JP2013077040A - Image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus configured such that a second engagement member that restricts the opening of a second upper housing being opened or closed.SOLUTION: The image forming apparatus comprises: a second upper housing 720 arranged on a first upper housing so as to be freely opened or closed; and an opening restriction mechanism 500 that restricts the opening of the second upper housing 720 from the first upper housing while the first upper housing is open with respect to a body side housing. The opening restriction mechanism 500 has a first engagement member provided on the first upper housing, and a second engagement member 520 provided on the second upper housing 720. The opening of the second upper housing 720 is restricted by the engagement of the first engagement member and the second engagement member 520. The second engagement member 520 is energized so as to project toward the first upper housing side and is movable toward the second upper housing 720. The second engagement member 520 includes: a shaft side portion 523 including a rotation shaft; and an engagement side portion 524 having an engagement part that engages with the first engagement member. The engagement side portion 524 is freely rotated with respect to the shaft side portion 523.

Description

  The present invention relates to an image forming apparatus that forms an image on a sheet such as paper.

  As an image forming apparatus such as a copying machine, a main body side housing having an image forming unit that forms an image on a sheet based on image information, an image reading unit that reads an image of a document and obtains image information, and the main body side An image comprising: an upper casing disposed on an upper portion of the casing so as to be freely opened and closed; and a document conveying section disposed on an upper portion of the upper casing and having a reading section cover member that covers the image reading section in a closed state. Forming devices are known.

Such an image forming apparatus includes an opening restriction mechanism that restricts the document conveying unit from opening with respect to the upper casing when the upper casing is opened with respect to the main body casing. According to the opening restriction mechanism, it is possible to prevent a phenomenon in which the document conveying unit is opened with respect to the upper housing in a state where the upper housing is opened with respect to the main body housing.
The opening restriction mechanism includes a first engagement member provided in the upper housing, a second engagement member that protrudes toward the upper housing and is provided in the reading unit cover member and engageable with the first engagement member, Have The opening restriction mechanism restricts the reading unit cover member from opening with respect to the upper housing by engaging the first engagement member and the second engagement member (for example, Patent Documents 1 and 2). reference).

JP 2001-242563 A JP 2009-038787 A

In the image forming apparatus described in Patent Literature 1, when the reading unit cover member is to be opened and closed in a state where the upper housing is closed with respect to the main body housing, the second engaging member protrudes toward the upper housing. If so, the protruding second engaging member may come into contact with the user's hand or the like, and the user may be injured.
In the image forming apparatus described in Patent Document 2, since the second engagement member protrudes toward the upper housing, the reading unit cover member is opened and closed when the upper housing is closed with respect to the main body housing. When trying to do so, the second engaging member may come into contact with the user's hand and the user may be injured.

  According to the present invention, when the reading unit cover member is opened and closed, the second engagement member provided on the reading unit cover member and for restricting the reading unit cover member from opening with respect to the upper housing contacts the user's hand or the like. An object of the present invention is to provide an image forming apparatus that can reduce the risk of injury to the user.

  The present invention includes a main body side housing having an image forming unit that forms an image on a sheet based on image information, an image reading unit that reads an image of a document to obtain image information, and an upper portion of the main body side housing An upper housing that can be freely opened and closed, a reading portion cover member that can be freely opened and closed above the upper housing and covers the image reading portion in the closed state, and the upper housing is the body-side housing An opening restricting mechanism for restricting the reading unit cover member from opening with respect to the upper housing in an open state with respect to the upper housing, wherein the opening restricting mechanism is provided on the upper housing. A first engagement member provided; and a second engagement member provided on the reading unit cover member so as to protrude toward the upper housing and engageable with the first engagement member; The first engagement member and the second engagement member are engaged. Accordingly, the reading unit cover member is restricted from opening with respect to the upper housing, and the second engagement member is biased so as to protrude from the reading unit cover member toward the upper housing side. And an image forming apparatus configured to be movable from the upper housing toward the reading unit cover member.

  Moreover, it is preferable that the second engaging member moves by rotating.

  Further, it is preferable that the opening / closing axis of the reading unit cover member and the opening / closing axis of the upper housing are parallel to each other.

  The opening / closing direction of the reading unit cover member and the opening / closing direction of the upper housing are preferably the same.

  Further, it is preferable that the reading unit cover member constitutes a part of a document conveying unit that conveys a document to an image reading position in the image reading unit.

  The second engagement member includes a shaft-side portion including a rotation shaft thereof, and an engagement-side portion having an engagement portion that engages with the first engagement member, and the engagement-side portion. Is preferably configured to be rotatable with respect to the shaft side portion.

  Further, the second engagement member is attached to an engagement side portion having an engagement portion that engages with the first engagement member, and the engagement side portion toward the distal end side of the engagement side portion. A pair of first extending portions extending from the engaging side portion, a pair of second extending portions extending from each of the pair of first extending portions, and the pair of paired first extending portions. A second extending portion that is provided corresponding to each of the second extending portions and that receives the pair of second extending portions and restricts the movement of the pair of second extending portions by the urging force of the urging member. A movement restricting portion, and when the engagement side portion is pressed, movement of the engagement side portion toward the proximal end portion or one or the other of the pair of second extending portions is performed. It is preferable to be configured to perform rotation with a fulcrum.

  According to the present invention, when the reading unit cover member is opened and closed, the second engagement member provided on the reading unit cover member and for restricting the reading unit cover member from opening with respect to the upper housing is a user's hand or the like. It is possible to provide an image forming apparatus that can reduce the risk of injury to the user by touching the screen.

1 is an external perspective view of a copying machine 1 according to a first embodiment of an image forming apparatus of the present invention. FIG. 2 is a perspective view of the copier 1 shown in FIG. 1 with an upper housing 106 opened with respect to a main body housing 104. FIG. 2 is a right side view of the copier 1 shown in FIG. 1 in a state in which a document conveying unit 107 is opened with respect to the upper housing 106 in a state where the upper housing 106 is closed with respect to the main body housing 104. FIG. 2 is a right side view of the copier 1 shown in FIG. 1 in a state where the upper housing 106 is opened with respect to the main body side housing 104 and the document conveying unit 107 is opened with respect to the upper housing 106. FIG. 2 is a left side view for explaining the arrangement of components in a main body side housing 104 of the copier 1 shown in FIG. 1. 3 is a schematic cross-sectional view of a document conveying unit 107. FIG. FIG. 6 is a perspective view showing a state in which a document conveying unit 107 is opened with respect to the upper housing 106. It is an enlarged view of the vicinity of the 2nd engagement member 520 in FIG. FIG. 6 is a perspective view showing the vicinity of a second engagement member 520 in a state where a document conveying unit 107 is closed with respect to an upper housing 106. FIG. 10 is a perspective view showing the vicinity of the second engagement member 520 in a state where the second engagement member 520 is pushed upward. FIG. 4 is a schematic diagram showing an engagement operation between the second engagement member 520 and the first engagement member 510, where (A) shows a state of engagement, and (B) shows a state of disengagement. is there. FIG. 6 is an enlarged right side view showing a configuration of a second engagement member 520 in the copier 1 according to the second embodiment, where (A) is a diagram showing a natural state and (B) is a diagram showing a state of being pressed upward. is there. 4A and 4B are diagrams illustrating a configuration of a second engagement member 520 in a copying machine 1 according to a third embodiment, where FIG. 5A is an enlarged perspective view and FIG. 5B is an enlarged right side view. FIG. 14A is a right side view showing an operation when the second engagement member 520 shown in FIG. 13 is pressed upward, and FIG. 13A is a diagram showing an operation state when a force is applied from directly below, and FIG. The figure which shows the operation state when force acts from the lower left, (C) is a figure which shows the operation state when force acts from diagonally lower right.

Hereinafter, a copying machine 1 according to a first embodiment of the image forming apparatus of the present invention will be described with reference to the drawings. First, the overall configuration of the copy machine 1 will be described.
FIG. 1 is an external perspective view of a copying machine 1 according to a first embodiment of an image forming apparatus of the present invention. FIG. 2 is a perspective view of the copying machine 1 shown in FIG. 1 with the upper housing 106 opened with respect to the main body housing 104. FIG. 3 is a right side view of the copying machine 1 shown in FIG. is there. FIG. 4 is a right side view of the copying machine 1 shown in FIG. FIG. 5 is a left side view for explaining the arrangement of the components in the main body side housing 104 of the copier 1 shown in FIG. FIG. 6 is a schematic cross-sectional view of the document conveying unit 107. FIG. 7 is a perspective view illustrating a state in which the document conveying unit 107 is opened with respect to the upper housing 106.

  As shown in FIGS. 1 to 4, the copier 1 includes a main body side housing 104 and a document image reading unit 105. The document image reading unit 105 includes an upper casing 106 as a first upper casing and a document conveying section 107.

  As shown in FIG. 5, the main body side housing 104 includes an image forming unit GK (described later) that forms an image on a paper T (sheet) based on image information. As shown in FIGS. 1 to 4, a main body upper cover 104 a is disposed on the upper part of the main body side housing 104 so as to be openable and closable. When the main body upper cover 104a is opened, it is possible to replace a toner cartridge 5 (described later) disposed inside the main body side housing 104, maintain the image forming unit GK, and the like.

  As shown in FIGS. 1 and 2, the document image reading unit 105 is disposed at the upper part of the main body side housing 104 so as to be openable and closable with respect to the main body side housing 104. The document image reading unit 105 includes an upper casing 106 and a document transport unit 107.

  The upper housing 106 is disposed on the upper portion of the main body housing 104 so as to be opened and closed. The upper housing 106 has an image reading unit 120 (see FIG. 6) that reads an image of a document and obtains image information. The upper housing 106 is connected to the upper rear end of the main body side housing 104 at the lower rear end thereof by the lower first connecting portion 106a (see FIG. 2). Further, the lower surface of the upper housing 106 is connected to the upper surface of the main body upper cover 104a by the lower second connecting portion 106b (see FIG. 2). Therefore, when the upper housing 106 is in a closed state (see FIG. 1) or an open state (see FIG. 2), the main body upper cover 104a is in a closed state (FIG. 1) in conjunction with opening and closing of the upper housing 106. Reference) or open state (see FIG. 2). Further, the upper housing 106 includes an operation panel 106d arranged so as to protrude forward. The operation panel 106d includes an operation unit 150 including a plurality of keys and a display unit 151.

As shown in FIG. 6, the document conveying unit 107 conveys the document G to the image reading position J in the image reading unit 120. As illustrated in FIGS. 3 and 7, the document conveying unit 107 includes a reading unit cover member that is disposed on an upper portion of the upper housing 106 so as to be freely opened and closed and covers the image reading unit 120 in the closed state. The reading unit cover member includes a document stacking unit 720 (described later).
The document conveying portion 107 is connected to the upper rear end portion of the upper housing 106 at the lower rear end portion thereof by the upper third connecting portion 106c (see FIG. 3).

  In addition, the upper housing 106 and the document conveyance unit 107 include an opening restriction mechanism 500. The opening restriction mechanism 500 is configured such that the reading unit cover member and the document stacking unit 720 as the second upper housing are opened with respect to the upper housing 106 in a state where the upper housing 106 is opened with respect to the main body housing 104. (Change from the state shown in FIG. 2 to the state shown in FIG. 4) is regulated. The opening restriction mechanism 500 starts from the state where the document conveying unit 107 is closed with respect to the upper housing 106 and the upper housing 106 is closed with respect to the main body housing 104 (see FIG. 1). When the housing 106 is in an open state with respect to the main body housing 104 (see FIG. 2), the original conveyance unit 107 functions so as not to open with respect to the upper housing 106. Details of the opening restriction mechanism 500 will be described later.

Next, the details of the apparatus main body M having the main body side housing 104 will be described with reference to FIG.
As shown in FIG. 5, the apparatus main body M has an image forming unit GK that forms a predetermined image on a paper T based on predetermined image information, and supplies the paper T to the image forming unit GK and an image is formed. A paper supply / discharge section KH that discharges the paper T;
The main body side housing 104 forms the outer shape of the apparatus main body M. An image forming unit GK, a paper supply / discharge unit KH, and the like are arranged inside the main body side housing 104.

  As shown in FIG. 5, the image forming unit GK includes a photosensitive drum 2, a charging unit 10, a laser scanner unit 4, a developing device 16, a toner cartridge 5, a toner supply device 6, and a transfer roller 8. A drum cleaning device 11 and a fixing unit 9 as a fixing unit are provided.

  The paper supply / discharge unit KH includes a supply cassette 52, a manual feed tray 65, a registration roller pair 80, and a transport path L for the paper T.

  The photosensitive drum 2 is made of a cylindrical member and functions as an image carrier. The photosensitive drum 2 is disposed in the apparatus main body M in a manner that can rotate around a rotation axis perpendicular to the paper surface of FIG. An electrostatic latent image is formed on the surface of the photosensitive drum 2.

  The charging unit 10 is disposed on the upper side (upward) of the photosensitive drum 2 in the vertical direction. The charging unit 10 uniformly charges the surface of the photosensitive drum 2 positively (plus polarity).

  The laser scanner unit 4 is disposed on the upper side (upward) in the vertical direction of the photosensitive drum 2 and is separated from the photosensitive drum 2. The laser scanner unit 4 includes a laser light source (not shown), a polygon mirror, a polygon mirror driving motor, and the like.

  The laser scanner unit 4 scans and exposes the surface of the photosensitive drum 2 based on the image information output from the image reading unit 120. By scanning exposure by the laser scanner unit 4, the electric charge charged on the surface of the photosensitive drum 2 is removed. As a result, an electrostatic latent image is formed on the surface of the photosensitive drum 2.

  The developing device 16 is disposed in front of the photosensitive drum 2 (on the right side in FIG. 5). The developing device 16 develops a monochrome (usually black) toner image on the electrostatic latent image formed on the photosensitive drum 2. The developing device 16 includes a developing roller 17 that can be disposed facing the photosensitive drum 2 and a stirring roller 18 for stirring the toner.

The toner cartridge 5 stores toner supplied to the developing device 16.
The toner supply device 6 supplies the toner stored in the toner cartridge 5 to the developing device 16.

  The drum cleaning device 11 is disposed behind the photosensitive drum 2 (on the left side in FIG. 5). The drum cleaning device 11 removes toner and deposits remaining on the surface of the photosensitive drum 2.

  The transfer roller 8 directly transfers the toner image developed on the surface of the photosensitive drum 2 onto the paper T. A transfer bias for transferring the toner image developed on the photosensitive drum 2 to the paper T is applied to the transfer roller 8 by a voltage application unit (not shown).

  In this embodiment, the toner image developed on the surface of the photosensitive drum 2 is directly transferred to the paper T without using an intermediate transfer belt or the like. However, the present invention is not limited to this. For example, the toner image developed on the surface of the photosensitive drum 2 can be indirectly transferred onto the paper T via an intermediate transfer belt or the like.

The transfer roller 8 is configured to be movable between a contact position where the transfer roller 8 is in contact with the photosensitive drum 2 and a spaced position where the transfer roller 8 is separated from the photosensitive drum 2. Specifically, the transfer roller 8 is moved to the contact position when the toner image developed on the photosensitive drum 2 is transferred to the paper T, and is moved to the separation position in other cases.
Here, the paper T is sandwiched between the photosensitive drum 2 and the transfer roller 8 and pressed against the surface of the photosensitive drum 2 (the side on which the toner image has been developed). In this way, a transfer nip N as a transfer portion is formed, and the toner image developed on the photosensitive drum 2 is transferred to the paper T.

  The fixing unit 9 melts the toner constituting the toner image transferred onto the paper T and fixes it on the paper T. The fixing unit 9 includes a heating roller 9a heated by a heater and a pressure roller 9b pressed against the heating roller 9a. The heating roller 9a and the pressure roller 9b convey the paper T onto which the toner image has been transferred so as to sandwich the paper T. By transporting the paper T so as to be sandwiched between the heating roller 9a and the pressure roller 9b, the toner transferred onto the paper T is melted and fixed on the surface of the paper T.

  The supply cassette 52 is disposed at the lower part (lower side in the vertical direction) of the apparatus main body M. The supply cassette 52 is arranged on the front side (right side in FIG. 5) of the apparatus main body M so as to be able to be pulled out in the horizontal direction. The supply cassette 52 includes a placement plate 60 on which the paper T is placed. The paper T is stored in the supply cassette 52 in a state where the paper T is stacked on the placement plate 60. The cassette supply unit 51 is disposed at the end of the supply cassette 52 on the paper feed side (the right end in FIG. 5). The cassette supply unit 51 sends out the paper T stored in the supply cassette 52 to the transport path L.

  The cassette supply unit 51 includes a multi-feed prevention mechanism including a forward feed roller 61 that takes out the paper T placed on the placement plate 60 and a roller pair 63 that feeds the paper T one by one to the transport path L.

  A conveyance path L for conveying the paper T is formed between the cassette supply unit 51 or the manual feed unit 64 and the paper discharge unit 50. The conveyance path L includes a first conveyance path L1 from the cassette supply unit 51 to the first junction P1, a second conveyance path L2 from the first junction P1 to the registration roller pair 80, and a registration roller pair 80 to the transfer roller. 8, a fourth transport path L4 from the transfer roller 8 to the fixing section 9, a fifth transport path L5 from the fixing section 9 to the branch section P3, and a discharge section 50 from the branch section P3. And a sixth transport path L6.

  Moreover, the conveyance path L has the 7th conveyance path L7 from the manual feed tray 65 to the 1st confluence | merging part P1. The first junction P1 is a junction between the first conveyance path L1 that conveys the paper T from the cassette supply unit 51 and the seventh conveyance path L7 that conveys the paper T from the manual feed tray 65.

  A second junction P2 is disposed in the middle of the second transport path L2. Furthermore, the conveyance path L has a return conveyance path Lb from the branching part P3 to the second joining part P2. The second junction P2 is a junction between the second conveyance path L2 and the return conveyance path Lb.

  Here, a registration roller pair 80 is arranged on the upstream side (right side in FIG. 5) of the transfer roller 8 in the transport direction of the paper T. The registration roller pair 80 is a roller pair for correcting skew (oblique supply) of the paper T and adjusting timing with the toner image.

  The return conveyance path Lb is a conveyance path that is provided so that the opposite surface (non-printing surface) to the surface that has already been printed faces the photosensitive drum 2 when performing duplex printing on the paper T.

  According to the return conveyance path Lb, the sheet T conveyed from the branching section P3 to the paper discharge section 50 side can be reversed and returned to the second conveyance path L2. A predetermined toner image is transferred onto the non-printing surface by the photosensitive drum 2 on the paper T that has been turned upside down by the return conveyance path Lb.

  A manual feed unit 64 is provided on the front side of the apparatus main body M (on the right side in FIG. 5) and above the supply cassette 52. The manual feed supply unit 64 includes a manual feed tray 65 and a supply roller 66. The base of the manual feed tray 65 is attached to the vicinity of the entrance of the seventh transport path L7 so as to be rotatable (openable and closable). The manual feed tray 65 constitutes a part of the front surface of the apparatus main body M in the closed state. The supply roller 66 takes out the paper T placed on the manual feed tray 65 and sends it out toward the seventh transport path L7.

  The manual feed unit 64 supplies the paper T placed on the open manual feed tray 65 to the second transport path L2 via the seventh transport path L7 and the first junction P1.

  A paper discharge unit 50 is formed at the end of the sixth transport path L6. The paper discharge unit 50 is disposed on the upper side of the apparatus main body M. The paper discharge unit 50 opens toward the front of the apparatus main body M (to the right in FIG. 5). The paper discharge unit 50 discharges the paper T on which the toner is fixed by the fixing unit 9 to the outside of the apparatus main body M.

  On the opening side of the paper discharge unit 50, a paper discharge stacking unit M1 is formed. The paper discharge stacking unit M1 is formed on the upper surface (outer surface) of the apparatus main body M. The paper discharge stacking unit M1 is a part formed by recessing the upper surface of the apparatus main body M downward (vertically in the vertical direction). The bottom surface of the paper discharge stacking unit M1 constitutes a part of the top surface of the apparatus main body M. In the paper discharge stacking unit M1, sheets T on which a predetermined image transferred from the paper discharge unit 50 is transferred are stacked and stacked.

The image reading unit 120 performs predetermined processing on an illumination unit including a light source, a plurality of mirrors forming an optical path, an imaging lens, a CCD as a reading unit, and image information read by the CCD. And a CCD substrate for outputting the image information to the apparatus main body M side.
In the document conveying unit 107, an image formed on the document G conveyed to the image reading position J is read by the CCD.

The image information output from the image reading unit 120 is output from the image reading unit 120 to the apparatus main body M.
In the apparatus main body M, the input image information is input to an image formation control unit (not shown). The image formation control unit controls the photosensitive drum 2, the charging unit 10, the laser scanner unit 4, the developing device 16, and the like that constitute the image forming unit GK based on the image information. A predetermined toner image is formed on the photosensitive drum 2 based on the image information.

  The same image as the image of the original G is transferred to the paper T conveyed to the transfer nip N formed by the photosensitive drum 2 via the conveyance path L based on the image information. The paper T on which the image is formed is discharged from the paper discharge unit 50 to the paper discharge stacking unit M1.

Next, the document conveying unit 107 will be described in detail.
As shown in FIG. 6, the document transport unit 107 includes a transport mechanism housing 701, a document placement unit 710, a document stacking unit 720, and an intermediate tray 730.

The transport mechanism housing 701 is a housing in which the transport mechanism in the document transport unit 107 is housed.
The document placing portion 710 is a portion on which the document G before the image is read is placed.
The document stacking unit 720 is a portion on the lower side in the vertical direction of the document placing unit 710 and is a portion on which the document G that has passed a predetermined image reading position J is stacked. The document stacking unit 720 also functions as a reading unit cover member that covers the image reading unit 120 in the closed state.

  The intermediate tray 730 is disposed between the document placing unit 710 and the document stacking unit 720, and the space K between the document placing unit 710 and the document stacking unit 720 is defined as the first space K1 on the document stacking unit 720 side. This tray is divided into a second space K2 on the document placement portion 710 side.

  As shown in FIGS. 1 and 6, the document placing portion 710 includes a placement portion tray 711, a document pressing portion 712, a tray support wall 715, a standby portion 713, and a separation wall 714.

  A pair of document pressing portions 712 are provided on the base end side (document conveying portion 107 side) on the placement surface (upper surface) of the placement portion tray 711. The pair of document pressing portions 712 are slidably disposed so as to be relatively close to or away from the width direction of the placement portion tray 711 (the left-right direction of the document conveying portion 107) according to the width of the document G.

The tray support wall 715 is a wall portion that supports the placement unit tray 711. The tray support wall 715 is provided on the base end side (the document conveying unit 107 side) of the placement unit tray 711.
The tray support wall 715 includes a left support wall 715a on the left side (front side in FIG. 6) of the document transport unit 107 and a right support wall 715b on the right side (back side in FIG. 6) of the document transport unit 107. The left support wall 715a and the right support wall 715b are plate-like members extending in the vertical direction.

The standby unit 713 is provided inside the transport mechanism housing 701 and is formed to extend in a substantially horizontal direction along the transport direction of the document G. On the upper surface of the standby unit 713, a front end portion (downstream end portion in the feeding direction C) of the document G is disposed.
The separation wall 714 is a wall portion that is disposed on the downstream side in the feeding direction C in the standby unit 713 and is inclined so as to go upward in the vertical direction toward the downstream side in the feeding direction C.
The document G placed on the document placement unit 710 enters a standby state at the standby unit 713 when the front end portion abuts against the separation wall 714. Then, the original G waiting in a stacked state in the standby portion 713 is satisfactorily separated (squeezed) when the front end portion passes over the separation wall 714.

  As shown in FIG. 6, the transport mechanism housing 701 includes a first document discharge unit 702, a second document discharge unit 703, a first transport unit, a second transport unit, and a third transport unit. It has been.

The first document discharge unit 702 is a portion that faces the first space K1 and discharges the document G toward the first space K1.
The second document discharge portion 703 is a portion that faces the second space K2 and discharges a part of the document G toward the second space K2.
The first conveying unit is a unit that conveys the document G placed on the document placing unit 710 to the image reading position J.
The second transport unit is a unit that transports the document G located at the image reading position J to the first document discharge unit 702.
The third conveying means is means for switching the document G located at the image reading position J back to the image reading position J by using the second space K2 to be switched back and reversed.

  The first transport unit includes a pickup roller 741, a feeding roller 742, a separation pad 743, and a pre-reading roller pair 745.

  The pickup roller 741 is configured to be movable between a home position separated from the original G and a pickup position that slightly contacts the surface of the original G. The pickup roller 741 is configured to move from the home position to the pickup position when driven to rotate. The pickup roller 741 is configured to return from the pickup position to the home position after feeding the document G.

  The feeding roller 742 is configured to be able to contact the separation pad 743.

  The pre-reading roller pair 745 is disposed on the upstream side in the feeding direction C of the image reading position J. The pre-reading roller pair 745 conveys the original G fed by the feeding roller 742 toward the image reading position J while sandwiching the original G.

  A document guide 746 is disposed above the image reading position J in the vertical direction. The document guide 746 is disposed opposite to the transmission member 122 with a small gap in order to form a transport path for the document G at the image reading position J.

  A portion (vertical direction lower side) corresponding to the image reading position J in the transport mechanism housing 701 is open. As a result, the document G (the surface on which the image to be read is formed) is arranged to face the transmissive member 122 constituting the reading surface in the image reading unit 120 when passing through the image reading position J.

  The first document discharge unit 702 is provided with a first discharge roller pair 753. The first discharge roller pair 753 discharges the original G conveyed to the first discharge roller pair 753 to the first space K1.

  A second discharge roller pair 754 is disposed in the second document discharge portion 703. The second discharge roller pair 754 discharges the document G conveyed to the second discharge roller pair 754 to the second space K2.

  The second transport means includes a post-reading roller pair 751, a switching member 752, and a first discharge roller pair 753. The second transport unit transports the document G located at the image reading position J to the first document discharge unit 702.

  The post-reading roller pair 751 conveys the original G conveyed from the image reading position J to the downstream side (switching member 752 side) in the feeding direction C.

The switching member 752 is disposed on the downstream side in the feeding direction C of the post-reading roller pair 751 and upstream of the first discharge roller pair 753 or the second discharge roller pair 754.
The switching member 752 has a first position for guiding the document G conveyed from the roller pair 751 after reading to the first document discharge unit 702 (first discharge roller pair 753) side, and a second document discharge unit 703 (second discharge). It is arranged so that it can be switched (swinged) to the second position guided to the roller pair 754) side.

  The third transport means includes a post-reading roller pair 751, a switching member 752, and a second discharge roller pair 754. The third transport unit transports the document G located at the image reading position J back to the image reading position J by switching back and upside down using the second space K2.

Next, the details of the opening restriction mechanism 500, which is a characteristic part of the present invention, will be described with reference to FIGS.
FIG. 8 is an enlarged view of the vicinity of the second engagement member 520 in FIG. FIG. 9 is a perspective view illustrating the vicinity of the second engagement member 520 in a state where the document conveying unit 107 is closed with respect to the upper housing 106. FIG. 10 is a perspective view showing the vicinity of the second engagement member 520 in a state where the second engagement member 520 is pushed upward. FIGS. 11A and 11B are schematic views showing the engaging operation between the second engaging member 520 and the first engaging member 510, where FIG. 11A shows the engaged state, and FIG. 11B shows the released state. FIG.

  The document accumulating unit 720 is a part that also functions as a reading unit cover member in the document conveying unit 107, and is connected to the upper casing 106 by a pair of upper third connecting units 106c as shown in FIG. Is done. The pair of upper third connecting portions 106 c are disposed on both sides of the document stacking unit 720 in the width direction (document transport direction). The open / close shaft 106c1 of the upper third connection portion 106c is parallel to the open / close shaft 106a1 (see FIG. 2) of the lower first connection portion 106a that connects the upper housing 106 to the main body housing 104 so as to be freely opened and closed. ing. As shown in FIGS. 2 and 3, the opening / closing direction of the document stacking unit 720 and the opening / closing direction of the upper housing 106 are the same direction.

  The opening restriction mechanism 500 is provided on the outer side in the width direction with respect to the upper third connecting portion 106 c on one side in the width direction of the upper casing 106 and the document conveying unit 107. As shown in FIGS. 7 to 11, the opening restriction mechanism 500 includes a first engagement member 510 and a second engagement member 520 that can be engaged with the first engagement member 510. The opening restriction mechanism 500 is configured such that the document stacking unit 720 is in a state where the upper housing 106 is opened with respect to the main body side housing 104 by the first engagement member 510 and the second engagement member 520 being engaged. Is restricted from opening with respect to the upper housing 106.

  The first engagement member 510 (see FIG. 11) is provided on the upper housing 106. The first engagement member 510 is located on the lower side (inside) of a through hole 501 (see FIGS. 7 and 8) formed in the upper surface portion of the upper housing 106. As shown in FIG. 11, the first engagement member 510 has a movable side portion 511 and an engagement claw portion 512. The movable side portion 511 is a portion that can swing (turn) with respect to the upper housing 106 with the lower end side as a fulcrum. The engaging claw portion 512 is formed integrally with the upper end portion of the movable side portion 511. The engagement claw portion 512 is a hook-shaped portion that can be engaged and disengaged with respect to the engagement portion 521 of the second engagement member 520 by swinging the movable side portion 511.

  The second engagement member 520 is provided in the document stacking unit 720 so as to protrude toward the upper housing 106 side. As shown in FIGS. 9 and 10, the second engagement member 520 is rotatably connected to a mount 522 fixed to the document stacking unit 720. The mount 522 includes a bottom plate portion 522a and a pair of side plate portions 522b that are bent on both sides of the bottom plate portion 522a and rise upward.

  The second engagement member 520 is rotatably supported via a rotation shaft 525. The rotation shaft 525 is spanned between the pair of side plate portions 522b of the mount 522. The second engagement member 520 has a shaft side portion 523 and an engagement side portion 524. The shaft side portion 523 extends along the bottom plate portion 522a in a natural state. The engagement side portion 524 is substantially orthogonal to the shaft side portion 523, and extends so as to protrude to the lower upper housing 106 side through a through hole 522 c formed in the bottom plate portion 522 a of the mount 522.

The engagement side portion 524 of the second engagement member 520 has an engagement portion 521 that engages with the engagement claw portion 512 of the first engagement member 510. As shown in FIG. 11, the engaging portion 521 includes a concave portion that is recessed from one side surface of the engaging side portion 524 toward the other side surface.
Note that the engaging portion 521 is not limited to the concave portion, and can be formed, for example, from a through hole penetrating from one side surface of the engaging side portion 524 to the other side surface.

  The rotation shaft 525 is a shaft that rotatably supports the shaft-side portion 523 of the second engagement member 520. A helical spring 526 is wound around the rotation shaft 525. One end 526a of the helical spring 526 is locked and fixed at a fixed position on the document stacking unit 720 side. Further, the other end 526 b of the helical spring 526 is in contact with the shaft side portion 523 of the second engagement member 520. Accordingly, the second engagement member 520 is urged by the helical spring 526 so that the engagement side portion 524 including the engagement portion 521 protrudes from the document stacking portion 720 toward the upper housing 106 side. Yes. Further, the second engagement member 520 is configured to be movable from the upper housing 106 toward the document stacking unit 720 by rotating about the rotation shaft 525.

Next, the operation of the opening restriction mechanism 500 will be described.
In the state shown in FIG. 1 in which the document conveying unit 107 is closed with respect to the upper casing 106 and the upper casing 106 is closed with respect to the main body-side casing 104, the second restriction mechanism 500 has a second state. The engagement side portion 524 of the engagement member 520 is rotated around the rotation shaft 525 by the urging force of the helical spring 526, and as shown in FIG. 9, from the document stacking unit 720 to the upper housing 106 side. Protrusively toward.

  Then, the engagement portion 521 in the engagement side portion 524 protruding toward the upper housing 106 side is engaged with the first engagement member 510 provided in the upper housing 106 as shown in FIG. Engaged with the claw portion 512. By engaging the second engagement member 520 and the first engagement member 510 in this manner, the upper housing 106 is changed from the state shown in FIG. 1 to the main body side housing 104 as shown in FIG. On the other hand, it is possible to restrict (prevent) the document stacking unit 720 of the document transport unit 107 from opening with respect to the upper housing 106 during and in the middle of opening.

  Further, as shown in FIG. 11B, the movable side portion 511 of the first engagement member 510 in the opening restriction mechanism 500 is rotated (swinged) outward to engage the first engagement member 510. The engagement between the claw portion 512 and the engagement portion 521 of the second engagement member 520 can be released. Thereby, the document stacking unit 720 of the document transport unit 107 can be opened and closed with respect to the upper housing 106 in the state shown in FIG. is there.

  When the document stacking unit 720 of the document transport unit 107 is opened and closed with respect to the upper housing 106, the engagement side portion 524 of the second engagement member 520 protrudes toward the upper housing 106. For this reason, the protruding engagement portion 524 of the second engagement member 520 comes into contact with the user's hand, or between the protruding end of the engagement portion 524 and the upper surface portion of the upper housing 106. There is a risk of pinching your fingers. However, even if this happens, as shown in FIG. 10, the second engagement member 520 rotates around the rotation shaft 525 against the urging force of the helical spring 526, It moves toward the document stacking unit 720 side and is stored inside the mount 522. Therefore, the second engagement member 520 can reduce the possibility that the user will injure his hand or finger.

According to the copying machine 1 of the first embodiment, for example, the following effects are achieved.
In the copier 1 of the first embodiment, the opening restriction mechanism 500 that restricts the document stacking unit 720 from opening with respect to the upper housing 106 when the upper housing 106 is opened with respect to the main body housing 104 is provided. A first engagement member 510 provided in the upper housing 106 and a second engagement provided in the document stacking portion 720 so as to protrude toward the upper housing 106 and engageable with the first engagement member 510. Member 520. The second engaging member 520 is biased so as to protrude from the document stacking unit 720 toward the upper housing 106 side, and is configured to be movable from the upper housing 106 toward the document stacking unit 720 side. The

  Therefore, even when the user's hand or finger contacts the second engaging member 520 protruding from the document stacking unit 720 to the upper housing 106 side when the document stacking unit 720 is opened and closed with respect to the upper housing 106. The second engagement member 520 rotates around the rotation shaft 525 against the urging force contributing to the protrusion and moves toward the document stacking unit 720 side. Thereby, the force related to the contact is absorbed and relaxed. Therefore, the possibility that the user may be injured in the hand or finger can be sufficiently reduced.

  Next, a second embodiment of the present invention will be described with reference to FIG. 12A and 12B are enlarged right side views showing the configuration of the second engagement member 520 in the copying machine 1 according to the second embodiment. FIG. 12A is a diagram showing a natural state, and FIG. FIG.

  The opening restriction mechanism 500 of the second embodiment is mainly different from the opening restriction mechanism 500 of the first embodiment in the configuration of the second engagement member 520. The second embodiment will be described with a focus on differences from the first embodiment, and the description of the same configuration as the first embodiment will be omitted. For the points not specifically described in the second embodiment, the description of the first embodiment is appropriately applied or adopted.

  As shown in FIG. 12, the second engagement member 520 in the second embodiment includes a shaft side portion 523 including a rotation shaft 525 and an engagement side portion 524 having an engagement portion 521. The engagement portion 521 engages with a hook-like engagement claw portion 512 in the first engagement member 510. The engagement side portion 524 is supported to be rotatable around another rotation shaft 530 with respect to the shaft side portion 523 at a position near the tip of the shaft side portion 523.

  Similar to the first embodiment, the engagement-side portion 524 including the engagement portion 521 protrudes from the document stacking portion 720 toward the upper housing 106 by the helical spring 526 wound around the rotation shaft 525. It is so energized.

  Further, another helical spring 531 is wound around another rotating shaft 530 positioned near the tip of the shaft side portion 523. The other helical spring 531 is set so that an urging force smaller than the urging force of the helical spring 526 is generated. One end portion 531a of another helical spring 531 is locked and fixed at a fixed position on the document stacking portion 720 side. The other end 531 b of another helical spring 531 is in contact with the engagement side portion 524. Accordingly, as shown in FIG. 12A, the engagement side portion 524 is attached so as to protrude from the document stacking portion 720 toward the upper housing 106 side in a posture substantially orthogonal to the shaft side portion 523. It is energized. As shown in FIG. 12B, the engagement-side portion 524 is rotatable around the rotation shaft 530 so that the engagement-side portion 524 has a substantially straight posture with respect to the shaft-side portion 523. It is configured.

According to the opening restriction mechanism 500 of the second embodiment, for example, the following effects are exhibited.
In the opening restriction mechanism 500 of the second embodiment, the engagement side portion 524 of the second engagement member 520 is configured to be rotatable with respect to the shaft side portion 523.
Therefore, according to the opening restriction mechanism 500 of the second embodiment, when the document stacking unit 720 is opened and closed with respect to the upper housing 106, the second engagement protruding from the document stacking unit 720 to the upper housing 106 side. When the user's hand or finger comes into contact with the member 520, only the engagement side portion 524 of the second engagement member 520 resists the biasing force of the helical spring 531 having a small biasing force with respect to the shaft side portion 523. By rotating around the rotation shaft 530, the force related to the contact is absorbed and relaxed. That is, the engagement side portion 524 is housed inside the mount 522 only by the user's hand or finger touching the engagement side portion 524 with a light force. Therefore, the possibility that the user may be injured in the hand or finger can be further effectively reduced.

  Subsequently, a third embodiment of the present invention will be described with reference to FIGS. 13 and 14. 13A and 13B are diagrams showing the configuration of the second engagement member 520 in the copying machine 1 according to the third embodiment, where FIG. 13A is an enlarged perspective view and FIG. 13B is an enlarged right side view. 14 is a right side view showing an operation when the second engagement member 520 shown in FIG. 13 is pressed upward, and FIG. 14A is a diagram showing an operation state when a force is applied from directly below. B is a diagram illustrating an operation state when a force is applied obliquely from the lower left, and (C) is a diagram illustrating an operation state when the force is applied from an oblique lower right.

  The opening restriction mechanism 500 of the third embodiment is different in the configuration of the second engagement member 520 from the opening restriction mechanism 500 of the first embodiment. About 3rd Embodiment, it demonstrates centering around a different point from 1st Embodiment, and abbreviate | omits description about the structure similar to 1st Embodiment. For the points not specifically described in the third embodiment, the description of the first embodiment is appropriately applied or adopted.

  As shown in FIGS. 13A and 13B, the second engagement member 520 in the third embodiment includes an engagement side portion 524, a coil spring 540 as a biasing member, and a pair of first extensions. Part 541, a pair of second extension parts 542, and a second extension part movement restriction part 543. The engagement side portion 524 has an engagement portion 521 that engages with a hook-like engagement claw portion 512 in the first engagement member 510.

  The coil spring 540 linearly biases the engagement side portion 524 toward the tip end portion 524a side. The pair of first extending portions 541 extend left and right from the base end portion 524b of the engaging side portion 524. The pair of second extending portions 542 extend from the vicinity of the end portions on the extending side of the pair of first extending portions 541 in a direction orthogonal to the first extending portion 541. The second extension part movement restriction part 543 is provided corresponding to each of the pair of second extension parts 542. The second extending portion movement restricting portion 543 is open upward and has a chipped shape so as not to contact the first extending portion 541. The second extending portion movement restricting portion 543 is configured to receive the pair of second extending portions 542 and restrict the movement of the pair of second extending portions 542 due to the urging force of the coil spring 540. .

  In the opening restriction mechanism 500 configured as described above, when the document stacking unit 720 is opened and closed with respect to the upper housing 106, the engagement side portion 524 that protrudes from the document stacking unit 720 to the upper housing 106 side. When the user's hand or finger comes into contact with the distal end portion 524a and the engagement side portion 524 is pressed directly upward, the engagement side portion 524 has a coil spring 540 as shown in FIG. It moves linearly toward the base end portion 524b against the urging force. As a result, the engagement side portion 524 is retracted (stored) on the document stacking unit 720 side.

Further, when the user's hand or finger comes into contact with the tip of the engagement side portion 524 and the engagement side portion 524 is pressed obliquely from the lower left, as shown in FIG. The portion 524 is rotated clockwise with the second extending portion 542 on one side (right side) as a fulcrum, and is retracted (stored) on the document stacking portion 720 side.
Further, when the user's hand or finger comes into contact with the tip of the engagement side portion 524 and the engagement side portion 524 is pressed obliquely from the lower right, as shown in FIG. 524 is rotated counterclockwise with the second (left) second extending portion 542 as a fulcrum and is retracted (stored) on the document stacking portion 720 side.

According to the opening restriction mechanism 500 of the third embodiment, for example, the following effects are exhibited.
In the opening restriction mechanism 500 of the third embodiment, the second engagement member 520 is engaged with an engagement side portion 524 having an engagement portion 521 that engages with the first engagement member 510, and the engagement side portion 524. A coil spring 540 that urges toward the distal end portion 524a side of the mating side portion 524, a pair of first extending portions 541 that extend from the engaging side portion 524, and a pair of first extending portions 541 that extend from each of them. A pair of second extending portions 542 to be output and a pair of second extending portions 542 provided corresponding to each of the pair of second extending portions 542 and receiving a pair of second extending portions 542, respectively, and a pair of second extending portions by the biasing force of the coil spring 540 A second extending portion movement restricting portion 543 that restricts the movement of the extending portion 542. When the engaging side portion 524 is pressed, the engaging side portion 524 moves toward the base end portion 524b. Or of the pair of second extending portions 542 Square or the other is configured to perform the rotation of the fulcrum.

  Therefore, according to the opening restriction mechanism 500 of the third embodiment, when the document stacking unit 720 is opened and closed with respect to the upper housing 106, the second mechanism protruding from the document stacking unit 720 to the upper housing 106 side. When the user's hand or finger comes into contact with the joint member 520 and the engagement side portion 524 of the second engagement member 520 is pressed from below, the second engagement member 520 is connected to the base of the engagement side portion 524. Move to the end 524b side. Similarly, when the engagement side portion 524 of the second engagement member 520 is pressed obliquely from the lower left side or the lower right side, the second engagement member 520 is connected to one or the other of the pair of second extending portions 542. Rotate around the fulcrum. In this way, it is possible to absorb and relieve the pressing force acting on the engagement side portion 524, that is, the force acting on the user's hand or finger. Accordingly, even if the user touches the second engagement member 520 from various directions, the risk of injury to the hand or finger can be effectively reduced.

As mentioned above, although preferred embodiment was described, this invention can be implemented with a various form, without being limited to each embodiment mentioned above.
For example, in each embodiment, the reading unit cover member includes the document stacking unit 720 that forms part of the document transport unit 107 that transports the document G to the image reading position J in the image reading unit 120. This is not a limitation. For example, the reading unit cover member can be formed of a simple cover member that does not form the document conveying unit 107.

In the first and second embodiments, the second engagement member 520 is configured to be movable from the upper housing 106 toward the document stacking unit 720 by rotating, but is not limited thereto. . For example, the second engagement member 520 may be configured to be linearly movable from the upper housing 106 toward the document stacking unit 720 side.
Although the monochrome copying machine 1 is described as the image forming apparatus, the present invention is not limited to this, and a color copying machine, a printer, a facsimile, or a complex machine of these may be used.

  DESCRIPTION OF SYMBOLS 1 ... Copy machine (image forming apparatus), 104 ... Main body side housing, 106 ... Upper housing (first upper housing), 106a1 ... Opening / closing axis, 106c1 ... Opening / closing axis, 107 ... Document conveyance , 120... Image reading unit, 500... Opening restriction mechanism, 510... First engagement member, 520... Second engagement member, 521. ... engagement side part, 524a ... distal end part, 524b ... base end part, 525 ... rotating shaft, 526 ... helical spring, 540 ... coil spring (biasing member), 541 ... first extension Output part, 542... Second extension part, 543... Second extension part movement restricting part, 720... Document stacking part (reading part cover member, second upper housing), G. ... Image forming part, J ... Image reading position, T ... Paper (sheet)

Claims (6)

A main body side housing having an image forming section for forming an image on a sheet;
A first upper housing disposed to be opened and closed at an upper portion of the main body side housing;
A second upper housing disposed to be opened and closed at an upper portion of the first upper housing;
An image forming apparatus comprising: an opening restricting mechanism that restricts the second upper case from being opened relative to the first upper case when the first upper case is opened relative to the main body side case. Because
The opening restriction mechanism includes a first engagement member provided in the first upper housing, a second engagement member provided in the second upper housing so as to protrude toward the first upper housing, and the first engagement member. A second engaging member engageable with the first upper member, and the second upper member is engaged with the first upper member by engaging the first engaging member with the second engaging member. Against opening and against
The second engagement member is urged so as to protrude from the second upper casing toward the first upper casing, and from the first upper casing toward the second upper casing. Configured to be movable,
The second engagement member includes a shaft-side portion including the rotation shaft, and an engagement-side portion having an engagement portion that engages with the first engagement member,
The image forming apparatus is configured such that the engagement side portion is rotatable with respect to the shaft side portion. The image forming apparatus according to claim 1, wherein the second engaging member moves by rotating. The image forming apparatus according to claim 1, wherein an opening / closing axis of the second upper casing and an opening / closing axis of the first upper casing are parallel to each other. The image forming apparatus according to claim 3, wherein an opening / closing direction of the second upper housing and an opening / closing direction of the first upper housing are the same. A connecting portion that connects the second upper housing to the first upper housing so as to be openable and closable;
The opening restriction mechanism is disposed between one end portion of the first upper housing and the second upper housing and the connecting portion in the first upper housing and the second upper housing. Item 5. The image forming apparatus according to any one of Items 1 to 4. The second engagement member biases the engagement side portion having an engagement portion that engages with the first engagement member, and the engagement side portion toward the distal end side of the engagement side portion. A pair of first extending portions extending from the engaging side portion, a pair of second extending portions extending from each of the pair of first extending portions, and the pair of second extending portions A second extension portion movement restriction that is provided corresponding to each of the extension portions and receives the pair of second extension portions and restricts the movement of the pair of second extension portions by the urging force of the urging member. And when the engagement side portion is pressed, movement of the engagement side portion toward the proximal end side or one or the other of the pair of second extending portions as a fulcrum The image forming apparatus according to claim 1, wherein the image forming apparatus is configured to perform rotation.

Images