Toner cartridge and drum cartridge for receiving the toner cartridge therein

Abstract: A toner cartridge includes an outer pipe (1), inner pipe (2) inserted into the outer pipe (1), and cap (5) fitted over the inner pipe (2). The outer pipe (1) and inner pipe (2) are of a long, hollow cylinder shape and are formed with a plurality of first and second openings (1b, 2b), respectively, The inner pipe (2) has at one end thereof a toner-filling opening (2c) and an annular flange eccentric with respect to the hollow cylinder, and at the other end thereof a knob (4) that closes the longitudinal end of the hollow cylinder and abuts the outer pipe (1). The first openings (1b) are not aligned with the second openings (2b) when the inner pipe (2) is at a first rotational position and are aligned when the inner pipe (1) is at a second rotational position. A sealing member (3) is mounted to the inner pipe (2) encircling the second openings (2b) and has third openings (3b) aligned with the second openings (2b). The sealing member (3) not only seals the gap between the inner pipe (2) and the outer pipe (1) but also holds the inner pipe (2) eccentric with respect to the outer pipe (1). The outer pipe (1) has at least one flange (1a) which radially outwardly extends from the outer pipe (1) and longitudinally extends along the outer pipe (1). The flange (1a) has a plurality of ribs (1d) on one side thereof. The toner filling-opening (2c) has the same diameter as that of the hollow cylinder.

Description: BACKGROUND OF THE INVENTION The present invention relates to a toner cartridge structure and a drum cartridge structure for receiving the toner cartridge therein. A prior art electrography recording apparatus will be described with reference to the drawings. Fig. 11 is a perspective view of the prior art apparatus, Fig. 12 is a partial cutaway view as seen along the lines A-A of Fig. 11, and Fig. 13 is a longitudinal cross-sectional view. A toner cartridge subassembly 31 in the figures includes an outer pipe 32, an inner pipe 37, and caps 41. The outer pipe 32 takes the form of a pipe, and has openings 33 at longitudinal opposite ends thereof and a plurality of cutouts'34 formed in each opening. The outer pipe 32 is formed with a plurality of openings 35 therein aligned longitudinally thereof. The opening 35 is for discharging toner therethrough. The outer pipe 32 has a rib 36 that extends circumferentially thereof to define the openings 35. The inner pipe 37 in the form of a hollow cylinder slidably fits into the outer pipe 32. The inner pipe 37 has openings 38 at longitudinal opposite ends, concentric with respect to the outer pipe 32. The inner pipe 37 is formed with a plurality of openings 39 therein through which toner in the inner pipe 37 is discharged when the openings 39 are aligned with the openings 35. The inner pipe 37 has two ribs 40 extending circumferentially thereof, which ribs 40 are positioned such that ribs 40 define three openings 39, side by side, with one in the middle having an opening area twice as large as the other two adjacent ones. The caps 41 and 41a fit to the corresponding openings 38, respectively. The cap 41a is formed with a toner filling hole 42 therein. The cap 41 is formed with a cross-shaped groove 56 as shown in Fig. 14B, which is not shown in Fig. 13 ['or simplicity of explanation. A cap 43 fits into the toner-filling hole 42. The gap between the outer pipe 32 and the inner pipe 37 is sealed by means of a sealing material, not shown. Likewise, the gap between the caps 41 and the longitudinal ends of the inner pipe 37 are sealed. The operation of the aforementioned cartridge subassembly 31 will be described. The inner pipe 37 is slidably rotated relative to the outer pipe 32 till the openings 39 are aligned with the openings 35, thereby discharging toner in the inner pipe 37 through the aligned openings. Slidably rotating the inner pipe 37 in the reverse direction relative to the outer pipe 32 causes the openings 35 and 39 to move out of alignment with each other, thereby closing the opening 39 in the inner pipe 37 by means of the outer pipe 32. The mounting procedure of a toner cartridge 54 including the toner subassembly 31 will now be described. Figs. 14A and 14B are perspective views of an essential part of the prior art apparatus, Fig. 14A showing only a left one of the two structures provided at the left and right ends of a drum cartridge 50 that receives the toner cartridge 54, and Fig. 14B showing only a left one of the two structures provided at the left and right ends of the toner cartridge 54. A cartridge-receiving space 64 of the drum cartridge 50 includes a rotor 51 that is supported by the chassis 66 means of a hinged support and is rotatable relative to the chassis 66. The rotor 51 has a lever 52 and a cross-shaped projection 53 which are formed in one piece with the rotor 51. A projection 53 includes a long main projection 53a and a short sub projection 53b, which is perpendicular to the main projection 53a and formed in the middle of the main projection 53a. The main projection 53a has a first side 53c on its right hand side and a second side 53d on its left side hand. The sub projection 53b has a first sub projection 53e on its right hand side and a second sub projection 53f on its left hand side. The cap 41 is provided with a cross-shaped groove 56 and loosely fits over the projection 53 of the rotor 51. The groove 56 includes a main groove 56a and a sub groove 56b which is perpendicular to the main groove 56a at the middle of the main groove 56a. The main groove 56a has a first side wall 56c on its left hand side and a second side wall 56d on its right hand side. The sub groove 56b has a first sub groove 56e on its left hand side and a second sub groove 56f on its right hand side. The operation of the prior art apparatus will now be described with reference to Figs. 15A-15H which illustrate the mounting and dismounting operations of the prior art cartridge 54. The rotor 51 is depicted in solid line, and the cap 41 is depicted in dot-dash line. First, the lever 52 is operated to rotate the rotor 51 in the direction illustrated by arrow C as shown in Fig. 15A till the lever 52 abuts a stopper, not shown, and is then slightly operated in the reverse direction. The rotor 51 now takes up a cartridge-setting position where the cartridge 54 is to be placed in the cartridge-receiving space 64 of the drum cartridge (Fig. 15B). While being held parallel to the cartridge-receiving space 64, the cartridge 54 is lowered so that the projection 53 advances into the groove 56 of the cap 41 (Fig. 15B). The projection 53 is at an angle preventing the cartridge 54 from completely being inserted into the cartridge-receiving space 64 (Fig. 15B). Then, the cartridge 54 is further inserted into the cartridge-receiving space 64 while operating the lever 52 relative to the cap 41 slightly in the direction illustrated by arrow C as shown in Fig. 15C. The projection 53 is now in parallel to the groove 56 so that the cartridge 54 enters completely into the cartridge-receiving space 64. At this stage, the bottom of the outer pipe 32 is in close contact with a sealing member 60 of the cartridge-receiving space 64 and is exerted an upward force by the sealing member 60. Then, the lever 52 is operated to rotate the rotor 51 in the direction opposite to arrow C (Fig. 15D). While being rotated, the first sub projection 53e engages the sub groove 56e of the groove 56 which is pushed upwardly by the sealing member 60. The upward force is still acting on the cap 41 while the sub projection 53e engages the sealing member 60. When the rotor 51 again reaches the cartridge-setting position (Fig. 15D), the projection 53 becomes oblique to the groove 56 so that the first side 53c abuts the side wall 56c. This completes the mounting of the cartridge 54 into the cartridge-receiving space 64. Then, the rotor 51 is rotated in the direction illustrated by arrow B till the the rotor 51 abuts a stopper, not shown, as shown in Fig. 15E. The rotation of the rotor 51 is transmitted via the projection 53 and groove 56 to the cap 41, so that the cap 41 is also rotated in the direction illustrated by arrow B. The inner pipe 37 slidably rotates in the outer pipe 32. The cartridge 54 tends to rise from the cartridge-receiving space 64 due to angular moment. However, the engagement of the first sub projection 53e with the first sub groove 56e prevents the cartridge 54 from rising. The sealing member 60 secured to the rotor 51, as shown in Fig. 14, rotates with the rotor 51 in the direction illustrated by arrow B, so that the opening 61 formed in the bottom of the cartridge-receiving space 64 is aligned with the openings 32a and 37a of the outer pipe and inner pipe to allow the toner to be dumped into the drum cartridge. This is the "open cartridge" condition. In order to take out the cartridge 54 from the cartridge-receiving space 64, the lever 52 is operated to rotate the rotor 51 in the direction illustrated by arrow C as shown in Fig. 15F. Initially the rotor 51 alone rotates slightly relative to the cap 41 due to the loose engagement between the projection 53 and the groove 56, and a further rotation of the rotor 51 causes the second projection 53f to engage the second groove 56f. Then, the rotor 51 is still further rotated as shown in Fig. 15G in the direction indicated by arrow C till the rotor 51 abuts a stopper, not shown. In this situation, the cartridge 54 tends to rise from the cartridge-mounting space 64 due to angular moment. However, the engagement of the second sub projection 53f with the second sub groove 56f prevents the cartridge 54 from rising. The sealing member 60 in Fig. 14 rotates together with the rotor 51 in the direction illustrated by arrow C to close the opening 61 in the bottom of the cartridge-mounting space 64. The inner pipe 37 rotates relative to the outer pipe 32 in the direction illustrated by arrow C so that the openings 35 are completely out of alignment with the opening 39. This is the "closed cartridge" condition. Finally, the lever 52 is rotated slightly in the direction illustrated by arrow B so that the second sub projection 53f moves out of engagement with the second sub groove 56f and the projection 53 is now in parallel to the groove 56 (Fig. 15H). The bottom of the cartridge-mounting space 64 still exerts an upward force on the outer pipe 32 of the cartridge, raising the cartridge 54 upwardly. Thus, the cross-shaped projection 53 moves out of engagement with the cross-shaped groove 56 allowing the cartridge 54 to be taken out of the cartridge-mounting space 64. The aforementioned prior art cartridge is disadvantageous in that the number of parts is large, sealing means are required at both longitudinal ends, and the assembly operation is rather complex. In addition, when discharging the toner, the user must simultaneously rotate the lever 52 of the rotor 51 at both ends of the drum cartridge using both hands. Some other documents of the state of the art describe toner cartridges. The document EP-A-0 435 596 describes a toner cartridge in form of a cylinder, which is composed of an outer cylinder and an inner cylinder, which is coaxial and concentric to the outer cylinder. The document EP-A-0 597 507 describes a toner cartridge in form of an outer cylinder, in which an inner cylinder is contained. A cover is provided on the inner cylinder and this cover is concentric to the inner cylinder. The document US-A-3 356 248 describes a toner cartridge composed of a hollow cylindrical sleeve and a cylindrical core or liner. The document EP-A-0 744 671 describes a toner cartridge composed of an inner cylindrical member and an outer cylindrical member rotatable relative to and concentrically mounted around the inner cylindrical member. The cylindrical members are covered with cover elements. The document EP-A-0 733 483 describes a toner cartridge which comprises a container and a cover member. An object of the invention is to provide a toner cartridge which is simple in construction and easy to assemble. Another object of the invention is to provide a toner cartridge where toner can be discharged by operating a knob with only one hand. Still another object of the invention is to provide a toner cartridge/drum cartridge construction where the toner cartridge can be easily mounted to the drum cartridge. A toner cartridge according to the present invention includes an outer pipe (1), inner pipe (2) inserted into the outer pipe (1), and cap (5) fitted over the inner pipe (2). The outer pipe (1) is of a long pipe shape and is formed with a plurality of first openings (1b) therein aligned longitudinally thereof. The inner pipe is of a long pipe shape and has first and second longitudinal ends opposing each other. The pipe body of the inner pipe (2) is formed with a plurality of second openings (2b) therein aligned longitudinally thereof. The first end of the inner pipe (2) has a toner-filling opening (2c) extending longitudinally, and a first flange (1a) eccentric with respect to the pipe body, while the second end has a knob (4) that closes the longitudinal end of the pipe body and abuts the outer pipe. The first openings (1b) are not aligned with the second openings (2b) when the inner pipe (2) is at a first rotational position and are aligned when the inner pipe (1) is at a second rotational position. A sealing member (3) is mounted to the inner pipe (2), encircling the second openings (2b). The sealing member (3) not only seals the gap between the outer pipe (1) and the inner pipe (2) but also holds the inner pipe (1) eccentric with respect to the outer pipe (1). The sealing member (3) has third openings (3b) which are in alignment with the second openings (2b) in the inner pipe (2) when the inner pipe (2) is assembled into the outer pipe (1). The outer pipe (1) is provided with at least one flange (1a) which radially outwardly extends from the outer surface of the outer pipe (1) and longitudinally extends along the outer pipe (1). The flange (1a) has a plurality of ribs (1d) on one side thereof. The toner-filling opening (2c) has the same diameter as that of the pipe body of the inner pipe (2). The second openings (2b) are open in the direction opposite to the direction in which the first flange (1a) of the inner pipe (2) is eccentric with respect to the pipe body. The knob (4) is of a generally disc shape and has a part of the outer surface tapered such that the thickness of the knob (4) decreases with the radial distance from the center of the disc shape. The knob (4) has an outer circumferential surface concentric with respect to the outer pipe (1). On the outer circumferential surface is provided a mark, which is aligned with one of the flanges (1a) of the outer pipe (1) for a proper rotational position of the inner pipe relative to the outer pipe (1). In the outer circumferential surface is provided with an arcuate groove (4f) along the circumferential surface. The arcuate groove (4f) loosely fits over at least one projection formed on the bottom surface of a drum cartridge into which the tone cartridge is mounted, so that the rotation of the knob (4) is properly guided by the arcuate groove (4f) and the projection fitted thereinto. The knob (4) has a radially projecting lever (4g). The lever (4g) has a first arrow (4h) and a second arrow (4i) formed thereon. The first farrow (4h) indicates the rotational direction of the lever when the toner cartridge is is to be dismounted from the drum cartridge. The second arrow (4i) indicates the rotational direction of the lever when the inner pipe is to be rotated to the second rotational position to dump the toner after the toner cartridge has been received in the drum cartridge. The cap (5) has a conically tapered surface on a radially outer part of the top surface thereof. The cap (5) may be made of a transparent material and graduated with, for example, in the form of a plurality of lines so that the amount of the toner in the cartridge may be inspected. Of the plurality of second openings (2b) in the inner pipe (2), the openings adjacent the first and second ends are a predetermined distance, e.g., 12 mm apart from the first and second ends. The drum cartridge has a receiving portion (16) in the form of a hollow semi-cylinder for receiving the toner cartridge. The receiving portion (16) has first and second side walls opposing each other at longitudinal ends thereof. The receiving portion (16) opens upwardly and extends longitudinally. The receiving portion (16) has opposed first and second side walls at opposed ends. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of an outer pipe of a toner cartridge of the invention. Fig. 2A is a perspective view of an inner pipe of the toner cartridge of the invention. Fig. 2B is a perspective view of a sealing member. Fig. 3 illustrates the inner pipe inserted into the outer pipe. Figs. 4A-4B illustrate the side of a knob. Fig. 5A is a perspective view of a cap. Fig. 5B illustrates a modification of the cap. Fig. 5C is a cross-sectional side view of the cap fitted over the inner pipe taken along lines V-V in Fig. 6. Fig. 5D is a cross-sectional view of the cap having a recess. Fig. 6 is a perspective view of the assembled toner cartridge of the invention. Fig. 7A illustrates the toner cartridge received in a drum cartridge. Fig. 7B illustrates the knob fully rotated from the position in Fig. 7A. Fig. 7C illustrates a drum cartridge of the invention in detail. Fig. 8A illustrates the essential part of the drum cartridge shown in Figs. 7A and 7B. Fig. 8B illustrates the procedure for mounting the toner cartridge into the drum cartridge. Fig. 8C illustrates a modification of the drum cartridge in Fig. 8A. Figs. 9A-9B illustrate the relative rotational positions of the inner pipe and outer pipe. Figs. 9C-9D illustrate the relative rotational positions of modified inner an outer pipes. Fig. 10 illustrates an inner pipe concentric with respect to an outer pipe. Fig. 11 is a perspective view showing the prior art. Fig. 12 is a perspective view, partly cut away, as seen in the direction of arrow A-A. Fig. 13 is a longitudinal cross-sectional view of a prior art toner cartridge. Fig. 14A is a perspective view of an essential part of a prior art drum cartridge. Fig. 14B is a perspective view of an essential part of the prior art toner cartridge. Figs. 15A-15H are illustrative diagrams showing the mounting and dismounting operations of the prior art toner cartridge. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Fig. 1 is a perspective view of an outer pipe 1 of a toner cartridge of the invention. The outer pipe 1 is generally of a cylindrical shape having a small thickness, and opens at longitudinal opposed ends. The outer pipe 1 has two flanges 1a that prevent the toner cartridge 6 from rotating when mounting the toner cartridge 6 into the drum cartridge 7, and three openings 1b through which the toner is dumped into the drum cartridge 7. The flanges 1a are provided at diametrically opposed positions and extend longitudinally of the outer pipe 1. On one side of each flange are provided a plurality of ribs 1d along the outer pipe as shown in Fig. 6. The openings 1b are aligned longitudinally of the sleeve. Fig. 2A is a perspective view of an inner pipe 2 of the toner cartridge of the invention. The inner pipe 2 is of a generally cylindrical shape having a small thickness and a diameter smaller than the inner diameter of the outer pipe 1. The inner pipe 2 has a toner-filling opening 2c that opens at a first longitudinal end thereof, and a knob 4 that closes the inner pipe at a second end opposing the first end. The inner pipe 2 has two flanges 2a that are eccentric with respect to the pipe body of the inner pipe and has a slightly larger outer diameter than that of the pipe body. The two flanges define a circumferential groove 2d therebetween. After the inner pipe 2 has been filled with toner therein, a cap 5 shown In Fig. 5A is fitted over the toner-filling opening 2c to close the opening 2c. The maximum outer diameter of the cap 5 is as large as that of the outer pipe 1. In the middle of the inner pipe 2 are provided three openings 2b that are aligned longitudinally of the inner pipe and are open in a direction opposite to a direction in which the flanges 2a are eccentric with respect to the pipe body. The outer circumferential surface of the knob 4 has a diameter large than the outer diameter of the inner pipe but the same as the inner diameter of the outer pipe 1. The openings immediately adjacent the opposed longitudinal ends are arranged not too far from the longitudinal ends, preferably 12 mm, equal to a width of a later described sealing member 3, so that toner is not left in the inner pipe after the toner has been dumped into the drum cartridge 7. The knob 4 is formed with a circumferential groove 4f therein along the circumferential surface, and an arrow 4h indicative of the direction in which the knob 4 is to be rotated. The groove 4f guides the rotation of the knob 4 when the toner is discharged from the toner cartridge 6 into the drum cartridge 7. The knob 4 has a mark 4e in the form of a low projection arranged in the middle of the opening 2b as shown in Fig. 2B. Figs. 4A-4B illustrate the knob 4. The knob 4 has a radially projecting lever 4g, which has an arrow 4i provided thereon indicative of the rotational direction of the knob 4. The knob 4 is formed with a circumferential wall 4d that extends along the circumference of the disc shape of the knob 4. The circumferential wall 4d has a cutout 4b therein. Generally L-shaped ribs 4a and 4c are symmetrical with respect to the center of the disc shaped knob 4 and are inscribed in the circumferential wall 4d. The straight portions of the rib 4a are parallel to the straight portions of the rib 4c and are a predetermined distance L apart as shown in Fig. 4B. The rib 4a is immediately adjacent to the cutout 4b. As shown in Fig. 4A, the knob 4 has a tapered or chamfered part 4j at an angle  on the side thereof such that the thickness of the knob 4 decreases toward the cutout 4b. The taper 4j facilitates insertion of the toner cartridge 6 into the drum cartridge 7. Fig. 2B is a perspective view showing a sealing member 3. The sealing member 3 is formed of a resiliently deformable material such as urethane, sponge, felt, or the like, and has a thickness slightly larger than the gap between the inner and outer pipes, as shown in Figs. 9A-9D, between the inner pipe 2 and the outer pipe 1. The openings 3b in the sealing member 3 are slightly larger than the openings 2b. The sealing member 3 is bonded to the inner pipe 2 by means of, for example, a double sided bonding tape is such a way that the openings 3b are aligned with the openings 2b. The sealing member 3 seals the gap between the inner pipe 2 and the outer pipe 1 upon assembling the inner pipe 2 into the outer pipe 1, preventing the toner from leaking from the inner pipe 2. The sealing member 3 causes the inner pipe 2 to be eccentric with respect to the outer pipe and frictionally holds the inner pipe 2 in position relative to the outer pipe 1. Fig. 3 illustrates the inner pipe 2 inserted into the outer pipe 1. The inner pipe 2 is rotated so that the mark 4e on the knob 4 is in alignment with the flange 1a of the outer pipe 1 where the openings 2b are completely closed by the outer pipe 1 and the openings 1b are completely closed by the inner pipe 2, thereby properly sealing the gap between the inner pipe and the outer pipe. The side of the knob 4 serves as a stopper against the axial movement of the outer pipe 1 relative to the inner pipe 2. Fig. 6 is a perspective view of the completely assembled toner cartridge with the inner pipe filled with the toner. Since the maximum outer diameter of the cap 5 is the same as that of the outer pipe 1, the cap 5 serves as a stopper against the axial movement of the outer pipe 1 once the cap 5 has been fitted over the toner filling opening 21c. Thus, the inner pipe 2 is frictionally rotatable relative to the outer pipe 1 but is unable to move axially relative to the outer pipe. Fig. 9A is a cross-sectional view taken along lines IX-IX of Fig. 6. In the present invention, the pipe body of the inner pipe 2 is eccentric with respect to the outer pipe 1 so that the the outer circumferential surface of the inner pipe 2 diametrically opposite to the openings 2b is urged against the inner wall of the outer pipe 1 upon completion of assembly. Thus, the flange 2a eccentric with respect to the pipe body of the inner pipe 2, is concentric with respect to the outer pipe 1. For the same inner diameter of an outer pipe, a toner-accommodating space can have a larger inner diameter in an inner pipe eccentric with respect to the outer pipe shown in Fig. 9A-9B than in an inner pipe concentric with respect to an outer pipe as shown in Fig. 10. The resultant larger inner diameter provides a larger toner-accommodating space. With the construction shown in Fig. 10, the urging force exerted on the inner pipe 2 by the outer pipe via the sealing member 3 can cause the inner pipe to deflect in the middle thereof. In the present invention, the inner pipe 2 receives a force from the outer pipe 1 via the sealing member 3 and another force directly from the outer pipe 1. These two forces are equal in magnitude and opposite in direction, preventing the inner pipe 2 from deflecting in one direction during prolonged storage of the toner cartridge 6. Fig. 5C is a cross-sectional side view of the cap fitted over the inner pipe 2, taken along lines V-V in Fig. 6. The cap 5 is formed of a resilient material such as rubber. As is apparent from Fig. 5C, the cap 5 has an inwardly projecting annular projection 5b which fits into a groove 2d in the inner pipe 2 with a snap action when forcibly fitted over the toner-filling opening 2c. The outer diameter of the cap 5 is the same as that of the outer pipe 1. The cap 5 has a conically tapered surface on a radially outer part of the top surface thereof, the tapered surface facilitating the mounting of the toner cartridge 6 into the drum cartridge 7. As shown in Fig. 8A, the drum cartridge 7 has a receiving portion 16 in the form of a hollow semi-cylinder having a semi-circular cross section for receiving the toner cartridge 6 therein. The receiving portion 16 opens upwardly and extends longitudinally. The receiving portion 16 has first and second side walls 17a and 17b located at opposed longitudinal ends. The first side wall 17a is formed with a vertically extending projection 10 thereon which is a predetermined distance apart from the bottom of the receiving portion leaving a small space 10a under the projection 10. The width T of the projection 10 is selected to be smaller than the distance L between the ribs 4a and 4c. On the bottom of the receiving portion 16 near the projection 10 are provided two upward projections 12b. On the upper end of the second side wall 17b is provided with a laterally extending projection 11, which engages a step 5c of the cap 5 upon mounting the toner cartridge 6 into the receiving portion 16 to thereby prevent the toner cartridge 6 from moving out of the receiving portion 16. Fig. 7C shows the drum cartridge 50 in detail. Referring to Fig. 7C, a toner receiving space 81 is immediately below the receiving portion 16. The toner receiving space 81 houses a toner supplying roller 83 and a stirring bar 82 which is rotated to stir the toner so that the toner is distributed evenly in the toner receiving space 81. The developing roller 85 is rotated in contact with the toner supplying roller 83. A developing blade 90 operates to deposit the toner layer of a predetermined thickness on the developing roller 85. The developing roller 85 rotates in contact with the photosensitive drum 89 to deposit the toner layer on the photosensitive drum 89. A charging roller 87 and cleaning roller 88 are rotated in contact with the photosensitive drum 89. A recording medium such as paper travels below the drum cartridge 50 in the direction of arrow P. An LED head 86 enters the drum cartridge 50 through a hole 84 and opposes the photosensitive drum 89. The LED head 86 selectively illuminates the surface of the photosensitive drum 89 in accordance with the information received from the main part of the electrography recording apparatus, not shown, so as to form an electrostatic latent image on the surface of the photosensitive drum. The operations for mounting the toner cartridge 6 into the drum cartridge 7 and for discharging the toner from the toner cartridge 6 will be described with reference to Figs. 8A-8B and Fig. 6. First, the toner cartridge 6 is held in a position as shown in Fig. 6 with respect to the drum cartridge 7. Then, as shown in Fig. 8B, the toner cartridge 6 is inserted in the direction of arrow D into the receiving portion of the drum cartridge 7 so that the cap 5 enters under the projection 11. Then, the toner cartridge 6 is gently inclined about the cap 5 in the direction of arrow E so that the the projection 10 of the drum cartridge 7 enters the gap between the ribs 4a and 4c through the cutout 4b. The taper 4j of the knob 4 facilitates the smooth entering of the rib 4 into the drum cartridge 7. Upon inclining the toner cartridge 6 fully in the direction illustrated by arrow E, the two flanges 1a of the outer pipe 1 are seated on the longitudinally extending edges of the receiving portion 16, and the projections 12h on the bottom of the receiving portion 16 loosely fits into the arcuate groove 4f in the knob 4. Thus, the toner cartridge is comfortably seated in the drum cartridge 7 as shown in Fig. 7A. At this stage, the inner pipe 2 is in a positional relation as shown in Fig. 9A with the outer pipe 1. The projections 12b loosely fitted into the groove 4f serve to smoothly guide the knob 4 when the knob 4 is rotated in order to discharge the toner. When the toner cartridge 6 has been completely received in the receiving portion 16, the step 5c of the cap 5 engages the projection 11 and the outer surface of the tone cartridge 6 is flush with the projection 11. Then, operating the lever 4g to rotate the knob 4 in the direction illustrated by the arrow 4h (direction F in Fig. 9B) causes the circumferential wall 4d to enter the space 10a under the projection 10, preventing the toner cartridge 6 from rising up. The rotation of the knob 4 causes the inner pipe 2 to frictionally rotate relative to the outer pipe 1. The two flanges 1a seated on the drum cartridge 7 hold the outer pipe 1 in position, preventing the outer pipe 1 from rotating together with the inner pipe 2 when dumping the toner into the drum cartridge. Even if the toner cartridge 6 has been filled with toner therein with the inner pipe aligned at the wrong position relative to the outer pipe, the ribs 1d on one side of the flanges 1a abuts the longitudinal edges of the receiving portion 16 before the flanges 1a are comfortably seated on the longitudinal edges, preventing further insertion of the toner cartridge 6 into the receiving portion 16. This prevents an accidental opening of the toner-discharging opening with the toner-discharging opening (openings 2b and 1b) oriented in the wrong direction. Rotating the knob 4 through approximately 90 degrees, causes the ribs 4a and 4c to abut the projection 10 with the result that the knob 4 stops rotation thereof at a position as shown in Fig. 7B. At this stage, the inner pipe 2 is in a positional relation as shown in Fig. 9B with the outer pipe 1. With the knob 4 at this rotational position, the openings 1b of the outer pipe 1, openings 2b of the inner pipe 2 and openings 16a of the receiving portion of the drum cartridge 7 are aligned with one another so that the toner is dumped from the inner pipe 2 into the drum cartridge 7. In the present invention, simply turning the knob 54 provided only on one longitudinal end of the inner pipe, permits mounting of the toner cartridge 6 into the receiving portion 16 and discharging of the toner into the drum cartridge 7. Thus, the invention provides a simple mounting operation of the toner cartridge. Further, the toner cartridge/drum cartridge construction is such that the inner pipe 2 stops rotation thereof at a position where the openings 2b are in alignment with the openings 1b of the outer pipe 1. This construction ensures discharge of toner from the toner cartridge 6 into the drum cartridge 7. The resilient cap 5 having the same outer diameter as the outer pipe 1 is fitted over the flanges 2a with a snap action and prevents pull-out of the outer pipe 1 from the inner pipe 2. This construction reduces the number of parts and ensures sealing effect at the toner-filling opening. The cap 5 may be made of a transparent material and graduated as shown in Fig. 5B with a plurality of lines so that the amount of toner contained in the toner cartridge 6 can be visually inspected. The toner cartridge 6 may be constructed to have a recess 2e in the inner pipe 2 and a hole 1c in the outer pipe 1 as shown in Figs. 9C-9D so that the the recess 2e is in alignment with the hole 1c only when the the knob 4 is fully rotated to the position shown in Fig. 7B. A pin 15 may be provided on the lid 70 of the electrography recording apparatus at such a position that the pin 15 enters the recess 2e through the hole 1c when the lid 70 is closed after discharge of toner into the drum cartridge 7. This construction prevents the user from inadvertently closing the lid 70 with the knob 4 left between the two extreme ends of rotation thereof. The drum cartridge 7 contains toner therein and therefore is preferably held horizontal when taking out from the electrography recording apparatus. The center of gravity of the drum cartridge 7 is not always at an equal distance M/2 from left and right ends thereof and therefore the drum cartridge may be preferably provided with an arrow 7b indicative of the center of'gravity at which the user should hold the drum cartridge 7 when lifting it from the electrography recording apparatus. The side wall 17b may be provided with a projection 13 as shown in Fig. 8C, and the cap 5 may be provided with a recess 5d as shown in Fig. 5D into which the projection loosely extends when the toner cartridge 6 is mounted into the receiving portion 16. The projection ensures rotation of the inner pipe 2 when discharging toner.

Claims: A toner cartridge comprising: a generally cylindrical outer pipe (1) having longitudinally opposed end portions, said outer pipe having at least one first opening (1b) between said opposed end portions; and a generally cylindrical inner pipe (2) inserted into said outer pipe (1), said inner pipe having longitudinally opposed first and second end portions and at least one second opening (2b) between said first and second end portions, said second end portion having a knob (4) for rotating said inner pipe with respect to said outer pipe and closing said second end portion, said first opening (1a) being not in alignment with said second opening (2b) when said inner pipe (2) is moved to a first position with respect to said outer pipe (1) and being in alignment with said second opening (2b) when said inner pipe (2) is moved to a second position, characterized in that said inner pipe (2) is eccentric with respect to said outer pipe (1) and that said first end portion has a first flange (2a) eccentric with respect to said inner pipe (2), said flange (2a) being annular in shape and diametrically opposite to the opening direction of said second opening (2b) and being concentric with respect to said outer pipe (1). The toner cartridge of claim 1, wherein said knob (4) is generally in the shape of a disc and has a part of a circular surface (4j) thereof tapered such that a thickness of said knob (4) decreases with increasing radial distance from a center of the disc shape. The toner cartridge of claim 1 or 2, wherein said outer pipe has at least one second flange (1a) radially extending and extending longitudinally thereof, said second flange (1a) having at least one rib (1d) on one side of said second flange (1a). The toner cartridge of any one of the claims 1 to 3, wherein said knob (4) has an outer circumferential surface and a mark (4e) provided on said circumferential surface, said outer pipe (1) being positioned with respect to said inner pipe (2) so that said mark (4e) is in alignment with said second flange (1a) of said outer pipe (1), whereby said inner pipe (2) is positioned at said first position. The toner cartridge of any one of the claims 1 to 4, wherein said first end portion has a pipe end opening (2c) and has a cap (5) for closing said pipe end opening (2c), said cap (5) has a conically chamfered surface on a radially outer part of a top surface thereof. The toner cartridge of claim 5, wherein the cap (5) is formed of a transparent material to facilitate observation of an amount of toner in said toner cartridge form outside thereof. The toner cartridge of any one of the claims 1 to 6, wherein said first end portion has a pipe end opening (2c) which is of the same inner diameter as said inner pipe (2). The toner cartridge of any one of the claims 1 to 7, further having a sealing member (3) having at least one third opening (3b) in alignment with said second opening (2b), said sealing member (3) being mounted to said inner pipe (2) and surrounding said second opening (2b) to seal a gap between said outer pipe (1) and said inner pipe (2), and said second opening (2b) is away from said knob (4) and said first end portion by a distance substantially equal to a width of said sealing member (3). The toner cartridge of any one of the claims 1 to 8, wherein said knob (4) has a substantially radially projecting lever (4g), said lever (4g) has a first arrow (4h) indicative of a direction of rotation of said inner pipe (2) relative to said outer pipe (1) toward said first position and a second arrow (4i) indicative of a direction of rotation of said inner pipe (2) relative to said outer pipe (1) toward said second position. The toner cartridge of any one of the claims 1 to 9, wherein said outer pipe (1) and said inner pipe (2) have shorter longitudinal dimension than a width of a print region of a medium, and said second opening (2b) extends close to said first and second end portions. The toner cartridge of any one of the claims 1 to 10, wherein said knob (4) has an outer circumferential surface and a circumferentially extending groove (4f) formed in said circumferential surface, said groove (4f) being concentric with respect to said outer pipe (1). The toner cartridge of any one of the claims 1 to 11, wherein said first end portion has a pipe end opening (2c) and has a cap (5) for closing said pipe end opening (2c), the cap (5) has first recess at a center thereof, said first recess extending inwardly of said inner pipe. The toner cartridge of claim 12, further including: a second recess (2e) formed between said first and second end portions of said inner pipe (2); a through-hole (1c) formed in said outer pipe (1) at such a position that said second recess is in alignment with said through-hole (1c) in said outer pipe (1) only when said inner pipe (2) is fully rotated to said second position. A toner cartridge/drum cartridge construction comprising a toner cartridge according to any of the preceeding claims and a drum cartridge including a photosensitive drum and a space for receiving said toner cartridge therein. The toner cartridge/drum cartridge construction of claim 14, wherein said knob (4) has an outer circumferential surface and a circumferentially extending groove (4f) formed in said circumferential surface, said groove (4f) being concentric with respect to said outer pipe (1), and said drum cartridge has at least one projection (12b) over which said groove (4f) loosely fits. The toner cartridge/drum cartridge construction of claim 14 or 15, wherein said drum cartridge includes; a receiving portion (16) of a generally semicylindrical shape having an upward opening in which said toner cartridge is received; and first and second opposed side walls (17a, 17b) at longitudinally opposite ends, respectively. The toner cartridge/drum cartridge construction according to any one of the claims 14 to 16, wherein said drum cartridge has a holding portion (7a) which is held by a user when lifted during maintenance service, said holding portion (7a) being substantially located at a center of gravity in a longitudinal direction of said drum cartidge. A toner cartridge/drum cartridge construction according to any one of the claims 14 to 17, wherein said first end portion has a pipe end opening and has a cap (5) for closing said pipe end opening, the cap has a first recess (5d) at a center thereof, said first recess (5d) extending inwardly of said inner pipe, and said drum cartridge has a projection (13) which fits into said recess (5d) in said cap (5), said projection (13) serving as a rotation axis of said inner pipe (2) with respect to said outer pipe (1). The toner cartridge/drum cartridge construction according to any one of the claims 14 to 18, further including: a second recess (2e) formed between said first and second end portions of said inner pipe (2); a through-hole (1c) formed in said outer pipe (1) at such a position that said second recess (2e) is in alignment with said through-hole (1c) in said outer pipe (1) only when said inner pipe (1) is fully rotated to said second position; whereby a pin (15) provided on a lid (70) of an apparatus into which said toner cartridge and said drum cartridge are mounted, enters said second recess (2e) through said through-hole (1c) when said lid (70) is placed in position after the toner has been discharged from said toner cartridge into said drum cartridge.

Inventors: NAKAJIMA SHIGEKI, NAKAJIMA, SHIGEKI, Nakajima, Shigeki, c/o Oki Data Corporation
Applicants: OKI DATA KK, OKI DATA CORPORATION
Application year: 1997
Main classification: G03G15
IPC codes: G03G15