CN213864514U

CN213864514U - Paper feeding mechanism of single-sheet printer

Info

Publication number: CN213864514U
Application number: CN202022993488.6U
Authority: CN
Inventors: 周永生
Original assignee: Shantou High And New Technology Industrial Development Zone Ju Sheng Science And Technology Ltd S
Current assignee: Shantou High And New Technology Industrial Development Zone Ju Sheng Science And Technology Ltd S
Priority date: 2020-12-14
Filing date: 2020-12-14
Publication date: 2021-08-03
Anticipated expiration: 2030-12-14

Abstract

A paper feeding mechanism of a single-sheet printer comprises a base, a paper conveying belt, a paper separating support and a paper separating press roller; the paper conveying belt comprises an annular belt and a conveying motor capable of driving the annular belt to run, the annular belt is provided with a front moving section moving from front to back and a return section below the front moving section, the annular belt is made of a high-elasticity material, and the outer side surface of the annular belt is provided with a plurality of grooves; the paper separating support is arranged above the front section of the annular belt, and a positioning groove is arranged on the bottom surface of the paper separating support; the paper separating press roller is rotatably arranged on the machine base and is positioned in the positioning groove, and the paper separating press roller is arranged along the left-right direction and has a gap with the front section of the annular belt. The paper feeding mechanism can not only complete the paper separating process while conveying the paper to be printed, has high paper separating accuracy, can ensure that only one paper is fed into the printing mechanism, but also can adapt to the paper separating process of the paper with different thicknesses under the condition of no need of stopping and adjusting operation, and can improve the working efficiency and ensure the printing effect.

Description

Paper feeding mechanism of single-sheet printer

Technical Field

The utility model relates to a printer technical field, concretely relates to sheet feeding mechanism of sola printer.

Background

The single-sheet printer, also called single-sheet bar code printer, is a professional printing device which takes various labels, hang tags, washing cloth and the like as paper and can rapidly print a large number of bar codes, characters, symbols and pictures.

In the existing single-sheet printer, paper to be printed is firstly conveyed into a printing mechanism one by a paper feeding mechanism, and then the paper is printed on the paper by the printing mechanism and then sent out; the paper feeding mechanism is generally a conveying belt, a baffle is arranged above the conveying belt, an operator adjusts the height position of the baffle in advance, and the size of a gap between the baffle and the conveying belt is adjusted, so that when paper is conveyed by the conveying belt, only one piece of paper passes through the gap between the baffle and the conveying belt at a time, however, the adjusting operation of the baffle is difficult to control, the height position of the baffle needs to be adjusted when the paper to be printed with different thicknesses is replaced each time, and for general office clerks, the paper feeding mechanism is very troublesome and low in efficiency, and the paper separating accuracy of the baffle is not high, the condition that multiple pieces of overlapped paper are printed easily occurs in the paper feeding process, so that the paper is wasted, and the final printing effect is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a sheet feeding mechanism of sola printer is provided, this kind of sheet feeding mechanism not only can accomplish the branch paper process when treating to print the paper and carry out the transport, can ensure to send into the paper of printing mechanism only one, can adapt to the branch paper process of different thickness papers under the condition that need not the stop and adjust the operation moreover, can improve work efficiency and guarantee to print the effect. The technical scheme is as follows:

the utility model provides a sheet feeding mechanism of single-sheet printer, includes frame and paper conveyer belt, and paper conveyer belt installs on the frame its characterized in that: the paper feeding mechanism also comprises a paper separating support and a paper separating press roller; the paper conveying belt comprises an annular belt and a conveying motor capable of driving the annular belt to run, the annular belt is made of a high-elasticity material, a plurality of grooves which are sequentially arranged along the running direction of the annular belt are formed in the outer side surface of the annular belt, and the annular belt is provided with a front moving section moving from front to back and a return section below the front moving section; the paper separating support is arranged right above the front section of the annular belt; the paper separating press roller is rotatably arranged on the machine base and positioned at the lower side of the paper separating support, and the paper separating press roller is arranged along the left-right direction and forms a gap with the front section of the annular belt.

The high-elasticity material for manufacturing the annular belt can be selected from high-elasticity rubber and silica gel, and also can be selected from elastic plastics such as PE and the like.

In general, the size of the gap formed between the separation roller and the forward section of the endless belt is set according to the minimum thickness value of the paper to be printed.

When the printing machine works, the conveying motor drives the annular belt to run, and the front section of the annular belt drives the paper to be printed in a stacked state to move from front to back; when the paper to be printed reaches the front side of the paper separating support, the paper with the position lower than the bottom surface of the paper separating support passes through a paper conveying channel formed between the paper separating support and the advancing section of the annular belt, and the paper with the position higher than the bottom surface of the paper separating support stops moving under the blocking of the front side surface of the paper separating support, so that the first separation of the paper is realized; when the paper entering the paper conveying channel reaches the front side of the paper separating press roller, the paper is gradually reduced under the blocking of the roller surface of the paper separating press roller (the rest of the paper except the bottommost paper stops moving under the blocking of the paper separating press roller), the bottommost paper enters the gap between the paper separating press roller and the front section of the annular belt and is clamped and conveyed by the paper separating press roller and the front section of the annular belt to move backwards together (at the moment, the paper separating press roller rotates relatively in a passive mode), so that the bottommost paper and the rest of the paper can be smoothly separated, the secondary separation of the paper is realized, only one paper fed into the printing mechanism is ensured, and the problem of printing of multiple overlapped papers cannot occur. Because the annular belt is made of high-elasticity materials, and the outer side surface of the annular belt is provided with a plurality of grooves which are sequentially arranged along the running direction of the annular belt, the friction force between the advancing section of the annular belt and the paper at the lowest side can be effectively increased, the paper at the lowest side can be more smoothly separated from the rest of the paper, and after the paper to be printed with different thicknesses is replaced, when the paper at the lowest side enters the gap between the paper-separating compression roller and the advancing section of the annular belt, the corresponding part on the advancing section of the annular belt can be elastically deformed therewith, the paper-separating process of the paper with different thicknesses can be adapted under the condition of no need of stopping to adjust the operation, the operation is more convenient, the working efficiency can be improved, and the printing effect can be ensured.

In the preferred scheme, the paper feeding mechanism further comprises a press roller driving motor, the press roller driving motor is installed on the base, and a power output shaft of the press roller driving motor is in transmission connection with the paper separating press roller. When the conveying motor drives the annular belt to run, the compression roller driving motor drives the paper separation compression roller to continuously rotate, the linear velocity direction of the lowest point of the roller surface of the paper separation compression roller is opposite to the linear velocity direction of the front section of the annular belt, and when the paper in the stacking state reaches the lower part of the paper separation compression roller under the driving of the front section of the annular belt, the paper separation compression roller presses and conveys other paper except the paper at the lowest side to reversely move the paper, so that the paper at the lowest side can be smoothly separated from other paper, and only one paper fed into the printing mechanism is ensured.

In a specific scheme, a positioning groove is formed in the bottom surface of the paper separating support, the upper portion of the paper separating pressing roller is located in the positioning groove, and the lower portion of the paper separating pressing roller is exposed out of the middle area of the bottom of the paper separating support.

In a preferable scheme, the front end of the bottom surface of the paper separating support is provided with a paper separating inclined surface which is gradually inclined downwards from front to back. The paper entering the paper conveying channel is firstly blocked by the paper separating inclined plane, so that the quantity of the paper reaching the paper separating pressing roller is gradually reduced, the pressure applied to the paper separating pressing roller is relieved, and the paper separating of the paper separating pressing roller is smoother.

In a preferable scheme, the back side of the bottom of the paper separating support is provided with a paper pressing block, and the bottom surface of the paper pressing block is flush with the bottom surface of the paper separating support. When the paper passes over the paper separating support, the paper pressing block is used for pressing the paper to prevent the paper from warping upwards, and the paper conveying belt is ensured to convey the paper into the printing mechanism smoothly.

In a preferred scheme, the paper conveying belt further comprises a front rotating shaft, a rear rotating shaft, a front belt wheel and a rear belt wheel, wherein the front rotating shaft and the rear rotating shaft can be rotatably arranged on the base; the paper separating press roller is positioned right above the rear belt wheel. When the electric belt conveyor works, the conveying motor drives the front rotating shaft or the rear rotating shaft to rotate, and the electric belt conveyor moves from front to back through the front belt wheel or the rear belt wheel; because the rear belt wheel can support the rear end of the front section of the endless belt, and the paper separation compression roller is positioned right above the rear belt wheel, the front section of the endless belt and the paper separation compression roller are matched with each other more stably, and only one piece of paper fed into the printing mechanism can be ensured.

In another preferred scheme, the paper conveying belt further comprises a driving roller and a driven roller, wherein the driving roller and the driven roller are both rotatably mounted on the base, the driving roller is in transmission connection with a power output shaft of the conveying motor, and the driving roller and the driven roller are arranged in parallel front and back and tension the annular belt together; the paper separating compression roller is positioned right above the driven roller. When the device works, the conveying motor drives the driving roller to rotate to drive the forward section of the annular belt to move from front to back; because the driven roller can play the supporting role to the circular band forward section rear end, and the branch paper compression roller is in directly over the driven roller, can make the circular band forward section more stable with the cooperation between the branch paper compression roller like this, can ensure to send into printing mechanism's paper only one.

In the preferred scheme, the paper feeding mechanism further comprises two limiting vertical plates which are arranged side by side from left to right, and the paper separating support and the annular belt are arranged between the two limiting vertical plates. The two limiting vertical plates can limit the position of the paper on the forward section of the annular belt in the left-right direction, so that the paper is prevented from being shifted in the conveying process; and two spacing risers and the preceding middle part of the preceding section of annular band constitute the paper storage tank, and operating personnel can place the paper of waiting to print in the paper storage tank.

In a more preferable scheme, the front side edge of one limiting vertical plate is positioned behind the front side edge of the other limiting vertical plate. Like this, can form the paper feeding mouth in paper storage groove in spacing riser front side, during the paper storage groove was put into to operating personnel accessible paper feeding mouth will treat the paper of printing, convenient operation.

In a more preferred scheme, the paper feeding mechanism further comprises two supporting wheel sets, the two supporting wheel sets are arranged on the left side and the right side of the annular belt side by side, each supporting wheel set comprises a plurality of supporting wheels which are sequentially arranged from front to back, and each supporting wheel can be rotatably installed on one side face, close to the annular belt, of the corresponding limiting vertical plate. Typically, the highest point of the tread of each support wheel is flush with or slightly below the upper surface of the leading section of the elastomeric belt. Two support wheelsets are used for playing the supporting role to the both sides border of paper on the endless belt, prevent that the paper from dropping from one side of endless belt for the paper conveyer belt is more steady to the transport of paper.

In a more preferable scheme, the paper separating support and the two limiting vertical plates are both arranged on the base through a left-right adjusting mechanism; the left-right adjusting mechanism comprises at least one adjusting screw and at least one guide rod, the guide rod is arranged on the base and moves left and right, and the adjusting screw is rotatably arranged on the base and is parallel to the guide rod; the paper separating support is provided with at least one first guide hole and at least one first adjusting screw hole, the paper separating support is provided with at least one second guide hole and at least one second adjusting screw hole, the second guide hole is formed in the limiting vertical plate, the first guide holes of the limiting vertical plate are identical to the guide rods in number and are in one-to-one correspondence, the guide rods sequentially penetrate through the first guide holes of one limiting vertical plate, the second guide holes of the paper separating support and the first guide holes of the other limiting vertical plate, the second adjusting screw holes are formed in the limiting vertical plate, the first adjusting screw holes of the limiting vertical plate are identical to the adjusting screw rods in number and are in one-to-one correspondence, and the adjusting screw rods sequentially penetrate through the first adjusting screw holes of one limiting vertical plate, the second adjusting screw holes of the paper separating support and the first adjusting screw holes of the other limiting vertical plate. In a further preferred scheme, one end of the adjusting screw is fixedly provided with an adjusting wheel. By adopting the structure, the positions of the paper splitting support and the two limiting vertical plates in the left and right directions can be adjusted through the left and right adjusting mechanisms so as to adjust the positions of the paper to be printed in the left and right directions and enable the paper to be printed to correspond to the position of the printing head of the printing mechanism; during adjustment, the adjusting screw rod rotates forwards or reversely by rotating the adjusting wheel, the paper separating support and the two limiting vertical plates are driven to move leftwards or rightwards for a certain distance along the guide rod, and the position of the paper to be printed in the left and right directions is adjusted.

The utility model discloses a paper feeding mechanism passes through the cooperation between paper conveyer belt, branch paper support and the branch paper compression roller, not only can accomplish the branch paper process when treating that the printing paper carries out the transport, and the branch paper degree of accuracy is high, can ensure that the paper of sending into printing mechanism only has one, can not appear many problems that overlap the paper and print. Because the annular belt is made of high-elasticity materials, and the outer side surface of the annular belt is provided with a plurality of grooves which are sequentially arranged along the running direction of the annular belt, the friction force between the advancing section of the annular belt and the paper at the lowest side can be effectively increased, the paper at the lowest side can be more smoothly separated from the rest of the paper, and after the paper to be printed with different thicknesses is replaced, when the paper enters the gap between the paper-separating compression roller and the advancing section of the annular belt, the corresponding part on the advancing section of the annular belt can be elastically deformed therewith, the paper-separating process of the paper with different thicknesses can be adapted under the condition of no need of stopping to adjust the operation, the operation is more convenient, the working efficiency can be improved, and the printing effect can be ensured.

Drawings

Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.

Fig. 2 is a sectional view a-a of fig. 1.

Fig. 3 is a top view of fig. 1.

Detailed Description

As shown in fig. 1 to 3, the sheet feeding mechanism of such a sheet-fed printer includes a base (not shown), a sheet conveying belt 2, a sheet separating support 3, a sheet separating roller 4, and a roller driving motor 5; the paper conveying belt 2 is installed on the base, the paper conveying belt 2 comprises an annular belt 21 and a conveying motor 22 capable of driving the annular belt 21 to run, the annular belt 21 is provided with a front running section 211 moving from front to back and a return section 212 positioned below the front running section, the annular belt 21 is made of a high-elasticity material, and the outer side surface of the annular belt 21 is provided with a plurality of grooves 2101 sequentially arranged along the running direction of the annular belt 21; the paper separating support 3 is arranged right above the annular belt advancing section 211; the paper separating press roller 4 is rotatably arranged on the machine base and is positioned at the lower side of the paper separating support 3, and the paper separating press roller 4 is arranged along the left-right direction and forms a gap with the annular belt advancing section 211; the compression roller driving motor 5 is installed on the base, and a power output shaft of the compression roller driving motor 5 is in transmission connection with the paper dividing compression roller 4.

In the present embodiment, the highly elastic material used for the endless belt 21 is highly elastic rubber.

In the present embodiment, the bottom surface of the paper separation support 3 is provided with a positioning groove 31, the upper portion of the paper separation pressing roller 4 is located in the positioning groove 31, and the lower portion of the paper separation pressing roller 4 is exposed outside the middle area of the bottom of the paper separation support 3.

In the present embodiment, the front end of the bottom surface of the paper separation holder 3 is provided with a paper separation slope 32 that gradually slopes downward from front to back.

In the present embodiment, the paper separation holder 3 is provided with a paper pressing block 33 at the bottom rear side, and the bottom surface of the paper pressing block 33 is flush with the bottom surface of the paper separation holder 3. The paper pressing block 33 is used to press the paper to prevent the paper from warping when the paper passes over the paper separating support 3, ensuring that the paper can be smoothly fed into the printing mechanism by the paper conveying belt 2.

In this embodiment, the sheet conveying belt 2 further includes a front rotating shaft 23, a rear rotating shaft 24, a front pulley 25 and a rear pulley 26, the front rotating shaft 23 and the rear rotating shaft 24 are both rotatably mounted on the base, the rear rotating shaft 24 is in transmission connection with the power output shaft of the conveying motor 22, the front pulley 25 is mounted on the front rotating shaft 23, the rear pulley 26 is mounted on the rear rotating shaft 24, and the front pulley 25 and the rear pulley 26 are arranged side by side in the front-rear direction and tension the endless belt 21 together; the separation roller 4 is positioned right above the rear pulley 26.

The paper feeding mechanism further comprises two limiting vertical plates 6 which are arranged side by side in the left and right direction, the paper separating support 3, the front belt wheel 25, the rear belt wheel 26 and the annular belt 21 are arranged between the two limiting vertical plates 6, and through holes 601 through which the paper separating compression rollers 4 can pass are formed in the two limiting vertical plates 6. The two limiting vertical plates 6 are used for limiting the position of the paper on the front section 211 of the annular belt in the left-right direction, so that the paper is prevented from deviating in the conveying process; and two spacing risers 6 and the preceding middle part of the preceding section 211 of endless belt constitute the paper storage tank, and operating personnel can place the paper of waiting to print in the paper storage tank.

In this embodiment, the front edge of one vertical stopper 6 is located behind the front edge of the other vertical stopper 6. Therefore, a paper adding opening of the paper storage groove can be formed in the front side of the limiting vertical plate 6, and an operator can place paper to be printed into the paper storage groove through the paper adding opening, so that the operation is convenient.

In this embodiment, the paper feeding mechanism further includes two supporting wheel sets 7, the two supporting wheel sets 7 are disposed side by side on the left and right sides of the endless belt 21, the supporting wheel set 7 includes a plurality of supporting wheels 71 sequentially arranged from front to back, and each supporting wheel 71 is rotatably mounted on a side surface of the corresponding vertical limiting plate 6 close to the endless belt 21. Two support wheelsets 7 are used for playing the supporting role to the both sides border of paper on the endless belt 21, prevent that the paper from dropping from one side of endless belt 21 for the transport of paper conveyer belt 2 to the paper is more steady.

In the embodiment, the paper separating support 3 and the two limiting vertical plates 6 are both arranged on the machine base through the left-right adjusting mechanism 8; the left-right adjusting mechanism 8 comprises a plurality of adjusting screws 81 and a plurality of guide rods 82, the guide rods 82 are arranged on the base and move left and right, the adjusting screws 81 are rotatably arranged on the base and are parallel to the guide rods 82, and one end of each adjusting screw 81 is fixedly provided with an adjusting wheel 811; the limiting vertical plate 6 is provided with a plurality of first guide holes 601 and a plurality of first adjusting screw holes 602, the paper separating support 3 is provided with a plurality of second guide holes 301 and a plurality of second adjusting screw holes 302, the second guide holes 301 and the first guide holes 601 of the limiting vertical plate 6 are in the same number with the guide rods and are in one-to-one correspondence, the guide rods 82 sequentially penetrate through the first guide holes 601 of one limiting vertical plate 6, the second guide holes 301 of the paper separating support 3 and the first guide holes 601 of the other limiting vertical plate 6, the second adjusting screw holes 302 and the first adjusting screw holes 602 of the limiting vertical plate 6 are in the same number with the adjusting screws 81 and are in one-to-one correspondence, and the adjusting screws 81 sequentially penetrate through the first adjusting screw holes 602 of one limiting vertical plate 6, the second adjusting screw holes 302 of the paper separating support 3 and the first adjusting screw holes 602 of the other limiting vertical plate 6. The positions of the paper splitting support 3 and the two limiting vertical plates 6 in the left and right direction can be adjusted through the left and right adjusting mechanism 8 so as to adjust the positions of the paper to be printed in the left and right direction and enable the paper to correspond to the position of a printing head of the printing mechanism; during adjustment, the adjusting screw 81 can rotate forward or reversely by rotating the adjusting wheel 811, so as to drive the paper separating support 3, the two limiting vertical plates 6 and the two supporting wheel sets 7 to move leftward or rightward along the guide rods 82 for a certain distance, so as to adjust the position of the paper to be printed in the left-right direction.

The following briefly describes the working principle of the paper feeding mechanism of the single-sheet printer:

in operation, the conveying motor 22 drives the rear rotating shaft 24 and the rear belt wheel 26 to rotate, so as to drive the front section 211 of the endless belt to move from front to back, and simultaneously, the press roller driving motor 5 drives the paper separation press roller 4 to rotate continuously (the linear speed direction of the lowest point of the roller surface of the paper separation press roller 4 is opposite to the linear speed direction of the front section 211 of the endless belt). When the paper to be printed reaches the front side of the paper separating support 3, the paper positioned above the bottom surface of the paper separating support 3 stops moving under the blocking of the front side surface of the paper separating support 3, and the paper positioned below the bottom surface of the paper separating support 3 passes through a paper conveying channel 34 formed between the paper separating support 3 and the annular belt advancing section 211, so that the paper is separated for the first time; then the paper entering the paper conveying channel 34 is blocked by the paper separating inclined plane 32, so that the number of the paper reaching the paper separating press roller 4 is gradually reduced, when the paper reaches the front side of the paper separating press roller 4 under the driving of the annular belt advancing section 211, the paper is gradually reduced under the blocking of the roller surface of the paper separating press roller 4, the lowest paper enters the gap between the paper separating press roller 4 and the annular belt advancing section 211 under the driving of the annular belt advancing section 211, and meanwhile, the paper separating press roller 4 presses and conveys the other paper except the lowest paper in a reverse direction to be smoothly separated from the lowest paper, so that the second separation of the paper is realized, and only one paper fed into the printing mechanism is ensured.

In addition, it should be noted that the names of the parts and the like of the embodiments described in the present specification may be different, and all the equivalent or simple changes made according to the structure, the features and the principle of the present invention are included in the protection scope of the present invention. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a sheet feeding mechanism of single-sheet printer, includes frame and paper conveyer belt, and paper conveyer belt installs on the frame its characterized in that: the paper feeding mechanism also comprises a paper separating support and a paper separating press roller; the paper conveying belt comprises an annular belt and a conveying motor capable of driving the annular belt to run, the annular belt is made of a high-elasticity material, a plurality of grooves which are sequentially arranged along the running direction of the annular belt are formed in the outer side surface of the annular belt, and the annular belt is provided with a front moving section moving from front to back and a return section below the front moving section; the paper separating support is arranged right above the front section of the annular belt; the paper separating press roller is rotatably arranged on the machine base and positioned at the lower side of the paper separating support, and the paper separating press roller is arranged along the left-right direction and forms a gap with the front section of the annular belt.

2. The sheet feeding mechanism for a single sheet printer as claimed in claim 1, wherein: the paper feeding mechanism further comprises a compression roller driving motor, the compression roller driving motor is installed on the base, and a power output shaft of the compression roller driving motor is in transmission connection with the paper separating compression roller.

3. The sheet feeding mechanism for a single sheet printer as claimed in claim 1, wherein: the paper separating device is characterized in that a positioning groove is formed in the bottom surface of the paper separating support, the upper portion of the paper separating pressing roller is located in the positioning groove, and the lower portion of the paper separating pressing roller is exposed out of the middle area of the bottom of the paper separating support.

4. The sheet feeding mechanism for a single sheet printer as claimed in claim 1, wherein: the front end of the bottom surface of the paper separating support is provided with a paper separating inclined plane which gradually inclines downwards from front to back.

5. The sheet feeding mechanism for a single sheet printer as claimed in claim 1, wherein: the back side of the bottom of the paper separating support is provided with a paper pressing block, and the bottom surface of the paper pressing block is flush with the bottom surface of the paper separating support.

6. The sheet feeding mechanism for a sheet-fed printer according to any one of claims 1 to 5, wherein: the paper conveying belt also comprises a front rotating shaft, a rear rotating shaft, a front belt wheel and a rear belt wheel, wherein the front rotating shaft and the rear rotating shaft can be rotatably arranged on the base; the paper separating press roller is positioned right above the rear belt wheel.

7. The sheet feeding mechanism for a sheet-fed printer according to any one of claims 1 to 5, wherein: the paper feeding mechanism further comprises two limiting vertical plates which are arranged side by side in the left and right directions, and the paper separating support and the annular belt are arranged between the two limiting vertical plates.

8. The sheet feeding mechanism for a single sheet printer as claimed in claim 7, wherein: the front side edge of one limiting vertical plate is positioned behind the front side edge of the other limiting vertical plate.

9. The sheet feeding mechanism for a single sheet printer as claimed in claim 7, wherein: the paper feeding mechanism further comprises two supporting wheel sets, the two supporting wheel sets are arranged on the left side and the right side of the annular belt side by side, each supporting wheel set comprises a plurality of supporting wheels which are sequentially arranged from front to back, and each supporting wheel can be rotatably installed on one side face, close to the annular belt, of the corresponding limiting vertical plate.

10. The sheet feeding mechanism for a single sheet printer as claimed in claim 7, wherein: the paper separating support and the two limiting vertical plates are arranged on the base through a left-right adjusting mechanism; the left-right adjusting mechanism comprises at least one adjusting screw and at least one guide rod, the guide rod is arranged on the base and moves left and right, and the adjusting screw is rotatably arranged on the base and is parallel to the guide rod; the paper separating support is provided with at least one first guide hole and at least one first adjusting screw hole, the paper separating support is provided with at least one second guide hole and at least one second adjusting screw hole, the second guide hole is formed in the limiting vertical plate, the first guide holes of the limiting vertical plate are identical to the guide rods in number and are in one-to-one correspondence, the guide rods sequentially penetrate through the first guide holes of one limiting vertical plate, the second guide holes of the paper separating support and the first guide holes of the other limiting vertical plate, the second adjusting screw holes are formed in the limiting vertical plate, the first adjusting screw holes of the limiting vertical plate are identical to the adjusting screw rods in number and are in one-to-one correspondence, and the adjusting screw rods sequentially penetrate through the first adjusting screw holes of one limiting vertical plate, the second adjusting screw holes of the paper separating support and the first adjusting screw holes of the other limiting vertical plate.