JP7293944B2 - Fixing device and image forming device - Google Patents

Description

The present invention relates to a fixing device and an image forming apparatus for fixing developer transferred onto a medium.

In a conventional fixing device, a connector attached to a holder of a heater unit and a heater power source are electrically connected by wiring, and the heater power source is controlled to heat the fixing belt (for example, , see Patent Document 1).
In addition, to prevent the lead wires of the stepping motor from coming off from the terminals due to an external force, or being damaged or broken due to swinging, the hooks projecting from the bracket with the lead wires bent in the right angle direction are provided. In some cases, the stop portion is secured by using an Insulok band (see, for example, Patent Document 2).

JP 2015-191734 A JP-A-10-288272

However, in the conventional technology, when a movable member to which a wire is connected is provided in the fixing device, there is a problem that the operation of the member places a load on the wire.
SUMMARY OF THE INVENTION It is an object of the present invention to solve such problems, and to reduce the load on wiring connected to a movable member.

For this reason, the present invention provides a supporting portion that rotatably supports a first rotating body, a second rotating body that rotatably supports a wire connected to the supporting portion, and a wiring that is connected to the supporting portion. a rotating member rotatably supported, wherein the rotating member includes a connecting portion to which the wiring is connected, a wiring holding portion for holding the wiring, the connecting portion and the wiring holding portion. and a locking portion that abuts on the wiring connected to the connecting portion, and the rotating member rotates about a rotating fulcrum between the second rotating body and the first and a second position where the second rotating body and the first rotating body are separated from each other, and the wire holding portion is rotatable between is a state in which the rotating member is arranged at the first position, and in the rotating direction of the rotating member, the rotating range of the locking portion of the rotating rotating member; It is characterized in that it is arranged in a region connecting with the rotation fulcrum.

Thus, the present invention has the effect of reducing the load on the wiring connected to the movable member.

FIG. 2 is a schematic side view showing the configuration of the fixing device in the first embodiment; FIG. 1 is a schematic cross-sectional side view showing the configuration of an image forming apparatus according to a first embodiment; Explanatory drawing of the arrangement of the upper unit in the first embodiment A perspective view showing the configuration of the upper unit in the first embodiment. Explanatory drawing of arrangement of cables in the first embodiment Explanatory drawing of the rotation operation of the upper unit in the first embodiment Explanatory drawing of arrangement of cables in modified example Schematic side view showing the configuration of a fixing device in a second embodiment The perspective view which shows the structure of the upper unit in 2nd Example.

Hereinafter, embodiments of a fixing device and an image forming apparatus according to the present invention will be described with reference to the drawings.

FIG. 2 is a schematic side sectional view showing the configuration of the image forming apparatus in the first embodiment.
In FIG. 2, an image forming apparatus 1 has a fixing device and forms and prints an image on a medium, and is, for example, an electrophotographic color printer. In this embodiment, the image forming apparatus 1 is described as a color printer, but it may be a monochrome printer. In this embodiment, a printer that prints a standard-sized medium (pre-cut paper) that has been cut into a predetermined size in advance will be described. may be used as a printer for printing.

The image forming apparatus 1 includes a paper feed cassette 20, a registration roller 33, a developing device 12 (12C, 12M, 12Y, 12K), a transfer device 35, a fixing device 41, a discharge roller 42, and a discharged paper stacking unit. 43.
The paper feed cassette 20 accommodates a stack of media P on which a developer image is formed. By rotating a paper feed roller 32, the media P are separated one by one as indicated by an arrow A in the figure. The paper is fed in the medium transport direction and transported to the registration rollers 33 .

The registration rollers 33 supply the medium P transported from the paper feeding cassette 20 by the paper feeding rollers 32 to the developing device 12 in accordance with the timing of development by the developing device 12 .
The developing device 12 includes a developing device 12C that forms a toner image as a cyan (C) developer image, a developing device 12M that forms a toner image as a magenta (M) developer image, and a yellow (Y) developer image. and a developing device 12K for forming a toner image as a black (K) developer image. Although the developing devices 12C, 12M, 12Y, and 12K use different toners as developers, they have the same configuration, so the developing device 12C will be described as a representative.

The developing device 12C has a photosensitive drum 121C, a charging device 122C, an exposure device 123C, and a developer supply device 124C.
The exposure device 123C forms an electrostatic latent image on the photosensitive drum 121C as an image carrier. The photosensitive drum 121C is rotatably supported by the developing device 12C in the direction indicated by the arrow in the drawing, and the charging device 122C, the exposure device 123C, and the developer supply device 124C are arranged in this order from the upstream in the rotational direction. . The image carrier may be belt-shaped instead of drum-shaped.

The charging device 122C uniformly charges the surface of the photosensitive drum 121C.
The exposure device 123C selectively exposes the surface of the photosensitive drum 121C charged by the charging device 122C to light using a light source such as an LED (Light Emitting Diode) to form an electrostatic latent image on the surface of the photosensitive drum 121C. be.

The developer supply device 124C accommodates toner therein and supplies the toner to the electrostatic latent image formed on the surface of the photosensitive drum 121C by the exposure device 123C to develop the toner image.
A cleaning device for removing toner such as transfer residual toner remaining on the surface of the photosensitive drum 121C is disposed downstream of the developer supply device 124C in the rotational direction of the photosensitive drum 121C.

The transfer device 35 has rollers 36a and 36b, a transfer belt 36, and transfer rollers 37C, 37M, 37Y and 37K.
The transfer belt 36 is stretched around two rollers 36a and 36b, and is endless and rotatable in the medium conveying direction indicated by the arrow A in the drawing.

The transfer rollers 37C, 37M, 37Y and 37K are arranged to face the photosensitive drums 121C, 121M, 121Y and 121K of the developing devices 12C, 12M, 12Y and 12K with the transfer belt 36 interposed therebetween.
The transfer device 35 is arranged to face the developing devices 12C, 12M, 12Y, and 12K. The rotating transfer belt 36 conveys the medium P, and the transfer rollers 37C, 37M, 37Y, and 37K to which a predetermined transfer voltage is applied transfer the medium P. , developing devices 12C, 12M, 12Y, and 12K.

At least one of the rollers 36a and 36b is rotatable by a driving source such as a motor.
The fixing device 41 has a fixing belt 41a and a driving roller 41b arranged opposite to the fixing belt 41a, and nips and conveys the medium P conveyed from the transfer device 35, and transfers the toner transferred onto the medium P. The image is fixed by heat and pressure.

The fixing belt 41a is made of a SUS base material or the like, has a heating element such as a heater as a heat source inside, and is controlled by a control unit so as to reach a predetermined fixing temperature. The fixing belt 41a is arranged so as to be pressed against the drive roller 41b, and rotates following the rotation of the drive roller 41b.

The drive roller 41b is rotated by driving a motor or the like. The drive roller 41b rotates in the direction indicated by the arrow in the drawing to convey the medium P to the discharge roller 42. As shown in FIG.
The discharge roller 42 conveys the medium P on which the toner image is fixed by the fixing device 41 to the outside of the apparatus and discharges it.

The ejected paper stacking unit 43 stacks the media P ejected by the ejection rollers 42 .
FIG. 1 is a schematic side view showing the configuration of the fixing device in the first embodiment, and is a view of the mounting surface of the drive gear and sensor of the fixing device.

In FIG. 1 , the fixing device 41 has an upper unit 410 , a lower unit 411 and a cable 412 .

The lower unit 411 as a support section is attached to the main body of the image forming apparatus 1 shown in FIG. 2, and rotatably supports the driving roller 41b as the first rotating body shown in FIG. , and a rotation fulcrum 413 to rotatably support the upper unit 410 . In addition, FIG.1(b) represents the state which the upper unit 410 shown to Fig.1 (a) rotated in the direction which arrow B shows in a figure.

An upper unit 410 as a rotating member rotatably supports a fixing belt 41a as a second rotating body shown in FIG. It is supported so as to be rotatable in the direction indicated by the arrow C.
This upper unit 410 has a rotation detection member 420 , a holder 421 , a sensor 422 , and cable guides 423 and 424 . The upper unit 410 also has a right lever 441a shown in FIG.

The rotation detection member 420 is a crown-shaped resin member that is rotatably supported by the upper unit 410 and whose rotation is detected by a sensor 422 .
The holder 421 holds the sensor 422 and the cable 412 connected to the sensor 422 .

The sensor 422 is an optical sensor or the like held by the holder 421 and having a light emitting portion 422a and a light receiving portion 422b. A part of the rotation detecting member 420 is arranged between the light emitting portion 422a and the light receiving portion 422b, and the sensor 422 detects the notched portion and the non-notched portion of the rotation detecting member 420. to detect the rotation of the rotation detection member 420 . When the notch portion is arranged between the light-emitting portion 422a and the light-receiving portion 422b, the sensor 422 detects that the light emitted from the light-emitting portion 422a is received by the light-receiving portion 422b. When the non-notched portion is arranged between the portion 422b and the light-receiving portion 422b, the light-receiving portion 422b detects that the light emitted from the light-emitting portion 422a is blocked, thereby detecting the rotation of the rotation detecting member 420. FIG.

In this embodiment, the light-emitting portion 422a is arranged above and the light-receiving portion 422b is arranged below, but the light-emitting portion 422a may be arranged below and the light-receiving portion 422b may be arranged above.
A cable 412 is arranged between the substrate provided in the lower unit 411 and the sensor 422 of the upper unit 410 as wiring for transmitting electrical signals.
A cable guide 423 as a wiring holding portion is arranged between a substrate provided in the lower unit 411 and the sensor 422 of the upper unit 410 to hold the cable 412 .

The cable guide 424 is arranged between the cable guide 423 and a substrate provided on the lower unit 411 and locks the cable 412 .

FIG. 3 is an explanatory diagram of the arrangement of the upper unit in the first embodiment.
In FIG. 3, the upper unit 410 is arranged in the vicinity of one end in the width direction perpendicular to the rotation direction of the fixing belt 41a (the direction indicated by the arrow D in the drawing), and the one end in the width direction of the fixing belt 41a is arranged. It is rotatably supported by a guide member.

Rollers 430a and 430b are arranged at both end portions of the fixing belt 41a in the rotating direction so as to be in contact with the fixing belt 41a.
The rollers 430a and 430b are fixed to a rotating shaft 431, and the rotating shaft 431 rotates together with the rotation of the rollers 430a and 430b. That is, the rotating shaft 431 rotates according to the rotation of the fixing belt 41a.

A rotation detection member 420 of the upper unit 410 is attached to one end of the rotation shaft 431 , and the rotation detection member 420 rotates as the rotation shaft 431 rotates.
Therefore, the sensor 422 can detect the rotation of the fixing belt 41a by detecting the notched portion 420a and the non-notched portion 420b of the rotation detection member 420 that rotates.

A right lever 441a and a left lever 441b are provided at both ends of the fixing belt 41a in the rotation direction so as to be rotatable about a rotation fulcrum 413a and a rotation fulcrum 413b toward the main body of the image forming apparatus 1 shown in FIG. Supported. The right lever 441a is provided on the upper unit 410 having the sensor 422. As shown in FIG.
The right lever 441a and the left lever 441b are configured to be rotatable in a first direction indicated by an arrow B in the drawing, which is the same as the rotation direction of the fixing belt 41a, and in a second direction indicated by an arrow C, which is the opposite direction. ing.

The right lever 441a and left lever 441b rotatably support the fixing belt 41a and rollers 430a and 430b.

Therefore, by rotating the right lever 441a and the left lever 441b about the rotation fulcrum 413a and the rotation fulcrum 413b in the first direction indicated by the arrow B in FIG. By rotating the fixing belt 441a and the left lever 441b in the second direction indicated by the arrow C in the drawing, the fixing belt 41a can be brought into contact with the drive roller 41b.
At this time, the upper unit 410 rotates about the rotation fulcrum 413 with respect to the lower unit 411 shown in FIG. 1 as the right lever 441a rotates.

FIG. 4 is a perspective view showing the construction of the upper unit in the first embodiment. 4 is an enlarged view of the sensor 422 and the cable guide 423 of the upper unit 410, excluding the rotation detection member 420 shown in FIG.

4, the upper unit 410 has a connector terminal 425, a locking portion 426, a side guide 428, and side guides 429a and 429b in addition to the holder 421, sensor 422, and cable guide 423 described above. there is The upper unit 410 is rotatable in a first direction indicated by an arrow B and a second direction indicated by an arrow C in the figure.

A connector terminal 425 as a connecting portion is a terminal that connects the cable 412 and the sensor 422 and is provided above the sensor 422 . In this embodiment, the connector terminal 425 to which the cable 412 is connected is located above the sensor 422 at a position away from the fixing belt 41a shown in FIGS. are placed.

The locking portion 426 is arranged between the connector terminal 425 and the cable guide 423 in the route of the cable 412 and contacts the cable 412 connected to the connector terminal 425 . It is a notch that has been made. When the cable 412 connected to the connector terminal 425 is brought into contact with the locking portion 426, the cable 412 is restricted from moving in the rotational direction indicated by the arrow B in the figure.
Moreover, the locking portion 426 is formed with a notch extending in a direction perpendicular to the rotation direction of the upper unit 410 .

The side guide 428 is a projecting portion provided on the holder 421 on the downstream side of the engaging portion 426 in the rotational direction indicated by the arrow B in the figure, and is positioned at the end of the holder 421 in the direction orthogonal to the rotational direction of the upper unit 410 . located in the department. The side guide 428 guides the cable 412 restricted by the locking portion 426 .

The side guide 429a is a projecting portion provided on the holder 421 on the downstream side of the side guide 428 in the rotation direction indicated by arrow B in the figure, and is opposite to the side guide 428 in the direction orthogonal to the rotation direction of the upper unit 410. It is disposed at the end of the side holder 421 .

The side guide 429b is a protruding portion provided on the holder 421 on the downstream side of the side guide 429a and the cable guide 423 in the rotational direction indicated by arrow B in the figure, and is a side guide 421 in the direction orthogonal to the rotational direction of the upper unit 410. It is arranged at the end of the holder 421 opposite to the guide 428 .

The cable guide 423 is a guide portion provided in the holder 421 on the downstream side of the side guide 429a in the rotational direction indicated by the arrow B in the figure, and is a side guide of the holder 421 in the direction orthogonal to the rotational direction of the upper unit 410. It is arranged at the end on the 428 side. The cable guide 423 holds the cable 412 guided by the side guides 429a and 429b.

The cable guide 423 is formed in an L shape, regulates the end portion of the cable 412 in the direction orthogonal to the rotation direction of the upper unit 410 , and holds the cable 412 so as to sandwich the cable 412 with the holder 421 .
Thus, the cable guide 423 and the side guides 429 a and 429 b hold the cable 412 whose movement is restricted by the locking portion 426 .

Next, cable routes will be described with reference to FIGS. 1, 4 and 5. FIG.

As shown in FIGS. 1, 4 and 5, the cable 412 is held in the holder 421 by the cable guide 423 and the side guides 429a and 429b from the connector terminal 425 via the locking portion 426. As shown in FIG.

Thus, the cable 412 contacts and is locked by the locking portion 426 and is further held by the holder 421 by the cable guide 423 .

The operation of the configuration described above will be described.

First, the image forming operation performed by the image forming apparatus will be described with reference to FIG.
When the image forming apparatus 1 receives a print command including image information from an external device connected via a communication line or the like, the image forming apparatus 1 rotates the paper feed roller 32 to separate the medium P stacked in the paper feed cassette 20 and press the arrow in the figure. It is sent out in the medium conveying direction indicated by A and conveyed to the registration roller 33 , the developing device 12 and the transfer device 35 .

At this time, the developing device 12 (12C, 12M, 12Y, 12BK) performs a developing step of forming a toner image on the photosensitive drum.
Here, the developing process performed by the developing device 12C will be described as a representative. A similar developing process is performed in the developing devices 12M, 12Y, and 12BK.

When the development process is started, the photosensitive drum 121C of the developing device 12C rotates in the direction indicated by the arrow in the drawing, and along with the rotation, the surface is uniformly charged by the charging device 122C, and the exposure according to the image information is performed. An electrostatic latent image is formed by exposure of the device 123C, and the electrostatic latent image is developed by the developer supply device 124C to form a toner image.

The toner image formed on the photosensitive drum 121C is transferred onto the medium P conveyed in the medium conveying direction by the transfer belt 36 of the transfer device 35 .
The toner remaining on the photosensitive drum 121C after transfer is scraped off by a cleaning device, and after the surface of the photosensitive drum 121C is cleaned, the photosensitive drum 121C is subjected to the next charging by the charging device 122C, and a new development process starts. .

The above-described developing process is also performed by the developing devices 12M, 12Y, and 12BK, and all the black and yellow toner images necessary for image formation are transferred onto the medium P conveyed in the medium conveying direction by the transfer belt 36 of the transfer device 35. , magenta, and cyan are transferred, and the medium P is conveyed from the transfer device 35 to the fixing device 41 .

When the medium P to which the toner image has been transferred is conveyed, the fixing device 41 fixes the toner image on the medium P with heat and pressure by means of the fixing belt 41 a and the drive roller 41 b , and conveys the medium P to the discharge roller 42 . do.
The medium P conveyed to the discharge roller 42 is further conveyed outside the apparatus and stacked on the discharged paper stacking section 43 .

Next, the rotation operation of the upper unit of the fixing device will be described with reference to FIGS. 1 and 3. FIG.
When the right lever 441a and the left lever 441b shown in FIG. 3 are rotated in the first direction indicated by the arrow B in the drawing by the operator's operation, the fixing belt 41a is separated from the driving roller 41b with which it was in contact.
On the other hand, when the right lever 441a and the left lever 441b are rotated in the second direction indicated by the arrow C in the drawing by the operator's operation, the fixing belt 41a separated from the drive roller 41b comes into contact with the drive roller 41b.

At this time, upper unit 410 shown in FIG.
Also, the cable 412 connected to the sensor 422 of the upper unit 410 moves as the upper unit 410 rotates.

The cable 412 is connected to the sensor 422 via the connector terminal 425, is locked by the locking portion 426, and is held by the holder 421 by the cable guide 423 and the side guides 429a and 429b.

Therefore, the cable 412 is locked by the locking portion 426 against the rotational movement of the upper unit 410, and the base of the cable 412 and the connector terminal 425 are fixed so as not to move. As a result, the pulling load of the cable 412 due to the rotating motion of the upper unit 410 can be prevented from being transmitted to the connector terminal 425 .

In addition, when the fixing belt 41a is in contact with the drive roller 41b, the cable guide 423 of the upper unit 410 is arranged in the area connecting the rotation range of the engaging portion 426 and the rotation fulcrum 413. , the movement of the cable 412 can be suppressed.

6A and 6B are explanatory diagrams of the turning motion of the upper unit in the first embodiment, and are diagrams schematically showing the turning motion of the upper unit 410 and the cable guide 423. FIG.
In FIG. 6A, the upper unit 410 is rotatable between a first position PS1 and a second position PS2 around a rotation fulcrum 413 as a rotation fulcrum.

The first position PS1 is the position of the upper unit 410 when the fixing belt 41a is in contact with the drive roller 41b.
A second position PS2 is the position of the upper unit 410 when the fixing belt 41a is separated from the driving roller 41b.

In this embodiment, when the upper unit 410 is placed at the first position PS1, the engaging portion 426a of the upper unit 410 ( In this embodiment, the cable guide 423 is arranged within the area E connecting the rotation range (rotation locus) of the engaging portion 426 shown in FIGS.

Further, as shown in FIG. 6B, the first connecting portion 414 of the lower unit 411 to which the cable 412 is connected is located on the virtual plane of the rotation direction indicated by the arrows B and C in the figure of the upper unit 410. , perpendicular to the straight line L1 connecting the connector terminal 425 of the upper unit 410 to which the cable 412 is connected and the first connecting portion 414, and on the opposite side of the connector terminal 425 of the upper unit 410 across the straight line L2 passing through the rotation fulcrum 413. are placed in

Thus, when the cable guide 423 is arranged outside the area E by arranging the cable guide 423 so as to be positioned inside the area E in the state where the upper unit 410 is arranged at the first position PS1, , the rotation range of the cable 412 can be reduced, and the amount of movement of the cable 412 can be suppressed.

Therefore, the load on the cable 412 connected to the upper unit 410 can be reduced.

A modified example will now be described with reference to FIG.

As shown in FIG. 7, a slit 4261 is formed in the holder 421 at a position facing the connector terminal 425, and the cable 412 is passed through the slit 4261. may be wired. As a result, it is possible to suppress the load applied obliquely to the base of the cable 412 connected to the connector terminal 425 .

As described above, in the first embodiment, it is possible to reduce the load on the wiring connected to the upper unit as a movable member.
In addition, it is possible to suppress the vibration of the connector terminal, and it is possible to suppress the occurrence of poor contact of the wiring in the terminal portion.

Furthermore, it is possible to suppress the occurrence of wire breakage due to the rotation load of the wire without increasing the number of parts such as fixing with a binding band.

The second embodiment has a structure in which a winding portion for winding a cable is added to the upper unit of the first embodiment.
The configuration of the second embodiment will be described with reference to FIGS. 8 and 9. FIG. Parts similar to those of the above-described first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.

FIG. 8 is a schematic side view showing the construction of the fixing device in the second embodiment, and FIG. 9 is a perspective view showing the construction of the upper unit in the second embodiment. 9 is an enlarged view of the sensor 422 and the cable guide 423 of the upper unit 410, excluding the rotation detecting member 420 shown in FIG. 8(b) shows a state in which the upper unit 410 shown in FIG. 8(a) is rotated in the direction indicated by the arrow B in the figure.

9, upper unit 410 includes holder 421, sensor 422, cable guide 423, connector terminal 425, side guide 428, and side guides 429a and 429b described above, slit 4261, slit 4262, winding portion 427, It has a side guide 4281.

A slit 4261 as a locking portion is a notch formed in a U-shape in the holder 421 above the connector terminal 425 . The slit 4261 allows the cable 412 connected to the connector terminal 425 to be inserted in a direction perpendicular to the rotational direction of the upper unit 410, and the inserted cable 412 to rotate as indicated by arrows B and C in the figure. Regulate directional movement.

The slit 4262 is a notch formed in a U-shape in the holder 421 on the downstream side of the slit 4261 in the rotation direction indicated by the arrow B in the figure.
The slits 4261 and 4262 are formed with notches extending in a direction perpendicular to the rotation direction of the upper unit 410 .

A winding portion 427 as a wire fixing portion is formed in the holder 421 on the upstream side of the slit 4261 in the rotation direction indicated by the arrow B in the drawing, and the cable 412 is wound therearound. The winding portion 427 holds the cable 412 by winding the cable 412 inserted into the slit 4261 .

The winding portion 427 of this embodiment is arranged to face the connector terminal 425 together with the slit 4261 .

Cable 412 wound around winding portion 427 is inserted into slit 4262 and held by slit 4261 , winding portion 427 and slit 4262 .
The side guide 4281 is a protruding portion provided on the winding portion 427 and arranged at the end portion of the winding portion 427 in the direction perpendicular to the rotation direction of the upper unit 410 . The side guide 4281 guides the cable 412 wound around the winding portion 427 .

Thus, the cable guide 423 and the side guides 429 a and 429 b hold the cable 412 whose movement is restricted by the winding portion 427 and the slit 4261 .

Next, cable routes will be described with reference to FIGS. 8 and 9. FIG.

As shown in FIGS. 8 and 9, the cable 412 is wound from the connector terminal 425 through the slit 4261 around the winding portion 427, and further through the slit 4262 by the cable guide 423 and the side guides 429a and 429b. It is held by the holder 421 .

In this manner, the cable 412 is held in contact with the end portion of the slit 4261 on the rotational direction side indicated by the arrow C in the figure, and further held by the holder 421 with the cable guide 423 .

The operation of the configuration described above will be described.
Note that the image forming operation performed by the image forming apparatus is the same as that of the first embodiment, so the explanation is omitted.
The rotation operation of the upper unit of the fixing device will be described with reference to FIGS. 8 and 9. FIG.

Note that when the right lever 441a and the left lever 441b shown in FIG. 3 are rotated in the first direction indicated by the arrow B in the figure by the operator's operation, the fixing belt 41a is separated from the driving roller 41b with which it was in contact. are the same as in the first embodiment.

On the other hand, when the right lever 441a and the left lever 441b are rotated in the second direction indicated by the arrow C in the drawing by the operation of the operator, the fixing belt 41a separated from the driving roller 41b comes into contact with the driving roller 41b. are the same as in the first embodiment.

At this time, upper unit 410 shown in FIG.
Also, the cable 412 connected to the sensor 422 of the upper unit 410 moves as the upper unit 410 rotates.

The cable 412 is connected to the sensor 422 via the connector terminal 425, is wound around the winding portion 427 via the slit 4261, is fixed, and is locked by the slit 4262 to connect the cable guide 423, the side guide 429a, and the side guide 429a. It is held in the holder 421 by the guide 429b.

Therefore, the cable 412 is sandwiched and locked by the slit 4261 against the rotational movement of the upper unit 410, and the base of the cable 412 and the connector terminal 425 are fixed by the winding portion 427 so that they do not move, and are rotated. It is possible to prevent the tensile load of the cable 412 due to the operation from being transmitted to the connector terminal 425 .

In addition, the cable guide 423 of the upper unit 410 is arranged in the area connecting the rotation range of the slit 4261 and the rotation fulcrum 413 in a state where the fixing belt 41a is in contact with the driving roller 41b. 412 movement can be suppressed.
In this embodiment, as in the first embodiment, when the upper unit 410 shown in FIG. 9 and the rotation fulcrum 413, the cable guide 423 is arranged.

Further, as shown in FIG. 6(b), the first connection portion 414 of the lower unit 411 to which the cable 412 is connected is arranged in the plane of the rotation direction indicated by the arrow B and the arrow C in the figure of the upper unit 410. It is orthogonal to the straight line L1 connecting the connector terminal 425 of the upper unit 410 to which the cable 412 is connected and the first connecting portion 414, and is on the opposite side of the connector terminal 425 of the upper unit 410 across the straight line L2 passing through the rotation fulcrum 413. are placed.

Thus, when the cable guide 423 is arranged outside the region E by arranging the cable guide 423 so as to be positioned inside the region E in the state where the upper unit 410 is arranged at the first position PS1, , the rotation range of the cable 412 can be reduced, and the amount of movement of the cable 412 can be suppressed.

Therefore, the load on the cable 412 connected to the upper unit 410 can be reduced.

In this embodiment, the movement of the cable 412 is restricted by the winding portion 427 and the slit 4261, so that the load applied to the cable 412 can be further reduced compared to the first embodiment.
As described above, in the second embodiment, in addition to the effects of the first embodiment, it is possible to further reduce the load on the wiring connected to the upper unit as a movable member. .

In the first and second embodiments, the image forming apparatus is described as a printer, but the image forming apparatus is not limited to this, and may be a copying machine, a facsimile machine, a multifunction peripheral (MFP), or the like.
Moreover, although the example in which the cable is connected to the sensor has been described, the cable may be connected to an actuator such as a motor or a solenoid without being limited thereto.

1 Image forming apparatus 12 (12C, 12M, 12Y, 12K) Developing device 20 Paper feed cassette 33 Registration roller 35 Transfer device 41 Fixing device 41a Fixing belt 41b Drive roller 410 Upper unit 411 Lower unit 412 Cable 413 Rotation fulcrum 420 Rotation detection member 421 holder 422 sensor 423, 424 cable guide 425 connector terminal 426 locking portion 4261, 4262 slit 427 winding portion 428, 4281, 429a, 429b side guide 430a, 430b roller 431 rotating shaft 441a right lever 441b left lever

Claims (7)

a support that rotatably supports the first rotating body;
rotatably supporting the second rotor and holding wiring connected to the support;
a rotating member rotatably supported by the support;
has
The rotating member is
a connecting portion to which the wiring is connected;
a wiring holding part that holds the wiring;
a locking portion disposed between the connection portion and the wire holding portion and in contact with the wire connected to the connection portion;
has
The rotating member is
A first position where the second rotating body and the first rotating body are brought into contact with each other and a first position where the second rotating body and the first rotating body are separated from each other about the rotation fulcrum. is rotatable between 2 positions,
The wiring holding part is
In a state in which the rotating member is arranged at the first position, in the rotating direction of the rotating member, the rotating range of the locking portion of the rotating rotating member and the rotating range of the rotating member A fixing device, wherein the fixing device is arranged in a region connecting the fulcrum. The fixing device according to claim 1,
The fixing device, wherein the engaging portion is arranged to face the connecting portion. The fixing device according to claim 2,
The rotating member has a wire fixing portion around which the wire is wound,
The fixing device according to claim 1, wherein the wire fixing portion and the locking portion are arranged to face the connecting portion. The fixing device according to claim 3,
The fixing device according to claim 1, wherein the wire fixing portion is provided upstream of the engaging portion in a rotational direction from the first position to the second position. The fixing device according to any one of claims 1 to 4,
The first connecting portion of the supporting portion to which the wiring is connected is arranged to be connected to the second connecting portion of the rotating member to which the wiring is connected and the first connecting portion of the rotating member on a virtual plane in the rotating direction of the rotating member. wherein the fixing device is arranged on the opposite side of the connecting portion of the rotating member with a straight line passing through the pivot point interposed therebetween. In the fixing device according to any one of claims 1 to 5,
The fixing device, wherein the connecting portion is provided in a sensor that detects rotation of the second rotating body. An image forming apparatus having a fixing device for fixing developer transferred to a medium,
An image forming apparatus comprising the fixing device according to claim 1 .

Images