JP3253130B2 - Loading material separation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a facsimile, a printer, and the like, and more particularly, to a stacked material separating apparatus for separating stacked stacked materials one by one and feeding or conveying the stacked materials. Things.

[0002]

2. Description of the Related Art Conventionally, as this kind of loading material separating apparatus,
As a separation member, a member using abrasive particles (hereinafter referred to as a grinding stone) is generally known. Hereinafter, a conventional loading material separation apparatus using the grinding wheel will be described with reference to the drawings. FIG. 4 is a schematic configuration diagram of an apparatus using a conventional stacked material separation apparatus provided with a grindstone as a separation member. FIG. 5 is a schematic configuration diagram of the stacked material separating apparatus shown in FIG. The paper 1 placed on the mounting table 2 and nipped by the delivery roller 3 and the delivery roller pressing plate 4 is guided by the lower guide plate 6 forming the lower side of the transport path by the rotation of the delivery roller 3 and transported. It is transported in the direction of the roller 5 and the separation roller 7 and the like. The transported paper 1 has its front end in contact with a separation roller 7 or the like and is separated in a wedge shape by a grindstone 8, and the lowermost paper is guided to a nip with the rotation of the transport roller 5 and is separated from the transport roller 5. Roller 7
Is guided by the lower guide plate 6 and transported. The transported paper 1 is guided by the lower guide plate 6 by the driving roller 10 and the driven roller 11 and is radiated by the light source 15 when transported to the position of the transparent glass plate 17, and the reflected light thereof is reflected by the mirror 16 and the lens unit 18. , Reaches the photoelectric conversion element 19, and is converted into an electric signal, whereby an image formed on the sheet 1 is read. The sheet 1 that has passed through the transparent glass plate 17 is guided and conveyed by the lower guide plate 6, and is discharged by the driving roller 12 and the driven roller 13. The driven rollers 11 and 13 are pressed by the leaf springs 14 so as to contact the driving rollers 10 and 12, respectively.

Next, the loading material separating apparatus will be described.
As shown in FIG. 5, a grindstone 8 and a torque limiter 9 are provided coaxially outside the separation roller 7 in the axial direction, and a grindstone 8 is provided coaxially outside the torque limiter 9. . Then, only the separation roller 7 is
, And following the rotation of the transport roller 5, the two grinding wheels 8, 8 and the torque limiter 9 are fixed.
The torque limiter 9 manages the torque of the separation roller 7 so as not to rotate the separation roller 7 until the torque reaches a certain constant torque. That is, when the paper 1 does not enter the nip formed by the transport roller 5 and the separation roller 7 or when only one sheet enters, the rotating power of the transport roller 5 is
, The torque limiter 9 causes the separation roller 7 to be driven by the rotating force transmitted to the separation roller 7. On the other hand, when two sheets of paper 1 enter the nip, the rotational force of the transport roller 5 is not sufficiently transmitted to the separation roller 7 because the friction coefficient between the sheets 1 is low, and the separation roller 7 is It stops without being driven by the transport roller 5.
As a result, the paper 1 that has contacted the separation roller 7 and the grindstone 8 remains at the nip, and only the paper 1 that is in contact with the transport roller 5 is transported.

In addition to the above, a member having a large friction coefficient may be used as a separating member.
No. 330, JP-A-3-195643),
It is known to use knurled metal members directly on the surface as separating members.

[0005]

However, according to the above configuration using the grindstone 8 as the separating member, since the abrasive grains having the same particle diameter adhere to the entire circumference of the grindstone 8, the paper 1 is transported by the transport roller 5 When the paper passes through the nip formed by the separation roller 7, there is a problem in that the paper passing surface is rubbed with abrasive particles having a coarse particle diameter, thereby damaging the paper 1. Also, Japanese Patent Laid-Open No.
Also in the technology described in Japanese Patent Application Laid-Open No. 127327/1995 and Japanese Patent Application Laid-Open No. 3-195643, since a member having a large friction coefficient forms a part of the paper transport path, the separated paper may be subjected to friction when transported. There is a problem in that the sheet is rubbed with a member having a large coefficient to damage the sheet.
In addition, the method of separating paper using a metal member directly cut with knurls on the surface has a problem that the separation performance is generally lower than the method of using a grindstone as a separation member. Further, there is a problem that it takes time to form knurls on the metal surface.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to form a separation member by a simple processing method so that the separation performance of a stacking material is high and the separated stacking is performed. It is an object of the present invention to provide a loading material separation device that can transport a loading material without damaging the loading material.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a separating member and a guide member are provided across a transport path of a loading material, and the loading material is provided with the separating member. In the stacking material separation device, which is driven from the side on which the guide member is provided with respect to the transport path, and the separation member has abrasive particles adhered to the peripheral surface where the leading end of the stacking material which has been double fed is bumped. Of the two peripheral surface regions adjacent to each other with a boundary parallel to the axis, a member having abrasive grains adhered to only one region is separated by a distance that is slightly larger than the thickness of the loading material. It is characterized in that the separation member is arranged so as to face the transport path. Further, in the invention according to claim 2, a separating member and a guide member are provided across the transport path of the loading material, and the loading material is driven from the side where the guide member is provided with respect to the transport path. In the loading material separating apparatus, wherein the separating member has abrasive particles attached to the peripheral surface where the leading end of the double-fed loading material collides, the abrasive particles are attached to a predetermined peripheral surface region having a boundary parallel to the axis. The member to which is attached is disposed so that the boundary is closer to the transport path than the other peripheral surface portion, and is opposed to the transport path at a distance slightly larger than the thickness of the stacking material. It is characterized by constituting a separating member. Further, according to the invention of claim 3, a separating member and a guide member are provided across the transport path of the loading material, and the loading material is driven from the side where the guide member is provided with respect to the transport path. In the loading material separation device, wherein the abrasive is attached to the peripheral surface where the leading end of the loaded loading material hits, the two separating surfaces adjacent to each other across a boundary parallel to the axis. In the area, a member with abrasive grains of different particle diameters attached,
The separation member is formed by arranging the boundary so as to face the transport path at a distance slightly larger than the thickness of the loading material. According to a fourth aspect of the present invention, a separation member and a guide member are provided across a transport path of the loading material, and the loading material is driven from the side where the guide member is provided with respect to the transport path. In the loading material separation device, wherein the abrasive is attached to the peripheral surface where the leading end of the loaded loading material hits, the two separating surfaces adjacent to each other across a boundary parallel to the axis. The separation member is configured by arranging members having different amounts of abrasive grains attached thereto in the region so that the boundary faces the transport path at a distance slightly larger than the thickness of the load material. It is characterized by the following.

[0008]

According to the present invention, the loading material transported from the upstream side in the loading material transport direction is separated upstream from the boundary formed on the separation member, and the separated loading material is located downstream from the boundary, that is, the abrasive. It acts so as to pass through a portion where no grains are attached, a portion where abrasive grains having a relatively small grain size are attached, or a portion where the amount of attached abrasive grains is relatively small.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an image reading apparatus will be described below with reference to the drawings. In the present embodiment, the same components as those shown in FIGS. 4 and 5 for describing the above-described conventional technology are denoted by the same reference numerals as in FIGS. FIG. 1 is a perspective view illustrating a schematic configuration of a stacked material separating apparatus according to the present embodiment. FIG. 2 (a), (b)
FIG. 2 is a diagram of the stacked material separating apparatus according to the present embodiment as viewed from the axial direction. The configuration of the present embodiment will be described with reference to FIGS. 1 and 2A and 2B. A grindstone 20 is provided on both sides of the roller body formed by the separation roller 7 and the torque limiter 9 on the same axis. . The transport roller 5 is disposed at a position facing the separation roller 7. Here, the grindstone 20 and the torque limiter 9 are fixed, and only the separation roller 7 is driven by the rotation of the transport roller 5. Torque limiter 9
Manages the torque of the separation roller 7 in the same manner as in the above-mentioned prior art. A notch 204 as shown in FIG. 2 is formed in the grindstone 20 in the axial direction. This notch 20
Numeral 4 is provided on the downstream side in the transport direction of the grindstone 20. If the gap between the lower guide plate 6 and the grindstone 20 is δ, the gap δ is a point A
Is formed to form a notch 204 so as to form an angle θ between a line drawn perpendicular to the lower guide plate 6 and the boundary 203, so that the thickness is slightly larger than the thickness of one sheet of paper 1. ing. Here, suppose that the grinding stone 20 is notch 20
In the case of a perfect circle having no 4, δ is almost 0. The circumferential portion of the grindstone 20 has an abrasive grain attaching portion 201 and an abrasive grain non-adhering portion 2.
02 is formed.

Next, the operation of this embodiment will be described.
As in the prior art, the feed roller 3 is guided by the lower guide plate 6 by rotation of the feed roller 3 and is conveyed in the directions of the conveying roller 5 and the separation roller 7. The conveyed sheet 1 has its front end in contact with the separation roller 7 and the like, and is separated in a wedge shape by the abrasive grain attaching portion 201 of the grindstone 20. Then, the lowermost sheet is conveyed to the downstream side from the front end thereof through the gap δ, through the nip formed by the conveying roller 5 and the separation roller 7 as the conveying roller 5 rotates. In the present embodiment, a gap δ slightly larger than the thickness of one sheet of paper 1 is formed between the lower guide plate 6 and the grindstone 20 as described above, and Is the notch 20
4, when the lowermost sheet in contact with the transport roller 5 passes through the nip between the transport roller 5 and the separation roller 7, the uppermost surface of the lowermost sheet does not adhere to the grindstone 20. , Thus not damaging its surface. Further, in the present embodiment, if the notch 204 is formed in the grindstone 20 in advance, the abrasive particles can be sprayed without masking, so that the abrasive particles spraying operation can be simplified.

FIGS. 3 (a) to 3 (c) show whetstones 20 respectively.
It is a figure showing other examples about. The grindstones 20 shown in these figures are not provided with the cutouts 204 unlike the above-described embodiment, and are perfect circles when viewed from the axial direction. The boundary 20
The position of 3 is the same as the position shown in the above embodiment. Then, the sheet 1 conveyed on the upstream side in the sheet conveyance direction from the boundary 203 is separated, and the conveyance roller 5 and the separation roller 7 are separated on the downstream side.
Serves to hold down the paper 1 conveyed by the printer. FIG.
3A shows a configuration in which abrasive particles for sheet separation are attached to the upstream side in the sheet transport direction with the boundary 203 as a boundary, and no abrasive particles are attached to the downstream side. In order to achieve such a configuration, a portion to which no abrasive grains are attached may be masked, and then the abrasive grains may be sprayed to a portion where no masking has been applied. FIG. 3B shows that abrasive grains are sprayed without masking on the upstream side in the sheet conveying direction with respect to the boundary 203, and the boundary 2
This is an example in which a small amount of abrasive grains adhere to the downstream side in the sheet transport direction from the sheet No. 03. Generally, since the amount of abrasive particles attached to the downstream side in the sheet transport direction from the boundary 203 in this manner is extremely small,
The transported paper is hardly damaged, and the object of the present invention can be sufficiently achieved. FIG. 3C shows the boundary 20.
The grain size of the abrasive grains on the upstream side and the downstream side in the paper transport direction is made different from each other at the boundary 3. Specifically, abrasive grains having a large particle diameter are attached to the upstream side in the sheet transport direction, and abrasive grains having a smaller particle diameter than the upstream side are attached to the downstream side. When the paper 1 is conveyed, the abrasive particles on the downstream side
Ultra-fine abrasive grains that do not damage the paper surface. Here, according to the experiment of the inventor, the gap δ, the quality of the paper,
Depending on the surface condition, the number of abrasive grains is JIS standard # 400
Above, the result showed that the scars became almost inconspicuous. Generally, sanding or the like is a method of determining how many abrasive grains having a certain particle size are required in a certain area, and the particle size is not always uniform. Further, the paper separating effect of the grindstone will be described. The paper separating effect of the grindstone is generally determined by the abrasive particle diameter and the abrasive grain density. The inventor conducted an experiment on the paper separating effect of the grindstone. As a result, it was found that the more uniform the particle size, the better the paper separating performance, and that the paper was less likely to be damaged. Therefore, based on the above experimental results, FIG.
If abrasive grains having a size defined by S standard # 400 or more are uniformly adhered and used, scars on the surface of the paper 1 are hardly noticeable. In addition, if abrasive grains having a uniform particle diameter are attached downstream of the boundary 203 in FIG. Double feeds can be separated without noticeable scratches.

3A to 3C, it is not necessary to machine the notch 204 in the grindstone 20 and the grindstone 20 can have a simple shape (a perfect circle in this embodiment). Without deteriorating the separation performance for paper 1
Damage to the paper 1 can be reduced. Further, since the sheet 1 conveyed by the conveyance roller 5 and the separation roller 7 is pressed downstream of the boundary 203 in the sheet conveyance direction, the conveyance of the sheet while passing through the separation device can be stabilized. FIG.
According to the embodiment shown in (a), since no abrasive particles are attached downstream of the boundary 203 in the paper transport direction, the paper 1
When is transported by the transport roller 5, the surface thereof is not damaged. Further, according to the embodiment shown in FIG. 3B, the spraying operation of the abrasive grains can be performed without masking, so that the spraying operation can be simplified. FIG. 3 (c)
According to the embodiment shown in the above, the abrasive grains having a large particle diameter are provided on the upstream side in the sheet transport direction from the boundary 203, and the abrasive grains having a separation effect with a smaller particle diameter than the upstream-side abrasive grains are provided on the downstream side. Is attached, and the multi-fed paper can be separated efficiently without causing noticeable scratches.

[0013]

According to the first aspect of the present invention, since the grindstone is provided as the separation member, the separation performance of the loaded material is higher than the separation by the knurling, and the boundary formed on the separation member is sandwiched. Abrasive particles adhere to only one of the two adjacent peripheral surface areas, and a gap slightly larger than the thickness of the loading material is formed between the transport path and the boundary, so that the upstream side of the boundary If the abrasives are attached only to the surface, there is an effect that the loading material separated on the upstream side from the boundary does not damage the surface when passing through the downstream side. According to the second aspect of the present invention, since the grindstone is provided as the separation member, the separation performance of the stacked material is higher than the separation by the knurl, and the boundary formed on the separation member is closest to the transport path. Therefore, the loading material separated on the upstream side of the boundary does not contact the separation member on the downstream side of the boundary, and there is an effect that the surface thereof is not damaged when passing the downstream side. According to the invention of claim 3, since the grindstone is provided as the separation member, the separation performance of the loaded material is higher than the separation by the knurl, and for example, the grinding wheel on the upstream side downstream from the boundary formed on the separation member. If abrasive particles smaller than the grain size are attached, even if the loaded material cannot be separated upstream of the boundary and double-fed, it will be efficiently double-fed without causing noticeable scratches downstream of the boundary. There is an effect that paper can be separated. According to the invention of claim 4, since the grindstone is provided as the separation member, the separation performance of the loaded material is higher than the separation by the knurl, and for example, the grinding wheel on the upstream side downstream from the boundary formed on the separation member. If a smaller amount of abrasive particles is attached than the grain size, even if the loaded material cannot be separated upstream of the boundary and is double-fed, it will be efficiently double-fed without causing noticeable scratches downstream of the boundary. There is an effect that paper can be separated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a stacking material separating apparatus according to an embodiment.

FIGS. 2A and 2B are explanatory views of the loading material separation device shown in FIG. 1 as viewed from an axial direction.

FIGS. 3A to 3C are explanatory views of another embodiment of the separating member according to the embodiment.

FIG. 4 is a front view showing a schematic configuration of an apparatus using a conventional loading material separation apparatus provided with a grindstone as a separation member.

FIG. 5 is a perspective view showing a schematic configuration of the stacking material separating device shown in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper 5 Transport roller 6 Lower guide plate 7 Separation roller 9 Torque limiter 20 Grinding stone 201 Abrasive grain attaching part 202 Abrasive grain non-adhering part 203 Boundary 204 Notch

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-127330 (JP, A) JP-A-3-195643 (JP, A) JP-A 4-24532 (JP, U) JP-A 55- 90648 (JP, U) Fully open sho 59-100742 (JP, U) Fully open sho 60-117348 (JP, U) Fully open sho 58-69842 (JP, U) (58) Field surveyed (Int. ⁷ , DB name) B65H 3/52 310 G03G 15/00 514 H04N 1/00 108

Claims (4)

(57) [Claims] 1. A separation member and a guide member are provided across a transport path of a loading material, and the loading material is driven from the side where the guide member is provided with respect to the transport path, The separation member is a stacked material separation device in which abrasive grains are adhered to a peripheral surface where the leading end of the stacked stacked material is bumped, wherein, among two peripheral surface regions adjacent to each other across a boundary parallel to an axis, A member having abrasive particles adhered to only one area is arranged so that the boundary faces the transport path at a distance slightly larger than the thickness of the loading material, thereby constituting the separation member. Loading material separation device. 2. A separation member and a guide member are provided so as to sandwich a conveyance path of a stacking material, and the stacking material is driven from a side where the guide member is provided with respect to the conveyance path, In the loading material separation device, wherein the separation member has abrasive particles attached to the peripheral surface where the leading end of the loaded material overlaps, the abrasive particles are attached to a predetermined peripheral surface region having a boundary parallel to the axis. The member is disposed such that the boundary is closer to the transport path than the other peripheral surface portion and is opposed to the transport path at a distance slightly larger than the thickness of the stacking material, thereby forming the separating member. A loading material separating device, characterized in that: 3. A separation member and a guide member are provided so as to sandwich a transport path of the loading material, and the loading material is driven from a side of the transport path where the guide member is provided, The separation member is a stacked material separation device in which abrasive grains are attached to a peripheral surface where the tip of the stacked material that has been double-fed comes into contact with, and each of two separated peripheral surfaces adjacent to each other across a boundary parallel to an axis. A member to which abrasive grains having different particle diameters are attached is arranged so that the boundary faces the transport path at a distance slightly larger than the thickness of the loading material, and the separation member is configured. Loading material separation device. 4. A separation member and a guide member are provided so as to sandwich a transport path of the loading material, and the loading material is driven by a side of the transport path where the guide member is provided, The separation member is a stacked material separation device in which abrasive grains are attached to a peripheral surface where the tip of the stacked material that has been double-fed comes into contact with, and each of two separated peripheral surfaces adjacent to each other across a boundary parallel to an axis. A member to which different amounts of abrasive grains are attached is arranged so that the boundary faces the transport path at a distance slightly larger than the thickness of the loading material, thereby constituting the separation member. Loading material separation device.