JP6255854B2 - Recording device - Google Patents

Description

  The present invention relates to a recording apparatus that records an image on a recording medium.

  In Patent Document 1, a first image forming unit including a recording head for ejecting ink, and a second image including a photosensitive drum and a transfer roller, which are disposed on the downstream side of the recording medium conveyance path with respect to the first image forming unit. An image forming apparatus including the image forming unit is described. The image forming apparatus includes a first registration roller pair 12a and 12b disposed upstream of the first image forming unit and a first image forming unit and a second image forming unit along the transport path. And a pair of conveying rollers 13a and 13b disposed between the two. In this image forming apparatus, a monochrome image is formed on a recording medium by a second image forming unit using an electrophotographic method, and a color image is formed by a first image forming unit using an inkjet method.

JP-A-8-272258

  In the image forming apparatus described in Patent Document 1, the distance between any one of the first registration roller pair 12a, 12b and the conveyance roller pair 13a, 13b (conveyance roller pair) and the photosensitive drum and the transfer roller is separated. It is considered that the distance is set longer than the length in the recording medium conveyance path. Therefore, the present inventor examined the case where one recording medium is sandwiched between both the photosensitive drum, the transfer roller, and the conveying roller pair by shortening the separation distance in order to reduce the size of the apparatus itself. However, the following problems were discovered.

  In general, when one image forming apparatus includes one image forming unit, a main transport roller pair having a relatively high transport force is provided in order to ensure the transport accuracy of the recording medium. Even when two image forming units are provided in one image forming apparatus, it is considered that a main conveying roller pair having a relatively high conveying force exists for each image forming unit. In the image forming apparatus described in Patent Document 1, for example, it is considered that the conveyance roller pair corresponds to the main conveyance roller pair for the first image forming unit, and the second image forming unit is photosensitive. It is considered that the drum and the transfer roller correspond to the main conveyance roller pair. It is very difficult to set the two main conveyance roller pairs corresponding to the first and second image forming units to the same conveyance speed. For this reason, when the conveyance speed by the conveyance roller pair is slower than the conveyance speed by the photosensitive drum and the transfer roller, the recording medium on which an image is recorded while being conveyed by the photosensitive drum and the transfer roller has a conveyance load by the conveyance roller pair. Take it. As a result, the image recorded by the photosensitive drum and the transfer roller may be disturbed.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a recording apparatus that can suppress a reduction in image quality recorded by an image recording unit while downsizing the apparatus.

A recording apparatus according to the present invention includes a transport unit that transports a recording medium along a predetermined transport path, and a liquid discharge head in which a discharge port that discharges liquid is formed. A first image recording unit configured to record an image by discharging liquid from the plurality of discharge ports, and disposed downstream of the first image recording unit in the conveyance path, and the photosensitive member and the photosensitive member A second image recording unit configured to transfer a toner image carried on the photosensitive member to the recording medium and record the image on the recording medium, the image forming apparatus including a transfer roller that sandwiches the recording medium with the body. A control unit that controls the transport unit to transport the recording medium and controls the second image recording unit to perform image recording on the recording medium by the second image recording unit. The transport unit is disposed along the transport path upstream of the first image recording unit or between the first image recording unit and the second image recording unit, and the photosensitive unit in the transport path. A conveying roller pair disposed at a position where a separation distance between the body and the transfer roller is less than a length along the conveying path of the recording medium, and the conveying path includes the first image recording unit. A first path for conveying the first image recording unit to the second image recording unit, and the conveying unit includes a first guide that defines the first path, and the first guide has a thickness of a recording medium. With respect to the direction, the first path is partially enlarged, and an enlarged portion capable of accommodating a recording medium bent due to a speed difference of the recording medium between the conveying roller pair, the photosensitive member, and the transfer roller is configured. And constituting the first guide One guide of the pair of guides is rotatable about one end along the first path, and the first position and at least part of the guide from the other guide than when it is at the first position. It is configured to be movable between a second position and a second position, and in the second position, the enlarged portion is configured to bias the one guide from the second position toward the first position. A biasing member; and a regulating member that positions the one guide at the first position against a biasing force by the biasing member. The urging force of the urging member is set to be smaller than the waist of the recording medium, and the control unit is configured such that the recording medium conveying speed by the conveying roller pair is the recording medium at the second image recording unit. When the image is recorded on the recording medium, the conveyance unit is controlled to be larger than the conveyance speed of the recording medium by the photosensitive member and the transfer roller , and the first image recording unit records the image on the recording medium. The transport unit is controlled so as to be equal to or lower than the transport speed of the recording medium by the photoconductor and the transfer roller .

According to this, when the second image recording unit records an image on the recording medium, the recording medium bends between the conveyance roller pair, the photosensitive member, and the transfer roller, and it is possible to suppress the conveyance load due to the conveyance roller pair. It becomes. For this reason, it is possible to suppress a decrease in image quality recorded by the second image recording unit while downsizing the apparatus. In addition, when the second image recording unit records an image on the recording medium, it is possible to effectively accommodate the recording medium bent due to the speed difference of the recording medium between the conveyance roller pair, the photosensitive member, and the transfer roller. Become. Moreover, when one guide takes the 2nd position, it becomes possible to comprise an enlarged part easily. In addition, since one guide takes the first position, it is possible to configure a path without an enlarged portion. For this reason, when image recording is performed by the first image recording unit, it is possible to transport the recording medium along a path without an enlargement unit, and it is possible to suppress the occurrence of jamming of the recording medium. Moreover, since one guide moves to the 1st position and the 2nd position by rotation, the movement of one guide is realizable by simple structure. In addition, when the second image recording unit records an image on the recording medium, the recording medium is bent, and the one guide is moved to the second position as the bent recording medium comes into contact with the one guide. For this reason, the bent recording medium can be effectively accommodated in the enlarged portion.

  In the present invention, the first image recording unit further includes a first moving unit that reciprocates the liquid ejection head in a direction orthogonal to a direction along the conveyance path of the recording medium. The control unit intermittently conveys the recording medium along the conveyance path, and ejects liquid from the ejection port while reciprocating the liquid ejection head in the orthogonal direction to form an image on the recording medium. It is preferable to control the transport unit and the first image recording unit so as to perform recording. Thereby, serial printing by the first image recording unit becomes possible.

  In the present invention, it is preferable that the control unit controls the transport unit to continuously transport the recording medium when the second image recording unit records an image on the recording medium. Accordingly, the recording medium is intermittently conveyed when the first image recording unit performs image recording, and the recording medium is continuously conveyed when the second image recording unit performs image recording. This makes it easy to set the speed difference of the recording medium between the conveying roller pair, the photosensitive member, and the transfer roller when performing image recording in the second image recording unit.

  In the present invention, it is preferable that the enlarged portion is disposed on the side of the recording medium facing the surface opposite to the recording surface.

In another aspect, the recording apparatus of the present invention includes a transport unit that transports a recording medium along a predetermined transport path, and a liquid discharge head in which a discharge port that discharges liquid is formed. A first image recording unit configured to record an image by discharging liquid from the plurality of ejection ports to a recording medium to be conveyed, and disposed downstream of the first image recording unit in the conveyance path; And a transfer roller that sandwiches the recording medium between the photosensitive member and the photosensitive member, and is configured to transfer the toner image carried on the photosensitive member to the recording medium and record the image on the recording medium. A second image recording unit, and a control unit that controls the conveying unit to convey the recording medium and controls the second image recording unit to perform image recording on the recording medium by the second image recording unit And. The conveyance path includes a first path for conveying a recording medium from the first image recording unit to the second image recording unit, and a branch from the middle of the first path to pass the second image recording unit. A second path for detouring, and the transport unit is disposed upstream of the first image recording unit or between the first image recording unit and the second image recording unit along the transport path A pair of conveying rollers disposed at a position where a separation distance between the photosensitive member and the transfer roller in the conveying path is less than a length along the conveying path of the recording medium, and the first path is defined. A first guide, a second guide that defines the second path, a first state in which the recording medium can be conveyed to the second image recording unit via the first path, and the recording medium from the first path. It is possible to take a second state that can be conveyed to the second path The first guide is partially enlarged in the thickness direction of the recording medium, and the recording on the pair of conveying rollers, the photosensitive member, and the transfer roller is performed on the first guide. An enlarged portion capable of accommodating a recording medium bent due to a medium speed difference is configured, and the second path is configured to branch from the upstream side of the enlarged portion in the transport path. The control unit causes the flap to take the first state when the second image recording unit performs image recording on the recording medium, and also performs the image recording on the recording medium by the first image recording unit. The switching unit is controlled so that the flap takes the second state, and the recording medium conveyance speed by the conveyance roller pair is determined when the second image recording unit records an image on the recording medium. The transport unit is controlled to be faster than the transport speed of the recording medium by the photoconductor and the transfer roller.
According to this, when the second image recording unit records an image on the recording medium, the recording medium bends between the conveyance roller pair, the photosensitive member, and the transfer roller, and it is possible to suppress the conveyance load due to the conveyance roller pair. It becomes. For this reason, it is possible to suppress a decrease in image quality recorded by the second image recording unit while downsizing the apparatus. In addition, when the first image recording unit performs image recording, the influence of conveyance by the photosensitive member and the transfer roller is eliminated. For this reason, the image quality recorded by the first image recording unit can be maintained. In addition, it is possible to prevent the liquid discharged to the recording medium from adhering to the photoconductor. In addition, when the second image recording unit records an image on the recording medium, it is possible to effectively accommodate the recording medium bent due to the speed difference of the recording medium between the conveyance roller pair, the photosensitive member, and the transfer roller. Become.

According to the recording apparatus of the present invention, when the second image recording unit records an image on the recording medium, the recording medium is bent between the conveying roller pair and the photosensitive member and the transfer roller, thereby suppressing the conveying load by the conveying roller pair. It becomes possible to do. For this reason, it is possible to suppress a decrease in image quality recorded by the second image recording unit while downsizing the apparatus. In addition, when the second image recording unit records an image on the recording medium, it is possible to effectively accommodate the recording medium bent due to the speed difference of the recording medium between the conveyance roller pair, the photosensitive member, and the transfer roller. Become. Moreover, when one guide takes the 2nd position, it becomes possible to comprise an enlarged part easily. In addition, since one guide takes the first position, it is possible to configure a path without an enlarged portion. For this reason, when image recording is performed by the first image recording unit, it is possible to transport the recording medium along a path without an enlargement unit, and it is possible to suppress the occurrence of jamming of the recording medium. Moreover, since one guide moves to the 1st position and the 2nd position by rotation, the movement of one guide is realizable by simple structure. In addition, when the second image recording unit records an image on the recording medium, the recording medium is bent, and the one guide is moved to the second position as the bent recording medium comes into contact with the one guide. For this reason, the bent recording medium can be effectively accommodated in the enlarged portion.
According to another aspect of the recording apparatus of the present invention, when the second image recording unit records an image on the recording medium, the recording medium bends between the conveying roller pair and the photosensitive member and the transfer roller, and the conveying roller It becomes possible to suppress the conveyance load by the pair. For this reason, it is possible to suppress a decrease in image quality recorded by the second image recording unit while downsizing the apparatus. In addition, when the first image recording unit performs image recording, the influence of conveyance by the photosensitive member and the transfer roller is eliminated. For this reason, the image quality recorded by the first image recording unit can be maintained. In addition, it is possible to prevent the liquid discharged to the recording medium from adhering to the photoconductor. In addition, when the second image recording unit records an image on the recording medium, it is possible to effectively accommodate the recording medium bent due to the speed difference of the recording medium between the conveyance roller pair, the photosensitive member, and the transfer roller. Become.

1 is a schematic side view showing an internal structure of a recording apparatus according to the present invention. It is a schematic side view of the enlarged part which the guide pair shown in FIG. 1 comprises, and its vicinity part. It is a schematic side view of the switching part shown in FIG. 1, and its vicinity part, (a) shows the condition of a flap in a 1st state, (b) shows the condition of a flap in a 2nd state. FIG. 2 is a block diagram illustrating an electrical configuration of a printer. FIG. 2 is a flowchart showing a control flow relating to a recording operation of the recording apparatus of FIG. 1. FIG. 9 is a schematic side view of a guide pair, a biasing member, and a regulating member of a recording apparatus according to a modification, where (a) shows a situation where the lower guide takes the first position, and (b) shows the lower guide takes the second position. Indicates the situation. FIG. 10 is a schematic side view of a moving unit of a recording apparatus according to another modification, where (a) shows a state in which the photosensitive drum and transfer roller, a heating roller and a pressure roller are in contact, and (b) shows the photosensitive drum and transfer. The roller, the heating roller, and the pressure roller are in a separated state. FIG. 10 is a schematic side view of a guide pair of a recording apparatus according to still another modified example and the vicinity thereof.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  First, the overall configuration of the recording apparatus 1 according to the present invention will be described with reference to FIG. The recording apparatus 1 includes a first image recording unit 10 using an ink jet method and a second image recording unit 20 using an electrophotographic method. The recording apparatus 1 is provided with a paper feeding device 2 on the left side in FIG. 1 and a paper discharge unit 3 on the right side in FIG. Between the sheet feeding device 2 and the paper discharge unit 3, a conveyance unit 30 is provided that conveys the paper (recording medium) P conveyed from the paper supply device 2 toward the paper discharge unit 3. The transport unit 30 has a transport path that is a path through which the paper P is transported from the paper feeding device 2 to the paper discharge unit 3, and this transport path is connected to the first image recording unit from the paper feed device 2. 10 and the second image recording unit 20 through the main transport route R1 (first route) to the paper discharge unit 3, and a bypass route that bypasses the second image recording unit 20 by branching from a part of the main transport route R1. R2 (second route). Further, the recording apparatus 1 is provided with a control unit 4 that controls these operations. The paper P stored in the paper feeding device 2 is a standard paper having a predetermined size (for example, A4).

  As shown in FIG. 1, the paper feeding device 2 has a paper storage unit 2 a that can store a plurality of stacked paper sheets P, and a paper P that is uppermost in the paper storage unit 2 a toward the transport unit 30. A sheet feeding roller 2b that feeds out and a sheet feeding motor 2M (see FIG. 4) that is controlled by the control unit 4 and drives the sheet feeding roller 2b. In this configuration, the sheet P is sent to the transport unit 30 by rotating the sheet feeding roller 2 b in contact with the sheet P under the control of the control unit 4.

  The first image recording unit 10 includes a serial type head 11, a moving unit 14, and a plurality of cartridges (not shown). Each of the plurality of cartridges is detachably attached to the recording apparatus 1. Each cartridge stores ink of different colors. For example, black, cyan, magenta, and yellow ink are stored in each cartridge. Each cartridge is connected to the head 11 via a tube and a pump (both not shown), and ink of each color is supplied to the head 11. In this embodiment, the color type head 11 is employed, but a monochrome type head may be employed. In this case, black ink is stored in the cartridge.

  The moving unit 14 (first moving unit) includes a carriage 12, a guide rail 13, a moving mechanism (not shown) that reciprocates the carriage 12 along the guide rail 13, and a carriage motor 10M that drives the moving mechanism (see FIG. 4). As shown in FIG. 1, the guide rail 13 extends along the main scanning direction (the direction perpendicular to the transport direction A in which the paper P is transported by the transport unit 30 and the direction perpendicular to the paper surface in FIG. 1). It is supported by a casing (not shown) of the recording apparatus 1. The carriage 12 is supported on the guide rail 13 so as to be movable in the main scanning direction.

  The head 11 has a substantially rectangular parallelepiped shape, and its side surface is supported by the carriage 12. The lower surface of the head 11 is an ejection surface 11a having a plurality of ejection openings. During recording, ink of each color is ejected from a plurality of ejection ports. That is, the head 11 includes a plurality of discharge ports, a liquid passage (not shown) connected to each of the plurality of discharge ports, an energy operation portion (not shown) provided in the middle of the liquid passage, and the energy action. Energy generating means (not shown) for generating energy for acting on the liquid in the section to discharge the liquid. As this energy generation means, a liquid discharge method using an electromechanical transducer such as a piezo element, a liquid discharge using an energy generation means that emits heat by irradiating electromagnetic waves such as a laser, and discharges droplets by the action of the heat generation. And a liquid discharge method using energy generating means for heating the liquid with an electrothermal transducer such as a heating element having a heating resistor to discharge the liquid. The head 11 is supported by the guide rail 13 via the carriage 12, and a predetermined gap suitable for recording is formed between the ejection surface 11 a and the platen 35.

  In this configuration, by driving the carriage motor 10M under the control of the control unit 4, the head 11 reciprocates in the main scanning direction together with the carriage 12 via the moving mechanism. At this time, the control unit 4 controls the head 11 and ejects ink from a plurality of ejection ports at a desired timing, thereby recording an image on the paper P arranged facing the ejection surface 11a (performs serial printing). )be able to.

  The second image recording unit 20 is disposed downstream of the first image recording unit 10 in the transport direction A. The second image recording unit 20 includes a photosensitive drum 21, a transfer roller 22, a developing roller 23, a layer thickness regulating blade 24, a supply roller 25, a charger 26, a scanner unit 27, a toner storage box 29, a fixing unit 28, and In addition, a drive motor 20M (see FIG. 4) for driving the photosensitive drum 21 is included, and an image is recorded on the paper P by an electrophotographic method (described later). The photosensitive drum 21 is disposed so as to face the upper surface of the paper P. In other words, the photosensitive drum 21 is disposed so as to be able to face the surface of the sheet P facing the discharge surface 11a when the sheet P passes between the discharge surface 11a and the platen 35. . The transfer roller 22 is disposed so as to be able to sandwich the paper P with the photosensitive drum 21. The transfer roller 22 is a driven roller that rotates when the paper P is conveyed with the photosensitive drum 21. The photosensitive drum 21 and the transfer roller 22 are a pair of main conveyance rollers in the second image recording unit 20, so that the sheet P can be conveyed with a predetermined conveyance force, the holding force for the sheet P between the two, The frictional force with respect to the paper P on the outer peripheral surface is set. In other words, the photosensitive drum 21 and the transfer roller 22 are configured so that the photosensitive drum 21 and the transfer roller 22 are pressed against each other and the friction between the outer peripheral surfaces so that the paper P can be conveyed with a predetermined conveyance force. Coefficients etc. are set. The developing roller 23 is arranged to face the outer peripheral surface of the photosensitive drum 21 with a predetermined interval. The layer thickness regulating blade 24 and the supply roller 25 are disposed so as to face the outer peripheral surface of the developing roller 23. The developing roller 23 and the supply roller 25 are also driven to rotate as the photosensitive drum 21 rotates. The charger 26 and the scanner unit 27 are disposed so as to face the outer peripheral surface of the photosensitive drum 21.

  The fixing unit 28 has a known structure, and includes a heating roller 28a incorporating a heater 28H (see FIG. 4), a pressure roller 28b, and a drive motor 28M (see FIG. 4) for driving the heating roller 28a. doing. The fixing device 28 is disposed downstream of the photosensitive drum 21 and the transfer roller 22 in the transport direction A. The heating roller 28a is disposed so as to face the upper surface of the paper P. In other words, the heating roller 28a is disposed so as to be able to face the surface of the sheet P that faces the discharge surface 11a when the sheet P passes between the discharge surface 11a and the platen 35. . The pressure roller 28b is arranged so that the paper P can be held between the pressure roller 28b and the heating roller 28a. The pressure roller 28b is a driven roller that rotates when the paper P is conveyed by the heating roller 28a. The heating roller 28a and the pressure roller 28b are also set with a clamping force for the paper P between them and a frictional force for the paper P on both outer peripheral surfaces so that the paper P can be transported with a predetermined transport force. ing.

  In this configuration, by driving the drive motor 20M under the control of the control unit 4, the photosensitive drum 21 transports the paper P in the transport direction A (direction toward the paper discharge unit 3) in the counterclockwise direction in FIG. Rotate around. As the photosensitive drum 21 rotates, the developing roller 23 and the supply roller 25 also rotate, and the toner is supplied to the developing roller 23 by the supply roller 25. The toner is positively frictionally charged between the supply roller 25 and the developing roller 23. The toner supplied onto the developing roller 23 enters between the layer thickness regulating blade 24 and the developing roller 23 as the developing roller 23 rotates, and is further developed as a thin layer having a constant thickness while being frictionally charged. It is carried on a roller 23. Further, under the control of the control unit 4, the charger 26 (in this embodiment, for example, a known scorotron charger) uniformly negatively charges the surface of the photosensitive drum 21. The surface of the photosensitive drum 21 is exposed when the scanner unit 27 scans the laser beam at a high speed under the control of the control unit 4. As a result, the potential of the exposed portion is lowered, and an electrostatic latent image based on the image data is formed on the surface of the photosensitive drum 21. Then, by the rotation of the developing roller 23, the toner carried on the developing roller 23 is supplied to the electrostatic latent image formed on the surface of the photosensitive drum 21, and the toner image is formed on the surface of the photosensitive drum 21. It is formed. Then, the paper P is transported between the photosensitive drum 21 and the transfer roller 22, whereby the toner image carried on the surface of the photosensitive drum 21 is transferred onto the paper P. Further, by driving the drive motor 28M under the control of the control unit 4, the heating roller 28a rotates in the same manner as the photosensitive drum 21, and the pressure roller 28b also rotates in a driven manner. When the paper P on which the toner is transferred is conveyed between the rollers 28a and 28b, the toner on the paper P is thermally fixed. As a result, an image is recorded on the paper P. In this embodiment, the photosensitive drum 21 is illustrated as the image carrier, but the image carrier is not limited to this, and includes, for example, the following. First, for example, a photoconductive layer is used as the photoreceptor, and examples of the photoconductor include amorphous silicon, amorphous selenium, zinc oxide, titanium oxide, and organic photoconductor (OPC). The shape for mounting the photoconductor includes, for example, a rotating body such as a drum shape or a belt shape, and a sheet shape.

  The conveyance unit 30 includes four conveyance roller pairs 31 to 34, a platen 35, five guide pairs 41 to 45, a switching unit 50, and conveyance motors 31 </ b> M to 31 </ b> M that drive the conveyance roller pairs 31 to 34 under the control of the control unit 4. 34M (see FIG. 4). The platen 35 is formed of a flat plate member having a plane size that is slightly larger than the length of the ejection surface 11a in the transport direction A and longer in the main scanning direction than the paper P. The platen 35 is disposed at a position facing the ejection surface 11a and supports the paper P.

  The three conveyance roller pairs 31 to 33 are arranged in order along the main conveyance path R1. More specifically, the conveyance roller pair 31 is disposed upstream of the first image recording unit 10 in the conveyance direction A along the main conveyance path R1. Further, the conveyance roller pair 31 has a separation distance between the photosensitive drum 21 and the transfer roller 22 along the main conveyance path R1 and a length along the main conveyance path R1 of the paper P (that is, a length in the conveyance direction A of the paper P). It is arranged at a position that is less than a). In other words, when the paper P is sandwiched between the transport roller pair 31, the leading end of the paper P can be sandwiched between the photosensitive drum 21 and the transfer roller 22. The conveyance roller pair 32 is disposed between the conveyance roller pair 31 and the second image recording unit 20 and downstream of the first image recording unit 10 along the main conveyance path R1. The transport roller pair 33 is disposed downstream of the second image recording unit 20 in the transport direction A along the main transport path R1. The conveyance roller pair 34 is disposed on the detour path R2. Of these transport roller pairs 31 to 34, the transport roller pair 31 is set so that the paper P can be transported with a transport force larger than the transport force of the paper P in the other three transport roller pairs 32 to 34. Has been. That is, the conveyance roller pair 31 is a main conveyance roller pair for accurately conveying the paper P to the first image recording unit 10. Further, the conveyance force of the paper P by the conveyance roller pair 31 has substantially the same conveyance force as the conveyance force of the paper P by the photosensitive drum 21 and the transfer roller 22. In each of the conveyance roller pairs 32 to 34, the driven roller may be constituted by a spur including a plurality of protrusions on the outer peripheral surface.

  An encoder 37 is provided on the driving roller (lower roller in this embodiment) of the conveying roller pair 31. The photosensitive drum 21 is provided with an encoder 38. The encoder 37 is an incremental encoder, has a rotating plate (not shown) that rotates in synchronization with the driving roller of the conveyance roller pair 31, reads a slit formed in the rotating plate, and corresponds to the reading result. Output a signal. Similar to the encoder 37, the encoder 38 is an incremental encoder, has a rotating plate (not shown) that rotates in synchronization with the photosensitive drum 21, reads a slit formed in the rotating plate, and responds to the read result. Output the encoder signal.

  The conveying force by each of the conveying roller pairs 31 to 34 is such that the conveying roller pair 31 to 34 sandwiches the paper P and conveys it in the conveying direction A or in the direction opposite to the conveying direction A. Force required to make the sheet P stand still against the rotational force of each of the transport roller pairs 31 to 34, or completely so as not to rotate each of the transport roller pairs 31 to 34. In this state, the force required to pull out the paper P held between the transport roller pairs 31 to 34 is referred to. The conveyance force by the photosensitive drum 21 and the transfer roller 22 is rotated so that the photosensitive drum 21 and the transfer roller 22 convey the paper P in the conveyance direction A or the direction opposite to the conveyance direction A. Sometimes, the paper P is required to stop against the rotational force of the photosensitive drum 21 and the transfer roller 22, or in a state where the photosensitive drum 21 and the transfer roller 22 are completely stopped so as not to rotate. The force required to pull out the paper P sandwiched between the photosensitive drum 21 and the transfer roller 22. The conveyance force by the heating roller 28a and the pressure roller 28b means that the heating roller 28a and the pressure roller 28b rotate so as to sandwich the paper P and convey it in the conveyance direction A or the direction opposite to the conveyance direction A. When this is done, the paper P is completely stopped so as not to rotate the force necessary to stop the paper P against the rotational force of the heating roller 28a and the pressure roller 28b, or the heating roller 28a and the pressure roller 28b. In this state, the force is required to pull out the paper P sandwiched between the heating roller 28a and the pressure roller 28b. This force can be measured by attaching a force gauge to the paper P. Each of these “conveying forces” is the force that pinches the paper P in each of the conveying roller pairs 31 to 34, the photosensitive drum 21 and the transfer roller 22, the heating roller 28a, and the pressure roller 28b, the conveying roller pairs 31 to 34, It fluctuates depending on the frictional force between the photosensitive drum 21, the transfer roller 22, the heating roller 28a, and the pressure roller 28b and the paper P. In other words, each of the conveying roller pairs 31 to 34, the photosensitive drum 21 and the transfer roller, the heating roller 28a, and the pressure roller 28b varies depending on the force of pressure contact with each other and the friction coefficient of each outer peripheral surface. Note that the conveying force may be obtained by calculation based on the above-described pressing force and the friction coefficient of each outer peripheral surface.

  Of the five guide pairs 41 to 45, three guide pairs 41 to 43 constitute a part of the main transport path R1, and the remaining two guide pairs 44 and 45 constitute a part of the detour path R2. More specifically, the guide pair 41 (first guide) is between the first image recording unit 10 and the second image recording unit 20 and between the conveyance roller pair 32, the photosensitive drum 21, and the transfer roller 22. It consists of two guides 41a and 41b (a pair of guides) constituting the path 41c. As shown in FIG. 2, the two guides 41 a and 41 b constitute an enlarged portion 41 d in which a part of the path 41 c is enlarged in the thickness direction (vertical direction) of the paper P. The guide 41 a has a horizontal guide surface 41 a 1 that faces the paper P. The guide 41b has a guide surface 41b1 that faces the paper P and a part of which is curved downward. The enlarged portion 41d is in the vicinity of the photosensitive drum 21 and the transfer roller 22, and is formed between the guide surfaces 41a1 and 41b1. As described above, since the enlarged portion 41d is formed in the path 41c, the bent portion of the paper P can be effectively accommodated as will be described later.

  The guide pair 42 includes two guides that constitute a path between the photosensitive drum 21 and the transfer roller 22 and the heating roller 28a and the pressure roller 28b. The guide pair 43 includes two guides that form a path between the heating roller 28 a and the pressure roller 28 b and the conveyance roller pair 33. The guide pair 44 (second guide) is connected to an intermediate portion of the guide pair 41 and includes two guides that form a path between the guide pair 41 and the conveying roller pair 34. The guide pair 45 is connected to an intermediate portion of the guide pair 43, and includes two guides that form a path between the conveyance roller pair 34 and the guide pair 43.

  As shown in FIG. 3, the switching unit 50 includes a flap 51 and a rotation unit (not shown) that rotates the flap 51 under the control of the control unit 4. The flap 51 is rotatably supported near the connection portion of the guide pair 44 of the guide pair 41. The flap 51 is supported by the guide 41b so that the vicinity of the downstream end along the main transport path R1 is the center of rotation. In addition, the flap 51 is arrange | positioned in the conveyance direction A upstream from the curved part of the guide 41b. Further, the flap 51 is in a first state (shown in FIG. 3A) in which the paper P can be conveyed to the second image recording unit 20 via the path 41c defined by the guide pair 41. And the second state in which the paper P can be conveyed from the path 41c to the detour path R2 (the state shown in FIG. 3B), the upstream end of the flap 51 is connected to the guide surface 41a1. Contact state). When the flap 51 is in the first state, the bypass route R2 is closed while the main transport route R1 is opened. When the flap 51 is in the second state, the bypass path R2 is opened and the main transport path R1 is closed.

  In the transport direction A, a sensor 36 is provided downstream of the transport roller pair 32 and upstream of the photosensitive drum 21 and the transfer roller 22 (more specifically, the flap 51). The sensor 36 can detect the leading edge of the paper P that is transported along the main transport path R1. When the sensor 36 detects the leading edge of the paper P, the sensor 36 outputs a detection signal.

  In addition to a central processing unit (CPU) that is an arithmetic processing unit, the control unit 4 includes a read only memory (ROM), a random access memory (RAM), an application specific integrated circuit (ASIC), and an I / F. (Interface), I / O (Input / Output Port), timer, etc. are included. The ROM stores programs executed by the CPU, various fixed data, and the like. The RAM temporarily stores data (for example, image data) necessary for executing the program. The ASIC performs rewriting and rearrangement of image data (for example, signal processing and image processing). The I / F performs data transmission / reception with an external device (for example, a PC connected to the printer 1). I / O inputs / outputs detection signals of various sensors. Note that the control unit 4 may not include the ASIC, and image data may be rewritten or rearranged by a program executed by the CPU.

  Based on the encoder signal output from the encoder 37, the control unit 4 controls the carry motor 31M so that the drive roller of the carry roller pair 31 rotates at a preset rotation speed. Further, the control unit 4 controls the drive motor 20M based on the encoder signal output from the encoder 38 so that the photosensitive drum 21 rotates at a preset rotation speed. Here, the conveyance speed of the paper P by the conveyance roller pair 31 is determined based on the rotation speed of the drive roller in the conveyance roller pair 31 and the radius of the drive roller. Further, the conveyance speed of the paper P by the photosensitive drum 21 and the transfer roller 22 is determined based on the rotational speed of the photosensitive drum 21 and the radius of the photosensitive drum 21. Here, the conveyance speed V1 of the paper P by the conveyance roller pair 31 is larger than the conveyance speed V2 of the paper by the photosensitive drum 21 and the transfer roller 22 (V1> V2). The rotational speed of the driving roller and the rotational speed of the photosensitive drum 21 are set.

  As shown in FIG. 4, the control unit 4 includes a paper feed motor 2M, transport motors 31M to 34M, a head 11, a carriage motor 10M, drive motors 20M and 28M, a charger 26, a scanner unit 27, a switching unit 50, and the like. It is connected to the. In addition, the control unit 4 prepares for recording, supplies, conveys, and discharges the paper P so that an image by the ink ejection method or the electrophotographic method is recorded on the paper P based on the recording command received from the external device. The operation and the recording operation synchronized with the conveyance of the paper P are controlled.

  Next, a control flow relating to the recording operation of the recording apparatus 1 will be described below with reference to FIG.

  The recording apparatus 1 stands by until a recording command for recording an image on the paper P is received from an external apparatus (step S1). When the recording command is received (YES), the control unit 4 determines whether the information included in the recording command is image recording by the ink ejection method (step S2). If the control unit 4 determines YES in step S2, the process proceeds to step S3, where the first image recording unit 10 performs image recording by the ink ejection method.

  First, in step S3, the control unit 4 determines whether or not the flap 51 is in the second state. If the flap 51 is in the first state (NO), the control unit 4 controls the switching unit 50 to turn the flap 51 on. The second state is set (step S4). In step S3, when the flap 51 is in the second state, the process proceeds to step S5. In this way, the flap 51 is set in the second state before the leading edge of the paper P passes through the flap 51. Accordingly, the paper P that has passed through the first image recording unit 10 can be advanced to the detour route R2 without being directed to the second image recording unit 20.

  In step S5, the control unit 4 drives the paper feed motor 2M to feed the paper P from the paper storage unit 2a to the transport unit 30. In step S <b> 6, the control unit 4 drives the transport motors 31 </ b> M to 34 </ b> M to transport the paper P toward the paper discharge unit 3. At this time, the control unit 4 controls the two conveyance motors 31M and 32M so as to record the image on the paper P only from the time when the liquid ejection from the head 11 is started until the time when the liquid ejection is finished. Then, the paper P is intermittently conveyed by the conveyance roller pairs 31 and 32. That is, the conveyance roller pairs 31 and 32 repeat conveyance and pause.

  The controller 4 controls the carriage motor 10M and the head 11 to reciprocate the head 11 in the main scanning direction and eject ink at a desired timing when the conveyance by the conveyance roller pairs 31 and 32 is temporarily stopped. Then, an image is recorded on the paper P (step S7). When an image is recorded on the paper P by the first image recording unit 10, the conveyance force by the conveyance roller pair 31 is larger than the other conveyance roller pairs 32 to 34, and the conveyance roller pair 31 becomes the main conveyance roller pair. . The rotation speed of the drive roller of the two rollers constituting the pair of transport rollers 31 is controlled by the control unit 4, so the transport speed of the paper P transported by the pair of transport rollers 31 is relatively good. . For this reason, the quality of the image recorded on the paper P conveyed by the conveyance roller pair 31 is relatively high. Further, since the conveying roller pair 31 has a higher conveying force than the other roller pairs, when conveying the sheet P while the conveying roller pair 31 and the other roller pair sandwich the other roller, the other rollers Less susceptible to paired transport. Thus, the main transport roller pair is a roller pair that can control the transport speed of the transported paper P.

  When the trailing edge of the paper P passes through the head 11, the control unit 4 controls the two transport motors 31M and 32M in step S8 so that the transport roller pair 31, 32 continuously transports the paper P. Switch to. The transport roller pairs 33 and 34 are driven so as to continuously transport the paper P from the beginning. Thus, the sheet P on which an image is recorded by the first image recording unit 10 proceeds to the detour route R2, and is joined by the transport roller pair 34 from the detour route R2 to the downstream portion of the main transport route R1 from the second image recording unit 20. To do. Thereafter, the paper is discharged to the paper discharge unit 3 by the transport roller pair 33 (step S8). Thereafter, the process proceeds to step S17.

  If it is determined NO in step S2, the control unit 4 proceeds to step S9, and the second image recording unit 20 performs image recording by the electrophotographic method. First, in step S9, the control unit 4 controls the heater 28H to heat the heating roller 28a to a predetermined temperature. Next, in step S10, the control unit 4 determines whether or not the flap 51 is in the first state. If the flap 51 is in the second state (NO), the control unit 4 controls the switching unit 50 to control the flap 51. Is in the first state (step S11). In step S10, when the flap 51 is in the first state, the process proceeds to step S12. Thus, the flap 51 is set to the first state before the leading edge of the paper P passes through the flap 51. As a result, the paper P that has passed through the first image recording unit 10 can be advanced to the second image recording unit 20.

  In step S12, the control unit 4 performs the same control as in step S5. Thereafter, in step S <b> 13, the control unit 4 drives the conveyance motors 31 </ b> M to 33 </ b> M to convey the paper P toward the paper discharge unit 3. At this time, the conveyance roller pairs 31 to 33 are driven to continuously convey the paper P.

  In step S <b> 14, the control unit 4 controls the drive motor 20 </ b> M, the charger 26, and the scanner unit 27 in synchronization with the conveyance of the paper P, and rotates toner on the surface of the photosensitive drum 21 while rotating the photosensitive drum 21 and the like. Form an image. Thus, when the paper P is conveyed between the photosensitive drum 21 and the transfer roller 22, the toner image is transferred onto the paper P.

  In steps S13 and S14, the controller 4 drives the drive motor so that the conveyance speed (V2) of the paper P by the photosensitive drum 21 and the transfer roller 22 is smaller than the conveyance speed (V1) of the paper P by the conveyance roller pair 31. Drive 20M. That is, the control unit 4 makes the conveyance speed (V2) of the paper P by the photosensitive drum 21 and the transfer roller 22 smaller than the conveyance speed (V1) of the paper P by the conveyance roller pair 31 (V2 <V1). Based on each encoder signal output from each of the encoders 37 and 38, the drive motor 20M is controlled so that each of the drive roller and the photosensitive drum 21 in the transport roller pair 31 rotates at a preset rotational speed. To do. As a result, when the sheet P conveyed by the pair of conveying rollers 31 and 32 is sandwiched between the photosensitive drum 21 and the transfer roller 22, the sheet P is moved between the pair of guides 41a and 41b due to the difference in the conveying speed of the sheet P. Start to bend. More specifically, the sheet P is gradually bent so as to approach the curved portion of the guide surface 41b1 as indicated by a two-dot chain line in FIG. By bending the paper P in this way, it is possible to suppress the transport load of the transport roller pair 31 when the toner image is transferred to the paper P. That is, the conveyance speed by the conveyance roller pair 31 is higher than the conveyance speed by the photosensitive drum 21 and the transfer roller 22, so that the sheet P conveyed by the photosensitive drum 21 and the transfer roller 22 is received from the conveyance roller pair 31. The load can be suppressed. Further, since the rotation speed of the photosensitive drum 21 is controlled by the control unit 4, the conveyance speed of the paper P conveyed by the photosensitive drum 21 and the transfer roller 22 is relatively high. That is, the transfer accuracy of the toner image onto the paper P conveyed by the photosensitive drum 21 and the transfer roller 22 does not decrease. If the conveyance speed of the paper P by the conveyance roller pair 31 is smaller than the conveyance speed of the paper P by the photosensitive drum 21 and the transfer roller 22, the conveyance roller having a relatively high conveyance force when transferring the toner image to the paper P. The pair 31 becomes a transport load, and the quality of the image recorded by the second image recording unit 20 decreases. That is, back tension is applied to the paper P transported by the photosensitive drum 21 and the transfer roller 22 by the transport roller pair 31, and there is a possibility that white streaks are generated. However, in this embodiment, since the conveyance speed of the paper P by the conveyance roller pair 31 is higher than the conveyance speed of the paper P by the photosensitive drum 21 and the transfer roller 22, the image quality recorded by the second image recording unit 20 is high. The decrease can be suppressed. In addition, since the pair of guides 41a41b constitutes the enlarged portion 41d, the bent portion of the paper P can be effectively accommodated in the enlarged portion 41d.

  In step S15, the control unit 4 controls the drive motor 28M in synchronization with the conveyance of the paper P, and also rotates the heating roller 28a and the pressure roller 28b. At this time, the control unit 4 drives the drive motor 28M so that the conveyance speed of the paper P by the photosensitive drum 21 and the transfer roller 22 is substantially the same as the conveyance speed of the paper P by the heating roller 28a and the pressure roller 28b. To do. The paper P on which the toner image is transferred passes through the heating roller 28a and the pressure roller 28b, whereby the toner on the paper P is thermally fixed, and an image is recorded on the paper P. Thus, the paper P on which the image is recorded is discharged to the paper discharge unit 3 by the transport roller pair 33 (step S16). Thereafter, the process proceeds to step S17.

  In step S17, if a recording command is received next (YES), the process returns to step S2, and if not received (NO), the control flow relating to the recording operation is completed.

  In step S17, if a recording command is received next (YES), the process returns to step S2, and if not received (NO), the control flow relating to the recording operation is completed.

  As described above, according to the recording apparatus 1 according to the present embodiment, when the second image recording unit 20 performs image recording on the paper P, the conveyance roller pair 31, the photosensitive drum 21, and the transfer roller 22 are used. The sheet P is bent, and the conveyance load due to the conveyance roller pair 31 can be suppressed. For this reason, it is possible to suppress a reduction in image quality recorded by the second image recording unit 20 while downsizing the recording apparatus 1.

  Further, the controller 4 intermittently conveys the paper P when the first image recording unit 10 performs image recording, and continuously feeds the paper P when performing image recording with the second image recording unit 20. Transport. As described above, since the paper P is not intermittently conveyed when the second image recording unit 20 performs image recording, the conveyance roller pair 31, the photosensitive drum 21, and the transfer roller 22 when the second image recording unit 20 performs image recording. Setting of the speed difference of the paper P is simplified.

  The flap 51 is in the first state when the first image recording unit 10 records an image on the paper P. Thereby, when the first image recording unit 10 performs image recording, the influence of conveyance by the photosensitive drum 21 and the transfer roller 22 is eliminated. For this reason, the image quality recorded by the first image recording unit 10 can be maintained. In addition, it is possible to prevent the ink discharged on the paper P from adhering to the photosensitive drum 21.

Next, a modification of this embodiment will be described.
As a first modification, instead of the above-described guide pair 41, as shown in FIG. 6, a guide pair 241, an urging member 250, and a regulating member 251 are disposed between the conveying roller pair 32 and the second image recording unit 20. May be provided. In this modification, the switching unit 50 and the detour route R2 are not provided. The guide 241 has two flat guides 241a and 241b spaced apart from each other. A path 241c that is a part of the main transport path R1 is defined between the guides 241a and 241b. The guide 241a is disposed on the upper side and is disposed so as to face the upper surface of the paper P.

  The guide 241b is disposed below and disposed so as to face the lower surface of the paper P. As shown in FIG. 6, the guide 241 b is supported by a shaft 242 so that the right end portion thereof is rotatable. The guide 241b is configured to be rotatable between a first position and a second position with a shaft 242 as a rotation fulcrum. As shown in FIG. 6A, the first position is a position where the guide 241b is held horizontally. As shown in FIG. 6B, the second position is a position farther from the guide 241a than when in the first position, and the path 241c is partially enlarged in the thickness direction of the paper P so that the enlarged portion 241d It is a configured position. In addition, a protrusion 241b1 that protrudes to the right of the shaft 242 is formed at the right end of the guide 241b.

  The urging member 250 is composed of a spring extending obliquely upward to the left in FIG. The urging member 250 has a lower end fixed to the housing of the recording apparatus 1 and an upper end fixed to the lower surface of the left portion of the center of the guide 241b, and urges the guide 241b toward the guide 241a. The urging force of the urging member 250 is set smaller than the waist of the paper P. The biasing force of the biasing member 250 is set to a biasing force that can move the guide 241b from the first position to the second position by the waist of the bent paper P. The urging force of the urging member 250 is set in advance through experiments or the like. The urging member 250 may be formed of any elastic member as long as it can urge the guide 241b toward the guide 241a.

  The restricting member 251 is disposed at a position that contacts the lower surface of the protruding portion 241b1 of the guide 241b when the guide 241b is in the first position. Thereby, even if the guide 241b is urged by the urging member 250, the rotation of the guide 241b is regulated so that the guide 241b is positioned at the first position.

  Next, the operation of the guide 241b when the second image recording unit 20 records an image on the paper P will be described below. Also in this modified example, when the control unit 4 determines NO in step S2 described above, the second image recording unit 20 performs image recording by the electrophotographic method. That is, the control unit 4 controls the paper feed motor 2M, the conveyance motors 31M to 33M, the drive motor 20M, the charger 26, the scanner unit 27, and the drive motor 28M based on the recording command, similarly to the above-described embodiment. .

  At this time, when the paper P transported by the transport roller pairs 31 and 32 is sandwiched between the photosensitive drum 21 and the transfer roller 22, the paper P is moved between the pair of guides 241a and 241b due to the transport speed difference of the paper P. Start to bend. More specifically, as indicated by a two-dot chain line in FIG. 6B, the paper P is gradually bent from the guide 241a toward the guide 241b. Then, as the deflection of the sheet P increases, the guide 241b that comes into contact with the sheet P rotates from the first position to the second position against the urging force of the urging member 250. That is, a gap between the two guides 241a and 241b is increased, and an enlarged portion 241d is configured. By bending the paper P in this way, it is possible to suppress the transport load of the transport roller pair 31 when the toner image is transferred to the paper P. That is, as in the above-described embodiment, the transfer accuracy of the toner image onto the paper P does not decrease. Further, since the enlarged portion 241d is configured in the path 241c, the bent portion of the paper P can be effectively accommodated. Further, since the one guide 241b takes the second position from the first position, the enlarged portion 241d can be easily configured. In addition, when the guide 241b takes the first position, a path 241c without the enlarged portion 241d can be configured. For this reason, when the first image recording unit 10 performs image recording, the paper P can be conveyed through the path 241c without the enlargement unit 241d (that is, the flat path 241c). As a result, jamming of the paper P can be suppressed.

  Further, since the guide 241b is configured to be rotatable around one end (right end) portion, the guide 241b can be moved with a simple configuration. Further, since the urging force of the urging member 250 is set to be smaller than the waist of the paper P, the guide 241b moves to the second position by the contact between the bent paper P and the guide 241b. For this reason, the bent paper P can be effectively accommodated in the enlarged portion 241d.

  As another modification, as shown in FIG. 7, a moving unit 280 (second moving unit) that moves the transfer roller 22 may be provided. The moving unit 280 in this modification includes a support unit 281 and a solenoid 282 that moves the support unit 281 under the control of the control unit 4. The support portion 281 supports the shaft member 22a of the transfer roller 22 so as to be rotatable. The solenoid 282 moves the support portion 281 so as to selectively take a contact state where the photosensitive drum 21 and the transfer roller 22 are in contact with each other and a separation state where the photosensitive drum 21 and the transfer roller 22 are separated from each other. In the contact state, as shown in FIG. 7A, the arrangement relationship is the same as that of the photosensitive drum 21 and the transfer roller 22 in the above-described embodiment. On the other hand, in the separated state, the transfer roller 22 is separated from the photosensitive drum 21 beyond the thickness of the sheet P as shown in FIG. When taking such a separated state, the sheet P conveyed between the photosensitive drum 21 and the transfer roller 22 is supported by the lower transfer roller 22, so that the photosensitive drum 21 is separated from the sheet P. At this time, the conveyance force of the paper P by the photosensitive drum 21 and the transfer roller 22 is equal to zero.

  Moreover, as shown in FIG. 7, you may have the moving part 290 which moves the pressure roller 28b. The moving unit 290 in this modification includes a support unit 291 and a solenoid 292 that moves the support unit 291 under the control of the control unit 4. The support portion 291 rotatably supports the shaft member 28b1 of the pressure roller 28a. The solenoid 292 moves the support portion 291 so as to selectively take a contact state in which the heating roller 28a and the pressure roller 28b are in contact with each other and a separated state in which the heating roller 28a and the pressure roller 28b are separated from each other. Let In the contact state, as shown in FIG. 7A, the arrangement relationship is the same as that of the heating roller 28a and the pressure roller 28b in the above-described embodiment. On the other hand, in the separated state, the pressure roller 28b is separated from the heating roller 28a beyond the thickness of the paper P as shown in FIG. When taking such a separated state, the sheet P conveyed between the heating roller 28a and the pressure roller 28b is supported by the lower pressure roller 28b, so that the heating roller 28a is separated from the sheet P. To do. At this time, the conveyance force of the paper P by the heating roller 28a and the pressure roller 28b is equal to zero.

  The control unit 4 in this other modification controls the solenoid 282 so that the photosensitive drum 21 and the transfer roller 22 are in contact with each other when the second image recording unit 20 records an image on the paper P. Specifically, instead of step S10 described above, the control unit 4 determines whether the photosensitive drum 21, the transfer roller 22, the heating roller 28a, and the pressure roller 28b are in contact with each other. Run. When the photosensitive drum 21 and the transfer roller 22, and the heating roller 28a and the pressure roller 28b are separated (in the case of NO), the control unit 4 replaces the photosensitive drum 21 and the transfer roller 22 with step S11. A step of controlling the heating roller 28a and the pressure roller 28b to be in contact is executed. Further, when the photosensitive drum 21 and the transfer roller 22, and the heating roller 28a and the pressure roller 28b are in contact (in the case of YES), the control unit 4 executes the process of step S12. Thereby, the image can be recorded on the paper P by the second image recording unit 20 as in the above-described embodiment. On the other hand, when the first image recording unit 10 performs image recording on the paper P, the control unit 4 controls the solenoid 282 so that the photosensitive drum 21 and the transfer roller 22 are separated from each other. Specifically, in place of step S3 described above, the control unit 4 determines whether the photosensitive drum 21, the transfer roller 22, the heating roller 28a, and the pressure roller 28b are in a separated state. Run. When the photosensitive drum 21 and the transfer roller 22, and the heating roller 28a and the pressure roller 28b are in contact with each other (in the case of NO), the control unit 4 replaces the photosensitive drum 21 and the transfer roller 22 with step S4. A step of controlling the heating roller 28a and the pressure roller 28b to be in a separated state is executed. When the photosensitive drum 21 and the transfer roller 22, and the heating roller 28a and the pressure roller 28b are in the separated state (in the case of YES), the control unit 4 executes the process of step S5. Thus, even when the paper P is conveyed between the photosensitive drum 21 and the transfer roller 22 when the first image recording unit 10 performs image recording, the influence of the conveyance by the photosensitive drum 21 and the transfer roller 22 is eliminated. For this reason, the image quality recorded by the first image recording unit 10 can be maintained. Further, it is possible to suppress the ink discharged on the paper P from adhering to the photosensitive drum 21. In this other modified example, when the first image recording unit 10 records an image on the paper P, there is no need to transport the paper P via the bypass route R2, so that the switching unit 50, the bypass route R2 The guide pairs 44 and 45 and the conveying roller pair 34 constituting the above may not be provided. That is, the transport path of the transport unit 30 is configured only by the main transport path R1. That is, this modification can be combined with each of the above-described embodiments and modifications.

  As yet another modification, as shown in FIG. 8, a guide pair 341 (first guide) includes two guides 341 a that constitute a path 341 c between the conveyance roller pair 32 and the photosensitive drum 21 and the transfer roller 22. It may be composed of 341b. The path 341c is curved so as to go upward as it goes downstream in the transport direction A. The two guides 341a and 341b constitute an enlarged portion 341d in which a part of the path 341c is enlarged in the thickness direction (vertical direction) of the paper P. The guide 341a has a guide surface 341a1 that is opposed to the recording surface side of the paper P and that is curved upward toward the downstream side in the transport direction A. The guide 341b has a guide surface 341b1 that faces the surface opposite to the recording surface of the paper P and is curved upward toward the downstream side in the transport direction A. Here, when the paper P is transported along a guide that forms a curved path, the paper P is transported while contacting the outer guide by the waist of the paper P. That is, according to this configuration, when the paper P on which an image is recorded by the first image recording unit 10 is conveyed along the guide pair 341, the paper P contacts the guide surface 341b1 of the guide 341b that is an outer guide. While being conveyed. When the paper P is conveyed while being in contact with the guide surface 341b1, adhesion of ink to the guide surfaces 341a1 and 341b1 can be suppressed. In addition, since the guide surface 341b1 is in contact with the surface opposite to the recording surface of the paper P, the disturbance of the image recorded on the paper P by the first image recording unit 10 can be suppressed. On the other hand, when an image is recorded on the paper P by the second image recording unit 20, the paper P is similarly conveyed while being in contact with the guide surface 341b1 of the guide 341b. Here, since the guide surface 341b1 faces the surface opposite to the recording surface of the paper P on which the image is recorded by the first image recording unit 10, there is a possibility that ink is attached as compared with the guide surface 341a1. Less is. Therefore, ink adhesion to the paper P can be suppressed. That is, in this modification, the path 341c is curved upward as it goes downstream in the transport direction A, so that it is possible to suppress adhesion of ink to the guide pair 341. Also in this modification, the guide 341b may be configured to be rotatable between the first position and the second position.

  As described above, in the above-described embodiment, in the case where the information included in the recording command is image recording by the ink ejection method, for each sheet P corresponding to the recording command, the image is only performed by the ink ejection method. Record. On the other hand, when the information included in the recording command is not the image recording by the ink ejection method, that is, in the case of the image recording by the electrophotographic method, an image is printed only by the electrophotographic method for each paper P corresponding to the recording command. Record. The printer according to the above-described embodiment includes the first image recording unit 10 capable of recording a color image and the second image recording unit 20 capable of recording a monochrome image. Therefore, the user can select whether to perform recording in either the first image recording unit 10 or the second image recording unit 20 according to the image to be recorded on the paper P. For example, when the user wants to record an image with a color such as a color image or an image including color text, the user sets a recording command so that the recording is performed by the first image recording unit 10 and includes a monochrome image or monochrome text. When it is desired to record an image such as an image in monochrome, a recording command is set so that recording by the second image recording unit 20 is performed. In general, the first image recording unit 10 using the ink ejection method can be configured at a relatively low cost regardless of whether it is a color type or a monochrome type. However, an image recorded by the ink ejection method is more likely to bleed when the image is traced with a marker as compared to an image recorded by the electrophotographic method. If the electrophotographic second image recording unit 20 is a monochrome type, it can be configured at a relatively low cost. However, when the second image recording unit 20 is a color type, it is relatively expensive. The printer according to the above-described embodiment combines the color-type first image recording unit 10 based on the ink ejection method and the monochrome-type second image recording unit 20 based on the electrophotographic method. Either method can be selected according to the application. The ink discharge type first image recording unit 10 may be a monochrome type, and the electrophotographic second image recording unit 20 may be a color type. Further, both the first image recording unit 10 and the second image recording unit 20 may be a monochrome type or a color type.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. For example, if the conveyance speed of the paper P by the main conveyance roller pair is larger than the conveyance speed of the paper P by the photosensitive drum 21 and the transfer roller 22 when the second image recording unit 20 records an image, it is otherwise. The conveyance speed of the paper P by the main conveyance roller pair in the first image recording unit 10 and the second image recording unit 20 may be any speed. For example, in step S15, the conveyance speed by the conveyance roller pair 31 may not be V2, and the conveyance speed may be the same as V1, less than V1, or may exceed V1. Further, except when the toner image is transferred to the paper P by the photosensitive drum 21 and the transfer roller 22, the transport speed by the transport roller pair 31 may not be V2, and the transport speed is the same as V1. However, it may be less than V1 or may exceed V1. The head 11 of the first image recording unit 10 employs a serial head, but may be a line head. In this case, when the first image recording unit 10 records an image on the paper P, the paper P may be continuously transported by the main transport roller pair.

  In the above-described embodiment, the conveyance roller pair 32 may not be provided. Alternatively, the main conveyance roller pair for the first image recording unit 10 may be a conveyance roller pair 32. In this case, the conveyance roller pair 31 may not be provided. Furthermore, in the above-described embodiment, the switching unit 50, the guide pairs 44 and 45 and the conveyance roller pair 34 constituting the detour route R2 may not be provided.

  The encoders 37 and 38 may not be provided on the driving roller of the conveyance roller pair 31 and the photosensitive drum 21. Also in this case, in order to control each of the driving roller and the photosensitive drum 21 to rotate at a preset rotational speed, a detector for measuring the rotation may be provided. Further, only the motor control may be performed without providing a detector. Furthermore, the sensor 36 may not be provided. Further, the moving unit 280 may move the photosensitive drum 21 or may move both the photosensitive drum 21 and the transfer roller 22. The recording medium is not limited to the paper P, and may be various recording media.

DESCRIPTION OF SYMBOLS 1 Recording device 4 Control part 10 1st image recording part 11 Head (liquid discharge head)
14 Moving part (first moving part)
20 Second image recording unit 21 Photosensitive drum (photosensitive member)
22 Transfer roller 30 Conveying section 31 Conveying roller pair 41,341 Guide pair (first guide)
41a and 41b guides (a pair of guides)
41c, 241c Route 41d, 241d Enlarged portion 42 Guide pair (second guide)
50 switching part 51 flap 241a guide 241b guide 250 urging member 251 regulating member 280 moving part (second moving part)

Claims (5)

A transport unit that transports the recording medium along a predetermined transport path;
A first liquid ejection head including a liquid ejection head formed with a liquid ejection port and configured to eject an image from the plurality of ejection ports and record an image on a recording medium conveyed by the conveyance unit; An image recording unit;
A transfer roller disposed downstream of the first image recording unit in the transport path and sandwiching a recording medium between the photosensitive member and the photosensitive member, and a toner image carried on the photosensitive member as a recording medium A second image recording unit configured to transfer and record an image on a recording medium;
A control unit that controls the transport unit to transport the recording medium, and controls the second image recording unit to perform image recording by the second image recording unit on the recording medium,
The transport unit is disposed along the transport path upstream of the first image recording unit or between the first image recording unit and the second image recording unit, and the photosensitive member in the transport path and A conveyance roller pair disposed at a position where a separation distance from the transfer roller is less than a length along the conveyance path of the recording medium;
The transport path includes a first path for transporting a recording medium from the first image recording unit to the second image recording unit,
The transport unit has a first guide that defines the first path,
The first guide is a recording medium in which the first path is partially enlarged with respect to the thickness direction of the recording medium, and the recording medium is bent due to a speed difference of the recording medium between the pair of conveying rollers, the photosensitive member, and the transfer roller. Constitute an enlarged part that can be accommodated,
One of the pair of guides constituting the first guide is rotatable around one end along the first path, and at least a part of the first guide is at the first position. It is configured to be movable between a second position away from the other guide than the other, and in the second position, constitutes the enlarged portion,
A biasing member that biases the one guide from the second position toward the first position;
A regulating member that positions the one guide at the first position against the urging force of the urging member;
The biasing force of the biasing member is set to be smaller than the waist of the recording medium,
The control unit is configured such that the conveyance speed of the recording medium by the pair of conveyance rollers is larger than the conveyance speed of the recording medium by the photoconductor and the transfer roller when the second image recording unit records an image on the recording medium. When the first image recording unit records an image on a recording medium, the conveying unit is controlled so that the speed is lower than the conveying speed of the recording medium by the photosensitive member and the transfer roller. A recording apparatus. The first image recording unit further includes a first moving unit that reciprocates the liquid ejection head in a direction orthogonal to a direction along the conveyance path of the recording medium,
The control unit intermittently conveys the recording medium along the conveyance path, and ejects liquid from the ejection port while reciprocating the liquid ejection head in the orthogonal direction to record an image on the recording medium. The recording apparatus according to claim 1, wherein the conveying unit and the first image recording unit are controlled so as to be performed.   The said control part controls the said conveyance part so that a recording medium may be conveyed continuously, when recording an image on a recording medium in the said 2nd image recording part. Recording device. The expansion unit, a recording apparatus according to any one of claims 1 to 3, characterized in that it is arranged on the opposite side to the surface of the recording surface and the opposite side in the recording medium. A transport unit that transports the recording medium along a predetermined transport path;
A first liquid ejection head including a liquid ejection head formed with a liquid ejection port and configured to eject an image from the plurality of ejection ports and record an image on a recording medium conveyed by the conveyance unit; An image recording unit;
A transfer roller disposed downstream of the first image recording unit in the transport path and sandwiching a recording medium between the photosensitive member and the photosensitive member, and a toner image carried on the photosensitive member as a recording medium A second image recording unit configured to transfer and record an image on a recording medium;
A control unit that controls the transport unit to transport the recording medium, and controls the second image recording unit to perform image recording by the second image recording unit on the recording medium,
The conveyance path branches from the first path for conveying a recording medium from the first image recording unit to the second image recording unit, and bypasses the second image recording unit. A second path for
The transport unit is disposed along the transport path upstream of the first image recording unit or between the first image recording unit and the second image recording unit, and the photosensitive member in the transport path and A pair of conveying rollers disposed at a position where a separation distance from the transfer roller is less than a length along the conveying path of the recording medium, a first guide that defines the first path, and a second path. A second guide capable of conveying the recording medium to the second image recording unit via the first path, and a second state capable of conveying the recording medium from the first path to the second path. And a switching unit having a flap capable of taking a state,
The first guide is a recording medium in which the first path is partially enlarged with respect to the thickness direction of the recording medium, and the recording medium is bent due to a speed difference of the recording medium between the pair of conveying rollers, the photosensitive member, and the transfer roller. Constitute an enlarged part that can be accommodated,
The second path is configured to branch from the upstream side of the enlarged portion in the transport path,
The control unit causes the flap to take the first state when the second image recording unit performs image recording on the recording medium, and also performs the image recording on the recording medium by the first image recording unit. The switching unit is controlled so that the flap takes the second state, and the recording medium conveyance speed by the conveyance roller pair is determined when the second image recording unit records an image on the recording medium. A recording apparatus that controls the conveyance unit so as to be faster than a conveyance speed of a recording medium by a photosensitive member and the transfer roller.

Images