JP3604537B2 - Safety switch device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a safety device used in a copier, a printer, or the like, for example, for detecting the opening and closing of each door that opens and closes for jam (paper jam) processing, and for energizing or interrupting a voltage from a power supply. The present invention relates to a switch device.
[0002]
[Prior art]
As a conventional safety switch device, for example, there is a safety switch device used in a color printer 140 as shown in FIG. In the figure, a color printer 140 includes various motors 142 such as a main motor, a toner motor, and a feed motor, various clutches 144 for transmitting power to rollers such as a feed roller, a registration roller, and an intermediate roller, a cleaning blade, and the like. It has various solenoids 146 for driving the forward and backward movement of the second transfer roller, the developing roller of each color, etc., and various other devices 148 such as a fixing heater, a high bias voltage, a photosensitive laser, and a charge eraser. Is activated by the supply voltage from the power supply 150.
[0003]
That is, various motors 142, various clutches 144, various solenoids 146, and various other devices 148 are connected to the control circuit board 152, and a voltage is supplied from the power supply 150 to the control circuit board 152. Thus, the various components 142, 144, 146, and 148 are controlled and operated by the control circuit of the control circuit board 152.
[0004]
In addition, the color printer 140 is operated by a user to open and close, draw out, etc., in order to replace toner, add paper to a cassette, take out discharged toner, clear a jam, maintain or replace various component units, and the like. A plurality of covers 154 to 156, a paper cassette 157, and the like are provided in each part of the apparatus main body.
[0005]
When these covers 154 to 156 and the paper cassette 157 are movably operated, a dangerous part in the interior may be touched by a user's hand, and an accident such as electric shock or burn may be caused. , The safety switches 161 to 156 corresponding to the covers 154 to 156 and the paper cassette 157, respectively, so that a voltage is not supplied from the power supply 150 to the various components 142, 144, 146, and 148 even if the movable operation is performed. 164 are provided, and the safety switches 161 to 164 are connected in series to a circuit between the power supply 150 and the control circuit board 152.
[0006]
Therefore, only when all the covers 154 to 156 and the paper cassette 157 are in a non-operating state such as closing and all the safety switches 161 to 164 are turned on, the power supply 150 and the control circuit board 152 And the various components 142, 144, 146, and 148 are supplied with a voltage from the power supply 150, and any of the covers 154 to 156 and the paper cassette 157 is opened. Is configured so that the voltage from the power supply 150 is not supplied to the various components 142, 144, 146, and 148.
[0007]
[Problems to be solved by the invention]
However, in such a conventional safety switch device, since a safety switch is provided for each cover and each paper cassette, a large number of safety switches are required, which leads to an increase in the cost of the device and an increase in safety. There is a problem that labor is required for assembling the switches and connecting the wirings thereof, and this leads to a decrease in the assemblability of the entire device.
[0008]
In view of the above problems, an object of the present invention is to provide a safety switch device suitable for reducing the cost of the device and improving the assemblability.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a safety switch device according to the present invention includes:
Three or more movable members movably operated by a user at each part of the device;
A single safety switch provided in the middle of a circuit between each component constituting the device and a power supply for supplying a voltage thereto;
It moves forward or backward according to the operation state of the movable member, and is arranged so that when it moves forward, it is arranged on the operating direction line of the operating tip portion of the safety switch, and the direction at the time of retreating is opposite to the adjacent one. Switching means having a cam member corresponding to each of the movable members,
When all of the movable members are in the non-operation state, all of the cam members advance, and all of the cam members are arranged on the operation direction line of the operation tip portion to press the operation tip portion. Thereby, the safety switch is turned ON to switch to a state where a voltage can be supplied from the power supply to the respective components,
When at least one of the movable members is in a movable operation state, the corresponding cam member is retracted from the operation direction line to remove the force for pressing the operation distal end portion and turn off the safety switch. The operation is switched to a state in which the supply of the voltage from the power supply to each of the components is interrupted.
[0010]
According to the safety switch device having such a configuration, when all of the three or more movable members provided so as to be movable by the user at each part of the device are in a non-operating state, the switching unit switches to a single safety switch. It is turned on to switch to a state in which a voltage from a power supply can be supplied to each component of the apparatus. When at least one of the movable members is in a movable operation state, the switching means turns off the safety switch. In this case, the supply of the voltage is switched to a state in which the supply of the voltage is interrupted. Therefore, the supply and the interruption of the voltage from the power supply can be switched with a single safety switch. For this reason, it is not necessary to provide a large number of safety switches as in the related art, so that the cost of the device can be reduced and the assemblability can be improved.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 to FIG. 13 are views showing a color printer 10 using a safety switch device according to a first embodiment of the present invention.
[0012]
FIG. 1 is a block circuit diagram illustrating a schematic configuration of the color printer 10. The color printer 10 shown in FIG. 1 includes various motors 2 such as a main motor, a toner motor, and a feed motor, various clutches 4 for transmitting power to rollers such as a feed roller, a registration roller, and an intermediate roller, a cleaning blade, and the like. It has various solenoids 6 for driving the forward and backward movement of the second transfer roller, the developing roller of each color, etc., and various other devices 8 such as a fixing heater, a high-voltage bias voltage, a photosensitive laser, and a charging eraser. Is activated by the supply voltage from the power supply 20.
[0013]
That is, various motors 2, various clutches 4, various solenoids 6, and various other devices 8 are connected to the control circuit board 12, and a voltage is supplied from the power supply 20 to the control circuit board 12. The various components 2, 4, 6, and 8 are controlled and operated by the control circuit of the control circuit board 12.
[0014]
In addition, the color printer 10 is operated by the user to open and close, draw out, etc., in order to replace toner, add paper to a cassette, take out discharged toner, clear a jam, and maintain or replace various component units. A plurality of covers (movable members) 14 to 16 and a paper cassette (movable member) 17 are provided in each part of the apparatus main body (see FIG. 2).
[0015]
If the user performs a movable operation such as opening or pulling out the covers 14 to 16 or the paper cassette 17, the user's hand may touch a dangerous part inside and cause an accident such as electric shock or burn. Even when the cover or paper cassette is opened or pulled out, a voltage is not supplied from the power supply 20 to the various components 2, 4, 6, and 8 so that a voltage cannot be supplied from the power supply 20 to the circuit between the control circuit board 12 and the power supply 20. A single safety switch 21 is provided.
[0016]
Then, between each of the covers 14 to 16 and the paper cassette 17 shown in FIG. 2 and the internal safety switch 21, only when all the covers 14 to 16 and the paper cassette 17 are closed (in a non-operation state). A switching mechanism (switching means) 25 for turning on the safety switch 21 is provided (see FIG. 1).
[0017]
The switching mechanism 25 has four cam members 27 to 30 as shown in FIGS. 3 and 4, and these cam members 27 to 30 support members 32 as shown in FIGS. 5 to 7. Is rotatably supported on the distal end portion 32a. The support member 32 is slidably mounted on a stopper 36 fixed to a substrate 34 (see FIGS. 3 and 4), and is provided so as to be reciprocable in its length direction.
[0018]
That is, as shown in FIG. 7, a compression spring 38 is provided between the rear end portion 32b of the support member 32 and the stopper 36, and the support member 32 is opposed to the spring force of the compression spring 38 on the right side in FIG. When the support member 32 moves forward (to the front end portion 32a) or when the opposing force is removed, the support member 32 retreats to the left side (toward the rear end portion 32b) in FIG.
[0019]
Of the four cam members 27 to 30 in FIGS. 3 and 4, the three cam members 27 to 29 are rotatably provided on the distal end portion 32a of the support member 32 as described above. Only one cam member 30 is fixedly provided on the front end portion 32a of the support member 32 so as not to rotate.
[0020]
The three cam members 27 to 29 are urged by a spring (not shown) provided on the distal end portion 32a of the support member 32 to always rotate in a direction away from the operating distal end portion 21a of the safety switch 21. However, the projections 27a, 28a, and 29a of the three cam members 27 to 29 on the opposite side to the rotation pin 31 are locked by the locking portions 32c of the support member 32 and do not rotate more than a certain amount. It has become.
[0021]
As shown in FIGS. 3 and 4, the rear ends 32b of the four support members 32 that support the cam members 27 to 30 are connected to the covers 14 to 16 and the paper cassette 17 of the color printer 10 as shown in FIG. The mechanical movement is provided by a mechanical transmission mechanism M provided between the two.
For example, the relationship between the opening and closing movement of the cover 16 and the movement of the cam member 28 will be described below with reference to FIG.
[0022]
As shown in FIG. 9, when the cover 16 is closed, the distal end of the transmission rod 40 that has been projected to the outside of the main body wall 42 by the compression spring 44 is pressed by the cover 16, and the transmission rod Reference numeral 40 moves to the right (in the direction of the arrow) in the figure. A rack 40a is formed at the right end of the transmission rod 40 in the figure, and a pinion 46 meshes with the rack 40a. The pinion 46 also meshes with a rack 48 a formed at the upper end of a transmission rod 48 extending in a direction perpendicular to the transmission rod 40.
[0023]
Therefore, when the transmission rod 40 moves to the right in the drawing as described above, the transmission rod 48 moves downward (in the direction of the arrow) through the pinion 46. Then, the lower end of the transmission rod 48 in the figure moves the support member 32 of the cam member 28 so as to advance the cam member 28 against the compression spring 38.
[0024]
Similarly, the other covers 14 and 15 or the paper cassette 17 are moved via the mechanical transmission mechanism M to move the support member 32 when they are closed, and to move the cam member 27 against the compression spring 38. , 30 and 29 are mechanically transmitted to advance their closing motion.
[0025]
FIGS. 3 and 4 show the state of the switching mechanism 25 when the covers 14 to 16 and the paper cassette 17 are all closed. In this state, all the cam members 27 to 30 move forward and are aligned on the operating direction line of the operating tip 21a of the safety switch 21, so that the operating tips oppose the springs (not shown) inside the safety switch 21. By pushing the unit 21a into the inside of the safety switch 21, the safety switch 21 is turned on, and the power supply 20 and the control circuit board 12 shown in FIG. A voltage from a power supply 20 can be supplied to various clutches 4, various solenoids 6, and various other devices 8.
[0026]
When the cover 14 is opened, as shown in FIG. 10, the support member 32 supporting the cam member 27 is urged by the compression spring 38 and retreats leftward in the figure. Then, as shown in FIG. 4, the cam member 27 which has been arranged so as to contact the side of the cam member 28 with its own side and presses the operating tip 21a of the safety switch 21 is in that state. The cam member 27 is urged by a spring (not shown) to rotate in a direction away from the safety switch 21.
[0027]
For this reason, the operating tip portion 21a which has been pressed and retracted into the safety switch 21 can be urged by the spring in the safety switch 21 to protrude downward in the drawing, whereby the safety switch 21 When the cover 14 is turned off and the cover 14 is opened, it is possible to prevent the user from being exposed to danger.
[0028]
When the cover 16 is opened, the support member 32 supporting the cam member 28 is retracted rightward in the figure by the compression spring 38 as shown in FIG. Then, as shown in FIG. 4, the cam member 28, which was sandwiched between the side portions of the cam member 27 and the side portion of the cam member 29 so as to contact both sides thereof, becomes Then, the tip of the cam member 28 rotates in a direction away from the safety switch 21 by a spring (not shown).
[0029]
For this reason, the cam member 27 loses its support and its tip also rotates in a direction away from the safety switch 21, so that the operating tip 21 a which has been retracted into the safety switch 21 until then becomes in the safety switch 21. It can be urged by a spring and can project downward in the drawing, whereby the safety switch 21 is turned off and the user can be prevented from being exposed to danger when the cover 16 is opened.
[0030]
When the paper cassette 17 is opened, as shown in FIG. 12, the support member 32 supporting the cam member 29 is retracted leftward in the figure by the compression spring 38. Then, as shown in FIG. 4, the cam member 29, which has been sandwiched between the side portions of the cam member 28 and the side portion of the cam member 30 so as to contact both sides thereof, as shown in FIG. Then, the tip of the cam member 29 is rotated in a direction away from the safety switch 21 by a spring (not shown).
[0031]
For this reason, the cam members 27 and 28 lose their support, and both of the tip portions rotate in a direction away from the safety switch 21, so that the operating tip portion 21 a which has been retracted into the safety switch 21 until then is moved to the safety switch 21. The spring in the switch 21 can be urged to protrude downward in the drawing, thereby turning off the safety switch 21 and preventing the user from being in danger by opening the paper cassette 17. be able to.
[0032]
When the cover 15 is opened, as shown in FIG. 13, the support member 32 supporting the cam member 30 retreats rightward in the figure. Then, as shown in FIG. 4, the cam member 30 that has been arranged so that the side of the cam member 29 and the side of the cam member 29 are in contact with each other is separated from the side of the cam member 29.
[0033]
For this reason, the cam members 27 to 29 lose their support and their tips rotate in a direction away from the safety switch 21, so that the operating tip 21 a that has been retracted into the safety switch 21 until then is moved to the safety switch 21. The safety switch 21 is turned off by being biased by the inner spring, thereby preventing the user from being exposed to danger by opening the cover 15. .
[0034]
In the above embodiment, the case where the safety switch device of the present invention is used for a color printer has been described. However, the safety switch device of the present invention does not need to be limited to a color printer, and other devices may be used. It is also possible to apply to.
[0035]
As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments, and various other changes can be made based on the technical idea of the present invention. .
[0036]
【The invention's effect】
As described above, according to the present invention, when all of three or more movable members provided so as to be movable by the user in each part of the device are in the non-operating state, the switching means switches to a single safety switch. It is turned on to switch to a state in which a voltage from a power supply can be supplied to each component of the apparatus. When at least one of the movable members is in a movable operation state, the switching means turns off the safety switch. In this case, the supply of the voltage is switched to a state in which the supply of the voltage is interrupted. Therefore, the supply and the interruption of the voltage from the power supply can be switched with a single safety switch. For this reason, it is not necessary to provide a large number of safety switches as in the related art, so that it is possible to reduce the cost of the apparatus and improve the assemblability.
[Brief description of the drawings]
FIG. 1 is a block circuit diagram of a color printer 10 using a safety switch device according to a first embodiment of the present invention.
FIG. 2 is an external perspective view of the color printer 10.
3 is a perspective view of a safety switch 21 and a switching mechanism 25. FIG.
4 is a plan view of a safety switch 21 and a switching mechanism 25. FIG.
FIG. 5 is a perspective view of a support member 32 that supports the cam members 27 to 29.
FIG. 6 is a plan view of a support member 32 that supports the cam members 27 to 29.
FIG. 7 is a partially cutaway side view of a support member 32 that supports the cam members 27 to 29.
FIG. 8 is a perspective view of the color printer 10 without the cover 14 on the near side so that the switching mechanism 25 can be seen.
FIG. 9 is a detailed view of a mechanical transmission mechanism M that drives a support member 32 of the switching mechanism 25.
FIG. 10 is a plan view showing one mode of operation of the switching mechanism 25.
11 is a plan view showing one mode of operation of the switching mechanism 25. FIG.
FIG. 12 is a plan view showing one mode of operation of the switching mechanism 25.
FIG. 13 is a plan view showing one mode of operation of the switching mechanism 25.
FIG. 14 is a block circuit diagram of a color printer 140 showing a conventional safety switch device.
[Explanation of symbols]
2 Various motors 4 Various clutches 6 Various solenoids 8 Various other devices 10 Color printers 12 Control circuit boards 14 to 16 Covers 17 Paper cassettes 20 Power supply 21 Safety switches 21 a Operating tips 25 Switching mechanisms 27 to 30 Cam members 27 a , 28a, 29a Projection 31 Rotating pin 32 Support member 32a Tip 32b Rear end 32c Lock 34 Board 36 Stopper 38,44 Compression spring 40,48 Transmission rod 40a, 48a Rack 42 Body wall 46 Pinion 140 Collar Printer 142 Various motors 144 Various clutches 146 Various solenoids 148 Various other devices 152 Control circuit boards 154 to 156 Covers 157 Paper cassettes 150 Power supplies 161 to 164 Safety switches M Mechanical transmission mechanism

Claims (6)

Three or more movable members movably operated by a user at each part of the device;
A single safety switch provided in the middle of a circuit between each component constituting the device and a power supply for supplying a voltage thereto;
It moves forward or backward according to the operation state of the movable member, and is arranged so that when it moves forward, it is arranged on the operating direction line of the operating tip portion of the safety switch, and the direction at the time of retreating is opposite to the adjacent one. Switching means having a cam member corresponding to each of the movable members,
When all of the movable members are in the non-operation state, all of the cam members advance, and all of the cam members are arranged on the operation direction line of the operation tip portion to press the operation tip portion. Thereby, the safety switch is turned ON to switch to a state where a voltage can be supplied from the power supply to the respective components,
When at least one of the movable members is in a movable operation state, the corresponding cam member is retracted from the operation direction line to remove the force for pressing the operation distal end portion and turn off the safety switch. By operating, the state is switched to a state in which the supply of the voltage from the power supply to each of the components is cut off.
Safety switch device, characterized in that. Among the cam members, a predetermined cam member farthest from the operating tip is non-rotatably mounted to a support member that slides in the front-rear direction,
Each of the other cam members other than the predetermined cam member in the cam member is rotatably mounted on a support member that slides in the front-rear direction, and is separated from the operating tip by a spring. The safety switch device according to claim 1, wherein the safety switch device is biased so as to rotate in a direction away from the safety switch. A mechanical transmission mechanism is provided between the movable member and the cam member,
When the movable member is in a non-operating state, the cam member advances through the mechanical transmission mechanism,
Safety switching device according to claim 1 or claim 2 when said movable member is a movable operating state, wherein the cam member via the mechanical transmission mechanism is retracted. Three or more movable members movably operated by a user at each part of the device;
A single safety switch provided in the middle of a circuit between each component constituting the device and a power supply for supplying a voltage thereto;
It has a plurality of identical support members that move forward or backward in accordance with the operation state of each of the movable members, and among the plurality of support members, turn to the support member farthest from the operating tip of the safety switch. A switching means in which an immovable first cam member is mounted, and a rotatable second cam member having substantially the same shape and being rotatable with each other is mounted on another supporting member;
When all of the movable members are in the non-operating state, the switching means moves all of the first and second cam members forward and moves the first and second cam members on the operation direction line of the operation front end. The safety switch is turned on by pressing all the members side by side at the operating tip, and the components are switched to a state where a voltage can be supplied from the power supply to each of the components.
When at least one of the movable members is in a movable operation state, one of the corresponding first or second cam members is retracted from the operating direction line and presses the operating tip. The safety switch is turned off by removing the force of the power supply, so that the supply of the voltage from the power supply to each of the components is switched to a state in which the supply of the voltage is cut off.
A safety switch device characterized by the above. Each of the first and second cam members is arranged so that the directions of the operation tip portions when retracted from the operation direction line are opposite to each other, The safety switch device according to claim 4, wherein each of the second cam members is biased by a spring so as to rotate in a direction away from the operating tip. A mechanical transmission mechanism is provided between the movable member and each of the first and second cam members,
When the movable member is in the non-operating state, one of the corresponding first or second cam members advances through the mechanical transmission mechanism,
When the movable member is in a movable operation state, one of the corresponding first or second cam members retreats via the mechanical transmission mechanism.
The safety switch device according to claim 4 or 5, wherein

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