JPS6129298B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides a means for restraining the core tube to rotate with the shaft when a winding core tube or the like is fitted around the outer periphery of the winding shaft, and for releasing the core tube by applying a clutch action to the peripheral surface of the shaft. This invention relates to a type of winding shaft that uses rollers that perform

Conventionally, in this type of sheet winding shaft, small rollers for fixing the core tube with small diameter concentric protrusions formed on both ends were formed directly on the outer periphery of the winding shaft, and the above protrusions were formed on both side walls in the circumferential direction. There was one type that was housed in a recessed part with a horizontal groove that guided it.

However, forming the horizontal grooves directly on both left and right walls of the concave part of the winding shaft as in the above method makes machining work difficult because the opposing side walls and bottom of the concave part limit the supporting and driving space for the cutting tool for cutting the horizontal grooves. Not only is it difficult, but it also requires the preparation of a specially shaped knife.

On the other hand, in order to save the effort of directly forming horizontal grooves on the side walls of the concave part, a roller retaining ring with retaining grooves formed in advance on the end face is fitted concentrically with the winding shaft with the retaining grooves facing each other on both sides of the concave part. There is also a type in which the protrusion formed at the end is inserted into the retaining groove, but in the above type, the retaining ring also serves as the side wall of the recessed part, so the retaining ring does not protrude from the outer periphery of the winding shaft, and It is necessary to provide a small-diameter mounting portion for fitting in the axial direction, which complicates processing and assembly onto the winding shaft. Further, in the case of the above type, when a plurality of recesses are provided in the circumferential direction, each recess must be provided at the same position in the axial direction, which restricts the arrangement of the recesses.

Furthermore, for both types of winding shafts mentioned above, even if the depth from the winding shaft circumferential surface to the horizontal groove (retaining groove) is ignored,
Because the small roller and the protrusion are integral and concentric, the small roller only protrudes from the winding shaft surface by a small amount of the remaining radius after subtracting the radius of the protrusion from the radius of the small roller. If the diameter of the core tube is too large compared to the diameter of the winding shaft, the core tube cannot be securely fixed. On the other hand, core tubes for sheet winding such as paper tubes generally do not have very good inner diameter accuracy;
Even if the core tubes have the same nominal thickness, there are variations in the inner diameter of each core tube. In addition, a core tube such as a paper tube is very easily deformed. Therefore, in the case of both of the above types, it is not possible to securely fix all the core tubes, and the core tube suddenly spins during winding due to an increase in the winding shaft torque, resulting in the wound sheet roll being defective. Or,
In some cases, winding may be forced to stop.

Therefore, the present invention was developed to provide a winding shaft that does not have the above-mentioned problems.
A fitting frame is attached to each of the recesses and has a horizontal groove in the circumferential direction on both left and right side walls, and a hollow frame that can roll on the recess in the circumferential direction and protrude from the circumferential surface of the winding shaft. It is characterized by comprising a roller, and a shaft rod that enters the hollow portion of the hollow roller eccentrically with respect to the axis of the roller and is prevented from falling off the winding shaft by the lateral groove.

Next, embodiments of the present invention will be described with reference to the drawings.

First, FIG. 1 shows an embodiment of the present invention, in which a core tube c is fitted onto a winding shaft 1, and a sheet is wound around the outer periphery of the core tube c, or a wound sheet roll is unwound. In this case, the winding shaft 1 is provided with three inclined recesses 2 having a flat bottom surface at three equal intervals in the longitudinal direction, and at three equal intervals in the circumferential direction of each position, and a fitting that fits each recess 2 is provided. Attach the hollow rollers 4 to each other.
is paid.

2 and 3 show a plane and a cross section of a flat recess 2 provided on the circumferential surface of the winding shaft 1. In this example, both ends of the concave portion 3 are slightly higher step portions and are provided with screw holes 5. FIG. 4 shows a cross section of the fitting frame 3 screwed onto the winding shaft through the screw hole 5. Also, the fifth
As shown in the figure, a shaft rod 9 having an outer diameter sufficiently smaller than the inner diameter and eccentric to the axis of the hollow roller 4 is passed through the inner periphery of the hollow portion of the hollow roller 4, Both ends of the shaft rod 9 are inserted into circumferential lateral grooves 11 perpendicular to the axial direction of both side walls of the fitting frame 3 to prevent them from falling off.

In this embodiment, the upper surface of the fitting frame 3 is arranged to match the circumferential surface of the winding shaft 1, but it is sufficient that it does not protrude excessively from the circumferential surface of the shaft, and it should be at a height that sinks inside the circumferential surface. It's okay to be hot.

In this embodiment, the rolling of the hollow roller 4 is such that the end surface of the hollow roller 4 is connected to the left and right side walls 6a of the window hole 6 of the fitting frame 3.
It is guided and regulated straight by the window hole 6, and the turning distance is
Front and rear sides 6b and 6c serve as stoppers. However, in this example, as a means to prevent the roller 4 from falling off, a permanent magnet 7 is embedded in the rear side 6c of the window hole 6 to attract the hollow roller during standby. Note that if the hollow roller is accurately finished to a length that leaves almost no gap between its end face and the side wall of the recess, the roller can be guided straight as described above, but if there is some gap between it and the side wall of the recess. Even if there is a gap and the roller is slightly tilted due to the gap, there is no practical problem as long as the length is such that both ends of the shaft rod do not fall out of the lateral grooves provided on both side walls of the recess.

Although the hollow roller 4 in FIG. 4 is in contact with the inner periphery of the core tube c at the solid line position, that is, at the deep position of the concave portion 2, it is not pushed in so strongly as to restrain it. However, when the shaft 1 is rotated relative to the core tube c in the direction of the arrow, it rotates toward 4' shown by the chain line in FIG. 2. The upper surface gradually cuts into the narrow area and stops in a wedge-like shape. Therefore, the core tube c is strongly restrained by the winding shaft 1. On the other hand, when the winding shaft 1 or the core tube c is relatively rotated in the opposite direction, the roller 4 immediately returns to the solid line position and is released from the restraint. The hollow roller 4 in this released position is attracted by the permanent magnet 7 as described above, and the shaft rod 9 that has entered the hollow part is moved into the horizontal groove 1.
1 so that it cannot fall off, the core tube c
Even if you remove it, it will not fall off.

Incidentally, the recessed portion 2 may be an oval shape, a hook shape, a symmetrical dovetail shape, etc., and the roller 4 may be a polygonal bar or a polygonal tube. Also, the front side 6b of the fitting frame 3 is eliminated,
It is also possible to use a U-shaped frame with only the side wall 6a and the rear side 6c, and to set a set screw on the concave portion 2 as a front stopper for the roller 4, or to eliminate the front and rear sides.

According to this embodiment, the inner diameter of the roller 4 is extremely large compared to the outer diameter of the shaft rod 9, and the shaft rod can be eccentric with respect to the axis of the roller.
As shown in the figure, when the roller 4 advances to a shallow position, that is, toward 4' in the figure, the amount of protrusion from the outer periphery of the winding shaft 1 can be significantly increased. Therefore, the gap between the winding shaft 1 and the core pipe c is large (loose).
Even in cases such as this, there is no case where it cannot be restrained due to insufficient protrusion.

A concrete example of this method is shown in FIG. 6 and below.
As in the previous example, a flat recess 2 is made in the winding shaft 1, and the fitting frame 3 shown in FIG. 7 is screwed into the recess 2 to obtain the cross section shown in FIG. The one shown in FIG. 7 has a circumferential lateral groove 11 on the lower side of both side walls 6a of the window hole 6. Both ends of the shaft 9 enter into the lateral groove 11 as shown in FIG. 10, and move within the lateral groove 11 as the hollow roller 4 rotates. Further, as shown in FIG. 10, in order to prevent the fitting frame 3 from protruding from the circumferential surface of the winding shaft 1, the fitting frame 3 is attached with a sink bolt 12. In FIG. 4, an attraction magnet 7 is used as the roller 4, but the attraction force of the magnet 7 may be changed to the traction force of a spring, or both may be used in common, or both ends of the shaft rod 9 may be pulled by a spring. Further, these means may not be provided. The point is that by attaching the fitting frame 3 to the flat concave portion 2, the hollow roller 4 can be freely rolled by a required distance and held so as not to fall off. Fit the core tube c onto the outer periphery of the winding shaft with the fitting frame 3 attached,
When the winding shaft 1 is relatively rotated in the winding or unwinding direction, the hollow roller 4 in contact with the inner surface of the core tube c is moved to a shallow position in the fitting frame 3 due to friction, and the core tube c is attached to the winding shaft 1. The dimensions of each part are determined and assembled so that when the hollow roller 4 is restrained and rotated in the opposite direction, the hollow roller 4 moves to a deep position in the fitting frame 3 and the core tube c can be released from the winding shaft 1.

Although the present invention has been described above with reference to a small number of embodiments, it goes without saying that the embodiments thereof may be varied in various ways according to the well-known skills of engineers.

For example, the number and manner of arrangement of the recesses on the circumferential surface of the winding shaft does not matter, and the cross-sectional shape of the bottom surface of the recesses in the direction perpendicular to the axis does not matter. In addition, the winding shaft that uses rollers to fix the core tube, etc.
There are various known types, such as a so-called friction type winding shaft and a winding shaft of a type that locally supports the inner periphery of the core tube, and the winding shaft is not limited to the type shown in the drawings.

According to this invention, since the hollow rollers are regulated and prevented from falling off using a fitting frame that is a separate part from the winding shaft, the machining of the long shaft itself is minimized.
Since the fitting frame is manufactured separately, it can be made with high precision, and by mass-producing it as a precision cast part made of plastic or the like, it is possible to provide a completely new winding shaft that is a composite of a steel shaft and parts such as plastic. . Further, since the fitting frames can be individually attached to and removed from the recesses, assembly and maintenance are easy. Furthermore, the arrangement of the concave portions on the circumferential surface of the winding shaft can be selected relatively freely. In addition, machining of the mounting surface of the fitting frame can be completed in the same process as machining of the concave portion, which is simple.

In addition, since the hollow roller that rolls circumferentially on the concave portion and the rolling element that enters the hollow portion of the hollow roller and can move circumferentially within the lateral groove are 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 circumference of the core tube is slightly distorted locally or the difference between the outer diameter of the winding shaft and the inner diameter of the core tube is relatively large, it is possible to securely fix the core tube.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of one embodiment of the present invention, Fig. 2 is a plan view showing one concave portion thereof, Fig. 3 is a cross-sectional view of Fig. 2, and Fig. 4 is a sectional view of essential parts of this embodiment. , 5th
The figure is a sectional view showing the relationship between the fitting frame and roller in this embodiment, FIG. 6 is a plan view thereof, FIG. 7 is a bottom view of the fitting frame, and FIGS. 8 and 9 are X--X in FIG.
10 is a vertical sectional view of the main part of FIG. 6. 2... Recessed portion, 3... Fitting frame, 4... Roller, 9... Shaft rod.

Claims (1)

[Claims] 1. Circumferential inclined recesses provided at various places on the circumferential surface of the winding shaft; a fitting frame attached to each of the recesses and having circumferential horizontal grooves on both left and right walls; A hollow roller that can roll in the circumferential direction and protrude from the circumferential surface of the winding shaft; and a hollow roller that enters the hollow portion of the hollow roller eccentrically with respect to the axis of the roller, and that falls off from the winding shaft due to the horizontal groove. A sheet winding shaft characterized in that it is equipped with a shaft rod that can control the winding.