JP2002347991A - Sheet supply guide for recording device, and recoding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely correct skewing of the sheet without generating a malfunction such as a jam of the sheet. SOLUTION: In a sheet supply guide 43 for a recording device having a sheet skewing correcting mechanism 46 for correcting the skewing of the sheet, while supplying the sheet to the recording device, the sheet skew correcting mechanism is provided with a pair of an upper driving roller 51 and a lower driving roller 52. The upper driving roller 51 has a roller part 57 fitted on an upper roller shaft 55 with a looseness in the radial direction and energized to the lower driving roller 52 side by a coil spring 59 through a spring holder 60, and has a clutch part 58 fitted in the roller part to be integrally rotated with the upper roller shaft 55.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a sheet supply guide of a recording apparatus for supplying a sheet into a recording apparatus main body of the recording apparatus, and a recording apparatus provided with the sheet supply guide.

[0002]

2. Description of the Related Art In a recording apparatus, while a carriage on which a recording head is mounted travels along a platen, the recording head is supplied from a sheet supply guide and conveyed between the recording head and the platen. In addition, a dot impact printer that records an image including characters and the like is known.

The above-mentioned sheet supply guide supplies a cut sheet to the inside of the printer body of the printer. Some sheet supply guides include a sheet skew correcting mechanism for correcting skew of a manually inserted cut sheet. As a sheet supply guide provided with such a sheet skew correction mechanism, a first related art described in Japanese Patent No. 2935262 and a second related art described in US Pat. No. 5,947,471 are known.

The sheet skew correcting mechanism of the sheet supply guide according to the first prior art has a plurality of protrusions provided integrally with a shaft disposed above a sheet conveying surface. When the cut sheet is carried into the sheet conveying surface, the shaft rotates to rotate a plurality of protrusions, and the rotating protrusion comes into contact with one side of the sheet, and conveys the cut sheet to the printer body side, and the cut sheet The skew of the cut sheet is corrected by abutting the leading end of the sheet on the transport roller (stopped state) of the printer body.

The skew correcting mechanism of the sheet supply guide in the second prior art described above sandwiches a skewed cut sheet by a pair of upper and lower drive rollers, and abuts the tip of the cut sheet against a shutter. The skew of the cut sheet is corrected. In the second prior art, one of the pair of driving rollers is provided so as to be able to bend and deform in the radial direction, and the restoring force of this bending deformation becomes a load acting on the sheet, and The cut sheet is held between the drive rollers.

[0006]

However, in the first prior art as described above, when the skew is corrected, the rotating projections contact only one side of the cut sheet to apply a conveying force to the sheet. Is especially copy paper,
In some cases, a difference occurs in the conveying force between the paper that contacts the rotating protrusion and the paper that does not contact the rotating protrusion, and only the paper that contacts the protrusion is conveyed. As a result, the sheet skew correction cannot be performed with high accuracy, but the sheet may be jammed (paper jam).

In the second prior art, the restoring force of the bending deformation of one of the drive rollers is a load acting on the cut sheet. However, this load is unstable, and the cut sheet is securely held between the pair of drive rollers. May not be pinched. Therefore, the skew correction of the sheet by these drive rollers may be insufficient.

An object of the present invention has been made in view of the above circumstances, and a sheet supply guide of a recording apparatus capable of surely performing skew correction of a sheet without causing a problem such as a sheet jam. And a recording apparatus provided with the sheet supply guide.

[0009]

According to a first aspect of the present invention, there is provided a sheet supply guide of a recording apparatus having a sheet skew correction mechanism for feeding a sheet to the recording apparatus and correcting a skew of the sheet. The sheet skew correction mechanism includes a pair of drive rollers. One of the drive rollers is fitted to the shaft with a play in the radial direction, and is disposed by being urged by the coil spring toward the other drive roller. And a power transmission means engaged with the roller portion and provided integrally with the shaft so as to rotate integrally with the shaft.

According to a second aspect of the present invention, in the first aspect of the invention, the coil spring is disposed between a spring holder slidable on a roller and a cover. Things.

[0011] According to a third aspect of the present invention, the recording head comprises:
While traveling along the platen, an image is recorded on the sheet supplied from the sheet supply guide and conveyed to the platen, and the sheet supply guide corrects the skew of the sheet. In the recording apparatus, the sheet skew correction mechanism of the sheet supply guide includes a pair of drive rollers, and one of the drive rollers is fitted to the shaft with play in the radial direction, and is driven by a coil spring. And a power transmission means engaged with the roller and provided integrally with the shaft so as to rotate integrally therewith. It is assumed that.

According to a fourth aspect of the present invention, in the third aspect of the invention, the coil spring in the sheet supply guide is disposed between a spring holder slidably in contact with the roller and the cover. It is characterized by the following.

The first to fourth aspects of the present invention have the following effects.

Since the sheet skew correction mechanism includes a pair of drive rollers, even if the sheet is a copy sheet, the pair of drive rollers exert a conveying force on both sides of the copy sheet. For this reason, it is possible to prevent a paper jam (sheet jam) resulting from the conveyance force acting on only one side of the copy paper.

Further, since one of the driving rollers has a roller portion urged toward the other driving roller by the urging force of the coil spring, the load acting on the sheet from the roller portion of the one driving roller is stable. And set with high accuracy. As a result, skew correction of the sheet by the pair of drive rollers can be reliably performed.

[0016]

Embodiments 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. FIG. 2 is a perspective view showing a printer main body of the printer of FIG. FIG. 3 is a side sectional view of the printer main body of FIG.

The printer 10 as a recording apparatus shown in these figures records characters by striking a large number of recording wires of a recording head onto a sheet via an ink ribbon (both not shown) to record dots. It is a dot impact printer that records images.

The printer 10 includes a printer main body 11 as a recording apparatus main body, a push tractor unit 12 mounted on the printer main body 11, an upper case 13A and a lower case 13B respectively covering the upper and lower parts of the printer main body 11, A sheet supply guide 43 that is provided on the front side of the main body 11 and supplies the cut sheet K into the printer main body 11.

The printer body 12 is housed in an upper case 13A and a lower case 13B which are joined to each other.
An operation panel 44 is provided on the upper case 13A. Further, the sheet supply guide 43 is provided on the front side of the printer main body 12, and the push tractor unit 12 is provided on the rear side.
Each is detachably mounted.

The sheets include the cut sheet K cut to a predetermined length and a continuous sheet formed by connecting a plurality of sheets. As the cut sheet K, for example, a cut sheet,
There are cut-sheet copy paper or cut film, and continuous sheets include continuous single-sheet paper and continuous copy paper.

As shown in FIG. 3, the printer main body 11 includes a base frame 14, a main frame 15, a left side frame 16 and a right side frame 17 as a main body frame, a recording head 18 and a carriage 19 as a recording mechanism. And a platen 2 as a sheet transport mechanism
0, sheet guide 25, first transport roller 21, second transport roller 22, third transport roller 23, and fourth transport roller 24
And is configured.

Base frame 14 and main frame 1
As shown in FIG. 2, a left side frame 16 and a right side frame 17 are fixed upright at approximately both ends of 5.
These left side frame 16 and right side frame 17
Between the lower carriage shaft 26 and the upper carriage shaft 27
(FIG. 3) is suspended at a predetermined distance in the vertical direction. Of these, the lower carriage shaft 26 is
And is rotatably supported by the right side frame 17. A platen 20 is bridged between the left side frame 16 and the right side frame 17 so as to be rotatable, and a seat guide 25 is fixedly provided.

The push tractor unit 12 shown in FIG.
Is to be supplied to the above-described sheet transport mechanism section having
It has a pair of left and right tractors 28. These tractors 2
Reference numeral 8 denotes a tractor drive pulley (not shown) rotatably supported on the tractor drive shaft 29 so as to be integrally rotatable and axially slidable, and a rotatably and axially slidably supported tractor guide shaft (not shown). A tractor belt 31 is wound around the tractor driven pulley (not shown), and a sheet holding lid 32 is provided.

The distance between the pair of tractors 28 can be adjusted according to the width of a continuous sheet (continuous paper) to be conveyed. Also, a plurality of pins 33 protruding from the entire outer periphery of the tractor belt 31 can be engaged with holes (not shown) formed on both sides in the width direction of the continuous sheet.

The sheet transport mechanism including the platen 20 is provided with a first transport roller 21 and a second
The transport roller 22 is located in front of the printer main body 11, and the third transport roller 23 and the fourth transport roller 24 are located in the printer main body 1.
1 are arranged on the rear side. Further, the first transport roller 21 and the second transport roller 22 are arranged vertically, and the third transport roller 23 and the fourth transport roller 24 are arranged vertically to form a pair.

The first transport roller 21 and the third transport roller 23 are disposed below the sheet guide 25 together with the platen 20, and the second transport roller 22 and the fourth transport roller 24 are disposed above the sheet guide 25. Is done. The upper portions of the platen 20, the first transport roller 21, and the third transport roller 23 project above the sheet guide 25. In addition, a sheet holding plate 37 that holds a sheet between the sheet guide 25 and the sheet guide 25 is provided on the front side of the printer body 11 in the sheet guide 25.

Platen 20, first conveying roller 21, second
The transport roller 22, the third transport roller 23, and the fourth transport roller 24 are driven to rotate clockwise (CW) or counterclockwise (CCW) in FIG. 3 by the drive train wheel unit 34 (FIG. 2). The tractor belt 31 of the push tractor unit 12 is similarly driven counterclockwise by the drive train wheel unit 34.

The drive wheel train 34 shown in FIG. 2 is installed on one of the left side frame 16 and the right side frame 17, for example, on the right side frame 17. The drive wheel train unit 34 includes a motor pinion 36 that is fixed to the drive shaft of a sheet conveyance motor 35 that can rotate forward or reverse, and is integrally rotated. The driving force from the motor pinion 36 is applied to the platen 20, the first transport roller 21, the second transport roller 22, the third transport roller 23 via a winding transmission mechanism and a gear mechanism.
Fourth transport roller 24 and push tractor unit 12
Can be transmitted to

A cut sheet K such as a single cut sheet or a single cut copy sheet is manually supplied from the front side of the printer body 11 via a sheet supply guide 43, and then, as shown in FIG. , The clockwise rotation of the first transport roller 21 and the third transport roller 23, and the second transport roller 2
2. Due to the counterclockwise rotation of the fourth conveying roller 24, the sheet is conveyed in the direction of arrow A from the front to the rear of the printer main body 11, and the platen 20, the first conveying roller 21 and the third conveying roller 23 Clockwise rotation, and second
The clockwise rotation of the transport roller 22 and the fourth transport roller 24 transports the printer body 11 from the rear to the front in the direction of arrow B.

On the other hand, a continuous sheet such as continuous paper is supplied by the push tractor unit 12 from the rear side of the printer body 11 in the direction of arrow B, and then the platen 20, the first transport roller 21, the second transport roller 22, 3 transport rollers 2
The same direction (arrow B direction) by the third and fourth transport rollers 24
Transported to

As a result, the cut sheet K and the continuous sheet are conveyed in the sub-scanning direction of the carriage 19, which is orthogonal to the main scanning direction described later.

As shown in FIG. 2, the carriage 19 has a lower carriage shaft 26 and an upper carriage shaft 27.
(FIG. 3) while being slidably inserted into the recording head 1.
8 is mounted. Since the lower carriage shaft 26 and the upper carriage shaft 27 are arranged parallel to the platen 20, the carriage 19 travels in the main scanning direction that matches the axial direction of the platen 20, the lower carriage shaft 26, and the upper carriage shaft 27 ( Scanning).

The carriage 19 is connected to a timing belt 39 (FIG. 3) which is reciprocated by the forward or reverse rotation of the carriage drive motor 38. Accordingly, the carriage 19 is guided by the lower carriage shaft 26 and the upper carriage shaft 27 via the timing belt 39 by forward or reverse rotation of the carriage drive motor 38, and is scanned leftward or rightward in FIG. 2 in the main scanning direction. You. Here, the carriage drive motor 38 is configured by, for example, a stepping motor together with the sheet conveyance motor 35.

Also, the carriage 19 has a structure shown in FIGS.
As shown in FIG. 1, a cartridge holder 40 is provided, and a ribbon cartridge (both not shown) containing an ink ribbon is mounted on the cartridge holder 40. Further, the carriage 19 is provided with a ribbon mask holder 41 for protecting the ink ribbon in the ribbon cartridge from a sheet (a cut sheet K or a continuous sheet) conveyed in contact with the upper peripheral surface of the platen 21. The ink ribbon in the ribbon cartridge is inserted into the cartridge holder 4
0, the recording head 1 is moved by the ribbon winding shaft 42 set at
Eight recording wires are provided so as to be movable in front of them.

The recording head 18 has a large number of recording wires (not shown), and the ink ribbon is located in front of the recording wires in the projecting direction as described above. Recording head 1
8, while being scanned in the main scanning direction together with the carriage 19, the recording wire is projected and hit against the ink ribbon,
The ink of the ink ribbon is attached to a sheet (cut sheet K or a continuous sheet) conveyed between the platen 20 and the recording head 18, and an image including characters is recorded on the sheet.

The recording operation by the recording head 18 is such that one line is recorded by the recording wire of the recording head 18 while the carriage 19 is scanned leftward or rightward in the main scanning direction, and every time this one line is recorded. If the sheet is a cut sheet K, the sheet transport mechanism (the platen 20, the first transport roller 21, the second transport roller 22,
When the sheet is a continuous sheet, the sheet conveying mechanism and the push tractor unit 12 respectively convey the sheet by a predetermined length (normal line spacing). Is repeated.

By the way, as described above, the printer body 11
As shown in FIGS. 3 to 5, the sheet supply guide 43 for supplying the cut sheet K into the above-described sheet transport mechanism section includes a sheet transport surface 45, a sheet skew correction mechanism 46, a sheet detection sensor 47 (FIG. 6), It has an upper cover 48 and a lower cover 49. The cut sheet K is transported on the sheet transport surface 45. Further, the lower cover 49 covers the entire area below the sheet conveying surface 45, and the upper cover 48
Part of the upper part of the sheet conveying surface 45 (the upper drive roller 5 described later)
1 and the upper part of the swing lever 73).

The sheet detection sensor 47 is installed above the sheet conveying surface 45 and near the downstream side of an upper drive roller 51 and a lower drive roller 52, which will be described later, and detects that the leading end of the cut sheet K has reached this position. This is a transmission type optical sensor for detecting.

The sheet skew correcting mechanism 46 corrects the skew of the cut sheet K manually inserted on the sheet conveying surface 45, and includes a pair of an upper driving roller 51 and a lower driving roller 52, a sheet feeding motor. 50, a gear train 53 and a release mechanism 54. here,
The skew means that the front end of the cut sheet K (one side of the cut sheet K preceding in the transport direction) is transported by the transport rollers (the first transport roller 21, the second transport roller 22, the third transport roller 23, and the fourth transport roller 23) of the printer 10. This refers to a phenomenon in which the sheet is supplied obliquely to the transport roller 24) and the platen 20.

As shown in FIG. 3, the lower drive roller 52 is rotatably and integrally fixed to a lower roller shaft 56 disposed orthogonally to the transport direction of the cut sheet K (arrows A and B). A plurality of these lower drive rollers 52 are arranged at a predetermined distance in the longitudinal direction of the lower roller shaft 56.

As shown in FIG. 5, a plurality of upper drive rollers 51 are provided at positions corresponding to the lower drive roller 52 on the upper roller shaft 55 provided in parallel with the lower roller shaft 56. . Each upper drive roller 51 is provided as shown in FIG.
As shown in FIG. 10, a roller unit 57, a clutch unit 58 as power transmission means, a coil spring 59, and a spring holder 60 are provided.

The roller portion 57 is provided on the upper roller shaft 5.
5 is fitted with play in the radial direction. Further, the roller portion 57 is disposed by being urged toward the lower drive roller 52 by a coil spring 59 via a spring holder 60, and is pressed by the lower drive roller 52. The coil spring 59 is interposed between the spring holder 60 and the upper cover 48 in a compressed state. The spring holder 60 comes into sliding contact with the roller portion 57 when the roller portion 57 rotates.

The clutch portion 58 is rotatably and integrally fitted to the upper roller shaft 55 by using a claw 61 and has a projection 62. The protrusion 62 is engaged with a concave portion 63 formed on the inner periphery of the roller portion 57. As a result of the engagement between the projections 62 and the recesses 63, the clutch portion 58 causes its axis P to be parallel or inclined to the axis O of the roller section 57 and the axis Q of the upper roller shaft 55, as shown in FIG. In this state, the rotational force of the clutch unit 58 can be transmitted to the roller unit 57.

The state in which the axis P of the clutch part 58 is inclined with respect to the axis O of the roller part 57 and the axis Q of the upper roller shaft 55 is caused by the condition that the roller part 57 of the upper drive roller 51 and the lower drive roller 52 are inclined. Is a case where a cut sheet K having a thickness t is pinched. Therefore, the degree to which the upper driving roller 51 separates from the lower driving roller 52 varies depending on the thickness t of the cut sheet K, and the inclination of the clutch portion 58 with respect to the axis O of the roller portion 57 and the axis Q of the upper roller shaft 55. Also varies.

The cut sheet K is carried in between the upper drive roller 51 and the lower drive roller 52. As shown in FIG. 3, the spring load of the coil spring 59 (FIG. 9) of the upper drive roller 51 causes the roller portion 57 to move. Acts on the cut sheet K through
The cut sheet K is securely held between the upper drive roller 51 and the lower drive roller 52. In this state, the cut sheet K is conveyed by the driving force of the upper drive roller 51 and the lower drive roller 52, and the leading ends of the cut sheet K abut the first and second conveyance rollers 21 and 22 (stopped state) of the printer 10. , The skew is corrected.

The sheet supply motor 50 is disposed below the sheet conveying surface 45. This sheet supply motor 50
As shown in FIG. 8, a motor pinion 64 is fixed to a motor shaft 77 of the motor. This motor pinion 64
Is always meshed with the main planetary gear 65, and the main planetary gear 65 can mesh with the first gear 67 of the gear train 53.

In the gear train 53, a first gear 67 and a second gear 68 are coaxially and integrally mounted to rotate.
The lower roller gear 70 always meshes with the lower roller gear 70, and the lower roller gear 70 and the upper roller gear 69 can mesh with each other. The lower roller gear 70 is rotatably fixed to one end of the lower roller shaft 56. The upper roller gear 69 is fixed to one end of the upper roller shaft 55 so as to rotate integrally therewith.

Therefore, the driving force of the sheet supply motor 50 is transmitted to the lower roller gear 70 via the motor pinion 64, the main planetary gear 65, the first gear 67 and the second gear 68, and to the upper roller gear 69 via the lower roller gear 70. Each is transmitted. As a result, the lower roller shaft 56 rotates to rotate the lower drive roller 52, and the upper roller shaft 55 rotates to rotate the upper drive roller 51. The cut sheet K on the sheet conveying surface 45 is conveyed while being nipped by the rotating upper drive roller 51 and lower drive roller 52, and the skew thereof is corrected.

The release mechanism 54 allows the upper drive roller 51 to be separated from the lower drive roller 52. As shown in FIGS. 7 and 8, a planetary lever 71 having an L-shape in a front view and a main planetary Gear 65 and sub planetary gear 66
And a release operation section 76 including a swing lever 73, a link lever 74, and an input gear 75.

The center part of the planetary lever 71 is fitted to the motor shaft 77 of the sheet supply motor 50, and the main planetary gear 65 and the sub-planetary gear 66 are rotatably supported at the respective ends. Further, the swing lever 73 is swingably supported by a pivot 78 of the upper cover 48, and an upper roller gear 69 is rotatably supported at a tip end thereof. A link lever 74 is pivotally supported at the base end of the swing lever 73 so as to be rotatable, and a lever pin 79 protrudes from the tip of the link lever 74. Further, a cam 80 that can be engaged with the lever pin 79 is formed integrally with the input gear 75.

Therefore, the power switching section 72 of the link lever 74 rotates the planetary lever 71 in the same direction when the sheet feed motor 50 is rotating forward (rotation in the direction of the arrow M in FIG. 8), so that the main planetary gear is rotated. The gear 65 is connected to the first gear 6 of the gear train 53.
7, the driving force of the sheet supply motor 50 is transmitted to the motor pinion 64, the main planetary gear 65, and the gear train 53.
(The first gear 67, the second gear 68, the lower roller gear 70, the upper roller gear 69) to rotate the upper drive roller 51 and the lower drive roller 52.

The power switching unit 7 of the release mechanism 54
When the sheet feed motor 50 rotates in the reverse direction (rotation in the direction of the arrow N in FIG. 7), the planetary lever 71 is rotated in the same direction to engage the sub planetary gear 66 with the input gear 75 of the release action portion 76. At the same time, the input gear 75 is rotated in the direction of arrow W by the rotational force of the sheet supply motor 50 via the motor pinion 64 and the sub planetary gear 66. The sheet supply motor 50 rotates reversely by an amount corresponding to the rotation of the input gear 75 by 180 °. Thereby, the cam 80 of the input gear 75 is also 1
It rotates by 80 °, engages with the lever pin 79 of the link lever 74, and rotates the swing lever 73 in the direction of the arrow X against the urging force of the coil spring 59. As a result, at the same time when the upper roller gear 69 separates from the lower roller gear 70, the upper drive roller 51 also separates from the lower drive roller 52, and the cut sheet K is placed between the upper drive roller 51 and the lower drive roller 52.
Alternatively, the continuous sheet can be easily and smoothly passed.

Further, the power switching unit 7 of the release mechanism 54
2, the sheet supply motor 50 is moved from the state in which the upper roller gear 69 and the lower roller gear 70 are separated from each other and the upper drive roller 51 and the lower drive roller 52 are separated from each other (FIG. 7).
When the rotation is reversed in the same direction,
Of the input gear 75 is further reversed by 180 °, the engagement between the cam 80 of the input gear 75 and the lever pin 79 of the link lever 74 is released, and the swing lever 73 is moved by the urging force of the coil spring 59 to the arrow Y (FIG. 8) Rotate in the direction. Thereby, the upper drive roller 51 comes into contact with the lower drive roller 52 at the same time as the upper roller gear 69 meshes with the lower roller gear 70.

Next, the operation of the thus configured sheet skew correction mechanism 46, particularly the operation of the release mechanism 54, will be described.

Normally, as shown in FIG.
9 and the lower roller gear 70 are separated from each other, and at the same time, the upper drive roller 51 and the lower drive roller 52 are also separated from each other.
As a result, the cut sheet K recorded by the printer 10 and the continuous sheet conveyed by the push tractor unit 12 of the printer 10 can easily pass between the upper drive roller 51 and the lower drive roller 52 of the sheet supply guide 43. And it can pass smoothly. When the upper drive roller 51 and the lower drive roller 52 are separated from each other and the upper roller gear 69 and the lower roller gear 70 are separated from each other, the sheet supply motor 50 is in a stopped state.

When the cut sheet K is manually inserted into the sheet supply guide 43 and the sheet detection sensor 47 detects the leading end of the cut sheet K, the sheet supply motor 50 rotates in the direction of arrow N from the state shown in FIG. The driving force of the sheet supply motor 50 is transmitted to the input gear 75 via the motor pinion 64 and the sub planetary gear 66. When the input gear 75 rotates in the direction of the arrow W by 180 °, the cam 80 of the input gear 75 also rotates by 180 °, and the engagement between the cam 80 and the lever pin 79 of the link lever 74 is released. As a result, as shown in FIG. 8, the swinging lever 73 rotates in the direction of the arrow Y by the urging force of the coil spring 59, and the upper roller gear 69 meshes with the lower roller gear 70, and at the same time, the upper drive roller 51 Touch 52.

Thereafter, the sheet supply motor 50 rotates forward in the direction of arrow M, the planetary lever 71 rotates in the same direction, and the main planetary gear 65 meshes with the first gear 67 of the gear train 53. Subsequently, when the sheet supply motor 50 rotates forward in the direction of arrow M, the driving force of the sheet supply motor 50 is transmitted to the lower roller gear 70 via the motor pinion 64, the main planetary gear 65, the first gear 67, and the second gear 68. The power is transmitted to the upper roller gear 69. Thereby, the upper drive roller 51 and the lower drive roller 52 are rotationally driven,
Cut sheet K manually inserted on sheet conveying surface 45
And the first transport roller 21 and the second transport roller 21 of the printer 10.
The skew of the cut sheet K is corrected by abutting against the transport roller 22 (stopped state).

After this skew correction, as shown in FIG. 7, the sheet supply motor 50 rotates in the direction of arrow N, rotates the planetary lever 71 in the same direction, and engages the sub planetary gear 66 with the input gear 75. , The input gear 75 is shifted by 180 ° arrow W.
Rotate in the direction. Thereby, the cam 8 of the input gear 75
0 also rotates 180 ° and the lever pin 7 of the link lever 74
9, the swing lever 73 rotates in the arrow X direction against the urging force of the coil spring 59. For this reason, the upper roller gear 69 separates from the lower roller gear 70, and the upper drive roller 5
1 is separated from the lower drive roller 52, and the sheet can easily pass between the upper drive roller 51 and the lower drive roller 52 as described above.

With the configuration described above, the following effects are obtained according to the above embodiment.

Since the sheet skew correction mechanism 46 includes a pair of upper drive rollers 51 and a lower drive roller 52, even if the cut sheet K is copy paper, a pair of upper drive rollers 51 and lower drive rollers 52 are provided on both sides of the copy paper. Drive roller 51 and lower drive roller 52
Act on the conveying force. For this reason, the conveyance force acts only on one side of the copy paper, and it is possible to prevent a sheet jam (paper jam) resulting from the conveyance of only the one side of the copy paper.

Since the upper drive roller 51 has the roller portion 57 urged toward the lower drive roller 52 by the urging force of the coil spring 59, the roller portion 57 of the upper drive roller 51 acts on the cut sheet K. Load is stabilized and set with high accuracy. As a result, the skew correction of the cut sheet K by the pair of the upper drive roller 51 and the lower drive roller 52 can be reliably performed.

In the skew correcting mechanism of the first prior art, the plurality of projections provided on the shaft are not always in contact with the skew of the sheet due to its structure. It takes some time to correct. On the other hand, in the sheet skew correction mechanism 46 of the present embodiment, the pair of the upper drive roller 51 and the lower drive roller 52 are in constant contact during the skew correction of the cut sheet K. As a result, the skew correction of the cut sheet K can be completed in a short time.

The sheet skew correction mechanism 46 includes a pair of an upper drive roller 51 and a lower drive roller 52.
Since the upper drive roller 51 is provided with a release mechanism 54 capable of separating from the lower drive roller 52, the release mechanism 54 is provided after the skew correction of the cut sheet K is completed.
Is operated to separate the upper drive roller 51 from the lower drive roller 52. As a result, the cut sheet K on which recording has been performed by the recording head 18 of the printer 10 and the continuous sheet conveyed by the push tractor unit 12 of the printer 10 can be easily and smoothly conveyed in the sheet supply guide 43.

The release mechanism 54 of the sheet skew correction mechanism 46 is a single sheet supply motor 5 that applies a driving force to the pair of upper drive roller 51 and lower drive roller 52.
It is configured to operate by reversing the rotation direction of 0. Therefore, even if the release mechanism 54 is provided in the sheet skew correction mechanism 46, it is not necessary to separately provide a power drive source for the sheet skew correction mechanism 46, so that the cost can be reduced.

Although the present invention has been described based on the above embodiment, the present invention is not limited to this.

For example, in the above embodiment, the upper drive roller 51 is configured to be biased by the coil spring 59 so as to be able to contact and separate from the lower drive roller 52.
When the lower drive roller 52 is biased by a spring, the upper drive roller 51
The upper drive roller 51 and the lower drive roller 52 are both biased by a spring.
You may be comprised so that mutual contact and separation are possible.

[0068]

According to the sheet supply guide of the recording apparatus according to the first aspect of the invention, the skew correction of the sheet can be surely performed without causing a problem such as a sheet jam.

According to the recording apparatus of the third aspect of the invention, the provided sheet supply guide can surely correct the skew of the sheet without causing a problem such as a sheet jam.

[Brief description of the drawings]

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.

FIG. 2 is a perspective view showing a printer main body of the printer shown in FIG.

FIG. 3 is a side view of the printer main body of FIG. 2;

FIG. 4 is a perspective view showing the sheet supply guide of FIG. 1;

FIG. 5 is an exploded perspective view of the sheet supply guide of FIG.

FIG. 6 is a perspective view of the sheet supply guide of FIG. 4 viewed from an angle different from that of FIG. 5;

FIG. 7 is a side sectional view showing the sheet supply guide of FIG. 4;

FIG. 8 is a cross-sectional view corresponding to FIG. 7, showing a state in which a sheet skew correction function is exhibited.

FIG. 9 is a sectional view taken along line IX-IX in FIG. 3;

FIG. 10 is a perspective view showing an upper drive roller and a lower drive roller of FIG. 3;

FIG. 11 is a front view showing a state of joining the upper drive roller and the lower drive roller in FIG. 3;

[Explanation of symbols]

 Reference Signs List 10 printer (recording device) 11 printer body (recording device body) 18 recording head 20 platen 43 sheet supply guide 46 sheet skew correction mechanism 48 upper cover 50 sheet supply motor 51 upper drive roller 52 lower drive roller 53 gear train 54 release Mechanism section 55 Upper roller shaft 57 Roller section of upper drive roller 58 Clutch section of upper drive roller 59 Coil spring 60 Spring holder 61 Claw of clutch section 62 Projection section of clutch section 63 Depressed section of roller section 65 Main planetary gear 69 Upper roller gear 70 Lower roller gear 72 Power switching section 76 Release action section K Cut sheet

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F049 AA01 CA21 DA11 DA12 LA02 LA05 LA07 LB03 3F063 BA02 BA06 BA08 BA10 BC04 CA02 CA06 3F102 AA11 AB01 BA02 BB02 DA08 EC01 EC02 EC03 EC07 FA02

Claims (4)

[Claims] A sheet is supplied to a recording device,
In a sheet feeding guide of a recording apparatus having a sheet skew correction mechanism for correcting skew of a sheet, the sheet skew correction mechanism includes a pair of drive rollers, and one of the drive rollers has a shaft in a radial direction. A roller portion fitted with play and urged to the other drive roller side by a coil spring, and a power transmission means engaged with the roller portion and provided integrally with the shaft for rotation; A sheet supply guide for a recording apparatus, comprising: 2. The sheet supply guide according to claim 1, wherein the coil spring is disposed between a spring holder and a cover that can slide on the roller. 3. The recording head records an image on a sheet supplied from a sheet supply guide and conveyed between the recording head and the platen while the recording head runs along the platen. In a recording apparatus having a sheet skew correction mechanism for correcting a line, the sheet skew correction mechanism of the sheet supply guide includes a pair of drive rollers, and one of the drive rollers has a radial play on a shaft. And a power transmission means engaged with the roller and provided integrally with the shaft so as to rotate integrally with the roller. A recording apparatus characterized by comprising: 4. The recording apparatus according to claim 3, wherein the coil spring in the sheet supply guide is disposed between a spring holder slidably in contact with a roller and a cover.