JP2010054616A - Carriage locking device and image reader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cope with such a problem that it is desirable to provide a carriage locking device which can automatically lock a carriage or release such locking even when engagement or disengagement of a locking member is not manually performed, and to provide an image reader including the carriage locking device. <P>SOLUTION: The carriage locking device includes: the carriage that is disposed to be movable in a predetermined direction; the locking member that locks the carriage; a motive power transmission part that transmits motive power from a driving source to the carriage so as to drive the carriage; and a releasing member that is configured to release locking of the carriage by the locking member. The motive power transmission part further transmits motive power to the releasing member, and the releasing member releases locking on the basis of the transmitted motive power. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a carriage locking device for locking a carriage and an image reading device on which the carriage locking device is mounted, and in particular, a carriage locking device and an image reading capable of automatically locking and unlocking a carriage. Relates to the device.

  2. Description of the Related Art Image reading apparatuses such as scanners, facsimile machines, and multi-function machines are known in which an automatic document supply unit that automatically supplies a sheet document is mounted on a reading sensor as an image reading unit. In such an image reading apparatus, a reading sensor reads an image of a sheet document supplied from an automatic document supply unit, and acquires image data.

  Further, in the image reading apparatus described above, there is a case where a document table on which a booklet document such as a book can be placed is used. Japanese Patent Application Laid-Open Publication No. 2004-228561 discloses a technique of an image reading apparatus in which a carriage on which a reading sensor is mounted is mounted so as to be able to travel along a document table.

This type of image reading apparatus is conventionally provided with a carriage locking device having a locking member for locking the carriage so that the carriage does not move inside the apparatus when the apparatus main body is moved. .
Japanese Patent Laid-Open No. 10-229477

  However, in the above-described conventional carriage locking device, the user has to manually engage or disengage the locking member, which is troublesome. In addition, when the user forgets to engage the locking member and moves the image reading apparatus main body, or forgets to disengage and moves the carriage, the reading sensor is caused by vibration or shock. There was a problem that damage and a decrease in accuracy occurred. Furthermore, if the user accidentally engages the locking member during the reading process with the locking member engaged / disengaged, there is a possibility that a malfunction may occur in the reading sensor.

  Accordingly, a carriage locking device that can automatically lock and unlock the carriage without requiring the user to manually engage and disengage the locking member and an image reading apparatus including the carriage locking device are desired. It was rare.

  The present invention adopts the following configuration in order to solve the above points.

<Configuration 1>
A carriage locking device according to the present invention includes a carriage that is movably disposed in a predetermined direction, a locking member that locks the carriage, and power from a drive source to drive the carriage. A power transmission unit for transmitting and a release member for releasing the locking of the carriage by the locking member; the power transmission unit further transmits power to the release member; and the release member is based on the transmitted power. Then, the locking is released.

<Configuration 2>
An image reading apparatus according to the present invention is disposed so as to be movable in a predetermined direction, and includes a carriage on which an image reading unit for reading an image of a document is mounted, a locking member that locks the carriage, and a carriage. In order to drive, a power transmission unit that transmits power from a drive source to the carriage and a release member for releasing the locking of the carriage by the locking member are provided, and the power transmission unit further supplies power to the release member. And the release member releases the lock based on the transmitted power.

  According to the carriage locking device and the image reading device of the present invention, the carriage is locked by the locking member to prevent the carriage from moving, and when the carriage is driven by the power transmission unit, the power transmission unit to the release member. Power is transmitted and the carriage is automatically unlocked. Accordingly, it is possible to reliably prevent the image reading unit mounted on the carriage from being damaged or reduced in accuracy.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Here, the case where the present invention is applied to a scanner equipped with a carriage locking device will be described as an example.

FIG. 3 is a schematic configuration diagram of a scanner according to the present invention.
FIG. 3A is a side view of the scanner, and FIG. 2C is a front view of the scanner.
The scanner 10 of the present embodiment, as an image reading device, reads an image of a read original and acquires image data.

  As shown in FIGS. 3A and 3B, the scanner 10 includes a flat bed unit 11, a scanner cover 12, and an ADF (automatic document feeder) unit 13.

  As shown in FIG. 3B, the flat bed unit 11 is provided with a flat bed 14 as a document table for placing a read document. In this embodiment, it is possible to place an indeterminate type reading document on the flat bed 14. The upper surface of the flat bed 14 is covered with an openable / closable scanner cover 12, and the user opens the scanner cover 12 and places the original to be read on the flat bed 14 so that the reading surface faces downward. To do.

  A movable carriage 15 is provided below the flat bed 14. The carriage 15 is locked at the home position shown in FIG. 3B when locked by a lock lever described later, and can run along the flat bed 14 when unlocked.

  As shown in FIG. 3B, the light source 16, a plurality of mirrors 17, a lens 18, and a reading sensor 19 are mounted on the carriage 15 to form an image reading unit.

  The light source 16 is made of a fluorescent lamp, for example, and irradiates light on the reading surface of the read original. The mirror 17 and the lens 18 form a reduction optical system, and form a reduced image of the read original on the reading sensor 19 based on the reflected light from the read original. The reading sensor 19 includes a CCD unit, for example, and photoelectrically converts a reduced image that has been formed to acquire image data.

  Here, the flow of reading the image of the read document placed on the flat bed 14 and acquiring the image data will be briefly described.

  The carriage 15 travels from the home position at a constant speed in the sub-scanning direction indicated by the arrow A in FIG. Along with this traveling, the reading sensor 19 mounted on the carriage 15 sequentially reads and reads the image of the reading document placed on the flat bed 14 for each line in the main scanning direction perpendicular to the sub-scanning direction. Image data corresponding to the entire document is acquired. When the acquisition of the image data is completed, the carriage 15 returns to the home position and stops.

  The ADF unit 13 is provided above the scanner cover 12 as shown in FIGS. 3 (a) and 3 (b). As shown in FIG. 3B, the ADF unit 13 is provided with a document tray 21 on which the sheet-shaped read document 20 is placed. The ADF unit 13 inverts a plurality of read originals 20 placed on the original tray 21 one by one through a groove 12 a provided in the scanner cover 12 and conveys them to the upper surface of the scanner cover 12. It has the function to do.

  The groove 12 a of the scanner cover 12 is provided above the home position of the carriage 15 so that the light from the light source 16 is irradiated on the read original 20 so that the read sensor 20 can read the read original 20. It is done.

  On the document tray 21 of the ADF unit 13, a document presence / absence sensor 22 for detecting the presence / absence of the read document 20 is disposed.

  The plurality of read originals 20 placed on the original tray 21 are separated one by one by the ADF roller 23. Each separated read document 20 is transported along the document travel route 25 by the transport roller 24 along the document travel route 25, is reversed via the groove 12 a of the scanner cover 12, and is then scanned by the discharge roller 26. It is discharged onto the cover 12.

  A passage detection sensor 27 for detecting the passage of the read document 20 is disposed on the document travel route 25 in the ADF unit 13 as shown in FIG.

  Here, the flow of reading the image of the read original conveyed by the ADF unit 13 and acquiring the image data will be briefly described.

  While each read document 20 is being conveyed by the ADF unit 13, the carriage 15 is stationary at the home position as shown in FIG. When the read original 20 passes over the passage detection sensor 27, the light source 16 located below the groove 12a is turned on based on the detection signal from the passage detection sensor 27. Then, the reading sensor 19 reads the image of the read original 20 line by line while obtaining a still state, and acquires image data.

  A carriage locking device for locking the carriage 15 is provided inside the flat bed unit 11 of the scanner 10.

Here, a detailed configuration of the carriage locking device of the present embodiment will be described.
FIG. 1 is a configuration diagram of a carriage locking device according to the first embodiment of the present invention, and FIG. 2 is a partial configuration diagram of the carriage locking device according to the first embodiment of the present invention.

  1A is a diagram corresponding to the time when the carriage 15 is locked, and FIG. 2 is a view of the carriage locking device 41 from the direction of arrow B (FIG. 1A). FIG. 1B is a diagram corresponding to the unlocking of the carriage 15, and FIG. 1C is a diagram corresponding to the relocking of the carriage 15.

  Inside the carriage locking device 41, a pair of pulleys 28 are provided at both ends in the main scanning direction. In FIG. 1A to FIG. 1C, only one pulley 28 is shown. The pulley 28 is attached to one end of the pulley shaft 29, is driven based on power supplied from a motor (not shown) as a drive source, and rotates together with the pulley shaft 29. An idle gear 30 is attached to the other end portion of the pulley shaft 29 and rotates together with the pulley 28 and the pulley shaft 29.

  A belt 31 is wound around the pulley 28. The belt 31 is stretched in the sub-scanning direction in parallel along the flat bed 14. Further, the carriage 15 on which the reading sensor 19 is mounted is attached to the belt 31 via an attachment portion 15b. The belt 31 supports the carriage 15 and travels in the sub-scanning direction together with the carriage 15 below the flat bed 14 as the pulley 28 rotates. That is, the pulley 28 and the belt 31 function as a power transmission unit that transmits power from the motor to the carriage 15 on which the reading sensor 19 is mounted, and drives the carriage 15.

  In the present embodiment, the motor drives the pulley 28, but it is also possible to adopt a configuration in which the belt 31 is driven. In this case, as the belt 31 is driven, the pulley 28, the pulley shaft 29, and the idle gear 30 rotate.

  As shown in FIG. 1A, the carriage 15 has a notched groove 15a as a locked portion. A protrusion 32a of a lock lever 32 as a locking member engages with the groove 15a of the carriage 15 when stationary at the home position shown in FIG.

  The lock lever 32 has a rotation shaft 32b that is fixed to a casing (hereinafter referred to as an apparatus casing) of the carriage locking device 41, and is rotatably attached around the rotation shaft 32b. At one end of the lock lever 32, a claw-shaped protrusion 32a protrudes in the direction of the carriage 15, and the protrusion 32a engages with the groove 15a of the carriage 15 so that the carriage 15 is immovably locked. To do.

  Around the lock lever 32, a stopper 33 and a stopper 34 for restricting the position of the lock lever 32 are formed integrally with the apparatus housing. The stopper 33 restricts the position of the lock lever 32 when the carriage 15 shown in FIG. Further, the stopper 34 regulates the position of the lock lever 32 when the lock shown in FIG.

  Further, a substantially L-shaped spring 35 is disposed around the lock lever 32 so that the central portion thereof is hung on the rotation shaft 32 b of the lock lever 32. One end of the spring 35 is supported by a stopper 36 formed in the apparatus housing, and the other end is fixed to the lock lever 32. The spring 35 constantly urges the lock lever 32 in the direction of the carriage 15 as an urging member as indicated by an arrow C in FIG.

  A cam 37 as a release member is provided between the lock lever 32 and the pulley 28 of the flat bed unit 11 as shown in FIG. As shown in FIG. 2, the cam 37 is attached to the end of a camshaft 38 that is shorter than the pulley shaft 29. Further, as shown in FIG. 2, a cam drive gear 39 that meshes with the idle gear 30 is attached to the other end portion of the camshaft 38. The cam drive gear 39 rotates following the rotation of the idle gear 30. That is, the pulley 28, the pulley shaft 29, and the idle gear 30 function as a power transmission unit and transmit power from the motor to a cam 37 serving as a release member.

  The camshaft 38 has a torque limiter function, and stops rotating when the torque generated by the power transmitted to the idle gear 30 through the cam drive gear 39 exceeds a predetermined threshold as a power cut-off portion.

  A stopper 40 for restricting the position of the cam 37 is formed integrally with the apparatus housing around the cam 37. As shown in FIG. 1A, the stopper 40 regulates the position of the cam 37 so as to maintain the contact state between the cam side end portion 32 c of the lock lever 32 and the contact portion 37 a of the cam 37. .

  Next, operations of the scanner 10 and the carriage locking device 41 of this embodiment will be described.

  Before the scanner 10 is turned on and after the power is turned on, until the image reading process of the read document placed on the flat bed 14 is started, that is, in the standby state of the scanner 10, the pulley from the motor (not shown) The power supply to 28 is stopped. At this time, the pulley 28 and the belt 31 are stationary, and the carriage 15 is stationary at the home position as shown in FIG.

  When stationary at the home position, the groove 32 a of the carriage 15 is engaged with the protrusion 32 a of the lock lever 32. In this state, the lock lever 32 is biased by the spring 35 and locks the carriage 15 so as not to move in a state where the lock lever 32 is in contact with the stopper 33 (FIG. 1A).

  In this standby state, for example, when a read document is placed on the document tray 21 of the ADF unit 13 and the image reading process is started, the scanner 10 moves the carriage 15 to the home position as shown in FIG. Each read document is conveyed to the ADF unit 13 while being kept stationary at the position. Then, the reading sensor 19 mounted on the carriage 15 reads the image of each read document while still and acquires image data. During the execution of the image reading process, in the carriage locking device 41, the carriage 15 is locked so as not to move by the lock lever 32 at the home position, as in the standby state (FIG. 1A).

  Further, in the standby state, for example, when the image reading process of the read document placed on the flat bed 14 is started, the scanner 10 starts supplying power to the pulley 28 by the motor. The pulley 28 rotates counterclockwise (arrow D) based on the power from the motor (FIG. 1B).

  When the pulley 28 starts to rotate, the pulley shaft 29 and the idle gear 30 rotate together with the pulley 28. Then, the cam drive gear 39 receives power from the meshing idle gear 30 and starts rotating in the opposite direction to the idle gear 30. Along with the rotation of the cam drive gear 39, the cam shaft 38 and the cam 37 rotate in the opposite direction to the pulley 28, that is, in the clockwise direction (arrow E) (FIG. 1B).

  When the cam 37 rotates, the contact portion 37a of the cam 37 presses the cam side end portion 32c of the lock lever 32, as shown in FIG. Based on this pressing force, the lock lever 32 rotates around the rotation shaft 32b against the urging force from the spring 35 as indicated by an arrow F. Thereby, the protrusion 32a of the lock lever 32 is disengaged from the groove portion 15a of the carriage 15, and the carriage locking device 41 releases the lock of the carriage 15 by the lock lever 32 (FIG. 1B).

  The belt 31 travels in the sub-scanning direction as the pulley 28 rotates. Then, the carriage 15 unlocked by the lock lever 32 starts traveling in the sub-scanning direction (arrow A) together with the belt 31 (FIG. 1B).

  Then, the reading sensor 19 mounted on the carriage 15 reads the image of the read document on the flat bed 14 while traveling at a constant speed in the sub-scanning direction from the home position, and acquires image data.

  As shown in FIG. 1B, the lock lever 32 stops rotating against the pressing force from the cam 37 when it comes into contact with the stopper 34. At this time, since the cam 37 cannot rotate, a torque exceeding a predetermined threshold is generated on the cam shaft 38. As a result, the torque limiter function of the camshaft 38 is activated, and the camshaft 38 stops rotating. The cam drive gear 39 continues to rotate as indicated by the arrow E.

  When reading of the image of the read original is completed, the scanner 10 stops the power supply to the pulley 28 by the motor. As a result, the rotation of the pulley 28 is stopped, the rotation of the pulley shaft 29, the idle gear 30 and the cam drive gear 39 is stopped, and the running of the belt 31 and the carriage 15 is stopped. Further, the operation of the torque limiter function of the camshaft 38 is released.

  Subsequently, the scanner 10 supplies power to the pulley 28 by a motor so as to reversely rotate the pulley 28. The pulley 28 rotates in the clockwise direction (arrow D ′), and the belt 31 and the carriage 15 travel in the arrow A ′ direction (FIG. 1C).

  Further, the pulley shaft 29 and the idle gear 30 rotate together with the pulley 28, and the cam drive gear 39 rotates in accordance with the power transmission from the idle gear 30 that meshes. Thereby, the camshaft 38 and the cam 37 rotate counterclockwise (arrow E ′) (FIG. 1C).

  As the cam 37 rotates, the pressing force applied from the contact portion 37a to the cam side end portion 32c of the lock lever 32 decreases. Then, the lock lever 32 rotates around the rotation shaft 32 b based on the urging force of the spring 35.

  As shown in FIG. 1C, when the cam 37 comes into contact with the stopper 40 and cannot rotate, the torque limiter function of the camshaft 38 is activated, and the camshaft 38 stops rotating. When the rotation of the cam 37 and the camshaft 38 is stopped, the lock lever 32 is held in position by the stopper 33 in a state where the cam side end portion 32c is in contact with the contact portion 37a of the cam 37 and stops rotating. .

  Even after the rotation of the cam 37 and the camshaft 38 is stopped, the rotation of the pulley 28 continues. The belt 31 and the carriage 15 continue to travel in the direction of the arrow A ′, and when the carriage 15 approaches the home position, the carriage 15 collides with the protrusion 32a of the lock lever 32 as shown in FIG. .

  The carriage 15 continues to travel after the collision with the protrusion 32a. The lock lever 32 rotates in the direction of arrow F against the urging force from the spring 35 when the projection 32a is pressed by the carriage 15 (FIG. 1C). Thereafter, when the groove portion 15a of the carriage 15 reaches the position of the protrusion 32a, the lock lever 32 rotates in the reverse direction of the arrow F based on the urging force from the spring 35, and the protrusion 32a enters the groove portion 15a and engages. To do.

  When the carriage 15 reaches the home position, the scanner 10 stops supplying power to the pulley 28 by the motor. As a result, the rotation of the pulley 28 is stopped, the rotation of the pulley shaft 29, the idle gear 30 and the cam drive gear 39 is stopped, and the traveling of the belt 31 and the carriage 15 is stopped. In the carriage locking device 41, the carriage 15 that has been unlocked is stopped at the home position and is re-locked by the lock lever 32 so as not to move (FIG. 1A). Further, the operation of the torque limiter function of the camshaft 38 is released.

  As described above, the carriage locking device according to the present embodiment always locks the carriage so that the carriage cannot be moved when the carriage is not driven, regardless of whether the scanner is turned on. Even in this case, it is possible to prevent the reading sensor from being damaged and the accuracy from being lowered by the movement of the carriage. Even if the user does not operate, the carriage is automatically unlocked when the carriage is driven, and automatically re-locked when the carriage is finished. The risk of affecting is avoided.

FIG. 4 is a configuration diagram of the carriage locking device according to the second embodiment of the present invention, and FIG. 5 is a partial configuration diagram of the carriage locking device according to the second embodiment of the present invention.
The carriage locking device 50 of this embodiment is different from that of the first embodiment in the shape and operation of a lock lever 51 as a locking member that locks the carriage 15.
In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  FIG. 4A is a view corresponding to the time when the carriage 15 is locked, and FIG. 5 is a view as seen from the direction of the arrow B shown in FIG. 4B is a diagram corresponding to when the carriage 15 is unlocked, and FIG. 4C is a diagram corresponding to when the carriage 15 is re-locked.

  As shown in FIG. 4A to FIG. 4C, the lock lever 51 has two guides 51b made of elliptical holes. These guides 51b are respectively engaged with stoppers 55 formed integrally with the device housing of the carriage locking device 50 to hold the lock lever 51 movably.

  At the end of the lock lever 51 on the carriage 15 side, a claw-shaped protrusion 51a protrudes toward the carriage 15, and the protrusion 51a engages with the groove 15a of the carriage 15 as shown in FIG. The carriage 15 is locked so as not to move. At this time, the stopper 55 engaged with each guide 51b abuts against the inner wall of the guide 51b to restrict the position of the lock lever 51 (FIG. 4A).

  Further, a rack-shaped portion 51d is provided at the other end of the lock lever 51, as shown in FIGS. 4 (a) to 4 (c).

  Around the lock lever 51, a stopper 56 for regulating the position of the lock lever 51 is formed integrally with the apparatus housing. The stopper 56 regulates the position of the lock lever 51 when the carriage 15 is unlocked as shown in FIG.

  A spring 57 is further provided between the stopper 56 and the lock lever 51. The spring 57 is fixed to the stopper 56 at one end and the groove 51c of the lock lever 51 at the other end in a contracted state compared to the natural length. The spring 57, as an urging member, constantly urges the lock lever 51 in the direction of the carriage 15 as indicated by an arrow G in FIG.

  The carriage locking device 50 is further provided with a pulley 52. As shown in FIG. 5, the pulley 52 is attached to one end of the pulley shaft 53 and is driven and rotated based on power supplied from a motor (not shown) as a drive source. As shown in FIG. 5, an idle gear 54 as a release member is attached to the other end portion of the pulley shaft 53 and rotates together with the pulley shaft 53 as a power transmission portion.

  A belt 31 is wound around the pulley 52. The belt 31 supports the carriage 15 and travels in the sub-scanning direction together with the carriage 15 as the pulley 52 rotates. That is, the pulley 52 and the belt 31 serve as a power transmission unit, and transmits power from the motor to the carriage 15 to drive the carriage 15.

  In this embodiment, the motor drives the pulley 52, but it is also possible to adopt a configuration in which the belt 31 is driven.

  The pulley shaft 53 has a torque limiter function that stops rotation when the torque exceeds a predetermined threshold as a power shut-off unit.

  As shown in FIG. 5, the rack-shaped portion 51 d of the lock lever 51 is engaged with the idle gear 54. When the idle gear 54 rotates together with the pulley 52 and the pulley shaft 53, the lock lever 51 receives power from the idle gear 54 via the rack-shaped portion 51d as a contact portion, and makes contact with and away from the carriage 15. Move in the direction.

  Next, the carriage locking device 50 of this embodiment and the operation of the scanner on which the carriage locking device 50 is mounted will be described.

  In the standby state of the scanner, power supply from the motor (not shown) to the pulley 52 is stopped. At this time, the pulley 52 and the belt 31 are stationary, and the carriage 15 is stationary at the home position as shown in FIG.

  When stationary at the home position, the protrusion 51 a of the lock lever 51 is engaged with the groove 15 a of the carriage 15. The lock lever 51 is biased by the spring 57 and locks the carriage 15 so as not to move in a state where the stopper 55 is in contact with the inner wall of the guide 51b (FIG. 4A).

  In this standby state, when the image reading process of the read document placed on the flat bed 14 is started, the scanner starts supplying power to the pulley 52 by the motor. The pulley 52 rotates in the counterclockwise direction (arrow D) based on the power from the motor (FIG. 4B).

  When the pulley 52 starts to rotate, the pulley shaft 53 and the idle gear 54 rotate together with the pulley 52. When the rack-shaped portion 51 d of the lock lever 51 receives power from the meshing idle gear 54, the lock lever 51 is against the urging force from the spring 57 in the direction indicated by the arrow H, that is, the carriage 15. Move in the direction of separation. With this movement, the protrusion 51a of the lock lever 51 is disengaged from the groove 15a of the carriage 15, and the lock of the carriage 15 by the lock lever 51 is released (FIG. 4B).

  As the pulley 52 rotates, the belt 31 travels in the sub-scanning direction as shown in FIG. Then, the carriage 15 unlocked by the lock lever 51 starts traveling in the sub-scanning direction (arrow A) together with the belt 31.

  A reading sensor 19 (FIG. 3) mounted on the carriage 15 reads an image of a read document on the flat bed 14 while traveling at a constant speed in the sub-scanning direction from the home position, and acquires image data.

  When the lock lever 51 comes into contact with the stopper 56, the lock lever 51 stops moving in the arrow H direction against the power transmitted from the idle gear 54 (FIG. 4B). At this time, torque exceeding a predetermined threshold is generated in the pulley shaft 53, and the torque limiter function is activated. As a result, the pulley shaft 53 and the idle gear 54 stop rotating. The pulley 52 continues to rotate, and the belt 31 continues to travel in the sub-scanning direction.

  When reading of the image of the read original is completed, the scanner stops the power supply to the pulley 52 by the motor. As a result, the rotation of the pulley 52 stops and the traveling of the belt 31 and the carriage 15 stops. Further, the operation of the torque limiter function of the pulley shaft 53 is released.

  Subsequently, the scanner supplies power to the pulley 52 by a motor so as to reversely rotate the pulley 52. The pulley 52 rotates in the clockwise direction (arrow D ′), and the belt 31 and the carriage 15 travel in the direction of arrow A ′ (FIG. 4C).

  Further, when the pulley shaft 53 and the idle gear 54 rotate together with the pulley 52 and the rack-shaped portion 51d of the lock lever 51 receives power from the meshing idle gear 54, the lock lever 51 is shown in FIG. c) Moves in the direction opposite to the arrow H shown in FIG.

  When the inner wall of the guide 51b comes into contact with the stopper 55, the lock lever 51 cannot move and stops. Along with this, the torque limiter function of the pulley shaft 53 operates, and the pulley shaft 53 and the idle gear 54 stop rotating. The pulley 52 continues to rotate, and the belt 31 and the carriage 15 continue to travel in the arrow A ′ direction.

  When the carriage 15 approaches the home position and collides with the protrusion 51a of the lock lever 51 as shown in FIG. 4C, the lock lever 51 moves in the direction of arrow H based on the pressing force from the carriage 15. To do. Thereafter, when the groove portion 15a of the carriage 15 reaches the position of the protrusion 51a, the lock lever 51 moves in the reverse direction of the arrow H based on the elastic force from the spring 57, and the protrusion 51a enters the groove portion 15a and engages. Match.

  When the carriage 15 reaches the home position, the scanner stops supplying power to the pulley 52 by the motor. Thereby, the rotation of the pulley 52 is stopped, and the running of the belt 31 and the carriage 15 is stopped. The carriage 15 stops at the home position and is locked so as not to move by the lock lever 51 (FIG. 4A). Further, the operation of the torque limiter function of the pulley shaft 53 is released.

  As described above, the carriage locking device according to the present embodiment can lock and unlock the carriage without providing a cam or the like between the pulley and the lock lever. it can. In addition, by providing a rack-shaped portion on the lock lever and meshing the rack-shaped portion with the idle gear, the rotational force from the pulley can be converted into linear power, so that the lock lever can be locked and unlocked. It becomes possible to carry out with more reliable linear motion.

FIG. 6 is a configuration diagram (No. 1) of the carriage locking device according to the third embodiment of the present invention, and FIG. 7 is a configuration diagram (No. 2) of the carriage locking device according to the third embodiment of the present invention. is there.
The carriage locking device 60 of this embodiment is different from that of the first embodiment in that a pair of lock levers 66 and 67 is provided and a protrusion 62 a is provided on the belt 62.
In the present embodiment, the same components as those in the first embodiment or the second embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  FIG. 6A is a diagram corresponding to when the carriage 61 is locked, and FIG. 6B is a diagram corresponding to when the carriage 61 is unlocked. FIGS. 7A and 7B are diagrams corresponding to the case where the carriage 61 is re-locked.

  The carriage 61 has a groove portion 61a as a locked portion, and is attached to the belt 62 via an attachment portion 61b.

  As shown in FIGS. 6 (a) and 6 (b), the belt 62 is wound around idle rollers 63, 64 and 65, and based on power supplied from a motor as a drive source (not shown). Along with the carriage 61, the vehicle travels below the flat bed 14 in the sub scanning direction. That is, the belt 62 is driven by transmitting power to the carriage 61 as a power transmission unit.

  A protrusion 62 a is provided on the surface of the belt 62. The protrusion 62 a is positioned between the idle roller 64 and the lock lever 67 as shown in FIG. 6A when the carriage 61 is locked.

  Further, the carriage locking device 60 of the present embodiment is provided with two lock levers, that is, a lock lever 66 and a lock lever 67 as described above.

  The lock lever 66 is rotatably attached to a rotation shaft 68 fixed to the device housing of the carriage locking device 60 as a locking member for locking the carriage 61. A claw-shaped protrusion 66 a is provided at one end of the lock lever 66 so as to protrude toward the groove 61 a of the carriage 61. The protrusion 66a engages with the groove 61a to lock the carriage 61 so that it cannot move.

  Around the lock lever 66, a stopper 69 for restricting the position of the lock lever 66 is formed integrally with the apparatus housing. The stopper 69 abuts against the lock lever 66 when the carriage 61 shown in FIG.

  The lock lever 67 is rotatably attached to the same rotation shaft 68 as the lock lever 66 as a release member for releasing the locking of the carriage 61 by the lock lever 66. The lock lever 67 is positioned between the lock lever 66 and the idle roller 64, and when the carriage 61 is locked by the lock lever 66, the side surface abuts against the lock lever 66 and the tip as shown in FIG. The portion 67a contacts the belt 62.

  Further, a substantially L-shaped spring 70 and a spring 71 are disposed on the rotation shaft 68 so as to hang around the center portion.

  One end of the spring 70 is supported by a stopper 72 formed on the casing of the flat bed unit, and the other end is fixed to the lock lever 66. The spring 70 as a biasing member constantly biases the lock lever 66 in the direction of the carriage 61 and the lock lever 67 as indicated by an arrow I in FIG.

  One end of the spring 71 is supported by a stopper 73 formed on the casing of the flat bed unit, and the other end is fixed to the lock lever 67. The spring 71 constantly biases the lock lever 67 toward the lock lever 66.

  Next, the operation of the carriage locking device 60 of this embodiment and the scanner on which the carriage locking device 60 is mounted will be described.

  In the standby state of the scanner, power supply from the motor (not shown) to the belt 62 is stopped. At this time, the carriage 61 is stationary at the home position, as shown in FIG.

  When stationary at the home position, the protrusion 66 a of the lock lever 66 is engaged with the groove 61 a of the carriage 61. At this time, the lock lever 66 is urged by the spring 70 and locks the carriage 61 so as not to move while being in contact with the stopper 69 (FIG. 6A).

  In this standby state, when the image reading process of the read document placed on the flat bed 14 is started, the scanner starts supplying power to the belt 62 by the motor. The belt 62 starts traveling as indicated by an arrow J based on the power from the motor (FIG. 6B). The idle rollers 63 and 64 are driven and rotated counterclockwise as the belt 62 travels, and the idle roller 65 is driven and rotated clockwise (FIG. 6B).

  When the protrusion 62a of the belt 62 collides with the tip 67a of the lock lever 67, the lock lever 67 is pressed by the protrusion 62a and rotates in the direction of the arrow K together with the abutting lock lever 66 (FIG. 6 ( b)). The lock lever 66 rotates against the urging force from the spring 70, and the protrusion 66 a is engaged and disengaged from the groove 61 a of the carriage 61. As a result, the carriage 61 is unlocked by the lock lever 66 (FIG. 6B).

  The unlocked carriage 61 travels with the belt 62 in the sub-scanning direction (arrow A). The reading sensor mounted on the carriage 61 reads the image of the read original on the flat bed 14 while traveling at a constant speed in the sub-scanning direction from the home position, and acquires image data.

  When the belt 62 further travels and the protrusion 62a is separated from the lock lever 67, the lock lever 67 and the lock lever 66 are released from the pressing force from the protrusion 62a. Based on the urging force from the spring 70, the lock lever 66 presses the abutting lock lever 67 and rotates in the direction opposite to the arrow K until it abuts against the stopper 69 (FIG. 6B). Thereby, the lock lever 66 and the lock lever 67 return to the positions before unlocking.

  When reading of the image of the read original is completed and the power supply to the belt 62 by the motor is stopped, the running of the belt 62 and the carriage 61 is stopped. Thereafter, the scanner supplies power to the belt 62 by a motor so that the belt 62 travels in the reverse direction. As shown in FIG. 7A, the belt 62 travels in the direction of the arrow J ′, and the carriage 61 travels in the direction of the arrow A ′. Further, the idle rollers 63, 64 and 65 are driven to rotate as the belt 62 travels.

  When the carriage 61 approaches the home position, the carriage 61 collides with the protrusion 66a of the lock lever 66 as shown in FIG. The lock lever 66 is pushed in the direction of the arrow K against the urging force from the spring 70 when the projection 66a is pressed by the traveling carriage 61 (FIG. 7A). Thereafter, when the groove 61a of the carriage 61 reaches the position of the protrusion 66a, the lock lever 66 rotates in the reverse direction of the arrow K based on the urging force from the spring 70, and the protrusion 66a enters the groove 61a and engages. To do.

  When the protrusion 62a collides with the tip end portion 67a of the lock lever 67 as the belt 62 travels, the lock lever 67 resists the urging force from the spring 71 as shown in FIG. It rotates in the clockwise direction, that is, in the direction away from the lock lever 66. Thereafter, when the protrusion 62a is separated from the lock lever 67, the lock lever 67 rotates counterclockwise based on the urging force from the spring 71, and the side surface portion comes into contact with the lock lever 67 and stops (FIG. 6 ( a)).

  When the carriage 61 reaches the home position, the scanner 10 stops the power supply to the belt 62 by the motor. Thereby, the running of the belt 62 and the carriage 61 is stopped. The carriage 61 is re-locked by the lock lever 66 so as not to move (FIG. 6A).

  As described above, the scanner of this embodiment is provided with a lock lever as a release member in addition to a lock lever as a locking member, and a protrusion is formed on the belt surface, so that a torque limiter mechanism is not provided. In both cases, power transmission to each lock lever can be interrupted in a timely manner. Therefore, stable use is possible.

FIG. 8 is a block diagram of a carriage locking device according to Embodiment 4 of the present invention.
The carriage locking device 80 of the present embodiment is different from the first, second, and third embodiments in that the carriage 81 that does not have a notch shape is locked by two lock levers 82 and 83.
In the present embodiment, the same components as those in the first to third embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

  FIG. 8A is a diagram corresponding to when the carriage 81 is locked, and FIG. 8B is a diagram corresponding to when the carriage 81 is unlocked. FIG. 8C is a diagram corresponding to the case where the carriage 81 is re-locked.

  The carriage 81 is attached to the belt 84 via the attachment portion 81b.

  The belt 84 is wound around a pulley 85 and travels below the flat bed 14 in the sub-scanning direction together with the carriage 81 based on power supplied from a motor (not shown). That is, the belt 84 is driven by transmitting power to the carriage 81 as a power transmission unit.

  The pulley 85 receives power from the belt 84 and rotates. The pulley 85 is attached to one end of the pulley shaft 86 as in the first and second embodiments. An idle gear 87 is attached to the other end of the pulley shaft 86 and rotates together with the pulley shaft 86.

  When the carriage 81 is locked, the idle gear 87 is engaged with the rack-shaped portion 82d of the lock lever 82 as shown in FIG.

  The lock lever 82 is substantially L-shaped in this embodiment, and, as described above, the rack-shaped rack-shaped portion 82d is provided at the end on the idle gear 87 side. In addition, the lock lever 82 has a guide 82b made of an elliptical hole, as shown in FIGS. 8 (a) to 8 (c). A stopper 88 formed integrally with the device housing of the carriage locking device 80 is engaged with the guide 82b, and the lock lever 82 is supported so as to be movable in the contact / separation direction with the pulley 85.

  Furthermore, a groove-shaped engaging portion 82 c is provided at a corner portion of the lock lever 82. As shown in FIG. 8A, the movable iron core 89a of the solenoid 89 is engaged with the engaging portion 82c.

  Between the solenoid 89 and the lock lever 82, the spring 90 is fixed to the lock lever 82 at one end and the solenoid 89 at the other end in a contracted state compared to the natural length. The movable iron core 89a passes through the spring 90 and engages with the engaging portion 82c of the lock lever 82, as shown in FIG.

  As a biasing member, the spring 90 constantly biases the lock lever 82 in the proximity direction to the idle gear 87, that is, in the direction of the arrow L shown in FIG. When the carriage 81 shown in FIG. 8A is locked, the lock lever 82 meshes the rack-shaped portion 82d with the idle gear 87 based on the urging force from the spring 90, and the idle gear 87 is not rotated. Hold as possible.

  Further, as shown in FIGS. 8A to 8C, a claw-shaped protrusion 82a is provided at the end of the lock lever 82 on the carriage 81 side so as to protrude toward the lock lever 83.

  Further, as shown in FIGS. 8A to 8C, a pair of stoppers 91a and 91b are integrally formed around the lock lever 82 with the apparatus housing. These stoppers 91 a and 91 b regulate the position of the lock lever 82.

  In this embodiment, the lock lever 83 is positioned between the protrusion 82a of the lock lever 82 and the belt 84 as shown in FIGS. 8A to 8C, and the claw-shaped protrusion 83a is locked. It is formed to protrude in the direction of the lever 82. The lock lever 83 has a guide 83b made of an elliptical hole. A stopper 92 formed integrally with the apparatus housing is engaged with the guide 83b, and the lock lever 83 is supported so as to be movable in the contact / separation direction with the carriage 81.

  The lock lever 83 is also provided with a groove-shaped engaging portion 83c. As shown in FIG. 8A, one end of the spring 93 is fixed to the engaging portion 83c in a contracted state as compared with the natural length. The other end of the spring 93 is fixed to a stopper 94 formed integrally with the apparatus housing. As a biasing member, the spring 93 constantly biases the lock lever 83 in the proximity to the carriage 81, that is, in the direction of the arrow M shown in FIG. The carriage-side end 83d of the lock lever 83 abuts against the side surface of the carriage 81 when the carriage 81 is locked as shown in FIG.

  Furthermore, as shown in FIGS. 8A to 8C, stoppers 95 and 96 are formed integrally with the apparatus housing around the lock lever 83. These stoppers 95 and 96 restrict the position of the lock lever 83.

  Next, the carriage locking device 80 of this embodiment and the operation of the scanner on which the carriage locking device 80 is mounted will be described.

  In the standby state of the scanner, power supply from the motor (not shown) to the belt 84 is stopped. At this time, the carriage 81 is stationary at the home position as shown in FIG.

  When the carriage 81 is stationary at the home position, the lock lever 82 is urged by the spring 90, and the idle gear 87, the pulley shaft 86, and the pulley 85 are not rotated while the rack-shaped portion 82d is engaged with the idle gear 87. It is fixed, that is, locked (FIG. 8 (a)). Further, the lock lever 83 is fixed, that is, locked so that the protrusion 83a engages with the protrusion 82a of the lock lever 82 and resists the urging force from the spring 93 (FIG. 8A).

  That is, the carriage locking device 80 of this embodiment locks the belt 84 and the carriage 81 so that they cannot move by locking the idle gear 87 with the lock lever 82.

  In this standby state, when the image reading process of the read document placed on the flat bed 14 is started, the scanner first starts energizing the solenoid 89. Accompanying this energization, a suction force to the inside of the solenoid 89 acts on the movable iron core 89a of the solenoid 89. The movable iron core 89a moves in the direction of the arrow L ′ together with the lock lever 82 based on this suction force (FIG. 8B). The rack-shaped portion 82d of the lock lever 82 is separated from the idle gear 87, and the lock of the idle gear 87 is released (FIG. 8B).

  Further, the scanner starts power supply of the belt 84 by the motor. The belt 84 starts running based on the power from the motor. As the belt 84 travels, the pulley 85 and the pulley shaft 86, the unlocked idle gear 87, and the pulley 85 and the pulley shaft 86 are driven to rotate counterclockwise (FIG. 8B).

  The carriage 81 travels with the belt 84 in the sub-scanning direction (arrow A) (FIG. 8B). A reading sensor mounted on the carriage 81 reads an image of a reading document on the flat bed 14 and acquires image data while traveling at a constant speed in the sub-scanning direction from the home position.

  In the lock lever 83, the projection 83a is engaged and disengaged from the projection 82a as the energization of the solenoid 89 starts and the carriage 81 travels. That is, the lock lever 83 is unlocked by the lock lever 82. The lock lever 83 moves in the direction of the arrow M based on the urging force from the spring 93, and when the stopper 92 comes into contact with the inner wall of the guide 83b on the engaging portion 83c side, the lock lever 83 is held by the stopper 92. Stop. At this time, the tip of the protrusion 83a of the lock lever 83 is in contact with the tip of the protrusion 82a of the lock lever 82 (FIG. 8B).

  Subsequently, the scanner stops energizing the solenoid 89. At this time, the suction force acting on the movable iron core 89 a of the solenoid 89 is removed, but the position of the lock lever 82 is fixed in a state where the protrusion 82 a is in contact with the protrusion 83 a of the lock lever 83.

  When the reading of the image of the read original is completed and the power supply to the belt 84 by the motor is stopped, the running of the belt 84 and the carriage 81 and the rotation of the pulley 85, the pulley shaft 86, and the idle gear 87 are stopped. Thereafter, the scanner supplies power to the belt 84 by a motor so that the belt 84 travels in the reverse direction. As a result, the belt 84 travels in the direction of the arrow A ′ together with the carriage 81 (FIG. 8C). Further, the pulley 85, the pulley shaft 86, and the idle gear 87 are driven to rotate clockwise as the belt 84 travels (FIG. 8C).

  When the carriage 81 approaches the home position, the carriage 81 collides with the carriage side end 83d of the lock lever 83 as shown in FIG. The lock lever 83 is pressed by the traveling carriage 81 and moves in the arrow M ′ direction against the urging force from the spring 93 (FIG. 8C).

  As the lock lever 83 moves, when the contact state between the protrusion 83a of the lock lever 83 and the protrusion 82a of the lock lever 82 is released, the lock lever 82 is moved by the arrow L based on the biasing force from the spring 90. As shown, it moves toward the idle gear 87. Further, the lock lever 83 continues to move against the biasing force from the spring 93 until the lock lever 83 is pressed by the carriage 81 and the stopper 92 contacts the inner wall of the guide 83b on the carriage 81 side.

  When the rack-shaped portion 82d of the lock lever 82 meshes with the idle gear 87, the idle gear 87 is re-locked so as not to rotate (FIG. 8A). Thereby, the rotation of the pulley shaft 86 and the pulley 85 is stopped, and the running of the belt 84 is also stopped. The lock lever 83 is held by the stopper 92 and is re-locked by the lock lever 82 in a state where the protrusion 83a is engaged with the protrusion 82a of the lock lever 82 (FIG. 8A). The scanner stops the power supply to the belt 84 by the motor, and the carriage 81 stops at the home position (FIG. 8A).

  As described above, the carriage locking device of this embodiment can lock the pulley and the belt by meshing the rack-shaped portion provided on the lock lever with the idle gear, so that the carriage is not directly locked. Both can be kept immovable. In addition, since a solenoid is used to drive the lock lever, it is possible to eliminate a time lag between carriage travel and motor operation.

  In the carriage locking device of this embodiment, it is also possible to provide a groove as a locked portion on the carriage and engage the protrusion of the lock lever in the groove to directly lock the carriage. An example is shown below.

FIG. 9 is a configuration diagram showing a modification of the carriage locking device according to the present invention.
FIG. 9A is a diagram corresponding to when the carriage 101 is locked, and FIG. 9B is a diagram corresponding to when the carriage 101 is unlocked. FIG. 9C is a diagram corresponding to the case where the carriage 101 is re-locked.

  In the carriage locking device 100, the carriage 101 has a groove portion 101a and is attached to the belt 84 via the attachment portion 101b.

  The lock lever 102 is provided with a rack-shaped portion 102d at an end on the idle gear 87 side, and a rack-shaped portion 102d that can mesh with the idle gear 87 and lock the idle gear 87 is provided. The lock lever 102 has a guide portion 102b with which the stopper 88 is engaged.

  Further, the lock lever 102 is provided with a groove-shaped engaging portion 102 c to engage the movable iron core 89 a of the solenoid 89.

  Between the solenoid 89 and the lock lever 102, a spring 90 that constantly biases the lock lever 102 in the proximity direction to the idle gear 87 is disposed.

  The lock lever 102 is also provided with a claw-shaped protrusion 102 a that engages with the protrusion 83 a of the lock lever 83 and locks the lock lever 83 so as to protrude toward the lock lever 83.

  Further, a claw-shaped protrusion 102e is provided at the end of the lock lever 102 on the carriage 101 side. The protrusion 102e engages with the groove 101a of the carriage 101 when the carriage 101 is stationary at the home position, and locks the carriage 101 so that it cannot move.

  Next, the operation of the modified example of the carriage locking device 100 and the scanner on which the carriage locking device 100 is mounted will be described only for parts different from the fourth embodiment.

  In the scanner standby state, the carriage 101 is stationary at the home position as shown in FIG. At this time, the lock lever 102 locks the idle gear 87, the pulley shaft 86, and the pulley 85 with the rack-shaped portion 102d engaged with the idle gear 87 (FIG. 9A). Further, the lock lever 83 is locked by the protrusion 83a engaging with the protrusion 102a of the lock lever 102 (FIG. 9A).

  In this standby state, when the image reading process of the read document placed on the flat bed 14 is started, the scanner first starts energizing the solenoid 89. With this energization, the movable iron core 89a of the solenoid 89 moves in the direction away from the idle gear 87 together with the lock lever 102 (FIG. 9B). Thereby, the rack-shaped part 102d of the lock lever 102 is separated from the idle gear 87, and the lock of the idle gear 87 is released (FIG. 9B).

  Further, the scanner starts power supply of the belt 84 by the motor. The belt 84 starts running, and the pulley 85, the pulley shaft 86, and the idle gear 87 are driven to rotate counterclockwise (FIG. 9B).

  The protrusion 102 e of the lock lever 102 is disengaged from the groove 101 a of the carriage 101 as the solenoid 89 is energized. As a result, the carriage 101 is unlocked. As the belt 84 travels, the carriage 101 travels in the sub-scanning direction (arrow A) and moves away from the protrusion 102e of the lock lever 102 (FIG. 9B).

  In addition, after the projection 83a of the lock lever 83 is disengaged from the projection 102a of the lock lever 102, the energization to the solenoid 89 is stopped, and each lock lever 83 and 102 comes into contact with the projection 83a and the tip of the projection 102a. In this state, the position is fixed (FIG. 9B).

  When reading of the image of the read original is completed and the belt 84 starts traveling in the direction of the arrow A ′ together with the carriage 101, the pulley 85, the pulley shaft 86, and the idle gear 87 are driven to rotate clockwise (FIG. 9 (c). )).

  When the carriage 101 approaches the home position, as shown in FIG. 9C, the carriage 101 collides with the carriage side end portion 83d of the lock lever 83, and the lock lever 83 receives the urging force from the spring 93. On the contrary, it moves together with the carriage 101.

  As the lock lever 83 moves, the contact state between the protrusion 83a of the lock lever 83 and the protrusion 102a of the lock lever 102 is released. The lock lever 102 moves from the spring 90 toward the idle gear 87 based on the urging force, the protrusion 102e engages with the groove 101a of the carriage 101, and the rack-shaped portion 102d engages the idle gear 87. At the same time, the idle gear 87 is re-locked (FIG. 9A). Further, the protrusion 102a engages with the protrusion 83a of the lock lever 83 to re-lock the lock lever 83 (FIG. 9A). The scanner stops the power supply to the belt 84 by the motor, and the carriage 101 is relocked to the lock lever 102 at the home position (FIG. 9A).

  As described above, in the carriage locking device according to the fourth embodiment, the carriage can be directly locked by the lock lever by partially changing the shapes of the carriage and the lock lever. The occurrence of a drop can be prevented.

  In each of the above-described embodiments, the case where the image reading apparatus according to the present invention is applied to a scanner has been described as an example. However, the present invention is not limited to this. For example, the present invention can also be applied to a multifunction device including a printer, a facsimile machine, a printer unit, and a scanner unit. The carriage locking device according to the present invention can also be applied to a carriage portion mounted on an ink jet printer or a dot impact printer.

It is a block diagram of the carriage locking device according to Embodiment 1 of the present invention. It is a partial block diagram of the carriage locking device according to the first embodiment of the present invention. 1 is a schematic configuration diagram of a scanner according to the present invention. It is a block diagram of the carriage latching device concerning Example 2 of the present invention. It is a partial block diagram of the carriage locking device according to Embodiment 2 of the present invention. It is a block diagram (the 1) of the carriage latching apparatus which concerns on Example 3 of this invention. It is a block diagram (the 2) of the carriage latching apparatus which concerns on Example 3 of this invention. It is a block diagram of the carriage latching device concerning Example 4 of the present invention. It is a block diagram which shows the modification of the carriage latching apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Scanner 11 Flat bed unit 12 Scanner cover 13 ADF unit 14 Flat bed 15 Carriage 19 Reading sensor 28 Pulley 29 Pulley shaft 30 Idle gear 31 Belt 32 Lock lever 33, 34, 36, 40 Stopper 35 Spring 37 Cam 38 Camshaft 39 Cam Drive gear 41 Carriage locking device

Claims (28)

A carriage arranged to be movable in a predetermined direction;
A locking member for locking the carriage;
A power transmission unit for transmitting power from a drive source to the carriage to drive the carriage;
A release member for releasing the locking of the carriage by the locking member;
With
The power transmission unit further transmits the power to the release member,
The release member releases the lock based on the transmitted power. A carriage lock device. The carriage has a locked portion;
The locking member is engaged with the locked portion to lock the carriage,
The carriage locking device according to claim 1, wherein the release member releases the lock by disengaging the lock member from the locked portion.   3. The carriage locking device according to claim 2, wherein the locked portion is a groove formed in the carriage.   3. The locking member has a locking portion made of a claw-shaped protrusion, and locks the carriage by engaging the locking portion with the locked portion. Carriage locking device. Further comprising a support portion for rotatably supporting the locking member,
The carriage has a locked portion;
The locking member is engaged with the locked portion to lock the carriage,
The release member converts the power from the power transmission unit into a pressing force to the locking member, and applies the pressing force to the locking member.
The carriage locking device according to claim 1, wherein when the pressing force is applied, the locking member rotates based on the pressing force and is disengaged from the locked portion. A support portion for supporting the locking member so as to be movable in the direction of contact with and away from the carriage;
The carriage has a locked portion;
The locking member is engaged with the locked portion to lock the carriage,
The release member converts the power from the power transmission unit into power in a direction away from the carriage of the locking member, and applies the power to the locking member.
2. The carriage mechanism according to claim 1, wherein when the power is applied, the locking member moves in a direction away from the carriage based on the power and is disengaged from the locked portion. Stop device.   2. The carriage locking device according to claim 1, wherein the power transmission portion has a contact portion with the release member, and transmits the power to the release member via the contact portion. .   8. The carriage locking device according to claim 7, wherein the contact portion has a rack shape.   2. The carriage locking device according to claim 1, wherein the release member performs a release operation by releasing the transmission of the power from the power transmission unit to the carriage by the locking member.   The power transmission portion includes a gear portion, the locking member includes a rack-shaped portion, and the release member engages the rack-shaped portion with the gear portion to execute the release operation. The carriage locking device according to claim 9.   The carriage locking device according to claim 1, further comprising a power cut-off unit that cuts off transmission of the power when the power transmitted to the release member by the power transmission unit exceeds a predetermined threshold.   The power transmission unit transmits a rotational force to the release member, and the power cut-off unit includes a torque limiter mechanism that cuts off the transmission of the rotational force when the rotational force exceeds a predetermined threshold. The carriage locking device according to claim 11. A biasing member that biases the locking member toward the carriage;
The said latching member latches the said carriage based on the said urging | biasing from the said urging | biasing member when transmission of the said motive power by the said power transmission part is stopped. Carriage locking device.   The carriage urging device according to claim 13, wherein the urging member includes a spring that urges the engagement member based on an elastic force. A carriage that is movably disposed in a predetermined direction and on which an image reading unit for reading an image of a document is mounted;
A locking member for locking the carriage;
A power transmission unit for transmitting power from a drive source to the carriage to drive the carriage;
A release member for releasing the locking of the carriage by the locking member;
With
The power transmission unit further transmits the power to the release member,
The release member releases the locking based on the transmitted power. The image reading apparatus. The carriage has a locked portion;
The locking member is engaged with the locked portion to lock the carriage,
The image reading apparatus according to claim 15, wherein the release member releases the lock by disengaging the lock member from the locked portion.   The image reading apparatus according to claim 16, wherein the locked portion includes a groove formed in the carriage.   The locking member includes a locking portion formed of a claw-shaped protrusion, and locks the carriage by engaging the locking portion with the locked portion. Image reading apparatus. A support portion for supporting the locking member so as to be movable in the direction of contact with and away from the carriage;
The carriage has a locked portion;
The locking member is engaged with the locked portion to lock the carriage,
The release member converts the power from the power transmission unit into power in a direction away from the carriage of the locking member, and applies the power to the locking member.
16. The image reading according to claim 15, wherein when the power is applied, the locking member moves in a direction away from the carriage based on the power and is disengaged from the locked portion. apparatus. Further comprising a support portion for rotatably supporting the locking member,
The carriage has a locked portion;
The locking member is engaged with the locked portion to lock the carriage,
The release member converts the power from the power transmission unit into a pressing force to the locking member, and applies the pressing force to the locking member.
The image reading apparatus according to claim 15, wherein when the pressing force is applied, the locking member rotates based on the pressing force and is disengaged from the locked portion.   The image reading apparatus according to claim 15, wherein the power transmission unit has a contact portion with the release member, and transmits the power to the release member through the contact portion.   The image reading apparatus according to claim 21, wherein the contact portion has a rack shape.   The image reading apparatus according to claim 15, wherein the release member performs a release operation by causing the locking member to release the transmission of the power from the power transmission unit to the carriage.   The power transmission portion includes a gear portion, the locking member includes a rack-shaped portion, and the release member engages the rack-shaped portion with the gear portion to execute the release operation. 24. The image reading apparatus according to claim 23.   The image reading apparatus according to claim 15, further comprising a power cut-off unit that cuts off transmission of the power when the power transmitted to the release member by the power transmission unit exceeds a predetermined threshold.   The power transmission unit transmits a rotational force to the release member, and the power cut-off unit includes a torque limiter mechanism that cuts off the transmission of the rotational force when the rotational force exceeds a predetermined threshold. The image reading apparatus according to claim 25. A biasing member that biases the locking member toward the carriage;
The said locking member locks the said carriage based on the said urging | biasing from the said urging member when transmission of the said motive power by the said power transmission part is stopped. Image reading device.   28. The image reading apparatus according to claim 27, wherein the biasing member includes a spring that biases the locking member based on an elastic force.

Images