JP2000109238A - Paper sheet feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a space-saving, low-cost lock mechanism. SOLUTION: The lock section of opening/closing mechanisms used as countermeasures against jams inside paper sheet carrying sectinos is so constructed that a left lock arm 69 and a right lock arm 70 are coupled via a rod 71 of a diameter of about 4 mm, with their center of rotation being aligned with the center axis of the rod 71. Both ends of the rod 71 are bent and seated in grooves cut in the respective left and right lock arms 69 and 70 to connect them together with no play and with sufficient strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a sheet conveying apparatus such as a facsimile.

[0002]

2. Description of the Related Art A conventional example will be described with reference to FIG. Usually, a sheet conveying device used for facsimile or the like includes an upper document guide 101, a lower document guide 102 forming a document conveyance path, a separation roller 103 for separating and conveying a plurality of documents, and a separation unit including a separation piece 104. And a transport roller 105 for transporting the original to the image forming apparatus 107
And a transport roller 106, and a discharge roller 10 for discharging a document read by the image forming apparatus 107 to the outside of the apparatus.
8. It is composed of a paper discharge roller 109. The upper guide 1
Reference numeral 01 is pivotally supported so as to be openable and closable with respect to the lower document guide 102. By opening and closing the upper document guide 101, a document jam can be cleared.

Next, a lock mechanism when the upper document guide is closed will be described with reference to FIG. The lock mechanism includes a pair of lock arms 111 and 112 rotatably mounted on both sides of the upper document guide 101 and a lock arm shaft 113 and a drive board 114 for connecting and rotating the pair of lock arms in synchronization with each other. It is composed of a projection 116 attached to the side plate 115. The lock arm shaft 113 is formed by bending a sheet metal into a U-shape, and has both ends screwed to the lock arm.

[0004]

However, in the prior art, since the connecting shaft connecting the lock arms is formed of a sheet metal bent in a U-shape, the cross-sectional area occupied in the apparatus is large.
In addition, since the center of the connection shaft and the rotation center of the lock arm are configured at different positions, the lock arm shaft moves on the locus about the rotation center of the lock arm when releasing the lock. However, there is a problem that a large space is required and the device becomes large.

It is an object of a first invention according to the present application to provide a sheet conveying device having a lock mechanism which can be configured in a small space.

[0006]

In order to achieve the first object, the invention according to the present application is directed to an upper guide and a lower guide forming a transport path, and a pair of locks rotatably mounted on the upper guide. A member, a connecting shaft made of a rod material having both ends bent to connect the lock member, and a projection attached to a member on the lower guide side, and the upper guide is pivotally supported on the lower guide so as to be openable and closable, In a device that locks the upper guide to the lower guide by engaging the projection with the engaging portion formed on the lock member, the connecting shaft is formed of a rod having a circular cross section,
The bent portions at both ends of the connection shaft are clamped in grooves formed near the rotation center of the lock member, and the center of the connection shaft and the rotation center of the lock member are aligned.

[0007] According to the above configuration, a pair of lock members are connected by a round bar-shaped shaft having a U-shape with both ends bent, and the center of the shaft and the rotation center of the lock member are made to coincide with each other, so that the required torsional torque is increased. And a sheet conveying apparatus having a space-saving and low-cost lock mechanism.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A facsimile apparatus having a detachable reading unit, which is an example of a sheet conveying apparatus according to the present invention, will be described with reference to FIG.

This apparatus is laid out from the top of four parts: an operation unit A, a reading unit B, a recording unit C, and an electric unit D from above.

An operation unit A is provided with keys for operating each function of the facsimile and an LCD for notifying the user of the state of the apparatus.
21 and a panel cover 2 in which LED windows are arranged
2, screwed inside the panel cover 22;
Operation board 23 on which electric parts such as LCD and LED are mounted
And a rubber key. The rubber key is disposed below the key between the panel cover 22 and the operation board 23, and is printed on the carbon pattern of the operation board 23 and the back side of the rubber key by a user pressing the key. ON / O by the contact of the carbon contacts
FF is detected. The panel cover is attached to an upper document guide described later.

The configuration of the recording section C will be described in detail.
First, the flow of the recording paper P will be described. The recording paper transport path is as shown by arrow G. That is, the recording paper P loaded on the loading tray 1 and the pressure plate 2 of the recording paper feeding unit is picked up by the feeding roller 3 and sent to the recording unit by the pair of paper feeding rollers 4a and 4b. In the recording section, recording is performed by an ink jet head 5a as recording means, and after a certain distance is conveyed in the apparatus, a pair of discharge rollers 6a and 6b and a pair of discharge rollers 7 as discharge means.
The sheets are discharged and loaded by a and 7b.

Next, a specific configuration of the recording paper feeding section and the recording section will be described.

First, the recording paper feeding section will be described. FIG.
, 1 and 2 are a loading tray and a pressure plate on which a plurality of recording sheets P are loaded. The loading tray 1 also plays a role of loading a document S described later. The pressure plate 2 is urged upward by a feed roller 3 and a pressure plate spring 18 disposed on both sides of the pressure plate 2 in the paper width direction. Press plate 2
Has a structure in which the recording paper P is pressed downward by a cam (not shown) or the like during the paper supply standby state, and the recording paper P can be easily replenished when the recording paper P is reduced or disappears.

On the other hand, when the recording signal is detected and the paper feeding operation is started, the downward pressing of the pressure plate 2 by a cam or the like (not shown) is released, and the recording paper P is picked up by the paper feeding roller 3. Numeral 8 denotes a bank sheet which is an elastic body. The picked-up recording paper P deflects the bank sheet 8 and separates the bank sheet 8 one by one from the top side by the action of the resistance.
The separated and fed recording paper P is detected by 9 paper edge sensors, and is conveyed to the pair of paper feeding rollers 4a and 4b, and further conveyed to the recording unit by the pair of paper feeding rollers 4a and 4b.

Next, a specific configuration of the recording section C will be described with reference to FIG.
This will be described with reference to FIG. In FIG. 2, the inkjet recording means of this embodiment includes an inkjet head 5a.
And the ink tank 5b are integrally provided so as to be separable, and a cartridge type in which only the ink jet head 5a or only the ink tank 5b can be replaced as necessary.

However, this is merely an example, and the ink jet recording means of the present invention has a built-in ink tank and an ink jet head so that each ink jet recording head can be replaced with a new one when the ink runs out. Is also good.

Inkjet head 5 used in this embodiment
a can be a monochrome inkjet head or a color inkjet head, both of which can be replaced as appropriate. For example, a monochrome inkjet head has a resolution of 360 dpi and a resolution of 12 dpi.
It has a nozzle row in which eight nozzles (discharge ports) are arranged in one row, and discharges ink from the discharge port at the tip of the nozzle by the pressure of the film boiling generated in the ink by the heat generated by the electrothermal conversion element provided in the nozzle. Is what you do.

On the other hand, the color ink jet head is provided with a black portion nozzle and a color portion nozzle separately. The black portion head has 64 nozzles, and the color portion head has cyan, magenta and yellow nozzles. Each of the three colors has 24 nozzles, and the nozzles are arranged in one row. The ink jet head dedicated to color can have a structure in which two ink tanks can be exchanged for black ink and color ink.

Reference numeral 10 denotes a unit for reciprocating the recording paper P in the main scanning direction (arrow H direction) in a direction orthogonal to the transport direction (sub-scanning direction, arrow G direction) while holding the ink jet head 5a with high precision. The carriage is slidably held by a guide rod 11 and an abutting portion 10a. The reciprocating movement of the carriage 10 is performed by a pulley 12 and a timing belt 13 driven by a carriage motor (not shown). At this time, a recording signal and electric power to be applied to the inkjet head 5 are transmitted from an electric circuit of the apparatus main body by a flexible cable 14. Supplied.

Reference numeral 15 denotes a cap which functions as an ink receiving means. The cap 10 is arranged corresponding to a predetermined standby position (home position), moves up and down as needed, and moves up and down as needed. To prevent evaporation of ink and adhesion of dust.

In this embodiment, in order to position the ink jet head 5 and the cap 15 so as to be relatively opposed to each other, a carriage home sensor 16 provided on the apparatus main body and a light shielding provided on the carriage 10 are provided. A plate 10b is used. As the carriage home position sensor 16, a transmission type photo interrupter is used, and when the carriage 10 moves to the standby position, light emitted from a part of the carriage home sensor 16 is blocked by the light shielding plate 10b. Utilizing this, the inkjet head 5 and the cap 15
Are detected as being relatively opposed to each other. Thus, the carriage 10 can be moved and set at a predetermined standby position.

The recording paper P is conveyed in a direction parallel to the ink jet head 5a by a pair of paper feed rollers 4a and 4b.
The sheet is conveyed in the direction of arrow G (sub-scanning direction). Paper feed roller 4
a and the paper discharge rollers 6a and 7a are driven by motors (not shown), respectively.
The recording paper P is conveyed in the sub-scanning direction with high precision in conjunction with the reciprocation of the recording paper P. Reference numerals 6b and 7b denote spurs, which are made of a highly water-repellent material and come into contact with the recording paper P only at the recording paper surface and at the edge-shaped circumferential portion. The spurs 6b, 7b are connected to the discharge rollers 6a,
At a position opposing the fixing member 7a, a plurality of portions are arranged at predetermined intervals in the main scanning direction by a bearing member (not shown) in a main scanning direction. The recording paper P is guided and transported.

The transmission section D will be described. The transmission section D is disposed below the recording section C and is partitioned by the frame 24 so that even if the ink of the conductive recording section overflows due to a worst case, the transmission section D does not go to the transmission section. The transmission unit includes a control board 25 for controlling functions such as copying, facsimile communication, and telephone, a power supply 26 for supplying electricity to the control board and each device, and a cordless board for controlling an attached cordless handset phone. 27,
It is composed of the control board and a bottom plate 28 made of sheet metal to which a power supply is attached.

The reading section B will be described. Reading unit B
Is composed of a sheet transport section E disposed on the recording section and an image forming section F disposed on a recording paper discharge path. The original S is directed from the rear of the apparatus toward the front of the apparatus over the recording section. It is configured to be transported.

The image forming unit F includes a white reference 31 and a hand scanner 32 attached to an upper document guide 29 described later.
And the following two usage modes are made possible by making the hand scanner detachable from the main body. One is sheet reading with the hand scanner 32 attached to the main body. The other is a hand scanner 32
Is a hand scanner reading for reading an image by removing the image and tracing the medium by himself / herself. Sheet reading is effective when reading a plurality of cut sheet originals or reading that requires precision, and hand scanner reading is effective for reading a medium that cannot be conveyed by a sheet conveying device, such as reading a magazine.

The hand scanner 32 discharges a document outside the apparatus by holding it with a color contact sensor 33 for reading an image from a medium and a discharge roller to be described later for reading a sheet. A discharge roller 34 for improving the straightness by manually pressing and manually moving the hand scanner; a control board 35 for storing image data read by the color contact sensor in a memory after conversion and compression processing; An encoder including a photo-interrupter 37 and an actuator (not shown) connected to the color contact sensor, a battery 36 for supplying power to the control board, and a movement amount of the hand scanner from the rotation angle of the discharge roller connected to the discharge roller. It comprises a cover 38 for storing parts.

The sheet transport section E is mounted on the document passing surface so as to be movable in the paper width direction. The slider 39 controls the setting position of a document of an arbitrary paper width size and suppresses skew. An upper document guide 29 which forms a guide on the upper side of the road and serves as a support member for each member described later.
And a lower document guide 40 attached to the upper document guide to form a lower guide of the medium conveyance path, a separation unit for separating and conveying the set media one by one, and a document holding and reading position. And a discharge roller 43 for discharging the sheet medium out of the main body. The separating section includes a separating roller 44 rotatably supported by the upper document guide 29 via a bearing, a separating piece holder 45 mounted on the upper document guide 29, and a separating piece 46 mounted on the separating piece holder. ,
The separation piece 46 is separated from the separation roller 44 via the separation piece holder 45.
Urged by a spring 47. The transport roller 42 is rotatably mounted on a shaft supported by a rib formed on the upper document guide 29 so as to be movable in the vertical direction. The shaft is located on the upper document guide 2.
The transport roller 42 is pressed against the transport roller 41 by being urged in the K direction by a roller pressing spring 48 screwed to the roller 9. The transport roller is attached via a bearing to a drive board (not shown) and a side plate attached outside the document transport path on the frame. Paper discharge roller 43
Is pressed against the paper discharge roller 34 by the roller pressing spring 48 via a cylindrical paper discharge roller bearing 49 passed through a shaft. The discharge roller bearing 49 is supported so as to be vertically movable by being sandwiched between ribs (not shown) of the upper document guide 29.

Next, the sheet reading operation will be described. First, along the slider 39 set to the width of the document, the leading edge of the document is set on a wedge 50 formed by the separation roller 44 and the separation piece 46. In addition, in the original setting state, the original presence sensor 51 and the original width sensor 52 are turned ON, and the apparatus enters a reading standby state. When a reading start signal is sent by a user operation, the separation roller 44 and the transport roller 4
1. The discharge roller 43 starts rotating by a motor (not shown). Then, the originals are separated one by one by the separation unit and sent to the transport roller 41, and the original end detection sensor arranged downstream of the transport roller 41 is turned on. Further, the conveyed document is pressed against the surface of the contact sensor 33 by its own weight of the white reference 31 formed of a sheet metal and a white paper-like member, is sent to the paper discharge roller 43 while reading the image data, and is discharged out of the apparatus.

The drive transmission from the transport roller to the separation roller has a structure in which the transport roller and the separation roller separate as shown in FIG. 5 when the upper document guide 29 is opened.
The power is transmitted by a pendulum, which will be described later, in order to increase the accuracy of the meshing of the gears divided into two in the drive transmission path.
In the following, a second transport roller gear 59 is mounted outside the first transport roller gear so as to rotate integrally with the shaft 41a.
3 and the second transport roller gear 59, the pendulum arm 6
0 is rotatably mounted. The pendulum arm 60
A shaft 60a is integrally formed on the shaft. A pendulum gear 61 is rotatably mounted on the shaft so as to mesh with the second transport roller gear 59. The pendulum arm 60 and the pendulum gear 61 are connected to the second transport roller gear 59. It is configured to be able to rotate around the transport roller gear while meshing with the gear. On the other hand, the separation roller 44 includes a metal shaft 44a and a rubber portion 44b, and the rubber 44b is pressed into the shaft 44a and rotates integrally with the shaft. A separation roller gear 62 is rotatably attached to the shaft 44a. A projection 62a is provided on one end surface of the separation roller gear 62. 53 is a mechanical timer,
It is made up of a disk and a projection 63a extending radially from the disk, and is mounted so as to rotate integrally with the shaft 44a. The projection 62a and the projection 63a are configured to be at the same position in the radial direction and the width direction.

With this configuration, when the separation roller 44 and the separation roller gear 61 are rotated, a play θ at a certain angle
There is to be. The pendulum gear 61 and the separation roller gear 62 allow the deviation by moving the pendulum gear even if the position of the separation roller is shifted due to the lock state of the upper document guide or an error in each dimension when the upper document guide is closed. In addition, proper shafts are engaged with each other. When the transport roller further rotates in the paper feed direction, the second transport roller gear, pendulum gear, and separation roller gear rotate in the direction of arrow L, and a force is applied to each axis in the direction indicated by the pressure angle. Then, the pendulum arm, which is the axis of the pendulum gear, moves in the direction M that bites into each gear, and the drive can be transmitted from the transport roller 41 to the separation roller 44 without the gear escaping. The positions of the pendulum gear 61 and the separation roller gear 62 are determined by bringing the flanges 61b and 62b of the respective gears into contact with each other in order to prevent the shafts from coming too close to each other and increasing the load.

Next, the drive from the separation roller 44 to the paper discharge roller 43 will be described. A discharge roller joint shaft 64 is attached to one end of the shaft of the discharge roller 43 so as to rotate integrally with the shaft, and a discharge roller gear 65 is integrally formed at the opposite end of the discharge roller joint shaft 64. The paper discharge roller gear 65 is rotatably supported by the upper document guide 29. Further, the outer diameter of a part of the discharge roller joint shaft 65 is smaller than that of the other part, so that even when the position of the discharge roller 43 moves in the vertical direction, the constricted part 66 absorbs the deviation of the axial center and reduces the load. The drive of the paper discharge roller gear can be transmitted to the paper discharge roller without increasing. The drive from the separation roller 44 to the paper discharge roller 43 is transmitted by four transmission gears 67 rotatably attached to the side surface of the upper document guide 29. Here, the transport roller 4
The gear module from 1 to the separation roller 44 is made larger than the module from the motor to the transport roller in order to eliminate transmission errors due to the pendulum. In this embodiment, the module from the motor 55 to the transport roller 41 is 0.5,
The module from the transport roller 41 to the paper discharge roller 43 is set to 0.8. In this manner, the portion from the pinion gear 58 of the motor to the transport roller gear 53 is supported by the drive substrate 54, and the portion from the separation roller 44 to the paper discharge roller 43 downstream thereof is supported by the upper document guide 29, that is, the broken line N
By managing the distance between the axes of each gear of the transmission path divided into two by the shape of one member, errors in the distance between the axes are minimized, and high transmission efficiency and high transmission accuracy between each path are possible. I have to. Further, by connecting each of the two high-efficiency and high-precision transmission paths with a pendulum gear 61, the drive substrate 5
4. Absorbing the error of the relative position of the upper document guide 29 to the maximum, and enabling the highest performance drive transmission system.

The apparatus according to the present embodiment cancels the original path so that the original path is divided into upper and lower parts as shown in FIG.
2, the cleaning of the surface of the contact sensor 33 and each roller, the ink jet head 5a, the ink tank 5b
The exchange is possible. Specifically, the operation unit A
And the upper document guide 29 can be integrally opened and closed in the R direction. FIG. 7 is a diagram showing an opened state. With the above-described configuration of the sheet conveying section E, the lower document guide 40 and the separation roller 44 disposed above the recording section can be opened upward together with the upper document guide 29, so that the user can access the recording section C. The recording paper P is jammed, and the ink jet head 5a and the ink tank 5b can be replaced. There are two cases of document jam processing. One is when the document S as shown in the figure is jammed between the separation piece 46 and the separation roller 44, and the other is when the document rear end is separated. This is the case where the jam has occurred after crossing the department. In the former case, when the upper document guide 29 is opened, the separation roller 44 and the separation
Since the original S is lifted while being sandwiched between the originals 6, the original is pulled out forward or backward to perform the jam processing. At this time,
As described above, since the drive transmission downstream from the separation roller 44 is disconnected from the motor by opening and closing the upper document guide 29 (FIG. 5), there is no load due to the detent torque of the motor 55, and the separation roller 44 can rotate without load. It is possible to pull out easily torn paper such as thin paper without damage.
In the latter case, since the transport roller 41 and the transport roller 42 and the paper discharge roller 43 and the paper discharge roller 34 are released by opening and closing the upper document guide 29, the jammed document can be easily removed.

Next, the opening / closing mechanism will be described with reference to FIG. 5. An oval-shaped groove 29b formed at the tip 29a of the arm extending from the upper document guide 29 so that the document passing direction is elongated, and formed at the frame. The upper document guide is rotatably supported with a play in the document conveyance direction T by engaging a projection (not shown). Also,
When the upper document guide 29 is closed, the U-shaped groove 29c formed in the upper document guide 29 and the shaft 4
The position of the upper document guide in the T direction is managed by engaging the first document guide 1a. In this way, the parallelism between the transport roller 41 and the upper document guide 29 can be directly managed, and the disadvantage of supporting the transport roller 41 and the separation roller 44 on separate members can be compensated for. The skew is prevented by eliminating the deviation.

Next, the lock mechanism when the upper document guide 29 is closed will be described with reference to FIG. The locking mechanism is
A pair of lock arms 69, 70 rotatably attached to both sides of the upper document guide 29, and a lock arm shaft 71, a drive board 54, and a lock arm shaft 71 for connecting the pair of lock arms 69, 70 to rotate synchronously. It consists of a projection 73 attached to the plate 72. The lock arm 6
Reference numerals 9 and 70 denote a shaft portion 76 formed on the lock arm between a U-shaped groove 74 formed in the upper document guide 29 and a reinforcing plate 75 attached to increase the strength in the width direction of the upper document guide. And is rotatably supported. One of the lock arms is always urged by a spring in the direction of arrow W (FIG. 8) to a stopper 77 formed on the upper document guide. A release lever 78 for manually rotating the lock arm is integrally formed with the lock arm on the side urged by the spring, and in combination with the operation unit, a notch formed on a side surface of the panel cover. It can be accessed from. The lock arm shaft 71 is formed by bending a metal bar into a U-shape, and bending portions 79 at both ends are formed by grooves 8 formed in the lock arm.
0, and the center of the shaft of the lock arm shaft connecting the two lock arms and the center of rotation of the lock arm coincide with each other.

As described above, by using the rod material for the lock arm shaft and disposing the lock arm shaft at the center of rotation of the lock arm, the space occupied in the apparatus can be minimized and the maximum strength can be obtained. it can. Because, when the second moment of area of the U-shaped sheet metal and the bar in the conventional example is calculated, the torsion strength per cross-sectional area occupied in the apparatus is larger for the bar, and if the strength is the same, the cross-sectional area can be smaller, and This is because, even if the lock arm is rotated by matching the rotation centers, the lock arm axis simply rotates and the occupied area does not change. Further, since the bar does not require a molding die, there is an advantage that the cost is very low. Since the lock arm shaft is present in the entire width direction of the device body, it is better to have a small occupied cross-section area. It is valid. Regarding the mounting of the lock arm and the lock arm shaft, in the case of press-fitting or D-cut locking used for mounting the gear and shaft, the shaft is too thin, so the torsional strength is weak and the backlash increases, and the left and right locks Synchronous rotation of the arm pair is not possible, and there is a possibility that poor opening and closing may occur. Therefore, both ends of the shaft are bent to receive a torsional force in the entire bent portion, thereby increasing the torque of the lock arm pair. The lock arms 69, 70 are formed with claws 81 to be hooked on the protrusions 73, so that the upper document guide 29 is closed and pushed into the frame by a few millimeters so as to be locked with the frame. By doing so, the transport rollers 42 and the paper discharge rollers 43
Is pressed against the transport roller 41 and the paper discharge roller 34, and the document is transported by the spring force of the roller pressing spring 48. The lock is released by rotating the lock arm in the X direction with the release lever 78.

[0036]

As described above, according to the invention of the present application, a pair of lock members are connected by a U-shaped rod-shaped shaft whose both ends are bent, and the center of the shaft coincides with the rotation center of the lock member. By doing so, it is possible to provide a sheet conveying apparatus having a required torsional torque, a space-saving and low-cost lock mechanism.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a recording unit of the facsimile apparatus according to the embodiment of the present invention.

FIG. 3 is a plan sectional view schematically showing a transmission path of a reading drive system of the facsimile apparatus according to the embodiment of the present invention.

FIG. 4 is a side view illustrating a part of a reading drive system of the facsimile apparatus according to the embodiment of the present invention.

FIG. 5 is a side view showing a part of a reading drive system of the facsimile apparatus according to the embodiment of the present invention.

FIG. 6 is a side view showing a part of a reading drive system of the facsimile apparatus according to the embodiment of the present invention.

FIG. 7 is a sectional view when the operation unit of the facsimile apparatus according to the embodiment of the present invention is opened and closed.

FIG. 8 is a perspective view illustrating a lock unit of an operation unit of the facsimile apparatus according to the embodiment of the present invention.

FIG. 9 is a sectional view of the embodiment.

FIG. 10 is a perspective view illustrating a lock unit according to the embodiment.

[Explanation of symbols]

 29 Upper Document Guide 32 Hand Scanner 34 Discharge Roller 40 Lower Document Guide 41 Conveyance Roller 42 Conveyance Roller 43 Discharge Roller 44 Separation Roller 46 Separation Piece 69, 70 Lock Arm 71 Lock Arm Shaft

Claims (1)

[Claims] An upper guide and a lower guide forming a transport path, a pair of lock members rotatably attached to the upper guide, and a connecting shaft formed of a bar having both ends bent to connect the lock members; A projection attached to a member on the lower guide side, the upper guide being pivotally supported on the lower guide so as to be openable and closable, and the upper guide being engaged by engaging the projection with an engagement portion formed on the lock member. In the device for locking to the lower guide, the connecting shaft is formed of a rod having a circular cross section, and the bent portions at both ends of the connecting shaft are inserted into grooves formed near the rotation center of the lock member. A sheet conveying device provided with a lock mechanism, wherein the center and the rotation center of the lock member are matched.