Sheet winding core
A spring-biased sheet winding core with expandable and contractible pipe halves addresses the need for reusable cores, reducing material costs by enabling repeated use without sheet damage.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- OKAYAMA NOEISHA
- Filing Date
- 2024-11-07
- Publication Date
- 2026-05-19
AI Technical Summary
The need for multiple sheet winding cores during agricultural sheet removal increases material costs, necessitating a reusable sheet winding core design.
A sheet winding core with a first and second pipe half connected by hinges and biased by a spring, allowing expansion and contraction to facilitate repeated use.
Enables the reuse of the sheet winding core, reducing material costs by allowing it to be repeatedly used without damaging the agricultural sheets.
Smart Images
Figure 2026082466000001_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to a sheet winding core.
Background Art
[0002] In fields where agricultural crops such as fruits are cultivated, strip-shaped reflective sheets are installed to color the fruits. Also, in fields where agricultural crops such as vegetables are cultivated, strip-shaped covering sheets are installed to promote heat retention and moisture retention of the soil. For these agricultural sheets such as reflective sheets and covering sheets, it is common to remove them from the field using a sheet winding machine after harvesting the agricultural crops (see Patent Document 1).
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] By the way, when removing an agricultural sheet from a field, a sheet winding core such as a paper tube is attached to a sheet winding machine, and the agricultural sheet is wound by rotating this sheet winding core. After that, the wound agricultural sheet is removed from the sheet winding machine together with the sheet winding core, and a new sheet winding core is attached to the sheet winding machine in preparation for the next winding. That is, when removing many agricultural sheets from the field, it is necessary to replace the sheet winding core for each agricultural sheet, so it was necessary to prepare many sheet winding cores. Thus, using many sheet winding cores is a factor that increases material costs, and there is a demand for a sheet winding core that can be repeatedly used.
Means for Solving the Problems
[0005] According to this disclosure, the sheet winding core has a first pipe half consisting of a plurality of first plate portions connected to each other in the short direction via a bent portion, and a second pipe half consisting of a plurality of second plate portions connected to each other in the short direction via a bent portion. The sheet winding core has a hinge connecting a first base plate portion located on the base end side of the plurality of first plate portions and a second base plate portion located on the base end side of the plurality of second plate portions. The hinge is equipped with a spring that biases the first base plate portion and the second base plate portion toward each other. [Effects of the Invention]
[0006] According to this disclosure, the sheet winding core can be removed from the wound sheet, and the sheet winding core can be reused repeatedly. [Brief explanation of the drawing]
[0007] [Figure 1] Figure 1 is a perspective view showing an example of a sheet winding machine. [Figure 2] Figure 2 is a perspective view showing a sheet winding machine with a sheet winding core attached. [Figure 3] Figure 3 is a perspective view showing the winding process of agricultural sheets using a sheet winding machine. [Figure 4] Figure 4 is a perspective view showing a sheet winding core, which is one embodiment of the present disclosure. [Figure 5] Figure 5 is an exploded perspective view showing a portion of the sheet winding core. [Figure 6] Figure 6 is a side view showing the sheet winding core from the direction of arrow VI in Figure 4. [Figure 7] Figure 7 is a perspective view showing a portion of the sheet winding core from the direction of arrow VII in Figure 6. [Figure 8A] Figure 8A is a cross-sectional view showing an agricultural sheet and a sheet winding core. [Figure 8B] Figure 8B is a cross-sectional view showing an agricultural sheet and a sheet winding core. [Figure 9A]Figure 9A is a cross-sectional view showing the outer circumference of the sheet winding core when it is operating in the extended state. [Figure 9B] Figure 9B is a cross-sectional view showing the outer circumference of the sheet winding core when it is operated in the retracted state. [Modes for carrying out the invention]
[0008] Embodiments of this disclosure will be described in detail below with reference to the drawings. In the following description, identical or substantially identical components and elements will be denoted by the same reference numerals, and repeated descriptions will be omitted.
[0009] <Sheet winding machine> Figure 1 is a perspective view showing an example of a sheet winding machine 10. As shown in Figure 1, the sheet winding machine 10 has an extendable base frame 11, a pair of leg frames 12 and 13 attached to the base frame 11, and wheels 14 attached to the base frame 11. The sheet winding machine 10 also has a reduction unit 15 attached to the end of the base frame 11 and an engine 16 attached to the reduction unit 15. The reduction unit 15 houses a reduction pulley (not shown), and a drive shaft 17 connected to this reduction pulley protrudes from the reduction unit 15. In other words, the engine 16 and the drive shaft 17 are connected to each other via the reduction unit 15.
[0010] The sheet winding machine 10 has a vertical frame 20 attached to a base frame 11 and two vertical frames 21 and 22 attached to a leg frame 12. A support shaft 23 is rotatably mounted on the vertical frame 20, and a support shaft 24 is rotatably mounted on the vertical frame 21. The support shaft 23 of the vertical frame 20 and the support shaft 24 of the vertical frame 21 face each other, and roller shafts 25 are attached to the support shafts 23 and 24. A driven shaft 26 is rotatably mounted on the vertical frame 22, and this driven shaft 26 faces the drive shaft 17 of the reduction unit 15. The vertical frame 22 can be tilted in the direction of arrow A1 by sliding a locking member 27 attached to the vertical frame 22 upward.
[0011] Figure 2 is a perspective view showing a sheet winding machine 10 with a sheet winding core 30 attached, and Figure 3 is a perspective view showing the winding of agricultural sheets 100 by the sheet winding machine 10. As shown in Figure 2, sheet winding cores 30 for winding agricultural sheets 100 such as reflective sheets are attached to the drive shaft (rotating shaft) 17 and driven shaft (rotating shaft) 26 of the sheet winding machine 10. As shown in Figure 3, the agricultural sheet 100 is folded back by being wrapped around the roller shaft 25, and the end of the agricultural sheet 100 is wound onto the sheet winding core 30 and attached. Once the attachment of the agricultural sheet 100 to the sheet winding core 30 is complete, the drive shaft 17 is rotated in the direction of arrow B1 using the engine 16, and the agricultural sheet 100 is wound onto the sheet winding core 30 as shown by arrow B2. Once the winding of the agricultural sheet 100 is complete, the rolled-up agricultural sheet 100, along with the sheet winding core 30, is removed from the sheet winding machine 10. When attaching or detaching the sheet winding core 30 from the sheet winding machine 10, the distance between the drive shaft 17 and the driven shaft 26 is widened by tilting the vertical frame 22.
[0012] <Sheet winding core> Figure 4 is a perspective view showing a sheet winding core 30, which is one embodiment of the present disclosure, and Figure 5 is an exploded perspective view showing a part of the sheet winding core 30. Figure 6 is a side view showing the sheet winding core 30 from the direction of arrow VI in Figure 4. Figures 4 and 6 show the sheet winding core 30 attached to the drive shaft 17 and the driven shaft 26, that is, the sheet winding core 30 in the expanded state described later. As shown in Figures 4, 5 and 6, the sheet winding core 30 has a first pipe half 40 made of a metal material such as stainless steel, a second pipe half 50 made of a metal material such as stainless steel, and a plurality of hinges 60 that connect the first pipe half 40 and the second pipe half 50 to each other. The first pipe half 40 has two bent portions 41 and 42 extending in the longitudinal direction, and the second pipe half 50 has two bent portions 51 and 52 extending in the longitudinal direction.
[0013] The first pipe half 40 has a plurality of plate portions 43, 44, and 45 that are connected to each other in the short direction α via bent portions 41 and 42. In other words, the first pipe half 40 has a base plate portion (first base plate portion, first plate portion) 43 that extends in the longitudinal direction, an intermediate plate portion (first plate portion) 44 that extends in the longitudinal direction, and a tip plate portion (first tip plate portion, first plate portion) 45 that extends in the longitudinal direction. The base plate portion 43 is a plate portion located on the base end side in the short direction α, and the tip plate portion 45 is a plate portion located on the tip side in the short direction α. The base plate portion 43 and the intermediate plate portion 44 are connected via a bent portion 41, and the intermediate plate portion 44 and the tip plate portion 45 are connected via a bent portion 42. As shown in Figure 4, the base plate portion 43 of the first pipe half 40 has an engagement groove 46 that engages with a pin (not shown) of the drive shaft 17.
[0014] The second pipe half 50 has a plurality of plate portions 53, 54, 55 that are connected to each other in the transverse direction α via bending portions 51, 52. That is, the second pipe half 50 has a base end plate portion (second base end plate portion, second plate portion) 53 that extends in the longitudinal direction, an intermediate plate portion (second plate portion) 54 that extends in the longitudinal direction, and a tip plate portion (second tip plate portion, second plate portion) 55 that extends in the longitudinal direction. The base end plate portion 53 is a plate portion located on the base end side in the transverse direction α, and the tip plate portion 55 is a plate portion located on the tip side in the transverse direction α. The base end plate portion 53 and the intermediate plate portion 54 are connected via the bending portion 51, and the intermediate plate portion 54 and the tip plate portion 55 are connected via the bending portion 52.
[0015] The hinge 60 has a mounting plate 61 connected to the base end plate portion 43 of the first pipe half 40 and a mounting plate 62 connected to the base end plate portion 53 of the second pipe half 50. The mounting plate 61 of the hinge 60 is attached to the base end plate portion 43 using screws 63 and nuts 64. Similarly, the mounting plate 62 of the hinge 60 is attached to the base end plate portion 53 using screws 65 and nuts 66. Further, a hinge shaft 67 is inserted into the cylindrical portion 61a of the mounting plate 61 and the cylindrical portion 62a of the mounting plate 62, and the mounting plate 61 and the mounting plate 62 are rotatable about the hinge shaft 67. Furthermore, a spring 68 that biases the first pipe half 40 and the second pipe half 50 is attached to the hinge shaft 67. The spring force of this spring 68 biases the mounting plate 61 and the mounting plate 62 in a direction to approach each other. That is, as shown by an arrow Fs in FIG. 6, the spring 68 provided in the hinge 60 biases the hinge 60 in a closing direction, that is, in a direction to approach the base end plate portions 43, 53 to each other.
[0016] As shown in FIG. 6, the distance L1 from the rotation center C1 of the hinge 60 to the inner edge 48 of the end face 47 provided on the tip plate portion 45 is longer than the distance L2 from the rotation center C1 of the hinge 60 to the outer edge 58 of the end face 57 provided on the tip plate portion 55. That is, the distance L1 from the rotation center C1 of the hinge 60 to the end face (edge) 47 of the tip plate portion 45 and the distance L2 from the rotation center C1 of the hinge 60 to the end face (edge) 57 of the tip plate portion 55 are different from each other. As a result, the movement locus X1 of the inner edge 48 of the tip plate portion 45 and the movement locus X2 of the outer edge 58 of the tip plate portion 55 do not intersect with each other. That is, even when the pair of pipe halves 40 and 50 are opened and closed about the hinge axis 67, the tip plate portion 45 and the tip plate portion 55 do not contact each other.
[0017] As shown in FIG. 6, the base end plate portion 53 of the second pipe half 50 extends so as to cover the hinge 60. That is, the base end plate portion 53 is arranged to overlap in the radial direction of the hinge shaft 67, and as shown by reference numeral Y2, the end face 59 (edge) of the base end plate portion 53 is located radially outside (arrow β) of the outer peripheral surfaces 61b and 62b of the cylindrical portions 61a and 62a of the hinge 60. Here, FIG. 7 is a perspective view showing a part of the sheet take-up core 30 from the direction of arrow VII in FIG. 6. As shown in FIG. 7, by extending the end face 59 of the base end plate portion 53 radially outside the outer peripheral surfaces 61b and 62b of the cylindrical portions 61a and 62a, the hinge 60 does not project outward from the base end plate portion 53 of the second pipe half 50, and as will be described later, it is possible to prevent the agricultural sheet 100 from being caught on the hinge 60.
[0018] <Removal of Agricultural Sheet> FIGS. 8A and 8B are cross-sectional views showing the agricultural sheet 100 and the sheet take-up core 30. FIG. 8A shows the sheet take-up core 30 attached to the drive shaft 17 and the driven shaft 26, and FIG. 8B shows the sheet take-up core 30 removed from the drive shaft 17 and the driven shaft 26. Further, FIG. 9A is a cross-sectional view showing the outer peripheral length L3a of the sheet take-up core 30 operated in the expanded state, and FIG. 9B is a cross-sectional view showing the outer peripheral length L3b of the sheet take-up core 30 operated in the contracted state.
[0019] As shown in Figure 8A, when the sheet winding core 30 is attached to the drive shaft 17 and driven shaft 26 of the sheet winding machine 10, the inner surfaces 40a and 50a of each pipe half 40 and 50 contact the outer surfaces 17a and 26a of the drive shaft 17 and driven shaft 26, respectively, so that each pipe half 40 and 50 is held open against the spring force of the spring 68. In other words, as shown in Figure 9A, the sheet winding core 30 is held in an expanded state in which each pipe half 40 and 50 is opened to increase the outer circumference length L3a. Then, as shown in Figure 8A, when the sheet winding core 30 is rotated to wind the agricultural sheet 100, the agricultural sheet 100 comes into contact with the outer surfaces 40b and 50b of each pipe half 40 and 50.
[0020] As described above, once the winding of the agricultural sheet 100 by the sheet winding core 30 is complete, the agricultural sheet 100, along with the sheet winding core 30, is removed from the sheet winding machine 10 by the operator. In other words, since the sheet winding core 30 is removed from the drive shaft 17 and driven shaft 26 of the sheet winding machine 10, the pipe halves 40 and 50 are closed by the spring force of the spring 68, as shown in Figure 8B. That is, the spring force of the spring 68 closes the pipe halves 40 and 50, and the intermediate plate portion 44 of the first pipe halves 40 and the tip plate portion 55 of the second pipe halves 50 come into contact with each other. In other words, as shown in Figure 9B, the sheet winding core 30 is held in a contracted state in which the outer circumference length L3b is reduced to less than the outer circumference length L3a by closing the pipe halves 40 and 50.
[0021] In this way, by removing the sheet winding core 30 from the sheet winding machine 10, the sheet winding core 30 can be deformed from an expanded state to a contracted state. As a result, as shown in Figure 8B, the agricultural sheet 100 can be separated from the outer surfaces 40b, 50b of each pipe half 40, 50. In other words, a gap G can be created between the agricultural sheet 100 and the sheet winding core 30, making it possible to remove the sheet winding core 30 from the rolled agricultural sheet 100. This allows the sheet winding core 30 to be reused repeatedly, thereby reducing material costs.
[0022] Furthermore, as shown in Figure 7, since the hinge 60 does not protrude outward from the base plate portion 53 of the second pipe half 50, the sheet winding core 30 can be removed from the agricultural sheet 100 without damaging the agricultural sheet 100 with the hinge 60. In addition, truss screws with curved heads are used as screws 63 and 65 for attaching the hinge 60. Moreover, as shown in Figure 4, the corners of each pipe half 40 and 50 are chamfered. These points also help to prevent the agricultural sheet 100 from getting caught on the sheet winding core 30, thereby preventing damage to the agricultural sheet 100 and reducing material costs.
[0023] <Variation> This disclosure is not limited to the embodiments described above, and it goes without saying that various modifications are possible without departing from the spirit of the disclosure. The illustrated first pipe half 40 is composed of three plate portions 43, 44, and 45, but is not limited thereto, and the first pipe half 40 may be composed of two plate portions, or the first pipe half 40 may be composed of four or more plate portions. Similarly, the second pipe half 50 is composed of three plate portions 53, 54, and 55, but is not limited thereto, and the second pipe half 50 may be composed of two plate portions, or the second pipe half 50 may be composed of four or more plate portions.
[0024] The illustrated plate portions 43, 44, and 45 are planar in shape, but are not limited to this, and the first pipe half 40 may be constructed using curved plate portions. Similarly, the illustrated plate portions 53, 54, and 55 are planar in shape, but are not limited to this, and the second pipe half 50 may be constructed using curved plate portions. Furthermore, the illustrated pipe halves 40 and 50 are not limited to press-formed products, and may be manufactured using extruded materials such as aluminum alloy. In the above description, springs 68 are provided on all hinges 60 constituting the sheet winding core 30, but are not limited to this, and springs 68 may be provided on some of the hinges 60 constituting the sheet winding core 30. It is possible to use torsion coil springs as the springs 68 provided on the hinges 60.
[0025] In the illustrated example, the sheet winding core 30 is provided with six hinges 60, but it is not limited to this, and the sheet winding core 30 may be provided with one to five hinges 60, or seven or more hinges 60. In the illustrated example, truss screws with curved heads are used as screws 63 and 65 for attaching the hinges 60, but it is not limited to this, and countersunk screws or the like may be used to attach the hinges 60. Also, the illustrated sheet winding machine 10 is equipped with an engine 16, but it is not limited to this, and a sheet winding machine that rotates the sheet winding core 30 manually may be used. Furthermore, agricultural sheets such as reflective sheets and covering sheets are given as examples of sheets wound by the sheet winding core 30, but it is not limited to this, and the sheet winding core 30 of this disclosure may be used when winding sheets used for purposes other than agriculture. [Explanation of Symbols]
[0026] 10...Sheet winding machine, 17...Drive shaft (rotating shaft), 26...Driven shaft (rotating shaft), 30...Sheet winding core, 40...First pipe half, 41,42...Bending section, 43...Base plate section (first base plate section, first plate section), 44...Intermediate plate section (first plate section), 45...Tip plate section (first tip plate section, first plate section), 47...End face (end), 50...Second pipe half, 51,52 ...bent section, 53...base plate section (second base plate section, second plate section), 54...intermediate plate section (second plate section), 55...tip plate section (second tip plate section, second plate section), 57...end face (end), 59...end face (end), 60...hinge, 61a...tube section, 61b...outer surface, 62a...tube section, 62b...outer surface, 67...hinge axis, 68...spring, C1...center of rotation, α...short direction
Claims
1. A sheet winding core used by being attached to the rotating shaft of a sheet winding machine, A first pipe half consisting of a plurality of first plate sections connected to each other in the shorter direction via a bent portion, A second pipe half consisting of a plurality of second plate sections connected to each other in the shorter direction via a bent portion, A hinge connecting a first base plate portion located at the base end of the plurality of first plate portions and a second base plate portion located at the base end of the plurality of second plate portions, It has, The hinge is equipped with a spring that biases the first base plate portion and the second base plate portion toward each other. Sheet winding core.
2. In the sheet winding core according to claim 1, The first pipe half comprises a first tip plate portion located towards the tip of the plurality of first plate portions, The second pipe half comprises a second tip plate portion located at the tip end of the plurality of second plate portions, The distance from the rotation center of the hinge to the end of the first tip plate portion and the distance from the rotation center of the hinge to the end of the second tip plate portion are different from each other. Sheet winding core.
3. In the sheet winding core according to claim 1, The aforementioned hinge includes a cylindrical portion that supports the hinge shaft, The end of the first base plate portion or the second base plate portion is located radially outward from the outer circumferential surface of the cylindrical portion. Sheet winding core.