JP2007258068A - Terminal mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal mounting structure capable of securing easy demounting of a terminal when it is recycled. <P>SOLUTION: The terminal mounting structure is such that the terminal 10 is mounted on a resin-made member 20 by inserting a protrusion 22 formed integrally on the resin-made member 20 through an opening 11 formed in the terminal 10 composed of a conductive plate member. The protrusion 22 is formed so as to rise from a recess 23, as its root, recessed from a terminal mounting surface 21 on which the terminal 10 is mounted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a terminal mounting structure, and more particularly to a terminal mounting structure for mounting a terminal made of a plate-like member to a resin member.

  Image forming apparatuses such as copiers, printers, and facsimiles form a latent image by selectively exposing the surface of a uniformly charged photosensitive drum according to image information, and forming the electrostatic latent image The toner image is developed to form a toner image, and the toner image is transferred to a recording sheet. After image recording, the unfixed toner image is fixed to the recording sheet.

  In order to perform high-quality transfer, it is necessary to appropriately apply a high-voltage transfer bias to the transfer roller. A terminal for applying a transfer bias to the transfer roller is formed of a conductive metal thin plate member, and is attached to, for example, a resin member that houses a drive transmission system of the transfer roller and is fixed inside the apparatus main body. Such a terminal is conventionally attached using a terminal attachment structure as shown in FIG. In the terminal mounting structure, the terminal 91 is mounted on the resin member 93 by being press-fitted into and inserted through the projection 94 of the resin member 93 into the opening 92 of the terminal 91. Since the tongue piece 95 positioned opposite to both sides of the opening 92 abuts against the protrusion 94, and the protrusion 94 is locked and retained by the urging force of the tongue piece 95 as a leaf spring. Under the circumstances, the terminal 91 is not removed.

The terminal 91 can be removed from the resin member 93 by unlocking the tongue piece 95 using a tool having a flat tip such as a driver. However, such removal work is cumbersome and time-consuming. Therefore, when the metal terminals 91 are separated for recycling, the operator usually uses a finger or the like to detect the vicinity of the tip of the protrusion 94. After pressing from the side and breaking the protrusion 94 to break, the terminal 91 was removed. Note that Patent Document 1 discloses that a sheet metal member is attached to a resin member by press-fitting a chrysanthemum hole of the sheet metal member into a protruding portion protruding from the resin member.
JP 2002-286004 A

  However, the protrusion 94 is integrally formed on the resin member 93 so as to rise with the terminal mounting surface 96 on which the terminal 91 is mounted as a root, and the resin member 93 is formed by molding. Since the root of the protrusion 94 has a corner radius, the protrusion 94 may break while remaining in the vicinity of the root as shown by the broken line L in FIG. When the protrusion 94 is broken in this manner, the remaining root and the opening 92 of the terminal 91 interfere with each other, and it becomes difficult to remove the terminal 91 from the resin member 93. Therefore, when recycling the terminal 91, There was a problem that it took time.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a terminal mounting structure capable of ensuring easy removal of terminals when recycling.

  In order to achieve the above object, the terminal mounting structure according to claim 1 inserts a protrusion formed integrally with a resin member into an opening formed in a terminal made of a conductive plate member. Thus, in the terminal mounting structure for attaching the terminal to the resin member, the protrusion is formed so as to stand up with a recessed portion recessed from a surface on which the terminal is placed as a root. Yes.

  The terminal mounting structure according to claim 2 is characterized in that, in the terminal mounting structure according to claim 1, the terminal includes a leaf spring piece for locking the protruding portion inserted through the opening.

  The terminal mounting structure according to claim 3 is the terminal mounting structure according to claim 1 or 2, wherein a plurality of the openings are formed in the terminal, and the protrusions correspond to the openings, respectively. It is characterized by being formed in plural.

  According to the terminal mounting structure of the first aspect of the present invention, when the terminal is attached to the resin member, the protrusion formed integrally with the resin member is inserted into the opening formed in the terminal. The projecting portion is formed so as to stand up with a recessed portion that is recessed from a surface on which the terminal is placed (hereinafter referred to as a terminal placing surface) as a root. Therefore, when pressing the vicinity of the tip of the protruding portion protruding beyond the opening and breaking the protruding portion, the protruding portion may be formed so as not to remain beyond the terminal placement surface after breaking. It becomes possible. Therefore, when performing the recycling, it is possible to ensure that the terminal is easily removed from the resin member by breaking and breaking the protrusion. Moreover, the said terminal attachment structure can be implemented only by changing the type | mold used when a resin-made member is shape-processed from the said conventional terminal attachment structure. Therefore, the attachment workability can be maintained at the same level as before without increasing the cost or changing the design of other components.

  According to the terminal mounting structure of the second aspect, the terminal includes the leaf spring piece that locks the protruding portion inserted through the opening. For this reason, the protruding portion is prevented from coming off from the opening by the urging force of the leaf spring piece, and the easy removal of the terminal from the resin member can be surely prevented.

  According to the terminal mounting structure of the third aspect, a plurality of openings are formed in the terminal, and a plurality of protrusions are formed in the resin member so as to respectively correspond to the openings. Therefore, it is possible to more reliably attach the terminal to the resin member.

  A terminal mounting structure according to an embodiment of the present invention includes, for example, a copying machine, a printer, a facsimile, and an image forming apparatus including a multifunction machine having at least two of these functions. This is applied to a structure in which a terminal for applying a bias voltage of 1 is attached. In the image forming apparatus, although not shown, the recording sheet conveyed to the photosensitive drum is pressed against the photosensitive drum by a transfer roller disposed so as to be in contact with the outer peripheral surface of the photosensitive drum across the sheet conveying path. A bias voltage having a polarity opposite to that of the toner on the photosensitive drum is applied to the transfer roller, and the toner image on the photosensitive drum is transferred to the recording paper. The recording sheet on which the toner image is transferred is sent to the fixing unit by the rotation of the photosensitive drum and the transfer roller.

  Such a transfer roller is composed of a shaft made of metal such as stainless steel and a roller portion made of conductive elastic material such as EPDM foam attached around the shaft, and generates a predetermined bias voltage at a high voltage. Applied from the source to the shaft through the terminal. For example, the transfer roller presses the photosensitive drum with a predetermined pressing force by a manufacturing force of a metal spring disposed at the end of the shaft, and the spring and the terminal are pressed by a predetermined conductive member. A bias voltage is applied to the transfer roller from the terminal through the spring and the conductive member.

  The shaft of the transfer roller is rotationally driven by a driving force from a driving source such as a motor via a drive transmission system including a gear and the like, and rotates following the rotation of the photosensitive drum. The drive transmission system is accommodated in a resin member and disposed at a predetermined position, and a terminal for applying a bias voltage to the transfer roller is attached to the resin member.

  Hereinafter, a terminal mounting structure for mounting a terminal for applying a bias voltage to a transfer roller to a resin member will be described with reference to the drawings. As shown in FIG. 1, this terminal mounting structure is a structure for mounting the terminal 10 to the resin member 20, and can ensure that the terminal 10 is easily detached from the resin member 20 when recycling is performed. It is.

  The terminal 10 is, for example, a conductive flat plate member (sheet metal member) formed by processing a stainless steel thin plate material having a plate thickness of 0.2 mm to 0.3 mm. The terminal 10 is provided with a plurality of openings 11. The terminal 10 before being mounted is formed so that two parallel cuts extend from both ends of the opposite sides of the rectangular opening 11 as shown in a partially enlarged view in FIG. Thus, a set of rectangular tongues 12 are provided so as to sandwich the opening 11 therebetween. The tongue piece 12 is a thin leaf spring piece that resists bending deformation by an urging force.

  The resin member 20 is formed by molding a non-conductive resin used as an engineering plastic such as polycarbonate resin or ABS resin, and accommodates a drive transmission system (not shown) of the transfer roller and the like. It is fixed at a predetermined position inside the apparatus. As shown in FIG. 1, a flat terminal placement surface 21 is formed on the resin member 20 along a part of its inner wall surface. The terminal 10 is placed on the terminal placement surface 21 in contact with the bottom surface thereof. A substantially cylindrical projection (boss) 22 is formed at a position corresponding to the opening 11 of the terminal 10 placed on the terminal placement surface 21. As shown in FIGS. 2A and 3, a recess 23 that is recessed from the terminal placement surface 21 is formed around the protrusion 22. The recessed portion 23 is recessed and lowered from the terminal placement surface 21 by about 0.3 mm to 1 mm, for example, 0.5 mm, and is formed to be stepped down with respect to the terminal placement surface 21. The protrusion 22 has a root at the recess 23 and is integrally formed so as to rise from the central portion of the recess 23 and rise. In other words, an annular groove is formed around the base of the protrusion 22, and the outer peripheral surface of the protrusion 22 and the inner peripheral surface of the groove form the same surface.

  The terminal 10 and the resin member 20 are prevented from being detached and fixed by simply press-fitting (fitting) the protrusion 22 into the opening 11. As shown in FIG. 2A, the terminal 10 in the state before the attachment has an opening 11, that is, the gap between the tongue pieces 12 is narrower than the diameter of the protrusion 22 of the resin member 20. When the tongue piece 12 is pressed against the protruding portion 22 in order to attach the terminal 10 to the resin member 20, the tongue piece 12 is pressed against the elastic restoring force of the tongue piece 12 as shown in FIG. It bends and deforms to incline in the opposite direction. By further pressing against the urging force of the tongue piece 12, the protrusion 22 is inserted into the opening 11, and the protrusion 22 is press-fitted into the opening 11 until the bottom surface of the terminal 10 abuts on the terminal placement surface 21. The terminal 10 is attached to the resin member 20. In this attached state, as shown in FIGS. 2B and 3, the tip of the tongue 12 abuts against the side surface of the protrusion 22, and the urging force of the tongue 12 as a leaf spring is the protrusion 22. Since the tongue piece 12 and the protruding portion 22 are engaged with each other to prevent separation, the terminal 10 is fixedly attached to the resin member 20.

  Here, the protrusion 22 formed integrally with the resin member 20 has a strength that allows the tongue 12 to be bent by being press-fitted into the opening 11 of the terminal 10. Due to the bending stress generated by the pressing force that the operator presses the vicinity of the tip side to the side with a finger, it has a strength that can be easily broken and broken near the base. Since there is a minute corner radius at the base of the protrusion 22, the weakest portion with respect to the bending moment based on the pressing force is basically a cross section located at the corner radius end, but considering errors due to various uncertain factors. However, the concave portion 23 having an appropriate depth is formed so as not to break on the upper side beyond the terminal mounting surface 21. Therefore, if the operator presses the vicinity of the tip, the protruding portion 22 is broken and broken at the breaking line L shown in FIG. Since the protruding portion 22 remaining after the breakage does not exist above the terminal mounting surface 21, the remaining protruding portion 22 does not get in the way when the terminal 10 is removed from the resin member 20. 10 can be easily detached from the resin member 20. In addition, by creating a dedicated tool in which holes corresponding to the protrusions 22 are respectively formed, inserting the protrusions 22 in the holes and moving the dedicated tool to the side, the protrusions 22 are collectively broken. You can fold it.

  Furthermore, by constructing the protruding portion 22 so as to protrude from the upper surface of the terminal 10 as in the conventional case, the workability of attaching the terminal 10 to the resin member 20 can be performed as well as in the conventional case, and in terms of space. In addition, since this embodiment is equivalent to the conventional one, the present embodiment can be applied as it is without any design change of other components.

  The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, although the terminal 10 is provided with the tongue piece 12 on the periphery of the opening 11 and the projection 22 is locked by the biasing force of the tongue piece 12, the opening in which the tongue piece 12 does not exist on the periphery of the opening 11 is shown. 11 may be provided. In this case, the mounting position of the terminal 10 on the resin member 20 can be aligned by inserting the projection 22 through the opening 11. Furthermore, in this case, any locking means for locking the terminal 10 to the resin member 20 may be provided. Moreover, although the example in case the terminal 10 is flat was shown, the case where the terminal 10 is not flat, such as what has a level | step difference by bending etc., may be sufficient.

  Further, although an example of the terminal 10 for applying a bias voltage to the transfer roller is shown, a bias is applied to a charging roller that charges the surface of the photosensitive drum, a developing roller (developing sleeve) that supplies developer to the photosensitive drum, and the like. It may be a terminal for applying a voltage. Moreover, although expressed as the terminal 10, if it is used in order to electrically connect a predetermined member from a power supply, the name will not be limited, for example, what is called a power feeding plate or a contact plate There may be.

It is a fragmentary perspective view which shows the terminal attachment structure which concerns on embodiment of this invention. It is a fragmentary perspective view at the time of seeing the part enclosed with the dashed-two dotted line of FIG. 1 from the arrow direction of FIG. 1, (a) shows the state before attaching the terminal 10, (b) attached the terminal 10. Shown later. It is a fragmentary sectional view which shows the part enclosed with the dashed-two dotted line of FIG. It is a fragmentary sectional view which shows the conventional terminal mounting structure.

Explanation of symbols

10 Terminal 11 Opening 12 Tongue piece (leaf spring piece)
20 Resin member 21 Terminal mounting surface 22 Protrusion 23 Recess

Claims (3)

A terminal mounting structure for attaching the terminal to the resin member by inserting a protrusion formed integrally with the resin member into an opening formed in a terminal made of a conductive plate member,
The terminal mounting structure, wherein the protrusion is formed so as to rise with a recessed portion recessed from a surface on which the terminal is placed as a root.   The terminal mounting structure according to claim 1, wherein the terminal includes a leaf spring piece that locks the protruding portion inserted through the opening.   The terminal attachment structure according to claim 1, wherein a plurality of the openings are formed in the terminal, and a plurality of the protrusions are formed in the resin member so as to correspond to the openings, respectively.

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