JPS62180575A - Taking up method for magnetic tape - Google Patents

Abstract

PURPOSE:To improve the shape of winding and eliminate bad influences given by a magnetic field to performance of a tape by taking up the magnetic tape applying a magnetic field that gives energizing force in a fixed direction to the tape, and demagnetizing after termination of taking-up. CONSTITUTION:A pair of permanent magnets 19 are attached to the body of a take-up 1 supported by a non-magnetic support 20 around a tape reel 2 that takes up a magnetic tape T. Different poles of the permanent magnets 19 are opposed, and direction of the magnetic field is nearly along the radial direction of the tape reel 2, and energizing force in a fixed direction is given to the magnetic tape T by the magnetic field. Magnetic tapes attract each other in the direction of thickness, and frictional force between tapes becomes large, and thereby, deviation of winding of the magnetic tape T in the direction of width of the tape can be suppressed. Magnetization of the magnetic tape T taken up in the magnetic field is degaussed by passing through a degausser.

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 method for winding a magnetic tape when rewinding the tape onto another tape winding body, and furthermore, when winding the magnetic tape in a wide range of states before making it into an original tape.

(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 material is transformed into small pieces such as reels and hubs. A process of winding a predetermined length of magnetic tape onto a tape winding body, a rewinding process of winding the magnetic tape once wound onto a tape winding body in order to rewind it onto another tape winding body, and furthermore. There is a winding process when the tape is wide before the original roll.

When the magnetic tape is wound around the tape winding body in this winding process and rewinding process, for example, the physical properties of the magnetic tape original fabric on the sending side.

Alternatively, depending on the physical properties of the tape wrapping body on the winding side, or 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. This causes a problem in the winding form (winding state) of the wound magnetic tape, that is, winding irregularity occurs in which the face (tape edge) becomes uneven when observed from the axial direction of the tape winding 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, not only has poor appearance quality but also tends to be damaged at the tape end, causing 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 those used for videos, audio signals and tuning signals are recorded near the edges of the tape, so the winding disturbances described above are an extremely serious problem.For this reason, conventional magnetic tapes In the manufacturing process, after the winding process and rewinding process, the appearance of the rolls must be checked (for example, visually inspected), and the cost and time required for this is a major factor in the magnetic tape manufacturing process. It was a big bottleneck.

In addition, in order to reduce this inspection load, we aim to improve the winding appearance.In winding magnetic tape with a low yield of non-defective winding tapes, we have conventionally used decorative windings such as 1- shown in Figs. 5 and 6. The method called

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, rotating rollers 12, 13 . A flexible endless belt 11 made of, for example, rubber or polyimide, which is rotatably held by i4, rotates together with the magnetic tape T and elastically presses the tape magnetic surface in the radial direction of the tape wrapping body 2. The configuration is such 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 on the belt feeding side 16 and is held by a rotating roller 17 etc. and is wound at a slow and constant speed).While the belt 15 is being wound on the winder 911118, one edge of the tape is pressed. I try to keep the volume neat.

However, since both of the above structures have a structure in which they are in direct contact with the magnetic tape T, for example, dropouts occur due to the magnetic layer being scratched or nonwoven 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 not only have problems in terms of cost and maintainability because of wear and tear on the tape winding mechanism itself, but also when replacing the tape winding body, at least the position where the function is performed and the joint position must be removed. Does it have to be structured so that it can be moved to and from the position, and a winding device? If an attempt is made to increase productivity by making the process complicated and replacing the tape wrapping body relatively time consuming, the time taken to move the tape winding body is also an obstacle to improving productivity.

What are the current winding methods for cassette tapes? ＋I CosmeticsIn addition to the open winding method in which the product is completed by inserting it into a cassette after applying makeup, there is another method in which the magnetic tape is wound up at the final stage of the cassette set V process. There are methods called in-casset winding, C-0 winding, and ■-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 leader tape 10 is connected to a tape winding body on the sending side and a tape winding body on the winding side. After the body has been inserted and the screws have been tightened, the leader tape is pulled out using a winding head called an input set winder, cut on one side of the workpiece (generally referred to as v-o, c-o, etc.). The leading end of the magnetic tape to be wound is joined to the leader tape of the other side, the other leader tape is held by the absorbing member 22, and the tape winding body 2 on the joined side is rotated. A cassette tape winding method t in which the tape T is wound and cut, and finally the end of the wound magnetic tape T and another leader tape 10 are joined to complete the product.
be. This in-cassette winding method f is based on the above-mentioned part of the tape winding body.It is impossible to mechanically contact the magnetic tape, 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 rate is extremely low. In this case, a roller 24 having upper and lower ribs 25 at the entrance of the cassette to improve the winding appearance.
Attempts have been made to push the tape to one side by applying force in the width direction of the magnetic tape as it is being wound. There is no way to improve the tape wrapping condition, and there is no way to improve the condition of the tape.

In addition, the conventional method shown in FIGS. 5 to 8 above deals with winding after the S-air tape is made into a raw material, but before the magnetic tape is rolled into a raw material, for example, the magnetic tape is It has been desired to improve the tape winding condition even when a member such as a flange is not provided to regulate the edge of the tape during winding.

(Purpose of the Invention) The present invention has been made to compete with such problems, and even if the physical properties of the magnetic tape are irregular, the winding shape of the tape-wrapped body when it is wound does not change. Because it winds up without causing any disturbance;! l) The object of the present invention is to provide a magnetic tape winding method.

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 physically contacts the magnetic tape, and the tape winding process An object of the present invention is to provide a complete magnetic tape winding method that can improve workability.

Furthermore, magnetic tape winding can dramatically improve the appearance of the in-cassette winding method, which previously had no means of improving the appearance of the roll, and the wide magnetic tape winding method used before the original tape. There is one that aims to provide a method for

(Structure of the Invention) The above object of the present invention is to apply a magnetic field that applies a biasing force in a certain direction to the magnetic tape at least in the vicinity of the tape winding body when winding the magnetic tape around the tape winding body. This is achieved by a magnetic tape winding method characterized by demagnetizing the magnetic tape after winding is completed.

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

1 and 2 show a magnetic tape winding device 1 according to the present invention.
Schematic front view of one embodiment of 11I from the direction of arrow A
It is a front view. This winding device 1 is used, for example, in a method in which a 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, and then assembled into the video tape cassette. There is.

The general operation of the winding device 1 will be described below.

First, the tape reels 2 and 6 are connected by a leader tape 10 having a predetermined length (only half of one side is shown in FIG. 1) and are driven to rotate in the winding device 1. After being attached to the shafts 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 original 6 that has been attached in advance are joined with a bonding tape or the like. be done. Then, after the magnetic tape T wound to a fixed length sr on the tape reel 2 is cut, its end portion is joined to the leader tape 10 on one tape reel 6 side.

Note that the cutting of the leader tape 10 and the magnetic tape T and the joining of the M')-der tape 10 and the magnetic tape T are as follows.
The cutting and joining means 9 is provided with a tape end holding member, a cutting cutter, a joining tape, etc., and
The magnetic tape T sent out from the original tape 6 is wound onto the tape reel 2 through a nozzle system 8 consisting of guide pins, guide rollers, etc. Also, in FIG. 2, 9ft of the cutting and joining means have been omitted.

Within the above range, f is the same as in the conventional device, but one of the features of the present invention lies in the mounting portion of the tape reel 2. That is, a pair of permanent magnets 19 are provided around the tape reel 2 that winds up the magnetic tape Tft. The permanent magnet 19 is supported by a support portion 20 made of, for example, a non-magnetic material and is attached to the main body of the winding device 10,
Tape IJ + Symmetrical with respect to the rotation axis of Le 2 - 4% IJ
- provided along the radial direction. As shown in FIG. 6, the permanent magnet 19 is configured to rotate different poles, and the direction of the magnetic field is generally along the radial direction of the tape reel 2. By this, it is possible to apply a biasing force to the magnetic tape T in a certain direction.

Note that the shaft 4 is connected to a driving means 21 such as a motor so as to be rotationally driven.

When the magnetic tape T is wound up with the winding portion configured in this way, the magnetic tape T is placed in the lines of magnetic force extending linearly from the north pole to the south pole of the permanent magnet 19. Therefore, the magnetic tapes attract each other in the thickness direction, and the frictional force between the tapes increases. Further, for example, deviation in winding of the tape 1 in one direction due to changes in the behavior of the magnetic tape T can be suppressed without mechanical contact.

Therefore, the hunting tape T is cut off in an extremely favorable state in which the edges of the tape are aligned, and this state is maintained. As a result, as is clear from FIG. 6, the magnetic tape T can be wound in the center between the two flanges without being wound around the flanges 2aK+Je, that is, so-called center winding.

The strength of the magnetic force of the permanent magnet 19 is not particularly limited, and includes, for example, the tape tension during winding, the type of hunting tape T, the distance between the magnet 19 and the magnetic tape T, the winding speed (tape running Settings can be made taking into consideration various conditions such as speed).

The magnetic tape T wound up in the magnetic field in this manner is magnetized, but it can be demagnetized by a demagnetizer as shown in FIG. 4, for example. The demagnetizer 30 shown in FIG. 4 has a tunnel-like configuration, and the magnetic tape T wound once in a magnetic field can pass through the demagnetizer 60. That is, the magnetic tape T wound around the tape reel 2 (which is also connected to the tape reel 6) or the cassette case loaded with the reels 2 and 3 is transported by a conveying means such as a belt conveyor 61. The demagnetizer 60 is demagnetized by passing through the demagnetizer 60 for a time of about 5 to 10 seconds, for example, 1''.The demagnetizer 60 is a well-known electromagnet through which an alternating current is passed.

The magnetic tape T demagnetized as described above becomes of high quality with excellent recording and reproducing characteristics with less noise and the like.

In the above embodiment, the permanent magnet 19 is configured to be fixed at a predetermined position, but if it is movable along the radial direction of the reel, it can freely correspond to the size of the tape reel 2, and the magnetic tape It goes without saying that the strength of the magnetic force acting on T can be freely changed, and that the demagnetizer 60 is not limited to the embodiment shown in FIG. 4, but can be modified in various ways. Further, in the present invention, there is no particular limitation on the direction of the magnetic field when winding the tape.

Although a permanent magnet is used as the magnet 19 in each of the embodiments described above, the present invention is not limited to this, and an electromagnet can also be used. In this case, by changing t of the current flowing through the electromagnet, the magnetic force of the electromagnet can be freely changed.

The present invention is not limited to the embodiments shown above, and can of course be applied to a tape winding body without a flange, for example, to a winding process before making a magnetic tape into a raw material, as well as other winding methods. For example, there is one method that can be applied to an in-cassette winding method.

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

(Effects of the Invention) As described in detail above, when winding magnetic tapes as in the present invention, by applying a magnetic field in the thickness direction of the magnetic tapes using a magnetic field, the magnetic tapes can mutually interact with each other. In addition, the running of the tape is extremely stable, and the edges of the wound mountain tape are aligned, resulting in a very favorable winding condition. In addition, the present invention can apply a force that improves the winding state (winding shape) of the magnetic tape without any contact, regardless of the presence or absence of flanges! The quality of the magnetic tape can be improved without causing problems such as bending of the tape, damage to the edges of the tape, or damage to the tape surface due to contact as in the past! Wear. Further, the winding device according to the 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. Especially when it comes to flangeless tape winding bodies and winding devices that use the in-cassette winding system, the IQ
It is possible to provide dramatically improved methods and apparatus.

Furthermore, in addition to the above-mentioned effects produced by applying a magnetic field during winding, the present invention erases the magnetized magnetic tape after winding, thereby eliminating the adverse effect on tape performance caused by tampering during winding. It is possible to avoid this problem and provide high quality magnetic tape.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of one implementation of the winding device of the present invention;
Fig. 2 is a schematic 4ft 11 side view of the same, Fig. 3 is an enlarged sectional view of the main part along the axial direction of Fig. 2, Fig. 4 is a schematic perspective view showing one embodiment of the demagnetizer, Figs. Figure 6 is a schematic perspective view showing a part of a conventional winding device, and Figure 7 is a schematic plan view of a conventional winding device using an in-cassette winding method.
Figure 8 is an enlarged side view of the main parts of Figure 7↑ 0 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, 12.13, 14.17...rotary opening~u, 15・
...belt, 16...4 belt delivery side, 18.
...Belt winding side, 19...Permanent capstone, 20
...Supporting part, 21...Driving means, 22...Adsorption member, 23...Cassette, 24...Roller, 2
5...Brim, 30...Demagnetizer, 61...
belt conveyor. Figure 2 7t! f No. 8 Figure Proceedings Amendment Statement April 7, 1986

Claims (1)

[Claims] When winding the magnetic tape onto a tape winding body, a magnetic field is applied at least in the vicinity of the tape winding body to apply a biasing force to the magnetic tape in a certain direction, and the magnetic tape is demagnetized after winding is completed. magnetic tape winding method.