IMAGE RECORDING APPARATUS PROVIDED WITH PLURAL TYPES OF RECORDING SHEETS

Abstract: In an image recording apparatus, a desired recording sheet is automatically selected from a sheet feeding section that is provided with plural types of image recording sheets (11-14) at least one of which is a photosensitive and pressure-sensitive recording sheet, based on encoded data that corresponds to the individual types of recording sheets. The selected recording sheet is fed through feeding means (108) to an image recording section (30, 107) where an image recording operation is performed in accordance with the type of the selected sheet.

Description: The present invention relates to an image recording apparatus comprising a sheet feeding section provided with several types of recording sheets. This type of image recording apparatus is adapted for use in copying apparatuses, printers, and the like. For instance, a known copying apparatus equipped with the image recording apparatus of this type is designed to permit an operator to manually select a desired one from plural types of recording sheets or copying sheets different in size and provide a copy using the xerography. Recently, however, various types of recording techniques have been developed and different types of recording sheets have appeared, accordingly. A photosensitive and pressure-sensitive recording sheet is one of the recording media that are receiving the greatest attention today. The photosensitive and pressure-sensitive recording sheet has a plurality of micro capsules on its surface which become hardened upon reception of light and are soft when receiving no light. When pressure is applied to this sheet, the hardened micro capsules are not ruptured while the soft micro capsules, which have been shielded from light by a shielding member, are ruptured. Consequently, the photosensitive and pressure-sensitive recording sheet is colored by the chromogenic materials encapsulated in the micro capsules. An image recording apparatus provided with a photosensitive and pressure-sensitive recording sheet, particularly of a color type is characterized by its significantly low manufacturing cost and simple structure, as compared with a conventional color image recording apparatus which forms a color image on a recording sheet. Further, when the image recording apparatus provided with a monochromatic photosensitive and pressure-sensitive recording sheet is used as a copying apparatus, it is more compact than conventional coping apparatuses. An image recording apparatus of the above-described kind is known from the US-A-4,350,434 or EP-A-l59 569 or JP-A-59 152 461, respectively. These apparatuses provide for the possibility of having plural types of recording sheets in the apparatus. No provision is given for an automatic control of the selection of the type of sheet corresponding to an image to be recorded. Therefore, errors may occur in this selection. From the JP-A-61 902 884 a recording apparatus is known which may be used with photosensitive and pressure sensitive recording sheets. One type of the photosensitive and pressure-sensitive recording sheet is a transfer type of a recording sheet, which is disclosed, for example, in U.S. Patent No. 4,399,209. According to the transfer type of recording sheet, a first sheet having a layer of pressure rupturable micro capsules coated on a substrate cooperates with a second sheet having a layer of a developer material that is coated on another substrate. When these two sheets overlap one upon another, the developer material reacts with the chromogenic material encapsulated in the ruptured micro capsules so that a predetermined image is transferred from the first sheet onto the second sheet. Another type of a recording sheet, so-called a self-chromogenic type, which has both of the layer of micro capsules and the layer of a developer material formed on the same substrate, is disclosed in U.s. Patent No. 4,440,846. No image recording apparatus has been developed yet, which is provided with plural types of recording sheets that includes at least one of the aforementioned types of the photosensitive and pressure-sensitive recording sheets and which is capable of selecting a desired type of a recording sheet and recording image information thereon. Development of such an image recording apparatus should satisfy the condition that the desired type of recording sheets be properly selected. If not, for example, a monochromatic image may be erroneously formed on a color photosensitive and pressure-sensitive recording sheet or an image may be formed on only one surface of a double-side photosensitive and pressure-sensitive recording sheet, thus resulting in an increase in the running cost. Therefore, there is a demand for an easy and solid solution to this problem. The selection of the desired type recording sheet may be manually executed by an operator; however, such an operation is likely to be erroneous and is troublesome. This problem also needs to be attended. SUMMARY OF THE INVENTION With the above situation in mind, therefore, it is an object of the present invention to provide an image recording apparatus, which is provided with plural types of recording sheets and is capable of automatically and properly selecting a desired type of recording sheets, thus preventing an increase in the running cost due to the otherwise possible erroneous selection of the recording sheets and eliminating the troublesome operation. To achieve the object, the image recording apparatus according to this invention is characterized by the features of claim 1 or 9, respectively. Thereby a desired type of a recording sheet is selected by the selection means under the control of control means, and it is fed from the sheet feeding section to an image recording section and is subjected to an image formation by image recording means. This structure eliminates the need for an operator to manually select a desired recording sheet and thus eliminates the otherwise necessary troublesome operation. Further, the erroneous selection of the recording sheets can be prevented, thus preventing the running cost from increasing. Electrically encoded data (called a sheet code) corresponding to the individual types of the recording sheets is set as the selection means, and when one type of a recording sheet is selected by using such a sheet code, this recording sheet is fed to the image recording section which in turn is controlled to form an image onto the recording sheet. This permits the proper sheet to be automatically selected and causes the image recording section to be controlled according to the selected sheet. Therefore, it is unnecessary for the operator to manually select a desired recording sheet and the erroneous selection of the recording sheets can be prevented, thus reducing the running cost. The image recording section, which forms an image on a selected one of plural types of recording sheets, always provides a stable and accurate image and is significantly simple. Other objects and advantages will become more apparent as a detailed description of the preferred embodiments of this invention presented below proceeds with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of an image recording apparatus according to the first embodiment of this invention; Fig. 2 is a block diagram showing a control system of the apparatus of Fig. 1; Figs. 3(a) to 3(g) are flowcharts illustrating a sequence of image recording operations; Fig. 4 is a schematic diagram of an image recording apparatus according to the second embodiment of this invention; Fig. 5 is a perspective view showing an exposure frame disposed in the apparatus of Fig. 4; Fig. 6 is a diagram illustrating an image area adjusted on a continuous sheet by the exposure frame of Fig. 5; and Fig. 7 is a block diagram illustrating a control system of the apparatus of Fig. 4. DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an image recording apparatus according to this invention will now be explained with reference to the accompanying drawings. Figs. 1 through 3G illustrate an image recording apparatus according to the first embodiment of this invention. As shown in Fig. 1, the image recording apparatus is provided with three types of photosensitive and pressure-sensitive recording sheets 11, 12 and 13 and ordinary photosensitive recording sheets 14, with each type of recording sheets being stacked in a paper tray or cassette. Above the individual recording sheets 11-14 are sheet feed rollers 11a to 14a provided to feed the respective types of recording sheets 11-14 to an image recording section 30, which will be described later, from a sheet feeding section where these sheets 11-14 are disposed. As the feed rollers 11a-14a rotate, the respective recording sheets 11-14 are inserted into sheet guides 11b-14b; since this guiding mechanism of this type of recording apparatus is well known, its detailed description will be omitted. The photosensitive and pressure-sensitive recording sheets 11 (hereinafter also referred to as monochromatic sheets) each have a number of monochromatic micro capsules (not shown) on one surface. Those monochromatic micro capsules which have been exposed to light through monochromatic filter 33B and a shutter 36 to be described later and are therefore hardened, are not ruptured for a coloring effect when pressure is applied on the recording sheets 11. In contrast, unexposed monochromatic micro capsules are not hardened and are ruptured to provide a black color when pressure is applied on the recording sheets 11. The photosensitive and pressure-sensitive recording sheets 12 (hereinafter also referred to as color sheets) each have a number of color micro capsules (not shown) on one surface, which contain chromogenic materials for the basic colors, cyan, magenta and yellow. The cyan micro capsules, magenta micro capsules and yellow micro capsules become hardened only by the light with the associated waveforms, and would not be hardened by light with other waveforms. The micro capsules of each color that are hardened due to light exposure through the shutter 36 and the associated one of a cyan filter 33C, a magenta filter 33M and a yellow filter 33Y, are not ruptured when pressure is applied to the recording sheet 12. However, the unexposed, soft micro capsules are ruptured by the pressure application on the recording sheet 12. The photosensitive and pressure-sensitive recording sheets 13 (hereinafter also referred to as double-side sheets) have a layer of monochromatic micro capsules coated on both surfaces. Each double-side sheet 13 has its one surface first exposed to light through the monochromatic filter 33B and the shutter 36, and is then turned over by a sheet changing device 110 (which will be described later) of the recording sheet 13 so that the other surface is exposed to light. Consequently, when pressure is applied to both surfaces of the recording sheet 13, a black image is formed on either surface. As should be clear from the above, all of the three types of photosensitive and pressure-sensitive recording sheets 11, 12 and 13 are of self-chromogenic type and each have a layer of a developer material on its one surface in addition to a layer of photosensitive micro capsules. The thermal recording sheets 14 are of a conventional type which provides a color by the heat from the heat generating section (not shown) of a line thermal head 44 to be described later. A monochromatic image can be formed on the thermal recording sheets 14 instead of the monochromatic photosensitive and pressure-sensitive recording sheets 11. The sheet guides 11b to 14b are provided with the respective pairs of sheet feed rollers 11c-13c to feed the recording sheets 11-14 to a sheet feeding belt 28 which will be described later. The recording sheet 11, 12, 13 or 14 fed via the respective sheet guide 11b, 12b, 13b or 14b is disposed on the sheet feeding belt 28 and is conveyed with the movement of this belt. The sheet feeding belt 28 moves by the rotation of a plurality of pulleys 29 that support the belt. As one of the pulleys 29 is connected to a stepping motor (not shown) through a gear, the sheet feeding belt 28 moves by a predetermined pitch when the stepping motor is driven by a predetermined angle. Above the sheet feeding belt 28 is disposed the image recording section 30, which comprises a light source 34, a lens 35, a filter 33, the optical shutter 36 and a lense 37. Light emitted from the light source 34 is irradiated on the recording sheet 11, 12 or 13 on the sheet feeding belt 28 through the lens 35, filter 33, optical shutter 36 and lens 37. In this embodiment, the light source 34 is constituted by a fluorescent lamp. Although not illustrated, a light-transmittive original, for example, as image information to be recorded, is disposed at the proper location in the light path of the image recording section 30. For a light-nontransmittive original, the light from the light source 34 that is reflected at the original is guided to the light path. The filter 33 comprises the monochromatic filter 33B, the cyan filter 33C, the yellow filter 33Y and a support/driving section 33A, which supports the individual filters 33B, 33C, 33B and 33Y and rotates the filters to selectively dispose them in the light path. The optical shutter 36 is constituted by a PLZT shutter in this embodiment, but may be of a different type that uses another magnetic fluid. The optical shutter 36, under the control of a control processing unit (hereinafter referred to as CPU) 101, shields light when a predetermined image on the recording sheet is not to be exposed and permits the light when the image is to be exposed. The lenses 35 and 37 are disposed so as to focus the light from the light source 34 on one line of the selected one of the recording sheets 11-13. Accordingly, the selected recording sheet 11, 12 or 13 is fed on the feeding belt 28 by a predetermined pitch and each line is exposed every time. When the selected recording sheet is fed by one page, it is exposed by one page. Each of the photosensitive and pressure-sensitive recording sheets 11-13 fed by the feeding belt 28 passes a sheet changing gate 52 to be described later and is developed and fixed by a pair of pressure fixing rollers 40. Consequently, an image is formed on the photosensitive and pressure-sensitive recording sheets 11, 12 or 13 and this recording sheet is received in a sheet receiving cassette 70. The sheet changing device 110 comprises a guide passage 53 for turning over the recording sheet that has been fed, and the sheet changing gate 52 for selecting whether the recording sheet 13 is inserted in the passage 53 or is moved toward the pressure fixing rollers 40. A thermal recording device 107 is disposed between the sheet changing gate 52 and the feeding belt 28. The thermal recording device 107 comprises a thermal head 44 with a one-line width, a platen 45 and a pressing/release mechanism (not shown) which presses the thermal head 44 onto the platen 45 or releases the pressure on the thermal head 44. The arrangement of the electronic control for this recording apparatus will now be explained with reference to the block diagram of Fig. 2. The central processing unit (CPU) 101 for controlling the recording apparatus receives recording data from an external computer 102. The recording data includes image recording data such as characters to be recorded and electrically encoded data (hereinafter called a sheet code) that is provided for each type of recording sheets to specify on which recording sheet 11, 12, 13 or 14 the image recording data is to be recorded. This sheet code constitutes the selection means to select the recording sheets 11-14. The CPU 101 is coupled to a random access memory (hereinafter called RAM) that stores the recording data, and a read only memory (hereinafter called ROM) 104 that stores a program to control the CPU 101 and the image recording data that is a pattern of characters to be recorded. The ROM 103 is capable of storing data of at least one page of a recording sheet. Further, the CPU 101 is designed to operate an optical controller 105 for controlling the optical shutter 36, an optical filter controller 106 for controlling the optical filter 33, a thermal recording device 107 for controlling the thermal head 44, a sheet feeding device 108 for controlling the sheet feed rollers 11a-14a, the sheet feeding belt 28 and other sheet feed rollers, a developing device 109 for controlling the pressure fixing rollers 40 and the sheet changing device 110 for controlling the sheet changing gate 52. The illustrated developing device 109 has, on the back of the pressure fixing rollers 40, rollers similar to thermal fixing rollers 231 ad 232 of the second embodiment, although such an arrangement is omitted in Fig. 1. The operation of the recording apparatus will now be explained according to the flowcharts shown in Figs. 3(a) to 3(g). In Fig. 3(a), the CPU 101 receives data from the external computer 102 (step S1) and stores the received data (step S2). The CPU 101 then converts those data from the received data which are, for example, characters to be recorded, into pattern data (step S3) and receives the sheet code (step S4). The CPU 101 determines whether or not the sheet code is a code to select a monochromatic photosensitive and pressure-sensitive recording sheet (the code being hereinafter referred to as a monochromatic code) (step S5). In the following description, a code to designate the color photosensitive and pressure-sensitive recording sheet 12 is called a color code, a code to designate the photosensitive and pressure-sensitive recording sheet 13 for double-side recording is called a double-side code, and a code to designate the thermal recording sheet 14 is called a thermal code. If YES in step S5, the CPU 101 executes step S10, while if NO in step S5, the CPU 101 determines whether or not the sheet code is the color code (step S6). If YES in step S6, the CPU 101 executes step S20, and if NO in step S6, the CPU 101 determines whether or not the sheet code is the double-side code (step S7). If YES in step S7, the CPU 101 executes step S61, and if NO in step S7, the CPU 101 determines whether or not the sheet code is the thermal code (step S8). If YES in step S8, the CPU 101 executes step S75, and if NO in step S8, the CPU 101 determines whether or not the sheet code is present. If YES in step S9, the CPU 101 executes step S5, and if NO in step S9, the CPU 101 terminates the operation. If YES in step S5, as illustrated in Fig. 3(b), the CPU 101 controls the optical filter controller 106 to set the monochromatic filter 33B (step S10). This positions the monochromatic filter 33B in the light path between the light source 34 to the photosensitive and pressure-recording sheets 11. The CPU 101 controls the feeding device 108 to feed the monochromatic sheet 11 (step S11). Accordingly, the monochromatic sheet 11 is inserted in the sheet guide 11b by the rotation of the sheet feed roller 11a and is conveyed to an exposing position on the feeding belt 28 by the sheet feed roller 11c. The monochromatic sheet 11 is fed by the feeding belt 28 and is kept conveyed by the CPU 101 untill the CPU 101 determines that the monochromatic sheet is at a predetermined position (step S12). Here, the CPU 101 is coupled to a sensor (not shown) that detects the presence of the monochromatic sheet at the predetermined position. The CPU 101 outputs the pattern data to the optical shutter controller 105 (step S13) and sets the optical shutter 36 via the optical shutter controller 105 (step S14). The CPU 101 then energizes the light source 34 for an exposing operation (step S15) and controls the feeding device 108 to move the feeding belt 28 by one line (step S16). In the subsequent step S17, the CPU 101 determines whether or not the exposure of one page of the recording sheet 11 is completed. If the exposure of one page of the recording sheet 11 is not completed, the CPU 101 repeates steps S13 to S17. When one page exposure is completed, a latent image is formed on the sheet 11, and the CPU 101 controls the feeding device 108 to feed the monochromatic sheet 11 to the pressure fixing rollers 40 (step S18). Then, the CPU 101 controls the developing device 109 so that the monochromatic sheet 11 is developed and fixed by the pressure fixing rollers 40 (step S19), thus forming a monochromatic image on the sheet 11. Then, the CPU 101 again executes step S4. If YES in step S6, the CPU 101 determines in step S20 whether or not the sheet code is the cyan code, as shown in Fig. 3(c). If YES in step S20, the CPU 101 sets the cyan filter 33C in the aforementioned manner (step S21). Then, the CPU 101 controls the feeding device 108 to feed the color sheet 12 (step S22) and keeps the sheet feeding until it determines that the color sheet 12 is at a predetermined exposing position. Thereafter, the CPU 101 executes steps S24 to S28 so that a cyan latent image is formed on one page of the color sheet, as per the formation of the latent image on the monochromatic sheet. The CPU 101 then determines whether or not the recording is completed with respect to the same color sheet 12 (step S29). If YES in step S29, the CPU 101 feeds the color sheet 12 to the pressure fixing rollers 40 (step S30) and then controls the developing device 109 to form a cyan image on the color sheet 12 (step S31). If NO in step S29, the CPU 101 determines whether or not the magenta code is present in the sheet code (step S32), as illustrated in Fig. 3(d). Here, it is determined whether or not a magenta latent image should be formed after the cyan latent image is formed on the color sheet 12. If YES in step S32, the CPU 101 sets the magenta filter 33M in the aformentioned manner (step S33). In the subsequent step S34, the CPU 101 determines whether or not the color sheet 12 on which the magenta latent image is to be formed is the previous sheet on which the cyan latent image has been formed. If YES in step S34, the sheet 12 is fed until the CPU 101 detects that the previous sheet 12 is at a predetermined position (steps S35 and S36). If NO in step S34, a new color sheet 12 is fed until the CPU 101 detects that the new color sheet 12 is at the predetermined position (steps S37 and S38). Thereafter, the CPU 101 executes steps S39 to S43, thus forming a magenta latent image on one page of the color sheet 12. In the subsequent step S44, the CPU 101 determines whether or not forming the latent image on the same color sheet 12 is completed. If YES in step S44, the CPU 101 feeds the color sheet 12 to the pressure fixing rollers 40 (step S45) and controls the developing device 109 to form a magenta image on the color sheet 12 (step S46). In this case, when the cyan and magenta latent images are formed on the color sheet 12, an image with a mixture of the cyan and magenta colors is formed, while when only the magenta latent image is formed on the color sheet 12, an image of the magenta color is formed. If NO in step S44, as shown in Fig. 3(e), the CPU 101 determines whether or not the yellow code is present in the sheet code (step S47). If NO in step S47, the CPU 101 executes step S4 again. If YES in step S47, the CPU 101 executes steps S48 to S60 so that a yellow image is formed on the color sheet 12. Therefore, when the CPU 101 executes the aforementioned steps S10 to S60, a color image is formed on the color sheet 12. If YES in step S7, the CPU 101 feeds the double-side sheet 13 until the sheet is detected to be at a predetermined position (steps S61 and S62), as illustrated in Fig. 3(f). The CPU 101 then executes steps S63 to S67 and forms a latent image on one surface of the double-side sheet 13 in the same manner as the monochromatic latent image is formed on the monochromatic sheet 11. Then, the CPU 101 determines whether or not latent images are formed on both surfaces of the double-side sheet 13 (step S68). If YES in step S68, the double-side sheet 13 is fed to the pressure fixing rollers 40 (step S69) and the CPU 101 controls the developing apparatus 109 to form images on both surfaces of the double-side sheet 13 (step S70). If NO in step S68, the CPU 101 controls the sheet changing device 110 to move the sheet changing gate 52 in the arrow direction in Fig. 1 to the changing position indicated by the chain line so that the double-side sheet 13 is inserted into the passage 53 (step S71). The CPU 101 then controls the feeding device 108 to feed the double-side sheet 13 in the direction opposite to the sheet feeding direction until the double-side sheet 13 is turned over and is fed to a predetermined position (steps S72 and S73). When the CPU 101 detects that the double-side sheet 13 is again at the predetermined exposing position on the belt 28, the CPU 101 controls the sheet changing device 110 to reset the sheet changing gate 52 to the original position indicated by the real line in Fig. 1 so that the double-side sheet 13 is fed to the pressure fixing rollers 40 (step S74). Then, the CPU 101 executes steps S63 to S67 to form a latent image on the back surface of the double-side sheet 13. If YES in step S8, as illustrated in Fig. 3(g), the CPU 101 controls the feeding device 108 to feed the thermal sheet 14 until the sheet 14 is detected to be at a predetermined position (steps S75 and S76). Then, the CPU 101 outputs the pattern data to the thermal recording device 107 (step S77) and controls the thermal head 44 to execute a line recording (step S78). The CPU 101 then controls the feeding device 108 to feed the thermal sheet 14 by one line (step S79) and determines whether or not a page recording is completed (step S80). If NO in step S80, the CPU 101 executes steps S77 to S80. If YES in step S80, the CPU 101 controls the feeding device 108 to feed the thermal sheet 14 to the receiving case 70 (step S81). In the subsequent step S82, the CPU 101 determines whether or not the sheet code is present. If YES in step S82, the CPU 101 re-executes step S4, and if NO in step S82, the CPU 101 terminates the operation. According to this embodiment, the image recording apparatus is provided with plural types of recording sheets three of which are photosensitive and pressure-sensitive recording sheets. However, it is not necessary to provide three types of photosensitive and pressure-sensitive recording sheets; a combination of color photosensitive and pressure-sensitive recording sheets and monochromatic photosensitive and pressure-sensitive recording sheets or a combination of monochromatic photosensitive and pressure-sensitive recording sheets and double-side photosensitive and pressure-sensitive recording sheets may be provided. Further, according to this embodiment, the thermal recording device is combined with the recording apparatus that uses photosensitive and pressure-sensitive recording sheets. As a modification, however, the thermal recording device may be combined with a recording apparatus using another xerographic process for better operability. Moreover, the sheet code may be output from a switch that can be selected by the users. Fig. 4 illustrates a color image recording apparatus according to the second embodiment of this invention, which uses photosensitive and pressure-sensitive recording sheets of a transfer type. Inside a housing 200 of the image recording apparatus are an exposing unit 201, a sheet moving unit 203 for moving a continuous sheet 202, a sheet feeding unit 207 provided with cut sheets 204, 205 and 206 different in size, a developing unit 208, and a sheet feeding unit 209 for selectively feeding the individual cut sheets to the developing unit 208. The continuous sheet 202 is tightly disposed between a pair of wind-up rollers 210 and 211 that are forward and reverse rotatable by driving a pair of motors provided in the sheet moving unit 203. The continuous sheet 202 has a layer of photosensitive micro capsules coated on its one surface, each capsule containing a cyan, magenta or yellow chromogenic material, and constitutes one of transfer type recording sheets that are to overlap each other. The cut sheets 204-206 disposed in the sheet feeding unit 207 each have a developer material coated on one surface and constitute the other one of the transfer type recording sheets. When the cut sheets and the continuous sheet are overlaid one upon another and pressed at the developing unit 208, the developer material reacts with the chromogenic material encapsulated in the micro capsules on the continuous sheet 202 to provide various colors and transfer a color image on the cut sheets. The cut sheets 204-206 of this embodiment correspond to the different types of recording sheets 111-114 in the first embodiment, and the selective feeding of these cut sheets 204-206 is performed in the same manner as done in the first embodiment. The cut sheets 204-206 are stacked in sheet feeding cassettes 212, 213 and 214, respectively, and are fed through a sheet guide 218 between a pair of pressure developing rollers 219 and 220 of the developing unit 208 by the selective rotation of sheet feed rollers 215, 216 and 217 and are overlaid with the continuous sheet 202 there. The roller 220, i.e., one of the pressure developing rollers 219 and 220, is located at the end portion of the horizontal moving path of the continuous sheet 202 that moves in the arrow direction, and movably anchors the continuous sheet 202, thus having the function of the moving unit 203. The exposing unit 201 has a fixed original table 222 of transparent glass on which an original 221 is disposed, and an original cover 223. Under the original table 222 lies an exposing lamp 224 as a light source. The light emitted to the original 221 from the lamp 224 and reflected downward of the original table 222 is projected onto the continuous sheet 202 through a plurality of mirrors 225, an image-forming lens 226, a three-color separation filter 227, and the last, fixed mirror 228, thereby forming a latent image corresponding to the original 221. The lamp 224 is moved, as indicated by the chain line, in the arrow direction in Fig. 4 so as to scan the original 221. The three-color separation filter 227 comprises a red filter section 227a, a green filter section 227b and a blue filter section 227c. In accordance with the spectral sensitivities of the individual micro capsules on the continuous sheet 202, the red filter section 227a permits only the light with the waveform to harden the cyan micro capsules, the green filter section 227b permits only the light with the waveform to harden the magenta micro capsules, and the blue filter section 227c permits only the light with the waveform to harden the yellow micro capsules. These filter sections 227a-227c are selectively positioned in the light path by rotating the filter 227. This filter 227 provides the same effects as the filter 33 of the first embodiment. The developing unit 208 further has a feeding belt 230 and a pair of thermal fixing rollers 231 and 232. When the selected cut sheet and the continuous sheet 202 are overlaid one upon another at the pressure developing rollers 219 and 220, an image is transferred from the continuous sheet onto the cut sheet. The cut sheet is then guided to the thermal fixing rollers 231 and 232 by means of the feeding belt 230 and is subjected to a thermal fixing there, and is discharged onto a tray 233, as indicated by the arrow. In Fig. 4, the exposure frame 240 indicated by the two-dot chain line is disposed below the original table 222 and between this table and the exposing lamp 224. As shown in Fig. 5, the exposure frame 240 comprises an L-shaped fixed frame 241 of a plate member and X-directionally and Y-directionally movable frames 242 and 243 of a wide plate member, and has a square frame shape. An opening P which permits the irradiation light from the light-source lamp 224 and the reflection light from the original 221 to pass therethrough is formed in the exposure frame 240. The bottom surface of each of the frames 241, 242 and 243 (the bottom side of the sheet in Fig. 5) is coated with a paint having a spectral reflectivity that makes the light with a waveform to harden the associated micro capsules on the continuous sheet 202 to be reflectable. Both of the movable frames 242 and 243 are movably supported by guide rods 244 and 245 and screw rods 246 and 247, respectively. When the screw rods 246 and 247 are rotated by an X-direction driving motor 248 and a Y-direction driving motor 249, which are respectively fixed to the screw rods 246 and 247 and are each constituted by a stepping motor, the movable frames 242 and 243 are moved in the X and Y directions in Fig. 5, thus changing the size of the opening P in accordance with the size of the original 221. The guide rods 244 and 245, the screw rods 246 and 247, and the X-direction and Y-direction driving motors 248 and 249 constitute moving means to relatively move the individual frames 241, 242 and 243. According to the apparatus of this embodiment, for instance, when the size of the next original 221 to be recorded differs or the size of the cut sheet 204, 205 or 206 for enlarging the original 221 differs, the individual driving motors 248 and 249 are driven by operating a switch on an operation panel 43 (see Fig. 7) provided on the apparatus, so that the movable frames 242 and 243 are moved to adjust the area of the opening P of the exposure frame 240 in accordance with the size of the original 221 or the sheet 204, 205 or 206. And as illustrated in Fig. 6, an image area Q on the photosensitive and pressure-sensitive continuous sheet 202 that corresponds to the opening P is adjusted and a non-image area R formed by the exposure frame 28 is adjusted accordingly. The non-image area R is exposed to light by the reflection light from the bottom surface of the exposure frame 240 so that the micro capsules in this non-image area on the continuous sheet 202 are hardened. When the continuous sheet 202 is overlaid on the selected one of the cut sheets 204-206 and pressed, the micro capsules of the non-image area R are ruptured, which prevents the chromogenic materials in the capsules from flowing out and thus prevents the pressure developing rollers 219 and 220 from being stained by the action. Consequently, a stainless image transfer is possible on the selected cut sheet, thus always ensuring the recording of a clear image. A control circuit for the color image recording apparatus will now be briefly explained with reference to Fig. 7. A CPU 250 controls this apparatus according to a program stored in a ROM 251. The CPU 250 is coupled through an input interface 253 to the operation panel 252 and receives various types of signals, which are stored in a RAM 254. The CPU 250 is coupled to the exposing unit 201, cut sheet feeding unit 207, sheet moving unit 203 and exposure frame 240 respectively through drivers 255, 256, 257 and 258 and an output interface 259, and outputs driving signals thereto. Like the CPU 101 of the first embodiment, the CPU 250 selects the recording sheets 204-206 using sheet codes corresponding to these sheets and executes a sequence of image recording operations according to the selection. As this control is done in the same manner as is done in the first embodiment, its detailed explanation will be omitted.

Claims: An image recording apparatus comprising a sheet feeding section (10) provided with several types of recording sheets (11-14) at least one of which is a recording sheet comprising pressure-rupturable microcapsules; an image recording section having means for exposing (30) and developing (107,109) an image on each of said types of recording sheets; feeding means (108) for feeding recording sheets from said sheet feeding section (10) to said image recording section; and control means (101) - receiving a sheet code defining one of said types of recording sheets, which sheet code is automatically received, corresponding to the image to be recorded, - causing the feeding means to feed said one type of recording sheets, and - causing the exposing means and the developing means corresponding to said one type of recording sheets to record an image on said one type of recording sheets. The image recording apparatus according to claim 1, characterized in that one of said several types of recording sheets (11-13) is a self-chromogenic type color sheet provided with a layer of pressure rupturable microcapsules each containing a chromogenic material. The image recording apparatus according to claim 1, characterized in that one of said several types of recording sheets is a transfer type cut sheet (204-206) provided with a layer of a developer material; and that a continuous sheet (202) provided with a layer of pressure rupturable microcapsules is movably disposed in said image recording section, said continuous sheet and said cut sheet being overlaid one upon another so as to transfer an image on said cut sheet. The image recording apparatus according to claim 1, characterized in that one (13) of said several types of recording sheets is a self-chromogenic type double-side sheet having, on both surfaces, layers of pressure rupturable microcapsules each containing a chromogenic material; and that said feeding means has turnover means (110) for turning over said double-side sheet that has once been fed to said exposing means and feeding said turned double-side sheet again to said exposing means. The image recording apparatus according to claim 4, characterized in that said control means (101) drives said turnover means (110) in accordance with a sheet code indicating a double-side sheet (13). The image recording apparatus according to one of claims 1 to 5, characterized in that said exposing means includes exposure frame means (240) for adjustably defining an area of an image to be exposed, and operating means (248, 249) for operating said exposure frame means to adjust said area of said image in accordance with the size of said selected recording sheet. The image recording apparatus according to claim 6, characterized in that said exposure frame means (240) includes at least a pair of plate members (241, 242, 243) having a spectral reflectivity to allow said recording sheet comprising pressure rupturable microcapsules to be exposed. The image recording apparatus according to claim 7, characterized in that the exposure frame means (240) is of square shape. An image recording apparatus comprising: a sheet feeding section (207) provided with several types of cut sheets (204, 205, 206) different in size, each of which has a layer of a developer material formed on one surface thereof; sheet moving means (203) operable to move a continuous sheet (202) having a layer of pressure rupturable microcapsules formed on one surface thereof, in the lengthwise direction of said continuous sheet; exposing means (201) operable to expose an image on said continuous sheet; feeding means (209) operable to feed one of said types of said cut sheets in such a manner that said one cut sheet and said continuous sheet overlie one upon the other; developing means (208) for applying a pressure on said overlaid continuous sheet and said one cut sheet so as to transfer said exposed image from said continuous sheet onto said one cut sheet and fix said transferred image on said one cut sheet; and control means (250) receiving a sheet code defining one of said types of recording sheets, which sheet code is automatically received, corresponding to the image to be recorded, for driving said exposing means, said sheet moving means (203) and said feeding means (209). The image recording apparatus according to claim 9, characterized in that said developing means (208) includes a pressure roller (220) movably anchoring said continuous sheet (202) and constituting part of said sheet moving means (203).

Inventors: AKAO, MICHITOSHI, HAYASHI, SHIGEYUKI, SAKAI, JUN, SAKAKIBARA, KENJI
Applicants: BROTHER KOGYO KABUSHIKI KAISHA
Application year: 1987
Main classification: G03G15
IPC codes: G03G15, G03F7, B41M5