JP3758458B2 - Recording device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording apparatus such as a dot impact printer, and more particularly to a recording apparatus having a flap in the vicinity of a paper feed roller.
[0002]
[Prior art]
Conventionally, for example, as shown in FIG. 9, a tractor (continuous sheet conveying device) 72 that conveys a continuous sheet in a direction opposite to the conveyance direction of the cut sheet K to a position closest to the conveyance direction of the paper feed roller 71 of the cut sheet K. There is known a recording apparatus including 74 is a platen, 75 is a print head, and 76 is a release shaft.
[0003]
In this type of conventional recording apparatus, the sheet retracts between the tractor 72 and the paper feed roller 71 as indicated by the dotted line during continuous sheet conveyance, and protrudes as indicated by the solid line during cut sheet conveyance so that the cut sheet K is moved to the tractor 72. A flap 77 that flips up the cut sheet K is provided so as not to collide with.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional recording apparatus, when the cut sheet K is relatively high in rigidity, such as thick paper, the flap 77 is pushed by the cut sheet K and rotates in the clockwise direction, as shown by the dotted line. There is a problem of doing.
[0005]
When the flap 77 moves backward, there is a problem that the cut sheet K collides with the tractor 72 and causes jamming.
[0006]
Accordingly, an object of the present invention is to provide a recording apparatus in which a flap is not pushed back by being pushed by the cut sheet even when the cut sheet has a relatively high rigidity such as a passbook or cardboard. is there.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 is provided with a continuous sheet conveying device that conveys a continuous sheet in a direction opposite to the conveying direction of the cut sheet at a position immediately in front of the conveying direction of the paper feed roller of the cut sheet. The paper feed roller is configured in a recording apparatus including a flap that retreats during continuous sheet conveyance and protrudes during conveyance of a cut sheet and flips up the cut sheet so as not to collide with the continuous sheet conveyance apparatus between the apparatus and the paper feed roller. A release shaft configured to be rotatable so as to adjust the pressure contact force between the pair of conveying rollers, and the flap is configured to retract during continuous sheet conveyance and project during cut sheet conveyance by rotation of the release shaft. The flap that protrudes when the cut sheet is conveyed is pushed by the cut sheet and does not move backward between the release shaft and the flap. Characterized in that a braking member.
[0008]
The invention according to claim 2 is the one according to claim 1, wherein the restricting member includes a stopper formed on the flap, and the shaft portion of the release shaft serves as a stopper when the release shaft rotates to the continuous sheet position. It is characterized in that a restricting portion is provided so as to be able to come into contact with the stopper when it is rotated to the cut sheet position without contacting.
[0010]
In general, when the cut sheet is a passbook or cardboard, a force for retracting the flap is generated by the rigidity of the cut sheet. When the flap moves backward, the cut sheet collides with the continuous sheet conveying device, causing jamming and the like.
[0011]
In these inventions, even if a force for retreating the flap is generated, the restricting member prevents further retreat of the flap, so that the protruding position of the flap is maintained. Therefore, the cut sheet does not collide with the continuous sheet conveying device, and the occurrence of jamming or the like is prevented.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0013]
FIG. 1 is a perspective view showing a dot impact printer to which an embodiment of a recording apparatus according to the present invention is applied. The printer 10 is a printer that prints an image including characters by hitting a large number of recording wires onto a sheet via an ink ribbon (both not shown) to record dots.
[0014]
The printer 10 includes a printer main body 11 serving as a recording apparatus main body, a sheet supply guide 43 that is installed on the front side of the printer main body 11 and is configured to allow a cut sheet K to be manually inserted, and on the rear side of the printer main body 11. And a sheet feeding device CSF that is installed and automatically supplies the cut sheet K to the recording unit.
[0015]
FIG. 2 shows the printer main body 11 with the paper feeding device CSF removed. A push tractor unit (continuous sheet conveying device) 12 that supplies continuous sheets to the recording unit is disposed substantially directly below the sheet feeding device CSF.
[0016]
The sheet includes the cut sheet K cut to a predetermined length and a continuous sheet in which a plurality of sheets are connected. Examples of the cut sheet K include cut films such as cut sheet paper, copy paper, and OHP (overhead projector) sheets, and continuous sheets include continuous sheets.
[0017]
The printer main body 11 includes a recording head and a carriage as a recording mechanism unit, but the illustration is omitted here.
[0018]
FIG. 3 shows a sheet conveying mechanism section of the printer main body 11. The sheet transport mechanism 30 includes a paper feed roller 13, a platen 20, and a transport roller unit 21 that are connected to the push tractor unit 12. Note that the recording head and the carriage as the recording mechanism section are moved by scanning above the platen 20 in the axial direction of the platen 20.
[0019]
FIG. 4 is a cross-sectional view of the sheet conveying mechanism unit 30 including the push tractor unit 12. The above-described push tractor unit 12 supplies a continuous sheet (for example, continuous paper) to the sheet conveying mechanism section provided with the platen 20, and has a pair of left and right tractors 28 (FIG. 3).
[0020]
These tractors 28 include a tractor drive pulley (not shown) that is rotatably supported on the tractor drive shaft 29 and is slidable in the axial direction, and a tractor 28 that is rotatably supported on the tractor guide shaft 30 and slidable in the axial direction. A tractor belt 31 is wound around the tractor driven pulley (not shown) and a sheet pressing lid 32 is provided.
[0021]
The distance between the pair of tractors 28 can be adjusted according to the width dimension of the continuous sheet (continuous paper) to be conveyed. In addition, a plurality of pins (not shown) protruding from the entire outer periphery of the tractor belt 31 can be engaged with pin holes (not shown) drilled on both sides in the width direction of the continuous sheet.
[0022]
As described above, the sheet conveyance mechanism unit 30 includes the conveyance roller unit 21, the platen 20, and the paper feed roller 13. As shown in FIG. 5, the paper feed roller 13 includes a driving roller 41 fixed to the driving roller shaft 40 and a driven roller 43 attached to the driven roller shaft 42 so as to be freely rotatable. 43 are configured to convey the sheet in pairs.
[0023]
As shown in FIG. 4, the transport roller unit 21, the platen 20, and the paper feed roller 13 are driven to rotate clockwise or counterclockwise by a drive wheel train 34. Similarly, the tractor belt 31 of the push tractor unit 12 is driven counterclockwise by the drive wheel train 34.
[0024]
As shown in FIG. 6, the driven roller shaft 42 is fitted into the upper groove 44 </ b> A of the driven roller holder 44 and is supported by the driven roller holder 44. The driven roller holder 44 is always urged upward by the spring force of the compression spring 45. In this state, the driven roller 43 is pressed against the driving roller 41 with a strong force by the spring force of the compression spring 45.
[0025]
A pin 50 is fixed in the vicinity of the upper groove 44 </ b> A of the driven roller holder 44, and a long hole 51 </ b> A of the flap 51 is engaged with the pin 50. One end of the flap 51 is formed with a U-shaped groove 51B that opens upwardly into which the driven roller shaft 42 is fitted. The other end of the flap 51 is formed by the sheet guide 53 in the state shown in FIG. Also protrudes upward.
[0026]
A tension spring 52 is stretched between the lower surface 51C of the flap 51 and the lower piece 44B of the driven roller holder 44. By the spring force of the tension spring 52, the flap 51 is urged clockwise with the pin 50 as a fulcrum. Yes.
[0027]
The driven roller holder 44 is formed with a U-shaped groove 44C that opens downward, and a release shaft 46 is fitted in the groove 44C.
[0028]
As shown in FIG. 5, the shaft end 46A of the release shaft 46 extends rightward in the figure, and the shaft end 46A extended rightward in the figure has a pinion 47 as shown in FIG. Are connected. The pinion 47 meshes with a rack 48, and a base 48A of the rack 48 extends leftward in the drawing and is connected to a release lever 49. When the release lever 49 moves in the directions of arrows A and B, the rack 48 moves in the same direction, and the release shaft 46 rotates via the pinion 47.
[0029]
A cam (not shown) is formed on the shaft portion of the release shaft 46. When the release shaft 46 is rotated to the continuous sheet position, the driven roller holder 44 is moved by the action of the cam as shown in FIG. The spring 45 is pushed down against the spring force of the spring 45. When this is pushed down, the position of the lower piece 44B of the driven roller holder 44 is lowered, so that it is pulled by the tension spring 52 and the flap 51 is rotated in the clockwise direction, and the flap 51 is retracted downward from the sheet guide 53. To do.
[0030]
In this state, although the driven roller 43 is pressed against the drive roller 41 by the spring force of the tension spring 52, the spring force of the tension spring 52 is set weak, so that the pressure contact force by the driven roller 43 is weak.
[0031]
The shaft portion of the release shaft 46 is provided with a portion 46B having a substantially Y-shaped cross section as shown in FIG. 6 or FIG. The recess 46C is formed in the portion 46B, and when the release shaft 46 rotates as described above, the position of the recess 46C is displaced as shown in FIG. 6 or FIG.
[0032]
On the other hand, a drooping portion 51D extending integrally downward is formed on the lower surface 51C of the flap 51, and the lower end of the drooping portion 51D of the flap 51 has a portion 46B of the release shaft 46 in the state shown in FIG. A stopper 51E that can come into contact with the restricting portion 46D is integrally formed.
[0033]
According to this, in the state shown in FIG. 6, when a force that rotates the flap 51 in the clockwise direction is applied, the stopper 51E comes into contact with the restricting portion 46D, and further rotation of the flap 51 is prevented.
[0034]
When a cut sheet K such as cut paper or copy paper is supplied, the release lever 49 is moved to the cut sheet position, and the driven roller holder 44 is urged by the spring force of the compression spring 45 as described above. The driven roller 43 comes into pressure contact with the driving roller 41, and the flap 51 projects upward from the sheet guide 53.
[0035]
In this state, in the case of so-called manual feeding, the cut sheet K is manually supplied from the front side of the printer main body 11, and then the conveyance roller unit 21, the platen 20, and the paper feed roller 13 are rotated in the clockwise direction (the sheet supply motor is 4, the printer main body 11 is conveyed in the direction indicated by arrow B in FIG. 4, and the conveyance roller unit 21, the platen 20, and the paper feed roller 13 are rotated counterclockwise (sheet supply). The motor is forwardly rotated) and is conveyed in the direction of arrow A from the rear to the front of the printer body 11 and supplied to a recording unit including a print head 69 facing the platen 20.
[0036]
When the cut sheet K is transported in the direction indicated by the arrow B in FIG. 4, the push tractor unit 12 is positioned in front of the transport direction. However, in this case, as shown in FIG. 6, since the flap 51 protrudes upward from the sheet guide 53, the cut sheet K does not collide with the push tractor unit 12 by being guided by the flap 51. It is conveyed so that it rides up.
[0037]
In the case of automatic supply using the sheet feeding device CSF, as shown in FIG. 8, the cut sheet K is supplied in the direction of arrow C through the auxiliary roller 65 of the sheet feeding device CSF. 4, the platen 20 and the paper feed roller 13 are rotated in the counterclockwise direction (the sheet supply motor is forwardly rotated) from the rear to the front of the printer body 11 in the direction of arrow A in FIG. A recording unit including the print head 69 is supplied.
[0038]
On the other hand, when a continuous sheet such as continuous paper is supplied, the release lever 49 is moved to the continuous sheet position, and the driven roller holder 44 is pushed downward as shown in FIG. Retreat downward.
[0039]
A continuous sheet R such as continuous paper is supplied from the rear side of the printer main body 11 by the push tractor 12 in the direction of arrow D (the direction of arrow A in FIG. 4), and then in the same direction by the paper feed roller 13 and the transport roller unit 21. It is conveyed in the direction of arrow A in FIG. 4 and supplied to a recording unit including a print head 69 facing the platen 20.
[0040]
In the above configuration, as shown in FIG. 6, when the cut sheet K is manually fed, for example, if the cut sheet K is a passbook or cardboard, the flap 51 is rotated clockwise by the rigidity of the cut sheet K. Force to generate.
[0041]
In this case, when the flap 51 moves backward, the cut sheet K collides with the push tractor unit 12 and causes jamming, for example.
[0042]
In the present embodiment, even when a force that rotates the flap 51 in the clockwise direction is generated, as described above, the stopper 51E comes into contact with the restricting portion 46D, and further rotation of the flap 51 is prevented. The protruding position of the flap 51 is maintained.
[0043]
Therefore, the cut sheet K does not collide with the push tractor unit 12, and jamming or the like is prevented.
[0044]
The stopper 51E and the restricting portion 46D constitute a restricting member, but the present embodiment is not limited to this structure. For example, in the state of FIG. 6, any configuration may be used as long as the rotation can be prevented so that the flap 51 is not rotated clockwise by being pushed by the cut sheet K.
[0045]
However, in the above-described embodiment, since the release shaft 46 is rotated and the restricting portion 46D is rotated to a position facing the stopper 51E, the rotation of the flap 51 can be prevented with an extremely simple configuration.
[0046]
As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this.
[0047]
【The invention's effect】
In the present invention, even if a force for retreating the flap is generated, the restricting member prevents further retreat of the flap, so that the protruding position of the flap is maintained. Therefore, the cut sheet does not collide with the continuous sheet conveying device, and the occurrence of jam is prevented.
[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 perspective view illustrating a printer main body from which a paper feeding device CSF is removed.
FIG. 3 is a perspective view illustrating a sheet conveying mechanism unit of the printer main body.
4 is a cross-sectional view of FIG.
FIG. 5 is a perspective view showing a paper feed roller.
FIG. 6 is an enlarged cross-sectional view illustrating a sheet conveying mechanism unit.
FIG. 7 is an enlarged cross-sectional view illustrating a sheet conveyance mechanism unit.
FIG. 8 is an enlarged cross-sectional view illustrating a sheet conveying mechanism.
FIG. 9 is an enlarged cross-sectional view illustrating a conventional sheet conveying mechanism.
[Explanation of symbols]
10 Printer (recording device)
11 Printer Main Body 12 Push Tractor Unit (Continuous Sheet Conveyor)
13 Paper Feeding Roller 20 Platen 21 Conveying Roller Unit 46 Release Shaft 46D Restricting Unit 51 Flap 51E Stopper CSF Paper Feeding Device K Cut Sheet

Claims (2)

A continuous sheet conveyance device that conveys a continuous sheet in a direction opposite to the conveyance direction of the cut sheet is provided at a position immediately in front of the conveyance direction of the paper feed roller of the cut sheet, and between the continuous sheet conveyance device and the paper feed roller. In a recording apparatus provided with a flap that retreats at the time of continuous sheet conveyance and protrudes at the time of conveyance of the cut sheet and does not collide with the continuous sheet conveyance apparatus,
A release shaft configured to be rotatable so as to adjust the pressure contact force of the pair of conveyance rollers constituting the paper feed roller, and the flap is retracted during continuous sheet conveyance by the rotation of the release shaft and is conveyed during cut sheet conveyance; A recording apparatus, characterized in that it is configured to project, and a regulating member is provided between the release shaft and the flap so that the flap projecting when the cut sheet is conveyed is not pushed backward by the cut sheet.   The restricting member includes a stopper formed on a flap, and the shaft portion of the release shaft does not contact the stopper when the release shaft rotates to the continuous sheet position, but contacts the stopper when the release shaft rotates to the cut sheet position. The recording apparatus according to claim 1, wherein a restricting portion is provided so as to be freely accessible.

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