JP3770052B2 - 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 including a paper jam detection roller.
[0002]
[Prior art]
In general, a recording apparatus having a paper jam detection roller that detects a jam of a continuous sheet by contacting a paper feed roller during continuous sheet conveyance is known.
[0003]
In this type of sheet, when the sheet is conveyed, the sheet is sandwiched between the paper feed roller and the paper jam detection roller, and the paper jam detection roller rotates. This rotation is detected by a paper jam detection sensor including a hall element. If the rotation of the paper jam detection roller is not detected despite the detection and the sheet feed request being output, a paper jam in the sheet feed path is detected.
[0004]
In the recording apparatus, conventionally, the paper feed roller is composed of a pair of drive rollers and a driven roller, and the paper jam detection roller is attached to the driven roller shaft in a free state in parallel with the driven roller, for example. There has been proposed a paper jam detection roller having a structure that abuts against a driving roller more strongly when a cut sheet is conveyed than when a continuous sheet is conveyed.
[0005]
[Problems to be solved by the invention]
When the above-described cut sheet is fed from the sheet feeding device, the drive roller may be temporarily rotated reversely for skew removal. In this case, as described above, when the pressure contact force between the opposing drive roller and the paper jam detection roller is strong, the leading edge of the cut sheet pushed back by the paper jam detection roller that rotates in reverse by the accompanying rotation breaks, and the paper There is a problem that jam occurs.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems of the prior art, and to provide a recording apparatus in which the leading edge of a cut sheet is pushed back and is not jammed during skew removal.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 is provided with a structure in which a paper jam detection roller that contacts the paper feed roller during continuous sheet conveyance and detects jamming of the continuous sheet is separated from the paper feed roller during cut sheet conveyance. It is what.
[0008]
According to the second aspect of the present invention, the paper jam detection roller is brought into contact with the paper feed roller by moving the release lever to the continuous sheet position during continuous sheet conveyance, and the release lever is moved to the cut sheet position during cut sheet conveyance. Accordingly, the paper jam detection roller is separated from the paper feed roller.
[0009]
According to a third aspect of the present invention, the paper jam detection roller holder according to the second aspect is moved down to a paper jam detection roller holder for supporting the paper jam detection roller by moving the release lever to a cut sheet position. The roller is separated from the paper feed roller.
[0010]
According to a fourth aspect of the present invention, the paper feed roller comprises a pair of drive rollers and a driven roller according to the second or third aspect, and the paper jam detecting roller is rotatably fitted to the inner ring and the outer periphery of the inner ring. The inner ring has a vertically long hole, and the driven roller shaft of the driven roller is fitted into the long hole.
[0011]
In the present invention, during continuous sheet conveyance, the paper jam detection roller comes into contact with the paper feed roller and detects jamming of the continuous sheet. On the other hand, when the cut sheet is conveyed, the paper jam detection roller is separated from the paper feed roller. For this reason, when performing skew removal during conveyance of the cut sheet, the leading edge of the cut sheet is not pushed back by the paper jam detection roller, and jamming does not occur in the cut sheet. Note that jam detection is not performed by the paper jam detection roller when the cut sheet is conveyed.
[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 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 configured to allow the manual insertion of the cut sheet K, and is installed on the rear side of the printer main body 11. And a sheet feeding device CSF (cut sheet feeder) that automatically supplies the cut sheet K.
[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 more than the sheet guide 53 in the state shown in FIG. Projects 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. 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 hanging portion 51D extending integrally downward is formed on the lower surface 51C of the flap 51. At the lower end of the hanging portion 51D of the flap 51, the 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]
FIG. 9 is a cross-sectional view including the paper jam detection roller 61 in the sheet conveying mechanism. As will be described later, the paper jam detection roller 61 is attached to the driven roller shaft 42 in parallel with the driven roller 43 so as to be freely rotatable.
[0041]
A magnet roller 63 in which N poles and S poles are alternately arranged is fixed on the side surface of the paper jam detection roller 61, and a paper jam detection sensor 64 including a Hall element that detects the N poles and S poles in the magnet roller 63. Is attached to the paper jam detection sensor holder 65. If the rotation of the paper jam detection roller 61 is not detected by the paper jam detection sensor 64 fixed to the paper jam detection sensor holder 65 even though the sheet control request is output from the printer control unit, the sheet feed path Paper jam is detected.
[0042]
In the present embodiment, as shown in FIG. 10, the paper jam detection roller 61 is supported by the paper jam detection roller holder 100.
[0043]
As shown in FIG. 11, the paper jam detection roller 61 has an inner ring 61A and an outer ring 61B that is rotatably fitted to the outer periphery of the inner ring 61A. Magnet rollers 63 in which S poles are alternately arranged are fixedly arranged. A longitudinally long slot 61C is formed in the inner ring 61A, and the driven roller shaft 42 of the driven roller 43 is loosely fitted in the slot 61C.
[0044]
As shown in FIG. 10, an elliptical protrusion 61D is formed on the side surface of the inner ring 61A so as to surround the long hole 61C.
[0045]
A substantially U-shaped groove portion 101 is formed on the upper portion of the paper jam detection roller holder 100, and an elliptical protrusion 61D is fitted into the groove portion 101, whereby the paper jam detection roller 61 is held. Has been. An opening 102 is formed in the lower portion of the paper jam detection roller holder 100, and the release shaft 46 passes through the opening 102. The paper jam detection roller holder 100 is biased upward by the spring force of the spring 103.
[0046]
10 and 11 show the tractor mode. In the tractor mode, the paper jam detection roller holder 100 is biased by the spring force of the spring 103 and the paper jam detection roller 61 is in contact with the driving roller 62 as shown in the figure.
[0047]
When the release shaft 46 is rotated in the cut sheet mode by the operation of the release lever 49, the paper jam detection roller holder 100 is moved to the spring of the spring 103 by the cam operation of the release shaft 46, as shown in FIGS. Depressed against force. When the paper jam detection roller holder 100 is pushed down, the paper jam detection roller 61 fitted in the groove 101 on the upper part thereof is lowered by its own weight, and the paper jam detection roller 61 is separated from the driving roller 62. In this case, as described above, since the driven roller shaft 42 is positioned at the upper position, the driven roller shaft 42 moves near the upper wall of the vertically long slot 61C.
[0048]
Next, the operation will be described.
[0049]
A cut sheet mode using the sheet feeding device CSF will be schematically described with reference to FIGS. The paper feeding device CSF includes a hopper 91 that holds a plurality of cut sheets K, a paper feed roller 92 that picks up and feeds the uppermost cut sheet K of the hopper 91 one by one, and the uppermost cut. A separation pad 93 for separating the cut sheet K that is double-fed together with the sheet K is provided. The paper feed roller 92 has a D-shaped cross section having a circular arc portion 92a that contacts the cut sheet K and a linear portion 92b that is separated from the cut sheet K, and at least the surface is made of a high wear material such as rubber. ing.
[0050]
One cut sheet K is fed to the paper feed roller 13 via the paper guide 98 during one rotation while being in contact with the arcuate portion 92a separation pad 93 of the paper feed roller 92. The paper guide 98 is provided with a paper detector PE that detects the leading edge of the cut sheet K to be fed.
[0051]
In this cut sheet mode, the cut sheet K is skewed by the cooperative operation of the driving roller 41 and the driven roller 43.
[0052]
In this skew removal, as shown in FIG. 15, the driving roller 41 is illustrated in a state where the leading edge of the cut sheet K bites between the driving roller 41 and the driven roller 43 by a predetermined length L1, and then the paper feeding roller 92 is stopped. This is performed by rotating (reversely rotating) in the direction opposite to the sheet feeding direction, that is, the direction opposite to the paper feeding direction. After this skew removal is completed, as shown in FIG. 16, the driving roller 41 and the driven roller 43 are rotated forward to perform a cueing operation with a fixed length L, and then the cut sheet K is recorded in accordance with the recording timing. The image is sent to the area of the head 69 and recorded. The cut sheet K recorded here is discharged through the transport roller unit 21 (FIG. 3).
[0053]
In the present embodiment, in the cut sheet mode using the sheet feeding device CSF, the paper jam detection roller holder 100 is pushed down against the spring force of the spring 103 as shown in FIGS. The paper jam detection roller 61 fitted in the groove 101 is lowered by its own weight. Therefore, the paper jam detection roller 61 is separated from the drive roller 62.
[0054]
According to this, when the skew removal is performed, the leading edge of the cut sheet K is not pushed back by the reverse rotation of the paper jam detection roller 61 as in the conventional case, and the occurrence of jam is suppressed.
[0055]
As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this.
[0056]
The means for separating the paper jam detection roller 61 from the drive roller 62 is not limited to the above embodiment, and may be a means using a separate actuator, for example.
[0057]
【The invention's effect】
In the present invention, since the paper jam detection roller is separated from the paper feed roller when the cut sheet is conveyed, the leading edge of the cut sheet is not pushed back by the paper jam detection roller when the skew is removed. Occurrence is suppressed.
[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 sheet transport mechanism including a paper jam detection sensor.
FIG. 10 is a diagram illustrating a paper jam detection sensor in a tractor mode.
FIG. 11 is a diagram illustrating a paper jam detection sensor in a tractor mode.
FIG. 12 is a diagram illustrating a paper jam detection sensor in a cut sheet mode.
FIG. 13 is a diagram illustrating a paper jam detection sensor in a cut sheet mode.
FIG. 14 is a diagram illustrating a cut sheet conveyance procedure.
FIG. 15 is a diagram for explaining a cut sheet conveyance procedure;
FIG. 16 is a diagram illustrating a cut sheet conveyance procedure.
[Explanation of symbols]
10 Printer (recording device)
11 Printer Main Body 12 Push Tractor Unit (Continuous Sheet Conveying Device)
13 paper feed roller 20 platen 21 transport roller unit 42 driven roller shaft 43 driven roller 61 paper jam detection roller 61A inner ring 61B outer ring 61C long hole 100 paper jam detection roller holder 101 groove 103 spring CSF paper feeder K cut sheet

Claims (4)

A paper jam detection roller that contacts the paper feed roller during continuous sheet conveyance and detects jamming of the continuous sheet;
A recording apparatus comprising a structure for separating the paper jam detection roller from the paper feed roller when a cut sheet is conveyed. The paper jam detection roller is brought into contact with the paper feed roller by moving the release lever to the continuous sheet position during continuous sheet conveyance, and the paper jam detection roller is moved by moving the release lever to the cut sheet position during cut sheet conveyance. A recording apparatus comprising a structure for separating from the paper feed roller. A paper jam detection roller holder for supporting the paper jam detection roller; and by moving the release lever to a cut sheet position, the paper jam detection roller holder is lowered to move the paper jam detection roller to the paper feed roller The recording apparatus according to claim 2, wherein the recording apparatus is separated from the recording apparatus. The paper feed roller is composed of a pair of driving roller and driven roller, the paper jam detection roller has an inner ring and an outer ring rotatably fitted on the outer periphery of the inner ring, and the inner ring has a vertically long slot. 4. The recording apparatus according to claim 2, wherein the driven roller shaft of the driven roller is fitted in the elongated hole.

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