JP2007094265A - Support mechanism for device and safety device for image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support mechanism for a device, the support mechanism being capable of securely detecting an abnormal installation attitude of the device without spoiling the outer appearance of the device and without being easily broken. <P>SOLUTION: The support mechanism for the device has a caster, which includes a wheel frame to which a shaft is attached, the shaft supporting a wheel so that the wheel swivels freely. In the support mechanism, the cater 16 is attached to the bottom 17 of the device via a switching mechanism freely switched between the support attitude in which the caster supports the device in contact with a placing area and the non-support attitude different from the support attitude. The support mechanism is provided with a position detection mechanisms 8, which detects whether the caster 16 is in the support attitude or non-support attitude. The attitude detection mechanism 7 is composed of a hinge mechanism 21 capable of being swung around an axis parallel to a shaft part 23. The attitude detection mechanism 8 detects the support attitude in which the upper face of the wheel frame 23 is in contact with the bottom 17 and the non-support attitude in which the upper face of the wheel frame is separated from the bottom as a result of being swung by the hinge mechanism. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes a support mechanism for a device and a safety device for an image forming apparatus, which includes a wheel and a wheel frame to which a shaft portion that freely supports the wheel is attached, and includes a caster that supports the device with respect to the mounting portion. About.

  2. Description of the Related Art Conventionally, casters are widely used as a support mechanism that can support a heavy equipment and can easily move the equipment.

  For example, in Patent Document 1 shown below, for the purpose of enabling detection of the operation of a stopper for a caster of a moving device that must be used after being fixed, it is downward from the bottom of the moving device. The extending fixed shaft is erected from the center of the flat bearing, and the wheel frame that is rotated by the bearing is provided with an axle that is eccentric from right below the fixed shaft and is orthogonal to the fixed shaft, and the wheel is attached to the axle so that the moving device is optional. The axle is provided with a lock plate that locks the wheel by performing a seesaw motion around the axle, and the operation part provided on one side of the lock plate moves upward to release and moves downward. In a caster with a locking mechanism for locking, a disc-shaped push plate centered on a fixed shaft is loosely fitted on the fixed shaft, and a switch is provided at the bottom of the moving device so that the movable end is placed over the push plate. A caster with a lock detecting mechanism is characterized in that the driving end opposite to the operation portion of the plate abuts against the pressing plate when locked, and the pressing plate that rises against spring force or gravity switches the switch via the movable end. Proposed.

  In recent years, in order to avoid secondary disasters such as fires caused by equipment damaged by earthquakes and other disasters, the need to install safety devices on equipment has increased, but acceleration sensors that detect vibrations caused by earthquakes are generally expensive. There is a problem that a plurality of sensors must be arranged in order to detect the posture of the device using such a sensor.

As a safety device that detects the installation posture of such a device and shuts off the power supply when the device falls, Patent Document 2 discloses a first contact point of a movable plate provided on the lower surface of a support substrate, and the first device described above. A fixed plate provided with a second contact opposite to the contact and a sliding body that is slidable up and down protruding from the bottom surface of the device main body, and in its first state in which the device main body is installed on the installation surface The sliding body presses the movable plate to short-circuit the first and second contacts, and in a second state in which the device body falls before or after the installation surface, the sliding body is springy of the movable plate. A technique for providing an overturning switch that releases the pressure by pressing the first contact point and the second contact point into an open state and constitutes a posture detection mechanism that stops all power supply to the device when the device falls. Proposed.
Japanese Patent Laid-Open No. 11-165501 Japanese Patent Laid-Open No. 10-12106

  It is difficult to attach the above-described conventional posture detection mechanism as it is to a heavy equipment supported by the above-mentioned caster from the viewpoint of mechanism, size, strength, etc. There is also a problem that the aesthetic appearance is impaired if it is extended. Furthermore, when the device is moved by a caster, the posture detection mechanism may be caught on the floor and damaged.

  In view of the above-described problems, the object of the present invention is to provide a device support mechanism that can reliably detect an abnormality in the installation posture of the device without damaging the aesthetics and without being easily damaged, and such a support mechanism. And providing a safety device for the image forming apparatus.

  In order to achieve the above-mentioned object, the first characteristic configuration of the support mechanism of the device according to the present invention is that, as described in claim 1 of the claims, the wheel and the shaft portion that idles and supports the wheel are provided. A support mechanism for a device comprising a caster for supporting the device with respect to the mounting portion, the support posture for supporting the device in contact with the mounting portion; An attitude for detecting whether the caster is in the support attitude or the non-support attitude while attaching the caster to the bottom of the device via an attitude switching mechanism that can be switched to a non-support attitude different from the support attitude. The point is that a detection mechanism is provided.

  According to the above-described configuration, in a normal use state, the caster that maintains the support posture supports the device in a predetermined posture with respect to the floor or the like that is the placement unit. The caster is switched to the non-supporting posture by the posture switching mechanism. Since the posture detection mechanism detects whether the caster is in the support posture or the non-support posture, it is possible to take necessary measures corresponding to the caster. Therefore, it is not necessary to provide the posture detection mechanism separately from the support mechanism of the device, and the support mechanism is also used as the posture detection mechanism as it is, so that the manufacturing cost of the device is not increased without greatly increasing the number of parts. It is now possible to reliably detect abnormalities in the installation posture of the equipment without damaging the aesthetics and without easily damaging it.

  As described in claim 2, the second characteristic configuration includes the hinge switching mechanism capable of swinging around an axis parallel to the shaft portion in addition to the first characteristic configuration described above. Then, the posture detecting mechanism is either the supporting posture in which the upper surface of the wheel frame is in contact with the bottom portion or the non-supporting posture in which the upper surface of the wheel frame is separated from the bottom portion by swinging by the hinge mechanism. It is in the point which is comprised so that it may detect.

  According to the above-described configuration, in a normal installation posture, the wheel frame is pressed by the weight of the device, so that the upper surface of the wheel frame is maintained in the support posture in contact with the bottom portion, and the device falls down or vibrates. In the case of floating from the floor surface, the upper surface of the wheel frame is switched to the unsupported posture separated from the bottom by a hinge mechanism, so that the posture detection mechanism can detect which posture the wheel frame is in. It will be possible.

  In addition to the second feature configuration described above, the third feature configuration includes a biasing mechanism that biases the caster from the support posture to the non-support posture in addition to the second feature configuration described above. It is in the point provided.

  According to the above-described configuration, when the device is lifted from the floor surface due to overturning or vibration, the urging mechanism forcibly switches to the unsupported posture in which the upper surface of the wheel frame is separated from the bottom portion. An unsupported posture can be detected. On the other hand, in the normal installation posture, the wheel frame is pressed by the weight of the device, so that the upper surface of the wheel frame is maintained in the support posture in contact with the bottom portion against the urging force by the urging mechanism.

  In the fourth feature configuration, in addition to the second or third feature configuration described above, the posture regulation that regulates the swing angle of the caster in the non-supporting posture within a predetermined range. It has the mechanism.

  According to the above configuration, when the upper surface of the wheel frame swings to the unsupported posture separated from the bottom by the hinge mechanism, the swing angle of the caster, that is, the upper surface of the wheel frame and the device is The angle formed with the bottom surface is regulated within a predetermined range. For example, even if the equipment springs up due to an earthquake and the caster falls from a rocked state to a normal installation posture, the rocking angle Therefore, it is possible to avoid an abnormal state in which the rocking angle is swung in the opposite direction and is broken.

  In the fifth feature configuration, as described in claim 5, in addition to the first feature configuration described above, the wheel frame is configured so that the shaft switching portion is movable in a perspective direction with respect to the bottom portion. The posture detection mechanism is either the supporting posture in which the shaft portion is close to the bottom portion or the non-supporting posture in which the shaft portion is separated from the bottom portion. It is in the point comprised so that it may detect.

  According to the above configuration, in a normal installation posture, the shaft portion of the wheel frame is pressed by the weight of the device, so that the shaft portion is maintained in the support posture close to the bottom portion, and the device falls or vibrates. In such a case, the shaft portion is switched to the non-supporting posture in which the shaft portion is separated from the bottom portion by the shaft portion moving attachment mechanism, so that the posture detecting mechanism determines which posture the shaft portion is in. It can be detected.

  In the sixth feature configuration, as described in claim 6, in addition to the fifth feature configuration described above, the shaft portion moving attachment mechanism biases the shaft portion from the support posture to the non-support posture. This is in that a force mechanism is provided.

  According to the above-described configuration, when the device is lifted from the floor surface due to overturning or vibration, the shaft portion is forcibly switched to the non-supporting posture separated from the bottom portion by the biasing mechanism, so that the non-supporting is surely performed. The posture can be detected. On the other hand, in the normal installation posture, the shaft portion is pressed by the weight of the device, so that the shaft portion is maintained in the support posture close to the bottom portion against the urging force of the urging mechanism.

  In the seventh feature configuration, in addition to the fifth or sixth feature configuration described above, the shaft portion moving attachment mechanism is provided along guide grooves formed in both side surfaces of the wheel frame. The shaft portion is configured to be movably supported.

  According to the above-described configuration, a mechanism in which the shaft portion moves close to or away from the bottom surface can be configured very easily.

  The characteristic configuration of the safety device of the image forming apparatus according to the present invention is the primary structure of the power transformer including the device support mechanism having any one of the first to seventh characteristic configurations described above. A power line is branched from a secondary side of the power transformer to a secondary power line that feeds power to the second load, and the second load causes the first power line to feed the first load. A power supply that is a safety device for an image forming apparatus in which one load is controlled, and that cuts off power supply to the primary power line when the posture detection mechanism detects that the leg is in a non-supporting posture. In the point which has the interruption circuit.

  According to the above-described configuration, when the posture detection mechanism detects that the image forming apparatus is lifted from the floor surface due to an earthquake or the like, falls, or tilts, the power cutoff circuit supplies the primary power line to the primary power line. Since the power supply is cut off, it is possible to avoid a serious secondary disaster such as a fire due to a large-capacity primary load and abnormalities that occur around it, while the power supply to the secondary power line is maintained. Stopping the entire operation of the device can be avoided.

  As described above, according to the present invention, there is provided a device support mechanism that can reliably detect an abnormality in the installation posture of the device without damaging the aesthetics and without being easily damaged, and such a support mechanism. It is now possible to provide a safety device for the image forming apparatus.

  Hereinafter, an embodiment in which the device support mechanism according to the present invention is applied to a safety device of an image forming apparatus will be described.

  As shown in FIG. 1, the digital multi-functional peripheral 1 as an example of equipment has a copy function, a print function, and a facsimile function, and copies with a plurality of menu setting keys for setting various operation menus and set menus. An operation unit 11 provided with a start key for starting an operation, a facsimile operation, and the like; an image reading unit 13 that sequentially reads a series of documents set on the document placement unit 12 and converts them into electronic data; and the image reading unit An electrophotographic image forming unit 14 that forms and outputs a toner image on paper based on the image data converted into electronic data by the unit 13, a paper feed cassette 15 that stores paper, and a bottom metal plate 17. The caster 16 is provided at four corners.

  The support mechanism according to the present invention is incorporated in one of the casters 16 described above, and is provided on the bottom portion 17 of the device 1 as shown in FIG. The caster 16 includes a wheel 22 to be supported and a wheel frame 24 to which a shaft portion 23 for loosely supporting the wheel 22 is attached.

  The support mechanism moves the casters 16 through a posture switching mechanism 7 that can be switched between a support posture in contact with the mounting portion A to support the device 1 and a non-support posture different from the support posture. While being attached to the bottom portion 17 of the device 1, a posture detecting mechanism 8 is provided for detecting whether the caster 16 is in the support posture or the non-support posture.

  The posture switching mechanism 7 includes a hinge mechanism 21 that is fastened to the bottom portion 17 of the device 1 by a bolt 18 and can swing around an axis parallel to the shaft portion 23. A torsion spring is interposed as a biasing mechanism 29 that biases the caster 16 from the support posture to the non-support posture.

  Therefore, when the device 1 is normally installed, the wheel frame 24 is pressed by the weight of the device 1, so that the upper surface of the wheel frame 24 is maintained in a supporting posture in contact with the bottom portion 17, When the device 1 is lifted from the floor surface due to overturning or vibration, the hinge mechanism 21 is configured to switch the upper surface of the wheel frame 24 to a non-supporting posture in which the wheel frame 24 is separated from the bottom portion 17. When the device 1 is lifted from the floor surface due to overturning or vibration, the biasing mechanism 29 swings and biases in a direction away from the bottom portion 17 so that the wheel frame 24 is surely switched to the non-supporting posture. Has been.

  Furthermore, a posture regulating mechanism 25 is provided for regulating the swing angle of the caster 16 in a non-supporting posture within a predetermined range. The posture control mechanism 25 is inserted at one end into a posture control plate 26 fixed to the bottom portion 17 with screws 18 and a slot (a region surrounded by upper and lower broken lines in the figure) bored in the posture control plate 26. The posture control rod 27 is configured such that the other end side of the posture control rod 27 is welded to the wheel frame 24.

  Therefore, when the upper surface of the wheel frame is swung to the unsupported posture separated from the bottom by the hinge mechanism, the swing angle of the caster, that is, the upper surface of the wheel frame and the bottom surface of the device is formed by the posture regulating mechanism. Since the angle is regulated within a predetermined range, the swing angle is limited even when the equipment jumps up due to an earthquake, for example, and the caster falls from a swinging state to a normal installation posture. Therefore, it is possible to avoid an abnormal state in which the rocking angle is swung in the reverse direction and damaged.

  The posture detection mechanism 8 includes a convex portion 82 formed on the upper surface of the wheel frame 24 and a micro switch 80 operated by the convex portion 82. As shown in FIG. When the upper surface of 24 comes into contact with the bottom portion 17, the swing lever 81 attached to the microswitch 80 and biased downward is swayed upward by the convex portion 82, that is, shifts to a support posture. Thus, it is detected that the installation posture is in a normal state, and as shown in FIG. 2B, the wheel frame 24 is swung by the hinge mechanism 21 so that the upper surface of the wheel frame 24 is separated from the bottom portion 17. When this is done, it is detected that the installation posture is in an abnormal state by moving the convex portion 82 away from the swing lever 81, that is, shifting to a non-supporting posture.

  Hereinafter, an embodiment in which the posture detection mechanism 8 provided in the above-described support mechanism is applied to a safety device of an image forming apparatus will be described. For convenience of explanation, it is assumed that the image forming apparatus 1 shown in FIG. 1 has two power supply configurations inside the apparatus.

  As shown in FIG. 4, the power supply circuit of the digital multi-function peripheral 1 includes a primary power supply line 20 that supplies power to the first load 2 from the primary side of the power transformer 4 that is supplied from the commercial power supply via the main switch 5. The power line is branched to a secondary power line 30 that feeds power to the second load 3 from the secondary side of the power transformer 4 so that the first load 2 is controlled by the second load 3. It is configured.

  More specifically, a heater serving as a heat source of a fixing device provided in the image forming unit 14 is connected to the primary power line 20 as a first load 2, and the power transformer is connected to the secondary power line 30. A secondary-side power circuit 31 as an AC / CD converter that converts the AC voltage stepped down at 4 into a DC voltage, and a built-in device group 34 such as a motor and a clutch related to an image forming operation by the digital multi-function peripheral 1. A second load 3 comprising a control unit 32 having a microcomputer for controlling the drive of the built-in device group 34 at a predetermined timing is connected, and the control unit 32 provides a heater serving as the first load 2 and the built-in device. The device group 34 is configured to be controlled.

  The configuration of the control unit 32 will not be described in detail, but a memory for spooling print data when operating as a printer, an NCU circuit connected to an external line when operating as a facsimile, and an image data encoding / combining processing unit And a memory for storing image data.

  The safety device of the digital multifunction device 1 includes the above-described posture detection mechanism that detects an abnormality in the installation posture of the digital multifunction device 1, and the primary-side power supply when the posture detection mechanism detects an abnormality in the installation posture. A power cut-off circuit 6 for cutting off the power supply to the line 20 is provided.

  When the digital multifunction device 1 is normally placed on the floor surface A, the posture detection mechanism is configured such that when the upper surface of the wheel frame 24 contacts the bottom portion 17 as shown in FIG. When the micro switch 80 is turned on and the digital multi-function peripheral 1 is lifted from the floor A due to vibration caused by an earthquake or the like, or falls over, the upper surface of the wheel frame 24 is the bottom 17 as shown in FIG. And the micro switch 80 is turned off.

  If the control unit 32 determines that the installation posture is abnormal based on the detection state by the posture detection mechanism 8, the control unit 32 shuts off the power supply cutoff circuit 6 and stops power supply to the heater. Specifically, this can be realized by configuring the power shut-off circuit 6 as a relay circuit and switching the connection state of the relay contact by switching the relay coil to the activated or deactivated state according to the control signal from the control unit 32. . If the relay coil is directly controlled by the signal from the microswitch 70, it can be directly controlled without the control circuit 32.

  According to the above-described configuration, when the image forming apparatus falls due to a shake caused by an earthquake or the like, protrudes from a dedicated desk, or falls, the power supply to the primary power line is cut off. In addition, it is possible to avoid a serious secondary disaster caused by an abnormality in the vicinity thereof, while the power supply to the secondary power supply line is maintained, so that the operation stop of the entire image forming apparatus can be avoided. It is.

  Further, as shown in FIG. 5, the control unit 32 as the second load 3 includes an abnormality detection unit 35 that detects an abnormality of the heater as the first load 2, and the abnormality detection unit 35 includes the abnormality detection unit 35. By configuring so that the abnormality detection operation is stopped when the power shut-off circuit 6 is activated, even if the power supply to the first load 2 is shut off, the first load 2 is set as a pseudo-normal state. It is comprised so that operation | movement of parts other than can be continued.

  In a normal state, the control unit 32 uses a semiconductor relay or the like to maintain the roller temperature of the fixing unit at a predetermined temperature based on a detected temperature signal from a thermistor (not shown) that detects the temperature of the heater. The abnormality detection unit 35 is configured to control whether or not the temperature fluctuating due to power supply to the heater becomes an abnormal level based on a temperature signal detected by a thermistor. If it is determined that the heater is abnormal, a display indicating that a failure has occurred is displayed on the operation unit 11, and the apparatus is controlled to stop.

  When it is detected that the installation posture of the apparatus is abnormal, it is determined that the heater is disconnected by the abnormality detection unit 35 and the temperature cannot be raised as a result of the power supply to the heater being cut off by the power cut-off circuit 6. When it is determined that an abnormality has occurred in the heater, the abnormality detection unit 35 stops detecting the abnormality of the heater, or even if it detects an abnormality, the apparatus is controlled to operate in a pseudo-normal state without shifting to the abnormal state. It is.

  As a result, stop control other than the first load, which is executed when an abnormality in the first load is detected, is avoided while avoiding a serious secondary disaster. Various troubles can be avoided.

  Specifically, when the digital multi-function peripheral 1 is used as a network printer, it is possible to continue the spool operation of print data in response to a print request requested on the network. In this case, the image data transmitted from the outside can be buffered in the memory, or the image data transmission processing to the outside can be continued.

  Below, another embodiment of the support mechanism of the apparatus by this invention is described. Needless to say, this embodiment can also be applied as the above-described safety device. As shown in FIG. 3, the posture switching mechanism 7 includes a shaft portion moving attachment mechanism 3 in which a shaft portion 32 is attached to a wheel frame 31 so that the shaft portion 32 can move in a perspective direction with respect to the bottom portion of the device. The mechanism 8 may be configured to detect the support posture in which the shaft portion 32 is close to the bottom portion or the non-supporting posture in which the shaft portion 32 is separated from the bottom portion. Good.

In this case, it is preferable to provide an urging mechanism 36 for urging the shaft portion 33 from the support posture to the non-support posture in the shaft portion movement attachment mechanism 3, and the shaft portion movement attachment mechanism 3 is provided on both sides of the wheel frame 31. It is preferable that the shaft portion 32 is movably supported along the guide groove 37 formed in the surface.
As shown in FIG. 3A, the caster 16 is fastened to the wheel frame 31 with bolts 18 from the outside of the device in a state where the posture switching mechanism 7 and the posture detection mechanism 8 are accommodated. The image forming apparatus 1 is fixed to the bottom portion 17.
The shaft portion moving attachment mechanism 3 is configured to support the shaft portion 32 movably along guide grooves 33 formed on both side surfaces of the wheel frame 31, and is provided above the guide grooves 33. A push spring 36 is provided at both ends of the upper convex portion 34 and the axle 32 to a lower convex portion 35 provided in the direction of the equipment bottom 17, and the shaft portion 32 moves in the guide groove 33. A narrow diameter portion 38 provided with the enlarged diameter portion 37 and the pressing spring 36 is provided.
Also, the posture detection mechanism 8 is either the support posture in which the shaft portion 32 of the shaft portion moving attachment mechanism 3 is close to the bottom portion 17 or the non-supporting posture in which the shaft portion 32 is separated from the bottom portion. , A switch roller 83 that contacts the outer circle portion of the wheel 39, and the switch roller 83 that contacts the outer circle portion of the wheel 39 when the shaft portion 32 approaches the bottom portion 17. A switch that tells the switch 80 whether the switch roller 83 is in the support posture or the non-support posture in which the switch roller 83 is separated from the outer circle portion of the wheel 39 when the shaft portion 32 is separated from the bottom portion 17. A lever 81 is used.
In the posture switching mechanism 7, the wheel 39 is in contact with the mounting portion A and the shaft portion 32 of the shaft portion moving attachment mechanism 3 is close to the bottom portion 17 to support the image forming apparatus 1. 3A, when the wheel 39 is pressed toward the bottom 17 side, the enlarged diameter portion 37 of the guide groove 33 is pushed toward the bottom 17 side so that the axle 32 is pressed toward the bottom 17 side. The image forming apparatus 1 comes into contact with the upper portion of the diameter portion 37 and is in a stable support state.
Conversely, when the wheel 39 separates the mounting portion A and the shaft portion 32 of the shaft portion moving attachment mechanism 3 separates from the bottom portion 17 and takes the non-supporting posture in which the image forming apparatus 1 is not supported. As shown in FIG. 3B, the wheel 39 is separated from the bottom portion 17 side, whereby the axle 32 is separated from the upper portion of the enlarged diameter portion 37 of the guide groove 33, and the image forming apparatus 1 is not supported. It becomes a state.
In the posture detection mechanism 8, when the image forming apparatus 1 is in the support state, the switch roller 83 is moved when the shaft portion 32 comes close to the bottom portion 17 as shown in FIG. The switch 80 detects that the image forming apparatus 1 is in the support posture, in contact with the outer circle portion of the wheel 39.
On the contrary, when the image forming apparatus 1 is in an unsupported state, as shown in FIG. 3B, when the shaft portion 32 is separated from the bottom portion 17, the switch roller 83 is connected to the wheel 39. The switch is separated from the outer circle, and the switch detects that the image forming apparatus 1 is in the unsupported posture.

  In the above-described embodiment, the support roller or the unsupported state is detected by detecting that the switch roller 83 contacts the outer circle part of the wheel 39 or is separated from the outer circle part of the wheel 39. However, the support lever or the unsupported state may be detected with an arbitrary refraction angle of the switch lever 81 provided with the switch roller 83.

  The embodiment described above is merely an example of the present invention, and it goes without saying that the specific configuration and the like of each block can be appropriately changed and designed within the scope of the effects of the present invention.

The perspective view which shows the whole structure of an image forming apparatus. (A) is a cross-sectional view in a supporting posture of a caster provided with a hinge mechanism capable of swinging around an axis parallel to the shaft portion of the image copying apparatus, and (b) is a cross-sectional view in a non-supporting posture. 9A is a cross-sectional view of a posture support mechanism 7 of an image copying apparatus in a support posture of a caster provided with a shaft portion moving attachment mechanism in which the shaft portion is attached to the wheel frame so as to be movable in a perspective direction with respect to the bottom portion. , (B) is a sectional view in an unsupported posture Functional block diagram related to safety device of image forming apparatus Functional block diagram related to a safety device of an image forming apparatus having an abnormality detection unit

Explanation of symbols

1: Image forming apparatus 3: Shaft portion moving attachment mechanism 7: Posture switching mechanism 8: Posture detection mechanism 16: Caster 17: Bottom portion 21: Hinge mechanism 22: Wheel 23: Shaft portion 24: Wheel frame 25: Posture control mechanism 26: Posture control plate 27: Posture control rod 31: Wheel frame 32: Shaft portion 33: Guide groove 34: Upper convex portion 35: Lower convex portion 36: Push spring 37: Expanded portion 38: Narrow portion 39: Wheel 80: Switch 81: Switch lever 82: Convex part 83: Switch roller A: Placement part

Claims (8)

A support mechanism for a device comprising a wheel and a wheel frame to which a shaft portion for supporting the wheel idle is attached, and comprising a caster for supporting the device with respect to the mounting portion;
The caster is attached to the bottom of the device via a posture switching mechanism that can be switched between a support posture that contacts the mounting portion and supports the device, and a non-support posture that is different from the support posture, and A support mechanism for a device provided with a posture detection mechanism for detecting whether the caster is in the support posture or the non-support posture.   The posture switching mechanism is configured by a hinge mechanism that can swing around an axis parallel to the shaft portion, and the posture detection mechanism is configured such that the upper surface of the wheel frame is in contact with the bottom portion, and the hinge The apparatus support mechanism according to claim 1, wherein the apparatus is configured to detect the unsupported posture in which the upper surface of the wheel frame is separated from the bottom by swinging by a mechanism.   The device support mechanism according to claim 2, wherein the hinge mechanism is provided with a biasing mechanism that biases the caster from the support posture to the non-support posture.   The apparatus support mechanism according to claim 2, further comprising an attitude restriction mechanism that regulates a swing angle of the caster in the non-support attitude within a predetermined range.   The posture switching mechanism includes a shaft portion moving attachment mechanism that is attached to the wheel frame so that the shaft portion is movable in a perspective direction with respect to the bottom portion, and the posture detecting mechanism is close to the bottom portion. The device support mechanism according to claim 1, wherein the support posture is configured to detect either the support posture or the unsupported posture in which the shaft portion is separated from the bottom portion. The device support mechanism according to claim 5, wherein the shaft portion moving attachment mechanism is provided with a biasing mechanism that biases the shaft portion from the support posture to the non-support posture. The device support mechanism according to claim 5 or 6, wherein the shaft portion moving attachment mechanism is configured to movably support the shaft portion along guide grooves formed in both side surfaces of the wheel frame. A support side for a device according to any one of claims 1 to 7, comprising: a primary side power line that feeds power from the primary side of the power transformer to the first load; and a secondary side of the power transformer from the secondary side to the second load. A safety device for an image forming apparatus in which a power supply line is branched to a secondary power supply line that supplies power, and the first load is controlled by the second load, and the legs are not supported by the posture detection mechanism A safety device for an image forming apparatus, comprising: a power shut-off circuit that shuts off power supply to the primary power line when it is detected that the posture is detected.

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