JPH05202376A - Lubricant and type cassette - Google Patents

Abstract

PURPOSE:To obtain the subject tape cassette capable of satisfying required initial driving power and initial tension characteristics and maintaining the characteristics even in running durability. CONSTITUTION:The objective tape cassette uses a lubricant prepared by blending a grease containing a synthetic oil as a base oil with at least 20-50% solid lubricant in at least corner roller parts 2 and 3 of a driving roller part 1 and the corner roller parts 2 and 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricant suitable for application to a rubber / plastic lubricant used for sliding parts of shafts and plastic rollers, and a tape cassette using the same.

[0002]

2. Description of the Related Art Conventionally, rubber and plastic lubricants have been often used for plastic gears, shafts and plastic roller sliding parts, etc. in each machine structure. Characteristics such as torque, motion torque, and durability were important points.

As a guide for selecting a lubricant, first, the initial torque value is important, and then the durability is often examined. When conducting such a study on commercially available rubber / plastic lubricants, first of all, as for the initial torque, various kinds of lubricants with various torque values are supplied, and the lubricant is selected only based on the initial torque value. Can be easily determined.

On the other hand, in the structure of the tape cassette, a lubricant for rubber / plastic is often used for the shaft and the sliding portion of the plastic roller.

In order to ensure the running durability of this tape cassette, it is a major point to use an excellent lubricant.

[0006]

However, when a lubricant is selected by the above-mentioned method and its durability is examined, torque deterioration due to continuous movement, torque deterioration due to environmental changes, etc. occur. As a result, it becomes very difficult to select the optimum lubricant.

On the contrary, even if a lubricant having excellent durability is selected, the initial torque is too high or too low, and it is very difficult to obtain the required torque.

On the other hand, the tension and torque of the tape cassette are greatly influenced by the characteristics of the lubricant, and depending on the kind of the lubricant, the characteristics may be greatly impaired during long-time running or bad environment running. There is a problem in that the characteristics of the lubricant used must be fully considered.

[0009] At present, most of the lubricants used for the rotary sliding parts of the tape cassette are greases containing a thickener and the like as the base oil. There is also a type in which a solid lubricant is blended with this grease to improve durability and extreme pressure, but the blending amount of the solid lubricant is 5% to 10%.
It is usually as low as%.

The present invention has been made in view of the above problems, and an excellent lubricant capable of easily adjusting the initial torque and maintaining the initial performance even when used for a long time is obtained. The purpose is to Further, the present invention satisfies the required initial tension and torque characteristics, and
It is an object of the present invention to obtain an excellent tape cassette that maintains its characteristics in running durability.

[0011]

The lubricant of the present invention comprises at least 20% of a solid lubricant in a grease containing a synthetic oil as a base oil.
~ 50% blended. Further, the tape cassette of the present invention, as shown in FIG.
In addition, among the corner roller portions 2 and 3, at least the corner roller portions 2 and 3 use a lubricant in which grease having a synthetic oil as a base oil is mixed with at least 20% to 50% of a solid lubricant.

[0012]

According to the lubricant of the present invention, the initial torque can be easily adjusted by blending the low molecular weight tetrafluoroethylene resin in the grease in the range of 20% to 50%, and the lubricant can be used for a long time. It is possible to obtain an excellent lubricant that can maintain the initial performance even when used. Further, according to the tape cassette of the present invention, by using a lubricant in which a low molecular weight tetrafluoroethylene resin is mixed with grease in a high ratio of 20% to 50% in the rotary sliding portion of the tape cassette, the required initial tension is increased. It is possible to obtain an excellent tape cassette which satisfies the torque characteristics and maintains the characteristics in running durability.

[0013]

EXAMPLE An example of the lubricant and tape cassette of the present invention will be described below with reference to FIG.

The outline of the present example will be described below.

First, in order to prevent deterioration of the kinetic torque of the lubricant and ensure an appropriate initial torque, grease having a relatively small kinetic torque deterioration is selected in advance, and a solid lubricant is added to this grease to adjust the initial torque. This is what we considered to do.

As a result of investigation, first, as a solid lubricant, a low molecular weight tetrafluoroethylene resin was blended with the base grease selected above to deteriorate the durability characteristics of the base grease. It was possible to adjust the initial torque without.

Further, the solid lubricant content is conventionally 5%.
Although it is usually 10%, it is very difficult to adjust the initial torque with such a blending amount. Therefore, to make it possible to adjust the initial torque, various compounding amounts were examined and 20%
It was confirmed that a blending amount of ˜50% was appropriate. Of course, even when the solid lubricant was blended at 20% to 50%, the durability of the base grease was hardly affected.

On the other hand, if 20% to 50% is added to the grease based on the commonly used solid lubricant such as MoS2, it is considered that the basic characteristics of the base grease may be greatly impaired, but low By using the molecular weight tetrafluoroethylene resin, 20% to 50% blending became possible without causing such an adverse effect.

Next, the specific contents will be described.

Production of Lubricant The lubricant used in this example was produced by the following method. The grease used in this example is a synthetic oil as a base oil, and as the synthetic oil,
A poly-α-olefin synthetic oil was used. Lithium soap was used as a thickener. A low molecular weight tetrafluoroethylene resin (hereinafter referred to as PTFE) was blended with this grease. The compounding quantity of PTFE is 25%, 30
% And 35%, and as shown in Table 1, they are Example 1, Example 2, and Example 3. In addition, PTFE
Has a molecular weight of about 1,000,000, and the particle size of PTFE is 1 μm or less.

Mixing of grease and PTFE was carried out twice using a twin-screw planetary mixer. The first mixing was performed under reduced pressure at 25 ± 5 ° C. for 1 hour, and the second mixing was performed under reduced pressure at 25 ± 5 ° C. for 2 hours.

In addition, commercially available grease was also used in this example (see Table 1). The respective product names are as follows. Comparative Example 1 X5-6020 (manufactured by Dow Corning) Comparative Example 3 GPL223 (manufactured by DuPont) Comparative Example 4 G30M (manufactured by Shin-Etsu Silicon Co., Ltd.) As Comparative Example 2, PTFE was blended in the grease manufactured above. I decided not to.

[0023]

[Table 1]

Evaluation of driving force characteristics and tension characteristics Comparative Examples 1 to 4 in Table 2 are the results of evaluating the performance of greases currently on the market and greases not containing the above-mentioned PTFE by the method described below. Is. There are various types of grease on the market, but as you can see from the table,
It indicates that there is no product that satisfies all the evaluation items.

Examples 1 to 3 in Table 2 are the examination results of the lubricant of this example, which are evaluated for each evaluation item. In Examples 1 to 3, as described above, the grease of Comparative Example 2 was compounded with PTFE at a high ratio. As can be seen from Table 2, by blending PTFE at a high ratio, each property can be satisfied, and the initial driving force and initial tension can be controlled by changing the blending ratio of PTFE.

[0026]

[Table 2]

The measurement results in Table 2 will be described in detail for each evaluation item.

Initial Driving Force and Initial Tension The values in the column of initial driving force in Table 2 are the measurement results at room temperature. As a test method, a lubricant was uniformly applied to the SUS pin, a POM roller was inserted therein, a rubber belt was applied, and then a driving force was measured. The measurement was performed by measuring the driving force on the drive roller. In addition, the lubricant was used for the drive roller portion and the two corner roller portions (see FIG. 1). As shown in Table 2, the initial driving force could be arbitrarily set by controlling the compounding ratio of PTFE. Here, the initial driving force is 70 to 11
It is preferably in the range of 0 g. The initial tension was measured by a tape tension pickup 7 as shown in FIG. Here, the initial tension is 40 to 80.
It is preferably in the range of g.

Long-term use durability and bad environment use characteristics Long-term use durability is measured for 10 days in each bad environment of 5 ° C to 45 ° C, and changes in driving force and tension due to deterioration of characteristics of lubricant. Is evaluated. 5 ℃ ~ 45 ℃
Regarding the adverse environment, three constant temperature baths were prepared, and each was set at 5 ° C, 23 ° C (normal temperature), and 45 ° C, and continuous measurement was performed for 10 days in that, and durability was evaluated. The symbols in the table will be described. ◯ indicates that the tension is within the range of 40 g to 80 g and the driving force does not change. Δ indicates that the tension is in the range of 40 g to 80 g, and the change in driving force is small. ▲ indicates that the tension is out of the range of 40 g to 80 g, and the driving force changes greatly. ×
Has a tension greatly deviating from the range of 40 g to 80 g, and the driving force changes significantly. here,
○ to △ are desirable, and ▲ to × are those that are significantly deteriorated or cannot be measured. As shown in Table 2, when PTFE is not blended (Comparative Example 2) and PTFE is blended (Examples 1 to 3), long-term use durability is affected. Is not observed, indicating that it is equivalent to the lubrication characteristics before mixing. The adverse environment use characteristic is an evaluation of the characteristic change of the lubricant with respect to the environmental change. First, the driving force was measured at room temperature, and then the driving force was similarly measured in each bad environment to evaluate the change and the driving force value. Here, each bad environment is a temperature condition of 5 ° C., 23 ° C. (normal temperature), and 45 ° C. The meanings of the symbols in the table are the same as those of long-term use durability. As can be seen from Table 2, the one not containing PTFE (Comparative Example 2) is ▲, while the one containing PTFE (Examples 1 to 3) is all ◯. , The characteristics for use in adverse environments have been remarkably improved.

Comprehensive Evaluation From the results of Table 2, initial driving force = 70 to 110 g, initial tension = 40 to 80 g, long-term use durability = ○ to Δ, and bad environment use characteristics = ○ to Δ. Although it is desirable to satisfy all of the above, it was confirmed that Examples 1 to 3 satisfy all of the items.

In summary, by adding a low molecular weight tetrafluoroethylene resin (PTFE) to the grease in the range of 20% to 50%, the initial driving force and the initial tension can be easily adjusted, and It was possible to obtain an excellent lubricant capable of maintaining the initial performance even after long-term use. That is, it was possible to obtain a lubricant which facilitates the adjustment of the kinetic torque and at the same time maintains the initial performance sufficiently even after long-term use. Therefore, setting of the lubricant, which has been very difficult until now, has become very easy. Further, the grease and the low molecular weight tetrafluoroethylene resin can be mixed with a relatively simple facility, and the production of the lubricant is facilitated.

On the other hand, by using a lubricant in which grease is mixed with a low molecular weight tetrafluoroethylene resin in a high ratio of 20% to 50% in the rotary sliding portion of the tape cassette, the required initial driving force and initial tension can be obtained. It was possible to obtain an excellent tape cassette that was satisfactory and maintained its running durability. As a result, the tension and torque characteristics are extremely stable in each adverse environment run, and therefore it is recognized that the drive roller and the corner roller rotate under a constant load, and the tape maintains its stable state even after long-term use. I got a cassette.
Further, it was possible to obtain a tape cassette having a good hitting waveform with little torque deterioration particularly at high temperatures.

The present invention is not limited to the above-described embodiments, and it goes without saying that various configurations can be adopted without departing from the gist of the present invention.

[0034]

As described above, according to the present invention,
It was possible to obtain an excellent lubricant capable of easily adjusting the initial driving force and the initial tension and maintaining the initial performance even when used for a long time. That is, it was possible to obtain a lubricant which facilitates the adjustment of the kinetic torque and at the same time maintains the initial performance sufficiently even after long-term use. Further, according to the present invention, it is possible to obtain an excellent tape cassette which satisfies the required initial driving force and initial tension characteristics and further maintains the characteristics in running durability. As a result, the tension and torque characteristics are extremely stable in each adverse environment run, and therefore it is recognized that the drive roller and the corner roller rotate under a constant load, and the tape maintains its stable state even after long-term use. The benefit is that a cassette can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a tape cassette of this example.

[Explanation of symbols]

 1 Drive roller 2, 3 Corner roller 4, 5, 6 Axis 7 Tape tension pickup 8 Tape 9 Drive belt

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Claims (2)

[Claims] 1. A lubricant comprising at least 20% to 50% of a solid lubricant in a grease containing a synthetic oil as a base oil. 2. A drive roller part and a corner roller part, wherein at least the corner roller part uses a lubricant prepared by mixing at least 20% to 50% of a solid lubricant with grease containing synthetic oil as a base oil. Characteristic tape cassette.