JP4134959B2 - Lock mechanism - Google Patents

Description

  The present invention relates to a technique of a lock mechanism, and more particularly to a mechanism for reliably and easily locking an open / close body provided to be openable / closable to the apparatus main body.

  2. Description of the Related Art A facsimile apparatus, a copying machine, and a multifunction machine having a facsimile function and a copying function of a copying machine are known in which an automatic document feeder (ADF) is disposed above an image forming apparatus. In this type of ADF, several opening / closing bodies are disposed along the document conveyance path, and when a document jam or the like occurs, the opening / closing bodies are opened to perform maintenance. For example, an ADF described in Patent Document 1 includes a guide cover provided on a platen that also serves as a guide surface of a document transport path on a main body of the ADF, and a guide cover that transports a document from the platen to a discharge port. An opening / closing body such as an outer cover that guides the document from the paper feed port to the vicinity of the platen is provided and is rotatably attached to each other shaft (see Patent Document 1).

  The ADF or the like is provided with a lock mechanism for locking the device body with the opening / closing body closed. As a configuration of the lock mechanism, a hook-like engagement member and a convex receiving portion are provided on the apparatus main body and the opening / closing body, and the hook portion of the engagement member is locked by the receiving portion, so that the opening / closing body Is known to be locked to the apparatus body.

However, in such a conventional lock mechanism, any one of the set of engaging members arranged on both side surfaces of the opening / closing body is not completely locked to the receiving portion (one-side lock), and the opening / closing body is the device. There was a case that it was not locked to the main body. If the open / close body is in a one-locked state, the document cannot be transported well when the document is transported or the document information is read in the ADF, or the read image information has a problem.
Therefore, in order to solve such a problem, a locking member is fitted to both end portions of a metal shaft that is laterally arranged with respect to the entire length of the opening / closing body to improve the positioning accuracy of the engaging member. It was configured to prevent a single lock.

Furthermore, in recent years, since a metal shaft is expensive to manufacture, an engagement member is fitted to a resin shaft, or the shaft and the engagement member are integrally formed of resin. Patent Document 2 also proposes a structure in which a metal auxiliary member is attached to a side portion of a resin-formed engaging member to increase the rigidity of the engaging member itself and prevent twisting of the engaging member. (See Patent Document 2).
JP 2002-278175 A JP 2002-359480 A

Indeed, like the conventional lock mechanism, the manufacturing cost is lower when a resin shaft is used as a member for positioning the engaging member than when a metal shaft is used.
However, since the resin shaft is inferior in strength compared to the metal shaft, bending and distortion are likely to occur in the midway portion when the resin shaft is placed laterally with respect to the entire length of the opening / closing body. For this reason, the positioning of the engaging members fitted to both ends of the shaft becomes unstable, resulting in the problem of one-side lock. This is because, as described in Patent Document 2, even if a metal auxiliary member is attached to the engagement member, the above-mentioned problem is still solved because the engagement member is fitted to the resin shaft. Was not.

  Accordingly, the present invention relates to a lock mechanism that solves the above-described conventional problems, and has an object of preventing a single lock and making it possible to securely lock an opening / closing body to an apparatus main body while having a simple configuration. To do.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, according to the first aspect of the present invention, an engagement member provided on one end of an apparatus main body and an opening / closing body provided on the apparatus main body so as to be openable and closable is provided on both sides of the shaft so as to be rotatable. A locking mechanism that locks the opening / closing body to the apparatus main body by being provided with a convex receiving portion formed so as to be engageable with the combined member, and the engaging member is locked to the receiving portion from above. The engaging member includes: an arm portion connected to the shaft; and a hook portion that is engageable with the receiving portion that is formed in a substantially U-shaped notch in front view above the tip of the arm portion. And the horizontal position of the lower side of one of the hooks is formed to be lower than the horizontal position of the lower side of the other hook .

In Claim 2, the engagement member provided in the end part of the apparatus main body and the opening-and-closing body provided in the apparatus main body so that opening and closing is possible, was provided in cooperation with both sides of the shaft, and the engagement member And a convex receiving portion formed so as to be engageable with each other, and the engaging member locks the opening / closing body to the apparatus main body by engaging with the receiving portion from above. The engaging member is provided with an arm portion connected to the shaft, and a hook portion that is engageable with the receiving portion that is cut out in a substantially U shape in front view above the tip of the arm portion. The horizontal positions of the lower sides of both hook portions are formed at substantially the same height, and the edge of the lower side portion of one of the hook portions is formed to have a substantially R shape or a chamfered shape when viewed from the front. The edge of the lower side of the other hook part is formed to be substantially perpendicular.

In Claim 3, the engagement member provided in the end part of the main body of the apparatus and the opening-and-closing body provided in the apparatus main body so that opening and closing is possible, was provided in cooperation with the both sides of the shaft, and the engagement member And a convex receiving portion formed so as to be engageable with each other, and the engaging member locks the opening / closing body to the apparatus main body by engaging with the receiving portion from above. The engaging member is provided with an arm portion connected to the shaft, and a hook portion that is engageable with the receiving portion that is cut out in a substantially U shape in front view above the tip of the arm portion. Thus, the lower side portion of one of the hook portions is formed so as to be inclined downward from the horizontal position of the lower side portion of the other hook portion toward the edge portion in a substantially tapered shape in plan view.

  As effects of the present invention, the following effects can be obtained.

Since it was set as the structure shown in Claim 1, since one engaging member latches to a receiving part earlier than the other engaging member, it only makes it engage with the other engaging member carefully. One-side lock can be easily prevented, and the opening / closing body can be securely locked to the apparatus main body.

Since it was set as the structure shown in Claim 2, since one engaging member latches to a receiving part earlier than the other engaging member, it only makes it engage with the other engaging member carefully. One-side lock can be easily prevented, and the opening / closing body can be securely locked to the apparatus main body.

Since it was set as the structure shown in Claim 3, since one engagement member latches in a receiving part earlier than the other engagement member, it only makes it engage in a receiving part with the other engagement member carefully. One-side lock can be easily prevented, and the opening / closing body can be securely locked to the apparatus main body.

Next, embodiments of the invention will be described.
FIG. 1 is a perspective view of a multifunction machine having a lock mechanism according to the present invention, FIG. 2 is a front view showing an internal configuration of an ADF, FIG. 3 is a perspective view showing an arrangement configuration of engagement members and shafts, and FIG. Is a front view of the engaging member, FIG. 5 is a state diagram showing how the engaging member is locked to the receiving portion, FIG. 6 is a front view of the engaging member comparing the shapes of the hook portions, and FIG. FIG. 8 is a front view of an engagement member showing another embodiment, and FIG. 8 is a front view of the engagement member showing another embodiment.
In the following, the multi-function device 1 provided with the lock mechanism 50 according to the present invention has a facsimile function and a copy function of a copying machine. However, the present embodiment is not limited to this, and the lock function 50 The mechanism 50 can be applied to a simple facsimile machine, copier, and the like.

First, the overall configuration of the multifunction machine 1 will be outlined below.
Hereinafter, for the sake of convenience, the direction of the arrow A shown in FIG.
As shown in FIG. 1, the apparatus main body of the multifunction machine 1 is placed and fixed on a paper feeding device 5, and an image reading device 3 and an image recording device 4 are arranged vertically inside the apparatus main body. In this embodiment, a laser printer is employed for the image recording apparatus 4, but details thereof are omitted. An automatic document feeder (hereinafter referred to as “ADF”) 2 is attached above the image reading device 3, and an exterior cover 7 is provided on the right side of the ADF 2 so as to be openable and closable with respect to the apparatus main body of the multifunction device 1. The upper surface of the exterior cover 7 is used as a document discharge tray 10, and a paper feed tray 9 is provided above the discharge tray 10.

  In the multi-function machine 1 configured as described above, the originals placed on the paper feed tray 9 are separated one by one and taken into the ADF 2 from the paper feed port 13, and the image is stored in the CCD of the image reading device 3. And is deposited on the discharge tray 10 through the discharge port 14. The read image information is once recorded by the image recording device 3 and then converted into an electric signal and transmitted to the other party through a telephone line (fax function). It is also possible to convert the signal from the fax machine on the other side into image information, and form and output an image on recording paper stored in the apparatus. It is also possible to transfer the image read by the image reading device 3 as it is to the paper by the image recording device 4 without transmitting it (copy function).

Next, ADF2 will be described below.
As shown in FIG. 2, the ADF 2 in this embodiment has an opening / closing body (ADF cover 21) provided above the main body of the apparatus that can be opened, and a document jam occurs in the document conveyance paths 23 and 24. In some cases, maintenance is easily performed from above the apparatus main body. The ADF 2 includes an ADF main body 20 that forms a guide surface for the original transport paths 23 and 24, a frame body such as an ADF cover 21 that is provided as an opening / closing member so as to be rotatable with respect to the apparatus main body (ADF main body 20), and an original. The rollers 30, 31... Arranged along the conveyance path 23, and the lock mechanism 50 that locks the ADF cover 21 to the ADF main body 20.

  The ADF cover 21 is pivotally supported by a rotation fulcrum shaft 25 at the rear end of the ADF main body 20, and the rollers 30, 31, etc. are pivoted on the rotation shafts attached to the frames on both sides of the ADF main body 20. It is supported. The document transport path 23 is formed in a substantially “C” shape in front view from the paper feed port 13 to the paper discharge port 14 as a main transport path. The document transport path 24 reverses the front and back surfaces of the document. The document transport path 24 branches the upstream side and the downstream side of the reading unit 3 a in the document transport path 23, and the upstream junction from the downstream branch unit 15. 16 is formed.

  Each of the rollers is classified into four systems. The rollers 30 and 31 separate the originals deposited on the paper supply tray 9 one by one and pass from the paper supply port 13 serving as a document supply port to the document conveyance path 24. As retraction conveyance means, the rollers 33 and 34 perform registration operations and as registration means for correcting skew of the original, and the rollers 35, 36, 37 and 38 as reading conveyance means for conveying the original to the reading unit 3. The rollers 39 and 40 are used as discharge conveying means for discharging the read original from the paper discharge port 14.

  An example of such an arrangement position of the roller 30 and the like will be described. A pickup roller 30 and a separation roller 31 are arranged in the vicinity of the paper feed port 13 to the ADF 2 along the document conveyance path 24, and a registration roller 33 on the downstream side. 34 is disposed, and first feed rollers 35 and 36 are disposed between the registration rollers 33 and 34 and the reading unit 3a of the image reading apparatus 3, and the first feed rollers 35 and 36 are disposed between the reading unit 3a and the branching unit 15. Two feed rollers 37 and 38 are arranged, and discharge rollers 39 and 40 capable of forward and reverse rotation are arranged between the branch portion 15 and the paper discharge port 13 (see the figure). In addition, arrangement | positioning, a structure, etc. of the roller 30 etc. in ADF2 are not limited to this.

Next, the lock mechanism 50 according to the present embodiment will be described in detail below.
As shown in FIGS. 2 to 4, the lock mechanism 50 includes engaging members 51 and 151 provided at one end of an ADF cover 21 that is openable and closable with respect to the ADF main body 20, and the engaging member 51. And a convex receiving portion 52 formed so as to be engageable with each other. The ADF cover 21 is locked and locked to the ADF main body 20 by the engagement members 51 and 151 being locked to the receiving portion 52.

  The engaging member 51 includes an arm portion 54, a contact portion 55, a hook portion 56, and the like. The engaging member 51 is configured to have substantially the same shape although one shape (engaging member 51) is partially different from the other shape (engaging member 151) as described later. Hereinafter, the configuration of the engaging member 51 will be described unless otherwise specified.

  A resin-made shaft 53 is supported by ribs 21a and 21a protruding from the inner side wall along one longitudinal portion of the ADF cover 21 and along the front-rear direction of the ADF main body 20, and the engaging member 51 is connected to the shaft. 53 is continuously provided on the projecting end portions projecting from the ribs 21a and 21a at both ends. Then, when the shaft 53 is rotated, the engaging members 51 and 151 at both ends are formed so as to be able to rotate in cooperation. Note that the shaft 53 and the engaging members 51 and 151 are preferably formed integrally from a resin because they can be easily formed.

  The arm portion 54 extends in a direction orthogonal to the rotation fulcrum shaft 25 of the ADF cover 21, and one end is attached to the shaft 53 (in the present embodiment, it is configured integrally with the shaft 53). The contact portion 55 is formed on the other end side of the arm portion 54 so as to be a slope that is chamfered obliquely in a front view. As will be described later, by providing a slope on the arm portion 54, the arm portion 54 is guided in sliding contact with the receiving portion 52, and the ADF main body 20 and the ADF cover 21 can be easily locked. The hook portion 56 is notched and formed in a substantially U-shape in front view closer to the center portion in the longitudinal direction than the contact portion 55 in the arm portion 54, and an opening portion 56a is opened. The receiving portion 52 protrudes in a convex shape substantially perpendicularly (horizontal direction) to the inner surface of the frame of the ADF main body 20 and is formed so that the hook portion 56 of the engaging member 51 is locked.

  Further, as shown in FIG. 4, a torsion spring 57 for urging the engaging member 51 to return to the locked position is fitted to the fixing pin 58 on one side surface of the arm portion 54. One end 57 a of the torsion spring 57 abuts on an engagement protrusion 59 protruding on the same surface of the arm portion 54, and the other end 57 b is locked to the inner wall of the ADF cover 2 or the ADF main body 20. The engagement member 51 is positioned at a reference position (lock position) A that is engaged with the receiving portion 52 by the biasing force of the torsion spring 57. Specifically, the torsion spring 57 is biased in a direction in which the distance between the one end 57a and the other end 57b is increased, and a part of the engagement member 51 or the shaft 53 comes into contact with the inner wall of the ADF cover 21 or the like. Thus, the arm portion 54 of the engaging member 51 is configured to be substantially perpendicular to the apparatus main body.

  Further, an edge 60 serving as a handshake for the operator to rotate the engaging member 51 is extended at one end of the arm portion 54 in a direction orthogonal to the shaft 53. In the present embodiment, the edge 60 is formed so as to protrude from the operation opening 61 provided on the side wall of the ADF cover 21 to the upper surface of the apparatus main body. By providing the edge portion 60 on the upper surface of the ADF cover 21 as described above, the opening / closing operation of the ADF cover 21 is facilitated. When the edge 60 is gripped and pulled upward, the engaging member 51 can rotate to the unlocked position against the biasing force of the torsion spring 57 with the shaft 53 as the center of rotation. it can. When the gripping of the edge portion 60 is canceled, the engagement member 51 is returned to the reference position A by the torsion spring 57.

Here, the engaging mechanism of the engaging member 51 and the receiving portion 52 will be described below.
As shown in FIG. 5A, when the ADF cover 21 is rotated from the opened state to the closing direction (see FIG. 2), the engaging member provided at the end portion of the ADF cover 21 eventually. 51 comes into contact with the convex receiving portion 52 projecting from the frame of the ADF main body 20 from above (FIG. 5B). First, the contact portion 55 of the engagement member 51 comes into contact with the receiving portion 52, and then the engagement member 51 rotates against the urging force of the torsion spring 57 along the slope shape of the contact portion 55. It is pushed downward while moving. When the receiving part 52 reaches the opening 56a of the hook part 56 (FIG. 5C), the engaging member 51 returns to the reference position A by the biasing force of the torsion spring 57, and the engaging member 51 (hook portion 56) is locked to the receiving portion 52 (FIG. 5D). In such a state, the ADF cover 21 is locked to the ADF main body 20, and the opening / closing operation of the ADF cover 21 is restricted.

  On the other hand, in order to open the ADF cover 21 from the state in which the ADF cover 21 is locked, the edge 60 of the engaging member 51 protruding from the upper surface of the ADF cover 21 is rotated upward as described above. Then, the engagement member 51 is rotated to release the engagement between the engagement member 51 (hook portion 56) and the receiving portion 52 (see FIG. 5C), and the ADF cover 21 is freely rotated. Will be able to. The engagement member 51 returns to the reference position A if the gripping of the edge 60 is canceled in a state where the ADF cover 21 is opened. When the ADF cover 21 is closed, the ADF cover 21 and the ADF main body 20 can be locked only by gently pressing the upper surface of the ADF cover 21 downward.

  As described above, when the ADF cover 21 is closed, the engagement member 51 in the lock mechanism 50 is first positioned at the reference position A by the biasing force of the torsion spring 57, and the contact portion 55 contacts the receiving portion 52. Thus, it is rotated from the reference position A to a position where it can be locked. When the receiving portion 52 reaches the hook portion 56 from the contact portion 55, the receiving portion 52 is automatically returned to the reference position A again by the urging force of the torsion spring 57 and is locked to the receiving portion 52. Further, when the ADF cover 21 is opened, the locking between the engaging member 51 and the receiving portion 52 can be canceled only by the operator holding the edge portion 60 and rotating the engaging member 51 upward.

  With the configuration as described above, the locking mechanism 50 according to the present embodiment only rotates the ADF cover 21 from the opened state to the closed state when locking the ADF cover 21 to the ADF body 20. The engaging member 51 is automatically locked to the receiving portion 52, and the ADF cover 21 can be locked to the ADF main body 20. For example, even when a document jam occurs in the document transport paths 23 and 24 in the ADF 2, the maintenance is facilitated by opening and closing the ADF cover 21 from above the apparatus main body.

In the present embodiment, one engaging member 51 is provided with a positioning mechanism for the engaging member 51 including the torsion spring 57 and the like. However, the present invention is not limited to this. -You may comprise to 151.
Further, the edge portion 60 may be provided not only on one engagement member 51 but also on both engagement members 51 and 151, and may be provided not only on the engagement member 51 but also on the shaft 53. Good.
Further, in the above-described embodiment, the engaging member 51 is provided on the ADF cover 21 side and the receiving portion 52 is provided on the ADF main body 20 side. However, the arrangement of the engaging member 51 and the receiving portion 52 is opposite to this. The joint member 51 may be provided on the ADF main body 20 side, and the receiving portion 52 may be provided on the ADF cover 21 side.
In addition, the opening direction of the hook portion 56 in the engaging member 51 and the biasing direction of the torsion spring 57 are not limited to this.

Next, the engaging members 51 and 151 will be described in detail below.
As shown in FIGS. 6 to 8, the locking mechanism 50 according to this embodiment includes one engaging member 51 and the other engaging member among the engaging members 51 and 151 disposed at both ends of the shaft 53. The hook portions 56 and 156 of 151 have different shapes or sizes. Specifically, the engaging member 51 is opened such that the opening 56 a of the hook portion 56 is wider than the opening 156 a of the hook portion 156 of the engaging member 151. An opening 56a of one engagement member 51 is formed wide, and one engagement member 51 is configured to be easily engaged with the receiving portion 52 to prevent one lock in the lock mechanism 50. is there.

First, examples of the engaging members 51 and 151 will be described in order below. However, this embodiment is not limited to this.
In the engaging members 51 and 151 shown in FIG. 6, the hook portion 56 of the engaging member 51 has an edge portion 56b on the side continuous with the contact portion 55 (the lower side portion 56d of the opening portion 56a) having a substantially R shape in front view. (Fig. 6 (a)). On the other hand, the hook portion 156 of the engagement member 151 is formed so that the edge portion 156b is substantially perpendicular (FIG. 6B). The shape and size of the hook portion 56 of the engaging member 51 and the hook portion 156 of the engaging member 151 are substantially the same except for the shapes of the edge portions 56b and 156b. When the widths of the hook portions 56 and 156 are expressed by lengths L1 and L2 from the upper side portions 56c and 156c to the edge portions 56b and 156b, respectively, the length L1 of the hook portion 56 in the engaging member 51 is greater. The engagement member 151 is formed to be longer than the length L2 of the hook portion 156 (L1> L2).
In addition, the shape of the edge 60 of the engaging member 51 in the present embodiment may be formed so as to be chamfered obliquely as well as having a R shape in front view.

  In addition, the engaging members 51 and 151 shown in FIG. 7 are formed by notching the hook portion 56 of one engaging member 51 larger than the hook portion 156 of the other engaging member 151. Specifically, the upper side portion 56c of the hook portion 56 in the engaging member 51 and the upper side portion 156c of the hook portion 156 in the engaging member 151 are located on substantially the same plane, and the lower side portion 56d of the hook portion 56 is The horizontal position is formed to be positioned below the horizontal position of the lower side portion 156d of the hook portion 156 (FIGS. 7A and 7B). When the width of the hook portions 56 and 156 is represented by the lengths L1 and L2 from the upper side portions 56c and 156c to the lower side portions 56d and 156d (edge portions 56b and 156b), The length L1 is formed to be larger than the length L2 of the hook portion 156 in the engaging member 151 (L1> L2).

  Further, the engaging members 51 and 151 shown in FIG. 8 are formed by inclining the hook portion 56 of one engaging member 51 downward toward the edge portion 56b so that the lower side portion 56d is substantially tapered in plan view. And is formed by cutting out larger than the hook portion 156 of the other engagement member 151 (FIGS. 8A and 8B). When the widths of the hook portions 56 and 156 are expressed by the lengths L1 and L2 from the upper side portions 56c and 156c to the edge portions 56b and 156b, the length L1 of the hook portion 56 in the engaging member 51 is greater. It is formed so as to be larger than the length L2 of the hook portion 156 in the combined member 151 (L1> L2).

  As described above, the engaging members 51 and 151 have the length L1 of the hook portion 56 of one engaging member 51 larger than the length L2 of the hook portion 156 of the other engaging member 151, that is, one engaging member. The hook portion 56 of the member 51 is configured to open wider than the hook portion 156 of the other engagement member 151.

  As described above, the hook portion 56 of one engagement member 51 is opened wider than the other by making the edge portion 56b substantially R-shaped in plan view or positioned below the other edge portion 156b, etc. The portion 56 can be easily locked with the receiving portion 52 and can be locked earlier than the other hook portion 156 is locked with the receiving portion 52. Therefore, one of the engaging members 51 and 151 disposed at both ends of the shaft 53 can be easily locked to the receiving portion 52, and the operator or the like can engage the other engaging member 151. It is possible to easily prevent the one-side lock in the lock mechanism 50 simply by engaging with the receiving portion 52 while checking the above. In particular, even when the resin shaft 53 is used, even when the shaft 53 is bent or distorted, the engaging members 51 and 151 can be reliably and easily locked to the receiving portion 52. In addition, since the single lock can be prevented, it is possible to eliminate the adverse effects caused by forming the shaft 53 with resin or the like in order to reduce the manufacturing cost.

  Returning to FIG. 2, the engaging members 51 and 151 are engaged with the receiving portion 52 in the vicinity of the engaging members 51 and 151 or the receiving portion 52 of either the ADF main body 20 or the ADF cover 21. An open / close sensor 70 is provided for detecting whether or not it is stopped. In the present embodiment, the open / close sensor 70 is provided on the ADF main body 20 side in the vicinity of the receiving portion 52 because the ADF cover 21 is provided with the engaging members 51 and 151 and the receiving portion 52 on the ADF main body 20. Has been placed.

  The open / close sensor 70 is connected to a control unit (not shown), and controls the multi-function control unit 1 to disable the document reading operation of the multifunction machine 1 based on information detected by the open / close sensor 70. As the open / close sensor 70, various sensors such as a contact sensor (a limit switch, an on / off sensor, a touch sensor, etc.) and an optical sensor can be used. In this embodiment, a mechanical contact sensor having a pin-type actuator is used (see FIG. 2). The open / close sensor 70 is disposed immediately below the receiving portion 52 on the ADF main body 20 side and at a position where the tip of the engaging member 51 (151) can contact. The opening / closing sensor 70 has a pin 70a that can be pivoted up and down, and the pin 70a is located at the tip of the engaging member 51/151 when the engaging member 51/151 is engaged with the receiving portion 52. It is pressed downward and energized.

  When it is detected by the opening / closing sensor 70 that the engaging member 51 (151) is locked to the receiving portion 52, based on such information, the control portion disables the document reading operation, The multifunction device 1 is controlled by displaying on a panel or the like. By providing the opening / closing sensor 70 in this way, the operator can confirm that the engaging member 51 (151) is not locked to the receiving portion 52, and the document to the ADF 2 is opened when the ADF cover 21 is opened. Is prohibited to prevent document jamming.

  Here, in the present embodiment, one open / close sensor 70 is disposed in the vicinity of the receiving portion 52 disposed in one of the frames of the ADF body 20. Then, on the side where the open / close sensor 70 is provided and on the opposite side (the side where the open / close sensor 70 is not provided), the open / close sensor 70 is more than the hook portion 156 of the engaging member 151 on the side where the open / close sensor 70 is provided. The hook portion 56 of the engaging member 51 on the side where no boss is provided is configured to open wide.

  Here, as described above, the embodiment in which the hook portions 56 and 156 are made different in size and shape by the engaging members 51 and 151 and the one hook portion is opened widely is as described above. (See FIGS. 6 to 8).

  By configuring in this way, the engaging member 51 with the hook part 56 having a large opening is easily locked to the receiving part 52, and the other engaging member 151 is locked to the receiving part 52. First, the receiving portion 52 is locked. On the other hand, the opening / closing sensor 70 is provided in the receiving portion 52 to which the other engaging member 151 is locked, and whether the engaging member 151 is locked to the receiving portion 52 is determined by the opening / closing sensor 70. Detected. That is, when the opening / closing sensor 70 detects that the engaging member 151 is locked to the receiving portion 52, both the engaging members 51 and 151 are locked to the receiving portion 52. When the ADF cover 21 is closed and the open / close sensor 70 detects that the engaging member 151 is not locked to the receiving portion 52, the engaging member 151 and the receiving portion 52 are locked. It will not be.

  As described above, the hook portion 56 of the engaging member 51 disposed on the opposite side is wider than the hook portion 156 of the engaging member 151 disposed on the side where the open / close sensor 70 is provided. By forming so as to open, the engagement member 151 provided on the side where the opening / closing sensor 70 is provided is locked to the receiving portion 52 after the locking member 51, and the opening / closing sensor 70 is provided. The locking state of the ADF cover 21 can be confirmed simply by detecting whether or not the engagement member 151 on the side is locked, and the ADF cover 21 is securely locked to the ADF body 20 by reliably preventing one-side lock. be able to.

  In the lock mechanism 50 configured as described above, the hook portions 56 and 156 of the engaging members 51 and 151 are in contact with the receiving portion 52 in a state where the engaging members 51 and 151 are locked to the receiving portion 52. It is preferable that the lower side portions 56d and 156d to be surfaces are formed so as to be located on substantially the same plane.

  That is, the ADF cover 21 serving as an opening / closing body in which the engaging members 51 and 151 are disposed is urged upward by an elastic body (not shown) when locked to the ADF main body 20. By biasing the ADF cover 21 in this way, the opening / closing operation is easy. Therefore, when the hook portions 56 and 156 are locked to the receiving portion 52, the engaging members 51 and 151 are urged upward, and the receiving portions 52 are placed on the lower side portions 56d and 156d of the hook portions 56 and 156. Abut. Therefore, the hook portions 56 and 156 are formed so that the lower side portions 56d and 156d are located on substantially the same plane, so that the both engaging members 51 and 151 and the shaft 53 are received substantially horizontally with respect to the apparatus main body. The ADF cover 21 can be locked to the ADF main body 20 by preventing the rattling of the ADF cover 21 without tilting or deviating in the width direction. it can.

FIG. 2 is a perspective view of a multifunction machine including a lock mechanism according to the present invention. The front view which showed the internal structure of ADF. The perspective view which showed the arrangement structure of an engaging member and a shaft. The front view of an engaging member. The state figure which showed a mode that the engagement member latched to the receiving part. The front view of the engaging member which compared the shape etc. of the hook part. The front view of the engaging member which shows another example similarly. The front view of the engaging member which shows another example similarly.

Explanation of symbols

20 ADF main unit (device main unit)
21 ADF cover (opening / closing body)
50 Locking mechanism 51, 151 Engaging member 52 Receiving part 54 Arm part 55 Contact part 56, 156 Hook part 56a, 156a Opening part 56b, 156b Edge part 56c, 156c Upper side part 56d, 156d Lower side part

Claims (3)

Formed on one end of an apparatus body and an opening / closing body provided on the apparatus body so as to be openable and closable, and an engagement member that can be rotated in cooperation with both sides of the shaft, and can be engaged with the engagement member A locking mechanism that locks the opening / closing body to the apparatus main body by locking the engagement member to the reception portion from above , wherein the engagement member includes: an arm portion connected to the shaft, makes it a lockable hook portion to the receiving portion is cutout formed in a front view substantially U-shaped in the upper part from the distal end of the arm portion, the provided one of the hooks A locking mechanism , wherein a horizontal position of a lower side portion of the first hook portion is formed to be positioned below a horizontal position of a lower side portion of the other hook portion . Formed on one end of an apparatus body and an opening / closing body provided on the apparatus body so as to be openable and closable, and an engagement member that can be rotated in cooperation with both sides of the shaft, and can be engaged with the engagement member A locking mechanism that locks the opening / closing body to the apparatus main body by locking the engagement member to the reception portion from above , wherein the engagement member includes: an arm portion connected to the shaft, makes it a lockable hook portion to the receiving portion is cutout formed in a front view substantially U-shaped in the upper part from the distal end of the arm portion, the provided both the hook The horizontal position of the lower side portion of the hook portion is formed at substantially the same height, and the edge portion of the lower side portion of one of the hook portions is formed to have a substantially R shape or a chamfered shape when viewed from the front, and the other hook portion A locking mechanism, characterized in that the lower side edge is formed at a substantially right angle . Formed on one end of an apparatus body and an opening / closing body provided on the apparatus body so as to be openable and closable, and an engagement member that can be rotated in cooperation with both sides of the shaft, and can be engaged with the engagement member A locking mechanism that locks the opening / closing body to the apparatus main body by locking the engagement member to the reception portion from above , wherein the engagement member includes: an arm portion connected to the shaft, makes it a lockable hook portion to the receiving portion is cutout formed in a front view substantially U-shaped in the upper part from the distal end of the arm portion, the provided one of the hooks A locking mechanism , wherein a lower side portion of the hook portion is formed to be inclined downward from a horizontal position of a lower side portion of the other hook portion toward an edge portion in a substantially tapered shape in plan view .

Images