JPS5827574B2 - nettensha sochi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal transfer device that can continuously transfer recorded signals on a recording sheet (hereinafter referred to as master sheet) to unrecorded tape (hereinafter referred to as copy tape).

Normally, thermal transfer on magnetic tape involves heating the copy tape to a predetermined temperature above the cue temperature, and then lowering the copy tape to a predetermined temperature so that the magnetic surfaces of the mask-tape come into contact with each other. , and is inserted between a pair of transfer rollers that roll into contact with each other.

On the other hand, in recent years, with the spread of magnetic sheets, thermal transfer has also come to be performed. However, in the case of thermal transfer of magnetic sheets, unlike magnetic tape, one of the transfer drum and transfer roller that rolls into contact with each other is used. The master sheet is wound around and held on the transfer drum, and in this state, the copy tape heated to a predetermined temperature is continuously fed between the transfer drum and the transfer roller, and the copy tape and master sheet are pressed together to form the master sheet. Recorded signals are continuously transferred to copy tape.

Note that after the transfer, the copy tape is cut into a specified length to obtain a copy sheet.

However, in this case, in order to accurately transfer the recording signal of the master sheet to a predetermined position on the copy tape, the master sheet must be wound around the transfer drum with high precision positioning, and the master sheet must be tightly wound without loosening. must be equipped.

In view of the above-mentioned points, the present invention provides a thermal transfer device for magnetic sheets that can easily and accurately wind a master sheet onto a transfer drum and perform good transfer. be.

An example of a thermal transfer device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a layout diagram of essential parts showing an example of a magnetic sheet thermal transfer apparatus according to the present invention, in which 1 represents a copy tape and 2 represents a master sheet.

Reference numeral 3 indicates a transfer drum made of a metal or the like having good thermal conductivity, and 4 indicates a transfer roller having an elastic body 5 such as rubber or polyethylene fitted around the outer periphery. These drum 3 and roller 4 are driven in rolling contact with each other. Further, the master sheet 2 is wound on the outer peripheral surface of the drum 3 with its magnetic surface facing up.

During the transfer of the copy tape 1, a heating means, for example, a heating lamp 6, for heating the copy tape 1 to a predetermined temperature higher than the cueing temperature is disposed at a position before the contact point between the transfer drum 3 and the transfer roller 4. Ru.

Reference numeral 7 denotes a dust removal device using air suction, which is disposed around the outer periphery of the transfer drum or transfer roller.

The copy tape 1 is then passed from a supply reel through a predetermined path (not shown), heated by a heating lamp 6 to a predetermined temperature higher than the cueing temperature, and is then sent between a transfer drum 3 and a transfer roller 4 within a range of an angle φ. The recording signal of the master tape 2 is continuously transferred to the copy tape 1, which is then wound onto a take-up reel (not shown).

In addition, in order to perform suitable thermal transfer, it is necessary to lower the temperature of the magnetic layer of the copy tape 1 from above the cue temperature to about 70'C between the angle φ where the master sheet 2 and the copy tape 1 are in close contact. .

By the way, since the outer periphery of the transfer roller 4 is made of an elastic body 5 made of rubber or polyethylene with low thermal conductivity in order to make good pressure contact with the transfer drum 3, the cooling effect from the transfer roller 4 is poor, and the copy tape 1 It is difficult to cool down to the required temperature.

Therefore, in this example, the transfer roller is well cooled through the cooling belt means 8, and at the same time, it is earlier than the transfer start time of the copy tape 1 and the master tape 2 by a time t1, and therefore the angle θ The copy tape 1 is brought into contact with the transfer roller 4 in advance over a range of .

In this case, the cooling within the range of angle θ is done so that the temperature of the base of the tape 1 is lowered without lowering the temperature of the magnetic surface of the copy tape 1 too much, and through this, the temperature of the magnetic surface is lowered to an appropriate temperature. do.

For example, in the case of a copy tape using a polyethylene terephthalate I base with a thickness of 40μ, jl = 4mse
Even if it is c, the temperature drop in the magnetic layer is less than about 10%.

Therefore, for example, the base surface of the copy tape should be brought into contact with the transfer roller from t 1-4 m5ecl, L above the beginning of contact between the master tape and the copy tape, so that the thermal conductivity of the transfer roller is lower than the thermal conductivity of the tape base. It is possible to forcefully cool the transfer roller by increasing the temperature by more than twice as much.

In the present invention, in particular, the transfer drum 3 is formed with a porous region 9 at a required portion of the surface of the drum 3 as shown in FIG. is evacuated and the master sheet 2 is brought into close contact with the drum surface.

This porous region 9 is the winding start portion 9A of the master sheet.
It is possible to form the winding end portion 9B and the upper and lower peripheral edge portions 9C and 9D in the width direction of the sheet. For example, when the drum 3 is made of the same metal material, the portions 9A to 9B can be formed.
It can be formed by drilling a large number of pores in 9D.

Further, the porous region 9 can also be formed of another material such as sintered metal.

It is desirable that each pore of the porous region 9 be formed in a radial direction from the drum surface, and that adjacent pores are not laterally connected to each other.

However, a porous material interconnected vertically and horizontally, such as sintered metal, may also be used.

In this case, the porous portions 9C and 9D at the upper and lower ends are formed so as to be located outside the tape width l just when the copy tape 1 is rolled.

At the lower end of the drum 3, there is a flange 11 that protrudes slightly outward from the outer circumferential surface on which the sheet is wound, and uses the upper cylinder as a guide reference surface 10.
form.

Further, the rotating shaft 12 of the drum 3 is provided with a circulation hole 13 through which cooling water for cooling the drum 3 flows.

Further, on the back side of each porous portion 9A to 9D, a groove 14 communicating with a vacuum pump 15 is formed as shown in FIGS. 3 and 4.

In this case, the suction groove 14 can be formed in parts so that even if a part of the sheet 2 wound around the drum 3 separates, other parts are reliably suctioned.

In the illustrated example, the groove 1 corresponds to the portion 9A at the beginning of sheet winding.
The grooves 14B and 14C corresponding to the surrounding porous parts 9C and 9D including the end part 9B of sheet winding are each divided into four parts, and the groove 14A facing the beginning part of the sheet is divided into four parts. 16A to the vacuum pump 15, and the other four grooves 14a, 14b, 14c and 1
4d (each divided groove is in communication with each other) is connected to the common pipe 16 through the communication holes 17a to 17d, respectively.
It is connected to the vacuum pump 15 through B.

In this case, the hole diameter of the portion of each communication hole 1γa to 17d in contact with the pipe 16B is made smaller, and even if some porous portions are opened, the air resistance increases in the portion with the narrower hole diameter, and excessive air resistance from the open portion increases. It is possible to prevent the outflow of air and avoid the influence on other parts.

On the other hand, a master sheet setting means 18 is arranged so as to be close to and away from the drum 3 and can be used when winding the master sheet 2 onto the drum 3.

This means 18 has a set roller 19 that rotates toward the reference surface 10 at a position close to the reference surface 10 of the drum 3, and has a friction body 20 at the upper end.

Next, the procedure for winding the master sheet 2 around the drum 3 will be explained.

First, hold the master sheet 2 so that its pace side is on the drum side, so that the winding start end of the sheet is aligned with the center line C- in Fig. 2.
Place it on the surface of the drum so that it is at C'.

Next, open the cocks 21A and 21B of the vacuum pump 15,
Strong suction is applied simultaneously through each tube 16A, 16B.

At this time, first of all, the sheet winding starts and the end part is the porous part 9.
The master sheet 2 is adsorbed by A, and then the master sheet 2 is moved along the surface of the drum while rotating the drum 3, so that the sheet is brought into close contact with the porous portions at the upper and lower ends.

Stop the rotation of the drum at a position where the winding end of the sheet overlaps the winding start end of the sheet (see Figure 5), and at the same time reduce the suction of the vacuum pumps of both tubes 16A and 16B. do.

At the same time, the setting means 18 is moved toward the drum, and the friction body 20 and the setting roller 19 are brought into rolling contact with the master sheet 2.

In this state, the set roller 19 is rotated to bring the lower edge of the sheet 2 into contact with the reference surface 10 of the drum 3.

At this time, since the suction force is weakened, the sheet 2 can be easily moved.

Next, the setting means 18 is separated from the drum 3, and then the drum 3 is rotated approximately 40 degrees. At that point, the setting means 18 is brought into contact with the drum 3 again, and the setting roller 19 is similarly moved to the lower end of the sheet 2. The edge is brought into contact with the reference surface 10.

This process is repeated in sequence until near the end of sheet 2.

With the lower edge of the entire sheet aligned with the reference surface 10 of the drum 3, the pumps of the tubes 16A and 16B are again strongly sucked to fix the sheet 2.

Furthermore, due to differences in the thickness or elasticity of the base of the master sheet, for example, after winding the sheet onto the drum 3, when the suction of the vacuum pump is weakened, the end of the sheet may separate from the drum or the sheet may become loose on the drum. There is.

To do this, for example, first, the sheet is rolled up while rotating the drum, and then the end of the sheet is temporarily secured using a fitting spring 22 as shown in FIG. 6, and finally the sheet 2 is wound. This may be removed when completed.

Alternatively, if the sheet loosens on the drum, after accurately setting the lower end of the winding start portion of the sheet on the reference surface 10, strongly suck only the pump 15 on the pipe 16A side, and then turn on the setting means 18. Move the set roller 19 and the friction body 20 to the drum side and bring them into contact with the master sheet 2,
As a result, the drum 3 is slowly rotated, the set roller 19 is rotated at the same time, and both rotations are stopped near the end of the sheet 2.

In this state, the pump 15 on the pipe 16B side also applies strong suction to fix the sheet.

In this case, the set roller 1 is rotated simultaneously with the rotation of the drum 3.
9 is rotated, the sheet receives frictional tension in the longitudinal direction, and the slack in the sheet is eliminated.

As for the frictional force in the width direction of the sheet, the frictional force between the set roller 18 and the sheet 2 is selected to be larger than the sum of the frictional force between the sheet 2 and the friction body 20 and the frictional force between the sheet 2 and the drum 3. put.

Further, the width of the master sheet 2 used here is wider than that of the copy tape 1.

That is, since the upper and lower edge portions of the master sheet 2 that are attracted by the drum and the portions that come into contact with the set roller tend to damage the magnetic surface, it is desirable that no signal tracks be formed there.

For this purpose, increase the width of the master sheet.

Note that thermal transfer of audio signals distorts the transfer signal waveform and deteriorates the S/N ratio, so when thermal transfer of video signals is performed, only the audio signal is reproduced from the master sheet through a magnetic head, and then reproduced on the specified track of the copy tape. May be recorded.

At this time, if you can increase the width of the master sheet and increase the audio track width of the master sheet, the S/N
This means that good playback records can be made.

According to the above-mentioned configuration, in a magnetic sheet thermal transfer device, a porous portion is formed in advance on the drum around which the master sheet is wound, and a flange portion 11 having a reference surface 10 is formed in the f portion of the drum 3, and the master sheet is When winding the sheet 2, the lower end of the sheet 2 is brought into contact with the reference surface 10 through vacuum suction through the porous portion and a set roller, so that the sheet 2 can be wound accurately at a predetermined position.

In particular, since the magnetic sheet is brought into close contact with the drum surface by applying a vacuum, there is no dust or air layer between the surfaces of the sheet 2 and the drum 3, so that the magnetic sheet is securely held and wound at a predetermined position by the reference surface.

Also, since the master sheet is vacuum-adsorbed, there is no misalignment of the master sheet even during transfer.

Further, since the drum 3 is constantly cooled by the cooling water in the flow holes 13, the master sheet is cooled through this drum, and good transfer can be performed.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a layout diagram showing an example of a thermal transfer device according to the present invention;
FIG. 2 is a partially sectional front view showing an example of the transfer drum, FIG. 3 is a view showing the inside of the transfer drum in FIG. 2, and FIG.
The figure is a cross-sectional view taken along line A-A in Figure 3, Figure 5 is a plan view showing the state of winding of the magnetic sheet, and Figure 6 is a view of the main parts showing another example of the state of winding of the magnetic sheet. be. 1 is a copy tape, 2 is a master sheet, 3 is a transfer drum, 4 is a transfer roller, 6 is a heating means, 9 is a porous area,
10 is a guide reference surface, 15 is a vacuum pump, and 18 is a sheet setting means.

Claims (1)

[Claims] 1. A transfer drum and a transfer roller that roll into contact with each other, a recording sheet is wound around the transfer drum, and an unrecorded tape heated to a predetermined temperature is inserted between the transfer drum and the transfer roller to form the recording sheet. In a thermal transfer device configured to transfer recorded signals of 1 to the unrecorded tape, a porous portion is provided on the outer peripheral surface of the transfer drum and a guide reference surface is provided, and the recording sheet is transferred through an auxiliary roller. The thermal transfer device is configured to be guided by the reference surface and closely fixed to the outer circumferential surface of the transfer drum by suction from the porous portion.