JPS62180574A - Method and device for taking up magnetic tape - Google Patents

Abstract

PURPOSE:To obtain a method and a device that executes a take-up operation without causing disturbance in the shape of winding at the time of taking up by taking up a magnetic tape applying a magnetic field inclined in conical face form around the rotary axial line of a tape winding body. CONSTITUTION:A permanent magnet 19 provided so as to clamp a tape reel 2 that takes up a magnetic tape T is constituted so that the part in lower side of the reel clamps a shaft 4 in doughnut shape in an opposite face 19a equal to or larger than the radius of the reel. The opposing face 19b of the upper side of the reel is constituted relatively small, and opposing faces 19a, 19b are parallel to each other, and made to the same pole, for instance N pole. Magnetic force lines that pass the tape reel 2 become nearly conical around the rotary axial line of the tape reel 2 by being influenced by the permanent magnet 19 in the upper part of the reel. The magnetic tape T is attracted by the permanent magnet 19 in the lower part of the reel and rolled in with the edge of the tape while contacting the lower side flange. Thus, the tape is taken up in good condition free from deviation in winding in the transverse direction of the tape.

Description

Detailed Description of the Invention (Field of the Invention) The present invention relates to winding a predetermined length of magnetic tape from an original magnetic tape onto a small tape winding body, or to The present invention relates to a magnetic tape winding method and apparatus for rewinding a tape onto another tape winding body.

(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, small rolls such as reels and hubs are processed from a long magnetic tape raw material. There is a process of winding a predetermined length of magnetic tape around a tape winding body, and a rewinding process of winding the magnetic tape once wound onto a tape winding body so as to rewind it onto another tape winding body.

When the magnetic tape is wound onto the tape winding body in this winding process and rewinding process, the physical properties of the magnetic tape original on the feeding side or the properties of the tape winding body on the winding side are Depending on the physical properties and even the physical properties of the magnetic tape itself, the so-called tape behavior may change during winding, such as vibration in the tape thickness direction or width direction, resulting in changes in the winding shape of the wound magnetic tape. This problem occurs in the winding state, that is, the tape winding is disordered in that the face (tape edge) becomes uneven when observed from the axial direction of the tape wrapping. In particular, this tendency becomes stronger as the tape running speed during winding increases.

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 In magnetic tapes for video, for example, in which recording is performed at a high density of 1.5%, 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 rewinding process, a visual inspection, for example, is performed to check the appearance of all the rolls, which requires cost and time. was a major bottleneck in the magnetic tape manufacturing process.

In addition, in order to reduce the inspection load and to improve the appearance of the winding tape, a conventional method of winding magnetic tape with a low yield of non-defective winding tapes has been used, for example, a method called decorative winding as shown in Figs. 5 and 7. has been adopted.

5 and 6 are schematic perspective views showing the vicinity of the tape winding body 2 on the winding side. In the case shown in FIG. 5, a flexible endless belt 11 made of, for example, rubber or polyimide, which is rotatably held by rotating rollers 12, 13, 14, rotates together with the magnetic tape T and wraps the tape wrapping body 2. It is configured to elastically press the tape magnetic surface in the radial direction to adjust the winding shape of the magnetic tape T. In the case of the one shown in FIG. 6, a belt 15 made of relatively soft non-woven fabric or the like is provided between one of the seven lunges 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 to adjust the shape of the roll.

However, since both of the above structures are in direct contact with the magnetic tape T, for example, dropouts occur due to the magnetic layer being scratched or nonwoven fabric fibers falling off, tape deformation due to inappropriate pressing force, and damage to the tape edges. This caused various problems such as, in some cases, it did not perform its original function. Furthermore, these decorative winding mechanisms are not only subject to high wear and tear, but also have problems in terms of cost and maintainability. In order to improve productivity, the winding device must be complicated and it takes a relatively long time to replace the tape winding body. This is a hindrance.

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 used in the final stage of the cassette assembly process. The so-called in-casset winding or C-0 winding, v
There is a method called -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. After the leader tape is pulled out and cut by a winding device called an in-cassette winder, the leader tape on one side of the workpiece (generally referred to as vo, c-a, etc.) after the body has been inserted and the screws have been tightened is cut. The leading ends of the magnetic tape to be wound are joined together, 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 up a predetermined length of magnetic tape T. This is a cassette tape winding method in which the tape is cut and finally the end of the wound magnetic tape T is 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 low. In this case, a row 224 with upper and lower ribs 25 at the entrance of the cassette is used to improve the winding appearance.
Attempts have been made to press the tape to one side by applying force in the width direction of the magnetic tape as it is being wound up, but this method has rarely been effective in improving the winding appearance. Currently, there is no way to improve the tape winding condition.

(Object of the Invention) The present invention has been developed in view of the above circumstances, and it is possible to prevent disturbances in the winding shape of a tape-wrapped body even when the physical properties of the magnetic tape vary. It is an object of the present invention to provide a method and apparatus for performing a winding operation without causing any curling.

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 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, which has hitherto been difficult to improve the winding appearance. That 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 R1 of the present invention. This winding device 1 is used, for example, in a method in which a pair of tape winding bodies 2 and 3 (hereinafter simply referred to as "tape reels"), which are housed in a video tape cassette (K), are wound in advance and then assembled. It is something that can be done.

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 approximately at the center, and the end on the tape reel 2 side and the tip of the magnetic tape material B which was previously attached 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 cutting of the leader tape 10 and the magnetic tape T and the joining of the leader tape 10 and the magnetic tape T are performed by a cutting and joining means 9 that is provided with a holding member for the tape end, a cutting cutter, a joining tape, etc. The magnetic tape T fed out from the original tape 6 is wound onto the tape reel 2 through a bus system 8 consisting of guide pins, guide rollers, etc. Also, in FIG. 2, the cutting and joining means 9 has been omitted.

Although the device is similar to the conventional device within the above-mentioned range, the feature of the device of the present invention lies in the mounting portion of the tape reel 2. That is, the tape reel 2 that winds the magnetic tape T
A pair of permanent magnets 19 are provided, for example, held by respective support members 20 so as to sandwich the two. 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). Opposing surface 19alC is configured,
The opposing surface 191) of the reel provided on the upper side of the reel is relatively small, and both opposing surfaces 19a and 19b are parallel and have the same polarity, for example, N@. As shown in FIG. 3, the tape reel 2 is configured to be under the influence of the magnetic field of the opposing surface 19a. That is, the lines of magnetic force passing through the tape reel 2 (lines of magnetic force ML indicated by dashed lines in the figure) are connected to the permanent magnet 19 provided above the reel (on the left side in the figure).
Under the influence of the magnetic force of the tape reel 4, the tape reel 4 takes on a generally conical shape around the rotational axis of the tape reel 4.

Note that the strength of the magnetic force of the permanent magnet 19 is not particularly limited, and may vary depending on, for example, 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,
It can be set in consideration of various conditions such as the winding speed (tape 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.

When the magnetic tape T is wound up with the winding portion configured in this way, the magnetic tape T is pulled by the permanent magnet 19 on the lower side of the reel, and one edge of the tape is brought into contact with the lower 7 langes. I get caught up in it. In addition, the pulling force in the tape thickness direction acts between the wound tapes, increasing the frictional force between the tapes and effectively suppressing the deviation in the tape width direction.
The tape itself is held stable 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
The tape is rolled up in an extremely favorable condition without any winding deviation in the tape width direction. In particular, when the magnetic tape T is wound up at high speed, air is also wound up with the tape T, and an air layer is formed between the magnetic tape T that has already been wound, and the magnetic tape T that is being wound up has a tape width. Since the button is extremely movable in the direction, the edges of the tape can be easily aligned by the magnetic force of the magnet 19.

In the above embodiment, both opposing surfaces 19a of the permanent magnet 190
, 19b are configured to have the same polarity, but the present invention is not limited to this, and may be configured to have different polarities facing each other as shown in FIG. In the case shown in FIG. 4, the lines of magnetic force ML are inclined so as to converge on the smaller opposing surface. Also, the fourth
In the figure, the magnetic tape T is placed above the tape reel 2 (left 1 in the figure).
111) is shown so that it is wound on one side so as to be in contact with the 7 lunge, but in the case of this embodiment, it can be wound on either side of both 7 arms/ji. That is, depending on, for example, the strength of the magnetic field and the positional relationship of the opposing permanent magnets 19,
You can freely adjust which flange side it should be biased towards.

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.

Furthermore, although the above embodiments have been described with respect to an O-eel type winding bag*, it goes without saying that the present invention can also be applied to winding devices of other types, such as an in-cassette winding type.

(Effects of the Invention) As described in detail above, when winding a magnetic tape as in the present invention, when a magnetic field is used to apply a magnetic force inclined to the width direction of the magnetic tape, the tape The tape running is extremely stable due to the force in the width direction and the force that attracts the tapes to each other (in the tape thickness direction), so the edges of the wound magnetic tape are aligned and the winding state is very favorable. Ru. 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, a method and device 4 that are dramatically advanced can be provided in a winding device that employs an in-cassette winding system.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a part 7111i aspect of the winding device of the present invention, FIG. 2 is a schematic side view thereof, and FIG. 3 is a schematic enlarged sectional view of the main part taken along the axial direction of FIG. 2. , FIG. 4 is a schematic sectional view of main parts showing another aspect of the present invention, FIGS. 5 and 6 are schematic perspective views showing a part of a conventional winding device, and FIG. 7 is an in-cassette winding device. FIG. 8 is a schematic plan view of a conventional winding device according to the 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 Joining means, 11... Endless belt, 12.13, 14.17... Rotating roller, 15
...Belt, 16...Belt sending side, 18...
・Belt winding! 1111.19...Permanent magnet,
19a, 19b... Opposing surface, 20... Support part, 21
...Driving means, 22...Adsorption member, 23...Cassette, 24...Roller, 25...Brim. Agent Laf-Ri± (8107) Kiyotaka Sasaki
-1, HH, Dingpa (and 2 others) ゛) 2nd compilation 3 Figure 4 Figure 7 Figure 8 Figure procedural amendment n * sum 6 April '7 B

Claims (1)

[Scope of Claims] 1) When winding a magnetic tape onto a tape winding body, a magnetic field is applied to the tape winding body by applying a magnetic field that is inclined in a substantially conical shape around the rotational axis of the tape winding body. Magnetic 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 the magnets having opposing surfaces of different sizes are provided facing each other above and below the 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.