JPS6387267A - Platen roll - Google Patents

Abstract

PURPOSE:To contrive reductions in noise and weight while maintaining suitability for printing, by forming a roll by using a rubber composition for an outer layer part and an inner layer part and using a resin for an intermediate layer. CONSTITUTION:An outer layer 4 comprising a rubber composition comprises a thermoplastic polymer in an amount of 20-30pts.wt. per 100pts.wt. of all rubber components, and has a tandelta of 0.15-0.30 and an ES of 200-450kg/cm<2>. A resin used as an intermediate layer 5 has an elastic modulus of 20,000-150,000kg/cm<2>. An inner layer 6 is constituted of a rubber composition, and has a tandelta of 0.20-0.60. The thicknesses of the outer layer 4, the intermediate layer 5 and the inner layer 6 are respectively 2-5mm, 5-15mm and 0.5-5mm, and the layers are concentrically provided on a metallic shaft 1 in a body, whereby reductions in weight of a platen roll and noise can be contrived while maintaining suitability for printing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-noise grating roll that reduces noise during printing in an impact type printer and is lightweight.

Conventional technology The conventional grating roll used in printers using the Inno printing method has a high hardness rubber layer around the metal shaft (1), as shown in Figure 1 (a). (2
) are provided concentrically, or as shown in Fig. 1 (6), a layer of high hardness rubber (2) is placed on the outside of an integral roll of a metal cylinder (1) and a metal cylinder (3). These are commonly used. The problems with these conventional platen rolls are (1) high noise during printing, which is unfavorable for the health of workers and the surrounding indoor office environment; (2) large weight and large drive motor; Because of this, there was a problem in that it was not possible to accommodate the need for converting devices to 4-connectors or saving power.

For this reason, grating rolls with two-layer and three-layer structures have been previously proposed, each of which has a core made of a metal shaft or a resin coated metal shaft, and an elastic body concentrically fixed to the core. (Japanese Patent Application No. 60-273390, Japanese Patent Application No. 60-273391.

(Japanese Patent Application No. 60-273392), these inventions are
Although it had a considerable effect in the frequency range of Hz to 4 kHz and was able to achieve noise reduction, it was not expected to reduce noise in the relatively high frequency range of 8 kHz.

As mentioned above, conventional grating rolls are not fully satisfactory in reducing noise in the high frequency range, so the present invention maintains printing suitability, is lightweight, and achieves low noise in the high frequency range. By doing so, the aim is to solve problems such as improving and improving the working environment all at once.

The inventors of the present invention have conducted intensive studies on a platen roll that fully exhibits noise reduction performance in the high frequency range for impact-type printers and is lightweight and dusty, as shown in Figure 2 (
&), As shown in (b), (1) a rubber composition consisting of high hardness rubber or a nidistomer is used for the outer layer (4), a resin is used for the intermediate layer (5), and the inner layer (6) is By constructing the roll using a rubber composition as
We were able to maintain sufficient printing suitability, reduce noise in the high frequency range, and reduce weight.

(2) The contribution of the outer layer (4) and the inner layer (6) is greater than that of the intermediate layer (5) K in reducing noise, and the material properties of the outer layer (4) are −δ, which represents the viscosity term; E representing the spring ring, (
5% tensile physical property ratio) was dominant, and it was found that there is an optimum range of physical properties.

That is, when -δ is 0.15 to 0.30 and the tensile modulus at 5% elongation is 200 to 450 Kl/fi, noise reduction, particularly in the high frequency range, can be achieved.

In other words, if -δ is 0.30 or more, the impact of the head)
Although this is preferable for damping the vibrations that occur, the contact time between the head and the platen roll becomes longer, and as a result, it is not possible to reduce noise.

Furthermore, if tan δ is less than 0.15, the vibration damping effect will be greatly reduced, and it will not be possible to achieve low noise.

Regarding the effect of E, the vibration propagation speed is shown in the case of longitudinal waves. Here, μ is Poisson's ratio, E is the elastic modulus (E is equivalent here), and ρ is the density.

If the 4Ason ratio is small, it is proportional when the amount of deformation is minute.

As is clear from this, the smaller the elastic modulus E, the slower the propagation speed, and the noise can be reduced by diffusing the vibration energy during that time. The above-mentioned two physical property regions must be satisfied at the same time, and if either one of them is satisfied, it is not possible to achieve the most effective noise reduction.

(3) The outer layer (4) is deeply involved in the above-mentioned noise, and also greatly affects printing suitability.

In particular, it correlates with some of the hardness and viscosity terms, and the hardness is 95
(JIS-A) or less, and with high viscosity systems such as -δ of 0.30 or more, when the in/4' head hits, holes or tears may occur in the printing paper, making it impossible to function as a grana/roll. Furthermore, if the hardness is 100 or more and ma is 0.15 or less, the repulsion will be large, so the contact time between the printing paper and the head will be extremely short. Characters with corners may be blurred or some portions of the characters may not be printed and become unclear, resulting in poor printing suitability.

In this way, from the point of view of printing suitability, the hardness is 95 to 10.
It is necessary that the value is in the range of 0, and -δ is in the range of 0.15 to 0.30.

(4) For the inner layer (6), it has been found that among its material properties, the effect of -δ, which represents the viscosity term, makes a large contribution. That is, fi
, it was possible to further reduce the noise in a relatively high frequency range of 4 to 8 kHz. This means that when the vibration waves generated by the impact of the impact head are transmitted to the shaft through the outer layer and the intermediate layer, -δ is 0.20 between the intermediate layer and the shaft.
By providing an inner layer with a high vibration damping performance of ~0.60, the transmission of vibration waves to the shaft is greatly damped. Therefore, the transmission of vibration from the shaft to each part of the printer or the main body is also reduced, achieving low noise.

Note that if -δ is less than 0.20, the above-mentioned vibration damping effect will be small and noise reduction will not be achieved.
If δ is 0.60 or more, deformation, deflection, etc. are likely to occur, making it impossible to maintain printing suitability.

(5) For the intermediate layer (5), a composite material containing thermoplastic resin or thermosetting resin and filler as necessary is used in order to reduce the weight. Since it is rotating while being continuously struck by the external force, if it bends or deforms due to such external forces, it will become a source of noise and will also lose its printing suitability. In order to satisfy this requirement, the resin used as the intermediate layer (5) must have a flexural modulus of 20.000 to 150.
000Kf/3''.

To explain the present invention in more detail based on the above study results, the materials constituting the outer layer (4) consisting of a copolymer composition include natural rubber, -lisoptylene copolymer rubber, and styrene-butadiene copolymer rubber. .

? Lichlorogrendem, ethylene-propylene copolymer hum,? A rubber composition or natural rubber characterized in that it has an lfi of 21!1 or more selected from the group consisting of littadiene rubber, I-urethane rubber, 4-lyacrylate rubber, and polynordelene rubber, or natural rubber.

1 selected from the group consisting of polyisoglene rubber, styrene-butadiene rubber, polychloroglene rubber, ethylene-glopylene copolymer rubber, and polybutadiene rubber.
Reinforced rubber in which short fibers of a thermoplastic polymer having a uniform % of C-Nu+ base in the molecule are grafted via an initial polymer of phenol-formaldehyde resin, and the proportion of thermoplastic polymer is total rubber. It is characterized in that the amount is 2 to 30 parts by weight per 100 parts by weight of the component, and -δ is 0.15 to 0.
．． It is sufficient if 30, E, satisfies 200 to 450 IP/($1").

Further, the materials constituting the intermediate layer (5) include ABS resin, polystyrene resin, and polyethylene resin.

Thermoplastic resins such as noryl resins, phenolic resins,
Engineering I xy resin, unsaturated/+7 ester resin.

There are thermosetting resins such as diallyl phthalate resin, but it is sufficient that the flexural modulus is 20,000 to 150,000 Kf6, and these resins may be used alone or in a blend system.

Furthermore, the materials constituting the inner layer (6) include natural rubber,
A rubber composition comprising one or more members selected from the group consisting of polyisobutylene rubber, styrene-butadiene copolymer rubber, and polychloroglene rubber, -
It is sufficient if δ satisfies 0.20 to 0.60.

The outer layer (4) described above has a thickness of 2 to 5 m, the intermediate layer (5) has a thickness of 5 to 1511 fi, and the inner layer (6
) with a thickness of 0.5 to 5 fi and is integrally formed concentrically on a metal shaft to reduce the weight of the platen roll while maintaining printing suitability.

It has become possible to reduce noise.

Next, the present invention will be explained in detail based on Examples, but the present invention is not limited to these Examples in any way.

Example 1 As materials constituting the outer layer (4), 100 parts by weight of ethylene-globylene copolymer, 30 parts by weight of 1,2-polybutadiene
This is a rubber composition consisting of 100 parts by weight of carton black, and its physical properties include a tensile modulus of elasticity at 5% elongation of 32
0114/3”, -δ0.181.

The hardness is 98.

On the other hand, ABS resin (Nippon Steel Chemical Co., Ltd. ABS-300) is used as the material constituting the intermediate layer (5), and the inner layer (
The materials constituting 6) are 100 parts by weight of butyl rubber, 80 parts by weight of 40/60 blend rubber of natural rubber/styrene-butadiene copolymer rubber, and Cargon Black 70! A rubber composition consisting of parts of
baa O, 541, with a metal shaft of diameter IQm as the core (1) and the above-mentioned materials, inner layer thickness 3 m, intermediate layer thickness 7 tx, outer layer thickness 3 n.
A platen roll integrally molded concentrically with the core (1) was obtained.

Example 2 The material constituting the outer layer (4) is 9 parts by weight of natural fume, 4 parts by weight,
An integrally molded platen roll was obtained in the same manner as in Example 1 except that a rubber composition consisting of 603 parts by weight of styrene-butadiene copolymer and 290 parts by weight of cargo knob 2 was used. The physical properties of the outer layer rubber composition are shown in Table 1.

Example 3 Except that the material constituting the outer layer (4) was a rubber composition consisting of 50 parts by weight of natural rubber, 40 parts by weight of styrene-butadiene copolymer, 10 parts by weight of FRR, and 90 parts by weight of Carzen black. A grating roll integrally molded in the same manner as in Example 1 was obtained. The physical properties of the outer layer rubber composition are shown in Table 1.

The composition of the above FRR is 6-nylon (1030B manufactured by Ube Industries) based on 100 parts by weight of natural rubber.
This is a reinforced rubber obtained by kneading 2.14 parts by weight of a lac-type phenol formaldehyde initial shrinkage product (550PL, manufactured by Showa Kasei ■) and subjecting it to a graft reaction. The details of the manufacturing method were previously specified in Japanese Patent Application No. 76313/1983, which was proposed by the same applicant as the present applicant.

Comparative Examples 1 to 3 As shown in Figure 1 (,), the inner layer in Examples 1 to 3 was not provided, and the thickness of the layer (7) using resin constituting the intermediate layer was set to 10IEII. A platen roll integrally molded concentrically with the core (1) was obtained using the same materials and dimensions as in Examples 1 to 3 in all other respects.

Comparative Example 4 Similarly to Comparative Example 1, no inner layer was provided and the layer (7) using resin constituting the intermediate layer had a thickness of 10EB, and styrene butadiene was used as the material constituting the outer layer (4). A rubber composition consisting of 100 parts by weight of copolymer and 280 parts by weight of CARDEF 12F, its physical properties are 5% elongation tensile modulus of 523 Ky/α3°-δ0.466, hardness of 97, and core (1). The materials used for the resin were the same as those in the examples, and a grating roll integrally molded concentrically with the core (1) was obtained.

Comparative Example 5 An inner diameter of 241 m was provided with protruding metal shafts (1) with a diameter of 10 g at both ends as shown in FIG. 1(b).

A hollow cylindrical body (3) with an outer diameter of 300 and a thickness of 3 on the outside of the roll.
An outer layer (2) of a simple thermosetting polyurethane rubber was provided.

The physical properties of the thermosetting polyurethane rubber are as follows: 5% elongation tensile modulus is 842 Kf/cIL'', -δ0.114, and hardness is 98.

Examples 1 to 3 above. Details of Comparative Examples 1 to 5 are shown in Table 1.

Using the platen rolls of Examples 1 to 3 and Comparative Examples 1 to 5 described above, the platen rolls were attached to an actual grinder machine and the 703
The microphone was placed on a table at a position in front of it in the horizontal direction 1000 degrees, and the measurement was carried out with the printing paper interposed.

The measurement results for noise level 4 explained above are shown in Figures 3 to 5.
As shown in the figure. As is clear from the results shown in Fig. 3, the platen roll of Example 1 is almost the same as the platen roll of Comparative Example 1 in the low frequency range of 4 kHz or less, but is relatively lower in the frequency range of 4 to f3 kHz. Noise levels are reduced in high frequency ranges. Also, compared to the platen roll of Comparative Example 4 and Comparative Example 5, which has been frequently used in the past,
The noise level is significantly reduced in the relatively high frequency range of kHz. The reason why Comparative Example 4 is inferior in noise reduction is due to the characteristics of the outer rubber (high elastic modulus at 5% elongation), which was detailed in the previous proposal (Japanese Patent Application No. 61-132,669). In addition, at the same time as measuring the noise level, visual printing suitability was determined by repeatedly hitting the angular letters M and W. In this case, there was no difference between Example 1 and Comparative Examples 1, 4, and 5, and the results were good. Ta. Furthermore, Fig. 4 shows the measurement results of the noise levels of Example 2 and Comparative Example 2, and Fig. 5 shows the measurement results of Example 3.
As is clear from FIGS. 4 and 5, which show the measurement results of the noise level of Comparative Example 3, Examples 2 and 3 have a relatively high frequency of 4 to 8 kHz compared to Comparative Examples 2 and 3. Noise levels are decreasing in the area. Note that printing suitability by visual inspection was determined by repeatedly hitting angular characters M and W. In this case, Examples 2 and 3 were compared to Comparative Examples 2 and 3 or Comparative Example 4. There was no difference from Comparative Example 5, and the result was good.

Regarding weight ftK, there was almost no difference between Examples 1 to 3 and Comparative Examples 1 to 4, but compared to Comparative Example 5, Examples 1 to 3 were 7 to 8% lighter in weight.

As detailed above, the platen roll of the present invention has a remarkable effect on noise reduction, is lightweight, and can contribute to improving the working environment without impairing printing suitability, as well as being able to save energy. has.

[Brief explanation of the drawing]

FIG. 1(a) and FIG. 1 (negative) are longitudinal cross-sectional views of a conventional platen roll, and FIG. 1(c) is a longitudinal cross-sectional view of a platen roll according to the present invention excluding the inner layer of the comb composition. 2(a) is a vertical sectional view of the platen roll according to the present invention, FIG. 2(a) is a sectional view perpendicular to the shaft of the platen roll, FIGS. 3, 4, and 5. are charts showing the measurement results of noise levels. In the figure, 1... Shaft, 2... Rubber layer, 3... Metal cylinder, 4... Outer layer, 5... Intermediate layer, 6... Inner layer, 7... Resin layer. be. Figure 1 Figure 2 Figure 3 Figure 4 (dBA) 1 octave gundo center frequency Figure 5 (dBA) Procedural amendment (method) % formula % 1. Indication of incident Patent application No. 1988-231318 No. 2 , Name of the invention Graten Roll 3, Relationship with the case of the person making the amendment Patent applicant address 10-1 Kyobashi-chome, Chuo-ku, Tokyo Name (
527) Treestone Co., Ltd. Representative: Iri Iri, 1962; Agent address: 5 Osaka Building, 1-1 Kyobashi-chome, Chuo-ku, Tokyo 104; Date of amendment order: January 7, 1985 (Shipping date: January 1988) (Mon. 27th) 6. Full text of the specification to be amended 7. Details of the amendment as shown in the attached sheet

Claims (8)

[Claims] (1) With the shaft as a core, an inner layer made of a rubber composition tightly attached around the core in a concentric circle, and an intermediate layer made of a resin further attached around the inner layer in a concentric circle with the core. A platen roll composed of three layers: a layer and an outer layer made of a rubber composition tightly attached around the intermediate layer in a concentric circle with a core. (2) Claims characterized in that the rubber composition of the inner layer is one or more selected from the group consisting of natural rubber, polyisobutylene rubber, styrene-butadiene copolymer rubber, and polychloroprene rubber. The platen roll described in item (1). (3) The platen roll according to claim (1), wherein the rubber composition of the inner layer has a tan δ of 0.20 to 0.60 at 100 Hz and 0.3% strain. (4) The platen roll according to claim (1), wherein the resin of the intermediate layer is a thermoplastic resin or a thermosetting resin. (5) The resin of the intermediate layer has a flexural modulus of 20,000 to 150
, 000 Kg/cm^2. (6) The rubber composition of the outer layer is ethylene-propylene copolymer rubber (resin-containing modified rubber), polybutadiene rubber, polyurethane rubber, natural rubber, polyisoprene rubber, styrene-butadiene copolymer rubber, polychloroprene rubber, polyacrylate rubber, Claim No. 1, which is one or more selected from the group consisting of polynorbornene rubber (
The platen roll described in section 1). (7) The rubber composition of the outer layer is one or more selected from the group consisting of natural rubber, polyisoprene rubber, styrene-butadiene copolymer rubber, polychloroprene rubber, ethylene-propylene copolymer rubber, and polybutadiene rubber;
A reinforced rubber composition in which short fibers of a thermoplastic polymer having ▼ groups in the molecule of vulcanizable rubber are grafted via an initial polymer of phenol-formaldehyde resin. The platen roll according to claim (1), wherein the proportion of the short fibers of the thermoplastic polymer in the rubber composition is 2 to 30 parts by weight based on 100 parts by weight of the total rubber components. . (8) The rubber composition of the outer layer has an elastic modulus of 200 at 5% elongation.
The platen roll according to claim 1, wherein the tan δ at 100 Hz and 3% strain is 0.15 to 0.30.