Automatic document feeder of copying machine

Abstract

The invention discloses an automatic document feeder of a copying machine, which comprises a document feeding box, a deflection plate and a document feeding assembly, and is characterized in that the deflection plate is fixedly connected with the document feeding box, the deflection plate and the document feeding box are arranged at an inclined angle, and the deflection plate is used for containing paper to be copied; the draft feeding assembly is used for conveying paper on the deflection plate to the draft conveying box and comprises a mechanism box, a hollow roller and a plurality of negative pressure mechanisms. Temporary negative pressure is generated at the position of the contact negative pressure hole, the contact wheel face of the hollow roller can adsorb paper to move forwards, then the temporary negative pressure disappears, and therefore the paper can be stably driven to be conveyed forwards along with continuous rolling of the hollow roller; the contact force between the hollow roller and the paper can be increased, and stable and smooth conveying can be guaranteed even if the paper is very smooth.

Description

Technical Field

[0001] The invention relates to the technical field of copier accessories, in particular to an automatic document feeder for a copier. Background Art

[0002] In modern office environments, photocopiers are used very frequently. When copying multi-page documents, traditional photocopiers need to manually place the originals page by page, which is cumbersome and inefficient. In order to solve this problem, automatic document feeders came into being.

[0003] At present, the automatic document feeder mainly relies on the rolling of the pickup wheel to drive the paper forward one by one in the process of conveying paper into the copier. The principle of driving the paper forward is mainly based on the friction between the pickup wheel and the paper. However, in actual application scenarios, when it is necessary to convey some paper with a smooth surface and a low friction coefficient, the pickup wheel is prone to slipping due to the obvious lack of friction between such paper and the pickup wheel surface, making it difficult to effectively drive the paper forward. The existence of this situation greatly limits the adaptability of the automatic document feeder when facing different types of paper, and it is unable to smoothly complete the conveying tasks of various papers. For example, some glossy coated paper or paper with special smooth treatment (light drawings used in some brochures and manuals, matte powder paper used in high-end picture albums and book covers, etc.) often cause the automatic document feeder to have problems such as paper jams and poor paper feeding during the conveying process due to insufficient friction with the pickup wheel, which seriously affects the work efficiency and user experience of the copier. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose an automatic document feeder for a copier.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An automatic document feeder of a copy machine comprises a document feed box, a deflection plate and a document feed assembly, wherein the deflection plate is fixedly connected to the document feed box, and the deflection plate and the document feed box are arranged at an inclined angle, and the deflection plate is used to hold paper to be copied; The document feed assembly is used to transport the paper on the deflection plate toward the document feed box. The document feed assembly includes a mechanism box, a hollow roller and a plurality of negative pressure mechanisms. The circumferential side wall of the hollow roller is provided with a plurality of negative pressure holes. The negative pressure mechanism is used to generate temporary negative pressure at each negative pressure hole.

[0006] Preferably, a transmission groove is formed on the side wall of the mechanism box, a slider is slidably connected in the transmission groove, a small DC motor is installed on the side wall of the slider, and the output shaft of the small DC motor is fixedly connected to the hollow roller.

[0007] Preferably, a sliding rod is fixedly connected to the bottom of the transmission groove, and the sliding rod slides through the slider, the upper end of the slider is fixedly connected to a first spring, and the upper end of the first spring is fixedly connected to the inner top of the transmission groove.

[0008] Preferably, the negative pressure mechanism includes a negative pressure cylinder, a sliding plug, and a second spring, wherein the sliding plug is sealingly slidably arranged in the negative pressure cylinder, one end of the second spring is fixedly connected to the sliding plug, and the end of the second spring away from the sliding plug is fixedly connected to the inner wall of the negative pressure cylinder.

[0009] Preferably, a connecting rod is fixedly connected to the upper end of the slider, and the end of the connecting rod away from the slider extends into the hollow roller, and the end of the connecting rod away from the slider is fixedly connected to a guide column, and the side wall of the guide column is provided with an arc-shaped groove, and a support rod is fixedly connected to the sliding plug, and the end of the support rod away from the sliding plug is rotatably connected to a walking wheel, and the walking wheel moves along the circumferential surface of the guide column.

[0010] Preferably, guide grooves are provided on both sides of the document feed box, guide plates are slidably connected in the guide grooves, blocking plates are fixedly connected to the side walls of the guide plates, paper outlet slots are provided on the side walls of the blocking plates, paper outlet nozzles are also fixedly connected to the side walls of the blocking plates, and the paper outlet nozzles are communicated with the paper outlet slots.

[0011] Preferably, a driven gear is rotatably connected in the mechanism box, and a driven rack meshing with the driven gear is also slidably connected in the mechanism box. The driven rack is fixedly connected to the guide plate through a push rod, and the driven rack is arranged parallel to the guide plate and the blocking plate.

[0012] Preferably, a driving gear is rotatably connected in the transmission groove, and a driving rack meshing with the driving gear is also slidably connected in the transmission groove. The driving rack is fixedly connected to the slider through a connecting rod, and the driving gear is fixedly connected to the driven gear through a rotating shaft.

[0013] Preferably, a limit rod is fixedly connected to the inner wall of the mechanism box, and the limit rod slides through the driven rack.

[0014] Preferably, the negative pressure cylinders are fixedly connected together via an annular frame.

[0015] The present invention has the following beneficial effects: 1. By setting multiple negative pressure holes around the hollow roller of the paper feeding assembly, and setting a negative pressure mechanism to generate a temporary negative pressure at the position of the negative pressure hole when the wheel surface of a certain side of the hollow roller contacts the paper, the contact wheel surface of the hollow roller can absorb the paper and move forward, and then the temporary negative pressure disappears, so that the paper can be stably driven forward as the hollow roller continues to roll. By adding a temporary negative pressure, the contact strength between the hollow roller and the paper can be increased, and stable and smooth transportation can be guaranteed even when facing some very smooth papers; 2. By setting an inclined deflection plate, when the paper to be copied is placed on the deflection plate, the paper can be stacked at an angle, which can effectively reduce the friction between each paper caused by the weight of the paper itself, and ensure that the feeding component will not carry multiple sheets of paper together when conveying the paper, greatly improving the accuracy and stability of the feeding; 3. By setting up a blocking plate, the paper stacked on the deflection plate can be blocked to prevent the tilted stacked paper from sliding off. At the same time, as the paper is transported one by one and the stacking height is gradually reduced, the blocking plate can also be gradually moved down under the action of the driving gear, driving rack, driven gear and driven rack to ensure smooth transportation of the paper; 4. By arranging mutually parallel guide plates, blocking plates and driven racks, when the hollow roller moves vertically downward, the inclined guide plates, blocking plates and driven racks can be smoothly moved downward under the action of the driving gear and the driven gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of an automatic document feeder for a copier proposed by the present invention; Figure 2 It is a schematic diagram of the connection structure between the document feeding box and the guide plate in the present invention; Figure 3 It is a schematic diagram of the structure of the guide plate, the blocking plate, the paper outlet and the deflection plate in the present invention; Figure 4 for Figure 1 A schematic diagram of the structure enlargement at point A; Figure 5 for Figure 1 A schematic diagram of the structure at B in FIG. Figure 6 It is a schematic diagram of the connection structure of the manuscript feeding assembly and the driving gear, the driving rack, the driven gear, the driven rack, the slider, the slide bar, the first spring, the limit rod, the push rod and the guide plate in the present invention; Figure 7 It is a schematic diagram of the connection structure of the interior of the hollow roller and the negative pressure mechanism, the annular frame, the connecting rod, the guide column and other components of the present invention; Figure 8 It is a schematic diagram of the cross-section structure of the internal part of the negative pressure mechanism in the present invention; Fig. 9 It is a schematic diagram of the connection structure between the connecting rod and the guide column in the present invention.

[0017] In the figure: 1 a manuscript feed box, 2 a deflection plate, 3 a mechanism box, 4 a guide slot, 5 a guide plate, 6 a paper output slot, 7 a blocking plate, 8 a transmission slot, 9 a slider, 10 a slide bar, 11 a first spring, 12 a connecting rod, 13 a hollow roller, 14 a negative pressure hole, 15 a connecting rod, 16 a driving rack, 17 a limiting rod, 18 a driven rack, 19 a driven gear, 20 a push rod, 21 a small DC motor, 22 a rotating shaft, 23 a driving gear, 24 a ring frame, 25 a negative pressure cylinder, 26 a support rod, 27 a walking wheel, 28 a guide column, 29 a slide plug, 30 a second spring, 31 an arc-shaped groove, and 32 a paper output nozzle. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Embodiment 1: Reference Figure 1-4 A copy machine automatic document feeder comprises a document feed box 1, a deflection plate 2 and a document feed assembly, wherein the deflection plate 2 is fixedly connected to the document feed box 1, and the deflection plate 2 and the document feed box 1 are arranged at an inclined angle, the deflection plate 2 is used to hold paper to be copied; the document feed assembly is used to transport the paper on the deflection plate 2 toward the document feed box 1, the document feed assembly comprises a mechanism box 3, a hollow roller 13 and a plurality of negative pressure mechanisms, a plurality of negative pressure holes 14 are opened on the circumferential side wall of the hollow roller 13, and the negative pressure mechanism is used to generate temporary negative pressure at each negative pressure hole 14.

[0020] A transmission groove 8 is formed on the side wall of the mechanism box 3 , in which a slider 9 is slidably connected. A small DC motor 21 is installed on the side wall of the slider 9 , and the output shaft of the small DC motor 21 is fixedly connected to the hollow roller 13 .

[0021] Both sides of the document feed box 1 are provided with guide grooves 4, in which guide plates 5 are slidably connected, and the side walls of the guide plates 5 are fixedly connected with blocking plates 7, and the side walls of the blocking plates 7 are provided with paper outlet slots 6, and the side walls of the blocking plates 7 are also fixedly connected with paper outlet nozzles 32, and the paper outlet nozzles 32 are communicated with the paper outlet slots 6. Figure 3 The blocking plate 7 contacts and abuts against the left end of the deflection plate 2, and the two are not connected. This makes it convenient for the blocking plate 7 to block the stacked paper on the deflection plate 2, and the blocking plate 7 can slide freely along the direction of the guide groove 4.

[0022] By setting an inclined deflection plate 2, when the paper to be copied is placed on the deflection plate 2, the paper can be stacked at an angle, which can effectively reduce the friction between each paper caused by the weight of the paper itself, and ensure that the document feeding component will not carry multiple sheets of paper together when conveying the paper, thereby greatly improving the accuracy and stability of document feeding.

[0023] In this embodiment, after the paper to be copied is placed on the inclined deflection plate 2, the paper is also stacked in an inclined state, and the uppermost paper is just at the position of the paper outlet slot 6 of the blocking plate 7. At this time, after the small DC motor 21 is started, the small DC motor 21 will drive the hollow roller 13 to rotate, so as to transport the paper one by one forward and pass through the paper outlet slot 6 and the paper outlet nozzle 32 in sequence; In this process, when the negative pressure holes 14 on the side of the hollow roller 13 come into contact with the surface of the paper, the negative pressure holes 14 can generate a temporary negative pressure under the action of the negative pressure mechanism, thereby adsorbing the paper to increase the contact force between the hollow roller 13 and the paper, and can effectively drive the paper forward when the hollow roller 13 rotates. After the hollow roller 13 rotates a certain angle, the temporary negative pressure generated at the negative pressure hole 14 disappears immediately, so that the hollow roller 13 can be smoothly separated from the paper at this position, so that the device can ensure stable and smooth transportation even when facing some very smooth papers.

[0024] Embodiment 2: A slide bar 10 is fixedly connected to the bottom of the transmission groove 8 , and the slide bar 10 slides through the slider 9 . A first spring 11 is fixedly connected to the upper end of the slider 9 , and the upper end of the first spring 11 is fixedly connected to the inner top of the transmission groove 8 .

[0025] The negative pressure mechanism includes a negative pressure cylinder 25, a sliding plug 29, and a second spring 30, wherein the sliding plug 29 is sealingly slidably disposed in the negative pressure cylinder 25, one end of the second spring 30 is fixedly connected to the sliding plug 29, and the end of the second spring 30 away from the sliding plug 29 is fixedly connected to the inner wall of the negative pressure cylinder 25. The upper end of the slider 9 is fixedly connected with a connecting rod 12, and the end of the connecting rod 12 away from the slider 9 extends into the hollow roller 13, and the end of the connecting rod 12 away from the slider 9 is fixedly connected with a guide column 28, and the side wall of the guide column 28 is provided with an arc groove 31. Specifically, the guide column 28 is only fixedly connected to the connecting rod 12, and the guide column 28 does not contact the inside of the hollow roller 13, so the position of the guide column 28 remains unchanged.

[0026] The slide plug 29 is fixedly connected with a support rod 26, and one end of the support rod 26 away from the slide plug 29 is rotatably connected with a running wheel 27, and the running wheel 27 runs along the circumferential surface of the guide column 28. Each negative pressure cylinder 25 is fixedly connected together through an annular frame 24.

[0027] Reference Figure 8The upper end of the second spring 30 is fixed to the top of the negative pressure cylinder 25, and the lower end is connected to the slide plug 29. Under the action of the second spring 30, the upper running wheel 27 can always abut against the peripheral side of the guide column 28. When the running wheel 27 is located in the arc groove 31, the second spring 30 pulls the slide plug 29 upward, and moves the support rod 26 and the running wheel 27 upward until the running wheel 27 abuts against the inner wall of the arc groove 31.

[0028] In this embodiment, the first spring 11 can apply a downward pressure to the slider 9 so that the hollow roller 13 can always be pressed on the upper end surface of the stacked paper. Before use, the slider 9 can be pushed upward with force to drive the hollow roller 13 to move upward, so that the paper can be conveniently placed on the lower side of the hollow roller 13. After releasing the slider 9, the hollow roller 13 can be pressed on the upper end of the stacked paper.

[0029] In addition, if Figure 6 , Figure 7 and Figure 8 As shown, since the guide column 28 is fixed to the slider 9 through the connecting rod 12, and the guide column 28 is located inside the hollow roller 13, the guide column 28 is always fixed. When the hollow roller 13 rotates, it can drive the negative pressure cylinder 25 inside it to rotate synchronously. Then, as the hollow roller 13 rotates, a certain negative pressure hole 14 on the side of the hollow roller 13 rotates to the lower side and contacts the surface of the paper, and the negative pressure cylinder 25 connected to the negative pressure hole 14 also rotates to the lower side. At this time, the running wheel 27 on the negative pressure cylinder 25 also runs around the side of the guide column 28 to the arc groove 31. Since the running wheel 27 has been running on the full side of the guide column 28 before, the guide column 28 will resist the running wheel 27. When the running wheel 27 runs into the arc groove 31, the running wheel 27 can move a distance toward the axis of the guide column 28. Refer to Figure 8 , that is, the travel wheel 27 moves upward for a certain distance, thereby driving the support rod 26 and the sliding plug 29 to move upward synchronously. When the sliding plug 29 moves upward, a certain negative pressure can be generated on the lower side of the negative pressure cylinder 25 and the negative pressure hole 14 connected to the negative pressure cylinder 25, so that the negative pressure hole 14 rotated to the lower side can provide a certain negative pressure suction force to the paper, so as to increase the contact force between the lower side of the hollow roller 13 and the surface of the paper. As the hollow roller 13 rotates, it will drive the negative pressure cylinder 25 to continue to rotate, and make the travel wheel 27 on the negative pressure cylinder 25 leave the arc groove 31. At this time, the travel wheel 27 moves to the full circumference side of the guide column 28 again, and the guide column 28 can again resist the travel wheel 27 and force the travel wheel 27 to move in the opposite direction, along Figure 8 In the direction shown, the walking wheel 27 moves downward, driving the support rod 26 and the sliding plug 29 to move downward, while relieving the negative pressure on the lower side of the sliding plug 29, air can also be blown toward the lower side of the negative pressure cylinder 25, so that the negative pressure hole 14 leaving the lower side can be smoothly separated from the paper.

[0030] In summary, the negative pressure mechanism in this embodiment can automatically move to the negative pressure hole 14 on the lower side as the hollow roller 13 rotates, and quickly generate a temporary negative pressure, thereby increasing the contact force with the paper and ensuring that the smooth paper can be smoothly conveyed. Moreover, when the negative pressure hole 14 on the lower side leaves, it can also contact the negative pressure and blew out air in time, which facilitates the separation of the negative pressure hole 14 from the paper and achieves the effect of stably conveying the paper.

[0031] Embodiment three: Reference Figure 4-6 A driven gear 19 is rotatably connected in the mechanism box 3, and a driven rack 18 meshing with the driven gear 19 is also slidably connected in the mechanism box 3. The driven rack 18 is fixedly connected to the guide plate through a push rod 20, and the driven rack 18 is parallel to the guide plate 5 and the blocking plate 7.

[0032] A driving gear 23 is rotatably connected in the transmission groove 8, and a driving rack 16 meshing with the driving gear 23 is also slidably connected in the transmission groove 8. The driving rack 16 is fixedly connected to the slider 9 through the connecting rod 15, and the driving gear 23 is fixedly connected to the driven gear 19 through the rotating shaft 22. A limit rod 17 is fixedly connected to the inner wall of the mechanism box 3, and the limit rod 17 slides through the driven rack 18. It should be noted that by setting the limit rod 17, and the limit rod 17 is specifically welded by an inclined vertical rod and an inclined horizontal rod, wherein the inclined vertical rod is parallel to the guide groove 4 and the guide plate 5, and the inclined vertical rod slides through the driven rack 18, so that the driven rack 18 can be limited, so that the driven rack 18 can stably move along the direction of the guide groove 4.

[0033] Furthermore, the limiting rod 17 is a square structure, which can also prevent the driven rack 18 from rotating.

[0034] In this embodiment, if Figure 4 As shown, as the paper is transported one by one, the height of the stacked paper gradually decreases. At this time, the first spring 11 will gradually push the slider 9 and the hollow roller 13 to move downward gradually. The slider 9 can drive the active rack 16 to move downward through the connecting rod 15, and thereby drive the active gear 23 to rotate.

[0035] When the driving gear 23 rotates, it can drive the driven gear 19 to rotate through the rotating shaft 22. Figure 6 and Figure 5 As shown, when the driving gear 23 rotates, it pushes the driven rack 18 to move downward along the inclined vertical rod part of the limit rod 17, and drives the guide plate 5 to move downward along the guide groove 4 through the push rod 20, and finally makes the blocking plate 7 fixedly connected to the guide plate 5 move downward along the guide groove 4.

[0036] In this way, on the one hand, when the amount of paper on the deflection plate 2 gradually decreases, the blocking height of the blocking plate 7 on the deflection plate 2 can be gradually reduced, so that the uppermost paper can smoothly pass through the paper outlet slot 6 and the paper outlet nozzle 32; on the other hand, under the transmission action of the driving gear 23 and the driven gear 19, the vertical downward movement of the hollow roller 13 is changed into the inclined downward movement of the blocking plate 7, and at the same time, the guide plate 5, the driven rack 18 and the blocking plate 7 are arranged parallel to each other. Therefore, the force acting on the blocking plate 7 through the driven rack 18 is always along the inclined direction of the guide groove 4, so that the blocking plate 7 and the guide plate 5 can move smoothly in the direction of the guide groove 4.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic document feeder for a copying machine, comprising a document feed box (1), a deflection plate (2) and a document feed assembly, characterized in that: The deflection plate (2) is fixedly connected to the document feed box (1), and the deflection plate (2) and the document feed box (1) are arranged at an inclined angle, and the deflection plate (2) is used to hold paper to be copied; The document feed assembly is used to transport the paper on the deflection plate (2) toward the document feed box (1), and comprises a mechanism box (3), a hollow roller (13) and a plurality of negative pressure mechanisms, wherein a plurality of negative pressure holes (14) are provided on the circumferential side wall of the hollow roller (13), and the negative pressure mechanism is used to generate temporary negative pressure at each negative pressure hole (14).

2. The automatic document feeder of a copier according to claim 1, characterized in that: A transmission groove (8) is provided on the side wall of the mechanism box (3), a slider (9) is slidably connected in the transmission groove (8), a small DC motor (21) is installed on the side wall of the slider (9), and an output shaft of the small DC motor (21) is fixedly connected to the hollow roller (13).

3. The automatic document feeder of a copier according to claim 2, characterized in that: A slide bar (10) is fixedly connected to the bottom of the transmission groove (8), and the slide bar (10) slides through the slider (9). A first spring (11) is fixedly connected to the upper end of the slider (9), and the upper end of the first spring (11) is fixedly connected to the inner top of the transmission groove (8).

4. The automatic document feeder of a copier according to claim 1, characterized in that: The negative pressure mechanism comprises a negative pressure cylinder (25), a sliding plug (29), and a second spring (30), wherein the sliding plug (29) is sealingly slidably arranged in the negative pressure cylinder (25), one end of the second spring (30) is fixedly connected to the sliding plug (29), and one end of the second spring (30) away from the sliding plug (29) is fixedly connected to the inner wall of the negative pressure cylinder (25).

5. The automatic document feeder of a copier according to claim 4, characterized in that: The upper end of the slider (9) is fixedly connected to a connecting rod (12), one end of the connecting rod (12) away from the slider (9) extends into the hollow roller (13), and one end of the connecting rod (12) away from the slider (9) is fixedly connected to a guide column (28), and a side wall of the guide column (28) is provided with an arc-shaped groove (31). The sliding plug (29) is fixedly connected to a support rod (26), and one end of the support rod (26) away from the sliding plug (29) is rotatably connected to a running wheel (27), and the running wheel (27) runs along the circumferential surface of the guide column (28).

6. The automatic document feeder of a copier according to claim 1, characterized in that: Guide grooves (4) are provided on both sides of the document feed box (1), guide plates (5) are slidably connected in the guide grooves (4), blocking plates (7) are fixedly connected to the side walls of the guide plates (5), paper outlet grooves (6) are provided on the side walls of the blocking plates (7), and paper outlet nozzles (32) are fixedly connected to the side walls of the blocking plates (7), and the paper outlet nozzles (32) are communicated with the paper outlet grooves (6).

7. The automatic document feeder of a copier according to claim 6, characterized in that: A driven gear (19) is rotatably connected in the mechanism box (3), and a driven rack (18) meshing with the driven gear (19) is also slidably connected in the mechanism box (3). The driven rack (18) is fixedly connected to the guide plate via a push rod (20), and the driven rack (18) is arranged parallel to the guide plate (5) and the blocking plate (7).

8. The automatic document feeder of a copier according to claim 7, characterized in that: A driving gear (23) is rotatably connected in the transmission groove (8), and a driving rack (16) meshing with the driving gear (23) is also slidably connected in the transmission groove (8); the driving rack (16) is fixedly connected to the slider (9) via a connecting rod (15), and the driving gear (23) is fixedly connected to the driven gear (19) via a rotating shaft (22).

9. The automatic document feeder of a copier according to claim 7, characterized in that: A limit rod (17) is fixedly connected to the inner wall of the mechanism box (3), and the limit rod (17) slides through the driven rack (18).

10. The automatic document feeder of a copier according to claim 4, characterized in that: The negative pressure cylinders (25) are fixedly connected together via an annular frame (24).

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