JPH11208942A - Sheet winding shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of part items so as to make manufacture easy and low in cost, facilitate attachment/detachment of a core to/from a winding part and attain excellent winding with such constitution that the core is appropriately supported to the winding part during winding and released from the winding part upon the completion of winding, that the winding part rapidly locks the core at the time of starting to wind and that a sheet is wound onto each core with specified winding tension. SOLUTION: Rollers 25 are arranged in recessed parts provided at the outer peripheral surfaces of collars 12 annularly fitted in a rotatable state to a shaft 11, so as to be movable in the circumferential direction of the collars 12. Cover rings 14 rotatably supported to the shaft 11 through annular bearings 13 and provided with opening parts 27 into which the rollers 25 can be partially protruded, are arranged at the outer peripheral surface of the collars 12. Receiving rotational resistance by a sheet to the collars 12 rotated at the beginning of winding rotation, the cover rings 14 maintain the positions to protrude the rollers 25 and to lock the rollers 25 to mounted cores 50, and the cores 50 are rotated together with the collars 12 by this locking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet winding shaft for winding a sheet by attaching a winding core to a winding shaft.

[0002]

2. Description of the Related Art Conventionally, a winding shaft for winding a narrow sheet, which is formed by slitting a wide sheet of paper or plastic film, etc., vertically, winds a large number of cores (usually a paper tube). The narrow sheet is wound on the winding core by attaching it to the winding part of the winding shaft, and after the winding is completed, the whole core is removed and a new winding core is wound on the winding shaft. It is designed to be attached to the part. Therefore, when the core is mounted or removed, the core must be free with respect to the winding shaft, and the core must be fixed to the winding shaft during winding. As described above, the winding shaft that releases or fixes the winding core when necessary is a rotating force transmitting unit that transmits the rotation of the rotating shaft to a collar that is rotatably provided around the rotating shaft, and attached to the collar. Various structures having a locking means for locking the wound core and transmitting the rotation of the collar to the core have been proposed.

As one of such winding shafts, for example, as disclosed in Japanese Patent Application Laid-Open No. 5-17055,
A circumferential groove is formed on the outer periphery of the collar body provided to be capable of transmitting rotation to the rotary drive shaft, and an annular ring is rotatably fitted in the groove, and a bottom surface is provided on a side portion of the groove. A concave notch having an inclined bottom surface such that one end in the circumferential direction is shallower with respect to the tangential direction is provided, and the annular ring is provided at a position corresponding to the concave notch, on the outer periphery with a width smaller than the inner portion. A notch portion that opens is provided, and a rolling element that rolls on the inclined bottom surface is inserted into the notch portion so as to protrude partially from the opening. When the rolling element is at a shallow position on the inclined bottom surface, the rolling element is notched. There has been proposed a core supporting device which is projected from the entrance and is engaged with the inner surface of the core.

In the above-mentioned core supporting device, when a hollow core such as a paper tube is mounted on the collar, the core comes into contact with the collar body, the annular ring on the outer periphery of the collar, and the rolling elements held on the annular ring, respectively. It will be in a state of having done. In this state, when the sheet belt is stopped on the core and rotation resistance is given to rotate the collar body together with the rotary drive shaft, the frictional resistance caused by the contact between the rolling element held by the annular ring and the inner surface of the core causes the annular shape. The collar body rotates without rotating the ring, and accordingly, the rolling element moves from the deep position of the concave notch to the shallow position, and projects from the opening of the notch on the outer circumference of the annular ring. As a result, the rolling elements are 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 body via the annular ring and the rolling element, and winding or unwinding is performed.

However, in the above-mentioned technique, the annular ring has a configuration in which a pair of semi-annular halves are fitted into the groove and the two are joined by screws to form an annular shape. There is an inconvenience that the production is troublesome, the number of parts increases, and the cost increases. In addition, since the annular ring is fitted so as to be exposed on the outer peripheral surface of the collar, dirt and the like are easily clogged on the sliding surface between the annular ring and the collar,
Therefore, frictional resistance between the annular ring and the collar is increased, and smooth sliding may be difficult. As a result, at the start of rotation of the rotary drive shaft, the annular ring rotates integrally without sliding with the collar, and the rolling element cannot move from the deep position to the shallow position on the inclined bottom surface, and the frictional connection is reduced. May not be done. Furthermore, because the width of the annular ring is smaller than the width of the collar body, there are slight irregularities on the inner peripheral surface of the core, such as a paper tube, and the degree of adhesion between the annular ring and the inner surface of the core is reduced. In the case where it is not sufficient, there is also a problem that the annular ring rotates integrally with the collar body, so that the frictional connection is delayed, and uniform winding is not performed on a plurality of winding cores.

In the above-mentioned technique, when a plurality of core supporting devices are arranged side by side and winding is performed, even in a core supporting device in which no core is mounted after the previous winding is completed. In many cases, the rolling element is moved to a shallow position from the search position on the inclined bottom surface due to the rotational force. Therefore, in the work of mounting the next core, it is difficult to mount the core unless the rolling element is moved from a shallow position to a deep position on the inclined bottom surface. To move the rolling element from a shallow position to a deep position. Also in this case, since the width of the annular ring is smaller than the width of the collar body, check the position of each annular ring, and resist the frictional resistance between the annular ring and the collar body. Work such as reversing the ring is complicated and time-consuming.

[0007]

Therefore, in view of the above circumstances, the present invention allows a narrow winding core to be mounted, the winding core is appropriately supported by the winding portion during winding, and the winding core is completed at the end of winding. Is to be released from the winding portion, and to allow the sheet to be wound with a predetermined winding tension on each winding core,
At the start of winding, the winding section quickly locks the winding core, so that good winding can be started, the number of parts is small, the manufacturing is easy and inexpensive, and the sheet winding shaft is provided with respect to the winding section. An object is to facilitate attachment and detachment of a core.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a plurality of winding portions having a collar rotatably coupled to a shaft are arranged in the longitudinal direction of the shaft. A roller is disposed in a concave portion provided on the outer peripheral surface side of the collar so as to be movable in a peripheral direction of the collar, and a cover ring is rotatably disposed on the outer peripheral surface of the collar; Is provided with an opening through which a part of the roller can protrude outward, and is rotatably supported on a shaft via an annular bearing.The movement of the roller causes the roller to protrude from the opening of the covering in the radial direction of the collar. A locking portion that can be submerged is provided, and a locking portion that guides the roller in a protruding direction when the shaft is rotated is locked in a contact state with the winding core mounted on the winding portion. A sheet winding shaft,
In each corresponding portion of the shaft with respect to the collar, a plurality of vertical holes penetrating in the radial direction of the shaft so as to face the inner peripheral surface of the collar by communicating with an air introduction passage along the shaft longitudinal direction inside the shaft, A piston member is provided radially around the air introduction path, and a piston member is movably arranged in each of the vertical holes, and the piston member comes into sliding contact with the collar by air pressure applied to the air introduction path. The object of the present invention is to solve the above problem by providing a sheet winding shaft characterized by the following. In the present invention, it is preferable to provide a spring member that applies a biasing force in a direction in which the roller is submerged.

In the present invention, before starting winding, each roller is retracted from the opening of the cover ring, and the winding core is mounted in a free state with respect to the winding section. At the time when the winding core is mounted on each winding unit and the winding shaft starts rotating, the collar starts to rotate by transmitting the rotational force from the piston member, but is supported rotatably around the shaft via bearings. The cover ring, which is provided with rotation resistance by stopping the narrow sheet on the core attached to the outer periphery of the cover ring, keeps its original position without rotating with the collar, and the collar and the cover ring Relatively move the roller from the deep part to the shallow part of the inclined bottom surface, a part of the roller protrudes from the opening of the cover ring, abuts on the inner peripheral surface of the winding core and is locked, At the same time, the core starts rotating. After the winding is completed, in the winding section where the winding core is mounted, the shaft is reversely rotated and the roller is guided in the direction of moving from the shallow part to the deep part, and a part of the roller is opened from the opening of the covering. It retracts and the winding core is released from the winding unit. In the winding section where the winding core is not mounted, the cover ring covers the entire width of the winding section and is supported by the shaft via a bearing. Even if the cover is stopped in a state where the roller is located at the shallow part, the cover ring can be given reverse rotation without receiving frictional resistance, and the roller moves from the shallow part to the deep part As a result, a part of the roller retracts from the opening of the cover ring, and the operation of mounting the next core can be performed smoothly. Because the piston member comes into contact with the collar in a slidable state, if the tensile force applied to the narrow sheet during winding changes, the collar with respect to the rotating shaft may change. The degree of slippage does not change, so that the pulling force on the narrow sheet to be wound does not change.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of a main portion of a winding section in an axial longitudinal direction of one embodiment, and FIG.
FIG. 3 is a cross-sectional view taken along a line XX in a direction transverse to the axis.

In FIG. 1, a winding unit 10 includes an annular collar 12 rotatably connected to a shaft 11 and a bearing 13 disposed around an outer peripheral surface of the collar 12.
Annular cover ring 14 rotatably supported via
And a piston member 15 disposed at a position corresponding to the collar 12 inside the shaft 11 and abutting on the collar 12 so as to be slidably contacted with the collar 12. As shown in FIG. 11 are arranged in the longitudinal direction.

As shown in FIG.
Locking portions 20 are provided at equal intervals in the circumferential direction on the outer peripheral surface side of the locking member 2.
2, a concave portion 24 having an inclined bottom surface 23 is provided, and a roller 25 is disposed in the concave portion 24.
Is movable in the circumferential direction of the collar 12 in the concave portion 24, and can be raised and lowered in the radial direction of the collar 12 by the roller 25 moving on the inclined bottom surface 23 of the concave portion 24. It is preferable that at least three locking portions 20 are provided at equal intervals in the circumferential direction.

The cover ring 14, which is rotatably disposed so as to cover the outer peripheral surface of the collar 12,
0 covers the entire width of the winding portion 10, the inner circumferences of both ends of the cover ring 14 are respectively supported on a shaft 11 via bearings 13, and the collar 12
Are located between the two bearings 13 (see FIG. 1). The cover ring 14 has a gap 26 into which the roller 25 is loosely fitted and can move together with the cover ring 14, and an opening through which a part of the roller 25 can project outward at the top of the gap 26. 27. The opening portion 27 is only opened to the extent that a part of the roller 25 projects, and the roller 25 does not fall out of the concave portion 24 through the gap portion 26.

The cover ring 14 is moved relatively to the collar 12 (relative movement when the roller 25 is made to protrude, and in FIG.
4 relative to the counterclockwise direction), the roller 25 loosely fitted in the gap 26 of the cover ring 14 moves on the inclined bottom surface 23 of the concave portion 24 provided on the outer peripheral surface of the collar 12. I do. When the roller 25 is located at the deep portion 21 of the concave portion 24, the top of the roller 25 does not project from the opening 27 of the cover ring 14, and the roller 25 is positioned at the shallow portion 22 of the concave portion 24. In such a case, the top of the roller 25 projects from the opening 27 of the cover ring 14 so as to abut on the inner peripheral surface of the core 50 mounted on the winding unit 10 to lock the core 50.

The winding core 50 to be mounted on the winding section 10 having the above structure.
Is disposed on the outer peripheral surface of the cover ring 14,
The outer peripheral surface of the cover ring 14 and the inner peripheral surface of the core 50 substantially match. When attaching and detaching the core 50, the core 5
A small gap L (for example, a gap of about 0.5 mm) is formed between the cover ring 14 and the core 50 so that the cover ring 14 can move in the axial direction. Are provided so as to come into surface contact with the inner peripheral surface of the core 50 at a wide portion. As a result, the winding unit 10
When the core 50 is attached to the
And rotate integrally as a result of frictional force due to surface contact.
The transmission of rotation from the shaft 11 will be described later.
In the initial stage of rotation of the winding unit 10, first, the shaft 11
At the time when starts to rotate in the winding direction, since the starting end of the narrow sheet is attached to the core 50, the core 50 and the cover ring 14 maintain their original positions without rotating,
The collar 12 rotates with the shaft 11 in the winding direction. Since the cover ring 14 relatively moves with respect to the rotating collar 12, the roller 25 that moves together with the cover ring 14 at each locking portion 20 is inclined by the concave portion 24 provided on the outer periphery of the collar 12. The bottom surface 23 is moved from the deep portion 21 to the shallow portion 22 and guided in a protruding direction, and the roller 25 protrudes so as to enter the wedge shape between the locking portion 20 and the inner peripheral surface of the core 50. The core 50 is constrained by the engagement and rotates together with the collar 12. On the other hand, the winding core 50 restrained by the winding unit 10
For example, the core 50 may be rotated in the release direction (clockwise in FIG. 2) with respect to the collar 12 in the rotation stopped state. And the rollers 25 are separated from the inner peripheral surface of the core 50, and each locking portion 20 releases the constraint of the core 50.

The shaft 11 is provided with an air introduction passage 30 along the center of rotation, and a vertical hole 31 penetrating from the air introduction passage 30 in the radial direction is arranged so as to correspond to each of the collars 12. Are arranged radially in four directions at equal intervals in the cross-sectional direction of the shaft 11 (for example, at an angle of 90 degrees as shown in FIG. 2), and in the longitudinal direction of the shaft 11, the width of the inner peripheral surface of one collar 12 is Two rows of vertical holes 31 are arranged side by side so as to fit inside. The two rows of vertical holes 31 are preferably displaced at an angle of 45 degrees in the cross-sectional direction of the shaft 11. And each of these vertical holes 31
The piston member 15 is movably fitted to the
A packing 32 is interposed between the outer periphery of the piston member 15 and the inner periphery of the vertical hole 31 so that air leakage does not occur.
As described above, the piston member 15 is movably arranged in the vertical hole 31, and further, since the vertical hole 31 communicates with the air introduction passage 30, a space extending from the air introduction passage 30 to the piston member 15. Is increased or decreased by an air pressure supply means (not shown) so that each winding unit 10
Can be moved in the radial direction. When the air pressure is increased, the piston member 15 moves in the protruding direction, and each of the piston members 15 slidably comes into contact with the inner peripheral surface of the collar 12, thereby restraining the collar 12 with respect to the shaft 11, The rotation of the shaft 11 causes the winding section 10 to rotate while causing the roller 25 to protrude. Note that the arrangement and number of the vertical holes 31 and the piston members 15 are not limited to the illustrated example, and any arrangement and number can be selected by the contact force.

FIG. 3 shows another embodiment, in which reference numeral 40 denotes an annular spring member wound around the winding section 10 in the circumferential direction. The spring member 40 is fitted into a mounting groove 41 provided near the center of the outer peripheral surface of the cover ring 14 and a mounting structure 42 provided near the outer peripheral center of each roller 25 so as to be continuous with the mounting groove 41. The roller 25 constantly applies a biasing force in a direction in which the roller 25 is immersed. When the roller 25 located at the lower portion of the winding unit 10 protrudes outward from the opening 27 of the cover ring 14 by its own weight when the winding unit 10 is stopped, it may hinder installation of a new winding core 50. However, the roller 25 is moved by the spring member 40 so that
Is held at a position where the core 50 is retracted from the center, so that a new core 50 can be mounted without any trouble.

In FIG. 3, reference numeral 45 denotes a pressing member comprising a spherical body 46 and a spring member 47. The pressing member 45 is provided on the outer peripheral surface of the cover ring 14, and the core mounted on the cover ring 14 is provided. The inner peripheral surface of the cover 50 is pressed to increase the frictional force between the core 50 and the cover ring 14 when the collar 12 starts rotating. By disposing the pressing member 45 in this manner, the core 50
The rotation resistance applied to the cover ring 14 can be effectively transmitted to the cover ring 14 and the collar 1
2 relative to each other, the relative movement of the roller 25 is reliably performed, and the core 50 is locked. The pressing members 45 may be provided at an arbitrary number on the outer peripheral surface of the cover ring 14 at arbitrary positions.

In order to wind up a slit narrow sheet using a sheet winding shaft having a plurality of winding units 10 having the above-described structure, a winding core 50 is attached to each of the winding units 10 and a required air pressure is applied. In addition, the piston member 15 is brought into contact with the collar 12 to support the collar 12 so as to rotate together with the shaft 11 in a state of slippage within an allowable range. Then, when the sheet winding shaft is rotated after the leading end of the narrow sheet is attached to each winding core 50 to impart rotational resistance, the collar 12 rotates together with the shaft 11, but the cover supported by the shaft 11 via the bearing 13. Since the ring 14 keeps its position due to the rotational resistance to which the leading end of the narrow sheet is attached, the roller 25 moves from the deep portion 21 of the concave portion 24 to the shallow portion 22 of the concave portion 24 at each locking portion 20 by the cover ring 14 which moves relatively. Roller 2
A part of the protrusion 5 projects from the opening 27 of the cover ring 14 and abuts on the inner peripheral surface of the core 50 in a contact state. As a result, the rotational force is transmitted from the collar 12 side, so that the core 50 also rotates, and winding starts. With the conventional sheet take-up shaft, the winding diameter of the sheet roll at each take-up section is different due to the effect of the thickness of the wide sheet not being uniform in the width direction during take-up, and the take-up tension is increased. Each will be different. However, in the present embodiment, the air pressure of the required pressure is applied to the sheet winding shaft to bring the piston member 15 into sliding contact with the collar 12.
The rotation speed is 5 to 5 times faster than the sheet feeding speed.
Make it about 15% faster. As a result, the collar 12 rotates while sliding to some extent with respect to the shaft 11. Therefore, if a winding tension greater than the assumed winding tension is applied to the narrow sheet, the collar 12
Of the piston member 15 with respect to the piston member 15 increases,
Excessive winding tension is not applied to the narrow sheet. Of course, if the winding tension applied to the narrow sheet becomes equal to or less than the assumed tension, the collar rotates in a state in which the degree of slippage of the collar is reduced. In this way, even if the winding diameter of the sheet roll in each winding section is different, the winding tension does not differ between the winding sections.

When the winding of the sheet winding shaft is stopped after the winding is completed, the shaft 11 is rotated in the reverse direction to move the roller 25 from the shallow portion 22 to the deep portion 21. And the lock of the core 50 is released. When the roller 25 moves to the shallow portion 22 of the concave portion 24 with the rotation of the shaft 11 and protrudes from the opening 27 of the cover ring 14 in the winding portion 10 where the core 50 is not mounted, For example, by manually rotating the cover ring 14 in the reverse direction, the roller 25 can be easily moved to the shallow portion 2.
2 to the deep portion 21 to move to the opening 2 of the covering 14.
7, and the cover ring 14 constitutes the outer peripheral portion of the winding portion 10 and is largely exposed as a whole. Can be easily applied.

[0021]

As described above, according to the present invention,
At the point where the winding core is attached to each winding section, the narrow sheet is stopped at the winding core, rotation resistance is given, and the sheet winding shaft starts rotating, the outer peripheral surface of the cover ring is in contact with the inner peripheral surface of the winding core. Since it is provided so as to be in surface contact with a wide portion, it is integrally rotated by frictional force, and slippage due to insufficient frictional force does not occur. Since the cover ring is supported by the shaft via a bearing, the collar and the cover ring move smoothly relative to each other, and the cover ring maintains its position with respect to the rotating collar. In the part, the roller moves in the recessed part together with the cover ring and is guided in the protruding direction, so that the core can be quickly locked. In addition, the provision of one covering ring with a smooth surface makes it possible to configure the entire outer peripheral portion of the winding portion, excluding the roller protruding portion, as a whole, which prevents problems such as an increase in frictional force due to accumulation of dust and the like. In addition to this, the number of parts can be reduced and the cost can be reduced. When the core is attached or detached, the roller is moved in the core locking direction or the core locking release direction by a simple operation of moving the core relative to the axis, thereby supporting and releasing the core. Is performed, and the core can be easily attached and detached manually. In addition, since the piston member comes into contact with the collar in a slidable state, if the tensile force applied to the narrow sheet changes during winding, the collar against the rotating shaft is changed. , The degree of slip changes, and the pulling force on the narrow sheet to be wound does not change.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a cross section of a sheet winding shaft according to the present invention in a direction transverse to the axis.

FIG. 2 is an explanatory diagram showing a cross section of a sheet winding shaft according to the present invention in a longitudinal direction of the shaft.

FIG. 3 is an explanatory view showing a spring member for applying a biasing force to a roller and a pressing member for pressing an inner peripheral surface of a winding core according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Winding part 11 ... Shaft 12 ... Collar 13 ... Bearing 14 ... Covering 15 ... Piston member 20 ... Locking part 23 ... Inclined bottom surface 24 ... Depressed part 25 ... Roller 27 ... Opening 31 ... Vertical hole 40 ... Spring member 45 ... Pressing member 50 ... Core

Claims (2)

[Claims] 1. A plurality of winding portions each having a collar rotatably coupled to a shaft are arranged in the longitudinal direction of the shaft, and a concave portion provided at an important portion of the collar on an outer peripheral surface side of the collar. A roller is disposed so as to be movable in the circumferential direction of the collar, and a cover ring is disposed rotatably on the outer peripheral surface of the collar. The cover ring has an opening through which a part of the roller can protrude outward and has an annular shape. An engaging portion is provided which is rotatably supported on a shaft via a bearing and enables the roller to protrude and retract from the opening of the cover ring in the radial direction of the collar by movement of the roller, and is mounted on the winding portion. A sheet take-up shaft configured such that a locking portion that guides the roller in the protruding direction when the shaft rotates is configured to be brought into contact with the winding core and locked, and a corresponding portion of the shaft with respect to the collar is provided. Air conduction along the longitudinal axis inside the shaft A plurality of vertical holes penetrating in the radial direction of the shaft so as to communicate with the path and face the inner peripheral surface of the collar are provided radially around the air introduction path, and a piston member is provided in each of the vertical holes. A sheet winding shaft movably disposed, wherein the piston member is slidably contacted with a collar by air pressure applied to an air introduction passage. 2. The sheet winding shaft according to claim 1, further comprising a spring member that applies a biasing force in a direction in which the roller is immersed in the roller.