JP2526564Y2 - Rubber roll for paper feeder - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a rubber roll for a paper feeding device used for feeding and conveying paper in office equipment such as a copying machine, a facsimile, a laser beam printer and the like. It is.

[Conventional technology]

In office equipment such as copiers, facsimile machines, and laser beam printers, rubber rolls are used to feed and convey paper. Such a rubber roll requires a large conveying force in order to obtain a good sheet feeding and conveying state. In particular, when a film for an overhead projector (hereinafter, referred to as OHP) is used as a sheet, a still greater conveying force is required.

Conventionally, in order to obtain a large conveying force to the rubber roll, so that the rubber composition used in the production of the rubber roll has a high friction coefficient, for example, `` to lower the hardness '' `` impregnated with a large amount of oil to increase the viscosity term A method has been taken to add consideration to the material composition of the rubber roll, such as "do".

[Problems to be solved by the invention]

By the way, as described above, in order to obtain a large conveying force on the rubber roll, when considering the material composition of the rubber roll,
In order to satisfy a number of properties such as processability and storage stability in addition to obtaining a high friction coefficient, various compounding agents must be examined to determine the optimum amount. However, such an operation requires enormous time, labor and material costs, and is problematic.

[Means for solving the problem]

The present inventors have conducted various experiments and studies on solving the problems recognized in the prior art, and as a result, have found a rubber roll for a paper feeding device that can exert a large conveying force using an existing rubber composition. Successful. That is, outer diameter 38φ, 34φ,
For each of 31φ, 27φ, 24φ, width 40mm, 30mm, 20mm, 1
Prepare rubber rolls of 0 mm, and load 100 to 40 for these.
As a result of measuring the friction coefficient μ at 0 g and a peripheral speed of 100 to 500 mm / s, when the load is 100 g and the peripheral speed is 100 mm / s, the outer diameter is 38φ, 31φ, 2
For 4φ, see Table 1 and load 400g, peripheral speed 500mm / s
For the outer diameters of 38φ, 31φ, and 24φ, the results shown in Table 2 were obtained.

From the above results, when the load and peripheral speed are constant, the friction coefficient μ
Are almost the same, and are hardly related to the width and the outer diameter.

However, looking at the load per width, Table 3 below shows that the load per 10 mm width is 100 g and the peripheral speed is 500 mm /
It can be seen that the friction coefficient μ of the narrow rubber roll is high as shown in the measurement results for the case of s).

Therefore, it is more effective to provide a plurality of narrow rubber rolls than a single wide rubber roll as a rubber roll for a paper feeding device that requires a large transport force for OHP transport. The reason for this is considered that the surface layer of the rubber roll is more likely to be deformed when the rubber roll is narrower than when the rubber roll is wider, thereby increasing the contact area with the paper.

Therefore, the present invention is based on the above results, in order to provide a rubber roll for a paper feeding device that can exert a large conveying force using a known rubber composition, a roll formed integrally, the outer surface thereof A plurality of cuts are formed at an arbitrary pitch in the circumferential direction on the surface layer portion of the above, and the vicinity of the roll surface on both sides of the cut is in close contact with each other.

[Action]

By forming a plurality of cuts at an arbitrary pitch in the surface layer portion of the outer surface of the integrally formed roll in the circumferential direction so that the vicinity of the roll surfaces on both sides thereof are in close contact with each other,
The effective roll width can be increased without increasing the roll width, and the surface area of the rubber roll is easily deformed by each cut, increasing the contact area with the paper. Can be

〔Example〕

FIG. 1 shows an embodiment of a rubber roll for a paper feeder according to the present invention. This rubber roll (10) is provided at a predetermined interval on the surface layer of the outer peripheral surface of a wide roll (11). A plurality of pitches, for example, seven cuts (12) (12) ...
Are formed in the circumferential direction.

According to the rubber roll (10), the surface layer on the outer peripheral surface of the roll (11) is easily deformed by the cuts (12) (12) formed in the circumferential direction, thereby increasing the contact area with the paper. As a result, a large conveying force can be obtained.

Table 4 below shows the rubber roll (10) of the present invention described above.
Is a measurement result of an experiment carried out to prove that a large conveying force can be exhibited. That is, in the experiment, a rubber roll having an outer diameter of 38 φ, an inner diameter of 20 φ, and a width of 40 mm was used.
Rubber rolls No. 1 to No. 5 according to the present invention processed as shown in FIG.
Rubber rolls No. 6 to No. 9 of a comparative example processed as shown in (I) (with an annular groove formed on the outer peripheral surface), and a conventional state in which it was not processed as shown in FIG. With respect to the rubber roll No. 10, a friction coefficient μ of plain paper and OHP was measured at a load of 400 g and a peripheral speed of 100 / s. However, the temperature and humidity at the time of the measurement are a temperature of 23 ° C. and a humidity of 55%.

From the above results, the rubber rolls No. 1 to No. 5 according to the present invention
Shows that the friction coefficient μ is higher than the comparative rubber rolls No. 6 to No. 9 and the conventional rubber roll No. 10, and the comparative rubber rolls No. 6 to No. 9
Has a friction coefficient μ about the same as that of the conventional rubber roll No. 10, and further, the rubber rolls No. 1 to No. 5 according to the present invention are rubber rolls No. 6 to No. It can be seen that the effective roll width can be made larger than that of 9. From this, it is clear that the rubber roll (10) of the present invention can increase the effective roll width without increasing the roll width dimension, and also provides a large conveying force.

[Effect of the invention]

As described above, according to the present invention, it is possible to provide a rubber roll for a paper feeding device capable of exerting a large conveying force by using an existing rubber composition, and to obtain a large conveying force in a conventional rubber roll. Therefore, time and labor can be greatly reduced as compared with the case where the material composition is examined.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a rubber roll for a paper feeding device according to the present invention, and FIG. 2 shows an experiment conducted to prove that the rubber roll according to the present invention can exert a large conveying force. It is explanatory drawing which illustrates the used rubber roll. (10)… Roller roll for paper feeder, (11)… Roll,
(12) …… a cut.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-178334 (JP, A) JP-A-62-218343 (JP, A) JP-A-58-26749 (JP, A) 123849 (JP, U) Fully open 60-133855 (JP, U) Fully open 52-119680 (JP, U) Fully open 49-139483 (JP, U) Really open 1962-157748 (JP, U) Shokai Sho 62-11287 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A roll formed integrally, wherein a plurality of cuts are formed at an arbitrary pitch in a circumferential direction on a surface layer portion of an outer surface of the roll, and the roll surfaces near both sides of the cut are closely contacted with each other. A rubber roll for a paper feeding device.