JP4909235B2 - High voltage contact terminal block - Google Patents

Description

  The present invention relates to a high-voltage contact terminal block that holds a high-voltage contact that electrically connects various process units of an image forming apparatus and a high-voltage substrate having a high-voltage power source that supplies a high voltage thereto.

  Various image processing units that require high voltage, such as image carrier units, charging units, developing units, transfer units, cleaning units, and fixing units, in image forming apparatuses such as printers and copiers that form images by electrophotography However, the high-voltage substrate provided with a high-voltage power supply for supplying a high voltage to these process units and the various process units are arranged at positions separated from each other.

  Therefore, a plurality of high-voltage contacts held on the high-voltage contact terminal block and each terminal of the high-voltage board are connected, and for example, a round terminal attached to an end of an electric wire extending from various process units is connected to each high-voltage contact. Is used to electrically connect the various process units and the high voltage substrate (for example, see Patent Document 1).

Various proposals have also been made for detachable contact terminal blocks that are not limited to image forming apparatuses (see, for example, Patent Documents 2 and 3).
Japanese Patent Laid-Open No. 2007-071999 JP 2002-164094 A JP-A-9-147933

  In a high-voltage contact terminal block conventionally used in an image forming apparatus, a leaf spring that can hold a predetermined contact pressure by elastically contacting each terminal of a high-voltage substrate is connected to the high-voltage contact held by the terminal block. Is used, and the terminal and leaf springs attached to the ends of the wires extending from the various process units are fastened with fastening parts such as screws, so it is troublesome to attach and remove the terminals to and from the leaf springs. In a color image forming apparatus provided with many high-voltage contacts, there is a problem that a lot of time is spent on the work and work efficiency is poor.

  The present invention has been made in view of the above problems, and its object is to easily and efficiently attach and detach a round terminal attached to an end of an electric wire extending from various process units to a high-voltage contact with one touch. The object is to provide a high-voltage contact terminal block capable of

  In order to achieve the above object, the invention described in claim 1 is a high-voltage contact terminal block that holds a high-voltage contact that electrically connects various process units of the image forming apparatus and a high-voltage substrate that supplies a high voltage to them. The high-voltage contact is composed of a spring contact and a terminal guide with which the end of the spring contact engages, and a tapered cylindrical protrusion whose upper surface forms an inclined surface projects from the terminal guide, one end of which is the process unit When a round terminal attached to the other end of the electric wire connected to is inserted from the horizontal direction along the terminal guide, the round terminal fits into the protrusion while pushing up the end of the spring contact along the slope of the protrusion. It is characterized by having comprised so that it may match.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the terminal block body made of resin is formed in a duct shape, and a fan is provided in the terminal block body.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a substrate mounting guide is provided on a resin terminal base body.

  According to the first aspect of the present invention, when the round terminal attached to the end of the electric wire is inserted from the horizontal direction along the terminal guide of the high-voltage contact terminal block, the round terminal protrudes from the terminal guide. The end of the spring contact is pushed up along the slope, and it is connected to the spring contact by fitting it into the protrusion, and the round terminal is pressed against the terminal guide by the spring force of the spring contact, so that it is surely prevented from coming off. . In addition, by tilting the round terminal obliquely, the round contact rises while pushing up the spring contact against the spring force, and the engagement with the protrusion of the terminal guide is released, so that the round contact can be easily removed. . Therefore, the round terminals attached to the ends of the electric wires extending from the various process units can be easily and efficiently detached and attached to the spring contacts with a single touch, and the high voltage substrate and the various process units are electrically connected to each other. A high voltage can be supplied from the substrate to various process units.

  According to the second aspect of the present invention, since the resin terminal block main body is formed in a duct shape and the fan is provided in the terminal block main body, the cooling air induced by the fan passes through the duct portion so that the high voltage contact point. The portion is effectively cooled, and heat generation in the portion is suppressed.

  According to the third aspect of the present invention, since the board mounting guide is provided on the resin terminal block body, the high voltage board can be easily mounted on the terminal block body without using a fastener such as a screw.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a perspective view of a high-voltage contact terminal block according to the present invention, FIG. 2 is a cutaway perspective view of a high-voltage contact portion of the high-voltage contact terminal block, and FIG. 3 is a partial perspective view showing a configuration of a terminal guide of the high-voltage contact terminal block. 4 is a perspective view of a spring contact, FIG. 5 is a perspective view of a round terminal, FIG. 6 is a partial perspective view of a high-voltage contact terminal block showing how to attach and detach the round terminal, and FIG. 7 is a high-voltage contact showing an insertion locus of the round terminal. FIG. 8 is a perspective view of a high-voltage contact terminal block and a high-voltage board mounted on the terminal block, FIGS. 9 and 10 are perspective views showing how to attach the high-voltage board to the high-voltage contact board, and FIG. FIG. 12 is a partial perspective view showing a holding structure of another high-voltage board to the high-voltage contact board, and FIG.

  As shown in FIG. 1, the high-voltage contact terminal block 1 according to the present invention has a terminal block body 1A integrally formed in a duct shape with insulating resin, and a rectangular duct 2 is formed on the terminal block body 1A. The fan 3 is provided on one side thereof.

  In addition, a terminal box 4 divided into five is formed on the upper part of the terminal block main body 1A. Each terminal box 4 is provided with a spring contact 5 as a high-voltage contact mounted on a spring receiver 6 respectively. Yes. Here, as shown in detail in FIG. 3, each spring receiver 6 is formed into a tapered cylindrical shape upward and is formed integrally with the terminal guide 7. As shown in FIG. 3, the contact guide 7 is provided with a substantially horizontal flat portion 7a and a wall-shaped guide rib 7b erected vertically on the back side of the flat portion 7a. At the center, a tapered columnar protrusion 7c is formed integrally as a projecting surface with a slope whose upper surface becomes higher toward the back side (guide rib 7b side).

  As shown in FIG. 4, the spring contact 5 is constituted by a coil spring made of a conductive metal, and a terminal (not shown) of the high voltage substrate 8 shown in FIG. 5 is electrically connected. And the lower end of each spring contact 5 is extended horizontally, and the arc-shaped contact 5a is formed in the edge part, As shown in FIG.2 and FIG.6, this contact 5a is the terminal guide 7 of FIG. The flat portion 7a is brought into contact with the projection 7c so as to surround the periphery thereof, whereby the spring contact 5 and the terminal guide 7 are electrically connected.

  Incidentally, as shown in FIG. 1, a window-like rectangular window-like opening 9 is formed at a location corresponding to each terminal box 4 on the upper side wall of the terminal block body 1A of the high-voltage contact terminal block 1. Further, as shown in FIG. 9, two upper and lower substrate rails 10 as substrate mounting guides are formed horizontally along the longitudinal direction at the bottom of the back surface of the terminal block main body 1A.

  Thus, the high-voltage board 11 shown in FIG. 9 has its side edge fitted into the board rail 10 formed on the back surface of the high-voltage contact terminal block 1, and is slid in the direction of the arrow in FIG. As shown in FIG. 10, the high voltage contact terminal block 1 is mounted on the terminal block body 1A.

  Further, as shown in FIG. 11, a substrate holding member 12 is provided at a side end of the high-voltage contact terminal block 1, and another high-voltage substrate 13 disposed on the side of the high-voltage contact terminal block 1 is shown in FIG. As shown in FIG. 1, one end of the substrate holding member 12 is attached to the high-voltage contact terminal block 1 by being held by the substrate holding member 12.

  By the way, although not shown, an image forming apparatus such as a printer or a copying machine that forms an image by an electrophotographic method has high voltages such as an image carrier unit, a charging unit, a developing unit, a transfer unit, a cleaning unit, and a fixing unit. Various necessary process units are provided, but the high-voltage substrate (see FIG. 8) provided with a high-voltage power source for supplying high voltage to these process units and the various process units are arranged at separate positions. Has been.

  Accordingly, a plurality (five in the present embodiment) of contact springs 5 held on the high-voltage contact terminal block 1 are connected to the terminals of the high-voltage substrate 8 and the wires 14 extending from various process units are connected to the contact springs 5. There is a system in which various process units and the high-voltage board 8 are electrically connected by connecting a round terminal 15 (see FIGS. 2, 5, and 6) attached to an end of (see FIGS. 8 to 12). It has been adopted.

  Here, as shown in detail in FIG. 5, the round terminal 15 is formed with a ring-shaped contact 15 a at the tip, and the inner diameter of the contact 15 a is that of the protrusion 7 c protruding from the terminal guide 7. It is set slightly larger than the outer diameter. Further, a cylindrical terminal 15b is provided at the base end portion of the round terminal 15, and an electric wire 14 (see FIGS. 8 to 12) extending from various process units is connected to the terminal 15b.

  Thus, when the round terminal 15 is attached, the ring-shaped contact 15a is first inserted into each terminal box 4 from the opening 9 opening the round terminal 15 into the terminal base body 1A of the high-voltage contact terminal block 1. 6 is inserted in the direction of arrow a. Then, when the tip of the round terminal 15 is inserted into the terminal box 4 to a certain length, the whole round terminal 15 is horizontally turned in the direction of arrow b in FIG. Push in the direction.

  Then, while the contact 15a at the tip of the round terminal 15 is guided by the guide rib 7b of the terminal guide 7, the insertion locus is drawn by the arrow shown in FIG. 7 along the slope of the protrusion 7c protruding from the terminal guide 7. The circular contact 15 is connected to the spring contact 5 as shown in FIGS. 2 and 6 by pushing up the arc-shaped contact 5 a of the spring contact 5 and being fitted to the protrusion 7 c, and the round terminal 15 is connected to the terminal guide 7 by the spring force of the spring contact 5. Since it is pressed against the flat portion 7a, it is reliably prevented from coming off.

  From the state in which the round contact 15 is fitted to the protrusion 7c of the terminal guide 7 and connected to the spring contact 5 as described above, the base end side of the round contact 15 is lowered downward with the protrusion 7c as the center (arrow d in FIG. 2). When the circular contact 15 is tilted obliquely by pushing it down, the round contact 15 rises while pushing up the contact 5a of the spring contact 5 against its spring force, and the terminal guide 7 of the contact 5a of the round terminal 15 rises. Since the fitting with the projection 7c is released, the round contact 15 can be easily removed.

  Therefore, according to the present embodiment, the round terminal 15 attached to the end of the electric wire 14 extending from the various process units can be easily and efficiently attached to and detached from the spring contact 5 with one touch. Various process units can be electrically connected to supply high voltage from the high voltage substrate 8 to the various process units.

  In this embodiment, since the resin terminal block main body 1A is formed into a duct shape and the fan 3 is provided on the terminal block main body 1A, the cooling air induced by the fan 3 passes through the rectangular duct 2. As a result, the joint between the spring contact 5 and the round terminal 15 is effectively cooled, and the heat generation at that portion is suppressed.

  Furthermore, in the present embodiment, since the substrate rail 10 as the substrate mounting guide is provided on the resin terminal block main body 1A, the high voltage substrate 11 can be easily mounted on the terminal block main body 1A without using a fastener such as a screw. be able to.

It is a perspective view of the high voltage contact terminal block concerning the present invention. It is a fracture perspective view of a high voltage contact portion of a high voltage contact terminal block according to the present invention. It is a fragmentary perspective view which shows the structure of the terminal guide of the high voltage | pressure contact terminal block which concerns on this invention. It is a perspective view of a spring contact. It is a perspective view of a round terminal. It is a fragmentary perspective view of the high voltage | pressure contact terminal block which shows the attachment / detachment point of a round terminal. It is a fragmentary sectional view of the high voltage contact terminal block which shows the insertion locus of a round terminal. 1 is a perspective view of a high-voltage contact terminal block according to the present invention and a high-voltage board attached thereto. It is a perspective view which shows the attachment point to the high voltage | pressure contact board of a high voltage board | substrate. It is a perspective view which shows the attachment point to the high voltage | pressure contact board of a high voltage board | substrate. It is a perspective view which shows the holding structure of the other high voltage board | substrate to the high voltage contact terminal block which concerns on this invention. It is a fragmentary perspective view which shows the holding structure of the other high voltage board | substrate to a high voltage contact terminal block.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High voltage contact terminal block 1A Terminal block main body 2 Rectangular duct 3 Fan 4 Terminal box 5 Spring contact 5a Spring contact terminal 6 Spring receiver 7 Terminal guide 7a Terminal guide flat part 7b Terminal guide guide rib 7c Terminal guide protrusion 8 High voltage board 9 Terminal body opening 10 Board rail (Board mounting guide)
DESCRIPTION OF SYMBOLS 11 High voltage board 12 Board holding member 13 High voltage board 14 Electric wire 15 Round terminal 15a Contact of round terminal 15b Terminal of round terminal

Claims (3)

In a high-voltage contact terminal block that holds a high-voltage contact that electrically connects various process units of the image forming apparatus and a high-voltage substrate having a high-voltage power source that supplies a high voltage thereto,
The high-voltage contact is composed of a spring contact and a terminal guide with which the end of the spring contact engages, and a tapered cylindrical protrusion whose upper surface forms an inclined surface projects from the terminal guide, one end of which is the process. When a round terminal attached to the other end of the electric wire connected to the unit is inserted from the horizontal direction along the terminal guide, the round terminal pushes up the end of the spring contact along the slope of the projection to the projection. A high-voltage contact terminal block characterized by being configured to fit.   2. The high-voltage contact terminal block according to claim 1, wherein a resin-made terminal block body is formed in a duct shape, and a fan is provided on the terminal block body.   3. The high-voltage contact terminal block according to claim 1, wherein a substrate mounting guide is provided on the resin terminal block main body.

Images