JP4680320B2 - Process unit and image forming apparatus - Google Patents

Description

  The present invention relates to a process unit and an image forming apparatus.

  In an image forming apparatus such as a copying machine, a printer, a facsimile, or a complex machine thereof, a process unit containing process means such as an image carrier, charging means, developing means, or toner containing portion can be attached to and detached from the image forming apparatus main body. The construction to be widely adopted. As a result, the process unit can be easily replaced, and maintenance is facilitated.

  As a conventional process unit, there is a configuration in which toner remaining on the surface of an image carrier is collected and re-supplied to developing means, as shown in Patent Document 1 below. The process unit includes an image carrier, a charging unit, a developing unit, a cleaning device, a toner storage chamber, a toner transport path, and a transport unit in the housing. After the image formation, the toner remaining on the surface of the image carrier is removed by a cleaning device, and the toner is transported in the toner transport path by a transport unit. The end of the toner transport path extends to the toner storage chamber, and the toner transported by the transport means is collected in the toner storage chamber. Then, toner is supplied from the toner storage chamber to the developing means and reused.

  In the process unit as disclosed in Patent Document 1, each component is integrally attached to one housing. Therefore, when one of the components in it has reached the end of its life, the other components that have a remaining life must be replaced or discarded together.

Therefore, in recent years, there has been a demand for a structure in which the constituent members of the process unit are divided into a plurality of detachable housings and the housings are assembled together. In such a structure, when a component in a unit has reached the end of its life, the unit can be separated from other units and replaced or discarded .

The present invention relates to a process unit including a plurality of housings, a first powder transport member that transports powder in the first housing, and a second powder transport member that transports powder in the second housing. And a process unit and an image forming apparatus capable of transmitting a drive between them.

The invention of claim 1 is a process unit configured to be detachable from the image forming apparatus, and includes a first housing and a second housing having a powder conveyance path therein, wherein the first housing A first powder conveying member that conveys the powder inside the first housing, and a power transmission member that transmits power to the first powder conveying member protrudes from a hole provided on the outer surface of the first housing; The second housing includes a second powder conveying member that conveys the powder inside the second housing, and the power transmission member has an insertion shaft extending toward the second powder conveying member. The insertion shaft is provided with an engaging male portion formed by forming a plurality of convex portions extending in the axial direction in the circumferential direction, and the engaging male portion is the power transmission member of the second powder conveying member. female engaging member and engaging provided in the insertion port formed in an end portion of the side Doing, the said power transmission member second powder transport member is configured to couple rotational motion of the second powder conveying member, the first powder conveying member via the power transmission member To be communicated to.

By configuring the power transmission member that transmits power to the first powder conveying member and the second powder conveying member to be engaged and connectable, the rotational movement of the second powder conveying member is It can be transmitted to the first powder conveying member via the power transmission member.

According to a second aspect of the present invention, in the process unit according to the first aspect, the first housing and the second housing are detachably assembled to each other.

The first housing and the second housing may be configured to be detachable from each other.

According to a third aspect of the present invention, in the process unit according to the first or second aspect, the first powder conveying member is a conveying belt, and an annular groove as a powder conveying path is formed inside the first housing. The conveyor belt is configured to circulate along the annular groove.

As the first powder conveying member, the conveying belt as described above can be applied.

The invention according to claim 4 is the process unit according to any one of claims 1 to 3, wherein the second powder conveying member is a conveying screw, and an end of the conveying screw on the power transmission shaft side. Projecting from the second housing.

As the second powder conveying member, the conveying screw as described above can be applied.

A fifth aspect of the present invention is an image forming apparatus comprising the process unit according to any one of the first to fourth aspects.

The process unit can be applied to an image forming apparatus.

According to the process unit of the present invention, in the process unit constituted by a plurality of housings, the first powder conveying member for conveying the powder in the first housing and the second for conveying the powder in the second housing. Drive can be transmitted to and from the powder conveying member.

Also in the image forming apparatus provided with a process unit of the present invention can exhibit the same effect as the flop Rosesuyunitto.

1 is a schematic cross-sectional view of an image forming apparatus provided with the powder conveyance device of the present invention as a toner conveyance device. FIG. 2 is an exploded perspective view of a process unit provided in the image forming apparatus. It is XX arrow sectional drawing of FIG. It is a perspective view which shows the state which exposed the inside of the left surface support member of the said process unit. It is a perspective view of the left surface support member. It is a perspective view which shows the principal part of the said left surface support member, Comprising: Specifically, it is a perspective view which shows the protrusion before winding a sealing member. It is a perspective view which shows the state which wound the said sealing member around the said protrusion. It is a principal part enlarged view of the said sealing member. It is a perspective view which shows a mode that the developing unit and left surface support member of the said process unit are assembled | attached. FIG. 2 is a perspective view showing a main part of the developing unit and a left side support member, and more specifically, a perspective view showing a connecting structure of a stirring screw and a power transmission shaft. It is sectional drawing which shows the principal part of FIG. It is the perspective view which looked at FIG. 9 from another angle. It is the comparison figure which compared the space | interval dimension of the said protrusion and a hole, and the thickness of a sealing member. It is sectional drawing of the said sealing member, a protrusion, and a hole. It is sectional drawing which shows the modification of FIG. It is a principal part enlarged view which shows other embodiment of the said sealing member. It is a principal part enlarged view which shows the contact area | region of the said sealing member and a hole. (A) is a principal part enlarged view which shows the comparative example of the said contact area, (b) is a principal part enlarged view which shows the other comparative example of a contact area. It is a principal part enlarged view which shows other embodiment of the said contact area. It is a principal part enlarged view which shows the contact area | region of the said seal member and hole at the time of employ | adopting the seal member of FIG.

  FIG. 1 is a cross-sectional view schematically showing an image forming apparatus according to the present invention. Hereinafter, main parts of the image forming apparatus will be described with reference to FIG. The image forming apparatus includes four process units 1K, 1C, 1M, and 1Y for forming images with developers of black, cyan, magenta, and yellow corresponding to color separation components of a color image.

  The process units 1K, 1C, 1M, and 1Y have the same configuration except that they store different color toners. The configuration of one process unit 1K will be described as an example. The process unit 1K includes an image carrier 2, a cleaning unit 3, a charging unit 4, a developing unit 5, and the like. The process unit 1K is detachably attached to the main body of the image forming apparatus and can be replaced at a time.

  An exposure unit 7 is disposed above each process unit 1K, 1C, 1M, 1Y. The exposure device 7 is configured to emit laser beams (L1 to L4) from a laser diode based on image data.

  A transfer device 8 is disposed below each process unit 1K, 1C, 1M, 1Y. The transfer device 8 is opposed to the four primary transfer rollers 9 that face each image carrier 2, the intermediate transfer belt 12 that runs around each primary transfer roller 9, the drive roller 10, and the driven roller 11, and the drive roller 10. A secondary transfer roller 13, a belt cleaning device 14 for removing toner remaining on the intermediate transfer belt 12, a cleaning backup roller 15, and the like.

  At the bottom of the image forming apparatus, a paper feed cassette 16 capable of storing a large number of sheets as a sheet-like recording medium and a paper feed roller 17 for feeding the paper from the paper feed cassette 16 are provided. On the way from the paper feed roller 17 to the nip between the secondary transfer roller 13 and the driving roller 10, a registration roller pair 18 for temporarily stopping the paper is provided.

  A fixing device 19 is disposed above the nip between the secondary transfer roller 13 and the driving roller 10. The fixing device 19 includes a fixing roller 19a that includes a heat source such as a halogen lamp (not shown), and a pressure roller 19b that rotates while contacting the fixing roller 19a with a predetermined pressure.

  Above the fixing device 19, a pair of paper discharge rollers 20 for discharging the paper to the outside is disposed. The paper discharged by the paper discharge roller pair 20 is configured to be stacked on a paper discharge tray 21 formed by recessing the upper cover inward.

  Between the transfer device 8 and the paper feed cassette 16, a waste toner container 22 for storing waste toner is disposed. A waste toner transfer hose (not shown) extending from the belt cleaning device 14 is connected to the entrance of the waste toner container 22.

Hereinafter, the configuration of the process unit 1 (1K, 1C, 1M, 1Y) will be described in detail.
FIG. 2 is an exploded perspective view of the process unit. As shown in the figure, the process unit 1 includes a developing unit 100, an image carrier unit 101, a left side support member 102 and a right side support member 103 that support the units 100 and 101.

  The housings 102a and 103a of the left surface support member 102 and the right surface support member 103 have bearings 50R and 50L that support both ends (only the right end 2R is shown in FIG. 2) of the rotation shaft of the image carrier 2 included in the image carrier unit 101. Is arranged. Bosses 51 </ b> R and 51 </ b> L are provided on the upper portions of both side surfaces of the developing unit 100. Slide engagement portions 52R and 52L that support the bosses 51R and 51L are disposed on the left surface support member 102 and the right surface support member 103, respectively. The slide engaging portions 52R and 52L are formed in a long hole shape extending in the vertical direction. By the engagement between the slide engaging portions 52R and 52L and the bosses 51R and 51L, the developing unit 100 is provided with the left side support member 102 and It is slidably supported with respect to the right support member 103.

  Further, bearings (only the left bearing 53L is shown in FIG. 4) for supporting both ends 5R and 5L of the rotation shaft of the developing roller 55 of the developing unit 100 are provided in the housings 102a and 103a of the left support member 102 and the right support member 103, respectively. It is arranged. The bearings are pressed downward by a pressing spring (only the left pressing spring 54L is shown in FIG. 4). The developing roller 55 can be slightly rotated and brought into pressure contact with the image carrier 2 by sliding movement of the bosses 51R and 51L with respect to the slide engaging portions 52R and 52L and the elastic biasing force of the pressing spring. . Further, the developing roller 55 can be forcibly separated from the image carrier 2 by sandwiching, for example, a wedge-shaped padding on the opposite side of the bearing 53L from the side pressed by the pressing spring 54L. By doing so, it is possible to prevent plastic deformation due to constant pressure contact between the developing roller 55 and the image carrier 2 at the time of shipment or the like.

  3 is a cross-sectional view taken along line XX in FIG. As shown in FIG. 3, the developing roller 55 of the developing unit 5 is disposed below the housing 100 a of the developing unit 100. A toner container 6 is disposed in the housing 100a. The toner storage unit 6 includes an unused toner storage chamber 24 filled with toner of each color and a waste toner storage chamber 25 that stores waste toner. A space between the unused toner storage chamber 24 and the waste toner storage chamber 25 is provided. These are separated by a flexible partition member 23.

  The partition member 23 is, for example, a plastic sheet-like member, and can be displaced to the unused toner storage chamber 24 side and the waste toner storage chamber 25 side. When unused toner in the unused toner storage chamber 24 decreases and waste toner is collected in the waste toner storage chamber 25, the partition member 23 is gradually pushed down by the weight of the collected waste toner. ing.

  In the waste toner storage chamber 25, a conveyance screw 28 for carrying waste toner from the outside and a stirring screw 29 for conveying the waste toner while stirring in the waste toner storage chamber 25 are disposed. That is, the waste toner storage chamber 25 is a toner transport path for transporting waste toner by the transport screw 28 and the stirring screw 29, and also functions as a storage space for storing the transported waste toner.

  An image carrier 2, a cleaning unit 3, a charging unit 4, and the like are attached to the housing 101 a of the image carrier unit 101. Below the cleaning means 3, a toner receiving portion 30 that receives waste toner extends in the horizontal direction, and a transport coil 26 is rotatably accommodated in the toner receiving portion 30. The toner receiver 30 functions as a powder conveyance path for conveying the toner in the horizontal direction by the conveyance coil 26.

  FIG. 4 shows a state in which the inside of the housing 102a of the left support member 102 is exposed. As shown in FIG. 4, an annular groove 31 as a powder conveyance path is formed in the housing 102 a of the left support member 102, and the conveyance belt 27 is configured to circulate along the annular groove 31. The conveyor belt 27 is an endless belt, and a plurality of irregularities are formed on the outer circumferential conveyor surface of the conveyor belt 27. Waste toner is held and conveyed between the uneven portion of the conveying belt 27 and the peripheral wall 31a forming the annular groove 31. Further, a notch 31b is provided at the upper end of the peripheral wall 31a forming the annular groove 31, and a toner receiving portion 34 is disposed below the notch 31b.

  The conveyor belt 27 is stretched between an upper power transmission shaft 32 (driving means) rotatably provided in the annular groove 31 and a lower roller 33. As described above, the conveyance belt 27 is configured to be stretched by two axes, but may be configured to be stretched by three or more axes.

The basic operation of this image forming apparatus will be described below.
In FIG. 1, when a paper feed roller 17 is rotated by a paper feed signal from a control unit of an image forming apparatus (not shown), only the topmost paper stacked on the paper feed cassette 16 is separated to the registration roller pair 18 side. Sent out. When the leading edge of the paper reaches the nip of the pair of registration rollers 18, in order to take timing (synchronization) with the toner image formed on the intermediate transfer belt 12, the printer waits in a state where slack is formed on the paper.

Next, an image forming operation will be described.
The process unit 1K will be described as an example. First, the charging unit 4 charges the surface of the image carrier 2 to a uniform high potential. Based on the image data, the surface of the image carrier 2 is irradiated with the laser beam L1 from the exposure device 7, and the potential of the irradiated portion is lowered to form an electrostatic latent image. The toner is transferred to the surface portion of the image carrier 2 on which the electrostatic latent image is formed by the developing means 5 to form (develop) a black toner image. Then, the toner image formed on the image carrier 2 is transferred to the intermediate transfer belt 12. In the other color process units 1C, 1M, and 1Y, toner images are similarly formed on the image carrier 2 and transferred to the intermediate transfer belt 12 so that the four color toner images overlap.

  The registration roller pair 18 and the paper feed roller 17 resume driving, and the paper is sent to the secondary transfer roller 13 in synchronization with the toner image superimposed on the intermediate transfer belt 12. Then, the secondary transfer roller 13 transfers the toner image superimposed and transferred onto the fed paper.

  The sheet on which the toner image has been transferred is conveyed to the fixing device 19. The sheet sent to the fixing device 19 is sandwiched between the fixing roller 19a and the pressure roller 19b, and the unfixed toner image is heated and pressed to be fixed on the sheet. The sheet on which the toner image is fixed is sent out from the fixing device 19 to the discharge roller pair 20 and is discharged to the discharge tray 21 by the discharge roller pair 20.

  Further, after the toner image on the intermediate transfer belt 12 is transferred to the paper, residual toner is adhered on the intermediate transfer belt 12, and this residual toner is removed from the intermediate transfer belt 12 by the belt cleaning device 14. . The toner removed from the intermediate transfer belt 12 is conveyed to a powder container 22 and collected by waste toner conveying means (not shown).

  Each cleaning unit 3 removes residual toner adhering to the surface of the image carrier 2 after the intermediate transfer process. Thereafter, a neutralization device (not shown) neutralizes residual charges on the image carrier 2 after cleaning.

  The toner removed by the cleaning unit 3 is received by the toner receiver 30 (see FIG. 3). The waste toner is conveyed to the lower end of the annular groove 31 by the conveyance coil 26 rotating in the toner receiving portion 30 (see FIG. 4), and is conveyed upward in the annular groove 31 by the conveyance belt 27. Waste toner transported by the transport belt 29 falls at the notch 31 b at the upper end of the annular groove 31 and is received by the toner receiving portion 34. Then, the waste toner received by the toner receiver 34 is carried into the waste toner storage chamber 25 from the hole 45 (see FIG. 9) for introducing the toner by the rotating conveying screw 28.

  By the way, although each spiral part of the conveyance screw 28 and the stirring screw 29 is formed in the same direction, it mutually reversely rotates. That is, the conveying screw 28 carries the waste toner to the far side away from the hole 45 (see FIG. 9) of the waste toner storage chamber 25, and the agitating screw 29 removes the waste toner carried by the conveying screw 28. The waste toner storage chamber 25 is transferred to the front side near the hole 45. In this way, by transferring the waste toner in the opposite directions by the conveying screw 28 and the stirring screw 29, the deformable partition member 23 can be efficiently inflated downward to contain the waste toner while stirring the waste toner. it can.

  FIG. 5 is a perspective view of the left support member 102. As shown in the figure, the housing 102 a of the left support member 102 includes a case 35 (see FIG. 4) in which the annular groove 31 is formed, and a lid member 36 engaged with the case 35. On the outer surface of the lid member 36, a protrusion 39 having a hole 39a (long hole) is provided. An insertion port 37 for projecting the power transmission shaft 32 to the outside and a transport port 38 for transporting the waste toner are disposed adjacent to each other in the hole 39a of the protrusion 39. An arc-shaped partition wall 40 is disposed in the hole 39 a of the protrusion 39, and the internal space of the protrusion 39 is partitioned into an insertion port 37 and a conveyance port 38. Further, the conveyance port 38 communicates with the toner receiving portion 34 shown in FIG.

A seal member 41 is attached to the outer peripheral surface of the protrusion 39. FIG. 6 shows the protrusion 39 before the seal member 41 is attached. As shown in the figure, the seal member 41 is formed in a strip shape, and the seal member 41 is wound around the outer peripheral surface of the protrusion 39 (see FIG. 7). Thus, the sealing member 41 can be easily attached to the outer periphery of the protrusion 39 by forming the sealing member 41 in a strip shape. Further, it is desirable that the seal member 41 and the protrusion 39 are bonded via a double-sided adhesive tape or the like. Thereby, it is possible to prevent the seal member 41 from being separated from the outer peripheral surface of the protrusion 39. Further, as the material of the seal member 41, for example, an elastic member such as foamed PUR or rubber is suitable, but any other elastic member or flexible member is adopted as long as it has appropriate elasticity or flexibility. Is possible.

  Both end surfaces 41 a and 41 b of the seal member 41 have a convex surface 42, a concave surface 44, and a mating surface 43 that connects the convex surface 42 and the concave surface 44. Each mating surface 43 is disposed so as to intersect the width direction A of the seal member 41. In FIG. 6, the mating surface 43 is disposed in a direction substantially orthogonal to the width direction A. The concave surface 44 of the other end surface 41b is disposed on the opposite side of the convex surface 42 of the one end surface 41a, and the convex surface 42 of the other end surface 41b is disposed on the opposite side of the concave surface 44 of the one end surface 41a.

The length N1 from each convex surface 42 to the opposite concave surface 44 is set somewhat shorter than the outer peripheral dimension M of the protrusion 39. Therefore, when the seal member 41 is wound around the outer peripheral surface of the protrusion 39, a gap S is formed between the convex surface 42 and the concave surface 44 facing the main surface of FIG. 7, as shown in FIG. It has become. By providing the clearance S in this way, the seal member 41 can be reliably wound without partially floating on the outer peripheral surface of the protrusion 39. Thereby, it is possible to prevent the toner from leaking from between the outer peripheral surface of the protrusion 39 and the seal member 41.

  The length N2 from one convex surface 42 to the other convex surface 42 is set to be longer than the outer peripheral dimension M of the protrusion 39. Thereby, when the sealing member 41 is wound around the outer peripheral surface of the protrusion 39, the mating surfaces 43 and 43 can be brought into contact with each other (see FIG. 8). In addition, you may adhere | attach between the mating surfaces 43 and 43 with a double-sided adhesive tape.

Thus, by bringing the mating surfaces 43 and 43 into contact with each other, it is possible to prevent toner from leaking from between both end surfaces of the seal member 41. Even when the mating surfaces 43 are not brought into contact with each other, the gap between both end surfaces of the seal member 41 has a complicated shape, so that it is possible to prevent the toner from leaking from between both end surfaces.

  Further, the seal member 41 is narrower or stringer than that of FIG. 6 and is wound around the outer peripheral surface of the projection 39 a plurality of times, or in a loop shape other than the strip shape, fitted to the outer peripheral surface of the projection 39. Or may be formed in other shapes. Further, a plurality of the convex surfaces 42, the concave surfaces 44, or the mating surfaces 43 may be arranged in the width direction A on each end surface 41 a, 41 b of the seal member 41.

When a structure having a plurality of housings 100a and 102a is employed as in the process unit of the present invention, the powder conveyance path disposed in the process unit must also be disposed separately for each housing 100a and 102a. In that case, when assembling the housings, a structure that allows easy and reliable attachment and detachment of the powder conveyance paths is required.

Therefore, as shown in FIG. 9, a hole 45 through which the protrusion 39 around which the seal member 41 is wound can be inserted in the side surface of the developing unit 100 facing the left support member 102. When the protrusion 39 is inserted into the hole 45 in association with the assembling operation of the housing 100a and the housing 102a, the powder conveyance paths in the housings 100a and 102a communicate with each other. Thereby, powder conveyance paths can be comprised easily and reliably so that attachment or detachment is possible. Further, when assembling the housings 100a and 102a, the powder conveyance paths in the housings 100a and 102a can be easily communicated with each other, so that the assemblability can be improved.

In addition, since the seal member 41 is attached to the outer peripheral surface of the protrusion 39, when the protrusion 39 is inserted into the hole 45, it is between the outer peripheral surface of the protrusion 39 and the inner peripheral surface of the hole 45. The sealing member 41 seals. Thereby, it is possible to prevent the powder in the powder conveyance path of the housings 100a and 102a from leaking to the outside and to prevent foreign matter from entering the powder conveyance path from the outside. Further, since the seal member 41 is made of an elastic member, when the protrusion 39 is inserted into the hole 45, the seal member 41 can be compressed and deformed, and the protrusion 39 can be smoothly inserted into the hole 45. . Further, after the protrusion 39 is inserted into the hole 45, the seal member 41 is brought into close contact with the inner peripheral surface of the hole 39 due to its restoring force, so that the outer peripheral surface of the protrusion 39 and the inner peripheral surface of the hole 45 are It is possible to reliably seal the gap.

As shown in FIG. 9, the hole 45 communicates with the waste toner storage chamber 25 in the developing unit 100, and the ends of the conveying screw 28 and the stirring screw 29 protrude from the hole 45. An end protruding from the hole 45 of the stirring screw 29 can be connected to the power transmission shaft 32. A driving gear is connected to an end (not shown) of the stirring screw 29 opposite to the power transmission shaft 32, and the rotational movement of the driving gear is transmitted to the conveying belt 27 via the stirring screw 29 and the power transmission shaft 32. (See FIG. 4).

The stirring screw 29 and the power transmission shaft 32 are connected by a coupling. Specifically, as shown in FIG. 10, the power transmission shaft 32 has an insertion shaft 32 a that extends toward the stirring screw 29. The insertion shaft 32a has an engaging male portion 32b formed by forming a plurality of convex portions extending in the axial direction in the circumferential direction, and a pin-shaped guide portion 32c extending in the axial direction from the tip of the engaging male portion 32b. Is provided. On the other hand, an insertion port 29a for inserting the insertion shaft 32a of the power transmission shaft 32 is formed at the end of the stirring screw 29 on the power transmission shaft 32 side. The insertion opening 29a is provided with an engagement female portion (not shown) that engages with the engagement male portion 32b of the insertion shaft 32a. Thus, by connecting the stirring screw 29 and the power transmission shaft 32 by coupling, they can be connected in a space-saving manner.

The end portion of the conveying screw 28 protruding outward from the hole 45 passes through the conveying port 38 and is disposed in the toner receiving portion 34 in the left support member 102 (see FIG. 4). That is, when the conveyance screw 28 is an insertion shaft, the conveyance port 38 is an insertion port for the conveyance screw 38 and can be inserted into and removed from each other. An interference portion 56 is projected from the inner peripheral surface of the insertion port 37 so that the conveyance screw 28 is not erroneously inserted into the insertion port 37 adjacent to the conveyance port 38 (see FIG. 7). As a result, when the conveyance screw 28 is about to be inserted into the insertion port 37 by mistake, the tip of the conveyance screw 28 comes into contact with the interference portion 56 to prevent erroneous insertion into the insertion port 37.

  As shown in FIG. 11, in the state where the protrusion 39 is disposed so as to face the hole 45, the distance Y1 between the power transmission shaft 32 and the agitation screw 29 (the insertion port 29 a) is set to the conveyance port 38 and the conveyance screw. 28 is set to be shorter than the distance Y2 from the distance 28. This long / short relationship may be reversed. In this case, the distance dimension Y1 is set longer than the distance dimension Y2.

Thus, the power transmission shaft 32 and the conveying screw are made different by making the distance dimension Y1 between the power transmission shaft 32 and the stirring screw 29 (the insertion port 29a thereof) different from the distance dimension Y2 between the conveyance port 38 and the conveyance screw 28. 28 can be inserted in sequence. That is, since they are not inserted simultaneously, they can be easily inserted. Similarly, in the case of having an insertion shaft other than the power transmission shaft 32 and the conveying screw 28 and an insertion port other than the insertion port 29a and the conveying port 38 of the stirring screw 29, the interval between the insertion shaft and the corresponding insertion port is also the same. By setting the dimensions to be different for each group, it is possible to insert them easily.

  In FIG. 12, a contact portion 49 is disposed at the lower portion of the inner peripheral surface of the hole 45. The width W1 of the contact portion 49 is set larger than the width W2 of the other inner peripheral surface portion. Further, when the seal member 41 is wound around the protrusion 39, both end faces 41 a and 41 b of the seal member 41 are opposed to each other at the lower part of the protrusion 39. By winding the seal member 41 in this way, both end surfaces 41 a and 41 b of the seal member 41 are arranged corresponding to the contact portions 49 when the protrusion 39 and the hole 45 are arranged to face each other. I try to do it.

Thus, by providing the contact portion 49 that contacts the outer peripheral surface in the vicinity of the opposite end faces 41a and 41b of the seal member 41 on the inner peripheral surface of the hole 45, the protrusion 39 is formed in the hole 45. In the inserted state, the contact portion 49 comes into contact with the outer peripheral surfaces in the vicinity of the opposite end faces 41a and 41b of the seal member 41, and effectively prevents the toner from leaking from the vicinity of both end faces 41a and 41b of the seal member 41. can do.

FIG. 13 is a diagram in which the protrusion 39 around which the seal member 41 is wound is associated with the hole 45. As shown in the figure, the outer peripheral shape of the protrusion 39 and the inner peripheral shape of the hole 45 are formed to be similar to each other, and the outer peripheral surface of the protrusion 39 is spaced from the inner peripheral surface of the hole 45. Smaller than D. The thickness T of the seal member 41 is set to be larger than the interval dimension D. When the protrusion 39 is inserted into the hole 45, the seal member 41 is compressed in the radial direction . Thereby, the space between the outer peripheral surface of the protrusion 39 and the inner peripheral surface of the hole 45 can be reliably sealed. Further, since the inner peripheral shape of the hole 45 and the outer peripheral shape of the protrusion 39 are formed to be similar to each other, when the protrusion 39 is inserted into the hole 45, the amount of compression in the radial direction of the seal member 41 is reduced. It becomes uniform over the circumferential direction. That is, since the seal member 41 is not greatly compressed and deformed locally, a gap is not generated between the outer peripheral surface of the seal member 41 and the inner peripheral surface of the hole 45, and the seal can be reliably performed.

  Hereinafter, the direction in which the protrusion 39 is inserted into the hole 45 will be referred to as the insertion direction. As shown in the cross-sectional view of FIG. 14, an inclined surface 46 that is reduced in diameter in the insertion direction B is formed in an annular shape partially or entirely on the outer peripheral surface of the protrusion 39 on the insertion direction side B (tip). Yes.

  In addition, as shown in FIG. 15, without forming the inclined surface 46 on the protrusion 39, an inclined surface 47 whose diameter is reduced in the insertion direction B is partially or on the outer peripheral surface of the sealing member 41 on the insertion direction B side. You may form cyclically | annularly over the perimeter. Or you may form the inclined surface 48 diameter-reduced in the insertion direction B to the inner peripheral surface (including the contact part 49) of the hole part 45 cyclically | annularly over a part or whole periphery. Moreover, you may form the cross-sectional shape of each inclined surface 46, 47, 48 into a curved shape etc. other than a taper shape.

As described above, toward the insertion direction B in which the protrusion 39 is inserted into the hole 45 on at least one of the outer peripheral surface of the protrusion 39, the outer peripheral surface of the seal member 41, and the inner peripheral surface of the hole 45. By forming the inclined surface inclined so as to reduce the diameter, the seal member 41 is easily compressed and deformed in the radial direction when the protrusion 39 is inserted into the hole 45. This makes it easy to insert the protrusion 39 into the hole 45.

  FIG. 16 shows another embodiment of the seal member 41. This figure shows the opposite end faces 41a and 41b when the seal member 41 is wound around a projection 39 (not shown). In the embodiment of FIG. 16, the respective mating surfaces 43, 43 are arranged to be inclined with respect to the width direction A, and the widths X1, X2 of the seal member 41 are reduced from the concave surface 44 side to the convex surface 42 side, respectively. Is formed. Also in the embodiment of FIG. 16, as in the embodiment of FIG. 8, the mating surfaces 43 and 43 can be in contact with each other, and a gap S is formed between the convex surface 42 and the concave surface 44 that face each other. However, the gap S in FIG. 16 is shorter in the width direction A than the gap S in FIG.

  Further, the convex surface 42 and the concave surface 44 may be disposed to be inclined with respect to the width direction A. Further, the convex surface 42, the mating surface 43, and the concave surface 44 may be curved surfaces in addition to the flat surfaces.

Hereinafter, a method of assembling the developing unit and the left support member will be described.
As shown in FIG. 9, a left surface support member 102 is disposed to face the left side surface of the development unit 100, and the development unit 100 and the left surface support member 102 are brought close to each other. Along with this, the power transmission shaft 32 approaches the insertion port 29 a of the stirring screw 29, and the conveying screw 28 also approaches the conveying port 38.

  As shown in FIG. 11, the distance Y1 between the power transmission shaft 32 and the stirring screw 29 is set to be shorter than the distance Y2 between the conveyance port 38 and the conveyance screw 28, so that the power transmission shaft 32 is first stirred. The screw 29 is inserted into the insertion port 29a. Next, the conveying screw 28 is inserted into the conveying port 38. When the above-described long / short relationship is reversed, the conveying screw 28 is inserted into the conveying port 38 first.

  The developing unit 100 and the left support member 102 are further brought closer to each other, and the protrusion 39 is inserted into the hole 45. At this time, the seal member 41 wound around the protrusion 39 is pressed against the inner peripheral surface of the hole 45 and compressed.

  When the developing unit 100 and the left support member 102 are brought close to a predetermined position, the boss 51L on the left side of the developing unit 100 is inserted into the slide engaging portion 52L, and the left end 5L of the rotation shaft of the developing roller 55 is a bearing. 53L (see FIGS. 2 and 4). Then, the developing unit 100 and the left surface support member 102 are engaged and assembled by a not-illustrated uneven engagement provided on the respective units.

  With the assembly completed, the power transmission shaft 32 and the agitation screw 29 are engaged and connected as shown in FIG. Further, the end portion of the conveying screw 28 passes through the conveying port 38 and is accommodated in the toner receiving portion 34 in the left surface support member 102.

  Further, in the state where the assembly is completed, the outer peripheral surface of the seal member 41 is in close contact with the inner peripheral surface of the hole 45 over the entire circumference. Further, the outer peripheral surfaces in the vicinity of the opposite end surfaces 41a and 41b of the seal member 41 are in close contact with the contact portion 49 of the hole 45 in the range indicated by the oblique lines in FIG. As described above, the outer peripheral surfaces in the vicinity of the both end faces 41a and 41b of the seal member 41 in which the gaps S1 and S2 may be generated are brought into close contact with the contact part 49 of the hole 45 in the width direction A, whereby the gap S1. , S2 can prevent toner leakage. Further, since the mating surfaces 43 of the seal member 41 are in close contact with each other, the gap between the outer peripheral surface of the protrusion 39 and the inner peripheral surface of the hole 45 can be reliably sealed.

  In FIG. 17, the arrow B is the insertion direction of the protrusion 39 with respect to the hole 45, the front in the insertion direction is the back side, and the rear in the insertion direction is the front side. That is, the upper side of the figure is called the back side, and the lower side of the figure is called the near side. As shown in the figure, gaps S1 and S2 are disposed between the convex surface 42 and the concave surface 44 which face each other. In this case, the front end 45a of the contact region C (contact region) between the outer peripheral surface of the protrusion 39 and the inner peripheral surface (contact portion 49) of the hole 45 is located closer to the front side than the back side gap S1. It is arranged. On the other hand, the end 45b on the back side of the contact area C is arranged on the back side from the gap S2 on the near side. As a result, waste toner does not leak outside through the gaps S1 and S2.

  In this embodiment, there is a waste toner storage chamber 25 that collects waste toner on the back side of the seal member 41, and therefore waste toner may enter the back side gap S1. However, since the gap S1 on the back side does not open to the front side (outside), waste toner does not leak to the outside (front side) from the gap S1. Further, the front side gap S2 opens to the outside, but since it does not open to the back side (inside), the waste toner does not leak from the gap S2.

On the other hand, when the contact area C is narrow in the width direction A, the contact area C may be arranged at the position shown in FIG.
First, in the embodiment of FIG. 18A, the end portion 45a on the near side of the contact region C is not disposed on the near side with respect to the gap S1 on the back side, and the end portion 45a and the gap S1 intersect each other. Yes. Accordingly, in this case, the gap S1 opens on both the back side and the near side, and there is a possibility that the waste toner passes through the gap S1 and leaks to the outside.

  In the embodiment of FIG. 18B, the end 45b on the back side of the contact region C is not arranged on the back side from the gap S2 on the near side, and intersects the gap S2. Therefore, in this case, since the gap S2 opens on both the back side and the near side, there is a possibility that the waste toner passes through the gap S2 and leaks to the outside.

  Further, even if the contact area C is not widened in the width direction A as shown in FIG. 17, if the contact area C is arranged as shown in FIG. 19, leakage of waste toner can be prevented. That is, if the end 45a on the near side of the contact area C is disposed on the near side of the gap S1 on the back side, the end 45b on the far side of the contact area C is disposed on the back side with respect to the gap S2 on the near side. Good. However, in this case, it is preferable to provide a positioning mechanism in the insertion direction B so that the outer peripheral surface of the seal member 41 and the inner peripheral surface of the hole 45 can come into contact at such a position (contact region C).

  In the embodiment shown in FIG. 16, the gap dimension in the width direction A between the two gaps S1 and S2 is wider than the gap dimension between the gaps S1 and S2 in the embodiment shown in FIG. . In this case, as shown in FIG. 20, although the contact area C is narrow in the width direction A, the waste toner leaks even if the contact area C is displaced from the position C1 on the back side to the position C2 on the near side. Can be prevented. That is, even when the contact area C is narrow in the width direction A, if the seal member 41 shown in FIG. 20 is employed, the permissible range of positioning error in the insertion direction B of the seal member 41 and the hole 45 can be expanded. There is.

  When the development unit 100 and the right side support member 103 are assembled, as shown in FIG. 2, the development unit 100 and the right side support member 103 are arranged to face each other. The developing unit 100 and the right support member 103 are brought close to each other, and the right boss 51R of the developing unit 100 is inserted into the slide engaging portion 52R, and the right end 5R of the developing roller 55 is inserted into a bearing (not shown). Then, the developing unit 100 and the right surface support member 103 are engaged and assembled by a not-shown uneven engagement or the like provided in each.

  When assembling the image carrier unit 101 and the left support member 102, the image carrier unit 101 and the left support member 102 are brought into engagement with each other from the state shown in FIG. At this time, the left end (not shown) of the rotation shaft of the image carrier 2 is inserted into the bearing 50 </ b> L of the left surface support member 102. Further, a connection port 57 that communicates with the left end of the toner receiving portion 30 (see FIG. 3) of the image carrier unit 101 and a connection port 58 that communicates with the lower end of the annular groove 31 (see FIG. 4) of the left support member 102 are connected. Is done.

  Further, as shown in FIG. 2, the image carrier unit 101 and the right surface support member 103 are arranged so as to face each other. Then, the image carrier unit 101 and the right support member 103 are brought close to each other and engaged. At this time, the right end 2R of the rotation shaft of the image carrier 2 is inserted into the bearing 50R of the right surface support member 103.

  As described above, in a state where the developing unit 100 is assembled to the left side support member 102 and the right side support member 103, the development unit 100 is allowed to be slightly displaced in the vertical direction with respect to both the support members 102 and 103. . In the state where the developing unit 100 and the left support member 102 are assembled, the protrusion 39 is connected to the hole 45 via the seal member 41 made of an elastic member, so the protrusion 39 is inserted into the hole 45. Relative displacement is possible in a direction perpendicular to the direction. Therefore, the operation of causing the housing 100a of the developing unit 100 to follow in order to allow the developing roller 55 to approach and contact the image carrier 2 by the elastic biasing force of the pressing spring 54L shown in FIG. The seal member 41 is preferably made of a material having a degree of flexibility that allows the follow-up movement of the developing unit 100 by the elastic biasing force of the pressing spring 54L. As a material of the seal member 41, for example, foam PUR having excellent flexibility is suitable. Further, the flexibility of the sealing member 41 can be adjusted by changing the foaming rate.

  In the above-described embodiment, when the left support member 102 is the first housing and the developing unit 100 is the second housing, the powder conveyance paths of both housings are connected to each other by the protrusions, the holes, and the seal member. Have explained. However, the present invention is not limited to the above-described embodiment. The first housing and the second housing are interchanged, and a protrusion is provided on the side surface of the developing unit 100, and a hole is formed in the left support member 102. May be. Moreover, you may attach a sealing member to the internal peripheral surface of a hole. Alternatively, the first housing can be the left support member 102 and the second housing can be the image carrier unit 101.

  The process unit of the above-described embodiment is formed by integrally forming the image carrier 2, the cleaning unit 3, the charging unit 4, the developing unit 5, and the toner storage unit 6, but the toner storage unit 6 and the other 4 units are the same. At least one of the two members may be integrally formed. Alternatively, it may be a process unit in which the cleaning unit 3, the charging unit 4, the developing device 4, the image carrier 2, and the toner storage unit 6 are integrally formed. Alternatively, the process unit may have a member other than the members described above.

  Further, the structure of the projection and the hole of the present invention has a powder conveyance path disposed independently of the image carrier 2, the cleaning unit 3, the charging unit 4, the developing unit 5, and the toner storage unit 6. You may apply to a powder conveying apparatus. Further, this powder conveying apparatus may be provided in an apparatus other than the process unit and the image forming apparatus, and can also be used for conveying powder other than toner.

DESCRIPTION OF SYMBOLS 1 Process unit 2 Image carrier 3 Cleaning means 4 Charging means 5 Developing means 6 Toner accommodating part
27 Conveying belt 28 Conveying screw (insertion shaft)
29 Stirring screw 29a Insertion slot
31 annular groove 32 power transmission shaft 32a insertion shaft
32b engaging male part 38 Conveying port (insertion port)
39 Projection 39a Hole 41 Seal member 41a, 41b End 42 Convex surface 43 Matching surface 44 Concave surface 45 Hole 45a Front end 45b Back end 46, 47, 48 Inclined surface 49 Abutment 56 Interference A Width direction B Insertion direction C Contact area D Spacing dimension N1, N2 Length M Perimeter dimension S Clearance T Thickness W1, W2 Width X1, X2 Width Y1, Y2 Spacing dimension

JP-A-2-171791

Claims (5)

A process unit configured to be detachable from the image forming apparatus,
A first housing and a second housing having a powder conveyance path therein;
The first housing includes a first powder conveying member that conveys powder inside the first housing, and a power transmission member that transmits power to the first powder conveying member is provided on an outer surface of the first housing. Protruding from the hole provided,
The second housing includes a second powder conveying member that conveys powder inside the second housing,
The power transmission member has an insertion shaft extending toward the second powder conveyance member, and an engagement male portion formed by forming a plurality of convex portions extending in the circumferential direction on the insertion shaft. Is provided,
The engaging male part engages with an engaging female part provided in an insertion port formed at the end of the second powder conveying member on the power transmitting member side, so that the power transmitting member and the first powder transmitting member are engaged with each other. Two powder conveying members are configured to be connected,
The process unit characterized in that the rotational movement of the second powder conveying member is transmitted to the first powder conveying member via the power transmission member.   The process unit according to claim 1, wherein the first housing and the second housing are detachably assembled to each other. The first powder conveying member is a conveying belt;
The process unit according to claim 1 or 2, wherein an annular groove as a powder conveyance path is formed in the first housing, and the conveyance belt is configured to circulate along the annular groove. The second powder conveying member is a conveying screw,
4. The process unit according to claim 1, wherein an end of the conveying screw on the power transmission shaft side protrudes from the second housing. 5. An image forming apparatus comprising the process unit according to claim 1.

Images