JPS62281177A - Magnetic tape take-up device - Google Patents

Abstract

PURPOSE:To obtain excellent winding attitude even in a tape behavior unstable region at the start of winding of a magnetic tape by providing a magnet acting like pulling the magnetic tape at the inside of a drive shaft driving a tape reel. CONSTITUTION:A permanent magnet 19 is arranged near a tape reel 2 winding the magnetic tape T and a winding rotary shaft 4 is constituted to cover the magnet 19. In winding the tape T, the tape T is pulled by the permanent magnet 19 and wound while being biased in the flange direction at the lower side of the tape reel 2. Since the permanent magnet 19 is constituted as a disk, the direction of the magnetic field and the magnetic flux density are stable at the center part and a stable magnetic force is give from the start to the end of the winding to the tape T, the tape side ridge is well arranged and the tape is wound tightly to show excellent tape winding state.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of the Invention) The present invention provides a method for winding a predetermined length of magnetic tape from a product-width original magnetic tape onto a small tape winding body; When rewinding a magnetic tape that has been wound onto a tape winding body onto another tape winding body, or when winding a magnetic tape in a wide range of conditions before making it into a tape winding body, or when winding a magnetic tape that is wider than the product width. The present invention relates to a magnetic tape winding device for cutting and winding a tape material having a plurality of product widths.

(Prior technology) Audio cassette tapes, video cassette tapes,
Furthermore, in the manufacturing process of magnetic tapes such as memory tapes and broadcast video tapes, as an intermediate step, a predetermined length of magnetic tape is wound from a long magnetic tape material onto a small tape wrapping body such as a reel or hub. The re-winding process of rewinding the magnetic tape once wound onto a tape winding body to rewind it onto another tape winding body, and the winding process when the width of the tape before the original tape is wide. , and the process of cutting and winding a tape material wider than the product width into tape material having multiple product widths.

When winding the magnetic tape onto the tape winding body in this winding process and rewinding process, for example, the physical properties of the magnetic tape original on the sending side or the physical properties of the tape winding body on the winding side Furthermore, depending on the physical properties of the magnetic tape itself, the so-called tape behavior may change during winding, such as vibrations in the tape thickness direction or width direction. Problem B) occurs, that is, the tape winding is disordered in that the spine (edge of the tape) 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.

When a magnetic tape with such irregular winding occurs, for example, when the product is stored in a magnetic tape center, it not only has poor appearance quality but also tends to cause various troubles such as uneven winding or damage to the tape ends. There are problems such as deterioration of electromagnetic conversion characteristics. Particularly in magnetic tapes for video, which perform high-density recording, 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 or 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 winding appearance, a conventional method for 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 6. 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 relatively strongly in the radial direction to adjust the winding shape of the magnetic tape T. In the case of the one shown in FIG. 6, one flange of the tape wrapping body 2 and the magnetic tape T
Belt 1 made of relatively soft non-woven fabric etc. between the edge of
5 is provided. This belt 15 is wound on the belt delivery side 16 and is held by a rotating roller 17 etc. and is taken up at a slow and constant speed on the winding side 18, while one tape edge is compared. I try to press it hard and keep it in shape.

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.If you are trying to improve productivity, the time taken to move the tape winding body will also reduce productivity. This is a hindrance to improvement.

The current winding method for cassette tapes includes the oven winding method, in which the product is completed by inserting it into a cassette/torque after the above-mentioned decorative winding. The so-called in-casset winding or C-0 winding, V
There is a method called -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 workpiece has been inserted and the screws have been tightened (this is generally called ■-0, C-0, etc.)
After pulling out and cutting the leader tape using a winding device called an impulse winder, the leading end of the magnetic tape to be wound is joined to one of the leader tapes, and the other leader tape is held by an adsorption member 22. Then, the tape winding body 2 on the joined side is rotated to wind and cut the magnetic tape T of a predetermined length, and finally, the P: end of the wound magnetic tape T and the other leader chip 110 are connected. This is a winding method for cassette tapes that are joined together 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 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 width direction of the magnetic tape being wound to move the tape to one side. Attempts have been made to press the tape, but applying strong force increases the risk of scratching the tape edges, while weak force has little effect on improving the tape winding state. There was absolutely nothing I could do to make it better.

However, recently, as shown in FIG. 9, the flange has been installed around the winding drive shaft 30 which is detachably connected to the winding core 41 of the winding reel 42, which is composed of a winding core 41 and a flange 42. A magnetic tape winding device is provided, in which at least one magnet 31 is disposed at a position symmetrical to the side on which the magnetic tape T is wound with 42 as a plane of symmetry, and winds the magnetic tape T onto the take-up reel 40. proposed (Unexamined Japanese Patent Publication No. 1983)
-51642).

However, as shown in FIG. 9, the magnet 31 provided around the shaft 30 has the following drawbacks.

The problem is that the magnet 3 provided around the winding drive shaft 30
In No. 1, 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 restricted by the shaft 30, so it is configured in a donasot shape, for example, and its central portion is hollow, and the lines of magnetic force are directed in a location near the center of the winding wheel 40. The magnetic flux density is not constant, and the magnetic flux density becomes small, and the magnetic tape T
The force that attracts it toward the flange 42 is unstable and weak (
turn into.

Furthermore, if the take-up reel does not have a flange, the device shown in FIG. 9 cannot be used.

(Object of the Invention) The present invention has been made 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 shape of the tape wrapping body is disturbed when it is wound. 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.

Furthermore, the winding appearance of the in-casset winding method and the flangeless winding method, which was previously impossible to improve the winding appearance of the wide magnetic tape used before the original tape, has been dramatically improved. The object of the present invention is to provide a magnetic tape winding device that can perform the following steps.

(Structure of the Invention) The above-mentioned object of the present invention is to provide a magnetic tape winding device that winds a magnetic tape by rotating a tape winding body, in which a magnet that generates a magnetic field generally along the tape width direction is connected to the tape winding body. This is achieved by a magnetic tape winding device characterized in that it is provided so as to intersect the rotation center line on the side of the winding rotation axis.

Embodiments of the present invention will be described in detail below.

FIGS. 1 and 2 are a schematic front view and a side view from the arrow direction of one 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 reels") 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 reel 2.3 is connected by a leader tape 10 having a predetermined length (only one half of the tape is shown in FIG. 4.5, the leader tape 10 is cut approximately at its center, and the end on the tape reel 2 side and the tip of the magnetic tape original 6 previously attached are joined. Then, after the magnetic tape T wound around the tape reel 2 to a predetermined length is cut, its end portion 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 acid 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. Also, 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 range, the feature of this embodiment lies in the mounting portion of the tape reel 2. That is, the tape reel 2 that winds the magnetic tape T
The permanent magnet 1 ( ) is disposed close to the permanent magnet 19, and the winding rotation shaft 4 is configured to cover the permanent magnet 19.Furthermore, an enlarged cross section near the winding rotation shaft 4 To explain based on FIG. 4, the winding rotation shaft 4 is provided with a retaining portion 4a that engages with the tape reel 2 at the center of rotation of a hollow cylindrical body 4b. A pulley 4C to which a belt 26 is attached is provided on the outer periphery.On the other hand,
The permanent magnet 19 is disk-shaped as shown in FIG. 3, and its diameter is <
i> is at least larger than the tape winding diameter, and the magnetic poles are located on the upper and lower surfaces thereof.

The permanent magnet 19 is fixed to the front panel of the device 1 by, for example, a support member 20, and the winding rotation shaft 4 is rotatably provided so as to cover the permanent magnet 19. That is, the permanent magnet 19 and the body portion 4b have a bearing structure. For example, a drive heald 26 is attached to a motor-side pulley 21a provided on the rotation shaft of a drive means such as a motor 21 and a pulley 4C provided on the body 4b, and the driving force of the motor 21 is transferred to the winding rotation shaft 4. is configured to be transmitted to

Further, the direction of the magnetic field of the permanent magnet 19 (the direction of the lines of magnetic force) is generally along the tape width direction (direction of the rotational axis of the shaft 4) over almost the entire area of the tape reel 2.

When the magnetic tape T is wound up with the winding device 1 configured in this way, the magnetic tape T is pulled by the permanent magnet 19 and wound so as to be biased toward the lower flange of the tape reel 2 (. Further, since the permanent magnet 19 is configured in a disk shape, the direction of the magnetic field and the magnetic flux density are stable even in the central part, and the magnetic force can be reliably applied to the magnetic tape T. Therefore, the magnetic tape Since a stable magnetic force is applied to T from the beginning to the end of winding, that is, from the core bone of tape reel 2 to the outside,
The tape is wound in an extremely good state, with the edges of the tape well aligned and tightly wound. In particular, even in a region where the tape behavior is unstable at the beginning of winding, the magnetic force acts reliably as described above, and the tape winding state can be maintained in a good condition.

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 not limited to the following: It can be set in consideration of various conditions such as speed) and the influence of the magnetic field on the magnetic tape T.

In the above embodiment, the winding rotation shaft 4 is driven through the heald 26, but the present invention is not limited to this. For example, the pulley 4C and the motor 2
Of course, the structure may be such that the pulley provided on one shaft is a gear.

Although the above embodiment describes an op reel winding system, the present invention is not limited to such a 641, but for example, a pair connected by a leader tape in the case of VH3 or Heta's videotape secondary. Needless to say, the present invention can also be applied to a so-called in-cassette winding method in which a magnetic tape is wound into a pre-stored tape winding body to finish a product. In addition, in the case of winding a tape wrapping body without a flange (a wrapping body consisting only of a core), the body portion 4b is configured to serve as a flange portion during winding, as shown in Fig. 10. By doing so, the winding appearance of a flangeless type tape wrapping body can be dramatically improved.

The present invention is not limited to the embodiments shown above, and as mentioned at the beginning, for example, a tape material wider than the product width is cut into tape material having a plurality of product widths and wound. It can also be applied in cases.

Although the winding device 1 has a structure in which the magnet is provided only at the winding rotating shaft 4, the present invention is not limited to this. It is also possible to provide magnets at appropriate locations and apply magnetic force in the tape width direction to suppress the deflection of the magnetic tape T in the width direction and stabilize the tape running performance.

Although permanent magnets were used as the magnets in the above embodiments, the present invention is not limited to this. (An electromagnet can also be used. In this case, by changing the amount of current flowing through the electromagnet, Magnetic force can be changed freely.

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 above in detail, the device of the present invention provides a drive shaft that rotates a tape reel at a location that can be called the inside of the shaft.
Since it is configured to include a magnet that pulls the magnetic tape, there is no need to provide a hole for the rotating shaft in the center of the magnet, and even in the core part (center part) of the tape reel, the tape end The magnetic force that acts to align the edges can be applied reliably. As a result, even in the region where the tape behavior is unstable at the beginning of winding of the magnetic tape, it is possible to obtain a tape winding appearance that is comparable to the regions other than the region.

Therefore, according to the present invention, the tape can be wound without damage to the tape edges or the magnetic surface (and the tape edges are aligned), and the productivity of the winding process can be improved. In particular, a winding device that employs an in-cassette winding method can be provided with a dramatically improved winding device.

Similar effects can also be obtained with a winding device using a flangeless type tape winding body.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view 1 of an embodiment of the winding device of the present invention.
．． Fig. 2 is a schematic side view thereof, Fig. 3 is an enlarged perspective view of the magnet shown in Fig. 2, Fig. 4 is an enlarged sectional view along the axial direction of Fig. 2, and Figs. 5 and 6 are respectively A schematic perspective view showing a part of a conventional winding device, FIG. 7 is a schematic plan view of a conventional winding device using an in-cassette winding method, FIG. 8 is an enlarged side view of the main part of FIG. 7, and FIG. The figure is a schematic sectional view showing a part of a conventional device, and FIG. 1... Winding device, 2.3... Tape winding body (tape reel), -4', 5... Winding rotation shaft, 4a...
・Engagement part, 4b... body part, 4C... pulley, 6.
... Raw fabric, 8... Pass system, 9... Cutting and joining means, 10... Leader tape, 11... Endless belt, 12.13.14.17... Rotating roller,
15... Belt, 16... Belt sending side, 18
...Belt winding side, 19...Permanent magnet, 20
... Support member, 21 ... Motor, 24 ... Roller 25 ... Collar, 26 ... Drive belt 27 ... Winding core. Figure 1 Figure 2 Figure 7 Figure 1 Figure 8 Figure 9 Figure 10 Otsu C Hand: ? 11iF SJ 1986 17/9 14th revision office good official Gui-゛de] C Yu IMK Tono 1,
jJI display Patent Application No. 123805 filed in 1985] 2. Title of the invention: Magnetic tape winding device 3. What is the relationship between the amendments and f1? vision 4,
Agent 6, Supplement 1 [Number of inventions 207,
Correction/Illustration: (1) “Detailed Description of the Invention” column of detailed circle (2) Figure 9 of the drawing

Claims (1)

[Scope of Claims] 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 width direction of the tape rotates the tape winding body to rotate the tape winding body. A magnetic tape winding device characterized in that the magnetic tape winding device is provided so as to intersect the rotation center line on the shaft side. 2) The magnet is configured in a disc shape having approximately the same diameter as the tape wrapping body, and a winding rotation shaft that rotates the tape wrapping body is rotatably provided so as to cover the magnet, and 2. The magnetic tape winding device according to claim 1, wherein the magnetic tape winding device is configured to be rotated by a driving means connected by a belt to the winding rotation shaft.