CN214391255U - Paper cleaning device and paper conveying equipment - Google Patents

Abstract

The utility model relates to a paper dust collecting equipment technical field specifically discloses a paper cleaning device and pass paper equipment, and this paper cleaning device includes: a base; the rotating frame is rotatably arranged on the base so as to drive the dust removal roller assembly to be close to or far away from the conveying assembly for conveying the paper; the limiting assembly is configured to adjust the limit position of the rotating frame, and when the rotating frame rotates to the limit position, the distance between the dedusting roller assembly and the conveying assembly is minimum; and the elastic floating assembly enables the dust removal roller assembly to keep in contact with the paper. The utility model discloses a dust removal roller subassembly glues the adnexed attachment on with the paper and gets to avoid improving production efficiency because of phenomenon such as false retrieval that reasons such as paper hair caused. The paper cleaning device guarantees the clean cleanliness of the dust removal roller component and ensures that the paper cleaning device cannot clamp paper through the limiting component and the elastic floating component.

Description

Paper cleaning device and paper conveying equipment

Technical Field

The utility model relates to a paper dust collecting equipment technical field especially relates to a paper cleaning device and pass paper equipment.

Background

At present, in the printing industry, after a die-cutting machine runs for a long time, a die-cutting tool generates static electricity due to mutual friction between paper sheets because of poor quality, non-sharp cutting edge and non-uniform die-cutting pressure, and adsorbs attachments such as paper wool and dust on the surfaces of paper products. When the product inspection machine is used for inspecting the surface of paper, false detection can be caused by attachments such as paper wool and the like, and the attachments can influence the quality of code spraying.

In the prior art, attachments on the surface of paper are generally removed by adopting a plasma rod air blowing dust removal mode, a plasma rod air blowing dust removal device is directly arranged at the front end of a product inspection machine, ion beams generated by the plasma rod air blowing dust removal device are irradiated on the surface of the paper when the plasma rod air blowing dust removal device works, static electricity on the surface of the paper is removed, and meanwhile air pipes blow air to blow off the attachments. The use of present plasma stick dust collecting equipment that blows has the limitation, when the paper feed speed is very fast, the ion beam has not been with static elimination yet, and the paper just is carried at a high speed past, leads to unable blowing off the attachment, if examine article machine low-speed detection, the ion beam can detach static, but the trachea can blow attachment etc. to all directions, leads to being full of the attachment in the detection box, and the attachment falls on detection camera lens or reflector panel, influences the detection effect who examines the article machine.

Therefore, there is a need for a paper cleaning device and a paper conveying apparatus to solve the above-mentioned problems that the attachments on the surface of the paper are difficult to remove, and the removed attachments affect the detection effect of the inspection machine.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a paper cleaning device to solve the attachment on paper surface and be difficult to get rid of, and the attachment that is got rid of influences the problem of examining the detection effect of article machine, make paper cleaning device be applicable to the paper of different thickness simultaneously, and avoid paper cleaning device to take place the card paper phenomenon.

To achieve the purpose, the utility model adopts the following technical proposal:

a paper cleaning device comprising:

a base;

the rotating frame is rotatably arranged on the base to drive the dust removing roller assembly to be close to or far away from the conveying assembly for conveying the paper;

the limiting assembly is connected to the rotating frame and the base and is configured to adjust the limit position of the rotating frame, and when the rotating frame rotates to the limit position, the distance between the dedusting roller assembly and the conveying assembly is minimum;

a resilient floating assembly compressively coupled to the turret and the base to maintain the dust removal roller assembly in contact with the paper.

Preferably, the elastic floating assembly includes:

one end of the connecting column is connected to the base, and the other end of the connecting column penetrates through the rotating frame in a sliding mode;

the first spring is sleeved on the connecting column, the first spring is arranged between the base and the rotating frame, and two ends of the first spring are respectively abutted against the base and the rotating frame.

Preferably, the limiting assembly comprises:

the base is provided with a first threaded hole, the screw is in threaded connection with the first threaded hole, and the screw penetrates through the rotating frame in a sliding mode;

the stopping part is connected with one end of the screw rod and located on one side, away from the base, of the rotating frame, and when the rotating frame rotates to the limit position, the stopping part is abutted to the rotating frame.

Preferably, the dust removal roller assembly comprises:

the dust sticking roller is rotationally arranged on the rotating frame around the axis of the dust sticking roller and can be abutted against the paper;

and the gluing roller is rotationally arranged on the rotating frame around the axis of the gluing roller and is configured to adhere attachments on the dust gluing roller.

Preferably, the dust-binding roller comprises:

the two ends of the first shaft are respectively arranged on the rotating frame;

the first roller is rotationally connected to the first shaft through a first bearing;

and the silica gel layer is coated outside the first roller.

Preferably, two first U-shaped grooves are formed in the rotating frame, the two ends of the first shaft are arranged in the two first U-shaped grooves respectively, the paper cleaning device further comprises a jackscrew which is detachably connected to the groove wall of each first U-shaped groove and extends into the first U-shaped grooves to limit the first shaft to be separated from the first U-shaped grooves.

Preferably, the glue roller comprises:

two ends of the second shaft are respectively arranged on the rotating frame;

the second roller is rotationally connected to the second shaft through a second bearing;

and the adhesive layer is wound outside the second roller and can be peeled off from the second roller layer by layer.

Preferably, two second U type grooves have been seted up on the rotating turret, the both ends of secondary shaft set up respectively in two the second U type inslot, just the secondary shaft can be followed the degree of depth direction in second U type groove slides, the dust removal roller subassembly still includes the tight subassembly in top, the tight subassembly in top connect in the rotating turret, and with the secondary shaft butt, so that glue the rubber roll global with glue the global butt of dirt roller.

Preferably, the tightening assembly comprises:

the fixed block is connected with a notch of the second U-shaped groove, a second threaded hole is formed in the fixed block, and the axial direction of the second threaded hole is consistent with the depth direction of the second U-shaped groove;

the adjusting bolt is screwed in the second threaded hole;

and the second spring penetrates through the second threaded hole and is abutted against the end surface of the adjusting bolt and the peripheral surface of the second shaft.

Another object of the present invention is to provide a paper feeding device for providing clean paper for a product inspection machine.

To achieve the purpose, the utility model adopts the following technical proposal:

a paper conveying apparatus comprising the paper cleaning device as described above, further comprising a conveying assembly configured to convey a sheet of paper, the dust removing roller assembly of the paper cleaning device and the conveying assembly being located on both sides of the sheet of paper, respectively.

The utility model has the advantages that:

the utility model discloses a dust removal roller subassembly self has viscidity characteristics, glues attachments such as adnexed paper hair and dust on the paper and gets to avoid phenomenon such as false retrieval because of reasons such as paper hair cause, thereby improve production efficiency. Meanwhile, the paper cleaning device guarantees the cleanness of the dust removal roller component through the limiting component and the elastic floating component, and ensures that the paper cleaning device cannot block paper, so that the shutdown risk is avoided.

Drawings

Fig. 1 is a schematic structural view of a paper conveying apparatus provided in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a paper cleaning device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of another view angle of the paper cleaning device according to the embodiment of the present invention;

fig. 4 is a partial schematic structural view of another view angle of the paper cleaning device according to the embodiment of the present invention.

In the figure:

1. a base; 11. a base plate; 12. connecting blocks;

2. a rotating frame; 21. a rotating plate; 22. a support plate; 221. a first U-shaped groove; 222. a second U-shaped groove;

3. a dust removal roller assembly; 31. a dust-sticking roller; 311. a first shaft; 312. a silica gel layer; 32. gluing a rubber roller; 321. a second shaft; 322. an adhesive layer; 33. jacking the assembly; 331. a fixed block; 332. adjusting the bolt; 333. a second spring;

4. a limiting component; 41. a screw; 42. a stopper portion;

5. an elastic floating assembly; 51. connecting columns; 52. a first spring;

6. rotating the column;

10. and a conveying assembly.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

The present invention is limited to certain orientation words, and when no opposite explanation is given, the used orientation words are "upper", "lower", "left", "right", "inner" and "outer", and these orientation words are adopted for easy understanding, and therefore do not constitute a limitation to the scope of the present invention.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the present embodiment provides a paper conveying apparatus for conveying paper and providing clean paper to a product inspection machine. The paper conveying equipment further comprises a conveying assembly 10 and a paper cleaning device, wherein the conveying assembly 10 is used for conveying clean paper, the paper cleaning device is used for removing paper dust, dust and other attachments on the surface of the paper, the paper cleaning device comprises a dust removing roller wheel assembly 3, the dust removing roller wheel assembly 3 is used for adhering the attachments on the surface of the paper, and the dust removing roller wheel assembly 3 and the conveying assembly 10 are respectively positioned on two sides of the paper so as to realize conveying and cleaning of the paper.

As shown in fig. 2 and fig. 3, the paper cleaning device provided in this embodiment further includes a base 1 and a rotating frame 2, the dust removing roller assembly 3 is rotatably disposed on the rotating frame 2, and the rotating frame 2 is rotatably disposed on the base 1 to drive the dust removing roller assembly 3 to approach or be away from the conveying assembly 10 for conveying paper. Specifically, when the thickness of the paper is different or two sheets of paper are overlapped and conveyed, the rotating frame 2 can be rotated to change the distance between the dust removing roller wheel assembly 3 and the conveying assembly 10, so that the paper is not clamped, and the stop risk is avoided.

In the conveying process, when the thickness of the paper is thickened, in order to automatically adjust the distance between the dust removing roller assembly 3 and the conveying assembly 10 according to the thickness of the conveyed paper and ensure that the dust removing roller assembly 3 has certain pressure on the paper, the paper cleaning device further comprises a limiting assembly 4 and an elastic floating assembly 5.

Spacing subassembly 4 and the subassembly 5 that floats of elasticity all connect in rotating turret 2 and base 1, and when rotating turret 2 rotated extreme position, the interval of dust removal roller subassembly 3 and conveying component 10 was minimum, can convey the paper that thickness is little between dust removal roller subassembly 3 and the conveying component 10. The elastic floating member 5 is compressively coupled to the rotating frame 2 and the base 1 to maintain the dust removing roller assembly 3 in contact with the paper sheet, thereby allowing the dust removing roller assembly 3 to effectively adhere to the surface of the paper sheet. Meanwhile, when the paper becomes thick due to manufacturing errors or two pieces of paper are overlapped and conveyed, the elastic floating assembly 5 can be continuously compressed, so that the distance between the dust removing roller assembly 3 and the conveying assembly 10 is increased, the paper is allowed to pass through, the paper cannot be clamped, and the stop risk is avoided.

This embodiment has sticky characteristics through dust removal roller subassembly 3 self, glues attachments such as the paper hair that adheres to on the paper and dust and gets to avoid phenomenon such as false retrieval because of reasons such as paper hair cause, improve production efficiency. Meanwhile, the paper cleaning device ensures the cleanness of the dust removing roller wheel assembly 3 through the limiting assembly 4 and the elastic floating assembly 5 and ensures that the paper cleaning device cannot block paper, so that the shutdown risk is avoided.

As shown in fig. 3, the base 1 includes a bottom plate 11 and two connection blocks 12 arranged at intervals, the connection blocks 12 are connected to one side of the bottom plate 11 close to the rotating frame 2, and the connection blocks 12 are provided with first connection holes. The rotating frame 2 comprises a rotating plate 21 and support plates 22 connected to two ends of the rotating plate 21, the support plates 22 are perpendicularly connected with the rotating plate 21, second connecting holes are formed in the support plates 22, and the rotating column 6 penetrates through the first connecting holes and the second connecting holes, so that the support plates 22 are rotatably connected with the connecting blocks 12, namely the rotating frame 2 is rotatably connected to the base 1.

As shown in fig. 2, the elastic floating assembly 5 includes a connection column 51 and a first spring 52, wherein one end of the connection column 51 is connected to the bottom plate 11 of the base 1, and the other end is slidably inserted through the rotating plate 21 of the rotating frame 2. The connecting column 51 is sleeved with the first spring 52, the first spring 52 is disposed between the bottom plate 11 of the base 1 and the rotating plate 21 of the rotating frame 2, and two ends of the first spring 52 are respectively abutted against the base 1 and the rotating frame 2. Preferably, two sets of elastic floating assemblies 5 are arranged along the arrangement direction of the two support plates 22 to improve the stability of the paper cleaning device.

The limiting assembly 4 comprises a screw rod 41 and a stopping portion 42, a first threaded hole is formed in the bottom plate 11 of the base 1, the screw rod 41 is in threaded connection with the first threaded hole, and the screw rod 41 penetrates through the rotating frame 2 in a sliding mode. The stopping portion 42 is connected to one end of the screw rod 41, the stopping portion 42 is located on one side of the rotating frame 2 away from the base 1, and when the rotating frame 2 rotates to the limit position, the stopping portion 42 abuts against the rotating plate 21 of the rotating frame 2. The screw 41 is rotated to adjust the distance between the stopping portion 42 and the bottom plate 11 of the base 1, thereby achieving the purpose of adjusting the limit position.

Preferably, three elongated holes are formed in the rotating plate 21, the extending direction of each elongated hole is consistent with the radial direction of rotation of the rotating plate 21, and the connecting column 51 and the screw rod 41 are respectively slidably inserted into the elongated holes, so that the connecting column 51 and the screw rod 41 respectively slide relative to the rotating plate 21 in the rotation process of the rotating plate 21.

As shown in fig. 2 and 3, the dust removing roller assembly 3 includes a dust adhering roller 31 and an adhesive roller 32, and both ends of the dust adhering roller 31 and the adhesive roller 32 are rotatably disposed on the two support plates 22 of the rotating frame 2 around their axes. The dust-sticking roller 31 can be brought into contact with the paper, and the outer peripheral surface of the dust-sticking roller 32 is brought into contact with the outer peripheral surface of the dust-sticking roller 31, so that the dust-sticking roller 32 sticks to the attached matter on the dust-sticking roller 31. It will be appreciated that the tackiness of the adhesive roller 32 is greater than the tackiness of the dust roller 31 to adhere the adherent on the dust roller 31. As shown in fig. 1, after the paper conveying apparatus is turned on, the paper passes between the dust-sticking roller 31 and the conveying assembly 10, the dust-sticking roller 31 rotates under the action of friction force with the paper, and the dust-sticking roller 32 rotates under the action of friction force with the dust-sticking roller 31, so that the paper is cleaned. The adhesive on the paper is adhered by the dust-binding roller 31, and the adhesive of the adhesive roller 32 is larger than that of the dust-binding roller 31, so that the adhesive roller 32 adheres the adhesive on the dust-binding roller 31 to the surface, thereby achieving the purpose of adhering the adhesive. It will be appreciated that the rotation axis of the dust-binding roller 31 and the rotation axis of the glue roller 32 are parallel to the rotation axis of the rotating frame 2, so that the distance between the dust-binding roller 31 and the conveying assembly 10 can be adjusted after the rotating frame 2 rotates, and the outer circumferential surface of the glue roller 32 is in contact with the outer circumferential surface of the dust-binding roller 31.

As shown in fig. 2 and 3, preferably, the dust-binding roller 31 includes a first shaft 311, a first roller and a silica gel layer 312, two ends of the first shaft 311 are respectively disposed on the two support plates 22 of the rotating frame 2, and the first roller is rotatably connected to the first shaft 311 through a first bearing. The silicone layer 312 covers the first roller to adhere the adhesive on the paper. When the viscosity of the silica gel layer 312 is reduced due to excessive adhering impurities, the impurities can be removed by soaking the soft cloth in alcohol for wiping, so that the viscosity is increased.

As shown in fig. 4, in order to rapidly detach and replace the dust-binding roller 31, two first U-shaped grooves 221 are respectively formed on two supports of the rotating frame 2, and two ends of the first shaft 311 are respectively disposed in the two first U-shaped grooves 221. The paper cleaning device further comprises a top thread which is detachably connected to the wall of the first U-shaped groove 221 and extends into the first U-shaped groove 221 so as to limit the first shaft 311 from being separated from the first U-shaped groove 221. When the dust-binding roller 31 needs to be disassembled, the top thread is taken down, and the first shaft 311 is taken out from the first U-shaped groove 221.

Preferably, the adhesive roller 32 includes a second shaft 321, a second roller and an adhesive layer 322, two ends of the second shaft 321 are respectively disposed on the two support plates 22 of the rotating frame 2, the second roller is rotatably connected to the second shaft 321 through a second bearing, and the adhesive layer 322 is wound outside the second roller and can be peeled off from the second roller layer by layer. When too much paper fluff or dust is accumulated on the surface of the adhesive roller 32, a part of the adhesive layer 322 can be manually cut, and a new adhesive part is leaked out for continuous use. Preferably, the viscose layer 322 includes two-layer pearlized film and sets up the double faced adhesive tape between two-layer pearlized film, and the double faced adhesive tape is used for adhesion debris, and pearlized film is used for avoiding the double faced adhesive tape between the adjacent two-layer viscose layer 322 to bond.

The rotating frame 2 is provided with two second U-shaped grooves 222, two ends of the second shaft 321 are respectively disposed in the two second U-shaped grooves 222, and the second shaft 321 can slide along the depth direction of the second U-shaped grooves 222.

As shown in fig. 4, when the adhesive layer 322 is peeled off from the second roller layer by layer, the diameter of the adhesive roller 32 is gradually reduced, and in order to ensure that the circumferential surface of the adhesive roller 32 is constantly in contact with the dust-binding roller 31, the dust removing roller assembly 3 further includes a tightening assembly 33, the tightening assembly 33 is connected to the rotating frame 2 and is abutted against the second shaft 321, so that the circumferential surface of the adhesive roller 32 is abutted against the circumferential surface of the dust-binding roller 31.

Specifically, the tightening assembly 33 includes a fixing block 331, an adjusting bolt 332, and a second spring 333, where the fixing block 331 is connected to a notch of the second U-shaped groove 222, the fixing block 331 is provided with a second threaded hole, and an axial direction of the second threaded hole is consistent with a depth direction of the second U-shaped groove 222. The adjusting bolt 332 is screwed into the second screw hole, and the second spring 333 is inserted into the second screw hole and abuts against the end surface of the adjusting bolt 332 and the circumferential surface of the second shaft 321. After the diameter of the glue roller 32 is reduced, the adjusting bolt 332 is rotated to keep the second spring 333 in a compressed state, so that the end surface of the adjusting bolt 332 is continuously abutted with the circumferential surface of the second shaft 321, and the circumferential surface of the glue roller 32 is ensured to be contacted with the dust-binding roller 31 at any time. When all the adhesive layers 322 on the adhesive roller 32 are used up, the fixing block 331 is removed and a new adhesive roller 32 can be replaced.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A paper cleaning device, comprising:

a base (1);

the paper conveying device comprises a rotating frame (2) and a dust removing roller assembly (3), wherein the dust removing roller assembly (3) is rotatably arranged on the rotating frame (2) and is configured to be adhered with attachments on the surface of paper, and the rotating frame (2) is rotatably arranged on a base (1) to drive the dust removing roller assembly (3) to be close to or far away from a conveying assembly (10) for conveying the paper;

a limiting assembly (4) connected to the rotating frame (2) and the base (1) and configured to adjust the limit position of the rotating frame (2), when the rotating frame (2) rotates to the limit position, the distance between the dedusting roller assembly (3) and the conveying assembly (10) is minimum;

an elastic floating assembly (5) compressively connected to the rotating frame (2) and the base (1) to maintain the dust removing roller assembly (3) in contact with the paper.

2. The paper cleaning device according to claim 1, characterized in that the elastically floating member (5) comprises:

one end of the connecting column (51) is connected to the base (1), and the other end of the connecting column (51) penetrates through the rotating frame (2) in a sliding mode;

the connecting column (51) is sleeved with the first spring (52), the first spring (52) is arranged between the base (1) and the rotating frame (2), and two ends of the first spring (52) are respectively abutted to the base (1) and the rotating frame (2).

3. Paper cleaning apparatus according to claim 1, characterized in that the stop assembly (4) comprises:

the base (1) is provided with a first threaded hole, the screw (41) is in threaded connection with the first threaded hole, and the screw (41) penetrates through the rotating frame (2) in a sliding mode;

the stopping portion (42) is connected with one end of the screw rod (41), the stopping portion (42) is located on one side, away from the base (1), of the rotating frame (2), and when the rotating frame (2) rotates to the limit position, the stopping portion (42) is abutted to the rotating frame (2).

4. Paper cleaning device according to claim 1, characterized in that the dust-removing roller assembly (3) comprises:

the dust sticking roller (31) is arranged on the rotating frame (2) in a rotating mode around the axis of the dust sticking roller and can be abutted against the paper;

the gluing roller (32) is arranged on the rotating frame (2) in a rotating mode around the axis of the gluing roller and is configured to adhere attachments on the dust gluing roller (31).

5. Paper cleaning device according to claim 4, characterized in that the dust-binding roller (31) comprises:

a first shaft (311) having both ends respectively provided on the rotating frame (2);

the first roller is rotationally connected to the first shaft (311) through a first bearing;

and the silica gel layer (312) is coated outside the first roller.

6. The paper cleaning device as claimed in claim 5, wherein the rotating frame (2) is provided with two first U-shaped grooves (221), two ends of the first shaft (311) are respectively disposed in the two first U-shaped grooves (221), and the paper cleaning device further comprises a jackscrew detachably connected to a groove wall of the first U-shaped groove (221) and extending into the first U-shaped groove (221) to limit the first shaft (311) from being separated from the first U-shaped groove (221).

7. The paper cleaning device as claimed in claim 4, characterized in that the glue roller (32) comprises:

a second shaft (321) having both ends respectively provided on the rotating frame (2);

the second roller is rotationally connected to the second shaft (321) through a second bearing;

and the adhesive layer (322) is wound outside the second roller and can be peeled off from the second roller layer by layer.

8. The paper cleaning device according to claim 7, wherein the rotating frame (2) is provided with two second U-shaped grooves (222), two ends of the second shaft (321) are respectively arranged in the two second U-shaped grooves (222), the second shaft (321) can slide along the depth direction of the second U-shaped grooves (222), the dust removal roller assembly (3) further comprises a tightening assembly (33), and the tightening assembly (33) is connected to the rotating frame (2) and is abutted against the second shaft (321) so that the circumferential surface of the gluing roller (32) is abutted against the circumferential surface of the dust gluing roller (31).

9. The paper cleaning device of claim 8, wherein the jacking assembly (33) comprises:

the fixed block (331) is connected to a notch of the second U-shaped groove (222), a second threaded hole is formed in the fixed block (331), and the axial direction of the second threaded hole is consistent with the depth direction of the second U-shaped groove (222);

an adjusting bolt (332) screwed in the second threaded hole;

and a second spring (333) that is inserted into the second threaded hole and abuts against the end surface of the adjusting bolt (332) and the circumferential surface of the second shaft (321).

10. A paper transfer apparatus comprising the paper sheet cleaning device of any one of claims 1 to 9, the paper transfer apparatus further comprising a conveying assembly (10), the conveying assembly (10) being configured to convey a paper sheet, the dust removing roller assembly (3) and the conveying assembly (10) of the paper sheet cleaning device being located on both sides of the paper sheet, respectively.

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