JP3952810B2 - Conveying apparatus and recording apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a conveying apparatus, and further relates to a recording apparatus that records an image on a sheet conveyed by the conveying apparatus.
[0002]
[Prior art]
As a recording apparatus, there is a dot impact printer including a printer main body 100 illustrated in FIG. 7 in which a recording head records an image such as a character on a sheet conveyed by a conveying apparatus.
[0003]
In the printer main body 100, the conveying device 101 includes a platen (not shown), a plurality of driven rollers (not shown) arranged along the longitudinal direction of the platen, and a lower sheet guide 102 for placing and guiding a sheet. And an upper seat guide 103 that guides the seat to the lower seat guide 102 side, and a push tractor unit 104.
[0004]
The driven roller is configured to be able to contact and separate from the platen. When the sheet is a cut sheet, the cut sheet is nipped and conveyed between the platen and the driven roller. The push tractor unit 104 conveys the continuous paper when the sheet is continuous paper. At this time, the driven roller moves away from the platen and does not actively contribute to the conveyance of the continuous paper.
[0005]
[Problems to be solved by the invention]
As shown in FIG. 8, the upper sheet guide 103 includes a guide portion 105 that contacts and guides the sheet, and the guide portion 105 is formed uniformly along the longitudinal direction of the upper sheet guide 103. For this reason, since the sheet conveyed between the upper sheet guide 103 and the lower sheet guide 102 comes into contact with the entire guide portion 105 in the upper sheet guide 103, the conveyance load becomes large and good conveyance is achieved. May be damaged.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a transport apparatus and a recording apparatus that can reduce the transport load and can transport a transported body (sheet) satisfactorily. Another object of the present invention is to provide a conveying apparatus and a recording apparatus that can improve the detection accuracy of a detector that detects a conveyed object (sheet).
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, the first transport roller, the lower transported body guide for placing and guiding the transported body, and the lower transported body guide are disposed so as to face each other. In the transport device for transporting the transported body by the upper transported body guide formed with a plurality of guide pieces for guiding to the lower transported body guide side, the detector for detecting the transported body is the lower transported object A second transport roller is provided in the body guide, and can be transported by sandwiching the transported body with the first transport roller, and the second transport roller is formed in the lower transported body guide. A guide piece for guiding the upper transported object corresponding to the second transport roller, formed at an upstream position of the second transport roller, and out of the plurality of guide pieces. One guide piece is formed at a position corresponding to the detector side by side, and The is characterized in that the guiding to the detector side.
[0009]
According to a second aspect of the present invention, a recording head mounted on a travelable carriage records an image on a sheet conveyed by a conveying device, and the conveying device mounts a first conveying roller and a sheet. Recording to convey the sheet by the lower sheet guide for guiding the sheet and the upper sheet guide disposed opposite to the lower sheet guide and formed with a plurality of guide pieces for guiding the sheet to the lower sheet guide side. In the apparatus, a detector for detecting a sheet is provided in the lower sheet guide, and a second conveying roller is provided which can convey the sheet while sandwiching the sheet with the first conveying roller. Is accommodated in an opening formed in the lower sheet guide, the guide piece of the upper sheet guide corresponds to the second transport roller, and is formed at an upstream position of the second transport roller, Above One of the guide pieces is formed at a position corresponding to the side of the detector.
[0011]
The invention according to claim 3 is the invention according to claim 2, wherein the first transport roller is a platen, and the second transport roller is a driven roller.
[0012]
The invention according to claim 6 is the invention according to claim 4 or 5, further comprising a second transport roller that can transport the sheet while sandwiching the sheet with the first transport roller. When the roller is accommodated in the opening formed in the lower sheet guide, the upper sheet guide guide piece is formed at a position corresponding to the second transport roller. Is.
[0013]
The invention according to claim 7 is the invention according to any one of claims 4 to 6, wherein the first transport roller is a platen, and the second transport roller is a driven roller. is there.
[0015]
Since the upper transport guide (upper sheet guide) is formed with a guide piece extending toward the lower transport guide (lower sheet guide), the entire upper transport guide is entirely transported. Compared with the case where the transported body is guided in contact with the (sheet), the transport resistance of the transported body (particularly continuous paper) can be reduced, so that the transported body can be transported satisfactorily.
[0017]
A guide piece of the upper conveyed body guide (upper sheet guide) is formed at a position corresponding to a detector that is installed in the lower conveyed object guide (lower sheet guide) and detects the conveyed object (sheet). Therefore, since the guide piece guides the transported body toward the detector, the detection accuracy of the transported body by the detector can be improved.
[0019]
A second conveyance roller is provided to be able to convey the object to be conveyed (sheet) with the first conveyance roller, and this second conveyance roller serves as a lower conveyance object guide (lower sheet guide). In the case of being accommodated and disposed in the formed opening, the guide piece of the upper transport guide (upper sheet guide) is formed at a position corresponding to the second transport roller. Since the conveyed object can be guided to the nip point between the first conveying roller and the second conveying roller, the conveyed object can be conveyed satisfactorily.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
FIG. 1 is a perspective view showing a printer main body of a dot impact printer to which an embodiment of a recording apparatus according to the present invention is applied. FIG. 2 is a side sectional view of the printer main body of FIG.
[0022]
The printer 10 as the recording apparatus shown in these drawings strikes a large number of recording wires (not shown) of the recording head 18 against the sheet S via the ink ribbon 31 to record dots, thereby displaying an image including characters. This is a dot impact printer for printing. Here, the sheet S includes a passbook, a postcard, an envelope, and the like in addition to plain paper such as cut paper and continuous paper. In particular, the cut paper includes single copy paper, and the continuous paper includes continuous copy paper.
[0023]
As shown in FIG. 1, the printer 10 includes a printer main body 11 as a recording apparatus main body, a push tractor unit 12 and a discharge unit 13 that are detachably attached to the printer main body 11, and can also be detachably attached to the printer main body 11. 2, and an upper case and a lower case (not shown) that respectively cover the upper and lower portions of the printer main body 11.
[0024]
The printer main body 11 includes a base frame 14 as a main body frame, a sheet guide frame 15 (FIG. 2), a left side frame 16 and a right side frame 17, a printing mechanism unit 20 including a recording head 18 and a carriage 19, and a platen. 21, a lower sheet guide 22, an upper sheet guide 36, and a sheet conveying mechanism unit 23 including a driven roller 25 (FIG. 2).
[0025]
The base frame 14 and the seat guide frame 15 are arranged substantially in parallel as shown in FIG. 2, and the left side frame 16 and the right side frame 17 are erected on both ends of the base frame 14 and the seat guide frame 15, respectively. Fixed. As shown in FIG. 1, a carriage guide shaft 24 is bridged between the left side frame 16 and the right side frame 17 so as to be pivotable, and a platen 21 is bridged so as to be rotatable. Has been. The lower seat guide 22 is disposed between the left side frame 16 and the right side frame 17 and is fitted and fixed to the seat guide frame 15. In addition, a tractor unit mounting portion and a discharge unit mounting portion (not shown) to which the push tractor unit 12 and the discharge unit 13 can be mounted, respectively, are provided at the rear and upper portions of the left side frame 16 and the right side frame 17, respectively. Yes.
[0026]
The push tractor unit 12 shown in FIG. 1 and FIG. 2 feeds a continuous sheet as a sheet S to the sheet transport mechanism 23, and the sheet supply guide 34 feeds a single sheet as a sheet S (single sheet copy paper). In this case, the sheets are fed one by one) to the sheet conveying mechanism 23. The discharge unit 13 pulls out continuous paper or cut sheet paper from the sheet transport mechanism 23 to the outside of the printer 10.
[0027]
That is, as shown in FIG. 2, the continuous paper is guided to the lower sheet guide 22 of the sheet conveying mechanism 23 by the action of the pin 27 of the tractor belt 26 by the rotation of the tractor belt 26 of the push tractor unit 12. Then, it passes through a sheet conveying path 28 formed between the lower sheet guide 22 and the platen 21 toward the front of the platen 21 and is fed in the direction of the arrow α. When the push tractor unit 12 is not in operation, the cut sheet paper can be supplied from the sheet supply guide 34 one by one (or one by one) to the front of the platen 21 via the sheet conveyance path 28. Further, as described later, the continuous paper or the cut sheet on which characters or the like are recorded by the recording head 18 is pulled out from the platen 21 of the sheet transport mechanism 23 in the direction of the arrow β by the rotation of the discharge roller 29 of the discharge unit 13. . As a result, the continuous sheet or cut sheet is conveyed in the sub-scanning direction orthogonal to the later-described main scanning direction of the carriage 19.
[0028]
The carriage 19 shown in FIG. 1 is slidably inserted into the carriage guide shaft 24 and has a recording head 18 mounted thereon. Since the carriage guide shaft 24 is arranged in parallel with the platen 21, the carriage 19 is provided so as to be movable (running) in the main scanning direction that coincides with the axial directions of the platen 21 and the carriage guide shaft 24.
[0029]
By forward or reverse rotation of a carriage drive motor (not shown), the carriage 19 is guided to the carriage guide shaft 24 via the timing belt 30 (FIG. 2) and travels leftward or rightward in FIG. 1 in the main scanning direction.
[0030]
The recording head 18 includes a large number of recording wires, and an ink ribbon 31 is positioned in front of the protruding direction of these recording wires. While the recording head 18 travels in the main scanning direction together with the carriage 19, the recording wire protrudes and strikes the ink ribbon 31, and the ink on the ink ribbon 31 is conveyed between the platen 21 and the ink ribbon 31. An image including characters is recorded on the sheet S by being attached to the sheet S (continuous paper or cut paper).
[0031]
This recording operation by the recording head 18 is performed by recording one line by the recording wire of the recording head 18 while the carriage 19 travels leftward or rightward in the main scanning direction. When the sheet S is continuous paper, the platen 21, the push tractor unit 12 and the discharge unit 13 of the sheet conveying mechanism unit 23 shown in FIG. 2 are used. When the sheet S is cut sheet, the sheet conveying mechanism unit 23 is used. The platen 21, the driven roller 25, and the discharge unit 13 each carry the sheet S by a predetermined amount (for the normal line interval), and these operations are repeated.
[0032]
2 is an opening formed between the base frame 14 and the sheet guide frame 15, and is a bottom sheet for supplying the sheet S from below the printer 10 into the sheet transport mechanism 23. Supply port.
[0033]
Further, the control of the conveyance of the sheet S by driving the platen 21, the push tractor unit 12 and the discharge unit 13 and the control of the recording operation by the recording wires of the carriage 19 and the recording head 18 are a control board unit 33 (FIG. 2). ). For example, the control board 33 is disposed below the sheet guide frame 15 behind the printer body 11.
[0034]
As shown in FIGS. 2 and 3, the sheet conveying mechanism 23 as a conveying device includes the platen 21 as the first conveying roller and the pair of driven rollers as the second conveying rollers as described above. 25, the lower sheet guide 22 as a lower transport guide, and the upper sheet guide 36 as an upper transport guide. Between the platen 21 and the lower sheet guide 22, a sheet conveyance path 28 that conveys the sheet S as a conveyance target is formed.
[0035]
A plurality of driven rollers 25 are arranged along the longitudinal direction of the platen 21, and each is rotatably supported by the holder 45. The holder 45 is disposed in the lower seat guide 22 via a compression spring 46 so as to be movable up and down.
[0036]
When the continuous paper is conveyed by operating the release lever 47 (FIG. 1), the holder 45 descends against the urging force of the compression spring 46 to separate the driven roller 25 from the platen 21. When the cut sheet is conveyed by operating the release lever 47, the holder 45 is raised by the action of the urging force of the compression spring 46 to bring the driven roller 25 into contact (pressure contact) with the platen 21.
[0037]
When the continuous paper as the sheet S is supplied by the push tractor unit 12, the driven roller 25 is in a stopped state because it is separated from the platen 21. At this time, the continuous paper is transported toward the recording head 18 through the sheet transport path 28 by the platen 21 and the push tractor unit 12. Further, when the cut sheet as the sheet S is supplied by the sheet supply guide 34 or manually, the driven roller 25 is pressed against the platen 21 and rotates, so that the supplied single sheet is driven with the platen 21. The sheet is sandwiched between the rollers 25 and conveyed in the sheet conveyance path 28.
[0038]
The lower sheet guide 22 places the sheet S on the guide surface 37 and guides it to the platen 21 and the recording head 18. As shown in FIG. 3, the lower sheet guide 22 has a plurality of openings 49 in the longitudinal direction of the platen 21, and a pair of driven rollers 25 are accommodated in the openings 49.
[0039]
As shown in FIGS. 3 and 4, the upper seat guide 36 has one end fixed to the left side frame 16 and the other end fixed to the right side frame 17 using, for example, screws, and the lower seat guide 22. It is arrange | positioned facing. As shown in FIGS. 5 and 6, a plurality of guide pieces 38 extending toward the lower sheet guide 22 are formed in the upper sheet guide 36 at a predetermined interval in the longitudinal direction. These guide pieces 38 come into contact with the sheet S and guide the sheet S to the lower sheet guide 22 side.
[0040]
The upper sheet guide 36 is provided with an escape portion 39 that does not contact the sheet S between the adjacent guide pieces 38. As a result, as shown in FIG. 2, since the area where the upper sheet guide 36 contacts the sheet S conveyed between the lower sheet guide 22 and the upper sheet guide 36 is reduced, the conveyance resistance of the sheet S is reduced. The
[0041]
As shown in FIGS. 3 to 5, the guide piece 38 of the upper sheet guide 36 is positioned behind the printer main body 11 with respect to the driven roller 25 corresponding to the driven roller 25. As a result, the sheet S (single sheet) that is nipped and conveyed between the platen 21 and the driven roller 25 is favorably guided to the nip point between the platen 21 and the driven roller 25.
[0042]
Further, as shown in FIGS. 3 to 5, the lower sheet guide 22 also includes a sheet detection sensor 42 that detects the sheet S conveyed from the push tractor unit 12 or the sheet supply guide 34 toward the sheet conveyance path 28. Is installed. The sheet detection sensor 42 is disposed between the driven roller 25 and the left side frame 16 in the vicinity of the driven roller 25 located on the leftmost side in FIG. One of the plurality of guide pieces 38 is positioned in the vicinity corresponding to the sheet detection sensor 42 between the driven roller 25 and the sheet detection sensor 42. Since the sheet S is guided to the sheet detection sensor 42 side by the guide piece 38, the detection of the sheet S by the sheet detection sensor 42 is favorably performed.
[0043]
Therefore, according to the above embodiment, the following effects (1) to (3) are obtained.
[0044]
(1) Since a guide piece 38 extending toward the lower sheet guide 22 is formed in the upper sheet guide 36, the entire guide portion (FIG. 8) of the lower sheet guide 22 contacts the sheet S. Since the conveyance resistance of the sheet S can be reduced compared to the case where the sheet S is guided, the sheet S can be conveyed satisfactorily. In particular, when the sheet S is a continuous copy sheet, the upper sheet can be prevented from being displaced relative to the lower sheet by the upper sheet guide 36, so that the continuous copy sheet can be transported satisfactorily.
[0045]
(2) Since the guide piece 38 of the upper sheet guide 36 is disposed at a position corresponding to the sheet detection sensor 42 that is installed in the lower sheet guide 22 and detects the sheet S, the guide piece 38 removes the sheet S from the sheet. Since the sheet is guided to the detection sensor 42 side, the detection accuracy of the sheet S by the sheet detection sensor 42 can be improved.
[0046]
(3) A driven roller 25 that allows the sheet S to be nipped and conveyed with the platen 21 is housed and disposed in an opening 49 formed in the lower sheet guide 22. Since the guide piece 38 is disposed at a position corresponding to the driven roller 25, the sheet S can be guided to the nip point between the platen 21 and the driven roller 25 by the guide piece 38, so that the sheet S can be conveyed satisfactorily. .
[0047]
As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this.
[0048]
For example, in the above-described embodiment, the case of the printer 10 in which the platen 21 is disposed above the lower sheet guide 22 has been described. However, a flat base type printer in which the platen 21 is disposed below the lower sheet guide 22. The present invention may be applied to.
[0049]
【The invention's effect】
According to the transport apparatus according to the present invention, the transport load can be reduced and the transported body can be transported satisfactorily, and the detection accuracy of the transported body can be improved.
[0050]
According to the recording apparatus of the present invention, it is possible to reduce the conveyance load and to convey the sheet satisfactorily and improve the sheet detection accuracy.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a printer main body of a dot impact printer to which an embodiment of a recording apparatus according to the invention is applied.
FIG. 2 is a side sectional view showing the dot impact printer of FIG.
3 is a perspective view showing the printer main body of FIG. 1 with a platen and a discharge unit omitted. FIG.
4 is a plan view of the printer main body of FIG. 3. FIG.
5 is a perspective view showing the printer main body of FIG. 2 as viewed from the rear. FIG.
6 is a perspective view of the upper sheet guide shown in FIGS. 1 and 3. FIG.
FIG. 7 is a perspective view of a conventional printer body as viewed from the rear.
8 is a perspective view showing the upper sheet guide of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Printer 11 Printer main body 18 Recording head 19 Carriage 23 Sheet conveyance mechanism part (conveyance apparatus)
21 Platen (first transport roller)
22 Lower sheet guide (lower transported body guide)
25 Driven roller (second transport roller)
36 Upper sheet guide (Upper transport guide)
38 Upper sheet guide 42 Sheet detection sensor

Claims (3)

A first transport roller, a lower transported body guide for placing and guiding the transported body, and the lower transported body guide are disposed opposite to the lower transported body guide, and the transported body is disposed on the lower transported body guide side. In the transport device for transporting the transported body by the upper transported body guide formed with a plurality of guide pieces for guiding to the
A detector for detecting a transported body is provided in the lower transported body guide,
A second conveyance roller is provided that can convey the object to be conveyed with the first conveyance roller, and the second conveyance roller is accommodated in an opening formed in the lower conveyance object guide. The upper transported body guide guide piece corresponds to the second transport roller and is formed at an upstream position of the second transport roller,
One of the plurality of guide pieces is formed at a position corresponding to the side of the detector, and guides the object to be transported to the detector side. A recording head mounted on a travelable carriage records an image on a sheet conveyed by a conveying device,
The conveying device includes a first conveying roller, a lower sheet guide for placing and guiding a sheet, and a guide piece that is disposed to face the lower sheet guide and guides the sheet to the lower sheet guiding side. In a recording apparatus that conveys a sheet by means of a plurality of upper sheet guides,
A detector for detecting a sheet is provided in the lower sheet guide,
A second conveyance roller is provided that can convey the sheet while sandwiching the sheet with the first conveyance roller, and the second conveyance roller is accommodated in an opening formed in the lower sheet guide. The guide piece of the upper sheet guide corresponds to the second transport roller, and is formed at an upstream position of the second transport roller,
A recording apparatus, wherein one guide piece of the plurality of guide pieces is formed side by side and corresponding to the detector.   The recording apparatus according to claim 2, wherein the first transport roller is a platen, and the second transport roller is a driven roller.

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