Cleaning device for an image-forming machine

Abstract: A cleaning device (212) for an image-forming machine comprises a supporting frame structure (202) including a toner recovery box receiving space (262) extending in the front-rear direction, an actuating element, and a toner recovery box (264) adapted to be withdrawably inserted into said receiving space (262), said recovery box (264) comprising a box having a toner inlet (334) extending in the front-rear direction, a cover member (350) mounted on the box (264) so as to be free to move between a closed position at which it closes the toner inlet (334) and an open position at which it exposes the toner inlet (334) elastic means for elastically biasing the cover member (350) to the closed position and a non-actuating element provided in the cover member; wherein the actuating element and the non-actuating element are constructed such that when the toner recovery box (264) is inserted into the receiving space (262), the actuating element acts on the non-actuating element to move the cover member (350) to the open position against the biasing force of the elastic means.

Description: The invention relates to a cleaning device for an image-forming machine according to the preamble of claim 1. Such a device is known from JP-58-179886. Such a cleaning device removes residual toner from the surface of a photosensitive material in an image-forming machine such as an electrostatic copying machine. In an image-forming machine such as an electrostatic copying machine, a latent electrostatic image is formed on the surface of a photosensitive material disposed on a rotating drum or an endless belt and then developed to a toner image. Then, the toner image is transferred to a receptor sheet such as ordinary paper, and for the next cycle of image formation, the toner image remaining on the surface of the photosensitive material is then removed. The cleaning device used to remove the residual toner from the surface of the photosensitive material should be provided with toner holding means for holding the removed toner as well as means for removing the residual toner from the surface of the photosensitive material. On the other hand, in a small-sized and low-priced image-forming machine, it has been proposed to construct a rotating drum having a photosensitive material disposed on its peripheral surface and various elements positioned around it such as a cleaning device as a unit and to mount such a unit replaceably on the image-forming machine. Such a unit system has already gained commercial acceptance. In an image-forming machine of the unit type, if the toner holding capacity of the toner holding means in the cleaning device is made sufficiently large with respect to the effective life of the photosensitive material, it is possible to use the photosensitive material until the end of the effective life, then replace the whole unit with a new one, and discard the old one. However, to increase the toner holding capacity of the toner holding means sufficiently greatly as above necessarily results in a bulky cleaning device, and it is impossible to reduce the size of the unit and therefore, the size of the image-forming machine on which the unit is to be mounted. Irrespective of whether the cleaning device is constructed as a unit with the rotating drum, etc., the size reduction of the image-forming machine desirably requires the size reduction of the toner holding means in the cleaning device. However, when the size of the toner holding means is reduced, the toner holding capacity naturally decreases. In such a case, when the toner holding means has been filled up with toner it is necessary to suspend the use of the image-forming machine and to recover the toner. To recover the toner conveniently in this case, it has already been proposed to construct a detachable toner recovery box as the toner holding means, and to replace it with a new toner recovery box when it is filled up with the toner, and such toner holding means has already come into commercial use. In the cleaning device provided in a small-sized and low-priced image-forming machine, it is desired to omit a relatively complex and expensive helical vane mechanism and the like for forwardly or rearwardly transferring the toner removed from the photosensitive member. It is important in this case to use a toner recovery box of a type having a toner inlet extending in the front-rear direction along the photosensitive material in order to recover the toner sufficiently uniformly throughout the toner recovery box. When a toner recovery box of such a type is used, the toner frequently scatters from the toner inlet, and contaminates the surrounding environment or the operator's hands and garment, etc., during or after the toner recovery box filled with the toner is removed from the cleaning device. JP-58-179886 describes a processing vessel of waste toner. The vessel ist stored freely attachably and detachably in a cleaning device provided with a cleaning blade. A scooping member is turned around a pin. The toner scraped off by the blade is dropped and stored in the vessel through an aperture of the vessel. When the vessel full of the waste toner is taken out from the machine, the scooping member is turned counterclockwise to close the aperture. Consequently, the vessel is attached to or detached from the cleaning device in the closed state. JP-60-26377 discloses a developing device of a copying machine. When the developing device is extracted from the machine frame, two covers are joint together with a spring to close the toner discharge port. When the developing device is set in the machine frame, a pin provided to the main frame side is inserted into a notch part provided to the covers, which are then turned upward and downward around a shaft as a fulcrum against the elastic force of the spring. When the setting is completed, the toner discharge port is opened. This citation, however, concerns a developing device and not a cleaning device. It is an object of this invention to provide a cleaning device of the type on which a toner recovery box having a toner inlet extending in the front-rear direction is replaceably mounted, in which scattering of the toner from the toner inlet can be exactly prevented during or after taking out the toner recovery box from the cleaning device. This object is accomplished with a cleaning device as claimed in claim 1. Dependent claims are directed on features of preferred embodiments of the invention. In the device according to the invention, the toner recovery box is inserted into the receiving space by being moved at least rearwardly and withdrawn from the receiving space by being moved at least forwardly; and the actuating element and the non-actuating element are constructed such that while the toner recovery box is moved rearwardly to a particular position, the actuating element does not act on the non-actuating element, but while the toner recovery box is moved rearwardly from the particular position to a final position, the actuating element acts on the non-actuating element. In a preferred embodiment of the invention, at the particular position, the toner inlet of the toner recovery box is surrounded all along with the supporting frame structure. Preferably, at least the front surface of the receiving space is open. In the above cleaning device, when the toner recovery box is inserted into the receiving space of the supporting frame structure, the actuating element acts on the non-actuating element to bring the cover member to the open position and to expose the toner inlet of the box. Hence toner is transferred from the toner inlet to the inside of the box without any trouble. On the other hand, when the toner recovery box is withdrawn from the receiving space of the supporting structure after it has been filled with the toner, the actuating element fails to act on the non-actuating element. As a result, the cover member is brought to the closed position by the biasing action of the elastic means, and the toner inlet of the box is closed. Accordingly, scattering of the toner from the toner inlet is exactly prevented. Figure 1 is a sectional view showing a unit including an embodiment of the cleaning device constructed in accordance with this invention. Figure 2 is a side elevation showing a toner recovery box receiving space in the unit of Figure 1. Figure 3 is a partial perspective view showing the toner recovery box receiving space in the unit of Figure 1 as it is viewed along the line IX-IX of Figure 2. Figure 4 is an exploded partial perspective view showing the front end portion of the toner recovery box receiving space in the unit of Figure 1. Figure 5 is an exploded perspective view showing a toner recovery box in the unit of Figure 1. Figures 6 -A, 6 -B and 6 -C are respectively a side, a front and a sectional view which show the toner recovery box in the unit of Figure 1 as it has been inserted into the toner recovery box receiving space to a particular position. Figures 7 -A, 7 -B and 7 -C are a side, a front and a sectional view which respectively show the toner recovery box in the unit of Figure 1 as it has been inserted into the toner recovery box receiving space to a final position. With reference to the accompanying drawing, a preferred embodiment of the cleaning device constructed in accordance with this invention will be described in detail. Figure 1 illustrates a unit containing an embodiment of the cleaning device constructed in accordance with this invention. The unit shown generally at 202 has a supporting frame structure 204 on which are mounted a cleaning device shown generally at 212 together with a rotating drum 206 and a charging corona discharger 208. The cleaning device 212 comprises removing means 214, sealing means 216, carry-in means 218 and toner holding means 220. With reference to Figure 1, a toner recovery box receiving space 262 extending in the front-rear direction (the direction perpendicular to the sheet surface in Figure 1) is formed in the left side portion in Figure 1 of the supporting frame structure 204 of the unit 202. A toner recovery box shown generally at 264 which constitutes the toner holding means 220 is detachably inserted in the space 262. With reference to Figures 2 to 4, particularly Figure 3, taken in conjunction with Figure 1, the space 262 formed in the supporting structure 204 is opened entirely in its front surface, nearly entirely in its left side surface and the left half portion of its under surface. On the other hand, the supporting frame structure 204 has a bottom wall 266 extending substantially horizontally along the right half portion of the under surface of the space 262, an upper wall 268 extending substantially horizontally along the upper surface of the space 262, and a rear wall 270 extending substantially vertically from the rear end of the bottom wall 266 to the rear end of the upper wall 268. An upright guide wall 272 projecting upwardly a predetermined distance from the upper surface of the bottom wall 266 (a distance corresponding to about one-third of the total height of the space 262) is formed integrally with the bottom wall 266. An abutting stepped portion 274 extending in the front-rear direction is formed in one side surface of the upper portion of the guide wall 272, and furthermore, guide walls 276 and 278 projecting upwardly are formed in the bottom wall 266 in spaced-apart relationship, and define a guide channel 280 extending in the front-rear direction. A lower part guiding longitudinal protrusion 282 projecting to the left in Figure 1 is formed in the guide wall 278. The lower part guiding longitudinal protrusion 282 extends substantially horizontally in the rearward direction from its front end kept in alignment with the front end of the bottom wall 266, but does not extend to the rear wall 270 and terminates at a point apart from the rear wall 270 by a predetermined distance. An upper part guiding longitudinal protrusion 284 extending substantially vertically from the left side edge is formed in the upper wall 268. The upper part guiding protrusion 284 extends from its front end kept in alignment with the front end of the upper wall 268 to the rear wall 270 and has rectangular notches 286 and 288 formed respectively at its front end portion and rear end portion. A projecting portion 290 extending downwardly is formed at the rear end of the upper part guiding longitudinal protrusion 284. As illustrated in Figure 3, a continuously extending opening 292 is formed in the rear end portion of the upper wall 268 and the upper portion of the rear wall 270. Furthermore, as will be stated hereinafter, when the unit 202 is mounted in the housing of the image-forming machine, a toner detector 240 fixed to the under surface of the base plate 231 of the housing projects into the space 262 through the opening 292. As shown in Figures 2 and 3, an actuating element 294 constructed of a forwardly extending projecting piece is formed in the front surface of the rear wall 270. Furthermore, in the lower end of the rear wall 270 is formed a forwardly extending L-shaped projecting wall portion 296, and a stopping block portion 298 is formed at a corner in the rear end of the projecting wall portion 296. With reference to Figures 2 and 4 , an additional member 300 is fixed to the front surface of the supporting frame structure 204 by a set screw (not shown), and the supporting frame structure 204 projects forwardly at its site where the space 262 exists. If desired, the additional member 300 may be formed integrally with the supporting frame structure 204. The additional member 300 has a bottom wall 302, a relatively high side wall 304 extending upwardly from one side edge of the bottom wall 302 and a relatively low side wall 306 extending upwardly from the othe rside edge of the bottom wall 302. A guide wall 308 is formed in the bottom wall 302, and the guide wall 308 and the lower portion of the side wall 304 define a guide channel 310 which extends in the front-rear direction in alignment with the guide channel 280. The inside surface of the side wall 304 has an arcuate portion 312 and a flat portion 314 extending upwardly from the arcuate portion 312. It will be seen by referring to Figure 6 -B in conjunction with Figure 4 that the arcuate portion 312 and the flat portion 314 in the inside surface of the side wall 304 are of nearly the same shape as an arcuate portion 318 and a flat portion 320 formed in one side edge of the front wall 316 of the supporting frame 204, but are displaced counterclockwise in Figure 6 -B by a predetermined angle with respect to the arcuate portion 318 and the flat portion 320. It will be seen by referring to Figure 2 that a dent portion 322 dented clockwise in Figure 6- B is formed in the rear part of the inside surface of the side wall 304. The dent portion 322 has an arcuate portion 324 and a flat portion 326 which are in alignment with the arcuate portion 318 and the flat portion 320, or in other words, form the same plane as the arcuate portion 318 and the flat portion 320. With reference to Figure 5 together with Figure 1, the toner recovery box shown generally at 264 includes a box 328 preferably formed of transparent or semi-transparent synthetic resin. The box 328 is a hollow body extending in an elongate shape in the front-rear direction. One side surface, i.e. the right side surface in Figure 1, has an arcuate portion 330 and a flat portion 332 extending upwardly from the arcuate portion 330. A toner inlet 334 preferably a rectangular opening extending in the front-rear direction over nearly the entire length of the box 328 is formed in the lower part of the arcuate portion 330. A downwardly extending guided protrusion 336 is formed in the under surface of the box 328. The lower end portion of the guided protrusion 336 extending in the front-rear direction has a nearly circular sectional shape. In the rear end portion of the under surface of the box 328 is formed a rectangular lower part guided protrusion 338 projecting to the right in Figure 1. Upwardly projecting rectangular upper part guided protrusions 340 and 342 are formed at the front end portion and the rear end portion of the upper surface of the box 328. A nearly rectangular sedimentation portion 344 exists on one side of the rear end portion of the upper surface of the box 328, and a projecting portion 346 to be detected is formed in the sedimentation 344. A forwardly projecting gripping piece 348 is formed in the front surface of the box 328. The toner recovery box 264 further includes a cover member 350 having a main portion 352 being arcuate in section and extending in the front-rear direction. As shown in Figure 1, a long protrusion 354 extending inwardly is formed in the lower end edge of the main portion 352. Linking pieces 356 and 358 extending inwardly are formed respectively at the front end and the rear end of the main portion 352. Holes 357 and 359 are respectively provided in the linking pieces 356 and 358. Depressed portions 360 and 362 corresponding to the linking pieces 356 and 358 are formed in the front surface and the rear surface of the box 328. A forwardly projecting short shaft 364 is provided in the depressed portion 360, and a rearwardly projecting short shaft 366 (Figure 6 -C), in the depressed portion 362. The cover member 350 is mounted on the box 328 by positioning the linking piece 356 at the depressed portion 360, and inserting the short shaft 364 into the hole 357, and also positioning the linking piece 358 at the depressed portion 362 and inserting the short shaft 366 (Figure 6 -C) into the hole 359. The cover member 350 so mounted on the box 328 is free to pivot between a closed position (the position shown in Figures 6 -B and 6 -C) at which the under surface of its long protrusion 354 (Figure 1), abuts against the lower edge of the toner inlet 334 and a position (the position shown in Figures 1, 7 -B and 7 -C) at which the upper surface of the long protrusion 354 (Figure 1) abuts against the upper edge of the toner inlet 334 about an axis extending in the front-rear direction, i.e. the central axis of the short shafts 364 and 366, as a center. Elastic means 368 constructed of a helical spring is disposed between the box 328 and the cover member 350. It will be appreciated by referring to Figure 6 -C in conjunction with Figure 5 that the helical spring constituting the elastic means 368 is idly fitted over the short shaft 366, and its one arm abuts against one side surface 370 of the depressed portion 362 while its other arm is positioned within a notch 372 formed in the linking piece 358. Thus, the elastic means 368 elastically biases the cover member 350 clockwise (counterclockwise in Figure 6 -C) as viewed from the front side of the cover member 350 and holds it elastically at the above closed position. When the cover member 350 is held at the closed position, the toner inlet 334 of the box 328 is closed by the cover member 350. On the other hand, when the cover member 350 is held at the open position in the manner to be described, the toner inlet 334 of the box 328 is opened. A non-actuating element 374 made of a projecting piece extending rearwardly from the linking piece 358 is also formed in the cover member 350. An inclined surface 376 is formed in the front end portion of the non-actuating element 374. The toner recovery box 264 described above is inserted into the toner recovery box receiving space 262 by the following procedure. With reference to Figures 6 -A to 6 -C in conjunction with Figures 2, 4 and 5 , the first step is to move the tone recovery box 264 rearwardly from the front side of the additional member 300 and insert its rear portion into the additional member 300. At this time, the guided protrusion 336 formed in the box 328 is positioned in the guide channel 310 of the additional member 300, as shown in Figure 6 -B. Thus, the box 328, excepting its left upper portion in Figure 6 -B, is positioned in a space defined by the bottom wall 302 and the two side walls 304 and 306 of the additional member 300. As a result, as can be seen from Figure 6 -B the toner recovery box 364 is restrained at a first angular position shown in Figures 6 -A, 6 -B and 6 -C by the side walls 304 and 306 of the additional member 300. Then, the toner recovery box 364 is further moved rearwardly to a particular position shown in Figure 6 -A. As a result, one side portion of the lower end of the rear surface of the box 328 (the left side portion of the lower end in Figure 6 -B) abuts against the projecting wall portion 296 (see Figure 3 also) to thereby hamper further rearward movement of the toner recovery box 264. It will be appreciated by referring to Figures 6 -B and 6 -C that while the toner recovery box 264 is moved rearwardly to the particular position shown in Figure 6 -A, the guided protrusion 336 of the box 328 moves rearwardly in the guide channel 310 of the additional member 300 and the guide channel 280 formed in the supporting frame structure 204. The lower part guided protrusion 338 of the box 328 moves rearwardly along the under surface of the lower protruding protrusion 282 formed in the supporting frame structure 204. When the toner recovery box 264 is inserted to the particular position shown in Figure 6 -A, the front end of the box 328 is positioned in correspondence to the dent portion 322 formed in the rear portion of the inside surface of the side wall 304 in the additional member 300. The lower part guided protrusion 338 of the box 328 is positioned beyond and, rearwardly of the rear end of the lower part guiding protrusion 282 in the supporting frame structure 204. In addition, the upper part guided protrusions 340 and 342 of the box 328 are positioned in correspondence to the notches 286 and 288 formed in the upper part guiding protrusion 284 of the supporting frame structure 204. Consequently, the restraining of the toner recovery box 264 at the first angular position shown in Figures 6 -B and 6 -C is cancelled. Accordingly, when the toner recovery box 264 is turned clockwise in Figure 6 -B and counterclockwise in Figure 6 -C by holding the gripping piece 348 formed in the front surface of the box 328, it is turned to a second angular position shown in Figures 7 -A to 7 -C from the above first angular position shown in Figures 6 -A to 6 -C about the lower end portion of the guided protrusion 336 as a center. When the toner recovery box 264 is turned to the second angular position, the lower end portion of the arcuate portion 330 existing on one side surface of the box 328 abuts against the upper end portion of the upright guide wall 272 of the supporting frame structure 204, and thus the toner recovery box 264 is prevented from turning clockwise in Figure 7 -B and counterclockwise in Figure 7 -C beyond the second angular position, as shown in Figures 7 -9 and 7 -C. It will be appreciated by referring to Figures 7 -B and 7 -C that the upper part guided protrusions 340 and 342 formed in the box 328 passe through the notches 286 and 288 formed in the upper part guiding protrusion 284 and are positioned on the right side in Figure 7 -B and left side in Figure 7 -C of the upper guiding protrusion 284. In addition, one side portion of the lower end of the rear surface of the box 328 is positioned above the projecting wall portion 296 to permit the toner recovery box 264 to move further rearwardly. Then, the toner recovery box 264 held at the second angular position is further moved rearwardly to the final position shown in Figure 7 -A. As a result, one side portion of the lower end (the left side portion of the lower end in Figure 7 -B) in the rear surface of the box 328 abuts against the stopping block 298 (see Figure 3 also) formed in the projecting wall portion 296, and one side portion of the upper end (the left side portion of the upper end in Figure 7 -B) of the box 328 abuts against the projecting portion 290 formed in the rear end of the upper part guiding protrusion 284. Consequently, further rearward movement of the toner recovery box 264 is hampered. When the toner recovery box 264 is moved from the above particular position (the position shown in Figure 6 -A) to the final position (the position shown in Figure 7 -A), the upper guided protrusions 340 and 342 of the box 328 move along the right side surface in Figure 7 -B of the upper guiding protrusion 284 and the left side surface in Figure 7 -C. As a result, the toner recovery box 264 is prevented from turning counterclockwise in Figure 7 -B and clockwise in Figure 7 -C and is restrained at the second angular position shown in Figures 7 -A to 7 -C. While the toner recovery box 264 is moved rearwardly from the particular position to the final position, the actuating element 294 provided in the supporting frame structure 204 exerts a "cam action" on the non-actuating element 374 provided in the cover member 350 to pivot the cover member 350 clockwise in Figures 6 -C and 7 -C against the elastic biasing action of the elastic means 368, as can be seen by comparing Figure 6 -C with Figure 7 -C. Thus, the cover member 350 is brought to the open position from the closed position and as shown in Figure 1, the toner inlet 334 of the box 328 is opened. When the toner recovery box 264 is inserted and held at the final position as above, the detected protrusion 346 of the box 328 is positioned properly with respect to the toner detector 240 fixed to the under surface of the base plate 231 disposed within the housing of the image-forming machine. More specifically, the toner detector 240 has two downwardly extending portions 378 and 380 spaced from each other, and the detected projecting portion 346 of the box 328 is positioned between the two downwardly extending portions 378 and 380. A suitable light-emitting element (not shown) is disposed in one downwardly extending portion 378 and a suitable light receiving element (not shown) for receiving light from the light-emitting element is disposed in the other downwardly extending portion 380. When the operation of the image-forming machine on which the unit 202 is mounted is repeated, the toner removed from the peripheral surface of the rotating drum 206 is carried into the box 328 through the open toner inlet 334 in the toner recovery box 264 as shown by arrow 260 in Figure 1. When the box 328 is filled up with the toner, the toner also exists in the projecting portion 346 to be detected of the box 328. As a result, the light from the light emitting element (not shown) disposed in the downwardly extending portion 378 of the toner detector 240 is shut off by the toner, and the light-receiving element disposed in the downwardly extending portion 280 of the toner detector 240 fails to receive the light. On the basis of this phenomenon, the toner detector 240 produces a signal showing that the box 328 has been filled up with the toner. This signal energizes warning means (not shown) such as a warning lamp provided in the image-forming machine. As required, it renders the image-forming machine inoperable. When the box 328 has been filled up with the toner, it is necessary to remove the toner recovery box 264 from the supporting structure 204 and insert a fresh toner recovery box 264 into the space 262 of the supporting frame structure 204. The toner recovery box 264 may be removed from the supporting frame structure 204 by performing the above inserting operation in a reverse manner. Specifically, by holding the gripping piece 348 formed in the front surface of the box 328 to move the toner recovery box 264 forwardly from the final position shown in Figure 7 -A to the particular position shown in Figure 6 -A or a position just ahead of it (the position at which the front surface of the box 328 abuts against the front end surface of the dent portion 322 formed in the inside surface of the side wall 304 in the additional member 300 and thereby the forward movement of the toner recovery box 264 at the second angular position is hampered). As a result, as can be seen from a comparison of Figure 7 -C with Figure 6 -C, the non-actuating element 374 formed in the cover member 350 of the toner recovery box 264 is removed from the actuating element 294 provided in the supporting frame structure 204. Hence, the cover member 350 is brought by the elastic biasing action of the elastic means 368 to a position at which it closes the toner inlet 334, and elastically held at the closed position. It will be appreciated by referring to Figures 7 -A and 6 -A that where the toner recovery box 264 has been moved forwardly to the particular position or a position slightly ahead of it, the toner inlet 334 of the box 328 is surrounded by the supporting frame structure 204 itself and the forwardly extending portion provided by the additional member 300, and in this state, the cover member 350 is held at the closed position. Accordingly, in the early stage of the operation of removing the toner recovery box 264 from the supporting frame structure 204, or in other words before the toner inlet 334 is closed by the cover member 350, toner scattering from the toner inlet 334 does not occur. Then, the toner recovery box 264 is turned from the second angular position shown in Figures 7 -A to 7 -C to the first angular position shown in Figures 6 -A to 6 -C. Then, the toner recovery box 264 is further moved forwardly to detach the supporting frame 204 and the additional member 300. Since in this removing operation, the toner inlet 334 is closed by the cover member 350, toner dropping or scattering from the toner inlet 334 can be accurately prevented. The removed toner recovery box 264 can be directly discarded. While the cleaning device constructed in accordance with this invention has been described with reference to the preferred embodiments shown in the attached drawings, it should be understood that the present invention is not limited to these specific embodiments, and various changes and modifications are possible without departing from the scope of the invention as claimed. For example, the present invention has been described with regard to the cleaning device provided in a unit including a rotating drum, the invention can also be applied to a cleaning device adapted to be mounted in the housing of the image-forming machine independently of the rotating drum.

Claims: A cleaning device (212) for an image-forming machine, said cleaning device comprising a supporting frame structure (202) having a front side and a rear side and including a toner recovery box receiving space (262) extending in the front-rear direction, and a toner recovery box (264) adapted to be withdrawably inserted into said receiving space (262), said recovery box (264) comprising a toner inlet (334) extending in the front-rear direction, and a cover member (350) mounted on the box so as to be free to move between a closed position at which it closes the toner inlet (334) and an open position at which it exposes the toner inlet (334), characterized in that the toner recovery box (264) is adapted to be inserted into said space (262) by being moved at least rearwardly and to be withdrawn from said space (262) by being moved at least forwardly, an elastic means (368) for elastically biasing the cover member (350) to the closed position is provided at the recovery box (264), an actuating element (294) is provided at the supporting frame structure (202), a non-actuating element (374) is provided in the cover member (350), the supporting frame structure (202) has provided therein guide means (280, 310), the toner recovery box (264) has provided therein guided means (336), the actuating element (294) and the non-actuating element (374) are constructed such that when the toner recovery box (264) is inserted into the receiving space (262), the actuating element (294) acts on the non-actuating element (374) to move the cover member (350) to the open position against the biasing force of the elastic means (368), and that the actuating element (294) does not act on the non-actuating element (374) while the toner recovery box (264) is being moved rearwardly toward a particular position, but that while the toner recovery box (264) is moved rearwardly from the particular position toward its final position, the actuating element (294) acts on the non-actuating element (374), and the guide means (280, 310) and the guided means (336) restrain the toner recovery box (264) at a first angular position while the toner recovery box (264) is being moved rearwardly to the particular position and forwardly from the particular position, and hampers the rearward movement of the toner recovery box (264) beyond said particular position when the toner recovery box (264) is held at the first angular position; when the toner recovery box (264) is turned from the first angular position to a second angular position, the guide means (280, 310) and the guided means (336) permit the toner recovery box (264) to move rearwardly to the final position beyond the particular position; and while the toner recovery box (264) is moved between the particular position and the final position, the guide means (280, 310) and the guided means (336) restrain the toner recovery box (264) at the second angular position. The device according to claim 1, characterized in that at the particular position, the toner inlet (334) of the toner recovery box (264) is surrounded along its entire length by the supporting frame structure (202). The device according to claim 1, characterized in that the cover member (350) of the toner recovery box (264) is free to pivot between the closed position and the open position about an axis extending in the frontrear direction as a center.

Inventors: ISHIGURO YASUYUKI, KANO ATSUSHI, OGIRI TADAKAZU, OZAKI HIROFUMI, YAMASHITA YUJI, ISHIGURO, YASUYUKI, KANO, ATSUSHI, OGIRI, TADAKAZU, OZAKI, HIROFUMI, YAMASHITA, YUJI
Applicants: MITA INDUSTRIAL CO LTD, MITA INDUSTRIAL CO., LTD.
Application year: 1987
Main classification: G03G21
IPC codes: G03G21