JPH0580757B2 - - 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. Magnetic tape winding, such as when rewinding a wound magnetic tape onto another tape winding body, or when cutting and winding a tape roll that is wider than the product width into tape rolls with multiple product widths. METHODS AND APPARATUS.

(Prior art) 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 is transformed into small rolls such as reels and hubs. The process of winding a predetermined length of magnetic tape onto a tape winding body, the re-winding process of winding the magnetic tape once wound onto a tape winding body to rewind it onto another tape winding body, and the process of winding a magnetic tape of a predetermined length onto a tape winding body, This process involves cutting and winding a wider tape material into tape materials with multiple product widths.

When the magnetic tape is wound around the tape winding body in this winding process and rewinding process,
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 and width direction may occur during winding. The so-called tape behavior changes, and the winding state (winding state) of the wound magnetic tape
This problem occurs when the winding surface (edge of the tape) becomes uneven when observed from the axial direction of the tape-wrapped body. In particular, this tendency becomes stronger as the tape running speed during winding is faster.

A magnetic tape with such irregular winding, for example, when stored in a magnetic tape cassette, has poor appearance quality, is susceptible to damage to the tape edges, which can cause various troubles, and may cause problems with electromagnetic conversion characteristics. There are problems such as deterioration of Particularly in magnetic tapes for high-density recording, such as videos, for example, audio signals and tuning signals are recorded near the edges of the tape, so 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 and the rewinding process, a visual inspection is performed to check the appearance of all tapes. This was a major bottleneck in the tape manufacturing process.

In addition, in order to reduce this inspection load, in order to improve the winding appearance, in order to wind up magnetic tapes that have a low yield of good winding shapes, conventional methods such as those shown in Figs.
A method called decorative winding, as shown in the figure, is used.

5 and 6 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. 5, 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 presses the magnetic surface of the tape wrapping body 2 in the radial direction while rotating together with the magnetic tape T. , so that the winding appearance of the magnetic tape T is arranged. In the case shown in FIG. 6, a belt 15 made of relatively soft non-woven 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 around a rotating roller 17 on a belt feeding side 16.
While the tape is being held by the tape and being wound onto the winding side 18 at a slow and constant speed, one end edge of the tape is pressed to adjust the winding shape.

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 product is completed by inserting the tape into the cassette after the decorative winding, and another method in which the magnetic tape is wound 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. 7 and 8, 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.). Join the tip of the magnetic tape you are trying to remove,
The other leader tape is held by the suction member 22, the tape winding body 2 on the joined side is rotated, a predetermined length of magnetic tape T is wound and cut, and finally, the wound magnetic tape T This is a cassette tape winding method in which the end of the leader tape 10 is joined to the other leader tape 10 to complete the product.
With this in-cassette winding method, 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 low.
In this case, in order to improve the winding appearance, a roller 24 or the like having upper and lower ribs 25 is installed at the entrance of the cassette, and force is applied in the width direction of the magnetic tape as it is being wound up, causing the tape to move to one side. Attempts have been made to press the tape, but this has little effect on improving the tape winding condition, and currently there is no way to improve the tape winding condition.

(Object of the Invention) The present invention has been made in view of the above-mentioned circumstances. Even if the physical properties of the magnetic tape vary, the winding shape of the tape-wrapped body is disturbed when it is wound. It is an object of the present invention to provide a method and apparatus for performing a winding operation without causing any damage.

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 method and device that can improve workability.

Furthermore, it is an object of the present invention to provide a magnetic tape winding method and device that can dramatically improve the winding appearance of the in-cassette winding method, for which conventionally there was no way to improve the winding appearance. It is.

(Structure of the Invention) The above object of the present invention is to wind a magnetic tape by applying a magnetic field inclined in a generally conical shape around the rotational axis of the tape winding body when winding the magnetic tape onto a tape winding body. A magnetic tape winding method and an apparatus implementing the method, that is, a magnetic tape winding device that winds a magnetic tape by rotating a tape winding body, wherein This is achieved by a magnetic tape winding device characterized in that it includes at least one pair of magnets that generate a generally conically inclined magnetic field.

Hereinafter, embodiments of an apparatus implementing the method of the present invention will be described in detail.

1 and 2 are a schematic front view and a side 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 includes, for example, a pair of tape winding bodies 2 and 3 (hereinafter simply referred to as "tape reels") built into a video tape cassette.
This method is used in a method in which a magnetic tape T is wound in advance and then incorporated into the magnetic tape.

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 a shaft that is rotationally driven in the winding device 1 is connected. 4 and 5, the leader tape 10 is cut at approximately 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. Ru. After the magnetic tape T wound around the tape reel 2 to a predetermined length is cut, the end portion thereof 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 spring system 8 consisting of, etc. 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 the present invention is that the tape reel 2
It's in the mounting part. That is, a pair of permanent magnets 19 are provided, for example, held by respective support members 20 so as to sandwich the tape reel 2 that winds up the magnetic tape T. This permanent magnet 19 is provided on the lower side of the reel (on the right side in the figure) so as to surround the shaft 4 connected to a drive means (not shown). The opposing surface 19b of the opposing surface 19a provided above the reel is relatively small, and both opposing surfaces 19a and 19b are parallel and have the same polarity, for example, N poles. And, as shown in Figure 3,
The tape reel 2 is configured to be under the influence of the magnetic field of the opposing surface 19a. In other words, the lines of magnetic force passing through the tape reel 2 (the lines of magnetic force shown by the dashed line in the figure)
ML) is influenced by the magnetic force of the permanent magnet 19 provided above the reel (on the left side in the figure), and takes on a generally conical shape around the axis of rotation of the tape reel 4.

The strength of the magnetic force of the permanent magnet 19 is not particularly limited; for example, the strength of the magnetic force of the permanent magnet 19 is determined by the tape tension at the time of winding, the type of magnetic tape T, the distance between the magnet 19 and the magnetic tape T, the winding speed (tape It can be set in consideration of various conditions such as running speed) and the influence of the magnetic field on the magnetic tape T. Further, the spread angle of the lines of magnetic force ML emerging from the opposing surface 19a can be freely adjusted by, for example, the force relationship of the opposing magnetic forces or by making the magnet movable along the reel rotation axis.

With the winding section configured in this way, the magnetic tape T
When the magnetic tape T is wound up, it is pulled by the permanent magnet 19 on the lower side of the reel and wound so that one edge of the tape contacts the lower flange. Also, between the wound tapes,
The attraction force in the tape thickness direction acts, increasing the frictional force between the tapes, and it is possible to effectively suppress the deviation in the tape width direction.
The tape itself is held in a stable state by the force of the magnetic field as a whole. In other words, a biasing force can be applied to the magnetic tape T coated with a magnetic material by the magnetic field without contacting the tape T. As a result, the magnetic tape T is wound in an extremely favorable state without any winding deviation in the tape width direction. In particular, when the magnetic tape T is wound up at a high speed, air is also wound up along with the tape T, creating an air layer between the magnetic tape T that has already been wound, and the magnetic tape T being wound up in the tape width direction. Since it is in a state where it is extremely easy to move, the edges of the tape can be easily aligned by the magnetic force of the magnet 19.

In the embodiment described above, the opposing surfaces 19a and 19b of the permanent magnet 19 are configured to have the same polarity, but the present invention is not limited to this, and as shown in FIG. It's okay. In the case shown in FIG. 4, the lines of magnetic force ML are inclined so as to converge on the smaller side of the opposing surface. In addition, in FIG. 4, the magnetic tape T is shown to be wound so as to come into contact with the upper flange of the tape reel 2 (on the left side in the figure), but in this embodiment, the magnetic tape T is wound on either side of both flanges. It can be pushed to one side. That is,
The flange side to which the permanent magnets 19 are biased can be freely adjusted depending on, for example, the strength of the magnetic field and the positional relationship of the opposing permanent magnets 19.

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.

Further, in the above embodiments, an open-reel type winding device has been described, but the present invention is of course applicable to other types of winding devices, such as an in-cassette type winding device. Furthermore, the present invention is not limited to the above-described embodiments, and can of course be applied to an apparatus that cuts and winds a tape material having a plurality of product widths from a tape material wider than the product width, for example.

(Effects of the Invention) As described in detail above, when winding a magnetic tape as in the present invention, by applying magnetic force to the magnetic tape at an angle with respect to the width direction using a magnetic field, the tape width can be increased. The tape running is extremely stable due to the directional force and the mutually attracting force between the tapes (in the tape thickness direction), so that the edges of the wound magnetic tape are aligned and are in a very favorable winding state. Furthermore, since the present invention uses a non-contact method to apply a force that improves the winding state (winding shape) of the magnetic tape, it is possible to prevent the tape from bending, damaging the edges of the tape, or damaging the magnetic surface due to contact, unlike conventional methods. The quality of the magnetic tape can be improved without causing such troubles. Further, the winding device according to the present invention has an extremely large effect in that the means for adjusting the tape winding state does not become complicated.

Therefore, according to the present invention, it is possible to improve the quality of the magnetic tape and the productivity of the winding process. In particular, it is possible to provide a dramatically improved method and device for a winding device that employs an in-casset winding system.

[Brief explanation of the drawing]

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, and FIG.
FIG. 4 is a schematic enlarged sectional view of the main part taken along the axial direction of the figure, FIG. 4 is a schematic sectional view of the main part showing another aspect of the present invention, and FIGS. FIG. 7 is a schematic plan view of a conventional winding device using an in-cassette winding method, and FIG. 8 is an enlarged side view of the main part of FIG. DESCRIPTION OF SYMBOLS 1... Winding device, 2, 3... Tape winding body (tape reel) 4, 5... Shaft, 6... Original fabric, 8... Pass system, 9
... Cutting and joining means, 11 ... Endless belt, 1
2, 13, 14, 17...Rotating roller, 15...Belt, 16...Belt sending side, 18...Belt winding side, 19...Permanent magnet, 19a, 19b...Opposing surface, 20...Supporting part, 21...Driving means, 22...Adsorption member, 23...Cassette, 24...Roller, 25...Brim.

Claims (1)

[Scope of Claims] 1. A magnetic field characterized in that when winding a magnetic tape around a tape winding body, a magnetic field is applied to the tape winding body, and the tape winding body is wound by applying a magnetic field inclined in a generally conical shape around the rotational axis of the tape winding body. Tape winding method. 2. A magnetic tape winding device that winds a magnetic tape by rotating a tape winding body, comprising at least one pair of magnets that generate a magnetic field that is inclined approximately conically around the rotational axis of the tape winding body. A magnetic tape winding device characterized by: 3. The magnetic tape winding device according to claim 2, wherein a pair of said magnets having opposing surfaces of different sizes are provided facing each other on the upper and lower sides of said tape winding body. 4. The magnetic tape winding device according to claim 2 or 3, wherein opposing poles of the magnets are different. 5. The magnetic tape winding device according to claim 2 or 3, wherein opposing poles of the magnets are the same.