JP4610497B2 - Sheet feeding apparatus and image reading apparatus - Google Patents

Description

  The present invention relates to a sheet feeding apparatus and an image reading apparatus that feed a sheet material using a roller.

  2. Description of the Related Art Conventionally, a sheet feeding device that feeds a sheet material using a roller, or an image reading device including the sheet feeding device is known.

  7 and 8 are perspective views of a conventional image reading apparatus. In the image reading apparatus 100, a sheet-through scanner unit 31 is disposed on a flat bed scanner unit 30. The sheet through scanner unit 31 includes the paper feed tray 1 and is configured to be openable and closable with respect to the flat bed scanner unit 30 as shown in FIG. When the original is read by the sheet through scanner unit 31, the original is set on the paper feed tray 1. On the other hand, when the flatbed scanner unit 30 reads a document, the document is set on a document table glass 18 provided in the flatbed scanner unit 30.

  FIG. 9 is a cross-sectional view of the image reading apparatus 100. FIG. 10 is a perspective view of the sheet feeding unit of the sheet through scanner unit 31. The paper feed unit is configured by a paper feed roller unit 125 attached to the unit holding member 140 (see FIG. 10) and disposed in the cover 6 (see FIG. 9). The cover 6 can be opened and closed around the rotation center 22.

  As shown in FIG. 10, the paper feed roller unit 125 includes a pickup roller 3, a paper feed roller 4, a pickup roller support member 29, a feed roller shaft (hereinafter simply referred to as “shaft”) 19, and a guide member 120 ( 120A, 120B) and the like. In the paper feed roller unit 125, the paper feed roller 4 is supported by the shaft 19. A gear 24 that is driven by a drive source (not shown) is provided on the first side portion 141 of the unit holding member 140. One end of the shaft 19 is coupled so as to rotate integrally with the gear 24, and the other end is rotatably supported by the second side portion 142 of the unit holding member 140.

  The paper feed roller unit 125 can rotate around the shaft 19. During paper feeding, when the shaft 19 is driven via the gear 24 to rotate the paper feeding roller 4, the pickup roller 3 is also rotated by a transmission mechanism (not shown). Further, the pickup roller support member 29 rotates via a torque limiter mechanism (not shown), so that the pickup roller 3 comes into contact with the document 2 (see FIG. 9) loaded on the paper feed tray 1 and the document 2 is picked up. Is done.

  Thereafter, the paper feed roller 4 feeds the original 2, but when two or more fed originals 2 overlap, they are separated by a separation pad 5 pressed against the paper feed roller 4 with a constant pressure. . Due to the recent downsizing of products, the outer diameter of the paper feed roller 4 has been reduced, so that the shaft 19 is approaching the document conveyance path. Therefore, there is a possibility that the leading end of the conveyed document 2 is caught on the shaft 19 and the document 2 is damaged as it is. Therefore, a guide member 120 is provided to guide the document 2 so that the document 2 does not interfere with the shaft 19.

  As shown in FIG. 9, the flatbed scanner unit 30 includes an optical unit 14. The optical unit 14 includes a reading sensor 15, a lens 16, and a light source 17. The document 2 conveyed by the conveyance roller 7 is pressed against the reading glass 11 by the pressure plate 8. The reflected light from the document 2 irradiated by the light source 17 of the optical unit 14 is read by the reading sensor 15 through a mirror and a lens 16 (not shown). Thereafter, the document 2 is discharged by the discharge roller 10 and stacked on the discharge tray 21. When a paper jam occurs, the cover 6 can be opened around the rotation center 22 to remove the document 2 jammed in the conveyance path. When the original 2 is read by the flatbed scanner unit 30, the optical unit 14 moves in the direction of the arrow in the figure, and reads the image of the original 2 set on the original table glass 18.

  Here, the paper feed roller 4 and the pick-up roller 3 for paper conveyance are gradually deteriorated due to wear and dirt, and therefore need to be replaced. In order to replace the roller in the above configuration, it is necessary to remove an exterior cover (not shown), remove the gear 24, remove an E ring (not shown), and the like, and the replacement work is not easy for the user.

By the way, as shown in Patent Document 1 below, a sheet feeding apparatus having a configuration that assumes roller replacement is also known. In this apparatus, what is equivalent to a conventional paper feed roller shaft is divided into a roller support shaft integral with the paper feed roller and a shaft that transmits rotational force to the roller support shaft. Furthermore, both shafts are connected by a slidable shaft joint. Thus, when the paper feed roller is replaced, the paper feed roller can be replaced by sliding the shaft coupling and removing only the roller support shaft and the paper feed roller integral therewith outside the apparatus.
Japanese Patent No. 3311049

  However, if the configuration of the sheet feeding device disclosed in Patent Document 1 is adopted and the paper feed roller unit as shown in FIG. 10 is configured to be detachable, the number of parts increases. That is, a shaft coupling, a stop member for stopping the shaft coupling, a shaft coupling bearing for holding the shaft coupling, and a support member for holding the shaft coupling bearing must be provided, which complicates the configuration. In addition, depending on the arrangement of the support member, there is a possibility that the product becomes large or the paper feed roller becomes difficult to remove.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to configure a feeding unit attaching / detaching mechanism having a guide member for guiding a sheet material with a small number of parts and a feeding unit. It is an object of the present invention to provide a sheet feeding apparatus and an image reading apparatus that can easily exchange the sheet.

  In order to achieve the above object, a sheet feeding apparatus according to claim 1 of the present invention includes a feeding roller for feeding a sheet material, a feeding roller shaft for supporting the feeding roller, and the feeding roller shaft. A sheet feeding unit comprising a feeding unit which is pivotally supported and has a guide member for guiding the fed sheet material so as not to interfere with the feeding roller shaft. A transmission member that is provided in the unit holding portion and that detachably supports the feeding roller shaft while transmitting rotational force to the feeding roller shaft; and the guide that is provided in the unit holding portion. A guide support member that detachably supports the member, and supports the feed roller shaft on the transmission member, and the guide member supports the guide member in a state where the guide member pivotally supports the feed roller shaft. For supporting member Be to lifting, characterized in that the feed unit is configured to be attached to the unit holder.

  In order to achieve the above object, an image reading apparatus according to an eighth aspect of the present invention includes the sheet feeding apparatus according to any one of the first to seventh aspects.

  According to the first aspect of the present invention, the feeding unit attaching / detaching mechanism having the guide member for guiding the sheet material can be configured with a small number of parts, and the feeding unit can be easily replaced.

  According to claim 2, it is possible to facilitate the mounting operation of the feeding unit.

  According to the third aspect, the mounting operation of the feeding unit can be facilitated.

  According to the fourth aspect, it is possible to prevent the guide member from dropping off from the guide support member in the mounted state of the feeding unit.

  According to the fifth aspect, it is possible to prevent the feeding unit from being unexpectedly detached from the unit holding part during use or the like without making it difficult to attach or detach the feeding unit.

  According to the sixth aspect of the present invention, it is possible to provide a lock function with a simple configuration, and to prevent the feeding unit from being unexpectedly detached from the unit holding portion during use or the like.

  According to the seventh aspect, it is possible to prevent the feeding roller shaft from coming off from the transmission member in the mounted state without making it difficult to attach and detach the feeding unit.

  According to the eighth aspect of the present invention, the feeding unit attaching / detaching mechanism having the guide member for guiding the sheet material can be configured with a small number of parts, and the feeding unit can be easily replaced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a perspective view of a sheet feeding unit of a sheet feeding apparatus according to a first embodiment of the present invention. The image reading apparatus 100 to which the sheet feeding apparatus of the present embodiment is applied is different from the conventional image reading apparatus described with reference to FIGS. The structure of the attachment / detachment mechanism for the unit holding member of the paper roller unit is different. Accordingly, instead of the paper feed roller unit 125 and the unit holding member 140, a paper feed roller unit (feed unit) 25 and a unit holding member (unit holding unit) 40 are employed. Other configurations are the same as those of the conventional image reading apparatus, and perspective views are as shown in FIGS.

  Further, the cross-sectional view is as shown in FIG. 9 except that a paper feed roller unit 25 is provided instead of the paper feed roller unit 125. The “sheet feeding device” corresponds to the sheet-through scanner unit 31 (see FIGS. 7 and 8). The sheet feeding unit of the sheet through scanner unit 31 will be described with reference to FIG. 1 instead of FIG. 1 to 5, the same components as those of the conventional image reading apparatus are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 1 shows a state before the paper feed roller unit 25 is mounted on the unit holding member 40. As shown in the figure, the paper feed roller unit 25 is provided with a pickup roller 3, a paper feed roller (feed roller) 4, a pickup roller support member 29, a shaft 19, a guide member 20, and a guide member 27. . The paper feed roller 4 is supported by the shaft 19.

  The guide member 20 and the pickup roller support member 29 are provided on the shaft 19. The guide member 20 and the pickup roller support member 29 are connected to each other by an engaging portion (not shown) so as to rotate together. The guide member 20 corresponds to the guide member 120 </ b> A (see FIG. 10) and is disposed on the attachment portion 19 a side which is one end portion of the shaft 19. The guide member 27 corresponds to the guide member 120 </ b> B (see FIG. 10), and is provided to be rotatable with respect to the shaft 19 on the other end 19 b side of the shaft 19. The guide member 27 guides the document 2 together with the guide member 20 so that the leading end of the conveyed document 2 is not caught by the shaft 19. A pin 34 is press-fitted into the mounting portion 19 a of the shaft 19 in a direction (vertical direction) perpendicular to the shaft 19.

  A gear 28 as a “transmission member” corresponding to the gear 24 (see FIG. 10) is provided on the first side portion 41 of the unit holding member 40. The gear 28 is provided with a support portion 28a, and the support portion 28a protrudes inside the first side portion 41 (on the second side portion 42 side). The gear 28 is rotationally driven by a drive source (not shown). Further, a support member 26 as a “guide support member” for supporting the guide member 27 is integrally formed or fixed separately from the inside of the second side portion 42 (on the first side portion 41 side). Yes.

  FIG. 2 is a cross-sectional view of a portion where the gear 28 and the shaft 19 are connected. An insertion hole 28aa into which the attachment portion 19a of the shaft 19 can be inserted and removed is formed in the support portion 28a of the gear 28 along the longitudinal direction of the unit holding member 40 (left and right direction in FIG. 2). Further, the support portion 28a is notched in a slit shape in the vertical direction, and thereby, a pin receiving portion 28ab for engaging with the pin 34 is formed.

  When the mounting portion 19a of the shaft 19 is inserted into the support portion 28a of the gear 28 in the direction of the arrow shown in the figure while aligning the positions of the pin 34 and the pin receiving portion 28ab, the pin 34 is engaged with the pin receiving portion 28ab. To do. As a result, the mounting portion 19a, which is one end portion of the shaft 19, is supported by the gear 28, and the rotational driving force of the gear 28 is transmitted to the shaft 19 via the pin 34 and the pin receiving portion 28ab.

  3A to 3C are perspective views of a portion where the guide member 27 and the support member 26 are connected. 2A shows a state before the guide member 27 is attached to the support member 26, FIG. 2B shows a temporarily attached state, and FIG. 2C shows an attached state.

  As shown in FIGS. 1 and 3A, an extended portion 27 b extending in a direction perpendicular to the shaft 19 is integrally formed on the end portion of the guide member 27 on the side not facing the pickup roller support member 29. Formed or fixed separately. A mounting portion 27a as an “engaging portion” is formed to project from the axial center position of the shaft 19 outside the extending portion 27b (on the opposite side of the pickup roller support member 29). As shown in FIG. 3A, the attachment portion 27a is formed in a cylindrical shape having a hole into which the other end portion 19b of the shaft 19 is inserted and fitted. The mounting portion 27a is formed with two cutout portions 27aa (D cuts provided at two locations) parallel to the longitudinal direction of the extending portion 27b and parallel to the axis of the shaft 19. That is, the attachment portion 27 a has a shape formed by cutting out two portions from the circular outer shape when viewed from the axial direction of the shaft 19.

  On the other hand, the support member 26 is formed with a hole 26a as an “engagement corresponding portion” that engages with the attachment portion 27a. The hole 26a has a shape in which a part of a circular hole is notched as viewed from the axial direction of the shaft 19, and the notched opening 26b that has been notched widens as the distance from the hole 26a increases. A guide surface 26c is connected and formed. The portion corresponding to the inner diameter of the hole 26a has a fitting size with the portion corresponding to the outer diameter of the mounting portion 27a. Moreover, the space | interval (width | variety) of the notch opening part 26b is slightly larger than the dimension between the two notch parts 27aa of the attachment part 27a, and is smaller than the outer diameter of the circular arc part of the attachment part 27a.

  Therefore, as shown in FIG. 3A, if the two notches 27aa are made parallel to both opposing surfaces constituting the notch opening 26b, the mounting portion 27a passes between the notch openings 26b. Although it is possible, if it is not parallel but close to orthogonal, the passage is blocked. The guide surface 26c functions to guide the attachment portion 27a between the cutout openings 26b, and enables smooth engagement between the attachment portion 27a and the hole 26a. The attachment portion 27a is rotatable with respect to the hole 26a when fitted in the hole 26a.

  In this configuration, the paper feed roller unit 25 is attached to the unit holding member 40 as follows.

  FIG. 4 is a perspective view of the paper feeding unit showing a state where the paper feeding roller unit 25 is being attached to the unit holding member 40. FIG. 5 is a perspective view of the paper feed unit showing a temporarily mounted state (a state where it is temporarily supported) of the paper feed roller unit 25 to the unit holding member 40. 4 and 5 correspond to FIGS. 3 (a) and 3 (b).

  First, the guide member 27 is attached to the shaft 19 in advance. As shown in FIGS. 2 and 4, the mounting portion 19 a of the shaft 19 is moved in a direction substantially along the center of the shaft 19 and is inserted into the support portion 28 a of the gear 28. At that time, even if the shaft 19 is inclined as shown in FIG. 4, the mounting portion 19a can be inserted into the support portion 28a. This can be realized by the dimensional relationship between the mounting portion 19a and the insertion hole 28aa, or by the floating support of the gear 28 with respect to the first side portion 141.

  Next, as shown in FIGS. 3A and 4, the rotation position of the guide member 27 with respect to the shaft 19 is set so that the extending portion 27 b of the guide member 27 faces in the opposite direction (upward) of the support member 26. Rotation position. At this time, the two cutout portions 27aa of the attachment portion 27a are parallel to both opposing surfaces constituting the cutout opening portion 26b of the support member 26. With this posture, the guide member 27 is moved in the direction of the arrow shown in FIGS. Then, the attachment portion 27a passes between the notched openings 26b, and the attachment portion 27a is engaged with the hole 26a (see FIGS. 3B and 5).

  Next, the guide member 27 is rotated about 90 ° with respect to the support member 26 in the direction of the arrow shown in FIG. 5 (clockwise as viewed from the other end 19b side of the shaft 19). Since the guide member 27 is rotatable with respect to the shaft 19, only the guide member 27 eventually rotates alone. Then, as shown in FIG. 3C, one of the cutout portions 27aa of the attachment portion 27a faces the direction of the guide surface 26c (upward), and is substantially orthogonal to the facing surface forming the cutout opening portion 26b. Accordingly, the cutout portion 27aa, the hole 26a, and the cutout opening portion 26b serve as a “lock mechanism”, and the attachment portion 27a is in a “locked state” where it cannot be removed from the hole 26a. In addition, since the position of the guide member 27 in the rotational direction has changed, the guide portion 27 c, which is the portion of the guide member 27 that performs the guide function of the document 2, comes to a position where the document 2 can be guided.

  In this manner, the mounting of the paper feed roller unit 25 to the unit holding member 40 is completed. In a state where the guide member 27 is in a posture capable of guiding the document 2, the mounting portion 27 a supports the shaft 19 while being supported by the support member 26, so that the posture of the guide member 27 is maintained even when the shaft 19 rotates. Will not change. Further, the center of rotation of the shaft 19 is automatically and accurately positioned simultaneously with the mounting of the paper feed roller unit 25 by the shaft support by the guide member 27 of the shaft 19 and the shaft support by the hole 26a of the mounting portion 27a.

  On the other hand, the paper feed roller unit 25 is removed by a process opposite to the mounting. That is, after the guide member 27 is rotated to the rotation position shown in FIG. 3B, the attachment portion 27a is removed from the hole 26a. Thereafter, the mounting portion 19a of the shaft 19 is removed from the insertion hole 28aa (see FIG. 2) of the gear 28.

  According to the present embodiment, the mounting portion 19 a of the shaft 19 is supported by the support portion 28 a of the gear 28, and the guide member 27 that rotatably supports the shaft 19 is supported by the hole 26 a of the support member 26. The paper feed roller unit 25 is attached to the unit holding member 40. That is, when the paper feed roller unit 25 is configured to be detachable from the unit holding member 40, the shaft 19 is substantially supported by the support member 26 with the guide member 27, which is an essential part, interposed. It was. In addition, a part of the attachment / detachment mechanism is provided between the guide member 27 and the support member 26. Accordingly, the attachment / detachment mechanism of the paper feed roller unit 25 can be configured with a small number of parts, and the paper feed roller unit 25 or the pickup roller 3 and the paper feed roller 4 can be easily replaced. In particular, since the outer diameter of the sheet feeding roller 4 is small, in the sheet feeding apparatus provided with the guide member 27 that guides the document 2 so as not to be caught by the shaft 19, an increase in the number of parts and a complicated configuration are suppressed as much as possible. However, the replacement work can be facilitated.

  Further, the guide member 27 is positioned at a predetermined rotation position (see FIG. 3C) with the attachment portion 27a engaged with the hole 26a, so that the guide member 27 can feed the document 2 to be fed. The posture is such that it can be guided, and the mounting of the paper feed roller unit 25 is completed. That is, the mounting portion 27a is provided with a cutout portion 27aa, and the engagement / disengagement of the mounting portion 27a with respect to the hole 26a is possible only in a predetermined rotational position. In addition, when the guide member 27 is in a posture capable of guiding the document 2, the attachment portion 27 a is locked so as not to come out of the hole 26 a. Furthermore, since the attachment portion 19a of the shaft 19 is inserted into the support portion 28a of the gear 28 in the axial direction of the shaft 19, the attachment portion 19a comes out of the support portion 28a unless the attachment portion 27a is removed from the hole 26a. There is nothing.

  As a result, the paper feed roller unit 25 is mounted after the mounting portion 19a of the shaft 19 is engaged with the support portion 28a of the gear 28, the engagement of the mounting portion 27a with the hole 26a, and the subsequent guide member 27. It is completed by the work of rotating operation. Therefore, it is easy to mount the paper feed roller unit 25 on the unit holding member 40. Therefore, without making it difficult to attach and detach the paper feed roller unit 25, the mounting portion 27 a is difficult to be removed from the hole 26 a when the image reading apparatus 100 is used, and the paper feed roller unit 25 is separated from the unit holding member 40. It can suppress that it comes off unexpectedly.

  Further, since the notch portion 27aa formed in the attachment portion 27a and the notch opening portion 26b formed in the hole 26a constitute a lock function, the structure of the mechanism for preventing the sheet feeding roller unit 25 from dropping off is simple.

  In addition, although two notch parts 27aa were formed in the attaching part 27a, it is not restricted to this, The number of notch parts 27aa is not limited to two. For example, one cutout portion 27aa may be formed to form a so-called D-cut shape. In that case, what is necessary is just to also set the shape and space | interval of the notch opening part 26b in the hole 26a according to it. Moreover, the attaching part 27a may not be a cylindrical shaft part but may be a columnar shape.

  In addition, although the attaching part 27a was comprised as a shaft part and the hole 26a was comprised as a bearing part, it is good also considering the relationship of both as the reverse. That is, a bearing hole having a notch opening may be provided in the mounting portion 27a, and a notched shaft portion may be provided in the support member 26.

(Second Embodiment)
6A and 6B are partial perspective views of the sheet feeding unit of the sheet feeding apparatus according to the second embodiment of the present invention. 6A and 6B correspond to FIGS. 4 and 5, respectively.

  In the present embodiment, the configuration of the guide member and the configuration of the support member for supporting the guide member in the unit holding member 40 are different from those of the first embodiment. Other configurations are the same as those of the first embodiment.

  In the second embodiment, the guide member 33 is the same as the guide member 27 in the first embodiment in that the guide member 33 is provided rotatably on the shaft 19 on the other end 19b side of the shaft 19. is there. However, the mounting portion 33a is different from the mounting portion 27a. The attachment portion 33a has, for example, a square shape.

  Further, in the present embodiment, the support member 32 provided on the inner side of the second side portion 42 of the unit holding member 40 is different from the support member 26 in the first embodiment in that the attachment portion 33a is fitted. A hook 32 a having elasticity protrudes from the receiving portion of the member 32. A hook-shaped claw portion 32aa facing inward is integrally formed at the tip of the hook 32a.

  In such a configuration, the attachment portion 33a is moved in the direction of the arrow shown in FIG. Then, the attachment portion 33a passes over the claw portion 32aa, and the attachment portion 33a is fitted to the receiving portion of the support member 32 as shown in FIG. At the same time, the upper end of the mounting portion 33a is locked to the claw portion 32aa, and a simple retaining state is obtained. That is, the claw portion 32aa functions as a “lock mechanism”. Further, the guide portion 33c of the guide member 33 corresponding to the guide portion 27c does not change from before the fitting portion 33a is fitted to the support member 32 to after the fitting, and is in a position where the document 2 can be guided after the fitting. It comes to come.

  According to the present embodiment, the guide member 33 is fixed to the support member 32 in a locked state by a simple operation of pushing the attachment portion 33a into the support member 32. At the same time, the guide member 33 is in a posture capable of guiding the document 2, and the guide member 33 is not easily detached from the support member 32. Therefore, it is possible to achieve the same effect as that of the first embodiment with respect to making the attachment / detachment mechanism of the paper feed roller unit 25 with a small number of parts and facilitating the replacement.

  Further, the mounting portion 33 a of the guide member 33 supports the shaft 19 so as to be rotatable while being supported by the support member 32. Therefore, the same effect as that of the first embodiment is obtained in that the rotation center of the shaft 19 is positioned with high accuracy.

  Note that the member that locks the guide member 33 to the support member 32 is not limited to the hook 32a, and an engaging portion having another configuration using an elastic member such as resin or metal may be employed. Further, the relationship between the attachment portion 33a and the support member 32 may be reversed, and a locking portion corresponding to the hook 32a may be provided in the attachment portion 33a.

  Note that the guide roller 27 and 33 are supported in the first and second embodiments as long as the mechanism for attaching and detaching the paper feed roller unit 25 is configured with a small number of parts and is easily replaced. The structure supported by the members 26 and 32 is not limited to the illustrated example. That is, other configurations may be employed as long as the shaft 19 is substantially supported by the support members 26 and 32 with the guide members 27 and 33 that are essential parts interposed therebetween.

  In the first and second embodiments, unless the guide members 27 and 33 are removed from the support members 26 and 32, the mounting portion 19a is not limited to the above configuration in order to prevent the attachment portion 19a from being removed from the support portion 28a. I can't. That is, the moving direction when the guide members 27 and 33 are engaged with the support members 26 and 32 may be a direction orthogonal to the shaft 19 and the configuration for engagement is not limited.

  In the first and second embodiments, the document 2 that is the target of image reading is not limited to paper, but also includes sheet material such as OHP paper.

FIG. 3 is a perspective view of a sheet feeding unit of the sheet feeding apparatus according to the first embodiment of the present invention. It is sectional drawing of the part to which a gear and a shaft are connected. It is a perspective view of the part with which a guide member and a support member are connected (figure (a)-(c)). FIG. 6 is a perspective view of a paper feeding unit showing a state in the middle of mounting the paper feeding roller unit to a unit holding member. FIG. 6 is a perspective view of a paper feeding unit showing a temporary mounting state of a paper feeding roller unit to a unit holding member. FIG. 6 is a partial perspective view of a sheet feeding unit of a sheet feeding apparatus according to a second embodiment of the present invention. It is a perspective view of the conventional image reading apparatus. It is a perspective view of the conventional image reading apparatus. It is sectional drawing of an image reading apparatus. FIG. 4 is a perspective view of a sheet feeding unit of a sheet through scanner unit.

Explanation of symbols

2 Document (sheet material)
3 Pickup roller 4 Feed roller (feed roller)
19 axis (feed roller axis)
19a Mounting part (one end)
19b Other end 25 Paper feed roller unit (feed unit)
26, 32 Support member (guide support member)
26a hole (a part of the lock mechanism, the engagement corresponding part)
26b Notched opening (part of the locking mechanism)
27, 33 Guide member 27a Mounting portion (engaging portion)
27aa Notch (part of locking mechanism)
28 Gear (Transmission member)
31 Sheet-through scanner unit (sheet feeding device)
32a hook (locking mechanism)
40 Unit holding member (unit holding part)
100 Image reading apparatus

Claims (8)

A feeding roller that feeds the sheet material, a feeding roller shaft that supports the feeding roller, and a shaft that supports the feeding roller shaft, and the fed sheet material does not interfere with the feeding roller shaft. A sheet feeding device comprising a feeding unit having a guide member for guiding in such a manner that the feeding unit is detachably attached to the unit holding portion,
A transmission member that is provided in the unit holding portion and that detachably supports the feeding roller shaft while transmitting a rotational force to the feeding roller shaft;
A guide support member that is provided in the unit holding part and removably supports the guide member;
The feeding unit is supported by the transmission member, and the guide member is supported by the guide support member in a state where the guide member pivotally supports the feeding roller shaft. A sheet feeding apparatus configured to be mounted on a holding unit.   The guide support member is configured to rotatably support the guide member, and the guide member is rotatably supported by the guide support member and can guide the sheet material to be fed. The sheet feeding apparatus according to claim 1, wherein the sheet feeding device is configured to complete the mounting of the feeding unit to the unit holding portion.   The guide member is positioned at a predetermined rotation position in a state where the guide member is rotatably supported by the guide support member, so that the guide member has a posture capable of guiding the sheet material to be fed. The sheet feeding apparatus according to claim 2.   The sheet feeding apparatus according to any one of claims 1 to 3, wherein a lock mechanism is provided for locking the guide member in a state of being supported by the guide support member.   The guide member has an engaging portion, the guide support member has an engaging corresponding portion that can be engaged with the engaging portion, and the engaging portion and the engaging corresponding portion are engaged with each other. The guide member is configured to be rotatably supported by the guide support member, and the engagement member and the engagement corresponding portion are engaged with each other, and the sheet member to which the guide member is fed is provided. In the posture capable of guiding, the engagement portion and the engagement corresponding portion cannot be disengaged, while the position in the rotation direction is different from the posture in which the guide member can guide the fed sheet material. The seat according to any one of claims 1 to 3, wherein the seat is configured so that the engagement portion and the engagement corresponding portion can be engaged / released in a predetermined posture. Feeding device.   One of the engagement part and the engagement corresponding part is a shaft part having a shape in which a cross-section is cut out at least partially from a circular outline, and the other of the engagement part and the engagement corresponding part is 6. The sheet feeding apparatus according to claim 5, wherein the cross section is a bearing portion having a shape obtained by cutting out a part of a circular hole.   The feed roller shaft is configured such that one end thereof can be supported by the transmission member, while the other end is pivotally supported by the guide member, and the feed unit is mounted on the unit holding portion. After the one end portion of the feeding roller shaft is moved in the axial direction of the feeding roller shaft and supported by the transmission member, the other end portion of the guide member is moved to the shaft of the feeding roller shaft. The structure according to claim 1, wherein the feeding unit is attached to the unit holding portion by being moved in a direction orthogonal to the direction and supported by the guide support member. The sheet feeding apparatus according to claim 1.   An image reading apparatus comprising the sheet feeding device according to claim 1.

Images