Abstract:
Disclosed is a recording apparatus that includes a conveying device for conveying a recording sheet in a conveying direction, a recording device confronting the conveying device for recording an image on the sheet being conveyed and a supporting device for shiftably supporting at least one of the conveying device and the recording device for movement between a recording position where the conveying device and the recording device are in parallel contact with the recording sheet therebetween and a non-recording or separated position where the conveying device is separated from the recording device. In one embodiment, the recording device and the conveying device are separated in parallel in the non-recording position and the supporting device causes the at least one of the conveying device and the recording device to be non-parallel during movement from the non-recording position to the recording position. In another embodiment, during movement of the conveying device from the separated position to the recording position, the supporting device first causes a first end of the conveying device to obliquely shift towards the recording device and thereafter, causes a second end of the conveying device to shift toward the recording device.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a recording apparatus used as an output device for a facsimile, copying machine, printer, a composite machine combining such machines, or a work station. 
     2. Related Background Art 
     Recently, output apparatus equipment such as facsimiles, copying machines, printers and the like have widely been popularized. In such recording apparatuses, particularly, in a recording apparatus using a cut sheet, there is provided a sheet conveying means wherein a cut sheet is supplied from a sheet supply portion to an image recording portion and then is conveyed from the recording portion to a sheet ejecting portion. 
     For example, U.S. Pat. No. 4,887,101 discloses recording apparatus wherein a cut sheet is conveyed by moving an endless belt attracting or absorbing the sheet thereon and an image is recorded on the sheet by a transfer drum disposed in confronting relation to the endless belt. When the sheet is jammed in a sheet feeding path resulting in stopping of the apparatus with the sheet remaining on the endless belt (this condition is called as &#34;jam condition&#34; hereinafter), a conveying unit including the endless belt is lowered to provide a space for facilitating an operation for removing the jammed sheet (this operation is called as &#34;jam treatment&#34; hereinafter) between the endless belt and the transfer drum. 
     In such a recording apparatus, when the conveying unit is moved from the lowered position to a recordable position, the conveying unit pushes up air remaining between the conveying unit and the transfer drum, thus creating an air flow. Since the conveying unit is lifted in parallel with the transfer drum, this air flow strikes against the transfer drum directly. Consequently, the dirt, dust, paper powder and the like entrained in the air flow will adhere to the transfer, drum, thus damaging the surface of the drum and/or adversely affecting the image formed on the drum. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a recording apparatus which can provide a wide space for the jam treatment between a conveying unit and a recording means by shifting the conveying unit. 
     Another object of the present invention is to provide a recording apparatus which prevents an air flow created by the returning movement of the conveying unit from adversely affecting the recording means. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIGS. 1A to 1D are explanatory views for explaining an operation of a support releasing mechanism; 
     FIG. 2 is an elevational sectional view of a recording apparatus according to a preferred embodiment of the present invention, including the support releasing mechanism; 
     FIG. 3 is a fragmental perspective view of an ink jet recording head; 
     FIGS. 4A to 4G are explanatory views for explaining a principle of a bubble jet recording process; 
     FIGS. 5A to 5C are explanatory views for explaining an operation of a support releasing mechanism according to a second embodiment of the present invention; and 
     FIGS. 6A to 6E are explanatory views for explaining an operation of a support releasing mechanism according to a third embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     First of all, a whole construction of a recording apparatus will be explained with reference to FIG. 2. 
     A scanner portion 1 is installed on a frame A of a recording apparatus. The recording apparatus includes an ink jet image recording means 2 activated in response to a signal from the scanner portion 1 to record image information, a belt conveying portion (conveying means) 4 for conveying a cut sheet (recording medium) 3 to the image recording means 2, and an absorbing roller 5. 
     The scanner portion 1 serves to scan an original B and comprises a light source 1a for illuminating light onto the original B resting on a platen C, a photoelectric converter element 1b such as a CCD for receiving the light reflected from the original B, and a short-focus image focusing lens 1c for focusing the light image on the photoelectric converter element 1b. 
     The belt conveying portion 4 is mounted within the frame A of the recording apparatus in such a manner that it can be shifted toward and away from the image recording means 2 by means of a support releasing mechanism (support releasing means) 6 shown in FIGS. 1A to 1C. During the recording operation, the belt conveying portion 4 is held to be spaced apart from the image recording means 2 by a distance of 1 mm or less. 
     At a lower portion of the recording apparatus, a cassette 7 containing the cut sheets 3 in a stacked condition is removably mounted within the apparatus frame A, and there is arranged a sheet supplying portion 8 comprising a separating roller 8a for separating the cut sheet 3 from the sheet stack in the cassette 7 one by one, conveying rollers 8b for conveying the cut sheet separated by the separating roller 8a toward the belt conveying portion 4 and the like. 
     Upon a recording operation, the image recording means 2 is shifted from a waiting position shown by the phantom line in FIG. 2 to a recording position shown by the solid line. 
     Further, the scanner portion 1 scans the original B to read the image information on the original B, converts the image information into an electric signal, and sends it to the image recording means 2 as a drive signal. On the other hand, the cut sheet 3 separated by the separating roller 8a is supplied from the sheet supplying portion 8 to the belt conveying portion 4. 
     The cut sheet 3 passes between the absorbing roller 5 and the belt conveying portion 4, and then passes below the image recording means 2 while being absorbed by the belt conveying portion 4, where the image information is recorded on the cut sheet by discharging ink from the image recording means 2. Thereafter, the cut sheet 3 is ejected onto a ejector tray 11 disposed externally of the apparatus frame A by means of ejecting rollers 10 through a fixing and ejecting portion 9. 
     Incidentally, as shown in FIG. 2, a recovery cap portion 12 serves to act on the image recording means 2 when the latter is positioned in the waiting position, thereby preventing the non-discharge of ink from the image recording means, whereby the image recording means 2 is always maintained in a recordable condition. 
     Next, the concrete construction of the image recording means 2, belt conveying portion 4 and support releasing means 6 will be described. 
     Image Recording Means 
     The image recording means 2 preferably comprises a plurality of recording heads of ink jet recording type as shown in FIG. 2. Preferably, four recording heads 2a, 2b, 2c and 2d regarding black color ink, yellow color ink, magenta color ink and cyan color ink, respectively, are provided to permit color recording. 
     Each ink jet recording head includes ink discharge openings for discharging the recording ink liquid as ink droplets, liquid passages communicated with the corresponding discharge openings, and discharge energy generating means for applying discharge energy to the ink liquid in the respective liquid passages to form the droplets. By selectively energizing the discharge energy generating means in response to the image signal, the ink droplets are discharged to form the image on the cut sheet. 
     The discharge energy generating means may be, for example, a pressure energy generating means using electrical/mechanical converter elements such as piezo electric elements, an electromagnetic energy generating means for generating the droplets by applying an electromagnetic wave such as a laser to the ink liquid, or a thermal energy generating means using electrical/thermal converter elements. Among them, the thermal energy generating means using electrical/thermal converter elements is most preferable since the discharge openings can be arranged with high density and the recording head can be made compact. 
     In the illustrated embodiment, bubble jet recording heads of line-type which are one type of the ink jet recording heads are used as the image recording means. 
     FIG. 3 shows a construction of the recording head 2a and FIGS. 4A to 4G show a principle of the bubble jet recording process. Incidentally, the recording heads 2b, 2c and 2d each have the same construction as that of the recording head 2a. 
     In FIG. 3, electrical/thermal converters (discharge heaters) 20b are formed on a silicon substrate 20a by a semi-conductor process such as etching, depositing, sputtering or the like, and electrodes 20c made of aluminum which supply electric power to the electrical/thermal converters are formed by a film forming process. The recording head 2a is completed by adhering a top plate 20f having partition walls 20e for defining recording liquid passages (nozzles) 20d to the substrate 20a so constructed. Further, an ink cartridge (not shown) for supplying the ink to the recording head 2a is removably mounted on the apparatus in place. 
     The ink supplied from the ink cartridge to the recording head 2a via a liquid supply tube 20g is directed to a common liquid chamber 20i in the head 2a through a connector 20h formed on the top plate 20f and then is sent to the nozzles 20d from the common liquid chamber 20i. The nozzles 20d are arranged along a whole width of the cut sheet 3 and have ink discharge openings 20d 1 , respectively, which are disposed at a predetermined pitch (for example, with a density of 16 nozzle/mm) along a sheet feeding direction in confronting relation to the cut sheet 3. In this way, the multi-nozzle bubble jet recording head 2a having the discharge openings 20d 1  arranged across the whole recordable width of the sheet is obtained. 
     Now, a principle for forming a droplet in the bubble jet recording process will be explained with reference to FIGS. 4A to 4G. 
     In the steady-state, as shown in FIG. 4A, a tension force of the ink D filled in the nozzle 20d is equalized with the external force at a discharge opening surface. In this condition, when the ink droplet is desired to be emitted, the electrical/thermal converter 20b disposed in the nozzle 20d is energized to abruptly increase the temperature of the ink in the nozzle 20d exceeding the nucleate boiling temperature. Consequently, as shown in FIG. 4B, the ink portion adjacent to the electric/thermal converter 20b is heated to create a fine bubble Da, and then the heated ink portion D is vaporized to generate film boiling, thus growing the bubble quickly, as shown in FIG. 4C. 
     When the bubble Da is grown to the maximum extent as shown in FIG. 4D, the ink droplet is pushed out of the discharge opening of the nozzle 20d. When the electrical/thermal converter 20b is disenergized, as shown in FIG. 4E, the grown bubble Da is cooled by the ink in the nozzle 20d to contract. Thus, with the growth and contraction of the bubble, the ink droplet is discharged from the discharge opening. Further, as shown in FIG. 4F, the ink contacting the surface of the electrical/thermal converter 20b is quickly cooled, thus diminishing the bubble or reducing the volume of a bubble to the negligible extent. When the bubble is diminished, as shown in FIG. 4G, the ink is replenished in the nozzle 20d from the common liquid chamber 20g by a capillary phenomenon, thus preparing the next formation of the ink droplet. 
     Accordingly, by selectively energizing the electrical/thermal converters 20b in response to the image signal, the ink image can be recorded on the sheet. 
     Belt Conveying Portion 
     As shown in FIGS. 1A to 1C, the belt conveying portion 4 is constituted by an endless belt 4e entrained around a driving roller 4a and guide rollers 4b, 4c, 4d which are rotatably supported on a frame (not shown). A platen 4f acting as a planar member for supporting the endless belt 4e in parallel with the image recording means 2 is disposed in contact with the belt portion which is disposed between the driving roller 4a and the guide roller 4b in confronting relation to the image recording means 2. 
     Upon the recording operation, by rotatingly driving the driving roller 4a, the endless belt 4e is rotated in a direction shown by the arrow a in FIG. 1C to convey the cut sheet 3 in the same direction in synchronism with the recording operation of the image recording means 2. After the recording, the cut sheet 3 is sent to the fixing and ejecting portion 9. The endless belt 4e is charged by a charger 4g (FIG. 2) so that the cut sheet is electrostatically absorbed by the charged endless belt 4e. The absorbing roller 5 presses the cut sheet against the endless belt 4e so that the whole surface of the cut sheet is absorbed by the endless belt 4e. 
     Support Releasing Mechanism 
     As shown in FIGS. 1A to 1C, the support releasing mechanism 6 serves to shift the belt conveying portion 4 between a lifted image recording position where the belt conveying portion is spaced apart from the image recording means 2 by a distance of about 1 mm or less, and a lowered releasing position where the belt conveying portion is spaced far away from the recording means. In these positions, the belt conveying portion 4 is maintained substantially in parallel with the image recording means 2. When the belt conveying portion 4 is shifted between the image recording position and the releasing position, the belt conveying portion is inclined. To this end, the support releasing mechanism comprises a support arm 6a for connecting the belt conveying portion 4 to the frame (not shown) of the recording apparatus A, and a lifter mechanism 6b for lifting the support arm 6a and the belt conveying portion 4. 
     The support arm 6a has one end pivotally connected to the frame (not shown) of the recording apparatus A via a pivot pin 6a 1  and the other end pivotally connected to a shaft 6a of the driving roller 4a of the belt conveying portion 4. 
     The lifter mechanism 6 comprises a pair of left and right link members 6b 3 , 6b 4  having lower ends pivotally connected to the frame (not shown) of the recording apparatus A via pivot pins 6b 1 , 6b 2 , respectively, and a connecting link 6b 5  connecting the left and right link members 6b 3 , 6b 4  to each other at their intermediate portions. A guide roller 6c rotatingly contacting with a curved surface 6a 3  formed on a bottom surface of the support arm 6a is rotatably mounted on an upper end of the left link member 6b 3  and a guide roller 6d rotatingly contacting with a lower surface of the platen 4f is rotatably mounted on an upper end of the right link member 6b 4 . 
     When the support releasing mechanism 6 shifts the belt conveying portion 4 from the releasing position (FIG. 1A) to the image recording position (FIG. 1C) by means of its support arm 6a and lift mechanism 6b, a downstream portion (left portion in FIGS. 1A to 1C) of the belt conveying portion 4 is first lifted and then an upstream portion (right portion in FIGS. 1A to 1C) of the belt conveying portion is lifted. When the belt conveying portion is shifted from the image recording position to the releasing position, the upstream portion of the belt conveying portion is lowered first and then the downstream portion is lowered. 
     Incidentally, a lever (not shown) for swinging the right link member 6b 4  is fixedly mounted on the pin 6b 2  formed on the lower end of the right link member 6b 4  so that this right link member 6b 4  can be rocked around the pin 6b 2  through the lever. Further, the guide rollers 6c and 6d are biased to be always urged against the lower surfaces of the support arm 6a and of the platen 4f, respectively, by means of springs (not shown). 
     The left and right link members 6b 3 , 6b 4  are constituted by two members 6b 6 , 6b 7  and two members 6b 8 , 6b 9 , respectively, which members are connected to each other by pins 6b 10 , 6b 11 , respectively. The members 6b 6 , 6b 7  and 6b 8 , 6b 9  are expandably and foldably interconnected to each other and are normally held in the expanded condition by the springs (not shown), respectively, so that the guide rollers 6c and 6d are urged against the lower surfaces of the support arm 6a and of the platen 4f, respectively. 
     Next, the operation of the support releasing mechanism according to the first embodiment will be explained with reference to FIGS. 1A to 1C. 
     As shown in FIG. 1A, in the releasing position where the belt conveying portion 4 is lowered to be spaced apart from the image recording means 2, when the the right link member 6b 4  is rotated around the pin 6b 2  in a direction shown by the arrow a by manipulating a lever (not shown), the left link member 6b 3  is also rotated around the pin 6b 1  in the same direction through the connecting link 6b 5 . Further, the support arm 6a is rotated around the pin 6b 1  in a direction shown by the arrow c through the left link member 6b 3 , thus lifting the belt conveying portion 4. 
     FIG. 1B shows a condition that the belt conveying portion 4 is being lifted. As shown in FIG. 1B, first of all, the downstream portion (left portion) of the belt conveying portion 4 is lifted by the left link member 6b 3  and the support arm 6a, and then the upstream portion (right portion) of the belt conveying portion 4 is lifted by the right link member 6b 4 , until the support arm 6a is abutted against a stopper (not shown) formed on the recording apparatus A. 
     In this case, a maximum inclined angle 0 between the flat portion of the belt conveying portion 4 and the flat portion of the image recording portion 2 is selected to have a value of 2°˜60°, preferably 2°˜30°. Now, if this angle is smaller than 2°, the air will be pushed up toward the image recording means 2 by the belt conveying portion 4, thus clogging the ink discharge openings 20d l  with dirt, dust and the like; whereas, if the angle is larger than 60°, the lifting operation will be difficult. 
     When the right link member 6b 4  is rotated around the pin 6b 2  in a direction shown by the arrow a from the condition shown in FIG. 1B by further manipulating the lever (not shown), the right link member 6b 4  is cocked uprightly. On the other hand, the support arm 6a is abutted against the stopper (not shown) of the apparatus, thus preventing further rotation of the support arm. As a result, the guide roller 6c rolls on and shifts along the curved surface 6a 3  of the support arm 6a, thus rotating the left link member 6b 3  in the direction a to cock the latter. 
     Thereby, the belt conveying portion 4 is rotated around the driving roller 4a in a direction shown by the arrow d in FIG. 1B to approach the image recording means 2, with the result that the belt conveying portion 4 is brought into the recording position where it is held parallel with and in the vicinity of the image recording means 2, as shown in FIG. 1C. 
     On the other hand, when the belt conveying portion is shifted from the recording position shown in FIG. 1C to the releasing position, the reverse operation may be effected. In this case, the upstream portion of the belt conveying portion 4 is first lowered, and, when the condition as shown in FIG. 1B is reached, the downstream portion is also lowered until the belt conveying portion is spaced apart far from the image recording means 2 in parallel therewith as shown in FIG. 1A. 
     According to the first embodiment of the present invention, in the releasing position, since the belt conveying portion 4 is spaced apart from the image recording means 2 in parallel therewith as shown in FIG. 1A, it is possible to provide a uniform space between these elements. 
     Further, when the belt conveying portion is shifted from the releasing position to the image recording position, since the belt conveying portion 4 is approaching the image recording means 2 in the inclined fashion as shown in FIG. 1B, the air between them flows to the right as shown by the arrows in FIG. 1B, thus avoiding the danger that the ink discharge openings 20d l  are clogged with dirt, dust, paper powder and the like during the lifting of the belt conveying portion 4. Further, since the percentage of the weight of the belt conveying portion 4 acting on the support releasing mechanism 6 is smaller than that in the case where the belt conveying portion 4 is lifted while keeping the parallelism between the belt conveying portion and the image recording means, there is no need to provide a driving source, a bumper mechanism and the like, thus simplifying the construction of the apparatus. 
     Furthermore, when the belt conveying portion 4 is shifted from the image recording position to the releasing position, since the upstream portion of the belt conveying portion 4 is first released, it is not necessary to release all of the belt conveying portion 4 when such a relatively slight jam condition occurs such as when a curled leading end of the cut sheet 3 is abutted against the head portion of the image recording means 2 to deviate from the belt conveying portion 4, thus performing the jam treatment effectively. 
     Next, a second embodiment of the present invention will be explained. 
     FIGS. 5A to 5C show a support releasing mechanism 6 according to another embodiment. Incidentally, the elements in FIGS. 5A to 5C the same as those shown in FIGS. 1A to 1C are designated by the same reference numerals and a detailed explanation of those elements will be omitted. 
     The second embodiment differs from the aforementioned first embodiment in the points that the connecting link 6b 5  interconnecting the left link member 6b 3  and the right link member 6b 4  is omitted and that a lever (not shown) is also provided on the left link member 6b 3  so that the left link member 6b 3  and the right link member 6b 4  can be rotated independently. 
     With this arrangement, either the left or right link member 6b 3  or 6b 4  can be firstly rotated in the upright condition prior to the rotation of the other link member; accordingly, for example, as shown in FIG. 5B, the upstream portion of the belt conveying portion 4 can be first cocked first and then the downstream portion can be cocked. Further, similar to the aforementioned first embodiment, the downstream portion of the belt conveying portion 4 may be cocked firstly. 
     In addition, when the sheet is jammed in the upstream portion or the downstream portion of the belt conveying portion 4, only by lowering the upstream portion or the downstream portion of the belt conveying portion 4, the jammed sheet can be removed, thus facilitating the jam treatment. 
     Further, even if the belt conveying portion 4 is heavy, since the left and right link members 6b 3 , 6b 4  can be rotated independently through the respective levers (not shown), it is possible to alleviate the load acting on each lever. 
     Next, a third embodiment of the present invention will be explained. 
     FIGS. 6A to 6E show a support releasing mechanism 6 according to a further embodiment. Incidentally, the elements in FIGS. 6A to 6C the same as those shown in FIGS. 1A to 1C are designated by the same reference numerals and detailed explanation thereof will be omitted. 
     In this third embodiment, instead of the upstream and downstream portions of the belt conveying portion 4 being lifted and lowered as in the aforementioned first and second embodiments, a front portion (right portion in FIGS. 6A to 6C) and a rear portion (left portion in FIGS. 6A to 6C) of the belt conveying portion 4 are lifted and lowered, and the support releasing mechanism is constituted as shown in FIG. 6C. 
     More particularly, a front plate 4g forming a part of the belt conveying portion 4 is provided on the front portion of the belt conveying portion 4, and a connecting plate 4i having a horizontal slot 4h is attached to a lower surface of the front plate 4g. Further, a pin 6e 1  formed on an upper end of a front support arm 6e is slidably received in the horizontal slot 4h. 
     The front support arm 6e is pivotally connected at its lower end to a frame (not shown) of the recording apparatus A via a pivot pin 6e 2  Further, the front support arm 6e is pivotally connected at its intermediate portion to one end of an intermediate support arm 6f having a toggle mechanism, via a pivot pin 6e 3 . 
     On the other end of the intermediate support arm 6f, there is rotatably mounted a guide roller 6g via a pin 6g 1 , which guide roller can roll, for example, on a stay (not shown) of the recording apparatus A. The pin 6g 1  is slidably received in a longitudinal slit 6h 1  formed in a main link plate 6h disposed below and substantially in parallel with the belt conveying portion 4. Further, a front link plate 6i is pivotally connected at its lower end to the pin 6g 1 . 
     The front link plate 6i is slidably and pivotally received at its upper end in a slit 6j 1  formed in a handle plate 6j disposed in front of the belt conveying portion 4, via a pin 6i 1 . The handle plate 6j serves to operate the support releasing mechanism 6 and is provided at its upper end with a roller-shaped handle 6j 2  and is pivotally connected at its lower end to one end (right end in FIG. 6C) of the main link plate 6h, via a pivot pin 6j 3 . A guide roller 6k rolling on the stay (not shown) of the recording apparatus A is rotatably mounted on the pivot pin 6j 3 . 
     On the other hand, a rear side plate 4j is mounted at the rear side of the belt conveying portion 4, and a rear support arm 6l having a toggle mechanism is pivotally connected at its upper end to the rear side plate 4j via a pivot pin 6l 1 . Further, a guide roller 6m is rotatably mounted on the pin 6l 1 . 
     The rear support arm 6l is pivotally connected at its lower end to the other end (left end in FIG. 6C) of the main link plate 6h via a pivot pin 6l 2 . On the pivot pin 6l 2 , there is rotatably mounted a guide roller 6n rolling on the stay (not shown) of the recording apparatus A. 
     Incidentally, in FIGS. 6A and 6C, the reference numeral 6o denotes a stopper for the guide roller 6g. Further, in FIGS. 6A and 6B, the reference numeral 6p denotes a guide portion for guiding the guide roller 6m. 
     According to this third embodiment, in order to change from the image recording position shown in FIG. 6C to the releasing position shown in FIG. 6A, first of all, by manipulating the handle 6j 2 , the handle plate 6j is rotated in a direction shown by the arrow e in FIG. 6C to bring it in a horizontal position. In this case, as shown in FIG. 6D, since the pin 6i 1  is engaged by a recess 6i 1  &#39; disposed at one end of the slit 6j 1 , when the handle plate 6j is rotated in the direction e, the front link plate 6i is pulled in the same direction, with the result that the guide roller 6g is rolling while sliding the pin 6g 1  to the left in FIG. 6C along the slit 6h 1 . Consequently, the lower end of the intermediate support arm 6f is pulled, thus bringing down the front support arm 6e. 
     As a result, the front portion of the belt conveying portion 4 is rotated downwardly around the pin 6l 1 , thus reaching a condition as shown in FIG. 6B. In the condition shown in FIG. 6B, since the main link plate 6h is not shifted to the right in FIG. 6B, the rear support arm 6l is not brought down, and, accordingly, the rear portion of the belt conveying portion 4 is not lowered. 
     Then, when the handle 6j 2  is pulled in a direction shown by the arrow f in FIG. 6B from the condition shown in FIG. 6B, the handle plate 6j, pin 6j 3  and main link plate 6h are shifted in order in the same direction. Consequently, the guide roller 6m on the pin 6l 1  is lowered substantially vertically along the guide portion 6p, with the result that the rear portion of the belt conveying portion 4 is lowered substantially vertically, thus releasing the support releasing mechanism in a condition that the flat portion of the belt conveying portion 4 is maintained substantially in parallel with the flat portion of the image recording means 2 as shown in FIG. 6A. 
     When the guide roller 6m is lowered, as shown in FIG. 6E, since the pin 6j 1  of the front link plate 6j is escaped from the recess 6j 1  &#39; due to the gravitational force, the members from the front link plate 6j to the front support arm 6e are not pulled. 
     In order to return from the releasing position shown in FIG. 6A to the image recording position, the reverse operation may be effected. That is to say, the handle 6j 2  is first pushed in a direction f&#39; opposite to the direction f, and then, when the rear portion of the belt conveying portion 4 is lifted up to the condition shown in FIG. 6B, the handle 6j 2  is rotated in a direction shown by the arrow e&#39;, thus cocking the handle plate 6j. Consequently, as shown in FIG. 6C, the belt conveying portion 4 is lifted to approach the image recording means 2, thus causing the belt conveying portion 4 be situated substantially in parallel with the image recording means 2. 
     Also, in this third embodiment, since the flat portion of the belt conveying portion 4 is spaced from the image recording means 2 in parallel thereto as shown in FIG. 6A, the space between the belt conveying portion and the image recording means can be made large and uniform, whereby the jam treatment can be easily effected, and the recording apparatus can be made small-sized because a large space is not required below the belt conveying portion 4. 
     Further, when the releasing position is changed to the image recording position, since the front portion of the belt conveying portion 4 is rotated upwardly around the pin 6l 1  at the rear side of the belt conveying portion 4 as shown in FIG. 6B (that is, the belt conveying portion approaches the image recording means 2 in the inclined fashion), the air between the belt conveying portion and the image recording means flows toward the front side of the belt conveying portion 4. Thus, similar to the first and second embodiments, when the belt conveying portion 4 is lifted, it is not, feared that dirt, dust, paper powder and the like will adhere to the ink discharge openings 20d 1  of the image recording means to clog the same. Further, since the percentage of the weight of the belt conveying portion 4 acting on the support releasing mechanism 6 is smaller, the construction of the apparatus can be simplified. 
     Lastly, other embodiments or alterations will be explained. 
     Image Recording Means 
     As the image recording means 2, other than the above-mentioned combination of the discharge openings, liquid passages and electrical/thermal converters, an image recording means wherein heat acting portions are disposed at curved areas as disclosed in U.S. Pat. No. 4,558,333 and the Japanese Patent Laid-Open No. 59-123670 can be adopted. 
     Further, while an example that the ink is supplied to the recording heads from the ink cartridges removably mounted on the recording apparatus in the image recording means was explained, a disposable recording head wherein an ink containing chamber is formed in the head and the head itself can be replaced when the ink is used up may be utilized. 
     Furthermore, instead of the ink jet recording means, an image recording means by which a toner image is formed on an image bearing member such as a photosensitive drum and the toner image is transferred onto a sheet can be applied to the recording apparatus according to the present invention. In this case, it is prevented that the surface of the drum is damaged by and/or the transferred image is badly influenced by dirt, dust, paper powder and the like entrained in the air flow generated by lifting the belt conveying portion 4. 
     Support Releasing Mechanism 
     While an example that the support releasing mechanism 6 supports the belt conveying portion 4 in such a manner that the latter can be shifted toward and away from the image recording means was explained, the support releasing mechanism is not limited to this example, but may support the image recording means 2 in such a manner that the latter can be shifted toward and away from the belt conveying portion 4. Further, the support releasing mechanism may be so constructed that it supports both the belt conveying portion 4 and the image recording means 2 to shift them toward and away relative to each other. 
     Incidentally, the recording apparatus according to the present invention can be applied to image outputting thermal equipment of an information processing system such as a computer, a facsimile system having a communication function, or the like, as well as a copying machine incorporating the scanner portion 1. 
     Incidentally, when the ink image jet recording means is used, the belt conveying portion is spaced apart from the ink jet recording heads by a predetermined distance in the image recording position; whereas, when the image bearing member is used, in the image recording position, the belt conveying portion may be contacted with the ink jet recording heads or may be spaced apart from the ink jet recording heads by a predetermined distance.