JP4079588B2 - Power supply device and image forming apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to an electric circuit opening / closing method, a power supply device that implements the method, and an image forming apparatus incorporating the same.
[0002]
[Prior art]
  Japanese Patent Laid-Open No. 5-216305 omits harnesses for electrical connection between an electrical unit and an image formation-related functional unit in order to increase the reliability of the transmission section, and the electrical circuit board of each unit. An image forming apparatus is disclosed in which circuit boards are electrically connected directly to each other with a connector provided in the above.
[0003]
  When a relatively high power feed path is turned on and off, high level switching noise is likely to be radiated. Therefore, the power supply device includes an electric circuit that suppresses the emission of switching noise and the outflow through the electric circuit, and a shielding plate, and measures are taken so that the power supply device does not become a noise source.
[0004]
  However, in electrical equipment that is relatively bulky, it is often necessary to place a power switch or an interlock switch at a location away from the power supply device, and to connect these switches and the power supply device with electrical leads, so-called harnesses. . For example, in a printer or copying machine, a power switch is arranged at a relatively high position that is easy for an operator to operate, and the power supply device is housed in the lower part. In addition, a plurality of open / close covers are arranged on the front and side of the device for exchanging consumables, inspection, cleaning, or paper jam removal. When the cover is opened, for example, an electric circuit that supplies power to the drive circuit of the image exposure laser An interlock switch inserted in the door is opened (electrical circuit cut off) to ensure the safety of the user. In this case, if the interlock switch is arranged near the opening / closing cover, the switch operating mechanism can be easily designed.
[0005]
[Problems to be solved by the invention]
  However, if the harness wiring between the power switch and the electrical switch such as the power switch or the interlock switch becomes long, it is considered that the harness radiates the switching noise, and the countermeasure for blocking this becomes difficult.
[0006]
  The first object of the present invention is to avoid radiation of switching noise. A second object is to eliminate the need for remote placement of electrical switches. A third object is to eliminate the harness for connecting the electrical switch.
[0007]
[Means for Solving the Problems]
  (1) An electric switch (25) for opening and closing an electric circuit on the circuit board, mounted on the circuit board (10) to which the power circuit element (PSC) is assembled, in the power supply device disposed in the equipment casing; Drives the open / close switch (25a)One endPart(26c / 43)And a cooperating member (26/26) extending toward the front surface of the device casing outside the circuit board.40,49, 51); AndotherAssembled to the end of the device housingpluralCover (7, 9)MultipleReceiving member (34a, 36a/ 52, 53),And the electric switch when the plurality of receiving members are pressed simultaneously. (twenty five) When the force applied to the receiving member disappears, the force applied to the receiving member is reduced to reduce the force applied to the receiving member. (twenty five) AND mechanism that allows movement of the cooperating member to a position where it returns to the open position (30 ~ 38/40 ~ 45) ;A power supply apparatus comprising:
[0008]
  In addition, in order to make an understanding easy, the code | symbol of the corresponding element of the Example shown in drawing and mentioned later is added to the parenthesis for reference. The same applies to the following.
[0009]
  According to this, the equipment housingpluralCover (7, 9) Is closed to drive the electrical switch (25) through the linkage member. The electrical switch (25) is mounted on the circuit board (10) with the power circuit elements assembled, that is, the circuit board of the power supply device. Can be sufficiently suppressed. Since no harness is used, there is no noise emission from the harness. Instead of the harness, it is only necessary to place the linking member near the front of the equipment housing, and the receiving member operated for switch switching ispluralCover (7, 9) In the closed position.
[0010]
  For example, in an embodiment in which the interlock switch of the power supply circuit is opened by opening each of the plurality of opening / closing covers, when one opening / closing cover is opened, the pushing force applied to the logical product mechanism disappears, and the electrical switch closing operation of the logical product mechanism The power is lost and the electrical switch opens. That is, it is turned off. When all the opening / closing covers are closed, the logical product mechanism applies a closing driving force to the electric switch, and the electric switch is closed. That is, it is turned on. There is no need to provide a set of electrical switches for each open / close cover.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
  (2) Further comprising a metal bracket (17) that supports the circuit board (10), and the bracket (17) includes the cooperation member (26) of the device casing.coverSupported by allowing movement toward the surface, above (1) Power supply.
[0012]
  According to this, the bracket (17) shields the noise radiated from the circuit board (10). Since the bracket (17) is shared for supporting the link member (26), it is not necessary to add a link member support.
[0013]
  (3) The linkage member (26) is supported on the main edge of the bracket (17) so as to be able to reciprocate along the one edge, and then bent to contact the open / close switching operator (25a) of the electric switch (25). A synthetic resin rod having a portion (26c) projecting to a contact positionThe power supply device according to (2) above.
[0014]
  According to this, it is not necessary to set the installation space of the linkage member (26) to be particularly wide, and there are few obstacles in the reciprocation of the linkage member (26), and the linkage member (26) can be easily installed. By using the synthetic resin rod, there is no leakage or inductive coupling to the power supply circuit element, and the linkage member (26) can be easily assembled.
[0015]
  (4) The outer end of the circuit board (10) of the linkage member (26);AND mechanism (30 ~ 38)The above (with a buffer spring (27) inserted between3) Power supply described. Cooperation member (26)AND mechanism (30 ~ 38)The movement range of theAND mechanism (30 ~ 38)For example, when the linkage member (26) reaches the movement limit position,AND mechanism (30 ~ 38)Continues to push further, the linkage member (26) and / orAND mechanism (30 ~ 38)However, the buffer spring (27) absorbs such force, so that the coupling member (26) andAND mechanism (30 ~ 38)Will not be deformed.
[0016]
  (5)The linkage member (40,49,51) SaidDrives the open / close switch (25a) of the electrical switch (25)Base frame (40) And a flexible sheathed wire connected thereto (49,51) And the receiving member (52,53) Is driven by a closing movement of a plurality of covers of the device casing to drive the wire.Power supply.With sheathWire(49,51)For example, since the orientation can be changed by 90 degrees, for example, it is easy to turn around the equipment and the degree of freedom of arrangement is high.
[0017]
  (6) The electrical switch is an interlock switch (25). According to this, in the power supply device, for example, when the front cover of the equipment housing is opened, the interlock switch (25) is inserted into the electrical path that should be shut off for safety, and this is connected to the equipment housing via the linkage member.pluralOperated by cover,OneWhen the cover is opened, the interlock switch (25) in the power supply device can be turned off.
[0018]
  (7)SaidOpen and close the electric circuit on the circuit board equipped on the circuit board (10)Main powerThe switch (11) has an end for driving the switch opening / closing switching element (11a) and extends toward the front surface of the device casing outside the circuit board.LinkingA member (13), which can be moved to two positions and stays there when driven to one position, and stays there when driven to the other position;LinkingHaving an operation button (12a) coupled to the member (13);As described in (6) abovePower supply.
[0019]
  According to this, when the user operates the operation button (12a) in the same manner as an operation for turning on and off a normal power switch,Main powerSwitch (11) can be turned on and off.Main powerThe electrical switch (11) is mounted on the circuit board (10) with the power supply circuit elements assembled, that is, the circuit board of the power supply device. Can be sufficiently suppressed. Since no harness is used, there is no noise emission from the harness. Instead of the harness, the link member (13) may be arranged near the front of the device casing, and the operation button (12a) operated for switch switching can be easily installed on the front of the device casing.
[0020]
  (8)LinkingThe member (13) is a thin rod (13) whose one end is engaged with the operation button.7) Power supply.
[0021]
  According to this, in the power supplymainConnect the power switch (11) to the front of theOperationIt can be turned on and off by operating the small-diameter bar (13) via the operation button (12a).
[0022]
  (9An image forming apparatus comprising the power supply device according to any one of (1) to (8) above.
[0023]
  (10)The plurality of covers of the device casing is a front cover. (7) And side cover (9) Including the above (9)Image forming apparatus.
[0024]
  According to this,Front cover (7) And side cover (9)Each open of the power circuit interlock switch(twenty five)In the mode of opening, when one open / close cover is opened, the pushing force to the logical product mechanism disappears, and the electrical switch closing operation force of the logical product mechanism disappears,interlockSwitch (25) turns off. When all the open / close covers are closed, the AND mechanism generates the closing drive force.interlockIn addition to the switch (25)interlockSwitch (25) is turned on. There is no need to provide a set of interlock switches for each open / close cover.
[0025]
  (11) The logical product mechanism(30 ~ 38)IsCooperation member (26) The member that drives (30) , The memberWith the end (36b) for drivingHornA rotating blade (36) having an end (36a) pushed by closing the cover (7) and capable of rotating around a pin (35) between the ends, and supporting the pin, When the other cover (9) is closed, the rotating blade (36) is moved around the fixed shaft (33).Driving member (30)Including bracket (34) that pivots in a direction approaching(9) or (10)Image forming apparatus.
[0026]
  oneOneWhen the cover (7) is closed, the rotating blade (36) rotates,one moreThe position of the end (36b) of the rotating blade (36) when the bracket (34) is rotated by closing the cover (9) is the driven position where the member (30) is driven. When one of the covers (7, 9) is open and the other is closed and only one of the rotating blade (36) and the bracket (34) rotates, the end (36b) of the rotating blade (36) The position is the position immediately before driving the member (30), both the two covers (7, 9) are open, and both the rotating blade (36) and the bracket (34) are in the retracted position. The position of the end (36b) of the rotating blade (36) is the retracted position. That is, the end portion (36b) of the rotating blade (36) depends on the combination of opening and closing of the two covers (7, 9).
                        Both covers open: retracted position,
                          Only one side is closed:
                        Both covers are closed: Driven position,
When the end (36b) of the rotating blade (36) moves from the position immediately before driving to the driven position, that is, both the covers (7, 9) are closed. Then, the end (36b) pushes and drives the member (30), and the electric switch (25) is switched from OFF to ON. When at least one cover is opened, the end portion (36b) returns from the driven position to the position just before driving, thereby eliminating the pressing force on the member (30) and turning the electric switch (25) from on to off. Switch.
[0027]
  This AND mechanism(30 ~ 38)Therefore, the drive member (30) can be driven strongly with a relatively large stroke based on the principle of the lever using the pin as a fulcrum. The reliability of the interlock operation of the electric switch (25) is high.
[0028]
  Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.
[0029]
【Example】
  -1st Example-
  FIG. 1A shows the appearance of an electrophotographic full-color printer PTR equipped with an embodiment of the present invention, and FIG. The color printer PTR is an electrophotographic laser scanning color printer that prints out print data as image information when given from a host such as a personal computer (PC). , A paper feeding device, a double-sided paper feeding device, and a printer controller.
[0030]
  The closing lids 1 and 2 on the upper surface of the printer PTR close the receiving holes for receiving the lower legs of the scanner. When this printer PTR is upgraded to a multi-function digital color copier, the lower leg of the manuscript scanner equipped with a copier operation board and optionally equipped with an ADF (automatic document feeder) is shown in FIG. Then, it is inserted into the receiving hole covered with the closing lids 1 and 2 and fixed to the machine frame of the printer with bolts.
[0031]
  The laser scanner in the printer PTR is supplied with image data separated into color components of Bk (black), Y (yellow), M (magenta), and C (shear) for each color unit. Each color unit is one image forming unit. At the time of monochromatic recording, image data of one of the four colors is given to the laser scanner. The photoreceptor is driven to rotate at a constant speed, charged by the main charger, and the charged position is adjusted to an appropriate potential by a quenching lamp. The laser scanner scans and projects the laser modulated by the image data on the charging surface. Thereby, an electrostatic latent image corresponding to the image data is formed on the photoreceptor. This electrostatic latent image is developed by a developing device (Bk) having a developing toner of a color corresponding to an image formation designated color (for example, Bk) of a rotational positioning type developing device, and a visible image, that is, a toner image, Become. The toner image is transferred to a transfer belt by a transfer charger and transferred to a transfer paper fed by a registration roller by a transfer separation charger, and the transfer paper carrying the toner image is conveyed. The belt is fed into the fixing device. The transfer paper is fed out from the first tray 3 that can store A4 or smaller size paper or the second tray 4 that can store A3 or smaller size paper to the paper feeding device.
[0032]
  The fixing device fixes the toner image on the transfer paper to the transfer paper by heating and pressing. After the fixing, the transfer sheet is discharged onto a discharge receiving surface 5 which is the upper surface of the printer PTR. The surface of the photoreceptor after the toner image has been transferred is cleaned by a cleaning device. The surface of the transfer belt that has been transferred is wiped with a cleaning blade. In color overprinting of two or more colors (most typical is full color recording), the above-described toner image formation on the photoreceptor and transfer onto the transfer belt are repeated for each color. Each color toner image is transferred on the transfer belt in a superimposed manner, and transferred to the transfer paper after completing the overlapping transfer for the required colors.
[0033]
  Inside the printer PTR, directly below the operation panel 6 are a printer controller and an engine controller, below which there is a laser scanner, below which there is a photosensitive member, a visual imager and other image forming mechanisms.
[0034]
  The printer controller includes a CPU that is a main processor, an ASIC (Application Specific IC) that performs system bus control and image processing, a ROM that stores CPU control programs, an NVRAM that can retain data even when the power is turned off, and a host Data received from a PC is stored temporarily via an IEEE 1284 Centro I / F, and image data created based on the received data is stored in a DRAM (image memory), image data representing a character shape is stored, A font ROM that converts character data into image data at the time of formation, an operation panel I / F that controls / communications the operation panel 6, a scanner I / F, an engine I / F that communicates with the engine controller and transmits image data; IE capable of compliant with IEEE1284 EE1284-I / F.
[0035]
  When the original scanner is mounted as described above, an image data processing device for correcting or editing read image data, which is built in the scanner, is connected to the scanner I / F in the printer controller.
[0036]
  The front cover 7 can be opened by a hinge at the lower end of the front cover 7 by turning it forward (arrow A1), that is, around the horizontal y-axis. When the front cover 7 is opened, the side end portion of the image forming mechanism described above is exposed. The first tray 3 and the second tray 4 can be pulled out in the direction opposite to the arrow in the horizontal x direction, that is, the front front direction.
[0037]
  On the left side surface of the printer PTR, there is a fixing paper receiving tray 8 that guides the fixing paper discharged in the horizontal y direction vertically upward at a position facing the discharge side peripheral surface of the fixing roller of the fixing device. In the usage mode in which the sheet is discharged in the y direction, the receiving base 8 is opened around the horizontal x axis of the hinge at the lower end thereof, and one end of an optional sheet discharge tray (not shown) is inserted into the opened opening so Combined with When using the sorter, the cradle 8 is also opened, and the transfer paper receiving port of the sorter (not shown) is connected to the opening that appears.
[0038]
  When the cradle 8 is closed as shown in FIG. 1A, the transfer paper delivered from the fixing device is guided vertically upward by the cradle 8 and is fed upward by the vertical transport device to receive the paper discharge. Sent to surface 5. The paper discharge cover 9 that supports the idle belt and the roller for pressing the paper, which forms a part of the vertical transport device, is rotated in the sideways direction (arrow A2), that is, around the horizontal x-axis by the hinge at the lower end. Can be opened. When the paper discharge cover 9 is opened, the drive belt and rollers on the paper feed drive side of the vertical transport unit are exposed.
[0039]
  When a paper trouble such as a paper jam occurs in the image forming mechanism, or when replenishing toner, replacing consumable parts, checking, cleaning, etc., the front cover 7 is opened in the forward direction A1. When there is a paper trouble such as a paper jam in the vertical conveyance after fixing, the paper discharge cover 9 is laid down and opened in the direction A2.
[0040]
  Inside the left side plate of the printer PTR is a power supply unit PSU, and on the circuit board 10 is a main power switch 11. The operation button 11 a of the main power switch 11 is connected to a power operation device 12 on the left side of the first tray 3 by a thin rod 13. A mechanical AND mechanism MAN extends upward from the upper end on the front side of the circuit board 10.
[0041]
  2A shows the left side of the printer PTR, and FIG. 2B shows the right side of the printer PTR. 14 on the right side shown in FIG. 2 (b) is a manual feed table. The manual feed table 14 is opened around the x axis of the hinge at the lower end thereof, and can be manually fed from there. Below the manual feed base 14 is a cover 15 for closing the paper jam inspection opening. By opening the cover sideways around the x-axis of the hinge at the lower end, the cover 15 is unwound from the trays 3 and 4 and is fed by the paper feed mechanism. You can check whether the transfer paper to be fed is jammed. Further, below the cover 15, there is a cover 16 that closes an opening for mounting an optional paper feeding bank for mass feeding. The cover 16 is removed when a large-size paper feed bank is installed.
[0042]
  FIG. 3 shows the power supply unit PSU. The power supply unit PSU is obtained by fixing a printed circuit board 10 equipped with various power supply circuits PSC to a steel bracket 17. A connector frame 22 fitted with power supply connectors 18 to 20 and a power reception connector 21 is fixed to the substrate 10. The power receiving connector 21 receives a commercial AC power supply connector (not shown) and receives commercial AC power. The commercial AC power receiving connector 21 is connected to an AC input circuit on the substrate 10 with an electrical lead. The power feeding connectors 18 to 20 are connected to power feeding conductors of the DC output circuit on the substrate 10 by electric leads. Connected to the power supply connectors 18 to 20 are load-side connectors (not shown) for supplying power to the electrical loads of the image forming mechanism, paper feed mechanism, fixing device and paper discharge mechanism, and optional document scanner and automatic document feeder. .
[0043]
  The main power switch 11 fixed to the printed circuit board 10 is toggled from the OFF position to the ON position and vice versa when the user presses with a finger. A base 11b with which the tip of the small-diameter bar 13 engages is integrally formed with an operation button 11a that performs a reversal of the direction), and a small diameter is formed in a hole penetrating in the vertical direction z of the base 11b. The tip of the rod 13 is inserted. The thin rod 13 extends in the horizontal x direction. When the small-diameter bar 13 is driven in the direction of the arrow x, the main power switch 11 is switched from the OFF state shown in FIG. 3 to the ON state.
[0044]
  The printed circuit board 10 has normally open type interlock switches 23, 24 and 25, which respectively supply electric motor energization circuits, laser energization circuits for image forming exposure, and high voltage circuits for charging and transfer. Is inserted. These interlock switches 23, 24 and 25 are arranged in the x direction. When the operation rod 26 slidably supported in the x direction at the upper edge of the bracket 17 is driven in the x arrow direction, the operation rod 26, the downward branches 26a, 26b and 26c push the operating elements 23a, 24a and 25a of the switches 23, 24 and 25, and the interlock switches 23, 24 and 25 are closed from the normal open state. Switch to (Contact). Each interlock switch 23, 24 and 25 has a built-in return spring, and when the pushing force applied to the operation rod 26 is lost, it acts on the operation elements 23a, 24a and 25a of each interlock switch 23, 24 and 25. Due to the return spring force, the operating elements 23a, 24a and 25a push back the operating rod 26, and the interlock switches 23, 24 and 25 are returned to the normal open state.
[0045]
  The outline of the shape of the operating rod 26 is a quadrangular bar shape, but the tip portion that receives the operating force is a round bar shape or a pin shape, and is inserted into one end of the compression coil spring 27. The compression coil spring 27 is a buffer spring having a spring force slightly stronger than the total repulsive force of the operating elements 23a, 24a and 25a by the return springs of the interlock switches 23, 24 and 25.
[0046]
  4A shows the surface of the steel bracket 17, FIG. 4B shows its right side, and FIG. 4C shows its left side. See also FIG. The bracket 17 is formed by press punching to form a large number of substrate support legs or arms, through holes, and support tongues. The operation rod 26 has a flat surface on the back surface (x, z plane) of the bracket 17. 17a, the upper surface (x, y surface) is a bent edge 17b standing upright from the flat plate, the front surface (front surface; x, z surface) is a vertical tongue piece 17c bent further at a right angle from the bent edge 17b, and The lower surface (x, y plane) is supported or guided by a horizontal tongue piece 17d raised at a right angle from the flat surface 17a.
[0047]
  FIG. 5 shows the front of the printed circuit board 10. On the printed circuit board 10, not only each part of the printer PTR shown in FIG. 1A but also several kinds of voltages and capacities for supplying power to all other devices such as an original scanner, which are supposed to be added as an option. There are several types of power circuits. Most of the power supply circuits are turned off when the main power switch 11 is turned off. However, some circuits are provided with a memory circuit and a memory control electronic circuit for holding data in a non-volatile state even when the main power switch 11 is turned off. Weak power supply to When the main power switch 11 is ON, all the power supply circuits can output power when in the print operation mode, but when the energy saving standby condition is satisfied, other than the power supply circuit that automatically supplies power to the command monitoring controller, A power supply circuit that consumes a relatively large amount of standby power is shut off by operating the relay circuit. The normally open interlock switches 23, 24 and 25 inserted in the power supply path to the electric motor drive circuit, the laser drive circuit for image forming exposure and the high voltage circuit for charging, transfer, etc. are printed by the printer PTR. In either the mode or the energy saving standby mode, when the front cover 7 or the paper discharge cover 9 is opened and the pushing of the operating rod 26 in the direction of the arrow x weakens, the operating rod 26 is pushed back to open the switch. Thus, the power supply path to the electric motor drive circuit, the laser drive circuit for image formation exposure and the high voltage circuit such as charging and transfer is cut off.
[0048]
  FIG. 6 shows the connection of the main power switch 11 and the power controller 12 by the operation rod 26. The power controller 12 is a power switch that toggles from the OFF position to the ON position and vice versa when the user presses it with a finger, and deletes the electrical contacts and contacts, and also operates the operation button 12a. The lower leg 12b penetrating the bottom wall of the switch outer casing is integrally formed. Through the hole penetrating in the y direction at the tip of the lower leg 12b, the tip of the small-diameter bar 13 bent at a right angle in the direction opposite to the arrow y direction passes through.
[0049]
  In the state shown in FIG. 6, the main power switch 11 is OFF (disconnected). In this state, when the user presses the protruding end of the operation button 12a of the power operation device 12, that is, the upper end close to the ON display with a finger, the return spring of the toggle mechanism inside the operation device 12 is compressed, and the operation button 12a is When the rotation rotates counterclockwise around the y axis and the rotation exceeds the dead point, the return spring in the operation device 12 is forced to rotate the operation button 12a in the rotation direction by the pressing of the user. Instead, the operation button 12a rapidly rotates counterclockwise, that is, toggles, the upper end on the ON display side of the operation button 12a sinks, and the lower end on the OFF display side protrudes. In this process, the lower leg 12b of the operation button 12a is moved in the direction of the arrow x, whereby the small-diameter bar 13 is simultaneously moved in the same direction, and the operation button 11a of the main power switch 11 is moved from the OFF posture shown in FIG. Switching to the ON position, the main power switch 11 is switched from OFF to ON (contact). This switching is also a toggle operation.
[0050]
  When the main power switch 11 is turned on in this way, the lower end on the OFF display side of the operation button 12a of the power operation device 12 protrudes. When the user presses the lower end with a finger, the toggle display causes the lower end on the OFF display side of the operation button 12a to sink and the upper end on the ON display side to protrude. In this process, the lower leg 12b of the operation button 12a moves in the direction opposite to the x arrow direction, whereby the small-diameter bar 13 simultaneously moves in the same direction, and the operation button 11a of the main power switch 11 is moved from the ON position. The main power switch 11 is switched from ON to OFF by switching to the OFF posture shown in FIG.
[0051]
  FIG. 7 shows the operation rod 26. 7A shows the front, FIG. 7B shows the top, and FIG. 7C shows the back. The operation rod 26 is made of a synthetic resin. In addition to the branches 26a, 26b, and 26c for operating the interlock switches 23, 24, and 25, the operation rod 26 is supported by the bracket 17 so as to be slidable in the x direction with a reliable and low sliding resistance. There are overhangs 26e, 26f and 26g for the purpose.
[0052]
  The back surfaces (x, z surfaces) of the overhangs 26e, 26f, and 26g are supported in contact with the flat plate-like surface 17a (FIGS. 3 and 4) of the bracket 17, but this is because the overhang exists locally in the x direction. The sliding resistance against the x-direction slide due to the support is small. The upward movement of the operating rod 26 is caused by the top surfaces of the ridges (three for each overhang) extending in the y direction on the upper surfaces (x, y surfaces) of the overhangs 26e, 26f and 26g hit the bent edge 17b of the bracket 17. Although regulated, the ridge extends in the y direction and the slide is in the x direction, so that the sliding resistance of the ridge against the slide in the x direction is small.
[0053]
  The forward movement (movement in the y direction) of the operation rod 26 is restricted by the two tongue pieces 17c, and the width of the tongue piece 17c in the x direction is narrow. small. Furthermore, although the operating rod 26 is supported by the three tongue pieces 17c below, since the width of the tongue piece 17d in the x direction is narrow, the sliding resistance of the tongue pieces 17d against the slide in the x direction is small. In this way, the vertical and vertical (z) and forward / backward (y) movement of the operating rod 26 is restricted, and the sliding resistance in the x direction is reduced to ensure the support of the operating rod 26, and the x moving load is lightened. is doing.
[0054]
  FIG. 8 shows an outline of main elements of the mechanical logical product mechanism MAN. A pin 29 fixed to the link arm 30 is coupled to the buffer spring 27 coupled to the operation rod 26. The link arm 30 is rotatable around a pin 31 that extends in the y direction and is fixed to a fixed bracket 32 (FIG. 9). Above the pin 31, there is a rotating bracket 34 that is supported by a pin 33 that is fixed in the z direction and that can rotate around the pin 33. A pin 35 is fixed to the rotating bracket 34. A substantially Z-shaped rotating blade 36 is supported by the pin 35 so as to be rotatable.
[0055]
  FIG. 9 shows a fixing bracket 32 that supports the fixing pin 31 and a linkage lever 38 that is rotatably coupled thereto. (A) shows a plane, (b) shows the front. The cooperation lever 38 is supported by a pin 37 extending in the x direction so as to be rotatable about the pin 37. The cooperation lever 38 is pushed by the movement of the paper discharge cover 9 from opening to closing, and rotates clockwise around the pin 37 ((b) in FIG. 9).
[0056]
  In FIG. 10, the rotation bracket 34 and the rotation blade | wing 36 assembled | attached to it are shown. (A) shows a plane, (b) shows the front. Here, please refer to FIGS. 8 and 9 again. When the pivot bracket 34 (FIG. 8) is in a posture in which the receiving surface 34a is orthogonal to the movement direction A3 of the discharge cover 9 from opening to closing, the action protrusion 38a of the linkage lever 38 is When moving from open to closed, it advances in the direction of the arrow A3 and hits the receiving surface 34a of the rotating bracket 34, which is pushed in the direction of the arrow A3.
[0057]
  As a result, the pivot bracket 34 pivots clockwise in FIG. 8 around the pin 33, whereby the pin 35 and the pivot blade 36 supported thereby move from the retracted position to the operating position, The action receiving surface 36a of the rotating blade 36 is in a posture orthogonal to the movement direction A4 (FIG. 8) of the interlock operator (not shown) of the front cover 7 from opening to closing of the front cover 7. When the front cover 7 is closed from the open state in this state, an interlock operator (not shown) of the front cover 7 advances in the arrow A4 direction and pushes the receiving surface 36a of the rotating blade 36 in the arrow A4 direction. As a result, the rotating blade 36 rotates clockwise around the pin 35 in FIG. 8, and the pushing surface 36b of the rotating blade 36 hits the upper limb 30a of the link arm 30 and pushes it in the direction opposite to the arrow x. The link arm 30 is driven to rotate clockwise in FIG. 8 about the pin 31. As a result, the lower limb 30b (the pin 29) of the link arm 30 moves in the x arrow direction, and drives the buffer spring 27 in the arrow direction.
[0058]
  Referring now also to FIG. 3, the spring force of the buffer spring 27 is inside the interlock switches 23, 24 and 25, and the repulsive force of the return spring that gives the operating elements 23a, 24a and 25a a force in the opening direction. Since the buffer spring 27 pushes the operating rod 26 and moves in the x arrow direction, the branches 26a, 26b and 26c of the operating rod 26 push the operating elements 23a, 24a and 25a in the x arrow direction. The lock switches 23, 24 and 25 are switched from normal OFF to ON.
[0059]
  That is, when both the paper discharge cover 9 and the front cover 7 are closed as shown in FIG. 1, the interlock switches 23, 24 and 25 are ON. When the front cover 7 is opened in the state where all the covers are closed, for example, the detent that has been stopped by pushing the rotary vane 36 shown in FIG. 8 in the direction of the arrow A4 is lost, so that the return springs of the interlock switches 23, 24, and 25 are removed. With this force, the operating elements 23a, 24a and 25a push the operating rod 26 back in the direction opposite to the x arrow direction, and the interlock switches 23, 24 and 25 are switched from ON to OFF. At this time, since the paper discharge cover 9 is closed, the return bracket of the rotation bracket 34 is stopped by the paper discharge cover 9 via the linkage lever 38 and does not rotate.
[0060]
  When the paper discharge cover 9 is opened instead of the front cover 7 when all the covers are closed, the return rotation of the rotary blade 36 is prevented by stopping the front cover 7 in the arrow 7 direction (FIG. 8). However, since the rotation of the rotation bracket 34 in the direction of the arrow A3 is not stopped, the rotation bracket 34 can be rotated together with the rotation blade 36 counterclockwise around the pin 33 in FIG. Thus, with the force of the return springs of the interlock switches 23, 24 and 25, the operating elements 23a, 24a and 25a push back the operating rod 26 in the direction opposite to the x arrow direction, and the interlock switches 23, 24 and 25 are Switch from ON to OFF.
[0061]
  As described above, the normally open type interlock switches 23, 24 and 25 are switched from OFF to ON when the front cover 7 and the paper discharge cover 9 are both closed. When at least one of them is opened, it is switched from ON to OFF.
[0062]
  -Second Example-
  FIG. 11 shows a main part of the second embodiment different from the first embodiment. In this second embodiment, only one normally open type interlock switch 25 is used, and when both the front cover 7 and the paper discharge cover 9 are closed, the interlock switch 25 is turned ON, and the front cover 7 and the paper discharge The interlock switch 25 is turned off when at least one of the covers 9 is opened. As a mechanical AND element, a base frame 40 having a long hole 41 in the x direction and capable of rotating with respect to a fixing pin 42 penetrating in the y direction and sliding in the x direction was used. . A protrusion 43 for pressing the base frame 40 is fixed to the surface of the base frame 40 facing the operation element 25a.
[0063]
  Two pins 44 and 45 are fixed to the base frame 40. These pins 44 and 45 and the fixing pin 42 are located at the corner of an isosceles triangle, and the fixing pin 42 is located at the apex. The distal ends of flexible and highly elastic steel wires 49 and 51, which are the core wires of the sheathed wires 46 and 47, are locked to the two pins, respectively. These core wires 49 and 51 penetrate Teflon tubes or sheath tubes 48 and 50, which are flexible and slippery synthetic resins. The sheathed wire 46 is arranged so that the contact button 52 fixed to the tail end of the core wire 49 is arranged at a position pushed by closing the front cover 7, and the sheath tube end on the button 52 side is not shown. It is fixed to the printer frame by a stopper. The other end of the sheath tube 48 is fixed to a stop base 54, and the stop base 54 is fixed to the printed circuit board 10 to which the interlock switch 25 is fixed.
[0064]
  The sheathed wire 47 is arranged so that a contact button 53 fixed to the tail end of the core wire 51 is arranged at a position to be pushed by closing the paper discharge cover 9, and the sheath tube end on the button 53 side is illustrated. It is fixed to the printer frame by a non-stopper. The other end of the sheath tube 50 is fixed to a stop base 54.
[0065]
  When both the front cover 7 and the discharge cover 9 are open, the protrusion 25a is pushed by the operating element 25a in the direction opposite to the x arrow direction, and the base frame 40 pushes the wires 49 and 51 in this direction. Thus, the contact button 52 protrudes to a position where the striker of the cover 7 strikes when the front cover 7 is closed, and similarly, the contact button 53 also protrudes to a position where the striker of the cover 9 contacts when the discharge cover 9 is closed. For example, when only the paper discharge cover 9 is closed in this state, the contact button 53 is pushed down by the striker of the cover 9, and the wire 51 slides in the sheath tube 47 in the direction of moving the pin 45 in the x direction. Although the lower end advances in the x direction, the advancement of the protrusion 43 is stopped by the operation element 25a, so that the base frame 40 rotates clockwise around the pin 45. That is, the upper end of the base frame 40 escapes in the direction opposite to the x arrow direction.
[0066]
  When the discharge cover 9 is closed and the front cover 7 is further closed, the abutment button 52 is pushed down by the striker of the front cover 7, and the wire 49 passes through the sheath tube 48 and the pin 44 in the x direction. The upper end of the base frame 40 moves forward in the x direction. At this time, the lower end of the base frame 40 cannot move in the direction opposite to the x direction (the movement of the wire 51 is stopped by the paper discharge cover 9). It rotates counterclockwise around its lower end. Thereby, the protrusion 25a pushes down the operation element 25a, and the interlock switch 25 is switched from OFF to ON.
[0067]
  When the switch 25 is turned on, that is, when both the front cover 7 and the paper discharge cover 9 are closed, the base frame 40 is rotated clockwise when the front cover 7 is opened, and the base frame is opened when the paper discharge cover 9 is opened. 40 rotates counterclockwise, the protrusion 43 moves in the direction opposite to the x arrow direction, and the interlock switch 25 is switched OFF.
[0068]
  In the second embodiment, the sheathed wires 46 and 47 can be curved to change the direction by 90 degrees, for example, so that the wiring can be somewhat close to the electrical lead, so that the position and posture of the power supply device or the interlock switch can be freely set. High degree.
[0069]
  In the second embodiment, the main power switch 11 and the power operation unit 12 are connected with a similar sheathed wire in the form that the thin rod 13 in FIG. 6 is replaced with a wire. In the embodiment using the sheathed wire, the power controller 12 may not be the same height as the main power switch 11 and can be disposed at a position higher or lower than the main power switch 11. That is, the z position can be shifted with respect to the main power switch 11. In addition, the y position can be shifted with respect to the main power switch 11. That is, it can be shifted in the horizontal direction y.
[Brief description of the drawings]
FIG. 1A is a perspective view showing an external appearance of an electrophotographic full-color printer PTR equipped with a power supply device according to a first embodiment of the present invention, and FIG. 1B is a front view.
2A is a left side view of the printer PTR shown in FIG. 1A, and FIG. 2B is a right side view thereof.
FIG. 3 is an enlarged perspective view of the power supply unit PSU shown in FIG. 1;
4A is a front view of the bracket 17 shown in FIG. 3, FIG. 4B is a right side view, and FIG. 4C is a left side view.
FIG. 5 is a plan view showing the surface of the printed circuit board 10 shown in FIG. 3;
6 is a perspective view showing a combination of the main power switch 11, the power controller 12 and the thin rod 13 shown in FIG.
7 is an enlarged view of the operating rod 26 shown in FIG. 3, wherein (a) is a front view, (b) is a plan view, and (c) is a rear view.
FIG. 8 is an enlarged perspective view showing a part of the logical product mechanism MAN shown in FIG. 1;
9A is a plan view showing a part of the AND mechanism MAN shown in FIG. 1, and FIG. 9B is a front view.
10A is a plan view showing a part of the AND mechanism MAN shown in FIG. 1, and FIG. 10B is a front view.
FIG. 11 is a perspective view showing a main part of a second embodiment of the present invention.
[Explanation of symbols]
PTR: Printer PSU: Power supply
1, 2: Closed lid 3, 4: Tray
5: Paper receiving surface 6: Operation panel
7: Front cover 8: Receiving base
9: Paper discharge cover 10: Circuit board
11: Main power switch 11a: Operation button
11b: seat 12: power controller
12a: Operation button 12b: Lower leg
13: Small rod 14: Manual feed table
15, 16: Cover 17: Bracket
17a: flat surface 17b: bent edge
17c: vertical tongue 17d: horizontal tongue
18-21: Connector 22: Frame
23-25: Interlock switch
23a to 25a: operation elements
26: Operation rod 26a to 26c: Branch
27: Buffer spring 29: Pin
30: Link arm 30a: Upper limb
30b: Lower limb 31: Pin
32: Fixing bracket 33: Pin
34: Rotating bracket 34a: Receiving surface
35: Pin 36: Rotating blade
36a: receiving surface 36b: pushing surface
37: Pin 38: Cooperation lever
38a: action protrusion 40: base frame
41: Long hole 42: Fixing pin
43: Projection 44, 45: Pin
46, 47: Wire with sheath
48, 50: sheath tube 49, 51: steel wire
52, 53: Button 54: Stop base

Claims (11)

In the power supply device disposed in the device housing, and mounted on the circuit board assembly the power circuitry, electrical switch to open and close the circuit of the circuit board; you drive the opening and closing switching operator of the electric switch end It has a section, the extension building cooperative member to the outside of the circuit board; and, said linkage member mounted on the other end the apparatus housing a plurality of cover several receiving members that will be driven by the closing movement of, and When the plurality of receiving members are simultaneously pressed, a force for closing the electric switch is applied to the receiving member, and when the pressing to at least one receiving member disappears, the force to the receiving member is decreased. A power supply device comprising : a logical product mechanism that allows the cooperation member to move to a position where the electrical switch returns to an open position . 2. The power supply device according to claim 1, further comprising: a metal bracket that supports the circuit board, wherein the bracket supports the cooperation member while allowing movement toward a cover surface of the device housing. The linkage member is a synthetic resin rod having a main body supported so as to be reciprocally movable along one edge of the bracket, and a portion which is bent and protrudes to a position where it comes into contact with an opening / closing switching element of the electric switch The power supply device according to claim 2, wherein The power supply device according to claim 3 , wherein a buffer spring is interposed between an end portion of the cooperation member outside the circuit board and the logical product mechanism. The linkage member includes a base frame that drives an opening / closing switching operation element of the electric switch and a flexible sheathed wire, and the receiving member is moved by closing movement of a plurality of covers of the device casing. The power supply device according to claim 1, wherein the power supply device is driven to drive the wire . The power supply device according to claim 1 , wherein the electrical switch is an interlock switch. Equipped on the circuit board, a main power switch for opening and closing the circuit of the circuit board has an end portion that drives the opening and closing switching operator of the switch, toward the front of the apparatus housing to the outside of the circuit board connecting members extending Te, and, when driven in one position a mobile friendly to the 2 position stays there, remain there when driven in the other position, the coupling is mounted on the front surface of the apparatus housing The power supply device according to claim 6, further comprising an operation button coupled to the member. The power supply device according to claim 7, wherein the connecting member is a thin rod having one end engaged with the operation button. An image forming apparatus comprising the power supply device according to claim 1 . The image forming apparatus according to claim 9, wherein the plurality of covers of the device housing includes a front cover and a side cover . The logical mechanism is pivoted to the central member for driving cooperation member has an end portion which is pushed by the end portion and the closed one of the cover to drive the member pins located between their ends rotating blades that may, and supports the pin, about a fixed shaft is pushed by the closing of another cover comprises a bracket which rotates in a direction to approach the member to the driven rotating blade, billed Item 11. The image forming apparatus according to Item 9 or 10 .

Images