JPH0447834Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of the Invention) The present invention is capable of winding a predetermined length of magnetic tape from a product-width original magnetic tape onto a small tape winding body, or by winding 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.

(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 before rolling is wide, and a process of cutting and winding a raw tape roll that is wider than the product width into tape rolls of multiple product widths.

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 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 problems, 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 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, 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, in order to improve the winding appearance, conventionally, for example, when winding magnetic tapes with a low yield of good winding shapes,
As shown in the figure, a method called decorative winding is adopted.

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 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. 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 slowly wound on the winding side 18 at a 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 it did not function as intended. Furthermore, these decorative winding mechanisms are subject to considerable wear and tear, which poses problems in terms of cost and maintainability.

In addition, the conventional method shown in FIGS. 5 and 6 above concerns winding after the magnetic tape is made into a raw material, but before the magnetic tape is made into a product width material, for example, the magnetic It has been desired to improve the tape winding condition even when the tape is wide and is not provided with a member such as a flange to restrict the edge of the tape during winding.

Recently, as shown in FIG. 7, the winding drive shaft 30, which is detachably connected to the winding core 41 of the winding reel 42 constituted by a winding core 41 and a flange 42, is A magnetic tape winding device in which at least one magnet 31 is arranged at a position symmetrical to the side on which the magnetic tape T is wound with the flange 42 as a plane of symmetry, and the magnetic tape T is wound around the take-up reel 40. was proposed (Unexamined Japanese Patent Publication No. 1986-
51642).

However, as shown in FIG. 7, the magnet 31 provided around the shaft 30 has the following drawbacks.

The problem is that in the magnet 31 provided around the winding drive shaft 30, the winding appearance of the central portion near the winding core 41 is worse than the winding appearance of the outer portion.

This is because the shape of the magnet 31 is constrained by the shaft 30, so it is configured in a donut shape, for example, with a hollow center, and the magnetic lines of force have a constant direction at a location near the center of the take-up reel 40. In addition, the magnetic flux density decreases, and the magnetic tape T is moved to the flange 4 at the initial stage of the winding process.
The force of attraction in two directions becomes unstable and weak. Furthermore, when the take-up reel does not have a flange (flangeless type), the apparatus shown in FIG. 7 cannot be applied at all.

(Purpose of the invention) The present invention has been developed in view of the above circumstances, and is intended to solve the problem that even if the physical properties of the magnetic tape vary, the winding appearance of the tape wrapping body will be disordered. It is an object of the present invention to provide a magnetic tape winding device that can wind up a 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 device that can improve workability.

(Structure of the Invention) The above object of the invention is to provide a magnetic tape winding device that rotates a tape winding body to wind a magnetic tape, in which a magnetic field generally along the tape thickness direction is applied to at least the vicinity of the tape winding body. This is achieved by a magnetic tape winding device characterized in that it is provided with a magnet that generates electricity and a moving means that allows the magnet to move freely along a tape winding shaft.

Hereinafter, embodiments 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 or 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, it 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 pair of permanent magnets 1 are placed around a tape reel 2 that winds a magnetic tape T.
9 is provided, and a moving means is provided so that the permanent magnet 19 can move along the tape winding shaft 4 in the tape width direction.

The structure of the above moving means will be explained in detail based on FIGS. 3 and 4.

As shown in FIGS. 3 and 4, the permanent magnets 19 are respectively attached to a pair of support parts 20, and are provided with different poles facing each other along the reel radius with the tape reel 2 in between. Therefore, the direction of the magnetic field is generally along the radial direction of the tape reel 2. Further, the support section 20 includes, for example, three shafts 2 provided along the tape winding shaft 4.
3, two shafts 23 penetrate through each and are held slidably, and the shafts 2
A ball screw 26 provided in the same direction as 3 passes through the ball screw 26 and is moved by rotation of the ball screw 26. In addition, three shafts 23
The two ball screws 26 are fixedly and rotatably supported by a U-shaped holding portion 22 at their tip portions, and are attached to the main body of the winding device 1 . However, the bearings and details of the attachment to the main body are not shown. The ball screw 26 is the motor 2
5, etc., and the motor 2
By the rotation of 5, the support part 20 can be moved to an appropriate position with respect to the tape width direction.

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

With the winding section configured in this way, the magnetic tape T
When the magnetic tape T is wound up, 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, so that the magnetic tapes are mutually connected in the thickness direction. This creates an attraction effect and increases the frictional force between the tapes. Further, for example, winding deviation in the tape width direction due to changes in the behavior of the magnetic tape T can be suppressed without mechanical contact (also without contact with the reel flange). Therefore, the magnetic tape T is wound in an extremely favorable state in which the tape edges are aligned, and this state is maintained. As a result, as is clear from FIG. 4, not only is it possible to wind the magnetic tape T approximately at the center between both flanges without touching the flange 2a, so-called center winding, but also the permanent magnet 19 can be wound around the tape width. By winding up at the position moved in the direction,
The winding position of the magnetic tape T to be wound can be freely shifted in the tape width direction. That is, since the density of magnetic lines of force is highest near the center of the opposing permanent magnets 19 in the tape width direction, the fourth
If the permanent magnet 19 is aligned with and facing the center line c between the reel flanges 2a shown in the figure, center winding is possible, and if it is facing at a position offset to either side, then , the tape winding position can be shifted in the deviated direction.

Therefore, the tape winding position can meet various customer needs by positioning the permanent magnet 19.

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 magnetic tape T, the distance between the magnet 19 and the magnetic tape T, the winding speed (tape running It can be set in consideration of various conditions such as speed) and the influence of the magnetic field on the magnetic tape T. Further, demagnetization may be performed after that if necessary.

In the embodiment described above, a pair of permanent magnets 19 are provided with opposite poles facing each other, but a structure in which a plurality of magnets are provided in the support part 20 may also be used, and the structure need not be such that the tape reel 2 is sandwiched between the permanent magnets 19. Alternatively, at least one magnet may be provided on either side. Furthermore, the permanent magnet 19 is
It may be a rectangular parallelepiped as shown in FIG. It may be configured in any of the following shapes.

Although a permanent magnet was used as the magnet in the above embodiment, the present invention is not limited to this, and an electromagnet may 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.

The present invention is not limited to the embodiments shown above, but can also be used, for example, when cutting and winding a tape material wider than the product width into tape material having multiple product widths, and furthermore, the flange Even in a winding device using a tape winding body (only a winding core) without a winding core, the present invention can be sufficiently applied, for example, when it is desired to shift the winding position with respect to the winding core.

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 explained in detail above, when winding magnetic tapes as in the present invention, by applying a magnetic field in the thickness direction to the magnetic tapes using a magnetic field, the magnetic tapes can mutually interact with each other. Since the attraction and tape running are extremely stable, the edges of the wound magnetic tape are aligned, resulting in a very favorable winding state. 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, so that it is possible to apply a force that improves the winding state (winding shape) of the magnetic tape without any contact. ,
Problems such as damage to the tape edge and damage to the magnetic surface do not occur, and the quality of the magnetic tape can be improved. Furthermore, since the present invention has a structure in which the position of the magnet is movable in the tape width direction, the tape winding position can be extremely easily adapted to various needs.

Therefore, according to the present invention, it is possible to freely change the center winding or winding position of the magnetic tape with respect to the upper and lower flanges, and it is possible to provide an extremely excellent magnetic tape winding device with good tape quality and productivity.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of an embodiment of the magnetic tape winding device of the present invention, FIG. 2 is a schematic side view thereof, FIG. 3 is an enlarged plan view of essential parts of the present embodiment, and FIG. 4 is a diagram of the present embodiment. 5 and 6 are respectively schematic perspective views showing a part of the conventional winding device, and FIG. 7 is a sectional view showing a part of the conventional device. 1... Winding device, 2, 3... Tape winding body (tape reel), 4, 5... Tape winding shaft, 6...
Original fabric, 8... Pass system, 9... Cutting and joining means, 11
...Endless belt, 12, 13, 14, 17
... Rotating roller, 15 ... Belt, 16 ... Belt sending side, 18 ... Belt winding side, 19
...Permanent magnet, 20... Supporting part, 21... Driving means, 22... Holding part, 23... Shaft, 25...
...Motor, 26...Ball screw.

Claims (1)

[Claims for Utility Model Registration] 1. In a magnetic tape winding device that winds a magnetic tape by rotating a tape winding body, a magnet that generates a magnetic field generally along the tape thickness direction at least in the vicinity of the tape winding body. What is claimed is: 1. A magnetic tape winding device comprising: a magnetic tape winding device; and a moving means that allows the magnet to move freely along a tape winding shaft. 2. Utility model registration claim 1, characterized in that the magnet is comprised of a pair of magnets with different polarities facing each other along the radial direction of the tape wrapping body.
The magnetic tape winding device described in 2. 3. A support section in which the moving means supports the magnet; a shaft that penetrates the support section along the tape winding shaft and supports the magnet in a slidable manner;
A utility model registered as claimed in any one of claims 1 to 2, comprising a ball screw connected to a rotational drive means to penetrate and move the support part along the same direction as the shaft. The magnetic tape winding device according to item 1.