JPS6154699B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet winding shaft used for winding up or unwinding a sheet.

Conventionally, for this type of sheet winding shaft, a small roller for fixing the core pipe is formed on the outer periphery of the winding shaft, with small diameter concentric protrusions formed at both ends, and the above protrusions are placed on both side walls in the circumferential direction. Japanese Utility Model Application Laid-open No. 49-24880 discloses a type that is accommodated in a recessed portion in which a guiding groove is formed.

However, in the winding shaft of the above type, because the small roller and the protrusion are integral and concentric, even if the depth from the winding shaft circumferential surface to the guide groove is ignored, the maximum radius of the small roller is The small roller protrudes from the winding shaft surface by only a small amount remaining after subtracting the radius value of the protruding portion from the radius value of the protruding portion. On the other hand, core tubes for sheet winding, such as paper tubes, generally have very poor inner diameter accuracy, and even if the core tubes have the same nominal thickness, there is considerable variation in the size of the individual inner diameters. Since the core tube made of synthetic resin or the like is easily elastically deformed, the portion where the small rollers come into contact with the core tube may be locally depressed. Therefore,
In the case of the above type, if the inner peripheral shape of the core tube is not a perfect circle, the amount of protrusion of the rollers will be insufficient and the rollers cannot be securely restrained. Even if the core tube is restrained, a state in which the amount of protrusion is insufficient may occur due to subsequent deformation of the core tube, etc., and the core tube cannot be restrained, resulting in an idling state.

Therefore, the present invention provides a winding shaft that does not cause the above-mentioned problem. a hollow roller that is capable of rolling within a section and protruding from the circumferential surface of the winding shaft, and that has a hollow section at least at both ends; A floating shaft is provided on the left and right side walls of the recessed portion, and the floating shaft is loosely inserted so as to be movable between the deep and shallow portions of the recessed portion, and the floating shaft protrudes from the end of the roller. and a means for holding it so that it cannot fall off.

The present invention will be explained below based on illustrated embodiments.

First, FIG. 1 is an explanatory diagram of one embodiment of the present invention.
There are three locations on the circumference of the winding effective section of the winding shaft in the longitudinal direction.
There are three concave portions 2 at approximately equal intervals in the circumferential direction.
has been established. Each concave portion 2 is provided with a hollow roller 3 that can roll between the deepest portion and the shallowest portion. Penetrating the inner periphery of the hollow roller 3 is a single floating shaft 4 that is thinner than the inner diameter of the roller and can move between the deep and shallow parts of the recess when the roller 3 rolls. . The floating shaft 4 can be eccentric with respect to the axis of the hollow roller 3 and can freely move relatively, but the floating shaft 4 itself is regulated so that its movement range is kept within the recessed portion 2. The means of regulation are diverse, as described below.

In any case, the hollow roller 3 is always in contact with the inner periphery of the sheet winding core tube C fitted on the winding shaft 1,
When the winding shaft 1 is rotated in the winding or unwinding direction relative to the core tube C, it rotates together with the floating shaft 4 toward the shallow part of the bottom surface of the concave portion 2, protrudes from the winding shaft peripheral surface, and the core tube C is rotated. When it is restrained to the winding shaft 1 and turned in the opposite direction, it moves to the deep part of the bottom of the recessed part 2 and is released from the restraint. Also, core tube C
After the hollow roller 3 has been removed, there is no risk of it falling off because the floating shaft 4 is retained within the concave portion 2.

The structure of this embodiment will be explained in detail below.
The winding shaft 1 avoids the trouble of digging and forming the recessed part 2 only by cutting, and first, a cutout part with a flat bottom surface and an arc-shaped notch with vertical surfaces on the left and right sides of the bottom surface that forms a string is formed at the relevant position. 2a is made to have a cross section as shown in FIG. 2, and the frame 5 shown in FIGS. 3, 3a, and 3b is placed on it and fixed by fitting into the notch 2a.
As shown in FIG. 5, the rectangular hole in the frame 5 serves as the concave portion 2 of the winding shaft 1.

The frame 5 of this embodiment is cut into the winding shaft 1 to fit into the notch 2a, and its outer surface coincides with the circumferential surface of the winding shaft 1. However, even if they do not match, there is no practical problem. The point is that there is no problem in fitting the core tube C, and the hollow roller 3 is housed in the recessed part 2, and the roller 3 is moved between the deep and shallow parts of the recessed part 2 by rolling. All you have to do is become.

In this case, the frame 5 has slightly thin mounting ears 5a at both ends, and is fastened to both ends of the bottom surface of the notch 2a by passing sinking bolts 7 into the mounting holes 6, as shown in FIG. Recessed portion 2 which is a rectangular hole in frame 5
As shown in FIGS. 4 and 7, when attached to the winding shaft 1, the shaft-side flat portion 2a is deep near the center and shallow away from the center. Hollow roller 3 in the deep part
protrudes slightly from the circumferential surface of the winding shaft 1 and comes into contact with the inner circumference of the core tube C, and as it moves to a shallower part, it gradually extends outward from the circumferential surface of the winding shaft and strongly pushes up the inner surface of the core tube C. In particular, since the axial center of the floating shaft 4 can be eccentric with respect to the axial center of the hollow roller 3, the hollow roller 3 that has reached the shallowest part 3' shown by the chain line in FIG. It protrudes extremely large from the surface. The frame 5 is attached to the notch 2a so that the front and rear edges of the rectangular hole are located between the above-mentioned deep and shallow positions. In addition, the recessed part 2 of the frame 5
A permanent magnet 8 is buried in the edge of the hole along the deepest part of the hollow roller 3, and when the hollow roller 3 comes to the deep part of the recessed part 2 and is waiting, it attracts it and does not interfere with the attachment and detachment of the core tube C. . Note that the concave portion 2 may not be rectangular but may be oval, tufted, symmetrical dovetail, or the like. Further, when this winding shaft is used for both winding and unwinding, the driving direction of the core tube C can be easily reversed by changing the direction of the frame 5 by 180 degrees as necessary. Furthermore, it is also possible to attach the frame 5 with its orientation changed in advance.

Now, in order to prevent the hollow roller rolling inside the concave portion 2 from falling off the winding shaft 1 even when the core tube C is removed, in this embodiment, the roller 3 is
A hollow portion is provided in which the floating shaft 4 is passed, and means for regulating the movement of the floating shaft 4 so as to remain within the recessed portion 2 is provided.

In the above-mentioned embodiment, as shown in FIGS. 4 to 7 and 10, a lateral groove 9 is provided along the lower end of the left and right side walls in the recess in the circumferential direction perpendicular to the axis of the winding shaft 1. 9 is also a recess along the bottom surface of the recessed portion 2, that is, the notch portion 2a. Therefore, the lateral grooves 9 serve as movement guide means and drop-off prevention means at both ends of the floating shaft 4 within the hollow roller 3 that rotates on the notch 2a. The hollow roller 3 moves straight with both ends guided and regulated by the side surfaces of the recessed portion. The floating shaft 4 passed through the hollow roller 3 has both ends formed into horizontal grooves 9.
The hollow roller 3 is loosely inserted into the hollow roller 3 and guided and regulated in a straight line, and the hollow portion is regulated by the inner periphery of the hollow roller 3 to move almost in parallel. Therefore, both the hollow roller 3 and the floating shaft 4 keep their axes substantially parallel to the winding shaft 1 and move linearly, and the hollow roller 3 restrains the core pipe C and moves in a straight line.
The floating shaft 4 with both ends loosely inserted therein reliably serves to prevent the hollow roller from falling off when the core tube C is removed. Note that if the hollow roller 3 is accurately finished to a length that leaves almost no gap between its end face and the side wall surface of the recess, it will be regulated by the side wall of the recess and will hardly tilt with respect to the axis of the winding shaft. Even if there is a gap between the side walls of the recess and the shaft is tilted, the winding function will still function as long as both ends of the floating shaft 4 are long enough not to fall out of the horizontal grooves 9 provided on both side walls of the recess. Above, there is no problem.

8 and 9 illustrate a case in which the hollow roller 3 with knurling portions 12 and its idle shaft 4 are long, and FIG. 10 illustrates a case in which it is short. The length is unrelated to the function, and in practice, a long hollow roller 3 and floating shaft 4 reduce the number of concave portions 2 of the winding shaft 1, and if they are short, the frame 5 becomes smaller, but these dimensions are determined by design. The designer should decide according to the conditions. Furthermore, the smaller the diameter of the idler shaft 4 is compared to the inner diameter of the hollow roller, the more the hollow roller 3 moves into the concave portion 2 as shown by the chain line in FIG.
When it comes to the shallow end of the shaft, it protrudes greatly from the shaft circumferential surface. In other words, the tolerance for use even if the core tube C is loose with respect to the winding shaft 1 is increased, and the tolerance to local deformation of the inner circumference of the core tube C is increased. In addition, the hollow roller 3
The outer periphery of may have a polygonal cross section.

Next, another embodiment of means for preventing the hollow roller 3 from falling off by restricting the movement of the floating shaft 4 so as to remain within the recessed portion 2 will be described with reference to FIGS. 11 to 14.

First, the one shown in FIG. 11 is an example in which the hollow portions of the hollow roller 3 are limited to both ends, and a short floating shaft 4 is inserted in each of the left and right hollow portions. The fact that the outer end of the floating shaft 4 moves within the horizontal groove 9 of the frame 5 is the same as in the previous example. However, in this example, if the floating shaft 4 is too thin compared to the inner diameter of the hollow part of the hollow roller 3, there is a risk that its parallel movement will not be maintained. It is better not to make the difference too large.

In order to eliminate the above problems in FIG. 11, FIG. 12 shows that the outer end of the floating shaft 4 is made thinner and the hollow roller
On the other hand, the side 4a that enters the hollow roller 3 is made thicker so that the idle shaft 4 always maintains a position parallel to the hollow roller 3. In this embodiment, the frame 5 is not used, and the recess 2 is directly dug into the circumferential surface of the winding shaft 1. The floating shaft may be held by covering the outer end of the floating shaft using a frame or other member that is attached to the recessed part of the winding shaft, or by directly attaching it to the side wall of the recessed part on the circumferential surface of the winding shaft. The outer end of the floating shaft may be inserted into the machined horizontal groove. When mass producing the winding shaft of this invention, the frame 5 can be inexpensively made of resin, for example, by injection molding, and when producing in small quantities, it is possible to directly reduce the concave portion on the winding shaft as shown in Fig. 12. You can do it as you see fit.

The embodiment shown in FIG. 13 is the floating shaft 4 of the embodiment shown in FIG.
Both ends of the recessed portion 2 are drawn to the deep hole edge of the recessed portion 2 by a coil spring 10. According to this embodiment, when the hollow roller 3 is frictionally driven by the core tube C and rotates upward (shallow part) in the drawing, the spring 10 extends equally on the left and right sides. Also, core tube C
When removing the hollow roller 3, the spring 10 attracts the hollow roller 3 deep into the concave portion 2, so there is no risk of interfering with the removal.

In the embodiment shown in FIG. 14, both the free shaft itself and the movable range regulating means penetrate into the hollow roller 3,
Both ends of the coil spring 11 are fixed to the concave portion 2 along the horizontal groove 9, and the action etc.
There is no particular difference from the one in Figure 3.

Although a small number of embodiments have been described above, it goes without saying that the embodiments of the present invention can be variously changed and applied according to the designer's known techniques without changing the gist thereof.

For example, the number of recesses provided on the circumferential surface of the winding shaft in the circumferential direction and the axial direction does not matter, and when a plurality of recesses are provided, the spacing between the recesses, that is, the arrangement of the recesses does not matter. In addition, the winding shaft is, for example, disclosed in Japanese Unexamined Patent Publication No. 55-56940 or Japanese Utility Model Publication No. 55-2702.
It may also be of other known formats, such as those disclosed in US Pat. Although it is convenient to attach the core tube by using a magnet or a spring to attract the hollow roller toward the deep part of the recess as in the illustrated embodiment, the desired effect can be achieved even without such means. be able to. In the illustrated embodiment, the hollow roller located at the deepest portion slightly protrudes from the circumferential surface of the winding shaft, but it does not necessarily need to protrude. It is sufficient that the recessed part has at least a deep part and a shallow part,
The shape of the bottom surface does not matter.

According to the present invention, the hollow roller that moves between the shallow part of the recessed part and the deep part, and the floating shaft inserted in the hollow part of the hollow roller can be eccentrically moved, so that the hollow roller moves between the shallow part of the recessed part. Since the floating shaft also moves toward the shallow part of the concave portion to a position close to the circumferential surface of the winding shaft (see Fig. 7), the winding speed on the roller is smaller than that of the conventional winding shaft of the same type. The amount of protrusion from the shaft circumferential surface can be increased. Therefore, even if the inner periphery of the core tube is slightly distorted locally, or the core tube is made of easily deformable material, or if the difference between the outer diameter of the winding shaft and the inner diameter of the core tube is relatively large, Also, it becomes possible to securely fix the core tube, and it is possible to prevent the core tube from idling during winding or unwinding. Moreover, it is also possible to simplify the structure and rationalize the processing work compared to the conventional method.

[Brief explanation of the drawing]

FIG. 1 is an overall explanatory diagram of one embodiment of the present invention, and FIG.
The figure is a sectional view of the concave portion of the winding shaft before assembly,
The figure is a bottom view of the frame in Figure 1, Figures 3a and 3b are X-X and Y-Y sectional views in Figure 3, respectively, Figure 4 is a sectional view of the winding shaft after assembly, and Figure 5 is a cross-sectional view of the winding shaft after assembly. Figure 1 is an enlarged plan view of the concave portion, Figure 6 is an enlarged sectional view of the frame attachment part to the winding shaft, Figure 7 is an explanatory diagram of the action of the hollow roller, Figure 8 is an explanatory diagram of the hollow roller, and Figure 9 is an explanatory diagram of the hollow roller. An explanatory diagram of the floating shaft that constitutes the floating shaft, FIG. 10 is a sectional view of the vicinity of the concave portion in FIG. 1, FIGS. 11 and 12 are sectional views of the vicinity of the concave portion of the other two embodiments, and FIGS. 13 and 14 are further FIG. 7 is a plan view of the vicinity of a concave portion of two other embodiments. 2...Concave portion, 3...Hollow roller, 4...Idle shaft, 9...Horizontal groove, 11...Coil spring.

Claims (1)

[Scope of Claims] 1. A concave portion provided on the circumferential surface of the winding shaft and having a deep portion and a shallow portion in the circumferential direction; and a concave portion that can roll within the concave portion and protrude from the circumferential surface of the winding shaft, a hollow roller having a hollow portion at least at both ends; a floating shaft that is eccentric with respect to the axis of the hollow roller, enters the hollow portion of the hollow roller and projects from the end portion of the roller; and the recessed portion. a sheet winding shaft provided on the left and right side walls of the recess, means for loosely inserting the floating shaft so as to be movable between a deep part and a shallow part of the recessed part, and holding the floating shaft so that it cannot fall off from the winding shaft. . 2. The sheet winding shaft according to claim 1, wherein the floating shaft is a coil spring having both ends fixed in the recess and penetrating a hollow roller.