Patent Application
20170283199
The present application claims priority from Japanese Patent Application No. 2016-069873, which was filed on Mar. 31, 2016, the disclosure of which is herein incorporated by reference in its entirety.
The following disclosure relates to a conveyor having a plurality of receiving trays arranged in the vertical direction and a tray unit included in the conveyor.
Conveyors having a plurality of receiving trays arranged in the vertical direction are known. For instance, there is known a sheet discharge apparatus (conveyor) having four discharge trays (receiving trays) arranged in the vertical direction. Each of the four discharge trays includes a tray body and a stopper member (protruding portion) that protrudes from an upper surface of of the tray body. The stopper member is pivotable with respect to the tray body and is configured to be selectively positioned at one of a stop position (protruding position) and a non-protruding position (retracted position) at which the stopper member does not protrude from the upper surface of the tray body. With this configuration, when a sheet on the tray body is removed therefrom, the stopper member moves from the stop position to the non-protruding position, so that the sheet is prevented from being caught on the stopper member.
In the known apparatus, however, the receiving trays are fixed to the apparatus. In this configuration, a space between adjacent two of the receiving trays decreases with a decrease in the size of the apparatus, and it becomes difficult to remove a medium from each receiving tray except an uppermost one of the receiving trays, namely, from each lower tray. In particular, it is difficult to remove, from the lower tray, a medium having a smaller dimension in a conveyance direction in which the medium is conveyed.
An aspect of the disclosure relates to a conveyor and a tray unit that enables a medium to be easily removed from each lower tray.
A conveyor according to a first aspect of the disclosure provides a conveyor, including: a plurality of receiving trays arranged in a vertical direction and each having a receiving surface by which a medium is received; a conveyance mechanism configured to convey the medium such that medium is selectively received by one of the receiving surfaces of the receiving trays; and a support supporting the receiving trays, wherein at least one receiving tray, except a lowermost one of the receiving trays that is disposed at the lowest position, is supported by the support so as to be selectively positioned at one of a receiving position at which the at least one receiving tray receives the medium conveyed by the conveyance mechanism and an upper position at which a height level of a downstream end of the medium in a conveyance direction thereof received by the receiving surface is higher than that when the at least one receiving tray is positioned at the receiving position, wherein at least one lower tray, except an uppermost one of the receiving trays that is disposed at the highest position, includes a tray body that forms the receiving surface and a protruding portion attached to the tray body so as to be selectively positioned at one of a protruding position at which the protruding portion protrudes from the receiving surface and a retracted position at which a protrusion amount of the protruding portion from the receiving surface is smaller than that when the protruding portion is positioned at the protruding position, and wherein the conveyor further comprises a force transmitting mechanism for effectuating at least one of (a) a retracting movement of the protruding portion of one of the at least one lower tray caused by an upward movement of an adjacent upper tray which is disposed just above and immediately adjacent to the one of the at least one lower tray and (b) the upward movement caused by the retracting movement, the retracting movement being a movement in which the protruding portion of the one of the at least one lower tray moves from the protruding position to the retracted position, the upward movement being a movement in which the adjacent upper tray moves from the receiving position to the upper position.
A tray unit according to the first aspect of the disclosure provides a tray unit for a conveyor, the conveyor including: a plurality of receiving trays arranged in a vertical direction and each having a receiving surface by which a medium is received; a conveyance mechanism configured to convey the medium such that medium is selectively received by one of the receiving surfaces of the receiving trays; and a support supporting the receiving trays, the tray unit comprising the plurality of receiving trays, wherein at least one receiving tray, except a lowermost one of the receiving trays that is disposed at the lowest position, is supported by the support so as to be selectively positioned at one of a receiving position at which the at least one receiving tray receives the medium conveyed by the conveyance mechanism and an upper position at which a height level of a downstream end of the medium in a conveyance direction thereof received by the receiving surface is higher than that when the at least one receiving tray is positioned at the receiving position, wherein at least one lower tray, except an uppermost one of the receiving trays that is disposed at the highest position, includes a tray body that forms the receiving surface and a protruding portion attached to the tray body so as to be selectively positioned at one of a protruding position at which the protruding portion protrudes from the receiving surface and a retracted position at which a protrusion amount of the protruding portion from the receiving surface is smaller than that when the protruding portion is positioned at the protruding position, and wherein the tray unit further comprises a force transmitting mechanism for effectuating at least one of (a) a retracting movement of the protruding portion of one of the at least one lower tray caused by an upward movement of an adjacent upper tray which is disposed just above and immediately adjacent to the one of the at least one lower tray and (b) the upward movement caused by the retracting movement, the retracting movement being a movement in which the protruding portion of the one of the at least one lower tray moves from the protruding position to the retracted position, the upward movement being a movement in which the adjacent upper tray moves from the receiving position to the upper position.
A conveyor according to a second aspect of the disclosure provides a conveyor, including: a plurality of receiving trays arranged in a vertical direction and each having a receiving surface by which a medium is received; a conveyance mechanism configured to convey the medium such that the medium is selectively received by one of the receiving surfaces of the receiving trays; and a support supporting the receiving trays, wherein at least one receiving tray, except a lowermost one of the receiving trays that is disposed at the lowest position, is supported by the support so as to be selectively positioned at one of a receiving position at which the at least one receiving tray receives the medium conveyed by the conveyance mechanism and an upper position at which a height level of a downstream end of the medium in a conveyance direction thereof received by the receiving surface is higher than that when the at least one receiving tray is positioned at the receiving position, wherein at least one lower tray, except an uppermost one of the receiving trays that is disposed at the highest position, includes a proximal portion which defines a part of the receiving surface and a distal portion which is located downstream of the proximal portion in the conveyance direction and which defines the rest of the receiving surface, wherein the distal portion includes a protruding portion protruding from the rest of the receiving surface and is pivotally attached to the proximal portion so as to be selectively positioned at one of a first position and a second position at which a protrusion amount of the protruding portion from a plane along the part of the receiving surface of the proximal portion is smaller than that when the distal portion is positioned at the first position, and wherein the conveyor further comprises a force transmitting mechanism for effectuating at least one of (e) a distal-portion movement of the distal portion of one of the at least one lower tray caused by an upward movement of an adjacent upper tray which is disposed just above and immediately adjacent to the one of the at least one lower tray and (f) the upward movement caused by the distal-portion movement, the distal-portion movement being a movement in which the distal portion of the one of the at least one lower tray moves from the first position to the second position, the upward movement being a movement in which the adjacent upper tray moves from the receiving position to the upper position.
A tray unit according to the second aspect of the disclosure provides a tray unit for a conveyor, the conveyor including: a plurality of receiving trays arranged in a vertical direction and each having a receiving surface by which a medium is received; a conveyance mechanism configured to convey the medium such that the medium is selectively received by one of the receiving surfaces of the receiving trays; and a support supporting the receiving trays, the tray unit comprising the plurality of receiving trays, wherein at least one receiving tray, except a lowermost one of the receiving trays that is disposed at the lowest position, is supported by the support so as to be selectively positioned at one of a receiving position at which the at least one receiving tray receives the medium conveyed by the conveyance mechanism and an upper position at which a height level of a downstream end of the medium in a conveyance direction thereof received by the receiving surface is higher than that when the at least one receiving tray is positioned at the receiving position, wherein at least one lower tray, except an uppermost one of the receiving trays that is disposed at the highest position, includes a proximal portion which defines a part of the receiving surface and a distal portion which is located downstream of the proximal portion in the conveyance direction and which defines the rest of the receiving surface, wherein the distal portion includes a protruding portion protruding from the rest of the receiving surface and is pivotally attached to the proximal portion so as to be selectively positioned at one of a first position and a second position at which a protrusion amount of the protruding portion from a plane along the part of the receiving surface of the proximal portion is smaller than that when the distal portion is positioned at the first position, and wherein the tray unit further comprises a force transmitting mechanism for effectuating at least one of (e) a distal-portion movement of the distal portion of one of the at least one lower tray caused by an upward movement of an adjacent upper tray which is disposed just above and immediately adjacent to the one of the at least one lower tray and (f) the upward movement caused by the distal-portion movement, the distal-portion movement being a movement in which the distal portion of the one of the at least one lower tray moves from the first position to the second position, the upward movement being a movement in which the adjacent upper tray moves from the receiving position to the upper position.
In the above-indicated first and second aspects of the disclosure, the lowermost one of the receiving trays may also be supported by the support so as to be selectively positioned at one of the receiving position and the upper position.
In the above-indicated first aspect of the disclosure, the uppermost one of the receiving trays may also include the protruding portion attached to the tray body so as to be selectively positioned at one of the protruding position and the retracted position.
In the above-indicated second aspect of the disclosure, the uppermost one of the receiving trays may also include the proximal portion which defines a part of the receiving surface and the distal portion which defines the rest of the receiving surface.
The objects, features, advantages, and technical and industrial significance of the present disclosure will be better understood by reading the following detailed description of embodiments, when considered in connection with the accompanying drawings, in which:
There will be described an ink-jet printer (hereinafter simply referred to as “printer”) 1 according to a first embodiment. As shown in
A receiving tray 12 is provided at the upper portion of the housing 1x.
The receiving tray 12 includes: a tray body 13 defined by an upper wall of the housing 1x; a base 14 removably attached to the tray body 13; and a stopper 15 attached to the base 14 so as to be pivotable about an axis extending in a main scanning direction. The tray body 13 has a receiving surface 13a for receiving a sheet P.
The tray unit 50 includes: four receiving trays 52a-52d arranged in the vertical direction; and the support 51 shaped like a housing and supporting the receiving trays 52a-52d such that each of the receiving trays 52a-52d is pivotable about an axis 53x1 extending in the main scanning direction. The receiving tray 52a is an uppermost tray disposed at the highest position among the four receiving trays 52a-52d. The receiving trays 52b-52d are lower trays. The receiving tray 52d is a lowermost tray disposed at the lowest position among the four receiving trays 52b-52d.
Each of the receiving trays 52a-52d includes: a tray body 53 shaped like a plate and having a groove 53y formed in its upper surface; a base 54 detachably attached to the tray body 53 in the groove 53y so as to be movable in mutually opposite directions parallel to a conveyance direction D in which the sheet P is discharged onto the receiving tray; and a stopper 55 attached to the base 54 so as to be pivotable about an axis 55x1 (
Projective areas X, which are formed by projecting the receiving surfaces 13a, 53a of the receiving trays 12, 52a-52d in the vertical direction onto an imaginary plane orthogonal to the vertical direction, overlap each other. In other words, at least a part of a projective area formed by projecting, in the vertical direction, the receiving surface of each of the at least one lower tray on an imaginary plane orthogonal to the vertical direction overlaps a projective area formed by projecting, in the vertical direction, the receiving surface of any one of the receiving trays disposed above said each of the at least one lower tray.
In the tray body 53, a multiplicity of recesses 53z are formed in side surfaces which partially define the groove 53y and which extend in the conveyance direction D. The recesses 53z are arranged in the conveyance direction D. A pair of protrusions (not shown) are provided on outer side surfaces of the base 54 which are perpendicular to the main scanning direction. The protrusions of the base 54 are configured to be fitted in any one of pairs of recess 53z of the tray body 53 which are opposed to each other in the main scanning direction. When the pair of protrusions are fitted in the pair of recesses 53z, the base 54 is positioned with respect to the tray body 53.
The support 51 covers an upstream end portion of each of the receiving trays 52a-52d in the conveyance direction D to prevent or hinder removal of the sheet P from the receiving surface 53a in the main scanning direction. That is, the support 51 is one example of a hindering member.
The housing 1x houses an ink-jet head (hereinafter simply referred to as “head”) 10, a platen 11, a sheet supply mechanism 20, a conveyance mechanism 30a, and a controller 1c. A conveyance mechanism 30b is provided in the support 51.
The head 10 has a generally rectangular parallelepiped shape that is long in the main scanning direction. That is, the printer 1 is an ink-jet printer of a line type. The head 10 includes: a flow-passage unit in which are formed ink passages including pressure chambers; and actuators each configured to give a pressure to ink in a corresponding one of the pressure chambers in the flow-passage unit. A lower surface of the head 10, i.e., a lower surface of the flow-passage unit, serves an ejection surface 10x in which are formed a plurality of ejection openings for ejecting ink. The ink is supplied from a cartridge (not shown) to the ink passages of the flow-passage unit.
The platen 11 is disposed below the head 10. The platen 11 is a flat plate and has a support surface 11x for supporting the sheet P. The support surface 11x of the platen 11 is opposed to the ejection surface 10x of the head 10 in the vertical direction with a space interposed therebetween.
The sheet sheet supply mechanism 20 includes a sheet tray 21 removably installed on the housing 1x and capable of storing a plurality of sheets P; and a sheet supply roller 22 attached to the sheet tray 21. Under control of the controller 1c, the sheet supply roller 22 rotates by being driven by a sheet supply motor 20M (
A conveyance mechanism 30 is constituted by a conveyance mechanism 30a and the conveyance mechanism 30b. The conveyance mechanism 30 is configured to convey the sheet P such that the sheet P supplied from the sheet sheet supply mechanism 20 passes the space between the ejection surface 10x and the support surface 11x and is consequently received by a selected one of the receiving trays 12, 52a-52d and receiving trays of another tray unit disposed on the upper portion of the tray unit 50. The conveyance mechanism 30 forms paths R1-R6.
The path R1 is a path through which the sheet P is conveyed toward the receiving tray 12. The path R2 is a path through which the sheet P is conveyed toward the receiving tray 52d. The path R3 is a path through which the sheet P is conveyed toward the receiving tray 52c. The path R4 is a path through which the sheet P is conveyed toward the receiving tray 52b. The path R5 is a path through which the sheet P is conveyed toward the receiving tray 52a. The path R6 is a path through which the sheet P is conveyed toward a receiving tray of another tray unit through an opening 51x2 formed in an upper surface of the support 51.
At one end of a common path R12 common to the paths R1, R2, i.e., at a branch position A1, the paths R1, R2 branch off from the common path R12. At one end of a common path R23 common to the paths R2, R3, i.e., at a branch position A2, the paths R2, R3 branch off from the common path R23. At one end of a common path R34 common to the paths R3, R4, i.e., at a branch position A3, the paths R3, R4 branch off from the common path R34. At one end of a common path R45 common to the paths R4, R5, i.e., at a branch position A4, the paths R4, R5 branch off from the common path R45. At one end of a common path R56 common to the paths R5, R6, i.e., at a branch position A5, the paths R5, R6 branch off from the common path R56.
The conveyance mechanism 30a includes a guide 31 and roller pairs 32-36. The conveyance mechanism 30b includes the guide 31 and roller pairs 37-44.
The guide 31 is disposed so as to be opposed to front and back surfaces of the sheet P conveyed along the paths R1-R6.
The roller pairs 32-36 are disposed along the path R1. The roller pairs 37, 38 are disposed along the path R2 that branches off from the common path R12. The roller pairs 39, 40 are disposed along the path R3 that branches off from the common path R23. The roller pairs 41, 42 are disposed along the path R4 that branches off from the common path R34. The roller pairs 43, 44 are disposed along the path R5 that branches off from the common path R45.
Under the control of the controller 1c, the roller pairs 32-36 rotate by being driven by a conveyance motor 30aM (
Switchers F1-F5 are provided at the respective branch positions A1-A5 to switch a destination of the sheet P at the respective branch positions A1-A5. The switchers F1-F5 respectively have movable members F1a-F5a which are pivotable about respective shafts F1x-F5x each extending in the main scanning direction.
Under the control of the controller 1c, the movable member F1a is driven by a switching motor F1M (
As shown in
The controller 1c is electrically connected to a connector C1 provided on the upper surface of the housing 1x. When the tray unit 50 is installed on the housing 1x, the connector C1 is brought into contact with and electrically connected to a connector C2 provided on the lower surface of the support 51. The connector C2 is electrically connected to the conveyance motor 30bM and the switching motors F2M-F5M of the tray unit 50. Thus, signal transmission and reception are performable between: the controller 1c; and the conveyance motor 30bM and the switching motors F2M-F5M of the tray unit 50.
When another tray unit is installed on the upper portion of the tray unit 50, a connector C3 provided on the upper surface of the support 51 of the tray unit 50 is brought into contact with and electrically connected to another connector provided on a lower surface of a support of another tray unit. The connector of another tray is electrically connected to a conveyance motor and switching motors of another tray unit. Thus, signal transmission and reception are performable between: the controller 1c; and the conveyance motor and the switching motors of another tray unit.
Under the control of the controller 1c, the actuators of the head 10 are driven and the ink is selectively ejected from the ejection openings formed in the ejection surface 10x when the sheet P conveyed by the conveyance mechanism 30 passes through the space between the ejection surface 10x and the support surface 11x. The ejected ink is attached to the sheet P, so that an image is formed on the sheet P, namely, image recording is performed on the sheet P. The sheet P which has been subjected to the image recording is further conveyed by the conveyance mechanism 30 and is finally received by a selected one of the receiving trays 12, 52a-52d.
When the sheet P is received by one of the receiving trays 12, 52a-52d, the sheet P is conveyed in the conveyance direction D, and its leading end comes into contact with the stopper 15, 55, so that the sheet P drops onto a corresponding one of the receiving surfaces 13a, 53a of the receiving trays 12, 52a-52d.
Referring next to
Each of the receiving trays 52a-52d is configured to pivot with respect to the support 51 so as to be selectively positioned at one of: a receiving position (i.e., a position of each of the receiving trays 52a, 52b indicated by the solid line in
The stopper 55 includes a cylindrical shaft 55x having an axis 55x1 extending in the main scanning direction and a stopper body 55y fixed to the shaft 55x and shaped like a flat plate. The stopper body 55y extends from the shaft 55x in a direction orthogonal to the main scanning direction.
The base 54 includes a bearing (not shown) for supporting the shaft 55x. The bearing has an arcuate surface for supporting the circumferential surface of the shaft 55x.
The stopper 55 is configured to pivot with respect to the base 54 so as to be selectively positions at one of: a protruding position (indicated by the solid line in
The printer 1 includes a force transmitting mechanism 60 for effectuating: a retracting movement of the stopper 55 of one of lower trays (i.e., the receiving trays 52b-52d) from the protruding position to the retracted position caused by an upward movement of an adjacent upper tray, which is disposed just above and immediately adjacent to the one of the lower trays, from the receiving position to the upper position; and the upward movement caused by the retracting movement. The force transmitting mechanism 60 is for further effectuating: a first return movement of the stopper 55 of the one of the lower trays from the retracted position to the protruding position caused by a second return movement of the adjacent upper tray from the upper position to the receiving position; and the second return movement caused by the first return movement.
When focusing on one lower tray (i.e., one of the receiving trays 52b-52d), the force transmitting mechanism 60 includes: gears 61-64 connected to a shaft 53x of one adjacent upper tray which is disposed just above and immediately adjacent to the one lower tray; a pinion gear 65 connected to the gear 64 via a shaft 64x; and a rack 66 meshing with the pinion gear 65 and provided on the one lower tray. The gear 64 is provided with a torque limiter 64t.
The gear 61 is fixed to the shaft 53x of the adjacent upper tray and rotates together with the shaft 53x. The gear 62 is in mesh with the gear 61, the gear 63 is in mesh with the gear 62, and the gear 64 is in mesh with the gear 63. The gear 64 connected to the shaft 53x of the adjacent upper tray and the gear 61 connected to the shaft 53x of the one lower tray are spaced apart from each other. The shaft 64x is fixed at one end thereof to a rotation center of the gear 64 and at another end thereof to a rotation center of the pinion gear 65.
In the tray body 53 of the lower tray, a groove-like track extending in the conveyance direction D is formed at a central portion, in the main scanning direction, of the bottom surface of the groove 53y.
The rack 66 extends within the track in the conveyance direction D. The rack 66 is held in contact with the stopper 55 irrespective of the position of the stopper 55 with respect to the tray body 53. The shaft 55x of the stopper 55A has a protruding portion 55xp formed at its central portion in the main scanning direction. The protruding portion 55xp is held in engagement with a recessed portion 66p of the rack 66. The position of the stopper 55 is determined by engagement of the protruding portion 55xp and the recessed portion 66p.
Referring next to
There will be first explained the operation of the force transmitting mechanism 60 for effectuating the upward movement of the receiving tray 52a from the receiving position to the upper position caused by the retracting movement of the stopper 55 of the receiving tray 52b from the protruding position to the retracted position.
When the stopper 55 of the receiving tray 52b is manually moved by a user from the protruding position to the retracted position and pivots counterclockwise in
Next, there will be explained the operation of the force transmitting mechanism 60 for effectuating the retracting movement of the stopper 55 of the receiving tray 52b from the protruding position to the retracted position caused by the upward movement of the receiving tray 52a from the receiving position to the upper position.
When the receiving tray 52a is manually moved by the user from the receiving position to the upper position, the gear 61 rotates clockwise in
In the process of a movement of the adjacent upper tray from the receiving position (i.e., a position of the receiving tray 52a indicated by the solid line in
Next, there will be explained the operation of the force transmitting mechanism 60 for effectuating: a movement (second return movement) of the receiving tray 52a from the upper position to the receiving position caused by a movement (first return movement) of the stopper 55 of the receiving tray 52b from the retracted position to the protruding position.
When the stopper 55 of the receiving tray 52b is manually moved by the user from the retracted position to the protruding position and pivots clockwise in
Next, there will be explained the operation of the force transmitting mechanism 60 for effectuating the movement (the first return movement) of the stopper 55 of the receiving tray 52b from the retracted position to the protruding position caused by the movement (the second return movement) of the receiving tray 52a from the upper position to the receiving position.
When the receiving tray 52a is manually moved by the user from the upper position to the receiving position, the gear 61 rotates counterclockwise in
According to the present embodiment, when the sheet P is taken out of or removed from the lower tray (i.e., one of the receiving trays 52b-52d), the adjacent upper tray, which is disposed just above and immediately adjacent to the lower tray, moves from the receiving position to the upper position (the upward movement), whereby a work space is enlarged. Further, owing to the force transmitting mechanism 60, it is not necessary to separately or individually perform the movement (the retracting movement) for moving the stopper 55 of the lower tray from the protruding position to the retracted position and the movement (the upward movement) for moving the adjacent upper tray from the receiving position to the upper position. Consequently, the present embodiment facilitates removal of the sheet P from the lower tray. In this sense, the stopper 55 of the lower tray and the adjacent upper tray work in an interlocked fashion.
In the present embodiment, the force transmitting mechanism 60 is configured to further effectuate: the movement (the first return movement) of the stopper 55 of the lower tray from the retracted position to the protruding position caused by the movement (the second return movement) of the adjacent upper tray from the upper position to the receiving position; and the second movement caused by the first return movement. This arrangement eliminates a necessity of separately or individually performing the movement (the first return movement) for moving the stopper 55 of the lower tray from the retracted position to the protruding position and the movement (the second return movement) for moving the adjacent upper tray from the upper position to the receiving position, after the sheet P has been taken out of the lower tray. It is consequently possible to easily return the stopper 55 of the lower tray and the adjacent upper tray to the respective original positions after the sheet P has been taken out of the lower tray.
In the present embodiment, when the stopper 55 is positioned at the protruding position, the stopper 55 faces one end of the sheet P in the conveyance direction D received by the receiving surface 53a. This arrangement enables the sheets P conveyed at a high speed to be neatly stacked on the corresponding one of the receiving trays 52a-52d.
In the present embodiment, there is provided, for the lower trays, a hindering member (the support 51) configured to hinder removal of the sheet P from the receiving surface 53a in the main scanning direction. The hindering member makes it difficult to remove, in the main scanning direction, the sheet P received by each lower tray. Therefore, the sheet P is removed from each lower tray in the conveyance direction D. In this instance, the stopper 55 may become an obstacle to the removal of the sheet P in the conveyance direction D. In the present embodiment, however, the force transmitting mechanism 60 effectuates that the retracting movement of the stopper 55 of the lower tray from protruding position to the retracted position and the upward movement of the adjacent upper tray from the receiving position to the upper position are performed in conjunction with each other, thereby facilitating the removal of the sheet P in the conveyance direction D. It is noted that the support 51 functioning as the hindering member may be configured not to hinder the removal of the sheet P from the uppermost receiving tray 52 in the conveyance direction D.
In the present embodiment, the position of the stopper 55 in the conveyance direction D with respect to the tray body 53 is changeable. In this arrangement, the position of the stopper 55 with respect to the tray body 53 is changed in accordance with a dimension of the sheet P in the conveyance direction D, whereby the sheets P having various dimensions in the conveyance direction D can be neatly stacked on the corresponding one of the receiving trays 52a-52d.
In the present embodiment, the force transmitting mechanism 60 includes the rack 66 (as one example of an extending member) extending in the conveyance direction D so as to be held in contact with the stopper 55 irrespective of the position of the stopper 55 with respect to the tray body 53. In the arrangement in which the position of the stopper 55 in the conveyance direction D with respect to the tray body 53 is changeable, if constituent components such as the gears of the force transmitting mechanism 60 are disposed for each of positions at which the stopper 55 can be located with respect to the tray body 53, the number of the constituent components inevitably increases. In contrast, the present arrangement can reduce the number of constituent components of the force transmitting mechanism 60.
In the present embodiment, each of the receiving trays 52a-52d is supported by the support 51 so as to be pivotable about the axis 53x1 (as one example of a first axis) extending in the main scanning direction. This arrangement enables the movement of each of the receiving trays 52a-52d between the receiving position and the upper position by a simple mechanism, as compared with an arrangement in which the receiving trays 52a-52d slide in the vertical direction. It is noted that the lowermost tray 52d may be supported by the support 51 so as not to be pivotable about the axis 53x1. In other words, at least the receiving trays 52a-52c other than the lowermost tray 52d are supported by the support 51 so as to be pivotable about the axis 53x1.
In the present embodiment, the stopper 55 is supported by the tray body 53 so as to be pivotable about the axis 55x1 (as one example of a second axis) extending in the main scanning direction. This arrangement enables the movement of the stopper 55 between the protruding position and the retracted position by a simple mechanism, as compared with an arrangement in which the stopper 55 slides in the vertical direction.
In the present embodiment, the force transmitting mechanism 60 includes a torque limiter 64t as one example of a transmission prohibiting member. The torque limiter 64t is configured: such that, when the adjacent upper tray moves from the receiving position to the first upper position, the torque limiter 64t does not prohibit power transmission among the gears 61-65 so as to enable the stopper 55 of the lower tray to move from the protruding position to the retracted position; and such that, when the adjacent upper tray moves from the first upper position to the second upper position, the torque limiter 64t prohibits power transmission among the gears 61-65 so as to enable the stopper 55 to be kept at the retracted position without being moved. In this arrangement, when the adjacent upper tray moves from the receiving position to the first upper position, namely, before the adjacent upper tray moves to the second upper position, the stopper 55 of the lower tray moves from the protruding position to the retracted position, so that the stopper 55 can be quickly moved to the retracted position. Further, when the adjacent upper tray moves from the first upper position to the second upper position, the stopper 55 is prevented from further moving from the retracted position. It is thus possible to prevent the force transmitting mechanism 60 from failing to operate due to otherwise caused further movement of the stopper 55. It is noted that the lowermost tray 52d may be configured not to be selectively positioned at one of the first upper position and the second upper position. In other words, at least the receiving trays 52a-52c other than the lowermost tray 52d are configured to be electively positioned at one of the first upper position and the second upper position.
Referring next to
A tray unit 250 of the second embodiment includes two receiving trays 52a, 52b.
A force transmitting mechanism 260 of the second embodiment includes: a cam 261 supported by the support 51 through a spring 261s; an L-Shaped plate 262 fixed to the shafts 53x of the respective receiving trays 52a, 52b; a first link 263 whose one end is held in contact with the cam 261; a second link 264 connected to the other end of the first link 263; a pinion gear 265 meshing with one side surface of the second link 264 that is opposite to the other side surface to which the first link 263 is connected; and a rack 266 meshing with the pinion gear 265 and disposed such that the pinion gear 265 is interposed between the rack 266 and the second link 264 in the main scanning direction. The first link 263, the second link 264, the pinion gear 265, and the rack 266 are provided for the receiving tray 52b.
The spring 261s is connected, at one end thereof, to an upper end of the cam 261 and is connected, at the other end thereof, to an upper wall of the support 51. The spring 261s urges the cam 261 upward. The other end of the first link 263 is supported by the other sided surface of the second link 264 so as to be pivotable about an axis extending in the main scanning direction. The second link 264 is provided in the tray body 53 of the receiving tray 52b and is movable in the conveyance direction D with respect to the tray body 53 of the receiving tray 52b.
Like the rack 66 in the first embodiment, the rack 266 extends in the conveyance direction D within a groove-like track formed in the tray body 53. The rack 266 is held in contact with the stopper 55 irrespective of the position of the stopper 55 with respect to the tray body 53. As in the first embodiment, the shaft 55x of the stopper 55 has the protruding portion 55xp formed at its central portion in the main scanning direction. The protruding portion 55xp is held in engagement with a recessed portion 266p of the rack 266. The position of the stopper 55 is determined by engagement of the protruding portion 55xp and the recessed portion 266p.
When each of the receiving trays 52a, 52b is positioned at the receiving position, the L-shaped plates 262 of the respective receiving trays 52a, 52b are in contact with respective protruding pins 261p of the cam 261, as shown in
There will be explained operations of the force transmitting mechanism 260.
The force transmitting mechanism 260 effectuates: the retracting movement caused by the upward movement; and the first return movement caused by the second return movement. The transmitting mechanism 260 does not effectuate the upward movement caused by the retracting movement; and the second return movement caused by the first return movement.
There will be first explained the operation of the force transmitting mechanism 260 for effectuating the movement (the retracting movement) of the stopper 55 of the receiving tray 52b from the protruding position to the retracted position caused by the movement (the upward movement) of the receiving tray 52a from the receiving position to the upper position.
When the receiving tray 52a is manually moved by the user form the receiving position to the upper position, the L-shaped plate 262 of the receiving tray 52a pushes down the pin 261p, and the cam 261 moves downward against the urging force of the spring 261s, as shown in
There will be next explained the operation of the force transmitting mechanism 260 for effectuating the movement (the first return movement) of the stopper 55 of the receiving tray 52b from the retracted position to the protruding position caused by the movement (the second return movement) of the receiving tray 52a from the upper position to the receiving position.
When the receiving tray 52a is manually moved by the user from the upper position to the receiving position, the pin 261p is released from the pushing by the L-shaped plate 262 of the receiving tray 52a, and the cam 261 moves upward by the urging force of the spring 261s, as shown in
As described above with respect to the first embodiment, when the sheet P is taken out of or removed from the lower tray (the receiving tray 52b), the adjacent upper tray (the receiving tray 52a), which is disposed just above and immediately adjacent to the lower tray, moves from the receiving position to the upper position (the upward movement), whereby a work space is enlarged. Further, owing to the force transmitting mechanism 260, it is not necessary to separately or individually perform the movement (the retracting movement) for moving the stopper 55 of the lower tray from the protruding position to the retracted position and the movement (the upward movement) for moving the adjacent upper tray from the receiving position to the upper position. Consequently, the present embodiment facilitates removal of the sheet P from the lower tray. In this sense, the stopper 55 of the lower tray and the adjacent upper tray work in an interlocked fashion.
In addition, the second embodiment offers advantages similar to those in the first embodiment owing to the configuration similar to that in the first embodiment.
Referring next to
A tray unit 350 of the third embodiment includes two receiving trays 52a, 352b.
The receiving tray 352b functioning as the lower tray includes: a tray body 353 shaped like a plate and having the groove 53y formed in its upper surface; the base 54; and the stopper 55. The tray body 353 has a receiving surface 353a for receiving the sheet P.
The tray body 353 includes a proximal portion 353X which defines a part 353a1 of the receiving surface 353a and a distal portion 353Y which is located downstream of the proximal portion 353X in the conveyance direction D and which defines the rest 353a2 of the receiving surface 353a. The base 54 and the stopper 55 are provided for the distal portion 353Y. The stopper 55 protrudes from the rest 353a2 of the receiving surface 353a.
The distal portion 353Y is pivotally attached to the proximal portion 353X about an axis extending in the main scanning direction, so as to be selectively positioned at one of a first position indicated by the solid line in
The sheet P received by the receiving tray 352b is supported by both of the proximal portion 353X and the distal portion 353Y or by only the proximal portion 353X, depending upon the dimension of the sheet P in the conveyance direction D. In an instance where the sheet P is supported by both of the proximal portion 353X and the distal portion 353Y when the distal portion 353Y is positioned at the first position, a downstream portion of the sheet P in the conveyance direction D may be kept supported by the receiving surface 353a2 or may be apart from the receiving surface 353a2 when the distal portion 353Y moves from the first position to the second position.
A force transmitting mechanism 360 of the third embodiment is identical to the force transmitting mechanism 60 of the first embodiment except the structure of a rack.
Like the rack 66 of the first embodiment, a rack 366 of the third embodiment is in mesh with the pinion gear 65 and is provided for the lower tray. In contrast to the rack 66 of the first embodiment that extends substantially throughout the conveyance direction D of the tray body 53, the rack 366 of the third embodiment is provided only for the proximal portion 353X. In the proximal portion 353X, a groove-like track extending in the conveyance direction D is formed at a central portion, in the main scanning direction, of a bottom surface of the groove 53y. The rack 366 extends within the track in the conveyance direction D. An upstream end of the rack 366 in the conveyance direction D is held in mesh with the pinion gear 65, and a downstream end of the rack 366 in the conveyance direction D is held in contact with an upstream end surface of the distal portion 353Y in the conveyance direction D, as shown in
The upstream end surface of the distal portion 353Y in the conveyance direction D is inclined such that a lower portion of the upstream end surface is located on a more upstream side in the conveyance direction D than an upper portion thereof. In other words, the upstream end surface of the distal portion 353Y in the conveyance direction D is inclined such that the dimension of the distal portion 353Y in the vertical direction gradually decreases toward the upstream side in the conveyance direction D. When the distal portion 353Y is positioned at the first position, the downstream end of the rack 366 in the conveyance direction D is held in contact with a substantially vertically central portion of the upstream end surface of the distal portion 353Y in the conveyance direction D, as shown in
There will be explained operations of the force transmitting mechanism 360.
The force transmitting mechanism 360 effectuates: a movement of the receiving tray 52a from the receiving position to the upper position, i.e., an upward movement, caused by a movement of the distal portion 353Y of the receiving tray 352b from the first position to the second position, i.e., a distal-portion movement; and the distal-portion movement caused by the upward movement.
There will be first explained the operation of the force transmitting mechanism 360 for effectuating the movement (the upward movement) of the receiving tray 52a from the receiving position to the upper position caused by the movement (the distal-portion movement) of the distal portion 353Y of the receiving tray 352b from the first position to the second position.
When the distal portion 353Y of the receiving tray 352b is manually moved by the user from the first position to the second position, the upstream end surface of the distal portion 353Y in the conveyance direction D pushes the rack 366, and the rack 366 moves upstream in the conveyance direction D, as shown in
There will be next explained the operation of the force transmitting mechanism 360 for effectuating the movement (the distal-portion movement) of the distal portion 353Y of the receiving tray 352b from the first position to the second position caused by the movement (the upward movement) of the receiving tray 52a form the receiving position to the upper position.
When the receiving tray 52a is manually moved by the user from the receiving position to the upper position, the gear 61 rotates clockwise in
According to the third embodiment described above, when the sheet P is taken out of or removed from the lower tray (the receiving tray 352b), the adjacent upper tray (the receiving tray 52a), which is disposed just above and immediately adjacent to the lower tray, moves from the receiving position to the upper position (the upward movement), so that a work space is enlarged. Further, owing to the force transmitting mechanism 360, it is not necessary to separately or individually perform the movement (the distal-portion movement) for moving the distal portion 353Y of the lower tray from the first position to the second position and the movement (the upward movement) for moving the adjacent upper tray from the receiving position to the upper position. Consequently, the present embodiment facilitates removal of the sheet P from the lower tray. In this sense, the stopper 55 of the lower tray and the adjacent upper tray work in an interlocked fashion.
In addition, the third embodiment offers advantages similar to those in the first embodiment owing to the configuration similar to that in the first embodiment.
While the embodiments of the present disclosure have been explained, it is to be understood that the disclosure is not limited to the details of the illustrated embodiments, but may be embodied with other changes and modifications without departing from the scope of the disclosure defined in the attached claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2016-069873 | Mar 2016 | JP | national |
