JPH0528700A - Standard-type data cartridge - Google Patents

Abstract

PURPOSE:To obtain the stable tape tension of a magnetic tape without the effect of the tension of a driving belt by specifying the outside diameter measure of a pair of corner rollers guiding the driving belt. CONSTITUTION:An outside diameter measure D3 in the pair of corner rollers 8a and 8b is adopted as 14, 0+ or -1, 0mm (which are smaller than 15, 5mm being the conventional outside diameter measure D1. Therefore, the rotation speed of the pair of corner rollers 8a and 8b becomes high for the decreasing portion of the outside diameter measure D3 when the magnetic tape is running so that the friction loss of the pair of corner rollers 8a and 8b increases. Then, the tension of the magnetic tape becomes high for the increasing portion of the friction loss of the pair of corner rollers 8a and 8b so that the stable tape tension of the magnetic tape is obtained without the effect of the tension of the driving belt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data cartridge for high density recording of CPU data, for example,
The present invention relates to a corner roller of a standard type data cartridge called 6000 type.

[0002]

2. Description of the Related Art Conventionally, as a data cartridge for high density recording of CPU data, for example, Japanese Patent Publication No.
Japanese Patent No. 14976 is known.

A conventional data cartridge of this type is shown in FIG.
Further, as shown in FIG. 4, the cartridge 1 is screwed onto a thin box-shaped upper cover 3 which is an upper half formed of a synthetic resin having a light transmitting property on a metal base plate 2 such as an aluminum plate which is a lower half. It is formed by stopping. A pair of left and right tape reels 4a and 4b are rotatably supported on the base plate 2, and a magnetic tape 5, which is a tape, is wound around the tape reels 4a and 4b. The magnetic tape 5 is guided by a pair of left and right tape guides 6a and 6b attached to the base plate 2 and is hung along the inside of the front wall 3a of the upper cover 3. A drive roller 7 and a pair of left and right corner rollers 8a and 8b are rotatably supported at substantially the center of the front edge of the base plate 2 and the left and right corners of the rear edge. An elastic drive belt 9 formed of a rubber belt or the like is wound between the drive roller 7 and both corner rollers 8a and 8b in a substantially T shape with strong tension. A pair of left and right drive portions 9a and 9b between the drive roller 7 of the drive belt 9 and the two corner rollers 8a and 8b are wound around the tape reels 4a and 4b. Winding part 5
It is pressed against the outer circumferences of a and 5b.

Both tape reels 4a, 4b and 3
The two rollers 7, 8a, 8b are rotatably supported by being inserted into the outer peripheries of the two support shafts 11 and the three support shafts 12 planted on the base plate 2 by these center holes 13, 14. , Grease 15 is placed in these center holes 13 and 14.
Is filled. Further, the drive belt 9 is the drive roller 7
And belt winding surfaces 71, 81 for self-centering which are integrally formed in a substantially drum shape on the outer circumferences of both corner rollers 8a, 8b.
Is wrapped around the outer circumference of.

Next, when the data cartridge is mounted on the recording / reproducing apparatus, the notch 18 formed on one side of the drive roller 7 on the front edge side of the base plate 2 and the upper cover 3 is opened and closed. The opening / closing door 19 attached between the base plate 2 and the upper cover 3 is opened in the direction of the arrow a as indicated by the alternate long and short dash line, and the magnetic head 20 on the recording / reproducing apparatus side is inserted into the cutout portion 18 to remove the magnetic field. Contact the tape 5. At the same time, a motor roller 21 such as a rubber roller, which is rotationally driven by a motor (not shown) on the recording / reproducing apparatus side, is inserted into the opening 22 formed in the front wall 3a of the upper cover 3 in front of the drive roller 7. Then, the motor roller 21 is pressure-bonded to the outer circumference of the large-diameter roller portion 72 integrally formed on the belt winding surface 71 of the drive roller 7. And
When the drive roller 7 is rotationally driven in the direction of arrow b by the motor roller 21 and the drive belt 9 is rotationally driven in the direction of arrow c, the drive units 9a and 9b pass through the tape winding units 5a and 5b. Both tape reels 4a, 4
b is driven to rotate in the direction of arrow d, and the magnetic tape 5 is moved to the direction of arrow e.
The magnetic head 20 records and reproduces data from the CPU on the magnetic tape 5 by traveling at a high speed of 25 to 120 in / sec.

In this type of data cartridge,
Due to the rotational load of both corner rollers 8a, 8b, a difference in running speed of both drive portions 9a, 9b of the drive belt 9 is generated, and a predetermined tape tension is generated between both tape guides 6a, 6b of the magnetic tape 5. In this way, good contact of the magnetic head 20 with the magnetic tape 5 is obtained.

In the conventional data cartridge of this type, both corner rollers 8a and 8b in the standard type data cartridge called 6000 type have an outer diameter D.
1 is 15.5 mm, inner diameter D2 is 4.0 mm and POM
A material formed of a material (polyacetal resin) was used.

[0008]

However, in the conventional data cartridge of this type, since the change in the tension of the drive belt 9 immediately affects the tape tension of the magnetic tape 5, the change over time due to long-term use and the high temperature. When the tension of the drive belt 9 is lowered due to use under the magnetic tape or the like, the tape tension of the magnetic tape 5 is lowered, and the magnetic head 20 is poorly contacted with the magnetic tape 5, resulting in a data recording / reproduction error. There was a problem that it would end up.

As a method of increasing the tape tension of the magnetic tape 5, there is also a method of increasing the tension of the drive belt 9, but the lateral pressure applied to the support shafts 11 and 12 becomes large, and the tape reels at the support shafts 11 and 12 portions. 4a, 4b and the rollers 7, 8a, 8b are apt to be seized, resulting in poor durability.

Therefore, the conventional data cartridge of this type has a problem that it is difficult to obtain a stable tape tension of the magnetic tape 5 without being affected by the tension of the drive belt 9.

The present invention has been made to solve the above problems, and provides a standard type data cartridge which can obtain a stable tape tension of a magnetic tape without being affected by the tension of a drive belt. It is intended to be provided.

[0012]

According to the standard type data cartridge of the present invention for achieving the above object, the outer diameter of the pair of corner rollers is from 15.5 mm of the conventional one to 1 mm.
The size is reduced to 4.0 ± 1.0 mm.

[0013]

In the standard type data cartridge of the present invention constructed as described above, the outer diameter of the pair of corner rollers is reduced from 15.5 mm of the conventional one to 14.0 ± 1.0 mm. The rotational speed of the pair of corner rollers can be made higher than before, the friction loss of the pair of corner rollers can be increased, and the rotational load of the pair of corner rollers can be increased. Then, since the pair of corner rollers rotate at high speed, the rotational force of the corner rollers becomes stable, so that the stable tape tension of the magnetic tape can be obtained without being affected by the tension of the drive belt.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a standard type data cartridge to which the present invention is applied will be described below with reference to FIGS. It should be noted that the same structural parts as those in FIG. 1B, FIG. 3 and FIG.

That is, as shown in FIG. 1A, the data cartridge of the present invention has a pair of corner rollers 8a,
8b has an outer diameter dimension D3 smaller than 15.5 mm which is the conventional outer diameter dimension D1 shown in FIG.
It is reduced to 0 mm. The inner diameter D2 is 4.0 mm, which is the same as the conventional one.

Therefore, the rotational speeds of the pair of corner rollers 8a and 8b during running of the magnetic tape 5 shown in FIG.
Since the outer diameter D3 is smaller, it is higher than before,
Friction loss between the pair of corner rollers 8a and 8b increases. The friction loss is determined by the relation of moments and is proportional to D2 / D3 in FIG. Therefore, since D1> D3, D2 / D3> D2 / D1.

Then, a pair of corner rollers 8a, 8b
A pair of corner rollers 8
Since the rotational load of a and 8b can be increased, the tape tension of the magnetic tape 5 can be increased. Then, since the pair of corner rollers 8a and 8b rotate at high speed, the rotational force of the pair of corner rollers 8a and 8b is stabilized, so that the magnetic tape 5 is stabilized without being affected by the tension of the drive belt 9. You can get tape tension.

Next, FIG. 2 shows the corner rollers 8a and 8b.
Outer diameter of 12.5mm, 14.0mm, 15.5m
7 is a graph showing the measured relationship with the tape tension of the magnetic tape 5 when it is formed in m. In addition, the tension of the drive belt 9 is usually 70 to 80 g immediately after the assembly of the data cartridge, and the tension is 60 after about 24 hours.
It becomes ~ 70g. Therefore, in the measurement, the tension of the drive belt 9 is set to 30 to 40 g in consideration of secular change due to long-term use and use under high temperature. And
The lower limit of the tape tension of the magnetic tape 5 is 28 g and the upper limit thereof is 98 g, but the ideal tape tension is 50 g or more and 90 g or less. The solid line of the graph shows the tape tension value of the tension MAX 40g of the drive belt 9, and the alternate long and short dash line shows the tape tension value of the tension MIN 30g.

From the measurement result, the corner roller 8
When the outer dimensions of a and 8b are 15.5 mm, the drive belt 9
When the tension of the magnetic tape 5 is 30 g, the tape tension of the magnetic tape 5 may be 50 g or less. When the outer diameter is 12.5 mm, the tension of the drive belt 9 is MAX40.
When g, the tape tension of the magnetic tape 5 is 100 g
If the outer diameter dimension is 14.0 mm, the magnetic tape 5 may have a different tension even if the tension of the drive belt 9 varies.
The tape tension of was within the ideal value of 50 to 90 g with a sufficient margin. Therefore, from this graph, the outer diameter dimension is 14.0 ± 1.0 mm (130-1
It turns out that 50 mm) is optimal.

[0020]

The standard data cartridge of the present invention is
Since it is configured as described above, the following effects are achieved.

By reducing the outer diameter of the pair of corner rollers from 15.5 mm of the conventional one to 14.0 ± 1.0 mm, the rotational speed of the pair of corner rollers during running of the magnetic tape is made higher than before. , The friction loss of the pair of corner rollers can be increased to increase the rotational load of the pair of corner rollers, and by rotating the pair of corner rollers at high speed, the rotational force of the corner rollers can be stabilized and driven. Since the stable tape tension of the magnetic tape can be obtained without being affected by the belt tension, the tape tension of the magnetic tape will decrease due to aging due to long-term use or use at high temperatures. As a result, it is possible to prevent the occurrence of poor contact of the magnetic head with the magnetic tape.

Since the tension of the drive belt can be lowered, the lateral pressure applied to the support shafts of the drive roller and the pair of corner rollers can be reduced to prevent seizure of the rollers and the like at the support shaft portion. The durability can be improved.

Since the tension of the driving belt can be lowered, the manufacturing conditions of the driving belt are widened and the productivity is improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an outer diameter dimension of a corner roller of a standard type data cartridge according to an embodiment of the present invention in comparison with a conventional one.

FIG. 2 is a graph showing the relationship between the outer diameter of the corner roller and the tape tension of the magnetic tape.

FIG. 3 is a partially cutaway plan view illustrating a data cartridge.

FIG. 4 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 4a, 4b Tape reel 5 Magnetic tape 5a, 5b Tape winding section 7 Drive roller 8a, 8b Corner roller 9 Drive belt 9a, 9b Drive section D3 Outside diameter of corner roller

Claims (1)

Claim: What is claimed is: 1. A drive roller, a pair of corner rollers, a drive belt wound between these rollers and driven by the drive roller, and a pair of magnetic tapes. And a pair of drive portions between the drive roller of the drive belt and the pair of corner rollers of the drive belt are pressed against the outer circumferences of the tape winding portions of the pair of tape reels. In a tape cartridge configured to rotationally drive a pair of tape reels, the outer diameter dimension of the pair of corner rollers is 14.0 ± 1.
Standard type data cartridge characterized by being set to 0 mm