JPH01184773A - Method and apparatus for winding up magnetic tape - Google Patents

Abstract

PURPOSE:To improve winding posture and to improve the cleanness of the inside of a cassette case and a room by providing the title device with a pressure air supplying means for sending pressure air from a reel shaft insertion hole into the case and an air sucking means for sucking the pressure air. CONSTITUTION:When a driving shaft 4 is rotated and a magnetic tape T wound around at the time of pressing friction sheets 11, 12 on both upper and lower sides into the case by pressure air, the upper and lower end edges of the magnetic tape T wound around a hab 2 are wound by both friction sheets 11, 12 so as to be held between the sheets 11, 12 by proper power. Thereby, the winding position and winding posture of the magnetic tape T around the hab 2 are extremely improved. In addition, dust in the cassette case 8 and foreign matters such as magnetic powder stuck to the tape T can be blown away to the outside of the cassette case 8 by the pressure air and the inside of the cassette case 8 can be held at a clean state. Consequently, the improved winding posture can be obtained and the insides of the cassette case 8 and the room can be prevented from being deteriorated at their cleanness.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and device for winding a magnetic tape.
In particular, the present invention relates to a magnetic tape winding method and apparatus for winding a magnetic tape onto a flangeless type tape winding body such as an audio tape cassette or a digital audio cassette.

(Prior art) In the manufacturing process of audio tape cassettes and digital audio chip cassettes, as an intermediate step, a long magnetic tape is rolled onto a small flangeless type tape wrapping body such as a reel or hub to a predetermined length. The process includes winding up magnetic tape.

When the magnetic tape is wound onto the tape winding body in this winding 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, and furthermore, the magnetic tape Depending on 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, resulting in problems with the winding state of the wound magnetic tape. That is, when observed from the axial direction of the tape-wrapped body, the tape winding is disordered and the tape ends are uneven.

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.

For this reason, in the conventional magnetic tape manufacturing process, after the winding process, all rolls are inspected by visual inspection, etc., and the cost and time required for this is a major factor in the magnetic tape manufacturing process. It was a bottleneck.

In addition, it is necessary to reduce this inspection load (in order to improve the winding appearance, when winding magnetic tape with a low yield of good winding shapes, an open winding method as shown in Fig. 7 has conventionally been used).
A method called "camp makeup roll" is adopted.

FIG. 7 is a schematic perspective view showing the vicinity of the tape winding body 2 on the winding side.

In the case of the one shown in FIG. 7, the winding shaft 4 and the winding shaft 4
A flangeless type tape wrapping body is placed on the rotary table 14 integrated with the rotary table 14, and the weight of the cap 15 placed on the upper edge of the tape winding body moves the magnetic tape T toward the rotary table side. This is a method of winding the tape T so that both ends of the tape are aligned and the tape T can be wound in a neat manner.

However, in the case of this open winding method, the magnetic tape T
Since there is a step of assembling the tape-wrapped body into the cassette case, there is a high risk of damage to the tape, and furthermore, the cassette assembly is not easy. Therefore, in addition to the open winding method in which the product is completed by inserting the decorative tape into the cassette after performing the decorative wrapping, there is another method in which the magnetic tape is wound at the final stage of the cassette assembly process. Incas set winding or C-0 winding, v
- There is a method called 〇 winding.

In this method, as shown in Fig. 8, all parts except the magnetic tape are assembled in advance in a cassette 8, and the tape winding body on the sending side and the tape winding body on the winding side, connected by a leader tape IO, are inserted and screwed together. After the workpiece has been tightened (generally referred to as V-O, C-〇, etc.), the leader tape is pulled out and cut using a winding device called an in-cassette winder, and then a magnetic tape is applied to wind the leader tape on one side of the workpiece. The ends of the tapes are joined, the other leader tape is held by the suction member 16, and the tape winding body 2 on the joined side is rotated, and a predetermined length of magnetic tape T is
This is a cassette tape winding method in which the magnetic tape T is wound and cut, and finally the end of the wound magnetic tape T is joined to the other leader tape 10 to complete the product. Although this in-cassette winding method has excellent productivity,
As with the above-mentioned decorative cap roll, it is impossible to come into contact with the magnetic tape, and the quality of the roll depends on the physical properties of the tape and variations in the cassette parts, which cannot be controlled at all, and the roll appearance is extremely poor. . In particular, when the tape wrapping body is a flangeless type, it is very difficult to adjust the winding appearance.

Therefore, in order to solve the above problems, the applicant of the present application proposed a magnetic tape force center having a pair of flangeless type hubs and a friction sheet, as shown in Japanese Patent Application No. 62-034660. When winding an in-cassette, by sending pressurized air into the cassette case,
By pressing the friction sheet against the edge of the magnetic tape, we were able to suppress tape behavior and obtain a dramatically improved winding appearance.

(Problems to be Solved by the Invention) However, in the above winding method, a new problem has arisen due to the pressurized air sent into the cassette case.

In other words, it has been found that the dust blown out of the case by pressurized air deteriorates the cleanliness of the chamber, and that the blown dust adheres to the magnetic tape, deteriorating the electromagnetic conversion characteristics. .

SUMMARY OF THE INVENTION In view of the above problems, the present invention has been developed to improve the winding appearance of a magnetic tape in an in-cassette winding system and to maintain good cleanliness inside the cassette case and inside the room. An object of the present invention is to provide a method and apparatus for the method and apparatus.

(Means for Solving the Problems) The above object of the present invention is to provide a cassette case which incorporates a pair of flangeless type tape wrapping bodies connected by a leader tape and at least one friction sheet in contact with the edge of the tape. In the method of winding magnetic tape,
When rotating the tape winding body to wind up the magnetic tape, pressurized air is sent into the cassette case, and the pressurized air presses the friction sheet against the edge of the tape, and at the same time A magnetic tape winding method characterized by winding the discharged pressurized air while sucking it near the cassette case, and a device that makes the method possible, namely, a pair of flangeless tapes connected by a leader tape. In a magnetic tape winding device that winds a magnetic tape around a cassette case that has a built-in tape winding body of the type and at least one friction sheet that contacts the edge of the tape, a reel shaft is inserted into the case from at least one reel shaft insertion hole of the cassette case. This is achieved by a magnetic tape winding device characterized by comprising a pressurized air supply means for feeding pressurized air into the cassette case, and an air suction means for sucking the pressurized air discharged from the front of the cassette case.

(Embodiments) Hereinafter, embodiments of the apparatus of the present invention will be described based on the drawings.

1 and 2 are a schematic front view and a side view from the direction of arrow A of an embodiment of an in-cassette winding type magnetic tape winding device. This winding device 1 winds a magnetic tape T into a pair of tape winding bodies 2 and 3 (hereinafter simply referred to as "hub") that are stored in advance in a case of a digital audio tape cartridge, for example, to produce a product. It is used in the finishing method.

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

A cassette case 8 containing hubs 2.3 connected by a leader tape 10 having a predetermined length is loaded into a cassette holder 20 of the winding device 1. This cassette holder 2
0 has almost the same structure as a packet for a cassette case of a recording/reproducing device. For example, as shown in FIG. Then, it is held in the holder by a locking member 21 provided at a suitable position at the lower end of the holder.

At this time, the guard panel 8a that closes the cassette front opening of the cassette case 8 is rotatably unlocked. That is, a slide guard 8b, which is slidably provided on the bottom surface of the cassette case 8 and also serves to prevent the guard panel from opening, slides toward the rear of the cassette when the cassette case 8 is inserted.

After that, the cassette holder 20 supported by, for example, a four-wood slide shaft 23 is moved to, for example, two air cylinders 2.
4 toward the front panel la side (in the direction of arrow B), the drive shaft 4 and the shaft 5 are inserted into the hubs 2 and 3 from the reel shaft insertion opening 8c of the cassette case 8. At this time, for example, the guard panel 8a is pushed up and opened by a guard panel rotation lever 22 fixed to the front panel 1a so as to correspond appropriately to the guard panel 8a, and the leader tape 10 connecting the hubs 2 and 3 is exposed. do.

Thereafter, the leader tape 10 is cut approximately at the center, and the end on the hub 2 side and the tip of the Gfi tape material 6 that has been attached in advance are joined with a joining tape or the like. Then, after the magnetic tape T wound around the hub 2 to a predetermined length is cut, its end portion is joined to the leader tape 10 on one hub 3 side.

Cutting of the leader tape 10 and the magnetic tape T and joining of the leader tape 10 and the magnetic tape T are performed using a cutting and joining means 9 provided with holding members 10a and lOb at the tape ends, a cutter for cutting, joining tape, etc. The magnetic tape T sent out from the original tape 6
is wound onto the hub 2 through a path system consisting of guide pins, guide rolls, etc.

Then, the magnetic tape T is attached to the leader tape 10 on the hub 3 side.
After joining and completing the desired winding, the cassette holder 20 is moved by the air cylinder 24 in the direction C (opposite to the direction B) in the figure. This movement causes the drive shaft 4 and hub 2 to
At the same time that the engagement between the shaft 5 and the hub 3 is released, the guard panel 8a closes the front opening of the cassette again. After that, the locking member 2 that was holding the cassette case 8
1 moves backward to the back side of the cassette holder, and the cassette case 8 is taken out from below the holder.

Note that the cutting and joining means 9 is omitted in FIGS. 2 and 3.

Although the device is similar to the conventional device within the above-mentioned range, the structure and operation of the characteristic parts of one embodiment of the present invention will be explained below with reference to FIGS. 4 and 5. In addition, in FIG. 4 and FIG. 5, the above-mentioned cassette holder 20
The cutting and joining means 9, etc. are omitted for convenience. Fourth
The figure shows the drive shaft 4 and shaft 5 inserted into the hub 2.3 in the cassette case 8, rotating the hub 2.3 by a drive means such as a motor (not shown) to wind up the magnetic tape. It is a schematic perspective view. The shaft 5 is configured to be hollow,
One end thereof is connected to a pipe 30 connected to, for example, a pressure pump (not shown), and constitutes pressurized air supply means for feeding pressurized air into the cassette case 8. Incidentally, the drive shaft 4 and the shaft 5 can be provided with a well-known rotary joint or the like so that the hub can be rotated while appropriately feeding pressurized air. Further, a suction member 25 is disposed in front of the cassette case 8.

The suction member 25 is hollow and has an opening 28 facing the tape outlet 29 on the front surface of the cassette case 8 . The opening 28 is connected by a nozzle 26 to a pipe 27 whose one end is connected to, for example, a vacuum pump (not shown), and an air suction means for sucking air discharged from a tape outlet 29 in the front of the cassette case 8. It consists of

When air is blown into the cassette case 8 by the pressurized air supply means, the air discharged from the tip of the shaft 5 first hits the upper wall surface of the inner wall of the case opposite to the tip of the shaft 5, and moves along the upper wall surface to generate friction on the upper side. It spreads in all directions inside the sheet 11 (between the wall surface and the friction sheet 11). At this time, since the upper friction sheet 11 has flexibility, it is pressed by the pressurized air so as to curve appropriately inward of the case. The air that has flowed along the upper wall surface flows along the side wall surface of the cassette case 8, and then flows along the bottom wall surface, causing the lower friction sheet 12 to pass through the case in the same manner as the upper friction sheet 11. Press inward to open the tape outlet 2 on the front of the cassette case 8.
Go out of the case from 9 onwards.

The air discharged from the tape outlet 29 is sucked in through the opening 28 by the air suction means, and is discharged outside through the pipe 27. Further, the sucked air may be discharged indoors after removing dust and the like from the air using an air purification device such as an air filter.

As mentioned above, when the drive shaft 4 is rotated to wind up the magnetic tape T while the friction seams 1 and 12 on both the upper and lower sides are being pressed inward by pressurized air, the magnetic tape T is wound around the hub 2. Since the tape T is wound so that its upper and lower edges are sandwiched between the friction seams 11 and 12 with appropriate force, the winding position and winding appearance of the magnetic tape T relative to the hub 2 are improved. . Moreover, the pressurized air can blow away foreign matter such as dust and magnetic powder attached to the tape inside the cassette case 8, and the inside of the cassette case can be kept clean. In addition, since the air containing dust discharged from the tape outlet 29 is discharged outside by a suction means or purified by an air purification device and discharged indoors, the cleanliness of the room may be deteriorated or the air containing dust may This prevents the contents from being sent into the cassette case.

Note that the wind pressure and air flow rate of the pressurized air are not particularly limited; for example, the tape winding speed, friction seam H
It can be set as appropriate depending on various conditions such as the thickness, hardness, slipperiness, etc. of 1 and 12, and the internal structure of the cassette case. Further, the suction amount of the suction means can also be appropriately set to such an extent that it does not interfere with the bending action of the friction sheet.

Furthermore, by providing nozzles at a plurality of locations on the suction member 25, the suction efficiency can be further increased by configuring the suction member 25 to suck exhaust air from a plurality of locations.

In the present invention, the suction member does not necessarily have to be provided facing the front surface of the cassette case, and the arrangement can be changed as appropriate so as not to interfere with the operation of the cassette holder, cutting and joining means, etc.

Although the above embodiments have been described with respect to digital audio tape cassettes, the present invention can of course also be applied to Philips type audio tape cassettes, as stated at the beginning, and the present invention can be applied to various types of audio tape cassettes based on the gist of the present invention. Needless to say, the following modifications are possible.

Examples of the present invention will be described below.

(Example) A digital audio tape cassette was used as a magnetic tape cassette, and an in-cassette winding having a suction structure as shown in FIG. 4 was carried out, and the amount of dust generated near the tape outlet was measured. The results are shown in Figure 6.

In the above embodiment, the upper friction sheet is made of polyethylene terephthalate and has a thickness of 50 μm.
The lower friction sheet was made of ultra-high molecular weight polyethylene and had a thickness of 80 μm. In addition, the blowing pressure of the pressurized air was 1.5 kgf/Ca, the suction pressure of the suction means was 5 kgf/c+a, and the tape speed was 10 kgf/ca.
The test was carried out under the conditions of m/s.

Further, as a measuring method, the magnetic tape winding device of the present invention was brought into a clean room (cleanliness class 1000), and a dust measuring nozzle was installed near the tape outlet 29 shown in FIG. Then, the dust while winding the magnetic tape T was constantly counted, and the dust was measured 10 times in total, with and without suction.

As is clear from FIG. 6, in the magnetic tape winding device equipped with the suction device according to the present invention, the amount of dust generated near the cassette tape case is extremely reduced.

(Effects of the Invention) As described above, according to the present invention, when performing in-cassette winding of a magnetic tape cassette that has a pair of flangeless type hubs and is provided with a Frixigin sheet,
By feeding pressurized air into the cassette case, the friction sheet is pressed against the edge of the magnetic tape, so it is possible to suppress theta behavior and obtain a dramatically improved winding shape. Foreign matter such as dust inside the cassette case is blown out of the cassette case, and the pressurized air discharged from the cassette case is sucked in by the suction means and discharged to the outside or cleaned, which may deteriorate the cleanliness of the room. Air containing dust can be prevented from being sent into the cassette case.

Therefore, it is possible to obtain a magnetic tape cassette which is free from various troubles such as tape winding curls and scratches at the tape ends, and which also has good electromagnetic conversion characteristics.

[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 seen from the entrance direction of Fig. 1, and Fig. 3 is a cassette holder and magnetic tape cassette shown in Fig. 1. Figures 4 and 5 are perspective views and cross-sectional views of the main parts of the device shown in Figures 1 and 2, and Figure 6 is a measurement of the amount of dust generated during winding of the in-cassette set. Distribution map showing the results,
FIG. 7 is a partial perspective view showing a conventional open winding system, and FIG. 8 is a schematic plan view showing a conventional in-cassette winding system. (Symbols in the diagram) 1... Winding device 2.3... Tape winding body (hub) 4... Drive shaft 5... Shaft 6... Raw material 8... Cassette case 8a
...Guard panel 8b...Slide guard 8C.
... Reel shaft insertion hole 9 ... Cutting and joining means 10 ... Leader tape 1
0a, 10b...Holding member 11.12...Flixibon seat 14...Rotary table 15...Cap 16...
・Adsorption member 20...Cassette holder 21...
Locking member 22... Guard panel rotation lever 23... Slide shaft 24... Air cylinder 2
5... Suction member 26... Nozzle 27.30.
...Pipe 28...Opening 29...Tape outlet (3 idiots) ε5 3 Figure 1 Figure 2 Figure 4 Prisoner Figure 5 Figure 6

Claims (1)

[Claims] 1) A method for winding a magnetic tape in a cassette case incorporating a pair of flangeless type tape winding bodies connected by a leader tape and at least one friction sheet in contact with the edge of the tape, When rotating the tape winding body to wind up the magnetic tape, pressurized air is sent into the cassette case, and the pressurized air presses the friction sheet against the edge of the tape, and at the same time A magnetic tape winding method characterized in that the discharged pressurized air is wound while being sucked near the cassette case. 2) In a magnetic tape winding device that winds a magnetic tape in a cassette case that incorporates a pair of flangeless type tape winding bodies connected by a leader tape and at least one friction sheet in contact with the edge of the tape, the cassette The cassette case is characterized by comprising a pressurized air supply means for feeding pressurized air into the case from at least one reel shaft insertion hole of the case, and an air suction means for sucking the pressurized air discharged from the front of the cassette case. A magnetic tape winding device.