JPS62157152A - Paper sheet and the like conveynace belt and manufacture thereof - Google Patents

Abstract

PURPOSE:To increase fidelity of a duplicator and the like, by a method wherein a sheets conveyance belt provides high surface friction action against a document, provides low friction action against the surface of a vacuum sucking device, and provides excellent resistance properties against a tensile force. CONSTITUTION:A sheet conveyance belt 1 has a chlorinated skin layer on the one surface of a rubber belt having a friction factor mu of 1.0 or more. Since it is imperative that a belt 1 has excellent tensile resistance properties, it is prepared so as to have hardness of about 50 or more and about 70 or more. In order to manufacture the sheet conveyance belt 1 with highmost efficienty, after a rubber belt is formed using a rubber composition so prepared as to have vulcanized rubber hardness of 70 or less, the belt is immersed in a chlorine solution for a given time so that a surface friction factor mu is adjusted in a range of 0.5-0.3. Thereafter, a method, wherein the one surface of the belt is ground to remove a chlorined skin layer, is employed.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a plain paper copying machine (hereinafter abbreviated as PPC copying machine).
The present invention relates to a rubber endless belt that can be suitably used for conveying paper sheets in computers, facsimile machines, etc., and particularly to an improved structure and manufacturing method thereof.

[Traditional technique]

PPC copying machines currently on the market have some differences in mechanism depending on the manufacturer, but the principle is as schematically shown in FIG. 2. To explain with reference to the same figure, first set the original and press the start button (not shown), then the original paper (P) is transferred from the single-sheet cassette (C) to the pair of timing rolls by the paper feed roll (R). (T, T), and the starting end of the photosensitive surface (S) of the photosensitive drum (D) is held between the rolls (T) and (T), and the starting end of the photosensitive surface (S) of the photosensitive drum (D) It is kept on standby until it reaches directly above (the position shown in the figure).

Next, when the starting end of the photosensitive surface (S) reaches the position shown in the figure, the timing rolls (T), (T) rotate, and the base paper (P) is sent out onto the conveyor belt (A). (P) is the bell) While being conveyed by (A), desired characters or figures made of a printing material such as carbon are transferred onto the surface of the photosensitive surface (S).

The base paper (P) is further fed between a pair of fixing rolls (B, B) by a conveyor belt (A), and while passing between the rolls, characters or figures on the surface are fixed by heating.

As is clear from the above, once the tanning roll (T,
The base paper (P) sent to the copying area directly below the photosensitive drum (D) by T) has not yet been fixed with printing materials such as carbon for displaying transferred characters, figures, etc. on its negative side. Thereafter, until it passes between fixing rolls (B, B), it is placed on a conveyor belt (A) and is moved depending on the surface frictional force of the belt. Therefore, if the base paper (P) does not advance at the same and uniform speed as the conveyor belt (A) due to the surface friction force of the conveyor belt (A), the characters or figures to be transferred will "Shrinkage" occurs along the direction of movement of the base paper as seen in FIG. 3 (b).

Note that (a) in the same figure shows printed characters that have been correctly transferred.

In addition, as shown in FIG. 2 (B), the upper conveyor belt (A) is usually stretched in parallel in multiple rows between a pair of rotating shafts (E, E), but each belt (A) ), the base paper (P) conveyed by the belt will be deflected, resulting in distortion of the image surface transferred onto the paper surface.

Therefore, in conventional PPC copying machines, etc., a vacuum suction device is installed from below the conveyor bell I-(A) so that the original paper (P) is moved as closely as possible to the surface of the conveyor bell I-(A). A method of suctioning using (V) or the like is adopted. Note that a plurality of small ventilation holes (not shown) are bored in the conveyor bell l-(A) so that this suction force effectively acts on the base paper.

[Issue to be solved]

By the way, while the base paper (P) passes through the vacuum suction area, each ventilation hole of the conveyor bell 1-(A) is sealed with the base paper (P), so the heald (A) is not connected to the vacuum suction device. is strongly attracted to the surface of the rotating shaft (E, E).
) causes circular motion. Therefore, it is preferable that the friction coefficient on the side where the first general feed heald (A) faces the vacuum suction device is as low as possible; if the friction coefficient is high,
Depending on the hardness of the rubber constituting the heald (A), the belt may wrinkle or meander. Needless to say, these inconvenient phenomena have a negative impact on the conveyance of the base paper (P) and, by extension, on the finished image. Therefore, in conventional equipment, in addition to coating the surface of the belt (A) or the surface of the vacuum suction device with a low-friction resin such as tetrafluoroethylene, a slight bulge was formed at the suction port of the vacuum suction device. Some methods have been adopted to prevent adsorption to the suction port by forming an opening edge, but this method requires extra effort to process the slippery material using such different materials, and Smooth materials are generally expensive.

[Object of the Invention] The present invention provides a solution to the above-mentioned problems in the conventional conveyor heald of PPC copying machines, etc., and provides a high surface friction effect on the base paper and a low surface friction effect on the surface of the vacuum suction device. Paper sheet til that can exert a frictional effect and has excellent resistance to the tensile force received during circular motion.
The object of the present invention is to provide a transceiver I- and a simple manufacturing method thereof, and to increase the fidelity of copying or electronic transmission of characters, figures, etc. in copying machines, facsimile machines, etc.

[Specific measures]

In order to achieve the above object, the paper sheet general feeding heddle according to the present invention is characterized by having a chlorinated surface layer on one side of a rubber belt having a friction coefficient μ of 1.0 or more.

As described above, the general feed heald is stretched between a pair of rotating shafts and is rotated by the rotating shafts, so that a tensile force acts on the heald in the longitudinal direction. Therefore, the heald must also have good tensile resistance. Therefore, the hardness of the rubber belt constituting the conveyor belt (JIS
A) is prepared to be about 50 or more and about 70 or less. The hardness of the rubber is closely related to the friction coefficient μ; a rubber with a hardness of 50 has a friction coefficient of about 1.5, and a rubber with a hardness of 70 has a friction coefficient of about 1.0. When the rubber hardness is less than 50, it is too soft and wrinkles occur in the heald due to the tensile action of the rotating shaft, and when the hardness is more than 70, it is too hard and a load torque is applied to each rotating shaft to make it adhere tightly to the circumferential surface of the rotating shaft. will come into play. Therefore, the hardness is preferably 60 for practical purposes, and in that case the surface ItJlp coefficient μ is about 1.2. However, the surface friction coefficient μ on the side where the rubber heald contacts the paper sheets to be conveyed is approximately 1.0.
The higher the value, the better; however, this will inevitably reduce the rubber hardness, which will prevent the formation of wrinkles and the decrease in tensile strength as described above. In order to avoid such inconvenience,
It is preferable to embed a fiber reinforcing layer in the rubber belt.

On the other hand, the friction coefficient μ of the chlorinated surface layer of the rubber belt
is 0.5 or less, preferably within the range of 0.5 to 0.3. If it is less than 0.3, slip will occur with the rotating shaft.

According to the present invention, in order to most efficiently manufacture the paper sheet conveyance belt having the above structure, a rubber belt is molded using a rubber composition formulated to have a vulcanized rubber hardness (JIS A) of about 70 or less. After that, the surface friction coefficient μ of the rubber belt is
A method is adopted in which the belt is immersed in a chlorine solution for a predetermined period of time so that the chlorine is in the range of 0.5 to 0.3, and then one side of the belt is polished to remove the chlorinated surface layer. By polishing this chlorinated surface, as mentioned earlier, the surface friction coefficient μ
One side of the rubber belt appears where the value is about 1.0 or more.

In place of the above manufacturing method, vulcanized rubber hardness (JIS A) is approximately 7.
It is also possible to adopt a method in which a chlorine solution is applied to one side of a rubber belt made of a rubber composition formulated to have a concentration of 0 or less to chlorinate the surface layer.

[Action/Effect]

As mentioned above, the paper sheet conveyance belt according to the present invention has a friction coefficient μ of 1.0 or more, preferably within the range of 1.0 to 1.5.
The friction coefficient μ is preferably about 1.2, and the back surface is chlorinated so that the friction coefficient μ is within the range of 0.5 to 0.3. If it is placed on the side that contacts the shaft and the suction opening surface of the vacuum suction device and stretched between the rotating shafts, excessive torque will not be applied to the rotating shaft, and the suction force of the vacuum suction device will not be affected. While it can slide smoothly along the suction opening surface, it also has a good frictional effect on the paper sheets being conveyed on the belt, and in combination with the suction action of the vacuum suction device. The paper sheets can be transported normally without being deviated.

〔Example〕

Examples of the present invention will be described below.

[Embodiment 1] FIG. 1 is a perspective view of a conveyor belt for a PPC copying machine according to an embodiment of the present invention. The conveyor belt (1) of this example is first manufactured by using an injection molding machine equipped with a cylindrical medium mold as disclosed in JP-A No. 60-127113, using a chloroprene rubber composition having the composition described below. 1 mm
After forming a rubber belt with a JIS A hardness of 60, the rubber belt was immersed in a liquid bath filled with a 0.1% chlorine solution (chlorine water) for about 15 minutes to chlorinate the surface.
Next, one side of the belt is puffed to scrape off the chlorinated surface layer, and finally, the belt is powdered using, for example, Japanese Patent Application Laid-Open No. 59-182.
It was completed through the steps of drilling a plurality of small ventilation holes (4, 4, . . . ) for vacuum suction using a drilling device as disclosed in Japanese Patent No. 723.

[Composition] [Parts by weight] Chloroprene rubber 100.0 Carbon black 50.0 Softener
10.0 active agent
4. 0 zinc flower
3. 0 Stearic acid 1.0 Anti-aging agent 1. 0 processing aids
0.1 I O U
0. 5 Accelerator A 1.0 - 〃-B 1.0 171.6 Thus obtained example As a result of measuring the initial friction coefficient and the friction coefficient after use, the friction coefficient μ of the front surface (2) when unused and after use was both 1.2, and that of the chlorinated back surface (3). The friction coefficient μ was 0.3 in all cases.

In addition, as a result of the conveyor belt (1) of this example being actually installed in a PPC copying machine and subjected to a practical test, defects such as "shrinkage" or "unevenness" as shown in Fig. 3 (b) or (c) were found. No images were produced. This fact is based on the present example Bell) (11 is
Slip between the surface (2) and the copy paper, stagnation of the circumferential movement due to adhesion between the parallelly arranged belts (1) and the suction opening surface of the vacuum suction device, or rotation of the belts (1). This means that there were no malfunctions such as slips between the shaft and the shaft. Further, the tension retention rate after 3 million rotations was 85%.

[Example 2] This example 1! In the rubber compounding used in Example 1, the LI feed belt was manufactured by changing the amount of carbon black to 80 parts by weight per 100 parts by weight of rubber, thereby improving the rubber hardness (JI).
A rubber belt with S A) of 70 was manufactured, and the chlorinated back surface (3) was adjusted to have a friction coefficient of 0.5 by shortening the immersion time of the rubber belt in chlorinated water to 5 minutes. This is different from Example 1 in that

In addition, when the friction coefficient of the surface (2) of the transport bell (1) of this example was measured, the value was 1.0. and,
In the practical test of this example belt, there was occasional noise, but
No "shrinkage" or "bias" was observed in the copied image.

[Example 3] In this example, the rubber hardness (JI
A rubber belt with SA) of 50 was produced in the same manner as in Example 1. The coefficient of friction of the surface (2) of the belt of this example was 1.5, and the practical test results also showed that good copying results were obtained, similar to those of the previous two examples.

[Comparison example]

By setting the amount of carbon blank in the rubber compounding of Example 1 to 10 parts by weight, the rubber hardness (JIS A)
A completed conveyor belt was manufactured in the same manner as in Example 1, except that a rubber heald with a diameter of 45 was manufactured, and a practical test was conducted using it in conjunction with the conveyor belt manufactured according to Example 1. As a result, the reproduced image was There were some cases where "bias" (see Figure 3 (c)) occurred. Therefore, an attempt was made to improve the structure as in Example 4. The friction coefficient of the surface (2) of the belt of this example was 1.6.

[Example 4] Same as the comparative example in that a rubber belt was manufactured using a rubber composition containing 10 parts by weight of carbon blank, but a woven fabric of polyethylene terephthalate fibers was embedded in the rubber belt. A conveyor belt different from that of the comparative example was manufactured in that the elongation resistance in the longitudinal and lateral directions of the belt was reinforced. The belt of this example was used in a practical device (PPC copying machine) equipped with a rotating shaft with a tensioner.
As a result of a practical test in which the conveyor belt was stretched with an initial strain of 5%, the defects in the conveyor belt of the comparative example were completely eliminated and good copying results were obtained. This example shows that even if the rubber hardness is as low as possible in order to increase the coefficient of friction, it is sufficient to achieve the object of the present invention if the elongation resistance of the belt is strengthened by embedding a reinforcing layer in the belt. It can be seen that it is possible to manufacture a conveyor belt.

[Example 5] A rubber belt similar to that of Example 1 (hardness 60°, friction coefficient 1
．． 2), and on the back side (3) of the rubber belt, a solvent solution of a chlorinated organic compound (manufactured by Rohm and Haas) was applied to the back side (3) of the rubber belt.
By applying Chemro Ivy 7701) several times, the surface (
A conveyor belt was made by chlorinating the surface layer of 3) (friction coefficient -0.3). As a result of practical tests, it was possible to make good copies without shrinking or distorting the copied images.

〔Effect of the invention〕

As described above with reference to several embodiments, the present invention is based on P.
When transporting paper in PC copying machines, facsimile machines, etc., it can exert a high surface friction effect on the paper and a low friction effect on the surface of the vacuum suction device, and Provided is a paper sheet conveying belt with excellent resistance to applied tension and a simple manufacturing method thereof, thereby increasing the fidelity of copying or electronic transmission of characters, figures, etc. in the above-mentioned equipment. .

[Brief explanation of drawings]

Fig. 1 is a perspective view of a rubber conveyor belt according to an embodiment of the present invention, Fig. 2 is a schematic explanatory diagram showing the structure of a copying machine in which the belt of the present invention is used, and Fig. 3 shows an example of a copied image. FIG. In each figure, the symbols are as follows; □ 1: Entire conveyor belt, 2: Surface of belt (1), 3: Back side of belt (11), 4: Ventilation holes.

Claims (7)

[Claims] (1) A paper sheet conveying belt characterized by having a chlorinated surface layer on one side of the rubber belt having a friction coefficient μ of 1.0 or more. (2) The sheet conveying belt according to claim 1, wherein the friction coefficient μ of the chlorinated surface layer is 0.5 or less. (3) The paper sheet conveying belt according to claim 1 or 2, wherein the rubber belt has a rubber hardness (JIS A) of about 70 or less. (4) The paper sheet conveying belt according to any one of claims 1 to 3, wherein the rubber belt has a reinforcing fiber layer embedded therein. (5) A step of molding a rubber belt using a rubber composition prepared to have a vulcanized rubber hardness (JIS A) of about 70 or less, and a step of chlorinating one surface layer of the molded rubber belt. A method for manufacturing a paper sheet conveying belt characterized by comprising: (6) The step of chlorinating the surface layer of one side of the rubber belt comprises immersing the belt in a chlorine solution and then polishing the one side of the belt to remove the chlorinated surface layer. A method for producing a paper sheet conveying belt according to item 5. (7) The method for manufacturing a paper sheet conveying belt according to claim 5, wherein the step of chlorinating the surface layer of one side of the rubber belt is performed by applying a chlorine solution to one side of the belt.