JP4674414B2 - Sheet supply guide for recording apparatus and recording apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet supply guide for a recording apparatus that supplies a sheet into a recording apparatus main body of the recording apparatus, and a recording apparatus including the sheet supply guide.
[0002]
[Prior art]
In the recording apparatus, while the carriage on which the recording head is mounted travels along the platen, the recording head supplies characters or the like to the sheet supplied from the sheet supply guide and conveyed between the recording head and the platen. A dot impact printer that records an image including the image is known.
[0003]
The sheet supply guide supplies a cut sheet into the printer main body of the printer, but has a sheet skew correction mechanism that corrects the skew of the manually inserted cut sheet. As a sheet supply guide having such a sheet skew correction mechanism, a first conventional technique described in Japanese Patent No. 2935262 and a second conventional technique described in US Pat. No. 5,947,471 are known.
[0004]
The sheet skew correction mechanism of the sheet supply guide in the first prior art is one in which a plurality of protrusions are integrally provided on a shaft disposed above the sheet conveying surface. When a cut sheet is loaded onto the sheet conveying surface, the shaft rotates and a plurality of protrusions rotate. The rotating protrusions come into contact with one side of the sheet and convey the cut sheet to the printer body side. The skew of the cut sheet is corrected by abutting the leading edge of the sheet with the conveying roller (stopped state) of the printer main body.
[0005]
In addition, the sheet skew correction mechanism of the sheet supply guide in the second prior art holds the cut sheet skewed by a pair of upper and lower drive rollers, and abuts the front end of the cut sheet against the shutter, thereby The skew is corrected. Further, in the second prior art, one of the pair of drive rollers is provided so as to be able to bend and deform in the radial direction, and the restoring force of the deformation is a load acting on the sheet, A cut sheet is sandwiched between the drive rollers.
[0006]
[Problems to be solved by the invention]
In the first conventional technique, after the skew correction of the cut sheet, the shaft is rotated by a predetermined angle so that the plurality of protrusions are separated from the sheet conveying surface. Thus, a cut sheet recorded by the printer and placed on the sheet conveyance surface of the sheet supply guide, or a continuous sheet carried into the printer by the printer tractor unit and placed on the sheet conveyance surface of the sheet supply guide, Easily passes through the supply guide and is discharged.
[0007]
However, in the sheet skew correction mechanism of the second prior art, the pair of drive rollers for correcting sheet skew is not configured to be separated after the skew correction. For this reason, the recorded cut sheet or continuous sheet as described above cannot easily pass through the sheet supply guide, and sheet discharge is delayed.
[0008]
An object of the present invention is made in consideration of the above-described circumstances, and a sheet supply guide that can smoothly carry a sheet after correcting the skew of the sheet, and a recording apparatus including the sheet supply guide. It is to provide.
[0009]
[Means for Solving the Problems]
According to the first aspect of the present invention, in the sheet supply guide of the recording apparatus that supplies the sheet to the recording apparatus and includes the sheet skew correction mechanism that corrects the skew of the sheet, the sheet skew correction mechanism includes a pair of sheet skew correction mechanisms. It is characterized by comprising a drive roller, and further provided with a release mechanism that allows the one drive roller to be separated from the other drive roller.
[0010]
According to a second aspect of the present invention, in the first aspect of the invention, the release mechanism reverses the rotation direction of a single motor that applies a driving force to a pair of driving rollers via a gear train. Thus, it is configured to be operable.
[0011]
According to a third aspect of the present invention, an image is recorded on a sheet supplied from a sheet supply guide and conveyed between the platen while the recording head runs along the platen. In the recording apparatus having the sheet skew correction mechanism for correcting the sheet skew, the sheet skew correction mechanism of the sheet supply guide includes a pair of drive rollers, and further, these one drive roller is connected to the other. A release mechanism that can be separated from the drive roller is provided.
[0012]
According to a fourth aspect of the present invention, in the third aspect of the present invention, the release mechanism portion in the sheet supply guide rotates a single motor that applies a driving force to the pair of driving rollers via a gear train. It is characterized by being configured to operate by reversing the direction.
[0013]
The inventions according to claims 1 to 4 have the following effects.
[0014]
After the sheet skew correction is completed, the sheet skew correction mechanism is provided with a pair of drive rollers, and further includes a release mechanism that enables the one drive roller to be separated from the other drive roller. Operates the release mechanism to separate one drive roller from the other drive roller. Thereby, the cut sheet recorded by the recording apparatus and the continuous sheet conveyed by the tractor of the recording apparatus can be conveyed (discharged) easily and smoothly in the sheet supply guide.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0016]
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 of FIG. FIG. 3 is a side sectional view of the printer main body of FIG.
[0017]
The printer 10 as a recording apparatus shown in these drawings records an image including characters by hitting a number of recording wires of a recording head against a sheet via an ink ribbon (both not shown) to record dots. Dot impact printer.
[0018]
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 13 A and a lower case 13 B that cover the upper and lower sides of the printer main body 11, and the printer main body 11. And a sheet supply guide 43 that is installed on the front side and supplies the cut sheet K into the printer main body 11.
[0019]
The printer main body 12 is housed in an upper case 13A and a lower case 13B that are joined to each other. An operation panel 44 is installed in the upper case 13A. Further, a sheet supply guide 43 is detachably mounted on the front side of the printer main body 12 and a push tractor unit 12 is detachably mounted on the rear side.
[0020]
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 a single sheet, a single sheet copy paper, a cut film, and the like, and examples of the continuous sheet include a continuous sheet, a continuous copy sheet, and the like.
[0021]
As shown in FIG. 3, the printer main body 11 includes a base frame 14 as a main body frame, a main frame 15, a left side frame 16 and a right side frame 17, a recording head 18 and a carriage 19 as recording mechanisms, and a sheet. A platen 20 as a conveyance mechanism, a sheet guide 25, a first conveyance roller 21, a second conveyance roller 22, a third conveyance roller 23, and a fourth conveyance roller 24 are configured.
[0022]
As shown in FIG. 2, a left side frame 16 and a right side frame 17 are erected and fixed to substantially both ends of the base frame 14 and the main frame 15. A lower carriage shaft 26 and an upper carriage shaft 27 (FIG. 3) are bridged between the left side frame 16 and the right side frame 17 at a predetermined distance in the vertical direction.
Of these, the lower carriage shaft 26 is pivotally supported by the left side frame 16 and the right side frame 17. Further, a platen 20 is bridged between the left side frame 16 and the right side frame 17 and is rotatably disposed, and a seat guide 25 is fixedly disposed.
[0023]
The push tractor unit 12 shown in FIG. 3 supplies a continuous sheet (for example, continuous paper) to the sheet conveyance mechanism unit including the platen 20 and has a pair of left and right tractors 28. These tractors 28 are rotatably integrated with a tractor drive shaft 29 and supported by a tractor drive pulley (not shown) that is axially slidable, and a tractor guide shaft (not shown) that is rotatable and slidable in the axial direction. A tractor belt 31 is wound around a tractor driven pulley (not shown) pivotally supported on the tractor, and a sheet pressing lid 32 is provided.
[0024]
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. A plurality of pins 33 projecting from the entire outer periphery of the tractor belt 31 can be engaged with holes (not shown) drilled on both sides in the width direction of the continuous sheet.
[0025]
In the sheet transport mechanism including the platen 20, the first transport roller 21 and the second transport roller 22 are located on the front side of the printer main body 11, and the third transport roller 23 and the fourth transport roller 24 are connected to the printer main body. 11 is arranged on the rear side of each. Further, the first conveyance roller 21 and the second conveyance roller 22, and the third conveyance roller 23 and the fourth conveyance roller 24 are arranged in the vertical direction to make a pair.
[0026]
Among these, the first conveyance roller 21 and the third conveyance roller 23 are arranged below the sheet guide 25 together with the platen 20, and the second conveyance roller 22 and the fourth conveyance roller 24 are arranged above the sheet guide 25. The upper portions of the platen 20, the first conveyance roller 21, and the third conveyance roller 23 are in a state of protruding above the sheet guide 25. Further, a sheet holding plate 37 that holds a sheet with the sheet guide 25 is provided on the front side of the printer body 11 in the sheet guide 25.
[0027]
The platen 20, first transport roller 21, second transport roller 22, third transport roller 23, and fourth transport roller 24 are driven clockwise (CW) in FIG. 3 or counterclockwise by the drive wheel train 34 (FIG. 2). It is rotationally driven in the direction (CCW). Similarly, the tractor belt 31 of the push tractor unit 12 is driven counterclockwise by the drive wheel train 34.
[0028]
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, the right side frame 17. The drive wheel train 34 includes a motor pinion 36 that is rotatably and integrally fixed to a drive shaft of a sheet conveying motor 35 that can rotate forward or reverse. The driving force from the motor pinion 36 is wound around a platen 20, a first conveying roller 21, a second conveying roller 22, a third conveying roller 23, a fourth conveying roller 24, and a push tractor unit via a winding transmission mechanism and a gear mechanism. 12 can be transmitted.
[0029]
A cut sheet K such as a single sheet of paper or a cut sheet of copy paper is manually supplied from the front side of the printer main body 11 through the sheet supply guide 43, and thereafter, as shown in FIG. Due to the clockwise rotation of the conveying roller 21 and the third conveying roller 23 and the counterclockwise rotation of the second conveying roller 22 and the fourth conveying roller 24, the printer body 11 is conveyed in the direction of arrow A from the front to the rear. Further, the platen 20, the first transport roller 21 and the third transport roller 23 are rotated counterclockwise, and the second transport roller 22 and the fourth transport roller 24 are rotated clockwise from the rear of the printer main body 11. It is conveyed in the direction of arrow B toward the front.
[0030]
On the other hand, a continuous sheet such as continuous paper is supplied in the direction of arrow B from the rear side of the printer main body 11 by the push tractor unit 12, and then the platen 20, the first transport roller 21, the second transport roller 22, and the third transport roller. 23 and the fourth conveying roller 24 are conveyed in the same direction (arrow B direction).
[0031]
As a result, the cut sheet K and the continuous sheet are conveyed in the sub-scanning direction orthogonal to the later-described main scanning direction of the carriage 19.
[0032]
As shown in FIG. 2, the carriage 19 is slidably inserted into the lower carriage shaft 26 and the upper carriage shaft 27 (FIG. 3) and has the recording head 18 mounted thereon. Since the lower carriage shaft 26 and the upper carriage shaft 27 are arranged in parallel with the platen 20, the carriage 19 travels in the main scanning direction that coincides with the axial directions of the platen 20, the lower carriage shaft 26 and the upper carriage shaft 27 ( Scanning) is possible.
[0033]
The carriage 19 is coupled to a timing belt 39 (FIG. 3) that is reciprocated by forward rotation or reverse rotation of a carriage drive motor 38. Accordingly, the carriage 19 is guided to the lower carriage shaft 26 and the upper carriage shaft 27 via the timing belt 39 by the forward or reverse rotation of the carriage drive motor 38, and is scanned leftward or rightward in FIG. 2 in the main scanning direction. The Here, the carriage drive motor 38 is configured by a stepping motor, for example, together with the sheet conveyance motor 35.
[0034]
As shown in FIGS. 2 and 3, the carriage 19 is provided with a cartridge holder 40, and a ribbon cartridge (not shown) containing an ink ribbon is attached to the cartridge holder 40. Further, the carriage 19 is provided with a ribbon mask holder 41 that protects the ink ribbon in the ribbon cartridge from a sheet (cut sheet K or continuous sheet) conveyed in contact with the upper peripheral surface of the platen 21. The ink ribbon in the ribbon cartridge is provided so as to be movable in front of the recording wire of the recording head 18 by a ribbon take-up shaft 42 installed in the cartridge holder 40.
[0035]
The recording head 18 includes a large number of recording wires (not shown), and the ink ribbon is positioned in front of the protruding direction of these recording wires as described above. While the recording head 18 is scanned in the main scanning direction together with the carriage 19, the recording wire protrudes and strikes the ink ribbon, and the ink of the ink ribbon is conveyed between the platen 20 and the recording head 18. It is attached to a sheet (cut sheet K or continuous sheet), and an image including characters is recorded on this sheet.
[0036]
In the recording operation by the recording head 18, one line sentence 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 the sheet is recorded each time the one line sentence is recorded. Is a cut sheet K, the sheet transport mechanism (platen 20, first transport roller 21, second transport roller 22, third transport roller 23, and fourth transport roller 24), and the sheet is a continuous sheet In this case, the sheet conveying mechanism and the push tractor unit 12 convey the sheet by a predetermined length (for an interval between normal rows) and repeat these operations.
[0037]
By the way, as described above, the sheet supply guide 43 for supplying the cut sheet K into the sheet conveying mechanism section of the printer main body 11 includes the sheet conveying surface 45, the sheet skew correcting mechanism 46, as shown in FIGS. A sheet detection sensor 47 (FIG. 6), an upper cover 48, and a lower cover 49 are provided. The cut sheet K is conveyed on the sheet conveyance surface 45. Further, the lower cover 49 covers all of the lower side of the sheet conveying surface 45, and the upper cover 48 covers a part of the upper side of the sheet conveying surface 45 (above an upper drive roller 51 and a swing lever 73 described later).
[0038]
The sheet detection sensor 47 is installed in the vicinity of the downstream side of the upper drive roller 51 and the lower drive roller 52, which will be described later, above the sheet conveying surface 45, and detects that the leading edge of the cut sheet K has reached this position. Type optical sensor.
[0039]
The sheet skew correction mechanism 46 corrects skew of the cut sheet K manually inserted on the sheet conveying surface 45, and includes a pair of an upper drive roller 51 and a lower drive roller 52, a sheet supply motor 50, a gear. A train wheel 53 and a release mechanism 54 are included. Here, the skew means that the leading edge of the cut sheet K (one side of the cut sheet K preceding in the conveyance direction) is a conveyance roller of the printer 10 (first conveyance roller 21, second conveyance roller 22, third conveyance roller 23). , The fourth feeding roller 24) and the platen 20 are supplied at an angle.
[0040]
As shown in FIG. 3, the lower drive roller 52 is integrally fixed to a lower roller shaft 56 that is disposed perpendicular to the conveyance direction (arrows A and B) of the cut sheet K. A plurality of these lower drive rollers 52 are arranged at a predetermined distance in the longitudinal direction of the lower roller shaft 56.
[0041]
Further, as shown in FIG. 5, a plurality of upper drive rollers 51 are disposed at positions corresponding to the lower drive roller 52 in an upper roller shaft 55 disposed in parallel with the lower roller shaft 56. As shown in FIGS. 9 and 10, each upper drive roller 51 includes a roller portion 57, a clutch portion 58 as power transmission means, a coil spring 59, and a spring holder 60.
[0042]
The roller portion 57 is fitted to the upper roller shaft 55 with play in the radial direction. Further, the roller portion 57 is disposed by being biased toward the lower drive roller 52 by the coil spring 59 via the spring holder 60 and is pressed against 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 is in sliding contact with the roller portion 57 when the roller portion 57 rotates.
[0043]
Further, the clutch portion 58 is rotatably fitted integrally with the upper roller shaft 55 using the claw 61 and includes a projection portion 62. This protrusion 62 is engaged with a recessed portion 63 formed on the inner periphery of the roller portion 57. As a result of the engagement between the protrusion 62 and the recess 63, the clutch 58 has its axis P parallel or inclined with the axis O of the roller 57 and the axis Q of the upper roller shaft 55, as shown in FIG. In this state, the rotational force of the clutch portion 58 can be transmitted to the roller portion 57.
[0044]
The state in which the shaft P of the clutch portion 58 is inclined with respect to the axis O of the roller portion 57 and the axis Q of the upper roller shaft 55 is a thickness between the roller portion 57 of the upper drive roller 51 and the lower drive roller 52. This is a case where t cut sheet K is sandwiched. Therefore, the degree to which the upper drive roller 51 is separated from the lower drive 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. The degree of changes also.
[0045]
The cut sheet K is carried between the upper drive roller 51 and the lower drive roller 52, and the spring load of the coil spring 59 (FIG. 9) of the upper drive roller 51 is passed through the roller portion 57 as shown in FIG. Acting on the cut sheet K, the cut sheet K is securely sandwiched 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 driving roller 51 and the lower driving roller 52, and the leading end is abutted against the first conveying roller 21 and the second conveying roller 22 (stopped state) of the printer 10. , Skew is corrected.
[0046]
The sheet supply motor 50 is disposed below the sheet conveyance surface 45. As shown in FIG. 8, the sheet supply motor 50 has a motor pinion 64 fixed to the motor shaft 77. The motor pinion 64 always meshes with the main planetary gear 65, and the main planetary gear 65 can mesh with the first gear 67 of the gear train 53.
[0047]
In the gear train 53, the first gear 67 and the second gear 68 are coaxially and integrally installed, the second gear 68 and the lower roller gear 70 are always meshed, and the lower roller gear 70 and the upper roller gear 69 are meshed. It is configured to be possible. 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 together.
[0048]
Accordingly, 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. The As a result, the lower roller shaft 56 rotates and the lower drive roller 52 rotates, and the upper roller shaft 55 rotates and the upper drive roller 51 rotates. The cut sheet K on the sheet conveyance surface 45 is nipped and conveyed by the rotating upper drive roller 51 and lower drive roller 52, and the skew is corrected.
[0049]
The release mechanism unit 54 allows the upper drive roller 51 to be separated from the lower drive roller 52. As shown in FIGS. 7 and 8, the L-shaped planetary lever 71, the main planetary gear 65, and A power switching unit 72 including a sub planetary gear 66 and a release action unit 76 including a swing lever 73, a link lever 74, and an input gear 75 are configured.
[0050]
The central portion 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 leading ends. Further, the swing lever 73 is pivotally supported by a pivot shaft 78 of the upper cover 48, and an upper roller gear 69 is rotatably supported at the tip. A link lever 74 is pivotally supported at the base end of the swing lever 73, and a lever pin 79 projects from the tip of the link lever 74. Further, the input gear 75 is integrally formed with a cam 80 that can be engaged with the lever pin 79.
[0051]
Therefore, the power switching unit 72 of the link lever 74 rotates the planetary lever 71 in the same direction when the sheet supply motor 50 rotates forward (rotation in the direction of arrow M in FIG. The driving force of the sheet supply motor 50 is engaged with the first gear 67 of the gear wheel train 53, the motor pinion 64, the main planetary gear 65 and the gear wheel train 53 (first gear 67, second gear 68, lower roller gear 70, upper The upper drive roller 51 and the lower drive roller 52 are rotated and transmitted to the roller gear 69).
[0052]
Further, the power switching unit 72 of the release mechanism unit 54 rotates the planetary lever 71 in the same direction when the sheet supply motor 50 is rotated in the reverse direction (when rotating in the direction of arrow N in FIG. 7), and the sub planetary gear 66 is moved. The input gear 75 meshes with the input gear 75 of the release action unit 76, and the input gear 75 is rotated in the arrow W direction 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 reverses by the amount that the input gear 75 rotates 180 °. As a result, the cam 80 of the input gear 75 also rotates 180 °, 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 biasing force of the coil spring 59. As a result, at the same time as the upper roller gear 69 is separated from the lower roller gear 70, the upper drive roller 51 is also separated from the lower drive roller 52, and a cut sheet K or a continuous sheet is formed between the upper drive roller 51 and the lower drive roller 52. It can be passed easily and smoothly.
[0053]
Further, the power switching unit 72 of the release mechanism unit 54 is configured so that 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). Similarly, when 50 is reversed in the direction of arrow N, the input gear 75 of the release action portion 76 is further reversed 180 °, and the engagement between the cam 80 of the input gear 75 and the lever pin 79 of the link lever 74 is released. Thus, the swing lever 73 is rotated in the direction of arrow Y (FIG. 8) by the biasing force of the coil spring 59. As a result, the upper roller gear 69 meshes with the lower roller gear 70, and at the same time, the upper drive roller 51 contacts the lower drive roller 52.
[0054]
Next, the operation of the sheet skew correction mechanism 46 configured as described above, particularly the release mechanism 54 will be described.
[0055]
Normally, as shown in FIG. 7, the upper roller gear 69 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. Accordingly, 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 be easily passed between the upper drive roller 51 and the lower drive roller 52 of the sheet supply guide 43. And it can pass smoothly. Thus, 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.
[0056]
When the cut sheet K is manually inserted into the sheet supply guide 43 and the sheet detection sensor 47 detects the leading edge of the cut sheet K, the sheet supply motor 50 reverses in the direction of arrow N from the state of FIG. The driving force of the 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 180 ° arrow W direction, the cam 80 of the input gear 75 also rotates 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 swing lever 73 is rotated in the arrow Y direction by the biasing 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 is moved to the lower drive roller. 52 is contacted.
[0057]
Thereafter, the sheet supply motor 50 rotates forward in the arrow M direction, 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 the arrow M, the driving force of the sheet supply motor 50 passes through the motor pinion 64, the main planetary gear 65, the first gear 67, and the second gear 68 to the lower roller gear 70. Is transmitted to the upper roller gear 69. As a result, the upper drive roller 51 and the lower drive roller 52 are rotationally driven to convey the cut sheet K that has been manually inserted onto the sheet conveyance surface 45, and the first conveyance roller 21 and the second conveyance roller 22 ( The skew of the cut sheet K is corrected against the stop state.
[0058]
After this skew correction, as shown in FIG. 7, the sheet supply motor 50 reverses in the direction of the arrow N, rotates the planetary lever 71 in the same direction, and meshes the sub planetary gear 66 with the input gear 75. The gear 75 is rotated in the direction of arrow W by 180 °. As a result, the cam 80 of the input gear 75 also rotates 180 ° and engages with the lever pin 79 of the link lever 74, and the swing lever 73 rotates in the direction of arrow X against the urging force of the coil spring 59. Therefore, the upper roller gear 69 is separated from the lower roller gear 70, and the upper drive roller 51 is separated from the lower drive roller 52, so that the sheet easily passes between the upper drive roller 51 and the lower drive roller 52 as described above. It is possible.
[0059]
With the configuration as described above, the following effects (1) to (5) are achieved according to the above embodiment.
[0060]
(1) 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 are provided on both sides of the copy paper. The driving roller 51 and the lower driving roller 52 act on the conveying force. For this reason, it is possible to prevent the occurrence of sheet jamming (paper jam) that occurs as a result of the conveyance force acting only on one side of the copy paper and the conveyance of only the single-sided paper.
[0061]
(2) 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.
[0062]
(3) In the sheet skew correction mechanism of the first prior art, the plurality of protrusions provided on the shaft are not always in contact with each other during the sheet skew correction because of the structure. A certain amount of time is required for correction. In contrast, 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 always in 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.
[0063]
(4) The sheet skew correction mechanism 46 includes a pair of upper drive roller 51 and lower drive roller 52, and further includes a release mechanism portion 54 that allows the upper drive roller 51 to be separated from the lower drive roller 52. Therefore, after the skew correction of the cut sheet K is finished, the release mechanism unit 54 is operated to move the upper drive roller 51 away from the lower drive roller 52. Accordingly, the cut sheet K recorded 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.
[0064]
(5) The release mechanism 54 in the sheet skew correction mechanism 46 operates by reversing the rotation direction of a single sheet supply motor 50 that applies driving force to the pair of upper drive roller 51 and lower drive roller 52. Configured to get. For this reason, even if the release mechanism portion 54 is present 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.
[0065]
As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this.
[0066]
For example, in the above-described embodiment, the upper drive roller 51 is spring-biased by the coil spring 59 and configured to be able to contact and separate from the lower drive roller 52. However, the lower drive roller 52 is spring-biased. Thus, the upper drive roller 51 may be configured to be able to contact or separate, or both the upper drive roller 51 and the lower drive roller 52 may be spring-biased and configured to be able to contact and separate from each other.
[0067]
【The invention's effect】
According to the sheet supply guide of the recording apparatus according to the first aspect of the invention, the sheet can be smoothly conveyed after the skew correction of the sheet.
[0068]
According to the recording apparatus of the third aspect of the present invention, the sheet can be smoothly conveyed after the skew correction of the sheet by the equipped sheet supply guide.
[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 invention is applied.
2 is a perspective view showing a printer main body of the printer of FIG. 1. FIG.
FIG. 3 is a side view of the printer main body of FIG. 2;
4 is a perspective view showing a sheet supply guide of FIG. 1. FIG.
FIG. 5 is an exploded perspective view of the sheet supply guide of FIG.
6 is a perspective view of the sheet supply guide of FIG. 4 viewed from an angle different from that of FIG.
7 is a side sectional view showing the sheet supply guide of FIG.
FIG. 8 is a cross-sectional view corresponding to FIG. 7, showing a state in which the sheet skew correction function is exhibited.
9 is a cross-sectional view taken along line IX-IX in FIG.
10 is a perspective view showing an upper drive roller and a lower drive roller in FIG. 3. FIG.
11 is a front view showing a joining state of the upper drive roller and the lower drive roller in FIG. 3. FIG.
[Explanation of symbols]
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 Upper drive roller roller section 58 Upper drive roller clutch portion 59 Coil spring 60 Spring holder 61 Clutch portion claw 62 Clutch portion protrusion 63 Roller portion recess 65 Main planetary gear 69 Upper roller gear 70 Lower roller gear 72 Power switching portion 76 Release action portion K Cut sheet

Claims (5)

In a sheet supply guide of a recording apparatus having a sheet skew feeding correction mechanism that supplies a sheet to a recording apparatus including a recording head and a sheet conveying mechanism unit that conveys the sheet to the recording head and corrects the skew of the sheet ,
The sheet skew correction mechanism includes a pair of driving rollers, and further includes a release mechanism that enables the one driving roller to be separated from the other driving roller .
The manually inserted sheet is conveyed by the sheet skew correction mechanism to correct skew, and after skew correction, one drive roller is separated from the other drive roller by the release mechanism, and the corrected A sheet supply guide for a recording apparatus, wherein the sheet can be conveyed by the sheet conveying mechanism of the recording apparatus.   2. The release mechanism according to claim 1, wherein the release mechanism is configured to operate by reversing the rotation direction of a single motor that applies a driving force to a pair of driving rollers via a gear train. A sheet supply guide for the recording apparatus. While the recording head runs along the platen, an image is recorded on the sheet supplied from the sheet supply guide and conveyed between the platen, and the sheet supply guide corrects the skew of the sheet. In a recording apparatus having a skew correction mechanism,
A sheet conveying mechanism that conveys the sheet corrected by the sheet supply guide to the recording head;
The sheet skew correction mechanism of the sheet supply guide includes a pair of drive rollers, and further includes a release mechanism that enables the one drive roller to be separated from the other drive roller .
The sheet supply guide corrects the skew feeding by feeding the manually inserted sheet by the sheet skew feeding correction mechanism, and after the skew feeding correction, the release mechanism portion separates one driving roller from the other driving roller. And the corrected sheet can be conveyed by the sheet conveying mechanism . The recording apparatus according to claim 3, wherein the sheet conveyance mechanism unit conveys the sheet after recording by the recording head into the sheet supply guide . A push tractor unit that supplies a continuous sheet to the sheet conveying mechanism from the rear of the main body of the recording apparatus;
The said sheet conveyance mechanism part makes one drive roller separate from the other drive roller by the said release mechanism part, when the said continuous sheet is conveyed by the said push tractor unit, The Claim 3 or 4 characterized by the above-mentioned. Recording device.

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