JPS59198242A - Sheet conveying device - Google Patents

Abstract

PURPOSE:To secure sheet conveying force by means of stable, frictional engagedness, by making materials in use combine in a mutually assistant relationship with one another. CONSTITUTION:Each belt is made up of using chloroprene rubber for the right side but urethane rubber for the left side of upper side belts 11 and 11, while in case of lower side belts 12, 12 and 12, each belt is made up of using the chloroprene rubber for the central one but urethane for both sides. In this case, the chloroprene rubber is low temperature and low humidity and has a tendency to a frictional force drop while the urethane rubber also tends to dro its frictional force due to a no carbon paper respectively, but these drawbacks are set off by a mutually assistant relationship so that a drop in the frictional force is in no case produced as a whole simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet conveying device, and more particularly to a sheet conveying device in which the conveying force of a rotating body, that is, the frictional force against a sheet to be conveyed does not fluctuate excessively.

Generally, a rotating body, such as a rotating roller or a rotating belt, is used in an image recording device such as a copying machine or a printer to convey a document, a recording sheet, etc., and the surface of this rotating body is in contact with the sheet. It provides a frictional conveyance force. In this case, in addition to a type in which the sheet is conveyed by sandwiching the sheet between a pair of rotary bodies, there is also a type in which the sheet is conveyed by bringing the rotary body into contact with the sheet on a fixed conveyance surface.

It goes without saying that the conveyance force applied to the sheet by the rotating body needs to be stably applied in office machines such as copying machines and facsimile IJs, but due to regional or seasonal differences in It is also known that changes may occur in the state of frictional retention to be provided to the sheet. In addition, changes in the state of frictional retention occur not only due to the environmental conditions mentioned above, but also due to the material of the sheet being conveyed, such as the influence of paper dust, and the fact that it is coated with carbonless paper. It has also been pointed out that this may be due to the presence of chemicals, but in any case, it is undesirable for such an influence to cause a change in the conveying force to be applied to the sheet.

By the way, the influence of the various external conditions mentioned above on the rotating body as a sheet conveying device is not uniform depending on the material, so it is assumed that one condition, for example, low temperature, The frictional force decreases at the boundary of
In other environments, there is almost no decrease in frictional force, and in case of no-paper paper, a decrease in frictional resistance occurs because chemicals are likely to adhere to it, but in other cases, a decrease in frictional force occurs. If two or more rotating bodies are combined to form a single rotating body, or two or more rotating bodies are combined to form a set of conveyance equipment, the two materials will compensate for each other's other drawbacks. , it has the advantage that it is possible to create a product that does not cause a large decrease in frictional force as a whole.

The present invention provides a sheet conveying device in which a sheet conveying force is obtained through a stable state of frictional engagement by skillfully combining two or more materials that are complementary to each other. This is what we provide.

In addition, since the present invention is concerned with the contact state between the rotating body and the sheet, it is only necessary that the surface material of the rotating body is configured as described above. Of course it is not necessary.

The present invention will be explained below based on embodiments shown in the drawings,
At the top of the main body 1, from the right side in the figure, a document placement table 2, a pickup roller 3, a sheet separation/conveyance device 4, a conveyance row 95.6, a reading section 7, and an ejection row 28, 9 are arranged in order, and furthermore, the left end A discharge tray 10 is provided. In addition,
The sheet separating and conveying device 4 includes a pair of upper and lower rotating bells).
11. From 12 onwards, the upper belt 11 rotates in the direction of the arrow to apply conveying force to the sheet, and the lower belt rotates in the opposite direction to return conveying force to the lower sheet in the case of double feeding. It is designed to give.

The lower part of the main body is brought into contact with a recording body 14 such as a sheet roll unwound from a sheet roll 13, a sheet roll 13, a thermal head, etc., and after predetermined information is recorded, it is cut by an auto cutter (not shown) and discharged. A structure for discharging onto the tray 16 is arranged.

In the above, the present invention may be applied to any of the pick-up roller 3°, the upper belt and lower belt of the sheet separation and conveyance device 4, the conveyance rollers 5 and 6, and the discharge rollers 8 and 9. shows a side cross section of the sheet separation and conveyance device 4. Here, for example, upper bell) 11.1
The belt on the right side of Figure 1 is made of chloroprene rubber, and the belt on the left is made of urethane, and for the lower bell (12, 12.12), the center one is made of chloroprene rubber, and the left and right ones are made of urethane rubber. When constructing a belt using chloroprene rubber, the frictional force tends to decrease at low temperature and low humidity, and the frictional force of urethane tends to decrease due to carbonless paper, but since these are complementary to each other, The advantage is that there is almost no simultaneous reduction in the frictional force throughout the entire structure. In FIG. 2, reference numeral 17 indicates a sheet conveyed between the upper belt 11ε and the lower belt 12.

Fig. 3 0), @ uses two types of materials having a complementary relationship as described above to construct the rotary row 218 for sheet conveyance, with material portions 18 a m 18 m... and others in the circumferential direction. An example is shown in which the material is divided into material parts 18b, 18b, etc. By doing so, there is an advantage that the frictional force of one rotating body as a whole does not significantly decrease due to environmental conditions, etc. It will be done. Figure 4 (a).

(B), (T, N) are endless belts for conveying sheets 19°20.21. l'2 shows cases in which two complementary materials are provided in various ways. In the figure, the shaded areas and white areas indicate side materials.

Note that the combination of complementary materials is not limited to the above-mentioned examples, and may include materials conventionally used as the surface of a rotating body for conveying sheets, as well as materials that have a large change in frictional force due to environmental conditions, etc. There is also the advantage that materials that are not used for some reason can be given the possibility of being used.

As described above, the sheet conveying device according to the present invention has two
By using materials that are complementary to each other in their properties in which the frictional force of the sheet changes depending on the conditions of use, it is possible to obtain a stable frictional force as a set of sheet conveying devices. The practical benefits are significant.

[Brief explanation of the drawing]

Figure 1 is a diagram of a facsimile machine to which the present invention is applied;
Figures (a) to (a) are explanatory diagrams of rotating belts showing other configuration examples. 1...Main body, 2...Document loading table, 3...
- Pickup roller, 4... Sheet separation and conveyance device, 51, 6... Conveyance roller, 7... Reading unit, 8.
9...Discharge roller, 10.16...Discharge tray, 11...Upper belt, 12...Lower belt,
13... Sheet roll 14... Thermal head, 15... Platen roller, 17... Conveyance sheet, 18... Rotating roller,
19.20, 21.22...Rotating belt. Figure 2 Figure 3 (a)
(b) Figure 4

Claims (1)

[Claims] In a sheet conveyance device that conveys the sheet in frictional contact with the sheet or has a plurality of rotating bodies, the sheet contact surface of the rotary body is made of a plurality of materials whose frictional force with the sheet changes complementary depending on usage conditions. A sheet conveying device characterized by: