JP2021031285A - Document transport status determination device and image reading device - Google Patents

Abstract

To make it possible to determine the presence or absence of a document at one of two locations along a document transport path and a state of the passage of the document at the other location with a small number of components.SOLUTION: A first rotator 4 has a first prime mover arm 42 and a first driven arm 43 that intersect with a transport path 150 at a first document position P1. A second rotator 5 has a second prime arm 52 and a second driven arm 53 that intersect with the transport path 150 at a second document position P2. A first detected portion 430 of the first driven arm 43 is displaced from a first base point where at least a part of it is located inside a detection area 300 of an object detection sensor 30 to a first end point where the whole of it is located outside the detection area 300. A second detected portion 530 of the second driven arm 53 is displaced from a second base point to a second end point through the detection area 300. A signal determination device 8d determines a normal passage state or a jam state according to a change pattern of the detection signal.SELECTED DRAWING: Figure 3

Description

The present invention relates to a document transport state determining device for determining the state of a document transport path and an image reading device including the same.

The image reader may include an automatic document carrier. The automatic document transporter transports documents along a transport path from the document tray to the ejection tray.

Further, in the recording sheet conveying device in the image forming apparatus, the tip of the recording sheet has passed both the first position and the second position on the downstream side in the sheet conveying direction from the first position, and after the recording sheet. It may include a sensor that detects that the end has passed the first position.

For example, the two detection members move from the non-detection position to the detection position by contacting the tip of the sheet at the first position and the second position, respectively, and one of the sensors is a member of the two detection members. It is known to distinguish between a state in which both have moved to the detection position and a state in which at least one of the two detection units remains in the non-detection position (see, for example, Patent Document 1). ..

Japanese Unexamined Patent Publication No. 2015-145286

By the way, in the image reading device, there is a case where it is desired to determine the presence / absence of the document at one of two predetermined locations in the transport path and the passing state of the document at the other.

For example, it is conceivable that the position of the first document, which is one of the two locations, is the position of the end portion of the document tray on the downstream side in the document transport direction. Thereby, it is possible to determine whether or not the document is set in the document tray before the operation of the automatic document carrier is started.

Further, it is conceivable that the position of the second document, which is the other of the two locations, is the curved portion in the transport path. If it is not possible to obtain a determination result that the document has passed the second document position when the document is conveyed, it is considered that a jam state has occurred in which the transfer path is clogged with the document. In this case, the image reading device can stop the automatic document carrier and notify the jam state.

On the other hand, it is desirable that a document transport state determining device for determining the presence / absence of the document at the first document position and the passing state of the document at the second document position be realized with as few parts as possible. Therefore, it is not preferable to provide two sensors corresponding to the two locations of the transport path.

An object of the present invention is a document transport state determining device capable of determining the presence or absence of the document in one of two locations of the document transport path and the passing state of the document in the other with a small number of parts. It is an object of the present invention to provide an image reader.

The document transport state determination device according to one aspect of the present invention determines the state of the document transport path from the document tray to the ejection tray. The document transport state determination device includes a first rotating body, a second rotating body, an object detection sensor, and a signal determination device. The first rotating body is a first axis arranged along the width direction of the transport path and rotatably supported, and a first axis formed extending from the first axis and intersecting the transport path at a first document position. It has a driving arm portion and a first driven arm portion formed extending from the first axis to a position other than the transport path, and the first driving arm portion comes into contact with the document at the first document position. Displace by. The second rotating body is formed so as to extend from the second axis, which is rotatably supported and arranged in parallel with the first axis, and is on the downstream side of the first document position in the document transport direction. It has a second driving arm portion that intersects the transport path at the second document position, and a second driven arm portion that extends from the second axis to a position other than the transport path. Is displaced by contacting the document at the position of the second document. The object detection sensor detects an object existing in a predetermined detection area. The signal determination device determines the state of the transport path based on a detection signal indicating whether or not the object is detected by the object detection sensor. The tip of the first driven arm portion is located outside the detection region as a whole from the first base point whose at least a part is located in the detection region according to the displacement of the first driving arm portion. It forms the first detected part that is displaced to the end point. The second driven arm portion passes through the detection region from the second base point whose entire portion is located outside the detection region according to the displacement of the second driving arm portion, and the entire portion moves out of the detection region again. It forms a second detected part that is displaced to the second end point where it is located. The signal determination device determines a normal passage state in which the document normally passes through the transport path or a jam state in which the transport path is clogged with the document, based on the change pattern of the detection signal.

The image reading device according to another aspect of the present invention includes the document transport state determination device, the document transport device that transports the document along the transport path, the transport control device that controls the document transport device, and the above. It includes an image sensor that reads an image from the document that passes through a predetermined reading position in the transport path.

According to the present invention, a document transport state determining device capable of determining the presence or absence of the document in one of two locations of the document transport path and the passing state of the document in the other with a small number of parts, and a document transport state determining device thereof. It becomes possible to provide an image reading device comprising the above.

FIG. 1 is a configuration diagram of an image reading device according to an embodiment. FIG. 2 is a block diagram showing a configuration of a control device in the image reading device according to the embodiment. FIG. 3 is a configuration diagram of a mechanical portion of an automatic document transfer machine and a document transfer state determination device in the image reading device according to the embodiment. FIG. 4 is a perspective view of a mechanical portion of the document transport state determination device in the image reading device according to the embodiment. FIG. 5 is a diagram showing a mechanical portion of an automatic document transfer machine and a document transfer state determination device when a document is set in a document tray in the image reading device according to the embodiment. FIG. 6 is a diagram showing a mechanical portion of an automatic document transfer machine and a document transfer state determination device during document transfer in the image reading device according to the embodiment. FIG. 7 shows the mechanical parts of the automatic document transfer machine and the document transfer state determination device when the first document passes through the second document position and the transfer of the second document starts in the image reading device according to the embodiment. It is a figure which shows. FIG. 8 is a diagram showing a mechanical portion of an automatic document transfer machine and a document transfer state determination device when a document break occurs during document transfer in the image reading device according to the embodiment. FIG. 9 is a time chart showing an example of a change pattern of a detection signal of an object detection sensor when a document set state or a document cut state is determined in the image reading device according to the embodiment. FIG. 10 is a time chart showing an example of a change pattern of the detection signal of the object detection sensor when the normal passing state is determined in the image reading device according to the embodiment. FIG. 11 is a time chart showing an example of a change pattern of the detection signal of the object detection sensor when the normal passing state and the document cutting state are determined in the image reading device according to the embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are examples that embody the present invention, and do not limit the technical scope of the present invention.

[Configuration of image reader 1]
The image reading device 1 according to the embodiment is a device that reads an image from the document 9.

As shown in FIG. 1, the image reading device 1 includes a main body 101, a document cover 102, a light emitting unit 11, a plurality of mirrors 12, a lens 13, an image sensor 14, a carriage 20, a guide rail 21, and an ADF (Automatic Documents Feeder). 15. The contact glass 16, the platen glass 17, the driving device 100, the operating device 801, the display device 802, the control device 8, and the like are provided.

The longitudinal direction of the contact glass 16, the carriage 20, the light emitting unit 11, the plurality of mirrors 12, the lens 13 and the image sensor 14 is the main scanning direction D1.

In FIGS. 1, 2, 4 to 7, the depth direction toward the drawing is the main scanning direction D1, and the left-right directions toward the drawing are the sub-scanning directions D2. The main scanning direction D1 and the sub-scanning direction D2 are horizontal directions, and the sub-scanning direction D2 is a direction orthogonal to the main scanning direction D1. The direction orthogonal to the main scanning direction D1 and the sub-scanning direction D2 is the height direction D3.

The main body 101 is a housing for accommodating the carriage 20 and the guide rail 21. The contact glass 16 and the platen glass 17 are arranged side by side in the sub-scanning direction D2 on the upper surface of the main body 101.

The carriage 20 supports a light emitting unit 11, a plurality of mirrors 12, a lens 13, and an image sensor 14. The guide rail 21 movably supports the carriage 20 along the sub-scanning direction D2 below the contact glass 16 and the platen glass 17.

The light emitting unit 11 emits light upward. For example, the light emitting unit 11 is an LED array including a plurality of LEDs arranged along the main scanning direction D1.

The plurality of mirrors 12 and the lens 13 guide the reflected light of the light emitted from the light emitting unit 11 to the image sensor 14. The plurality of mirrors 12 and the lens 13 are examples of light guide members.

The carriage 20 moves along the sub-scanning direction D2 when a driving force is applied from the driving device 100.

The light emitted by the light emitting unit 11 irradiates the document 9, and the plurality of mirrors 12 and the lenses 13 guide the reflected light reflected by the document 9 to the light receiving unit of the image sensor 14. At that time, the lens 13 collects the reflected light on the light receiving portion of the image sensor 14.

The image sensor 14 receives the reflected light and detects the amount of the reflected light. Further, the image sensor 14 outputs a line image signal representing the detection result of the amount of reflected light.

In the example shown in FIG. 1, the image sensor 14 is a CCD (Charge Coupled Device) type sensor. It is also conceivable that a CIS (Contact Image Sensor) in which a light source, a C-MOS type image sensor, and a lens are unitized is adopted. In this case, the carriage 20 supports the CIS.

The document cover 102 is displaceably supported between a closed position on the upper surface of the main body 101 and an open position farther from the upper surface of the main body 101 than the closed position. The closed position is a position that covers the contact glass 16 and the platen glass 17 from above.

The document cover 102 is connected to the main body 101 by a hinge (not shown). The hinge rotatably supports the document cover 102 between the closed position and the open position.

The ADF 15 is incorporated in the document cover 102. The ADF 15 operates when the document cover 102 is in the closed position, that is, when the document cover 102 covers the contact glass 16.

As shown in FIG. 1, the ADF 15 includes a document tray 151, a document pickup device 152, a plurality of sets of transport roller pairs 153, and an ejection tray 154. The ADF 15 is an example of a document transporting device that transports a document 9 along a transport path 150.

The transport path 150 is a movement path of the document 9 from the document tray 151 to the discharge tray 154 via the reading position P0. The transport path 150 is a path having a curved portion that folds back from the feeding direction of the document 9 from the document tray 151 to the discharging direction of the document 9 to the discharging tray 154.

The document pickup device 152 feeds the document 9 from the document tray 151, and the plurality of sets of transport rollers 153 transport the document 9 fed from the document tray 151 along the transport path 150, and further to the discharge tray 154. Discharge.

The document pickup device 152 and the plurality of sets of transport roller pairs 153 transport the document 9 by applying a driving force from the drive device 100. The document pickup device 152 and the plurality of sets of transport roller pairs 153 operate in a state where the document cover 102 is in the closed position and the document 9 is set in the document tray 151.

The image reading device 1 selectively executes the flatbed type image reading process and the document feed type image reading process. The driving device 100 selectively applies a driving force to the carriage 20 and a plurality of sets of transport roller pairs 153.

The flatbed image scanning process is a process of scanning an image from the document 9 by scanning the document 9 placed on the platen glass 17. In the flatbed image reading process, the drive device 100 reciprocates the carriage 20 along the platen glass 17.

On the other hand, the document feed type image scanning process is a process of scanning an image from the document 9 by scanning the document 9 conveyed by the ADF 15. In the document feed type image reading process, the drive device 100 moves the carriage 20 to a position facing the reading position P0 and then stops the carriage 20, and further operates the document pickup device 152 and a plurality of sets of transport roller pairs 153. Further, the image sensor 14 reads an image from the document 9 passing through the predetermined reading position P0 in the transport path 150.

The operation device 801 is a device that accepts human operations, and includes, for example, operation buttons and a touch panel. The display device 802 is a device that displays information, and includes, for example, a panel display device such as a liquid crystal display unit.

The control device 8 executes various data processing and controls of devices such as a light emitting unit 11, an image sensor 14, a drive device 100, and a display device 802.

As shown in FIG. 2, the control device 8 includes a CPU (Central Processing Unit) 81 and peripheral devices such as a RAM (Random Access Memory) 82, a secondary storage device 83, and a signal interface 84.

The CPU 81 is a processor that executes various data processing and control by executing a computer program. The RAM 82 is a computer-readable volatile storage device. The RAM 82 primarily stores the computer program executed by the CPU 81 and data to be output and referenced in the process of executing various processes by the CPU 81.

The CPU 81 includes a plurality of processing modules realized by executing the computer program. The plurality of processing modules include a main control unit 8a, a reading control unit 8b, a transport control unit 8c, a signal determination unit 8d, and the like.

The main control unit 8a executes start control for starting various processes in response to an operation on the operation device 801 and control for the display device 802.

The reading control unit 8b controls the operation of the carriage 20 by controlling the driving device 100. Further, the reading control unit 8b controls the light emitting unit 11 and the image sensor 14 to acquire image data based on the line image signal output from the image sensor 14.

The transport control unit 8c controls the ADF15. The control device 8 including the transfer control unit 8c is an example of a transfer control device that controls the ADF 15. The signal determination unit 8d determines the state of the image reading device 1 based on a signal representing a detection result of a sensor other than the image sensor 14 included in the image reading device 1.

The secondary storage device 83 is a computer-readable non-volatile storage device. The secondary storage device 83 can store and update the computer program and various data. For example, one or both of the flash memory and the hard disk drive are adopted as the secondary storage device 83.

The signal interface 84 converts signals output by various sensors such as the image sensor 14 into digital data, and transmits the converted digital data to the CPU 81. Further, the signal interface 84 converts the control command output by the CPU 81 into a control signal, and transmits the control signal to the device to be controlled.

By the way, in the image reading device 1, there are cases where it is desired to determine the presence / absence of the document 9 at one of the two predetermined locations in the transport path 150 and the passing state of the document 9 at the other.

For example, as shown in FIG. 1, it is conceivable that the first document position P1 which is one of the two locations is the position of the downstream end of the document tray 151 in the document transport direction. As a result, it is possible to determine whether or not the document 9 is set in the document tray 151 before the operation of the ADF 15 is started.

Further, as shown in FIG. 1, it is conceivable that the second document position P2, which is the other of the two locations, is the curved portion in the transport path 150. If it is not possible to obtain a determination result that the document 9 has passed the second document position P2 when the document 9 is conveyed, it is considered that a jam state has occurred in which the transfer path 150 is clogged with the document 9. In this case, the image reading device 1 can stop the ADF 15 and notify the jam state.

Therefore, the image reading device 1 includes a document transport state determining device 3 that determines the state of the transport path 150 (see FIG. 3). The document transport state determination device 3 determines the presence / absence of the document 9 at the first document position P1 and the passing state of the document 9 at the second document position P2.

On the other hand, it is desirable that the document transport state determination device 3 is realized with as few parts as possible. Therefore, it is not preferable to provide two sensors corresponding to the two locations of the transport path 150.

In the image reading device 1, the document transporting state determining device 3 determines the presence / absence of the document 9 at the first document position P1 of the transport path 150 of the document 9 and the passing state of the document 9 at the second document position P2 with a small number of parts. Can be determined.

As shown in FIGS. 1 and 3, the first document position P1 is the position of the downstream end of the document tray 151 in the document transport direction. The second document position P2 is the curved portion in the transport path 150. The second document position P2 is a position on the downstream side of the transfer path 150 in the document transfer direction with respect to the first document position.

[Original transport state determination device 3]
As will be described later, the document transport state determination device 3 determines the state of the transport path 150.

The document transport state determination device 3 includes a first rotating body 4, a second rotating body 5, and an object detection sensor 30. The control device 8 including the signal determination unit 8d is an example of a signal determination device that is a part of the document transport state determination device 3.

The object detection sensor 30 detects an object existing in a predetermined detection area 300. The object detection sensor 30 outputs a detection signal indicating whether or not the object is detected in the detection area 300.

In the present embodiment, the object detection sensor 30 is a transmissive photo sensor including a light source that emits detection light to the detection region 300 and a light receiving element that detects the detection light that has passed through the detection region 300. A reflective photo sensor may be adopted as the object detection sensor 30.

As shown in FIGS. 3 and 4, the first rotating body 4 has a first shaft 41, a first driving arm portion 42, a first driven arm portion 43, and a first balancer 44.

The first axis 41 is arranged along the main scanning direction D1 and is rotatably supported by a frame (not shown). The main scanning direction D1 is the width direction of the transport path 150.

The first driving arm portion 42 is formed so as to extend from the first shaft 41 and intersects the transport path 150 at the first document position P1. Further, the first driven arm portion 43 is formed so as to extend from the first shaft 41 to a position other than the transport path 150.

The first driving arm portion 42 is displaced by coming into contact with the document 9 at the first document position P1. That is, the first driving arm portion 42 is displaced in the feeding direction of the document 9 from the document tray 151 by the pressure received from the document 9 set in the document tray 151.

FIG. 3 shows a state before the first driving arm portion 42 is displaced due to contact with the document 9, and FIGS. 5 to 7 show a state in which the first driving arm portion 42 is displaced due to contact with the document 9.

When the first driving arm portion 42 is displaced, the first shaft 41 is rotated and the first driven arm portion 43 is displaced.

The tip of the first driven arm portion 43 forms a first detected portion 430 that is displaced from the first base point to the first end point according to the displacement of the first driving arm portion 42. In FIG. 4, the first displacement direction D11 from the first base point to the first end point is indicated by a broken line arrow.

As shown in FIG. 3, a first stopper 31 protruding from the frame (not shown) locks the first driven arm portion 43 located at the first base point. As a result, the first detected portion 430 is restricted from being displaced from the first base point to the opposite side of the first displacement direction D11.

FIG. 3 shows a state in which the first detected unit 430 exists at the first base point, and FIGS. 5 to 7 show a state in which the first detected unit 430 exists at the first end point.

In the present embodiment, when the document 9 is set in the document tray 151, the first driving arm portion 42 is displaced by coming into contact with the document 9, and the first detected portion 430 is displaced from the first base point to the first. 1 Displace to the end point.

When the first detected unit 430 is located at the first base point, at least a part of the first detected unit 430 is located in the detection area 300 of the object detection sensor 30. On the other hand, when the first detected unit 430 is located at the first end point, the entire first detected unit 430 is located outside the detection area 300.

In the present embodiment, the first detected portion 430 has a first plate piece portion 43a, an intermediate opening portion 43b, and a second plate piece portion 43c arranged from the downstream side to the upstream side in the first displacement direction D11. The first plate piece portion 43a and the second plate piece portion 43c each have a plate shape along a plane orthogonal to the main scanning direction D1. The intermediate opening 43b is a chipped portion or a hole formed between the first plate piece portion 43a and the second plate piece portion 43c.

When the first plate piece portion 43a or the second plate piece portion 43c is located in the detection area 300, the object detection sensor 30 detects the first detected portion 430. On the other hand, when the entire first detected unit 430 is located outside the detection area 300, or when the intermediate opening 43b is located inside the detection area 300, the object detection sensor 30 does not detect the first detected unit 430. ..

In the present embodiment, the position of the first detected portion 430 when the first plate piece portion 43a is located in the detection region 300 is the first base point. Therefore, when the first detected portion 430 is displaced from the first base point to the first end point, the first plate piece portion 43a is first displaced from the inside of the detection region 300 to the outside of the detection region 300, and the intermediate opening portion is formed. 43b is displaced from outside the detection area 300 to the inside of the detection area 300, subsequently, the intermediate opening 43b is displaced from the inside of the detection area 300 to the outside of the detection area 300, and the second plate piece portion 43c is displaced into the detection area 300. Finally, the second plate piece portion 43c is displaced from the inside of the detection area 300 to the outside of the detection area 300.

The first balancer 44 is formed so as to extend from the first shaft 41. The first balancer 44 is a portion for balancing the moment of force centered on the first axis 41 between the first driving arm portion 42 and the first driven arm portion 43.

As shown in FIGS. 3 and 4, the second rotating body 5 has a second shaft 51, a second driving arm portion 52, a second driven arm portion 53, and a second balancer 54.

The second axis 51 is arranged along the main scanning direction D1 and is rotatably supported by a frame (not shown). The second axis 51 is arranged parallel to the first axis 41.

The second prime mover arm portion 52 is formed so as to extend from the second shaft 51 and intersects the transport path 150 at the second document position P2. Further, the second driven arm portion 53 is formed so as to extend from the second shaft 51 to a position other than the transport path 150.

The second driving arm portion 52 is displaced by coming into contact with the document 9 at the second document position P2. The second driving arm portion 52 is displaced in the transport direction of the document 9 by the pressure received from the tip of the document 9.

FIGS. 3, 5 and 7 show the state before the second driving arm portion 52 is displaced due to the contact with the document 9, and FIGS. 6 and 8 show the state before the second driving arm portion 52 is displaced due to the contact with the document 9. Indicates the state.

When the second driving arm portion 52 is displaced, the second shaft 51 rotates and the second driven arm portion 53 is displaced.

The tip of the second driven arm portion 53 forms a second detected portion 530 that is displaced from the second base point to the second end point according to the displacement of the second driving arm portion 52. In FIG. 4, the second displacement direction D12 from the second base point to the second end point is indicated by a broken line arrow.

The second detected portion 530 has a plate shape along a plane orthogonal to the main scanning direction D1. The second detected portion 530 is formed parallel to the first detected portion 430.

As shown in FIG. 3, a second stopper 32 protruding from the frame (not shown) locks the second driven arm portion 53 located at the second base point. As a result, the second detected portion 530 is restricted from being displaced from the second base point to the opposite side of the second displacement direction D12.

When the document 9 passes through the second document position P2, the second driving arm portion 52 is displaced by coming into contact with the document 9, and the second detected portion 530 is displaced from the second base point to the second end point. To do.

FIGS. 3, 5 and 7 show a state in which the second detected unit 530 exists at the second base point, and FIGS. 6 and 8 show a state in which the second detected unit 530 exists at the second end point.

When the second detected unit 530 is located at the second base point or the second end point, the entire second detected unit 530 is located outside the detection area 300. Then, according to the displacement of the second driving arm portion 52, the second detected portion 530 is displaced from the second base point to the second end point via the detection region 300.

The second balancer 54 is formed so as to extend from the second shaft 51. The second balancer 54 is a portion for balancing the moment of force centered on the second axis 51 between the second driving arm portion 52 and the second driven arm portion 53.

Further, the second rotating body 5 has a locking portion 55 formed on the second driven arm portion 53. As shown in FIG. 8, the locking portion 55 locks the first driven arm portion 43 when the second detected portion 530 is held at the second end point, thereby engaging the first detected portion 430. Is held in the intermediate holding position, which is a position not detected by the object detection sensor 30.

In the example shown in FIG. 8, the intermediate holding position is the position of the first detected portion 430 when the intermediate opening 43b is located in the detection region 300.

In the control device 8, the signal determination unit 8d determines the state of the transport path 150 based on the detection signal output by the object detection sensor 30. Specifically, the signal determination unit 8d determines whether the transport path 150 is in the normal passage state or the jam state based on the change pattern of the detection signal.

The normal passage state is a state in which the document 9 has normally passed through the transport path 150. The jam state is a state in which the document 9 is clogged with the transport path 150.

Further, the signal determination unit 8d also determines whether the transport path 150 is in the document set state or the document cut state based on the change pattern of the detection signal. The document setting state is a state in which the document 9 is set in the document tray 151. The document cut state is a state in which the document 9 is lost from the document tray 151.

In the example of the detection signal shown in FIGS. 9 to 11, when the object detection sensor 30 detects the first detected unit 430 or the second detected unit 530, the high detection signal is output and the first detection signal is output. This is an example in which the low detection signal is output when neither the detected unit 430 nor the second detected unit 530 is detected.

As shown in FIG. 9, the first reference state St1 which is the state of the detection signal when the document 9 is not present in the document tray 151 or in the middle of the transport path 150 is High. The first reference state St1 is a state in which the first plate piece portion 43a of the first detected portion 430 is detected by the object detection sensor 30.

The first change pattern Pt11 shown in FIG. 9 is a change pattern of the detection signal when the first detected portion 430 is displaced from the first base point to the first end point. When the first detected portion 430 is displaced from the first base point to the first end point, the first plate piece portion 43a is displaced outward from the detection region 300, and the intermediate opening 43b and the second plate piece portion 43c are displaced. It passes through the detection area 300 in order.

Therefore, the first change pattern Pt11 is a pattern that changes from High in the state before the start of change to Low-High-Low. The signal determination unit 8d determines that the transport path 150 is in the document set state when the detection signal changes in the first change pattern Pt11.

When the transport path 150 changes from the state shown in FIG. 3 to the state shown in FIG. 4, the detection signal changes in the first change pattern Pt11.

A second state of the detection signal when the document 9 is set in the document tray 151 and the document 9 does not exist at a position downstream of the first document position P1 in the transport path 150 in the document transport direction. The reference state St2 is Low.

The signal determination unit 8d determines that the transport path 150 is in the document cut state when the detection signal changes in the first reverse change pattern Pt12, which is the reverse pattern of the first change pattern Pt11 (see FIG. 9). ..

In FIGS. 10 and 11, the reference time point Tx0 is the time when the document 9 is started to be transferred under the condition that the transfer path 150 is in the document set state.

As shown in FIG. 10, after the reference time point Tx0, the detection signal changes in the second change pattern Pt21 within the predetermined first period T1 and further within the predetermined second period T2. 2 It is determined that the transport path 150 is in the normal passage state when the standard reciprocating pattern Pt20 that changes in the reverse change pattern Pt22 changes.

The second change pattern Pt21 is a change pattern of the detection signal when the second detected portion 530 is displaced from the second base point to the second end point. The second reverse change pattern Pt22 is the reverse pattern of the second reverse change pattern Pt21.

The second change pattern Pt21 is a pattern that changes from Low in the state before the start of change to High-Low. Therefore, the second change pattern Pt21 and the second reverse change pattern Pt22 are the same pattern.

In the present embodiment, the first change pattern Pt 11 is different from the change pattern of the detection signal when the second detected portion 530 is displaced from the position where the second detected portion 530 is passing in the detection region 300 to the second end point. 1 The detected portion 430 is formed in a shape different from that of the second detected portion 530.

Therefore, the signal determination unit 8d has a state in which the first detected unit 430 is displaced from the first base point to the first end point and a state in which the second detected unit 530 is displaced from the inside of the detection area 300 to the outside of the detection area 300. Can be determined.

In the present embodiment, the change pattern of the detection signal when the second detected unit 530 is displaced from the position where it is passing through the detection area 300 to the second end point is a pattern that changes from High to Low. ..

The first period T1 and the second period T2 are periods in which two time points in which a predetermined time has elapsed from the reference time point Tx0 are set as a start time point and an end time point, respectively. The second period T2 is a period after the first period T1.

The first period T1 is determined based on the time required for the tip of the document 9 to reach the second document position P2. The second period T2 is determined based on the time required for the rear end of the document 9 to reach the second document position P2.

Further, as shown in FIG. 11, the signal determination unit 8d performs a transport path when the detection signal changes in the third change pattern Pt31 within the predetermined third period T3 after the reference time point Tx0. It is determined that 150 is in the document out state.

In the third change pattern Pt31, the first detected portion 430 is held by the first detected portion 430 in a state where the second detected portion 530 is held at the second end point because the original 9 is passing through the second original position P2. It is a change pattern of the detection signal when displacing from the end point to the intermediate holding position.

In the present embodiment, the third change pattern Pt31 is a pattern that changes from the Low state before the start of the change to High-Low.

The third period T3 is a period between the first period T1 and the second period T2. The third period T3 is also a period in which two time points in which a predetermined time has elapsed from the reference time point Tx0 are set as a start time point and an end time point. The third period T3 is determined based on the time required for the rear end of the document 9 to pass through the first document position P1.

Then, the signal determination unit 8d determines that the transport path 150 is in the jam state when the detection signal does not change in the standard reciprocating pattern Pt20 shown in FIGS. 10 and 11 after the reference time point Tx0.

Further, the signal determination unit 8d records the jam history data in the secondary storage device 83 when it is determined that the transfer path 150 is in the jam state. The fact that the jam history data is recorded in the secondary storage device 83 indicates that the transport path 150 is in a state where it is determined to be in the jam state.

Further, when it is determined that the transport path 150 is in the jam state, the transport control unit 8c stops the ADF 15, and the main control unit 8a executes a process of notifying through the display device 802 that the jam state has occurred. To do.

Further, when the signal determination unit 8d determines that the transfer path 150 is in the jam state and then the predetermined jam release condition is satisfied, the signal determination unit 8d indicates that the transfer path 150 is in the jam elimination state. Is determined. The jam elimination letter is a state in which the original document 9 clogged in the transport path 150 has been removed.

The signal determination unit 8d erases the jam history data of the secondary storage device 83 when the jam release condition is satisfied.

The image reading device 1 may include a unit open / close sensor (not shown) provided on the document cover 102. The unit open / close sensor is a sensor that detects an open state or a closed state of a transport guide unit (not shown) that opens the transport path 150.

The transport guide unit is a unit in which one of a pair of document guides that guide the document 9 along the transport path 150 and an exterior cover portion that forms a part of the exterior of the document cover 102 are integrated.

For example, the jam release condition includes a cover condition in which the unit open / close sensor changes the transport guide unit from the closed state to the open state, and further changes to the closed state.

In the above case, it is conceivable that the jam release condition is a condition that the signal state condition that the detection signal is the second reference state St2 shown in FIG. 9 is satisfied after the cover condition is satisfied. ..

By the way, under the situation where the signal determination unit 8d determines the jam state, the energization of the control device 8 and the drive device 100 may be stopped by the operation of the user. In this case, the user performs the work of eliminating the jam in the state where the energization is stopped.

Therefore, in a situation where the signal determination unit 8d determines the jam state, the control device 8 may be restarted after the energization of the control device 8 and the drive device 100 is stopped.

The signal determination unit 8d cannot determine changes in various signals in the state where the energization is stopped.

Therefore, the signal determination unit 8d determines whether or not the state of the detection signal is a predetermined unknown state when the system is restarted under the condition of determining the jam state. When the signal determination unit 8d was restarted, it was restarted under the condition of determining the jam state based on the recording status of the jam history data in the secondary storage device 83, or restarted under other circumstances. Determine if you did.

In this embodiment, the unknown state is the second reference state St2 shown in FIG. In the unknown state, the document 9 may be set in the document tray 151, and it is unknown whether or not the jam has been resolved.

When the signal determination unit 8d determines the unknown state at the time of the restart, the transfer control unit 8c causes the ADF 15 to execute the trial transfer operation. The trial transfer operation is an operation in which the document 9 is transported in the forward direction from the document tray 151 to the second document position P2 of the transfer path 150, and then the document 9 is conveyed in the reverse direction to the document tray 151. The forward direction is a normal document transport direction.

For example, it is conceivable that the ADF 15 transports the document 9 in each of the forward direction and the reverse direction at a slower speed than when the document feed type image reading process is performed in the trial transfer operation.

Then, the signal determination unit 8d determines whether the transfer path 150 is in the jam-eliminating state or the jam state based on the change pattern of the detection signal when the ADF 15 is executing the trial transfer operation.

Specifically, the signal determination unit 8d conveys when the detection signal shows a change satisfying the first change condition and the second change condition shown below when the ADF15 is executing the trial transfer operation. It is determined that the route 150 is in the jam-resolved state, and if not, the transport route 150 is determined to be in the jam-resolved state.

The first change condition is that the detection signal is shown in FIGS. 9 and 10 within a predetermined fourth period when the ADF 15 is transporting the document 9 in the forward direction in the trial transport operation. It is a condition that the second change pattern Pt21 changes.

The fourth period is determined based on the time required from the start of transporting the document 9 in the forward direction in the trial transport operation until the tip of the document 9 reaches the second document position P2.

The second change condition is that the detection signal is shown in FIGS. 9 and 10 within a predetermined fifth period when the ADF 15 is transporting the document 9 in the opposite direction in the trial transport operation. 2 It is a condition that the reverse change pattern Pt22 changes.

The fifth period is determined based on the time required from the start of transporting the document 9 in the reverse direction in the trial transport operation until the tip of the document 9 passes through the second document position P2 in the reverse direction.

Even when the energization of the control device 8 is stopped and the control device 8 is restarted by determining the state of the transport path based on the change pattern of the detection signal when the trial transport operation is performed, the transport path of the transport path The state can be determined.

As shown above, the document transport state determination device 3 can determine the states of the transport path 150 at two locations with a small number of parts without requiring a plurality of object detection sensors 30.

1: Image reading device 3: Original transfer state determination device 4: First rotating body 5: Second rotating body 8: Control device 8a: Main control unit 8b: Reading control unit 8c: Transfer control unit 8d: Signal determination unit 9: Document 11: Light emitting unit 12: Mirror 13: Lens 14: Image sensor 16: Contact glass 17: Platen glass 20: Carriage 21: Guide rail 30: Object detection sensor 31: First stopper 32: Second stopper 41: First axis 42: 1st driving arm part 43: 1st driven arm part 43a: 1st plate piece part 43b: Intermediate opening 43c: 2nd plate piece part 44: 1st balancer 51: 2nd axis 52: 2nd driving arm part 53: Second driven arm portion 54: Second balancer 55: Locking portion 81: CPU
82: RAM
83: Secondary storage device 84: Signal interface 100: Drive device 101: Main body 102: Document cover 150: Transport path 151: Document tray 152: Document pickup device 153: Transport roller pair 154: Discharge tray 300: Detection area 430: 1st detected unit 530: 2nd detected unit 801: Operating device 802: Display device D1: Main scanning direction (width direction of transport path)
D11: First displacement direction D12: Second displacement direction D2: Sub-scanning direction D3: Height direction P0: Reading position P1: First document position P2: Second document position Pt11: First change pattern Pt12: First reverse change Pattern Pt20: Standard reciprocating pattern Pt21: Second change pattern Pt22: Second reverse change pattern Pt31: Third change pattern St1: First reference state St2: Second reference state T1: First period T2: Second period T3: First 3 periods

Claims (6)

A document transport status determination device that determines the status of the document transport path from the document tray to the eject tray.
A first axis arranged along the width direction of the transport path and rotatably supported, a first prime mover arm portion formed extending from the first axis and intersecting the transport path at the first document position, and the first A first rotation having a first driven arm portion formed extending from one axis to a position other than the transport path, and the first driving arm portion being displaced by contacting the document at the first document position. With the body
The second axis arranged parallel to the first axis and rotatably supported, the transfer path at the second document position on the downstream side of the first document position in the document transfer direction, which is formed extending from the second axis. It has a second driving arm portion that intersects with, and a second driven arm portion that extends from the second axis to a position other than the transport path, and the second driving arm portion is at the second document position. A second rotating body that displaces when it comes into contact with the document,
An object detection sensor that detects an object existing in a predetermined detection area,
A signal determination device for determining the state of the transport path based on a detection signal indicating whether or not the object is detected by the object detection sensor is provided.
The tip of the first driven arm portion is located outside the detection region as a whole from the first base point whose at least a part is located in the detection region according to the displacement of the first driving arm portion. It forms the first detected part that is displaced to the end point,
The tip of the second driven arm portion passes through the detection region from the second base point whose entire portion is located outside the detection region according to the displacement of the second driving arm portion, and the entire portion is detected again. It forms a second detected part that is displaced to the second end point located outside the region.
The signal determination device is a document transfer state determination device that determines a normal passage state in which the document normally passes through the transfer path or a jam state in which the document is jammed in the transfer path, based on a change pattern of the detection signal. The first change pattern, which is the change pattern of the detection signal when the first detected portion is displaced from the first base point to the first end point, is such that the second detected portion is passing through the detection region. The first aspect of the present invention, wherein the first detected portion is formed in a shape different from that of the second detected portion so as to be different from the change pattern of the detected signal when the position is displaced from the second end point. Document transport status determination device. The first document position is the position of the downstream end of the document tray in the document transport direction.
When the document is set in the document tray, the first driving arm portion is displaced by contacting the document, and the first detected portion is displaced from the first base point to the first end point. ,
The second document position is a position downstream of the document tray in the document transport direction.
When the document passes through the second document position, the second driving arm portion is displaced by coming into contact with the document, and the second detected portion is displaced from the second base point to the second end point. And
The signal determination device is
When the detection signal changes in the first change pattern, it is determined that the document is in the document set state set in the document tray.
When the detection signal changes in the reverse pattern of the first change pattern, it is determined that the document is in a document-cut state in which the document has disappeared from the document tray.
After the transfer of the document is started under the document set state, the detection signal is displaced from the second base point to the second end point within a predetermined first period. When the change is made in the second change pattern which is the change pattern of the detection signal at the time of the change, and is changed in the standard reciprocating pattern which changes in the reverse pattern of the second change pattern within a predetermined second period. It is determined that the transport path is in the normal passage state, and
The second aspect of the present invention, wherein the transport path is determined to be in the jam state when the detection signal does not change in the standard reciprocating pattern after the transport of the document is started under the document set state. Document transport status determination device. The second rotating body further includes a locking portion formed on the second driven arm portion.
When the second detected portion is held at the second end point, the locked portion does not detect the first detected portion by the object detection sensor by locking the first driven arm portion. The document transport state determination device according to claim 3, which is held at a position. The document transport state determination device according to any one of claims 1 to 4,
A document transporting device that transports the document along the transport path, and
A transfer control device that controls the document transfer device, and
An image reading device including an image sensor that reads an image from the document that passes through a predetermined reading position in the transport path. When the signal determination device is restarted under the condition of determining the jam state, the signal determination device determines whether or not the state of the detection signal is a predetermined unknown state.
When the signal determination device determines the unknown state at the time of restarting, the transport control device transports the document from the document tray to the second document position, and then reverses the document to the document tray. The document transfer device is made to execute a trial transfer operation for transfer.
The signal determination device determines whether the transfer path is in the jam-resolved state or the jam state based on the change pattern of the detection signal when the document transfer device is executing the trial transfer operation. The image reading device according to claim 5.