JP7375577B2 - How to cover the shaft end of a cylindrical body - Google Patents

Description

The present invention relates to a method for covering the shaft end of a cylindrical body, and more particularly to a method for covering the shaft end of a cylindrical body by shrinking the outer circumference of a heat-shrinkable film having a rectangular plane and covering the shaft end of the cylindrical body with the heat-shrinkable film. The present invention relates to a shaft end coating method.

2. Description of the Related Art Conventional oil filters are generally known to include a cylindrical housing attached to the engine side and a filtration element housed within the housing (see, for example, Patent Document 1). A gasket is provided at the shaft end of the housing to seal the housing from the engine side. The oil filter is transported and stored with the shaft end of the housing covered with a heat-shrinkable film to protect the gasket from dust. This heat-shrinkable film can be peeled off from the housing by grasping its outer periphery when replacing the oil filter or the like.

In the above oil filter, for example, as shown in FIG. 10, a heat shrinkable film 110 having a circular planar shape is brought into contact with the shaft end 102a of the housing 102, and a pair of arc-shaped nozzles 107 and 108 heat shrink the film 110. Hot air is applied to the entire outer periphery of the film 110 to uniformly shrink the outer periphery of the heat-shrinkable film 110. As a result, the heat-shrinkable film 110 is attached to the shaft end 102a of the housing 102 and covers the shaft end 102a.

Japanese Patent Application Publication No. 2017-149454

However, in the above-mentioned conventional oil filter, since the outer periphery of the heat-shrinkable film 110 having a circular planar shape is uniformly shrunk, the entire outer periphery of the heat-shrinkable film 110 tends to come into close contact with the side wall of the housing 102, and the heat-shrinkable film It is difficult to form an appropriate gripping shape on the outer periphery of 110. Therefore, it is difficult to peel off the heat-shrinkable film 110 from the housing 102, and there is a possibility that the gasket 103 may be removed at the same time by mistake. Furthermore, since the heat-shrinkable film 110 having a circular planar shape is used, it is necessary to punch out the strip-shaped film material into a round shape, resulting in a poor material yield.
Furthermore, in the above conventional oil filter, since the outer circumference of the heat-shrinkable film 110 having a circular planar shape is uniformly shrunk, a pair of arc-shaped nozzles 107 and 108 are arranged to surround the outer circumference 110 of the heat-shrinkable film. There is a need to. Therefore, it is difficult to apply hot air to the housing 102 during transportation, and the cycle time becomes longer.
The above-mentioned problem also applies to products with cylindrical bodies other than oil filters (for example, air cleaners with ventilation pipes, intake manifolds, etc.) when a heat shrink film is attached to the shaft end of the cylindrical body. arise.

Note that Patent Document 1 discloses a technique of shrinking the outer peripheral portion of a planar rectangular heat-shrinkable film using an electromagnetic induction coil and covering the shaft end of a cylindrical body with the heat-shrinkable film. However, since an electromagnetic induction coil is used, the coating method is complicated.

The present invention has been made in view of the above-mentioned current situation, and an object of the present invention is to provide a method for covering the shaft end of a cylindrical body that can stably form a handle for peeling off a heat-shrinkable film. do.

In order to solve the above problem, the invention as set forth in claim 1 provides a shaft of a cylindrical body in which the outer circumference of a heat-shrinkable film having a rectangular plane is shrunk and the axial end of the cylindrical body is covered with the heat-shrinkable film. An end covering method, wherein the axial end of the cylindrical body and the heat-shrinkable film are in contact with each other, and from a first side of the cylindrical body with respect to the outer circumference of the heat-shrinkable film. A first shrinking step of shrinking the outer periphery of the heat-shrinkable film by applying hot air; a second shrinking step of shrinking the outer circumference of the heat-shrinkable film by applying hot air from a second side opposite to the first side of the cylindrical body, the first shrinking step In the second shrinking step, the outer periphery of the heat-shrinkable film is shrunk and at the same time a handle portion is formed on the outer periphery.
According to a second aspect of the invention, in the first aspect of the invention, the second shrinking step is performed after the first shrinking step.
The invention according to claim 3 is the invention according to claim 1 or 2, in which the first shrinking step applies hot air along the first side of the heat shrinkable film, and the second shrinking step includes: The gist is to apply hot air along a second side of the heat-shrinkable film that is opposite to the first side.
The invention according to claim 4 is the invention according to any one of claims 1 to 3, in which the axial end of the cylindrical body is placed on the heat shrinkable film. The gist is to bring the shaft end of the heat-shrinkable film into contact with the heat-shrinkable film.
The invention according to claim 5 is the invention according to any one of claims 1 to 4, in which each of the first shrinking step and the second shrinking step is performed on an axial end portion of the heat-shrinkable film. The gist is that this is carried out while the cylindrical body is being conveyed in a predetermined conveyance direction in a state in which the cylindrical body is in contact with the body.
The invention according to claim 6 is characterized in that, in the invention according to any one of claims 1 to 5, the cylindrical body is a housing that constitutes an oil filter.

According to the method for covering the shaft end of a cylindrical body of the present invention, with the shaft end of the cylindrical body and the heat-shrinkable film in contact with each other, the first coating of the cylindrical body against the outer circumference of the heat-shrinkable film is A first shrinking process in which the outer periphery of the heat-shrinkable film is shrunk by applying hot air from the side; and a second shrinking step of shrinking the outer circumference of the heat-shrinkable film by applying hot air from a second side opposite to the first side of the cylindrical body. Then, in the first shrinking step and the second shrinking step, the outer peripheral portion of the heat-shrinkable film is shrunk and at the same time a handle portion is formed on the outer peripheral portion. As a result, when the outer periphery of the heat-shrinkable film having a rectangular shape is shrunk to cover the side wall of the cylindrical body in the first and second shrinking steps, the corners of the heat-shrinkable film are not easily affected by the hot air. , the corner portion forms a handle portion. Therefore, a handle portion for peeling off the heat-shrinkable film can be stably formed. Furthermore, since a heat-shrinkable film having a rectangular planar shape is used, the material yield can be increased compared to the case where a heat-shrinkable film having a circular planar shape is used.

In addition, when the second shrinking step is performed after the first shrinking step, it is possible to suppress the hot air in the first and second shrinking steps from influencing each other, and a handle portion is formed on the outer periphery of the heat shrinkable film. It can be formed more stably.

Further, the first shrinking step applies hot air along a first side of the heat shrinkable film, and the second shrinking step applies hot air to a second side of the heat shrinkable film opposite to the first side. When hot air is applied along the heat-shrinkable film, the handle can be formed more stably on the outer periphery of the heat-shrinkable film.

Furthermore, by placing the shaft end of the cylindrical body on the heat shrinkable film, when the shaft end of the cylindrical body and the heat shrinkable film are brought into contact with each other, the two can be easily brought into contact with each other. be able to.

Further, each of the first shrinking step and the second shrinking step is performed while the cylindrical body is being transported in a predetermined transporting direction with the shaft end in contact with the heat-shrinkable film. In this case, the cycle time for covering the shaft end of the cylindrical body with a heat-shrinkable film can be shortened. Furthermore, a small nozzle can be used to blow out hot air.

Furthermore, when the cylindrical body is a housing constituting an oil filter, a handle part for peeling off can be stably formed on the heat-shrinkable film covering the shaft end of the housing.

The invention will be further explained in the following detailed description by way of non-limiting examples of typical embodiments according to the invention and with reference to the mentioned drawings, in which like reference numerals refer to Similar parts are shown through several figures.
1 is an explanatory diagram for explaining a coating device according to Example 1. FIG. 2 is an enlarged cross-sectional view taken along line II-II in FIG. 1. FIG. FIG. 3 is an explanatory diagram for explaining the method for covering the shaft end of the housing according to Example 1, in which (a) shows the state before the heat shrink film is shrunk, and (b) shows the heat shrink film after the heat shrink film is heated in the first shrink step. A shrunk state is shown, and (c) shows a state where the heat-shrinkable film is shrunk by the second shrinking step. FIG. 2 is a side view of an oil filter obtained by the method for covering the shaft end of a housing (a heat-shrinkable film is shown in cross section). FIG. 6 is an explanatory diagram for explaining the method of covering the shaft end of the housing according to Example 2, in which (a) shows the state of the heat-shrinkable film before shrinkage, and (b) shows the heat-shrinkable film after the first shrinkage step. A shrunk state is shown, and (c) shows a state where the heat-shrinkable film is shrunk by the second shrinking step. FIGS. 3A and 3B are explanatory diagrams for explaining a method for covering the shaft end of a housing according to another embodiment, in which (a) and (b) show a mode in which the first and second shrinking steps are performed simultaneously; FIG. 7 is an explanatory diagram for explaining a method for covering the shaft end of a housing according to still another embodiment, in which (a) shows a state before the heat shrinkable film is shrunk, and (b) shows a state after the heat shrinkable film has shrunk. Indicates the condition. FIG. 7 is an explanatory diagram for explaining a method for covering the shaft end of a housing according to still another embodiment, in which (a) shows a state before the heat shrinkable film is shrunk, and (b) shows a state after the heat shrinkable film has shrunk. Indicates the condition. It is an explanatory view for explaining a shaft end covering method of a housing concerning still another form. It is explanatory drawing for demonstrating the shrinkage form of the conventional heat shrinkable film, (a) shows the side view of an oil filter, (b) shows the b arrow direction view.

The matter presented herein is exemplary and is intended to be an illustrative description of embodiments of the invention, and is intended to be a description that will most effectively and easily understand the principles and conceptual features of the invention. This is stated for the purpose of providing an idea. In this regard, it is not intended to present more structural details of the invention than are necessary for a fundamental understanding of the invention, and the description together with the drawings illustrates some aspects of the invention. It will be clear to those skilled in the art how to implement it in practice.

The method for covering the shaft end of a cylindrical body according to the present embodiment includes, for example, as shown in FIGS. 10) A method for covering a shaft end (2a) of a cylindrical body (2) with a heat-shrinkable film ( 10) is in contact with the outer circumference of the heat-shrinkable film (10), the outer circumference of the heat-shrinkable film (10) is shrunk by applying hot air from the first side of the cylindrical body (2). In the first shrinking step, the cylindrical body is compressed against the outer periphery of the heat-shrinkable film (10) with the shaft end (2a) of the cylindrical body (2) and the heat-shrinkable film (10) in contact with each other. (2) A second shrinking step of shrinking the outer peripheral portion of the heat-shrinkable film (10) by applying hot air from a second side opposite to the first side. Then, for example, as shown in FIG. 4 and the like, the outer circumferential portion of the heat-shrinkable film (10) is shrunk by a first shrinking step and a second shrinking step, and at the same time, a handle portion (17) is formed on the outer circumferential portion.

The heat-shrinkable film (10) is square in plan (including squares in addition to rectangles) and has a size that covers the shaft end (2a) of the cylindrical body (2). There are no particular questions. This heat-shrinkable film (10) shrinks when hot air of a predetermined temperature or higher is applied to it.

The purpose, shape, size, etc. of the cylindrical body (2) are not particularly limited. This cylindrical body (2) can be formed into a cylindrical shape, for example. Examples of the cylindrical body (2) include a housing that constitutes an oil filter, a ventilation pipe such as an air cleaner or an intake manifold, and a container that accommodates articles.

The shape, size, number, etc. of the handle portion (17) are not particularly limited as long as it can be grasped by a person. This handle portion (17) is usually not in close contact with the side wall of the cylindrical body (2), and is formed by a non-shrinkable portion or a low-shrinkable portion of the outer periphery of the heat-shrinkable film (10).

In the first shrinking step and the second shrinking step, the amount and temperature of the hot air applied to the outer circumference of the heat-shrinkable film (10) are not particularly limited. These first and second shrinkage steps may be performed, for example, by an operator operating a nozzle that blows out hot air, but, for example, as shown in FIG. It is preferable that this is done. This is because the handle portion (17) can be formed more stably.

The contraction timings of the first contraction process and the second contraction process are not particularly limited. These first and second shrinkage steps may be performed simultaneously, but for example, as shown in FIG. 3, the second shrinkage step is performed after the first shrinkage step (especially after the first shrinkage step is finished) It is preferable to carry out the This is because the handle portion (17) can be formed more stably.

In the first shrinking step and the second shrinking step, for example, as shown in FIG. The shaft end (2a) of the cylindrical body (2) and the heat-shrinkable film (10) can be brought into contact with each other.
In this case, for example, the heat shrink film (10) is placed on the mounting surface (6a), and the hot air can be blown diagonally downward with respect to the mounting surface (6a). As a result, the outer periphery of the heat-shrinkable film (10) is lifted up from above the mounting surface (6a) by the hot air, so that the influence of the hot air on the corners of the heat-shrinkable film (10) can be suppressed, and the heat-shrinkable film ( 10) The parts other than the corners can be effectively shrunk.

In the method for covering the shaft end of a cylindrical body according to the present embodiment, for example, as shown in FIG. In the second shrinking step, hot air is applied along the second side (12) opposite to the first side (11) of the heat-shrinkable film (10).

In the method for covering the shaft end of a cylindrical body according to the present embodiment, for example, as shown in FIG. Hot air is applied along the third side (13), and in the second shrinking step, hot air is applied along the adjacent second side (12) and fourth side (14) of the heat shrink film (10). One example is the form.

In the method for covering the shaft end of a cylindrical body according to the present embodiment, for example, as shown in FIG. This can be carried out while the cylindrical body (10) with the end portion (2a) in contact is being transported in a predetermined transport direction (D).

For example, as shown in FIGS. 1 and 2, the coating device (5) covers a cylindrical body (2) with its shaft end (2a) in contact with a heat-shrinkable film (10). The conveyor (6) conveys in a predetermined conveyance direction (D), and the first side of the cylindrical body (2) with respect to the outer periphery of the heat shrink film (10) while the cylindrical body (2) is conveyed. a first nozzle (7) arranged to blow hot air from the cylindrical body (2), and a first side of the cylindrical body (2) relative to the outer periphery of the heat shrinkable film (10) while the cylindrical body (2) is being transported. A second nozzle (8) arranged to blow out hot air from a second side opposite to the first side.

The shape, number, location, etc. of the first and second nozzles (7, 8) are not particularly limited. These first and second nozzles (7, 8) may be arranged to match the positions in the conveyance direction (D) of the conveyor (6), but the first and second nozzles (7, 8) , the conveyor (6) is preferably arranged at a predetermined distance (S) apart from each other along the conveyance direction (D). This is because the handle portion (17) can be formed more stably. Although the value of this predetermined interval (S) is not particularly limited, it can be set to a value larger than the length of the heat-shrinkable film (10) in the transport direction (D), for example.

The first and second nozzles (7, 8) blow out hot air obliquely downward with respect to the mounting surface (6a) on which the heat-shrinkable film (10) is mounted, for example, as shown in FIG. It can be set up like this. In this case, the outer periphery of the heat-shrinkable film (10) is lifted from the mounting surface (6a) by the hot air, so that the influence of the hot air on the corners of the heat-shrinkable film (10) can be suppressed, and the heat-shrinkable film ( 10) The parts other than the corners can be effectively shrunk.

Note that the reference numerals in parentheses of each configuration described in the above embodiment indicate a correspondence relationship with a specific configuration described in an example described later.

Hereinafter, the present invention will be specifically explained by examples and the like with reference to the drawings. In the present embodiment, a method for covering the shaft end of a housing constituting an oil filter will be described as a "method for covering the shaft end of a cylindrical body" according to the present invention.

As shown in FIG. 4, the oil filter 1 includes a metal cylindrical housing 2 that is attached to the engine side, and a filter element (not shown) that is housed within the housing 2. A gasket 3 is provided at the shaft end 2a of the housing 2 for sealing between the housing 2 and the engine.

<Example 1>
(1) Structure of coating method As shown in FIGS. 1 and 2, the method for coating the shaft end of the housing according to this embodiment uses a coating device 5 to shrink the outer periphery of a heat-shrinkable film 10 having a rectangular planar shape. This is a covering method in which the shaft end 2a of the housing 2 is covered with the heat-shrinkable film 10. This coating device 5 includes a conveyor 6, a first nozzle 7, and a second nozzle 8.

In this embodiment, a heat-shrinkable film 10 having a square shape with a vertical width and a horizontal width of 100 mm and a thickness of 25 microns is used. Further, a heat-shrinkable film 10 obtained by cutting a strip-shaped film material with a Thomson blade is employed. Furthermore, a housing 2 with a diameter of 68 mm is employed.

The conveyor 6 conveys the housing 2 with the shaft end 2a in contact with the heat-shrinkable film 10 in a predetermined conveyance direction D at a predetermined conveyance speed (for example, 250 mm/sec). Specifically, the heat-shrinkable film 10 is placed on the upper surface 6a of the conveyor 6 so that the first side 11 and the second side 12 facing each other are along the conveyance direction D. Then, the housing 2 is placed on the heat-shrinkable film 10 with its axis perpendicular. By operating the conveyor 6 in this state, the housing 2 is transported in the transport direction D.
Note that the heat-shrinkable film 10 may be placed on the upper surface 6a of the conveyor 6 via a raised material (spacer).

The first nozzle 7 is arranged so as to blow hot air from the first side of the housing 2 toward the outer circumference of the heat-shrinkable film 10 while the housing 2 is being transported. That is, the first nozzle 7 is arranged on the first outer side of the conveyance path of the housing 2 . Furthermore, the first nozzle 7 is arranged so as to blow out hot air diagonally downward with respect to the upper surface 6a of the conveyor 6 (see FIG. 2).

The second nozzle 8 is arranged to blow hot air from a second side opposite to the first side of the housing 2 against the outer circumference of the heat-shrinkable film 10 while the housing 2 is being transported. . That is, the second nozzle 8 is arranged on a second side of the conveyance trajectory of the housing 2 opposite to the first side. Further, the second nozzle is arranged so as to blow hot air diagonally downward with respect to the upper surface of the conveyor (see FIG. 2).

The first and second nozzles 7 and 8 are arranged at a predetermined interval S apart from each other along the conveyance direction D of the conveyor 6. That is, the first nozzle 7 is arranged upstream of the second nozzle 8 in the transport direction D of the conveyor 6 and shifted by a predetermined interval S. This predetermined interval S (for example, 125 mm) is set to be larger than the length of the heat-shrinkable film 10 in the transport direction D (specifically, the length of one side of the heat-shrinkable film 10 (for example, 100 mm)). .
Note that the temperature of the hot air immediately after being blown out from the first and second nozzles 7 and 8 is approximately 180°C.

(2) Method for covering the shaft end of the housing The method for covering the shaft end of the housing according to this embodiment includes a first shrinking step and a second shrinking step.

As shown in FIG. 3, the first shrinking step is performed by applying hot air to the outer circumference of the heat-shrinkable film 10 from the first side of the housing 2 using the first nozzle 7 while the housing 2 is being transported. The outer periphery of the shrink film 10 is partially shrunk. Specifically, in the first shrinking step, hot air is applied by the first nozzle 7 along the first side 11 (that is, the linear edge side) of the heat-shrinkable film 10 .

According to the first shrinking step, the outer peripheral portion of the heat-shrinkable film 10 is lifted upward by the hot air and is shrunk to cover the side wall of the housing 2 . At this time, the corners of the heat-shrinkable film 10 that are lifted upward are not easily affected by the hot air, and the handle portions 17 are formed by the corners (see FIG. 3(b)).

The second shrinking step is performed after the heat-shrinkable film 10 has finished shrinking in the first shrinking step. In this second shrinking step, while the housing 2 is being transported, hot air is applied to the outer circumference of the heat-shrinkable film 10 from a second side of the housing 2 opposite to the first side using a second nozzle 8. The outer periphery of the heat-shrinkable film 10 is partially shrunk. Specifically, in the second shrinking process, hot air is applied by the second nozzle 8 along the second side 12 (that is, the linear edge side) of the heat-shrinkable film 10 .

According to the second shrinking step, the outer peripheral portion of the heat shrinkable film 10 is lifted upward by the hot air and is shrunk to cover the side wall of the housing 2 . At this time, the corners of the heat-shrinkable film 10 that are lifted upward are not easily affected by the hot air, and the handle portions 17 are formed by the corners (see FIG. 3(c)).

By going through the first and second shrinking steps described above, in the oil filter 1, as shown in FIG. (large diameter part) to cover the shaft end 2a. Therefore, the oil filter 1 is transported and stored with the gasket 3 dust-proofed by the heat-shrinkable film 10. Furthermore, since a handle part 17 is formed on the outer periphery of the heat-shrinkable film 10, when an automobile dealer or an end user replaces the oil filter 1, the heat-shrinkable film 10 ( Tight cap) is peeled off from the housing 2 with light force. Therefore, the workability is good and the risk of removing the gasket 3 at the same time is reduced.

(3) Effects of Example According to the housing shaft end coating method of this example, when the shaft end 2a of the housing 2 and the heat shrink film 10 are in contact with each other, the outer circumference of the heat shrink film 10 is a first shrinking step in which the outer circumference of the heat-shrinkable film 10 is shrunk by applying hot air from the first side of the housing 2; A second shrinking step of shrinking the outer circumferential portion of the heat-shrinkable film 10 by applying hot air to the outer circumferential portion of the heat-shrinkable film 10 from a second side opposite to the first side of the housing 2. . Then, in the first shrinking step and the second shrinking step, the outer peripheral portion of the heat-shrinkable film 10 is shrunk, and at the same time, the handle portion 17 is formed on the outer peripheral portion. As a result, when the outer periphery of the heat-shrinkable film 10 having a rectangular planar shape is shrunk to cover the side wall of the housing 2 in the first and second shrinking steps, the corners of the heat-shrinkable film 10 are affected by the hot air. The handle portion 17 is formed by the corner portion. Therefore, the handle portion 17 for peeling off the heat-shrinkable film 10 can be stably formed. Furthermore, since the heat-shrinkable film 10 having a rectangular planar shape is used, the material yield can be increased compared to the case where a heat-shrinkable film having a circular planar shape is used.

Further, in this embodiment, the second shrinking step is performed after the first shrinking step. Thereby, the hot air in the first and second shrinking steps can be suppressed from influencing each other, and the handle portion 17 can be formed more stably on the outer peripheral portion of the heat-shrinkable film 10.
In particular, in this embodiment, the second shrinking step is performed after the first shrinking step is completed. As a result, the hot air from the first and second nozzles 7 and 8 is alternately applied to the outer circumference of the heat-shrinkable film 10, further preventing the hot air from the first and second nozzles 7 and 8 from influencing each other. It can be suppressed.

Further, in this embodiment, the first shrinking step applies hot air along the first side 11 of the heat-shrinkable film 10, and the second shrinking step applies the hot air along the first side 11 of the heat-shrinkable film 10. Apply hot air along side 12 of 2. Thereby, the handle portion 17 can be formed more stably on the outer peripheral portion of the heat-shrinkable film 10. Furthermore, since the heat-shrinkable film 10 is placed on the conveyor 6 so that the first and second sides 11 and 12 are along the conveyance direction D, the heat-shrinkable film 10 is placed at an appropriate position with respect to the conveyor 6. easy.

Furthermore, in this embodiment, by placing the shaft end 2a of the housing 2 on the heat shrink film 10, the shaft end 2a of the housing 2 and the heat shrink film 10 are brought into contact. Thereby, both 2a and 10 can be easily brought into contact with each other.

Further, in this embodiment, the heat-shrinkable film 10 is placed on the mounting surface 6a, and the hot air is blown diagonally downward with respect to the mounting surface 6a. As a result, the outer periphery of the heat-shrinkable film 10 is lifted up from above the mounting surface 6a by the hot air, so that the influence of the hot air on the corners of the heat-shrinkable film 10 can be suppressed, and the areas other than the corners of the heat-shrinkable film 10 can be suppressed. can be effectively contracted.

Further, in this embodiment, each of the first shrinking process and the second shrinking process is performed while the housing 2 is being transported in a predetermined transporting direction D with the shaft end 2a in contact with the heat-shrinkable film 10. It will be held on. Thereby, the cycle time for covering the shaft end portion 2a of the housing 2 with the heat shrinkable film 10 can be shortened. Furthermore, small size nozzles can be used as the first and second nozzles 7 and 8 in the conveyance direction D of the conveyor 6.

<Example 2>
Next, a method for covering the shaft end of a housing according to the second embodiment will be described, and components that are substantially the same as the method for covering the shaft end of a housing according to the first embodiment will be described using the same reference numerals.

As shown in FIG. 5, the method for covering the shaft end of the housing according to this embodiment is to shrink the outer circumference of the heat-shrinkable film 10, which is rectangular in plan, using the above-mentioned covering device 5. This is a coating method for coating the shaft end 2a of the housing 2. This coating method includes a first shrinking step and a second shrinking step.

A heat-shrinkable film 10 is placed on the upper surface 6a of the conveyor 6 constituting the coating device 5 so that each side 11 to 14 is inclined at 45 degrees with respect to the conveying direction D. Then, the housing 2 is placed on the heat-shrinkable film 10 with its axis perpendicular. By operating the conveyor 6 in this state, the housing 2 is transported in the transport direction D.

In the first shrinking process, while the housing 2 is being transported, hot air is applied to the outer circumferential portion of the heat-shrinkable film 10 from the first side of the housing 2 using the first nozzle 7 to shrink the outer circumferential portion of the heat-shrinkable film 10. partially deflate. Specifically, in the first shrinking step, hot air is applied by the first nozzle 7 along the adjacent first side 11 and third side 13 of the heat-shrinkable film 10 .

According to the first shrinking step, the outer peripheral portion of the heat-shrinkable film 10 is lifted upward by the hot air and is shrunk to cover the side wall of the housing 2 . At this time, among the corners of the heat-shrinkable film 10 that are lifted upward, the corner on the side where the first side 11 and the fourth side 14 intersect, and the second side 12 and the third side 13 The corner portions on the intersecting sides are not easily affected by the hot air (see FIG. 5(b)).

The second shrinking step is performed after the heat-shrinkable film 10 has finished shrinking in the first shrinking step. In this second shrinking step, while the housing 2 is being transported, hot air is applied to the outer circumference of the heat-shrinkable film 10 from a second side of the housing 2 opposite to the first side using a second nozzle 8. to partially shrink the outer periphery of the heat-shrinkable film. Specifically, in the second shrinking process, hot air is applied by the second nozzle 8 along the adjacent second and fourth sides 14 and 12 of the heat-shrinkable film 10 .

According to the second shrinking step, the outer peripheral portion of the heat-shrinkable film 10 is shrunk by the hot air so as to partially cover the side wall of the housing 2 . At this time, among the corners of the heat-shrinkable film 10 that are lifted upward, the corner on the side where the first side 11 and the fourth side 14 intersect, and the second side 12 and the third side 13 The corners on the crossing sides are not easily affected by the hot air, and the handle portions 17 are formed by the corners (see FIG. 5(c)).

According to the housing shaft end coating method of the present embodiment, substantially the same effect as the housing shaft end coating method of the first embodiment is achieved, and the first shrinking step is performed by In the second shrinking process, hot air is applied along the adjacent fourth side 14 and second side 12 of the heat-shrinkable film 10, so that the heat-shrinkable film 10 is heated. Among the corners of the film 10, the corner on the side where the first side 11 and the fourth side 14 intersect, and the corner on the side where the second side 12 and the third side 13 intersect, A large handle portion 17 is formed. That is, among the corners of the heat-shrinkable film 10, the relatively large handle portions 17 are formed at the corners far away from the first and second nozzles 7 and 8.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various modifications may be made within the scope of the present invention depending on the purpose and use. That is, in the above embodiment, the second contraction process is performed after the first contraction process, but the present invention is not limited to this. For example, as shown in FIG. 6, the first and second nozzles 7 and 8 are The conveyors 6 may be arranged so that their phases in the conveyance direction D match, so that the first contraction process and the second contraction process are performed simultaneously.

However, when performing the first and second contraction processes at the same time, the hot air blown out from the first and second nozzles 7 and 8 tends to interfere with each other. Compared to 1 and 2), the stability of the formation of the handle portion 17 is lower.

Further, in the above embodiment, the first and second contraction steps are performed while the housing 2 is being transported, but the present invention is not limited to this. For example, as shown in FIG. 7, the first and second nozzles 7 , 8 may be moved while performing the first and second contraction steps. That is, the first and second contraction steps can be performed with relative movement of the housing 2 and the nozzles 7 and 8.
In the above case, the first and second nozzles 7 and 8 may be moved in a predetermined order or may be moved simultaneously.

Furthermore, for example, as shown in FIG. 8, the first and second contraction steps may be performed using the wide first and second nozzles 7 and 8 while the housing 2 is in a stopped state. In this case, the first and second nozzles 7 and 8 may be operated in a predetermined order, or may be operated simultaneously.

In addition, in the above embodiment, the shaft end 2a of the housing 2 is placed on the heat shrink film 10 to bring the shaft end 2a of the housing 2 into contact with the heat shrink film 10. For example, by placing the heat shrink film 10 on the shaft end 2a of the housing 2, as shown in FIG. They may be made to touch each other. In this case, it is preferable to perform the first and second shrinking steps while pressing the heat-shrinkable film 10 from above with a jig.

Further, in the above embodiment, the first and second nozzles 7 and 8 blow out hot air diagonally downward with respect to the heat shrinkable film 10, but the present invention is not limited to this. The first and second nozzles 7 and 8 may be used to blow out hot air.

Further, in the above embodiment, for example, the first and second nozzles 7 and 8 may constantly blow out hot air while the conveyor 6 is in operation, and depending on the conveyance position of the housing 2, the first and second nozzles 7 and 8 may 8 may be controlled.

The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described in terms of exemplary embodiments, the language used in describing and illustrating the invention is to be understood to be in a descriptive and illustrative rather than a restrictive sense. Changes may be made in the form as detailed herein without departing from the scope or spirit of the invention and within the scope of the appended claims. Although reference has been made herein to specific structures, materials and embodiments in the detailed description of the invention, it is not intended to limit the invention to the disclosure herein; rather, the invention is defined by the appended claims. It shall cover all functionally equivalent structures, methods and uses within the scope.

The present invention is not limited to the embodiments detailed above, and various modifications and changes can be made within the scope of the claims of the present invention.

The present invention is widely used as a technique for covering the shaft end of a cylindrical body with a heat-shrinkable film. In particular, it is suitably used as a technique for covering the shaft end of a housing constituting an oil filter for filtering engine oil with a heat-shrinkable film.

2; housing (cylindrical body); 2a; shaft end; 10; heat-shrinkable film; 11; first side; 12; second side; 17; handle portion.

Claims (6)

A method for covering a shaft end of a cylindrical body, the method comprising: shrinking the outer periphery of a heat-shrinkable film having a rectangular shape, and covering the shaft end of the cylindrical body with the heat-shrinkable film;
With the axial end of the cylindrical body and the heat-shrinkable film in contact with each other, hot air is applied to the outer periphery of the heat-shrinkable film from the first side of the cylindrical body to shrink the heat-shrinkable film. a first shrinking step of shrinking the outer circumference of the
A second side of the cylindrical body opposite to the first side with respect to an outer circumference of the heat-shrinkable film while the shaft end of the cylindrical body and the heat-shrinkable film are in contact with each other. a second shrinking step of shrinking the outer periphery of the heat-shrinkable film by applying hot air from the side;
Shrinking the outer periphery of the heat-shrinkable film through the first shrinking step and the second shrinking step, and simultaneously forming a handle portion on the outer periphery ;
placing the axial end of the cylindrical body on the heat-shrinkable film to bring the axial end of the cylindrical body into contact with the heat-shrinkable film;
In the first shrinking step and the second shrinking step, the heat-shrinkable film is placed on a mounting surface, and hot air is blown diagonally downward toward the mounting surface to shrink the heat-shrinkable film. A method for covering a shaft end of a cylindrical body, comprising lifting the outer peripheral part from the mounting surface and contracting it . The method for covering a shaft end of a cylindrical body according to claim 1, wherein the second shrinking step is performed after the first shrinking step. The first shrinking step includes applying hot air along the first side of the heat shrinkable film,
3. The method for covering a shaft end of a cylindrical body according to claim 1, wherein the second shrinking step includes applying hot air along a second side of the heat-shrinkable film opposite to the first side. The first shrinking step includes applying hot air along adjacent first and third sides of the heat-shrinkable film;
3. The method for covering a shaft end of a cylindrical body according to claim 1, wherein the second shrinking step involves applying hot air along adjacent second and fourth sides of the heat-shrinkable film. Each of the first shrinking step and the second shrinking step is performed while the cylindrical body is being transported in a predetermined transporting direction with the shaft end in contact with the heat-shrinkable film. 5. The method for covering the shaft end of a cylindrical body according to any one of 1 to 4. The method for covering a shaft end of a cylindrical body according to any one of claims 1 to 5, wherein the cylindrical body is a housing that constitutes an oil filter.

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