JP2003054844A - Tape winding shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent detects such that a trace on a tape is generated by a clearance formed on an outer circumference of a leaf type tape winding shaft, and that a winding rate can not be increased by a bound in winding a tape. SOLUTION: The tape winding shaft is provided with a drum, a first leaf fixed or movable with respect to the drum and a second leaf movable with respect to the drum on an outer side of the drum, and an expansion body arranged in the drum for enlarging and opening the leaf, and forms a large diameter shaft with no clearance on the outer circumference by cooperation of the first leaf and the second leaf when the expansion body expands. One first leaf and a pair of second leaves adjacent to the first leaf are provided. A point of support, where the second leaves abut on an inner surface of the drum on an opposite side to the first leaf, is formed, and an inclining surface, where the point of support and an end part on an opposite side abut when the second leaf rotates around the point of support and is enlarged and opened, is provided on an end part of the first leaf.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a mandrel when winding a raw material (hereinafter referred to as a tape) such as a tape, a band-shaped film, a band-shaped sheet, etc., and can be taken out from a winding tape after winding the tape. And a tape winding shaft.

[0002]

2. Description of the Related Art FIG. 5 is a schematic vertical sectional view showing a state in which a tape 2 is started to be wound on a tape winding shaft (air shaft) 1 called a leaf type. 4, the moving leaf 4 and the drum 3 for expanding the moving leaf 4 to the maximum diameter D1 shown in the figure.
A lug 4a, which is provided with an expander 5 disposed inside and is integral with the movable leaf 4, is fixed to a lug receiver 4b through an elongated through hole 6 (elongated in the direction perpendicular to the paper surface) formed in the drum 3. Since pressurized air is supplied into the expander 5, the lug receiver 4b is moving radially outward until it abuts against the inner surface of the drum 3, and the moving leaf 4 is of a return spring mechanism (not shown). It protrudes outward against the elasticity and a gap 7 of, for example, 10 mm is formed between the adjacent leaves 4 and 4. The tape winding shaft 1 is placed on, for example, driving rolls 8 and 9 having a diameter of 300 mm, and the tack of the tip of the tape 2 wound around the outer circumference of the tape winding shaft 1 from the lower side of the roll 8 by hand before starting the roll. After the (folded portion) is caught between the roll 8 and the tape winding shaft 1 from above the roll 9, both rolls 8 and 9 are rotated in the arrow direction. When the winding tape reaches a predetermined size such as 2a, the driving rolls 8 and 9 are stopped, the tape 2 at the end of winding is cut, the pressurized air in the expander 5 is released, and the shaft 1 is reduced to the minimum diameter D2. Then, it is pulled out from the winding tape 2a. As the prior art, there is Japanese Utility Model Publication No. 5-37977 of the present applicant.

However, due to the fact that the diameter is expanded to the maximum diameter D1 when the tape is wound, a gap 7 is unavoidable between the adjacent leaves 4 and 4, and the presence of the gap 7 causes the winding tape 2a to have a gap. The tape 2 at the winding start portion has a trace shape, and this tendency becomes more prominent as it approaches the outer peripheral surface of the shaft 1, and the quality of the wound product (tape) deteriorates. Also, the drive roll 8,
Bounce occurs when the gap 7 passes over 9 and uneven tension is applied to the tape 2, the quality of the tape tends to vary, and the end surface of the winding tape perpendicular to the shaft is not aligned in the surface position. There is a risk that the winding shape will be reduced due to, and it will not be able to separate, especially when taking multiple strips. The tape may be wrinkled, and the tape is 50-100 r. p. m. Then, there is no problem, but 200 to 300 r.p.m. p. m. Operations in the are almost impossible.

[0004]

A gap 7 formed on the outer circumference of a leaf type tape winding shaft when winding a tape.
The purpose is to improve so as to avoid the occurrence of traces on the tape and the problem that the winding speed cannot be increased due to bouncing.

[0005]

According to a first aspect of the present invention, a drum, a first leaf and a movable second leaf that are fixed or movable outside the drum, and an inside of the drum for expanding the leaf are provided. And a first leaf and a second leaf cooperate with each other to form a large-diameter shaft with no gap on the outer circumference when the expansion body is expanded.
It is a tape winding shaft.

According to the invention of claim 2, one first leaf,
A pair of second leaves adjacent to the first leaf, the second
The leaf forms a fulcrum that abuts against the inner surface of the drum on the side opposite to the first leaf, and when the second leaf expands while rotating around the fulcrum, the slope on the side opposite the fulcrum abuts against the slope. The tape winding shaft according to claim 1, which is provided at one leaf end.

The invention of claim 3 is at least a pair of first
A leaf and at least a pair of second adjoining first leaf
The tape take-up shaft according to claim 1, further comprising a leaf, wherein the slope of the second leaf that abuts both ends of the second leaf when the second leaf is expanded is provided at the end of the first leaf.

[0008]

1 and 2 showing an embodiment of claims 1 and 2, FIG. 1 is a time of reduction and FIG. 2 is a time of enlargement. The first leaf 14 of FIG. 1 is fastened to the lug receiver 14b via the lug 14a, and is integrated with the drum 3 in the embodiment shown by the solid line. However, by providing the lug receiver 14b with the steal portion 16 (radial thickness: L3) along the inner surface of the drum 3, it is possible to allow only L3 to project outward in the radial direction when the inflatable body 5 is inflated. it can. First leaf 14
Is the lug 17 of the second leaf 17, 17 at both ends in the circumferential direction.
It has slopes 18 and 19 substantially parallel to the center lines O1 and O2 of a.

The second leaf 17 is fastened to the lug receiver 17b via the lug 17a, and the lug 17a passes through the center of the through hole 20 having a larger width in the circumferential direction of the shaft than the lug 17a. L4 is left on both sides.
The lug receiver 17b is a point P on the outermost portion farthest from the lug 14a.
In No. 1, the inner surface of the drum 3 faces the inner surface of the drum 3 with an abutment or a slight clearance, and as it goes to the lug 14a side, it is separated from the inner surface of the drum, and the maximum backlash is L5. The inner surface of the second leaf 17 is in contact with the outer surface of the drum 3 at the central portion in the circumferential direction in the vicinity of the lug 17a, but is separated from the outer surface of the drum 3 up to L6 along with the distance. Also, the second
Both ends of the leaves 17 and 17 farthest from the first leaf 14 face each other with a slight gap L7 therebetween, and the slopes 21 and 22 at the ends on the side of the first leaf 14 are different from the slopes 18 and 19. The shaft is inclined so as to move away from it toward the center of the shaft, and occupies a position on the center side by rattling L8 with respect to the outer surface of the first leaf 14.

When pressurized air is supplied to the inside of the expander 5, the outer surface of the expander 5 pushes the lug receiver 17b outward in the radial direction, and the point P1 abuts against the inner surface of the drum 3, which serves as a fulcrum. As a result, the unit of the second leaf 17 rotates in the X1 and X2 directions, and as shown in FIG. 2, L7 of FIG. 1 becomes 0 or substantially 0, and at the same time, the slopes 21 and 22 collide with the slopes 18 and 19. As a result, the clearance (gauge L12) in the circumferential direction becomes 0, and the clearance L8 also becomes 0 or substantially 0, so that the large-diameter shaft 11 having a smooth cylindrical surface with no gap in the circumferential direction is obtained.

In FIGS. 3 and 4 showing the embodiments of claims 1 and 3, FIG. 3 is at the time of reduction and FIG. 4 is at the time of enlargement. In FIG. 3, L9 and L10 are provided between the first leaf 14 and the drum 3 and between the drum 3 and the lug receiver 14b, respectively, and the slopes 18 and 19 at both ends of the first leaf 14 are the second The lug 25a of the leaf 25 is inclined so as to approach the centerline O3 of the lug 25a as it goes radially outward. The slopes 26, 27 of the second leaf 25 are parallel to the slopes 18, 19. A large rattle L11 is provided between the lug receiver 25b and the inner surface of the drum 3.

When pressurized air is supplied into the expander 5, the outer surface of the expander 5 presses the lug receivers 14b and 25b outward in the radial direction as shown in FIG. 4, and rattles L10 and L11 become zero. At this time, the slopes 26 and 27 collide with the radially outer ends of the slopes 18 and 19 to complete a perfect circle having no gap on the outer circumference.

It is to be noted that L7 and L12, which correspond to the circumferential gap in FIG. 2 at the time of enlargement, are preferably 0, but they cause negligible traces and bounds on the tape, which is 0.
It does not matter if the value is very close to. Further, by providing the rattle 16 of FIG. 1, the minimum diameter can be reduced and the shaft can be easily removed.

[0014]

According to the first aspect of the present invention, even if it is a leaf type, there is no possibility that traces will be formed on the tape to be wound, and the occurrence of bounce can be effectively avoided. Therefore, the winding speed can be increased. The advantage that efficiency can be improved arises.

According to the second aspect of the present invention, since the second leaf 17 (FIG. 1) rotates in the X1 and X2 directions during the expansion, it is easy to surely reduce the circumferential clearance to zero.

According to the invention of claim 3, the slope 1 of FIG.
Due to the action of Nos. 8 and 19 and the slopes 26 and 27, the clearance on the circumference can be easily reduced to zero.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a tape winding shaft according to the present invention when it is reduced.

FIG. 2 is a cross-sectional view of the tape winding shaft of FIG. 1 when enlarged.

FIG. 3 is a sectional view at the time of reduction in another embodiment.

FIG. 4 is a cross-sectional view of the tape winding shaft shown in FIG. 3 when it is enlarged.

FIG. 5 is a schematic vertical sectional view of a conventional structure.

[Explanation of symbols]

3 drums 5 Inflatable body 7 gap 11 shaft 14 First Leaf 17 Second Leaf 18, 19 slope 25 Second Leaf P1 point (fulcrum)

Claims (3)

[Claims] 1. An expander comprising: a drum; a first leaf that is fixed or movable outside the drum; and a movable second leaf; and an expander that is disposed in the drum to expand the leaf. A tape winding shaft, characterized in that when the body expands, the first leaf and the second leaf cooperate with each other to form a large diameter shaft having no gap on the outer circumference. 2. A first leaf and a pair of second leaves adjacent to the first leaf, the second leaf forming a fulcrum that abuts the inner surface of the drum on the side opposite to the first leaf. , Second
The tape take-up shaft according to claim 1, wherein the first leaf end portion is provided with an inclined surface where an end portion opposite to the fulcrum abuts when the leaf expands while rotating around the fulcrum. 3. At least one pair of first leaves and at least one pair of second leaves adjacent to the first leaves,
The tape winding shaft according to claim 1, wherein an inclined surface where both ends of the second leaf abut against each other when the second leaf is expanded is provided at an end of the first leaf.