CN111874698A

CN111874698A - Paper receiving device of printing machine and rotary printing machine

Info

Publication number: CN111874698A
Application number: CN202010687763.3A
Authority: CN
Inventors: 吴宁周; 郭杰; 杨庆生; 罗存虎
Original assignee: Shaanxi Siwei Printing Co ltd
Current assignee: Shaanxi Siwei Printing Co ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2020-11-03
Anticipated expiration: 2040-07-16
Also published as: CN111874698B

Abstract

The application relates to a printing machine connects paper device and rotary press relates to lithography apparatus's field, aims at solving and how to guarantee the fastness of connecting between two papers when guaranteeing that the paper does not take place to damage. The utility model provides a printing machine connects paper device, includes the mounting bracket, locate the former paper frame on the mounting bracket, rotate the paper receiving roller who connects the tensioning roller on the mounting bracket and locate tensioning roller one side, be provided with two at least scroll installation positions on the former paper frame, and the axis of every scroll installation position is all parallel with the tensioning roller with the paper receiving roller, the paper receiving roller both ends are provided with the movable block respectively, the paper receiving roller rotates to be connected on the movable block, be provided with the actuating mechanism that the drive movable block is close to the tensioning roller on the mounting bracket. A rotary press comprises the paper receiving device of the press. The paper connecting device has the effect of ensuring the firmness of connection between two pieces of paper while ensuring that the paper is not damaged in the process of connecting the paper.

Description

Paper receiving device of printing machine and rotary printing machine

Technical Field

The application relates to the field of printing equipment, in particular to a paper receiving device of a printing machine and a rotary printing machine.

Background

When the rotary printing machine works, the old paper roll at the paper feeding end needs to be stopped by a worker to connect a new paper roll to the old paper roll after the paper roll is unreeled, and then the rotary printing machine can be started to unreel the paper roll continuously, so that the unreeling work is stopped, the production efficiency is reduced, and the printing quality is also influenced.

In order to realize non-stop reel change, when the paper of the used paper roll is about to be used up, glue is coated on the end part of the paper on the new paper roll, a clamp is used for clamping the paper, and the paper is quickly pressed on the paper on the old paper roll, so that the connection between the new paper and the old paper is realized.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: in the moment that two papers are close to mutual adhesion, if the time of pressfitting is short, can cause the paper to connect insecurely, if the pressfitting time overlength, then can cause the hindrance to the conveying of old paper, lead to the paper phenomenon of tearing to appear.

Disclosure of Invention

In order to guarantee the fastness of connecting between two papers when guaranteeing that the paper does not take place to damage, this application provides a printing machine connects paper device and rotary printing machine.

In a first aspect, the application provides a printing machine paper receiving device, which adopts the following technical scheme:

the utility model provides a printing machine connects paper device, includes the mounting bracket, locates former paper frame on the mounting bracket, rotate connect in tensioning roller on the mounting bracket with locate the paper receiving roller of tensioning roller one side, be provided with two at least scroll installation positions on the former paper frame, and the axis of every scroll installation position is all parallel with tensioning roller and paper receiving roller, paper receiving roller both ends are provided with the movable block respectively, paper receiving roller rotate connect in on the movable block, be provided with the drive on the mounting bracket the movable block is close to the actuating mechanism of tensioning roller.

By adopting the technical scheme, the paper roll mounting position on the body paper frame is used for mounting the paper roll, the tensioning roller is used for tensioning paper, the paper on the paper roll mounted on the body paper frame enters the interior of the printing machine through the tensioning roller, when the paper on the old paper roll is about to be used up, a new paper roll is mounted on the other paper roll mounting position, the paper head on the paper roll is pulled to the paper receiving roller, glue is coated, then the driving mechanism drives the moving block and the paper receiving roller to be close to the tensioning roller, so that the paper head of the new paper is pressed on the old paper, in the extrusion process, because the tensioning roller and the paper receiving roller can rotate, even if the tensioning roller and the paper receiving roller extrude each other, the paper can still pass through the relative rotation without damaging the paper, therefore, the paper receiving roller does not need to be separated from the tensioning roller rapidly, and in the process of the paper passing between the tensioning roller and the paper receiving roller, the whole surfaces of the new paper and the old paper can be extruded, and the firmness and the flatness of the connection of the two papers are ensured.

Preferably, drive arrangement is the perpendicular to connect the pressure paper cylinder that the axis of paper roll set up, the cylinder body of pressing the paper cylinder rotate connect in on the mounting bracket, press the piston rod fixed connection of paper cylinder in on the movable block, be equipped with slewing mechanism between pressure paper cylinder and the mounting bracket, the center of rotation of pressing the paper cylinder is located on the axis of rotation's of tensioning roller the extension line.

Through adopting above-mentioned technical scheme, because the direct contact face between paper receiving roller and the tensioning roller is less, therefore, when the pressure paper cylinder carries new paper and is close to the old paper on the tensioning roller, the tip of new paper is difficult to be pressed, along with the paper conveys forward, the tip of new paper takes place to curl up easily, influence the planarization and the printing quality of paper, and cause certain damage to the printing position of printing machine, and after slewing mechanism has been set up, after the pressure paper cylinder drives the paper receiving roller and is close to the tensioning roller, slewing mechanism drives the pressure paper cylinder and keeps away from body paper frame one side to the tensioning roller and rotates fast, make the paper receiving roller can extrude the paper head part of new paper, prevent that the front end paper hair of paper junction from taking place to curl up.

Preferably, slewing mechanism include with the coaxial pivot that sets up of tensioning roller, fixed connection in the driven gear at pivot both ends, with driven gear engaged with the driving gear and with the rotation motor of driving gear connection, the casing that rotates the motor is fixed in on the mounting bracket, the output shaft with driving gear coaxial coupling, press the cylinder body fixed connection of paper cylinder in the pivot.

Through adopting above-mentioned technical scheme, the rotation that rotates the motor drives the driving gear and rotates, and the driving gear drives driven gear and rotates, and driven gear drives the pressure paper cylinder of being connected with it and rotates to the drive connects the paper roll to rotate around the dancer roll, realizes compressing tightly the paper head front end.

Preferably, an air cavity is arranged inside the roller of the paper receiving roller, a plurality of air holes are formed between the air cavity and the outer wall of the paper receiving roller, an air pipe is connected to the air cavity, and an air suction pump is connected to the air pipe.

Through adopting above-mentioned technical scheme, the aspiration pump is bled from the air cavity through the trachea, forms the vacuum space in the air cavity to breathe in through the gas pocket, adsorb new paper and hug closely on connecing the paper roll, realize connecing the paper roll to the fixed of paper, but the flatting of paper can be realized again to fixed in-process, make new paper be close to can be comprehensive paint glue on the face of old paper, guarantee the fastness that two papers connect.

Preferably, connect paper roll one side to be equipped with and spout mucilage binding and put, spout the mucilage binding and put include with connect the parallel slide rail of paper roll, slide set up in slider on the slide rail, connect in shower nozzle on the slider, connect in glue water pipe on the shower nozzle, locate glue the water pipe and keep away from the gluey bucket of shower nozzle one end and connect in glue pump of taking out on the pipe.

Through adopting above-mentioned technical scheme, the slider slides on the slide rail, it removes along connecing paper roller length direction to drive the shower nozzle, remove the in-process, the glue pumping pump passes through gluey water pipe and extracts glue from gluing the bucket and spray to the paper on the connecing paper roller, the realization is glued to the automation of paper, adopt mechanical control glue to spray, glue spraying amount and spraying area are controllable and even, can enough prevent because glue that glue spraying amount is inhomogeneous leads to the fact overflow and the adhesion insecure, also can prevent because glue sprays the glue that the scope inaccuracy leads to and exposes and pollute, the surface quality after the paper is connected has been guaranteed.

Preferably, be equipped with on the slider and spout gluey cylinder, the cylinder body and the piston rod that spout gluey cylinder are connected respectively slider and shower nozzle, the piston rod that spouts gluey cylinder is flexible along the direction of being close to or keeping away from paper receiving roll.

Through adopting above-mentioned technical scheme, when spraying glue, spout gluey cylinder and drive and spout head rest and be close to paper roll, closely spray glue, the connection quality of paper is guaranteed to the scope of spraying of better control glue.

Preferably, the base paper frame is rotatably connected to the mounting frame, the rotation axis of the base paper frame is parallel to the tension roller, and the mounting frame is provided with a driving mechanism for rotating the base paper frame.

Through adopting above-mentioned technical scheme, drive former paper frame through roll change mechanism and rotate, after connecting between two rolls of paper, can rotate original scroll position with new scroll, demolish the reel of old scroll, install another new scroll on scroll installation position, in order to be ready for next paper splicing, thereby make the paper splicing in-process each time, the rigidity of new scroll and old scroll, be convenient for go on many times repeatedly of paper splicing process, and the operation mode of paper splicing process each time is the same.

Preferably, the reel changing mechanism comprises a reel changing shaft connected to the base paper frame, a reel changing motor fixed on the mounting frame, a notched disc coaxially connected to an output shaft of the reel changing motor, and a sheave coaxially connected to the reel changing shaft, wherein the sheave comprises a plurality of arc sections matched with the notched disc and notches arranged at intervals with the arc sections; and a rotating pin matched with the notch is arranged at the notch position of the notch disc.

Through adopting above-mentioned technical scheme, the change of lap motor drives the breach disc and rotates, the breach disc is at the pivoted in-process, the intermittent type notch that enters into on the sheave of rotating pin, drive sheave and body paper frame and rotate certain angle, when the rotating pin is about to break away from this notch, change of lap motor stall, the rotating pin realizes spacing to sheave and body paper frame, when changing the lap each time, change of lap mechanism rotates the round, ensure that the rotating pin stops the same position on the notch of difference, the realization is connected at the paper of same position, the operation of being convenient for.

In a second aspect, the present application provides a rotary press, which adopts the following technical solution:

a rotary press comprises the paper receiving device of the press.

Through adopting above-mentioned technical scheme, rotary press can carry out continuous printing work, and printing efficiency is high to the in-process of changing the paper can not cause the damage of paper, and the connection between the different paper is more firm moreover, and connection quality is stable.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the printing machine does not damage the paper in the paper changing process, and simultaneously, the whole surfaces of the new paper and the old paper can be extruded, so that the firmness and the flatness of the connection of the two papers are ensured;

2. the paper receiving roller can be pressed to the paper head part of new paper, so that the paper head at the front end of the paper connecting part is prevented from being warped;

3. the paper can be flatly spread in the process of fixing the paper by the paper receiving roller, so that the surface of the new paper close to the old paper can be completely coated with glue, and the firmness of the connection of the two papers is ensured;

4. glue can be automatically sprayed on the paper, and the glue spraying range and the glue using amount are more accurate;

5. the operation position of the paper connection is fixed, so that the paper connection at the same position is realized, and the operation is convenient.

Drawings

Fig. 1 is a schematic view of the overall structure of a paper receiving device of a printing press according to the present embodiment.

Fig. 2 is a schematic sectional structure view of fig. 1 taken in a direction perpendicular to the tension roller.

Fig. 3 is a schematic structural diagram of a paper receiving device of a printing machine of the embodiment with one side elevation of a mounting frame removed.

Fig. 4 is an enlarged schematic view of a portion a of fig. 3.

Fig. 5 is an enlarged schematic view of a portion B of fig. 3.

Fig. 6 is a schematic structural diagram of the glue spraying device.

Fig. 7 is an enlarged schematic view of a portion C of fig. 2.

Description of reference numerals: 1. a mounting frame; 2. a base paper holder; 3. a roll changing mechanism; 31. changing the reel; 32. a reel changing motor; 33. a notched disc; 34. a rotation pin; 35. a grooved wheel; 351. a circular arc section; 352. a notch; 4. a tension roller; 5. paper receiving rollers; 51. an air cavity; 52. air holes; 53. an air tube; 54. an air pump; 6. a moving block; 7. a paper pressing cylinder; 8. a rotating mechanism; 81. a rotating shaft; 82. rotating the motor; 83. a driving gear; 84. a driven gear; 9. a glue spraying device; 91. a slide rail; 92. a slider; 93. a screw rod; 94. a limiting rod; 95. a slide motor; 96. a glue spraying cylinder; 97. a spray head; 98. a glue pipe; 99. a glue pump; 10. and (6) gluing a bucket.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses a paper receiving device of a printing machine, referring to fig. 1 and fig. 2, the paper receiving device comprises an installation frame 1, a raw paper frame 2 rotationally connected to the installation frame 1, a tension roller 4 rotationally connected to the installation frame 1 and a paper receiving roller 5 arranged on one side of the tension roller 4, wherein at least two paper roll installation positions are arranged on the raw paper frame 2, 4 paper roll installation positions on the raw paper frame 2 are arranged, the central axis of each paper roll installation position is parallel to the tension roller 4 and the paper receiving roller 5, paper connected to the raw paper frame 2 bypasses the tension roller 4 and can enter the printing machine, the paper receiving roller 5 is arranged on one side of the tension roller 4, which is used for feeding paper to pass through, paper in the embodiment is passed through from the lower side of the tension roller 4, the paper receiving roller 5 is arranged below the tension roller 4, moving blocks 6 are respectively arranged at two ends of the paper receiving roller 5, the paper receiving roller 5 is rotatably connected onto the moving blocks 6, and a driving mechanism for driving the moving blocks 6 to be close to the tension roller 4 is arranged on the mounting frame 1.

Referring to fig. 3 and 4, a reel changing mechanism 3 for driving the original paper holder 2 to rotate is arranged on the mounting frame 1, the reel changing mechanism 3 includes a reel changing shaft 31 connected to the original paper holder 2, a reel changing motor 32 fixed on the mounting frame 1, a notched disc 33 coaxially connected to an output shaft of the reel changing motor 32, and a sheave 35 coaxially connected to the reel changing shaft 31, the sheave 35 includes four arc sections 351 matched with the notched disc 33 and notches 352 spaced from the arc sections 351; the cut-out position of the cut-out disc 33 is provided with a rotation pin 34 cooperating with the notch 352. The roll changing motor 32 drives the notched disc 33 to rotate, the notched disc 33 is in the rotating process, the rotating pin 34 intermittently enters the notch 352 on the grooved wheel 35 to drive the grooved wheel 35 and the base paper frame 2 to rotate for a certain angle, when the rotating pin 34 is about to be separated from the notch 352, the roll changing motor 32 stops rotating, the rotating pin 34 realizes the limit of the grooved wheel 35 and the base paper frame 2, when each roll changing, the roll changing mechanism 3 rotates for one circle to ensure that the rotating pin 34 stays at the same position on different notches 352, then the new paper roll rotates to the original paper roll position, the winding drum of the old paper roll is dismantled, another new paper roll is installed on the paper roll installing position for the next paper receiving, the arrangement is such that the old paper roll and the new paper roll are both located at the same position during each roll changing, the passing positions of the paper on the tension roller 4 and the paper receiving roller 5 are fixed, and the paper receiving process is convenient to be repeated for many times, and the operation mode of each paper splicing process is the same, so that the operation is convenient.

Referring to fig. 3 and 5, the driving device is a paper pressing cylinder 7 arranged on the axis perpendicular to the paper receiving roller 5, the cylinder body of the paper pressing cylinder 7 is rotatably connected to the mounting frame 1 along the direction perpendicular to the paper receiving roller 5, the piston rod of the paper pressing cylinder 7 is welded on the moving block 6, a rotating mechanism 8 is arranged between the paper pressing cylinder 7 and the mounting frame 1, and the rotating center of the paper pressing cylinder 7 is located on the extension line of the rotating axis of the tension roller 4. Referring to fig. 1 and 3, the rotating mechanism 8 includes a rotating shaft 81 coaxially disposed with the tension roller 4, a driven gear 84 fixedly connected to both ends of the rotating shaft 81, a driving gear 83 engaged with the driven gear 84, and a rotating motor 82 connected to the driving gear 83, a housing of the rotating motor 82 is screwed on the mounting frame 1, an output shaft is coaxially connected to the driving gear 83, and a cylinder body of the paper pressing cylinder 7 is welded to the rotating shaft 81.

Referring to fig. 2, in order to fix the paper without affecting the connection between the new and old paper by the paper receiving roller 5, an air chamber 51 is arranged inside the roller of the paper receiving roller 5, a plurality of air holes 52 are arranged between the air chamber 51 and the outer wall of the paper receiving roller 5, one end of the air chamber 51 is connected with an air pipe 53, and the air pipe 53 is connected with an air suction pump 54. Air pump 54 draws air from air cavity 51 through trachea 53, forms the vacuum space in the air cavity 51 to breathe in through gas pocket 52, adsorb new paper and hug closely on connecing paper roll 5, realize connecing paper roll 5 to the fixed of paper, but the flattening of paper can be realized again to fixed in-process, make new paper be close to can be comprehensive on the face of old paper paint glue, guarantee the fastness that two papers are connected.

Referring to fig. 2 and 6, a glue spraying device 9 is arranged on one side, away from the base paper frame 2, of the paper receiving roller 5, the glue spraying device 9 comprises a sliding rail 91 parallel to the paper receiving roller 5, a sliding block 92 arranged on the sliding rail 91 in a sliding manner, a spray head 97 connected to the sliding block 92, a glue pipe 98 connected to the spray head 97, a glue barrel 10 connected to one end, away from the spray head 97, of the glue pipe 98, and a glue pumping pump 99 connected to the glue pipe 98, wherein the glue pumping pump 99 pumps glue from the glue barrel 10 to the spray head 97 and sprays the glue onto paper on the paper receiving roller 5.

Referring to fig. 6 and 7, the mechanism for driving the sliding block 92 to slide on the sliding rail 91 includes a screw 93 and a limit rod 94 which are parallel to the sliding rail 91, and a sliding motor 95 with a housing screwed on the mounting frame 1, wherein an output shaft of the sliding motor 95 is coaxially connected with the screw 93.

Referring to fig. 7, a glue spraying cylinder 96 is welded on the slide block 92, a cylinder body of the glue spraying cylinder 96 is welded on the slide block 92, the end of a piston rod is connected with a spray head 97, and the piston rod of the glue spraying cylinder 96 extends and retracts along a direction close to or far away from the paper receiving roller 5.

The glue spraying device 9 is implemented according to the following principle: after the paper is fixed on the paper receiving roller 5, the glue spraying cylinder 96 is started to drive the spray head 97 to eject, the spray head 97 is close to the paper receiving roller 5, then the sliding motor 95 is started, the sliding block 92 is driven by the rotation of the sliding motor 95 to slide on the sliding rail 91, the spray head 97 is driven to move along the length direction of the paper receiving roller 5, in the moving process, the glue pumping pump 99 pumps glue from the glue barrel 10 through the glue pipe 98 and sprays the glue on the paper receiving roller 5, automatic glue spraying on the paper is realized, glue spraying amount and spraying area are controlled and uniform by adopting mechanical control, glue overflowing and paper adhesion insecure caused by uneven glue spraying amount can be prevented, glue exposure and pollution caused by inaccurate glue spraying range can be prevented, and the surface quality of the connected paper is ensured.

The implementation principle of the paper receiving device of the printing machine in the embodiment of the application is as follows: paper on the paper roll arranged on the base paper frame 2 enters the interior of the printing machine through the tension roller 4, when the paper on the old paper roll is about to be used up, a new paper roll is arranged on the other paper roll mounting position, and the paper head on the paper roll is pulled to the paper receiving roller 5; then starting the air pump 54 to adsorb the paper to enable the paper to be tightly attached to the paper receiving roller 5, and then starting the glue spraying device 9 to enable the glue to be uniformly sprayed on the surface of the paper on the paper receiving roller 5; and then, starting the paper pressing cylinder 7 to drive the moving block 6 and the paper receiving roller 5 to be close to the tensioning roller 4 so as to press new paper on old paper, and after the two pieces of paper are pressed together, starting the rotating mechanism 8 to drive the paper pressing cylinder 7 to rapidly rotate towards one side of the tensioning roller 4, which is far away from the original paper frame 2, so that the paper receiving roller 5 can press the paper head part of the new paper, and the front paper head at the paper connection part is prevented from being curled. In the in-process of two papers of meeting paper roller 5 and tensioning roller 4 extrusion, because tensioning roller 4 and meeting paper roller 5 all can rotate, consequently even tensioning roller 4 extrudees each other with meeting paper roller 5, still can guarantee the passing through of paper through relative rotation, can not lead to the fact the damage to the paper, consequently, compare with the correlation technique, meet paper roller 5 and need not quick and tensioning roller 4 separation, at the in-process that the paper passes through between tensioning roller 4 and the meeting paper roller 5, new paper and old paper whole face homoenergetic can obtain the extrusion, the fastness and the roughness of two paper connections have been guaranteed.

Wherein, the rotation principle of the rotating mechanism 8 is as follows: the rotation of the rotating motor 82 drives the driving gear 83 to rotate, the driving gear 83 drives the driven gear 84 to rotate, and the driven gear 84 drives the paper pressing cylinder 7 connected with the driven gear to rotate, so that the paper receiving roller 5 is driven to rotate around the paper pressing roller, and the front end of the paper head is pressed tightly.

The embodiment of the application also discloses a rotary press, including above-mentioned printing machine paper collecting device, this printing machine paper collecting device sets up the paper feed end at rotary press.

The implementation principle of a rotary press of the embodiment of the application is as follows: through setting up printing machine paper receiving device, the paper enters into the inside printing unit of rotary press behind the paper receiving device, and when the paper on a scroll will be used up soon, does not shut down and trades the paper for rotary press can carry out continuous printing work, and printing efficiency is high, and can not cause the damage of paper at the in-process of changing the paper, and the connection between the different paper is more firm moreover, and connection quality is stable.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A kind of printer connects the paper device, characterized by: including mounting bracket (1), locate raw paper frame (2), rotation on mounting bracket (1) connect in tensioning roller (4) on mounting bracket (1) with locate connect paper roll (5) of tensioning roller (4) one side, be provided with two at least scroll installation positions on raw paper frame (2), and the axis of every scroll installation position is all parallel with tensioning roller (4) and connect paper roll (5), it is provided with movable block (6) respectively to connect paper roll (5) both ends, connect paper roll (5) rotate connect in on movable block (6), be provided with the drive on mounting bracket (1) movable block (6) are close to the actuating mechanism of tensioning roller (4).

2. The printing press delivery unit of claim 1, wherein: drive arrangement is the perpendicular to connect the pressure paper cylinder (7) that the axis of paper roll (5) set up, the cylinder body of pressing paper cylinder (7) rotate connect in on mounting bracket (1), press the piston rod fixed connection of paper cylinder (7) in on movable block (6), press and be equipped with slewing mechanism (8) between paper cylinder (7) and mounting bracket (1), the center of rotation of pressing paper cylinder (7) is located on the axis of rotation's of tensioning roller (4) the extension line.

3. The printing press delivery unit of claim 2, wherein: slewing mechanism (8) include with pivot (81), the fixed connection of the coaxial setting of tensioning roller (4) in driven gear (84) at pivot (81) both ends, with driven gear (84) engaged driving gear (83) and with rotation motor (82) that driving gear (83) are connected, the casing of rotating motor (82) is fixed in on mounting bracket (1), the output shaft with driving gear (83) coaxial coupling, press the cylinder body fixed connection of paper cylinder (7) in on pivot (81).

4. The printing press delivery unit of claim 1, wherein: an air cavity (51) is arranged inside the roller of the paper receiving roller (5), a plurality of air holes (52) are formed between the air cavity (51) and the outer wall of the paper receiving roller (5), an air pipe (53) is connected to the air cavity (51), and an air suction pump (54) is connected to the air pipe (53).

5. The printing press delivery unit of claim 1, wherein: connect paper roll (5) one side to be equipped with and spout mucilage binding and put (9), spout mucilage binding and put (9) include with connect slide rail (91) that paper roll (5) are parallel, slide set up in slider (92) on slide rail (91), connect in shower nozzle (97) on slider (92), connect in glue pipe (98) on shower nozzle (97), locate glue pipe (98) are kept away from glue bucket (10) of shower nozzle (97) one end and connect in glue pump (99) are glued in taking out on glue pipe (98).

6. The printing press delivery unit of claim 5, wherein: be equipped with on slider (92) and spout gluey cylinder (96), the cylinder body and the piston rod that spout gluey cylinder (96) are connected respectively slider (92) and shower nozzle (97), the piston rod that spouts gluey cylinder (96) is flexible along the direction of being close to or keeping away from paper receiving roller (5).

7. The printing press delivery unit of claim 1, wherein: former paper frame (2) rotate connect in on mounting bracket (1), and the rotation axis of former paper frame (2) with tensioning roller (4) are parallel, be equipped with the drive on mounting bracket (1) former paper frame (2) pivoted roll change mechanism (3).

8. The printing press delivery unit of claim 7, wherein: the roll changing mechanism (3) comprises a roll changing shaft (31) connected to the base paper frame (2), a roll changing motor (32) fixed to the mounting frame (1), a notched disc (33) coaxially connected to an output shaft of the roll changing motor (32), and a grooved wheel (35) coaxially connected to the roll changing shaft (31), wherein the grooved wheel (35) comprises a plurality of arc sections (351) matched with the notched disc (33) and notches (352) arranged at intervals with the arc sections (351); and a rotating pin (34) matched with the notch (352) is arranged at the notch position of the notch disc (33).

9. A rotary press, characterized in that: a web receiving unit comprising a printing press as claimed in any one of claims 1 to 8.