JP3597768B2 - Image forming apparatus and inspection method thereof - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image forming apparatus such as a copying machine, a facsimile or a printer, and an inspection method therefor.
[0002]
[Prior art]
An image forming apparatus such as a copying machine, a facsimile or a printer is formed by mounting various mechanical and electrical devices in a box-shaped casing, and various product inspections are performed at the final stage of the manufacturing process, and only a passing product is obtained. Although it is shipped, there is a pressure resistance test among the above product inspections. This withstand voltage test is to check whether or not there is a short-circuited portion in a primary circuit (for example, a circuit using a commercial power supply of 100 volts) in the apparatus, and a withstand voltage test capable of applying a voltage of approximately 1000 volts. This is performed using a vessel.
[0003]
That is, one of a pair of terminals drawn out of the pressure resistance tester is connected to a terminal of a plug attached to the tip of a lead wire drawn out of the casing, and the other terminal of the pressure resistance tester is connected to a proper position of the casing. And apply a voltage of 1000 volts to them. The withstand voltage tester is provided with a display unit. When a high voltage is applied, if a short-circuit location is present, the short-circuit is displayed.
[0004]
By the way, a heater for development processing exists in the primary circuit. This heater is provided inside a heating roller used to fix a transfer image by toner on transfer paper, and is supplied with electric power from a commercial power supply by an operation of a relay device provided in a secondary circuit in a casing. Is supplied, and the relay device is off when the machine is normally turned off. Therefore, when performing a withstand voltage test, it is necessary to set the contacts of the relay device to the ON state so that there is no non-conductive portion in the primary circuit. However, power is not supplied to the secondary circuit during the test. Conventionally, a predetermined jig is inserted from the outside and the contact of the relay is pressed to set the relay device to an ON state, and in this state, a withstand voltage test has been performed.
[0005]
[Problems to be solved by the invention]
However, the appearance of the ON state of the relay device, which presses the contacts of the relay using the jig as described above, is very unstable, and it is determined whether the relay device is surely in the ON state. However, there was an inconvenience that the result of the pressure test had a problem in reliability.
[0006]
The present invention has been made in order to solve the above-described problems, and an image forming apparatus and an inspection method thereof that are configured to perform a reliable withstand voltage test in which inspection results have high reliability exist. It is intended to provide.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, the energized state of the primary circuit is determined. , Connected to the secondary circuit And operates according to a control signal from the secondary circuit. In an image forming apparatus in which an electric component configured to be secured by an ON operation of a relay device is provided in a body, an ON operation of the relay device is performed by an external power supply circuit different from the secondary circuit. A connector for power supply is provided.
[0008]
According to the present invention, by connecting the connector on the external power supply circuit to the connector on the fuselage side, the relay device is turned on even without power supply from the secondary circuit side, and the primary circuit in the aircraft is connected. In this state, one of the opposite electrodes of a predetermined withstand voltage tester to which a high voltage is applied can be connected to the primary circuit side, and the other can be connected to the body to apply a high voltage. However, an inspection for detecting the presence / absence of a short circuit between the primary circuit and the machine body can be performed by detecting the state of conduction between the opposed electrodes.
[0009]
As described above, since the relay device is operated by the power supply from the external power supply circuit, the conventional method of mechanically connecting the contacts of the relay device from outside the device using a predetermined jig is used. In comparison, the ON operation of the relay device can be performed easily and reliably, and the reliability of the inspection result is improved.
[0010]
In the present invention, the term “connector” refers to an electrical connection jig, but the concept of a connector also includes a so-called bare electric wire in which the coating at the end of the electric wire is simply turned. That is, such bare wires are electrically connected to each other by being connected to each other.
[0011]
According to a second aspect of the present invention, in the image forming apparatus according to the first aspect, the connector is provided at an appropriate position of an airframe to which a connector of the external power supply circuit located outside the airframe can be connected. Is what you do.
[0012]
According to the present invention, the connector on the external power supply circuit side can be easily connected to the connector on the fuselage side, which contributes to quick inspection.
[0013]
According to a third aspect of the present invention, the energized state of the primary circuit is determined. , Connected to the secondary circuit And operates according to a control signal from the secondary circuit. In an inspection method of an image forming apparatus in which an electric component configured to be secured by an ON operation of a relay device is provided in a body, an ON operation of the relay device is performed by an external power supply different from the secondary circuit. With the relay device turned on by the power supply from the circuit, one of the opposite electrodes of the withstand voltage tester that applies a high voltage is connected to the primary circuit side, and the other is connected to the fuselage and the high voltage is applied. And detecting the presence or absence of a short circuit between the primary circuit and the body by detecting the state of conduction between the opposed electrodes.
[0014]
According to this invention, the same function and effect as the first aspect of the invention can be obtained.
[0015]
According to a fourth aspect of the present invention, in the third aspect of the present invention, the external power supply circuit is provided with display means for displaying that power is supplied to the relay device. .
[0016]
According to the present invention, by visually recognizing the display on the display means, it is possible to confirm whether or not the power from the external power supply circuit is normally supplied to the relay device.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is an explanatory side view showing an embodiment of the overall configuration of the image forming apparatus according to the present invention. In this embodiment, the digital copying machine 1 is used as an image forming apparatus. As shown in FIG. 1, the digital copying machine 1 includes a paper feed mechanism 10 disposed at the bottom of a box-shaped casing (body) 2, and a paper transport mechanism 20 disposed above the paper feed mechanism 10. And an image forming mechanism 30 disposed above the paper transport mechanism 20, a fixing device 40 disposed on the discharge side of the image forming mechanism 30, and an image forming mechanism 30 and a fixing device 40. The apparatus includes an image reading device (scanner) 50 and an exposure device 33 disposed above, and a control device 60 for controlling the operation of the entire copying machine.
[0018]
The paper feed mechanism 10 includes a paper feed cassette 11 for storing a stack of stacked transfer papers P1, a paper feed roller 12 provided above an outlet of the paper feed cassette 11 and having an arc-shaped outer peripheral portion, and a bundle of transfer papers P1. A coil spring 13 for pushing up the sheet feeding roller 12 side, and a separating claw 15 provided at each of the upper ends in the width direction of the sheet feeding cassette 11 are provided. A plurality of types of paper feed cassettes 11 are prepared according to the size of the transfer paper P1. In the present embodiment, four types of paper feed cassettes 11 for A4 size paper, A3 size paper, B5 size paper, and B4 size paper are used.
[0019]
Further, the paper feeding mechanism 10 has a manual feed tray 11 ′ protruding outside from a casing of the apparatus separately from a paper feeding cassette 11 provided inside the apparatus. The manual feed tray 11 'is configured to be flexible so that the original paper P2 having the same size as the original paper P2 can be loaded in accordance with the size of the original paper P2. The manual feed tray 11 ′ has a paper feed roller similar to that provided in the paper feed cassette 11, and has a front end facing a transport roller pair 22 described later.
[0020]
When the paper feed roller 12 is rotated in a predetermined direction, the arc-shaped outer peripheral portion abuts on the uppermost transfer sheet P1, and the transfer operation feeds the transfer sheet P1 rightward in FIG. At this time, the sheet bundle of the transfer sheets P1 is separated by the separating claw 15, and only the transfer sheet P1 located at the uppermost position is reliably supplied to the sheet transport mechanism 20 one by one.
[0021]
The paper transport mechanism 20 transports the transfer paper P1 whose transport direction is reversed by the reversing guide 21 to the left side in FIG. 1, and a reversing guide 21 for reversing the transport direction of the transfer paper P1 supplied from the paper feed mechanism 10. And a pair of registration rollers for aligning the leading ends of the conveyed transfer paper P1 in the width direction and timing the start of transfer of the toner image in accordance with the rotation of the photosensitive drum 31 described later. 23, a transfer guide 27 for accurately transporting the transfer sheet P1 from the pair of registration rollers 23 to a transfer position where the photosensitive drum 31 and the transfer device 35 face each other, and fixing the transfer sheet P1 having the toner image transferred to the surface. A transfer guide 24 for conveying the sheet to the apparatus 40 and a transfer sheet on which the toner image has been fixed by the fixing device 40 and the image has been formed on the discharge tray 2. A pair of discharge rollers 25 for discharging the above, is constituted by a resist switch 28 provided above the roller concentric with the registration roller pair 23.
[0022]
The registration switch 28 detects that the transfer sheet P1 has been supplied to the registration roller pair 23. Based on the detection result, the registration switch 28 performs the following timing control while synchronizing with the subsequent movement of the transfer sheet P1. The image reading device 50, the image forming mechanism 30, and the fixing device 40, which will be described in detail later, are driven.
[0023]
The registration roller pair 23 stops its rotation until the transfer paper P1 sent by the conveyance roller pair 22 reaches. When the leading end of the transfer paper P1 comes into contact with the registration roller pair 23, distortion during conveyance is caused. Is corrected, and the leading ends in the width direction are aligned. The distance between the exposure position on the outer peripheral surface of the photosensitive drum 31 and the transfer position of the toner image and the distance from the registration roller pair 23 to the transfer position are set to be substantially equal. When the leading ends of the transfer sheets P1 are aligned in the width direction, the driving of the registration roller pair 23 and the exposure of the surface of the photosensitive drum 31 by the exposure device 33 are started almost simultaneously. Since the leading end of the toner image formed on the photosensitive drum 31 and the leading end of the transfer sheet P1 conveyed by the registration roller pair 23 reach the transfer position almost simultaneously, the toner image is transferred onto the transfer sheet P1 with almost no gap. Is done.
[0024]
The image forming mechanism 30 forms a predetermined toner image on the transfer sheet P1 by an electrophotographic process. The image forming mechanism 30 is rotatably supported on a photosensitive drum 31 coated with a photoconductive substance on the surface of the drum. A photoconductor drum driving device 38 for rotating the photoconductor drum 31 in a predetermined direction at a predetermined speed; and a charging device 32 for applying a predetermined potential to the surface of the photoconductor drum 31 (to uniformly charge a predetermined charge). An exposure device 33 for forming an electrostatic latent image on the surface of the photosensitive drum 31 by selectively exposing the surface of the photosensitive drum 31 in accordance with the image of the original paper P2; A developing device 34 for developing an electrostatic latent image formed on the surface of the photosensitive drum 31 by selectively attaching toner to the surface, and a developing device 34 for transferring the developed toner image on the photosensitive drum 31 A transfer device 35 for transferring to the surface of P1, a cleaner 36 for removing (cleaning) toner remaining on the surface of the photosensitive drum 31, and a charge removing device 37 for removing charge on the surface of the photosensitive drum 31; And a charge elimination brush 39 for removing the charge on the transfer sheet after the transfer of the toner image.
[0025]
The charging device 32 is provided on the upstream side in the rotation direction of the photosensitive drum 31 with respect to an exposure position described later, so as to face the surface of the photosensitive drum 31 at a predetermined distance, and is provided with a high voltage. And a grid to which a predetermined voltage (for example, +850 V) is applied, and a predetermined potential is applied to the surface of the photosensitive drum 31 by the wire and the grid.
[0026]
The exposure device 33 includes a laser oscillator 331, a polygon mirror 332 that is a rotating polyhedron for reflecting the laser beam output from the laser oscillator 331, and a lens mirror 332 for correcting distortion of the laser beam reflected by the polygon mirror 332. lens 334 and a mirror 333 for re-reflecting the light reflected by the polygon mirror 332 to the exposure position of the photosensitive drum 31. The laser oscillator 331 outputs a laser beam based on image data of a document read by an image reading device 50 described later. The polygon mirror 332 rotates in a predetermined direction at a constant speed, and changes the angle of the mirror surface that reflects the laser beam output from the laser oscillator 331, so that the laser beam is shifted in the width direction of the photosensitive drum 31. It is designed to scan.
[0027]
The photosensitive drum 31 is formed by coating a film of a photoconductive material such as an organic photoconductor (OPC) material on an outer peripheral surface of a drum such as aluminum, for example. A positive (+) charge is applied so as to be a constant surface potential (for example, +800 V). In this state, when the surface of the photosensitive drum 31 is selectively exposed by the exposure device 33, the potential of the exposed portion decreases due to the photoelectric effect of the photoconductive material applied to the surface. That is, an electrostatic latent image is formed on the surface of the photosensitive drum 31.
[0028]
The developing device 34 is provided on the downstream side in the rotation direction of the photosensitive drum 31 with respect to the exposure position so as to face the surface of the photosensitive drum 31 at a predetermined distance, and supplies a predetermined amount of toner. In addition to holding the toner, the toner is charged to, for example, a positive charge. When the portion of the electrostatic latent image formed on the surface of the photosensitive drum 31 approaches the developing device 34, toner adheres to the surface of the photosensitive drum 31 from the developing device 34, thereby causing the toner to adhere on the surface of the photosensitive drum 31. An image is formed (ie, the electrostatic latent image is developed).
[0029]
The transfer device 35 faces the surface of the photosensitive drum 31 at a predetermined distance so that a gap is still formed even when the transfer paper P1 is transported between the photosensitive drum 31 and the transfer device 35. The transfer current having a polarity opposite to that of the surface potential of the photosensitive drum 31 is applied so that toner adheres to the transfer paper P1 interposed between the photosensitive drum 31 and the transfer device 35. Has become. This adhesion causes the toner image on the surface of the photosensitive drum 31 to be transferred to the transfer sheet P1.
[0030]
The cleaner 36 is provided so as to be in contact with the surface of the photoconductor drum 31, and the toner remaining on the surface of the photoconductor drum 31 even after the transfer device 35 transfers the toner image to the transfer paper P <b> 1. Is to be removed.
[0031]
The static eliminator 37 is provided downstream of the cleaner 36 in the rotation direction of the photosensitive drum 31 and upstream of the charger 32, and the charge remaining on the surface of the photosensitive drum 31. Is to be removed.
[0032]
The fixing device 40 heats and presses the transfer sheet P1 onto which the toner image has been transferred by the image forming mechanism 30 with the heating roller 41 and the pressure roller 42, and fixes the toner image on the transfer sheet P1. Things. The heating roller 41 is provided with a heater 43 made of an electric heating element such as a nichrome wire, and the heating roller 41 is heated by supplying commercial power to the heater 43.
[0033]
The image reading device 50 includes a contact glass 51 also serving as a document table, an exposure lamp 52 for illuminating a document surface of a document sheet P2 placed on the contact glass 51 from inside, and an image of the document sheet P2 as a subject. An imaging lens 57 for forming an image on a photoelectric conversion element 56 such as a CCD line sensor, and mirrors 53, 54 and 55 for refracting and reflecting the optical axis of the imaging lens 57 connecting the original paper P2 and the photoelectric conversion element 56. In order to scan the original paper P2 on the contact glass 51 from the left end to the right end in FIG. 1, the exposure lamp 52 and the mirror 53 and the mirrors 54 and 55 are moved so that the moving speed is 2: 1. And a scanning mechanism (not shown) for moving the inside 58.
[0034]
An image of an area of a fixed width illuminated by the exposure lamp 52 of the original paper P2 placed on the contact glass 51 is formed on the photoelectric conversion element 56 by the imaging lens 57, and both are optically formed. Is a conjugate relationship. When the scanning mechanism starts the scanning of the exposure lamp 52 and the mirror 53 at the first speed from the left end to the right end in FIG. 1, at the same time, the optical path length from the original paper P2 to the photoelectric conversion element 56 is kept constant. The mirrors 54 and 55 are integrally scanned at the second speed, which is half the first speed, from the left end to the right end in FIG. As a result, the entire surface of the original sheet P2 placed on the contact glass 51 can be scanned, and an image on the entire surface of the original sheet P2 can be read.
[0035]
FIG. 2 is an explanatory diagram showing an embodiment of the circuit configuration in the case where the viewpoint of the short circuit inspection of the wiring in the casing 2 of the digital copying machine 1 as described above is considered. As shown in the figure, a primary circuit 3 including a heater 43 and other devices 44 for heating a heating roller 41 by obtaining electric power of, for example, 100 volts from a commercial power supply, and a primary circuit 3 in the casing 2. A secondary circuit 4 that opens and closes the relay device 6 and exchanges signals with the device 44 in the operation control of the heater 43 inside is provided.
[0036]
A lead wire 3a is drawn out of the primary circuit 3 through the casing 2, and a pair of connection terminals 3c of a connection plug 3b provided at the end of the lead wire 3a is inserted into an outlet of a commercial power supply (not shown). , Power is supplied to the primary circuit 3. The primary circuit 3 is provided with a relay device 6 that performs a switching operation for supplying and interrupting power to the heater 43 and the driving device 44.
[0037]
The secondary circuit 4 functions by being supplied with electric power from the primary circuit 3 via an electric component 4b such as a rectifier (not shown). The secondary circuit 4 has a control circuit 4a including a control device 60 for transmitting and receiving signals to and from the device 44 and controlling the digital copying machine 1.
[0038]
The relay device 6 includes two pairs of fixed contacts 61 formed at the divided opposite ends of the main wiring for supplying power to the primary circuit 3, and a pair of movable contacts disposed opposite to the two pairs of fixed contacts 61. The control circuit 4a includes a contact 62 and a relay coil 63 that opens and closes the main wiring by moving the moving contact 62 to and away from the two pairs of fixed contacts 61 by demagnetization and excitation. The power is supplied to the primary circuit 3 by the contact of the moving contact 62 to each fixed contact 61 by the signal being supplied to the relay coil 63, while the fixed contact of the moving contact 62 by the absence of the control signal. The power supply to the primary circuit 3 is cut off by the separation from 61.
[0039]
Such a relay device 6 is provided for the following reason. That is, an opening / closing door (not shown) is provided at the front of the casing 2 for replacing the sheet cassette 11 and for maintenance and inspection of the inside of the casing 2. Since the heating roller 41 is in a state facing the opening, the power supply to the heater 43 is interrupted to stop the heating of the heating roller 41. For this purpose, a sensor (not shown) for detecting that the opening / closing door has been opened is provided at an appropriate position in the casing 2, and this sensor detects the opening of the opening / closing door, thereby controlling the control circuit 4a toward the relay coil 63. The output of the signal is stopped, and the power supply to the primary circuit 3 is interrupted by the separation of the moving contact 62 from the fixed contact 61.
[0040]
Then, whether or not such a primary circuit 3 is short-circuited to the casing 2 is inspected by the withstand voltage inspection device 7 before the digital copying machine 1 is shipped. Such an inspection is performed because, during the wiring work of the primary circuit 3 in the manufacturing process of the digital copying machine 1, the wiring is caught between various metal members fixed to the casing 2, thereby forming the wiring. Since the coating may be damaged and the primary circuit 3 may be short-circuited to the casing 2 due to the damage of the coating, such a disadvantage is to be checked before shipment.
[0041]
The withstand voltage tester 7 applies a high voltage (approximately 1000 volts in the present embodiment) to the wiring of the primary circuit 3 and the casing 2 and determines whether a current flows through a predetermined circuit in the withstand voltage tester 7. It is to detect. As a result of the inspection, when the current is not detected, the lamp of “OK” is turned on and it is determined that the insulation is good. On the other hand, when the current is detected, the lamp of “NO” is turned on and there is a faulty insulation. It is determined and sent back to the manufacturing process.
[0042]
The withstand voltage tester 7 is provided with a pair of lead wires 71 for testing, and a test terminal 72 made of a clip or the like is attached to the tip of each lead wire 71, and one of the test terminals 72 is connected. A high voltage from the withstand voltage tester 7 is applied to the casing 2 and the primary circuit 3 by being connected to the pair of connection terminals 3c of the plug 3b and connecting the other inspection terminal 72 to the other connection terminal 3c. I'm trying to get.
[0043]
Further, an ammeter 73 is provided in the withstand voltage tester 7 to display a current value when a short-circuit portion exists between the casing 2 and the primary circuit 3. By visually recognizing the display of the current value, the degree of the short circuit can be determined.
[0044]
When the digital copier 1 is inspected for a short circuit in the manufacturing process, electric power for operating the digital copier 1 is not supplied to the primary circuit 3, so that power is obtained from the primary circuit 3. The control signal from the control circuit 4 a is not supplied to the relay coil 63 of the relay device 6. Accordingly, since the movable contact 62 is open with respect to the fixed contact 61, even if a high voltage from the pressure-resistant tester 7 is applied to the casing 2 and the primary circuit 3, one of the test terminals 72 is connected. Only between the connected connection terminal 3c and the fixed contact 61 of the relay device 6 provided at the distal end of the wiring connected to the connection terminal 3c, whether or not there is a short circuit between the primary circuit 3 and the casing 2 is determined. It is only possible to detect, and it is not possible to check whether the entire primary circuit 3 is short-circuited.
[0045]
Therefore, conventionally, the movable contact 62 of the relay device 6 is forcibly pressed toward the fixed contact 61 by using a predetermined jig, whereby the pair of movable contacts 62 are forcibly contacted with the two pairs of fixed contacts 61. Although the high voltage from the withstand voltage tester 7 can be distributed to all the wires of the primary circuit 3 by the present invention, the relay device 6 can be reliably turned on without performing such a troublesome and unreliable operation. The external power supply circuit 8 which can be used is used.
[0046]
The external power supply circuit 8 includes a DC power supply 81, a checker circuit 82 connected in series to the DC power supply 81, a switch 83, and a male plug (connector) 84. The checker circuit 82 determines whether or not a current flows in the external power supply circuit 8, and includes an ammeter 82a in addition to various electric components. The current value detected by the ammeter 82a is displayed on a predetermined display.
[0047]
The male plug 84 connects the external power supply circuit 8 to the relay coil 63 and supplies the electric power of the DC power supply 81 to the relay coil 63. The male plug 84 has a pair of external terminals 84a. 2 is provided with a female plug (connector) 2a corresponding to the male plug 84.
[0048]
The female plug 2a is fixed to the wall surface of the casing 2 from the inside with its connection surface exposed to the outside, and by inserting the external terminal 84a into the connection hole of the female plug 2a, the female terminal 2b of the female plug 2a is inserted. And the external terminal 84a of the male plug 84 are connected to each other, so that the electric power of the DC power supply 81 can be supplied to the relay coil 63.
[0049]
The switch 83 supplies and cuts off the power from the DC power supply 81 to the relay coil 63 by performing an on / off operation while the male plug 84 is connected to the female plug 2a. Therefore, when the switch 83 is turned on while the male plug 84 is connected to the female plug 2a, electric power from the DC power supply 81 is supplied to the relay coil 63, and two pairs of fixed contacts of the pair of movable contacts 62 are excited by this. The contact with 61 causes the entire primary circuit 3 to be in an energizable state.
[0050]
Then, in the present invention, the insulation state of the primary circuit 3 is inspected by using the external power supply circuit 8 as described above. Hereinafter, the inspection method of the present invention will be described. In the test, first, one of the test terminals 72 of the pressure-resistant tester 7 is connected to an appropriate position of the casing 2, and the other of the test terminals 72 is connected to a pair of connection terminals 3 c of the connection plug 3 b of the primary circuit 3. Is done.
[0051]
Next, after the male plug 84 is connected to the female plug 2a, the switch 83 of the external power supply circuit 8 is turned on. In this way, the power of the DC power supply 81 is supplied to the relay coil 63 via the male plug 84 and the female plug 2a, and the excitation of the relay coil 63 causes the moving contact 62 to be connected to the fixed contact 61. It enters the inspection standby state. In this case, by visually checking the detection value of the ammeter 82a of the checker circuit 82, it can be confirmed whether or not power is appropriately supplied to the relay coil 63.
[0052]
Subsequently, the withstand voltage tester 7 is operated to apply a high voltage to the casing 2 and the primary circuit 3 via the lead wire 71 and the test terminal 72. If there is a short circuit between the casing 2 and the primary circuit 3, the ammeter 73 detects the current and the "NO" lamp is turned on. It can be known that such a part is short-circuited to the casing 2. Conversely, when the ammeter 73 does not detect the current and the "OK" lamp is turned on, it can be known that the insulation state of the primary circuit 3 is good.
[0053]
As described in detail above, the present invention is a digital copying machine 1 configured to secure the energized state of the primary circuit 3 by the ON operation of the relay device 6 connected to the secondary circuit 4, Since the female plug 2a is provided in the casing 2 for performing the ON operation of the power supply 6 from the external power supply circuit 8 different from the secondary circuit 4, the female plug 2a on the casing 2 side is provided. Is connected to the male plug 84 of the external power supply circuit 8 to Control signal The relay device 6 can be turned on by the relay device 6 so that the primary circuit 3 in the casing 2 can be energized. Therefore, in this state, one of the pair of test terminals 72 of the withstand voltage tester 7 is connected to the primary circuit. 3 is connected to one connection terminal 3c of the connection plug 3b, and the other inspection terminal 72 is connected to the casing 2 to apply a high voltage, and a current state between the casing 2 and the primary circuit 3 is detected by an ammeter 73. By doing so, the presence or absence of a short circuit between the primary circuit 3 and the casing 2 can be inspected.
[0054]
As described above, since the relay device 6 is operated by the power supply from the external power supply circuit 8, the contact of the relay device 6 is mechanically connected from outside the device using a predetermined jig. As compared with the method described above, the ON operation of the relay device 6 can be performed easily and reliably, and the reliability of the inspection result is improved.
[0055]
Further, since the female plug 2a of the secondary circuit 4 is provided inside the casing 2 so that the connection surface faces the outside, the male plug 84 of the external power supply circuit 8 can be easily connected to the female plug 2a of the casing 2. , Which can contribute to speeding up the inspection.
[0056]
Further, the external power supply circuit 8 is provided with an ammeter 82a for indicating that the power supply to the relay device 6 has been performed. It is possible to confirm whether or not the power from the power supply circuit 8 is normally supplied, and it is possible to always perform a highly reliable inspection.
[0057]
【The invention's effect】
According to the first and third aspects of the present invention, the connector on the external power supply circuit side is connected to the connector on the fuselage side, so that the connection from the secondary circuit side is achieved. Control signal The relay device can be turned on even if there is no power supply, so that the primary circuit inside the machine can be energized. In this state, one of the counter electrodes of a predetermined withstand voltage tester that applies a high voltage is connected to the primary circuit. In addition to the above, it is possible to execute a test for detecting the presence or absence of a short circuit between the primary circuit and the fuselage by connecting the other end to the fuselage and applying a high voltage, and detecting a conduction state between the counter electrodes. it can.
[0058]
As described above, since the relay device is operated by the power supply from the external power supply circuit, the conventional method of mechanically connecting the contacts of the relay device from outside the device using a predetermined jig is used. In comparison, the ON operation of the relay device can be performed easily and reliably, and the inspection result can be made highly reliable.
[0059]
According to the second aspect of the present invention, since the connector on the fuselage side is provided at an appropriate position on the fuselage to which the connector on the external power supply circuit side located outside the fuselage can be connected, the connector on the external power supply circuit side is connected to the fuselage side. Can be easily connected to this connector, which can contribute to speeding up the inspection.
[0060]
According to the fourth aspect of the invention, since the external power supply circuit is provided with the display means for displaying that the power supply to the relay device has been performed, the relay device is visually recognized by the display means. It is possible to confirm whether the power from the external power supply circuit is normally supplied or not, which is effective in obtaining highly reliable inspection results.
[Brief description of the drawings]
FIG. 1 is an explanatory side view showing an embodiment of the entire configuration of an image forming apparatus according to the present invention.
FIG. 2 is an explanatory diagram showing an embodiment of a circuit configuration in a case where attention is paid to inspection for presence / absence of a short circuit in a casing of a digital copying machine;
[Explanation of symbols]
1 digital copier 2 casing
2a Female plug 2b In-machine terminal
3 Primary circuit 3a Lead wire
3b connection plug
3c connection terminal 4a control circuit
4 Secondary circuit 6 Relay device
7 Withstand voltage tester 8 External power supply circuit
10 paper feed mechanism 11 tray
11 Paper cassette 12 Paper roller
13 Coil spring 15 Jaw claw
20 Paper transport mechanism 21 Reverse guide
22 Transport Roller Pair
23 registration roller pair 24 transport guide
25 discharge roller pair 26 discharge tray
27 Transfer Guide
28 Registration switch 30 Image forming mechanism
31 Photoconductor drum 32 Charger
33 Exposure equipment
332 polygon mirror
333 mirror 334 lens
34 developing device 35 transfer device
36 Cleaner 37 Static eliminator
38 Photoconductor drum driving device 39 Static electricity removal brush
40 fixing device 40 fixing device
41 heating roller 42 pressure roller
43 heater 44 drive equipment
50 Image reading device
51 contact glass 52 exposure lamp
53,54 mirror 56 photoelectric conversion element
57 Imaging lens 58 Moving space
60 control device 61 fixed contact
62 Moving contact 63 Relay coil
71 Lead wire 72 Inspection terminal
72 Connection terminal 73 Ammeter
81 DC power supply 82 Checker circuit
82a ammeter 83 switch
84a External terminal 84 Male plug
331 Laser oscillator P1 Transfer paper
P2 manuscript paper

Claims (4)

An electrical component connected to the secondary circuit and configured to ensure the energized state of the primary circuit by an ON operation of a relay device operated by a control signal from the secondary circuit is provided in the airframe. In the image forming apparatus, a connector for turning on the relay device by supplying power from an external power supply circuit different from the secondary circuit is provided. The image forming apparatus according to claim 1, wherein the connector is provided at an appropriate position of the body to which a connector of the external power supply circuit located outside the body can be connected. An electrical component connected to the secondary circuit and configured to ensure the energized state of the primary circuit by an ON operation of a relay device operated by a control signal from the secondary circuit is provided in the airframe. In the inspection method of the image forming apparatus, the on-operation of the relay device may be performed by applying a high voltage while the relay device is turned on by power supply from an external power supply circuit separate from the secondary circuit. One of the counter electrodes of the tester is connected to the primary circuit side, and the other is connected to the fuselage to apply a high voltage and detect the state of conduction between the counter electrodes to connect the primary circuit to the fuselage. An inspection method for an image forming apparatus, comprising: detecting whether a short circuit has occurred. 4. The inspection method for an image forming apparatus according to claim 3, wherein the external power supply circuit includes a display unit for displaying that power is supplied to the relay device.

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