Portable printer with manual cutter

Abstract

The utility model relates to the technical field of portable printers, and discloses a portable printer with a manual cutter, which comprises a lower cover and a middle frame, the middle frame is transversely mounted above the lower cover, a flip cover is assembled behind the top of the middle frame, a protective cover is mounted behind the top of the flip cover, and a manual cutter is mounted on the protective cover. A cutter sliding button is installed between the two sides of the interior of the front end of the protective cover, and a blade is installed below the cutter sliding button. According to the portable printer with the manual cutter, a blade is installed below a cutter sliding button, a cutter assembly is provided with the cutter sliding button which is exposed at the top of a flip cover, a protective cover protects a cutter sliding structure, cutter lock pins lock the cutter assembly at the two ends when the flip cover is opened, and a paper outlet channel is formed in the middle of the spliced flip cover assembly and a surface cover. A fixed cutter arranged on the surface cover is opposite to the cutter assembly on one side of the paper outlet channel, a blade transversely penetrates through the paper outlet and is in lap joint with the fixed cutter to cut paper in the paper outlet channel, and the problem that cutting is inconvenient is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of portable printers, in particular to a portable printer with a manual cutter. Background Art

[0002] A printer is an output device that can retrieve files from a computer or mobile phone through instructions and print them on paper or plastic surfaces for use. However, previous laser and inkjet printers were bulky and difficult to carry around, and were unable to quickly export the corresponding paper rolls, making them quite limited in use.

[0003] Portable printers usually print on roll paper, which is a continuous long paper. The printed content varies in length, so the paper needs to be cut. Moreover, the roll paper is in a curled state and is still bent after printing. It should be pressed for a while before it can be flattened. There is a lack of balance between cutting and sorting.

[0004] Now, a novel portable printer with a manual cutter is proposed to solve the above problems. Utility Model Content

[0005] The purpose of the present utility model is to provide a portable printer with a manual cutter to solve the problem of inconvenience in cutting mentioned in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a portable printer with a manual cutter, comprising a lower cover and a middle frame, the middle frame being installed horizontally above the lower cover, and a flip cover being assembled at the rear of the top of the middle frame, a protective cover being installed at the rear of the top of the flip cover, a cutter slide button being installed between the two sides inside the front end of the protective cover, and a blade being installed below the cutter slide button, a face cover being assembled at the front of the top of the middle frame, a paper bin being provided at the center of the inner side of the middle frame, and paper width adjustment blocks being mounted on both sides of the front end of the paper bin, a rubber roller assembly being installed between the two sides inside the front end of the flip cover, and a fixed knife being assembled horizontally at the rear of the rubber roller assembly, and a main circuit board being assembled inside the face cover.

[0007] Preferably, a lock pin is assembled between the front and back of the right side of the flip cover, and an unlocking component is assembled on the top of the lock pin, a cutter component is assembled at the front end of the lock pin, and sliding openings are provided at the front ends of both sides of the middle frame, and a cover opening sliding button is inserted in the sliding opening.

[0008] Preferably, function buttons are installed on the left front of the lower cover, and a USB interface is installed on the right side of the lower cover.

[0009] Preferably, a reverse bending channel is formed between the paper bin and the middle frame, and a paper feeding channel is arranged transversely between the front of the flip cover and the face cover.

[0010] Preferably, a bottom plate is placed horizontally inside the lower cover, and side plates are installed on both sides of the bottom plate. The center of the outside of the side plate is dedicated to an unlocking arm, and a locking block is provided at the center of the rear of the unlocking arm. A stop block is provided at the bottom behind the unlocking arm, and an auxiliary circuit board is assembled on the right side of the top of the bottom plate.

[0011] Preferably, a motor is installed on the left side of the base plate, and a planetary reducer is assembled on the left side of the motor, and a battery assembly is installed at the center of the front end of the base plate.

[0012] Preferably, a slider is movably connected to the center of the rear end of the base plate, and a connecting rod is fixed to the left side of the slider, the outer sides of the rear ends of the side panels are equipped with rocker arms, a print head assembly is installed at the center between one side of the side panels, a shift rod is installed above the inner wall of the side panel, top arms are installed on both sides of the print head assembly, and a hooking portion is provided above the top arm.

[0013] Compared with the prior art, the beneficial effects of the present invention are: the portable printer with a manual cutter not only realizes fast cutting of paper rolls and flattening of paper rolls, but also realizes easy disassembly and assembly;

[0014] (1) A blade is installed under the cutter slide button, and the cutter assembly can be slidably arranged in the flip cover. When the cutter assembly slides to both ends, the blade retracts into the flip cover. When the cutter assembly slides away from both ends, the blade extends out of the flip cover. The cutter assembly is provided with a cutter slide button exposed at the top of the flip cover. A protective cover is also provided on the top of the flip cover to protect the cutter sliding structure. A cutter lock pin and a spring are provided at both ends of the flip cover. The cutter lock pin locks the cutter assembly at both ends when the flip cover is opened. The face cover assembly is provided with a fixed knife and a main circuit board. A paper outlet channel is provided in the middle of the splicing of the flip cover assembly and the face cover. The fixed knife provided on the face cover is opposite to the cutter assembly on one side of the paper outlet channel. The blade of the cutter assembly crosses the paper outlet and overlaps with the fixed knife to cut the paper in the paper outlet channel;

[0015] (2) A paper feed channel is provided transversely between the front of the flip cover and the face cover, and a paper bin and a paper width adjustment block are provided in the middle frame; when the flip cover is closed, a reverse bending channel is formed with the middle frame, and the reverse bending channel bends the curled paper in the reverse direction so that the paper is straight after printing. At both ends of the printing channel, the middle frame 6 is provided with paper width adjustment blocks, which can adjust the width of the paper feed channel to adapt to papers of different widths, thereby avoiding the need to press the printed paper later;

[0016] (3) A bottom plate is placed horizontally inside the lower cover, and the printing assembly is arranged between the two side plates. A hook assembly is arranged between the two sides of the printing assembly and the side plates. The hook assembly includes a hook shaft and hooks at both ends. A hook portion is provided at one end of the hook, and a lever is provided at the other end. The side plates are provided with a U-shaped groove, and the hook portion and the U-shaped groove form a semi-enclosed space; the flip cover is hinged at both ends of the movement frame, away from the side of the rotating shaft, and the flip cover is provided with a rubber roller assembly. When the cover is closed, the two ends of the rubber roller are stuck in the semi-enclosed space, and the rubber roller contacts the print head. The position where the rubber roller contacts the print head is set below the above-mentioned paper output channel; a top arm is provided on the inner side of the side plate, and the upper side of one end of the top arm contacts the rubber roller, and the lower side contacts the hook lever. The other end of the arm is provided with a return spring; a cover-opening sliding button is provided on the outer side of the side plate and is connected to one end of the hook-engaging portion of the card hook. When the cover-opening sliding button is slid, the hook rotates the hooking portion away from the semi-enclosed space, and the toggle lever toggles the top arm to move upward and pushes the rubber roller out of the semi-enclosed space, thereby realizing the cover opening. When the above-mentioned cutter assembly slides to both ends of the flip cover, the cutter retracts into the inside of the flip cover. When the cutter assembly slides out of both ends, the cutter extends and overlaps the fixed knife to cut paper. After the cutter is extended, if the flip cover can still be opened, not only will the cutter be damaged, but also a safety accident may occur. Therefore, a cutter protection mechanism is required, that is, when the cutter is extended, the flip cover cannot be opened. The flip cover can be opened for operation only when the cutter slides to both ends and retracts into the inside of the flip cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the front three-dimensional structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the front exploded structure of the present utility model;

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the flip cover of the present invention when viewed from above;

[0020] Figure 4 This is a bottom-view three-dimensional structural diagram of the middle frame of the present invention;

[0021] Figure 5 This is a schematic diagram of the rear-view stereoscopic structure of the side panel of the present invention;

[0022] Figure 6 It is a side cross-sectional structural schematic diagram of the utility model.

[0023] In the figure: 1. Lower cover; 2. Function button; 3. Slide; 4. Open cover slider; 5. USB port; 6. Middle frame; 7. Flip cover; 8. Protective cover; 9. Paper feed path; 10. Cutter slider; 11. Top cover; 12. Unlocking assembly; 13. Paper bin; 14. Paper width adjustment block; 15. Unlocking arm; 16. Locking block; 17. Stop block; 18. Bottom plate; 19. Side plate; 20. Auxiliary circuit board; 21. Planetary reducer; 22. Motor; 23. Battery assembly; 24. Main circuit board; 25. Fixed knife; 26. Blade; 27. Rubber roller assembly; 28. Cutter assembly; 29. Locking pin; 30. Rocker arm; 31. Connecting rod; 32. Slider; 33. Print head assembly; 34. Top arm; 35. Lever; 36. Hooking part; 37. Reverse bending channel. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example 1: Please refer to Figure 1-6 A portable printer with a manual cutter includes a lower cover 1 and a middle frame 6. The middle frame 6 is installed horizontally above the lower cover 1, and a flip cover 7 is installed at the top and rear of the middle frame 6. A protective cover 8 is installed at the rear of the top of the flip cover 7. A cutter slide button 10 is installed between the two sides of the front inner side of the protective cover 8, and a blade 26 is installed below the cutter slide button 10. A cover 11 is installed at the front of the top of the middle frame 6. A paper bin 13 is provided at the center of the inner side of the middle frame 6, and paper width adjustment blocks 14 are installed on both sides of the front end of the paper bin 13. A rubber roller assembly 27 is installed between the two sides of the inner front end of the flip cover 7, and a fixed knife 25 is installed horizontally behind the rubber roller assembly 27. A main circuit board 24 is assembled inside the cover 11.

[0026] A lock pin 29 is assembled between the front and back of the right side of the flip cover 7, and the top of the lock pin 29 is assembled with an unlocking assembly 12. The front end of the lock pin 29 is assembled with a cutter assembly 28. The front ends of both sides of the middle frame 6 are provided with sliding openings 3, and the sliding openings 3 are inserted into the cover opening buttons 4. The function button 2 is installed on the left front of the lower cover 1, and the USB port 5 is installed on the right side of the lower cover 1.

[0027] Specifically, if Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown, the cutter assembly 28 is slidably arranged in the flip cover 7. When the cutter assembly 28 slides to both ends, the blade 26 retracts into the flip cover 7. When the cutter assembly 28 slides away from both ends, the blade 26 extends out of the flip cover 7. The cutter assembly 28 is provided with a cutter slide button 10 exposed at the top of the flip cover 7. A protective cover 8 is also provided on the top of the flip cover 7 to protect the cutter sliding structure. Cutter lock pins 29 and springs are provided at both ends of the flip cover 7. The cutter lock pins 29 lock the cutter assembly 28 at both ends when the flip cover 7 is opened. The face cover 11 assembly is provided with a fixed knife 25 and a main circuit board 24; a paper discharge channel is provided in the middle of the splicing of the flip cover 7 assembly and the face cover 11, and the fixed knife 25 provided on the face cover 11 is opposite to the cutter assembly 28 on one side of the paper discharge channel. The blade 26 of the cutter assembly 28 crosses the paper discharge port and overlaps with the fixed knife 25 to cut the paper in the paper discharge channel, thereby realizing fully automatic paper discharge and cutting.

[0028] Example 2: A reverse bending channel 37 is formed between the paper bin 13 and the middle frame 6, and a paper feeding channel 9 is arranged transversely between the front of the flip cover 7 and the surface cover 11;

[0029] Specifically, if Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, the middle frame 6 is equipped with a paper bin 13 and a paper width adjustment block 14. When the flap 7 is closed, it forms a reverse bending channel 37 with the middle frame 6. The reverse bending channel 37 bends the curled paper in the opposite direction, making the paper straight after printing. At both ends of the printing channel, the middle frame 6 is equipped with paper width adjustment blocks 14 to adjust the width of the paper feed channel 9 to accommodate paper of different widths, avoiding the need to press the printed paper.

[0030] Example 3: A bottom plate 18 is placed horizontally inside the lower cover 1, and side plates 19 are installed on both sides of the bottom plate 18. The center of the outer side plate 19 is dedicated to the unlocking arm 15, and a locking block 16 is provided at the center of the rear of the unlocking arm 15. A stopper 17 is provided at the bottom of the rear of the unlocking arm 15. An auxiliary circuit board 20 is assembled on the right side of the top of the bottom plate 18;

[0031] A motor 22 is mounted on the left side of the base plate 18, and a planetary reducer 21 is mounted on the left side of the motor 22. A battery assembly 23 is mounted at the center of the front end of the base plate 18. A slider 32 is movably connected to the center of the rear end of the base plate 18, and a connecting rod 31 is fixed to the left side of the slider 32. Rocker arms 30 are mounted on the outer sides of the rear ends of the side plates 19. A print head assembly 33 is mounted at the center between one side of the side plates 19. A lever 35 is mounted above the inner wall of the side plates 19. Top arms 34 are mounted on both sides of the print head assembly 33, and a hooking portion 36 is provided above the top arms 34.

[0032] Specifically, if Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, the printing assembly is arranged between the two side panels 19, and a hook assembly is arranged between the two sides of the printing assembly and the side panels 19. The hook assembly includes a hook shaft and hooks at both ends. One end of the hook is provided with a hooking portion 36, and the other end is provided with a lever 35; the side panels 19 are provided with a U-shaped groove, and the hooking portion 36 and the U-shaped groove form a semi-enclosed space; the flip cover 7 is hinged at both ends of the movement frame, away from the side of the rotating shaft, and the flip cover 7 is provided with a rubber roller assembly 27. When the cover is closed, the two ends of the rubber roller are stuck in the semi-enclosed space, and the rubber roller and the print head are pressed against each other. The contact position between the rubber roller and the print head is set below the above-mentioned paper output channel; a top arm 34 is provided on the inner side of the side plate 19, and the upper side of one end of the top arm 34 abuts against the rubber roller, and the lower side abuts against the hook lever 35, and a return spring is provided at the other end of the top arm 34; an opening slide button 4 is provided on the outer side of the side plate 19 and is connected to one end of the hook engagement portion 36 of the hook. When the opening slide button 4 is slid, the hook rotates the hook engagement portion 36 away from the semi-enclosed space, and the lever 35 drives the top arm 34 to move upward and push the rubber roller out of the semi-enclosed space, thereby realizing opening the cover.

[0033] Working principle: When the present invention is in use, the lower cover 1 is provided with a function button 2, and the inner side of the function button 2 is against the electronic switch provided on the auxiliary circuit board 20; a USB interface 5 is also provided at one end of the lower cover 1 for charging or data transmission, and a surrounding recess is provided between the lower cover 1 and the surface cover 11 and the flip cover 7. The cover opening button extends out of the outside of the recess and is protected by the surface cover 11 and the lower cover 1 above and below to prevent it from being broken; and because the lower cover 1 is separated from the surface cover 11 and the flip cover 7 by the recess, even if there are external tolerances of the lower cover 1, the surface cover 11 and the flip cover 7, it will not affect the aesthetics of the external joint. The printing assembly is arranged between the two side panels 19, and a hook assembly is arranged between the two sides of the printing assembly and the side panels 19. The hook assembly includes a hook shaft and hooks at both ends. One end of the hook is provided with a hooking portion 36, and the other end is provided with a lever 35; the side panels 19 are provided with a U-shaped groove, and the hooking portion 36 and the U-shaped groove form a semi-enclosed space; the flip cover 7 is hinged at both ends of the movement frame, away from the side of the rotating shaft, and the flip cover 7 is provided with a rubber roller assembly 27. When the cover is closed, the two ends of the rubber roller are stuck in the semi-enclosed space, and The rubber roller contacts the print head, and the contact position between the rubber roller and the print head is set below the above-mentioned paper discharge channel; a top arm 34 is provided on the inner side of the side plate 19, and the upper side of one end of the top arm 34 contacts the rubber roller, and the lower side contacts the hook lever 35, and a return spring is provided on the other end of the top arm 34; an opening slide button 4 is provided on the outer side of the side plate 19 and is connected to one end of the hook engagement portion 36 of the hook. When the opening slide button 4 is slid, the hook rotates the hook engagement portion 36 away from the semi-enclosed space, and the lever 35 moves the top arm 34 upward, and the rubber roller is moved out of the semi-enclosed space. When the cutter assembly 28 slides to both ends of the flip cover 7, the cutter is retracted into the inside of the flip cover 7. When the cutter assembly 28 slides out of both ends, the cutter is extended to overlap with the fixed knife 25 to cut paper. If the flip cover 7 can still be opened after the cutter is extended, it will not only damage the cutter but also may cause a safety accident. Therefore, a cutter protection mechanism is required, that is, when the cutter is extended, the flip cover 7 cannot be opened. The flip cover 7 can be opened only when the cutter slides to both ends and retracts into the inside of the flip cover 7. The cover 7 is operated, and the internal cutter protection mechanism includes a touch rod, a connecting rod 31, and a connecting rod 31 slider 32; the touch rod is arranged on both sides of the movement frame and is rotatably connected to the side plate 19, and the touch rod is provided with a spring reset, and a connecting rod 31 slider 32 is provided in the middle of the movement frame, and a connecting rod 31 is provided between the touch rod and the connecting rod 31 slider 32, so that the touch rods on the left and right sides are connected by the connecting rod 31 and can be synchronously opened or reset outward; the touch rod is provided with a locking block 16, a stop block 17, and an unlocking arm 15.The locking block 16 abuts against the top arm 34, so that the top arm 34 is locked, and the touch rod unlocking arm 15 extends upward and abuts against the cutter assembly 28. When the cutter assembly 28 slides to both ends, the touch rod unlocking arm 15 is pushed outward, so that the locking block 16 withdraws from the top arm 34, releasing the lock on the top arm 34 to restore the cover opening function. When the flip cover 7 is opened, the cutter assembly 28 is separated from the touch rod unlocking arm 15, and the touch rod will naturally return to its original position. When the flip cover 7 is closed again, the cutter assembly 28 interferes with the touch rod unlocking arm 15, resulting in a cover closing failure. Therefore, the cutter protection mechanism also includes a rocker arm 30; the rocker arm 30 is hinged to the movement frame. The rotating shaft of the flip cover 7 is provided with a protrusion that abuts the rocker arm 30. When the flip cover 7 is opened, the protrusion pushes one end of the rocker arm 30 under the bumper bar stopper 17 to prevent the bumper bar from naturally returning to its original position. When the flip cover 7 is closed again, the cutter assembly 28 abuts against the bumper bar unlocking arm 15 again. The bumper bar is provided with a return spring. When the flip cover 7 is closed, the bumper bar returns to its original position and moves away from under the stopper 17. When the cutter is pushed out of both ends, the bumper bar can naturally return to its original position and lock against the top arm 34. When the flip cover 7 is opened, the cutter assembly 28 is pushed out of both ends, and the blade 26 extends out of the outside of the flip cover 7, which will not only damage the cutter when the cover is closed, but also may cause a safety accident.

[0034] A cutter lock pin 29 and a spring are provided inside the flip cover 7; an unlocking block 16 is provided on the middle frame 6; when the flip cover 7 is closed, the lock pin 29 contacts the unlocking block 16 and is in a retracted state. When the flip cover 7 is opened, the lock pin 29 is pushed out by the spring and locks the cutter assembly 28 at the positions at both ends, so that the cutter assembly 28 cannot slide away from the positions at both ends when the cover is opened. The cutter action sensor provided on the auxiliary circuit board 20 detects the opening and resetting of the touch bar. When the touch bar is opened, the cutter assembly 28 is at both ends. When the touch bar is reset, the cutter assembly 28 is in a slid-out state, which is very safe. The cutter assembly 28 can be slidably provided in the flip cover 7. When the cutter assembly 28 slides to both ends, the blade 26 retracts the flip cover 7 Inside, when the cutter assembly 28 slides away from both ends, the blade 26 extends out of the flip cover 7. The cutter assembly 28 is provided with a cutter slide button 10 exposed at the top of the flip cover 7. A protective cover 8 is also provided on the top of the flip cover 7 to protect the cutter sliding structure. Cutter lock pins 29 and springs are provided at both ends of the flip cover 7. The cutter lock pins 29 lock the cutter assembly 28 at both ends when the flip cover 7 is opened. The face cover 11 assembly is provided with a fixed knife 25 and a main circuit board 24; a paper discharge channel is provided in the middle of the splicing of the flip cover 7 assembly and the face cover 11. The fixed knife 25 provided on the face cover 11 is opposite to the cutter assembly 28 on one side of the paper discharge channel. The blade 26 of the cutter assembly 28 crosses the paper discharge port and overlaps with the fixed knife 25 to cut the paper in the paper discharge channel.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A portable printer with a manual cutter, comprising a lower cover (1) and a middle frame (6), characterized in that: A middle frame (6) is installed horizontally above the lower cover (1), and a flip cover (7) is installed at the rear of the top of the middle frame (6). A protective cover (8) is installed at the rear of the top of the flip cover (7). A cutter slide button (10) is installed between the two sides of the front end of the protective cover (8), and a blade (26) is installed below the cutter slide button (10). A face cover (11) is installed at the front of the top of the middle frame (6). A paper bin (13) is provided at the center of the inner side of the middle frame (6), and paper width adjustment blocks (14) are installed on both sides of the front end of the paper bin (13). A rubber roller assembly (27) is installed between the two sides of the front end of the inner side of the flip cover (7), and a fixed knife (25) is installed horizontally behind the rubber roller assembly (27). A main circuit board (24) is assembled inside the face cover (11).

2. A portable printer with a manual cutter according to claim 1, characterized in that: A lock pin (29) is assembled between the front and rear of the right side of the inside of the flip cover (7), and an unlocking assembly (12) is assembled on the top of the lock pin (29). A cutter assembly (28) is assembled on the front end of the lock pin (29). The front ends of both sides of the middle frame (6) are provided with sliding openings (3), and a cover opening sliding button (4) is inserted in the sliding openings (3).

3. The portable printer with a manual cutter according to claim 1, characterized in that: A function button (2) is installed on the left front of the lower cover (1), and a USB interface (5) is installed on the right side of the lower cover (1).

4. The portable printer with a manual cutter according to claim 1, characterized in that: A reverse bending channel (37) is formed between the paper bin (13) and the middle frame (6), and a paper feeding channel (9) is arranged transversely between the front of the flip cover (7) and the surface cover (11).

5. The portable printer with a manual cutter according to claim 1, characterized in that: A bottom plate (18) is placed horizontally inside the lower cover (1), and side plates (19) are installed on both sides of the bottom plate (18). The center of the outside of the side plate (19) is specially provided with an unlocking arm (15), and a locking block (16) is provided at the rear center of the unlocking arm (15). A stop block (17) is provided at the bottom of the rear of the unlocking arm (15). An auxiliary circuit board (20) is assembled on the right side of the top of the bottom plate (18), a motor (22) is installed on the left side of the bottom plate (18), and a planetary reducer (21) is installed on the left side of the motor (22). A battery assembly (23) is installed at the center of the front end of the bottom plate (18).

6. The portable printer with a manual cutter according to claim 1, characterized in that: A slider (32) is movably connected to the center of the rear end of the bottom plate (18), and a connecting rod (31) is fixed to the left side of the slider (32). The outer sides of the rear ends of the side plates (19) are equipped with rocker rods (30). A print head assembly (33) is installed at the center between one side of the side plates (19). A shift rod (35) is installed above the inner wall of the side plates (19). Top arms (34) are installed on both sides of the print head assembly (33), and a hooking portion (36) is provided above the top arm (34).

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