JPH03243551A - Form carrying device - Google Patents

Abstract

PURPOSE:To prevent a form from being creased by the corner of a hard roller by setting the hard roller wider in width than a soft roller, and thereby constituting the end sections of the soft roller not to be extruded from the end sections of the hard roller. CONSTITUTION:An elastic driving roller 2 and a pinch roller 5 made of hard material are disposed while being faced to each other, and a form P is nipped between both of the rollers 2 and 5 so as to be carried. In this case, the width (c) of the hard roller 5 is set wider than the width (d) of the soft roller 2 so that the end sections of the soft roller 2 is constituted not to be extruded from the end sections of the hard roller 5. By this constitution, even when nipping pressure against the form P is set great, the end sections of the soft roller 2 will never be extruded to the side sections of the hard roller 5, it thereby will never come into question that the form P is creased by the corner of the hard roller 5 and the like.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a configuration of a conveyance roller device provided in a paper conveyance path in an apparatus for forming an image using cut paper, such as a copying machine or a facsimile machine, and in particular, The present invention relates to a device configured to prevent paper from being nipped in a state where the soft roller protrudes from the side of the hard roller when a hard roller and a soft roller are combined.

(Prior Art) In image recording devices such as copying machines and facsimile machines, paper stored in a paper storage device is conveyed out by a paper feeding device and moved along a paper conveyance path, and an image is generated during the conveyance. I am trying to perform the recording operation.

As the conveyance roller device, for example, one having a configuration as shown in FIG. 4 is used.

The conveyance roller device 1 shown in FIG. 4 includes a drive roller 2 made of a rubber roller and a pinch roller 5 made of a hard plastic material. Press the rollers with the same pressure to ensure that the paper is nipped between both rollers.

Both rollers are each fixed to a shaft 3.6, and the shaft 3 of the drive roller 2 is driven by a driving means (not shown) to rotate both rollers, and the paper nipped between the rollers is rotated. P can be transported.

Furthermore, in the conventional conveying roller device, the two rollers 2.5 have the same structure,
If the nip pressure between the two rollers is set lightly or if the shafts that support both rollers are in a fixed position, the two rollers will not shift and the paper will be kept in good condition. It becomes possible to nip and transport.

(Problems to be solved by the invention) However, in the conventional device as described above,
If there is some play in the supporting part of the shaft 6 of the pin roller 5, the pinch roller 5 may become misaligned in the lateral direction with respect to the drive roller 2, as shown in FIG. There is.

Further, in the NWI feeding path, it may be necessary to set a large nip pressure between the two eyes and a large number of sheets, and to set a large paper conveyance capacity. In other words, when paper is conveyed vertically or when a large amount of resistance is applied to the paper in the previous stage, it is necessary to set a large nip pressure between both rollers. If the nip pressure is increased, the rubber roller may elastically deform and protrude laterally.

Furthermore, when the rubber roller is configured to have a wider width than the hard roller, there is a problem that the hard roller is located inside the end of the rubber roller, as shown in FIG. 5a. Occur.

As mentioned above, if a misalignment occurs in the contact area between the wide soft roller and the narrow hard roller, the
Then, as shown in FIG. 6a, which is an enlarged view of section A in FIG.

As described above, at the portion where the corner 5a of the hard roller 5 digs into the surface of the soft roller 2, an inflection portion of the pressure against the paper P occurs, and the pressure against the paper P changes greatly. become.

As shown in FIG. 6a, when a sheet is conveyed with the corner portion 5a of the hard roller biting into the soft roller 2, the sheet P is moved as shown in FIG. There are times when streaks are formed in the vertical direction, and the appearance of the recording paper becomes poor due to these streaks.
Problems such as a decline in the quality of the recording paper occur.

(Objective of the Invention) The present invention solves the above-mentioned drawbacks of the conventional conveying roller device.The width of the soft roller is set narrower than that of the hard roller, so that even if the axis of the roller is slightly misaligned, the width of the soft roller is set narrower than the hard roller. ,
It is an object of the present invention to provide a conveying roller device that prevents the corners of a hard roller from digging into the surface of a soft roller and prevents streaks from forming on paper.

(Means and Effects for Solving the Problems) The paper conveying device of the present invention has an elastic drive roller and a pinch roller made of a hard material arranged to face each other, and the paper is conveyed between the two rollers. The present invention relates to a conveying roller device configured to nip and convey.

In the paper conveying device of the present invention, the width of the hard roller is set larger than the width of the soft roller, and the end of the soft roller is configured so as not to protrude from the end of the hard roller. Ru.

By configuring the conveyance roller device as described above, even if the nip pressure against the paper is set high,
The ends of the soft rollers do not protrude to the sides of the hard rollers, and problems such as streaks on the paper due to the corners of the hard rollers do not occur.

Further, the paper conveyance device of the present invention is arranged such that even if the pinch rollers made of hard rows are slightly misaligned in the axial direction, the relationship between both rollers is within the range of the above conditions. This can prevent damage to the paper.

(Example) The configuration of the paper conveyance device of the present invention will be described according to the illustrated example.

In the embodiment shown in FIG. 1, the conveyance roller device 1 includes a drive roller 2 made of a soft roller such as a rubber roller, supported by a drive shaft 3, and connected to a drive means (not shown). so that it can be driven.

The pinch roller 5 is made of a hard member such as hard plastic, and is pressed against the drive roller 2 with a predetermined pressure via a biasing member that supports the support shaft 6. It has become.

In the example shown in FIG. 1, the width C of the vintirola 5 is
is set larger than the width d of the drive roller 2. In the relationship between the two rollers, even if there is play in the axis of the pinch roller 5 and the roller 5 shifts in the axial direction,
It is necessary to set the relationship between the widths c and d of both rollers so that the corner portion of the hard roller is not pressed against the surface of the soft roller.

Therefore, if we set the relationship between both days and La as mentioned above,
As shown in FIG. 2, when the paper P is nipped between the two rollers, the end of the drive roller 2 is always located within the width of the pinch roller 5.

Therefore, in the conveyance roller device 1, even if the nip pressure between the rollers is set to be very strong, the end of the soft drive roller will not protrude to the side of the hard pinch roller 5. It is possible to prevent the corner portions of the pinch roller from pressing the paper P against the drive roller and causing streaks or the like.

The conveyance roller device of the present invention configured as described above has the following features:
For example, in a copying machine, it may be configured as a paper conveyance device when conveying paper in the vertical direction, or it may be configured as a downstream conveyance roller device for a portion where large resistance is applied to the paper. I can do it.

In addition, in paper feeding devices such as facsimile machines, even when the nip pressure in the paper handling mechanism is set high in order to ensure that the paper handling function is performed reliably, the downstream part
By arranging the conveyance roller device of the present invention, paper conveyance performance can be improved.

For example, in the facsimile 10 shown in FIG.
When the paper P stacked on the paper tray 11 is moved toward the image reading section after being sorted by the paper sorting mechanism 12, the conveying roller device 1 of the present invention is installed downstream of the paper sorting mechanism 12. It can be placed.

Configuring the conveyance roller device as described above means that, for example, in a paper handling mechanism, when the separation roller 14 is strongly pressed against the conveyance belt 13 to improve the ability of the paper handling action, the paper handling mechanism 12 The conveyance roller device 1 disposed immediately after the conveyance roller device 1 needs to have a strong nip pressure to increase conveyance performance.

Therefore, in the case of the conveying roller device shown in FIG. 1, which is smaller in size, it is possible to configure the drive roller to have a narrower width and the pinch roller to have a larger width. Even if the pinch roller moves in the axial direction or the drive roller is compressed and widened by setting a large nip pressure between the rollers, the soft end of the roller This prevents the material from coming off the hard rollers or protruding to the sides.

In the facsimile machine 10 having the above-described configuration, the conveyance roller device 1 is disposed downstream of the paper feed device for feeding the paper P from the paper tray 11, and the paper conveyance capacity of the conveyance roller device 1 is greatly increased. Configure as.

An image reading device 16 is provided downstream of the conveyance roller device 1 via a platen 15, and a roller 17 for pressing the document against the platen 15 is arranged in the same manner as in the case of a conventional facsimile machine. be done. Further, a conveying roller device 18 is disposed downstream of the reading device, and conveys the original document that has been read toward the discharge tray.

The conveying roller device 18 can also be configured in the same manner as the conveying roller device 1, thereby preventing any sheet conveying device from applying an action such as excessive bending to the sheet. Ru.

Note that the paper conveyance device of the present invention is not only applied to the conveyance roller device in the facsimile machine as described above, but can also be used as a roller device for a paper conveyance path in eight image forming positions in electronic copying machines, printers, etc. I can do it. In the paper conveyance path of the image forming apparatus, there are sections where a large conveyance capacity is required, such as a curved conveyance path, a paper conveyance path configured to convey paper in the vertical direction, or a portion of the paper conveyance path configured to convey paper in the vertical direction, or a portion of the paper conveyance path configured to convey paper in the vertical direction. The means of the present invention can be applied to locations where it is necessary to set a large nip pressure in between.

In addition, in a conveyance roller device in a paper conveyance path of a general paper feed device, when the conveyance roller device is configured by combining a drive roller having elasticity such as rubber and a pinch roller made of hard plastic or the like. As in the present invention, by limiting the widths of both rollers, it is possible to perform the sheet conveyance function well within the sheet conveyance path.

(Effect of slowdown) The paper conveyance device of the present invention has the above-described configuration. Therefore, compared to conventionally used roller devices, the configuration of the D-ra does not change significantly, and it can be easily incorporated into the paper conveyance path in the same way as conventional roller devices. I can do it.

In addition, in the conveyance roller device of the present invention, even when the nip pressure on the paper is set high, the ends of the soft rollers do not protrude to the sides of the hard rollers, and the corners of the hard rollers cause streaks on the paper. You will no longer have to attach it.

Further, in the paper conveyance device of the present invention, even if the pinch roller, which is a hard roller, is slightly misaligned in the axial direction, the relationship between both rollers is maintained within the range of the above conditions. This can prevent damage to the paper.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the conveying roller device of the present invention, FIG. 2 is an explanatory diagram showing the relationship with paper, FIG. 3 is an explanatory diagram of a facsimile to which the conveying roller device of the present invention is applied, and FIG. A perspective view of a conventional paper conveying device. FIG. 5 is an explanatory diagram when both rollers are misaligned. FIG. 5a is an explanatory diagram when the width of the drive roller is wide. FIG. 6 is an explanatory diagram in the case of FIG. 5a. , explanatory diagram showing a state in which the corner of the pinch roller bites into the drive roller, No. 6a
This figure is an enlarged explanatory view of section A in FIG. 6, and FIG. 7 is an explanatory view showing a state in which streaks are formed on the paper by the corners of the pinch roller. Reference numerals in the figure 1... Conveyance roller device, 2... Drive roller, 3... Drive shaft, 5... Pinch roller, 6... ...Support shaft. Figure 5a Figure 6a Figure 6 Figure 7

Claims (1)

[Claims] A conveying roller configured to have an elastic drive roller and a pinch roller made of a hard material arranged to face each other, and to nip and convey paper between the two rollers. The device is characterized in that the width of the hard roller is set larger than the width of the soft roller, and the configuration is such that the end of the soft roller does not protrude from the end of the hard roller. Paper transport device.