Patent Grant
8770572
This application claims priority from Japanese Patent Application No. 2011-257221 filed Nov. 25, 2011. The entire content of this priority application is incorporated herein by reference.
The present invention relates to a conveying apparatus for conveying a sheet and an image recording apparatus having the conveying apparatus and recording an image on the sheet.
There is known a conveying apparatus that conveys a sheet within a conveying path formed inside the conveying apparatus. An image recording apparatus, such as a printer and a multifunction peripheral, is one example of the conveying apparatus.
Some image recording apparatuses include a plurality of conveying paths in the inside of the apparatuses.
Some image recording apparatuses have a manual feed tray on their back surface. A user uses the manual feed tray to insert a sheet onto the inside of the apparatus.
There has been proposed an image recording apparatus that has a manual feed tray and a plurality of conveying paths. The image recording apparatus has a curved path extending from a sheet feed tray to a recording unit and a manual feed conveying path extending from the manual feed tray to a position where the manual feed conveying path converges into the curved path. The recording unit records an image on a sheet that has been conveyed to the recording unit.
In view of the foregoing, it is an object of the present invention to provide an improved conveying apparatus and an improved recording apparatus having the conveying apparatus, in which two conveying paths for conveying sheets converge and which can convey sheets reliably regardless of which conveying path through which the sheets are guided.
In order to attain the above and other objects, the invention provides a conveying apparatus including: a housing; a conveying roller; a first guide member; a second guide member; a third guide member; a fourth guide member; and a support member. The conveying roller is configured to convey a sheet. The first guide member is located at a downstream side of the conveying roller in a sheet conveying direction and that has a first guide part defining an inside of a curved path and configured to guide the sheet conveyed by the conveying roller. The second guide member has a second guide part defining an outside of the curved path and configured to guide the sheet conveyed by the conveying roller, the second guide part being disposed opposing the first guide part. The third guide member defines a manual feed conveying path that converges from an outside of the housing into a downstream-side portion of the curved path in the sheet conveying direction and being configured to support a sheet inserted into the inside of the housing from the outside of the housing. The fourth guide member defines the manual feed conveying path and being disposed at a position opposing the third guide member and a downstream-side edge portion of the first guide member. The support member is configured to support the second guide member such that the second guide member is pivotable between a first position and a second position, a downstream side edge of the second guide member in the sheet conveying direction being closer to the first guide member than to the fourth guide member when the second guide member is in the first position, the downstream side edge of the second guide member being closer to the fourth guide member than to the first guide member when the second guide member is in the second position.
According to another aspect, the present invention provides an image recording apparatus including: the conveying apparatus; and a recording unit that is configured to record an image on a portion of a sheet that has passed the first guide part by being conveyed by the conveying roller.
The particular features and advantages of the invention as well as other objects will become apparent from the following description taken in connection with the accompanying drawings, in which:
Next, a multifunction peripheral (MFP) 10 will be described according to an embodiment of the invention.
In the following description, up and down directions 7 are defined based on the state of the MFP 10 when the MFP 10 is set up for use; front and rear directions 8 are defined under the assumption that the side of the MFP 10 provided with an opening 13 is positioned on the near side (front side); and left and right directions 9 are defined based on the perspective of a user facing the near side (front side) of the MFP 10.
Overall Structure of the MFP 10
As shown in
The printing unit 11 has a casing 14. An opening 13 is aimed in the front surface of the casing 14. A sheet tray 20 capable of holding recording sheets 12 of various sizes, and a discharge tray 21 are disposed in the opening 13.
As shown in
Sheet Tray 20
The sheet tray 20 has a generally rectangular parallelepiped shape. The sheet tray 20 is box-shaped with an open top. However, the discharge tray 21 covers the top of the sheet tray 20 on the front side in the embodiment. The recording sheets 12 are stacked on the bottom surface of the sheet tray 20.
Feeding Unit 15
As shown in
The feeding roller 25 is driven to rotate by a drive force transmitted from a feeding motor (not shown). While contacting the topmost recording sheet 12 stacked in the sheet tray 20, the feeding roller 25 conveys the recording sheet 12 onto a conveying path 65 described below.
Conveying Path 65
As shown in
The curved path 65A is formed of an inner guide member 19 and an outer guide 18. Each of the inner guide member 19 and the outer guide 18 are disposed on the opposite side of the first conveyor 54 from the recording unit 24. The inner guide 19 is confronted but separated prescribed distances from outer guide members 18 and a first upper guide member 30 described later. The straight path 65B is provided on the opposite side of a second conveyor 55 from the recording unit 24 and is defined by a second upper guide member 32 and a second lower guide member 33 confronting each other vertically at a prescribed distance. The straight path 65B is also formed partially between the first conveyor 54 and second conveyor 55 by a platen 42 described later. The outer guide members 18, inner guide member 19, second upper guide member 32, and second lower guide member 33, as well as the first upper guide member 30 (described later) and a first lower guide member 31 (described later) all extend in the direction orthogonal to the plane of the drawing in
The conveying path 65 specifically extends from a first end 58 of the outer guide members 18 and inner guide member 19 on the sheet tray 20 side, passing through a second end 59 of the outer guide members 18 and inner guide member 19 on the first conveyor 54 side, through the nip position between the first conveyor 54, above the platen 42, and through the nip position between the second conveyor 55 to arrive at the discharge tray 21. The feeding roller 25, first conveyor 54, and second conveyor 55 convey the recording sheet 12 along the conveying path 65 in the conveying direction. The conveying direction is the direction indicated by the arrows with single dotted chain lines in
Thus, when conveyed by the feeding roller 25 of the sheet tray 20, the recording sheet 12 is guided through the first end 58 and second end 59 of the curved path 65A to the recording unit 24. In other words, the recording sheet 12 is guided along the U-shaped curved path 65A from the bottom to the top of the MFP 10 so as to be redirected from a rearward direction to a forward direction. After the recording unit 24 has recorded an image on a recording sheet 12, the sheet is guided onto the discharge tray 21.
Manual Feed Tray 23 and Manual Feed Conveying Path 66
As shown in
As indicated by a double dotted chain line in
The front extended end of the manual feed conveying path 66 converges with the second end 59 of the curved path 65A. In other words, the manual feed conveying path 66 is connected to the curved path 65A at the second end 59. The rear side (manual feed tray 23 side) of the manual feed conveying path 66 is formed by the first upper guide member 30 and the first lower guide member 31 confronting each other with a gap formed therebetween. The front side (first conveyor 54 side) of the manual feed conveying path 66 is formed by the first upper guide member 30 and the inner guide member 19 that confront each other with a gap formed therebetween.
The user inserts a recording sheet 12 through the rear opening 17 in a forward direction. During this operation, the sheet is supported on a sheet support part 64 of the manual feed tray 23 and the first lower guide member 31 and is guided along the manual feed conveying path 66 until the leading edge of the sheet arrives at the nip position in the first conveyor 54.
As described above, the first lower guide member 31 extends from the rear opening 17 formed in the rear surface 51 of the MFP 10 toward the outer guide members 18 and supports the bottom of the recording sheet 12 inserted from outside the rear surface 51 of the MFP 10. The first upper guide member 30 is arranged such that its rear side opposes the first lower guide member 31 while its front side opposes the inner guide member 19.
Conveyors 54 and 55
As shown in
The first conveying roller 60 and the pinch rollers 61 constituting the first conveyor 54 are in contact with each other and function to nip and convey a recording sheet 12. The second rollers 62 and spurs 63 constituting the second conveyor 55 are in contact with each other and function to nip and convey a recording sheet 12.
Forward and reverse drive forces transmitted from a conveying motor (not shown) drive the first conveying roller 60 and second conveying rollers 62 to rotate in forward and reverse directions. That is, the first conveying roller 60 and second conveying rollers 62 rotate in a direction for conveying the recording sheet 12 in the conveying direction when a forward drive force is transmitted from the conveying motor, and to rotate in a direction for conveying the recording sheet 12 opposite the conveying direction when a reverse drive force is transmitted from the conveying motor.
Platen 42
As shown in
Recording Unit 24
As shown in
As shown in
Conveying Mechanism
As shown in
Inner Guide Member 19
As shown in
The first guide part 19a is formed on the side of the inner guide member 19 opposing the outer guide members 18. The first guide part 19a is curved to conform to the curvature of the curved path 65A. The first guide part 19a functions to guide the recording sheet 12 conveyed along the curved path 65A. The first guide part 19a is configured of a curved surface, for example. Alternatively, the first guide part 19a may be configured of a plurality of ribs extending in the conveying direction of the recording sheet 12 and protruding from the curved surface toward the curved path 65A. As mentioned earlier, the curved path 65A need not be arc-shaped, but rather may extend straight upward from the rear end of the sheet tray 20, then curve toward the front. In this case, the first guide part 19a may be configured of a flat surface or a plurality of ribs extending upward, and a curved surface or a plurality of ribs curving and extending forward from the first flat surface or plurality of ribs. As described above, at least a portion of the first guide part 19a is curved and functions to guide recording sheets 12 conveyed by the feeding roller 25. The first guide part 19a guides surfaces of the recording sheets that have been contacted by the feeding roller 25.
Outer Guide Members 18
As shown in
Second guide parts 18a are respectively formed on the side of the outer guide members 18 opposing the inner guide member 19. The second guide parts 18a conform to the curvature of the curved path 65A. The second guide parts 18a confront the first guide part 19a. As with the first guide part 19a, the second guide parts 18a guide recording sheets 12 conveyed along the curved path 65A. The second guide parts 18a are configured of a curved surface, for example. Alternatively, the second guide parts 18a may be configured of a plurality of ribs extending along the conveying direction of the recording sheet 12 and protruding from the curved surface toward the curved path 65A. As described earlier, the curved path 65A need not be arc-shaped, but may extend directly upward from the rear end of the sheet tray 20, then curve toward the front. In this case, the each of the second guide parts 18a may be configured of a flat surface or a plurality of ribs extending upward, and a curved surface or a plurality of ribs extending from the first flat surface or plurality of ribs. As described above, at least a portion of the second guide parts 18a is curved and guides recording sheets 12 conveyed by the feeding roller 25. The second guide parts 18a guide surfaces of the sheets that are opposite to the surfaces that have been contacted by the feeding roller 25. That is, the second guide parts 18a guide the surfaces of the sheets that have not been contacted by the feeding roller 25.
In the embodiment, the outer guide members 18 become thinner toward the second end 59. That is, the dimension of the outer guide members 18 in a side view (front and rear direction 8) becomes smaller toward the second end 59 side from the dimension on first end 58 side.
As shown in
A shaft 35 is provided on the first end 58 of each of the outer guide members 18A-18C. Thus, the shafts 35 are disposed on the outer guide members 18A-18C, individually. The shafts 35 extend in the left and right directions 9 and are rotatably mounted in the support member 22 described later, enabling the outer guide members 18A-18C to pivot individually in the direction indicated by an arrow 37 in
The distal ends of the outer guide members 18 at the second end 59 are positioned above the inner guide member 19 and below the first upper guide member 30 with respect to the up and down directions 7. The outer guide members 18 having this configuration can pivot between a first position (indicated by dashed lines in
As shown in
Next, the process of mounting the rollers 84 in the outer guide members 18 will be described. As shown in
One of the rollers 84 is disposed in each of the openings 85. The rollers 84 are rotatably supported in the outer guide members 18. As shown in
As shown in
When the gaps between the outer guide members 18 and the inner guide member 19 have the relationships described in the embodiment, at least one of the outer guide members 18 must be disposed in the center and on both ends with respect to the left and right directions 9. That is, at least three outer guide members 18 must be disposed at intervals along the left and right directions 9. While the relationships among the distances DA, DB, and DC are defined by the dimensions of the outer guide members 18A, 18B, and 18C in the embodiment, the relationships among these distances may be defined by another method, provided that the same relationships can be maintained. For example, the relationships between these distances may be defined by the layout of the outer guide members 18A, 18B, and 18C. That is, if the outer guide members 18A, 18B, and 18C have the same dimension in the front and rear directions 8, the outer guide members 18A and 18C may be positioned further apart from the first guide part 19a than the center outer guide member 18B.
As shown in
Support Member 22
As shown in
First Upper Guide Member 30 and First Lower Guide Member 31
As shown in
As shown in
Pivoting of the Outer Guide Members 18
As described above, the distal ends of the outer guide members 18 are positioned above the second end 59 of the inner guide member 19. In the embodiment, the normal state of the outer guide members 18 is the first position. The outer guide members 18 naturally pivot into the first position by their own weight.
When the feeding unit 15 conveys a recording sheet 12 from the sheet tray 20 while the outer guide members 18 are in the first position, the leading edge of the recording sheet 12 contacts the outer guide members 18 and pushes the outer guide members 18 upward, causing the outer guide members 18 to pivot into the second position. As the outer guide members 18 are pivoted into the second position, the first ribs 88 formed on the outer guide members 18 are inserted between adjacent second ribs 89 formed on the first upper guide member 30. The pivoting of the outer guide members 18 from the first position to the second position is halted when the tops of the first ribs 88 contact the stopping parts 90. Once the trailing edge of the recording sheet 12 has passed the outer guide members 18 so that the outer guide members 18 are no longer pushed upward by the sheet, the outer guide members 18 pivot by their own weight back to the first position in contact with the inner guide member 19. The outer guide members 18 open the manual feed conveying path 66 when the outer guide members 18 are in the first position, and close the manual feed conveying path 66 when the outer guide members 18 are in the second position.
As described in the embodiment, by being in the second position, the outer guide members 18 can reduce the possibility that a recording sheet 12 conveyed by the feeding roller 25 between the inner guide member 19 and outer guide member 18 will be mistakenly guided between the first upper guide member 30 and first lower guide member 31. Further, by being in the first position, the outer guide members 18 can reduce the possibility that a recording sheet 12 supported by the first lower guide member 31 and inserted between the first upper guide member 30 and first lower guide member 31 will be mistakenly guided down between the inner guide member 19 and outer guide member 18. As described above, the conveying path 65 for guiding recording sheets 12 fed from the sheet tray 20 and the manual feed conveying path 66 for guiding recording sheets 12 manually fed by a user converge in the conveying mechanism 16, but the configuration of the conveying mechanism 16 in the embodiment allows the recording sheets 12 to be guided reliably, regardless of which conveying path (the conveying path 65 or manual feed conveying path 66) through which the recording sheet 12 is guided.
By contacting either the inner guide member 19 or the first upper guide member 30 with this construction, the outer guide members 18 block the path along which the recording sheet 12 could be mistakenly guided. Therefore, this construction can reduce the possibility of the recording sheet 12 being guided along the wrong path.
Further, with this configuration, only the outer guide members 18 that are contacted by the recording sheet 12 change position. That is, the size with respect to the left and right directions 9 of the recording sheet 12 conveyed between the inner guide member 19 and outer guide member 18 determines which of the outer guide members 18 change position. In other words, this configuration can reduce the number of outer guide members 18 that change position when the recording sheet 12 has a smaller dimension in the left and right directions 9. Thus, this construction can reduce the amount of resistance that the outer guide members 18 apply to the recording sheet 12 when the recording sheet 12 has a shorter dimension in the left and right directions 9.
Further, the recording sheet 12 guided between the inner guide member 19 and the outer guide members 18A-18C are less likely to contact the outer guide members 18A and 18C outside the center in the left and right directions 9. This configuration can reduce the amount of resistance that the outer guide members 18 apply to the recording sheet 12. The configuration also reduces the potential for skew in the recording sheet 12 caused by the outer guide members 18A and 18C, positioned outside the center of the recording sheet 12 with respect to the left and right directions 9, contacting the recording sheet 12.
In the embodiment described above, rollers 84 are also disposed on the outer guide members 18. Accordingly, even when the outer guide members 18 change positions, the distance at which the rollers 84 protrude from the outer guide members 18 does not change. Accordingly, the recording sheets 12 can be smoothly guided between the inner guide member 19 and outer guide members 18, regardless the position of the outer guide members 18.
In the embodiment, the outer guide members 18 pivot to the second position when a recording sheet 12 contacts and pushes the outer guide members 18, and pivot to the first position by their own weight when the sheet is no longer in contact therewith. Hence, a motor or other special mechanism need not be provided for pivoting the outer guide members 18, thereby achieving a simple structure for pivoting the outer guide members 18.
According to the embodiment, the first ribs 88 provided on the outer guide members 18 are inserted into gaps formed between each pair of adjacent second ribs 89 provided on the first upper guide member 30 when the outer guide members 18 are in the second position. Accordingly, the space for placing the outer guide members 18 in the second position can also serve as the space for constructing the first upper guide member 30, making it possible to reduce the size of the conveying mechanism 16 and, hence, the MFP 10 in general.
According to the embodiment, pivoting of the outer guide members 18 from the first position to the second position is halted when the first ribs 88 contact the stopping parts 90. In other words, pivoting of the outer guide members 18 is halted with the first ribs 88 inserted into gaps between pairs of second ribs 89. With this construction, the space in the manual feed conveying path 66 formed by the first upper guide member 30 and first lower guide member 31 can be reliably blocked. Further, since the outer guide members 18 and the first upper guide member 30 form a continuous surface in this state, the feeding roller 25 can smoothly convey recording sheets 12 through the curved path 65A.
First Variation
In the embodiment described above, the outer guide members 18 contact the inner guide member 19 in the first position and contact the first upper guide member 30 in the second embodiment, but the outer guide members 18 need not contact the inner guide member 19 and first upper guide member 30 in these positions.
For example, first stoppers (not shown) may be disposed in the curved path 65A at positions outside the conveying range of the recording sheet 12 with respect to the left and right directions 9 for halting pivoting of the outer guide members 18 at a first prescribed position approaching the inner guide member 19. Similarly, second stoppers (not shown) may also be disposed in the curved path 65A outside the conveying range of the recording sheet 12 with respect to the left and right directions 9 for halting pivoting of the outer guide members 18 at a second prescribed position approaching the first upper guide member 30.
The first variation described above can reduce the sound of impact generated when the distal ends of the outer guide members 18 contact the inner guide member 19 and first upper guide member 30. This construction can also reduce wear on the guide members 18, 19, and 30.
Second Variation
In the embodiment described above, the outer guide members 18 pivot by their own weight into the first position and pivot into the second position when pushed by a recording sheet 12. However, the outer guide members 18 may be pivoted between first and second positions by the drive force transmitted from a motor or the like.
Third Variation
In the embodiment described above, the support member 22 pivotally supports each of the outer guide members 18A-18C by disposing shafts 35 on the outer guide members 18A-18C that are inserted into holes 38 formed in the support member 22. However, the structure for pivotally supporting the outer guide members 18A-18C is not limited to that described in the embodiment. For example, holes extending in the left and right directions 9 may be formed in the left and right ends of each of the outer guide members 18A-18C. Shafts may additionally be disposed in the support member 22 at positions corresponding to the holes formed in the outer guide members 18A-18C. Hence, the outer guide members 18A-18C are pivotally supported by inserting the shafts disposed on the support member 22 into the holes formed in the outer guide members 18A-18C.
Fourth Variation
In the embodiment described above, the opening 17 through which the user manually inserts a recording sheet 12 is formed in the rear surface 51 of the MFP 10, but the opening 17 may be formed in the left or right surface of the MFP 10, for example. One example of this arrangement is a configuration in which the front and rear directions 8 in
Fifth Variation
When the user manually inserts a recording sheet 12 into the MFP 10 in the embodiment described above, the user inserts the sheet over the manual feed tray 23 and first lower guide member 31 to the conveying rollers 54. However, a feeding roller may be disposed on the rear surface 51 side of the MFP 10 for feeding the recording sheets 12 to the first conveyor 54. Much like the feeding roller 25, this feeding roller would convey recording sheets 12 supported on the manual feed tray 23 and first lower guide member 31 to the nip position in the first conveyor 54.
While the invention has been described in detail with reference to the embodiment and variations thereof, it would be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit of the invention.
For example, the distances DA and DC between the outer guide members 18A and 18C and the inner guide member 19 may be equal to the distance DB between the outer guide member 18B and the inner guide member 19 when the outer guide members 18 are in the first position.
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|---|---|---|---|
| 2011-257221 | Nov 2011 | JP | national |
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| Number | Date | Country | |
|---|---|---|---|
| 20130134016 A1 | May 2013 | US |
