JP4990346B2 - Image forming apparatus - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus, and more particularly to an image forming apparatus in which a printing unit can be pulled out to the front side of the apparatus in consideration of maintainability of the printing unit and the printing unit can be easily replaced.

  Each part of the printing unit is attached to the frame body of the device because the structure is simple compared to a conventional image forming device using an inkjet process, that is, an image forming device that scans a laser beam and performs optical writing. When there is a need for repair of the printing unit, the entire machine is replaced or each component is replaced.

  Therefore, for example, an invention disclosed in Patent Document 1 or 2 is known as an image forming apparatus in which the printing unit can be replaced. The invention disclosed in Patent Document 1 includes at least one ink jet printing means for transferring ink from a recording engine means for applying ink to a print medium to the print medium, a service means for maintaining the integrity of the ink jet function of the recording engine means, Hard copy apparatus comprising: ink, at least one ink containing means for containing a predetermined amount of said ink, supply means for supplying ink from the ink containing means to the inkjet printing means, and electrical means for connecting power and control to the recording engine means As a selectively replaceable unit, the housing means is accommodated in an operable configuration.

  The invention disclosed in Patent Document 2 includes an inkjet head that moves relative to a recording paper, a fixed ink storage means that is an ink supply source of the inkjet head, and supplies ink in the fixed ink storage means to the inkjet head. A connecting cable for connecting the ink supply tube and drive circuit to the electrode of the inkjet head, and mounting the inkjet head and its travel means, fixed ink storage means, ink supply tube and connection cable and its connection terminal on a support member And a support replacement unit that is detachably attached to the main unit.

  As described above, when there is a need to repair the printing unit of an ink jet printer, it has been conventional to replace each machine or each component. There is a lot of waste, and when replacing each component part, since liquid ink is used, a certain amount of attention is required for the work, and there is a problem that work efficiency is poor. That is, in an ink jet printer, since it is necessary to supply ink that is a liquid to a print unit to be replaced, a mechanism for supplying ink must be connected, for example, an ink supply tube, an ink supply conduit, etc., and the print unit is replaced. In other words, after removing these conduits, it was necessary to reattach the ink supply tube to each ink supply conduit when removing the print unit and attaching the print unit. Since these operations are installed at the customer site, all of these operations have to be performed at the customer installation site.

  Since this operation includes removal of the ink supply tube, not only does it take time, but there is a risk of ink leakage, so it is necessary to clean the ink in the inkjet head (ink in the sub tank). It is necessary to pay attention to the water level difference of the main tank. Also, if ink leaks, the inside of the machine is soiled and the floor of the customer's installation section is soiled. Considering such ink leakage, the work must be carried out more carefully, and the work time becomes longer, and if the inside of the machine or the floor is soiled, it takes time and effort to clean the work, and the work efficiency is increased. There was a problem.

  In view of such points, in Patent Document 2, as described above, an ink jet head and its running means, fixed ink storage means, ink supply tube and connection cable and its connection terminal are mounted on a support member to form an exchange unit. An invention is disclosed in which a member is detachably attached to a main unit. In this attachment, an exchange unit including an inkjet head, fixed ink storage means, and the like is attached to the upper surface of the main body device from above via an attachment shaft, and is fixed by a hook on the side surface.

  Therefore, in the present invention, the ink jet head, the ink supply mechanism including the ink storage means, the connection cable, and the connection terminal can be exchanged as one unit, but the work must be performed from above, and the space above is empty. It is a condition. In addition, the sheet feeding / conveying system including the platen roller, its driving system, and the driving source of the ink jet head are provided on the apparatus main body side, and cannot be replaced as a unit. For this reason, the inkjet head, its drive system and the paper feed / conveyance system are mechanically independent, and it is difficult to make the distance and relative position between the two constant with the replacement. It was.

  Further, as disclosed in Patent Document 2, when the engine unit is detached from the main body, the electrical system between the engine unit and the main body needs to be detached. In the case of inkjet, since an inkjet head is provided with a number of nozzles and these nozzles are controlled, the number of connection pins between the inkjet unit and the main control board ranges from 100 to 200 pins. Originally, it is ideal to use a connector such as a drawer connector. However, when hundreds of pins are inserted and removed with a drawer connector, a great deal of force is required for insertion and removal. Therefore, in reality, there are virtually no connectors with several hundred pins, and in fact, the connection is divided into a large number of connectors. At that time, the position where the connector is attached / detached becomes a problem.

  For example, when it is provided on the back side of the apparatus, the work itself is started after the apparatus itself is pulled out at the time of detachment, and workability is poor. Further, there may be a configuration in which the connection portion cannot be provided on the back side depending on the device. Also, because the front side of the device performs jam processing and ink replacement, the drive unit of the device is often provided on the back side, and if a connection is provided on the front side, the connection cable is routed from the back side. Necessary and inevitably increases the length of the cable. If the cable becomes longer, the possibility of picking up noise increases, which may cause problems in print control.

  The present invention has been made in view of the situation of the prior art as described above, and an object of the present invention is to provide an image forming apparatus that can be easily maintained even when there is no space above the apparatus. There is.

  Another object of the present invention is to provide an image forming apparatus that does not require an upper space and can replace a printing unit in a space-saving manner.

  Another object of the present invention is to provide an image forming apparatus that can maintain a relative positional relationship between a printing unit and a paper transport unit and is excellent in printing accuracy.

  It is still another object of the present invention to provide an image forming apparatus excellent in workability that can easily attach and detach an electric system when detaching a printing unit.

  In order to achieve the above object, an invention according to claim 1 of the present invention is an image forming apparatus having an inkjet head for ejecting ink onto a recording medium, wherein the recording medium is placed at a position facing the inkjet head. A transport section that transports in the scanning direction, a carriage that mounts the inkjet head and moves the inkjet head in the main scanning direction substantially orthogonal to the sub-scanning direction, and a cap that prevents drying of the nozzles of the inkjet head And a maintenance unit having a wiper for wiping the nozzle surface of the inkjet head to remove ink on the nozzle surface, and the inkjet head, the carriage, and the maintenance unit are used as the integral printing unit for the main scanning Can be integrally pulled out from the main body of the apparatus, and the printing unit can be Drawn from the front surface of the main body, the maintenance unit, in the direction in which the printing unit is pulled out from the apparatus main body, and wherein said that are disposed on the printed portion so as to be disposed on the back side of the apparatus main body.

  According to a second aspect of the present invention, in the first aspect of the invention, the printing unit is integrally provided with the transport unit, and is integrated from the apparatus main body in a state where the vertical positional relationship between the carriage and the transport unit is fixed. It can be pulled out automatically.

  According to a third aspect of the invention, there is provided an ink tank according to the first aspect, wherein the ink tank is provided separately from the carriage, and supplies ink to the inkjet head mounted on the carriage via an ink supply unit. The ink tank is integrated with the printing unit, and is arranged on the front side of the printing unit so as to be arranged on the front side of the printing unit in the direction in which the printing unit is pulled out from the printing unit. The printing unit is pulled out integrally with the printing unit when the printing unit is pulled out from the apparatus main body.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the image reading unit is provided above the image forming unit including the printing unit, optically reads a document and converts it into an electrical signal, and the image reading unit. And a print unit, and a paper discharge unit that discharges the recording medium on which the image is formed.

  According to the present invention, since the printing unit can be pulled out in a direction orthogonal to the recording paper conveyance direction, maintenance can be easily performed in the pulled-out state. In addition, since the printing unit can be pulled out and removed in a direction perpendicular to the recording paper conveyance direction, an upper space is not required, and it is possible to replace the printing unit in a space-saving manner. In addition, since the printing unit includes the sub-scanning conveyance mechanism unit, it is possible to keep the relative positional relationship between the printing unit and the paper conveyance unit constant, and to provide an image forming apparatus with excellent printing accuracy. it can. In addition, since connecting means for connecting the control circuit on the printing unit side and the control unit of the apparatus main body is arranged at a position that is exposed when the side cover of the apparatus main body is opened, the electrical system can be attached or detached when the printing unit is attached or detached. Therefore, it is possible to provide an image forming apparatus excellent in workability that can be easily performed.

1 is a diagram showing a schematic configuration of an ink jet type copying apparatus as an image forming apparatus according to a first embodiment of the present invention. It is a side view of FIG. FIG. 2 is a perspective view illustrating a schematic configuration of an example of a printing unit. FIG. 6 is a side view illustrating a state where the printing unit is pulled out. It is a perspective view which shows the other example of the handle of a printing unit. FIG. 6 is a perspective view illustrating an example in which a handle of a printing unit is directly provided on a housing. It is a figure which shows the structure of the copying apparatus which concerns on the 2nd Embodiment of this invention. FIG. 8 is a perspective view showing a state in which a cover on the side surface of the main body of the copying apparatus of FIG. 7 is opened. FIG. 8 is a perspective view showing a state in which the cover on the side surface of the main body of the copying apparatus of FIG. 7 is opened and the front cover is omitted. FIG. 10 is a perspective view illustrating a state where the printing unit is pulled out from the state illustrated in FIG. 9. It is the perspective view which looked at FIG. 10 from the front side. FIG. 9 is a schematic perspective view of a printing unit showing a state of a connection connector portion of the copying apparatus shown in FIG. 8. FIG. 6 is a block diagram illustrating a control configuration of a copying apparatus according to a second embodiment of the present invention. FIG. 9 is a schematic perspective view of a printing unit showing another example of a connection connector portion of the copying apparatus shown in FIG. 8. FIG. 10 is a schematic perspective view of a printing unit showing still another example of the connection connector portion of the copying apparatus shown in FIG. 8.

  Hereinafter, several embodiments for carrying out the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a diagram showing a schematic configuration of an ink jet type copying apparatus as an image forming apparatus according to a first embodiment of the present invention, and is a diagram (front view) viewed from a direction (main scanning direction) orthogonal to a sheet conveying direction. ). The copying apparatus 1 according to the present embodiment basically includes an image forming unit 100, an image reading unit (scanner) 200, and a paper feeding unit 300. In this copying apparatus, the image forming unit 100 and the paper feeding unit 300 are provided above, and the image reading unit 200 is provided above the image forming unit 100.

  The sheet feeding unit 300 stores recording sheets (recording media) in a stacked state, and sequentially picks up the sheets from the upper surface of the recording stacked by the separation conveyance unit 301 including a pickup roller, and moves to the image forming unit 100 side. Transport.

  In this embodiment, the image reading unit 200 is configured by a book document scanner, and the image reading unit 200 is configured to read a document placed on the contact glass 201 by a CCD (photoelectric conversion element) 203 when the reading optical system 202 moves. It is.

  The image forming unit 100 includes conveyance rollers 101, 102, 103, a reverse roller 104, and a paper discharge roller 105, a printing unit 110, and an ink tank 106. As will be described later, the printing unit 110 that functions as a printing unit that prints an image on recording paper includes a printing mechanism unit 120, a sub-scanning conveyance mechanism unit 140, a maintenance mechanism unit 150, and an idle driving mechanism unit 160.

  In the copying apparatus 1 generally configured as described above, the recording sheets separated one by one from the sheet feeding unit 300 by the separation conveyance unit 301 are guided to the printing unit 110 by the conveyance roller 101, and based on the printing width of the inkjet head. The predetermined scanning amount is transported in the sub-scanning direction by the sub-scanning direction transport mechanism unit 140, and the operation of printing a predetermined number of lines is repeated. Based on the image data read by the image reading unit 200, one sheet is printed. Print on recording paper to form an image. The recording paper on which the image is formed is sent to the reverse roller 104 by the transport rollers 102 and 103, the transport direction is reversed by the reverse roller 104, and the paper is provided from the paper discharge roller 105 to the upper surface of the casing 402 of the print image forming unit 100. The paper is discharged onto a paper discharge tray 107.

  As shown in FIG. 1, the image reading unit 200 is provided above the image forming unit 100 with the paper discharge tray 107 interposed therebetween, and a space for replacing the printing unit 110 can be provided above the printing unit 110. I understand that I can't.

  2 is a right side view of FIG. 1, and FIG. 3 is a perspective view showing a schematic configuration of an example of a printing unit. In these drawings, the printing unit 110 is configured as one unit on which the printing mechanism unit 120, the sub-scanning conveyance mechanism unit 140, the maintenance mechanism unit 150, and the idle driving mechanism unit 160 are mounted. A recording paper conveyance path 111 is provided between the mechanism unit 140.

  The maintenance mechanism 150 includes mechanical caps necessary for maintaining the operation capability of the inkjet, such as a cap for preventing the nozzle of the inkjet head from drying, a wiper that wipes the nozzle surface of the inkjet head, and removes ink on the nozzle surface. It is provided on the home position side of the inkjet head. In addition, a blanking mechanism 160 is provided at the end of the home position opposite to the main scanning direction, and ink blanking is performed at the start of printing or at a preset timing in order to prevent ink clogging. Can be done. The idling mechanism unit 160 has an ejection receiver for idling ink provided at a lower portion facing the ink jet head. Since the maintenance mechanism 150 and the blanking mechanism 160 may use a known mechanism, detailed description thereof is omitted.

  As shown in FIG. 3, the printing mechanism unit 120 includes a carriage 121, a pair of guide members (not shown) that guide the carriage 121 in the main scanning direction, and a main scanning motor that moves the carriage 121 in the main scanning direction along the guide members. 122. The carriage 121 has an inkjet head having a predetermined number of ejection openings on the lower surface for each color of YMCK. Ink is supplied to the carriage 121 from the ink tank 106 shown in FIG. The main scanning motor 122 is provided on the idle driving mechanism 160 side (the front side in the drawing direction described later), and the output end of the main scanning motor 122 is connected to the carriage 121 via a timing belt. The rotation is converted into a linear motion of the carriage 121 and moved in the main scanning direction. However, it is also possible to configure the guide as one screw shaft and the main scanning motor 122 to rotationally drive the screw shaft.

  In FIG. 1, the sub-scanning conveyance mechanism unit 140 includes a sub-scanning roller 141, a platen 142, and a conveyance roller 143, and the sub-scanning roller 141 conveys the recording paper by the predetermined feed amount by a driving mechanism (not shown). Printing is performed by an ink jet head mounted on a carriage 121 that moves in the main scanning direction opposite to the head. Printing in the main scanning direction is repeated every time a predetermined amount of recording paper is fed. At that time, printing is executed in each step during the reciprocating movement.

  In the printing unit 110 shown in FIG. 3, the sub-scan transport mechanism unit 140 uses a transport belt 144, and the dimensions in the transport direction are set to be substantially the same as the dimensions of the carriage 121 in the sub-scan direction. This is because the print width of the inkjet head mounted on the carriage 121 (the number of dots in the sub-scanning direction to be printed simultaneously) is relatively large, and the flatness between them must be maintained. Therefore, an electrostatic belt that adsorbs the recording paper by electrostatic action as the conveying belt 144 or an adsorbing belt that adsorbs the recording paper by setting the air pressure on the belt to a negative pressure can be used. In addition, when the above-described sub-scanning roller 141 is used, it is necessary to ensure a desired flatness by the platen 142.

  The conveyor belt 144 moves in the sub-scanning direction by rotationally driving the belt driving shaft 146 by the sub-scanning motor 145. The sub-scanning motor 145 is attached to a side surface of the printing unit 110 on the side where the idle driving mechanism 160 is disposed (a front plate 113 on the front side in the pull-out direction described later), and drives the belt drive shaft 146 via the timing belt 147. To do. Further, a conveyance roller 143 is provided on the paper carry-in side and the paper carry-out side of the recording paper conveyance path 111 so as to face the sub-scanning roller 141, and the recording paper is separated from the paper supply unit 300 into the separation conveyance unit 301, the conveyance path roller 101, and The sheet is conveyed from between the sub-scanning roller 141 and the conveyance roller 143 to the printing area via the conveyance path 112. Note that the conveyance distance of the conveyance belt 144 can be extended from the printing area of the printing unit 110 to the downstream end in the sub-scanning, and the sub-scanning roller 141 and the conveyance roller 143 on the downstream side from the printing area can be omitted. Here, the dimension in the conveyance direction of the belt 144 is a dimension in the sub-scanning direction of a portion where the belt 144 is stretched. The print area is an area where printing is performed by an inkjet head mounted on the carriage 121 that moves in the main scanning direction.

  The printing unit 110 includes a housing 119 having a substantially rectangular parallelepiped shape. A guide for the carriage 121 and a belt drive shaft 146 are provided between the front and rear side plates 113 and 114, and the idle driving mechanism is provided inside each side plate 113 and 114. The part 160 and the maintenance mechanism part 150 are arranged. The conveying roller 143 is pivotally supported by a roller shaft provided between the opposing side plates of the idle driving mechanism portion 160 and the maintaining mechanism portion 150 so as to be idled. A pair of rails 115 extending along the direction perpendicular to the paper transport direction project from the housing 119 along the paper transport direction at the upper end of the housing 119 of the print unit 110. Handles 116 and 117 are provided on the upper side of the front side plate 113 side and the rear side plate side 114, respectively.

  The printing unit 110 generally configured as described above is pulled out from the front surface of the image forming unit 100 (copying apparatus 1) as shown in FIG. 4, and further removed from this state. Therefore, the image forming unit 100 is provided with a rail guide 109 that receives the pair of rails 115 in a direction perpendicular to the sheet conveyance direction. A positioning mechanism (not shown) is provided at a position facing the rear plate 114 of the printing unit 110 in the housing 402 of the image forming unit 100. Therefore, when the printing unit 110 is inserted to the back side along the rail guide 109, the printing unit 110 is positioned by the positioning mechanism in the final process, and the printing unit 110 is locked at that position. When pulling out the printing unit 110 from the image forming unit 100, if a force is applied in the pulling direction by holding the handle 116 on the front plate 113 side, the lock is released and the printing unit 110 can be pulled out as it is. Then, the printing unit 110 is pulled out by a predetermined amount or the maximum amount, and when the printing unit 110 reaches a position where the hand 117 is engaged with the handle 117 on the rear plate 114 side, printing is performed by holding the handle 117 with the hand that does not have the handle 116. The unit 110 can be removed. A stopper is provided to prevent the print unit 110 from being detached from the rail guide 109 before holding the handle 117 on the rear plate 114 side when the print unit 110 is pulled out. The stopper may be any means that temporarily restricts movement between the rail guide 109 and the end of the rail on the handle 117 side.

  In addition, if it is configured so that it can be pulled out, maintenance can be performed with the printing unit 110 pulled out, the image reading unit 200 is removed, and the paper discharge tray 107 that is the upper structure of the image forming unit 100 is also provided. It is not necessary to perform maintenance of the printing unit 110 by removing the printer, so that the work efficiency can be improved. Further, since the respective parts such as the printing mechanism unit 120, the sub-scanning transport mechanism unit 140, the maintenance mechanism unit 150, and the idle driving mechanism unit 160 mounted on the printing unit 110 are sufficiently exposed, workability at the time of maintenance is also good.

  The handle 116 on the front plate 113 side is attached to a part of the front plate 113 with a bolt made of a synthetic resin, and the handle 117 on the rear plate 114 side is made of a structural material of the housing 119, but is shown in FIG. As shown in FIG. 6A, the casing 119 of the printing unit 110 is integrally formed of a synthetic resin material, and the handle 116 can be formed. , 117 can also be configured with grooves 116a, 117a on which fingers can be applied. In this case, the groove is formed in a hook shape so that the finger can support the weight of the printing unit 110 as shown in FIG. 6B, which is a cross-sectional view taken along line AA in FIG. It is desirable to keep it. In addition, the handle 116 shown in FIG. 3 is formed in a groove shape at the both ends of the belt to be pressed by a bolt, and when used, the belt moves and the bolt head is caught on the end of the groove. A structure that supports a load can also be used.

In this embodiment, the rail 115 and the rail guide 109 constitute a slide mechanism that pulls out the printing unit 110. However, a guide bar and a mechanism that slides along the guide bar are provided so that the print unit 110 can be pulled out. Alternatively , the printing unit 110 can be moved on the floor by configuring the printing unit 110 to slide on the floor of the image forming unit 100. Any configuration that allows the print unit 110 to be pulled out, pushed in, and set can be the subject of the present invention.

  In the present embodiment, since the printing unit 110 can be pulled out and removed from the image forming unit 100, a cover 170 is provided in the opening for drawing out. In this embodiment, the cover 170 is configured to cover only the opening, but may be configured to cover the entire front surface of the image forming unit 100.

  With this configuration, when it becomes necessary to repair or replace any of the elements constituting the printing unit 110, the customer does not need to remove the element to be repaired or replaced. The entire printing unit 110 can be replaced and immediately ready for use. This minimizes downtime, increases work efficiency, and increases user satisfaction. When removing the printing unit 110, it is only necessary to close and remove the ink supply path that is supplied from the ink tank 106 to the carriage 121, and there is no possibility of ink leakage.

  In this embodiment, the printing unit 110 is configured as one unit on which the printing mechanism unit 120, the sub-scanning transport mechanism unit 140, the maintenance mechanism unit 150, and the idle driving mechanism unit 160 are mounted. The carriage 121 of 120, the carriage transfer mechanism, and the drive source (main scanning motor 122) of the carriage transfer mechanism are configured as one unit, or a control circuit is mounted on this unit and configured as one unit. It can also be configured to be drawable. Further, the printing mechanism unit 120 and the sub-scanning transport mechanism unit 140 excluding the maintenance mechanism unit 150 and the blanking mechanism unit 160 are configured as one unit, or a control circuit is mounted on this unit and configured as one unit. Such a unit can also be configured to be drawable.

  In addition, in an optical writing line printer or thermal transfer printer using an LED as a printing mechanism of the printing unit 110, the maintenance mechanism 150 and the idle driving mechanism 160 such as an image forming apparatus using an inkjet head are unnecessary. It is also possible to configure the image forming apparatus so that only the portions can be pulled out integrally. When the printing unit includes not only the printing mechanism but also the sub-scanning conveyance mechanism, a single circuit can be configured by further mounting a control circuit.

  Furthermore, in this embodiment, the copying apparatus 1 including the image reading unit 200 on the upper part of the image forming unit 100 is illustrated, but it goes without saying that the present invention can also be applied to a printer.

<Second Embodiment>
As described above, when removing the printing unit, it is necessary to consider not only the mechanical detachment but also the detachment of the electrical system. The second embodiment is an example of an image forming apparatus that takes into consideration the removal / attachment of an electrical system and the processing of paper jam. In the following description, the same parts as those in the first embodiment described above are denoted by the same reference numerals, and redundant descriptions are omitted.

  7 is a diagram showing the overall appearance of the copying apparatus 1 shown in FIG. 1. FIG. 7 (a) is a perspective view seen from the front, and FIG. 7 (b) is a paper jam process in the copying apparatus 1. It is a figure which shows the state which opened all the covers which can be opened in order to perform. The copying apparatus 1 is provided with a plurality of covers. These covers are the first and second transport path covers 1a and 1b on both sides of the copying apparatus 1 that can expose the transport path 112, the ink tank cover 106a on the front side of the ink tank 106, and the upper side of the ink tank 106. It is a figure which shows the state which each open | released the 3rd conveyance path cover 112a which covers this conveyance path 112, and the 4th conveyance path cover 142a which covers the platen 142. As can be seen from FIG. 7, in the copying apparatus 1 according to the present embodiment, in addition to the above-described cover 170 covering the front portion of the accommodated printing unit 110, the respective covers 1a, 1b, 106a, 112a, 142a are provided. ing. FIG. 7A shows the overall configuration including the ADF 210 mounted on the upper part of the contact glass 201. The upper surfaces of the third transport path cover 112a and the fourth transport path cover 142a function as the paper discharge tray 107. Therefore, a paper surface detection sensor 107a is provided on the upper portion of the third conveyance path cover 112a as shown in FIG.

  8 is a perspective view showing a state in which the second transport path cover 1b on the right side surface of the copying apparatus 1 is opened. FIG. 9 is a perspective view of the copying apparatus 1 with the cover 170 and the ink tank cover 106a omitted. 10 is a perspective view showing a state in which the printing unit 110 is pulled out from the state of FIG. 9, and FIG. 11 is a perspective view of the state of FIG. 10 viewed from the front. In these drawings, a connection connector portion 180 for connecting each portion of the print unit 110 and the main body control board 190 is disposed on the upper portion of the casing 119 of the print unit 110. As shown in the schematic diagram of FIG. 12, the connection connector portion 180 is provided on the side surface of the housing 119 so as to be parallel to the side surface of the copying apparatus 1. As will be described later, in this embodiment, the connection connector unit 180 is composed of first and second substrates 180a and 180b, and the connection function is distributed between them. In FIG. 12, the substrate in claim 13 corresponds to the first substrate 180 a and the second substrate 180 b of the connection connector portion 180. In this embodiment, the conveyance guide plate 144a is provided on the outer periphery of the conveyance belt 144, and the conveyance belt 144a is configured not to be directly exposed to the outside. As can be seen from FIG. 11, an encoder system 144b for detecting the amount of rotation of the sub-scanning motor 145 that drives the conveying belt 144 is provided on the front side of the printing unit 110. This encoder system 144b obtains a driving force from the rotating shaft 145a of the sub-scanning motor 145 by an encoder sensor (not shown), counts the number of pulses of the rotating encoder, converts the number of rotations, and converts the sheet feed amount in the sub-scanning direction. To detect.

  In FIG. 12, the first substrate 180a side is connected to the engine side including the connector 181a for connecting to the control substrate 190 of the copying machine 1 main body, the carriage 121, the maintenance mechanism portion 150, and the idle driving mechanism portion 160. Connectors 181b, 181c, 181d, and a connector 181e for connecting to the second substrate 180b are provided. These connectors 181a, 181b, 181c, 181d, and 181e are arranged so that the respective connection cables do not cross each other, and consideration is given so as not to pick up noise. A signal for controlling the main scanning direction moving mechanism of the sub-scanning transport mechanism 140 and the carriage 121 is input to and output from the second substrate 180b via the connector 181f.

  In the schematic diagram of FIG. 12, the connection connector portion 180a is provided along substantially the entire length of the side surface of the printing unit 110. However, in the actual machine, as shown in FIG. Therefore, the lengths of the connection cables 187a to 187e between the respective mechanisms such as the printing mechanism portion 120 of the printing unit 110 and the connection connector portion 180a are the shortest. Further, the connector 181 a is provided at a position closest to the rear plate 114 side in the connection connector portion 180, that is, a position closest to the main body control board 190. Therefore, the connector 181a is provided at a position where the length of the signal line 400 connected to the connector 191 on the main body control board 190 side is as short as possible. When the connection connector portion 180 is thus provided on the side surface of the printing unit 110 facing the second cover 1b, the second cover 1b is opened and the connector connected to the connection connector portion 180 is removed. As a result, the electrical connection between the printing unit 110 and the main body control board 190 is cut off, and the connector 191 of the main body control board 190 is mechanically separated from the printing unit 110. Therefore, the printing unit 110 can be easily detached from the copying machine 1 main body. Therefore, in the embodiment shown in FIG. 12, the length of each of the connection cables 187a to 187e is the shortest, so that noise picked up from the cables can be reduced. Further, since the signal line 400 is short when the connector 191 on the control board 190 side is removed from the connection connector portion 180, the signal line does not get in the way when the printing unit 110 is removed from the copying apparatus 1 main body. In addition, the connection means in Claim 12 respond | corresponds to the connectors 181a-181f shown in FIG. Connection cables 187b to 187d from the respective mechanisms of the printing unit 110 are connected to connectors 181b to 181d arranged on the front side of the first substrate 180a, and the back surface of the first substrate 180a is connected to the connector 181a and others. A wiring pattern for electrically connecting the connectors 181b to 181d is formed. As a result, a signal input from the signal line 400 via the connector 181a is output to each mechanism of the print unit via the connectors 181b to 181d and the connection cables 187b to 187d.

  Here, a control configuration of the copying apparatus 1 according to the present embodiment is shown in a block diagram of FIG. As shown in FIG. 13, the control circuit of the copying apparatus includes a main body control board 190, an image reading unit (scanner) 200, a paper feeding unit 300, a controller (CTL) board 192, a power supply unit (PSU) 193, a driver board 194, SD. A card board 195, an option board (OPU board) 196, and a printing unit 110 are included.

  In the form up to FIG. 12, the connection connector portion 180 is constituted by the first substrate 180a and the second substrate 180b. On the other hand, in the connector board 197a shown in FIG. 13, the connection connector portion 180 is composed of a single substrate. In the case of FIG. 13, the connector 181f of the second board 180b is attached to the connector board 197a.

  On the control board, a control unit including a CPU, a ROM and a RAM, drivers for driving parts such as a pump and a motor, I / O, and other control elements used for control are mounted.

  The image reading unit 200 includes at least a scanner board unit (SBU) 200a including a CCD and an SBUASIC, a lighting device 200b, various sensors 200c such as an HP sensor, an APS sensor, and a pressure plate opening / closing sensor, and a detection signal with the control board 190. And input / output of control signals. The CTL board includes a GWASIC, controls display of the operation display unit and input / output control, and inputs / outputs signals to / from the control board 190.

  The paper feeding unit 300 includes sensors (various detection parts) 300a and driving parts 300b such as clutches, solenoids, and motors for paper feeding, and the control board 190 receives detection signals from the sensors 300a, and the driving parts. A drive signal is transmitted to 300b. The sensors 300a include, for example, a registration sensor, a relay sensor, a size detection sensor, a paper presence / absence sensor, a cover open sensor, and the like, and the driving component 300b includes a transport roller 101, 102, 103, 143, a discharge roller 105, A motor, a clutch, and the like that drive the sub-scanning roller 151 and the sheet feeding roller of the separation sheet feeding unit 301 are included.

  The power supply unit 193 functions as a power supply unit to each unit including the control circuit. The driver board 194 includes a piezo thermistor, executes ejection control of each color inkjet head mounted on the printing unit 110, and is connected to the control board 190 and the printing unit 170. In addition, an SD card board 195 and an OPU board 196 are connected to the control board 190, so that a version upgrade of a program using an SD card and a new program can be installed. The OPU board 196 can be used when an option is connected.

  The printing unit 170 is mounted on the printing unit 110 and has a connector board 197a functioning as a connection connector unit 180, a common (COM) board 197b, various sensors 197c related to an inkjet head connected to the COM board 197b, and each color. An ink-jet head 197d, various sensors 197e other than those related to the ink-jet head, a sub-scanning encoder 188, and a driving component 197f such as a clutch and a solenoid are provided. In this embodiment, since five color ink-jet heads are provided, five types of sensors 197e and drive parts 197f having the same configuration are provided. The various sensors 197c related to the ink jet head include, for example, a head environmental temperature sensor, an image registration sensor, an air detection sensor provided for each head, and the like. Various sensors 197e other than those related to the inkjet head are sensors such as a rotary encoder sensor in the sub-scanning direction, a carriage raising sensor, and a cartridge presence / absence detection sensor. A driving component 197f is a sheet passing number counter, various clutches, a motor, and the like. Including.

  The connector board 197a corresponds to the connection connector unit 180 in the present embodiment, and the connector board 197a controls the control board 190 and the driver board 194 side, the COM board 197b on the printing unit 170 side, various sensors, and various driving components. Connecting. In the figure, a thick line or a white line and an arrow are shown, but in this embodiment, there are 75 lines between the COM board 197b and the connector board 197a, and 6 lines from the main scanning encoder 188 to the connector board 197a. 55 signal lines are connected from the various sensors 197e to the connector board 197a side, and 32 signal lines are connected from the connector board 197a to the various drive parts 197f side. The total of these is close to 170, and when signal lines for transmitting / receiving signals to / from the maintenance mechanism unit 150 and the blanking mechanism unit 160 are inserted, the number is about 200, and a connector is required for each signal line.

  Therefore, in the present embodiment, the connectors are distributed according to function on the connector board 197a as shown in FIG. 12, and the distributed connectors 181a, 181b, 181c, and 181d are connected to the signal line 400 from the control board 190. I made it. Signal lines from various parts of the printing unit are connected to the back side of the connector board 197a, that is, the non-attached side of the connectors 181a, 181b, 181c, 181d, and the control board 190 is connected to the connectors 181a, 181b, 181c, 181d. When the signal line 400 from the side is connected, the COM board 197b, the various sensors 197e, and the driving components 197f are connected. As a result, when the printing unit 110 is pulled out and removed from the copying apparatus 1 main body, if the connection of the 181a, 181b, 181c, and 181d is released, the printing unit 110 and the control board 190 side can be physically and electrically connected. Is disconnected, and the printing unit 110 can be removed from the copying machine 1 main body.

  Note that the connector 181f is provided on the second substrate 180b, and signals for controlling the sub-scanning transport mechanism 140 and the main scanning direction moving mechanism of the carriage 121 are input / output as described above. Thereby, if the connector 181f is removed at the time of exchanging the mechanism portion, the exchanging is possible regardless of other parts. In this embodiment, the connection connector portion 180 corresponding to the connector board 197a is divided into two parts, a first board 180a and a second board 180b, and the connector 181e connects the first board 180a and the second board 180b. By reducing the manufacturing cost and noise. However, it goes without saying that the connection connector portion 180 may be constituted by a single substrate. Moreover, the connection connector part 180 can also be comprised by 3 or more board | substrates.

  In this embodiment, as shown in FIG. 11, the handle 117b on the back side that is gripped when the printing unit 110 is removed is configured by a belt made of a synthetic resin material, and the handle 116b on the front side is a bottom portion on the front side of the printing unit 110. It is comprised from the recessed part provided in. When the printing unit 110 is in a normal use state, the handle 117b on the back side is retracted in a state in which the tip is fastened with a pin 117c along a frame extending in a direction orthogonal to the paper transport direction as shown in FIG. Yes. Therefore, when removing the printing unit 110, the belt-like handle 117b is removed from the pin 117c and bent in a direction perpendicular to the frame as shown by a dashed line in the figure, and the tip is fixed to the fixing bracket 117d. To make it grippable. As a result, the front handle 116b made of the concave portion and the rear handle 117b made of the belt can be gripped and easily lifted. Therefore, after the printing unit 110 is pulled out to a predetermined position, it can be easily removed.

  Further, as shown in FIG. 11, the ink tank 106 is integrated with the printing unit 110 on the left front side of the printing unit 110 when viewed from the front of the copying apparatus 1. For example, the ink tank 106 and the printing unit 110 may be integrated by screwing the printing unit 110 and a member (not shown) extending from the ink tank 106 toward the printing unit 110. Therefore, as shown in FIG. 11, when the printing unit 110 is pulled out to the front side, the ink tank 106 is also pulled out together with the printing unit 110 and removed from the main body of the copying apparatus 1.

  Since the ink tank 106 is formed integrally with the printing unit 110, when removing the printing unit 110 from the copying apparatus 1, it is necessary to remove from the printing unit 110 an ink supply path for supplying ink from the ink tank 106 to the printing unit 110. There is no. For this reason, when the printing unit 110 is removed from the copying apparatus 1, there is no possibility of ink leaking from the ink supply path, so that the printing unit 110 can be easily removed from the copying apparatus 1. When the printing unit 110 is pulled out, the ink tank (main tank) 106 is also pulled out integrally, so that the ink can be easily replaced.

  In this embodiment, unlike the first embodiment, as shown in FIGS. 9 and 10, the printing unit 110 is supported by the rail guide 109a of the copying apparatus 1 body by the lower rail 115a and can be pulled out. . This eliminates the need for the upper rail guide 109 as in the first embodiment described above, increases the degree of freedom of the space above the printing unit 110, and ensures a large working space. As shown in FIG. 7B, the jam processing is performed by opening the cover 112a on the upper side of the transport path 112 of the ink tank 106 and the cover 142a that covers the platen 142. In this case, in the first embodiment, the jam processing is performed. There is a possibility that the rail guide 109 becomes an obstacle during the jam processing. However, in the second embodiment, since there is no upper rail guide 109, there is nothing that obstructs the space between the print unit 110 side and the housing 402 of the image forming unit 100 as shown in FIG. Becomes easy.

  Other parts that are not particularly described are configured in the same manner as the first embodiment and function in the same manner.

  In this embodiment, the connector board 197a is used as the connection connector portion 180. For example, as shown in FIG. 14, a panel having terminals to which the components of the printing unit 110 are connected to the side surface of the printing unit 110. A plurality of mounts 182 may be provided according to function, and a connector 183 connected to the signal line 400 from the control board 190 side may be connected to the panel mount 182. In this case, the positions and numbers of the panel mount 182 and the connector pins may be set in association with each other to prevent erroneous connection.

  As shown in FIG. 15, a printed circuit board 184 and a plurality of connectors 185a, 185b,... Are provided on the printed circuit board as functions of the connector 180, and the ends of signal lines 400a, 400b,. May be connected to the connectors 185a, 185b, respectively. Also in this case, it is desirable to set the positions and the number of pins of the connector in association with each other so as to prevent erroneous connection. The substrate in claim 13 corresponds to the panel mount 182 in FIG. 14, and corresponds to the printed circuit board 184 in FIG.

  Further, in the first embodiment, the ink tanks 106 are provided for four colors of YMCK as shown in FIGS. 1 and 3, and in the second embodiment, the ink tanks 106 of YMCK are shown in FIGS. Five colors are provided. Accordingly, four ink-jet heads are provided in the first embodiment, and five ink-jet heads are provided in the second embodiment. The number of ink tanks and inkjet heads is set as appropriate according to the application of the printer and PPM. For example, ink tanks are provided for four colors of YMCK, and ink is supplied from one black ink tank to two black inkjet heads. It can also be configured to guide. In this case, the inkjet heads are provided for five colors of YMCKK.

DESCRIPTION OF SYMBOLS 1 Copy apparatus 1a, 1b, 112a, 142a Conveyance path cover 100 Image forming part 106 Ink tank 106a Ink tank cover 109, 109a Rail guide 110 Printing unit 115, 115a Rail 116, 117, 117b Handle 116a, 116b, 117a Groove 113, 114 Side plate 119 Housing 120 Printing mechanism section 121 Carriage 122 Main scanning motor 140 Sub-scanning transport mechanism section 141 Sub-scanning roller 144 Conveying belt 145 Sub-scanning motor 146 Belt drive shaft 150 Maintenance mechanism section 160 Immersion mechanism section 180 Connection connector section 180a First board 180b Second board 181a, 181b, 181c, 181d, 181e, 181f, 185a, 185b, 186a, 186b Connector 182 Panel mount 1 4 PCB 190 control board 194 driver board 197 IJ module section 197a connector board 200 image reading unit 300 paper feed unit

Japanese translation of PCT publication No. 2002-506758 Japanese Patent No. 3167486

Claims (4)

An image forming apparatus having an inkjet head for discharging ink onto a recording medium,
A carriage that carries the recording medium in the sub-scanning direction at a position facing the ink-jet head and the ink-jet head, and moves the ink-jet head in the main scanning direction substantially perpendicular to the sub-scanning direction A cap for preventing drying of the nozzles of the inkjet head, and a maintenance unit having a wiper for wiping the nozzle surface of the inkjet head to remove ink on the nozzle surface,
The inkjet head, the carriage, and the maintenance unit can be integrally pulled out from the apparatus main body in the main scanning direction as an integral printing part, and the printing part is pulled out from the front surface of the apparatus main body,
The image forming apparatus according to claim 1, wherein the maintaining unit is disposed in the printing unit so as to be disposed on a back side of the apparatus main body in a direction in which the printing unit is pulled out from the apparatus main body. The printing unit, according to claim 1, wherein with integrally provided with a transport unit, and wherein the upper and lower positional relationship between the carriage and the conveyance unit be integrally pulled out from the apparatus main body in a state of being fixed The image forming apparatus described . The ink tank is provided separately from the carriage and has an ink tank for supplying ink to the inkjet head mounted on the carriage via an ink supply unit.
The ink tank is integrated with the printing unit and arranged on the front side of the printing unit so as to be arranged on the front side of the device main body in a direction in which the printing unit is pulled out from the device main body. The image forming apparatus according to claim 1, wherein the printing unit is pulled out integrally with the printing unit when the printing unit is pulled out from the apparatus main body.   An image reading unit that is provided above the image forming unit including the printing unit, is provided between the image reading unit and the printing unit, and an image reading unit that optically reads a document and converts it into an electrical signal. The image forming apparatus according to claim 1, further comprising: a paper discharge unit that discharges the formed recording medium.

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