JP2014059049A - Coupling method for door structure, door structure, and image forming apparatus - Google Patents

Abstract

Kind Code: A1 A door structure coupling method, a door structure, and an image forming apparatus capable of effectively preventing an incomplete opening / closing operation and a closing state of a door without causing twist or distortion in the entire door structure. provide.
A burring portion that protrudes toward the side opposite to the pilot hole is formed on the pilot hole opposite portion of the metal reinforcing plate. A metal reinforcing plate is overlaid on the resin door body. Screw the self-tapping screw into the prepared hole in the resin door body through the burring part. As a result, the edge of the burring portion on the side opposite to the pilot hole bites into the head seating surface of the self-tapping screw.
[Selection] Figure 1

Description

  The present invention relates to a door structure coupling method, a door structure, and an image forming apparatus.

In an electrophotographic image forming apparatus such as a copying machine, a printer, a facsimile machine, or a multifunction machine equipped with these, the copying machine itself can be easily moved into the copying machine for jamming by a user or for repair by a service person. A door structure is attached so as to be accessible.

  A door structure of this type of image forming apparatus is generally provided with a resin door body provided with a pilot hole and a metal reinforcing plate coupled to the resin door body.

  Conventionally, the resin door body and the metal reinforcing plate are combined as shown in FIGS. 19 to 22. In FIG. 19, the resin door body 1 is provided with a pilot hole 2 and a metal reinforcing plate 3 is superimposed on the resin door body 1, and a B-tight type or TP type self-tapping screw 4 is attached to the resin door body 1. And screwed into the pilot hole 2. The pilot hole 2 is formed in a boss portion 5 provided in the resin door body 1.

  However, in the method of FIG. 19, screw slip may occur in the direction of arrow A due to external force or vibration applied to the door structure. In that case, the door structure as a whole is twisted or distorted, causing problems such as incomplete opening / closing operation and closing of the door.

  In order not to cause such a problem, the head 4a of the self-tapping screw 4 is fixed with a screw lock agent 6 as shown in FIG. 20, or a washer such as a spring washer or a star washer as shown in FIG. 7 was used.

  However, the methods shown in FIG. 20 and FIG. 21 are not preferable in terms of production because they are insufficient in terms of strength against screw slip and slack, and the number of assembling steps increases and costs increase.

  Therefore, conventionally, as shown in FIG. 22, a burring portion 8 projecting to the side opposite to the pilot hole is formed at the pilot hole opposing portion of the metal reinforcement plate 3, and the metal reinforcement plate 3 is attached to the resin door body 1. It has been proposed that the self-tapping screw 4 is screwed in the prepared hole 2 of the resin door main body 1 through the burring portion 8 in a superposed state (Patent Document 1).

  That is, the head seating surface 9 of the self-tapping screw 4 is brought into contact with the burring portion 8 to thereby prevent screw slip.

  As a processing method for the burring portion 8, it is common to punch out a pilot hole and then take a clearance in accordance with the plate thickness and perform a rising process. For this reason, the end face 8a of the burring portion 8 in the manufacturing process is likely to vary. That is, if there are a plurality of burring portions 8 to be formed, it is difficult to uniformly set the height of the end surfaces and the flatness (surface accuracy) of the end surfaces in all the burring portions 8.

  As described above, due to variations in the end surface 8a of the burring portion 8, the height of the end surface of the burring portion 8 and the flatness (surface accuracy) of the end surface are different, and the screw fastening torque may vary for each burring place. is there. That is, there is a concern about fastening work efficiency stability. Further, since the fastening is performed with a high torque, the screw head and the screw thread may be damaged.

  Therefore, the entire door structure is not twisted or distorted, and it is possible to effectively prevent the door from opening and closing and from being incompletely closed, and it is stable in terms of strength against screw sliding and loosening. Provided are a door structure coupling method, a door structure, and an image forming apparatus capable of preventing an increase in assembly man-hours and contributing to cost reduction.

  The door structure coupling method of the present invention includes a resin door body having a boss portion, and a metal reinforcing plate coupled via a screw member screwed into a hole provided in the boss portion of the resin door body. A door structure provided with an edge projecting to the other side of either the resin door main body side or the metal reinforcing plate side, and the metal reinforcing plate attached to the resin door main body In the overlapped state, the screw member is screwed into a hole provided in the resin door body, and the edge is bitten to the other side.

  With the door structure coupling method of the present invention, fluctuations in screw fastening torque at each coupling location can be reduced, and work efficiency can be stabilized. In addition, the edge of one of the resin door body and the metal reinforcing plate bites into the other side, thereby preventing the occurrence of screw slip due to external force or vibration applied to the door structure. It is possible to suppress the occurrence of twists and distortions that occur throughout. That is, the door structure joined by this door structure joining method is most suitable for a door with a severe opening / closing operation or the like that hardly causes distortion after assembly.

It is an enlarged front view of the coupling | bond part of the door structure which shows a 1st Example. It is an expansion perspective view of the burring part of the coupling | bond part of the door structure shown in the said FIG. FIG. 2 is an overall perspective view of an image forming apparatus using the door structure shown in FIG. 1. It is sectional drawing of the door structure shown in the said FIG. FIG. 10 is an enlarged cross-sectional view showing a first modification of the coupling portion of the door structure. FIG. 6 is an enlarged perspective view of a burring portion of the coupling portion shown in FIG. 5. It is an enlarged front view which shows the 2nd modification of the coupling | bond part of a door structure. FIG. 8 is an enlarged perspective view of a burring portion of the coupling portion shown in FIG. 7. It is a principal part expansion perspective view of the burring part of the coupling | bond part shown in the said FIG. It is an expanded sectional view of the joint part of the door structure which shows a 2nd example. It is an enlarged front view of the burring part of the coupling | bond part shown in the said FIG. It is a perspective view which shows the boss | hub part of the coupling | bond part shown in the said FIG. It is an expanded sectional view of the joint part of the door structure which shows a 3rd example. It is a perspective view of the insert member used for the coupling | bond part shown in the said FIG. It is a perspective view which shows the boss | hub part of the state by which the insert member shown in the said FIG. 15 was equipped internally. It is an expanded sectional view of the joint part of the door structure which shows a 4th example. FIG. 18 is a perspective view of an insert member used for the coupling portion shown in FIG. 17. It is a perspective view which shows the boss | hub part of the state by which the insert member shown in the said FIG. 18 was equipped internally. It is sectional drawing of the coupling | bond part of the conventional door structure. It is sectional drawing of the coupling | bond part of the other conventional door structure. It is sectional drawing of the coupling | bond part of another conventional door structure. It is sectional drawing of the coupling | bond part of another conventional door structure.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention according to embodiments shown in the drawings will be described.

  FIG. 3 is an overall perspective view of a copying machine that is an image forming apparatus. The image forming apparatus includes an image reading unit, an image processing unit, an image forming unit, and the like. In addition, the image forming apparatus main body 51 in which the image reading unit, the image processing unit, the image forming unit, and the like are accommodated can be easily moved into the image forming apparatus main body 51 for handling jamming by a user or repair by a service person. Doors 52 and 53 which are door structures are provided so as to be accessible. Since the door 52 and the door 53 have the same configuration, only one door 52 will be described.

  As shown in FIG. 4, one door 52 which is a door structure includes a resin door main body 55 and a metal reinforcing plate (sheet metal member) coupled to the resin door main body 55 via a self-tapping screw 56. 57.

  The resin door main body 55 includes a flat plate-like substrate portion 58, a plurality of boss portions 59 protruding from the inner surface of the substrate portion 58, and a peripheral wall portion 60 provided at the peripheral edge of the substrate portion 58. A pilot hole 61 is provided in each boss portion 59.

  The metal reinforcing plate 57 is superimposed on the resin door main body 55, and in this state, the self-tapping screw 56, which is a screw member, is inserted into the prepared hole 61 which is a hole provided in the boss portion 59 of the resin door main body 55. Is screwed. At this time, the metal reinforcing plate 57 is formed with a burring portion 62 at a portion facing the boss portion 59 of the resin door main body 55, and the self-tapping screw 56 is screwed into the prepared hole 61 through the burring portion 62. It is.

  In this case, as shown in FIGS. 1 and 2, the burring portion 62 has concave and convex teeth 63 on the end surface opposite to the pilot hole. That is, the concave and convex teeth 63 are formed by alternately forming inverted triangular concave teeth 64 and triangular convex teeth 65 along the circumferential direction. In addition, the triangular convex tooth 65 has a dimension between both side surfaces that gradually decreases from the pilot hole side to the counter pilot hole side when viewed from the front, and the apex portion, that is, the edge E, extends in a line in the radial direction.

  One side of the door 52 is pivotally connected to the resin door main body 55 through a hinge mechanism H so as to be swingable. The door 52 covers the opening of the image forming apparatus main body 51 in the closed state and opens in the open state. Is released. For this reason, as shown in FIG. 4, support metal fittings 70 are provided at two locations on the upper and lower sides of the door 52, and the support metal fittings 70 are provided with hinge pin fitting holes 70 a. A hinge pin (not shown) is provided on the image forming apparatus main body 51 side, and the hinge pin is fitted in the hinge pin fitting hole 70a. Therefore, the hinge mechanism H is configured by the hinge pin fitting hole 70a and the hinge pin. That is, the door 52 swings around the hinge pin. The support fitting 70 is attached to the door 52 with a screw member 69.

  Next, a method for connecting the door structures will be described. First, a burring portion 62 that protrudes to the side opposite to the pilot hole is formed at the pilot hole opposing portion of the metal reinforcing plate 57. In this case, it can be formed by a publicly known burring machine or the like. If the burring part 62 is formed with an existing burring machine, a short cylinder is formed.

Accordingly, the concave and convex teeth 63 are formed on the end surface of the short cylinder on the side opposite to the pilot hole.
Four inverted triangular notches (concave teeth) 64 are formed at a predetermined pitch along the circumferential direction, in this case, 90 ° pitch. For this reason, convex teeth 65 are formed between the concave teeth 64 adjacent in the circumferential direction, and four convex teeth 65 are formed, and an edge E extending in the radial direction constituted by the apex 65a of the convex teeth 65 is formed. Four are formed at a pitch of 90 ° along the circumferential direction.

  When the self-tapping screw 56 is screwed, it is preferable that the edge E of the uneven tooth 63 contacts the head seating surface 66 of the self-tapping screw 56 with high precision and uniformity. On the other hand, it is preferable to use a press die having an inverted shape. That is, by forming such a press die by plastic deformation that presses against the end surface of the burring portion 62 on the side opposite to the prepared hole with a press machine, it is possible to form the concavo-convex teeth 63 with high accuracy.

  Thus, the metal reinforcing plate 57 provided with the burring portion 62 having the edge E is overlapped with the resin door main body 55 as shown in FIG. At this time, the burring portion 62 of the metal reinforcing plate 57 is made to correspond to each boss portion 59 of the resin door main body 55. In this state, the self-tapping screw 56 is screwed into the pilot hole 61 through the burring portion 62, and the edge E of the burring portion 62 is caused to bite into the head seat surface 66 of the self-tapping screw 56. As a result, the resin door body 55 and the metal reinforcing plate 57 are integrated.

  According to the door structure joining method of the present invention, even if the height of the end face of the burring portion 62 formed is different, the edge E on the side opposite to the pilot hole of the burring portion 62 is attached to the self-tapping screw 56. Since the head seating surface 66 is bitten, fluctuations in the screw fastening torque can be suppressed for each burring execution place, and work efficiency can be stabilized. In addition, since the edge of the burring portion 62 bites into the head seat surface 66 of the self-tapping screw 56, it is possible to prevent the occurrence of screw slip due to external force or vibration applied to the door structure, which occurs in the entire door structure. Twist and distortion can be suppressed.

  Next, the burring portion 62 shown in FIGS. 5 and 6 expands from the pilot hole side (the boss portion side and the base end side) toward the counter pilot hole side (the anti boss portion side and the distal end side). This is a short cylinder portion 71. For this reason, the inner peripheral edge 71 a of the opening 72 on the side opposite to the pilot hole constitutes a circular edge E that bites into the head seat surface 66 of the self-tapping screw 56. That is, the inner diameter dimension D1 of the opening 72 on the opposite pilot hole side is set larger than the inner diameter dimension D2 of the opening 73 on the pilot hole side of the short cylinder part 71. That is, D1> D2.

  Thus, when the edge E is configured by the inner peripheral edge 71a of the opening 72 on the side opposite to the pilot hole of the short cylindrical portion 71, the head seat surface 66 of the self-tapping screw 56 is bitten into a circular shape, The resistance to the self-tapping screw 56 tightening (rotation) direction can be reduced, and a stable screw tightening torque can be obtained. Further, it is possible to cope with screw slip in all directions.

  Next, the burring part 62 shown in FIGS. 7 to 9 has a diameter increasing from the pilot hole side (the boss part side and the base end side) toward the counter pilot hole side (the anti boss part side and the tip side). The concave and convex teeth 75 are formed on the end surface of the short cylindrical portion 71 opposite to the pilot hole. In this case, the concave teeth 76 of the concave and convex teeth 75 have an inverted triangular shape when viewed from the front, but the convex teeth 77 have a trapezoidal shape when viewed from the front. That is, the tip of the convex tooth 77 is a flat surface 78 that is inclined downward from the inner diameter side toward the outer diameter side.

  For this reason, the edge E is comprised by the front-end | tip part of the convex tooth 77 of the uneven | corrugated tooth 75, ie, the internal diameter edge 78a of the flat surface 78 thru | or its corner parts 78b and 78b.

  In the configuration of the edge E, when the self-tapping screw 56 is tightened, the corner portions 78b and 78b can deeply bite into the head seat surface 66 of the self-tapping screw 56, and the occurrence of screw slip can be prevented more firmly. it can. In addition, the corner portions 78b and 78b serve as resistances and can prevent screw loosening.

  Even in the burring portion 62 shown in FIGS. 7 to 9, when the self-tapping screw 56 is screwed, it is preferable that the edge E contacts the head seat surface 66 of the self-tapping screw 56 with high accuracy and evenness. Therefore, when the uneven tooth 75 is formed, it is preferable to use a press die having a shape inverted with respect to the uneven tooth 75.

  Next, in FIG. 10, the metal reinforcing plate 57 is provided with a burring portion 80 protruding toward the boss portion side. That is, the burring portion 80 includes a short cylindrical portion 81 that increases in diameter from the side opposite to the pilot hole (on the side opposite to the boss, ie, the base end) toward the side of the pilot hole (on the side of the boss, ie, the tip). The concave / convex teeth 85 are formed on the end surface of the short hole on the prepared hole side. In this case, the concave teeth 86 of the concave and convex teeth 85 have an inverted triangular shape when viewed from the front, but the convex teeth 87 have a trapezoidal shape when viewed from the front. That is, the tip of the convex tooth 87 is a flat surface 88 that is inclined upward from the inner diameter side toward the outer diameter side.

  For this reason, as shown in FIG. 11, the edge E is comprised by the front-end | tip part of the convex tooth 87 of the uneven | corrugated tooth 85, ie, the internal diameter edge 88a of the flat surface 88 thru | or the corner parts 88b and 88b.

  Further, as shown in FIGS. 10 and 12, the boss portion 89 on the resin door body 55 side is provided with a fitting recess 90 that opens to the metal reinforcing plate 57 side. 80 is inserted. In this case, the inner diameter dimension of the fitting recess 90 is set sufficiently larger than the maximum outer diameter dimension of the burring portion 80.

  Before the self-tapping screw 56 is screwed into the pilot hole 91, the length (height) from the door main body facing surface (boss portion side facing surface) 57b to the edge E of the metal reinforcing plate 57 is set to the fitting recess. It is set slightly larger than the depth 90 (height from the end surface 89a of the boss portion 89 to the bottom surface 90a of the fitting recess 90).

  Then, if the self-tapping screw 56 is screwed into the pilot hole 91, the head seat surface 66 of the self-tapping screw 56 is placed on the outer peripheral edge portion of the burring portion 80 on the door body opposite surface 57a of the metal reinforcing plate 57. Abut. At this time, the metal reinforcing plate 57 is screwed in until the door body facing surface (boss portion side facing surface) 57 b comes into contact with the end surface 89 a of the boss portion 89. Accordingly, the edge E bites into the bottom surface 90a of the fitting recess 90, and the sliding of the metal reinforcing plate 57 and the resin door main body 55 can be effectively prevented. Further, if the self-tapping screw 56 is screwed in, the door main body facing surface (the boss portion side facing surface) 57b of the metal reinforcing plate 57 and the end surface 89a of the boss portion 89 come into contact with each other. Excessive biting into the bottom surface 90a of the recess 90 can be prevented.

  In the structure shown in FIG. 7 and the like, the edge height H1 protrudes from the metal reinforcing plate 57 to the outside, whereas in the structure shown in FIG. Does not protrude outward. For this reason, downsizing can be achieved. In addition, the edge E bites into the bottom surface 90 a of the fitting recess 90. For this reason, even if the height of the end surface of the burring part 80 to be formed is different, the edge E of the burring part 80 can be bitten into the bottom surface 90a of the fitting recess 90, The fluctuation of the fastening torque can be suppressed, and the working efficiency can be stabilized. Further, by causing the edge E of the burring portion 80 to bite into the bottom surface 90a of the fitting recess 90, it is possible to prevent the occurrence of screw slip due to an external force or vibration applied to the door structure, and a twist or the like generated in the entire door structure. Generation of distortion can be suppressed.

  Next, in FIG. 13, the depth of the fitting recess 90 is made deeper than that shown in FIG. That is, as shown in FIG. 15, the boss 95 in this case has a fitting recess 90 having a large diameter and a small diameter provided on the bottom surface 90a of the fitting recess 90. A bottom hole 96 is formed.

  Then, the insert member 93 is fitted (press-fitted) into the fitting recess 90, and the lower surface (reinforcement plate opposite surface) 93 b is placed on the bottom surface 90 a of the fitting recess 90. As shown in FIG. 14, the insert member 93 is made of a metal disc body having a screw hole 92 at the axial center thereof. Therefore, if the screw member 94 is screwed into the screw hole 92 of the insert member 93 via the burring portion 80, the seating surface 94a of the screw member 94 is burring on the door main body opposite surface 57a of the metal reinforcing plate 57. It contacts the outer peripheral edge of the portion 80. As a result, the edge E at the tip of the burring portion 80 bites into the reinforcing plate facing surface 93 a of the insert member 93. When the screw member 94 is screwed in, as shown in FIG. 13, the tip end portion of the screw member 94 enters the bottom hole 96 and the screwing is not restricted. As shown in FIG. 14, a circumferential groove 93 c is provided on the outer peripheral surface of the insert member 93. As a result, it is possible to improve the press-fit property of the insert member 93 into the fitting recess 90 and the adhesion between the outer peripheral surface of the insert member 93 and the inner peripheral surface of the fitting recess 90.

  In this case, in the initial state, the edge height H <b> 2 is larger than the depth D from the reinforcing plate facing surface 93 a of the insert member 93 to the end surface 95 a of the boss portion 95. For this reason, as shown in FIG. 13, in the state where the edge E at the tip of the burring portion 80 bites into the reinforcing plate facing surface 93 a of the insert member 93, the back surface (boss portion facing surface 57 b) of the metal reinforcing plate 57. And a gap S is formed between the boss portion 95 and the end surface 95a.

  In the case shown in FIG. 13, the edge E bites into the reinforcing plate facing surface 93 a of the insert member 93. For this reason, even if the height of the end surface of the burring portion 80 to be formed is different, the edge E of the burring portion 80 can be bitten into the reinforcing plate facing surface 93a of the insert member 93. Therefore, the same effect as that of the structure shown in FIG. 1 or FIG. 10 is obtained.

  Incidentally, there is a case where the metal reinforcing plate 57 is attached / removed due to repair of the door structure or the like, and the reinforcing plate facing surface 93a of the insert member 93 is sequentially scraped by the edge E by such work. is there. For this reason, as shown in FIG. 10, in the initial stage, with the edge E biting in, the back surface of the metal reinforcing plate 57 (the boss portion side facing surface 57b) is in contact with the end surface 89 of the boss portion 89. If the bottom surface 90a of the fitting recess 90 is scraped off by the edge E by the mounting / removal work of the metal reinforcing plate 57, the edge E may not be able to bite into the bottom surface 90a of the fitting recess 90. There is. If the edge E does not bite into the bottom surface 90a of the fitting recess 90, the above-described effects cannot be achieved.

  On the other hand, if the insert member 93 as shown in FIG. 13 is used, since the insert member 93 is made of metal, it can be effectively prevented from being scraped off by the edge E, and the metal reinforcing plate 57 and the resin are made. It is possible to prevent a reduction in the fixing force with respect to the door main body 55 (the biting force of the edge E). If the reinforcing plate facing surface 93a of the insert member 93 is scraped off by the edge E, the edge E can be bitten into the reinforcing plate facing surface 93a of the insert member 93 by replacing the insert member 93 with a new one.

  Further, in the initial state, a gap S is formed between the back surface (boss portion side facing surface 57 b) of the metal reinforcing plate 57 and the end surface 95 a of the boss portion 95. For this reason, even if the reinforcing plate facing surface 93a of the insert member 93 is scraped off by the edge E, the gap S can absorb the scraped portion, and the edge E is absorbed by the reinforcing plate facing surface 93a of the insert member 93. Can be bitten. That is, it is possible to prevent a reduction in the fixing force (the biting force of the edge E) between the metal reinforcing plate 57 and the resin door main body 55.

  By the way, in each said Example, the edge E was provided in the metal reinforcement board 57 side, and this edge E was made to bite into the other party, ie, the resin door main body 55 side, but as shown in FIG. An edge E may be provided on the door body 55 side, and the edge E may be bitten into the other side, that is, the metal reinforcing plate 57 side. In the example shown in FIG. 16, the burring portion 80 is not formed on the metal reinforcing plate 57. That is, the metal reinforcing plate 57 is only provided with a through hole 100 through which the screw member 99 is inserted in the boss portion corresponding portion. In this case, the boss portion 102 includes a large-diameter fitting recess 103 on the metal reinforcing plate side and a small-diameter hole 104 on the anti-metallic reinforcing plate side. Interior (press-fit). That is, the insert member 105 is press-fitted into the fitting recess 103 with the anti-reinforcement plate facing surface 105 b placed on the bottom surface 103 a of the fitting recess 103.

  In this case, the reinforcing plate facing surface 105a of the insert member 105 and the end surface 102a of the boss portion 102 are arranged on substantially the same plane. That is, the thickness T of the insert member 105 and the depth of the fitting recess 103 (the height from the bottom surface 103a of the fitting recess 103 to the end surface 102a of the boss portion 102) D1 are substantially the same. Here, “substantially identical” refers to the case where the thickness T is slightly larger than the depth D1 of the fitting recess 103, or the thickness T is slightly smaller than the depth D1 of the fitting recess 103 in the same case. Including.

  Further, the insert member 105 is formed of a disc body having a screw hole 106 formed in the axial center portion thereof, and a protruding ring 107 is formed on the reinforcing plate facing surface 105a as shown in FIGS. Yes. The projecting ring 107 has a triangular cross section as shown in FIG. A circumferential groove 105 c is provided on the outer peripheral surface of the insert member 105.

  For this reason, as shown in FIG. 16, the screw member 99 is screwed into the screw hole 106 of the insert member 105 fitted in the fitting recess 103 of the boss portion 102 through the through hole 100 of the metal reinforcing plate 57. If it inserts, the front-end | tip edge part of the projection ring 107 of the insert member 105, ie, the edge E, will bite into the boss | hub part opposing surface 57b of the metal reinforcement board 57. FIG.

  Thus, if the edge E bites into the boss portion facing surface 57b of the metal reinforcing plate 57, the same effects as those of the structure shown in FIGS. 1, 10, and 13 can be obtained. By the way, in order for the edge E to bite into the boss portion facing surface 57b of the metal reinforcing plate 57, the edge E needs to protrude from the end surface 102a of the boss portion 102 to the metal reinforcing plate side. Therefore, when the reinforcing plate facing surface 105a of the insert member 105 and the end surface 102a of the boss portion 102 are disposed on the same plane, the reinforcing plate facing surface 105a of the insert member 105 is more metal than the end surface 102a of the boss portion 102. There is no problem when protruding toward the reinforcing plate side, but when the end surface 102a of the boss portion 102 protrudes closer to the metallic reinforcing plate side than the reinforcing plate facing surface 105a of the insert member 105, the edge E is the metallic reinforcing plate. In some cases, the boss portion facing surface 57 does not cut into the surface. For this reason, in such a case, it is necessary to set the edge height (height of the projection ring 107) in consideration of the protrusion amount of the end surface 102a of the boss portion 102 from the reinforcing plate facing surface 105a of the insert member 105. is there.

  In FIG. 16, the edge E of the insert member 105 fitted to the boss portion 102 bites into the boss portion facing surface of the metal reinforcing plate 57, and the metal reinforcing plate 57 and the resin door main body 55. Can be effectively prevented.

  Moreover, there is an advantage that the thickness dimension of the door can be reduced. That is, when compared with the one shown in FIG. 13 and the one shown in FIG. 16, the dimension from the tip edge 99b of the screw member 99 shown in FIG. 16 to the bottom 104a of the hole 104 shown in FIG. The thickness dimension of the door is reduced by a value obtained by subtracting the protrusion height H4 from the value obtained by adding H3.

  In the door structure in which the metal reinforcing plate 57 is coupled to the resin door main body 55 by the coupling method of the door structures, the entire door structure is not twisted or distorted. It is possible to effectively prevent incomplete closing and provide a high-quality product. For this reason, this door structure is optimal for an image forming apparatus door for handling jamming by a user or repair by a serviceman.

  In addition, this invention is not limited to the above-mentioned Example, Of course, a various change can be added in the range which does not deviate from the summary of this invention. As the self-tapping screw, various types such as B tight type and TP type can be used. Further, the number of teeth of the concavo-convex teeth 63 and 75 in the burring portion 62 shown in FIGS. 1 and 7, that is, the number of the convex teeth 65 and 77 constituting the edge E can be arbitrarily set. However, since it will be received by external force and vibration from multiple directions and the edge E, four or more are preferable. In this case, it is preferable to arrange them at a predetermined constant pitch along the circumferential direction. As shown in FIG. 10, FIG. 13, etc., the number of convex teeth 87 constituting the edge E can be arbitrarily set even in the burring portion 80 that does not protrude to the outside.

  The height dimensions of the burring portions 62 and 80, the taper angle of the edge E, the diameter expansion angle of the short cylinder portions 71 and 81, and the like are determined when the self-tapping screw 56 is screwed into the prepared hole 61 of the resin door body 55. Various changes can be made within a range in which the edge E bites into the other side and screw sliding or the like can be effectively prevented. Various types of resin that are conventionally used in this type of door structure can be adopted as the resin of the resin door main body 55 and the metal of the metal reinforcing plate. The number of boss portions 59, 89, 95.102 provided on the resin door body 55, outer diameter dimensions, inner diameter dimensions, height dimensions, and the like can be arbitrarily set.

  As shown in FIGS. 10 and 13, when the burring portion 80 that does not protrude to the outside is provided, the burring portion may have a shape as shown in FIG. 1 or FIG.

  In the embodiment shown in FIG. 13, the insert member 93 is made of metal, but may be made of resin. In addition, the insert member 93 is fitted into the fitting recess 90 by press-fitting, but a male screw is provided on the outer peripheral surface of the insert member 93 and a female screw is provided on the inner diameter surface of the fitting recess 90 to be screwed together. May be. Further, in the embodiment shown in FIG. 16, the edge E is configured by the protruding ring 107 of the insert member 105. However, instead of the protruding ring 107, the edge E is arranged at a predetermined pitch in the circumferential direction. A plurality of protrusions may be provided on the reinforcing plate facing surface 105a of the insert member 105, and the edge E may be configured by the leading edge of each protrusion. The image forming apparatus according to the present invention includes an electrophotographic copying machine, a laser beam printer, a facsimile machine, and the like.

51 Image forming apparatus main body 55 Resin door main body 56 Self-tapping screw 57 Metal reinforcing plate 59, 89, 95, 102 Boss portion 61 Pilot hole 62, 80 Burring portion 63, 85 Concavity and convexity 64, 86 Concavity 65, 87 Convex Teeth 66 Head seating surfaces 71, 81 Short tube portion 72 Opening portion 75 Concave teeth 76 Concave teeth 77 Convex teeth 78a, 88a Inner edge 78b, 88b Corner portions 94, 99 Screw members 93, 105 Insert member E Edge

Japanese Patent No. 4144226

Claims (14)

A door structure coupling method comprising: a resin door main body having a boss portion; and a metal reinforcing plate coupled via a screw member screwed into a hole provided in the boss portion of the resin door main body. And
Either one of the resin door body side or the metal reinforcement plate side is provided with an edge protruding to the other side, and the screw member is placed on the resin door with the metal reinforcement plate superimposed on the resin door body. A method for joining door structures, wherein the edge is cut into the other side by screwing into a hole provided in the main body.   A burring part protruding to the opposite boss part side is formed on the boss part facing part of the metal reinforcing plate, the edge is provided on the burring part, and the metal reinforcing plate is superimposed on the resin door body. The self-tapping screw which is a screw member is screwed into the pilot hole which is the hole of the resin door body through the burring part, and the edge of the burring part is bitten into the head seating surface of the self-tapping screw. The method for connecting door structures according to claim 1.   The resin door body includes a boss portion having a fitting recess that opens to the metal reinforcing plate side, and a burring that protrudes toward the boss portion side of the metal reinforcing plate and fits into the fitting recess. Forming a portion, providing the edge on the burring portion, and superimposing a metal reinforcing plate on the resin door body, a screw member is inserted into a pilot hole that is a hole portion of the resin door body through the burring portion. 2. The method of connecting door structures according to claim 1, wherein a self-tapping screw is screwed in to cause the edge of the burring portion to bite into the bottom surface of the fitting recess.   The resin door body includes a boss portion having a fitting recess that opens to the metal reinforcing plate side, and a burring that protrudes toward the boss portion side of the metal reinforcing plate and fits into the fitting recess. The burring part is provided with the edge, the fitting member provided in the boss part is provided with an insert member, and a metal reinforcing plate is superimposed on the resin door body. The method for connecting door structures according to claim 1, wherein the screw member is screwed into the screw hole of the insert member through the portion, and the edge of the burring portion is bitten into the insert member in the fitting recess. .   The door structure according to any one of claims 2 to 4, wherein uneven teeth are formed on a front end side end surface of the burring portion, and the edges are configured by the protruded teeth of the uneven teeth. Join method.   The burring portion is a short cylindrical portion whose diameter increases from the proximal end side toward the distal end side, and the edge is configured at the inner peripheral edge of the opening portion on the side opposite to the boss portion of the short cylindrical portion. The door structure according to any one of claims 4 to 5.   The burring portion includes a short cylindrical portion that increases in diameter from the proximal end side toward the distal end side, and the concave and convex teeth are formed on the distal end side end surface of the short cylindrical portion. The method for joining door structures according to any one of claims 2 to 4, wherein the edge is formed in a corner portion.   The resin door body is provided with a boss portion having a fitting recess opening on the metal reinforcing plate side, and an insert member provided with the edge on the reinforcing plate facing surface is provided in the fitting recess provided in the boss portion. Interior, with the metal reinforcing plate overlaid on the resin door body, the screw member is screwed into the screw hole of the insert member through the through hole of the resin door body, and the edge is formed on the resin door body. The door structure body joining method according to claim 1, wherein the door structure body bites into the opposite surface of the boss part. A door structure including a resin door main body having a boss portion and a metal reinforcing plate coupled via a screw member screwed into a hole provided in the boss portion of the resin door main body,
With the metal reinforcement plate superimposed on the resin door body, screw the screw member into the hole provided in the boss of the resin door body, and either the resin door body or the metal reinforcement plate A door structure characterized in that an edge provided on one side is bitten into the other side.   A screw member is inserted into a pilot hole, which is a hole provided in the boss portion of the resin door main body, through a burring portion formed so as to protrude to the boss portion opposite side of the boss portion of the metal reinforcing plate. The door structure according to claim 9, wherein a certain self-tapping screw is screwed and the edge provided on the burring portion is bitten into a head seating surface of the self-tapping screw.   The resin door body includes a boss portion having a fitting recess that opens to the metal reinforcing plate side, and is formed at the boss portion facing portion of the metal reinforcing plate so as to protrude toward the boss portion side. A self-tapping screw, which is a screw member, is screwed into a pilot hole, which is a hole provided in the boss portion of the resin door body, through a burring portion that fits into the recess, and the edge of the burring portion is attached to the bottom surface of the fitting recess. The door structure according to claim 9, wherein the door structure is bitten into the door structure.   The resin door body includes a boss portion having a fitting recess that opens to the metal reinforcing plate side, and is formed so as to protrude toward the boss portion side at a boss portion facing portion of the metal reinforcing plate. The screw member is screwed into the screw hole of the insert member built in the fitting recess through the burring portion fitted into the fitting recess, and the edge of the burring portion is bitten into the insert member built in the fitting recess. The door structure according to claim 9.   The resin door body is provided with a boss portion having a fitting recess that opens to the metal reinforcing plate side, and the fitting recess of the boss portion is internally provided with an insert member provided with an edge on the reinforcing plate facing surface, With the metal reinforcing plate overlaid on the resin door body, the screw member is screwed into the screw hole of the insert member, and the edge of the insert member is bitten into the boss part facing surface of the resin door body. The door structure according to claim 9, wherein   An image forming apparatus in which an openable / closable door structure is attached to an opening of the apparatus main body, wherein the door structure according to any one of claims 9 to 13 is used. Forming equipment.

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