Paper feeding mechanism and printer

Abstract

The utility model relates to a paper feeding mechanism which comprises a paper rubbing roller. A paper feeding roller; the driving mechanism is in driving connection with the paper feeding roller; the first gear set is connected with the paper rubbing roller; the second gear set is connected with the paper feeding roller; the clutch gear set can be in meshed connection between the first gear set and the second gear set in a swinging manner relative to the first gear set; the driving assembly is movably arranged on the rack, and the driving assembly is in driving association with the clutch gear set so as to drive the clutch gear set to be separated from the first gear set; the paper rubbing roller and the paper feeding roller rotate in opposite directions under the transmission action of the driving mechanism, the first gear set, the second gear set and the clutch gear set. The paper feeding mechanism can simultaneously perform paper rubbing action and paper feeding action. The utility model also relates to a printer using the paper feeding mechanism.

Description

Technical Field

[0001] The utility model relates to a paper feeding mechanism and also relates to a printer using the paper feeding mechanism. Background Art

[0002] Printers are commonly used products in daily work and life. In order to achieve paper feeding, a paper feeding mechanism is set in the printer. The paper feeding mechanism usually includes a paper feeding motor and a pickup roller and a feed roller connected to the paper feeding motor. Based on the paper feeding structure, the paper feeding action of the printer usually includes the following steps: the paper feeding motor reverses, thereby driving the pickup roller to pick up the paper, so that the paper enters the paper feeding channel. When the paper moves to the feed roller, the paper feeding motor rotates forward, the pickup roller stops picking up the paper, and at the same time drives the feed roller to feed the paper. After the tail of the current paper is separated from the feed roller, the feed motor reverses and picks up the next paper. This cycle is repeated to complete the multi-page printing task. In the above printing action steps, the next sheet of paper needs to wait until the previous sheet of paper is printed and discharged before it can start picking up the paper. This paper feeding step takes a long time, especially when performing multi-page printing, the printing efficiency is low. Utility Model Content

[0003] The first technical problem to be solved by the utility model is to provide a paper feeding mechanism capable of performing paper rubbing action and paper feeding action simultaneously in view of the above-mentioned prior art.

[0004] The second technical problem to be solved by the present invention is to provide a printer using the above-mentioned paper feeding mechanism in view of the above-mentioned prior art.

[0005] The technical solution adopted by the utility model to solve the above-mentioned first technical problem is: a paper feeding mechanism, including a pickup roller;

[0006] Feed roller;

[0007] A driving mechanism, drivingly connected to the paper feed roller;

[0008] It is characterized by: it also includes

[0009] A first gear set is connected to the pickup roller;

[0010] A second gear set is connected to the paper feed roller and is transmission-connected to the first gear set;

[0011] The pickup roller and the feed roller rotate in opposite directions under the transmission action of the driving mechanism, the first gear set and the second gear set.

[0012] When feeding the last page of paper in a printing task, the power of the paper pickup roller can be cut off to avoid unnecessary paper pickup. A clutch that can combine and separate the transmission connection between the first gear group and the second gear group is also provided between the first gear group and the second gear group.

[0013] Preferably, it further comprises a bracket, and the first gear set, the second gear set and the clutch are arranged on the bracket.

[0014] Preferably, the clutch comprises a clutch gear set and a drive assembly, wherein the clutch gear set is meshed with the second gear set and can be clutched and swung relative to the first gear set;

[0015] The driving assembly is drivingly associated with the clutch gear set to drive the clutch gear set to be clutched with the first gear set.

[0016] Preferably, the clutch gear set includes a first gear, a second gear and a first connecting seat, the first gear is centrally fixedly connected to the bracket for rotation, the first connecting seat is connected to the first gear, the first connecting seat is provided with a first connecting shaft, the second gear is sleeved on the first connecting shaft and meshes with the first gear, the bracket is provided with a guide hole matching the swing path of the second gear, and the first connecting shaft is limited in the guide hole.

[0017] The structure is simple. The driving assembly includes a pushing member, an elastic member and a driver. The pushing member is movably arranged on the bracket through the elastic member. The elastic member has a tendency to drive the pushing member to push the clutch gear set and the first gear set to separate. The driver and the pushing member can be linked to drive the pushing member to reset to the position where the clutch gear set is meshed with the first gear set.

[0018] Preferably, the driving assembly further comprises a positioner, and the positioner comprises a positioning rod which can be telescopically moved up and down;

[0019] The bracket is provided with a fixing frame moving along the clutch direction, the pushing member is fixed on the fixing frame, and the pushing member is connected to the elastic member through the fixing frame;

[0020] The fixing frame is provided with a positioning hole into which the positioning rod can be placed.

[0021] In order to avoid setting up an additional power source for driving the pusher, a rack is provided on the fixed frame, and the driver is a third gear set. The third gear set includes a third gear, a fourth gear, and a second connecting seat. The third gear is centrally fixedly connected to the bracket and is connected to a gear in the first gear set. The second connecting seat is connected to the third gear. A second connecting shaft is provided on the second connecting seat. The fourth gear is sleeved on the second connecting shaft and meshes with the third gear. The third gear is clutched and engaged with the rack on the fixed frame based on the driven swing of the fourth gear.

[0022] Preferably, the positioner is a solenoid valve, and the valve stem of the solenoid valve constitutes the positioning rod.

[0023] The technical solution adopted by the utility model to solve the second technical problem is: a printer, including a base, characterized in that it also includes the above-mentioned paper feeding mechanism, and the paper feeding mechanism is arranged on the base.

[0024] Compared with the prior art, the advantages of the present invention are: the paper feeding mechanism in the present invention realizes the relative reverse rotation of the paper feed roller and the paper pickup roller based on the transmission, so that the paper can be picked up while feeding the paper, and there is no need to wait for the tail of the previous paper to separate from the paper feed roller before picking up the paper, that is, the paper picking action and the paper feeding action are synchronized, the paper feeding efficiency is improved, and the waiting time for printing is reduced.

[0025] On this basis, the clutch can also be used to achieve the transmission clutch effect on the paper pickup roller. In this way, when printing the last page of paper in the task, the clutch can be used to cut off the power of the paper pickup roller, which reduces energy consumption on the one hand and avoids unnecessary paper feeding on the other hand.

[0026] The printer using the paper feeding mechanism has high printing efficiency and short waiting time when printing multiple pages. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a three-dimensional diagram of the printer in the embodiment of the utility model in a state of continuous printing of multiple pages.

[0028] Figure 2 for Figure 1 A partial enlarged view of .

[0029] Figure 3 for Figure 1 Another perspective of the picture.

[0030] Figure 4 for Figure 3 A partial enlarged view of .

[0031] Figure 5 It is a three-dimensional diagram of the clutch in the paper feeding mechanism in the embodiment of the utility model in a disengaged state.

[0032] Figure 6 for Figure 5 Another perspective of the picture. DETAILED DESCRIPTION

[0033] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0034] This embodiment discloses a paper feeding mechanism and a printer using the paper feeding mechanism. For simplicity, this embodiment takes a printer as an example to respectively describe the printer and the paper feeding mechanism in detail.

[0035] like Figures 1 to 6As shown, the printer in this embodiment includes a base 8 and a paper feeding mechanism arranged on the base 8. The paper feeding mechanism is used to automatically rub the paper placed in the printer into the paper feeding channel and drive the paper to move continuously until the required image is printed on the paper and then sent out of the printer.

[0036] like Figures 1 to 6 As shown, the paper feeding mechanism in this embodiment includes a paper pickup roller 1, a paper feed roller 2, a driving mechanism 3, a bracket 7, a first gear set 4, a second gear set 5, and a clutch 6.

[0037] The pickup roller 1 is rotatably disposed on the base 8 , and the pickup roller 1 has a pickup wheel that can contact the upper surface of the paper. Based on the rotation of the pickup roller 1 , the paper is driven into the paper feed channel in the printer.

[0038] The paper feed roller 2 is rotatably arranged on the base 8, and is usually arranged below the paper feed passage, that is, the paper feed roller 2 drives the paper to complete the paper feeding action by rolling contact with the lower surface of the paper. That is, when the front edge of the paper moves to the position of the paper feed roller 2 under the action of the pickup roller 1, the rotation of the paper feed roller 2 drives the paper to continue to move forward.

[0039] Since the surfaces of the pickup roller 1 and the paper feed roller 2 contacting the paper are different, when the pickup roller and the paper feed roller 2 play the corresponding paper pickup and paper feed functions, the rotation direction of the pickup roller 1 is opposite to the rotation direction of the paper feed roller 2, that is, one rotates clockwise and the other rotates counterclockwise. It is also based on this working characteristic that in the prior art, due to the provision of a set of driving mechanisms 3, the paper pickup and paper feed actions are completed in sections and cannot be performed simultaneously. The paper feeding mechanism in this embodiment can simultaneously perform the paper pickup and paper feed actions, and thus can continuously feed paper when printing multiple pages without having to stop the paper feed action in the middle to perform the paper pickup action.

[0040] The driving mechanism 3 is connected to the paper feed roller 2, and the driving mechanism 3 includes a motor and a transmission gear set connected to the driving end of the motor. The output gear of the transmission gear set is sleeved on the first end of the paper feed roller 2, so that the motor realizes the rotational drive of the paper feed roller 2 through the transmission gear set.

[0041] The bracket 7 is arranged on the base 8 and is located outside the ends of the pickup roller 1 and the feed roller 2. The first gear set 4, the second gear set 5 and the clutch 6 are all arranged on the bracket 7.

[0042] The first gear set 4 is connected to the pickup roller 1 . Specifically, the output gear of the first gear set 4 is sleeved on the end of the pickup roller 1 .

[0043] The second gear set 5 is connected to the paper feed roller 2. Specifically, the input gear of the second gear set 5 is sleeved on the second end of the paper feed roller 2. The second gear set 5 and the first gear set 4 are arranged on the same side, thereby facilitating transmission between the two.

[0044] The clutch 6 is disposed between the first gear set 4 and the second gear set 5 , and the clutch 6 can realize the coupling and separation of the transmission connection between the first gear set 4 and the second gear set 5 .

[0045] The clutch 6 in this embodiment includes a clutch gear set 61 and a drive assembly 62. The clutch gear set 61 is meshed with the second gear set 5 and can swing relative to the first gear set 4. The drive assembly 62 is drive-related to the clutch gear set 61 to drive the clutch gear set 61 to engage and disengage with the first gear set 4.

[0046] The clutch gear set 61 can be meshed and connected between the first gear set 4 and the second gear set 5 in a swinging manner relative to the first gear set 4, that is, the clutch gear set 61 and the second gear set 5 are always in meshing state, and the clutch gear set 61 and the first gear set 4 are meshed and separated from each other based on their swinging action. Specifically, when the first gear set 4 and the second gear set 5 need to transmit to each other, the clutch gear set 61 is meshed with the first gear set 4, so that the first gear set 4 and the second gear set 5 are transmitted through the clutch gear set 61, and when the driving mechanism 3 drives the paper feed roller 2 to rotate, it will correspondingly drive the second gear set 5 to rotate, and then drive the first gear set 4 to rotate through the clutch gear set 61, and also realize the driving rotation of the pickup roller 1. When there is no need to drive the rotation of the pickup roller 1, the clutch gear set 61 is separated from the first gear set 4, at this time, the first gear set 4 and the second gear set 5 are disconnected from the transmission, and the pickup roller 1 loses the power source and stops rotating.

[0047] When the clutch gear set 61 is meshed with the first gear set 4, the pickup roller 1 and the feed roller 2 rotate in opposite directions under the transmission action of the driving mechanism 3, the first gear set 4, the second gear set 5, and the clutch gear set 61. In this way, when printing multiple pages of paper, based on the transmission action of the driving mechanism 3, the first gear set 4, the second gear set 5, and the clutch gear set 61, the pickup roller 1 can pick up the paper while the feed roller 2 is feeding the paper, and the pickup roller 1 does not need to wait for the feed roller 2 to finish feeding the paper before picking up the paper, thereby ensuring continuous printing.

[0048] Because the paper rubbing action and the paper feeding action are performed simultaneously, in order to avoid unnecessary paper feeding caused by the paper rubbing action when the last page is printed, in this embodiment, the driving component 62 is used to drive the clutch gear group 61 to separate from the first gear group 4, so that only the paper feeding action can be performed without the paper rubbing action.

[0049] Specifically, the driving assembly 62 is movably disposed on the bracket 7 , and the driving assembly 62 is drivingly associated with the clutch gear set 61 to drive the clutch gear set 61 to be clutched with the first gear set 4 .

[0050] The clutch gear set 61 in this embodiment includes a first gear 611, a second gear 612 and a first connecting seat 613. The first gear 611 is centrally fixedly connected to the bracket 7 for rotation. The first connecting seat 613 is connected to the first gear 611. The first connecting seat 613 is provided with a first connecting shaft 614. The second gear 612 is sleeved on the first connecting shaft 614 and meshed with the first gear 611. The bracket 7 is provided with a guide hole 71 matching the swing path of the second gear 612, and the first connecting shaft 614 is limited in the guide hole 71. In this embodiment, based on the rotation direction of the driving mechanism 3 driving the paper feed roller 2 to perform the paper feeding action, the second gear set 5 will drive the first gear 611 to rotate. While the first gear 611 rotates, it drives the first connecting seat 613 to rotate synchronously, so that the first connecting shaft 614 rotates along the direction of the guide hole 71 toward one end of the guide hole 71. When the first connecting shaft 614 reaches the end of the guide hole 71 and cannot move, the second gear 612 is meshed with the first gear set 4. Due to the meshing transmission of the first gear 611 to the second gear 612, the second gear 612 drives the first gear set 4 to rotate while rotating, thereby driving the paper pickup roller 1 to rotate.

[0051] When the power source of the pickup roller 1 needs to be disconnected, the paper feed roller 2 still needs to continue feeding paper, so the second gear 612 cannot be separated from the first gear set 4 by reversing the driving mechanism 3. In this embodiment, the driving assembly 62 is used to push the second gear 612 so that the second gear 612 is separated from the first gear set 4.

[0052] The driving assembly 62 includes a pushing member 621, an elastic member 622 and a driver 623. The pushing member 621 is movably arranged on the bracket 7 through the elastic member 622. The elastic member 622 has a tendency to drive the pushing member 621 to push the clutch gear set 61 to separate from the first gear set 4. The driver 623 and the pushing member 621 can be linked to drive the pushing member 621 to reset to the position where the clutch gear set 61 is meshed with the first gear set 4.

[0053] The driver 623 can be selected to have an independent power source as needed, so that when the clutch gear set 61 needs to be separated from the first gear set 4, the driver 623 does not provide power, and then under the action of the elastic member 622, the driving pusher 621 interferes with the clutch gear set 61, and the driving pusher 621 pushes the clutch gear set 61 to achieve a state where the clutch gear set 61 is separated from the first gear set 4. At other times, the driver 623 drives the pusher 621 to overcome the elastic force of the elastic member 622 and move away from the clutch gear set 61 to avoid interference of the pusher 621 with the clutch gear set 61. In actual application, it is necessary to keep the non-interference state of the pusher 621 with the clutch gear set 61 for a long time, so that the driver 623 will have a high energy consumption.

[0054] In this embodiment, in order to reduce the cost and reduce the working energy consumption. The driving assembly 62 also includes a positioner 624, and the positioner 624 includes a positioning rod 6241 that can be telescopic up and down. A fixed frame 625 that moves along the clutch direction is provided on the bracket 7, and the pusher 621 is fixed on the fixed frame 625, and the pusher 621 is connected to the elastic member 622 through the fixed frame 625. A positioning hole 6251 for the positioning rod 6241 to be placed is provided on the fixed frame 625. In this way, when the driver 623 drives the pusher 621 to reset to a position that does not interfere with the clutch gear set 61, the positioning rod 6241 in the positioner 624 moves down and is inserted into the positioning hole 6251, and the positioning rod 6241 is used to lock the reset position of the pusher, thereby maintaining the non-interference state between the pusher 621 and the clutch gear set 61, and the corresponding driver 623 can also stop working. The positioner 624 in this embodiment is a solenoid valve, and the valve stem of the solenoid valve constitutes the positioning rod 6241. When the solenoid valve is energized, the positioning rod 6241 moves upward and then escapes from the positioning hole 6251 . When the solenoid valve is de-energized, the positioning rod 6241 moves downward and is inserted into the positioning hole 6251 .

[0055] In order to avoid the need to additionally set up a power source for driving the pusher 621, a rack 626 is provided on the fixed frame 625, and the driver 623 is a third gear 6231 group. The third gear 6231 group includes a third gear 6231, a fourth gear 6232, and a second connecting seat 6233. The third gear 6231 is centrally fixedly connected to the bracket 7 for rotation and is connected to a gear in the first gear group 4. The second connecting seat 6233 is connected to the third gear 6231. A second connecting shaft 6234 is provided on the second connecting seat 6233. The fourth gear 6232 is sleeved on the second connecting shaft 6234 and meshes with the third gear 6231. The third gear 6231 is engaged and disengaged from the rack 626 on the fixed frame 625 based on the driving swing of the fourth gear 6232.

[0056] The driving pusher 621 only needs to be reset before the printer performs a printing job or after completing a printing task. Therefore, the fourth gear 6232 needs to be driven to swing to a position meshing with the rack 626. No matter which direction the driving mechanism 3 is set to rotate to achieve this action, it will not affect the normal printing work of the pickup roller 1 and the paper feed roller 2. Usually, when performing this reset drive, the driving mechanism 3 needs to rotate in a direction opposite to the rotation direction during paper feeding. After the driver 623 is used to reset the pusher 621 to a non-interference position with the clutch gear set 61, the positioning rod 6241 is used to position the pusher 621, and then the driving mechanism 3 rotates forward again to reset the third gear 6231 set. At this time, the paper feeding mechanism is in the initial working state.

[0057] The working steps of the paper feeding mechanism in this embodiment include the following.

[0058] The working steps of multi-page continuous printing are as follows: the motor in the driving mechanism 3 rotates forward, the driving mechanism 3 drives the paper feed roller 2 to rotate in the paper feed direction, the paper feed roller 2 drives the second gear set 5 to rotate, the second gear set 5 drives the first gear 611 in the clutch gear set 61 to rotate, so that the first connecting shaft 614 in the first connecting seat 613 swings to the end of the guide hole 71 in the direction of the guide hole 71, and at the same time the second gear 612 meshes with the first gear set 4, thereby driving the first gear set 4 to rotate, the first gear set 4 drives the paper pickup roller 1 to rotate in the paper pickup direction, so that under the action of the paper pickup roller 1, the paper enters the paper feed channel and reaches the position of the paper feed roller 2, the paper feed roller 2 drives the paper to continue feeding, the paper pickup roller 1 continues to perform the paper pickup action, and when the tail of the paper leaves the position of the paper pickup roller 1, the paper pickup roller 1 rubs the next paper. In this way, the paper pickup and paper feeding actions are performed uninterruptedly at the same time.

[0059] For the last page in a multi-page printing task, or for a single-page printing task, the control is to energize the solenoid valve. After the solenoid valve is energized, the positioning rod 6241 is separated from the positioning hole 6251. Under the action of the elastic member 622, the push member 621 is pulled to move. The push member 621 contacts the first connecting shaft 614 and drives the first connecting shaft 614 to move in a direction away from the end position of the current guide hole 71, thereby driving the second gear 612 to separate from the first gear set 4. At this time, the second gear set 5 and the first gear set 4 cannot realize transmission, and the corresponding first gear set 4 stops rotating due to loss of power, and the pickup roller 1 stops rotating accordingly. At this time, only the feed roller 2 feeds the last page of paper, but the pickup roller 1 no longer picks up the paper, thereby avoiding unnecessary picking up the paper.

[0060] When the printing task is completed, the driving assembly 62 is activated to move the pusher 621 to a position that does not interfere with the first connecting shaft 614, and then waits for the next printing task.

[0061] The paper feeding mechanism of the present invention realizes the relative reverse rotation of the paper feeding roller 2 and the paper pickup roller 1 based on the transmission, so that the paper can be picked up while the paper is being fed, and there is no need to wait for the tail of the previous paper to separate from the paper feeding roller 2 before the paper picking action is performed, that is, the paper picking action and the paper feeding action are synchronized, the paper feeding efficiency is improved, and the waiting time for printing is reduced.

[0062] On this basis, the clutch gear set 61 can also be used to realize the transmission clutch effect of the paper pickup roller 1. In this way, when printing the last page of paper in the task, the clutch gear set 61 can be used to cut off the power of the paper pickup roller 1, which reduces energy consumption on the one hand and avoids unnecessary paper feeding on the other hand.

[0063] The printer using the paper feeding mechanism has high printing efficiency and short waiting time when printing multiple pages.

[0064] In the specification and claims of the present utility model, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A paper feeding mechanism, comprising Pick-up roller (1); Feed roller (2); A driving mechanism (3) is drivingly connected to the paper feed roller (2); Features: Also includes A first gear set (4) connected to the paper pickup roller (1); A second gear set (5) connected to the paper feed roller (2) and drivingly connected to the first gear set (4); The paper pickup roller (1) and the paper feed roller (2) rotate in opposite directions under the transmission action of the driving mechanism (3), the first gear group (4) and the second gear group (5).

2. The paper feeding mechanism according to claim 1, characterized in that: A clutch (6) is also provided between the first gear set (4) and the second gear set (5) and is capable of engaging and disengaging the transmission connection between the first gear set (4) and the second gear set (5).

3. The paper feeding mechanism according to claim 2, characterized in that: It also comprises a bracket (7), on which the first gear set (4), the second gear set (5) and the clutch (6) are arranged.

4. The paper feeding mechanism according to claim 2, characterized in that: The clutch (6) comprises a clutch gear set (61) and a drive assembly (62); the clutch gear set (61) is meshed with the second gear set (5) and can be clutched and swung relative to the first gear set (4); The driving assembly (62) is drivingly associated with the clutch gear set (61) to drive the clutch gear set (61) to be clutched with the first gear set (4).

5. The paper feeding mechanism according to claim 4, characterized in that: The clutch gear set (61) comprises a first gear (611), a second gear (612) and a first connecting seat (613); the first gear (611) is centrally fixedly rotatably connected to the bracket (7); the first connecting seat (613) is connected to the first gear (611); a first connecting shaft (614) is provided on the first connecting seat (613); the second gear (612) is sleeved on the first connecting shaft (614) and meshed with the first gear (611); a guide hole (71) matching the swing path of the second gear (612) is provided on the bracket (7); and the first connecting shaft (614) is limited in the guide hole (71).

6. The paper feeding mechanism according to claim 4, characterized in that: The driving assembly (62) comprises a pushing member (621), an elastic member (622) and a driver (623); the pushing member (621) is movably arranged on the bracket (7) via the elastic member (622); the elastic member (622) has a tendency to drive the pushing member (621) to push the clutch gear set (61) and the first gear set (4) to separate; the driver (623) and the pushing member (621) can be linked to drive the pushing member (621) to reset to a position where the clutch gear set (61) is meshed with the first gear set (4).

7. The paper feeding mechanism according to claim 6, characterized in that: The driving assembly (62) further comprises a positioner (624), wherein the positioner (624) comprises a positioning rod (6241) which can be extended upward and downward; The bracket (7) is provided with a fixing frame (625) that moves along the clutch direction, the pushing member (621) is fixed on the fixing frame (625), and the pushing member (621) is connected to the elastic member (622) through the fixing frame (625); The fixing frame (625) is provided with a positioning hole (6251) into which the positioning rod (6241) can be inserted.

8. The paper feeding mechanism according to claim 7, characterized in that: The fixing frame (625) is provided with a rack (626), and the driver (623) is a third gear (6231) group, and the third gear (6231) group includes a third gear (6231), a fourth gear (6232), and a second connecting seat (6233). The third gear (6231) is centrally fixedly connected to the bracket (7) and is connected to a gear in the first gear group (4). The second connecting seat (6233) is connected to the third gear (6231). The second connecting seat (6233) is provided with a second connecting shaft (6234). The fourth gear (6232) is sleeved on the second connecting shaft (6234) and meshes with the third gear (6231). The third gear (6231) is engaged or disengaged from the rack (626) on the fixing frame (625) based on the driving swing of the fourth gear (6232).

9. The paper feeding mechanism according to claim 7 or 8, characterized in that: The positioner (624) is a solenoid valve and the valve stem of the solenoid valve constitutes the positioning rod (6241).

10. A printer, comprising a base (8), characterized in that: It also comprises a paper feeding mechanism as claimed in any one of claims 1 to 9, wherein the paper feeding mechanism is arranged on a base (8).

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