Negative pressure supply device

Abstract

To supply a negative pressure supply device capable of supplying negative pressure with high reliability and high efficiency.SOLUTION: A negative pressure supply device 1 has an inner cylinder part 10 and an outer cylinder part 50. The inner cylinder part 10 has a columnar surface-shaped outer peripheral surface 11. The outer cylinder part 50 has a columnar surface-shaped inner peripheral surface 51 facing the outer peripheral surface 11 of the inner cylinder part 10, and is hollowly formed. The outer cylinder part 50 relatively rotates in relation to the inner cylinder part 10. The outer cylinder part 50 includes multiple outer cylinder holes 61A-61F radially penetrating through the outer cylinder part 50. Inside the inner cylinder part 10 includes multiple negative pressure supplying routes 31, 33 mutually non-communicatively separated and communicated with any one of the outer cylinder holes 61A-61F.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a negative pressure supply device.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2015-155313 (Patent Document 1) discloses the following. A cylindrical label in a folded state is received by a take-up member from a label supply device and sucked and held. The label is delivered from the take-up member to two sets of suction rods, and the label is sucked and held by the two sets of suction rods. By separating the two sets of suction rods that suck and hold the label from each other, the label in a folded state is opened. In that state, by lowering the suction rods, the opened label is fitted onto a PET bottle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above document, the label is sucked in order to convey and open the label. It is desired to supply negative pressure to negative pressure operating devices that operate using negative pressure, such as the take-up member and suction rods disclosed in the above document, with high reliability and high efficiency.

[0005] In the present disclosure, a negative pressure supply device that can supply negative pressure with high reliability and high efficiency is proposed.

Means for Solving the Problems

[0006] According to the present disclosure, a negative pressure supply device including an inner cylinder portion and an outer cylinder portion is proposed. The inner cylinder portion has a cylindrical outer peripheral surface. The outer cylinder portion has a cylindrical inner peripheral surface facing the outer peripheral surface of the inner cylinder portion and is formed hollow. The outer cylinder portion rotates relative to the inner cylinder portion. A plurality of outer cylinder holes penetrating the outer cylinder portion in the radial direction are formed in the outer cylinder portion. A plurality of negative pressure supply paths communicating with any one of the outer cylinder holes are provided inside the inner cylinder portion. The plurality of negative pressure supply paths are separated from each other and not in communication.

[0007] In the above negative pressure supply device, the inner cylinder portion is hollow, and the negative pressure supply device further includes a partition plate that hermetically partitions the inner space of the inner cylinder portion to form a plurality of hollow chambers, and each negative pressure supply path may include any one of the hollow chambers.

[0008] The above negative pressure supply device further includes a plurality of negative pressure supply pipes extending in the axial direction of the inner cylinder portion in the inner space of the inner cylinder portion. Each negative pressure supply path includes any one of the negative pressure supply pipes, and each negative pressure supply pipe may open into any one of the hollow chambers.

[0009] In the above negative pressure supply device, an even number of negative pressure supply paths may be provided.

Advantages of the Invention

[0010] According to the negative pressure supply device according to the present disclosure, negative pressure can be supplied with high reliability and high efficiency.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated.

[0013] The negative pressure supply device according to the present disclosure can be used, for example, for a film opener (label opener) for opening a tubular film of a shrink label supplied in a folded state in a sheet shape. The film opener can be used for a film fitting device that fits a film onto an object to be fitted such as a bottle or a PET bottle. As an explanation of the embodiment, first, the film opener will be described.

[0014] FIG. 1 is an operation explanatory diagram schematically showing the operation of the film opener. In FIG. 1, a take-up member 81, an opener 82, and a tubular film F are shown. (a), (c), (e), (g), and (i) in FIG. 1 show schematic views of the take-up member 81 and the opener 82 viewed from above in a plan view. (b), (d), (f), (h), and (j) in FIG. 1 show schematic views of the take-up member 81 and the opener 82 viewed from the side. (a) and (b) in FIG. 1 show schematic views of the take-up member 81 and the opener 82 at the same time viewed from different directions. The same applies to (c) and (d), (e) and (f), (g) and (h), and (i) and (j) in FIG. 1.

[0015] In this film opener, as shown in FIG. 1, first, a cylindrical film F of a predetermined length supplied in a folded state in a sheet form is received by a take-up member 81 sucking and holding one side thereof, and then, an opener 82 receives the cylindrical film F from the take-up member 81 and opens it.

[0016] The opener 82 includes a first suction rod 82a, a second suction rod 82b, a third suction rod 82c, and a fourth suction rod 82d. The first suction rod 82a and the second suction rod 82b suck and hold one side surface of the cylindrical film F in a folded state in a sheet form with a predetermined interval in the width direction. The third suction rod 82c and the fourth suction rod 82d suck the positions corresponding to the first suction rod 82a and the second suction rod 82b, respectively, on the other side surface of the cylindrical film F. When the first suction rod 82a and the second suction rod 82b sucking one side surface of the cylindrical film F and the third suction rod 82c and the fourth suction rod 82d sucking the other side surface of the cylindrical film F move away from each other, the cylindrical film F in a folded state in a sheet form is opened.

[0017] The transfer of the cylindrical film F from the take-up member 81 to the opener 82 and the opening of the cylindrical film F are performed as follows. First, as shown in FIGS. 1(a) and 1(b), the take-up member 81 sucks and holds the cylindrical film F. At this time, the opener 82 is waiting below the take-up member 81. As shown in FIGS. 1(c) and 1(d), the opener 82 rises to a position where the cylindrical film F sucked and held by the take-up member 81 faces the first suction rod 82a and the second suction rod 82b. At this time, a slight gap is formed between the cylindrical film F and the first suction rod 82a and the second suction rod 82b.

[0018] Subsequently, the first suction rod 82a and the second suction rod 82b suction-hold one side of the tubular film F. Thereafter, the operation of the take-up member 81 sucking the tubular film F is stopped, and the holding of the tubular film F by the take-up member 81 is released. As shown in FIGS. 1(e) and (f), when the take-up member 81 retracts upward, the transfer of the tubular film F from the take-up member 81 to the opener 82 is completed.

[0019] Thereafter, as shown in FIGS. 1(g) and (h), the third suction rod 82c and the fourth suction rod 82d of the opener 82 approach the other side of the tubular film F held by suction by the first suction rod 82a and the second suction rod 82b. The third suction rod 82c and the fourth suction rod 82d suction-hold the other side of the tubular film F. Thereafter, the first suction rod 82a and the second suction rod 82b and the third suction rod 82c and the fourth suction rod 82d move in a direction away from each other. By this operation, as shown in FIGS. 1(i) and (j), the tubular film F folded in a sheet-like state is opened.

[0020] Next, a negative pressure supply device 1 for supplying negative pressure to a negative pressure operating device that operates using negative pressure, represented by each suction rod of the take-up member 81 and the opener 82 described with reference to FIG. 1, will be described. FIG. 2 is a plan view schematically showing the negative pressure supply device 1 of the embodiment. FIG. 3 is a schematic cross-sectional view of the negative pressure supply device 1 taken along line III-III in FIG. 2.

[0021] FIG. 4 is a schematic cross-sectional view of the negative pressure supply device 1 taken along line IV-IV in FIG. 3. FIG. 5 is a schematic cross-sectional view of the negative pressure supply device 1 taken along line V-V in FIG. 3. FIG. 6 is a schematic cross-sectional view of the negative pressure supply device 1 taken along line VI-VI in FIG. 3. FIG. 7 is a schematic cross-sectional view of the negative pressure supply device 1 taken along line VII-VII in FIG. 3. FIG. 8 is a schematic cross-sectional view of the negative pressure supply device 1 taken along line VIII-VIII in FIG. 3. FIG. 9 is a schematic cross-sectional view of the negative pressure supply device 1 taken along line IX-IX in FIG. 3.

[0022] The negative pressure supply device 1 includes an inner cylinder part 10. As shown in FIGS. 2 and 3, the inner cylinder part 10 has a substantially hollow cylindrical outer shape, and has a cylindrical outer peripheral surface 11 and a cylindrical inner peripheral surface 12.

[0023] A plurality of partition plates 25, 26, 27, 28 are arranged in the internal space 14 of the inner cylinder part 10. The partition plates 25 to 28 are arranged at intervals in the axial direction of the inner cylinder part 10 (the direction perpendicular to the paper surface in FIG. 2 and the vertical direction in the drawing in FIG. 3). Each of the partition plates 25 to 28 is fixed to the inner cylinder part 10. Each of the partition plates 25 to 28 may be supported by one or a plurality of support columns extending in the axial direction of the inner cylinder part 10, and in this case, the strength of the partition plates 25 to 28 can be improved. The partition plates 25 to 28 airtightly partition the internal space 14 of the inner cylinder part 10. The internal space 14 is divided by the partition plates 25 to 28, and a plurality of hollow chambers 15, 16, 17, 18 are formed. The plurality of hollow chambers 15 to 18 are formed side by side in the axial direction of the inner cylinder part 10.

[0024] One end (the upper end in FIG. 3) of the inner cylinder part 10 is closed by a support plate 29. The hollow chamber 15 is defined by the partition plate 25 and the support plate 29. The hollow chamber 16 is defined by the partition plate 25 and the partition plate 26. The hollow chamber 17 is defined by the partition plate 26 and the partition plate 27. The hollow chamber 18 is defined by the partition plate 27 and the partition plate 28. The partition plate 25 airtightly partitions the hollow chamber 15 and the hollow chamber 16, the partition plate 26 airtightly partitions the hollow chamber 16 and the hollow chamber 17, and the partition plate 27 airtightly partitions the hollow chamber 17 and the hollow chamber 18. Each of the hollow chambers 15, 16, 17, 18 is non-communicating with each other.

[0025] The support plate 29 supports a plurality of negative pressure supply pipes 35, 36, 37, 38. The negative pressure supply pipes 35 to 38 are hollow pipes. The negative pressure supply pipes 35 to 38 are arranged radially inside the inner peripheral surface 12 of the inner cylinder part 10. The negative pressure supply pipes 35 to 38 extend in the axial direction of the inner cylinder part 10 through the internal space 14 of the inner cylinder part 10.

[0026] The negative pressure supply pipe 35 shown in FIG. 3 penetrates the support plate 29 airtightly in the thickness direction and extends toward the hollow chamber 15. The negative pressure supply pipe 35 has a first end 35A and a second end 35B. The first end 35A opens outside the inner cylinder part 10, and the second end 35B opens in the hollow chamber 15 of the inner space 14 of the inner cylinder part 10. The negative pressure supply pipe 35 communicates the outside of the inner cylinder part 10 and the hollow chamber 15.

[0027] The negative pressure supply pipe 37 shown in FIG. 3 penetrates the support plate 29, the partition plate 25, and the partition plate 26 airtightly in the thickness direction and extends toward the hollow chamber 17. The negative pressure supply pipe 37 has a first end 37A and a second end 37B. The first end 37A opens outside the inner cylinder part 10, and the second end 37B opens in the hollow chamber 17 of the inner space 14 of the inner cylinder part 10. The negative pressure supply pipe 37 communicates the outside of the inner cylinder part 10 and the hollow chamber 17.

[0028] Similarly, the negative pressure supply pipe 36 penetrates the support plate 29 and the partition plate 25 airtightly in the thickness direction and extends toward the hollow chamber 16. The negative pressure supply pipe 36 has a first end that opens outside the inner cylinder part 10 and a second end that opens in the hollow chamber 16, and communicates the outside of the inner cylinder part 10 and the hollow chamber 16. Similarly, the negative pressure supply pipe 38 penetrates the support plate 29, the partition plate 25, the partition plate 26, and the partition plate 27 airtightly in the thickness direction and extends toward the hollow chamber 18. The negative pressure supply pipe 38 has a first end that opens outside the inner cylinder part 10 and a second end that opens in the hollow chamber 18, and communicates the outside of the inner cylinder part 10 and the hollow chamber 18.

[0029] On the outer peripheral surface 11 of the inner cylinder part 10, groove parts 21A, 21B, 21C, 21D, 21E, 21F are formed where a part of the outer peripheral surface 11 is recessed. The groove parts 21A to 21F open to the outer peripheral surface 11. The groove parts 21A to 21F extend in the circumferential direction of the inner cylinder part 10. On the radially inner side of the inner cylinder part 10 than the groove parts 21A to 21F, hole parts 22A, 22B, 22C, 22D, 22E, 22F extending in the radial direction of the inner cylinder part 10 are formed. The hole parts 22A to 22F open to the inner peripheral surface 12. Each of the hole parts 22A to 22F communicates the corresponding groove parts 21A to 21F with the internal space 14 of the inner cylinder part 10.

[0030] Each of the groove parts 21A to 21F and each of the hole parts 22A to 22F constitute inner cylinder holes that penetrate the inner cylinder part 10 in the radial direction and open to the outer peripheral surface 11. A plurality of rows of inner cylinder holes that communicate the internal space 14 of the inner cylinder part 10 and the outer peripheral surface 11 are formed at intervals in the axial direction of the inner cylinder part 10. As shown in FIGS. 4 to 9, the inner cylinder holes are formed only in a part of the circumferential direction of the outer peripheral surface 11 of the inner cylinder part 10. The inner cylinder holes are not formed over the entire circumferential direction of the outer peripheral surface 11 of the inner cylinder part 10. The inner cylinder holes do not open to the outer peripheral surface 11 over the entire circumferential direction of the outer peripheral surface 11 of the inner cylinder part 10.

[0031] The negative pressure supply device 1 includes an outer cylinder part 50. The outer cylinder part 50 has a substantially hollow cylindrical outer shape and has a cylindrical inner peripheral surface 51 and a cylindrical outer peripheral surface 52. The inner cylinder part 10 is disposed inside the outer cylinder part 50. The inner peripheral surface 51 of the outer cylinder part 50 faces the outer peripheral surface 11 of the inner cylinder part 10.

[0032] The outer cylinder part 50 rotates relative to the inner cylinder part 10 while forming a minute interval between the outer cylinder part 50 and the outer peripheral surface 11 of the inner cylinder part 10. Typically, the inner cylinder part 10 is fixed and the outer cylinder part 50 is formed to be rotatable. The outer cylinder part 50 is rotatably supported by the inner cylinder part 10 via bearings 41, 42.

[0033] The outer cylinder part 50 is formed with a plurality of outer cylinder holes 61A to 61F that penetrate the outer cylinder part 50 in the radial direction. A plurality of rows of outer cylinder holes are formed at intervals in the circumferential direction across the entire circumferential direction of the outer cylinder part 50. Also, a plurality of rows of outer cylinder holes are formed at intervals in the axial direction of the outer cylinder part 50. A plurality of outer cylinder holes are formed at equal intervals in the circumferential direction and at equal intervals in the axial direction of the outer cylinder part 50. A plurality of rows of inner cylinder holes formed in the inner cylinder part 10 and arranged axially and a plurality of rows of outer cylinder holes formed in the outer cylinder part 50 and arranged axially communicate with each other.

[0034] Specifically, the groove part 21A and the hole part 22A are formed at the same position as the outer cylinder hole 61A in the axial direction. The groove part 21A and the hole part 22A penetrate the inner cylinder part 10 in the radial direction and communicate the internal space 14 of the inner cylinder part 10, specifically the hollow chamber 15, with the outer cylinder hole 61A. The groove part 21B and the hole part 22B are formed at the same position as the outer cylinder hole 61B in the axial direction. The groove part 21B and the hole part 22B penetrate the inner cylinder part 10 in the radial direction and communicate the internal space 14 of the inner cylinder part 10, specifically the hollow chamber 15, with the outer cylinder hole 61B.

[0035] The groove part 21C and the hole part 22C are formed at the same position as the outer cylinder hole 61C in the axial direction. The groove part 21C and the hole part 22C penetrate the inner cylinder part 10 in the radial direction and communicate the internal space 14 of the inner cylinder part 10, specifically the hollow chamber 16, with the outer cylinder hole 61C. The groove part 21D and the hole part 22D are formed at the same position as the outer cylinder hole 61D in the axial direction. The groove part 21D and the hole part 22D penetrate the inner cylinder part 10 in the radial direction and communicate the internal space 14 of the inner cylinder part 10, specifically the hollow chamber 17, with the outer cylinder hole 61D.

[0036] The groove portion 21E and the hole portion 22E are formed at the same position as the outer cylinder hole 61E in the axial direction. The groove portion 21E and the hole portion 22E penetrate the inner cylinder portion 10 in the radial direction, and communicate the internal space 14 of the inner cylinder portion 10, specifically the hollow chamber 17, with the outer cylinder hole 61E. The groove portion 21F and the hole portion 22F are formed at the same position as the outer cylinder hole 61F in the axial direction. The groove portion 21F and the hole portion 22F penetrate the inner cylinder portion 10 in the radial direction, and communicate the internal space 14 of the inner cylinder portion 10, specifically the hollow chamber 18, with the outer cylinder hole 61F.

[0037] As shown in FIG. 3, the negative pressure supply pipe 35, the hollow chamber 15, and the groove portions 21A, 21B and the hole portions 22A, 22B constitute a negative pressure supply path 31. The negative pressure supply path 31 includes an inner cylinder hole that penetrates the inner cylinder portion 10 in the radial direction and opens to the outer peripheral surface 11. The negative pressure supply path 31 is provided inside the inner cylinder portion 10. The negative pressure supply path 31 communicates from the axial end of the inner cylinder portion 10 to the outer peripheral surface 11, and communicates with the outer cylinder holes 61A, 61B. Negative pressure is supplied to the outer cylinder holes 61A, 61B via the negative pressure supply path 31.

[0038] The negative pressure supply pipe 36, the hollow chamber 16, and the groove portion 21C and the hole portion 22C constitute a negative pressure supply path 32. The negative pressure supply path 32 includes an inner cylinder hole that penetrates the inner cylinder portion 10 in the radial direction and opens to the outer peripheral surface 11. The negative pressure supply path 32 is provided inside the inner cylinder portion 10. The negative pressure supply path 32 communicates from the axial end of the inner cylinder portion 10 to the outer peripheral surface 11, and communicates with the outer cylinder hole 61C. Negative pressure is supplied to the outer cylinder hole 61C via the negative pressure supply path 32.

[0039] As shown in FIG. 3, the negative pressure supply pipe 37, the hollow chamber 17, and the groove portions 21D, 21E and the hole portions 22D, 22E constitute a negative pressure supply path 33. The negative pressure supply path 33 includes an inner cylinder hole that penetrates the inner cylinder portion 10 in the radial direction and opens to the outer peripheral surface 11. The negative pressure supply path 33 is provided inside the inner cylinder portion 10. The negative pressure supply path 33 communicates from the axial end of the inner cylinder portion 10 to the outer peripheral surface 11, and communicates with the outer cylinder holes 61D, 61E. Negative pressure is supplied to the outer cylinder holes 61D, 61E via the negative pressure supply path 33.

[0040] The negative pressure supply pipe 38, the hollow chamber 18, the groove portion 21F, and the hole portion 22F constitute a negative pressure supply path 34. The negative pressure supply path 34 includes an inner cylinder hole that penetrates the inner cylinder portion 10 in the radial direction and opens to the outer peripheral surface 11. The negative pressure supply path 34 is provided inside the inner cylinder portion 10. The negative pressure supply path 34 communicates from the axial end of the inner cylinder portion 10 to the outer peripheral surface 11 and communicates with the outer cylinder hole 61F. Negative pressure is supplied to the outer cylinder hole 61F via the negative pressure supply path 34.

[0041] A plurality of negative pressure supply paths 31 to 34 are provided inside the inner cylinder portion 10. In this embodiment, an even number, specifically four negative pressure supply paths 31 to 34 are provided. Each of the negative pressure supply paths 31 to 34 is separated from each other non - communicatively.

[0042] Hollow chambers 15 to 18 are formed in the same number as the negative pressure supply paths 31 to 34, and each of the negative pressure supply paths 31 to 34 includes any one of the hollow chambers 15 to 18. Negative pressure supply pipes 35 to 38 are provided in the same number as the negative pressure supply paths 31 to 34, and each of the negative pressure supply paths 31 to 34 includes any one of the negative pressure supply pipes 35 to 38. The negative pressure supply path 31 includes the hollow chamber 15 and the negative pressure supply pipe 35, the negative pressure supply path 32 includes the hollow chamber 16 and the negative pressure supply pipe 36, the negative pressure supply path 33 includes the hollow chamber 17 and the negative pressure supply pipe 37, and the negative pressure supply path 34 includes the hollow chamber 18 and the negative pressure supply pipe 38.

[0043] As shown in FIG. 3, connecting portions 71, 72, 73, 74, 75, 76 are attached to the outer peripheral surface 52 of the outer cylinder portion 50. Note that the connecting portions 71 to 76 are not shown in the drawings other than FIG. 3.

[0044] The connecting portion 71 is inserted into the outer cylinder hole 61A and communicates the outer cylinder hole 61A with the outside of the negative pressure supply device 1. The connecting portion 72 is inserted into the outer cylinder hole 61B and communicates the outer cylinder hole 61B with the outside of the negative pressure supply device 1. The connecting portion 73 is inserted into the outer cylinder hole 61C and communicates the outer cylinder hole 61C with the outside of the negative pressure supply device 1. The connecting portion 74 is inserted into the outer cylinder hole 61D and communicates the outer cylinder hole 61D with the outside of the negative pressure supply device 1. The connecting portion 75 is inserted into the outer cylinder hole 61E and communicates the outer cylinder hole 61E with the outside of the negative pressure supply device 1. The connecting portion 76 is inserted into the outer cylinder hole 61F and communicates the outer cylinder hole 61F with the outside of the negative pressure supply device 1.

[0045] The negative pressure supply pipes 35 to 38 are connected to a negative pressure source (not shown) such as a vacuum pump. A plurality of negative pressure sources may be provided. One negative pressure source may be branched and connected to a plurality of negative pressure supply pipes. One pump may be connected to the negative pressure supply pipe 35 and the negative pressure supply pipe 36, and another pump may be connected to the negative pressure supply pipe 37 and the negative pressure supply pipe 38.

[0046] By driving the negative pressure source, the air in the negative pressure supply paths 31 to 34 is discharged from the inside of the inner cylinder portion 10 via the first ends of the negative pressure supply pipes 35 to 38. As a result, the inside of the outer cylinder holes 61A to 61F is decompressed.

[0047] The inner cylinder holes (for example, the groove portion 21A and the hole portion 22A shown in FIG. 4) open to the outer peripheral surface 11 only in a part of the circumferential direction of the inner cylinder portion 10. When the outer cylinder portion 50 rotates relative to the inner cylinder portion 10, the communication and non-communication between each of the outer cylinder holes 61A to 61F arranged in the circumferential direction and the inner cylinder hole are switched. Among the outer cylinder holes 61A to 61F formed over the entire circumferential direction of the outer cylinder portion 50 shown in FIGS. 4 to 9, the connecting portions 71 to 76 are connected to a part of the outer cylinder holes 61A to 61F in the circumferential direction. When the outer cylinder portion 50 rotates relative to the inner cylinder portion 10, the communication and non-communication between the outer cylinder holes 61A to 61F to which the connecting portions 71 to 76 are connected and the inner cylinder hole are switched.

[0048] When the outer cylinder holes 61A to 61F to which the connecting portions 71 to 76 are connected overlap the inner cylinder hole and communicate with the inner cylinder hole, negative pressure is supplied to the connecting portions 71 to 76. When the outer cylinder holes 61A to 61F to which the connecting portions 71 to 76 are connected are displaced from the inner cylinder hole and become non-communicating with the inner cylinder hole, the supply of negative pressure to the connecting portions 71 to 76 is stopped. When the outer cylinder portion 50 rotates relative to the inner cylinder portion 10 and the communication and non-communication between the inner cylinder hole and the outer cylinder hole are switched, the supply and stop of negative pressure are switched.

[0049] In order to supply negative pressure to the film opener shown in FIG. 1, the negative pressure supply device 1 can be used. In this case, an air hose (not shown) is connected to the connecting portion 71, and the air hose bifurcates to supply negative pressure to the first suction rod 82a and the second suction rod 82b, so that the cylindrical film F can be sucked by the first suction rod 82a and the second suction rod 82b. When the air hose connected to the connecting portion 72 bifurcates to supply negative pressure to the third suction rod 82c and the fourth suction rod 82d, the cylindrical film F can be sucked by the third suction rod 82c and the fourth suction rod 82d. When the air hose connected to the connecting portion 73 supplies negative pressure to the take-up member 81, the cylindrical film F can be sucked by the take-up member 81. Negative pressure can be supplied from the connecting portions 74 to 76 to another film opener. By rotating the outer cylinder portion 50 relative to the inner cylinder portion 10, the on and off of suction can be switched.

[0050] In the negative pressure supply device 1 of the embodiment having the above configuration, as shown in FIGS. 2 to 9, a plurality of negative pressure supply paths 31 to 34 are provided inside the inner cylinder portion 10, and each of the negative pressure supply paths 31 to 34 communicates with any one of the outer cylinder holes 61A to 61F. Since the plurality of negative pressure supply paths 31 to 34 are separated from each other in a non-communicating manner, even if air leakage occurs in any one of the negative pressure supply paths 31 to 34 or the air hoses connected to each of the negative pressure supply paths 31 to 34, it does not affect the other negative pressure supply paths. Since the number of path branches inside the negative pressure supply device 1 is small, the pressure loss of the air flow in each of the negative pressure supply paths 31 to 34 is reduced. Therefore, according to the negative pressure supply device 1 of the embodiment, negative pressure can be supplied with high reliability and high efficiency.

[0051] Also, as shown in FIG. 3, the inner cylinder portion 10 is hollow. The negative pressure supply device 1 further includes partition plates 25 to 28 that hermetically partition the internal space 14 of the inner cylinder portion 10 to form a plurality of hollow chambers 15 to 18. Each of the negative pressure supply paths 31 to 34 includes any one of the hollow chambers 25 to 28. In this way, by configuring a plurality of hollow chambers 15 to 18 that hermetically partition the hollow internal space 14 as part of the negative pressure supply paths 31 to 34, it becomes possible to more reliably separate the plurality of negative pressure supply paths 31 to 34 from each other in a non-communicating manner.

[0052] Also, as shown in FIGS. 2 and 3, the negative pressure supply device 1 further includes a plurality of negative pressure supply pipes 35 to 38 that extend in the axial direction of the inner cylinder portion 10 in the internal space 14 of the inner cylinder portion 10. Each of the negative pressure supply paths 31 to 34 includes any one of the negative pressure supply pipes 35 to 38. Each of the negative pressure supply pipes 35 to 38 opens into any one of the hollow chambers 15 to 18. In this way, by configuring the negative pressure supply pipes 35 to 38 and the hollow chambers 15 to 18 as part of the negative pressure supply paths 31 to 34, it becomes possible to more reliably separate the plurality of negative pressure supply paths 31 to 34 from each other in a non-communicating manner.

[0053] Also, as shown in FIG. 3, the negative pressure supply device 1 is provided with an even number of negative pressure supply paths 31 to 34. Thereby, the negative pressure supply device 1 can supply negative pressure to a plurality of negative pressure operating devices.

[0054] In the description of the embodiments so far, a hollow internal space 14 is formed inside the inner cylinder portion 10, the internal space 14 is partitioned by partition plates 25 to 28 to form hollow chambers 15 to 18, and negative pressure supply pipes 35 to 38 are arranged in the internal space 14, thereby forming an example of negative pressure supply paths 31 to 34. Not limited to this example, it is also possible to form the negative pressure supply paths 31 to 34 by machining a plurality of bottomed holes in the solid cylindrical inner cylinder portion 10. Note that by making the inner cylinder portion 10 hollow, the overall weight of the negative pressure supply device 1 can be reduced.

[0055] In order to switch between the supply and stop of the negative pressure by the negative pressure supply device 1, the outer cylinder portion 50 may rotate relative to the inner cylinder portion 10. The configuration described in the embodiment, where the inner cylinder portion 10 is fixed and the outer cylinder portion 50 is rotatable, is not the only one. The inner cylinder portion 10 may be rotatable and the outer cylinder portion 50 may be non-rotatable, or both the inner cylinder portion 10 and the outer cylinder portion 50 may be rotatable.

[0056] Although the embodiments have been described as above, it should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of this invention is shown not by the above description but by the claims, and it is intended that all meanings equivalent to the claims and all modifications within the scope are included.

Explanation of Reference Numerals

[0057] 1 Negative pressure supply device, 10 Inner cylinder portion, 11, 52 Outer peripheral surface, 12, 51 Inner peripheral surface, 14 Internal space, 15 to 18 Hollow chambers, 21A to 21F Groove portions, 22A to 22F Hole portions, 25 to 28 Partition plates, 29 Support plate, 31 to 34 Negative pressure supply paths, 35 to 38 Negative pressure supply pipes, 35A, 37A First ends, 35B, 37B Second ends, 41, 42 Bearings, 50 Outer cylinder portion, 61A to 61F Outer cylinder holes, 71 to 76 Connecting portions, 81 Take-up member, 82 Opener, 82a First suction rod, 82b Second suction rod, 82c Third suction rod, 82d Fourth suction rod, F Tubular film.

Claims

1. A hollow inner cylinder having a cylindrical outer peripheral surface, and a hollow outer cylinder having a cylindrical inner peripheral surface facing the outer peripheral surface and rotating relative to the inner cylinder, comprising: a plurality of outer cylinder holes penetrating the outer cylinder in the radial direction are formed in the outer cylinder, inside the inner cylinder, a first negative pressure supply path and a third negative pressure supply path that communicate with any one of the outer cylinder holes and are separated from each other non - communicatively are provided, the first negative pressure supply path includes a first row of inner cylinder holes penetrating the inner cylinder in the radial direction and along the circumferential direction of the inner cylinder, and a second row of inner cylinder holes penetrating the inner cylinder in the radial direction and along the circumferential direction of the inner cylinder, and the first row of inner cylinder holes and the second row of inner cylinder holes are arranged in the axial direction of the inner cylinder, the third negative pressure supply path includes a third row of inner cylinder holes penetrating the inner cylinder in the radial direction and along the circumferential direction of the inner cylinder, and a fourth row of inner cylinder holes penetrating the inner cylinder in the radial direction and along the circumferential direction of the inner cylinder, and the third row of inner cylinder holes and the fourth row of inner cylinder holes are arranged in the axial direction of the inner cylinder, the first row of inner cylinder holes and the third row of inner cylinder holes are arranged at the same position in the circumferential direction of the inner cylinder, the second row of inner cylinder holes and the fourth row of inner cylinder holes are arranged at the same position in the circumferential direction of the inner cylinder, a negative pressure supply device in which the first row of inner cylinder holes and the second row of inner cylinder holes are arranged at different positions in the circumferential direction of the inner cylinder.

2. A hollow inner cylinder having a cylindrical outer peripheral surface, and a hollow outer cylinder having a cylindrical inner peripheral surface facing the outer peripheral surface and rotating relative to the inner cylinder, comprising: a plurality of outer cylinder holes penetrating the outer cylinder in the radial direction are formed in the outer cylinder, inside the inner cylinder, a plurality of negative pressure supply paths that communicate with any one of the outer cylinder holes and are separated from each other non - communicatively are provided, the plurality of negative pressure supply paths include a first negative pressure supply path, a second negative pressure supply path, and a third negative pressure supply path, each of the negative pressure supply paths includes inner cylinder holes penetrating the inner cylinder in the radial direction and along the circumferential direction of the inner cylinder, the inner cylinder holes of the first negative pressure supply path and the inner cylinder holes of the third negative pressure supply path are arranged at the same position in the circumferential direction of the inner cylinder, a negative pressure supply device in which the inner cylinder holes of the first negative pressure supply path and the inner cylinder holes of the second negative pressure supply path are arranged at different positions in the circumferential direction of the inner cylinder.

3. further comprising a partition plate that hermetically partitions the internal space of the inner cylinder to form a plurality of hollow chambers The negative pressure supply device according to claim 1 or claim 2, wherein each of the negative pressure supply paths includes any one of the hollow chambers.

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