JP5239990B2 - Liquid material application method - Google Patents

Description

  The present invention relates to a liquid material application method, a sealing structure, and a cleaning device.

  Patent Document 1 describes a configuration in which liquid elastomer is applied between constituent members of a developing device to prevent toner from flowing out between members.

JP 2006-208552 A

  The present invention relates to a method for applying a liquid material that can be applied in a liquid state, has elasticity even when cured, and changes its shape by an external force, and allows easy adjustment of the amount of application at each location on the coating line. It aims at providing the sealing structure in which the liquid material was apply | coated by the apply | coating method, and the cleaning apparatus which has this sealing structure.

The liquid material application method according to claim 1 is:
A point application process in which a liquid material that is applied in a liquid state and has elasticity even when cured on a part of a coating line determined on a member and changes in shape by an external force is applied in a point form;
It is characterized in that the application location changing process of changing the location applied in the spot shape in the dotted application process to the location where the liquid material is not applied on the application line is alternately performed.

The liquid material application method according to claim 2 is:
It has the overcoating process which coat | covers a liquid material further on the liquid material already apply | coated on the said coating line in the shape of a dot.

The liquid material application method according to claim 3 is:
The above-mentioned member sandwiches the applied liquid material between another member and seals the gap between this other member with this liquid material and the gap between this member and this other member. The spacing is uneven,
It is characterized in that it has a recoating process in which the liquid material is further applied in the form of dots on the already applied liquid material at a position where the gap is wider than the other places among the places on the coating line. .

The liquid material application method according to claim 4 is:
Having a failure detection process for detecting whether or not the dot application in the dot application process has failed,
The dot application process is a process of redoing the dot application when a failure is detected in the failure detection process.

The blocking structure according to claim 5 is:
A first member;
A plurality of points arranged in a line on the first member are applied in the form of dots so that they are in contact with each other and are applied in a liquid form. A liquid material whose shape changes due to,
The liquid material is sandwiched between the first member, and a gap between the liquid member and the first member is provided with a second member sealed with the liquid material.

A cleaning device according to claim 6 is:
It is characterized in that the adhering matter on the surface of the object to be cleaned is removed and accommodated in the sealing structure having the sealing structure according to claim 5, and leakage of the adhering matter is prevented.

  According to the method for applying a liquid material according to claim 1, it is easy to adjust the application amount of each liquid material on the application line of a liquid material that is applied in a liquid state, has elasticity even when cured, and changes its shape by an external force. It is.

  According to the liquid material coating method of the second aspect, the adjustment range of the coating amount of the liquid material can be increased.

  According to the liquid material coating method of the third aspect, the sealing property is improved.

  According to the liquid material coating method of the fourth aspect, the liquid material can be reliably coated.

  According to the blocking structure according to the fifth aspect, the blocking property is improved.

  According to the cleaning device of the sixth aspect, it is possible to prevent leakage of deposits housed inside.

1 is a schematic sectional view of an image forming apparatus. It is a front view of a part of the cleaning device. It is a figure which shows the braid | blade support plate of the state which supported the braid | blade. It is a figure which shows a cleaning frame. It is a figure which shows the flow of the assembly method of a cleaning apparatus. It is a figure which shows the narrowed entrance of the cleaning frame. It is a figure which shows a mode that the photosensitive drum was assembled | attached to the holding | maintenance part of the cleaning frame. It is sectional drawing of the cleaning apparatus with which the photoconductive drum was assembled | attached. It is a figure which shows the comparative example of the coating method of a sealing material. It is a conceptual diagram of one Embodiment of the liquid material application | coating method of this invention. It is sectional drawing of the peripheral part where application | coating of the dotted | punctate sealing material was performed. It is a flowchart of the program performed when implementing this sealing material application | coating method.

  Hereinafter, embodiments of the present invention will be described.

  FIG. 1 is a schematic sectional view of the image forming apparatus.

  In the image forming apparatus 1 shown in FIG. 1, an exposure device is applied to the surface of a photosensitive drum 10 to which a predetermined charge is applied by a charging roll 11 and which rotates in the direction of arrow A, based on image data transmitted from the outside. The electrostatic latent image is formed by irradiating the exposure light generated in 12, and the electrostatic latent image is developed with toner accommodated in the developing device 13 having the developing roller 131 that rotates in the direction of arrow C. . The developed image obtained by this development is drawn from a paper cassette (not shown), transferred onto a recording paper conveyed in the direction of arrow B by a transfer roll 14 rotating in the direction of arrow D, and fixed in a fixing device 15. The image is formed on the recording paper by being fixed by. The image forming apparatus 1 is a monochrome image dedicated machine.

  Further, FIG. 1 shows a cleaning device 2 that contacts the portion of the photosensitive drum 10 where the development image has been transferred onto the recording paper and removes the adhering matter adhering to the surface of the photosensitive drum 10. Yes.

  FIG. 2 is a front view of a part of the cleaning device.

  FIG. 2 shows an end portion of the cleaning device 2 when the cleaning device 2 shown in FIG. 1 is viewed from the developing device 13 side through the photosensitive drum 10. Since the cleaning device 2 is symmetrical, only the end portion shown here will be described below.

  The cleaning device 2 includes a cleaning frame 21, a blade 22, a blade support plate 23, a film member 24, and a felt member 25.

  The blade 22 is made of rubber that removes deposits adhering to the surface of the photosensitive drum 10 with which the tip 221 contacts.

  The blade support plate 23 is a metal plate material that supports the blade 22, and is fixed to the cleaning frame body 21 by fastening screws 230.

  The cleaning frame 21 has a recessed space for accommodating deposits removed from the surface of the photosensitive drum 10, and a blade that supports the blade 22 at a part of the periphery of the inlet 210 a (see FIG. 4) of the recessed space. A main body part 210 to which the support plate 23 is screwed and a holding part 211 that rotatably holds both ends of the photosensitive drum 10 are provided. In addition to the boss 2101 used for positioning the blade support plate 23, the main body 210 is also provided with a boss 2102 used for positioning for arranging the cleaning frame 21 at a predetermined position in the image forming apparatus 1. Yes. In addition, as will be described in detail later, the screw support of the blade support plate 23 supporting the blade 22 to the cleaning frame body 21 is applied in liquid form to the periphery of the inlet 210a of the cleaning frame body 21 and has elasticity even when cured. This is performed while sandwiching a sealing material 20 (see FIG. 6) made of a thermoplastic elastomer which is an example of a liquid material whose shape is changed by an external force. 21 and the blade support plate 23 are prevented from leaking.

  The felt member 25 includes two layers, a felt layer 251 and an elastic layer 252 (see FIG. 7). The elastic layer 252 is slightly held by the photosensitive drum 10 held by the holding portion 211 of the cleaning frame body 21. The thickness is crushed. As a result, the felt layer 251 is in close contact with the photosensitive drum 10, thereby preventing deposits from leaking in a direction perpendicular to the rotation direction of the photosensitive drum 10.

  Further, the felt member 25 is provided with a protruding portion 250 protruding toward the center of the inlet 210a of the cleaning frame 21. FIG. 2 shows a state in which the side surface of the protruding portion 250 and the side surface on the blade side of the felt member 25 other than the protruding portion 250 are attached to the corners of the blade 22. Thereby, the leakage of the deposits following the corners of the blade 22 is prevented. Here, the felt layer 251 is used for the contact portion with the photoconductor drum 10, but if the material has a low friction coefficient and does not hinder the rotation of the photoconductor drum 10 even by contact with the photoconductor drum 10, it is felt. Materials other than wood may be used.

  The film member 24 is a polyurethane sheet, and the tip 241 comes into contact with the photosensitive drum 10 held by the holding portion 211 of the cleaning frame 21, so that the film member 24 is attached from the opposite side of the blade 22. Kimono leakage is prevented.

  FIG. 3 is a view showing the blade support plate in a state where the blade is supported.

  FIG. 3 shows a blade support plate 23 in a state where the blade 22 is supported before being screwed to the cleaning frame 21 of the cleaning device 2. Here, the blade support plate 23 is screwed to the cleaning frame 21. In this state, the surface facing the cleaning frame 21 is shown facing upward. 3 shows a state in which a hole 23a through which the retaining screw 230 shown in FIG. 2 passes and a hole 23b through which the boss 2101 of the cleaning frame body 21 passes are provided.

  FIG. 4 is a view showing the cleaning frame.

  FIG. 4 shows the cleaning frame body 21 in a state before the blade support plate 23, the felt member 25, and the film member 24 are attached to the main body 210, and here, a recessed space for accommodating deposits. The state in which the entrance 210a of is exposed is shown. In FIG. 4, reference numerals A to D are attached to the respective peripheral portions forming the peripheral edge of the inlet 210 a of the recessed space. This is provided for the convenience of the following description. Yes, the cleaning frame 21 is not actually attached. In addition, the peripheral edge portion A, the peripheral edge portion B, and the peripheral edge portion C exist on the same surface, while the peripheral edge portion D exists on a surface that intersects the surface.

  Here, a method of assembling the cleaning device 2 will be briefly described with reference to FIGS.

  FIG. 5 is a diagram showing the flow of the assembly method of the cleaning device.

  In FIG. 5, as step S <b> 1, a sealing material 20 that is applied in a liquid state and has elasticity even when cured and changes its shape by an external force to close a gap between members is shown in FIG. 4. It is applied to the peripheral portion A, the peripheral portion B, and the peripheral portion C that form the peripheral edge of the opening 210a.

  Next, as step S <b> 2, the blade support plate 23 that supports the blade 22 is screwed and fixed to the cleaning frame body 21. At this stage, of the peripheral edge of the inlet 210a, the peripheral edge portion A and a part of the peripheral edge portion B and the peripheral edge portion C are covered with the blade support plate 23 that supports the blade 22, and the inlet 210a is The state is narrower than the state shown in FIG.

  FIG. 6 is a view showing a narrowed entrance of the cleaning frame. In FIG. 6, the edge of the inlet 210 a that is not covered with the member is indicated by a one-dotted line, and the sealing material 20 applied to the peripheral portion is covered with the member. The portion of the sealing material 20 that is not present is indicated by a dotted line.

  FIG. 6 shows the seal member 20 applied to the peripheral portion A, the peripheral portion B, and the peripheral portion C that constitute the peripheral edge of the inlet 210a, in addition to the inlet 210a covered with the blade 22 and the like. The part of the sealing material 20 covered by the blade support plate 23 that supports the blade 22 is crushed and expanded by fixing the blade support plate 23 that supports the blade 22 to the cleaning frame 21. Has been. Returning to FIG.

  Next, the felt member 25 is affixed on the felt sticking surface 2103 (refer FIG. 4) as step S3. Furthermore, the film member 24 is affixed on the peripheral part D as step S4. Here, the lower part of the film member 24 is affixed to the peripheral part D with a double-sided tape (not shown). Furthermore, as step S5, the photosensitive drum 10 is assembled to the holding portion 211 of the cleaning frame 21.

  FIG. 7 is a diagram illustrating a state where the photosensitive drum is assembled to the holding portion of the cleaning frame. In FIG. 7, the illustration of the film member 24 is omitted to avoid complication.

  FIG. 7 shows a state in which the peripheral portion B is viewed in the direction of the arrow X in FIG. 6. Here, the felt member 25 is attached to the felt attaching surface 2103 by the double-sided tape 26. It is shown. As described above, since the elastic layer 252 of the felt member 25 is somewhat compressed when the photosensitive drum 10 is assembled to the holding portion 211 of the cleaning frame 21, the felt layer 251 is in close contact with the photosensitive drum 10. At this time, the sealing material 20 applied to the peripheral portion B is also compressed between the double-sided tape 26 and the peripheral portion B. FIG. 7 shows a state in which the convex portion 250 of the felt member 25 described in FIG. 2 protrudes toward the center of the inlet 210a from the felt sticking surface 2103.

  FIG. 8 is a cross-sectional view of the cleaning device in which the photosensitive drum is assembled.

  FIG. 8 shows a state in which the cross section indicated by the alternate long and short dash line in FIG. 7 is viewed in the direction of the arrow Y, and the tip 241 of the film member 24 attached to the peripheral portion D by the double-sided tape 26 is felt. A state of being caught on the member 25 side is shown.

  Further, FIG. 8 shows a state in which the sealing material 20 indicated by diagonal lines closes the gap between the cleaning frame body 21 and a member fixed to or attached to the cleaning frame body 21 without a gap. ing.

  The above is a rough flow of the assembly method of the cleaning device 2.

  By the way, the application of the sealing material 20 that is applied in a liquid state and has elasticity even when cured and changes its shape by an external force to the peripheral portions A, B, and C shown in FIG. The nozzle portion 300 for controlling the start and stop of discharge of the sealing material 20 from the nozzle tip 301, the cleaning frame body holding base for holding the cleaning frame body 21 in a predetermined posture, and the sealing material 20 being supplied to the nozzle portion 300 A seal material supply unit, an instruction unit that instructs the nozzle unit 300 to open or close the on-off valve, and a movement that holds the nozzle unit 300 and moves the nozzle unit 300 according to the input three-dimensional coordinate value Automatic sealant application system with arm, 3D coordinate position of home position of nozzle tip 301, application start point for each peripheral part, home position of application end point The relative three-dimensional coordinate position against, and the relative three-dimensional coordinate positions between points is considered to be carried out using those registered.

  FIG. 9 is a diagram showing a comparative example of a sealing material application method.

  FIG. 9 shows the movement locus of the nozzle tip 301 that applies the sealing material 20 to the cleaning frame 21.

  FIG. 9 also shows a simplified cleaning frame body 21 and a nozzle portion 300 that discharges from a nozzle tip 301 a sealing material 20 composed of a thermoplastic elastomer that is an example of a liquid material that is applied and cured in liquid form. It is shown. 9, the illustration of the inlet 210a shown in FIG. 4 is omitted. In FIG. 9, the surface including the peripheral edge portion A, the peripheral edge portion B, and the peripheral edge portion C among the peripheral edges of the inlet 210 a of the cleaning frame body 21 is a surface parallel to the XY plane in the XY coordinates shown in FIG. 9. Proceed as if there is.

  First, as shown in FIG. 9A, the peripheral portion B of the peripheral edge of the inlet 210a shown in FIG. 4 extends from the first start point S1 to the first end point D1, that is, with the Y axis shown in FIG. The sealing material 20 is applied while moving the tip of the nozzle 301 in parallel.

  After the application of the sealing material 20 to the peripheral portion B is finished, as shown in FIG. 9B, the nozzle 301 moves in the Z-axis direction on the plane parallel to the YZ plane, and the first end point D1 Move to 1 waypoint V1.

  Next, as shown in FIG. 9C, the nozzle tip 301 moves from the first via point V1 on the plane parallel to the YZ plane in the Y-axis direction, passes through the second via point V2, , It moves in the X-axis direction on a plane parallel to the XY plane and moves to the third via point V3.

  Next, as shown in FIG. 9 (d), after the nozzle tip 301 moves from the third via point V3 to the second start point S2 in the Z-axis direction on a plane parallel to the YZ plane, The sealing material 20 is applied to the peripheral portion C from the second start point S2 to the second end point D2, that is, while moving the tip of the nozzle tip 301 in the Y-axis direction shown in FIG.

  Next, as shown in FIG. 9 (e), the nozzle tip 301 moves from the second end point D2 on the plane parallel to the YZ plane in the Z-axis direction, passes through the fourth via point V4, and passes through the XY point. On the plane parallel to the plane in the X-axis direction, via the fifth via point V5, on the plane parallel to the YZ plane in the Y-axis direction, via the sixth via point V6, After moving on the parallel plane in the Z-axis direction to reach the third start point S3, the sealant is applied to the peripheral portion A while moving on the plane parallel to the XY plane in the X-axis direction and moving to the third end point D3. 20 is applied.

  By the way, during the movement of the nozzle unit 300 while discharging the sealing material 20 from the nozzle tip 301, there is a case where an air blow that interrupts the discharge of the sealing material 20 due to the air entering the inside of the nozzle unit 300 may occur. . In such a case, it is necessary to replenish the seal material 20 later to the place where it is considered that the blank shot has occurred, but it is difficult to accurately identify the spot where blank shot has occurred in such a system. . However, if the sealing material 20 cannot be applied to the empty spot, there is a risk that the contained deposits will flow out from there.

  Therefore, in the cleaning device 2 that is an embodiment of the cleaning device of the present invention, the application of the sealing material 20 to the peripheral portion A, the peripheral portion B, and the peripheral portion C that constitute the peripheral edge of the inlet 210a is described below. Have been devised.

  FIG. 10 is a conceptual diagram of an embodiment of the liquid material application method of the present invention.

  FIG. 10 shows a state in which the point-a-point sealing materials 20 having a diameter a are continuously applied to the application surface so as to be adjacent to each other. This is because the discharge time is measured in advance so that the discharged sealing material 20 has a dot shape with a diameter a, and the sealing material 20 is discharged for this discharge time each time the nozzle position is moved by the distance a. Made.

  In addition, the nozzle unit 300 shown in FIG. 10 detects general vibrations including vibrations that occur at the moment when air is trapped in the nozzle unit 300 and the trapped air is discharged from the nozzle tip 301 instead of the sealing material 20. A vibration sensor 40 is attached. The vibration sensor 40 is connected to a vibration waveform analysis unit provided in the automatic sealing material application system, and a signal detected by the vibration sensor 40 is transmitted to the vibration waveform analysis unit. The vibration waveform analysis unit stores in advance data representing the distribution (reference distribution) of frequency components of signals detected when the sealing material 20 is normally ejected. The vibration sensor 40 analyzes the distribution of the frequency component of the signal transmitted from the vibration sensor 40 and compares it with this reference distribution. The reception time of the signal is recorded in the memory.

  In the sealing material application method of the present embodiment, a predetermined amount of the sealing material 20 is continuously applied in the form of dots while moving the nozzle tip 301 by the same distance as the diameter of the dotted sealing material 20, and the mechanism will be described later. Even if an idle shot occurs in the middle, the position of the tip of the nozzle remains at the location where the empty shot has occurred, and the spot-like sealing material 20 is reapplied.

  Moreover, in the sealing material application method of the present embodiment, among the locations on the peripheral portions B and C where the shape of the clearance with the facing member is more complex than the peripheral portion A, the location corresponding to the location where the clearance is large. Thus, by repeating the application of the dot-like seal material 20 without moving the nozzle position, the dot-like seal materials 20 are stacked, and the application amount of the seal material 20 at that location is increased. Thereby, the sealability of the location is ensured.

  FIG. 11 is a cross-sectional view of the peripheral portion where the dot-shaped sealing material is applied. In addition, since the sealing material application | coating method of this embodiment is similarly performed with respect to each of the peripheral portions A, B, and C shown in FIG. Take up and explain.

  Each point-like sealing material 20 shown in FIG. 11 is numbered, and the point-like sealing materials 20 from number 1 to number 15 in order from the right side in FIG. It is applied step by step. Further, FIG. 11 shows a state in which the dot-like seal material of number 17 is stacked on the dot-like seal material of number 16 to form two steps. Similarly, the dot-shaped sealing materials with numbers 18 and 19 are applied in two stages, and the dot-shaped sealing materials with numbers 20, 21, and 22 are numbered on the dot-shaped sealing materials with number 20. It is shown that 21 point-like sealing materials are stacked, and further, the number 22 point-like sealing materials are stacked on top of the number 21 point-like sealing materials and are arranged in three stages. . These locations where the same location is applied in two or three steps are locations corresponding to locations where the seal material 20 is difficult to spread due to the large gap between the opposing members or the complexity of the gap shape. . The cleaning device 2 that is assembled by applying the sealing material 20 by the sealing material application method of the present embodiment is a common embodiment of the sealing structure of the present invention and the cleaning device of the present invention. The cleaning frame 21 corresponds to an example of the first member according to the present invention, and the combination of the blade 22 and the blade support plate 23 corresponds to an example of the second member according to the present invention.

  FIG. 12 is a flowchart of a program executed when this sealing material application method is carried out.

  In step S1 shown in FIG. 12, the counter that counts the number of application steps is reset. In step S2, the movement of the nozzle tip 301 to the first starting point is instructed. In step S <b> 3, the nozzle unit 300 is instructed to start discharging the sealing material 20. In step S4, after waiting for the elapse of a preset time lapse T necessary for the sealing material 20 discharged at the first starting point to become a point having a diameter a, in step S5, The nozzle unit 300 is instructed to stop discharging the sealing material 20. In step S6, it is confirmed by looking at the time recorded in the above-mentioned memory whether or not vibration due to blank shot was observed during the previous time lapse T, and if vibration due to blank shot is observed. If it is determined, the process returns to step S3, and the dot-like sealing material is applied again. On the other hand, if it is determined that no vibration due to idling is observed, the process proceeds to step S7, and the count value is incremented by one. In step S8, it is determined whether or not the count value of the counter has reached the set number of steps at that location. If it is determined in step S8 that the specified number of stages has not yet been reached, the process returns to step S3. On the other hand, if it is determined that the number of stages has been reached, the process proceeds to step S9 and the counter is reset to zero. In step S10, it is determined whether or not the nozzle tip 301 has reached the end point corresponding to the first start point. If it is determined that the nozzle tip 301 has not yet reached, the process proceeds to step S11 and is the same as the diameter a of the dotted seal material 20. The nozzle position is moved by the distance a. Then, it returns to step S3. On the other hand, if it is determined in step S10 that the nozzle tip 301 has reached the end point, the process advances to step S12 to instruct the nozzle tip 301 to move from the end point to the next start point. Then, it returns to step S3. By the program control as described above, in the automatic sealing material application system, the dot-shaped sealing material 20 corresponding to idle driving is applied to the cleaning frame 21.

  In the above-described embodiment, the example in which the present invention is applied to the cleaning apparatus has been described. However, the present invention is not limited to this as long as the apparatus seals the gap between the members by sandwiching the liquid material. Not limited to applicable.

  In the embodiment described above, an example in which the liquid material discharge side is moved relative to the application surface has been described. However, in the present invention, the application surface may be moved relative to the liquid material discharge side. Good.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Cleaning apparatus 21 Cleaning frame body 22 Blade 23 Blade support plate 300 Nozzle part 301 Nozzle tip 40 Vibration sensor

Claims (3)

Using a nozzle that discharges the liquid material from the tip of the liquid material that is applied in a liquid state at a location on the coating line determined on the member and has elasticity even when cured, and changes its shape by an external force A point application process to apply in a point form;
From where the liquid material in said point-shaped coating process is applied in dots and adjacent the coating line to relevant section, the portion of the liquid material is uncoated, the coating portion changing process for changing the coating portion A liquid material application method that is performed alternately ,
The distribution of the frequency component of the vibration of the nozzle is more than a predetermined level as compared with the distribution of the frequency component of the vibration of the nozzle when the liquid material is normally discharged from the tip of the nozzle. by determining whether different, have a failure detection process punctiform coating in the dot-like coating process to detect whether or not failed,
Said point-like coating process, the liquid material application method comprising processes der Rukoto redoing the dotted coating when failure is detected in said failure detection step.   2. The liquid material coating method according to claim 1, further comprising a step of applying a liquid material on the liquid material that has already been applied onto the coating line. The member sandwiches the applied liquid material between another member and seals the gap between the member with the liquid material, and the gap between the member and the other member. The spacing is uneven,
It is characterized by having a recoating process in which the liquid material is further applied in a dot-like manner on the liquid material that has already been applied at a place where the gap is wider than other places among the places on the coating line. The liquid material coating method according to claim 1 or 2.

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