JP2020036449A - Harness fixture, and harness fixing structure using the same - Google Patents

Abstract

To prevent a harness from being broken by coming into contact with an edge of an opening by being pulled or pushed.SOLUTION: A harness 11 is fixed to a harness fixture 30. The harness fixture 30 includes a cylindrical bush portion 31 into which the harness 11 is inserted, and a plate-like bracket portion 32 protruding from an outer surface in a radial direction of the bush portion 31. A groove portion 32c and a groove portion 32d that are engaged with an end edge portion of an opening 20c are formed on an end surface on a projecting side of the bracket portion 32.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a harness fixing device and a harness fixing structure using the harness fixing device.

    2. Description of the Related Art Conventionally, there is known an image forming apparatus in which power is supplied from an external device (for example, an image scanner or the like) external to the main device of the image forming apparatus.

  A harness for supplying power to an external device is connected to the external device after being exposed to the outside from the back or the like through an opening formed in the main body electric device (for example, see Patent Document 1).

JP 2005-032954 A

  However, in the technique disclosed in Patent Document 1, when the worker pulls the harness to the outside, the harness may be damaged by contacting the edge of the opening by pulling or pushing the harness.

  The present invention has been made in view of such a point, and an object of the present invention is to prevent a harness from being brought into contact with an edge of an opening and damaged by pulling and pushing the harness.

  A harness fixing device according to the present invention is for fixing a harness to an opening formed in a plate-like wall.

  The bushing includes a cylindrical bush portion into which the harness is inserted, and a plate-shaped bracket portion protruding from a radially outer surface of the bush portion. A groove is formed to engage with the edge.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that a harness contacts the edge of an opening and is damaged by pulling and pushing in of a harness.

FIG. 1 is a perspective view of the image forming apparatus according to the embodiment as viewed obliquely from the front right side. FIG. 2 is a schematic diagram showing a connection structure between a main body device and an automatic document feeder by a harness. FIG. 3 is a schematic view showing a harness fixing structure using a harness fixing device. FIG. 4 is a plan view showing the harness fixture viewed from the harness insertion direction. FIG. 5 is a diagram corresponding to FIG. 4 showing a state in which the engagement lock of the harness fixing device is released. FIG. 6 is a view taken in the direction of arrow VI in FIG. FIGS. 7A to 7D are explanatory diagrams for explaining a method of fixing the harness to the harness fixing device. FIG. 8 is an explanatory diagram for explaining a procedure for attaching the harness fixing device to the opening of the housing. FIG. 9 is a diagram showing a state in which the harness fixture is attached to the opening of the housing. FIG. 10 is a diagram corresponding to FIG. 4 showing the second embodiment. FIG. 11 is a diagram corresponding to FIG. 8 showing the second embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the following embodiments.

<< Embodiment 1 >>
FIG. 1 shows an image forming apparatus 1 according to the first embodiment. The image forming apparatus 1 is a composite image forming apparatus (multifunction machine) having a scanner function, a facsimile function, and a copy function in addition to a printing function. In the following description, the front side and the rear side mean the front side and the rear side of the image forming apparatus 1, and the left side and the right side mean the left side and the right side when the image forming apparatus 1 is viewed from the front side. I do.

  The image forming apparatus 1 includes an image forming apparatus main body 2 and an image reading device 3 disposed above the image forming apparatus main body 2. The image forming apparatus main body 2 has a printing unit 4 arranged at an intermediate portion in the vertical direction, and a plurality of paper feed cassettes 5 arranged below the printing unit 4. Each sheet cassette 5 stores sheets of different sizes. The printing unit 4 performs printing on paper supplied from the paper supply cassette 5 based on predetermined image data. The printing method in the printing unit 4 is an electrophotographic method. That is, the printing unit 4 forms an electrostatic latent image by irradiating the surface of the photosensitive drum with laser light corresponding to image data, develops the electrostatic latent image with toner, and transfers the electrostatic latent image to paper.

  The image reading device 3 optically reads an image of a document placed on a contact glass on an upper surface thereof. The upper surface of the image reading device 3 is openably and closably covered by a document pressing cover 6 for pressing a document. The document holding cover 6 is integrated with the automatic document feeder 7. The automatic document feeder 7 conveys the document set on the document feed tray along a predetermined conveyance path, passes the image reading position set on the contact glass, and discharges the document to the document discharge tray. I do. An operation panel 8 protrudes from the front surface of the image reading device 3. The operation panel 8 includes an operation unit 9 including numeric keys and a start key, and a display unit 10 including a liquid crystal display.

  As shown in FIG. 2, the image forming apparatus main body 2 and the automatic document feeder 7 are electrically connected via a harness 11. The harness 11 is connected to a power supply board 12 in the image forming apparatus main body 2 to supply power to the automatic document feeder 7. The harness 11 extends rearward from the power supply board 12, penetrates a rear side wall 20 a (an example of an outer wall of the device) of the image forming apparatus main body 2, extends upward, and is connected to the automatic document feeder 7.

[Schematic of harness fixing structure]
FIG. 3 schematically shows a structure for fixing the harness 11 to the rear wall 20a. The rear wall 20a is formed of, for example, a metal plate-like wall. An opening 20c through which the harness 11 penetrates is formed in the rear wall 20a. The opening 20c is formed in a U-shaped hole that opens to the left as viewed from the thickness direction of the rear side wall 20a. The harness 11 is fixed to an edge of the opening 20c via a harness fixture 30.

  The self-fusing tape 14 is interposed between the harness fixture 30 and the harness 11. The self-bonding tape 14 is a tape made of butyl rubber, and which exerts a sticking force at an overlapping portion between the tapes by being wound while being pulled. The harness 11 is firmly fixed by the frictional force between the self-fusing tape 14 and the inner surface of the harness fixture 30.

  A binding band 13 is wound around the front side (inside of the device) of the harness fixture 30 in the harness 11. The maximum diameter (diameter of the radially outer end) of the binding band 13 is larger than the inner diameter of the bush portion 31 of the harness fixing device 30.

[Configuration of harness fixture]
As shown in FIG. 4, the harness fixture 30 has a substantially cylindrical bush portion 31 into which the harness 11 is inserted, and a plate-like bracket portion 32 protruding from a radially outer surface of the bush portion 31. I have.

  The bush portion 31 has a portion in the circumferential direction formed as a broken portion 31b, and has a substantially C shape when viewed from the axial direction. The inner surface of the bush portion 31 forms an insertion hole 31a through which the harness 11 is inserted. A portion of the bush portion 31 opposed to the broken portion 31b across the axial center position is a flexible portion 31c. As shown in FIG. 5, the bush portion 31 is configured to be able to flex radially outward with a flexible portion 31c (predetermined portion) as a fulcrum.

  The bracket portion 32 includes a one-side bracket portion 32a located on one side in the circumferential direction with the flexible portion 31c as a boundary, and another side bracket portion 32b located on the other side.

  Engagement hooks 32e and engagement grooves 32f that removably engage with each other (portions radially outwardly adjacent) corresponding to the break portions 31b of the one-side bracket portion 32a and the other-side bracket portion 32b, respectively. Is provided. The engaging hook 32e has a trapezoidal plate shape with a thin tip, and the engaging groove 32f has a trapezoidal groove shape engaging with the engaging hook 32e. The engaging hook 32e corresponds to the engaging portion, and the engaging groove 32f corresponds to the engaged portion. Note that the engagement groove 32f may be formed in the other bracket portion 32b, and the engagement hook 32e may be formed in the one bracket portion 32a.

  As shown in FIG. 4, by engaging the engagement hook 32 e with the engagement groove 32 f, the bush portion 31 is locked so as not to be opened, and the harness 11 can be fixed to the harness fixture 30. On the other hand, as shown in FIG. 5, by releasing the engagement between the engagement hook 32e and the engagement groove 32f, the bush portion 31 is opened, and the harness 11 can be attached to and detached from the harness fixture 30.

  As shown in FIG. 6, a groove portion 32c and a groove portion 32d having a U-shaped cross section are formed on radially outer end surfaces (projection side end surfaces) of the one-side bracket portion 32a and the other-side bracket portion 32b, respectively. The groove 32c and the groove 32d are formed so as to fit into the upper edge and the lower edge of the opening 20c, respectively.

[Harness fixing procedure]
Next, a procedure for fixing the harness 11 to the harness fixture 30 will be described with reference to FIG. First, the self-fusing tape 14 is wound around a predetermined portion of the harness 11 several times and fixed (see FIGS. 7A and 7B).

  Next, the bush portion 31 is opened with the flexible portion 31c as a fulcrum, and the portion of the harness 11 around which the self-fusing tape 14 is wound is set on the inner surface of the insertion hole 31a (see FIG. 7C). Thereafter, the engagement groove 32f of the one-side bracket portion 32a and the engagement hook 32e of the other-side bracket portion 32b are engaged to lock the insertion hole 31a so that it cannot be opened (see FIG. 7D). As a result, the harness 11 is immovably restrained (contacted) by the inner peripheral surface of the insertion hole 31 a via the self-fusing tape 14, and the operation of fixing the harness 11 to the harness fixture 30 is completed.

  Then, the harness fixture 30 fixed to the harness 11 is attached to the opening 20c formed in the rear side wall 20a of the image forming apparatus main body 2 as shown in FIG. In this attachment, the harness fixture 30 is inserted from the open side of the opening 20c (the right side of FIG. 8 and the left side of the image forming apparatus 1). At this time, the groove 32c of the one bracket 32a and the groove 32d of the other bracket 32b are inserted into and engaged with the upper edge and the lower edge of the opening 20c, respectively. Then, as shown in FIG. 9, the entire work of attaching the harness fixing device 30 is completed by fitting the entire harness fixing device 30 into the opening 20c. Reference numeral 20b in FIGS. 8 and 9 indicates a left side wall of the image forming apparatus main body 2.

[Effects]
As described above, by using the harness fixture 30 of the present embodiment, it is possible to prevent the harness 11 from directly contacting the edge of the opening 20c. Therefore, when the harness 11 is pulled or pushed, the harness 11 does not come into contact with the edge of the opening 20c and is not damaged. In addition, the edge of the opening 20c is not exposed to the outside and the appearance is not impaired.

  Further, by engaging and disengaging the engagement hook 32e and the engagement groove 32f of the harness fixing device 30, the bush portion 31 can be easily switched between the open state and the locked state.

  The inner diameter of the bush portion 31 is larger than the outer diameter of the harness 11, and the self-fusing tape 14 is wound around the outer peripheral surface of the harness 11. It is in contact with the outer peripheral surface. According to this, it is possible to prevent the movement of the harness 11 in the axial direction by utilizing the frictional force between the self-fusing tape 14 and the inner peripheral surface of the bush portion 31 (the inner peripheral surface of the insertion hole 31a).

  The opening 20c to which the harness fixing device 30 is attached is a cutout hole that opens to one side (the right side in FIG. 8) when viewed from the plate thickness direction. And inserted into the notch hole from the one side so as to be engaged with the edge portion.

  According to this configuration, the harness fixture 30 can be easily attached to the opening 20c by a simple operation.

  Further, a binding band 13 is wound around the harness 11 on the inner side of the harness fixture 30 with respect to the apparatus. The radially outer end of the binding band 13 is located outside the inner peripheral surface of the bush portion 31. Therefore, when the harness 11 moves in the axial direction, the binding band 13 abuts on the axial end face of the bush portion 31 to prevent the movement of the harness 11. Therefore, it is possible to prevent the harness 11 from moving in the axial direction and causing slack.

<< Embodiment 2 >>
10 and 11 show a second embodiment. This embodiment differs from the first embodiment in that positioning of the harness fixture 30 in the insertion direction with respect to the opening 20c is possible. In the following description, the same components as those in FIGS. 4 and 9 are denoted by the same reference numerals, and detailed description thereof will be omitted.

  As shown in FIG. 10, three (a plurality of examples) positioning recesses 32g are formed in the groove 32c of the bracket 32a on one side of the harness fixture 30. The three positioning recesses 32g are arranged at equal intervals along the direction in which the groove 32c extends (that is, the direction in which the harness fixture 30 is inserted).

  As shown in FIG. 11, a positioning projection 20d is formed on the inner side surface (upper edge in the present embodiment) of the opening 20c. The positioning protrusion 20d is formed, for example, in a semicircular shape, and is configured to be able to engage with each positioning recess 32g of the harness fixing device 30. The positioning projection 20d corresponds to a positioning engagement portion, and the positioning recess 32g corresponds to an engaged portion. In addition, you may make it comprise a positioning engagement part with a recessed part and a to-be-engaged part with a convex part.

[Effects]
According to the configuration of the present embodiment, when the harness fixing device 30 is inserted into the opening 20c, one of the three positioning concave portions 32g of the harness fixing device 30 is selectively engaged with the positioning convex portion 20d. Thus, the position of the harness fixture 30 can be adjusted.

  Thereby, the position adjustment of the harness fixture 30 is facilitated, and thus the harness 11 can be fixed at an appropriate position that does not buffer other components.

<< Other embodiments >>
In each of the above-described embodiments, the example in which the harness fixing tool 30 is attached to the rear side wall 20a of the image forming apparatus main body 2 has been described. However, the present invention is not limited to this. The fixture 30 may be attached.

  As described above, the present invention is useful for a harness fixing device and a harness fixing structure using the harness fixing device.

2: Image forming apparatus main body (equipment)
11: harness 12: power supply board 13: binding band 14: self-fusing tape 20a: rear side wall (plate-like wall)
20c: Opening 20d: Positioning convex part (engaged part)
30: Harness fixing device 31: Bush portion 31b: Break portion 31c: Flexible portion (predetermined portion)
32: bracket portion 32f: engagement groove (engaged portion)
32g: Positioning recess (positioning engagement part)

Claims (6)

A harness fixture for fixing a harness to an opening formed in a plate-like wall,
A cylindrical bush portion into which the harness is inserted,
A plate-shaped bracket portion protruding from a radially outer surface of the bush portion,
A harness fixture, wherein a groove is formed on an end surface of the bracket on a protruding side to engage with an edge of the opening. The harness fixture according to claim 1,
The bush portion has a broken portion in a part in the circumferential direction, and is configured to be flexible around a predetermined point different from the broken portion as a fulcrum,
The bracket portion includes a one-side bracket portion located on one side in the circumferential direction and a second-side bracket portion located on the other side of the predetermined location,
A harness fixing tool, wherein a portion adjacent to the break portion of the one-side bracket portion and the other-side bracket portion is provided with an engaging portion and an engaged portion which are detachably engaged with each other. A harness fixing structure using the harness fixing device according to claim 1 or 2,
The inner diameter of the bush portion is larger than the outer diameter of the harness,
A self-sealing tape is wound on the outer peripheral surface of the harness,
A harness fixing structure, wherein an inner peripheral surface of the bush portion is in contact with an outer peripheral surface of the self-fusing tape. A harness fixing structure using the harness fixing device according to claim 1 or 2,
The opening is a cutout hole that opens to one side when viewed from the thickness direction of the plate-like wall,
The harness fixing structure, wherein the harness fixing tool is inserted and attached to the notch hole from the one side so that the groove engages with an edge of the notch hole. A harness fixing structure using the harness fixing device according to claim 1 or 2,
The plate-like wall is an outer wall of the device,
A binding band is wound around the harness fixing device inside the device in the harness,
The harness fixing structure, wherein the binding band is configured to abut on an axial end surface of the bush portion to prevent the movement of the harness when the harness moves in the axial direction. The harness fixing structure according to claim 4,
On the inner surface of the opening, a positioning engagement portion formed of a projection or a recess is formed,
A plurality of engaged portions engageable with the positioning engagement portion are formed in the groove portion of the harness fixture at intervals from each other along an insertion direction of the harness fixture; Fixed structure.

Images