JPH0582674B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of the Invention] The present invention relates to the winding of a predetermined length of magnetic tape from a product-width original magnetic tape to a small tape winding body, or the winding of a magnetic tape of a predetermined length onto a tape winding body once. When rewinding a wound magnetic tape onto another tape winding body, or when winding a magnetic tape in a wide range of states before making it into a raw tape, or when rewinding a magnetic tape in a wide range of states before making it into a raw tape, or when manufacturing multiple product widths from a tape raw roll that is wider than the product width. The present invention relates to a magnetic tape winding device for cutting and winding tape into raw tapes.

[Conventional technology]

In the manufacturing process of magnetic tapes such as audio cassette tapes, video cassette tapes, memory tapes, and broadcast video tapes, as an intermediate process, a long magnetic tape material is transformed into a small tape winding body such as a reel or hub. The process of winding a magnetic tape to a predetermined length, the re-winding process of rewinding the magnetic tape once wound onto a tape winding body to rewind it onto another tape winding body, and the tape width before the original roll. There is a winding process when the tape is wide, and a process where an original tape wider than the product width is cut into tape originals with multiple product widths and then wound.

When the magnetic tape is wound around the tape winding body in this winding process and rewinding process,
For example, depending on the physical properties of the original magnetic tape on the sending side, the physical properties of the tape wrapping on the winding side, or even the physical properties of the magnetic tape itself, vibrations in the tape thickness direction or in the width direction may occur during winding. The so-called tape behavior changes, such as the vibration of This results in irregular winding with uneven edges (edges). In particular, this tendency becomes stronger as the tape running speed during winding is faster.

A magnetic tape with such irregular windings, for example, when stored in a magnetic tape cassette, not only has poor appearance quality but also tends to cause uneven winding or damage to the tape ends, causing various problems. There are problems such as deterioration of electromagnetic conversion characteristics. Particularly in magnetic tapes for high-density recording, such as video tapes, where audio signals and tuning signals are recorded near the edges of the tape, the above-mentioned winding irregularities have been an extremely serious problem.

For this reason, in the conventional magnetic tape manufacturing process, after the winding process or rewinding process, a visual inspection, for example, is performed to check the appearance of all the tapes, which requires cost and time. was a major bottleneck in the magnetic tape manufacturing process.

In addition, in order to reduce this inspection load and to improve the winding appearance, conventionally, for example, when winding magnetic tape with a low yield of non-defective windings,
A method called decorative winding, as shown in the figure, is used.

7 and 8 are schematic perspective views showing the vicinity of the tape winding body 2 on the winding side. In the case of the one shown in FIG. 7, the rotating rollers 12, 13, 1
A flexible endless belt 11 made of, for example, rubber or polyimide, which is rotatably held by the magnetic tape T, elastically moves the magnetic surface of the tape in the radial direction of the tape wrapping body 2 while rotating together with the magnetic tape T. The configuration is such that the winding shape of the magnetic tape T is adjusted by pressing strongly. In the case shown in FIG. 8, a belt 15 made of relatively soft nonwoven fabric or the like is provided between one flange of the tape wrapping body 2 and the edge of the magnetic tape T. This belt 15 is wound on the belt feeding side 16 and is held by a rotating roller 17 etc. and is wound on the winding side 18 at a slow and constant speed. I try to press it relatively hard to keep the shape of the roll.

However, since both of the above structures are in direct contact with the magnetic tape T, for example, dropouts may occur due to shearing of the magnetic layer or falling off of nonwoven fabric fibers, tape deformation due to inappropriate pressing force, and damage to the tape edges. This caused various problems, and in some cases did not fulfill its original function. Furthermore, these decorative winding mechanisms themselves are subject to considerable wear and tear, and not only do they have problems in terms of cost and maintainability, but
When replacing the tape winding body 2, the structure must be such that the tape winding body 2 can be moved at least to a position where it acts and a position where it does not work, which complicates the winding device and requires a relatively long time to replace the tape winding body. If you are trying to improve productivity by spending a lot of time, the travel time will also be an obstacle to improving productivity.

Current cassette tape winding methods include an open winding method in which the tape is inserted into the cassette to complete the product after the above-mentioned decorative winding, and another method is to wind the magnetic tape at the final stage of the cassette assembly process. There is a method called in-cassette winding, C-0 winding, or V-0 winding.

In this method, as shown in FIGS. 9 and 10, all parts except the magnetic tape are assembled in advance in a cassette 23, and a tape winding body on the sending side and a tape winding body on the winding side are connected by a leader tape 10. The leader tape is pulled out and cut by a winding device called an in-cassette winder, and then wound around the leader tape on one side of the work (generally called V-0, C-0, etc.). The leading ends of the magnetic tapes to be removed are joined, the other leader tape is held by the suction member 22, and the tape winding body 2 on the joined side is rotated to wind and cut the magnetic tape T of a predetermined length. This is a cassette tape winding method in which the end of the wound magnetic tape T is finally joined to the other leader tape 10 to complete the product. In this in-cassette winding system, it is impossible for the tape winding body to mechanically contact the magnetic tape as described above, and the quality of the winding depends on the physical properties of the tape and variations in the cassette parts. It is completely uncontrollable, and the winding yield rate is extremely poor. In this case, in order to improve the winding appearance, a roller 24 having, for example, upper and lower ribs 25 is disposed at the entrance of the cassette, and force is applied in the width direction of the magnetic tape being wound up, so that the tape is pushed to one side. However, applying a strong force increases the risk of the edge of the tape being damaged by the brim 25, and a weak force has little effect on improving the roll shape. There was no way to improve the tape wrapping condition.

However, recently, as shown in Figure 11,
A side on which the magnetic tape T is wound around the winding drive shaft 30 which is detachably connected to the winding core 41 of a winding reel 40 constituted by a winding core 41 and a flange 42, with the flange 42 as a plane of symmetry. A magnetic tape winding device has been proposed in which at least one magnet 31 is arranged at a position symmetrical to the above, and the magnetic tape T is wound around the winding reel 40 (Japanese Patent Application Laid-open No. 1983-1991).
-51642).

However, as shown in FIG.
The magnet 31 provided around the magnet 31 has the following drawbacks.

The problem is that the winding appearance of the outer peripheral portion of the flange 42 is worse than that of the inner portion. This is because the outer diameter of the magnet 31 is approximately the same as the outer diameter of the flange 42, so the lines of magnetic force at the outer circumference of the magnet 31 are inclined, and the force that attracts the magnetic tape T toward the flange is weakened. Furthermore, if the outer diameter of the magnet 31 is increased in order to prevent this, there is a drawback in that equipment costs and space loss will increase.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and is capable of winding a magnetic tape without causing any disturbance in the winding shape when the tape is wound, even if the physical properties of the magnetic tape vary. The object of the present invention is to provide a magnetic tape winding device that can take up magnetic tape.

In addition, it is possible to eliminate the complexity of the winding device and the deterioration of tape quality due to the above-mentioned side effects, as in the above-mentioned decorative winding method that mechanically contacts the magnetic tape, and the tape winding process can be improved. An object of the present invention is to provide a magnetic tape winding device that can improve workability.

Furthermore, magnetic tape winding can dramatically improve the appearance of the in-cassette winding method, which conventionally had no way to improve the appearance of the tape, and the wide magnetic tape winding method used before the original tape. The purpose is to provide a device for collecting

[Structure of the Invention] The above-mentioned object of the present invention is to provide a magnetic tape winding device for winding a magnetic tape by rotating a tape winding body, the magnetic tape winding device being arranged along the rotating surface of the tape winding body so that the magnetic tape winding device rotates the tape winding body to wind the magnetic tape. a first magnet that generates a magnetic field in a direction, and a second magnet disposed so as to surround the outer periphery of the tape wrapping body in the radial direction, and both the first and second magnets have the same polarity on the tape wrapping body side. This is achieved by a magnetic tape winding device characterized in that it is configured to position the magnetic tape.

Hereinafter, embodiments of the device of the present invention will be described in detail.

1 and 2 are a schematic front view and a front view from the direction of arrow A of an embodiment of the magnetic tape winding device 1 of the present invention. This winding device 1 uses, for example, a method (open reel winding) in which the magnetic tape T is wound in advance around a pair of tape winding bodies 2 and 3 (hereinafter simply referred to as "tape reels") built into a video tape cassette. method) is used.

The general operation of the winding device 1 will be described below.
First, the tape reels 2 and 3 are connected by a leader tape 10 having a predetermined length (only half of one side is shown in FIG. 1), and the tape reels 2 and 3 are rotated by the winding device 1. Take drive shaft 4, 5
After being attached to the respective leader tapes 10
is cut approximately at the center, and the end on the tape reel 2 side and the tip of the magnetic tape original 6 that has been attached in advance are joined with a joining tape or the like. and,
After the magnetic tape T wound to a predetermined length on the tape reel 2 is cut, its end portion is joined to the leader tape 10 on one tape reel 3 side.

Note that the leader tape 10 and the magnetic tape T may be cut and the leader tape 10 and the magnetic tape T may be cut.
The joining is carried out by a cutting and joining means 9, which is provided with a holding member for the tape end, a cutting cutter, a joining tape, etc., and the magnetic tape T sent out from the original tape 6 is connected to a guide pin or a guide roller. The tape is wound onto the tape reel 2 through a path system 8 consisting of the following. Further, in FIG. 2, the cutting and joining means 9 has been omitted.

Within the above range, the device is similar to the conventional device, but the feature of the device of this embodiment is that the tape reel 2
It is in the mounting part. That is, the first permanent magnet 19a and the second permanent magnet 19 are arranged below and around the tape reel 2 on which the magnetic tape T is wound.
b is provided.

The first permanent magnet 19a has a disk shape with a center hole, for example, as shown in FIG. 3, and magnetic poles are located on the upper and lower surfaces of the disk. Therefore, the direction of the magnetic field of the first permanent magnet 19a is generally along the tape width direction (direction along the winding rotation axis 4).

As shown in FIG. 4, the second permanent magnet 19b has a substantially cylindrical shape with a notch 26, and is configured such that, for example, the N pole is located on the inner circumferential side and the S pole is located on the outer circumferential side. There is. Therefore, the direction of the magnetic field is generally along the radial direction of the tape reel 2. Note that the notch 26 is a part for securing a path for the magnetic tape T.

The relationship between the magnetic poles of the first permanent magnet 19a and the second permanent magnet is such that they are attached to the front panel 1a by support members 20a and 20b, respectively, so that the poles on the side facing the tape reel 2 have the same polarity. (See Figure 5). Since the second permanent magnet 19b is provided, the magnetic field of the first permanent magnet 19a has a higher magnetic flux density in the area where the tape reel 2 is provided, and its directionality is more stable in the tape width direction. It will be in line. The reason for this will be explained using FIG. 6.

If there is no second permanent magnet 19b, for example, the sixth
As shown in the figure, the lines of magnetic force ML of the magnet 19a show a normal form, but the second magnet 19b is brought closer to the reel rotation center from the radial direction of the region 2a where the tape reel 2 is provided. In this case, the magnetic poles of both magnets on the side facing the tape reel 2 are the same. As a result, the magnetic lines of force ML in the area 2a where the tape reel 2 is provided are compressed in the reel radial direction by the magnetic field of the second magnet, that is, in a flat state, and the magnetic flux in the reel radial direction is As the density increases, the entire tape becomes vertical along the width direction. Therefore, the magnetic field in the region 2a can be substantially strengthened and the directionality can be stabilized.

When the magnetic tape T is wound up with the winding device 1 configured as described above, the magnetic tape T is wound up so as to be biased toward the flange side on the first permanent magnet 19a side, which is extremely preferable because the tape edges are aligned. It becomes a roll. In particular, even on the outer peripheral portion of the reel where the tape behavior is unstable, a magnetic field with more stable directionality and higher magnetic flux density than before can be applied as described above, so that the winding appearance can be further improved.

In the above embodiment, the support members 20a, 2
Although the material of the magnets 0b is not particularly limited, if a ferromagnetic material such as a permalloy alloy containing iron, nickel, etc. is used for the supporting members 20a and 20b, the action of the magnets 19a and 19b is further enhanced. be able to.

In the above embodiment, the first and second magnets 19
Although both a and 19b are composed of one magnet, they do not necessarily have to be composed of one magnet, and may be an assembly of a plurality of magnets. Moreover, the first and second magnets 19a, 19
b is fixed to the front panel 1a by the support members 20a and 20b, but the present invention is not limited to this embodiment; for example, the tape reel 2
The tape reel 2 can also be easily attached and detached by moving in the direction along the winding rotation shaft 4 and waiting when the tape reel 2 is attached and detached.

The strength of the magnetic force of the first and second permanent magnets 19a, 19b is not particularly limited. It can be set in consideration of various conditions such as the distance between the tape T, the winding speed (tape running speed), and the influence of the magnetic field on the magnetic tape T.

Although the above embodiment describes an open-reel winding type winding device, the present invention is not limited to this type of winding device. It can also be applied to a winding method. In this case, the second embodiment of the above
Unlike the magnet 19b, it cannot be provided almost all around the tape reel, but it can be provided locally as appropriate, taking into consideration the shape of the cassette case.

In each of the above-mentioned winding devices, the magnet is connected to the winding rotating shaft 4
Although the present invention is not limited to this, for example, magnets may also be appropriately provided in the path system 8, which is the running path of the magnetic tape T, so that the magnets are provided only in the tape width direction. By applying magnetic force, the deflection of the magnetic tape T in the width direction may be suppressed to stabilize tape running performance.

Although permanent magnets are used as the magnets in the above embodiments, the present invention is not limited to this, and electromagnets can also be used. In this case, by changing the amount of current flowing through the electromagnet, the magnetic force of the electromagnet can be freely changed.

Note that the term magnet in this specification is not limited to the permanent magnets and electromagnets described in the above embodiments, but includes concepts such as a solenoid, and is a general term for magnetic field generating means.

The present invention is not limited to the embodiments shown above, and as mentioned at the beginning, for example, when a tape material wider than the product width is cut into tape material having multiple product widths and wound. It can also be applied to

〔Effect of the invention〕

As described above in detail, the winding device of the present invention is provided with a first magnet that attracts the magnetic tape to one side of the tape winding body (tape reel), and in the area where the tape winding body is located. A second magnet that generates another magnetic field that acts to increase the magnetic flux density of the magnetic field generated by the first magnet is provided around the tape winding body, so that the magnetic force acting on the magnetic tape is at least In the region near the outer circumference of the winding diameter, it becomes substantially stronger and more uniform. Therefore, the tape winding appearance can be improved more than ever.

Therefore, according to the present invention, it is possible to obtain a tape winding state in which the tape edges are not damaged and the magnetic surface is not damaged and the tape edges are aligned, and furthermore, it is possible to improve the productivity of the winding process. I can do it.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of an embodiment of the winding device of the present invention, FIG. 2 is a schematic side view thereof, FIGS. 3 and 4 are enlarged perspective views of the magnet of this embodiment, and FIG. Fig. 2 is an enlarged sectional view taken along the axial direction; Fig. 6 is an explanatory diagram showing the action of the magnet shown in Fig. 5;
8 and 8 are respectively schematic perspective views showing a part of a conventional winding device, FIG. 9 is a schematic plan view of a conventional winding device using an in-cassette winding method, and FIG. 10 is a main part of FIG. 9. FIG. 11 is a schematic sectional view showing a part of the conventional device. 1... Winding device, 1a... Front panel,
2, 3...Tape winding body (tape reel), 2a
... Area, 4, 5 ... Winding rotation axis, 6 ... Original fabric,
8... Pass system, 9... Cutting and joining means, 10... Leader tape, 11... Endless belt, 1
2, 13, 14, 17...rotating roller, 15...
Belt, 16...Belt sending side, 18...Belt winding side, 19a, 19b...Permanent magnet,
20a, 20b...support member, 21...motor,
22...Tape holding member, 23...Cassette case, 24...Roller, 25...Brim, 26...
Notch.

Claims (1)

[Scope of Claims] 1. In a magnetic tape winding device that rotates a tape winding body to wind a magnetic tape, a magnetic tape winding device is disposed along the rotating surface of the tape winding body and generates a magnetic field generally in the tape width direction. and a second magnet disposed so as to surround the outer periphery of the tape wrapping body in the radial direction, the first and second magnets having the same polarity on the side of the tape wrapping body. A magnetic tape winding device comprising: 2. The magnetic tape winding device according to claim 1, further comprising a ferromagnetic material provided in contact with or close to the first and second magnets.