JPS6129299B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet winding shaft for winding or unwinding various sheets by extrapolating a core tube. ).

Conventionally, in this type of sheet winding shaft, a roller roller having small-diameter concentric protrusions formed at both ends is formed directly on the outer periphery of the winding shaft, and the protrusions are guided in the circumferential direction on both left and right side walls. Some were housed in recesses with horizontal grooves.

However, in the case of the above-mentioned type, the recess must be formed directly on the winding shaft with high precision, making the machining work troublesome.Moreover, it is difficult to precisely form the lateral grooves directly on the left and right side walls of the recess. The opposing side walls and bottom surface of the concave part support the cutting tool for horizontal groove cutting.
Since the driving space is limited, machining operations are difficult, and it is also necessary to prepare a specially shaped blade.
Moreover, with the winding shaft of the above type, even if the depth from the circumferential surface of the winding shaft to the horizontal groove is ignored, since the roller and the protrusion are integral and concentric, the maximum distance from the radius of the roller to the protrusion is Since the roller protrudes from the circumferential surface of the winding shaft by the amount remaining after subtracting the radius value, if the inner diameter of the core tube is too large compared to the outer diameter of the winding shaft, it is necessary to securely fix the core tube. I can't. On the other hand, core tubes for sheet winding such as paper tubes generally do not have very good accuracy in their inner diameters, and even if the core tubes have the same nominal thickness, their inner diameters vary. In addition, a core tube such as a paper tube is easily deformed.
Therefore, in the case of the above type, all the core tubes cannot be securely fixed, and the core tube may suddenly spin during winding due to an increase in the winding shaft torque, resulting in the wound sheet roll being defective. , winding may be forced to stop.

On the other hand, in this type of winding shaft, a cylinder having an elongated hole parallel to the axis of the polygonal rod is loosely fitted into the polygonal rod, and a cylinder parallel to the axis of the polygonal rod is loosely fitted into the elongated hole. There is also a type in which a roller in contact with the circumferential surface is rotatably mounted on the cylinder (Japanese Utility Model Publication No. 52-6777).

However, in the case of the above type, the outer periphery of the polygonal bar, the inner periphery of the cylinder, and the long hole must be machined with high precision, which is difficult. It is also difficult to loosely fit the cylinder onto the polygonal rod while the rollers are mounted on the shaft so that all the rollers do not fall off. Moreover, in the case of the above type, even if one of the rollers becomes defective, it is not possible to replace each roller individually, and the cylinder must be removed from the polygonal rod in the axial direction. Maintenance work is also troublesome because it has to be replaced after it has been installed. Furthermore, when using this as a long winding shaft, when using a long roller, multiple core tubes are inserted in parallel or in a stepping stone pattern to one winding shaft. It is easy for a part of the inside to be unable to be securely fixed.

Therefore, the present invention provides a winding shaft that does not have the above-mentioned problem.The outline of the invention is to include a polygonal rod serving as the shaft, and to make the polygonal rod into a round rod shape that can be inserted into the core tube. The attached partial cylindrical material, a window-like cutout provided in part or all of the partial cylindrical material, a hollow rotary roller that can roll within the cutout to fix and release the core tube, and the hollow rotary roller. a floating shaft that is movable together with the roller, a part of which is placed in the hollow part so as to be eccentric with respect to the axis of the roller, and the remaining part of which protrudes from both ends of the roller, and provided on the left and right side walls of the window-like cutout; It is characterized by comprising a lateral groove that loosely inserts and guides the remainder of the floating shaft and holds it so that it cannot fall off from the winding shaft.

Next, the present invention will be explained with reference to the drawings.

Figures 1 and 2 show two embodiments of the invention. For the polygonal rod 1 serving as the shaft in each case, a commercially available hexagonal steel tube whose cross section is shown in FIG. 3 is used. Therefore, partial cylindrical members 2 and 3 are attached to each of the six sides of the outer periphery. Items with a window-like cutout 4 in the partially cylindrical material are numbered 2, and those without are numbered 3.

In both Figures 1 and 2, only the portions that fit into the bearings at both ends of the winding shaft are made into cylindrical shaft portions 10 by turning, and the hexagonal portions in between are all covered with partial cylindrical members 2 and 3 to form an apparent round rod. Practically speaking, it is sufficient to cover only the portion where the core tube C is inserted as the winding shaft with the partial cylindrical members 2 and 3.

The method of covering is different between FIG. 1 and FIG. 2. That is, among the six outer circumferential surfaces of the polygonal bar 1 shown in FIG. 1, every other three faces are covered with long partial cylindrical parts 3' covering the entire length of the hexagonal part, and the three faces in between are covered with partial cylindrical parts with 4 short window-like cutouts. 2 and windowless partial cylindrical material 3 are installed alternately.

On the other hand, in the embodiment shown in Fig. 2, partial cylindrical members 2 and 3 with windows and without windows are arranged alternately on all six external surfaces.
The cylindrical parts 2 with windows are alternated so that they are not adjacent to each other. In any of the examples, the cross section including the windowed partial columnar member 2 is as shown in FIG.

As is clear from FIG. 3, in the window-like cutout 4 of the partial cylindrical member 2, there are arranged substantially parallel to the axis of the shaft,
A hollow rock roller 5 rolls in the cutout to fix and release the core tube C, and as a mechanism to prevent it from falling off, it is movable together with the hollow rock roller 5, and a portion of the hollow rock roller 5 is disposed in the hollow portion relative to the axis of the roller. A floating shaft 6, the remaining part of which protrudes from both ends of the roller, is provided on the left and right side walls of the window-shaped cutout 4, and the remaining part of the floating shaft 6 is loosely inserted and guided, and falls off from the winding shaft. There is a transverse groove 7 for holding it in place. FIG. 3 shows the locking roller 5 in the locked position, that is, the roller 5 bites into the narrow space between the inner surface of the core tube C and the circumferential surface of the polygonal rod and fixes both. The details of its operation will be described later, but the third
As shown in the figure, one section of the core tube C is fixed in a three-point supported manner by three rollers 5 protruding from the circumferential surface of the winding shaft. Therefore, this lock prevents the core tube C from becoming eccentric with respect to the polygonal rod 1.

To put it in detail, the three rollers 5 deform the core tube C so that its cross section approaches a triangular shape. However, if the rollers 5 are arranged at intervals or alternately as shown in FIGS. 1 and 2, deformation is restrained. Further, since the core tube (paper tube) C is relatively soft and receives the roller 5 with local elastic recesses, the sheet wrapping surface of the core tube C is not deformed to the extent that it is unsuitable for wrapping. Theoretically, rather than locking the inner circumference of the core tube C with three rollers 5, it is more advantageous to arrange rollers 5 on each outer circumferential surface of the polygonal rod 1 and lock it with six rollers in terms of preventing deformation of the core tube C. However, there is generally no need to do so. Rather, the play between the core pipe C and the circumferential surface of the winding shaft may be made very small, and the number of rollers 5 in one section may be one or two.

If the length of each roller 5 is too short, it will bite into the core tube C deeply, so it is designed to have a pressing area (roller length) that does not cause excessive biting pressure. It is advantageous not to increase the number and length, especially the number, of rollers 5 more than necessary. However, the windowed partial cylindrical material 2 of this invention is mass-produced, and the polygonal bar 1
Because it only needs to be screwed or glued to the circumferential surface of the
There is no need to dig a recess into the round bar shaft and cut the roller 5 into the recess.

The windowed partial cylindrical member 2 is shown in FIGS. 4, 5, and 6. Although this example is a light alloy die-cast product, any other material or manufacturing method may be used, including injection molded resin. The shape of the window-like cutout 4 is not limited to the rectangular shape shown in the figure, but may be an oval shape, a lattice shape, a symmetrical dovetail shape, or the like.

A partial cylindrical member 2 consisting of a plane in contact with one surface of the polygonal bar 1 and a circular arc surface rounding the outer periphery of the polygonal bar 1 has window-like cutouts 4 inside the fixing bolt holes 8 at both ends. The XX cross section of FIG. 4 is shown in FIG. 5, and the Y-Y cross section of FIG. 4 is shown in FIG. 6. A lateral groove 7 is provided on the short side of the rectangular cutout 4 along a plane in contact with the polygonal bar 1. Further, permanent magnets 9 are buried on the left and right sides of the thick side of the long side to attract the roller 5.

9 and 10 show an enlarged view of the state in which the tubular rock roller 5 with a partially non-slip knurl as shown in FIGS. 7 and 8 and the floating shaft rod 6 are housed in the cutout 4. As shown in FIGS. The window-like cutout part 4 of the partial cylindrical member 2 is provided so that one long side is a thick part and the other long side is a thin part. Now, as shown in FIG. 10, when the roller 5 is on the thick part side, the roller 5 rolls toward the thin part with the part being slightly exposed from the arc surface of the partial cylindrical member 2.
When it reaches the position 5' indicated by the chain line in the figure, it protrudes greatly from the arcuate surface. This means that the inner diameter of the rock roller 5 is extremely large compared to the outer diameter of the floating shaft 6 that moves together with the rock roller, and that the floating shaft 6 can be eccentric with respect to the axis of the roller.
This is based on the fact that the remaining portion (both ends) of the lateral groove 7 is loosely inserted into the lateral groove 7. In other words, when the roller roller 5 moves toward the shallow part of the window-like cutout 4, the floating shaft 6 also moves toward the shallow part of the window-like cutout 4, and reaches a position close to the circumferential surface of the winding shaft. However, even if the floating shaft 6 reaches its limit of movement, the roller 5 is not affected and can still move toward the shallow part of the window-like cutout 4 (see FIG. 10).
Therefore, even if the gap between the winding shaft 1 and the core tube C is relatively large (loose), it can be handled within a considerable range, and there is no possibility that the fixation cannot be performed due to insufficient protrusion.

The use of the winding shaft of this invention is extremely simple.
First, in order to extrapolate the core tube C as shown in Figure 1, all you have to do is push in the core tube C, which has an inner diameter slightly larger than the apparent outer diameter of the winding shaft, from one end of the shaft. In order to prevent the core tube C from coming out as shown in FIG. 10 5', push the core tube C while slightly rotating the roller 5 in the direction toward the solid line position in FIG. 10. 10th
Even at the position shown by the solid line in the figure, the rollers 5 are sized to protrude slightly beyond the outer peripheral surface of the winding shaft and maintain contact with the inner surface of the core tube C.

Therefore, the core tube C that has been extrapolated to the required position of the winding shaft
When is relatively rotated in the opposite direction to the extrapolation, that is, in the direction of rolling the roller 5 at the solid line position in Figure 10 to the chain line position 5', the roller 5 rolls and gradually protrudes from the winding shaft peripheral surface It becomes wedged between the inner surface of the core tube C and the outer peripheral plane of the polygonal rod 1 and locks them both. To remove the core tube C from the winding shaft after winding up or unwinding the sheet in this state, it is sufficient to remove the core tube C while turning it in the same direction as when the core tube C was previously inserted. The same applies to extrapolation, but in this embodiment, when the roller 5 approaches the thick side of the cutout 4, the magnet 9
Since it is made to be attracted to the holder, it can be pushed in and pulled out without relative rotation after being attracted.

Only both ends of the floating shaft rod 6 for preventing the roller 5 from falling off are placed in the horizontal grooves 7, 7 of the cutout part and move together with the roller 5, but since it is inserted into the hollow roller 5 whose length is the full width of the cutout part 4, the horizontal groove 7 , I can't escape from 7. The rollers 5 can be tilted to some extent during rolling, but both ends of the rollers move along the vertical plane of the cutout 4, so the rolling stroke is small, and when the core tube C is removed, it is moved along the thick side. Therefore, no undesirable tilting can occur.

Although the present invention has been described above with reference to a small number of embodiments, it goes without saying that the embodiments thereof can be applied in various ways according to the well-known techniques of the designer without departing from the scope of the claims. .

For example, adjust the polygonal rod to the required thickness of the winding shaft, make it triangular,
It is easy to think of square, hexagonal, or octagonal bars. Not only equilateral polygonal rods but also rods with a rectangular cross section can be used. Note that polygonal rods naturally include polygonal tubes.

Making the polygonal rod into a round rod shape that allows the core tube to be inserted outside does not mean that it forms a perfect cylindrical outer surface, but rather that it is rounded enough to allow the core tube to be inserted and the sheet to be wound up. Therefore, it is naturally possible to leave part of the circumferential surface of the polygonal rod as a flat surface. The partial cylindrical material also does not have a simple shape as in the above embodiment, and can be designed in various ways so as to have the minimum number of members supporting the core tube, and is not restricted by the name cylindrical material.

According to the present invention, a partial cylindrical material that can be mass-produced by casting, injection molding, or other methods and that has window-like cutouts in part or all of the outer periphery of a polygonal bar that is generally available on the market is attached to a rotary roller or a polygonal bar. The winding shaft can be completed together with the floating shaft inserted into the roller or simply by attaching it. Therefore, it is possible to simplify the processing work, assembly of the winding shaft, and maintenance work. Further, since the peripheral surface of the winding shaft other than the roller rolling surface is cylindrical, even if the core tube is fixed with the rollers, the core tube will not be significantly deformed. Moreover, since the rock roller and the floating shaft can be eccentric, the amount of protrusion of the roller can be increased compared to conventional winding shafts of the same type. Therefore, even if the inner periphery of the core tube is locally distorted or the difference between the outer diameter of the winding shaft and the inner diameter of the core tube is relatively large, it can be securely fixed by the rock roller.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic illustrations of two embodiments of this invention;
Fig. 3 is an enlarged cross-sectional view common to Figs. 1 and 2, Fig. 4 is a plan view of the partial cylindrical material with the window-like cutout, Fig. 5 is its XX sectional view, and Fig. 6 is Y-Y. 7 is an explanatory diagram of the rock crawler, FIG. 8 is an explanatory diagram of its floating shaft, FIG. 9 is an axial sectional view for explaining the main parts common to both of the above embodiments, and FIG. 10 is a transverse sectional view. It is. 1... Polygonal rod, 2, 3... Partial cylinder material.

Claims (1)

[Claims] 1. In a sheet winding shaft that winds or unwinds a sheet by inserting a core tube into the shaft, a polygonal rod serves as the shaft, and a portion attached to the outer peripheral surface of the polygonal rod so that the polygonal rod becomes a round rod that can be inserted into the core tube. A cylindrical material, a window-like cutout provided in part or all of the partial cylindrical material, a hollow roller that can roll within the cutout to fix and release the core tube, and a hollow roller that is movable together with the hollow roller. A part of the shaft is provided in the hollow part of the roller so as to be eccentric with respect to the axis of the roller, and the remaining part is provided on the left and right side walls of the window-shaped cutout, and the remaining part is provided on the left and right side walls of the window-like cutout, and the remaining part is provided on the left and right side walls of the window-like cutout. A sheet winding shaft characterized by comprising a horizontal groove that loosely inserts and guides the remainder of the shaft and holds it so that it cannot fall off from the winding.