WO2011140929A1

WO2011140929A1 - Printer

Info

Publication number: WO2011140929A1
Application number: PCT/CN2011/073481
Authority: WO
Inventors: 刘凯; 郑磊; 姜天信; 韩智华; 马春光
Original assignee: 山东新北洋信息技术股份有限公司
Priority date: 2010-05-14
Filing date: 2011-04-28
Publication date: 2011-11-17
Also published as: CN102241202A; CN102241202B

Abstract

A printer comprises a main frame (1), a movable frame (2) hinged on the main frame (1) in order to be opened or closed relative to the main frame (1), a paper storage (5) set on the main frame (1) for holding web, a printing mechanism (6) set downstream the paper storage (5) along a web-conveying direction, and a first paper-conveying mechanism (7) set in a first paper-passing passage along the web-conveying direction and located downstream the printing mechanism (6). The printing mechanism (6) includes a printing platen (61) connected to the movable frame (2), and a printing head (62) connected to the main frame (1). The first paper-conveying mechanism (7) includes a driving roller (71) connected to the movable frame (2), and a driven roller component (72) connected to the main frame (1). The driven roller component (72) which has first and second positions relative to the main frame (1), is movably connected to the main frame (1). In the first position the driven roller component (72) cooperates with the driving roller (71) and in the second position the driven roller component (72) is away from the drive roller (71). The printer has the convenience of replacing printing mediums and performing the maintenance work such as cleaning the printing head (62) and so on.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to the field of printing, and in particular to a printer. BACKGROUND OF THE INVENTION A conventional stylus receipt printer is mainly used in supermarkets, shopping malls, banks, and the like for printing invoices, receipts, and transaction logs on a web. In recent years, with the promotion of check applications, supermarkets, shopping malls, banks and other fields not only need to print transaction receipts, but also need to print endorsements or confirmation messages on the check. Therefore, there is a kind of ability to support both web and sheet of paper. The printed printer can be used to print a receipt or log and check the print function of a printer. Figure 1 illustrates a conventional receipt log and check printer. As shown, the printer includes a relatively disposed printhead and print pad that form a print path therebetween. In the paper conveying direction, a first conveying roller 1 for conveying a sheet of paper is disposed upstream of the printing head 4a, and a second conveying roller 2 for conveying the web is disposed downstream of the printing head 4a. The sheet of paper is fed from the first inlet of the printer to the printing channel through the first conveying roller 1 and discharged from the first outlet 5; the web is fed from the internal paper bin 3 of the printer, into the printing channel, and through the second conveying roller 2, The second outlet 6 is discharged. In order to facilitate the smooth discharge of the sheet from the printing path, the second conveying roller 2 must be located on the side of the printing path downstream of the printing pad 4b, thereby dividing the downstream of the printing into two paper exits. Therefore, the second conveying roller 2 hinders the printing pad 4b from opening and closing with respect to the dot matrix printing head 4a. Under the influence of the second conveying roller 2, the printing pad 4b of the printer is usually fixedly arranged with respect to the dot matrix printing head 4a, which completely closes the printing channel, thereby causing a problem of complicated operation of replacing the medium, and is disadvantageous for handling the paper jam. , cleaning the print head, etc. maintenance work. In view of the complicated operation of the printer replacement medium in the related art, and it is not conducive to the problem of handling the paper jam, cleaning the print head, etc., an effective solution has not been proposed yet. SUMMARY OF THE INVENTION The present invention has been made in view of a problem that the printer replacement medium is complicated in operation and is disadvantageous for handling maintenance work such as jamming, cleaning of the print head, etc. Therefore, it is a primary object of the present invention to provide a printer to solve the above problems. In order to achieve the above object, according to an aspect of the invention, a printer is provided. A printer according to the present invention comprises: a main frame; a movable frame hinged to the main frame to open or close relative to the main frame; a paper bin accommodating the web, disposed on the main frame; a printing mechanism, transported along the web The printing mechanism is disposed at a downstream of the paper bin; and the first paper feeding mechanism is disposed in the first paper feeding path along the web conveying direction and located downstream of the printing mechanism, wherein the printing mechanism comprises: a printing pad, and the movable The frame is connected; and the print head is connected to the main frame, and the first paper feeding mechanism comprises: a driving roller connected to the movable frame; a driven roller assembly connected to the main frame, wherein the driven roller assembly and the main frame are Actively coupled and the driven roller assembly has a first position and a second position relative to the main frame, wherein, in the first position, the driven kiosk assembly cooperates with the active kun, and in the second position, the driven kuan assembly is remote from the driving roller . Further, the driven roller assembly includes: a bracket movable through a guide groove provided on one of the main frame and the bracket and a guide post disposed on the other of the main frame and the bracket and slidably engaged with the guide groove Attached to the main frame; the driven roller is disposed on the bracket; and the elastic member is disposed between the bracket and the main 4 truss such that the driven yoke assembly has the first position and the second position relative to the main frame. Further, the first outlet is located between the active and the slave; the second outlet is located between the slave and the printhead. Further, when the movable frame is opened relative to the main frame, the movable frame drives the bracket to move by the elastic member to drive the driven key to move away from the printing pad relative to the main frame. Further, the bracket comprises: a left side plate and a right side plate; the connecting plate extends along the width direction of the paper bin, one end is connected with the left side plate, and the other end is connected with the right side plate, wherein the driven roller is mounted on the connecting plate, The bracket is movably connected to the main frame through the left side plate and the right side plate, respectively. Further, the guide post is disposed on the left side plate surface and the right side plate surface, and the guide groove is disposed on the main frame. Further, a cam guiding surface is further disposed on a surface of the left side plate and the right side plate facing the driving roller, the cam guiding surface includes a guiding inclined surface and a limiting groove, and a finite column is further disposed in the main frame, wherein the limiting column edge The cam guiding surface contacts the movement and cooperates with the limiting groove when the driven roller assembly is in the second position. Further, the guiding groove is disposed longitudinally along the side of the main frame, and the elastic member is disposed within an angle defined by the extending direction of the guiding groove and the pressing direction of the cam guiding surface facing the limiting post. Further, a movable plate is further disposed on the movable 411 frame, wherein the pressing plate corresponds to the guiding column, and is configured to push the guiding column to move along the guiding groove, so that when the movable frame is closed relative to the main frame, the movable frame passes The bracket and the resilient member move the driven roller assembly from the second position to the first position. Further, the printer further includes: a second paper feeding passage for conveying a single sheet of paper, disposed under the printing head; and a second paper feeding mechanism disposed in the second paper feeding passage, comprising: a first pair of conveying rollers , located at the paper feed end of the second paper path; the second pair of transport rollers is located at one end of the second paper path adjacent to the printing mechanism. Further, one end of the movable frame is hinged to the main frame through a rotating shaft, and the other end is engaged with the main frame by a locking mechanism. By the invention, the printer with the above structure is used, which solves the problem that the printer replacement medium is complicated in operation, and is not suitable for handling the maintenance work such as the paper jam and the cleaning print head, thereby achieving the effect of facilitating the replacement of the printing medium and the maintenance work such as cleaning the print head. . BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a receipt log and a check printer according to the related art; FIG. 2 is a schematic view showing the internal structure of the printer according to an embodiment of the present invention; FIG. 3 is a longitudinal sectional view of the printer shown in FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 5 is a schematic structural view of a printer driven roller assembly according to an embodiment of the present invention; FIG. 6a is a left side plate and a main frame of a printer driven roller bracket according to an embodiment of the present invention; Figure 6b is a schematic view showing the assembly of the right side plate and the main frame of the driven roller holder of the printer according to an embodiment of the present invention; 7 is a schematic view showing a state of a driven roller assembly when a movable frame of the printer is closed with respect to a main frame according to an embodiment of the present invention; and FIG. 8 is a driven roller assembly when the movable frame of the printer is opened relative to the main frame according to an embodiment of the present invention; State diagram. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. 2 is a schematic view showing the internal structure of a printer according to an embodiment of the present invention; and FIG. 3 is a schematic cross-sectional view of the printer shown in FIG. As shown in FIGS. 2 and 3, the printer comprises: a main frame 1; a movable frame 2, hinged to the main frame 1 by a hinge to open or close relative to the main frame 1; a paper bin 5 accommodating the web, set On the main frame 1, the printing mechanism 6 is disposed downstream of the paper bin 5 in the web conveying direction, and the printing mechanism 6 includes: a printing pad 61 connected to the movable frame 2, the printing head 62, and the main frame 1 phase connection, when the movable frame 2 is closed with respect to the main frame 1, the printing pad is opposite to the printing head, and the driving roller is tangentially matched with the driven roller; when the movable frame 2 is opened relative to the main frame 1, the printing pad The plate moves with the movable frame and is separated from the printhead. As shown in FIG. 2 and FIG. 3, the printer further includes: a first paper feeding mechanism 7 disposed in the first paper feeding path along the web conveying direction and located downstream of the printing mechanism 6, the first paper feeding mechanism 7 includes: an active Kun 71, connected to the movable 4 truss 2; a driven Kun component 72 connected to the main frame 1. Wherein, the driven kiosk assembly 72 is movably coupled to the main frame 1 and the driven kiosk assembly 72 has a first position and a second position relative to the main frame 1, wherein in the first position, the driven kun assembly 72 cooperates with the active Kun 71. In the second position, the driven Kunlun component 72 is away from the active Kun 71. Wherein, in the second position, the driven carriage assembly 72 is remote from the drive roller 71 such that the distance of the print pad 61 relative to the outermost end of the hinge to the hinge is less than or equal to the distance from the driven roller assembly 72 to the hinge. Therefore, when the movable frame 2 is opened, the driven roller assembly 72 is located at the second position, so that the printing pad 61 can be avoided, and the printing pad 61 can be smoothly opened with the movable frame 2 about the hinge. The following description will be made by taking a needle printing device as an example. For clarity of display, the housing covering the outer surface of the internal structure of the printer is not shown in FIG. Figure 3 is a longitudinal cross-sectional view of the printer of Figure 2. The main structure of the printer provided by the embodiment of the present invention will be described below with reference to FIGS. 2 and 3. As shown, the printer includes a main frame 1 and a movable frame 2. The movable frame 2 is supported by the main frame 1 , and one end thereof is hinged to one end of the main frame 1 in the longitudinal direction by the rotating shaft 3 , and the other end thereof is engaged with the middle portion of the main frame 1 through the locking mechanism 4 , and the locking mechanism 4 is operated by The moving frame 2 can be opened or closed with respect to the main frame 1. On the side of the longitudinal direction of the main frame 1, corresponding to the lower side of the movable frame 2, there is provided a paper bin 5 for accommodating a roll paper, the paper bin 5 is generally an arc-shaped groove, and the reel can be stored in the arcuate groove paper. Downstream of the paper bin 5, a printing mechanism 6 for printing images and characters is provided. The printing mechanism 6 includes a print pad 61 and a pin print head 62, wherein the print pad 61 is fixedly coupled to the movable frame 2, and the pin print head 62 is mounted on the main frame 1. The print pad 61 extends in the web width direction and has a support portion 61a for supporting the printing paper. When the movable frame 2 is closed with respect to the main frame 1, the supporting portion 61a of the printing pad 61 is opposed to the end face of the stylus print head 62, and a printing passage is formed therebetween. Downstream of the printing mechanism 6, a first paper feed mechanism (or transport mechanism) 7 for transporting the web is provided. The first paper feed mechanism 7 includes a drive roller 71 and a follower roller assembly 72. The active stick 71 is located downstream of the printing pad 61 and is fixedly connected to the movable frame 2; the driven mounting assembly 72 is movably connected with the main frame 1, including the driven stick 721, the bracket 722 and the elastic member 723. The driven stick 721 is movably connected to the main frame 1 through the bracket 722 and the elastic member 723, and has a working position (ie, a first position) tangentially associated with the active quilt 71 and a non-working position of the escaping printing pad 61 (ie, Two positions). When the movable truss 2 is closed relative to the main frame 1, the driven stick 721 is tangentially engaged with the active stick 61 to form a first paper feed path for transporting the web. Therefore, when the movable frame 2 is closed with respect to the main frame 1, a roll paper (such as a receipt or an invoice or a log) is input into the printing path by the paper bin 5, and is driven by the first roller 71 and the driven roller 721. The paper discharge port P1 provided downstream of the paper mechanism 7 is discharged. A sheet of paper (such as a check) is inserted into the print path by the paper feed port P2 provided between the driven roller 721 and the needle print head 62, between the roll paper and the print head, and the print path is completed with the roll paper. , and taken out by the paper inlet P2. It should be noted that the present embodiment is suitable for the case where the mark information is printed at a specific position of the sheet, since the sheet does not need to be moved when printing, therefore, the paper feed mechanism of the sheet is not provided, and the paper feed port P2 is inserted. The sheet of paper is taken out, which simplifies the structure of the printer and reduces the cost of the apparatus. For the case where the sheet is required to be moved during printing, the second sheet feeding path D for conveying the sheet may be provided on the other side in the longitudinal direction of the main frame 1 corresponding to the lower side of the needle print head 62. As shown in Figure 4. The paper feed end of the second paper feed path D is connected to the first paper feed port P3, and the paper discharge end thereof communicates with the paper feed end of the print path. A second paper feed mechanism 8 for conveying a sheet of paper is provided in the second paper path D. The second paper feeding mechanism 8 includes at least one pair of conveying rollers. Preferably, the second paper feeding mechanism 8 in the embodiment includes a first pair of conveying rollers 81 and a second pair of conveying rollers 82, two sets of conveying rollers, wherein the first pair The conveying stick 81 is located at the paper feed end of the second paper path D, and the second pair of transport rollers 82 is located at one end of the second paper path D adjacent to the printing mechanism 6. Thus, the sheet of paper is fed into the second paper feed path D by the first paper feed port P3, driven by the second paper feed mechanism 8, and enters the print path. After the printing mechanism 6 finishes printing, it is located at the follower stick 721 and the needle. The paper feed port P2 provided between the print heads 62 is out of the printer. The following is a detailed description of how the slave can be movably connected to the main frame via the brackets in conjunction with FIGS. 5 and 6. The bracket 722 includes a left side panel a, a right side panel b, and a connecting panel c. The connecting plate c extends along the width direction of the paper bin 5, one end of which is fixedly connected with the left side plate a, the other end is fixedly connected with the right side plate b, and the left side plate a and the right side plate b are symmetrically arranged along the center line of the length of the connecting plate c . The driven roller 721 is fixedly coupled to the connecting plate c, and can move synchronously with the connecting plate c. The left side plate a and the right side plate b are connected to the main frame 1, so that the driven roller 721 can be fitted or separated from the driving roller 71. FIG. 6 shows the connection relationship between the left side plate a and the main frame 1 by taking the left side plate a as an example. As shown in the figure, the surface of the left side plate a is provided with a guide post a1 and a cam guiding surface a2, and correspondingly, a guiding groove lal and a limit which are matched with the guiding post a1 and the cam guiding surface a2 are provided on the corresponding surface of the main frame 1 Position post la2. The guide post a1 is perpendicular to the surface of the left side plate a, and is inserted and fitted with the guide groove lal provided corresponding to the main frame 1. The guiding groove lal is longitudinally disposed along the side surface of the main frame 1, and its width is matched with the diameter of the guiding column a1, and the length thereof is larger than the diameter of the guiding column a1, and the guiding column a1 can slide along the longitudinal direction of the guiding shaft. The cam guiding surface a2 is open downward, and includes a guiding slope a22 and a limiting groove a21. The limiting slot a21 is adjacent to the guiding post a1 and has a circular arc shape matched with the limiting post la2. The guiding slope a22 is a straight line segment, one end of which is connected to the limiting slot a21, and the other end of which extends away from the limiting slot a21. The elastic member 723 is connected to the main frame 1 and the other end is connected to the left side plate a. Under the elastic force of the elastic member 723, the left side plate a has a tendency to move upward along the guide groove lal. Similarly, on the right side plate b, along the center line of the length of the connecting plate c, the guiding column b1 and the cam guiding surface b2 are symmetrically arranged with the left side plate a, and correspondingly, the corresponding surface of the main frame 1 is provided with the guiding column bl a guide groove lbb and a limit post lb2 that cooperate with the cam guiding surface b2. The connection relationship between the right side plate b and the main frame 1 is the same as that of the left side plate, and will not be described here. An elastic member 723 is also disposed between the right side plate b and the main frame 1, and the elastic member 723 is connected to the main frame 1 and the other end is connected to the right side plate b. Under the elastic force of the elastic member 723, the right side plate b has a tendency to move upward along the guide groove lbl. The bracket 722 is movably coupled to the main frame 1 by a guide groove provided on the main frame 1 and a guide post provided on the bracket 722 and slidably engaged with the guide groove. The elastic member 723 is disposed between the bracket 722 and the main frame 1, and the elastic member is disposed within an angle defined by the direction in which the guide groove extends and the direction in which the cam guide faces the pressing direction of the limiting post. By the elastic force of the elastic member and the pressure between the cam guiding surface and the limiting post, the driven roller assembly 72 has the above-described first position and relative to the main frame 1 by the displacement change between the cam guiding surface and the limiting post. Second position. The working principle of the driven roller of the printer provided by the embodiment of the present invention will be described below with reference to FIG. 7 and FIG. Figure 7 is a schematic view showing the position of the bracket when the movable frame is closed with respect to the main frame. As shown in the figure, a first pressure plate 21 is disposed on the movable frame 2 at a position corresponding to the guide post a1 of the left side plate a, and during the movable 411 frame closing process, the first pressure plate 21 is pressed to the left side. The guide post a of the plate a moves the elastic force of the squeezing elastic member 723 downward along the guiding groove lal. When the movable frame 2 reaches the set position, the guiding column a1 of the left side plate a is located at the bottom end of the guiding groove lal. At the same time, the cam guiding surface a2 of the left side plate a is engaged with the limiting post la2 of the main frame 1. Similarly, a second pressure plate 22 is disposed on the movable frame 2 at a position corresponding to the guide post bl of the right side plate b. During the closing of the movable frame 2, the second pressure plate 22 presses the guide column of the right side plate b. Bl, causing the elastic force of the elastic member 723 to move downward along the guiding groove lbl. When the movable frame 2 reaches the set position, the guiding column bl of the right side plate b is located at the bottom end of the guiding groove lb1, and at the same time, the right side The cam guiding surface b2 of the plate b is engaged with the limiting post lb2 of the main frame 1. When the movable frame 2 reaches the set position, the movable frame 2 is engaged with the middle portion of the longitudinal direction of the main frame 1 by the locking mechanism 4, and is fixedly coupled to the main frame 1. At this time, the supporting portion 61a of the printing pad 61 is opposed to the end surface of the dot print head 62, and the driven shutter 721 is placed in close contact with the active lens. Due to jt匕, the driven 3⁄4 721 can be stabilized with the active Kun 71 under the action of the bracket 722 ^. Thus, the roll paper is fed into the printing path by the paper bin 5, and is discharged by the paper discharge port P1 provided downstream of the paper feed mechanism by the driving of the active cylinder 71 and the driven cylinder 721. The sheet of paper is inserted into the printing path by the paper inlet P2 provided between the driven roller 721 and the needle print head 62, between the web and the dot print head 62, and is printed with the common paper print path of the web. And taken out by the paper inlet P2. When the movable 4 truss 2 is opened relative to the main frame 1, during the process of opening the movable device 2, the active quilt 71 and the printing pad 61 move with the movable frame 2, gradually with the driven stick 721 and the needle. The print head 62 is separated; the first platen 21 and the second platen 22 are gradually separated from the guide post a1 of the left side plate a and the guide post b1 of the right side plate b. At this time, under the elastic force of the left side plate a and the right side plate b and the elastic member 723, the guiding columns a1 and bl move upward along the longitudinal direction of the guiding grooves lal and lb1, so that the limiting grooves a21 and b22 of the cam guiding surface thereof The limiting posts la2 and lb2 of the main frame 1 are separated, so that the bracket 722 drives the driven platen 721 to move away from the printing pad 61. When the limiting slots a21 and b22 are separated from the limiting posts la2 and lb2, The guiding slopes a22 and b21 are overlapped with the limiting columns la2 and lb2, and the left side plate a is supported on the limiting columns la2 and lb2. Therefore, during the opening process of the printing pad 61, the bracket 722 moves relative to the main frame 1 away from the printing pad 61 under the action of the elastic member 723, so that the driven kun 721 moves to avoid the non-printing pad 61. work location. In the above embodiment, the driven roller of the paper feeding mechanism for conveying the web is movably coupled to the printer fixing frame, and has a working position tangentially with the driving roller and an inoperative position for avoiding the printing pad. When the movable frame is closed relative to the main frame, the driven roller and the driving roller are tangentially engaged to form a first paper feed path for conveying the web. When the movable frame is opened relative to the main frame, the driven roller moves in a direction away from the printing pad, so that the printing pad can be smoothly opened without causing any trouble with the driven roller. This allows the print path to be completely open for easy media replacement, handling of paper jams, and cleaning of printheads. From the above description, it can be seen that the present invention can achieve the purpose of facilitating replacement of the medium, handling of the paper jam, cleaning of the print head, and the like. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim A book, characterized in that it comprises:

Main frame (1);

a movable frame (2) hinged to the main frame (1) to be opened or closed relative to the main frame (1) 4;

a paper bin (5) for accommodating the web, disposed on the main frame (1);

The printing mechanism (6) is disposed downstream of the paper bin (5) along the web conveying direction, and includes:

a print pad (61) connected to the movable frame (2); and a print head (62) connected to the main frame (1)

The first paper feeding mechanism (7) is disposed in the first paper path along the web conveying direction and located downstream of the printing mechanism (6), and includes:

a driving roller (71) connected to the movable frame (2);

a driven roller assembly (72) connected to the main frame (1),

Wherein the driven roller assembly (72) is movably coupled to the main frame (1) and the driven roller assembly (72) has a first position and a second position relative to the main frame (1) In the first position, the driven roller assembly (72) and the driving roller (71) cooperate, and in the second position, the driven cylinder assembly (72) is away from the active Kun (71). The printer according to claim 1, wherein said driven roller assembly (72) comprises:

a bracket (722) passing through a guide groove provided on one of the main frame (1) and the bracket (722) and disposed in both the main frame (1) and the bracket (722) Another guide post that is slidably engaged with the guide groove is movably coupled to the main frame (1);

a driven roller (721) disposed on the bracket (722);

a resilient member (723) disposed between the bracket (722) and the main frame (1) such that the driven manifold assembly (72) has the first portion relative to the main 4-truss (1) Position and the second position.

3. The printer according to claim 2, further comprising:

a first outlet (P1) between the driving roller (71) and the driven roller (721);

A second outlet (P2) is located between the driven roller (721) and the printhead (62).

4. The printer according to claim 2, wherein the movable frame (2) passes through the elastic member when the movable frame (2) is opened relative to the main frame (1) 723) driving the bracket (722) to move the driven cylinder (721) relative to the main truss

(1) Move away from the print pad (61).

5. The printer according to claim 2, wherein the bracket (722) comprises: a left side panel (a) and a right side panel (b);

a connecting plate (c) extending in a width direction of the paper bin (5), one end connected to the left side plate (a), and the other end connected to the right side plate (b),

Wherein the driven roller (721) is mounted on the connecting plate (c), and the bracket (722) passes through the left side plate (a) and the right side plate (b) and the main frame (1) Activity connection.

6. The printer according to claim 5, wherein the guide post is disposed on a surface of the left side plate (a) and the surface of the right side plate (b), and the guide groove is disposed at the On the main frame (1).

7. The printer according to claim 6, wherein a cam guiding surface is further provided on a surface of the left side plate (a) and the right side plate (b) facing the driving roller (71) The cam guiding surface includes a guiding slope and a limiting slot, and a limiting post is further disposed on the main frame (1), wherein the limiting post is in contact movement along the cam guiding surface, and the driven roller assembly (72) mating with the limit slot when in the second position.

8. The printer according to claim 5, wherein a pressure plate is further disposed on the movable frame (2), wherein the pressure plate corresponds to the guide column, and the guide plate is used for 4 dancing. Moving the column along the guiding groove such that when the movable frame ( 2 ) is closed relative to the main frame ( 1 ), the movable frame ( 2 ) passes through the bracket ( 722 ) and the elasticity The element (723) drives the driven roller assembly (72) to move from the second position to the first position.

9. The printer according to claim 1, further comprising:

a second paper path for conveying a sheet of paper, disposed below the print head (62); a second paper feeding mechanism (8) disposed in the second paper path, comprising: a first pair of transporting rollers (81) located at a paper feed end of the second paper feed passage; and a second pair of transport rollers (82) located in the second paper path adjacent to one end of the printing mechanism (6). The printer according to claim 1, wherein the movable frame (2) is hinged to the main frame (1) via a rotating shaft (3), and the other end is coupled to the main body (1) by a locking mechanism (4) The main frame (1) is engaged.