JP2001278505A - Recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recorder capable of preventing a jamming from occurring by the sucking of the tip of a sheet into an opening of a sheet guide at the time of skew removal. SOLUTION: This recorder comprises a sheet conveying mechanism part for feeding a sheet from a paper sheet conveyer to a recording part. The sheet conveying mechanism part further comprises a paper jam detection roller 61 for detecting a jam of the sheet. The paper jam detection roller 61 is projected into the sheet conveying route through an opening 81 formed in the sheet guide 53, and a sheet guide rib 83 positioned near the paper jam detection roller 61 and projected generally to the same height as the sheet guide 53 is provided around the opening 81.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field 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 paper jam detecting roller.

[0002]

2. Description of the Related Art As shown in FIG. 15, a sheet feeding device (not shown) has a function of supplying a cut sheet K via a paper feed roller 71 to a recording section having a print head 72. A recording apparatus having a paper jam detection roller 73 for detecting the jam of the cut sheet K near the roller 71 is known. 74 is a platen.

In this type, the paper jam detection roller 73 protrudes into the sheet conveyance path through an opening 76 formed in the sheet guide 75, and when the cut sheet K is supplied, the paper jam detection roller 73 is activated. I go around in a free state.

The rotation of the paper jam detection roller 73 is detected by a paper jam detection sensor 78 composed of a Hall element fixed to the paper jam detection sensor holder 77, and a sheet feed request is output. ,
If the rotation of the paper jam detection roller 73 is not detected, a paper jam in the sheet feed path is detected.

By the way, when the cut sheet K is supplied, the paper feed roller 71 is temporarily reversely rotated in the direction of the arrow to remove the skew.

[0006]

However, in the above-described conventional recording apparatus, the size of the opening 76 formed in the sheet guide 75 is large. There is a problem in that the leading end of the cut sheet K pushed back by the paper jam detection roller 73 is guided deep into the opening 76 as shown by a dotted line, and paper jam occurs.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional technology, and to provide a recording apparatus in which the leading edge of a sheet is not guided into an opening of a sheet guide and jammed during skew removal. It is in.

[0008]

According to the first aspect of the present invention,
In a recording apparatus having a sheet conveying mechanism for supplying a sheet to a recording unit, and a sheet jam detecting roller for detecting a jam of the sheet in the sheet conveying mechanism, the paper jam detecting roller is formed in a sheet guide. And a sheet guide rib protruding into the sheet conveying path through the formed opening, and being provided near the paper jam detecting roller and protruding at substantially the same height as the sheet guide.

According to a second aspect of the present invention, in the first aspect, a pair of sheet guide ribs are arranged near both sides of the paper jam detecting roller.

[0010] The third aspect of the present invention is the first or second aspect.
In the above-described one, the sheet guide rib is formed integrally with the paper jam sensor holder.

In the present invention, since the sheet guide rib is provided near the paper jam detection roller and protrudes at substantially the same height as the sheet guide, the sheet guide rib is provided around the opening formed in the sheet guide. In addition, there is no possibility that the leading edge of the sheet is guided into the opening of the sheet guide to cause a jam.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a dot impact printer to which an embodiment of the recording apparatus according to the present invention is applied. The printer 10 is a printer that prints an image including characters by hitting a number of recording wires on a sheet via an ink ribbon (both not shown) and recording dots.

The printer 10 includes a printer main body 11 as a recording apparatus main body, a sheet supply guide 43 which is installed in front of the printer main body 11 and is configured to allow a cut sheet K to be manually inserted, And a sheet feeding device CSF which is provided on the rear side and automatically supplies the cut sheet K to the recording unit.

FIG. 2 shows the printer main body 11 from which the paper feeding device CSF has been removed. A push tractor unit (continuous sheet conveyance device) 12 that supplies a continuous sheet to a recording unit is disposed substantially below the sheet feeding device CSF.

The sheets include the cut sheet K cut to a predetermined length and a continuous sheet formed by connecting a plurality of sheets. The cut sheet K is, for example, a cut film such as a cut sheet, a copy sheet, or an OHP (overhead projector) sheet, and the continuous sheet is a continuous sheet.

The printer body 11 includes a recording head and a carriage as a recording mechanism, but is not shown here.

FIG. 3 shows a sheet transport mechanism of the printer main body 11. The sheet transport mechanism 30 includes a paper feed roller 13 connected to the push tractor unit 12 described above.
, A platen 20 and a transport roller unit 21. The recording head and the carriage as the recording mechanism are arranged above the platen 20 in the direction of the platen 2.
It is moved by scanning in the 0 axis direction.

FIG. 4 is a sectional view of the sheet transport mechanism 30 including the push tractor unit 12. The above-mentioned push tractor unit 12 supplies a continuous sheet (for example, continuous paper) to the above-mentioned sheet transport mechanism provided with the platen 20, and has a pair of left and right tractors 28 (FIG. 3).

The tractor 28 includes a tractor drive pulley (not shown) rotatably supported by a tractor drive shaft 29 and being slidable in the axial direction, and a tractor drive shaft 29 rotatable and slidable in the axial direction. A tractor belt 31 is wound around a tractor driven pulley (not shown) that is pivotally supported by the tractor, and is provided with a sheet holding lid 32.

The distance between the pair of tractors 28 can be adjusted according to the width of a continuous sheet (continuous paper) to be conveyed. Further, 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) formed on both sides in the width direction of the continuous sheet.

The sheet transport mechanism 30 includes the transport roller unit 21, the platen 20, and the paper feed roller 13, as described above. This paper feed roller 13
As shown in FIG. 5, the drive roller 41 includes a drive roller 41 fixed to a drive roller shaft 40 and a driven roller 43 attached to a driven roller shaft 42 so as to freely rotate. The rollers 41 and 43 form a pair. To convey the sheet.

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 driving wheel train 34. The tractor belt 31 of the push tractor unit 12 is similarly driven counterclockwise by the drive train wheel unit 34.

As shown in FIG. 6, the driven roller shaft 42 is fitted into an upper groove 44A of a driven roller holder 44 and is supported by the driven roller holder 44. The driven roller holder 44 is constantly 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.

The upper groove 44A of the driven roller holder 44
A pin 50 is fixed in the vicinity of, and a long hole 51A of the flap 51 is engaged with this pin 50. This flap 5
A U-shaped groove 51B is formed at one end of the flap.
The other end protrudes above the sheet guide 53 in the state shown in FIG.

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, and the spring force of the tension spring 52 causes the flap 51 to rotate clockwise about the pin 50 as a fulcrum. It is being rushed.

The driven roller holder 44 is formed with a U-shaped groove 44C opening downward, and a release shaft 46 is fitted in the groove 44C.

As shown in FIG. 5, the release shaft 46 has a shaft end 46A extending rightward in the drawing, and a shaft end 46A extending rightward in the drawing, as shown in FIG. , Pinion 47 are connected. This pinion 47 is rack 4
The base 48A of the rack 48 extends leftward in the figure 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.

A cam (not shown) is formed on the shaft of the release shaft 46. When the release shaft 46 is rotated to the continuous sheet position, as shown in FIG. The holder 44 is pushed down against the spring force of the spring 45. When this is depressed, 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 5
1 rotates clockwise, and the flap 51 retreats below the sheet guide 53.

In this state, the driven roller 43 is pressed against the drive roller 41 by the spring force of the tension spring 52, but the spring force of the tension spring 52 is set to be weak. weak.

As shown in FIG. 6 or 7, the shaft portion of the release shaft 46 has a portion 4 having a substantially Y-shaped cross section.
6B are provided. A depression 46C is formed in this portion 46B, and when the release shaft 46 rotates as described above, the position of the depression 46C is displaced as shown in FIG. 6 or FIG.

On the other hand, a lower portion 51D integrally extending downward is formed on the lower surface 51C of the flap 51. The lower end of the lower portion 51D of the flap 51 has a lower end of the release shaft 46 in the state shown in FIG. Control part 4 of part 46B
A stopper 51E that can contact the 6D is integrally formed.

According to this, in the state shown in FIG.
When a force for rotating the flap 51 clockwise acts, the stopper 51E comes into contact with the restricting portion 46D, and further rotation of the flap 51 is prevented.

When a cut sheet K such as a cut sheet or a copy sheet is supplied, the release lever 49 is moved to the cut sheet position, and the driven roller holder 44 is moved as described above.
The driven roller 4 is urged by the spring force of the compression spring 45.
3 comes into pressure contact with the drive roller 41, and the flap 51 projects upward from the sheet guide 53.

In this state, in the case of so-called manual feed,
After the cut sheet K is manually supplied from the front side of the printer main body 11, the transport roller unit 21 and the platen 20
And the paper feed roller 13 is rotated clockwise (the sheet supply motor is rotated in the reverse direction) to be conveyed from the front to the rear of the printer main body 11 in the direction shown by the arrow B in FIG.
Due to the counterclockwise rotation of the transport roller unit 21, the platen 20, and the paper feed roller 13 (the sheet supply motor rotates forward), the sheet is transported in the direction of arrow A from the rear of the printer body 11 to the front, and faces the platen 20. It is supplied to the recording unit including the print head 69 that has been printed.

When the cut sheet K is transported in the direction shown by the arrow B in FIG. 4, the push tractor unit 12 is located forward in the transport direction. However, in this case, as shown in FIG. 6, the flap 51 projects above the sheet guide 53, and is guided by the flap 51,
The cut sheet K is conveyed so as to ride on the push tractor unit 12 without colliding with the push tractor unit 12.

In the case of automatic feeding using the paper feeding device CSF,
As shown in FIG. 8, the cut sheet K is supplied in the direction of arrow C via the auxiliary roller 65 of the sheet feeding device CSF, and the cut sheet K is supplied to the transport roller unit 21 and the platen 20.
And the paper feed roller 13 is rotated in the counterclockwise direction (the sheet supply motor rotates forward), and is conveyed from the rear of the printer body 11 to the front in the direction of arrow A in FIG.
The print data is supplied to the recording unit including the print head 69 facing 0.

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, as shown in FIG. 7, the driven roller holder 44 is pushed down, and the flap 51 is moved to the sheet guide. It retreats below 53.

A continuous sheet R such as continuous paper is pushed by a push tractor 12 from the rear side of the printer
After being supplied in the direction (arrow A direction in FIG. 4), the paper feed roller 13 and the transport roller unit 21 move the same direction (FIG. 4).
(In the direction of arrow A), and is supplied to a recording unit including a print head 69 facing the platen 20.

FIG. 9 is a sectional view including the paper jam detecting roller 61 in the sheet conveying mechanism. The paper jam detection roller 61 is driven by the driven roller 4
3 and is freely rotatable in parallel.

As shown in FIG. 10, the paper jam detecting roller 61 is located between the driven roller 43 and the driven roller 43 fixed to the driving roller shaft 40 so as to face the driven roller 43. The roller 62 is located.

While the outer periphery of the driven roller 43 remains resin, the outer periphery of the drive rollers 41 and 62 fixed to the drive roller shaft 40 and the outer periphery of the paper jam detection roller 61 are provided with a rubber material. Large resistance is applied during sheet conveyance. A magnet roller 63 in which N poles and S poles are alternately arranged is fixedly arranged on the side surface of the paper jam detection roller 61. It 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 feed request is output, Paper jam is detected.

The sheet transport mechanism is covered with a sheet guide 53, as shown in FIG. An opening 81 is formed in the sheet guide 53, and the paper jam detection roller 61 projects through the opening 81 into the sheet conveyance path.

In this embodiment, a sheet guide rib 83 is formed near the paper jam detecting roller 61 and protrudes at substantially the same height as the sheet guide 53 around the opening 81. This seat guide rib 83
As shown in FIG. 10, are formed integrally with the paper jam sensor holder 65, and a pair is disposed near both sides of the paper jam detection roller 61.

Next, the operation will be described.

In the present embodiment, the sheet guide rib 8
3 functions in the cut sheet mode using the sheet feeding device CSF.

The cut sheet mode using the sheet feeding device CSF will be schematically described with reference to FIGS. The sheet feeder CSF includes a hopper 91 that holds a plurality of cut sheets K, a sheet feed roller 92 that picks up and feeds the top cut sheet K of the hopper 91 one by one, and a top cut sheet K. A separation pad 93 for separating the cut sheet K which is fed together with the sheet K. The paper feed roller 92 has a D-shaped cross section having an arc portion 92a in contact with the cut sheet K and a linear portion 92b separated from the cut sheet K, and at least the surface is made of a high wear material such as rubber. ing.

One cut sheet K is fed to the paper feed roller 13 via the paper guide 98 during one rotation while the paper feed roller 92 is in contact with the arcuate portion 92a of the separation pad 93. The paper guide 98 is provided with a paper detector PE for detecting the leading end of the cut sheet K to be fed.

In the cut sheet mode, the skew of the cut sheet K is performed by the cooperation of the drive roller 41 and the driven roller 43.

As shown in FIG. 13, the skew is removed by causing the leading end of the cut sheet K to bite between the driving roller 41 and the driven roller 43 for a predetermined length L1.
2 is stopped, the drive roller 41 is rotated (reverse rotation) in the direction shown in the drawing, that is, in the direction opposite to the sheet feeding direction. After completing the skew removal, as shown in FIG. 14, the drive roller 41 and the driven roller 43 are rotated in the normal direction to perform a cueing operation of a fixed length L, and then the cut sheet K is recorded in accordance with the recording timing. It is sent to the area of the head 69 to perform recording. The cut sheet K recorded here is discharged via the transport roller unit 21 (FIG. 3).

By the way, when performing skew removal,
As shown in FIG. 9, the driving roller 62 is also
The leading edge of the cut sheet K is pushed back by the reverse rotation of the paper jam detection roller 61 which is rotated by the drive roller 62 in order to rotate integrally with the paper sheet.

In the present embodiment, since the sheet guide ribs 83 are formed around the opening 81, even if the leading end of the cut sheet K is pushed back by the paper jam detection roller 61, the sheet guide ribs 83 hold the cut sheet K. 81, the paper jam is suppressed.

In order to hold the return of the leading end of the cut sheet K by the sheet guide ribs 83 during skew removal, the sheet guide ribs 83 must be connected to the paper jam detecting roller 6.
1 is desirably located in the vicinity. It is desirable to project at substantially the same height as the sheet guide 53. Further, it is desirable that a pair of the sheet guide ribs 83 be disposed near both sides of the paper jam detection roller 61. This is because the return of the leading end of the cut sheet K can be effectively suppressed by these configurations.

As described above, the present invention has been described based on the above embodiment, but the present invention is not limited to this.
In the above embodiment, the sheet guide rib 83 is formed integrally with the paper jam sensor holder 65. However, the present invention is not limited to this. For example, the sheet guide rib 83 may be screwed to another fixing portion.

[0056]

According to the present invention, a skew is provided at the periphery of the opening formed in the sheet guide because the sheet guide rib is provided near the paper jam detecting roller and protrudes at substantially the same height as the sheet guide. At the time of picking, there is no possibility that the leading edge of the sheet is guided into the opening of the sheet guide to cause a jam.

[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 present invention is applied.

FIG. 2 is a perspective view illustrating a printer main body from which a sheet feeding device CSF is removed.

FIG. 3 is a perspective view illustrating a sheet conveying mechanism of the printer body.

FIG. 4 is a sectional view of FIG. 3;

FIG. 5 is a perspective view showing a paper feed roller.

FIG. 6 is an enlarged cross-sectional view illustrating a sheet conveying mechanism.

FIG. 7 is an enlarged cross-sectional view illustrating a sheet conveying mechanism.

FIG. 8 is an enlarged cross-sectional view illustrating a sheet transport mechanism.

FIG. 9 is an enlarged cross-sectional view illustrating a sheet conveyance mechanism including a paper jam detection sensor.

FIG. 10 is a perspective view illustrating a sheet conveying mechanism including a paper jam detection sensor.

FIG. 11 is an enlarged cross-sectional view illustrating a sheet conveying mechanism including a paper jam detection sensor.

FIG. 12 is a diagram for explaining a procedure for conveying a cut sheet.

FIG. 13 is a diagram illustrating a cut sheet conveying procedure.

FIG. 14 is a diagram illustrating a procedure for conveying a cut sheet.

FIG. 15 is an enlarged sectional view showing a conventional sheet conveying mechanism.

[Explanation of symbols]

REFERENCE SIGNS LIST 10 printer (recording device) 11 printer main body 12 push tractor unit (continuous sheet transport device) 13 paper feed roller 20 platen 21 transport roller unit 53 sheet guide 61 paper jam detection roller 65 paper jam sensor holder 81 opening 83 sheet guide rib CSF paper feed Equipment K Cut Sheet

Claims (3)

[Claims] 1. A recording apparatus having a sheet conveying mechanism for supplying a sheet to a recording unit, the sheet conveying mechanism including a paper jam detecting roller for detecting a jam of the sheet. Protrudes into the sheet conveyance path through an opening formed in the sheet guide, and has a sheet guide rib located near the paper jam detection roller and protruding at substantially the same height as the sheet guide around the opening. Characteristic recording device. 2. The recording apparatus according to claim 1, wherein a pair of the sheet guide ribs are arranged near both sides of the paper jam detection roller. 3. The paper guide sensor according to claim 1, wherein the sheet guide rib is formed integrally with the paper jam sensor holder.
Or the recording device according to 2.