JPH0668177U - Tape reel hub structure - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a tape reel that is simply configured and can wind a thin tape without distortion such as one-sided elongation. [Structure] A tape reel 1a includes a hub 2 that receives a rotational force from a drive shaft fitted from one side, a winding core 3 around which a tape is wound, and a tape guide surface 4a that guides the tape.
Is a synthetic resin molded product consisting of a flange 4 having
By forming the winding core 3 and the flange 4 separately, an intersection angle C is formed by the tape guide surface 4a of the flange 4 and the tape winding surface 3b forming the outer circumference of the winding core 3, and the winding core 3 is formed. Between the hub 2 and the hub 2, radial ribs 5 are provided so as to divide the tape winding surface 3b at the time of winding the tape within a predetermined span sufficient to keep the bending amount within a permissible range.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tape reel used for magnetic recording or the like and for winding a thin tape for high density recording or long length, and more particularly to a tape reel capable of winding a tape without deformation and damage.

[0002]

[Prior art]

 9 is a perspective view of a conventional tape reel main body, FIG. 10 is a sectional view of a hub portion of the same tape reel, FIG. 11 is an enlarged view of a main part of FIG. 10, and FIG. 12 is a perspective view of a conventional thick hub tape reel. FIG. 13 is a sectional view of a hub portion of an improved tape reel according to the related art.

As shown in FIG. 9, a conventional tape reel 10 for winding a tape, which is built in a video tape cassette or the like, is an integrally molded product made of a synthetic resin, which comprises a hub 11, a winding core 12 and a flange 13. Clamp insertion portion 12a for inserting a tape end fixing clamp is provided in the winding core 12 in a slit shape, and ribs 11a are radially provided between the hub 11 and the winding core 12. To do.

Since the winding core 12 of the tape reel 10 is in contact with the flange 13 of FIG. 10 having one end side at the center of which is the hub opening, the winding core 12 is a flange at the time of forming which acts in the direction of arrow F in the drawing. Due to the contraction of 13, uneven strain is generated, the outer diameter dimension A on the flange side becomes smaller than the dimension B on the other end side, and it becomes difficult to secure cylindricity with a predetermined accuracy. Therefore, when it is used for thin tape for high density recording or long length, the tape may be unevenly expanded and contracted and may be damaged by what is called wakame.

[0005] In the above, if the mold design is performed in consideration of the distortion due to the contraction of the flange 13, it is possible to obtain a predetermined cylindricity, but in that case, the mold design and the molding conditions corresponding to the molding conditions are obtained. Higher level of management is required, the shape of the clamp insertion part 12a of the winding core 12 and its mold are complicated, the mold design is restricted due to draft, the production conditions are complicated due to incompatible molds, or There are many problems that affect the manufacturing process of the mass production line, such as restrictions on the work of inserting the clamp when setting the tape end in the clamp insertion portion 12a.

In addition, the intersection C between the winding surface 12b of the winding core 12 and the tape guide surface 13a of the flange 13 that guides the tape to the winding surface 12b in FIG. Since it is difficult to secure an edge-shaped crossing angle due to shrinkage, the end of the winding surface 12b on the flange side does not form a cylindrical surface, and especially when used for thin tape with a thickness of 15 μm or less, one-sided elongation of the tape May cause

On the other hand, in the thick hub tape reel 14 of FIG. 12, the lower end of the winding core 12 is supported by the flange 13, and the tape winding surface 12b of the winding core 12 has ribs 15 arranged radially. The hub 11, the winding core 12, and the flange 13 are integrally supported by the hub 11.

Since the tape winding surface 12b of the winding core 12 of the tape reel 14 is deformed by the winding pressure of the tape, when it is used for a thin tape, the tape is non-uniformly stretched and deformed into a wakame shape. Sometimes. Therefore, it is necessary to increase the rigidity of the tape winding surface to ensure the roundness with a predetermined accuracy.

The improved tape reel 16 according to the prior art of FIG. 13 is provided with a disk-shaped disc rib 17 that supports the tape winding surface 12b over the entire circumference, thereby ensuring the roundness of the tape winding surface 12b. By constructing the winding core 12 having the disc-shaped rib 17 separately from the flange 13, the cylindricity of the winding surface 12b and the crossing angle between the winding surface 12b and the tape guide surface 13a on the flange side are ensured. It is possible (Japanese Utility Model Publication No. 63-36551).

[0010]

[Problems to be solved by the device]

 However, since the number of disk ribs of the core of the tape reel is limited to one due to restrictions on resin molding, it is necessary to have sufficient wall thickness to support the tape winding pressure applied to the winding surface, and therefore the resin molding. At this time, due to the contraction action of the thick portion of the disk-shaped rib, a dent is formed on the winding surface in contact with this rib. Since the tape deformation due to the partial depression of the winding surface is unavoidable, the applicable tape is limited, and in particular, the thin tape whose thickness is less than 15 μm cannot be applied.

An object of the present invention is to ensure the roundness and cylindricity of the winding core of the tape reel and the crossing angle between the winding surface of the winding core and the tape guide surface of the flange so that the tape is thin. The purpose is to obtain a resin tape reel that is compatible with.

[0012]

[Means for Solving the Problems]

 To solve the above problems, a hub that receives a rotational force from a drive shaft that is fitted from one side, a winding core that winds a tape supported by the hub, and the drive shaft of the tape that is wound around the winding core. In a resin tape reel consisting of a flange having a tape guide surface for guiding the edge on the entry side, the core of the tape reel and the flange are separately formed, and the tape guide surface of the flange is formed. Form a crossing angle with the tape winding surface of the winding core, and between the winding core and the hub, a predetermined span sufficient to keep the amount of bending of the tape winding surface during tape winding within the allowable range. A hub portion structure of a tape reel that is characterized by having radial ribs provided at positions that divide the inside.

[0013]

[Action]

 The tape winding surface of the core of the tape reel forms a separate body from the flange that gives uneven contraction force during resin molding, so it is molded into a cylindrical shape with a prescribed cylindricity without being subjected to uneven strain. At the same time, by dividing the winding core within a predetermined span and providing radial ribs between it and the hub to suppress the amount of bending of the tape winding surface during tape winding within the allowable range, the tape winding surface is The tape has a certain roundness against the tape winding pressure, and the crossing angle between the tape guide surface of the flange and the tape winding surface of the winding core prevents the tape from damaging the flange edge. It is wound around the tape winding surface of the winding core.

[0014]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view (a) and a sectional view (b) of a tape reel according to a first embodiment of the present invention, and FIGS. 2-8 are FIG. 1 (b) according to the second to eighth embodiments. It is a similar figure.

As shown in FIG. 1A, the tape reel 1a according to the first embodiment of the present invention includes a hub 2 that receives a rotational force from a drive shaft (not shown) that is fitted from one side (the lower side of the paper). A core 3 supported by the hub 2 for winding the tape, and a flange 4 having a tape guide surface 4a for guiding the edge of the tape wound around the core 3 on the approach side of the drive shaft. It is a synthetic resin molded product. A spline (not shown) for fitting drive is provided on the inner peripheral side of the hub 2. Reference numeral 3a is a clamp insertion portion for inserting a tape end fixing clamp.

In the tape reel 1a, the winding core 3 and the flange 4 are separately formed, and an intersection angle C between the tape guide surface 4a of the flange 4 and the tape winding surface 3b forming the outer circumference of the winding core 3 is set. A radial rib 5 is formed between the winding core 3 and the hub 2 and divides within a predetermined span sufficient to keep the amount of bending of the tape winding surface 3b during tape winding within an allowable range. Set up.

The rib 5 in FIG. 1A shows an example formed on the winding core 3 side, and may be formed on the hub 2 side depending on the situation.

The tape reel 1a has a hub 2 and a flange 4 integrated with each other, while a cylindrical core 3 has an inner peripheral side on which a so-called thin hub (made of polystyrene resin) for a general video tape cassette is formed. In the case of the core having an outer diameter of 26 mm and a wall thickness of 1.5 mm), ribs 5 are radially provided at a position divided by 8 except for the clamp insertion portion 3a. Held on the perimeter. By adjusting the radial length of the rib 5 to the outer diameter of the hub 2, the cylindricity of the winding core 3 is secured.

On the top surface of the hub 2 of FIG. 1B, a spring bearing 2a is provided so as to project, and a separate upper flange (not shown) is attached. The spring receiver 2a receives a reel spring that biases the tape reel 1a toward the opening of the hub 2. The spring force positions the tape reel 1a with the opening peripheral edge portion 2b of the hub 2 as a reference surface.

Since the tape winding surface 3b of the winding core 3 of the tape reel 1a configured in this manner is separate from the flange 4 which gives a biased contraction force at the time of resin molding, it does not receive a biased strain. A radial rib 5 is formed into a cylindrical shape having a predetermined cylindricity, and the winding core 3 is divided within a predetermined span so as to be interposed between the hub 2 and the tape. By suppressing the amount of bending of the surface within the allowable range, the tape winding surface 3b has a predetermined roundness against the tape winding pressure, and the tape guide surface 4a of the flange 4 and the winding core 3 are formed. The tape is wound around the tape winding surface of the winding core 3 without damaging the edge of the flange 4 side due to the angle of intersection with the tape winding surface 3b.

In this way, the winding core and the flange are formed separately, and the winding core and the hub are provided with radial ribs that divide the frequency within a predetermined span. Since the cylindricity and roundness of the tape are ensured, and the crossing angle is formed by the tape guide surface of the flange and the tape winding surface that forms the outer circumference of the winding core, the tape reel according to the present invention is a complicated reel. It can be used for thin tapes having a thickness of 10 to 15 μm without the need for a mold configuration.

The tape reel 1b according to the second embodiment of FIG. 2 is provided with a concentric groove 4b in the vicinity of the hub 2 on the tape guide surface 4a of the flange 4 of the first embodiment, and the groove 4b is wound in the above-mentioned manner. It is configured by fitting the end portion of the core 3.

The concentric groove 4b of the tape reel 1b can further improve the positioning accuracy of the winding core 3, the winding pressure resistance, and the roundness accuracy.

A tape reel 1c according to the third embodiment of FIG. 3 is an example in which the top surface of the winding core 3 of the first embodiment is closed to form a top surface 3c. The top surface 3c is provided with a spring receiver 3d. The roundness and winding pressure strength of the winding core 3 on the side of the top surface 3c are further improved by its reinforcing action.

In the tape reel 1d according to the fourth embodiment of FIG. 4, the ribs 5 formed on the winding core 3 of the first embodiment are halved, and the same number of ribs 6 are radially formed on the outer peripheral side of the hub 2. However, the ribs 5 and 6 are alternately meshed with each other.

In addition to the above, the clamp insertion portion is provided by an engagement configuration in which one rib on one side is sandwiched by two ribs on the other side from both sides and an engagement configuration between the clamp insertion portion on the core side and the rib on the hub side. It is possible to regulate the deformation of the winding core due to and secure the clamping force.

In the tape reel 1e according to the fifth embodiment of FIG. 5, the hub 3, the rib 5, and the core 3 are integrally resin-molded to form the core 3 and the flange 4 separately. It is an example in which the hub portion is formed and the hub portion is fitted into the center hole of the flange 4.

Since the hub portion has a shape of a substantially double cylinder with less uneven distribution of mass, it is possible to avoid uneven strain at the time of resin molding, and a high precision cylinder for the tape winding surface 3 b of the winding core 3. You can get a degree.

The tape reel 1f according to the sixth embodiment of FIG. 6 is fitted into the concentric groove 4b formed on the flange 4 at the end of the winding core 3 of the hub portion of the fifth embodiment described above, This is an example in which the same effects as those of the second embodiment are added.

The tape reel 1g according to the seventh embodiment of FIG. 7 is wound by connecting the lower ends of the hub 2 and the winding core 3 of the hub portion of the fifth embodiment with a ring-shaped lateral rib 7. This is an example in which the roundness and winding pressure strength on the lower end side of the core 3 are improved, and the flange 4 is held by the large diameter portion 3 c at the lower end of the winding core 3.

The tape reel 1h according to the eighth embodiment of FIG. 8 corresponds to the strength of the winding core 3 at the position where the lateral rib 7 of the hub portion of the seventh embodiment is not limited to the lower end portion of the winding core 3. In this example, the roundness is improved while supplementing the strength of the winding core 3. The lateral ribs 7 are formed to be thin enough to supplement the other radial ribs 5, so that the tape winding surface 3b of the winding core 3 is not affected by resin molding.

Between the core 3 and the flange 4, if necessary, if both are made of the same material, welding, adhesion by a solvent, or if they are made of different materials, a groove 2c is formed on the outer periphery of the hub 2. It is possible to integrally fix it by forcibly fitting the undercut portion and the flange 4.

As described above, the tape reel according to the present invention can improve the molding dimensional accuracy with a simple structure, and can be applied to thin tapes. In addition, it is possible to use the optimum resin material for each member as a separate resin molded product.

In the case of a thick hub tape reel, in each of the above-described embodiments, by forming a large-diameter hub that does not require dimensional accuracy and then providing ribs within a predetermined span, the same operational effect can be obtained. Can be obtained. For example, in the case of a core having an outer diameter of 62 mm and a wall thickness of 1.5 mm, or a POM (polyoxymethylene resin) core having an outer diameter of 44 mm and a wall thickness of 2.0 mm used for a commercial VTR, the frequency is divided by 12. With the rib, it is possible to deal with a thin magnetic tape having a thickness of 10 to 15 μm without causing damage such as unilateral stretching.

[0036]

[Effects of the Invention] By forming the core and the flange of the tape reel separately from each other in this way, uneven strain of the core formed by resin molding can be minimized, so that the cylindricity of the core can be reduced. Is secured.

Further, since the tape guide surface of the flange and the tape winding surface of the winding core, which are separate from each other, can be formed so as to intersect with each other, the tape winding surface has a cylindricity up to the end portion in contact with the flange. It

Further, the radial ribs provided between the core and the hub and dividing the frequency within a predetermined span suppress the amount of bending of the tape winding surface during tape winding within an allowable range. A certain roundness is ensured for.

Therefore, in the tape reel according to the present invention, the winding core and the flange are separately formed, and radial ribs for dividing the winding within a predetermined span are provided between the winding core and the hub. With this simple structure, it is possible to prevent damage to the edge of the tape reel flange side due to one-sided stretch and uneven bending and deformation of the tape, while allowing the tape to be wound without one-sided stretch. Play.

[Brief description of drawings]

FIG. 1 is a plan view (a) and a sectional view (b) of a tape reel according to a first embodiment of the present invention.

FIG. 2 is a view similar to FIG. 1 (b) according to a second embodiment.

FIG. 3 is a view similar to FIG. 1 (b) according to a third embodiment.

FIG. 4 is a view similar to FIG. 1 (b) according to a fourth embodiment.

FIG. 5 is a view similar to FIG. 1 (b) according to a fifth embodiment.

FIG. 6 is a view similar to FIG. 1B according to a sixth embodiment.

FIG. 7 is a view similar to FIG. 1 (b) according to a seventh embodiment.

FIG. 8 is a view similar to FIG. 1 (b) according to an eighth embodiment.

FIG. 9 is a perspective view of a conventional tape reel body.

FIG. 10 is a sectional view of a hub portion of a conventional tape reel.

11 is an enlarged view of a main part of FIG.

FIG. 12 is a perspective view of a conventional thick hub tape reel.

FIG. 13 is a sectional view of a hub portion of the improved tape reel according to the prior art.

[Explanation of symbols]

1a to 1h ... Tape reel, 2 ... Hub, 2a ... Spring receiver, 2b ... Peripheral part, 3 ... Winding core, 3a ... Clamp insertion part,
3b ... tape winding surface, 4 ... flange, 4a ... tape guide surface, 5 ... rib, C ... intersection angle.

Claims (1)

[Scope of utility model registration request] 1. A hub that receives a rotational force by a drive shaft fitted from one side, a winding core that is supported by the hub and winds a tape, and an edge of the tape wound around the winding core on the drive shaft entrance side. In a resin tape reel comprising a flange having a tape guide surface for guiding the tape reel, the winding core and the flange of the tape reel are separately formed, and the tape guiding surface of the flange and the tape winding surface of the winding core are formed. And form a crossing angle between the core and the hub, radially between the core and the hub at a position that divides the tape winding surface within a predetermined span sufficient to keep the amount of bending of the tape winding surface within the allowable range. A hub portion structure of a tape reel characterized in that a rib is provided.