Label folding device and labeling machine for labeling cylindrical workpieces

Abstract

The present invention relates to the technical field of labeling equipment, and in particular to a label folding device and a labeling machine for labeling columnar workpieces, 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 a first side of the annular portion, and a second label paper arranged on a second side of the annular portion. The label folding device includes a conveying component and a folding component for folding the U-shaped label paper to make it fit the columnar workpiece; the conveying component includes a conveyor belt and a accommodating part arranged on the conveyor belt 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; the present invention can fold the label paper wrapped around the columnar workpiece to make it completely fit.

Description

Technical Field

[0001] The present 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, labeling is required to attach labels to individual cigars to indicate their brand, model, country of origin, and other information. Traditionally, this process has been performed manually, which is time-consuming and inefficient.

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

[0004] As mentioned above, the current labeling method for cylindrical workpieces is mostly to wrap the label paper around the cylindrical workpiece using a roller, which is called rotary labeling. This type of rotary labeling machine has the following problems: for label paper with a certain degree of hardness, such as cigar labels, the label paper may not adhere securely during the rotary labeling process. After the label paper is combined with the cylindrical workpiece, a folding process is required to ensure the label paper is fully adhered. 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 cylindrical workpiece, which can fold the label paper wrapped around the cylindrical 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 cylindrical workpieces, wherein the outside of the cylindrical workpiece is wrapped with a U-shaped label paper to be folded, and the U-shaped label paper includes an annular portion arranged at the bottom of the cylindrical 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, and is characterized in that the label folding device includes a conveying component for conveying the cylindrical workpiece to enter and leave the label folding station and a folding component for folding the U-shaped label paper to fit the cylindrical workpiece; the conveying component includes a conveyor belt and a accommodating member arranged on the conveyor belt, the accommodating member is provided with a groove for accommodating the cylindrical 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 cylindrical 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 cylindrical 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 cylindrical workpieces provided by the present invention may also have the following characteristics: the second fixing part 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 part, the second section of the second fixing head is connected to the movable part through the second tension spring, and the second fixing head is farther away from the center of the cylindrical 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 member, the second folding member, the first fixing member, and the second fixing member 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 second aspect of the present invention, the technical solution to the problem is to provide a labeling machine including the label folding device for labeling a cylindrical workpiece as described above.

[0017] The beneficial effects of the present invention are:

[0018] 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 labels can be attached more tightly to the columnar workpiece.

[0019] 2. In this application, with reference to the high-precision folding method in which multiple fingers work together during manual folding, a collaborative operation method is designed in which the first folding part and the first fixing part work together to fold the first label paper, and the second folding part and the second fixing part 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 cylindrical workpiece, and improves the process quality of the final product.

[0020] 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 so that the first folding member or the second folding member can move from beginning to end in accordance with the curvature of the cylindrical surface of the columnar workpiece, thereby further improving the folding accuracy.

[0021] 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

[0022] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In the drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, but not all. It is clear that those skilled in the art can derive other drawings from these drawings without inventive effort.

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the accommodation component of the present invention;

[0025] Figure 3 It is a front view of the first folding structure of the present invention;

[0026] Figure 4 is a partial schematic diagram of the first folding structure of the present invention;

[0027] Figure 5 A top view of the first folding structure of the present invention;

[0028] Figure 6 is a side view of a second folding structure of the present invention;

[0029] Figure 7 is a cross-sectional view of a second folding structure of the present invention;

[0030] Figure 8 It is a front view of the second folding structure of the present invention.

[0031] In the picture:

[0032] 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

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying 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 making creative efforts shall fall within the scope of protection of the present invention.

[0034] The present invention provides a label folding device for labeling a columnar workpiece 1, the specific structure of which is as follows:

[0035] like Figure 1 and Figure 2 As shown, before the label folding device performs a label folding operation on the cylindrical workpiece 1, a U-shaped label paper to be folded is wrapped around the outside of the cylindrical workpiece 1. The U-shaped label paper includes an annular portion arranged at the bottom of the cylindrical 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.

[0036] like Figure 1 As shown, the label folding device includes a conveying assembly for conveying a cylindrical workpiece 1 and allowing it to enter and exit a label folding station, and a folding assembly for folding U-shaped label sheets to fit the cylindrical workpiece 1. The conveying assembly includes a conveyor belt (not shown) and a receiving member 3 disposed on the conveyor belt. The receiving member 3 is provided with a groove for accommodating the cylindrical workpiece 1. A first label sheet 21 and a second label sheet 22 are sequentially arranged along the conveying direction 7 of the conveyor belt. The folding assembly includes a first folding structure 4, located upstream of the label folding station, for folding the first label sheet 21, and a second folding structure 5, located downstream of the label folding station, for folding the second label sheet 22. The first folding structure 4 and the second folding structure 5, respectively, fold the first label sheet 21 and the second label sheet 22 in sequence, thereby ensuring a tighter attachment of the label to the cylindrical workpiece 1.

[0037] The inventors further discovered that during the folding process of a label wrapped around the outside of a cylindrical workpiece 1, the label tends to tilt in a certain direction of the cylindrical workpiece 1, resulting in low folding accuracy and large deviations in the applied label, thus producing substandard products and significantly affecting product quality. Manual labeling, while slow, offers high labeling stability. Drawing on the collaborative action of multiple fingers during manual labeling, the inventors further proposed a finger-like design that simultaneously folds the label and secures it to prevent it from tilting, building on the above design.

[0038] like Figure 1-Figure 5 As shown, the first folding structure 4 includes a first folding member 41 for folding the first label paper 21 and a first fixing member 42 for fixing the first label paper 21 when the first folding member 41 performs a folding operation, and the second folding structure 5 includes a second folding member 51 for folding the second label paper 22 and a second fixing member 52 for fixing the second label paper 22 when the second folding member 51 performs a folding operation.

[0039] like Figure 1 and Figure 3 As shown, the first folding structure 4 further 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 cause the first folding member 41 to leave the label folding station when no label folding operation is being performed, thereby preventing the presence of the first folding member 41 from affecting the entry of the accommodating member 3 into the label folding station.

[0040] 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 to the 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 to the 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 of the first label paper 21, thereby improving the folding accuracy of the first label paper 21.

[0041] 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, and 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, and 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 Figure 1 The first tension spring 422 is stretched downward (in the direction shown in FIG. Figure 5 The first fixing head 421 applies a first elastic force, and the first fixing head 421 overcomes the first elastic force and applies a leftward force to the first label paper 21 (as shown in the direction ... Figure 1 As an example, the first label paper 21 is fixed.

[0042] like Figure 1 and Figure 6 As shown, the second folding structure 5 further includes a slide rail 54 and a moving member 53 provided 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 as the conveying direction 7 and returns to the starting position.

[0043] 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 a 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 the folding of the second label paper 22, thereby improving the folding accuracy of the second label paper 22.

[0044] like Figure 1 and Figure 8 As shown, the second fixing member 52 includes a second fixed 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 fixed head 521 is movably connected to the moving member 53 through the fourth movable portion 523, and the second section of the second fixed head 521 is connected to the moving member 53 through the second tension spring 522. The second fixed 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 fixed 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, and at the same time, the second fixed head 521 abuts against the second label paper 22 to fix the label. When the moving member 53 moves to the right, the second fixed head 521 is on the left side of the columnar workpiece 1 (with Figure 1 The second tension spring 522 is stretched to the right (in the direction shown as an example) and contacts the folded second label paper 22. 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 to the second label paper 22 (as shown in the direction shown in the figure). Figure 1 As an example, the second label paper 22 is fixed.

[0045] 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 cylindrical contact heads 6. 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.

[0046] In some specific embodiments, the specific process of labeling the columnar workpiece 1 by the label folding device is as follows:

[0047] like Figure 1 As shown, first, the container 3 contains the cylindrical workpiece 1 and the U-shaped label paper wrapped around the outside of the cylindrical workpiece 1, and the container 3 is transported to the label folding station along 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 cylindrical 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 its initial position. Next, the moving member 53 moves to the right, driving the second folding head 511 to move rightward to push the second label paper 22 to be folded. At the same time, the second fixed head 521 abuts against the second label paper 22 on the left side of the cylindrical 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 its initial position. Finally, the accommodating member 3 leaves the label folding station along with the conveyor belt and enters the next step.

[0048] The present invention further provides a labeling machine comprising the label folding device for labeling a columnar workpiece 1 as described above.

[0049] The contents described above can be implemented individually or in combination in various ways, and these variations are all within the protection scope of the present invention.

[0050] In the description of the invention, it should be noted that relational terms such as first and second, etc. are used only 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 "comprises", "comprising" 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, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0051] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "front," "back," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, unless otherwise specified, "several" means two or more.

[0052] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific embodiments of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection 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 provided at the bottom of the columnar workpiece (1), a first label paper (21) provided at a first side of the annular portion, and a second label paper (22) provided 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 the 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) provided on the conveyor belt, the receiving member (3) being provided with a groove for receiving the columnar workpiece (1), 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 conveyor belt provided upstream of the label folding station and used to fold the first label paper A first folding structure (4) for folding the first label paper (21), and a second folding structure (5) for folding the second label paper (22) provided downstream of the label folding station; the first folding structure (4) includes a first folding member (41) for folding the first label paper (21) and a first fixing member (42) for fixing the first label paper (21) when the first folding member (41) performs a folding operation, and the second folding structure (5) includes a second folding member (51) for folding the second label paper (22) and a first fixing member (42) for fixing the first label paper (21) when the second folding member (51) performs a folding operation. 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); 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, the first section of the first folding head (411) is movably connected to the folding arm (43), and the first section of the first folding head (411) is movably connected to the folding arm (43). The second section is connected to the folding arm (43) through the first compression spring (412); the first fixing member (42) includes a first fixing head (421) 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), the second section of the first fixing head (421) is connected to the folding arm (43) through the first tension spring (422), and the first fixing head (421) is farther away from the center of the columnar workpiece (1) relative to the first folding head (411).

2. The label folding device for labeling a cylindrical workpiece (1) according to claim 1, 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), wherein 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).

3. The label folding device for labeling a cylindrical workpiece (1) according to claim 2, characterized in that: The second folding member (51) includes 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 moving member (53), and a second section of the second folding head (511) is connected to the moving member (53) via the second compression spring (512).

4. The label folding device for labeling a cylindrical workpiece (1) according to claim 3, characterized in that: The second fixing member (52) includes a second fixing head (521) 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), the 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) relative to the second folding head (511).

5. The label folding device for labeling a cylindrical workpiece (1) according to claim 1, characterized in that: The ends of the first folding member (41), the second folding member (51), the first fixing member (42), and the second fixing member (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).

6. 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 5.

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