shredding step, the paper shredder (21) is driven to rotate by the paper shredding drive mechanism, which shreds the paper (81) to be shredded from the shredding inlet (211) into paper scraps.

9. A paper feeding method for a paper shredder according to claim 8, characterized in that: In the folding and rolling step, after the rolling mechanism folds and rolls in the first sheet of paper to be shredded (81), the first sheet of paper to be shredded (81) first separates from the lower paper feed roller (52), the upper paper feed roller (51) remains in contact with the first sheet of paper to be shredded (81), and the lower paper feed roller (52) rubs the second sheet of paper to be shredded (81). The front end of the folded portion (811) of the second sheet of paper to be shredded (81) is adjacent to or abuts against the end of the folded portion (811) of the first sheet of paper to be shredded (81), so that it enters the transverse paper feed passage. The second sheet of paper to be shredded (81) overlaps with the first sheet of paper to be shredded (81) in the feed path. The lower paper feed roller (52) separates from the second sheet of paper to be shredded (81) again. The lower paper feed roller (52) rubs the third sheet of paper to be shredded (81). The front end of the fold (811) of the third sheet of paper to be shredded (81) is adjacent to or abuts the end of the fold (811) of the second sheet of paper to be shredded (81). Paper is fed in this way in a continuous overlapping manner. The upper paper feed roller (51) and the lower paper feed roller (52) separate the horizontal paper feed path on the paper feed side of the horizontal paper feed path. The upper paper feed roller (51) and the lower paper feed roller (52) are both located between the middle and the lower end of the paper stack (8). The distance between the paper feed point E and the lower end of the paper stack (8) is set as D. The length of the fold (811) is set as L. The radius of the lower paper feed roller (52) is set as R. D = L + R + compensation coefficient H. The compensation coefficient H is 0.3-0.8cm, L is 2-10cm, and the maximum number of overlapping sheets is 3 to 15 sheets.

10. A paper feeding method for a paper shredder according to claim 8, characterized in that: In the paper pressing step, when the paper feed sensor detects that there is no paper stack (8) in the automatic side paper feed channel (32), the paper pressing drive mechanism drives the paper pressing mechanism (6) to move toward the side away from the paper winding mechanism, so that the paper pressing mechanism (6) moves out of the automatic side paper feed channel (32), and then repeats the paper feeding step; In the paper shredding step, the paper shredder (21) simultaneously shreds the paper to be shredded (81) in the vertical paper feed channel (31) and the paper to be shredded (81) in the automatic side paper feed channel (32); In the paper guiding step, the folded and overlapping paper to be shredded (81) passes through the paper winding mechanism and then abuts against the paper guiding mechanism (7) in the horizontal paper feeding channel. The paper to be shredded (81) moves along the guiding direction of the paper guiding mechanism (7) toward the shredding inlet (211) of the paper shredder (21).

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