JP2888704B2 - Winding shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which a plurality of webs, such as papers and films, are wound on the same axis, and each web is referred to as a core.
The above relates to a winding shaft for winding with independent torques.

[0002]

2. Description of the Related Art Conventionally, this kind of winding shaft is called individual friction winding, and a winding torque is generated by friction driving each web coaxially to wind each web individually. These are generally used in many cases. In addition, as a mechanism for generating each individual torque, a mechanism that utilizes the rolling resistance of a ball bearing, a mechanism that generates an induction torque, a hysteresis torque, and the like by using magnetism are known in addition to a mechanism that uses friction.

[0003] However, all of the conventional winding shafts support a core holder for supporting a core for winding each web on a single rotating shaft so as to be rotatable with respect to the shaft by some kind of bearing mechanism. The above-mentioned torque generating mechanism is incorporated inside or on the side of the core, and the rotating shaft is driven at a rotation speed (rotation speed) of the core required for winding, that is, a rotation speed higher than the rotation speed during winding of the core holder, and the rotation is performed. The torque generating mechanism is configured to generate torque by slipping by a torque difference mechanism by a number difference. In these winding shafts, the rotation speed of the core holder and the rotation speed of the rotation shaft are different regardless of the type of torque generating mechanism employed. The run-out in the direction causes a run-out of a frequency different from the rotation speed in the core holder, so that the outer circumference of the wound product does not become a perfect circle and the winding side faces are not aligned neatly. There were drawbacks. These drawbacks are more pronounced as the web width of the wound product is smaller and the winding diameter is larger.

[0004] There is no other way to improve the above-mentioned drawbacks except by making the working accuracy of each component extremely high and making the fitting clearance small. However, these methods are limited, so that a fundamental solution is impossible at all. Met.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to completely eliminate the above-mentioned disadvantages of the prior art and to easily obtain a wound product having a perfectly circular outer periphery and a winding side face aligned neatly. To provide a winding shaft that can be used.

[0006]

According to the present invention, there is provided a winding shaft comprising:
In a winding shaft that winds a plurality of webs on each core with independent torque on the same shaft, a thin-walled pipe is fixed so as not to rotate, and a common drive shaft is rotatable inside the pipe. A core holder for holding each core is provided rotatably on the outside, and a transmission means for individually transmitting a driving torque by magnetism from the drive shaft to each core holder through a pipe wall is provided. I have.

[0007] The torque generating mechanism for generating the driving torque includes a portion for generating a relative rotating magnetic field based on the rotation of the drive shaft and one of a portion for generating an induction torque, a hysteresis torque, or a combined torque thereof by the rotating magnetic field. The other may be a driving side and a driven side, respectively. In this case, the torque generating mechanism is provided inside or outside the pipe, and the driving of the torque generating mechanism provided between the driven side of the torque generating mechanism provided inside the pipe and the core holder or between the drive shaft and the outside of the pipe. A magnetic coupling may be provided via a pipe wall between the drive shaft and the core holder, and without using the magnetic coupling, the drive side and the driven side of the torque generating mechanism are one and the other of the drive shaft and the core holder. May be separately arranged via a pipe wall.

[0008]

In the above construction, the driving torque is transmitted from the driving shaft to each core holder through the pipe wall by the transmission means. In this case, since the pipe, which is a shaft that rotatably supports the core holder, is fixed, even if the straightness of the pipe is poor and the core holder or its bearing mechanism oscillates, it does not move once per rotation of the core holder. Swing
With respect to the virtual rotation center including the swing, the wound product can be wound exactly without swinging.

[0009]

1 is a sectional view of an upper half of a winding shaft according to an embodiment of the present invention, FIG. 2 is a sectional view of the left half taken along line AA 'in FIG. 1, and a right half thereof is a sectional view taken along line B-A of FIG. FIG. 4 is a partial cross-sectional view taken along line B ′.

In FIG. 1, a core holder 3 is rotatably supported via a bearing 2 outside a thin pipe 1 having both ends or one end fixed. A core or the like is fixed at a predetermined position on each core holder 3 when the web is wound up. The mechanism is already known,
Since it can be freely designed according to the shape, material, operation method and purpose of the core, illustration and description are omitted.

Inside each core holder 3, an outer iron core 4 and a collar 6 are provided so as to keep an interval between the two bearings 2, and the outer iron core 4 is lightly pressed into the inner wall of the core holder 3, or It is fixed with adhesive. The core holders 3 are sequentially arranged on the pipe 1 via the space ring 7 at a predetermined pitch, and the core holders 3 (not shown) at the both ends are fixed so as not to move in the axial direction. As described above, a large number of webs (not shown) are simultaneously wound on a large number of cores (not shown) on the core holders 3 arranged at a predetermined pitch, thereby forming a wound product.

In the center of the inside of the pipe 1, one common drive shaft 8 whose both ends are supported by bearings or the like (not shown).
The inner magnet 10 and the inner iron core 11 are arranged on the drive shaft 8 at positions corresponding to the outer magnets 5 in the core holder 3, and they are mounted on a bearing 12 together with other components described later on a bearing 12. It is rotatably assembled with respect to.

The outer iron core 4 and the outer magnet 5 and the inner magnet 10 and the inner iron core 11 constitute a magnetic coupling. In this case, both the outer magnet 5 and the inner magnet 10 have magnetic poles in a radial direction, In addition, the magnets are arranged in the same number with their polarities reversed with respect to their circumferentially adjacent ones, and are strongly adhered to the outer iron core 4 and the inner iron core 11 forming magnetic paths.

Further, a torque generating mechanism composed of parts 13 to 19 is incorporated next to each set of the inner magnet 10 and the inner iron core 11 on the drive shaft 8. First, the drive shaft 8
A boss 18 is engaged with a key groove of the drive shaft 8 via a pin 19 so as to rotate integrally with the drive shaft 8, and a magnet holder 15 is attached to a side surface of the boss 18 with a magnet backup plate 17 made of a magnetic material interposed therebetween, such as small screws. , And a plurality of magnets 16 are held at predetermined positions by the magnet holder 15. Each magnet 16 is fitted into a correspondingly shaped hole of the magnet holder 15 with the front and back polarities reversed with respect to the adjacent magnet 16, and is attracted to the magnet back-up plate 17 on the back side. On the front side facing the magnet holder 15, an induction plate 1 made of a good electrical conductor is kept with a small gap therebetween.
An induction backup plate 13 made of a magnetic material such as pure iron 4 not magnetized together with the inner iron core 11 is fastened and fixed to the outer ring of the bearing 12 via other holding parts with small screws or the like, and is rotatable on the drive shaft 8. It is provided in.

Also, on the drive shaft 8, there are collars 20, 2 to arrange the above-mentioned many components at predetermined intervals and positions.
1 are provided and fixed at the both ends (not shown). Further, the bearing disk 9 has an outer periphery formed by an O-ring or the like so that the drive shaft 8 is prevented from bending and the inner magnet 10 rotates while maintaining the center without contacting the inner periphery of the pipe 1 with a slight gap. The drive shaft 8 is supported via bearings while being lightly supported by the inner periphery of the drive shaft 1. In addition, this bearing disk 9
Is not necessary for each winding unit, and is provided, for example, once every several pitches. In order to prevent the temperature inside the pipe 1 from rising due to heat generated by the induction plate 14, the bearing disk 9
A plurality of window holes through which cooling air is passed are formed on the plate surface.

In the above configuration, since the magnets 16 in which the N poles and the S poles are alternately arranged in the axial direction in the axial direction are arranged in the magnet holder 15 in the circumferential direction, the induction plate 14 has many alternations. Magnetic flux penetrates vertically. Therefore, if the drive shaft 8 and the outside of the bearing 12 are relatively rotated, the induction plate 14 crosses the alternating magnetic flux, and generates an induction current (eddy current) therein, thereby causing a secondary magnetic flux. And the original magnetic flux attract each other to generate an induction torque having a strength substantially proportional to the relative rotation speed. If the induction backup plate 13 is magnetized very slightly, a small amount of hysteresis torque is generated, but this hysteresis torque is almost constant regardless of the rotational speed. Since the principle of generating these torques is known, detailed description is omitted.

On the other hand, the outer magnet 5 and the inner magnet 10 attract each other through the pipe 1 wall at the respective N and S poles, and form a closed magnetic path via the outer core 4 and the inner core 11. Then, when the phase of both the inside and outside is going to shift, a strong force that tries to return the phase shift by both the attractive force between the different poles and the repulsive force between the same poles of the adjacent magnet acts. A so-called magnetic coupling effect is produced in which the transmission is performed at the same rotational speed while maintaining the phase shift according to the torque. In addition, naturally, if a torque equal to or more than the maximum holding torque is applied to the magnetic coupling, a slip occurs and the coupling does not work. Therefore, the magnetic coupling is provided with a holding torque equal to or more than the maximum value of the required torque of the induction torque. This constitutes a magnetic coupling.

By the above operation, the drive shaft 8 is driven at a rotation speed faster than the rotation speed of the core necessary for winding, and the required slip torque is generated by controlling the slip rotation speed of the difference therebetween. In this case, the torque is transmitted to the core holder 3 through the respective magnetic couplings, and the individual members are wound with a required tension.

It is needless to say that the torque generating mechanism is not limited to the mechanism that generates the above-described induction torque and the like, and that any other known mechanical friction torque can be used. Also, in the induction torque, the torque generating function of the magnet 16 and the induction plate 14 is only relative, and even when the generated torque is transmitted to the outside of the pipe 1 by the magnetic coupling, the same series of the same torque is used. Since the force is transmitted, for example, the driving side and the driven side of the induction torque generating mechanism can be arranged in reverse.
The rotation of the drive shaft 8 is first transmitted to the outside of the pipe 1 by a magnetic coupling, and an induction torque can be generated there. If the induction torque generating mechanism is provided outside the pipe 1, there is an advantage that it is almost unnecessary to actively cool the heat generated in the induction plate 14.

Next, FIG. 3 is a half sectional view of a winding shaft according to a second embodiment of the present invention, and FIG. 4 is a sectional view taken along line CC 'in FIG.

In the second embodiment, inside the pipe 1,
Inner magnet 10 and inner core 1 similar to those shown in FIG.
1 is provided as a drive side of an induction torque generating mechanism for generating a strong rotating magnetic field, is attached to a drive shaft 8 with a pin 19, and a driven side is provided in a core holder 3 outside the pipe 1; This eliminates the need for magnetic coupling and greatly simplifies the structure.

As the driven side of the induction torque generating mechanism, an induction iron core 30 in which a copper or aluminum induction cage coil 31 is embedded, which is similar to the rotor of a known induction motor, is fixed inside the core holder 3. However, instead of this, a structure in which copper is adhered to the inner periphery of an iron core, or a structure of only iron may be used since iron itself also conducts electricity. In the case of the present embodiment, since an induction current is generated and heat is generated outside the pipe 1, a sufficient cooling effect can be obtained even by natural cooling.

In the above two embodiments, the permanent magnet 16 and the inner magnet 10 are all fixed on the drive shaft 8 as the drive side of the induction torque generating mechanism. Since wires can be wired by drilling a hole at a part of the outer periphery of the shaft or at the center of the shaft, electromagnets wired in series or in parallel can be used instead of the magnets on each drive side, in which case the slip rotation speed is constant. Torque can be controlled by direct current from outside.

It is preferable that the material of the pipe 1 is generally a non-magnetic material and a poor conductor of electricity.

[0025]

Since the winding shaft according to the present invention is constructed as described above, it is possible to easily obtain a wound product having a winding outer periphery of a perfect circle and a winding side surface aligned neatly.

[Brief description of the drawings]

FIG. 1 is an upper half sectional view of a winding shaft according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view along the line AA ′ in FIG.
The right half thereof is a partial cross-sectional view taken along the line BB 'in FIG.

FIG. 3 is a half sectional view of a winding shaft according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along line C-C 'in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 3 Core holder 5 Outer magnet 8 Drive shaft 10 Inner magnet 14 Induction plate 16 Magnet

Claims (4)

(57) [Claims] 1. A winding shaft in which a plurality of webs are wound on respective cores with independent torque on the same shaft, a thin pipe is fixed so as not to rotate, and a common drive is provided inside the pipe. A shaft is rotatably provided and a core holder for holding each core is rotatably provided on the outside, and a transmission means for individually transmitting driving torque by magnetism from the drive shaft to each core holder through a pipe wall is provided. A winding shaft characterized by that. 2. A torque generating mechanism for generating a driving torque includes: a portion for generating a relative rotating magnetic field based on rotation of a drive shaft; and a portion for generating an induction torque, a hysteresis torque, or a combined torque thereof by the rotating magnetic field. The winding shaft according to claim 1, wherein one and the other are respectively a drive side and a driven side. 3. A torque generating mechanism which is provided inside or outside a pipe, between a driven side of the torque generating mechanism provided inside the pipe and a core holder, or between a driving shaft and outside the pipe. 3. The winding shaft according to claim 2, wherein a magnetic coupling is interposed between the driving side and the driving side via a pipe wall. 4. The winding shaft according to claim 2, wherein the driving side and the driven side of the torque generating mechanism are separately disposed on one and the other of the driving shaft and the core holder via a pipe wall.