A rotary positioning cutting device for measuring safety indicators in cigarette paper

Abstract

The present invention belongs to the technical field of cutting equipment, and specifically relates to a rotary positioning cutting device for measuring safety indicators in cigarette paper, comprising a base, a card base and a pressing block, the card base comprising a sleeve and a card block group, the card block group comprising a first L-shaped card block, a second L-shaped card block, a third L-shaped card block and a fourth L-shaped card block, the card block group is fixedly connected to the sleeve, a straight bar is vertically arranged on the back of the first L-shaped card block, a plurality of arc-shaped positioning bosses are integrally formed on the lower end surface of the sleeve, the base is provided with positioning grooves at positions corresponding to the arc-shaped positioning bosses, a rotating shaft is passed through the sleeve, the rotating shaft is fixedly connected to the base, a paper cutter is hinged on the front end surface and the right end surface of the base, a handle is fixedly connected to the free end of the paper cutter, and a magnet is fixedly arranged on the pressing block. The purpose is to efficiently and accurately cut four commonly used cigarette papers that need to be cut.

Description

Technical Field

[0001] The invention belongs to the technical field of cutting equipment, and in particular relates to a rotary positioning cutting device for measuring safety indicators in cigarette paper. Background Art

[0002] In experiments such as the determination of safety indicators in cigarette paper, including the determination of phthalates and tributyl phosphate in cigarette paper (gas chromatography-mass spectrometry), the determination of solvent residues in cigarette paper (headspace-gas chromatography-mass spectrometry), and the determination of formaldehyde and acetaldehyde in cigarette paper (high performance liquid chromatography), it is necessary to cut the cigarette paper and cut specific parts of the cigarette paper into appropriate sizes.

[0003] Among the cigarette papers that need to be cut, there are mainly four types as shown in the following table:

[0004] Paper material Location Size (cm) Strip wrapping paper Central area of ​​the front of the wrapper 22*5.5 Rigid box packaging paper Contains main packaging surface 22*5.5 Cigarette tipping paper Contains a single side 20*4 Cigarette lining paper Contains a single side 17*10

[0005] The above four types of cigarette papers that need to be cut have different shapes and sizes, and the positions and sizes that need to be cut are also different. Due to the lack of professional cutting tools, paper cutters are commonly used to cut cigarette papers. This results in the need to calculate the cutting position before cutting the cigarette papers. When cutting, at least three cuttings are required to complete the process, resulting in low efficiency and low precision. Summary of the invention

[0006] The purpose of the present invention is to provide a rotary positioning cutting device for measuring safety indicators in cigarette papers, which can efficiently and accurately cut four commonly used cigarette papers that need to be cut.

[0007] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0008] A rotary positioning cutting device for measuring safety indicators in cigarette paper comprises a base, a card base and a pressing block, the card base comprises a sleeve and a card block group, the card block group comprises a first L-shaped card block, a second L-shaped card block, a third L-shaped card block and a fourth L-shaped card block, the card block group is fixedly connected to the sleeve, a straight bar is vertically provided on the back of the first L-shaped card block, a plurality of arc-shaped positioning bosses are integrally formed on the lower end surface of the sleeve, the base is provided with positioning grooves at positions corresponding to the arc-shaped positioning bosses, a rotating shaft is passed through the sleeve, the rotating shaft is fixedly connected to the base, a paper cutter is hingedly connected to the front end surface and the right end surface of the base, a handle is fixedly connected to the free end of the paper cutter, and a magnet is fixedly provided on the pressing block.

[0009] In a further embodiment, the pressing block is also covered with a rubber sleeve. Such a structural design prevents the pressing block from directly contacting the cigarette paper through the rubber sleeve, thereby preventing the cigarette paper from being damaged during the process of taking and placing the pressing block, thereby affecting the subsequent detection accuracy.

[0010] It is further defined that a convex ring is integrally formed at the lower part of the inner wall of the sleeve, a circular baffle is integrally formed at the upper end of the rotating shaft, and a compression spring is sleeved between the convex ring and the circular baffle on the rotating shaft. With such a structural design, after the sleeve is rotated into place, the compression spring can press the block group against the base to avoid a gap between the block group and the base, causing the cigarette paper to be stuck in the gap between the base and the block group when it is against the block group, resulting in deviation in the positioning of the cigarette paper, further improving the positioning accuracy.

[0011] It is further defined that the upper end surface of the convex ring is provided with an annular groove, a thrust cylindrical roller bearing is installed in the annular groove, and the lower end surface of the compression spring rests on the thrust cylindrical roller bearing. Such a structural design reduces the distortion of the compression spring when the sleeve rotates by replacing the convex ring with the thrust cylindrical roller bearing in contact with the compression spring, thereby extending the service life of the compression spring.

[0012] It is further defined that a ball is disposed on the lower end surface of the arc-shaped positioning boss. With such a structural design, when the sleeve rotates, the ball contacts the base instead of the arc-shaped positioning boss, so that the sleeve rotates more smoothly.

[0013] It is further defined that a handle is fixedly provided on the sleeve. With such a structural design, when the sleeve is rotated, the sleeve can be pulled upward by the handle to reduce the friction between the holder and the base, and then rotated.

[0014] It is further defined that a rectangular fixing column is integrally formed at the lower end of the rotating shaft, a threaded column is integrally formed at the lower end of the rectangular fixing column, a rectangular through hole matching the rectangular fixing column is formed on the base, a blind hole is further formed on the lower end surface of the base at a position corresponding to the rectangular through hole, a fixing nut is screwed on the threaded column, and the fixing nut is located in the blind hole. The rotating shaft can limit the rotation of the rotating shaft through the mutual cooperation of the rectangular fixing column and the rectangular through hole, and the fixing nut cooperates with the rotating shaft to realize the axial fixation of the rotating shaft, thereby completing the fixed connection between the rotating shaft and the base. With such a structural design, when installing, the rectangular fixing column is directly inserted into the rectangular through hole, and then the fixing nut is tightened, which is convenient for installation.

[0015] It is further defined that a notch is provided on the lower end surface where the first L-shaped card block is connected to the straight strip. With such a structural design, when cutting the unfolded standard hard box packaging paper, one corner of the unfolded standard hard box packaging paper can be inserted into the notch, so that the left end surface and the rear end surface of the unfolded standard hard box packaging paper can be attached to the card block group, which is convenient for positioning the unfolded standard hard box packaging paper.

[0016] It is further defined that the fourth L-shaped card block is also integrally formed with an oblique bar, and the free end of the oblique bar is integrally formed with a horizontal bar. With such a structural design, when cutting the unfolded standard strip packaging paper, the oblique bar and the horizontal bar contact the edge of the unfolded standard strip packaging paper, thereby increasing the contact area between the card seat group and the unfolded standard strip packaging paper, and making the positioning of the unfolded standard strip packaging paper more accurate.

[0017] It is further defined that the base is fixedly provided with a first hinge seat, the first hinge seat is hinged with a connecting rod, the free end of the connecting rod is hinged with the pressing block, and the free end of the connecting rod is also fixed with an arc block. With such a structural design, when removing the pressing block from the cigarette paper, the arc block can be grasped by hand and pulled upward, and the lever principle of the connecting rod is used to drive the pressing block to rotate clockwise around the first hinge seat, so that the pressing block and the base can be separated, which is more labor-saving.

[0018] The invention adopting the above technical solution has the following advantages:

[0019] 1. The cigarette paper is positioned by a replaceable card seat, and the cigarette paper is pressed and fixed by a pressing block equipped with a magnet, so as to realize the cutting of four commonly used cigarette papers, improve the cutting efficiency and the cutting accuracy;

[0020] 2. The card block group is pressed by the compression spring to avoid a gap between the card block group and the base, so that the cigarette paper is stuck in the gap between the base and the card block group when it is against the card block group, resulting in a deviation in the positioning of the cigarette paper, thereby further improving the positioning accuracy;

[0021] 3. Through the mutual matching of the arc-shaped positioning boss and the positioning groove, the rotational positioning between each block group and the base is realized, making the positioning more accurate;

[0022] 4. The arc-shaped positioning boss allows the block group to separate from the upper end surface of the base when the sleeve rotates, avoiding friction between the block group and the base, thereby causing a gap between the block group and the base and affecting the positioning accuracy;

[0023] 5. The notch improves the adaptability of the card holder to the unfolded standard hard box packaging paper and improves the positioning accuracy;

[0024] 6. The contact area between the edge of the unfolded standard strip packaging paper and the card seat is increased by oblique strips and horizontal strips, thereby improving the positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings;

[0026] Figure 1It is a structural schematic diagram of an embodiment of a rotary positioning cutting device for measuring safety indicators in cigarette paper of the present invention;

[0027] Figure 2 The structure of the card seat in the embodiment of the rotary positioning cutting device for measuring the safety index of cigarette paper of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 3 The structure of the card seat in the embodiment of the rotary positioning cutting device for measuring the safety index of cigarette paper of the present invention is shown in FIG. Figure 2 ;

[0029] Figure 4 It is a cross-sectional structural schematic diagram of an embodiment of a rotary positioning cutting device for measuring safety indicators in cigarette paper of the present invention;

[0030] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0031] Figure 6 It is a structural schematic diagram of a base in an embodiment of a rotary positioning cutting device for measuring safety indicators in cigarette paper of the present invention;

[0032] Figure 7 It is a structural schematic diagram of the rotating shaft part in an embodiment of a rotating positioning cutting device for measuring safety indicators in cigarette paper of the present invention;

[0033] Figure 8 It is a structural schematic diagram of a connecting rod and a pressing block part in an embodiment of a rotary positioning cutting device for measuring safety indicators in cigarette paper of the present invention;

[0034] Fig. 9 It is a structural schematic diagram of a first cutting of an unfolded standard strip of packaging paper in an embodiment of a rotary positioning cutting device for measuring safety indicators in cigarette paper of the present invention;

[0035] Fig.10 It is a structural schematic diagram of a rotary positioning cutting device for measuring safety indexes in cigarette paper according to the present invention, in which a second cutting is performed on an unfolded standard strip of packaging paper;

[0036] Fig.11 It is a structural schematic diagram of a first cutting of an unfolded standard hard box packaging paper in an embodiment of a rotary positioning cutting device for measuring safety indicators in cigarette paper of the present invention;

[0037] Fig.12 It is a structural schematic diagram of a rotary positioning cutting device for measuring safety indexes in cigarette paper according to an embodiment of the present invention, which performs a second cutting on an unfolded standard hard box packaging paper;

[0038] Fig.13 It is a structural schematic diagram of cutting cigarette tipping paper in an embodiment of a rotary positioning cutting device for measuring safety indicators in cigarette paper of the present invention;

[0039] Fig.14 It is a structural schematic diagram of cutting cigarette liner paper in an embodiment of a rotary positioning cutting device for measuring safety indicators in cigarette paper of the present invention;

[0040] The main component symbols are described as follows:

[0041] Base 1, unfolded standard strip wrapping paper 101, unfolded standard hard box wrapping paper 102, cigarette tipping paper 103, cigarette lining paper 104,

[0042] Card holder 2, first L-shaped card block 201, second L-shaped card block 202, third L-shaped card block 203, fourth L-shaped card block 204, oblique strip 2041, horizontal strip 2042,

[0043] Straight bar 205, gap 2050,

[0044] Sleeve 21, arc-shaped positioning boss 211, positioning groove 2110, convex ring 212,

[0045] Rotating shaft 22, compression spring 220, circular baffle 221,

[0046] Thrust cylindrical roller bearing 23,

[0047] Rectangular fixing column 222, rectangular through hole 2220, threaded column 223, blind hole 2230, fixing nut 2231, handle 24,

[0048] Paper cutter 3, handle 31,

[0049] Connecting rod 4, first hinge seat 40, pressing block 41, arc block 42. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0051] like Figure 1 to Figure 14As shown, a rotary positioning cutting device for measuring safety indicators in cigarette paper of the present invention comprises a base 1, a card base 2 and a pressing block 41, the card base 2 comprises a sleeve 21 and a card block group, the card block group comprises a first L-shaped card block 201, a second L-shaped card block 202, a third L-shaped card block 203 and a fourth L-shaped card block 204, the card block group is fixedly connected to the sleeve 21, a straight bar 205 is vertically provided on the back of the first L-shaped card block 201, a plurality of arc-shaped positioning bosses 211 are integrally formed on the lower end surface of the sleeve 21, and four arc-shaped positioning bosses 211 are preferably provided in this embodiment, the base 1 is provided with positioning grooves 2110 at positions corresponding to the arc-shaped positioning bosses 211, a rotating shaft 22 is penetrated in the sleeve 21, the rotating shaft 22 is fixedly connected to the base 1, a paper cutter 3 is hingedly connected to the front end surface and the right end surface of the base 1, a handle 31 is fixedly connected to the free end of the paper cutter 3, and a magnet is fixedly provided on the pressing block 41.

[0052] A rubber sleeve is also provided on the pressing block 41. The rubber sleeve prevents the pressing block 41 from directly contacting with cigarette paper, and prevents the cigarette paper from being damaged during the process of taking and placing the pressing block 41, which affects the subsequent detection accuracy.

[0053] like Figure 5 As shown, a convex ring 212 is integrally formed at the lower part of the inner wall of the sleeve 21, a circular baffle 221 is integrally formed at the upper end of the rotating shaft 22, and a compression spring 220 is sleeved between the convex ring 212 and the circular baffle 221 of the rotating shaft 22. After the sleeve 21 is rotated into place, the compression spring 220 can press the block group against the base 1 to avoid a gap between the block group and the base 1, causing the cigarette paper to be stuck in the gap between the base 1 and the block group when leaning against the block group, resulting in deviation in the positioning of the cigarette paper, further improving the positioning accuracy.

[0054] like Figure 5 As shown, an annular groove is formed on the upper end surface of the convex ring 212, and a thrust cylindrical roller bearing 23 is installed in the annular groove, and the lower end surface of the compression spring 220 is pressed against the thrust cylindrical roller bearing 23. The thrust cylindrical roller bearing 23 replaces the convex ring 212 to contact the compression spring 220, thereby reducing the distortion of the compression spring 220 when the sleeve 21 rotates, and extending the service life of the compression spring 220.

[0055] A ball is disposed on the lower end surface of the arc-shaped positioning boss 211. When the sleeve 21 rotates, the ball contacts the base 1 instead of the arc-shaped positioning boss 211, so that the sleeve 21 rotates more smoothly.

[0056] A handle 24 is fixedly provided on the sleeve 21. When the sleeve 21 is rotated, the sleeve 21 can be pulled upward by the handle 24 to reduce the friction between the holder 2 and the base 1, and then rotated.

[0057] like Figure 6 and Figure 7As shown, a rectangular fixing column 222 is integrally formed at the lower end of the rotating shaft 22, and a threaded column 223 is integrally formed at the lower end of the rectangular fixing column 222. A rectangular through hole 2220 matching the rectangular fixing column 222 is provided on the base 1, and a blind hole 2230 is further provided on the lower end surface of the base 1 at a position corresponding to the rectangular through hole. A fixing nut 2231 is screwed on the threaded column 223, and the fixing nut 2231 is located in the blind hole 2230. The rotating shaft 22 can limit the rotation of the rotating shaft 22 through the cooperation between the rectangular fixing column 222 and the rectangular through hole 2220. The fixing nut 2231 cooperates with the rotating shaft 22 to achieve axial fixation of the rotating shaft 22, thereby completing the fixed connection between the rotating shaft 22 and the base 1. When installing, the rectangular fixing column 222 is directly inserted into the rectangular through hole 2220, and then the fixing nut 2231 is tightened, which is convenient for installation.

[0058] like Figure 3 As shown, a notch 2050 is provided at the lower end surface where the first L-shaped card block 201 is connected to the straight strip 205. When cutting the unfolded standard hard box packaging paper 102, one corner of the unfolded standard hard box packaging paper 102 can be inserted into the notch 2050, so that the left end surface and the rear end surface of the unfolded standard hard box packaging paper 102 can be attached to the card block group, which is convenient for positioning the unfolded standard hard box packaging paper 102.

[0059] like Figure 2 and Figure 3 As shown, the fourth L-shaped card block 204 is also integrally formed with an oblique strip 2041, and a horizontal strip 2042 is integrally formed at the free end of the oblique strip 2041. When cutting the unfolded standard strip packaging paper 101, the oblique strip 2041 and the horizontal strip 2042 contact the edge of the unfolded standard strip packaging paper 101, increasing the contact area between the card seat assembly and the unfolded standard strip packaging paper 101, so that the unfolded standard strip packaging paper 101 is positioned more accurately.

[0060] The upper end surfaces of the first L-shaped card block 201, the second L-shaped card block 202, the third L-shaped card block 203, the fourth L-shaped card block 204 and the straight strip 205 are all engraved with text for distinguishing which type of cigarette paper is used for positioning, so as to facilitate identification and use.

[0061] The base 1 is fixedly provided with a first hinge seat 40, the first hinge seat 40 is hinged with a connecting rod 4, the free end of the connecting rod 4 is hinged with a pressing block 41, and the free end of the connecting rod 4 is also fixedly provided with an arc block 42. When removing the pressing block 41 from the cigarette paper, the arc block 42 can be grasped by hand and pulled upward, and the lever principle of the connecting rod 4 can be used to drive the pressing block 41 to rotate clockwise around the first hinge seat 40, so as to realize the separation of the pressing block 41 from the base 1, which is more labor-saving.

[0062] In this embodiment, when cutting different cigarette papers, the holder 2 is rotated according to the different cigarette papers to be cut, so that the arc-shaped positioning boss 2050 is in the corresponding positioning groove 2110, and then the left end face and the rear end face of the cigarette paper are pressed against the corresponding position of the card block group, and then the pressing block 41 is used to fix the cigarette paper, and finally the paper cutter 3 is used to cut the cigarette paper;

[0063] It should be noted that when cutting the strips of wrapping paper (such as Fig. 9 As shown), the card base 2 is rotated so that the fourth L-shaped card block 204 is located at the front side of the base 1, and then the unfolded standard strip packaging paper 101 is placed on the base 1, so that the edge of the unfolded standard strip packaging paper 101 is against the fourth L-shaped card block 204, the oblique strip 2041 and the horizontal strip 2042, and then it is pressed and fixed by the pressing block 41, and then the unfolded standard strip packaging paper 101 is cut using two paper cutters 3; after the cutting is completed, the card base 2 is rotated 90° clockwise around the rotating shaft 22 so that the second L-shaped card block 202 is located at the front side of the base 1, and the unfolded standard strip packaging paper 101 that has been cut once is rotated 180° and then placed back on the base 1 (as shown). Fig.10 As shown), and against the inner side of the second L-shaped block 202, and then fixed with the pressing block 41, and then a second cutting is performed;

[0064] Similarly, when cutting the unfolded standard hard box packaging paper 102 (such as Fig.11 As shown), the card base 2 is rotated so that the straight strip 205 is located at the front side of the base 1, and then the edge of the unfolded standard hard box packaging paper 102 is pressed against the back of the first L-shaped card block 201 and the straight strip 205, and the corner of the unfolded standard hard box packaging paper 102 is inserted into the notch 2050, and then fixed with the pressing block 41, and cut with the paper cutter 3; then the card base 2 is rotated 90° counterclockwise around the rotating shaft 22, so that the second L-shaped card block 202 is located at the front side of the base 1, and the unfolded standard hard box packaging paper 102 that has been cut once is rotated 180° and placed back on the base 1 (as shown). Fig.12 As shown), and against the inner side of the second L-shaped block 202, and then fixed with the pressing block 41, and then a second cutting is performed;

[0065] When the cigarette tipping paper 103 is cut (such as Fig.13 As shown), rotate the card seat 2 so that the third L-shaped card block 203 is located at the front side of the base 1, and then the edge of the cigarette tipping paper 103 is pressed against the inner side of the third L-shaped card block 203, and after fixing it with the pressing block 41, cutting can be performed;

[0066] When the cigarette liner paper 104 is cut (such as Fig.14As shown), rotate the card seat 2 so that the second L-shaped card block 202 is located on the front side of the base 1, and then press the edge of the cigarette liner paper 104 against the inner side of the first L-shaped card block 201, fix it with the pressing block 41, and then cut it;

[0067] When cutting the cigarette tipping paper 103 and the cigarette lining paper 104, since both the cigarette tipping paper 103 and the cigarette lining paper 104 need to retain a single edge, after the cigarette tipping paper 103 and the cigarette lining paper 104 are fixed, only one cutting is required;

[0068] It should be noted that the one cutting mentioned in the present application refers to the two paper cutters 3 each cutting the cigarette paper once.

[0069] The above is a detailed introduction to a rotary positioning cutting device for measuring safety indicators in cigarette paper provided by the present invention. The description of the specific embodiment is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A rotary positioning cutting device for measuring safety indicators in cigarette paper, characterized in that: The invention comprises a base (1), a card seat (2) and a pressing block (41); the card seat (2) comprises a sleeve (21) and a card block group; the card block group comprises a first L-shaped card block (201), a second L-shaped card block (202), a third L-shaped card block (203) and a fourth L-shaped card block (204); the card block group is fixedly connected to the sleeve (21); a straight strip (205) is vertically provided on the back of the first L-shaped card block (201); and the lower end surface of the sleeve (21) is integrally formed. There are a plurality of arc-shaped positioning bosses (211), the base (1) is provided with positioning grooves (2110) at positions corresponding to the arc-shaped positioning bosses (211), a rotating shaft (22) is inserted into the sleeve (21), the rotating shaft (22) is fixedly connected to the base (1), a paper cutter (3) is hingedly connected to the front end surface and the right end surface of the base (1), the free end of the paper cutter (3) is fixedly connected to a handle (31), and a magnet is fixedly provided on the pressing block (41); A notch (2050) is provided on the lower end surface of the connection between the first L-shaped block (201) and the straight bar (205); The fourth L-shaped clamping block (204) is also integrally formed with an oblique strip (2041), and a horizontal strip (2042) is integrally formed at the free end of the oblique strip (2041).

2. A rotary positioning cutting device for measuring safety indicators in cigarette paper according to claim 1, characterized in that: The pressing block (41) is also sleeved with a rubber sleeve.

3. A rotary positioning cutting device for measuring safety indicators in cigarette paper according to claim 1, characterized in that: A convex ring (212) is integrally formed at the lower portion of the inner wall of the sleeve (21), a circular baffle (221) is integrally formed at the upper end of the rotating shaft (22), and a compression spring (220) is sleeved between the convex ring (212) and the circular baffle (221) of the rotating shaft (22).

4. A rotary positioning cutting device for measuring safety indicators in cigarette paper according to claim 3, characterized in that: An annular groove is formed on the upper end surface of the convex ring (212), a thrust cylindrical roller bearing (23) is installed in the annular groove, and the lower end surface of the compression spring (220) rests against the thrust cylindrical roller bearing (23).

5. A rotary positioning cutting device for measuring safety indicators in cigarette paper according to claim 3, characterized in that: A ball bearing is provided on the lower end surface of the arc-shaped positioning boss (211).

6. A rotary positioning cutting device for measuring safety indicators in cigarette paper according to claim 3, characterized in that: A handle (24) is fixedly provided on the sleeve (21).

7. A rotary positioning cutting device for measuring safety indicators in cigarette paper according to claim 1, characterized in that: A rectangular fixing column (222) is integrally formed at the lower end of the rotating shaft (22), a threaded column (223) is integrally formed at the lower end of the rectangular fixing column (222), a rectangular through hole (2220) matching the rectangular fixing column (222) is provided on the base (1), a blind hole (2230) is further provided on the lower end surface of the base (1) at a position corresponding to the rectangular through hole, a fixing nut (2231) is screwed onto the threaded column (223), and the fixing nut (2231) is located in the blind hole (2230).

8. A rotary positioning cutting device for measuring safety indicators in cigarette paper according to claim 1, characterized in that: A first hinge seat (40) is fixedly provided on the base (1), a connecting rod (4) is hingedly provided on the first hinge seat (40), a free end of the connecting rod (4) is hingedly provided to a pressing block (41), and an arc block (42) is also fixedly provided on the free end of the connecting rod (4).

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