Label folding device for labeling columnar workpieces and labeling machine

Abstract

The invention relates to the technical field of labeling equipment, in particular to a label folding device for labeling a columnar workpiece and a labeling machine, U-shaped label paper to be folded is wound on the outer portion of the columnar workpiece, and the U-shaped label paper comprises an annular part arranged at the bottom of the columnar workpiece; the first label paper is arranged on the first side of the annular part, the second label paper is arranged on the second side of the annular part, and the label folding device comprises a conveying assembly and a folding assembly used for folding the U-shaped label paper so that the U-shaped label paper can be attached to the columnar workpiece; the conveying assembly comprises a conveying belt and a containing piece arranged on the conveying belt and used for containing the columnar workpieces, and the first label paper and the second label paper are sequentially arranged in the conveying direction of the conveying belt. The folding assembly comprises a first folding structure which is arranged at the upstream of the label folding station and is used for folding first label paper, and a second folding structure which is arranged at the downstream of the label folding station and is used for folding second label paper; label paper wound on a columnar workpiece can be folded, so that the label paper is completely attached to the columnar workpiece.

Description

Technical Field

[0001] The invention relates to the technical field of labeling equipment, in particular to a label folding device and a labeling machine for labeling columnar workpieces. Background Art

[0002] In the tobacco industry, a label is required to be attached to a single cigar to indicate its brand, model, country of origin, etc. In the past, labeling was done manually, which was time-consuming and inefficient.

[0003] In order to improve the labeling efficiency, many devices for labeling columnar workpieces such as cigars have been disclosed. For example, the invention patent with the publication number CN116176987A discloses a real-time printing and labeling device for columnar materials, including a labeling device, the labeling device includes a rubbing wheel, a first ejector pin and a second ejector pin, the rubbing wheel abuts against the columnar material, and during labeling, the first ejector pin and the second ejector pin limit the columnar material, and the rotation of the rubbing wheel drives the columnar material to rotate, thereby completing the labeling. For another example, the invention patent with the publication number CN112278494A discloses a columnar workpiece labeling machine, including a sticker assembly, the sticker assembly includes a suction roller and a blanking roller, the suction roller is used to absorb and transmit the label paper, and the blanking roller is used to convey the columnar workpiece. During labeling, as the blanking roller rotates, the columnar workpiece is conveyed to the suction roller, and the label paper absorbed on the suction roller is entangled with the columnar workpiece, thereby completing the labeling.

[0004] As mentioned above, for labeling cylindrical workpieces, the existing labeling methods are mostly to wrap the label paper around the cylindrical workpiece through a rubbing wheel for labeling, that is, rotary labeling. This labeling machine that uses rotary labeling to label cylindrical workpieces has the following problems: for label paper with a certain hardness, such as the cigar label, the label paper may not adhere firmly during the rotary labeling process. After the label paper is combined with the cylindrical workpiece, a folding process is required to ensure that the label paper is completely attached. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the first aspect of the present invention aims to provide a label folding device for labeling a columnar workpiece, which can fold the label paper wrapped around the columnar workpiece to make it completely fit.

[0006] A second aspect of the present invention aims to provide a labelling machine.

[0007] According to the purpose of the first aspect of the present invention, the technical solution to the problem of the present invention is to provide a label folding device for labeling a columnar workpiece, wherein a U-shaped label paper to be folded is wrapped around the outside of the columnar workpiece, and the U-shaped label paper includes an annular portion arranged at the bottom of the columnar workpiece, a first label paper arranged on the first side of the annular portion, and a second label paper arranged on the second side of the annular portion, characterized in that the label folding device includes a conveying component for conveying the columnar workpiece to enter and leave a label folding station and a folding component for folding the U-shaped label paper to fit the columnar workpiece; the conveying component includes a conveyor belt and a receiving member arranged on the conveyor belt, the receiving member is provided with a groove for accommodating the columnar workpiece, and the first label paper and the second label paper are arranged in sequence along the conveying direction of the conveyor belt; the folding component includes a first folding structure arranged upstream of the label folding station for folding the first label paper, and a second folding structure arranged downstream of the label folding station for folding the second label paper.

[0008] Furthermore, the label folding device for labeling cylindrical workpieces provided by the present invention may also have the following characteristics: the first folding structure includes a first folding piece for folding the first label paper and a first fixing piece for fixing the first label paper when the first folding piece performs a folding operation, and the second folding structure includes a second folding piece for folding the second label paper and a second fixing piece for fixing the second label paper when the second folding piece performs a folding operation.

[0009] Furthermore, the label folding device for labeling cylindrical workpieces provided by the present invention may also have the following characteristics: the first folding structure also includes a folding arm and a rotation center, one end of the folding arm is rotatably connected to the rotation center, and the other end is connected to the first folding member.

[0010] Furthermore, the label folding device for labeling cylindrical workpieces provided by the present invention may also have the following characteristics: the first folding member includes a first folding head and a first compression spring for pushing the first label paper for folding operation, the first section of the first folding head is movably connected to the folding arm, and the second section of the first folding head is connected to the folding arm through the first compression spring.

[0011] Furthermore, the label folding device for labeling columnar workpieces provided by the present invention may also have the following characteristics: the first fixing member includes a first fixing head and a first tension spring for abutting against the first label paper for fixing operation, the first section of the first fixing head is movably connected to the folding arm, the second section of the first fixing head is connected to the folding arm through the first tension spring, and the first fixing head is farther away from the center of the columnar workpiece than the first folding head.

[0012] Furthermore, the label folding device for labeling cylindrical workpieces provided by the present invention may also have the following characteristics: the second folding structure also includes a slide rail and a movable part arranged on the slide rail, the guiding direction of the slide rail is parallel to the conveying direction of the conveyor belt, and the movable part is connected to the second folding part.

[0013] Furthermore, the label folding device for labeling cylindrical workpieces provided by the present invention may also have the following characteristics: the second folding member includes a second folding head and a second compression spring for pushing the second label paper for folding operation, the first section of the second folding head is movably connected to the movable member, and the second section of the second folding head is connected to the movable member through the second compression spring.

[0014] Furthermore, the label folding device for labeling columnar workpieces provided by the present invention may also have the following characteristics: the second fixing member includes a second fixing head and a second tension spring for abutting against the second label paper for fixing operation, the first section of the second fixing head is movably connected to the movable member, the second section of the second fixing head is connected to the movable member through the second tension spring, and the second fixing head is farther away from the center of the columnar workpiece than the second folding head.

[0015] Furthermore, the label folding device for labeling cylindrical workpieces provided by the present invention may also have the following characteristics: the ends of the first folding piece, the second folding piece, the first fixing piece, and the second fixing piece are all provided with cylindrical contact heads, and the cylindrical surface of the contact head abuts against the first label paper or the second label paper.

[0016] According to the purpose of the second aspect of the present invention, the technical solution of the present invention is to provide a labeling machine, including the label folding device for labeling a columnar workpiece as described above.

[0017] The beneficial effects of the present invention are: 1. In the present application, the first label paper and the second label paper are folded in sequence by the first folding structure and the second folding structure respectively, so that the label can be attached more tightly to the columnar workpiece.

[0018] 2. In the present application, reference is made to the high-precision folding method in which multiple fingers work together during manual folding, and a collaborative operation method is designed in which the first folding member and the first fixing member work together to fold the first label paper, and the second folding member and the second fixing member work together to fold the second label paper. This greatly improves the accuracy of the folding operation, ensures the complete fit between the label paper and the columnar workpiece, and improves the process quality of the final product.

[0019] 3. In the present application, by setting the first compression spring and the second compression spring, the restoring force can be stored by compression in the first half of the movement of the first folding member or the second folding member, and the restoring force can be released in the second half to enable the first folding member or the second folding member to move in accordance with the curvature of the cylindrical surface of the columnar workpiece from beginning to end, thereby further improving the folding accuracy.

[0020] 4. In the present application, since the movement of the folding arm or the movable part will stretch the first tension spring or the second tension spring and apply an elastic force to the first fixed part or the second fixed part, the first fixed part or the second fixed part can apply force to the first label paper or the second label paper by overcoming the elastic force, thereby achieving the effect of fixing the first label paper or the second label paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated into the specification and constitute a part of the specification, illustrate embodiments of the present invention and are used together with the description to explain the principles of the present invention. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. For those of ordinary skill in the art, other drawings can be obtained from these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the accommodation component of the present invention; Figure 3 It is a front view of the first folding structure of the present invention; Figure 4 It is a partial schematic diagram of the first folding structure of the present invention; Figure 5 A top view of a first folding structure of the present invention; Figure 6 is a side view of a second folding structure of the present invention; Figure 7 is a cross-sectional view of a second folding structure of the present invention; Figure 8 It is a front view of the second folding structure of the present invention.

[0023] In the figure: 1. Columnar workpiece; 21. First label paper; 22. Second label paper; 3. Accommodating member; 4. First folding structure; 41. First folding member; 411. First folding head; 412. First compression spring; 413. First movable part; 42. First fixing member; 421. First fixing head; 422. First tension spring; 423. Second movable part; 43. Folding arm; 44. Rotation center; 5. Second folding structure; 51. Second folding member; 511. Second folding head; 512. Second compression spring; 513. Third movable part; 52. Second fixing member; 521. Second fixing head; 522. Second tension spring; 523. Fourth movable part; 53. Moving member; 54. Slide rail; 6. Contact head; 7. Conveying direction. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The present invention provides a label folding device for labeling a columnar workpiece 1, and the specific structure is as follows: like Figure 1 and Figure 2 As shown, before the label folding device performs a label folding operation on the columnar workpiece 1, a U-shaped label paper to be folded is wrapped around the outside of the columnar workpiece 1, and the U-shaped label paper includes an annular portion arranged at the bottom of the columnar workpiece 1, a first label paper 21 arranged on the first side of the annular portion, and a second label paper 22 arranged on the second side of the annular portion.

[0026] like Figure 1 As shown, the label folding device includes a conveying assembly for conveying a columnar workpiece 1 to enter and leave a label folding station and a folding assembly for folding a U-shaped label paper to fit the columnar workpiece 1. The conveying assembly includes a conveyor belt (not shown in the figure) and a receiving member 3 arranged on the conveyor belt, and a groove for receiving the columnar workpiece 1 is arranged on the receiving member 3. The first label paper 21 and the second label paper 22 are arranged in sequence along the conveying direction 7 of the conveyor belt; the folding assembly includes a first folding structure 4 arranged upstream of the label folding station for folding the first label paper 21, and a second folding structure 5 arranged downstream of the label folding station for folding the second label paper 22. The first label paper 21 and the second label paper 22 are folded in sequence by the first folding structure 4 and the second folding structure 5, respectively, so that the label can be more closely attached to the columnar workpiece 1.

[0027] The inventors further discovered that in the process of folding the label wrapped around the outside of the columnar workpiece 1, the label is prone to tilt in a certain direction of the columnar workpiece 1, resulting in low label folding accuracy and excessive deviation of the label, thereby producing unqualified products, greatly affecting the product production quality. Although manual labeling is slow, it has higher labeling stability. Referring to the method of labeling by multiple fingers working together during manual labeling, the inventors further proposed a finger-like design that fixes the label to prevent it from tilting while folding the label.

[0028] like Figure 1-Figure 5 As shown, the first folding structure 4 includes a first folding piece 41 for folding the first label paper 21 and a first fixing piece 42 for fixing the first label paper 21 when the first folding piece 41 performs a folding operation, and the second folding structure 5 includes a second folding piece 51 for folding the second label paper 22 and a second fixing piece 52 for fixing the second label paper 22 when the second folding piece 51 performs a folding operation.

[0029] like Figure 1 and Figure 3 As shown, the first folding structure 4 also includes a folding arm 43 and a rotation center 44. One end of the folding arm 43 is rotatably connected to the rotation center 44, and the other end is connected to the first folding member 41. Figure 1 Taking the direction shown as an example, the folding arm 43 rotates counterclockwise around the rotation center 44, driving the first folding member 41 to move leftward, and the first folding member 41 pushes the first label paper 21 to fold. In the above embodiment, the folding arm 43 can rotate in the opposite direction to make the first folding member 41 leave the label folding station when the label folding operation is not performed, so as to avoid the existence of the first folding member 41 affecting the accommodating member 3 from entering the label folding station.

[0030] like Figure 1 and Figure 4 As shown, the first folding member 41 includes a first folding head 411, a first movable portion 413 and a first compression spring 412 for pushing the first label paper 21 to perform a folding operation. The first section of the first folding head 411 is movably connected to the folding arm 43 through the first movable portion 413, and the second section of the first folding head 411 is connected to the folding arm 43 through the first compression spring 412. Figure 4Taking the direction shown as an example, the folding arm 43 rotates counterclockwise to drive the first folding head 411 to move left, pushing the first label paper 21 to fold. Since the first folding head 411 and the folding arm 43 are movably connected, the first folding head 411 can fit the cylindrical surface of the cylindrical workpiece 1 and move to the left along the curvature of the cylindrical surface until it reaches the highest point of the cylindrical workpiece 1. During this process, the first compression spring 412 is compressed and stores the first restoring force; when the first folding head 411 passes the highest point of the cylindrical surface of the cylindrical workpiece 1, the folding arm 43 continues to rotate counterclockwise, driving the first folding head 411 to continue to move left. The first compression spring 412 releases the first restoring force and gives the first folding head 411 a downward force, so that it can always maintain contact with the cylindrical surface during the folding process of the first label paper 21, thereby improving the folding accuracy of the first label paper 21.

[0031] like Figure 1 and Figure 5 As shown, the first fixing member 42 includes a first fixing head 421, a second movable portion 423 and a first tension spring 422 for abutting against the first label paper 21 for fixing operation. The first section of the first fixing head 421 is movably connected to the folding arm 43 through the second movable portion 423. The second section of the first fixing head 421 is connected to the folding arm 43 through the first tension spring 422. The first fixing head 421 is farther away from the center of the columnar workpiece 1 relative to the first folding head 411, so as to avoid the first fixing head 421 blocking the movement of the first folding head 411 when folding when fixing the label. In the process of folding the first label paper 21, the first folding member 41 pushes the first label paper 21 to fold it. At the same time, the first fixing head 421 abuts against the first label paper 21 to fix the label. When the folding arm 43 rotates, the first fixing head 421 is on the right side of the columnar workpiece 1 (with the first folding head 411 at the right side). Figure 1 The first tension spring 422 is stretched downward (in the direction shown in FIG. 1 ) and abuts against the folded first label paper 21. Figure 5 The first fixing head 421 applies a first elastic force to the first fixing head 421, and the first fixing head 421 overcomes the first elastic force and applies a leftward force to the first label paper 21 (with Figure 1 The direction shown in the figure is taken as an example), thereby achieving the effect of fixing the first label paper 21.

[0032] like Figure 1 and Figure 6 As shown, the second folding structure 5 further includes a slide rail 54 and a moving member 53 disposed on the slide rail 54. The guide direction of the slide rail 54 is parallel to the conveying direction 7 of the conveyor belt. The moving member 53 is connected to the second folding member 51. Figure 1Taking the direction shown as an example, the moving member 53 moves to the right in the opposite direction of the conveying direction 7, driving the second folding member 51 to move to the right, and the second folding member 51 pushes the second label paper 22 to fold. When the accommodating member 3 leaves the label folding station, the moving member 53 moves to the left in the same direction of the conveying direction 7 and returns to the starting position.

[0033] like Figure 1 and Figure 7 As shown, the second folding member 51 includes a second folding head 511, a third movable portion 513, and a second compression spring 512 for pushing the second label paper 22 to perform a folding operation. The first section of the second folding head 511 is movably connected to the movable member 53 through the third movable portion 513, and the second section of the second folding head 511 is connected to the movable member 53 through the second compression spring 512. Figure 7 Taking the direction shown as an example, the movable part 53 moves to the right, driving the second folding head 511 to move to the right, pushing the second label paper 22 to fold. Since the second folding head 511 and the movable part 53 are movably connected, the second folding head 511 can fit the cylindrical surface of the cylindrical workpiece 1 and move to the right along the curvature of the cylindrical surface until it reaches the highest point of the cylindrical workpiece 1. The second compression spring 512 is compressed and stores the second restoring force; when the second folding head 511 passes the highest point of the cylindrical surface of the cylindrical workpiece 1, the movable part 53 continues to move to the right, driving the second folding head 511 to continue to move to the right. The second compression spring 512 releases the second restoring force and gives the second folding head 511 a downward force, so that it can maintain contact with the cylindrical surface during folding the second label paper 22, thereby improving the folding accuracy of the second label paper 22.

[0034] like Figure 1 and Figure 8 As shown, the second fixing member 52 includes a second fixing head 521, a fourth movable portion 523 and a second tension spring 522 for abutting against the second label paper 22 for fixing operation. The first section of the second fixing head 521 is movably connected to the moving member 53 via the fourth movable portion 523. The second section of the second fixing head 521 is connected to the moving member 53 via the second tension spring 522. The second fixing head 521 is farther away from the center of the columnar workpiece 1 relative to the second folding head 511, so as to avoid the second fixing head 521 blocking the movement of the second folding head 511 when folding when fixing the label. In the process of folding the second label paper 22, the second folding member 51 pushes the second label paper 22 to fold it. At the same time, the second fixing head 521 abuts against the second label paper 22 to fix the label. When the moving member 53 moves to the right, the second fixing head 521 is on the left side of the columnar workpiece 1 (with the second fixing head 521 at the left side). Figure 1 The second tension spring 522 is stretched to the right (in the direction shown in FIG. Figure 8The second fixing head 521 applies a second elastic force, and the second fixing head 521 overcomes the second elastic force and applies a rightward force (with Figure 1 The direction shown in the figure is taken as an example), thereby achieving the effect of fixing the second label paper 22.

[0035] In order to prevent the folding or fixing operations from damaging the label paper, it is preferred that the ends of the first folding head 411, the second folding head 511, the first fixed head 421, and the second fixed head 521 are all provided with a cylindrical contact head 6, and the cylindrical surface of the contact head 6 abuts against the first label paper 21 or the second label paper 22, which can better protect the integrity of the label paper.

[0036] In some specific embodiments, the specific process of labeling the columnar workpiece 1 by the label folding device is as follows: like Figure 1 As shown, first, the container 3 contains the columnar workpiece 1 and the U-shaped label paper wrapped around the outside of the columnar workpiece 1, and the container 3 is transported into the label folding station along with the conveyor belt. Secondly, the folding arm 43 rotates counterclockwise around the rotation center 44, driving the first folding head 411 to move leftward to push the first label paper 21 to fold. At the same time, the first fixed head 421 abuts against the first label paper 21 on the right side of the columnar workpiece 1 to prevent the first label paper 21 from being skewed during folding. When the first label paper 21 is folded, the folding arm 43 rotates clockwise around the rotation center 44 to return the first folding structure 4 to the initial position. Next, the moving member 53 moves to the right, driving the second folding head 511 to move to the right to push the second label paper 22 to fold. At the same time, the second fixed head 521 abuts against the second label paper 22 on the left side of the columnar workpiece 1 to prevent the second label paper 22 from being skewed during folding. When the second label paper 22 is folded, the moving member 53 moves to the left to return the second folding structure 5 to the initial position. Finally, the receiving member 3 leaves the label folding station along with the conveyor belt and enters the next step.

[0037] The present invention further provides a labeling machine, comprising the label folding device for labeling a columnar workpiece 1 as described above.

[0038] The contents described above may be implemented individually or in combination in various ways, and these variations are all within the protection scope of the present invention.

[0039] In the description of the invention, it should be noted that relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements.

[0040] In the description of the invention, it is also necessary to explain that the terms "center", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the invention. In the description of the invention, unless otherwise specified, "several" means two or more.

[0041] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementation modes, and it cannot be determined that the specific embodiments of the present invention are limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A label folding device for labeling a columnar workpiece (1), wherein a U-shaped label paper to be folded is wrapped around the outside of the columnar workpiece (1), the U-shaped label paper comprising an annular portion arranged at the bottom of the columnar workpiece (1), a first label paper (21) arranged at a first side of the annular portion, and a second label paper (22) arranged at a second side of the annular portion, characterized in that: The label folding device comprises a conveying assembly for conveying the columnar workpiece (1) and making it enter and leave a label folding station, and a folding assembly for folding the U-shaped label paper and making it fit the columnar workpiece (1); the conveying assembly comprises a conveyor belt and a receiving member (3) arranged on the conveyor belt, the receiving member (3) being provided with a groove for receiving the columnar workpiece (1), and the first label paper (21) and the second label paper (22) being arranged in sequence along the conveying direction (7) of the conveyor belt; the folding assembly comprises a first folding structure (4) arranged upstream of the label folding station and used for folding the first label paper (21), and a second folding structure (5) arranged downstream of the label folding station and used for folding the second label paper (22).

2. The label folding device for labeling a columnar workpiece (1) according to claim 1, characterized in that: The first folding structure (4) comprises a first folding piece (41) for folding the first label paper (21) and a first fixing piece (42) for fixing the first label paper (21) when the first folding piece (41) is performing a folding operation, and the second folding structure (5) comprises a second folding piece (51) for folding the second label paper (22) and a second fixing piece (52) for fixing the second label paper (22) when the second folding piece (51) is performing a folding operation.

3. The label folding device for labeling a columnar workpiece (1) according to claim 2, characterized in that: The first folding structure (4) further comprises a folding arm (43) and a rotation center (44); one end of the folding arm (43) is rotatably connected to the rotation center (44), and the other end is connected to the first folding member (41).

4. The label folding device for labeling a columnar workpiece (1) according to claim 3, characterized in that: The first folding member (41) comprises a first folding head (411) and a first compression spring (412) for pushing the first label paper (21) to perform a folding operation, wherein a first section of the first folding head (411) is movably connected to the folding arm (43), and a second section of the first folding head (411) is connected to the folding arm (43) via the first compression spring (412).

5. The label folding device for labeling a columnar workpiece (1) according to claim 4, characterized in that: The first fixing member (42) comprises a first fixing head (421) and a first tension spring (422) for abutting against the first label paper (21) for fixing operation; a first section of the first fixing head (421) is movably connected to the folding arm (43); a second section of the first fixing head (421) is connected to the folding arm (43) via the first tension spring (422); and the first fixing head (421) is further away from the center of the columnar workpiece (1) than the first folding head (411).

6. The label folding device for labeling a columnar workpiece (1) according to claim 2, characterized in that: The second folding structure (5) further comprises a slide rail (54) and a moving member (53) arranged on the slide rail (54); the guiding direction of the slide rail (54) is parallel to the conveying direction (7) of the conveyor belt; and the moving member (53) is connected to the second folding member (51).

7. The label folding device for labeling a columnar workpiece (1) according to claim 6, characterized in that: The second folding member (51) comprises a second folding head (511) and a second compression spring (512) for pushing the second label paper (22) to perform a folding operation; a first section of the second folding head (511) is movably connected to the movable member (53); and a second section of the second folding head (511) is connected to the movable member (53) via the second compression spring (512).

8. The label folding device for labeling a columnar workpiece (1) according to claim 7, characterized in that: The second fixing member (52) comprises a second fixing head (521) and a second tension spring (522) for abutting against the second label paper (22) for fixing operation; a first section of the second fixing head (521) is movably connected to the moving member (53); a second section of the second fixing head (521) is connected to the moving member (53) via the second tension spring (522); and the second fixing head (521) is further away from the center of the columnar workpiece (1) than the second folding head (511).

9. The label folding device for labeling a columnar workpiece (1) according to claim 2, characterized in that: The ends of the first folding piece (41), the second folding piece (51), the first fixing piece (42), and the second fixing piece (52) are all provided with cylindrical contact heads (6), and the cylindrical surface of the contact heads (6) abuts against the first label paper (21) or the second label paper (22).

10. A labeling machine, characterized in that: It comprises a label folding device for labeling a columnar workpiece (1) as described in any one of claims 1 to 9.

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