Document scanning machine

Abstract: An image processing machine functions both as a facsimile machine and as an ordinary copying machine. The image processing machine is provided with document scanning means and image-forming means. The document scanning means comprises a first scanning zone, a second scanning zone, image-receiving means, optical means for optically connecting the first scanning zone and the second scanning zone to the image-receiving means, first document scan moving means for moving a document across the first scanning zone and second document scan moving means for moving a document across the second scanning zone. The image-forming means comprises printing means with a print output zone and means for conveying a printing substrate through the printing output zone.

Description: Field of the Invention This invention relates to an image processing machine equipped with document scanning means and/or image forming means. The document scanning means optically scans a document to be converted into a transmission signal or copied. The image forming means forms an image on a printing substrate according to the received signal or to the optically scanned document. Description of the Prior Art An image processing machine such as a copying machine, a printing machine, or a facsimile machine capable of functioning as a copying machine or a printing machine is equipped with the document scanning means and/or the image forming means. Document scanning means for optically scanning a document which have so far been proposed and gained commercial acceptance are of the stationary document placing stand type, the movable document placing stand type or the sheet-like document conveying type. In document scanning means of the stationary document placing stand type, the document is placed on a transparent plate of the stationary document placing stand, and scanned by moving movable optical means along the transparent plate. In document scanning means of the movable document placing stand type, the document is placed on a transparent plate of the movable document placing stand, and scanned by moving the movable document placing stand across a scanning zone in which stationary optical means is in action. In document scanning means of the last-mentioned type, a sheet-like document conveying passage is provided extending across a scanning zone in which stationary optical means is in action, and the sheet-like document is scanned by conveying it through the conveying passage. The document scanning means of the sheet-like document conveying type can automatically scan a number of sheet-like documents more easily and rapidly than those of the other two types, but cannot scan documents of other shapes such as a book. The document scanning means of the stationary document placing stand type or the movable document placing stand type can scan various types of documents including a sheet-like document and a book. It has therefore been desired to develop document scanning means which functions not only as the sheet-like document conveying type but also as the stationary or movable document placing stand type. Patent Abstract of Japan Vol. 9, No. 102 (E-312) (1825), May 4, 1985 discloses a reader featuring document scanning means of the sheet-like document conveying type and the stationary document placing stand type combined in one apparatus. It is desirable to combine scanning means of the sheet-like document conveying type also with the movable document placing stand type, as in this way an image processing machine can be provided that has relatively small-sized and inexpensive document scanning means functioning both as a sheet-like document conveying type and as a movable document placing stand type. However, when these two types of scanning means are to be combined in a small-sized apparatus, in operation the movable document placing stand will move across or close to the document insertion opening of the sheet-like document scanning means. If the operation of causing the document scanning means to function as the sheet-like document conveying type is confused by error with the operation of causing the document scanning means to function as the stationary document placing stand type or the movable document placing stand type, it is likely that the operator's hand will be injured or the document will be damaged. The object of this invention is to provide an image processing machine equipped with document scanning means of the movable document stand type and the sheet-like document conveying type having safety characteristics to prevent injury to the operator's hand or damage to a document when the operation of activating the scanning means of the sheet-like document conveying type is confused by error with the operation of activating the scanning means of the movable document placing stand type. These objects are achieved by the invention as set out in the claims to which reference is now directed. Further objects of this invention will become apparent from the following description taken in conjunction with the accompanying drawings. Brief Description of the Drawings Figure 1 is a simplified sectional view showing one embodiment of the image processing machine of the invention; Figure 2 is a perspective view of the image processing machine shown in Figure 1; Figure 3 is a partial sectional view showing the method of mounting a movable document placing stand in document scanning means of the image processing machine shown in Figure 1; Figure 4 is a simplified partial sectional view for illustrating one mode of using the document scanning means of the image processing machine shown in Figure 1; Figures 5, 6, 7, 8 and 9 are a simplified partial sectional view, a perspective view, a simplified partial sectional view, a perspective view and a partial sectional view of a first modified embodiment of the movable document placing stand; Figures 10, 11 and 12 are a simplified partial sectional view, a perspective view and a simplified partial sectional view showing a second modified embodiment of the movable document placing stand; Figures 13, 14, 15, 16, 17-A and 17-B are a simplified partial sectional view, a perspective view, a simplified partial sectional view, a partial sectional view, an enlarged partial view and an enlarged partial view showing a third modified embodiment of the movable document placing stand. In order to facilitate the understanding of the invention, an image processing machine equipped with scanning means of the movable document stand type and the sheet-like document conveying type but not having the safety characteristics of the invention will be described with reference to Figs. 1-4. Figure 1 shows an image processing machine embodied as a facsimile machine capable of functioning as a copying machine. The illustrated image processing machine has a nearly rectangular parallel pipedal housing 2. Document scanning means shown generally at 4 and image-forming means shown generally at 6 are mounted on the housing 2. In the left lower portion of the housing 2 is disposed control means 8 for controlling the actions of various means in the image processing machine and the transmission and receiving of image signals when the image processing means functions as a facsimile machine. A detailed description of the control means 8 itself is omitted in the present specification because it has nothing directly to do with the novel features of the image processing machine of the invention. Construction of the document scanning means in its entirety The document scanning means 4 will be described in detail with reference to Figure 1. An opening extending in the widthwise direction (the direction perpendicular to the sheet surface in Figure 1) is formed at a predetermined site on the upper surface of the housing 2, and a first scanning zone 10 is defined by the opening. A second scanning zone 12 defined by a widthwise extending transparent plate (or slit) is disposed in the left side portion of the inside of the housing 2. First document illuminating means 14 is disposed within the housing 2 in relation to the first scanning zone 10, and second document illuminating means 16 is disposed in relation to the second document scanning zone 12. The first and second document illuminating means 14 and 16 include suitable lamps extending in the widthwise direction such as halogen lamps. Image-receiving means 18 is disposed nearly centrally in the housing 2. The image receiving means 18 may be constructed of a known optical reading device composed of an array of many suitable solid image pick-up elements such as CCD (where it is not necessary for the image processing machine to function as a facsimile machine, the image receiving means 18 may be comprised of an electrostatographic material used in ordinary copying machines). Within the housing 2 is also provided optical means shown generally at 20. The optical means 20 comprises a light path changing reflecting mirror 22, a first stationary reflecting mirror 24, a second stationary reflecting mirror 26 and a lens assembly 28. The light path changing reflecting mirror 22 is selectively held at a first position shown by a solid line and a second position shown by a two-dot chain line. When the light path changing reflecting mirror 22 is held at the first position, the first scanning zone 10 is optically connected to the image receiving means 18 via the light path changing reflecting mirror 22, the first stationary reflecting mirror 24, the second reflecting mirror 26 and the lens assembly 28. On the other hand, the light path between the second scanning zone 12 and the first reflecting mirror 24 is shut off by the light path changing reflecting mirror 22, and therefore, the second scanning zone 12 is not optically connected to the image receiving means 18. When the light path changing reflecting mirror 22 is held at the second position, the first scanning zone 10 fails to be connected optically to the first reflecting mirror 24 by the light path changing reflecting mirror 22, and consequently, the first scanning zone 10 is not optically connected to the image receiving means 18. On the other hand, the light path changing reflecting mirror 22 recedes from the light path between the second scanning zone 12 and the first reflecting mirror 24 and the second scanning zone 12 is connected optically to the image receiving means 18 via the first reflecting mirror 24, the second reflecting mirror 26 and the lens assembly 28. The structure of the optical means 20, particulary the structure of the light path changing reflecting mirror 22, will be described in detail hereinafter. In relation to the first scanning zone 10, there is provided first document scan moving means 29 including a movable document placing stand 30 disposed on the upper surface of the housing 2. With reference to Figures 1, 2 and 3, the movable document placing stand 30 includes a frame member 32, a transparent plate 34 and a document cover 36. As clearly shown in Figure 3, the frame member 32 is constructed of a plate-like member extending longitudinally (in the left-right direction in Figure 1 and in the direction perpendicular to the sheet surface in Figure 3) along the rear part of the upper surface of the housing 2. The transparent plate 34 is rectangular, and its rear edge portion is fixed to the frame member 32. The document cover 36 is mounted on the frame member 32 via suitable mounting means so as to be free to pivot between a closed position shown by a solid line in Figure 3 and an open position shown by a two-dot chain line in Figure 3 about a pivot axis extending along the rear end portion of the document cover 36. A rectangular elastic member 40 is fixed to the under surface of the main portion of the document cover 36. The movable document placing stand 30 as a whole is mounted on the upper surface of the housing 2 so as to be free to reciprocate across the first scanning zone 10, namely in the longitudinal direction (the left-right direction in Figure 1 and the direction perpendicular to the sheet surface in Figure 3). More specifically, as clearly shown in Figure 3, the frame member 32 is mounted longitudinally movably on the upper surface wall of the housing 2 via sliding means 42 which may be a sliding mechanism commercially available under the tradename "Aculide". A longitudinally extending guiding projection 44 is formed integrally in the front edge portion of the upper surface wall of the housing 2 and the front edge portion of the transparent plate 34 is supported slidably on the guiding projection 44. A forwardly projecting restraining member 46 is fixed to the front end portion (the left end portion in Figure 3) of the projection 44. The restraining member 46 needs not to extend over the entire length in the left-right direction in Figure 1 (the direction perpendicular to the sheet surface in Figure 3), and may extend over part of the entire length. A longitudinally extending member 48 to be restrained is fixed to the front edge portion of the transparent plate 34. The member 48 may be made of an iron plate, an aluminum plate or a plastic plate. It projects forwardly from the transparent plate 34 and a nearly L-shaped downwardly extending portion is formed integrally in its front end. The horizontal free end portion of the downwardly extending portion of the member 48 is positioned opposite to, and below, the undersurface of the free end of the restraining member 46. The restraining member 46 and the member 48 to be restrained cooperate with each other and prevent the front edge of the transparent plate 34 from being displaced upwardly when the movable document placing stand 30 moves longitudinally. Preferably, a low-friction member such as a plastic tape having a low coefficient of friction is adhered to the upper surface of the guiding projection 44 and the under surface of the free end of the restraining member 46. One example of the plastic tape is a plastic tape sold under the tradename "Bearee" by Toyo Bearing Co., Ltd. With reference to Figures 1 and 2, the document cover 36 of the movable document placing stand 30 has box-like projecting portions 52 and 54 formed integrally in its left and front end portion and its left and rear end portion. Between the projecting portions 52 nd 54 the left side surface 56 of the document cover 36 is inclined upwardly to the right from its lower end. The angle of inclination of the left side surface 56 may be about 25 to 35 degrees. A pair of width-restricting members 58 and 60 are mounted on the left side surface 56 so as to be free to move in the widthwise direction (the direction perpendicular to the sheet surface in Figure 1). The width-restricting members 58 and 60 have restriction wall portions 62 and 64 which are upstanding from the left side surface 56. These width-restricting members 58 and 60 are interlocked with each other by a known interlocking mechanism (disposed beneath the document cover 36 but not shown) which may be comprised of racks annexed to the width-restricting members and a pinion gear interposed between the racks. Conveniently, the width-restricting members 58 and 60 are moved simultaneously in a direction in which they come close to each other and in a direction in which they move away from each other. As will become clear from the description given hereinafter, the left side surface 56 and the pair of width-restricting members 58 and 60 function as a document insertion guiding passage for sheet-like documents to be conveyed through the second scanning zone 12. Furthermore, to the document cover 36 is fixed a sheet-like document supporting plate 66 having an upper surface which follows the left side surface 56 and extends inclinedly upwardly to the right. The movable document placing stand 30 is connected to document placing stand reciprocating means 68 (Figure 1) which may be an electric motor via a suitable power transmission mechanism (not shown), and is moved, as is required, by the means 68. In relation to the second scanning zone 12, second document scan moving means 70 is provided within the housing 2. The second document scan moving means 70 comprises a sheet-like document conveying passage 76 extending from a document insertion opening 72 formed in the left side portion of the upper surface wall of the housing 2 adjacent to the first scanning zone 10 to a document discharge opening 74 formed in the left side wall of the housing 2 across the second scanning zone 12 and sheet-like document conveying means for conveying a sheet-like document through the document conveying passage. As shown clearly in Figure 2, the document insertion opening 72 and the document discharge opening 74 are of a slender shape extending in the widthwise direction. The sheet-like document conveying passage 76 from the document insertion opening 72 to the document discharge opening 74 is defined by inside guiding plates 78 and 80 and outside guiding plates 84, 86 and 88. The transparent plate defining the second scanning zone 12 is fixed to an opening formed in the inside guiding plate 78. The sheet-like document conveying means 76 includes driven rollers 90, 92, 94, 96 and 98 and follower rollers 100, 102 and 104 cooperating with the driven rollers 94, 96 and 98. An introducing member 106 cooperating with the driven roller 90 and a separating member 108 cooperating with the driven roller 92 are further disposed. The introducing member 106 is formed of a flexible material such as a plastic film commercial available under the tradename "Lumirror", and its free end portion is pressed against the driven roller 90. The separation member 108 formed of synthetic rubber or the like having a high coefficient of friction is contacted at its acting surface with the driven roller 92. To the left side wall of the housing 2 is detachably mounted a sheet-like document receiving tray 110 extending to the left while being slightly upwardly inclined from below the document discharge opening 74. In relation to the upstream end portion and the downstream end portion of the sheet-like document conveying passage 76, there are provided a detector 112 for detecting the insertion of a sheet-like document into the sheet-like document conveying passage 76 and a detector 113 for detecting the discharge of the document from the document conveying passage 76. These detectors 112 and 113 may be microswitches having detecting arms projecting into the sheet-like document conveying passage 76. The operation of the document scanning means 4 described above will now be described. When one or more sheet-like documents are to be scanned, the second document scan moving means 70 can be used. In this case, a selection switch SS1 provided in an operating panel 114 (Figure 2) disposed in the front portion of the upper surface of the housing 2 is depressed. As a result, the movable document placing stand 30 is held at a rest position shown in Figures 2 and 4. When the document placing stand 30 is held at the rest position, the document insertion opening 72 of the sheet-like document conveying passage 76 is not covered with the document placing stand 30 but is exposed to view, as clearly shown in Figure 2. Moreover, the left side surface 56 (document insertion guiding passage) of the document cover 36 in the movable document placing stand 30 comes into alignment with the document insertion opening 72, and more specifically, the left side edge of the left side surface 56 matches, or approaches, the right side edge of the document insertion opening 72. Furthermore, when the selection switch SS1 is operated, the light path changing reflecting mirror 22 of the optical means 20 is held at the second position shown by a solid line in Figure 4 (by the two-dot chain line in Figure 1). Then, the widthwise distance between the width-restricting members 58 and 60 provided in the left side surface 56 is set at one corresponding to the width of the document to be scanned. The document to be scanned is placed with its surface downward on the left side surface 56 and the sheet-like document supporting plate 66 between the pair of width-restricting members 58 and 60, and as shown in Figure 4, inserted into the document conveying passage 76 through the document insertion opening 72 until its leading end portion comes to a predetermined position (a position upstream of the driven roller 102 and the separating member 108). Thereafter, a scan movement starting switch MS provided in the operating panel 114 (Figure 2) is depressed. As a result, the driven rollers 90, 92, 94, 96 and 98 are driven as is required to deliver documents one by one from the lowermost one through the document conveying passage 76, and discharge them onto the receiving tray 110 from the document discharge opening 74. The separating member 108 prevents two or more documents from being conveyed at a time. While the document is being conveyed through the sheet-like document conveying passage 76, the second document illuminating means 16 in the second scanning zone 12 illuminates the surface of the document and the light reflected from the surface of the document is projected onto the image receiving means 18 via the first stationary reflecting mirror 24, the second stationary reflecting mirror 26 and the lens assembly 28. The image receiving means 18 produces an electrical signal in responce to the projected light. This electrical signal is transmitted to a receiver when the image-processing machine is used as a facsimile machine, or fed into the image-forming means 6 (more specifically its printing head) when it is used as a copying machine. When the document to be scanned is not sheet-like but is of another form such as a book, the second document scan moving means 70 cannot be used. The first document scan moving means 29, however, can be used not only when the document to be scanned is a sheet-like document but also when it is a book, for example. To use the first document scan moving means 29, a selection switch SS2 provided in the operating panel 114 (Figure 2) is operated. As a result, the movable document placing stand 30 is held at a start-of-scan position shown in Figure 1, and the light path changing reflecting mirror 22 of the optical means 20 is held at the first position shown by the solid line in Figure 1. When the document placing stand 30 is held at the start-of-scan position, the document insertion opening 72 formed on the upper surface wall of the housing 2 is covered with the document placing stand 30. Then, the document cover 36 is pivoted to the open position shown by the two-dot chain line in Figure 3 and the document is placed with its surface downward on a predetermined site of the transparent plate 34. The document cover 36 is then again returned to the closed position to cover the transparent plate 34 and the document placed on it. Then, the scan movement starting switch MS is operated, whereupon the movable document placing stand 30 is moved to a predetermined position to the left in Figure 1 and then moved back to the start-of-scan position to the right in Figure 1. During the movement of the document placing stand 30 to the left, the first document illuminating means 14 in the first scanning zone 10 illuminates the surface of the document on the transparent plate 34, and the light reflected from the surface of the document is projected onto the image receiving means 18 via the light path changing reflecting mirror 22, the first stationary reflecting mirror 24, the second stationary reflecting mirror 26 and the lens assembly 28. The image receiving means 18 produces an electrical signal according to the light projected. Detailed Description of Preferred Embodiments Preferred embodiments of the image processing machine of this invention will be described in detail with reference to the accompanying drawings 5 to 17. Figs. 5 to 9 illustrate a first embodiment of the invention. With reference to Figures 5 and 6, the movable document placing stand generally shown at 230 includes a frame 232, a transparent plate 234 and a document cover 236. The frame 232 has a plate-like portion (see Figure 3 also) extending longitudinally (in the left-right direction in Figure 5) along the rear portion of the upper surface of the housing 2 and sheet-like document insertion guiding portion 240 formed integrally with the plate-like portion and extending laterally (in the direction perpendicular to the sheet surface in Figure 5) along the left side portion of the document stand 230. Box-like projecting portions 242 and 244 are provided in the front end portion and the rear end portion respectively of the insertion guiding portion 240. Between the box-like projecting portions 242 and 244 an elongate insertion opening 246 extending in widthwise direction is formed in the insertion guiding portion 240. An inclined wall 248 is formed which extends inclinedly to the right and upwardly from the right side edge of the insertion opening 246. The angle of inclination of the inclined wall 248 may be about 25 to 30 degrees. As shown in Figure 5, in the left side of the insertion opening 246 is formed a wall 250 which extends nearly parallel to the inclined wall 248 from the left side edge of the insertion opening 246 upwardly and inclinedly to the right and then extends upwardly in a substantially vertical fashion. A pair of width regulating members 258 and 260 corresponding to the pair of width regulating members 58 and 60 in the movable document placing stand shown in Figure 2 are mounted on the inclined wall 248 so as to be free to move in the widthwise direction. The insertion opening 246, the inclined wall 248 and the pair of width regulating members 258 and 260 function as a document insertion guiding path. Further, between the box-like protruding portions 242 and 244 is mounted a sheet-like document supporting plate 266 so as to be free to pivot between an operative position shown in Figures 5 and 6 and by a solid line in Figure 9 and an in-operative position shown in Figures 7 and 8 and by a two-dot chain line in Figure 9. It will be appreciated by reference to Figures 6 and 9 that upstanding pieces 268 and 270 are formed integrally on the two side edges of the front end portion (the left end portion) of the sheet-like document supporting plate 266, and by mounting short rods formed on the outside surfaces of the upstanding pieces 268 and 270 on the upstanding inside walls of the box-like projecting portions 242 and 244, the sheet-like document supporting plate 266 is mounted between the box-like projecting portions 242 and 244. As clearly shown in Figure 9, a downwardly extending piece 272 is formed in the front end (left end) of the sheet-like document supporting plate 266, and an abutting wall 274 extending to the right and downwardly inclinedly is formed in the sheet-like document insertion guiding portion 240. When the sheet-like document supporting plate 266 is brought to the operative position, the downwardly extending piece 272 abuts with the abutting wall 274 thereby to hamper further pivoting of the document supporting plate 266 in the clockwise direction in Figure 9 and the sheet-like document supporting plate 266 is held at the operative position. When the document supporting plate 266 is held at the operative position, its upper surface follows the upper surface of the inclined wall 248 and extends upwardly to the right, as will be seen from Figures 5 and 6. On the other hand, when the document supporting plate 266 is brought to the inoperative position, the upstanding pieces 268 and 270 of the sheet-like document supporting plate 266 abut with the upper surface of the left side portion of the document insertion guiding portion 240 to hamper further pivoting of the document supporting plate 266 in the counterclockwise direction in Figure 9, and the supporting plate 266 is held at the inoperative position. When the document supporting plate 266 is held at the inoperative position, the document insertion guiding path defined by the insertion opening 246, the inclined wall 248 and the pair of width regulating members 358 and 260 is covered with the sheet-like document supporting plate 266. With reference to Figure 9, a lever member 278 is pivotally set up by a pin 276 within the box-like projecting portion 244. One end portion (upper end portion) 280 of the lever member 278 extends forwardly in the widthwise direction, passes through an opening formed in the upstanding inside wall of the box-like projecting portion 244, and projects forwardly thereof, as shown in Figure 6. A tension spring 282 is stretched between the lever member 278 and the upper wall of the box-like projecting portion 244. The tension spring 282 elastically biases the lever member 278 counterclockwise and holds it at a position shown by the solid line. On the other hand, an opening 284 is formed in the upper surface wall of the housing 2, and a detector 286 which may be a microswitch is disposed within the housing 2 in correspondence to the opening 284. When the sheet-like document supporting plate 266 is held at the operative position, the lever member 278 is held at the position shown by the solid line by the elastic biasing action of the tension spring 282. In this state, the other end portion 289 (lower end portion) of the lever member 278 gets into the opening 284 to close the detector 286. On the other hand, when the sheet-like document supporting plate 266 is held at the inoperative position shown by a two-dot chain line, the upstanding piece 270 of the document supporting plate 266 abuts with the one end portion 280 of the lever member 278 and pivots the lever member 278 clockwise to a position shown by the two-dot chain line against the elastic biasing action of the tension spring 282. As a result, the other end portion 289 of the lever member 278 moves away upwardly from the opening 284 to release the detector 286 and thereby permit movement of the movable document placing stand 230. In other words, when the detector 286 is closed, movement of the document placing stand 230 is electrically hampered. With reference to Figure 8, the rectangular document cover 236 is disposed on the right of the insertion guiding portion 240, and mounted on the plate-like portion of the frame 232 via suitable mounting means in such a manner that it is free to pivot between a closed position shown by the solid line and an open position shown by the two-dot chain line about a pivot axis extending along its rear edge portion. A rectangular elastic member 288 is fixed to the under surface of the document cover 236. It will be understood by reference to Figures 5 and 6 together with Figures 7 and 8 that when the sheet-like document supporting plate 266 is held at the inoperative position, the document cover 236 can be freely opened or closed without being interfered by the document supporting plate 266, but that when it is held at the operative position, it interferes with the pivoting of the document cover 236 from the closed position toward the open position. The rectangular transparent plate 234, like the transparent plate 34 in the document placing stand 30 shown in Figures 1 to 4, is fixed at its rear edge portion to the plate-like portion of the frame member 232. The movable document placing stand 230 as a whole is mounted on the upper surface wall of the housing 2 so as to be free to move in the left-right direction in Figures 5 and 6 by substantially the same method as in the case of the document placing stand 30 shown in Figures 1 to 4, and can be moved by the reciprocating means 68 (Figure 1). When the second document scan moving means 70 is to be used in the document scanning means 4 provided with the movable document placing stand 230 described above, the document placing stand 230 is held at a stop position shown in Figures 5 and 6 (which corresponds to the start-of-scan position). It will be appreciated by reference to Figure 5 that in this state, the insertion opening 246 formed in the insertion guiding portion 240 is kept in alignment with the document insertion opening 72 (see Figure 2 also) formed in the upper surface wall of the housing 2. The sheet-like document supporting plate 266 is held at the operative position shown in Figures 5 and 6. Accordingly, the detector 286 (Figure 9) is closed, and the movable document placing stand 230 cannot be moved by the reciprocating means 68 (Figure 1). The operator is accurately prevented from undergoing injury when he moves the document placing stand 230 while inserting his hand into the document insertion hole 72 in the housing 2 through the insertion opening 246 formed in the insertion guiding portion 240. It is also possible to prevent a sheet-like document from being damaged when the movable document placing stand 230 is moved while the document is inserted in the insertion opening 240 or the document insertion opening 72. Then, as in the case of the movable document placing stand 30 shown in Figures 1 to 4, the widthwise distance between the width regulating members 258 and 260 is prescribed at a value corresponding to the width of the sheet-like document. The document to be scanned is placed with its surface downward on the inclined wall 248 and the sheet-like document supporting plate 266 between the pair of width regulating members 258 and 260, and inserted into the sheet-like document conveying passage 76 through the insertion opening 246 and the document insertion opening 72 so that its leading end portion reaches a predetermined position (upstream of the driven roller 92 and the separating member 108). Thereafter, the scan movement starting switch MS in the operation panel 114 (Figure 6) is operated to start to convey the document. When the first document scan moving means 29 is to be used, the sheet-like document supporting plate 266 is held at the inoperative position shown in Figures 7 and 8. This results in covering of the document insertion guiding passage defined by the insertion opening 246, the inclined wall 248 and the width regulating members 258 and 260 with the sheet-like document supporting plate 266. This can prevent erroneous insertion of a document or the operator's hand into the document insertion guiding passage. The detector 286 (Figure 9) is released, and the movable document placing stand 230 is in condition for movement. Then, the document cover 236 is pivoted to the open position shown by the two-dot chain line in Figure 8 and the document is placed with its surface downward at a predetermined position on the transparent plate 234. If at this time, the sheet-like document supporting plate 266 is at the operative position, the supporting plate 266 interferes with the opening movement of the document cover 236. Accordingly, it is possible to surely prevent opening movement of the document cover 236 while the sheet-like document supporting plate 266 is not held at the inoperative position. The scan movement start switch MS is then depressed whereby the movable document placing stand 230 is moved, for example, to the position shown by a two-dot chain line in Figure 7 and then moved back to the position shown by a solid line in Figure 7. Embodiment II Figs. 10 to 12 show a modified embodiment of the invention. This modified embodiment has resulted from making the following changes or modifications in the apparatus shown in Figs. 1 to 4. With reference to Figures 10 to 12, particularly Figure 11, in the movable document placing stand shown generally at 330, a sheet-like document supporting plate 366 is mounted between box-like projecting portions 352 and 354 formed in a document cover 336 in such a manner that it is free to pivot between an operative position shown in Figures 10 and 11 and an inoperative position shown in Figure 12. More specifically, upstanding pieces 368 and 370 are formed integrally on the two side edges of the document supporting plate 366, and short rods 372 (Figure 11 shows only the short rod 372 formed in the upstanding piece 368) are formed on the outside surfaces of the upstanding pieces 368 and 370. The sheet-like document supporting plate 366 is mounted between the box-like projecting portions 352 and 354 by securing these short rods 372 pivotally to the upstanding inside walls of the box-like projecting portions 352 and 354. The document supporting plate 366 extends to a site abutting with the upper surface wall of the housing 2 when it is held at the operative position shown in Figures 10 and 11. A pair of width regulating members 358 and 360 corresponding to the pair of width regulating members 58 and 60 in the movable document placing stand 30 shown in Figure 2 are mounted for free widthwise movement on the forward extending portion 374 of the document supporting plate 366. Accordingly, in the modified embodiment shown in Figures 10 to 12, the upper surface of the forward extending portion 374 of the document supporting plate 366 and the pair of width regulating members 358 and 360 define a document insertion guiding passage. A magnetic member 367 such as an iron plate is embedded in the under surface of the forward extending portion of the document supporting plate 366, and a permanent magnet 369 is embedded at a corresponding site in the document cover 336. When the document supporting plate 366 is brought to the operative position shown in Figures 10 and 11, the magnetic member 367 is attracted to the permanent magnet 369 to hamper further counterclockwise rotation of the document supporting plate 366 in Figure 10. The document supporting plate 366 is thus held at the operative position. When the document supporting plate 366 is held at the inoperative position shown in Figure 12, the under surface of the rear portion of the document supporting plate 366 abuts with the upper surface of the main portion of the document cover 336 to hamper further clockwise pivoting of the document supporting plate 366 in Figure 12. The document supporting plate 366 is held at the inoperative position. An opening-closing member 376 is mounted by suitable mounting means under the upper surface wall of the housing 2 so that it is free to move substantially horizontally between an open position shown in Figures 10 and 11 and a closed position shown in Figure 12. As clearly shown in Figure 11, the opening-closing member 376 is comprised of a plate-like member having formed in its right half a rectangular notch 378 of a shape corresponding to the document insertion opening 72 formed in the upper surface wall of the housing 2. When the opening-closing member 376 is held at the open position, the notch 378 is in alignment with the document insertion opening 72, and therefore, the document insertion opening 72 remains open. When the opening-closing member 376 is held at the closed position, the left half of the opening-closing member 376 is in alignment with the document insertion opening 72 to close it. Downwardly extending pieces 380 are formed at both side edges of the opening-closing member 376, and to each of these downwardly extending pieces 380 is connected one end of a tension spring 382 having the other end fixed to a suitable site within the housing 2. (Figure 11 shows only one downwardly extending piece 380 and one tension spring 382.) The tension springs 382 elastically bias the opening-closing member 376 to the above closed position. Further with reference to Figure 11, interlocking means shown generally at 310 is disposed between the sheet-like document supporting plate 366 and the opening-closing member 376. An arcuate piece 312 extending from the front edge of the forward end of the document supporting plate 366 is formed integrally with the supporting plate 366. An input rack 311 is formed on the outer circumferential surface of the arcuate piece 312, and an output rack 316 is formed in the front edge part of the right half of the opening-closing member 376 within the housing 2, gears 318, 320 and 322 are rotatably mounted. The gears 318 and 320 rotate as a unit, and the gear 320 is in mesh with the gear 322. The gear 322 is in mesh with the output rack 316. It will be understood by comparing Figure 12 with Figures 10 and 11 that when the document supporting plate 366 is pivoted from the inoperative position shown in Figure 12 to the operative position shown in Figures 10 and 11, the input rack 314 comes into mesh with the gear 314 and rotates it in the latter half of the pivoting movement, and that the pivoting movement of the document supporting plate 366 is transmitted to the opening-closing member 376 via the input rack 314, the gears 318, 320 and 322 and the output rack 316 to move the opening-closing member 376 from the closed position to the open position. When the document supporting plate 366 is pivoted from the operative position to the inoperative position, the input rack 314 is in mesh with the gear 318 in the first half of this pivoting movement. Hence, the pivoting movement of the document supporting plate 366 is transmitted to the opening-closing member 376 via the input rack 314, the gears 318, 320 and 322 and the output rack 316 to move the opening-closing member 376 from the open position to the closed position. As clearly shown in Figure 11, a detector 386 which may be a microswitch is also provided within the housing 2. When the document supporting plate 366 is held at the inoperative position, the detector 386 is released. When it is held at the operative position, the free end of the arcuate piece 312 formed in it acts on the detector 386 to close it. While the detector 286 is released, the movable document placing stand 330 can be moved, but when it is closed, the movement of the movable document placing stand 330 is electrically hampered. When the second document scan moving means 70 is used in the document scanning means 4 provided with the movable document placing stand 330 described above, the stand 330 is held at the stop position shown in Figures 10 and 11 (which is identical with the start-of-scan position), and the document supporting plate 366 is held at the operative position shown in Figures 10 and 11. In this state, the document supporting plate 366 extends upwardly, and is inclined to the right, from its forward end located at or near the right side edge of the document insertion opening 72 formed in the upper surface wall of the housing 2. The angle of inclination of the upper surface of the document supporting plate 366 may be about 25 to 35 degrees. When the document supporting plate 366 is held at the operative position, the detector 386 is closed to make it impossible to move the document placing stand 330 by the reciprocating means 68 (Figure 1). Accordingly, the operator's hand is accurately prevented from undergoing injury when the operator moves the document placing stand 330 while his hand is inserted in the document insertion opening 72. Furthermore, the sheet-like document is accurately prevented from being damaged when the document placing stand 330 is moved while the document is inserted in the document insertion opening 72. Thereafter, as in the case of the movable document placing stand 30 shown in Figures 1 to 4, the widthwise distance between the pair of width regulating members 358 and 360 is prescribed at a value corresponding to the width of the sheet-like document to be scanned. The document to be scanned is placed with its surface downward on the document supporting plate 366 between the width regulating members 358 and 360, and inserted into the document conveying passage 76 through the document insertion opening 72 until its leading end reaches a predetermined position (upstream of the driven roller 92 and the separating member 108). Then, the scan movement starting switch MS in the operating panel 114 (Figure 11) is depressed to start conveying of the document. When the first document scan moving means 29 is to be used, the document supporting plate 366 is brought to the inoperative position shown in Figure 12. As a result, the opening-closing member 376 is moved to the closed position to close the document insertion opening 72. Hence, the insertion of a document or the operator's hand into the document insertion opening 72 by error can be prevented. Moreover, the detector 386 is open and the document placing stand 330 is in condition for movement. Then, the document cover 336 is opened, and the document is placed with its surface downward at a predetermined position on the transparent plate 334. The document cover 336 is then returned to the closed position, and the scan movement starting switch MS is depressed. As a result, the movable document placing stand 330 is moved to the left in Figure 12 to a predetermined position and moved back to the position shown in Fig. 12. Embodiment III Figs. 13 to 16 and 17-A and 17-B show another modified embodiment of the invention. This modified embodiment result result from making the following changes or modifications in the embodiment illustrated in Figures 1 to 4. As clearly shown in Figures 15 and 16, in the movable document placing stand 430, an inclined left side surface 456 existing between box-like projecting portions 452 and 454 formed in a document cover 436 is not on the same plane as the inclined upper surface of a sheet-like document supporting plate 466 fixed to its rear (right side) but is displaced downward by a predetermined amount with respect to the inclined upper surface of the document supporting plate 466. Hence, a stepped portion 468 exists between the inclined upper surface of the document supporting plate 466 and the inclined left side surface 456. As clearly shown in Figures 14 and 16, a relatively large rectangular opening 411 is formed in the left side part of the upper surface wall of the housing 2. A plate-like member 413 located beneath the upper surface wall of the housing 2 by a predetermined distance projects to the right from the left side wall of the housing 2. The plate-like member 413 is formed integrally with the left side wall of the housing 2, or may be separately formed and fixed to a predetermined position. The free edge, or the right side edge, of the plate-like member 413 is spaced to the left a predetermined distance from the right side edge of the opening 411, and therefore, the right side part of the opening 411 is open without being closed by the plate-like member 413. This open part of the opening 411 defines a document insertion opening 472. A sheet-like document guiding member 415 is mounted on the upper surface of the housing 2 so as to be free to move between an operative position shown by a solid line in Figure 16 and an inoperative position shown by a two-dot chain line in Figure 16. The sheet-like document guiding member 415 may be in the form of a thin-walled box. The method of mounting the document guiding member 415 will be described with reference to Figure 16. A short rod 417 projecting inwardly is formed in both the front portion and the rear portion of the inside of the housing 2. An elongate slot 419 is formed in each of the front wall and the rear wall of the document guiding member 415. By inserting the short rods 417 into the slots 419, the document guiding member 415 is mounted on the short rods 417. A protrusion 421 is formed in each of the front wall and the rear wall of the document guiding member 415, and spring means 423 which may be a tension coil spring is stretched between each protrusion 421 and each short rod 417. As clearly shown in Figures 17-A and 17-B, one end surface 425 of the document guiding member 415 is formed in an arcuate shape, and correspondingly to it, a receiving portion 437 having an arcuate part 429, a straight line part 431, a straight line part 433 and an arcuate part 435 is formed in a front upstanding base plate and a rear upstanding base plate disposed within the housing 2. The receiving portion 437 functions as locking means for releasably locking the document guiding member 415 in the operative position and the inoperative position. When the document guiding member 415 is held at the operative position, one arcuate end surface 425 of the document guiding member 415 is received in the arcuate part 429 of the receiving portion 437, and a flat surface 439 following the end surface 425 abuts with the straight line part 431 of the receiving portion 437. Since the flat surface 439 and the straight line part 431 exist below the short rod 417, the abutting of the flat surface 439 with the straight line part 431 hampers the counterclockwise pivoting of the document guiding member 415 about the short rod 417 in Figure 17-A. On the other hand, the clockwise pivoting of the document guiding member 415 is hampered by abutting with the inclined left side surface 456 of the document cover 438, as can be understood from Figure 16. Thus, the document guiding member 415 is locked in the operative position. The document guiding member 415 may be brought from the operative position to the inoperative position by moving the document guiding member 415 upwardly to the right against the elastic biasing action of the spring means 423 as shown by a two-dot chain line in Figure 17-A to move the flat surface 439 away from the straight line part 431, and thereafter pivoting it counterclockwise. When the document guiding member 415 is held at the inoperative position as shown in Figure 17-B, the document guiding member 415 is forced toward the right by the elastic biasing action of the spring member 423. Consequently, its arcuate end surface 425 is received in the arcuate part 435 of the receiving portion 437 and the flat surface 441 following the end surface 425 abuts with the straight line part 433 of the receiving portion 437. Since the flat surface 441 and the straight line part 433 exist right of the short rod 417, the abutting of the flat surface 441 with the straight line part 433 hampers the clockwise pivoting of the document guiding member 415 about the short rod 417 in Figure 17-B. On the other hand, the counterclockwise pivoting of the document guiding member 415 is hampered by abutting with the plate-like member 413, as can be understood from Figure 16. Thus, the document guiding member 415 is locked in the inoperative position. The document guiding member 415 may be brought from the inoperative position to the operative position by moving the document guiding member 415 to the left against the elastic biasing action of the spring means 423 as shown by a two-dot chain line in Figure 17-B to move the flat surface 441 away from the straight line part 433, and then pivoting it clockwise. It will be appreciated by reference to Figures 13 and 14 which show the document guiding member 415 as it is held at the operative position that when the document guiding member 415 is held at the operative position, its upper surface is substantially on the same plane as the inclined upper surface of the document supporting plate 466 existing rearwardly thereof (on the right hand side thereof). As shown in Figure 14, a pair of width regulating members 458 and 460 which correspond to the pair of width regulating members 58 and 60 in the movable document placing stand 30 illustrated in Figure 2 are mounted movably in the widthwise direction on the upper surface of the document guiding member 415. In this modified embodiment, the upper surface of the document guiding member 415 held at the operative position and the pair of width regulating members 458 and 460 define a document insertion guiding passage. On the other hand, as can be seen by reference to Figures 15 and 16, when the document guiding member 415 is held at the inoperative position, a document insertion opening 472 existing in the upper surface wall of the housing 2 is covered with the document guiding member 415. Since the document guiding member 415 does not project upwardly beyond the upper surface wall of the housing 2, the movable document placing stand 430 can move to and from in Figure 15 over the document guiding member 415 without being interfered by the guiding member 415. As Figures 14 and 16 clearly show, a detector 486 which may be a reed switch is embedded in the plate-like member 413. An actuator 488 which may be a magnet is embedded in the document guiding member 415. When the document guiding member 415 is at the operative position, the detector 486 is released. But when the document guiding member 416 is held at the inoperative position, the detector 486 is closed by the actuator 488. When the detector 486 is released, movement of the movable document placing stand 430 is electrically hampered, and when the detector 486 is closed, the movable document placing stand 430 is in condition for movement. When the second document scan moving means 70 is used in the document scanning means provided with the movable document placing stand 430 described above, the document placing stand 430 is held at the stop position shown in Figures 13 and 14 (which is identical with the start-of-scan position). The sheet-like document guiding member 415 is held at the operative position shown in Figures 13 and 14. In this state, the upper surface of the document guiding member 415 and the upper surface of the document supporting plate 466 which are substantially on the same plane extend upwardly and are inclined to the right from their front ends located at or near the right side edge of the document insertion opening 472 formed in the upper surface wall of the housing 2. The angles of inclination of the upper surface of the document guiding member 415 and the upper surfce of the document supporting plate 466 may be about 25 to 35 degrees. When the document guiding member 415 is held at the operative position, the detector 486 is released, and therefore, the movable document placing stand 430 cannot be moved by the reciprocating means 68. Accordingly, the operator's hand can be accurately prevented from undergoing injury when the operator moves the document placing stand 430 while his hand is inserted in the document insertion opening 472. Moreover, a sheet-like document can be accurately prevented from being damaged when the movable document placing stand 430 is moved while the document is inserted in the document insertion opening 472. Then, as in the case of the movable document placing stand 30 illustrated in Figures 1 to 4, the widthwise distance between the pair of width regulating members 458 and 460 is prescribed at a value corresponding to the width of the sheet-like document to be scanned. The document to be scanned is placed with its surface downward on the document guiding member 415 and the document supporting plate 466 between the pair of width regulating members 458 and 460, and as shown in Figure 13, inserted into the sheet-like document conveying passage 76 through the document insertion opening 472 until its leading end portion reaches a predetermined position (upstream of the driven roller 92 and the separating member 108). Thereafter, the scan movement starting switch MS in the operating panel 114 (Figure 14) is depressed to start conveying of the document. When the first document scan moving means 29 is to be used, the document guiding member 415 is held at the inoperative position shown in Figure 15. As a result, the document insertion opening 472 is covered with the document guiding member 415. Hence, the insertion of a document or the operator's hand in the document insertion opening 472 by error can be prevented. Furthermore, the detector 486 is closed to permit movement of the movable document placing stand 430. Then, the document cover 436 is opening and the document is placed with its surface downward at a predetermined position on the transparent plate 434. The document cover 436 is then returned to the closed position. When at this time, the document guiding member 415 is held not at the inoperative position but at the operative position, the document guiding member 415 interferes with the opening movement of the document cover 430. Therefore, the operator is accurately prevented from opening the document cover 436 while forgetting to hold the document guiding member 415 at the inoperative position. Thereafter, the scan movement starting switch MS is operated. As a result, the movable document placing stand 430 is moved to the left in Figure 15 to a predetermined position and then moved back to the position shown in Figure 15. While the invention has been described in detail hereinabove with reference to the specific embodiments of the image processing machine constructed in accordance with this invention taken in conjunction with the accompanying drawings, it should be understood that the invention is not limited to these specific embodiments and various changes and modification are possible without departing from the scope of the invention described and claimed herein.

Claims: An image processing machine provided with a housing (2) having a substantially horizontal upper surface, and with means for scanning a document; said scanning means comprising a first scanning zone (10) disposed on the upper surface of the housing (2), a second scanning zone (12), image receiving means (18), optical means (20) for connecting the first scanning zone (10) or the second scanning zone (12) optically to the image receiving means (18), and second document scan moving means (70) for moving the document across the second scanning zone (12); said second document scan moving means (70) comprising a sheet-like document conveying passage (76) and means for conveying a sheet-like document through the sheet-like document conveying passage (76), said passage extending from the document insertion opening (72) arranged on the upper surface of the housing (2) to a document discharge opening (74) on one side surface of the housing via the second scanning zone inside the housing; characterized by first document scan moving means (29) for moving the document across the first scanning zone (10), comprising a document placing stand (230) mounted on the upper surface of the housing (2) so as to be reciprocably movable across the first scanning zone (10) a transparent plate (234) for placing the document thereon, and means (68) for reciprocating the document placing stand (230); the movable document placing stand (230) including a frame member (232) to which: is fixed said transparent plate (234), is annexed a document insertion guiding passage (56), is mounted a document cover (236) to be freely pivotable between a closed position and an open position, and is mounted a sheet-like document supporting plate (266) to be freely pivotable between an operative position in which it extends inclinedly upwardly from the document insertion passage (56); the document insertion guiding passage (56) being aligned with the document insertion opening (72) to permit a sheet-like document to be inserted into the opening (72) through the passage (56) when the document placing stand (230) is in a predetermined position. Image processing machine according to claim 1, characterized in that when the sheet-like document supporting plate (266) is held at the operative position, it exists above the document cover held at the closed position and interferes with the opening movement of the document cover (236), and when it is held at the inoperative position, it no longer interferes with the opening movement of the document cover. Image processing machine according to claim 1 or 2, characterized by safety means including a detector (286) which detects whether the sheet-like document supporting plate (266) is held at the inoperative position, said safety means permitting operation of the reciprocating means (68) over the first document scan moving means (29) only when the detector detects the inoperative position of the sheet-like document supporting plate. An image processing machine provided with a housing (2) having a substantially horizontal upper surface, and with means for scanning a document; a document insertion guiding passage (56) formed in a movable document placing stand (30, 230, 330, 430), which is in alignment with the document insertion opening (72) to permit a sheet-like document to be inserted into the document insertion opening (72) through the document insertion guiding passage when the movable document placing stand (30, 230, 330, 430) is held at a predetermined position; a sheet-like document supporting place (66, 266, 366, 466) extending inclinedly upwardly from the document insertion guiding passage (56) which is mounted on the movable document placing stand (330) for free pivotable movement between an operative position and an inoperative position; an opening closing member (376) mounted for free movement between a closed position at which it closes the document insertion opening (72) and an open position at which it leaves the document insertion opening open, which is disposed within the housing (2); and interlocking means (310) which when the sheet-like document supporting plate (366) is held at the operative position while the document placing stand (330) is at the said predetermined position, brings the opening-closing member (376) to the open position and when the sheet-like document supporting plate (366) is held at the inoperative position, brings the opening-closing member (376) to the closed position. Image processing machine according to claim 3 or 4, characterized in that the sheet-like document supporting place (366) is mounted on the document cover (336), and when it is held at the inoperative position, it extends along the upper surface of the document cover held at the closed position. An image processing machine provided with a housing (2) having a substantially horizontal upper surface, and with means for scanning a document; a movable document placing stand (430) deviating from a document insertion opening (472) without covering it when held at a predetermined position; and a sheet-like document guiding member (415) mounted in the upper portion of the housing (2) for free pivoting between an operative position at which it extends inclinedly upwardly from the document insertion opening (72) and an inoperative position at which it closes the document insertion opening (72), the document placing stand (430) being free to reciprocate above the sheet-like document guiding member (415) without being interfered by it when the guiding member (415) is held at the inoperative position. Image processing machine according to one of claims 4 or 6, characterized by safety means including a detector (386) which detects whether the opening-closing member (376) is held at the closed position, said safety means permitting operation of the reciprocating means (68) of the first document scan moving means (29) only when the detector detects the closed position of the opening-closing member. An image processing machine provided with a housing (2) having a substantially horizontal upper surface, and with means for scanning a document; said scanning means comprising a first scanning zone (10) disposed on the upper surface of the housing (2), a second scanning zone (12), image receiving means (18), optical means (20) for connecting the first scanning zone (10) or the second scanning zone (12) optically to the image receiving means (18), and second document scan moving means (70) for moving the document across the second scanning zone (12); said second document scan moving means (70) comprising a sheet-like document conveying passage (76) and means for conveying a sheet-like document through the sheet-like document conveying passage (76), said passage extending from the document insertion opening (74) arranged on the upper surface of the housing (2) to a document discharge opening (74) on one side surface of the housing via the second scanning zone inside the housing; characterized by first document scan moving means (29) for moving the document across the first scanning zone (10) comprising a document placing stand (430) mounted on the upper surface of the housing (2) so as to be reciprocably movable across the first scanning zone (10) a transparent plate (434) for placing the document thereon, and means (68) for reciprocating the document placing stand (430); said movable document placing stand (430) deviating from the document insertion opening (472) without covering it when held at a predetermined position; and the sheet-like document guiding member (415) mounted in the upper portion of the housing (2) for free pivoting between an operative position at which it extends inclinedly upwardly from the document insertion opening (72) and an inoperative position at which it closes the document insertion opening (72), the document placing stand (430) being free to reciprocate above the sheet-like document guiding member (415) without being interfered by it when the guiding member (415) is held at the inoperative position. Image processing machine according to claim 8, characterized in that the sheet-like document guiding means (415) is mounted for free movement over a predetermined range along its extending direction and elastically biased on one side in its extending direction by spring means (423); and locking means is disposed which hampers the pivoting of the sheet-like document guiding member (415) from the operative position to the inoperative position and its pivoting from the inoperative position to the operative position unless the sheet-like document guiding member (415) is moved to the other side in its extending direction against the elastic biasing action of the spring means.

Inventors: ABE YUJI, HASHIZUME MASAHIRO, JINNO TAIICHI, NAGATA KATSUMI, NAKAMURA KAZUO, SAKAUE KENJI, ABE, YUJI, HASHIZUME, MASAHIRO, JINNO, TAIICHI, NAGATA, KATSUMI, NAKAMURA, KAZUO, SAKAUE, KENJI
Applicants: MITA INDUSTRIAL CO LTD, MITA INDUSTRIAL CO. LTD.
Application year: 1988
Main classification: H04N1
IPC codes: H04N1, G03G15