Paper separation device and printer

Abstract

The present invention discloses a paper separation device and a printer, which are installed on a frame, and include a paper feed roller and a paper pickup device connected to the frame and suitable for being driven to rotate, wherein the paper pickup device includes a paper pickup board and a paper pickup roller; wherein a paper pickup channel for paper to pass through is formed between the paper feed roller and the paper pickup roller, and the paper pickup channel is suitable for self-adjusting its gap according to the thickness of the paper entering the paper pickup channel; the paper pickup roller is movably connected to the paper pickup board and is suitable for following the rotation or being selectively driven to rotate under the drive of the paper feed roller and the paper. The present invention can improve the accuracy of paper separation and facilitate the removal of jammed paper.

Description

Technical Field

[0001] The invention relates to a paper separation device and a printer. Background Art

[0002] At present, we need to process invoices (special VAT invoices, ordinary invoices) in separate copies. An invoice has at least two copies, which requires rubbing an invoice open one by one for separate processing. Each bill is held together by paper teeth; and after printing with a dot matrix printer (the needle in the print head hits the carbon paper to form fonts), each bill may be more closely combined.

[0003] The current paper separation method used in the self-service joint field is the three-roller method, which uses spring pressure to engage the paper pickup roller (separation roller) and the paper feed roller to separate the paper. However, this method has a small performance range and requires high spring precision. When multiple sheets of paper enter the roller, the pressure will deviate from the performance window and double feeding is likely to occur. As the roller wears, the pressure state will change, resulting in local wear of the roller and resulting in double feeding of paper, shortening the maintenance cycle, and making it inconvenient to remove jammed paper.

[0004] There is also a two-roller structure, which is simple in structure and uses a compression spring to engage the pickup roller with the feed roller. This structure separates the paper vertically, using gravity and power to transport the paper to the feed roller for separation. However, this structure has high requirements on spring precision, is sensitive to the coordination between the track gap and pressure, and is difficult to remove jammed paper. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a paper separation device which can improve the accuracy of paper separation and facilitate the removal of jammed paper.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a paper separation device, which is installed on a frame, and comprises:

[0007] A paper feeding roller connected to the frame and adapted to be driven to rotate;

[0008] The paper rubbing device comprises a rubbing paper board and a rubbing roller; wherein,

[0009] A paper pickup passage through which paper passes is formed between the paper feeding roller and the paper pickup roller, and the paper pickup passage is suitable for self-adjusting its gap according to the thickness of the paper entering the paper pickup passage;

[0010] The pickup roller is movably connected to the pickup paper board and is suitable for rotating with the paper feed roller and the paper or being selectively driven to rotate.

[0011] Furthermore, a structure is provided to realize self-adjustment of the gap of the paper pickup channel, wherein one end of the paper pickup board in the paper feeding direction is hinged to the frame, and the paper pickup roller is arranged at the other end of the paper pickup board. The paper pickup board is suitable for swinging around the hinge under the action of the paper entering the paper pickup channel to self-adjust the gap of the paper pickup channel.

[0012] Furthermore, it also includes a pickup roller rotation driving mechanism connected to the pickup roller to drive the pickup roller to rotate.

[0013] Furthermore, a specific structure of a pickup roller rotation drive mechanism is provided, and the pickup roller rotation drive mechanism comprises:

[0014] A main rotating shaft coaxially arranged with the hinged central axis of the rubbing board and connected to a rotating power source;

[0015] A secondary rotating shaft coaxially connected to the pickup roller;

[0016] A timing belt pair connects the main rotating shaft and the slave rotating shaft.

[0017] Furthermore, a torque limiter is provided in the transmission between the pickup roller rotation driving mechanism and the pickup roller.

[0018] Furthermore, it also includes a paper lifting roller that is suitable for being driven to rotate, contacts with the paper and is arranged before the pickup roller in the paper feeding direction.

[0019] Furthermore, the paper lifting roller and the paper pickup board are adapted to self-adjust the gap therebetween according to the thickness of the paper entering therebetween.

[0020] The present invention also provides a printer, which comprises the above paper separation device.

[0021] After adopting the above technical solution, the present invention has the following beneficial effects:

[0022] 1. Use the deadweight to adjust the gap and pressure of the paper pickup channel. The paper pickup channel has a certain gap (allowing a small amount of paper to pass through), and the pickup board can be turned upward and rotated through the hinge fulcrum. When paper of different thicknesses enters the channel, the pickup board will be lifted to different heights, but its pressure on the paper is always the same (the paper pickup channel automatically adjusts the gap according to the thickness of the paper);

[0023] 2. The paper separation device uses the paper feed roller and the paper lifting roller to rotate counterclockwise to transport the paper. Compared with the single paper feed roller, the combination of the paper feed roller and the paper lifting roller is more stable and has a stronger paper separation ability;

[0024] 3. The pickup paper board can also be flipped upward at any time to open the pickup channel to handle paper jams. The hinged fulcrum and the pickup roller are transmitted by a synchronous belt, and the distance is large, which will not affect the flipping of the pickup paper board, nor will it apply excess pressure to the pickup roller during the transmission of torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the paper separation device of the present invention;

[0026] Figure 2 is a three-dimensional diagram of a paper separation device of the present invention;

[0027] Figure 3 The paper separation device of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 4 The paper separation device of the present invention is shown in FIG. Figure 2 ;

[0029] Figure 5 The paper separation device of the present invention is shown in FIG. Figure 3 ;

[0030] Figure 6 This is the force diagram of each component of the paper separation device. DETAILED DESCRIPTION

[0031] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0032] Embodiment 1

[0033] like Figures 1 to 6 As shown, a paper separation device is installed on a frame and comprises:

[0034] A paper feeding roller 1 connected to the frame and adapted to be driven to rotate;

[0035] The paper picking device comprises a paper picking board 2 and a paper picking roller 3; wherein,

[0036] A paper pickup passage through which paper passes is formed between the paper feeding roller 1 and the paper pickup roller 3, and the paper pickup passage is suitable for self-adjusting its gap according to the thickness of the paper entering the paper pickup passage;

[0037] The pickup roller 3 is movably connected to the pickup paper board 2 and is adapted to rotate with or be selectively driven to rotate driven by the paper feed roller 1 and the paper.

[0038] In this embodiment, the paper guide 10 is used to guide the advancing direction of the paper.

[0039] The paper separation device uses its own weight to adjust the gap and pressure of the paper picking channel. The paper picking channel has a certain gap (allowing a small amount of paper to pass through), and the pick-up board 2 can be turned upward and rotated through a hinge fulcrum. When paper of different thicknesses enters the channel, the pick-up board 2 will be lifted to different heights, but its pressure on the paper is always the same (the pick-up channel automatically adjusts the gap according to the different thicknesses of paper);

[0040] like Figure 2 As shown, in order to realize the self-adjusting gap function of the paper pickup channel, one of the structural modes is introduced, wherein one end of the paper pickup board 2 in the paper feeding direction is hinged to the frame, and the paper pickup roller 3 is arranged at the other end of the paper pickup board 2, and the paper pickup board 2 is suitable for swinging around the hinge under the action of the paper entering the paper pickup channel to self-adjust the gap of the paper pickup channel.

[0041] The rubbing paper board 2 can also be flipped upward at any time to open the rubbing passage to handle paper jams. The hinged fulcrum and the rubbing roller are transmitted by a synchronous belt, and the distance is large, which will not affect the flipping of the rubbing paper board, nor will it apply excess pressure to the rubbing roller during the transmission of torque.

[0042] The paper separation device further comprises a pickup roller rotation driving mechanism connected to the pickup roller 3 to drive the pickup roller 3 to rotate.

[0043] Specifically, the pickup roller rotation driving mechanism may have the following structure, including:

[0044] A main rotating shaft 41 which is coaxially arranged with the hinge center axis of the rubbing board 2 and connected to a rotating power source;

[0045] A secondary rotating shaft 42 coaxially connected to the pickup roller 3;

[0046] A timing belt pair connects the main rotating shaft 41 and the slave rotating shaft 42 .

[0047] In this embodiment, the rotation power source drives the main rotating shaft 41 to rotate, the main rotating shaft 41 drives the slave rotating shaft 42 to rotate through the synchronous belt pair, and the slave rotating shaft 42 drives the pickup roller 3 to rotate.

[0048] The synchronous belt pair includes a synchronous belt 51 , a main synchronous wheel and a slave synchronous wheel. The main synchronous wheel is connected to the main rotating shaft 41 , and the slave synchronous wheel is connected to the slave rotating shaft 42 .

[0049] Specifically, a torque limiter 5 is provided in the transmission between the pickup roller rotation driving mechanism and the pickup roller 3 .

[0050] In this embodiment, the paper separation device further includes a paper lifting roller 100 adapted to be driven to rotate, in contact with the paper, and arranged before the pickup roller 3 in the paper feeding direction. The paper extraction roller is before the pickup roller 3, and the paper first passes through the paper extraction roller 100 and then passes through the pickup roller 3; the paper separation device uses the paper feed roller 1 and the paper lifting roller 100 to rotate counterclockwise to transport the paper. Compared with the single paper feed roller 1, the combination of the paper feed roller 1 and the paper lifting roller 100 is more stable and has a stronger paper separation ability.

[0051] Specifically, the paper lifting roller 100 and the paper pickup board 2 are adapted to self-adjust the gap therebetween according to the thickness of the paper entering therebetween.

[0052] Specifically, taking triple-joint paper as an example: the friction coefficient between the paper and the roller is μ 1 , the friction coefficient between paper and paper μ 2 The friction coefficient between the rollers is μ 3 , the positive pressure of the pickup paper board 2 is Fn, the radius of the pickup roller 3 is r, and a torque limiter 5 is provided between the pickup roller 3 and the secondary rotating shaft 42, and its torque is T; the torque T is constant.

[0053] Friction between paper and paper feed roller 1: f1 = μ 1 Fn;

[0054] Friction between paper and paper: f2 = μ 2 Fn;

[0055] Friction between rollers: f3 = μ 3 Fn;

[0056] Torque of pickup roller 3: f4 = T / r;

[0057] Take three-part paper as an example. When three-part paper enters together, due to μ 1 >μ 2 That is, f1>f2, the paper feed roller 1 rotates counterclockwise to drive the third sheet of paper forward; when μ 2 When Fn<T / r (i.e. f2<f4), the third copy is separated, and the second copy is the same. When Fn is too large or T is too small, μ2Fn>T / r (i.e. f2>f4), three copies of paper are sent out together. This phenomenon is called double feeding and is an abnormal phenomenon. Figure 5 shown.

[0058] When there is no paper, the paper feed roller 1 rotates counterclockwise, and the paper feed roller 1 meshes with the pickup roller 3. 3 Fn>T / r (i.e. f3>f4), at this time, the friction between the rubber rollers is greater than the torque provided by the torque limiter, and the inner ring of the torque limiter slips, so the pickup roller 3 is driven by the feed roller 1 to rotate clockwise, such as Figure 3 shown.

[0059] When there is only one piece of paper, when μ 1 Fn>T / r (i.e. f1>f4), the paper feed roller 1 rotates counterclockwise to drive the paper forward. At this time, the friction between the paper and the rubber roller is greater than the constant torque provided by the torque limiter, the inner ring of the torque limiter slips, and the pickup roller 3 is driven by the paper to rotate clockwise. Figure 4 shown.

[0060] exist Figure 4 and Figure 5 A in the figure stands for paper.

[0061] In summary, the matching relationship between Fn and T determines whether the paper can be fed out. The Fn of the traditional structure changes with the entry of paper of different thicknesses, and it is difficult to adjust the size of Fn; in this embodiment, Fn uses the deadweight of the sheet metal, so when different papers enter the channel, the size of Fn remains constant. Figure 6 shown.

[0062] Embodiment 2

[0063] A printer comprises the paper separation device of the first embodiment.

[0064] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0065] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0068] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0069] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A paper separation device, which is mounted on a frame, characterized in that: It includes: A paper feeding roller (1) connected to the frame and adapted to be driven to rotate; A paper rubbing device, the paper rubbing device comprising a paper rubbing board (2) and a paper rubbing roller (3); wherein: A paper pickup passage through which paper passes is formed between the paper feeding roller (1) and the paper pickup roller (3), and the paper pickup passage is suitable for self-adjusting its gap according to the thickness of the paper entering the paper pickup passage; The pickup roller (3) is movably connected to the pickup paper board (2) and is adapted to rotate with or be selectively driven to rotate under the drive of the paper feed roller (1) and the paper; One end of the pickup paper (2) in the paper feeding direction is hinged to the frame, and the pickup roller (3) is arranged at the other end of the pickup paper (2). The pickup paper (2) is suitable for swinging around the hinge under the action of the paper entering the pickup channel to self-adjust the gap of the pickup channel. It also includes a pickup roller rotation drive mechanism connected to the pickup roller (3) to drive the pickup roller (3) to rotate; A torque limiter (5) is provided in the transmission between the pickup roller rotation drive mechanism and the pickup roller (3); It also includes a paper lifting roller (100) adapted to be driven to rotate, in contact with the paper and arranged before the paper pickup roller (3) in the paper feeding direction; The paper lifting roller (100) and the paper rubbing board (2) are adapted to self-adjust the gap between them according to the thickness of the paper entering therebetween.

2. The paper separation device according to claim 1, characterized in that: The pickup roller rotation driving mechanism comprises: A main rotating shaft (41) coaxially arranged with the hinge center axis of the rubbing board (2) and connected to a rotating power source; A secondary rotating shaft (42) coaxially connected to the pickup roller (3); A synchronous belt pair connecting the main rotating shaft (41) and the slave rotating shaft (42).

3. A printer, characterized in that: It comprises a paper separation device as claimed in any one of claims 1 to 2.

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