JP3458187B2 - Core support device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention mainly relates to paper, cloth,
The present invention relates to a winding device that winds a thin and wide sheet such as a plastic film and a metal foil, a winding device that slits and winds the sheet, or a winding core supporting device in an unwinding device that unwinds a sheet wound around a winding core. It is a thing.

[0002]

2. Description of the Related Art Conventionally, in a winding shaft of a wide sheet such as a film or a sheet winding device for slitting a wide sheet and winding the sheet, the sheet is wound around a rotary drive shaft. It has a collar mainly capable of transmitting rotation by frictional coupling and means for transmitting the rotation of the collar to a hollow core such as a paper tube externally inserted in the collar, and the externally inserted core is rotated to a desired rotation. A core support device that rotates in a constrained direction is used.

In this core support device, as a means for transmitting the rotation of the collar to a core such as a paper tube, rolling elements such as rollers are arranged in a plurality of concave portions having inclined bottom surfaces provided on the outer periphery of the collar. It is common that the rolling element is frictionally coupled to the inner surface of the winding core when the rolling element is located at a shallow position on the inclined bottom surface, and various proposals have been made.

In this type of core support device, the direction of rotation in winding a sheet is not always constant, and in the case of performing lower winding and upper winding, for example, when printing on the front and back sides, It is used for rotation in both directions.

At this time, the core support device externally attached to the rotary drive shaft is replaced with respect to the shaft,
Alternatively, exchanging the winding shaft itself requires a great deal of work, which causes a problem in workability.

On the other hand, in order to cope with the rotation in both the forward and reverse directions, two types of concave portions having the opposite inclination directions are provided, and the rolling elements are arranged in each of the concave portions. Then, there is a problem that the structure becomes complicated and the cost becomes high.

The present invention has been made in view of the above, and is capable of rotating in either forward or reverse rotation without increasing the number of parts and without requiring replacement of parts or replacement with respect to a shaft. The present invention provides a core support device for both forward and reverse rotation, which can be easily used correspondingly.

[0008]

In the core support device of the present invention for solving the above-mentioned problems, a collar body provided so as to be capable of transmitting rotation to a rotary drive shaft, a paper tube externally inserted in the collar body, and the like. Means for transmitting the rotation of the collar body to the hollow core of the collar body, and a plurality of concave portions are provided on the outer periphery of the collar body at predetermined intervals in the circumferential direction, and one concave portion is provided for each concave portion. The moving body is movably arranged along the bottom surface, and a part of the moving body projects radially outward at a shallow position of the bottom surface, so that the moving body is engaged with the inserted core, and the core is constrained to rotate. In the core support device, each of the concave portions has a first concave portion having a bottom surface inclined so that one end side in the circumferential direction becomes shallow, and a second concave portion having a bottom surface inclined so that the other end side becomes shallow. The concave part is located between the deep positions of both concave parts via the partitioning convex part. A rolling element provided in each recess is able to move over the protrusion and move between the first and second recesses in a state where a part of the rolling element protrudes outward in the radial direction. It is provided, and is characterized in that the arrangement of the rolling elements can be changed according to the rotation direction.

According to this core support device, a hollow core such as a paper tube is externally inserted, and the paper to be wound or a sheet of plastic film or the like is stopped on the core to provide a rotational resistance. When the collar main body is rotated in one direction together with the rotary drive shaft, the rolling element arranged in one concave portion on the outer peripheral side of the concave portion of the collar main body corresponding to the rotation direction, for example, the first concave portion, It moves to a shallow position on the one end side and a part thereof projects outward in the radial direction, whereby the rolling element is strongly pressed against the inner surface of the winding core and frictionally coupled.
In this state, the outer winding core rotates together with the collar main body through the rolling elements, and the winding is performed. Further, when the collar body is rotated in the opposite direction while the winding core is externally inserted, the rolling element moves to a deep position in the recess, the frictional coupling between the rolling element and the winding core is loosened, and the winding core is axially moved. Can be extracted. At this time, unless the core is removed, the rolling element
Since the winding core prevents a certain amount of outward projection, it is retained in the first concave portion without getting over the partitioning convex portion in the concave portion.

By pulling out the winding core, the rolling element can be projected in the radial direction, so that the partition projection in the recess can be overcome.
Therefore, when it is used in the rotation in the opposite direction to the above, it suffices if the convex portion is overridden and moved to the second concave portion. In this state, the winding core is externally inserted in the same manner as described above to stop the sheet. , When the collar main body is rotated in the opposite direction to the above with the rotary drive shaft, the rolling element moves to a shallow position at the opposite end of the second recess, and a part thereof projects radially. The rotation of the collar body is transmitted to the winding core by frictionally coupling to the inner surface of the winding core.

In the above-mentioned core support device, an annular ring is rotatably provided on the outer periphery of the collar body, and the rolling elements are provided on the ring at required circumferential intervals corresponding to the recesses. It is preferable to provide a notch that holds the ring so that it can be displaced in the radial direction.

Thus, the rolling element can be held without fear of being separated, and the rolling element can be reliably moved in the circumferential direction along the inclined bottom surface of each recess by rotating the ring and the collar body relatively. be able to. Also,
When the winding core is not externally inserted, the rolling element can be appropriately moved between the first and second concave portions in the concave portion.

In the core support device using the ring, the cutout portion is opened on the outer peripheral surface of the ring so that the rolling element can be fitted from the outside in the radial direction of the ring, and both end wall portions of the cutout portion are formed. A screw may be screwed into the ring from the outside in the radial direction of the ring so that the rolling element is prevented from being pulled out by the head of the screw.

This makes it possible to reliably prevent the rolling element from slipping out, replace it with a synthetic resin or rubber rolling element, or replace the worn rolling element with a new one, depending on the form and type of the winding core. In this case, it is only necessary to remove the screw, and the rolling element can be easily replaced.

Further, in the above-described core support device, a small rotating body having an axial center in the radial direction of the collar body is slightly exposed at the circumferentially required spacing position on one side surface of the collar body. Can be.

As a result, in the structure in which the width of the collar body is narrowed and the bush is interposed between the collar drive shaft and the rotary drive shaft, the friction with the collar body of the adjacent core support device is reduced to reduce the torque error. Can be easily absorbed.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described based on an embodiment shown in the drawings.

FIG. 1 is a perspective view showing a state where a part of rolling elements of the core support device according to the present invention is separated, FIG. 2 is a longitudinal sectional view of the core support device of the same, and FIG. Sectional view of line A, FIG.
FIG. 3 is a sectional view taken along the line BB of FIG.

In the figure, (1) shows a core supporting device of a color type provided on the outer periphery of a rotary drive shaft (2) according to the present invention. This core support device (1) has a paper body in which the rotation of the collar body (3) is externally inserted on the outer periphery of a collar body (3) provided so as to be capable of transmitting rotation to a rotary drive shaft (2). A means for transmitting to a hollow core (a) such as a tube is provided, and the core (a) is constrained and rotated to wind up a sheet (b) such as a film slit into an arbitrary width. The color main bodies (3) are arranged in parallel at a required interval in the axial direction of the rotary drive shaft (2), for example.
Rotation is transmitted by the friction coupling means described later.

The means for transmitting the rotation of the color main body (3) to the hollow core (a) such as a paper tube externally inserted therein has the following construction.

On the outer periphery of the collar body (3), a plurality of recesses (5) having a bottom surface inclined in the circumferential direction are provided at required intervals in the circumferential direction as will be described later, for example, as shown in the figure. The recesses (5) are provided at three places at equal angular intervals, and each recess (5) is movable in the circumferential direction along the bottom surface, and a part of the recess (5) is outside the radial direction of the collar body (3) at a shallow position of the bottom surface. Rolling elements (6) such as one roller protruding toward each side are arranged, and are held so that they can be displaced in the radial direction without being separated from each other.

In the case of the figure, an annular groove (7) continuous in the circumferential direction is formed on the outer periphery of the collar body (3) in the widthwise central portion, and an annular ring (8) is formed in the annular groove (7). ) Is rotatably fitted, and the concave portions (5) are formed on both sides of the ring (8) sandwiched therebetween. Further, the rolling element (6) is opened on the outer peripheral surface of the ring (3) at required circumferential positions corresponding to the respective recessed portions (5) of the ring (8), at equiangular intervals in the circumferential direction in the figure. ) Is provided so as to be displaceable in the radial direction of the ring, and the rolling element (6) is fitted and retained in the notch (9) so as not to project beyond a certain amount. The rolling element (6) is provided so as to be able to move in the circumferential direction within the recess (5) as the ring (8) rotates relative to the collar body (3). On the outer periphery of the rolling element (6), in order to increase frictional resistance, for example, knurling or other processing for making minute irregularities (not shown) is applied. Of course, other anti-slip processing can be applied.

In the case of the device of the present invention, each of the concave portions (5) has a first concave portion (5a) having a bottom surface (4a) inclined so that one end side in the circumferential direction becomes shallow, and the other concave portion (5). A second concave portion (5b) having a bottom surface (4b) inclined so that the end side becomes shallow, and a convex portion for partitioning between deep positions (51) (51) of both concave portions (5a) (5b). (10) are connected in series. Reference numerals (52) and (52) indicate shallow positions of the first and second concave portions (5a) and (5b).

At the deep positions (51) (51), the rolling element (6) is held in a state of being submerged from the outer peripheral surface of the collar body (3), and at the shallow positions (52) (52), the rolling elements (6) are held. Part of the rolling element (6) protrudes radially outward of the collar body (3), for example, about 1.5 mm from the outer peripheral surface, so that the rolling element (6) can be strongly pressed against the inner surface of the wound core (a). The rolling element (6) is thereby frictionally coupled to the winding core (a) by the pressure contact force. Although not shown, the rolling element (6) may be provided so as to indirectly engage with the inner surface of the winding core through a pressing member on the outer peripheral portion. The height difference and depth of the inclined bottom surfaces (4a) (4b) are set according to the diameter of the rolling element (6) such as a roller described later, and the height difference is usually set to about 1 to 4 mm.
In addition, in order to securely hold the rolling element (6) at the deep position (51) of the inclined bottom surfaces (4a), (4), the recessed part (5) has a magnet at a required position such as a side surface of the position. It is preferable to embed (11).

Further, in the partitioning convex portion (10), one rolling element (6) arranged in each concave portion (5) partially projects outward in the radial direction of the collar body (3). In this state, for example, in a state where the same extent as in the case of the shallow position (52) is projected, the projecting portion (10) is overcome and the first and second concave portions (5a) (5a)
Its height is set so that it can move between b). In the case of the figure, the top surface of the convex portion (10) is formed at the same height as the bottom surface of the shallow position (52). Thereby, the core (a)
While the rolling element is being extrapolated, the rolling element (6) has a convex portion (10).
However, when the winding core (a) is not extrapolated, the winding core (a) can be moved over the convex portion (10).

In the illustrated embodiment, the notch (9) in the ring (8) is opened to the outer peripheral surface of the ring with an opening width that allows the rolling element (6) to be fitted from the outside in the radial direction of the ring. In the state where the rolling element (6) is fitted into the cutout portion (9), a screw (1) mainly made of a countersunk screw or the like is provided on both end wall portions in the circumferential direction of the cutout portion (9).
2) (12) is screwed into the head (12a) (12
It is provided so as to prevent the rolling element (6) from coming off due to a). The rolling element (6) such as a roller has a groove (61) corresponding to the dish-shaped head (12a) formed at the center in the axial direction. The part contacts the head (12a) to prevent a certain amount of withdrawal.

With the above structure, the rolling element (6) can be easily fitted and held in the notch (9) of the ring (8) from the outside, which facilitates the assembling and the screw. (12) By removing (12), the rolling element (6) can be removed,
When the rolling element (6) is worn, or when the rolling element (6) is replaced with another material such as rubber or synthetic resin material depending on the material of the winding core, it can be easily replaced.

In such a holding structure for the rolling element (6), the concave portion (5) is not always the first concave portion (5) as shown in the figure.
a) and the second recess (5b), which are not limited to those that can rotate in both forward and reverse directions, and can also be applied to a core support device of a type that can rotate in one direction. .

The ring (8) for holding the rolling element (6) is not limited to that shown in the illustrated embodiment, and various implementations are possible. For example, the opening width on the outer peripheral side of the notch (9) into which the rolling element (6) fits is made smaller than the diameter of the rolling element (6) so that the rolling element (6) does not pull out outward. It can be formed and implemented. In addition, a thin ring having a width wider than the recess is rotatably fitted to the collar body, and a recess having an inclined bottom surface is formed on the peripheral surface of the collar body inside the ring, and the ring is placed in the recess. It is also possible to carry out a part of the rolled rolling element so as to protrude from an opening-shaped notch formed at a position corresponding to the recessed portion of the ring. In these cases as well, the concave portion can be configured by the first and second concave portions in the same manner as described above, so that the concave portion can be rotated in both the forward and reverse directions.

Further, the collar body (3) may be formed integrally with the collar body (3), or, as shown in FIG. 1, left and right portions (31) (32) in which respective constituent parts such as recesses are formed. ) May be combined by means such as press fitting. When the collar main body (3) is integrally formed, the ring (8) may be formed by joining the divided half bodies into the annular groove (7). Further, when the ring (8) is integrally formed in an annular shape as shown in the figure, the collar body (3) is configured to be connected by press-fitting the left and right portions (31) (32) as described above. ,
Before the press-fitting, the ring (8) may be fitted in the annular groove (7). With this configuration, it is possible to fit and hold the rolling element (6) in the notch (9) of the ring (8) from the inside.

Further, a small rotating body (15) such as a miniature bearing having an axial center in the radial direction of the collar body (3) is provided on one side surface of the collar body (3) at required circumferential positions. It is arranged slightly exposed. This allows
As shown in the figure, when the bushes (16) and (16) are provided on the inner circumference of both ends of the collar body (3) in the axial direction, and the bushes (16) and (16) are fitted and provided on the rotary drive shaft (2), adjacent core supports are provided. A delicate torque difference between the device (1) and the collar body (3) can be easily absorbed, and a disadvantage such as distortion in the sheet winding state does not occur.

For example, when winding a narrow sheet, the collar main body (3) of the core support device (1) on which the core (a) corresponding to the sheet is externally inserted, and the other color main bodies ( 3) Friction occurs with respect to 3), but a torque difference occurs. However, if the small rotating body (15) is provided as described above, friction does not occur and the inconvenience due to the torque difference does not occur. Good winding action is achieved.

Particularly, when the width of the collar body (3) of the core support device (1) is relatively wide, it is between the inner periphery of both end portions of the collar body (3) and the rotary drive shaft (2). A bearing can be interposed, and a spacer and a collar body of an adjacent core support device are merely interposed to prevent a problem of friction or torque difference between the collar body and an adjacent collar body. If the width is small, a bush is interposed between the inner circumference of the collar body (3) and the rotary drive shaft (2). When a bush is used in this way, if a normal spacer is simply provided between the adjacent collar body, not only the spacer is easily worn but also a torque difference occurs, which causes a problem in the winding state. It will be.

Therefore, the small rotating body (15) is provided as described above, so that no friction is generated between the adjacent color bodies (3) and the above problems can be solved. In addition, it is possible to easily implement the narrow collar body.

Utilizing such a small rotating body (15),
The friction reducing structure between the adjacent color main bodies is not limited to the structure in which the rotation transmitting structure from the color main body to the winding core is adapted to support the rotation in both the forward and reverse directions described above.
The present invention can also be implemented in various core support devices having a structure capable of rotating in any direction.

Further, at the circumferentially equidistant positions of the ring (8), for example, at desired positions between the notches (9) holding the rolling elements (6) as shown in the figure. Is a small rotating body (17) such as a miniature bearing having an axis parallel to the collar axis, and is biased outward by spring means (18) embedded in the core to form a core. (A)
The ring (8) is provided so as to be elastically pressed against the inner surface to facilitate axial extrapolation and removal of the winding core (a), and the ring (8) idles around the winding core (a) when the rotation is started. I try to prevent it.

That is, the inner surface of the hollow core (a) such as a paper tube is inclined with respect to the inner surface of the externally inserted core (a) due to a manufacturing error or partial bending. ) When the rolling element (6) at the deep position (51) of the (4b) cannot come in contact with the frictional resistance, the ring (8) rotates together with the rotation of the collar body (3), and the rolling element (6) 6) cannot roll on the inclined bottom surfaces (4a), (4b) of the concave portion (5), and cannot move to the shallow position (52).

However, when the small rotating body (17) biased outward by the spring means (18) is provided as described above, the winding core (a) is pressed by the small rotating body (17). ), The ring (8) rotates relative to the collar body (3) without causing slippage with respect to the winding core (a), and the rolling element (6) is surely secured. Move to shallow position (52).

A core support device (1) having the above-mentioned structure
Is used to configure a winding shaft in a winding device, and as illustrated in FIG. 2, a rotary drive shaft (2)
Extrapolation is performed at a required small interval in the axial direction of and parallel to each other. At this time, the collar bodies (3) and (3) of each core support device (1)
They are arranged side by side via a spacer or a small rotating body (17) provided on one side of the collar body (3) as shown in the figure, and are rotatably fitted in via a bush (15). .

The friction coupling for transmitting the rotation of the rotary drive shaft (2) to the collar body (3) has the following structure, for example.

Reference numeral (21) is an air pressure passage provided in the axial direction inside the rotary drive shaft (2), and reference numeral (22) is a predetermined interval in the axial direction of the rotary drive shaft (2), for example, the collar body (3). Pressing holes are provided at opposite positions of 180 ° as shown in the drawing, for example, by alternately changing the direction by 90 ° for each mounting position, and from the air pressurizing passage (21) to the outer periphery of the rotary drive shaft (2). Penetrates the surface. Reference numeral (23) is a cylindrical pressing member that slides inside the pressing hole (22), the tip of which is formed in a hemispherical shape, and the packing material (24) is fitted to the outer peripheral surface. In order to rotationally connect the rotary drive shaft (2) and the collar main body (3), high pressure air is sent into the air pressurizing passage (21), and the tip of the pressing member (23) is slightly moved from the outer peripheral surface of the drive shaft (2). It protrudes and presses the inner surface of the collar body (3), and it joins by friction. This coupling force can be adjusted by air pressure, and when the high-pressure air is released, the pressing member (23) is not pressed against the collar body (3) and the frictional connection is released.

Next, a case will be described in which the sheet core (a) such as a paper tube is externally attached to the outside of the core support device (1) to wind the sheet (b).

First, in the state shown by the solid line in FIG. 3, the rolling element (6) has a deep position (5) in one of the concave portions (5), for example, the first concave portion (5a) on the forward rotation side.
In 1), it does not project radially outward from the collar body (3), or even if it projects, it is very small. Therefore, the winding core (a) can be extrapolated in the axial direction without difficulty. At this time, the small rotating body (17), which serves as a pressing means using the spring means (18), is elastically retracted against the spring means (18) by the pressing force by the extra insertion of the winding core (a). By inserting and rotating with the insertion of the core (a), the above-described core extrapolation action can be easily performed without problems.

Then, the end of the sheet (b) is stopped on the core (a) to give a rotation resistance, and together with the rotation drive shaft (2),
When the collar body (3) is rotated in the direction of the arrow, the ring (8) does not rotate due to friction between the winding core (a) and the rolling element (6) or the small rotating body (17) in contact therewith, and the collar body does not rotate. Only (3) rotates, and the rolling element (6) has an inclined bottom surface (4a).
To a shallow position (52), and a part of the rolling element (6) projects radially outward from the outer peripheral surface of the collar body (3) as shown by the chain line in FIG. It is strongly pressed against the inner surface and frictionally bonded to the inner surface of the winding core. After that, the winding core (a) rotates together with the ring (8) in synchronization with the collar main body (3), and the winding is performed.

When the color body (3) is rotated in the reverse direction,
The rolling element (6) moves to a deep position (51) of the inclined bottom surface (4a) and is sunk inward from the outer peripheral surfaces of the collar body (3) and the ring (8), so that the frictional engagement with the inner surface of the winding core (a). Since the contact is released, the winding core (a) can be pulled out without difficulty.

At this time, unless the core (a) is removed,
Since the rolling element (6) is prevented from projecting outward by the inner surface of the winding core, the rolling element (6) does not get over the partitioning convex portion (10) in the concave portion (5), and the first concave portion (5a). Held in.

By pulling out the winding core (a), the rolling element (6) can project in the radial direction. Therefore, as shown by a chain line in FIG. 5, the convex portion (5) in the concave portion (5). You can get over 10).

Therefore, at the time of rotation in the opposite direction due to conversion of the upper winding and the lower winding, the rolling element (6) passes over the convex portion (10) as described above, and the other reverse rotation is performed. It may be moved to the second concave portion (5b) for use.

As described above, when the core (a) is externally inserted to stop the seat (b) and the collar main body (3) together with the rotary drive shaft (2) is rotated in the opposite direction to the above, as described above,
The rolling element (6) forms a bottom surface (4) in the second recess (5b).
It moves to the shallow position (52) at the opposite end along b), and a part of it protrudes in the radial direction, so that it is frictionally coupled to the inner surface of the winding core (a) and the collar body (3) The rotation is transmitted to the winding core (a), and the winding is performed as described above.

In the above embodiment, the case where the winding core is supported by the winding shaft has been described, but the present invention can be used in the same manner as above to form the unwinding shaft of the unwinding device.

Further, it can be used in the same manner when supporting only the both ends of the winding core so that the rotation can be transmitted. Further, as means for transmitting the rotation of the rotary drive shaft to the collar body, the above-mentioned high pressure air utilization is used. The friction main body is not limited to the frictional coupling, and the collar main body (3) can be fixedly coupled to the rotary drive shaft for use.

[0052]

In the core support device of the present invention described above, the first concave portion has the bottom surface inclined so that one end side in the circumferential direction becomes shallow, and the bottom surface inclined so that the other end side becomes shallow. The second concave portion is provided with a concave portion continuous between the deep positions of both concave portions via the partitioning convex portion, and one rolling element is arranged for each concave portion, and the rolling element is By disposing the winding core so as to move over the convex portion and move between the first and second concave portions in a state where the winding core is not inserted, the arrangement of the rolling elements can be changed according to the rotation direction. Since it can be used, it can easily be used for rotation in both forward and reverse directions without increasing the number of parts and without the need for troublesome work such as parts replacement and shaft replacement. Become.

[Brief description of drawings]

FIG. 1 is a partially separated perspective view showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of an assembled state in which the above core support device is mounted on a rotary drive shaft.

3 is a cross-sectional view taken along the line AA of FIG.

4 is a cross-sectional view taken along the line BB of FIG.

FIG. 5 is a cross-sectional view of the same portion as the previous figure showing a usage state in which the rotation direction is reversed in the above.

[Explanation of symbols]

(A) Core (B) Sheet (1) Core support device (2) Rotary drive shaft (3) Color body (4a) (4b) inclined bottom (5) Recess (5a) First recess (5b) Second recess (51) Deep position (52) Shallow position (6) Rolling element (7) Annular groove (8) Ring (9) Notch (10) Partition projection (11) Magnet

Claims (5)

(57) [Claims] 1. A collar body provided so as to be capable of transmitting rotation to a rotary drive shaft, and means for transmitting rotation of the collar body to a hollow core such as a paper tube externally inserted in the collar body. A plurality of recesses are provided on the outer circumference of the collar body at required intervals in the circumferential direction, and one rolling element is arranged in each recess so that it can move along the bottom surface. A core support device that engages with an externally inserted core by protruding outward in the radial direction to constrain and rotate the core, wherein each of the recesses has one end side in the circumferential direction. A first concave portion having a bottom surface inclined to be shallow and a second concave portion having a bottom surface inclined to be shallow on the other end side are provided with a partitioning convex portion between deep positions of both concave portions. The rolling elements, which are arranged in series and arranged in each recess, protrude partly outward in the radial direction. It is provided so as to be able to move over the convex portion and move between the first and second concave portions in the extended state, and the arrangement of the rolling elements can be changed according to the rotation direction. A core support device. 2. An annular ring is rotatably provided on the outer periphery of the collar body, and the rolling element can be displaced in the radial direction of the ring at a required circumferential position corresponding to the recessed portion. The core support device according to claim 1, further comprising a cutout portion that holds the core. 3. The notch has an opening on the outer peripheral surface of the ring so that the rolling element can be fitted from the outside in the radial direction of the ring, and a screw is screwed into both end wall portions of the notch from the outside in the radial direction of the ring. The core support device according to claim 2, wherein the rolling element is provided so that the withdrawal of the rolling element is prevented by the head portion of the screw. 4. A small rotating body having a radial center of the collar body is slightly exposed at one side surface of the collar body at circumferentially spaced intervals. The core support device according to any one of 3 above. 5. A collar body provided so as to be capable of transmitting rotation to a rotary drive shaft, and means for transmitting rotation of the collar body to a hollow core such as a paper tube externally inserted in the collar body. A plurality of recesses are provided on the outer circumference of the collar body at required intervals in the circumferential direction, and one rolling element is arranged in each recess so that it can move along the bottom surface. A core support device that engages with an externally inserted core by restraining the core by protruding outward in the radial direction, wherein an annular ring rotates around the outer periphery of the collar body. The ring is provided with a notch portion for holding the rolling element so as to be displaceable in the ring radial direction, at a required circumferential circumferential position corresponding to the recessed portion. ,
An opening is provided so that the rolling element can be fitted from the outside in the radial direction of the ring, and a screw is screwed into both end wall portions of the notch so that the rolling element is prevented from being removed by the head portion of the screw. A core supporting device characterized by being formed.