JP2018179139A - Roller, separation device, image reading device, and recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To structurally realize collapse of a roller surface at the time of roller transportation in a well-balanced manner without depending on material selection and to improve shape accuracy of a roller outer peripheral surface as a molded article.SOLUTION: A roller 1 comprises: a shaft 62; and an elastic body part 64 provided on an outer peripheral surface of the shaft 62. The elastic body part 64 comprises: an inner peripheral part 66 at a shaft 62 side; an outer peripheral part 68 at an outer peripheral side with respect to the inner peripheral part 66; a plurality of first connection parts 70 connecting the inner peripheral part 66 and the outer peripheral part 68; and a plurality of second connection parts 72 being provided in a space part 80 between adjacent first connection parts 70 and 70 and partitioning the space part 80 into one X1 side and the other X2 side in an axial direction X of the roller 1. The first connection parts 70 are inclined in the same direction in a circumferential direction E with respect to a radial direction D of the roller 1.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a roller used for transporting a medium such as paper, a separation device including the roller, and an image reading device such as a scanner and a recording device.

In this type of roller, when the surface of the roller is conveyed in contact with the surface of the medium in order to secure the conveyance performance for various media, the contact surface is elastically crushed slightly, and the surface of the medium It is desirable that the contact area with the surface of the roller be large. Conventionally, the above-mentioned crushing has been realized using a foamed rubber material as the material of the roller.
In addition, there is also one that realizes the above-mentioned crushing using an elastomer separately from the foamed rubber material (Patent Document 1 and the like).

JP 2008-241739 A

However, in order to secure the conveyance performance of the roller by the foamed rubber material, a material with high characteristics is required, and there is a problem that the cost is increased. In addition, cracks tend to occur with time as a starting point of the foamed portion, and when the deformation is repeated, the shape is less likely to be restored, and as a result, the durability of the roller is lowered.
There is no problem that in a roller using an elastomer separately from the foamed rubber material, cracking tends to occur starting from the foamed portion such as the foamed rubber material, but the elastomer usually has higher rubber hardness than the foamed rubber material. Therefore, in order to secure the roller transport performance due to the above-mentioned collapse, it is difficult to select an appropriate material, and the degree of freedom in selection becomes low. As a result, there is a problem of cost increase.
In addition, there are the following problems in terms of roller production.
The roller is generally manufactured by injecting and filling a raw material into a mold as in insert molding and the like. In insert molding or the like, it is necessary to secure fluidity when the raw material is poured into a mold and filled, but in a structure in which the roller penetrates from one side surface to the other side surface in the axial direction It is difficult to ensure the fluidity, and the time required to complete the filling tends to be long. Therefore, the heat history at the time of curing the raw material is likely to vary depending on the place, and there is a problem that the shape accuracy of the outer peripheral surface of the roller as a final molded product is easily reduced.

  An object of the present invention is to achieve structural collapse of the surface during conveyance for securing the conveyance performance of the roller, not by material selection. In addition, even in the case where the roller is manufactured by injecting and filling a raw material into a mold as in insert molding or the like, it is possible to easily suppress the reduction in the shape accuracy of the outer peripheral surface of the roller as a final molded product. It is to

  The roller according to the first aspect of the present invention for solving the above-mentioned problems is a roller comprising a shaft and an elastic body portion provided on the outer peripheral surface of the shaft, wherein the elastic body portion is the shaft Of the first connecting portion adjacent to the inner peripheral portion which is the side, the outer peripheral portion which is the outer peripheral side with respect to the inner peripheral portion, a plurality of first connecting portions connecting the inner peripheral portion and the outer peripheral portion A plurality of second connecting portions provided in the space portion between the first and second portions for dividing the space portion into one side and the other side in the axial direction of the roller, wherein the first connecting portion extends in the radial direction of the roller It is characterized in that it is inclined in the same direction in the circumferential direction.

  Here, “inclining” means, in this specification, a structure in which the first connecting portion has a linear shape in a side view of the roller and is inclined with respect to the radial direction from the center of the roller. In addition, it is used in the sense that the side view has a curved shape and includes a structure inclined with respect to the radial direction.

According to this aspect, since the plurality of first joining portions are inclined in the same circumferential direction with respect to the radial direction from the center of the roller, the roller is pressed against the medium such as paper to carry Can be easily crushed by the inclined structure of the first connection portion to increase the contact area. Supplementally, even if the elastic body portion is made of a material having high rubber hardness, it can be easily crushed by the inclined structure to increase the contact area.
The mechanism of the roller collapse in this aspect is described below.
When the roller is pressed against the medium and a pressing force toward the center of the roller is applied, the first connecting portion is pressed against both the connecting portion with the inner peripheral portion and the connecting portion with the outer peripheral portion in the pressing direction Parallel and opposite forces (shears) act respectively. If the first connecting portion is a rigid body, the force mainly "sways" the first connecting portion by the force, but in the present embodiment, since the first connecting portion is also an elastic body, "Shrink in the direction" can also. That is, when the pressing force is applied to the roller, the first connecting portion of this aspect can "shrink" while "swinging". The collapse can be realized by this behavior.
Thereby, crushing of the roller surface at the time of conveyance for securing the conveyance performance of the roller can be easily realized structurally without depending on material selection.
In addition, in the case of manufacturing the roller by insert molding or the like, the flowability of the raw material can be easily secured due to the presence of the second joining portion, thereby reducing the shape accuracy of the outer peripheral surface of the roller as a final molded product. Can be suppressed.

In the roller according to the second aspect of the present invention, in the first aspect, the second connecting portion is inclined with respect to a plane orthogonal to the axis of the roller, and the second connecting portions are adjacent via the first connecting portion. The connecting portion is characterized in that the direction of the inclination is reverse.
Here, “inclination” means, in this specification, a linear shape in the longitudinal sectional view of the second connecting portion and a curved shape in the longitudinal sectional view in addition to the structure inclined with respect to the surface. It is used in the sense that it includes a structure that is inclined with respect to the surface.

According to this aspect, since the second connecting portion is inclined with respect to a plane orthogonal to the axis of the roller, when the pressing force is applied to the roller, the second connecting portion is the same as the first connecting portion. It is possible to "shrink" while "swinging".
Furthermore, since the direction of the said inclination is reverse for the 2nd connection part adjacent via the said 1st connection part, the relationship where the said rocking | fluctuation of adjacent 2nd connection parts mutually negates via the said 1st connection part. As a result, the deformation of shrinkage in the longitudinal direction occurs, and the crushing of the roller can be realized in a well-balanced manner. In other words, since the direction of the inclination of the second connecting portions adjacent to each other via the first connecting portion is opposite, the device width direction (axial direction) generated by the swinging of the second connecting portion The forces are in a mutually offset relationship, and the crushing of the rollers can be realized in a well-balanced manner.

  In the roller according to the third aspect of the present invention, in the second aspect, the one side recess formed on one side in the axial direction of the roller and the other side recess formed on the other side with respect to the second joining portion are surfaces. It is characterized by having a symmetrical structure.

  According to this aspect, the one side concave portion and the other side concave portion in the axial direction of the roller have a plane symmetrical structure with the second joining portion as a boundary, and further, the structure in which the plane symmetrical structure is opposite in the circumferential direction adjacent to each other As a result, the roller can be crushed in a more balanced manner when the pressing force is applied to the roller.

  The roller according to the fourth aspect of the present invention is characterized in that, in any one of the first to third aspects, the constituent material of the elastic body portion is a non-foaming material.

  According to this aspect, since the constituent material of the elastic body portion is a non-foaming material, there is no problem that cracks occur with time due to the foaming site.

  In the roller according to the fifth aspect of the present invention, in the aspect according to any one of the first to fourth aspects, the elastic body portion is an inner layer portion which is on the shaft side and an outer layer which is in contact with the medium. The inner layer portion includes the first connecting portion, the second connecting portion, the inner peripheral portion, and the outer peripheral portion.

According to this aspect, the elastic body portion of the roller can be applied also to the two-layer structure, and the effects of the respective aspects can be obtained.
In addition, in this two-layer structure, when the raw material has low flowability during manufacture by insert molding or the like, there is a problem that the shape accuracy of the outer layer portion of the roller as a final molded product tends to decrease. According to this aspect, since the flowability can be improved by the second connecting portion, the occurrence of the above problem can be suppressed.

In the roller according to the sixth aspect of the present invention, in the aspect according to any one of the first to fifth aspects, the inclination angle of the first joining portion is 30 ° or more with respect to the radial direction of the roller , It is characterized.
According to this aspect, when the inclination angle of the first connecting portion is 30 ° or more with respect to the radial direction of the roller, the crushing of the roller can be stably realized.

In the roller according to the seventh aspect of the present invention, in the aspect according to any one of the first to sixth aspects, the inclination angle of the second joining portion is 60 ° or less with respect to the axial direction of the roller , It is characterized.
According to this aspect, since the inclination angle of the second connecting portion is 60 ° or less with respect to the axial direction of the roller, the crushing of the roller can be stably realized.

In the roller according to the eighth aspect of the present invention, in the aspect according to any one of the first to seventh aspects, the one-side recess formed on one side in the axial direction of the roller bordering on the second joining portion The number of the other side recesses that can be on the other side is six or more.
According to this aspect, the number of the one-side recess formed on one side in the axial direction of the roller and the other-side recess formed on the other side bordering on the second joining portion is in the above range, the roller is crushed Can be realized stably.

A separating apparatus according to a ninth aspect of the present invention comprises: a feeding roller; and a retarding roller for separating a medium other than the medium to be conveyed from the bundle of media in pair with the feeding roller and returning the same upstream. The retard roller is a roller described in any one of the first to eighth aspects.
According to this aspect, an effective separating device can be realized by the pair of the feeding roller and the retard roller.

In the separating device according to a tenth aspect of the present invention, in the ninth aspect, the direction of the inclination of the first connecting portion is the inner side of the first connecting portion when the roller receives a pressing force from the medium. The apparatus is characterized in that the direction of swinging around a connecting portion with the peripheral portion is attached so as to return the medium to the upstream side.
According to this aspect, when the retard roller receives a pressing force from the medium, the first connecting portion slightly swings, but the swing can be used to return the medium upstream. Therefore, an effective separation device can be realized.

An image reading apparatus according to an eleventh aspect of the present invention is an image comprising: a reading unit for reading image information of a medium; and a roller provided on a medium conveyance path passing through a reading execution area of the reading unit to apply a feeding force to the medium. The reading device, wherein the roller has a structure in which the contact surface elastically collapses when pressed against the medium, and at least one of the rollers is any one of the first to eighth aspects. It is characterized by being a roller described in the embodiment.
According to this aspect, it is possible to obtain the effects described in the respective aspects as an image reading apparatus.

A recording apparatus according to a twelfth aspect of the present invention is a recording apparatus comprising: a recording unit; and a roller provided on a medium conveyance path passing through a recording execution area of the recording unit to apply a feed force to the medium, the roller Wherein the contact surface is elastically crushed when pressed against the medium, and at least one of the rollers is a roller described in any one of the first to eighth aspects. It is characterized by
According to this aspect, the effects described in the respective aspects can be obtained as the recording apparatus.

FIG. 1 is a perspective view illustrating an appearance of an image reading apparatus according to a first embodiment of the present invention. FIG. 1 is a main part cross-sectional view showing an image reading apparatus according to a first embodiment of the present invention. The principal part sectional view showing the separation device concerning Embodiment 2 of the present invention. The perspective view showing the roller which concerns on Embodiment 3 of this invention. The AA sectional view in Drawing 4 showing the roller concerning embodiment 3 of the present invention. The BB sectional drawing in FIG. 4 showing the roller which concerns on Embodiment 3 of this invention. The side view showing the roller which concerns on Embodiment 3 of this invention. CC sectional drawing in FIG. 7 showing the roller based on Embodiment 3 of this invention. The DD sectional drawing in FIG. 7 showing the roller which concerns on Embodiment 3 of this invention. Explanatory drawing which represents the mode of the flow of the raw material at the time of insert molding of the roller which concerns on Embodiment 3 of this invention compared with the prior art example which has a penetration part in the axial direction. It is a graph showing the relation between the number of compressions and the deformation rate due to the difference in raw materials. The side view in case the inclination angle of the 1st connection part showing the roller which concerns on Embodiment 3 of this invention is 60 degrees. The side view in case the inclination angle of the 1st connection part showing the roller which concerns on Embodiment 3 of this invention is 45 degrees. The side view in case the inclination angle of the 1st connection part showing the roller which concerns on Embodiment 3 of this invention is 30 degrees. The side view in case the inclination angle of the 2nd connection part showing the roller which concerns on Embodiment 3 of this invention is 30 degrees. The side view in case the inclination angle of the 2nd connection part showing the roller which concerns on Embodiment 3 of this invention is 45 degrees. The side view in case the inclination angle of the 2nd connection part showing the roller which concerns on Embodiment 3 of this invention is 60 degrees. The side view in case the number of one side recessed part and the other side recessed part showing the roller which concerns on Embodiment 3 of this invention is six. The side view in case the number of the one side recessed part and the other side recessed part showing the roller which concerns on Embodiment 3 of this invention is eight. The side view in case the number of one side recessed part and the other side recessed part showing the roller which concerns on Embodiment 3 of this invention is twelve. The side view which shows the modification which varied the shape of the 1st connection part showing the roller which concerns on Embodiment 3 of this invention. The side view which shows the modification which varied arrangement | positioning of the one side recessed part and the other side recessed part which represents the roller which concerns on Embodiment 3 of this invention. The longitudinal cross-sectional view which shows an example of the bonded structure of the inner-layer part which represents the roller which concerns on Embodiment 3 of this invention, and an outer-layer part. The longitudinal cross-sectional view which shows another example of the bonded structure of the inner-layer part which represents the roller which concerns on Embodiment 3 of this invention, and an outer-layer part. The longitudinal cross-sectional view which shows another example of the bonded structure of the inner-layer part which represents the roller which concerns on Embodiment 3 of this invention, and an outer-layer part. The longitudinal cross-sectional view which shows another example of the bonded structure of the inner-layer part which represents the roller which concerns on Embodiment 3 of this invention, and an outer-layer part. The longitudinal cross-sectional view which shows another example of the bonded structure of the inner-layer part which represents the roller which concerns on Embodiment 3 of this invention, and an outer-layer part. The longitudinal cross-sectional view which shows another example of the bonded structure of the inner-layer part which represents the roller which concerns on Embodiment 3 of this invention, and an outer-layer part. The longitudinal cross-sectional view which shows another example of the bonded structure of the inner-layer part which represents the roller which concerns on Embodiment 3 of this invention, and an outer-layer part. The perspective view showing the roller concerning Embodiment 4 of this invention. The side view showing the roller which concerns on other embodiment of this invention. The longitudinal cross-sectional view showing the roller which concerns on other embodiment of this invention.

First, taking the image scanner of the continuous automatic feeding method according to the first embodiment shown in FIG. 1 and FIG. 2 as an example of the image reading apparatus of the present invention explain. Next, the configuration of the separating apparatus and the outline of the separating operation will be described by taking the separating apparatus according to the second embodiment shown in FIG. 3 mounted on the image reading apparatus as an example of the separating apparatus of the present invention.
Subsequently, the roller according to the embodiment of the present invention and its formation and operation will be specifically described by taking the roller according to the third embodiment shown in FIGS. 4 to 18 applicable to the retard roller of the separating device as an example. Furthermore, as the roller according to the fourth embodiment of the present invention, the roller according to the third embodiment is different from the roller according to the third embodiment, and the configuration of the roller and the function thereof are mainly different from the third embodiment. Explain to.
Finally, the configuration of the roller according to another embodiment of the present invention which is different in configuration from the third and fourth embodiments and the embodiment in which the roller of the present invention is applied to a recording apparatus will be mentioned.

◆ ◆ Embodiment 1 ◆ ◆
(1) Outline of the overall configuration of the image reading apparatus (see FIGS. 1 and 2)
The illustrated image reading apparatus 10 includes a lower unit 12, an upper unit 14, a cover 16, and a discharge tray 18. Although not shown, the upper unit 14 has a pivot on the downstream end of the lower unit 12 in the medium transport direction A, and the lower unit 12 can pivot via the pivot. It is attached to.

  Also, although not shown, the upper portion on the back side of the lower unit 12 also has a pivot, and the cover 16 is rotatably attached to the lower unit 12 via the pivot. ing. The cover portion 16 rotates to the rear side of the apparatus as shown in FIG. 1 and opens the feeding port 20 as shown in FIG. 1 and in a non-feeding state (not shown) covering the upper portion of the upper unit 14 and the feeding port 20. Possible states can be taken. Then, as shown in FIG. 1, when the cover portion 16 is in the feedable state, the back surface of the cover portion 16 is exposed to the front, and functions as a medium placement portion 16a on which the medium P is placed.

  Further, a discharge port 24 for discharging the medium P is provided on the device front side of the lower unit 12. The lower unit 12 also includes a discharge tray 18 that can be pulled out from the discharge port 24 toward the front of the apparatus. The discharge tray 18 is attached to the lower unit 12 so as to be able to be pulled out so that it can be housed in the bottom of the lower unit 12 (not shown) and pulled out to the front side of the apparatus (see FIG. 1). It is done. Further, the discharge tray 18 is configured by connecting a plurality of tray members, and the drawing length from the discharge port 24 can be adjusted with respect to the size of the medium P to be discharged.

(2) Configuration of Medium Transport Path in Image Reading Device Next, the configuration of the media transport path 26 in the image reading device 10 will be described based on FIG. In FIG. 2, only the outer shell of the lower unit 12 and the upper unit 14 are illustrated by imaginary lines. Further, a thick solid line to which a symbol P is attached in FIG. 2 illustrates a transportation locus of the medium P conveyed along the medium conveyance path 26 in the image reading device 10. The double-fed medium P (not shown) is separated by a separating device 60 described later, and is separated from the medium P conveyed toward the reading unit 52 so as to be left at the separation position.

  The bundle of media G whose leading end has been inserted into the feeding port 20 is set in a state of being supported by the above-described medium placement unit 16a as indicated by an alternate long and short dash line in FIG. In the medium placement unit 16a, a placement unit detection sensor 28 is provided. The placement portion detection sensor 28 is constituted by a contact type sensor having a lever or the like or an optical non-contact type sensor as an example, and when the medium P is set on the medium placement portion 16a, the detection signal is shown in FIG. Medium, it transmits to the control part 30 shown with a virtual line.

  Further, as shown in FIG. 1, the medium placement unit 16 a is provided with a pair of edge guides 22. The edge guides 22 are configured to be movable in directions approaching and away from each other in the device width direction X. When the medium P is set in the medium placement unit 16a, the guide surfaces of the edge guide 22 contact the left and right sides of the medium P in the apparatus width direction X, and the position of the medium P in the apparatus width direction X is restricted. And the feeding of the medium P toward the reading unit 52 is guided. The edge guide 22 in FIG. 1 shows the state of being most separated in the apparatus width direction X, that is, in the width direction of the medium P.

Of the bundle of media G set in the media placement unit 16a, the media P located at the lowermost position is directed to the downstream side in the media transport direction A by the feed roller 34 rotationally driven by a feed drive motor (not shown). Is fed. Although not shown, two feed rollers 34 are provided at intervals in the apparatus width direction X as an example. The outer peripheral surface of the feed roller 34 is made of a high friction material (for example, a synthetic rubber, an elastomer, or the like).
Further, before the start of feeding, a bundle of documents indicated by reference sign G in FIG. 2 is held at a feeding standby position shown in FIG. 2 by a stopper (not shown) at its leading end. There is a restriction on entry into and between.

Further, at a position facing the feeding roller 34, a retard roller 36, which is a component of the separating device 60 described later, is provided together with the feeding roller 34. Similar to the feed roller 34, two retard rollers 36 are provided in the apparatus width direction X, as an example. The retard roller 36 is provided in a state of being biased toward the feeding roller 34 by biasing means (not shown).
Further, the retard roller 36 is configured to be rotationally driven in a direction C opposite to the rotational direction B of the feed roller 34 by a transport drive motor (not shown), and the retard roller 36 is provided with a torque limiter 40. The retard roller 36 is configured to receive a drive torque of a transport drive motor (not shown) via the torque limiter 40.

  A first medium detection sensor 42 for detecting the feeding of the medium P is provided at a downstream position of the medium conveyance path 26 of the feeding roller 34 and the retard roller 36. Although not shown, the first medium detection sensor 42 is disposed, as an example, in the conveyance area of the medium P of the maximum size which can be fed in the apparatus width direction X of the medium conveyance path 26. The first medium detection sensor 42 is configured as an example of an optical noncontact sensor including a light emitting unit 42 a and a light receiving unit 42 b which are disposed at positions facing each other across the medium transport path 26. Then, when the medium P is conveyed to the medium conveyance path 26, the medium P intercepts the detection light from the light emitting unit 42a, whereby the feeding of the medium P is detected and the detection signal is transmitted to the control unit 30. Is configured.

  On the downstream side of the medium conveyance direction A of the first medium detection sensor 42 in the medium conveyance path 26, a double feed detection sensor 44 for detecting double feeding of the medium P is disposed in the medium transport area in the apparatus width direction X as an example. ing. The double feed detection sensor 44 includes a speaker unit 44a and a microphone unit 44b, and emits ultrasonic waves from the speaker unit 44a toward the medium P passing through the medium transport path 26, and the reflected sound from the medium P is a microphone It is comprised so that it may detect in the part 44b. Further, in the present embodiment, the double feed detection sensor 44 is configured not only to detect double feed of the medium P but also to detect the type of the medium P such as the thickness of the medium P based on the frequency of the reflected sound. There is.

  A transport roller pair 46 configured by including a transport driving roller 46 a and a transport driven roller 46 b is provided at a downstream position in the media transport direction A of the double feed detection sensor 44 in the media transport path 26. Further, at the downstream position of the conveyance roller pair 46 in the medium conveyance direction A, a second medium detection sensor 48 constituted by a contact type sensor having a lever as an example is provided.

  At the downstream position of the second medium detection sensor 48 in the medium conveyance direction A, a reading unit 52 that reads an image represented on the medium P as image information is provided. The reading unit 52 is provided along the medium conveyance path 26 with a first reading unit 52 A provided to the lower unit 12 so as to face the first surface which is the lower surface of the medium P conveyed along the medium conveyance path 26. And a second reading unit 52B provided in the upper unit 14 so as to face the second surface which is the upper surface of the medium P to be conveyed. The first reading unit 52A and the second reading unit 52B are, for example, configured as a contact-type image sensor module (CISM).

The medium P on which the image represented on at least one of the first surface and the second surface is read by the reading unit 52 is conveyed to the discharge roller pair 54 located at the downstream position of the medium conveyance direction A of the reading unit 52 Be done. The discharge roller pair 54 is configured by including a discharge drive roller 54a and a discharge driven roller 54b, and the medium P is nipped by the discharge roller pair 54 configured in this manner and discharged from the discharge port 24 to the outside. Be done.
The conveyance drive roller 46a of the conveyance roller pair 46 and the discharge drive roller 54a of the discharge roller pair 54 may be rotationally driven using one motor as a common drive source, or separate motors are used. It may be separately driven to rotate.

The image reading apparatus 10 according to the aspect of the present invention includes the reading unit 52 described above for reading image information of the medium P and the feeding force for the medium P provided on the medium conveyance path 26 passing through the reading execution area of the reading unit 52. And the various rollers 34, 36, 46, 54, etc. mentioned above. The rollers 34, 36, 46, 54, etc. have a structure in which the contact surface S elastically collapses when pressed against the medium P.
And at least one of these rollers 34, 36, 46, 54 grade | etc., Is comprised by the roller 1 of the aspect which concerns on this invention mentioned later. In the present embodiment, the retard roller 36 is configured by the roller 1 of the aspect according to the present invention.

◆ ◆ Embodiment 2 ◆ ◆
(1) Configuration of separation apparatus (see FIG. 3)
The illustrated separation device 60 includes a feed roller 34, and a retard roller 36 that separates the medium P from the bundle of media P in pairs with the feed roller 34 and returns the same upstream. It is comprised by the roller 1 of the aspect which concerns on this invention.
The roller 1 of the aspect which concerns on this invention is provided with the shaft 62 and the elastic-body part 64 provided on the outer peripheral surface of the shaft 62. As shown in FIG. The elastic body portion 64 of the roller 1 connects the inner peripheral portion 66 on the shaft 62 side, the outer peripheral portion 68 on the outer peripheral side with respect to the inner peripheral portion 66, and a plurality of connecting the inner peripheral portion 66 and the outer peripheral portion 68 Is provided in the space 80 between the first joint 70 and the adjacent first joint 70, and the space 80 is used in the axial direction X of the roller 1 (the same reference numeral as the device width direction X is used And a plurality of second connecting portions 72 that divide the side X1 into the side X2 and the other side X2.

Further, the first connecting portion 70 is provided in a state of being inclined in the same direction in the circumferential direction E with respect to the radial direction D of the roller 1.
As shown in FIG. 3, in the present embodiment, when the roller 1 receives the pressing force F from the medium P, the inclination direction of the first connecting portion 70 is connected to the inner peripheral portion 66 of the first connecting portion 70. The direction of rocking with the connecting portion Ji as the fulcrum when the connecting portion to the outer peripheral portion 68 of the first connecting portion 70 is Jo and the direction in which the medium P is returned upstream in the medium transport direction A It is attached so that it becomes R. As a matter of course, the direction of the swing around the connection portion Ji may be opposite to the direction R for returning the medium P to the upstream side in the medium transport direction A.

In the third embodiment, which will be described next, and the embodiment 3 to be described next, the elastic layer 64 further includes an inner layer 74 on the side of the shaft 62 and an outer layer 76 on the side contacting the medium P. The configuration including the first connecting portion 70, the second connecting portion 72, the inner peripheral portion 66, and the outer peripheral portion 68 described above with respect to the inner layer portion 74 is employed.
In the present embodiment, the outer layer portion 76 is configured as an example of a high friction material such as a synthetic rubber or an elastomer as in the case of the feeding roller 34 described above.

(2) Separation operation of separation device (see FIG. 3)
Next, the separation action of the medium P by the separation device 60 configured as described above is divided into (A) basic separation action and (B) specific separation action obtained by the roller 1 according to the embodiment of the present invention. I will divide and explain.
(A) Basic separation action When the rotational torque received from the feed roller 34 described above exceeds the limit torque of the torque limiter 40, the retard roller 36 drives the retard roller 36 by the torque limiter 40. , And is rotated clockwise as shown by the solid arrow C in FIG.

When feeding of the medium P is started and a plurality of media P enter between the feeding roller 34 and the retard roller 36, the retard roller 36 does not receive rotational torque from the feeding roller 34, and the feeding roller 34 The driven rotation stops. The retard roller 36 receives the driving force from the conveyance drive motor via the torque limiter 40 and rotates in the opposite direction (counterclockwise as indicated by the broken arrow R in FIG. 3) to the feeding roller 34. Get started.
As a result, the medium P to be prevented from being double fed in the upper layer except the lowest medium P to be fed can not receive the transport force for advancing to the downstream side in the medium transport direction A, and rotation of the retard roller 36 It is returned to the upstream side in the medium conveyance direction A, and double feeding of the medium P is prevented. Since the lowermost medium P to be fed is in direct contact with the feed roller 34, the medium P is transported downstream in the medium transport direction A by the transport force received from the feed roller 34.

(B) Specific separation action Before the medium P is supplied between the feed roller 34 and the retard roller 36, the feed roller 34 and the retard roller 36 are in contact with each other. When the feed force acts on the medium P of the lowermost surface of the medium bundle G set in the medium placement unit 16 a by the rotation of the feed roller 34, a plurality of media P is interposed between the feed roller 34 and the retard roller 36. Enters.
Since the retard roller 36 is not in contact with the feed roller 34 as described above by the medium P as described above, the follow-up rotation in the clockwise direction is stopped as shown by the solid arrow C in FIG. The rotation is started in the direction (counterclockwise as indicated by the broken arrow R in FIG. 3), and the second or more media P from the lowermost surface are returned upstream in the medium transport direction A.

Then, in the retard roller 36 to which the roller 1 according to the aspect of the present invention is applied, the pressing force F is directed from the medium P toward the retard roller 36 at the moment when the medium P enters between the feeding roller 34 and the retard roller 36 As a result, the outer peripheral surface of the retard roller 36 is slightly crushed.
In addition, when the outer peripheral surface of the retard roller 36 collapses, the first connecting portion 70 slightly swings the connecting portion with the inner peripheral portion 66 with Ji as a fulcrum, but the direction of the inclination is shown in FIG. In such a case, a slight counterclockwise rotation occurs instantaneously in FIG. The instantaneous rotation contributes to the action of returning the medium P to the upstream side in the medium transport direction A. Therefore, the separating action of the medium P can be realized effectively by the retard roller 36 according to the present embodiment to which the roller 1 according to the aspect of the present invention is applied.

◆ ◆ Embodiment 3 ◆ ◆
(1) Configuration of roller (see FIGS. 4 to 18)
As described above, the roller 1A according to the present embodiment includes the shaft 62 and the elastic body portion 64. The elastic body portion 64 includes the inner peripheral portion 66, the outer peripheral portion 68, the first connecting portion 70, and the second connecting portion. The first connecting portion 70 is inclined in the same direction in the circumferential direction E with respect to the radial direction D of the roller 1A.
Specifically, the shaft 62 is bridged to a suitable support member (for example, the upper unit 14) so as to extend horizontally in the axial direction X. The elastic body portion 64 has a two-layer structure including the inner layer portion 74 and the outer layer portion 76 as described above, and the inner circumferential portion 66, the outer circumferential portion 68, and the first portion described above with respect to the inner layer portion 74. A connecting portion 70 and a second connecting portion 72 are provided.

The outer layer portion 76 is a cylindrical member having a predetermined thickness in the radial direction D and a predetermined length in the axial direction X. A plurality of annular groove portions 78 are formed in the axial direction X on the outer peripheral surface in contact with the medium P. Are formed at a predetermined pitch. Further, the inner peripheral surface of the outer layer portion 76 is a bonding surface with the inner layer portion 74, and in the embodiment shown in FIGS. 4 to 9 and 12A to 15B, a smooth uniform cylindrical curved surface It is formed.
The inner layer portion 74 is provided with a small diameter inner circumferential portion 66 having a predetermined thickness in the radial direction D and having a predetermined length in the axial direction X, which is externally fitted to the shaft 62. The inner peripheral surface of the inner peripheral portion 66 is a fitting surface which is externally fitted to the shaft 62.

Further, the inner layer portion 74 is joined to the inner circumferential surface of the outer layer portion 76, has a predetermined thickness in the radial direction D, and is slightly smaller than the outer layer portion 76 having a predetermined length in the axial direction X An outer peripheral portion 68 is provided. The outer peripheral surface of the outer peripheral portion 68 is a bonding surface to be bonded to the inner peripheral surface of the outer layer portion 76.
The first connecting portion 70 is a member for connecting the inner peripheral portion 66 and the outer peripheral portion 68 together with the second connecting portion 72 described below, and in the embodiment shown in FIGS. 4 to 9, the inner peripheral portion 66 and the outer peripheral portion 68 As shown in the drawing, eight rectangular plate-like members having a uniform thickness and having the same length are disposed at equal intervals in the circumferential direction E in a state of being inclined.
In the embodiment shown in FIGS. 4 and 7, the first connecting portion 70 has a linear shape in a side view of the roller 1A, and adopts a structure in which the first connecting portion 70 is inclined with respect to the radial direction D from the center of the roller 1A. Although it is, it is not restricted to this. As described later (FIG. 20), it is also possible to adopt a structure in which the first connecting portion 70 has a curved shape in a side view of the roller 1A and is inclined with respect to the radial direction D.

On the other hand, the second connecting portion 72 is provided in a space portion 80 having a triangular or fan-shaped cross section formed between the adjacent first connecting portions 70, and the space portion 80 extends in the axial direction X of the roller 1A. As described above at the approximately intermediate position, the side surface shape divided into the one side X1 side and the other side X2 side is constituted by the plate-like member having a triangle or a sector shape.
Thus, in the roller 1A according to the present embodiment, the space 80 is a non-penetrating space 80 which is not penetrated in the axial direction X due to the presence of the second connecting part 72.

Further, in the present embodiment, as shown in FIGS. 5, 6, 8 and 9, the second connecting portion 72 is inclined with respect to the plane orthogonal to the axial direction X of the roller 1A, and the first connecting portion 72 The second connecting portions 72 (FIGS. 8 and 9) adjacent to each other through 70 are configured such that the direction of the inclination is reversed. Therefore, the respective second connecting portions 72 which partition the space portions 80 arranged at equal intervals in the circumferential direction E are provided such that adjacent ones have their inclination directions alternated with each other.
In the embodiment shown in FIG. 5, FIG. 6, FIG. 8 and FIG. 9, the second connecting portion 72 has a linear shape in its longitudinal cross section and is inclined with respect to the surface. However, it is not limited to this. As described later (FIG. 21), it is also possible to adopt a structure in which the second connecting portion 72 has a curved shape in a longitudinal sectional view and is inclined with respect to the surface.

In the space 80, a recess formed on one side X1 of the roller 1A in the axial direction X with the second connecting portion 72 as a boundary is referred to as a one side recess 82, and a recess formed on the other side X2 is the other side recess 84 Do. And these two recessed parts 82 and 84 are provided so that it may become plane-symmetrical structure like illustration.
Moreover, as a constituent material of the elastic body part 64 comprised in this way, a non-foaming material is preferable and 10 minutes of reaction force is employ | adopted by employ | adopting the structure provided with the 1st connection part 70 and the 2nd connection part 72, for example. If it can be realized to be 1 or less, it is possible to secure the amount of crushing of the outer peripheral surface of the roller 1A equal to or greater than the foamed rubber, even if materials of various rubber hardness are used.

Also, referring to the relationship between the number of compressions and the deformation rate due to the difference in the material of the elastic body 64 shown in FIG. 11, the amount of deformation of the foamed rubber gradually increases as the number of compressions increases, and the shape does not recover. On the other hand, it can be seen that in the non-foamed materials A15 elastomer and A20 elastomer, even if the number of compressions increases, the deformation amount is almost constant and the shape is recovered.
Therefore, in view of the durability, it can be said that a non-foamed synthetic rubber or elastomer is more preferable than a foam material such as a foam rubber, as a constituent material of the elastic body portion 64.

The inclination angle θ1 of the first connecting portion 70 is preferably 30 ° or more with respect to the radial direction D of the roller 1A, and 60 ° shown in FIG. 12A, 45 ° shown in FIG. 12B, and 30 shown in FIG. ° etc. can be adopted. Among them, 60 ° can be said to be the most practical inclination angle θ1 of the first connecting portion 70 in consideration of the magnitude of the reaction force and the like.
The inclination angle θ2 of the second connecting portion 72 is preferably 60 ° or less with respect to the axial direction X of the roller 1A, 30 ° shown in FIG. 13A, 45 ° shown in FIG. 13B, and 60 ° shown in FIG. ° etc. can be adopted. Among them, it can be said that 45 ° is the most practical inclination angle θ2 of the second connecting portion 72 in consideration of the magnitude of the reaction force and the like.

Further, it is preferable that the number of the one-side concave portion 82 formed on the one side X1 side in the axial direction X of the roller 1A bordering the second connecting portion 72 and the other-side concave portion 84 formed on the other X2 side be six or more. Specifically, six as shown in FIG. 14A, eight as shown in FIG. 14B, 12 as shown in FIG. Of course, it is not limited to these numbers.
Besides, the shape of the first connecting portion 70 is formed with a uniform thickness from the base end side connected with the inner peripheral portion 66 to the distal end side connected with the outer peripheral portion 68 as shown in FIGS. Besides, as shown in FIG. 15A, it is possible to adopt a configuration in which the width of the first connecting portion 70 is changed, for example, the thickness on the base end side is increased and the thickness on the tip end side is reduced. .

Further, a second space 86 is further formed with respect to the first joint 70 shown in FIG. 15A, and the second joint 72 is disposed in the middle of the second space 86 in the axial direction X. It is also possible to adopt an aspect of a structure in which the one-side concave portion 82 and the other-side concave portion 84 are doubled as shown in FIG. 15B.
Moreover, as a structure which improves the adhesiveness of the inner layer part 74 and the outer layer part 76, it is possible to employ | adopt the various joining structure shown to FIG. 16A-FIG. Specifically, as shown in FIG. 16A, chamfers 92 are applied to the edge on the one X1 side and the other X2 side of the inner peripheral surface of the outer layer 76, or the inner peripheral surface of the outer layer 76 is roughened as shown in FIG. 16B. Fine asperities 94 can be applied.

Further, as shown in FIG. 16C, the inner peripheral surface of the outer layer 76 before the insert molding of the inner layer 74 is subjected to a primer treatment, and the adhesive 96 is applied to the surface to bond the inner layer 74 and the outer layer 76. It is possible to
Further, as shown in FIGS. 17A, 17B, and 17C, it is possible to form a groove 98 on the inner peripheral surface of the outer layer portion 76, and the shape of the groove 98 has a trapezoidal shape or a cross section shown in FIGS. 17A and 17B. The shape may be triangular or rectangular, or may be an undercut shape such as a mushroom or dovetail groove having a head at the tip as shown in FIG. 17C. In addition to providing one groove 98 as shown in FIG. 17, it is possible to provide a plurality of grooves 98 as shown in FIGS. 17A and 17C.

Furthermore, as shown in FIG. 18, the joint structure of the composite structure combining the chamfer 92 described in FIGS. 16A, 16B, 16C and 17A, 17B, 17C described above, the fine unevenness 94, the adhesive 96 and the groove 98. It is also possible to adopt
In addition to the above, although not shown, the first connecting portion 70 can extend linearly in the side view of the roller 1A, or can extend in the shape of a curve in the side view. Similarly, the second connecting portion 72 may have a linearly extending shape in the longitudinal sectional view, or may have a curved shape in the longitudinal sectional view.

(2) Forming and action of the roller (see FIGS. 4 to 9, 10 and 11 to 18)
In order to form the roller 1A configured in this manner, insert molding in which the raw material 90 is injected and filled into a mold can be employed as an example. FIG. 10 shows a conventional product having a through hole 88 penetrating the space 80 of the roller 1 ′ in the axial direction X, and the one side recess 82 and the other side recess 84 not penetrating the space 80 of the roller 1A in the axial direction X. It shows an aspect of the flow of the raw material 90 of the product of the present invention constituted by
In this case, in the conventional product, it is difficult to ensure the fluidity of the raw material 90, and the time required to complete the filling tends to be long. Thereby, the heat history at the time of curing the raw material 90 is likely to vary depending on the place, and when it becomes a final molded product, the outer layer portion 76 of the roller 1 'is deformed and the shape accuracy of the outer peripheral surface of the roller 1' Is likely to decline.

On the other hand, in the product of the present invention, the fluidity of the raw material 90 is improved by the presence of the second connecting portion 72, and the raw material 90 is filled up to every corner, and the time required to complete the filling is shortened. Thereby, the variation due to the place of the heat history at the time of curing the raw material 90 is reduced, and the outer layer portion 76 of the roller 1A does not undergo large deformation even when it becomes a final molded product. The shape accuracy is enhanced.
And according to the roller 1A which concerns on this embodiment comprised in this way, the outer peripheral surface of the roller 1A can be easily crushed structurally, without being based on material selection, and the area of the contact surface S can be enlarged.

  That is, when the roller 1A is pressed against the medium P and a pressing force F directed to the center of the roller 1A is applied, the connection site Jo of the connection portion Ji with the inner peripheral portion 66 of the first connecting portion 70 and the outer periphery 68 The opposite force (shear) parallel to the pressing direction acts on both parts of and. In this case, since both the first connecting portion 70 and the second connecting portion 72 are elastic bodies, they swing with the connecting portions Ji and Jo between the inner peripheral portion 66 and the outer peripheral portion 68 as a fulcrum and become the extending direction thereof. It can be shrunk in the longitudinal direction as well. Then, the above-described good crushing of the outer peripheral surface of the roller 1A is realized. Furthermore, by reversing the direction of inclination of the adjacent second connection portions 72, the mutual swings cancel each other out, and only the contraction deformation in the longitudinal direction occurs, and the crushing of the outer peripheral surface of the roller 1A is realized in a well-balanced manner. Becomes possible.

◆ ◆ Embodiment 4 ◆ ◆
(1) Configuration of roller (see FIG. 19)
In the roller 1B according to the present embodiment, the roller 1A according to the third embodiment is constituted by the two members of the inner layer portion 74 and the outer layer portion 76, while the outer layer portion 76 of another member is eliminated and the outer layer is formed on the inner layer portion 74. It has the function of the part 76 and is comprised by a single member.
Accordingly, since the other configuration is the same as that of the third embodiment, the same configuration as that of the third embodiment will be briefly described or omitted, and the specific configuration of the roller 1B according to the present embodiment will be mainly described. Explain to.

That is, the roller 1B according to the present embodiment includes the shaft 62 and the elastic body 64 similarly to the roller 1A according to the third embodiment, and the elastic body 64 includes the inner circumferential portion 66, the outer circumferential portion 68, and the first It is comprised by providing the connection part 70 and the 2nd connection part 72. As shown in FIG.
The first connecting portion 70 is inclined in the same direction in the circumferential direction E with respect to the radial direction D of the roller 1B, and the elastic body portion 64 is configured by a single member.

Accordingly, in the roller 1B according to the present embodiment, the plurality of annular groove portions 78 formed in the outer peripheral surface of the outer layer portion 76 in the third embodiment are with respect to the outer peripheral surface of the elastic member 64 of a single member. It is formed.
In addition, as a modified example in which the constituent material of the elastic body portion 64 and the shapes, numbers, angles, and arrangements of the first connecting portion 70 and the second connecting portion 72 are different, those described in Embodiment 3 can be adopted as they are.

(2) Forming and acting of the roller In order to form the roller 1B configured in this way, the raw material 90 heated and softened is pushed into the closed mold, and cooled and solidified to form an injection Molding can be employed as an example. Also in this case, the effect shown in FIG. 10 described in the third embodiment can be obtained, and the outer peripheral surface of the roller 1B is not significantly deformed, and the shape accuracy of the outer peripheral surface of the roller 1B is improved.
Then, also in the present embodiment, as in the third embodiment, the outer peripheral surface of the roller 1B can be easily crushed in a well-balanced manner without depending on the material selection, and the contact area with the medium P can be increased.

◆ ◆ Other embodiments ◆ ◆
The roller 1, the separation device 60, and the image reading device 10 according to the aspect of the present invention are basically based on having the above-mentioned configuration, but a partial configuration without departing from the scope of the present invention It is of course possible to change or omit the above, or to apply to other devices.
FIG. 20 is a side view showing a roller according to another embodiment of the present invention. In the embodiment described above, the first connecting portion 70 is described as having a linear shape in a side view of the roller 1A and being inclined with respect to the radial direction D from the center of the roller 1A. As shown in the above, it is also possible to adopt a structure in which the first connecting portion 70 has a curved shape in a side view of the roller 1 and is inclined with respect to the radial direction D. The other structure is the same as that of the above embodiment, so the description thereof is omitted.
By forming the first connecting portion 70 in the curved shape, the crushing of the roller 1 when the pressing force F is applied to the roller 1 can be realized in a more balanced manner.
In addition, although the structure which does not have the outer layer part 76 is shown here, the roller 1 is not limited to this structure, of course, the structure provided with the outer layer part 76 may be sufficient.

FIG. 21 is a longitudinal cross-sectional view showing a roller according to still another embodiment of the present invention. Here, although the structure which does not have the outer layer part 76 is shown, the roller 1 is not limited to this structure, of course, the structure provided with the outer layer part 76 may be sufficient. In the embodiment described above, the second connecting portion 72 is described as having a linear shape in a longitudinal cross-sectional view and being inclined with respect to the surface, but as shown in FIG. It is also possible to adopt a structure in which the longitudinal cross-sectional view 72 has a curved shape and is inclined with respect to the surface. The other structure is the same as that of the above embodiment, so the description thereof is omitted.
By forming the second connecting portion 70 into the curved shape, the crushing of the roller 1 when the pressing force F is applied to the roller 1 can be realized in a more balanced manner.
In addition, although the structure which does not have the outer layer part 76 is shown here, the roller 1 is not limited to this structure, of course, the structure provided with the outer layer part 76 may be sufficient.

  Further, the roller 1 according to the aspect of the present invention described above and the separation device 60 in which the roller 1 is applied to the retard roller 36 can be applied to a recording device for performing recording on the medium P. That is, the recording apparatus according to the aspect of the present invention includes an ink jet printer including a recording unit such as a recording head, and a roller provided on the medium conveyance path 26 passing through the recording execution area of the recording unit to apply the feeding force to the medium P. And the like, wherein the roller has a structure in which the contact surface S elastically collapses when pressed against the medium P, and at least one of the rollers, for example, the retard roller 36 according to the present invention. It is possible to comprise by the roller 1 of an aspect.

  In addition, the thicknesses of the inner circumferential portion 66 and the outer circumferential portion 68 can be appropriately adjusted within a range where the required rigidity and elasticity can be obtained. Besides, in the shape of the side view of the first connecting portion 70 and the longitudinal sectional view of the second connecting portion 72, various shapes in which the pressing directions described above are parallel and the opposite force (shear) can be obtained can be adopted. In addition to the shape described in the embodiment, it may be a shape bent in one or more steps or a multi-branched shape.

1 ... roller, 10 ... image reading device, 12 ... lower unit,
14: upper unit, 16: cover portion, 16a: medium mounting portion,
18 ... discharge tray, 20 ... feeding port, 22 ... edge guide, 24 ... discharge port,
26: Medium conveyance path 28: Mounting portion detection sensor 30: Control portion
34 ... feeding roller, 36 ... retard roller, 40 ... torque limiter,
42: first medium detection sensor 42a: light emitting unit 42b: light receiving unit
44: Double feed detection sensor 44a: Speaker unit 44b: Microphone unit
46: Transport roller pair 46a: Transport drive roller 46b: Transport driven roller,
48: Second medium detection sensor 52: Reading unit
52A: first reading unit 52B: second reading unit
54 ... discharge roller pair, 54a ... discharge drive roller, 54b ... discharge driven roller,
60: separation device, 62: shaft, 64: elastic body portion, 66: inner circumferential portion,
68: outer peripheral portion 70: first connecting portion 72: second connecting portion 74: inner layer portion
76 outer layer portion 78 groove portion 80 space portion 82 one side concave portion
84 ... other side recess, 86 ... second space, 88 ... through hole, 90 ... raw material,
92: Chamfering, 94: fine unevenness, 96: adhesive, 98: groove,
G: bundle of media, P: media, A: media conveyance direction, X: device width direction (axial direction),
X1 ... one, X2 ... other, B ... rotation direction, C ... reverse direction, R ... return direction,
S: contact surface, D: radial direction, E: circumferential direction, F: pressing force, Ji: connection portion,
Jo ... connection part, θ ... inclination angle

Claims (12)

A roller comprising: a shaft; and an elastic body portion provided on an outer peripheral surface of the shaft,
The elastic body portion is
An inner circumferential portion on the shaft side;
An outer circumferential portion that is an outer circumferential side with respect to the inner circumferential portion;
A plurality of first connecting portions connecting the inner peripheral portion and the outer peripheral portion;
And a plurality of second connection portions provided in a space portion between the adjacent first connection portions and dividing the space portion into one side and the other side in the axial direction of the roller,
The roller according to claim 1, wherein the first joining portion is inclined in the same circumferential direction with respect to the radial direction of the roller. In the roller according to claim 1,
The second connecting portion is
Inclined with respect to the plane perpendicular to the axis of the roller,
The roller characterized in that the direction of the inclination of the 2nd connection part which adjoins via the said 1st connection part is reverse. In the roller according to claim 2,
The roller characterized in that the one side recessed part made on one side in the axial direction of the roller bordering on the second connecting part and the other side recessed part made on the other side have a plane symmetrical structure. The roller according to any one of claims 1 to 3
A roller characterized in that a constituent material of the elastic body portion is a non-foam material. The roller according to any one of claims 1 to 4
The elastic body portion is
An inner layer portion on the shaft side;
An outer layer portion to be in contact with the medium;
A roller characterized in that the inner layer portion comprises the first connecting portion, the second connecting portion, the inner peripheral portion, and the outer peripheral portion. The roller according to any one of claims 1 to 5,
The roller according to claim 1, wherein the inclination angle of the first connecting portion is 30 ° or more with respect to the radial direction of the roller. The roller according to any one of claims 1 to 6,
The roller according to claim 1, wherein the inclination angle of the second connecting portion is 60 ° or less with respect to the axial direction of the roller. The roller according to any one of claims 1 to 7
The roller characterized in that the number of one-side concave portions formed on one side in the axial direction of the roller and the other-side concave portions formed on the other side bordering on the second connecting portion is six or more. A separating apparatus comprising: a feeding roller; and a retard roller configured to pair the feeding roller and separate the medium other than the medium to be conveyed from the bundle of the medium and return it upstream.
A separating device characterized in that the retard roller is a roller as claimed in any one of claims 1-8. In the separation device according to claim 9,
When the roller receives a pressing force from the medium, the direction of the inclination of the first connecting portion with respect to the direction of swinging with the connecting portion of the first connecting portion to the inner peripheral portion as the fulcrum is the medium The separation device is characterized in that it is attached in such a way as to return it to the upstream side. An image reader comprising: a reading unit for reading image information of a medium; and a roller provided on a medium conveyance path passing through a reading execution area of the reading unit to apply a feeding force to the medium,
The roller has a structure in which the contact surface elastically collapses when pressed against the medium,
An image reading apparatus, wherein at least one of the rollers is a roller described in any one of claims 1 to 8. A recording apparatus comprising: a recording unit; and a roller provided on a medium conveyance path passing through a recording execution area of the recording unit to apply a feeding force to the medium,
The roller has a structure in which the contact surface elastically collapses when pressed against the medium,
A recording apparatus, wherein at least one of the rollers is a roller according to any one of claims 1 to 8.

Images