Paper feeding device of digital printer

Abstract

The invention provides a digital printer paper feeding device, and relates to the technical field of printer paper feeding, the digital printer paper feeding device comprises a placement box, a paper outlet is formed in the outer wall of the top of one side of the placement box, two sets of limiting frames are symmetrically and slidably mounted in the paper outlet, a placement frame is arranged in the placement box, and the placement frame comprises four sets of right-angle frames; compared with the prior art, paper is stacked in the containing frame, the containing frame can adjust the width and the length of the containing frame by itself to meet the requirement for existence of different pieces of paper, meanwhile, the two limiting frames of the paper outlet can synchronously adjust the distance, and therefore the containing frame can be used for containing different pieces of paper. According to the paper feeding device, the paper can be fed out according to the currently used paper length, paper conveying can be guided and limited, two sets of friction wheels of the push-out assembly can rub the upper end and the lower end of the paper correspondingly, the stacked paper is separated, and the problem that the fed-out paper is overlapped is solved.

Description

Technical Field

[0001] The invention relates to the technical field of printer paper feeding, in particular to a digital printer paper feeding device. Background Art

[0002] Digital printers, also known as universal flatbed printers and curved printers, can print any material and irregular soft and hard objects. They are widely used in the toy industry, glass products industry, and advertising industry. When the printer is printing, the paper needs to be tidied by the paper feed mechanism to facilitate the paper feed through the printer's paper guide wheel.

[0003] Existing digital printers are usually used for batch printing. Usually, the papers are stacked and placed in a paper storage box in advance. When in use, they are transported one by one by a paper wheel for printing. In this process, two or more sheets are prone to overlap, and they will be fed into the printer together by the paper wheel for printing, which will lead to paper waste. At the same time, the paper placement space equipped with existing printers is not convenient for adjusting the size of the paper. While keeping the paper aligned and limited, the paper can be accurately fed into the printer. However, there is a lack of limiting measures in the process, and papers of different sizes are prone to offset during transportation. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a paper feeding device for a digital printer to solve the problems raised in the above-mentioned background technology. The present invention has a novel structure, and the paper is stacked inside the placement frame. The placement frame can adjust its width and length by itself to meet the existence of different papers. At the same time, the two limit frames of the paper outlet will synchronously adjust the spacing to adapt to the length of the paper currently in use for delivery. The paper delivery can be guided and limited. The two sets of friction wheels of the ejection component can rub the upper and lower ends of the paper respectively, so as to separate the stacked papers and avoid the problem of overlapping of the delivered papers.

[0005] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical scheme: a paper feeding device of a digital printer comprises a placement box, a paper outlet is opened on the top outer wall of one side of the placement box, and two groups of limit frames are symmetrically and slidably installed inside the paper outlet, a placement frame is arranged inside the placement box, and the placement frame comprises four groups of right-angle frames, and the four groups of right-angle frames symmetrically form a square, and two groups of supporting plates are symmetrically arranged at the bottom of the right-angle frame, a connecting component is arranged on the outer side of the placement frame, and the connecting component comprises a telescopic column, and the telescopic column has four groups respectively set up on both sides of the placement frame, and the two ends of the supporting plate are fixedly connected to the extended ends of the telescopic column, an ejection component is arranged on the upper end surface of the placement frame, and the ejection component comprises an upper friction wheel, and upper friction wheels are arranged at the middle positions of the two sides of the upper end of the placement frame, a bottom plate is arranged at the lower end of the placement box, a handle is fixed at the bottom of the bottom plate, and the bottom plate is connected to the placement frame, and a rear cover is rotatably installed at the bottom of the back of the placement box through a hinge.

[0006] Furthermore, the placement frame also includes a slide seat, the bottom of the right-angle frame is fixed with a slide seat, and the slide seat is slidably sleeved on the top of the corresponding support plate, the two ends of the two groups of support plates are fixed with a first telescopic plate, and the two right-angle sides of the adjacent right-angle frames are slidably plugged with plug plates.

[0007] Furthermore, bolts are engaged and inserted at the outer side of the slide seat and the receiving end of the first telescopic plate, and the bolts are respectively in compression contact with the support plate and the extended end of the first telescopic plate.

[0008] Furthermore, a telescopic rod is fixed at the center of the top of the bottom plate, and a push plate is fixed to the extended end of the telescopic rod. A spring is sleeved on the periphery of the telescopic rod, and both ends of the spring are fixedly connected to the push plate and the bottom plate.

[0009] Furthermore, a vertical plate is fixed to one end of the limit frame close to the placement frame, and a sliding sleeve is slidably sleeved on the surface of the vertical plate, a second telescopic plate is fixed to the position of the outer wall of the right-angle frame corresponding to the sliding sleeve, and the extended end of the second telescopic plate is fixedly connected to the sliding sleeve, and a sliding rail is fixed to the bottom of the placement box for the positions of the two groups of vertical plates, and the bottom of the vertical plate slides along the sliding rail.

[0010] Furthermore, the connecting assembly also includes a connecting rod, connecting rods are fixed at the four corners of the bottom plate, and the top of the connecting rod is fixedly connected to the extended end of the telescopic column, a sliding frame is slidably installed on the inner wall of the top of the placement box corresponding to the positions of the telescopic columns on both sides, and a slider is symmetrically slidably connected inside the sliding frame, the top of the telescopic column is fixedly connected to the slider, two groups of third telescopic plates are provided between the two groups of sliding frames, and the two ends of the third telescopic plate are fixedly connected to the two sliders.

[0011] Furthermore, outlets are provided at the tops of the two right-angle frames on the side of the placement frame facing the paper outlet, and a pressing plate is fixed on the top of the right-angle frame, and there is a certain gap between the pressing plate and the outlet of the right-angle frame.

[0012] Furthermore, the ejection assembly also includes a connecting frame, a connecting frame is fixed on one side of the limit frame facing the upper friction wheel, and the upper friction wheel is installed at the bottom of the other end of the connecting frame, and a lower friction wheel is installed at the middle position of the paper outlet corresponding to the top exit end of the placement frame, and the lower friction wheel corresponds to the gap between the pressure plate and the right-angle frame.

[0013] Furthermore, paper conveying wheels are installed on the upper and lower sides of the other end of the limiting frame, and the paper conveying wheel, the lower friction wheel and the upper friction wheel are all driven by a motor.

[0014] Furthermore, the connecting frame is in a T-shaped structure, and the connecting frame bypasses the top of the third telescopic plate.

[0015] Beneficial effects of the present invention:

[0016] 1. The present invention allows two telescopic columns on the same side to slide along the sliding frame through the top slider, thereby adjusting the width of the placement frame. During the adjustment process, the first telescopic plate of the placement frame cooperates to extend and retract, and the right-angle frame and the plug plate are slidably plugged to maintain the connectivity of the four groups of right-angle frames. When the position of the right-angle frame is adjusted along the support plate, the slider, the sliding frame and the telescopic column move synchronously through the connection of the third telescopic plate, maintaining the connection with the right-angle frame while adjusting the length of the placement frame. Therefore, while the telescopic column always maintains the connection with the placement frame, through the connection of the connecting rod, the placement frame can be pulled downward when the bottom plate is opened to move it out of the placement box, which is convenient for stacking paper and adjusting the length and width of the placement frame.

[0017] 2. In the present invention, when the width of the right-angle frame is adjusted, the second telescopic plate is extended or shortened to keep the connection between the sliding sleeve and the vertical plate. When the length of the right-angle frame is adjusted, the connection between the sliding sleeve and the vertical plate drives the limit frame to move along the inside of the paper outlet, and the bottom of the vertical plate slides along the slide rail, so as to always keep the spacing of the limit frame the same as the length of the delivery outlet of the placement frame, limit and guide the delivered paper, and when the placement frame is pulled downward along the telescopic column, the sliding sleeve slides downward along the vertical plate, and the connection between the placement frame and the limit frame can still be maintained.

[0018] 3. The present invention drives the uppermost paper to be sent out from the outlet of the placement frame through the upper friction wheel, and the lower friction wheel is turned on to contact the lower surface of the paper. When the sent-out papers are overlapped, the upper paper is rubbed by the upper friction wheel and moves toward the paper outlet, and the lower paper is retracted into the placement frame by the friction force of the lower end, thereby separating the overlapped papers.

[0019] 4. The present invention adjusts the position of the right-angle frame by sliding the slide along the support plate, thereby adjusting the length of the placement frame, and maintaining the width of the placement frame by adjusting the first telescopic plate to meet the storage and use of papers of different sizes. After the size is determined, it is locked by bolts to keep the size of the placement frame unchanged.

[0020] 5. Compared with the prior art, the present invention stacks the papers inside the placement frame, and the placement frame can adjust its width and length by itself to meet the needs of different papers. At the same time, the two limit frames of the paper outlet will synchronously adjust the spacing to adapt to the length of the paper currently in use for delivery. The paper delivery can be guided and limited. The two sets of friction wheels of the ejection assembly can rub the upper and lower ends of the paper respectively, thereby separating the stacked papers and avoiding the problem of overlapping of the delivered papers. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the outlet end of a paper feeding device of a digital printer of the present invention;

[0022] Figure 2 It is a schematic diagram of the back and internal structure of a placement box of a paper feeding device of a digital printer of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the connecting components of a paper feeding device of a digital printer of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of a placement frame of a paper feeding device of a digital printer of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of an ejection component of a paper feeding device of a digital printer of the present invention;

[0026] Figure 6 A schematic diagram of the positional relationship between an ejection component and a connection component of a paper feeding device of a digital printer of the present invention;

[0027] Figure 7 The present invention is a schematic diagram of the paper outlet structure of a paper feeding device of a digital printer.

[0028] In the figure: 1. placement box; 11. paper outlet; 12. limit frame; 13. bottom plate; 14. handle; 15. paper conveying wheel; 16. back cover; 2. placement frame; 21. right-angle frame; 22. plug board; 23. support plate; 24. slide seat; 25. bolt; 26. first telescopic plate; 27. telescopic rod; 28. spring; 29. ​​push plate; 210. pressure plate; 211. vertical plate; 212. sliding sleeve; 213. slide rail; 214. second telescopic plate; 3. connecting assembly; 31. telescopic column; 32. connecting rod; 33. slider; 34. third telescopic plate; 35. slide frame; 4. ejection assembly; 41. connecting frame; 42. lower end friction wheel; 43. upper end friction wheel. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0030] See also Figures 1 to 7 The present invention provides a technical solution: a paper feeding device for a digital printer, comprising a placement box 1, a paper outlet 11 is provided on the top outer wall of one side of the placement box 1, and two groups of limit frames 12 are symmetrically slidably installed inside the paper outlet 11, a placement frame 2 is provided inside the placement box 1, and the placement frame 2 includes four groups of right-angle frames 21, and the four groups of right-angle frames 21 symmetrically form a square, and two groups of support plates 23 are symmetrically provided at the bottom of the right-angle frame 21, and a connecting component 3 is provided on the outside of the placement frame 2, and the connecting component 3 includes a telescopic column 31, and the telescopic column 31 has four groups respectively set on both sides of the placement frame 2, and the two ends of the support plate 23 are fixedly connected to the extended end of the telescopic column 31, and a push-out component 4 is provided on the upper end surface of the placement frame 2, and the push-out component 4 includes The upper friction wheel 43 is enclosed, and the middle positions of the two sides of the upper end of the placement frame 2 are provided with upper friction wheels 43. The lower end of the placement box 1 is provided with a bottom plate 13, and a handle 14 is fixed at the bottom of the bottom plate 13, and the bottom plate 13 is connected to the placement frame 2. The back bottom of the placement box 1 is rotated by a hinge and a back cover 16 is installed. When using the device, the paper outlet 11 of the placement box 1 corresponds to the printing station of the printer, the bottom plate 13 is pulled out by the handle 14, and the back cover 16 is opened, and the paper is stacked inside the placement frame 2. The placement frame 2 pre-adjusts the length and width to adapt to the storage and use of papers of different sizes, and then the placement frame 2 is pushed back into the placement box 1, and the top layer of paper is pushed out from between the two limit frames 12 of the paper outlet 11 by the pushing component 4, and sent to the printer for printing.

[0031] In this embodiment, the placement frame 2 also includes a slide 24, and the slide 24 is fixed to the bottom of the right-angle frame 21, and the slide 24 is slidably sleeved on the top of the corresponding support plate 23. First telescopic plates 26 are fixed at both ends of the two groups of support plates 23, and plug-in plates 22 are slidably inserted into the two right-angle sides of the adjacent right-angle frames 21. Bolts 25 are engaged and inserted at the outer side of the slide 24 and the storage end port of the first telescopic plate 26, and the bolts 25 are respectively pressed and contacted with the extended ends of the support plate 23 and the first telescopic plate 26. The slide 24 slides along the support plate 23 to adjust the position of the right-angle frame 21, thereby adjusting the length of the placement frame 2, and the width of the placement frame 2 is adjusted by the first telescopic plate 26 to meet the storage and use of papers of different sizes. After the size is determined, it is locked by the bolts 25 to keep the size of the placement frame 2 unchanged.

[0032] In this embodiment, a telescopic rod 27 is fixed at the center of the top of the bottom plate 13, and a push plate 29 is fixed to the extended end of the telescopic rod 27. A spring 28 is sleeved on the periphery of the telescopic rod 27, and both ends of the spring 28 are fixedly connected to the push plate 29 and the bottom plate 13. The placement frame 2 is provided with an outlet at the top of the two right-angle frames 21 on the side of the paper outlet 11. A pressure plate 210 is fixed on the top of the right-angle frame 21, and there is a certain gap between the pressure plate 210 and the outlet of the right-angle frame 21. The ejection assembly 4 also includes a connecting frame 41. The limit frame 12 is fixed with a connecting frame 41 on the side facing the upper friction wheel 43, and the upper friction wheel 43 is fixed with the connecting frame 41. The wheel 43 is installed at the bottom of the other end of the connecting frame 41. The middle position of the paper outlet 11 corresponds to the top outlet end of the placement frame 2 and is equipped with a lower friction wheel 42. The lower friction wheel 42 corresponds to the gap between the pressure plate 210 and the right-angle frame 21. The upper and lower sides of the other end of the limit frame 12 are equipped with conveying paper wheels 15. The conveying paper wheels 15, the lower friction wheel 42 and the upper friction wheel 43 are all driven by a motor. The connecting frame 41 is in a T-shaped structure, and the connecting frame 41 bypasses the top of the third telescopic plate 34. After the paper is stacked inside the placement frame 2, the bottom is supported by two sets of support plates 23, and the telescopic rod 27 and the push plate 29 squeezes the bottom of the paper, and the uppermost paper is limited by the pressure plate 210, corresponding to the position of the outlet of the placement frame 2, and the upper friction wheel 43 drives the uppermost paper to be sent out from the outlet of the placement frame 2. In this process, the lower friction wheel 42 is opened and contacts the lower surface of the paper. When the sent out paper is overlapped, the upper paper is rubbed by the upper friction wheel 43 and moves toward the paper outlet 11, and the lower paper is retracted into the placement frame 2 by the friction force of the lower end (the lower friction wheel 42 is not always opened, and can be opened intermittently. In this case, when there is overlapped paper, the excess paper can be sent back to the placement frame 2, when there is no stacked paper, it is intermittently opened, and it will not affect the normal transportation of paper through the upper friction wheel 43 too much. This part can also be manually controlled. The upper friction wheel 43 and the lower friction wheel 42 are both anti-static rubber wheels). As the paper is transported, the telescopic rod 27 and the spring 28 at the lower end squeeze the paper to move upward, and the position of the outlet of the placement frame 2 is used to keep the pre-sent paper. The structure of the connecting frame 41 can avoid movement interference when the placement frame 2 moves up and down. When the paper passes through the two sets of limit frames 12 and is sent out, the paper is sent to the printing station of the printer through the paper conveying wheel 15.

[0033] In this embodiment, a vertical plate 211 is fixed to one end of the limit frame 12 close to the placement frame 2, and a sliding sleeve 212 is slidably sleeved on the surface of the vertical plate 211. A second telescopic plate 214 is fixed to the position of the outer wall of the right-angle frame 21 corresponding to the sliding sleeve 212, and the extended end of the second telescopic plate 214 is fixedly connected to the sliding sleeve 212. A slide rail 213 is fixed to the position of the two groups of vertical plates 211 at the bottom of the placement box 1, and the bottom of the vertical plate 211 slides along the slide rail 213. When the right-angle frame 21 adjusts its width, the second telescopic plate 214 extends or shortens. , keep the connection between the sliding sleeve 212 and the vertical plate 211. When the length of the right-angle frame 21 is adjusted, the connection between the sliding sleeve 212 and the vertical plate 211 drives the limit frame 12 to move along the inside of the paper outlet 11, and the bottom of the vertical plate 211 slides along the slide rail 213, so as to always keep the spacing of the limit frame 12 the same as the length of the delivery outlet of the placement frame 2, and limit and guide the delivered paper. When the placement frame 2 is pulled downward along the telescopic column 31, the sliding sleeve 212 slides downward along the vertical plate 211, and the connection between the placement frame 2 and the limit frame 12 can still be maintained.

[0034] In this embodiment, the connecting assembly 3 also includes a connecting rod 32, and the connecting rod 32 is fixed at the four corners of the bottom plate 13, and the top of the connecting rod 32 is fixedly connected to the extended end of the telescopic column 31, and the top inner wall of the top of the placement box 1 corresponds to the position of the telescopic columns 31 on both sides. A sliding frame 35 is slidably installed, and a slider 33 is symmetrically slidably connected inside the sliding frame 35. The top of the telescopic column 31 is fixedly connected to the slider 33, and two groups of third telescopic plates 34 are provided between the two groups of the sliding frames 35, and the two ends of the third telescopic plates 34 are fixedly connected to the two sliders 33. The two telescopic columns 31 on the same side can slide along the sliding frame 35 through the top slider 33, so as to adjust the width of the placement box 2. During the adjustment process, the first extension of the placement box 2 The retractable plate 26 cooperates with the extension and retraction, and the right-angle frame 21 and the plug plate 22 are slidably connected to maintain the connectivity of the four groups of right-angle frames 21. When the position of the right-angle frame 21 is adjusted along the support plate 23, the slider 33, the slide frame 35 and the telescopic column 31 move synchronously through the connection of the third telescopic plate 34, maintaining the connection with the right-angle frame 21 while adjusting the length of the placement frame 2 (the sliding connection between the slide frame 35 and the top inner wall of the placement box 1 is a common sliding structure of a slide groove, not shown in the figure). Therefore, the telescopic column 31 can always maintain the connection with the placement frame 2, and through the connection of the connecting rod 32, when the bottom plate 13 is opened, the placement frame 2 can be pulled downward to move it out of the placement box 1, so as to facilitate the stacking of paper and the adjustment of the length and width of the placement frame 2.

[0035] When using the device, the paper outlet 11 of the placement box 1 is aligned with the printing station of the printer, the bottom plate 13 is pulled out by the handle 14, and the back cover 16 is opened, and the paper is stacked inside the placement frame 2, and the slide seat 24 slides along the support plate 23 to adjust the position of the right-angle frame 21, thereby adjusting the length of the placement frame 2, and the width of the placement frame 2 is adjusted by the first telescopic plate 26 to meet the storage of papers of different sizes. After the size is determined, it is locked by the bolt 25 to keep the size of the placement frame 2 unchanged, and the two telescopic columns 31 on the same side can slide along the sliding frame 35 through the top slider 33 to adjust the width of the placement frame 2. During this adjustment process, the width of the placement frame 2 The first telescopic plate 26 cooperates with the telescopic extension, and the right-angle frame 21 and the plug plate 22 are slidably plugged to maintain the connectivity of the four groups of right-angle frames 21. When the position of the right-angle frame 21 is adjusted along the support plate 23, the slider 33, the sliding frame 35 and the telescopic column 31 are moved synchronously through the connection of the third telescopic plate 34, and the connection with the right-angle frame 21 is maintained while adjusting the length of the placement frame 2. Therefore, while the telescopic column 31 is always connected to the placement frame 2, the placement frame 2 can be pulled downward and moved out of the placement box 1 through the connection of the connecting rod 32 when the bottom plate 13 is opened, so as to facilitate the stacking of paper and the adjustment of the length and width of the placement frame 2. When the width of the right-angle frame 21 is adjusted, the second telescopic plate 214 is extended Or shorten it, keep the connection between the sliding sleeve 212 and the vertical plate 211, when the right-angle frame 21 is adjusted in length, through the connection between the sliding sleeve 212 and the vertical plate 211, drive the limit frame 12 to move along the inside of the paper outlet 11, and the bottom of the vertical plate 211 slides along the slide rail 213, so as to always keep the spacing of the limit frame 12 the same as the length of the delivery outlet of the placement frame 2, limit and guide the delivered paper, when the placement frame 2 is pulled downward with the telescopic column 31, the sliding sleeve 212 slides downward along the vertical plate 211, and can still keep the connection between the placement frame 2 and the limit frame 12, then push the placement frame 2 back into the placement box 1, and the upper friction wheel 43 drives the uppermost paper from the placement frame 2 outlet The paper is fed out from the end. During this process, the lower friction wheel 42 opens and contacts with the lower surface of the paper. When the fed paper overlaps, the upper paper is rubbed by the upper friction wheel 43 and moves toward the paper outlet 11. The lower paper is retracted into the placement frame 2 by the friction force of the lower end. As the paper is fed, the telescopic rod 27 and the spring 28 at the lower end squeeze the paper to move upward, and the position of the outlet of the placement frame 2 is used to keep the pre-fed paper. The structure of the connecting frame 41 can avoid movement interference when the placement frame 2 moves up and down. When the paper passes through the two sets of limit frames 12 and is fed out, the paper is fed into the printing station of the printer through the paper feeding wheel 15 and fed into the printer for printing.

[0036] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A paper feeding device for a digital printer, comprising a placement box (1), characterized in that: A paper outlet (11) is provided on the top outer wall of one side of the placement box (1), and two groups of limit frames (12) are symmetrically slidably installed inside the paper outlet (11). A placement frame (2) is provided inside the placement box (1), and the placement frame (2) includes four groups of right-angle frames (21), and the four groups of right-angle frames (21) are symmetrically surrounded to form a square. Two groups of support plates (23) are symmetrically provided at the bottom of the right-angle frame (21). A connecting component (3) is provided on the outside of the placement frame (2), and the connecting component (3) includes a telescopic column (31), and the telescopic column (31) has four groups of support plates respectively set at the placement The placing box (2) is provided with a bottom plate (13) at the bottom of the placing box (1), a handle (14) is fixedly provided at the bottom of the bottom plate (13), and the bottom of the bottom plate (13) is connected to the placing box (2). A rear cover (16) is rotatably installed at the bottom of the back of the placing box (1) through a hinge.

2. A paper feeding device for a digital printer according to claim 1, characterized in that: The placement frame (2) further comprises a slide seat (24), the slide seat (24) being fixed at the bottom of the right-angle frame (21), and the slide seat (24) being slidably sleeved on the top of the corresponding support plate (23), first telescopic plates (26) being fixed at both ends of the two groups of support plates (23), and plug plates (22) being slidably plugged into two right-angle sides of adjacent right-angle frames (21).

3. A paper feeding device for a digital printer according to claim 2, characterized in that: Bolts (25) are engaged and inserted at the outer side of the slide seat (24) and the receiving end of the first telescopic plate (26), and the bolts (25) are respectively in compression contact with the support plate (23) and the extended end of the first telescopic plate (26).

4. A paper feeding device for a digital printer according to claim 3, characterized in that: A telescopic rod (27) is fixed at the center of the top of the bottom plate (13), and a push plate (29) is fixed to the extended end of the telescopic rod (27). A spring (28) is sleeved on the periphery of the telescopic rod (27), and both ends of the spring (28) are fixedly connected to the push plate (29) and the bottom plate (13).

5. A paper feeding device for a digital printer according to claim 4, characterized in that: A vertical plate (211) is fixed to one end of the limit frame (12) close to the placement frame (2), and a sliding sleeve (212) is slidably sleeved on the surface of the vertical plate (211); a second telescopic plate (214) is fixed to the outer wall of the right-angle frame (21) at a position corresponding to the sliding sleeve (212), and the extended end of the second telescopic plate (214) is fixedly connected to the sliding sleeve (212); a sliding rail (213) is fixed to the bottom of the placement box (1) at the position corresponding to the two groups of vertical plates (211), and the bottom of the vertical plate (211) slides along the sliding rail (213).

6. A paper feeding device for a digital printer according to claim 1, characterized in that: The connecting assembly (3) further comprises connecting rods (32), the connecting rods (32) being fixed at the four corners of the bottom plate (13), and the top of the connecting rods (32) being fixedly connected to the extended ends of the telescopic columns (31), a sliding frame (35) being slidably mounted on the inner wall of the top of the placement box (1) corresponding to the positions of the telescopic columns (31) on both sides, and a slider (33) being symmetrically slidably connected inside the sliding frame (35), the top of the telescopic column (31) being fixedly connected to the slider (33), two groups of third telescopic plates (34) being arranged between the two groups of the sliding frames (35), and the two ends of the third telescopic plates (34) being fixedly connected to the two sliders (33).

7. A paper feeding device for a digital printer according to claim 6, characterized in that: The tops of the two right-angle frames (21) on the side of the placement frame (2) facing the paper outlet (11) are provided with outlets, and a pressing plate (210) is fixed on the tops of the right-angle frames (21), and there is a certain gap between the pressing plate (210) and the outlets of the right-angle frames (21).

8. A paper feeding device for a digital printer according to claim 7, characterized in that: The ejection assembly (4) further comprises a connecting frame (41), the connecting frame (41) being fixed to a side of the limiting frame (12) facing the upper friction wheel (43), and the upper friction wheel (43) being mounted at the bottom of the other end of the connecting frame (41), and a lower friction wheel (42) being mounted at a middle position of the paper outlet (11) corresponding to the top outlet end of the placement frame (2), and the lower friction wheel (42) corresponds to the gap between the pressing plate (210) and the right-angle frame (21).

9. A paper feeding device for a digital printer according to claim 8, characterized in that: Paper conveying wheels (15) are installed on the upper and lower sides of the other end of the limiting frame (12); the paper conveying wheel (15), the lower friction wheel (42) and the upper friction wheel (43) are all driven by a motor.

10. A paper feeding device for a digital printer according to claim 8, characterized in that: The connecting frame (41) is in a T-shaped structure, and the connecting frame (41) bypasses the top of the third telescopic plate (34).

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