JPS62281178A - Magnetic tape take-up device - Google Patents

Abstract

PURPOSE:To obtain an excellent tape winding state even at a tape behavior unstable region at the start of winding of a magnetic tape by providing a winding rotary shaft to a fixed shaft freely turnably and fixing the fixed shaft to the magnet. CONSTITUTION:The tip of the winding shaft 4 is constituted to be coupled with a tape reel 2 and the base has a pulley 4c and fitted to the fixed shaft 20 inserted to the center hole of the permanent magnet 19 freely turnably. In winding the magnetic tape T, the said 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, and since the permanent magnet 19 is formed as a disk prolonged up to the winding rotary shaft diameter inside and larger than the reel diameter, a stable magnetic force is exerted to the tape T from the start to the end of winding, and the tape side ridges are well arranged and the tape is wound tightly to show an 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 wrapping body onto another tape wrapping body, or when winding the magnetic tape in a wide range of conditions before making it into a raw material, or when the tape raw material 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 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. The process of winding a predetermined length of magnetic tape onto a tape winding body, the re-winding process of winding a magnetic tape once wound onto a tape winding body to rewind it onto another tape winding body, and even the process of rewinding the magnetic tape once wound 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 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. In other words, when the tape-wrapped body is observed from the axial direction, the winding (tape edge) becomes uneven, resulting in irregular winding. 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 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 high-density recording, such as video tapes, 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 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 heel 11 made of, for example, rubber, polyimide, etc., which is rotatably held by rotating rollers 12, 13, 14, rotates together with the magnetic tape T while the tape wrapping body 2 is rotated. The tape magnetic surface is elastically pressed relatively strongly in the radial direction of the magnetic tape T, so that the winding shape of the magnetic tape T is adjusted. 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 functions are not only subject to wear and tear, but also pose 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 the open winding method, in which the product is completed by inserting the decorative tape into the cassette after the above-mentioned decorative winding. There is a method called in-casset winding, C-0 winding, or ■-〇 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-case knot winder, and then wound around the leader tape on one side of the work (generally referred to as ■-0, C-0, etc.). The leading ends of the magnetic tapes to be removed are joined, 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 and cut the magnetic tape T of a predetermined length. This is a cassette tape winding method in which the end of the wound magnetic tape T is finally 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 poor. In this case, a roller 2 having upper and lower ribs 25 at the entrance of the cassette to improve the winding appearance.
Attempts have been made to force the tape to one side by placing a magnetic tape in the width direction as it is being wound, but applying strong force may damage the edges of the tape. In addition, weak force has little effect on improving the tape winding state, and there is no way to improve the tape winding state.

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 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 restricted by the shaft 30, so it is configured, for example, in a donut shape, the center part of which is hollow, and the lines of magnetic force are
At a location near the center of the flange 40, its direction is not constant and the magnetic flux density is small, making the force that attracts the magnetic tape T toward the flange 42 unstable and weak at the initial stage of the winding process. .

Furthermore, the winding appearance of the outer peripheral portion of the flange 42 is worse than that of the inner portion. This is because the outer diameter of the magnet 31 is approximately the same as the outer diameter of the flange 42, so the lines of magnetic force around the outer periphery of the magnet 31 are tilted and the force that attracts the magnetic tape T toward the flange is weakened. .

(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, magnetic tape has been developed that can dramatically improve the winding appearance of the in-cassette winding method, which previously had no improvement in the winding appearance, and the wide magnetic tape winding method used before the original tape. The object of the present invention is to provide a tape winding device.

(Structure of the Invention) The above-mentioned object of the present invention is to provide a magnetic tape winding device that rotates a tape winding body to wind a magnetic tape, in which a winding rotation shaft to which the tape winding body is attached and is rotationally driven is provided. This is achieved by a magnetic tape winding device which is rotatably held by a fixed shaft fixed to a magnet that generates a magnetic field approximately along the axis.

Hereinafter, the actual aS of the present invention will be explained 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 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 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 tape T fed out from the original tape 6 is wound onto the tape reel 2 through a path system 8 consisting of guide pins, guide rollers, etc. Also, in FIG. 2, the cutting and joining means 9 has been omitted.

Although the apparatus is similar to the conventional apparatus within the above-mentioned range, the feature of this embodiment lies in the apparatus portion of the tape reel 2. That is, the tape reel 2 that winds the magnetic tape T
A permanent magnet 19 is provided close to the magnet 19 .
A winding rotation shaft 4 is rotatably provided on a fixed shaft 20 attached to a fixed shaft 20 .

The structure around the winding rotation shaft 4 will be explained based on FIG. 4. As shown in the figure, the winding rotation shaft 4 is configured such that its tip portion engages with the tape reel 2, and has a pulley 4C at its base portion. The winding rotation shaft 4 is rotatably attached to a fixed shaft 20 inserted and fixed into a hole 19 at the center of a permanent magnet 19 (see FIG. 3).

The rotational force of the winding rotation shaft 4 is transmitted, for example, by a drive belt 26 mounted between a pulley 21a on the motor side provided on the rotation shaft of the motor 21 and a boo 'J4c on the winding rotation shaft 4 side. be done.

As shown in FIG. 3, the permanent magnet 19 has a shape that can be described as a circular disk, and its radius l is larger than at least the tape winding diameter, and the fixed shaft 20
The hole 19a for inserting and fixing the winding shaft 4 has a smaller diameter than the tip of the winding rotation shaft 4.

Further, the direction of the magnetic field (the direction of the lines of magnetic force) is generally along the tape width direction (direction along the axis of the winding rotation 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 as described above, the R'hTa tape T is pulled by the permanent magnet 19 and wound so as to be biased towards the lower flange of the tape reel 2. . In addition, since the permanent magnet 19 is approximately disk-shaped and extends to the inside diameter of the winding rotation shaft and is larger than the reel diameter, the direction of the magnetic field and the magnetic flux density are also controlled at the center portion and the outer circumferential portion of the tape reel 2. It is stable and can reliably apply magnetic force to the magnetic tape T. Therefore, a stable magnetic force acts on the magnetic tape T from the beginning to the end of winding, that is, from the core of the tape reel 2 to the outside, and the tape winding state is such that the tape edges are well aligned and secure. It is rolled and scratched and is in good condition. Especially in the area where the tape behavior is unstable at the beginning of winding, as well as in the outer periphery of the reel, the magnetic force with stable directionality and magnetic flux density acts reliably as described above, and the tape winding condition can be maintained in good condition. . The strength of the magnetic force of the permanent magnet 9 is not particularly limited, and includes, 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, the winding speed (tape running speed) can be set taking into consideration various conditions such as the influence of the magnetic field on the magnetic tape T.

In the embodiment described above, the winding drive shaft 4 is driven by the drive belt 26, but the present invention is not limited to this. For example, the winding drive shaft 4 is driven by the drive belt 26. Of course, a structure in which 21a is a gear may also be used.

In the embodiment described above, the disk-shaped permanent magnet 19 is provided on the front panel, but the present invention is not limited to this embodiment. For example, the front panel corresponding to the permanent magnet 19 is The portion may be made of a magnet.

Although the above embodiment describes an Opreel winding system, the present invention is not limited to such an embodiment. 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.

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

Although the winding device 1 has a structure in which the magnet is provided only at the winding drive shaft 4, the present invention is not limited to this. For example, the bus system 8 which is the running path of the magnetic tape T A magnet may also be appropriately provided at a location to apply a 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.

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.

Note that the term magnet in this specification is not limited to the permanent magnet described in the above embodiment, 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 is configured such that the winding rotation shaft is rotatably provided on a fixed shaft and the fixed shaft is fixed to a magnet, so that Compared to a device in which a magnet is provided around the winding rotation axis, the magnet can be easily positioned from near the outer periphery of the winding body to a position corresponding to the inside (center) of the winding core of the winding body. Magnetic force can be reliably applied to the winding core portion as well. Furthermore, by configuring the magnet to be large, the same effect can be achieved at the outer peripheral portion of the wrapping body. As a result, even in the region where the tape behavior is unstable, particularly at the beginning of winding of the magnetic tape, it is possible to obtain a tape winding appearance comparable to that in other regions.

Therefore, according to the present invention, it is possible to achieve a tape winding state in which there is no damage to the tape edges or damage to the 6N surface, and the tape edges are aligned, and furthermore, it is possible to improve the productivity of the winding process. Can be done. In particular, a winding device that employs an in-cassette winding system can be provided with a dramatically advanced device.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view 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 conventional magnets. 7 is a schematic diagram of a conventional winding device using an in-cassette winding system. FIG. 8 is an enlarged side view of the main part of FIG. 7. FIG. 9 is a conventional winding device. FIG. 2 is a schematic cross-sectional view showing a part of the device. 1... Winding device, 2.3... Tape winding body (tape reel), 4.5... Winding rotation shaft 4C121a...
・Pulley, 6... Original fabric, 8... Pass system, 9... Cutting and joining means, lO... Leader tape, 11... Endless belt, 12.13.14.17... Rotation Laura, 15
...Belt, 16...Belt sending side, 18...
・Belt winding side, 19...Permanent magnet, 19a...
・Hole, 20...Fixed shaft, 21...Motor, 2
4...Roller, 25...Brim 26...Drive belt. Figure 1 Figure 2 Figure 4 Figure 7 Figure 1 Figure 8 Figure 9/Procedure Neho Shojuku 1 July 1986 1'rli'lJTIm Official &! Drnf: IK Lord 1, Indication 11 of matter f1 (1 sum 61 zu 11! 'F application No. 123806 2,
Name of the invention: Magnetic Dave Winding System Translation 3, Supplement i]] Relationship with the master craftsman = 121 Applicant name: (!120) K<Dosha BIB Full/-S Stock Co., Ltd. 14. Agent I 1°〒100 Chiyo, Tokyo [18 Kasumigaseki 3-2-2 Fu!; 73 a;) is the post office in Kasumigaseki Building on the 29th floor J) Hakogumi No. 119 Unin'41;,'iha/+
FJs IZ door Ji6, 2nd year of invention increased by supplement n: 07, subject of amendment: (1) III sweep It i
! Column (2) Drawing (2) Fig. 9 in the section ``Detailed Description of the Invention'' has been amended as shown in the attached sheet. Figure 9

Claims (2)

[Claims] (1) In a magnetic tape winding device that rotates a tape winding body to wind a magnetic tape, a winding rotation shaft to which the tape winding body is attached and rotationally driven generates a magnetic field generally along the axis. A magnetic tape winding device characterized in that it is rotatably held on a fixed shaft fixed to a magnet. (2) The magnet is configured in the shape of a disk having a diameter larger than at least the tape winding body, and a pulley to which a drive belt is attached is provided at a location near the base of the winding rotation shaft. A magnetic tape winding device according to claim 1.