JP4817896B2 - Image forming apparatus and image forming method - Google Patents

Description

  The present invention relates to an image forming apparatus or an image forming method for printing on a recording material such as recording paper based on image information.

The simplest printer apparatus includes two units, a paper storage unit for storing recording paper and an image forming unit.
A plan view, a side view, and a perspective view of this general form are shown in FIGS.

FIG. 13 shows an example of a configuration in which the paper storage unit 11 (the dotted line area is the maximum size recording paper on which image formation is possible) and the leading end is connected to the image formation unit 12, and the recording paper is fed in the direction of the arrow. -Conveyance, image formation, and ejection.
Although the installation area: S increases, the height dimension: H decreases.
Such an apparatus is described in Patent Document 1, for example.

FIG. 14 shows an example of a configuration in which the paper storage unit 21 (the dotted line area is the maximum size recording paper on which image formation is possible) and the leading end is connected to the image formation unit 22, and the recording paper is fed in the direction of the arrow. -Conveyance, image formation, and ejection.
Compared to the example of FIG. 13, the height direction: H increases, but the installation area: S can be reduced.
Such an apparatus is described in Patent Document 2, for example.

FIG. 15 shows an example of a configuration in which the paper storage unit 31 (the dotted line area is the maximum size recording paper on which image formation is possible) is horizontal and the image forming unit 32 is arranged thereon. The recording paper is fed in the direction of the arrow. -Conveyance, image formation, and ejection.
Compared with the example of FIG. 13, the height direction: H is larger, and the installation area: S is larger than that of the example of FIG. 14, but the height direction: H and the installation area: S are well balanced. .
Such an apparatus is disclosed in Patent Document 3, for example.

  The first feature common to the three conventional configurations is that image formation is performed by passing the maximum size recording paper that can be imaged by the printer device through the image forming unit with the longitudinal direction as the transport direction. .

  Currently, various recording systems such as an electrophotographic system, an ink jet system, and a thermal recording system are employed in an image forming unit, and a printer apparatus is put into practical use. In all of these recording methods, side plate members serving as structures are provided on both sides in the recording sheet conveyance direction of the conveyance path through which the recording sheet of the image forming unit passes.

  Since both sides of the paper feed roller and both ends of the component parts related to image formation are supported on the side plate members on both sides, the smaller the distance between the side plate members, the shorter the total length of the paper feed roller and the component parts related to image formation. It becomes possible to do.

  It is advantageous that the overall length of the component parts is shorter in terms of mechanical characteristics such as accuracy, processing time, material cost, processing cost, and position accuracy during assembly, deflection rigidity, and ease of assembly. Is clear.

  It is also natural that the interval between the left and right side plate members must be larger than at least the width dimension of the recording paper that passes therethrough in order to pass the recording paper therebetween.

  For this reason, most printers are configured to convey recording paper with the conveyance direction of the recording paper in the longitudinal direction and the width direction of the conveyance path in the short direction of the recording paper.

  Conversely, when the recording paper is transported with the recording paper transport direction being the short direction and the width direction of the transport path being the longitudinal direction of the recording paper, if the recording speed per unit length is the same, the entire recording paper There is an advantage that the time until printing is completed is early. Although such a configuration has been put to practical use, the advantage of shortening the overall length of the component parts and making the mechanical characteristics advantageous is great, so the image forming section of the majority of printer devices in practical use Is a configuration in which the recording paper is conveyed with the conveyance direction of the recording paper as the longitudinal direction and the width direction of the conveyance path as the short direction of the recording paper.

  A second feature common to the three conventional configurations is that the longitudinal dimension of the image forming unit is at least about 10 mm larger than the short dimension of the maximum size recording paper on which the printer can form an image.

  A second feature common to the three conventional configurations is that the longitudinal dimension of the image forming portion is at least about 10 mm larger than the short dimension of the maximum size recording paper on which an image can be formed by the image forming apparatus.

  Side plate members serving as structures are provided on both sides in the conveyance direction of the recording sheet on the conveyance path through which the recording sheet of the image forming unit passes. As described above, the interval between the side plate members is larger than the width direction of the maximum size recording paper, and both ends of the paper feed roller and the element parts related to image formation are supported on the side plate member.

  On the outside of this side plate member, “parts that cannot be designed in the area through which the recording paper passes during printing” or “parts that cannot be placed in the area through which the recording paper passes” can be arranged but should be avoided as much as possible. "Parts to be arranged" are arranged.

  Examples of “parts that cannot be designed in the area where the recording paper passes” include mechanical parts such as gears that drive rollers, fixed parts such as bearings, and the like.

  These parts must be designed to be arranged in the area through which the recording paper passes because the drive must be input to the rollers for conveying the recording paper to avoid interference with the recording paper being conveyed.

  Examples of “components that can be arranged in a region through which recording paper passes but should be avoided as much as possible” include electric components such as a motor, a power supply board, and a control board.

  Since these parts contain many large parts such as motor cases and electrolytic capacitors, avoid placing them as much as possible because the height of the device will increase if placed over the area where recording paper passes. Should be placed.

  In addition, as long as the wiring that dislikes electrical noise such as signal lines to the thermal head is as short as possible, stable operation is guaranteed, so the control board is generally placed on both sides where the wiring can be shortened. is there.

  As described above, appropriate dimensions are required on the outside of the side plate member. For example, the outside dimension is limited to the dimension of the motor that serves as the rotational drive source of the roller, and the longitudinal dimension of the image forming unit is It is determined. It is generally at least about 10 mm larger than the width direction of the maximum size recording paper capable of image formation.

A method for solving these common problems is disclosed in Patent Document 4. As described in Patent Document 4, according to the image forming apparatus of Patent Document 4, the “longitudinal dimension of the recording paper storage part”, “short dimension of the recording paper storage part”, and “longitudinal dimension of the image forming part” An image forming apparatus in which the installation area is determined by the shortest “short dimension of the recording paper storage unit” among the three dimensions and one of the other two dimensions can be realized. Compared to the configuration of the conventional image forming apparatus shown in FIGS. 13, 14, and 15 in which the installation area is determined by two dimensions except the shortest “short dimension of the recording paper storage section” among the three dimensions. Miniaturization is possible.
JP 2002-68519 A Japanese Patent Laid-Open No. 7-68771 JP-A-5-32349 JP 2005-306605 A

  The present invention is a further development of the technology of the printer device having the above-described configuration of Patent Document 4, and has been made in order to realize shortening of the printing time and improvement of reliability of the printer device having the configuration of Patent Document 4. .

  In order to solve the above problems, a configuration of the present invention includes a storage unit that stores recording paper, and a feeding unit that feeds the recording paper stored in the storage unit in parallel with a short side of the stored recording paper. A feeding unit; a regulating member that regulates a side edge position of the recording paper; and a skew feeding roller that feeds the recording paper while pressing the recording paper against the regulating member, and is conveyed by the conveying unit. An image forming unit that forms an image on a recording sheet whose length in a direction orthogonal to the conveyance direction is a predetermined length or less, and a recording sheet fed by the feeding unit. The direction changing means for changing the direction so that the long side of the paper is parallel to the conveying direction and sending it to the conveying means, or sending the recording paper to the conveying means without changing the direction of the recording paper, and the direction changing means Change the direction before feeding the recording paper to the transport means. A mode selection means for selecting one of a mode and a mode in which the direction changing means sends the recording paper to the transport means without changing the orientation of the recording paper; and a mode in which the orientation of the recording paper is not changed by the mode selection means Is selected, and when the long side of the recording paper is longer than the predetermined length, the direction of the recording paper is changed so that the long side is parallel to the transport direction and the recording paper is sent to the transport unit. An image forming apparatus comprising: a control unit that controls the direction conversion unit.

  According to the printer apparatus of the present invention, in addition to the conventional feature that an image forming apparatus having a small installation area can be provided with a minimum dead space, an improvement in printing accuracy and reliability of the printer apparatus is realized. Can do.

FIG. 1 is a plan view and a cross-sectional view of an image forming apparatus according to an embodiment of the present invention.
In FIG. 1, reference numeral 101 denotes a recording paper storage unit, and reference numeral 102 denotes an image forming unit as an image forming unit. The recording paper stored in the recording paper storage unit 101 is fed in the direction E in FIG. Then, the recording paper is rotated 90 degrees and then conveyed to the image forming unit 102, where the image forming unit 102 forms an image on the recording paper.
The characteristic of this image forming apparatus (hereinafter referred to as “E direction”) is that the long side direction L1 of the recording paper in the recording paper storage unit and the longitudinal direction L2 in the image forming unit are orthogonal to each other as shown in the figure. It is.

Hereinafter, the conveying unit of the image forming apparatus will be described.
Reference numeral 103 denotes a paper feed roller which is a first transport unit or feeding unit disposed adjacent to the recording paper storage unit 1, and 104 denotes a paper feed roller 103 for the recording paper stored in the recording paper storage unit 101. It is a recording paper support plate provided on the opposite side. Reference numeral 105 denotes a pair of direction changing rollers (direction changing means or posture changing means) which is a second conveying means arranged on the paper feeding direction side from the recording paper storage unit 101, and reference numeral 106 denotes a recording paper storage unit 102 in the image forming apparatus. Is a pair of conveying rollers which is a third conveying means disposed on the opposite side of.

Reference numeral 107 denotes a conveying roller pair disposed on the downstream side of the image forming unit 2.
Reference numeral 111 denotes a first recording paper conveyance path from the paper feed roller 103 to the direction conversion roller pair 105, and 112 denotes a curved second recording paper from the direction conversion roller pair 105 to the image forming unit 102 via the conveyance roller pair 106. It is a transport path. Reference numeral 113 denotes an opening of the image forming apparatus provided on the sheet feeding direction side of the direction conversion roller pair 105, and 114 denotes an opening for discharging recording paper of the image forming apparatus provided at the end of the image forming unit 2.

FIG. 2 shows the operation of the paper feed roller 103 and the recording paper support plate 104.
The paper feed roller 103 is supported by a paper feed motor (not shown) that is a rotation mechanism so as to be rotationally driven.
As shown in FIG. 2A, at least one of the paper feed roller 103 and the recording paper support plate 104 is retracted by a paper feed solenoid (not shown). The retraction state in which the paper feed roller 103 does not press the recording paper and the pressure contact state in which at least one of them moves in a direction approaching the other as shown in FIG. It is possible to switch between two states.

  In the press-contact state shown in FIG. 2B, the recording paper in the recording paper storage unit 101 is fed in the paper feeding direction by rotating the paper feeding roller 103 in the direction shown in the figure by a paper feeding motor (not shown). It is possible.

FIG. 3 is a view seen from the direction of the arrow X in FIG. 1 in order to show the operation of the direction changing roller pair 105.
The direction changing roller pair 105 includes driving side rollers 105a and 105b and driven side rollers 105c and 105d arranged to face the driving side rollers 105a and 105b. The driving side rollers 105a and 105b are supported by a direction changing motor M1 and a direction changing motor M2 which are rotating mechanisms so as to be rotationally driven.

  The driving side rollers 105a and 105b and the driven side rollers 105c and 105d are configured such that at least one of them can be retracted in a direction away from the other by a direction changing roller direction changing solenoid (not shown) as a driving mechanism. The driving side rollers 105a and 105b and the driven side rollers 105c and 105d are in a retracted state in which they are not in pressure contact with each other (FIG. 3A), and in a pressure contact state in which at least one of them is moved toward the other and pressed against each other (FIG. The two states (b)) can be switched.

  The first conveying roller and the driving rollers 105a and 105b, which are the second conveying rollers, are supported on the same axis but are connected to different direction changing motors M1 and M2.

  As shown in FIG. 3C, the driving side rollers 105a and 105b can be rotated in the same direction, and the driving side rollers 105a and 105b are rotated in opposite directions as shown in FIG. 3D. Is also possible.

  Therefore, when the driving rollers 105a and 105b are rotated in the same direction in a state where the driving rollers 105a and 105b and the driven rollers 105c and 105d are in pressure contact, the recording paper can be fed in the paper feeding direction or the direction opposite to the paper feeding direction. Is possible.

  When the driving rollers 105a and 105b are rotated in opposite directions, the direction of the recording paper can be changed.

  Further, a common tangent line (an arrow F in FIG. 1) in the nip between the pressure-contact driving rollers 105a and 105b and the driven rollers 105c and 105d passes through the second conveying path side 112 instead of the first conveying path 111.

FIG. 4 is a diagram illustrating the operation of the conveying roller pair 106.
The conveyance roller pair 106 includes a driving side roller 106a and a driven side 106b disposed to face the driving side roller 106a.

The driving roller can be driven by a transport motor (not shown) that is a rotation mechanism.
At least one of the driving roller 106a and the driven roller 106b can be moved by a conveying roller solenoid 221 that is a driving mechanism. The conveyance roller solenoid 221 can be switched between a pressure contact state in which the driving roller 106a and the driven roller 106b are in pressure contact with each other (FIG. 4B) and a retracted state in which they are separated (FIG. 4A). .

  By rotating the driving roller 106a in the direction shown in the pressure contact state shown in FIG. 4B, the recording paper can be fed in the direction opposite to the paper feeding direction (C direction in the figure).

The overall operation of the image forming apparatus will be described below with reference to the operation explanatory diagram of FIG. 5 and the flowchart of FIG.
In step S101 of FIG. 6, a control means (not shown) operates a paper feed solenoid (not shown) to move the recording paper support plate 104 downward, and presses the recording paper P and the paper feed roller 103 together.

In step S102, the sheet feeding roller 103 is rotated clockwise by a sheet feeding motor (not shown) to feed one sheet of the lowermost recording sheet.
The next recording paper that does not receive the feeding force directly from the feeding roller 103 is blocked from feeding by the separation friction member.
The fed recording paper P stops after reaching between the pair of direction changing rollers 105 whose leading ends are in a separated state.

  At this time, if the direction change roller pair 105 is in the separated state, the conveyance resistance when the leading edge of the recording paper P enters can be reduced. Therefore, the direction change roller pair 105 is more preferably in the separated state.

  If the direction change roller pair 105 is in a pressure contact state, the conveyance resistance when the leading edge of the recording paper enters must be reduced by a method such as rotating the direction change roller 105.

  In step S103, the direction change roller direction change solenoid (not shown) is operated to hold the recording paper between the drive side rollers 105a and 105b and the driven side rollers 105c and 105d.

In step S104, the direction conversion motors M1 and M2 are rotated in the forward direction to rotate the driving side rollers 105a and 105b in the clockwise direction, and the fed recording paper is conveyed in the feeding direction.
At this time, the state of the paper feed roller and the recording paper support plate is arbitrary.
The state of the conveying roller pair is also arbitrary.

  In this state, the direction change roller pair 105 rotates to convey the lowermost recording paper in the recording paper storage unit in the paper feeding direction and completely pull out from the recording paper storage unit.

  Since the direction changing roller pair 105 is arranged so that the common tangent line at the nip of the direction changing roller pair 105 overlaps the second conveying path 112, the recording paper P is between the first conveying path and the direction changing roller pair 105. It is conveyed in a curved state.

  This pulling-out operation stops after the trailing edge of the fed recording paper P comes out of the recording paper storage unit and further out of the first recording paper transport path 111.

When the trailing edge of the recording sheet P passes through the first conveyance path 111, the recording sheet returns from a curved state to a flat state by its own strainer, and the trailing edge changes the direction toward the second conveyance path 112.
The state at this time is shown in FIG.
The first half of the recording paper P is out of the apparatus through the opening 113.

  At this time, if the sheet feeding solenoid (not shown) is turned off and the sheet feeding roller 103 and the stack of recording sheets are in a non-pressure contact state, the resistance to pull out the recording sheet can be reduced. It is more desirable to be off.

  If the paper feed roller 103 and the bundle of recording papers are in a pressure contact state, the direction changing roller pair 105 must generate a conveying force that exceeds the resistance.

  FIG. 5C is a diagram of the recording paper alignment operation state (step S105) which is the third operation of the image forming apparatus.

  The direction conversion motors M1 and M2 are rotated in the reverse direction so that the direction change roller pair 105 sandwiches the substantially center of the conveyance direction of the recording paper P, and the recording paper is conveyed in the direction opposite to the paper feeding direction and stopped. That is, the distance from the leading edge of the recording paper to the clamping point of the direction change roller pair (D1 in FIG. 5C) and the distance from the trailing edge of the recording paper to the clamping point of the direction conversion roller pair (D2 in FIG. 5C) ) To change the position of the recording paper P by rotating the direction conversion motors M1 and M2 forward or backward.

  In the example of FIG. 5C, the direction conversion motors M1 and M2 are rotated in the reverse direction until the direction conversion roller pair 105 is in a state of sandwiching the substantially center of the conveyance direction of the recording paper P, and the recording paper is in the direction opposite to the paper feeding direction. Has been stopped.

  At this time, the conveying roller pair 106 may be in a separated state in order to allow the recording paper P to pass freely, or may rotate in the same direction as the direction changing roller pair 105 to convey the recording paper.

  In addition, when the center of the direction conversion roller pair 105 and the recording paper feeding direction is substantially coincident at the end of the pulling operation as the second operation, the recording paper alignment operation as the third operation is unnecessary.

  If the center of the recording paper feed direction is on the paper feed direction side with respect to the direction changing roller pair 105, the recording paper is conveyed in the direction opposite to the paper feeding direction, and conversely the recording paper with respect to the direction changing roller pair 105 When the center of the feed direction is on the side opposite to the paper feed direction, the recording paper is conveyed in the paper feed direction.

  At this time, if the conveyance roller pair 106 is in the separated state, the conveyance resistance when conveying the recording paper can be reduced. Therefore, it is more desirable that the conveyance roller pair is in the separated state.

  If the conveyance roller pair is in the pressure contact state, the recording paper conveyance resistance must be reduced by, for example, rotating the direction changing roller.

In any case, if the recording paper is dimensioned so that the recording paper does not reach the conveyance roller pair in the recording paper alignment operation, the state of the conveyance roller pair is arbitrary.
In step S105, the direction of the recording paper P, which is the fourth operation of the image forming apparatus, is changed.
FIG. 5D is a diagram illustrating a recording paper direction changing operation state.

  The state of the paper feed roller 103 and the recording paper support plate 104 is arbitrary, the direction changing roller pair 105 is in a pressure contact state, and the conveyance roller pair 106 is in a separated state.

  In this state, as described in FIG. 3D, the direction conversion motors M1 and M2 are rotated in opposite directions. The drive side rollers 105a and 105b of the direction conversion roller pair 105 are rotated in opposite directions, and the recording paper P is changed in direction by 90 degrees so that the direction of the longer side of the recording paper coincides with the transport direction. This recording sheet direction changing operation stops when the fed recording sheet is rotated about 90 degrees.

  At this time, if the recording paper reaches the conveying roller pair 106 in the process of changing the direction, the conveying roller pair 106 must be in a separated state. If the size is such that no recording paper reaches the conveyance roller pair in the direction changing process (the dimension E in the figure is sufficiently long), the state of the conveyance roller pair 106 may be in pressure contact with each other. .

Further, in the process of changing the direction, a part of the recording paper P is rotated in a state where it is out of the housing of the apparatus through the opening 113.
In this way, the recording paper rotates around the axis parallel to the normal direction of the conveyance path 112 in the curved conveyance path 112.

  FIG. 5E is a diagram illustrating a conveyance state before image formation which is a fifth operation of the image forming apparatus.

  The state of the paper feed roller 103 and the recording paper support plate 104 is arbitrary, and at least one of the direction changing roller pair 105 and the transport roller pair 106 is in a pressure contact state.

  In this state, the roller in the pressure contact state between the direction changing roller pair 105 and the conveying roller pair 106 rotates to convey the recording paper to the image forming unit (step S107).

  This pre-image formation transport operation stops after the leading edge of the recording paper reaches the image forming unit (step S109).

  At this time, either the direction changing roller pair 105 or the conveying roller pair 106 may be conveyed, or both roller pairs may be conveyed in a pressure contact state.

  Further, in the process of the fifth operation, it is also possible to correct the skew of the recording paper, that is, to restrict the direction of the side edge of the recording paper in parallel to the transport direction as in step S108.

  As shown in FIG. 7E, either one of the conveying roller pair 106, for example, the driven roller 106b is arranged to be inclined with respect to the recording sheet conveying direction.

When the recording paper is transported by the transport roller pair 106, the recording paper moves while the side edges are in contact with a reference wall 107 (regulating member) which is a protrusion provided in the transport path. As a result, the side edges of the recording paper are in the transport direction. Parallel with high accuracy.
The rollers arranged obliquely in this way are generally called “slanting rollers”.

In the process of the fifth operation, the direction changing roller pair must be separated in step S107 so as not to cause resistance of the oblique feeding roller.
After the fifth operation, image formation is performed in the image forming unit as shown in FIG.
The transfer start portion of the ink sheet 2c and the leading edge of the recording paper P are conveyed to the position of the thermal head 2a (steps S109 and S110).

  The recording paper P sandwiched and transported between the pair of transport rollers 106 and 107 is sandwiched between the thermal head 2a and the platen roller 2b together with the ink sheet 2c, and the ink on the ink sheet 2c is transferred onto the recording paper P by the heat generated by the thermal head 2a. (Step S111).

  When the printing of the first color is finished, the thermal head 2a is separated from the platen 2b and the pressure contact of the thermal head 2a is released. In order to perform printing of the next color, the recording paper P is transported in the direction opposite to that during printing by the transport roller pairs 106 and 107 (step S113), and the recording paper P is returned to the printing start position.

  At the same time, the ink sheet 2c moves the transfer start portion of the second color to the thermal head (step S109).

Next, the second color is printed by the same operation as the first color.
This operation is repeated to print the third and subsequent colors.
When all color printing is completed (step S112), the recording paper P is discharged (step S114).

  FIG. 7 is a plan view corresponding to FIGS. 5A to 5F and shows the direction of the recording paper in each operation.

  As an example of the direction conversion roller that is most easily controlled with reference to FIG. 7, the alignment operation before the direction conversion operation when the direction change rollers 105a and 105b on the driving side are limited to the case of rotating in the opposite direction at the same peripheral speed; The layout condition of the direction changing roller will be described.

  Hereinafter, with respect to the dimensions of the recording paper, the actual dimensions of the recording paper specified along the curved recording paper are shown, not the dimensions projected on the plan view.

  As described with reference to FIG. 5C, in the recording paper alignment operation, the recording paper is aligned at positions where D1 and D2 in the figure are equal.

FIG. 7C is a plan view showing this state.
When the direction conversion rollers 105a and 105b rotate in the opposite direction at the same peripheral speed, the direction conversion center of the recording sheet becomes the center (P in the drawing) of the direction conversion rollers 105a and 105b.

  In order to perform the image recording operation by transporting the recording paper in the longitudinal direction in the image forming unit, it is necessary to make the center line of the recording paper in the longitudinal direction after turning substantially coincide with the center (L) of the image forming unit.

  The direction conversion rollers 105a and 105b are rotated in the opposite directions at the same peripheral speed, and the center (P in the drawing) of the two direction conversion rollers becomes the rotation center of the recording paper. As described above, the following two conditions are necessary for the center of the image forming unit and the center of the recording paper to substantially coincide after turning.

  The first condition is that the position of the recording sheet before the direction changing operation must be a position where the direction changing roller is at the center of the short side direction of the recording sheet, that is, a position where D1 = D2. .

  A recording sheet alignment operation must be performed to satisfy this condition.

  The second condition is that the two direction changing rollers 105a and 105b should be laid out so as to be substantially symmetrical with respect to the center (L) of the image forming unit, that is, W1 = W2.

  Therefore, the direction changing roller and the image forming unit must be laid out so as to satisfy this condition.

  These two conditions are conditions when the direction changing rollers 105a and 105b rotate in the opposite directions at the same peripheral speed. When the direction conversion rollers 105a and 105b rotate in opposite directions at different peripheral speeds, the above two conditions do not apply because the turning center does not become the center of the direction conversion rollers 105a and 105b. However, the above-described conditions are not necessarily essential if the position of the recording sheet after the rotation is straight as it is and is transported to the image forming unit so that an image can be formed.

  As described above, the image forming apparatus according to the present embodiment is configured such that an image forming operation can be performed in the image forming unit after the fed recording paper is rotated approximately 90 degrees by the recording paper direction changing roller.

As a result, the shortest “recording paper” among the three dimensions “longitudinal dimension of the recording paper storage section”, “short dimension of the recording paper storage section”, and “longitudinal dimension of the image forming section”. An image forming apparatus in which the installation area is determined by the “short dimension of the storage portion” and one of the other two dimensions can be realized. In addition, the projection area of the image forming apparatus can be significantly reduced as compared with the conventional configuration.
The above is the same configuration and characteristics as in Patent Document 4.

Hereinafter, the operation of the recording paper that is not the maximum size, which is a feature of the present invention, will be described.
FIG. 7 is a plan view when printing the maximum size recording paper, whereas FIG. 8 is a plan view when passing recording paper that is not the maximum size, and the direction of the recording paper in each operation Is shown.

  The image forming unit 2 forms an image on the recording paper conveyed by the conveying unit 105. The image forming unit 2 can form an image on a recording sheet whose length in the direction orthogonal to the conveyance direction of the recording sheet is shorter than the predetermined length W1, but the length in the direction orthogonal to the conveyance direction is the predetermined length W1. Images cannot be formed on longer recording paper. That is, when a recording sheet having a long side longer than the predetermined length W1 is conveyed in a direction parallel to the short side, an image cannot be formed as it is. However, when the length of the short side is shorter than the predetermined length W1, the posture is changed so that the recording paper is rotated and conveyed in a direction parallel to the long side, and the short side is orthogonal to the conveyance direction. The image can be formed if it is directed to.

  If the recording paper has a length shorter than the predetermined length W1 in the direction orthogonal to the transport direction, image formation is possible without rotation.

  As shown in FIG. 8, in the case of a recording paper having a width W2 that is sufficiently narrower than the width W1 of the image forming unit, an image can be formed as it is even if it is conveyed in parallel without turning 90 ° as shown in FIG. is there.

  However, if skew or the like occurs during paper feeding, printing accuracy may deteriorate in the image forming process, and jamming may occur due to skewed recording paper.

  However, even if an image can be formed as it is even if it is conveyed in parallel without turning 90 °, it is possible to use the skew feeding roller 106 by turning the recording paper slightly obliquely and using the skew feeding roller 106. Line correction can be performed.

  At this time, the reason why the skew feeding roller is used after turning the recording paper by tilting approximately 90 ° and tilting it slightly is to perform skew correction with the skew feeding roller and the reference wall.

  Actually fed recording paper is rarely skewed greatly, and the actual inclination is not so large.

  Since a recording sheet with a small inclination may pass without following the reference wall, there is a case where a minute inclination is difficult to be corrected.

  Therefore, when it is possible to turn the recording paper as in this embodiment, it is possible to perform skew correction with higher accuracy by intentionally increasing the inclination and then moving it to the reference wall with the skew feeding roller. is there.

  This is the reason why recording paper of a size that does not need to be rotated is also rotated.

  Even if the recording paper has a size that does not need to be swiveled in this way, the printing accuracy can be improved by turning the recording paper approximately 90 ° and tilting the recording paper slightly obliquely and correcting the skew by the skew feeding roller 106. Because it improves and improves reliability, there are great benefits.

  As described above, according to the image forming apparatus of the present embodiment, among the three dimensions “longitudinal dimension of the recording paper storage unit”, “short dimension of the recording paper storage unit”, and “longitudinal dimension of the image forming unit”. Thus, an image forming apparatus can be realized in which the installation area is determined by the shortest “short dimension of the recording paper storage unit” and one of the other two dimensions. Compared to the conventional image forming apparatus in which the installation area is determined by two dimensions excluding the shortest “short dimension of the recording paper storage unit” among the three dimensions, the size can be greatly reduced. Furthermore, even for recording paper of a size that does not need to be swiveled, printing accuracy is improved by turning the recording paper approximately 90 ° and tilting the recording paper slightly obliquely to perform skew correction by the skew feeding roller 106. At the same time, reliability is improved.

FIG. 11 is a circuit diagram of this embodiment.
Reference numeral 200 denotes a control means, which is a CPU that issues various control commands, 201 is a ROM in which control data and the like are written, and 202 is a RAM that is an area for developing recording data and the like.

  Reference numeral 203 denotes a conveyance motor that drives the conveyance roller 16, 204 denotes an ink sheet motor for winding up an ink sheet, and 205 denotes a paper type sensor that detects the type and size of the recording paper stored in the recording paper storage unit 101. . The recording paper storage unit 101 is a cartridge that stores recording paper and is detachable from the main body of the image forming apparatus. The shape of the detection protrusions and the number of detection protrusions formed on the cartridge are detected by a paper type sensor on the main body side. Read and determine the size and type of recording paper.

  Reference numeral 206 denotes a mode switching means (mode selection means), which is a mode for changing the direction before image formation when the recording paper determined by the paper type sensor 205 has a size that allows image formation without changing the direction. This is for switching to a mode in which the direction is not changed. The mode switching means may be a switch provided in the image forming apparatus, or a host device that is connected to the image forming apparatus and sends a switching signal to the image forming apparatus.

FIG. 12 is a flowchart of this embodiment.
Since the image forming operation and the change in the orientation of the recording paper have already been described, they will be briefly described here.

  In step S201, paper is fed from the recording paper storage unit. In step S202, it is determined which one of the mode for changing the orientation of the recording paper regardless of the size and the mode for omitting the orientation change when not necessary are selected. If the recording paper has a size that allows image formation without changing the orientation, and if the mode for omitting the orientation change is selected, the process proceeds to step S203.

  In step S203, the size and type of the recording paper are determined from the signal detected by the paper type sensor 205, and it is determined whether or not it is necessary to change the orientation of the recording paper. If it is necessary to change the orientation, the process proceeds to step S204, and the recording operation is performed after the orientation of the recording paper is changed so that the direction of the long side of the recording paper coincides with the transport direction. Even if the posture is not changed, if the length of the recording sheet in the direction perpendicular to the transport direction is shorter than the predetermined length W1, the posture is not changed and the process proceeds to step S205 to start the recording operation.

  If the mode for changing the orientation of the recording paper regardless of the size is selected in step S202, the process proceeds to step S204, and the orientation of the recording paper is changed so that the direction of the long side of the recording paper matches the transport direction. After that, perform the recording operation.

  In the recording operation, steps such as ink sheet cueing (step S205), recording paper cueing (step S206), and printing (S207) are performed for each color type of the ink sheet. If it is determined in step S208 that printing has been completed for all colors, a paper discharge operation (step S210) is performed.

  In the present invention, the printing method is not particularly limited, but the present invention can obtain an effect without particularly limiting the recording method.

  Therefore, it can be widely applied to various recording systems such as an electrophotographic system, an inkjet system, a thermal system, and a thermal transfer system.

  In the present invention, an example has been described in which a paper feed roller is provided on the lower layer side of the recording paper storage unit and paper is fed from the lower layer, but as shown in FIG. 9, a paper feed roller is provided on the upper layer side to feed paper from the upper layer. The same effect can be obtained.

  In the present invention, the method for replenishing the recording paper into the recording paper storage unit may be a detachable configuration in which the recording paper storage unit is pulled out from the apparatus and the recording paper is replenished. The same effect can be obtained with a configuration in which the recording paper storage section is fixed to the apparatus and the recording paper is replenished by opening an opening / closing lid provided in the apparatus.

Moreover, the same effect can be acquired, without specifically limiting the attachment / detachment direction and the opening / closing direction.
In the present embodiment, the separation method is not particularly limited, but the same effect can be obtained regardless of the separation method such as claw separation or retard separation.

  In the present exemplary embodiment, the configuration in which the recording paper storage unit is on and the image forming unit is on the bottom has been described. An effect can be obtained.

  In the present embodiment, the driving side and the driven side of the second and third transport rollers are limited as shown, but the same effect can be obtained even if the driving side and the driven side are opposite.

  Also, the driven side need not be a roller, and the same effect can be obtained with a configuration in which a fixed rigid body or elastic member that does not rotate is provided as long as the driving-side transport roller can generate sufficient frictional force for paper transport. Obtainable.

  In realizing the operation described in the present embodiment, the stop trigger for each operation is used in combination with both open loop control that is determined by the rotation speed of each roller and closed loop control that is provided with a sensor to detect the position of the recording paper. The same effect can be obtained by the method.

  Although the closed loop control has higher accuracy, the reliability of the apparatus is improved, but it goes without saying that the mechanism and control tend to be complicated because a sensor or the like is required.

  In the present embodiment, the example in which the recording paper direction changing means is configured by such two pairs of rollers has been described. However, several specific mechanisms for the recording paper direction changing means have already been proposed. Yes. For example, as proposed in Japanese Patent Laid-Open No. 2002-234636, the central portion of the recording paper is inserted between the front and back and rotated, or the conveyance roller and the recording paper as proposed in Japanese Patent Laid-Open No. 9-40230 are used. There is also a method in which a couple is generated by a contact member that contacts the surface.

  In addition, for recording paper of a smaller size that can be expected to have a problem such that the length in the feed direction during image formation becomes too short when it is turned by approximately 90 °, it is the same even if it is turned by approximately 180 ° as shown in FIG. The effect of can be obtained.

  According to the printer apparatus of the present invention, the shortest “paper storage portion short” among the three dimensions of “long size of paper storage portion”, “short size of paper storage portion”, and “longitudinal dimension of image forming portion”. A printer apparatus in which the installation area is determined by either “hand size” or the other two dimensions can be realized. Compared to the conventional printer apparatus in which the installation area is determined by two dimensions excluding the shortest “short dimension of the paper storage portion” among the three dimensions, the size can be greatly reduced. Further, even if the recording paper has a size that does not need to be rotated 90 °, the recording paper is inclined slightly 90 ° or 180 °, and the recording paper is inclined slightly, and the skew feeding roller 106 is used. Performing line correction improves the printing accuracy and at the same time improves the reliability, so the effect of the present invention is great.

FIG. 3 is an explanatory diagram of a printer that is an embodiment of the invention. Explanatory drawing of operation | movement of the printer which is embodiment of this invention. Operation | movement explanatory drawing of embodiment of this invention. Operation | movement explanatory drawing of embodiment of this invention. Operation | movement explanatory drawing of embodiment of this invention. The flowchart of embodiment of this invention. Operation | movement explanatory drawing of embodiment of this invention. Operation | movement explanatory drawing of embodiment of this invention. Operation | movement explanatory drawing of embodiment of this invention. Operation | movement explanatory drawing of embodiment of this invention. The circuit diagram of the embodiment of the present invention. The flowchart of embodiment of this invention. 1 is a configuration diagram of a conventional printer. 1 is a configuration diagram of a conventional printer. 1 is a configuration diagram of a conventional printer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper storage part 2 Image formation part 3 Recording paper rotation means 101 Recording paper storage part 102 Image formation part 103 Paper feed roller 105 Direction change roller pair 106 Conveyance roller pair 105a Drive side roller 105b Drive side roller 105c Drive side roller 105d Drive side roller

Claims (8)

A storage section for storing recording paper;
A feeding means for feeding the recording paper stored in the storage unit in parallel with a short side of the recording paper in a stored state;
A regulating member for regulating the side edge position of the recording paper;
A conveying means for conveying the recording paper, having a skew feeding roller that conveys the recording paper while pressing the recording paper against the regulating member;
An image forming unit that forms an image on a recording sheet that is transported by the transport unit and has a length in a direction orthogonal to the transport direction of a predetermined length or less;
The recording means fed by the feeding means is sent to the conveying means while changing the direction so that the long side of the recording paper is parallel to the conveying direction, or the conveying means without changing the orientation of the recording paper Direction changing means to send to,
Either the mode in which the direction changing means changes the direction of the recording paper and then sending the recording paper to the conveying means, or the mode in which the direction changing means sends the recording paper to the conveying means without changing the direction of the recording paper Mode selection means for selecting
When the mode that does not change the orientation of the recording paper is selected by the mode selection means, and the long side of the recording paper is longer than the predetermined length, the recording paper is set so that the long side is parallel to the transport direction. Control means for controlling the direction changing means so as to change the direction of the direction to be sent to the conveying means;
An image forming apparatus comprising: 2. The image according to claim 1, wherein the conveyance unit conveys the recording paper in a direction substantially parallel to a paper surface of the recording paper stored in the storage unit when the image forming unit forms an image. Forming equipment. A curved conveyance path that guides the recording paper fed by the feeding means to the image forming means, and the direction changing means is a recording paper centering on an axis parallel to a normal direction of the curved conveyance path. The image forming apparatus according to claim 1, wherein the orientation of the recording paper is changed by rotating the. The direction changing means conveys the recording paper in the first direction when receiving the recording paper from the feeding means, and changes the direction of the recording paper in the second direction opposite to the first direction. The image forming apparatus according to claim 1, wherein the image forming apparatus is conveyed. 5. The image forming apparatus according to claim 4, wherein when the direction changing unit changes the direction of the recording sheet, a part of the recording sheet is exposed outside the housing of the image forming apparatus. . A first recording paper conveyance path for guiding the recording paper from the feeding means to the direction changing means, and the recording paper to the image forming means when the direction changing means conveys the recording paper in the second direction; The image forming apparatus according to claim 4, further comprising a second recording paper conveyance path for guiding. 2. The conveyance roller according to claim 1, wherein the conveyance unit includes a conveyance roller pair that sandwiches the sheet, and the conveyance roller pair is separated when the direction changing unit is changing the direction of the recording paper. Image forming apparatus. The image forming apparatus according to claim 1, wherein the storage unit is disposed so as to overlap the image forming unit.

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