JPH0580759B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to the method of winding a magnetic tape of a predetermined length from a magnetic tape original roll onto a small tape winding body, or once wound onto a tape winding body. When rewinding a 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 cutting a wide range of tapes into tapes with multiple product widths. The present invention relates to a magnetic tape winding method and device for winding.

(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 rewinding process of winding the magnetic tape once wound onto a tape winding body to rewind it onto another tape winding body, and even the process of winding the magnetic tape of a predetermined length onto a tape winding body. There is a winding process when the width of the tape is wide before cutting, and a winding process after cutting.

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, such as the vibration of This results in irregular winding with uneven edges (edges). In particular, the higher the tape running speed during winding, the stronger this tendency becomes.

When a magnetic tape with such irregular winding occurs, for example, when it is stored in a magnetic tape cassette, it not only has poor appearance quality but also tends to cause damage to the tape ends, causing various troubles.
There are problems such as deterioration of electromagnetic conversion characteristics. Particularly in magnetic tapes for high-density recording, such as those for video, 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 is performed to check the appearance of all the tapes, which is costly and time consuming. This was a major bottleneck in the magnetic tape manufacturing process.

In addition, in order to reduce this inspection load, in order to improve the winding appearance, conventionally, for example, when winding magnetic tapes with a low yield of good winding shapes,
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 tape magnetic surface 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 appearance of the magnetic tape T is adjusted. 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
While the tape wound on the belt feeding side 16 is held by the rotating roller 17 and is being wound on the winding side 18 at a slow and constant speed, one edge of the tape is pressed. I'm trying to keep the volume neat.

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 magnetic tape is used in the final stage of the cassette assembly process. There is a method called in-cassette winding, C-O winding, or V-O 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 onto the workpiece (generally referred to as V-O, C-O, etc.) that has been inserted and the screws have been tightened, and then wound around the leader tape on one side of the workpiece. 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 poor.
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 axial direction of the magnetic tape being wound to move the tape 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.

In addition, the conventional methods shown in Figs. 5 to 8 above concern winding after the magnetic tape is made into an original fabric, but before the magnetic tape is made into an original fabric, for example, when the magnetic tape is wide It has been desired to improve the tape winding state even when a member such as a flange is not provided to restrict the edge of the tape during winding.

(Object of the Invention) The present invention has been made in view of the above circumstances, and it is possible to prevent irregularities in the winding shape of the tape wrapping body when it is wound, even if the physical properties of the magnetic tape vary. It is an object of the present invention to provide a magnetic tape winding method and device that can wind the magnetic tape 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, the appearance of the tape can be dramatically improved for the in-cassette winding method, for which there was no way to improve the appearance of the tape, for the winding of wide magnetic tape before the original tape, and for the winding after cutting. The object of the present invention is to provide a magnetic tape winding method and device that can perform the following steps.

(Effects of the Invention) The above object of the present invention is to first apply a biasing force in a certain direction to the magnetic tape at least at the tape winding body when the magnetic tape is wound around the tape winding body. A magnetic tape winding method characterized in that a magnetic field is applied by an electromagnet, and a magnetic field for demagnetizing the magnetic tape is applied by the same electromagnet just before or after the end of winding, and an apparatus capable of carrying out the method, that is, a tape A magnetic tape winding device that winds a magnetic tape by rotating a winding body is provided with an electromagnet that can apply a magnetic field to the magnetic tape, the current flowing through the electromagnet can be freely switched between direct current and alternating current, and the amount of current is variable. This is achieved by a magnetic tape winding device that is characterized by being freely configured.

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 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 reel") built into a video tape cassette, and then assembled into the video tape cassette. It is.

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 fed out from the tape original 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 the present invention is that the tape reel 2
It is in the mounting part. That is, a donut-shaped electromagnet 19 as shown in FIG. 3 is provided around a shaft 4 that engages with the center hole of the tape reel 2 for winding up the magnetic tape T. electromagnet 19
For example, the winding device 1 is supported by the support section 20.
is attached to the main body of the tape reel 2, and is located close to one flange 2a of the tape reel 2. The electromagnet 19 has a structure in which a coil 19a is wound around the outer periphery of a cylindrical iron core 19b, and the width l in the direction along the tape reel 2 is at least larger than the width of the tape being wound. This is desirable. Therefore, the direction of the magnetic field of the electromagnet 19 applied to the magnetic tape T wound on the tape reel 2 can be made generally along the direction of the axis 4.

Further, the coil 19a is configured so that direct current and alternating current can freely flow therethrough, and the amount of the current can also be changed freely.

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

When winding up the magnetic tape T in the winding portion configured as described above, a direct current is passed through the coil 19a. As a result, the magnetic tape T is pulled toward the electromagnet 19 and wound so that one end of the magnetic tape T comes into contact with the flange 2a on the magnet side. Furthermore, the tape itself, which has already been wound up on the tape reel 2, is also held in a stable state because it receives the force of the magnetic field as a whole. That is, 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 mobile, the edges of the tape can be easily aligned by the magnetic force of the electromagnet 19.

The strength of the magnetic force of the electromagnet 19 is not particularly limited, and includes, for example, the tape tension during winding, the type of magnetic tape T, the distance between the electromagnet 19 and the magnetic tape T, and the winding speed (tape running speed). ,
It can be set in consideration of various conditions such as.

By passing a direct current through the coil 19a as described above, the electromagnet 19 can apply a biasing force to the magnetic tape T in a certain direction. However, since the magnetic tape T is magnetized by this, the following measures are taken.

That is, just before or after the end of the process of winding the magnetic tape T onto the tape reel 2, the direct current flowing through the electromagnet 1 is switched to an alternating current, and the amount of current is gradually reduced until it reaches zero. Make it. By operating the electromagnet 19 in this manner, the magnetic tape T is demagnetized. Therefore, the magnetic tape T that has been completely wound is demagnetized on the spot, and a high quality product free of noise and the like can be obtained.

In the embodiment described above, the electromagnet 19 is configured to be fixed at a predetermined position, but it may be made movable along the axis 4. Further, the electromagnet 19 does not have to have a donut shape as shown in FIG. The shape can also be changed in various ways.

Further, in the embodiment described above, the direction of the magnetic field applied to the magnetic tape T is generally along the tape width direction, but the present invention is not limited to this. For example, the electromagnet 1 is applied along the reel radial direction.
The position of the electromagnet 9 can be changed or made movable, and the number of the electromagnets 19 is not necessarily limited to one, but a plurality of electromagnets 19 can also be used. Therefore, for example,
When the tape reel 2 is wound by applying a magnetic field in the radial direction of the tape reel 2 with electromagnets having opposite polarities in the radial direction, a force that attracts each other in the tape thickness direction acts on the wound magnetic tape T. death,
The friction between the tapes increases and the tapes can be wound tightly, and the tapes can be wound without shifting in the tape width direction. In other words, even in the case of a tape wrapping body that does not have a flange or the like to align the tape edges,
It is possible to wind the tape in a good state.

Although the winding device 1 has a structure in which the magnet is provided only at the shaft 4, the present invention is not limited to this. Alternatively, a magnet may be provided as appropriate to apply magnetic force in the tape width direction, thereby suppressing the vibration of the magnetic tape T in the width direction and stabilizing the tape running performance.

Further, although the above embodiments have described an Opreel type winding device, the present invention is also applicable to other types of winding devices, such as an in-cassette type winding device,
It goes without saying that the present invention can also be applied to a winding device for the original tape.

In this specification, the term "electromagnet" refers to electrical magnetic field generating means, and includes, for example, solenoids.

(Effects of the Invention) As described in detail above, when winding a magnetic tape as in the present invention, by applying a magnetic force in a fixed direction to the magnetic tape using a magnetic field, tape running becomes extremely stable. The edges of the wound magnetic tape are aligned, resulting in a very favorable winding state. Furthermore, since the present invention can apply a force to improve the winding state (winding shape) of the magnetic tape without contact, 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.

In addition to the above-mentioned effects caused by applying a magnetic field during winding, the present invention can demagnetize a magnetic tape that has been magnetized during the winding process on the spot, and the negative effects on tape performance caused by the magnetic field during winding. can be avoided and can provide high quality magnetic tape.

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 one embodiment of the winding device of the present invention, FIG. 2 is a schematic side view thereof, and FIG.
4 is an enlarged sectional view taken along the axial direction of FIG. 2, and FIGS. 5 and 6 are schematic perspective views showing a part of a conventional winding device, respectively. 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... Electromagnet, 19a... Coil, 19b
...Iron core, 20... Support part, 21... Drive means, 22...
Adsorption member, 23...cassette, 24...roller, 25
…spit.

Claims (1)

[Scope of Claims] 1. When winding a magnetic tape around a tape winding body, a magnetic field is first applied to the magnetic tape at least at the tape winding body by an electromagnet to apply a biasing force in a certain direction. A magnetic tape winding method characterized in that a magnetic field for demagnetizing the magnetic tape is applied by the same electromagnet just before or after winding is completed. 2. A magnetic tape winding device that winds a magnetic tape by rotating a tape winding body is provided with an electromagnet that can apply a magnetic field to the magnetic tape, and the current flowing through the electromagnet can be freely switched between direct current and alternating current, and the amount of current is variable. A magnetic tape winding device characterized in that the magnetic tape winding device is configured to be freely variable. 3. The magnetic tape winding device according to claim 2, wherein the electromagnet is provided near the tape winding body.