FEEDING DEVICE

Abstract

A feeding device includes a rotation shaft, a feeding roller that includes a through-hole and that is attached to an attachment position of the rotation shaft by moving along the rotation shaft from one end side of the through-hole through the rotation shaft in a case of attachment, and a stop mechanism that stops movement of the feeding roller before the feeding roller moves to the attachment position in a case of being moved along the rotation shaft from the other end side of the through-hole of the feeding roller through the rotation shaft.

Claims

1. A feeding device comprising: a rotation shaft; a feeding roller that includes a through-hole and that is attached to an attachment position of the rotation shaft by moving along the rotation shaft from one end side of the through-hole through the rotation shaft in a case of attachment; and a stop mechanism that stops movement of the feeding roller before the feeding roller moves to the attachment position in a case of being moved along the rotation shaft from the other end side of the through-hole of the feeding roller through the rotation shaft.

2. The feeding device according to claim 1, wherein the feeding roller includes a protrusion portion extending in an axial direction of the rotation shaft, and the rotation shaft has a first groove that accommodates the protrusion portion in a case where the feeding roller is attached to the attachment position of the rotation shaft.

3. The feeding device according to claim 2, wherein the rotation shaft includes a second groove on a rear side of the first groove, and the stop mechanism stops the movement of the feeding roller as the second groove restricts movement of the protrusion portion.

4. The feeding device according to claim 3, wherein the protrusion portion protrudes from an end surface of the feeding roller, which is the other end side of the through-hole, and extends in the axial direction of the rotation shaft.

5. The feeding device according to claim 4, wherein the protrusion portion comes into contact with the rotation shaft in a case of moving along the rotation shaft from the other end side of the through-hole of the feeding roller through the rotation shaft.

6. The feeding device according to claim 3, wherein the second groove is disposed at a position where the movement of the protrusion portion is restricted before the rotation shaft penetrates the through-hole in a case where the feeding roller is moved along the rotation shaft from the other end side of the through-hole of the feeding roller through the rotation shaft.

7. The feeding device according to claim 6, wherein a housing that stores the rotation shaft and the feeding roller is provided with an openable and closable cover, and the cover is not closable in a state where the movement of the protrusion portion is restricted by the second groove.

8. The feeding device according to claim 3, wherein the second groove becomes deeper toward a rear side from an end portion side of the rotation shaft in the axial direction of the rotation shaft.

9. The feeding device according to claim 8, wherein the second groove includes an inclined surface that is continuous from a peripheral surface of the rotation shaft on an end portion side of the second groove in the axial direction and a perpendicular surface that extends in a radial direction of the rotation shaft on the rear side in the axial direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Exemplary embodiment(s) of the present invention will be described in detail based on the following figures, wherein:

[0011] FIG. 1 is a view showing an overall configuration of an image reading apparatus to which the present exemplary embodiment is applied;

[0012] FIG. 2 is a view showing a feeding unit;

[0013] FIG. 3 is a view showing a pickup roll;

[0014] FIG. 4 is a view showing a first rotation shaft;

[0015] FIGS. 5A to 5C are views for describing a stop mechanism, FIG. 5A is a view showing an example of a state where the pickup roll is started to be attached in an opposite direction, FIG. 5B is a view showing an example of a state where the pickup roll is moved to a rear side of the first rotation shaft, and FIG. 5C is a view showing an example of a state where the pickup roll is stopped;

[0016] FIG. 6 is a view showing a modification example of the first rotation shaft; and

[0017] FIGS. 7A to 7C are views for describing a stop mechanism according to the modification example, FIG. 7A is a view showing a state where a protrusion portion is in contact with an outer peripheral surface, FIG. 7B is a view showing a state where the protrusion portion moves along an inclined surface, and FIG. 7C is a view showing a state where the protrusion portion is in contact with a stop surface.

DETAILED DESCRIPTION

[0018] Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0019] FIG. 1 is a view showing an overall configuration of an image reading apparatus 1 to which the present exemplary embodiment is applied.

[0020] The image reading apparatus 1 includes a feeding device 2 that lets out and transports paper sequentially from a paper bundle and an image reading unit 3 that reads an image on the paper.

[0021] The feeding device 2 includes a feeding unit 20, a transport path 50, and an upper cover 6.

[0022] The feeding unit 20 supplies paper one by one from a paper bundle placed on a paper tray to the transport path 50. The feeding unit 20 includes a pickup roll 21, a feed roll 22, and a retard roll 23.

[0023] The pickup roll 21 is a roll member that rotates clockwise in an example shown in FIG. 1. The pickup roll 21 is provided on an upper side of the tray on which paper is disposed. In addition, the pickup roll 21 moves to come into contact with paper positioned at the top of a paper bundle. The paper of the paper bundle is sequentially supplied into the feeding device 2 as the pickup roll 21 rotates.

[0024] The feed roll 22 is a roll member that rotates in a direction (in the example shown in FIG. 1, a clockwise direction) in which paper is sent out to a downstream side in a transport direction. The retard roll 23 is disposed at a position facing the feed roll 22. The retard roll 23 is a roll member that rotates in a direction (the clockwise direction in FIG. 1) in which the paper returns to an upstream side in the transport direction. As will be described later, the feed roll 22 and the retard roll 23 send out the paper one by one to the downstream side in the transport direction.

[0025] The transport path 50 includes a transport roll 51, a register roll 52, a platen roll 53, an outroll 54, and a discharge roll 55 in this order from the upstream side of the transport path 50.

[0026] The transport roll 51 further transports paper transported to the transport path 50 toward the register roll 52. The paper is transported toward the platen roll 53 while registration adjustment is performed by the register roll 52. The platen roll 53 transports the paper during image reading by the image reading unit 3. The outroll 54 further transports the paper read by the image reading unit 3 downstream. Then, the discharge roll 55 further transports the paper on which the image is read and discharges the paper to the outside of the feeding device 2.

[0027] The upper cover 6 is provided above the feeding unit 20 and is opened in a case of replacing a component of the feeding unit 20 or eliminating a paper jam.

[0028] FIG. 2 is a view showing the feeding unit 20.

[0029] The feeding unit 20 includes a first rotation shaft 11, a second rotation shaft 12, and a third rotation shaft 13. In addition, the feeding unit 20 includes a slide type slide cover 70.

[0030] The first rotation shaft 11 includes a coupling concave portion 46 for transmitting a rotational driving force to the pickup roll 21. The pickup roll 21 is attached to the coupling concave portion 46. The first rotation shaft 11 rotates in a rotation direction (the clockwise direction in FIG. 1) in which paper is transported to the downstream side in the transport direction. The rotation of the first rotation shaft 11 is transmitted to the pickup roll 21 via the coupling concave portion 46.

[0031] The second rotation shaft 12 includes a coupling concave portion 47 and a one-way 47a that transmits only a rotational force in one direction to the feed roll 22. The feed roll 22 is attached to the coupling concave portion 47. The second rotation shaft 12 rotates in the rotation direction (the clockwise direction in FIG. 1) in which paper is transported to the downstream side in the transport direction. The rotation of the second rotation shaft 12 is transmitted to the feed roll 22 via the coupling concave portion 47. The one-way 47a transmits only a rotational force in one direction. More specifically, the second rotation shaft 12 transmits a force that rotates in the clockwise direction in FIG. 1.

[0032] In a case where the feed roll 22 receives a force in a counterclockwise direction in FIG. 1, the one-way 47a idles with respect to the feed roll 22. For example, in a case where the paper is clogged between the feed roll 22 and the retard roll 23, the feed roll 22 idles in a case where the paper is pulled out to the upstream side in the transport direction.

[0033] The third rotation shaft 13 includes a coupling concave portion 48 and a torque limiter 48a. The retard roll 23 is attached to the coupling concave portion 48. The third rotation shaft 13 rotates in a rotation direction (the clockwise direction in FIG. 1) in which paper is transported to the upstream side in the transport direction. The rotation of the third rotation shaft 13 is transmitted to the retard roll 23 via the coupling concave portion 48. In a case where the retard roll 23 is rotating in the rotation direction in which paper is transported to the upstream side in the transport direction, the retard roll 23 is caused to be driven in the opposite direction in a case where the torque limiter 48a receives torque greater than a force determined in advance in a direction opposite to the rotation direction.

[0034] In a case where one sheet of paper is nipped between the feed roll 22 and the retard roll 23, the feed roll 22 attempts to transport the paper to the downstream side in the transport direction. On the other hand, the retard roll 23 attempts to transport the paper to the upstream side in the transport direction. However, since the torque limiter 48a is provided at the retard roll 23, the retard roll 23 is driven in a direction in which the paper is transported to the downstream side. Accordingly, one sheet of paper is sent out to the downstream side.

[0035] In a case where two sheets of paper are nipped between the feed roll 22 and the retard roll 23, the feed roll 22 and the retard roll 23 rotate in opposite directions in a direction in which the paper is transported since the feed roll 22 and the retard roll 23 slip between the two sheets of paper. The paper in contact with the feed roll 22 is transported to the downstream side in the transport direction. On the other hand, the paper in contact with the retard roll 23 is pushed back to the upstream side in the transport direction. The paper is sent out one by one to the downstream side in the transport direction by the feed roll 22 and the retard roll 23.

[0036] The slide cover 70 is a cover that is movable in an axial direction of the first rotation shaft 11. In a case where a user replaces the pickup roll 21, the feed roll 22, and the retard roll 23, the pickup roll 21, the feed roll 22, and the retard roll 23 are moved in the axial direction of the first rotation shaft 11 and a direction separated away from the first rotation shaft 11.

[0037] FIG. 3 is a view showing the pickup roll 21.

[0038] In the present exemplary embodiment, the pickup roll 21, the feed roll 22, and the retard roll 23 are examples of a feeding roll. Hereinafter, the present exemplary embodiment will be described using the pickup roll 21.

[0039] The pickup roll 21 includes a core portion 31 and a roll portion 32.

[0040] The core portion 31 is a hollow member including a through-hole 37 into which the first rotation shaft 11 is inserted. A surface constituting the through-hole 37, in other words, a surface of the core portion 31 on an inner side will be referred to as an inner peripheral surface 38. The core portion 31 may be molded with one member or may be molded with a plurality of members. The core portion 31 is integrally molded by injection molding of a resin such as plastic.

[0041] The core portion 31 includes a protruding portion 33, a protrusion portion 34, a finger hook portion 35, and a coupling convex portion 36. A one-dot chain line shown in FIG. 3 is a center line 37a that indicates an imaginary center of the through-hole 37 of the core portion 31. Hereinafter, in the pickup roll 21, a direction parallel to a center line of the through-hole 37 will be referred to as an attachment direction in some cases. In addition, in the pickup roll 21, a protruding portion 33 side will be referred to as the other end side in the attachment direction, and a coupling convex portion 36 side will be referred to as one end side in the attachment direction in some cases.

[0042] The protruding portion 33 protrudes from an end surface of the pickup roll 21, which is the other end side of the through-hole 37, and extends along the attachment direction. Among surfaces constituting the protruding portion 33, an inner surface 33a facing a center line 37a side is continuous from the inner peripheral surface 38 of the through-hole 37.

[0043] The protrusion portion 34 has a shape that is convex toward the center line 37a from the inner surface 33a of the protruding portion 33. The protrusion portion 34 is formed to have a shape that fits to an attachment groove 42 (see FIG. 4 to be described later) of the first rotation shaft 11.

[0044] The finger hook portion 35 is provided continuously to the protruding portion 33 and extends to the other end side from the protrusion portion 34 in the attachment direction.

[0045] The coupling convex portion 36 is fitted to the coupling concave portion 46 (see FIG. 2) and receives rotational power of the first rotation shaft 11.

[0046] The roll portion 32 is an outer peripheral member that is fitted to an outer periphery of the core portion 31 and is, for example, a cylindrical member formed of rubber or the like. The roll portion 32 comes into contact with paper, and the paper is transported by a frictional force generated between the paper and the roll portion 32.

[0047] FIG. 4 is a view showing an end portion of the first rotation shaft 11 in a state where the pickup roll 21 is detached.

[0048] The first rotation shaft 11 includes a tapered portion 41, the attachment groove 42, and a stop groove 43. The attachment groove 42 is an example of a first groove, and the stop groove 43 is an example of a second groove. Hereinafter, in the axial direction of the first rotation shaft 11, a side on which the pickup roll 21 is detached will be referred to as a tip side, and a side opposite to the tip side will be referred to as a rear side in some cases.

[0049] The tapered portion 41 is provided at the end portion of the first rotation shaft 11 and has a tapered shape in which a diameter of the first rotation shaft 11 decreases toward the tip side.

[0050] In the attachment groove 42, a concave portion in which the diameter of the first rotation shaft 11 is decreased is provided over one circumference in a circumferential direction of the rotation shaft. A length L1 of the attachment groove 42 in the axial direction is formed so that the protrusion portion 34 (see FIG. 3) of the pickup roll 21 is fitted thereto.

[0051] In the stop groove 43, a concave portion in which the diameter of the first rotation shaft 11 is decreased is provided over one circumference in the circumferential direction of the rotation shaft. The stop groove 43 is provided on the rear side of the attachment groove 42 in the axial direction. The stop groove 43 is provided on the tip side of the coupling concave portion 46 (see FIG. 2) in the axial direction. The length of the stop groove 43 in the axial direction may be the same as or different from the length of the attachment groove 42 in the axial direction. More specifically, the length of the stop groove 43 in axial direction may be longer than the length of the attachment groove 42 in the axial direction.

Procedure for Replacing Pickup Roll 21

[0052] Next, a procedure for replacing the pickup roll 21 will be described with reference to FIGS. 1 to 4. For example, in a case where the roll portion 32 of the pickup roll 21 is worn out due to abrasion with paper, the user replaces the worn out pickup roll 21 with a new pickup roll 21. First, the user performs work of detaching the pickup roll 21 from the first rotation shaft 11. Next, work of attaching the new pickup roll 21 to the first rotation shaft 11 is performed.

[0053] The user opens the upper cover 6 at an upper portion of the feeding device 2 and further slides the slide cover 70 in order to perform the work of detaching the pickup roll 21.

[0054] Then, the user hooks a finger on the finger hook portion 35 of the pickup roll 21 and moves the finger hook portion 35 in a radial direction of the first rotation shaft 11. Accordingly, the protrusion portion 34 of the pickup roll 21 is released from the attachment groove 42.

[0055] Further, the user moves the pickup roll 21 to the tip side in the axial direction along the first rotation shaft 11 to detach the pickup roll 21.

[0056] Next, the user performs the work of attaching a new pickup roll 21. The user inserts the first rotation shaft 11 into the through-hole 37 from the one end side of the pickup roll 21 in the attachment direction. Then, the user moves the pickup roll 21 to the rear side in the axial direction along the first rotation shaft 11. The user couples the coupling convex portion 36 of the pickup roll 21 and the coupling concave portion 46 provided on the rear side of the first rotation shaft 11. A position where the coupling convex portion 36 and the coupling concave portion 46 are coupled is an attachment position of the pickup roll 21. The pickup roll 21 is disposed at the attachment position, and the user accommodates the protrusion portion 34 of the pickup roll 21 in the attachment groove 42 of the first rotation shaft 11. As the protrusion portion 34 is accommodated in the attachment groove 42, the pickup roll 21 is prevented from moving in the axial direction.

[0057] Finally, the user moves the slide cover 70 to the rear side in the axial direction to close the upper cover 6 and ends the work of replacing the pickup roll 21.

Stop Mechanism

[0058] Next, a stop mechanism in a case where the pickup roll 21 is to be attached in the opposite direction will be described with reference to FIGS. 5A to 5C. Herein, attaching the pickup roll 21 in the opposite direction means passing the first rotation shaft 11 through the through-hole 37 from a side (the other end side) on which the protrusion portion 34 is provided in the attachment direction of the pickup roll 21.

[0059] FIGS. 5A to 5C are views for describing the stop mechanism of the present exemplary embodiment. FIG. 5A is a view showing an example of a state where the pickup roll 21 is started to be attached in the opposite direction. FIG. 5B is a view showing an example of a state where the pickup roll 21 is moved to the rear side of the first rotation shaft 11. FIG. 5C is a view showing an example of a state where the pickup roll 21 is stopped.

[0060] As shown in FIG. 5A, in a state where the first rotation shaft 11 is inserted into the through-hole 37 from the other end side of the through-hole 37 of the pickup roll 21, the area of a portion where the inner peripheral surface 38 of the pickup roll 21 and the first rotation shaft 11 are in contact with each other is small. For this reason, in an initial stage of the insertion, the center line 37a of the through-hole 37 of the pickup roll 21 is likely to be inclined with respect to a center line 11a of the first rotation shaft 11. In a case where the center line 37a is inclined with respect to the first rotation shaft 11, the first rotation shaft 11 is likely to be smoothly inserted into the through-hole 37 without the protrusion portion 34 and the attachment groove 42 interfering with each other.

[0061] FIG. 5B shows a state where the protrusion portion 34 of the pickup roll 21 is in contact with an outer peripheral surface 45 of the first rotation shaft 11. In this state, the area of contact between the inner peripheral surface 38 of the pickup roll 21 and the outer peripheral surface 45 of the first rotation shaft 11 is increased, and the inclination of the pickup roll 21 is suppressed. For this reason, the protruding portion 33 including the inner surface 33a continuous from the inner peripheral surface 38 of the pickup roll 21 is likely to come into contact with the outer peripheral surface 45 of the first rotation shaft 11. In addition, the protrusion portion 34 that is convex from the inner surface 33a of the protruding portion 33 toward a first rotation shaft 11 side is provided and comes into contact with the outer peripheral surface 45 of the first rotation shaft 11. In this state, in a case where the user moves the pickup roll 21 to the rear side of the first rotation shaft 11, the protrusion portion 34 slides while coming into contact with the first rotation shaft 11. That is, in a case where the pickup roll 21 moves along the first rotation shaft 11 through the first rotation shaft 11 from the other end side of the through-hole 37 of the pickup roll 21, the protrusion portion 34 is in contact with the outer peripheral surface 45 of the first rotation shaft 11.

[0062] In FIG. 5C, in a case where the pickup roll 21 is further slid rearward from the state of FIG. 5B and the protrusion portion 34 is moved to the position of the stop groove 43, the protrusion portion 34 pressed against the outer peripheral surface 45 falls into the stop groove 43, and the protrusion portion 34 is hooked to the stop groove 43. As the protrusion portion 34 is hooked to the stop groove 43, movement of the pickup roll 21 in the axial direction of the first rotation shaft 11 is restricted. The stop groove 43 and the protrusion portion 34 are examples of the stop mechanism.

[0063] In the present exemplary embodiment, since a length from the end portion of the first rotation shaft 11 to the rear side of the stop groove 43 is shorter than the length of the through-hole 37 of the pickup roll 21, the end portion of the first rotation shaft 11 is stopped before penetrating the through-hole 37.

[0064] In addition, the stop groove 43 of the present exemplary embodiment is provided on an end portion side of the coupling concave portion 46, and the movement of the pickup roll 21 is stopped before the pickup roll 21 is moved to the attachment position in the axial direction of the first rotation shaft 11.

[0065] The user easily recognizes that the pickup roll 21 is attached with an incorrect direction as the pickup roll 21 is stopped in a state where there is a distance to the coupling concave portion 46.

[0066] In addition, since the pickup roll 21 is stopped without penetrating the first rotation shaft 11, the pickup roll 21 is stopped in a state of projecting from a tip portion of the first rotation shaft 11. Accordingly, the slide cover 70 (see FIG. 2) cannot be closed. For this reason, in a case where the user attempts to close the slide cover 70, the user can easily detect that an attachment direction of the pickup roll 21 is not correct.

[0067] FIG. 6 is a view showing a fourth rotation shaft 14 which is a modification example of the first rotation shaft 11.

[0068] In the fourth rotation shaft 14 of the modification example, an inclined groove 49 having a shape different from the stop groove 43, compared to the first rotation shaft 11, is provided. The inclined groove 49 is an example of the second groove, and the inclined groove 49 and the protrusion portion 34 are examples of the stop mechanism. In this modification example, the same reference symbols are used for the same functions as the functions of the first rotation shaft 11, and detailed description thereof will be omitted herein.

[0069] FIG. 6 shows a center of the fourth rotation shaft 14 which is an imaginary center line 14a with a one-dot chain line. The inclined groove 49 of the modification example shown in FIG. 6 includes an inclined surface 49a and a stop surface 49b. The inclined surface 49a is an inclined surface continuous from a peripheral surface of the fourth rotation shaft 14. Toward a rear side in an axial direction of the fourth rotation shaft 14, a diameter of the rotation shaft decreases, and the inclined surface 49a becomes deeper. The inclined surface 49a is a surface inclined with respect to the center line 14a. The stop surface 49b is a surface provided on the rear side of the inclined groove 49 in the axial direction and is a surface extending in a radial direction of the rotation shaft.

[0070] FIGS. 7A to 7C are views showing a stop mechanism according to the modification example. FIG. 7A shows a state where the protrusion portion 34 is in contact with the outer peripheral surface 45. FIG. 7B shows a state where the protrusion portion 34 moves along the inclined surface 49a. FIG. 7C shows a state where the protrusion portion 34 is in contact with the stop surface 49b.

[0071] As shown in FIG. 7B, the protrusion portion 34 gradually sinks toward a center line 14a side of the outer peripheral surface 45 along the inclined surface 49a.

[0072] As shown in FIG. 7C, further movement of the protrusion portion 34 to the rear side as the protrusion portion 34 comes into contact with the stop surface 49b is suppressed. Accordingly, for example, even in a case where the user quickly moves the pickup roll 21, the protrusion portion 34 is likely to be hooked to the stop surface 49b.

[0073] In addition, there is no step between an end portion side of the inclined surface 49a and the outer peripheral surface 45. Accordingly, in a case where the pickup roll 21 is moved to the end portion side in the axial direction, the protrusion portion 34 and the inclined surface 49a do not get hooked to each other, and the pickup roll 21 can be easily removed. Since the pickup roll 21 can be easily removed in a case of moving the pickup roll 21 in a direction of detachment, the user easily recognizes that the pickup roll 21 is attached in an incorrect direction.

[0074] In addition, although paper on which reading is performed is transported in the image reading apparatus 1 is used as an example in the present exemplary embodiment, a feeding device that transports paper on which printing is performed can be applied to, for example, an image forming apparatus.

[0075] The pickup roll 21, the feed roll 22, and the retard roll 23 are described as having the same shape in the present exemplary embodiment, but the shapes and materials of the pickup roll 21, the feed roll 22, and the retard roll 23 may be different from each other according to each function.

Supplementary Notes

(((1))) [0076] A feeding device comprising: [0077] a rotation shaft; [0078] a feeding roller that includes a through-hole and that is attached to an attachment position of the rotation shaft by moving along the rotation shaft from one end side of the through-hole through the rotation shaft in a case of attachment; and [0079] a stop mechanism that stops movement of the feeding roller before the feeding roller moves to the attachment position in a case of being moved along the rotation shaft from the other end side of the through-hole of the feeding roller through the rotation shaft.
(((2))) [0080] The feeding device according to (((1))), [0081] wherein the feeding roller includes a protrusion portion extending in an axial direction of the rotation shaft, and [0082] the rotation shaft has a first groove that accommodates the protrusion portion in a case where the feeding roller is attached to the attachment position of the rotation shaft.
(((3))) [0083] The feeding device according to (((2))), [0084] wherein the rotation shaft includes a second groove on a rear side of the first groove, and [0085] the stop mechanism stops the movement of the feeding roller as the second groove restricts movement of the protrusion portion.
(((4))) [0086] The feeding device according to (((2))) or (((3))), [0087] wherein the protrusion portion protrudes from an end surface of the feeding roller, which is the other end side of the through-hole, and extends in the axial direction of the rotation shaft.
(((5))) [0088] The feeding device according to any one of (((2))) to (((4))), [0089] wherein the protrusion portion comes into contact with the rotation shaft in a case of moving along the rotation shaft from the other end side of the through-hole of the feeding roller through the rotation shaft.
(((6))) [0090] The feeding device according to (((3))), [0091] wherein the second groove is disposed at a position where the movement of the protrusion portion is restricted before the rotation shaft penetrates the through-hole in a case where the feeding roller is moved along the rotation shaft from the other end side of the through-hole of the feeding roller through the rotation shaft.
(((7))) [0092] The feeding device according to any one of (((3))) to (((6))), [0093] wherein a housing that stores the rotation shaft and the feeding roller is provided with an openable and closable cover, and [0094] the cover is not closable in a state where the movement of the protrusion portion is restricted by the second groove.
(((8))) [0095] The feeding device according to any one of (((3))) to (((7))), [0096] wherein the second groove becomes deeper toward a rear side from an end portion side of the rotation shaft in the axial direction of the rotation shaft.
(((9))) [0097] The feeding device according to (((8))), [0098] wherein the second groove includes an inclined surface that is continuous from a peripheral surface of the rotation shaft on an end portion side of the second groove in the axial direction and a perpendicular surface that extends in a radial direction of the rotation shaft on the rear side in the axial direction.

[0099] The foregoing description of the exemplary embodiments of the present invention has been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations will be apparent to practitioners skilled in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, thereby enabling others skilled in the art to understand the invention for various embodiments and with the various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the following claims and their equivalents.