JPH0517727Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a display device, and more particularly to a display device that is assembled into a copying machine, a facsimile machine, a game machine, etc., and displays the operating frequency.

[Conventional technology]

Traditionally, digital mechanical counters have been installed as display devices in copying machines to display the number of copies, facsimiles to display the number of transmissions and receptions, and amusement machines to display the number of operations. There is.

Figure 10 shows a conventional digital mechanical counter, in which a plurality of rotating bodies 21 (three in the figure, but usually four or more) with numbers from 1 to 0 displayed on the outer circumferential surface are arranged on the same axis. The rotating body 2 is rotatably supported on the shaft 22, and the rotating body 2 is supported on the shaft 23, which is mounted parallel to the shaft 22.
1, and a carry gear 24 is rotatably supported. And the rotating body 2 of each digit
An engaging portion 21a for rotationally driving the gear 24 is formed on the upper digit side side surface of 1, and an engaging portion 21 that engages with the gear 24 is formed on the entire lower digit side side surface.
It forms b. Furthermore, the rotating body 2 of the lowest digit
1 has a small diameter gear 21c instead of the engaging portion 21b.
By engaging with a pawl body 25 that is integrally formed and is reciprocated by a predetermined angle (swings in arrow directions A and B in FIG. 4) by a solenoid (not shown),
It is designed to be rotated intermittently by 1/10 rotation. In addition, the carry gear 24 has an engaging portion 2 on the lower digit side.
An engaging claw 24a that engages with the upper digit 1a is formed, and an engaging claw 24b that engages with the engaging portion 21b is formed on the upper digit side.

Therefore, each time the solenoid operates, the claw body 2
5 first swings in the direction of arrow A, and then swings in the direction of arrow B by means of a spring (not shown) that returns the drive shaft of the solenoid, thereby rotating the lowest rotating body 21 by 1/2.
By rotating it ten times, the number visible from the display window (not shown) can be increased by one. Then, when the display by the lowest rotating body changes from 9 to 0, the engaging portion 2 of the lowest rotating body 21
1a engages with the engagement claw 24a of the carry gear 24 to rotate the gear 24 by a predetermined angle, and the engagement claw 24b of the gear 24 engages with the engagement portion 21b of the rotating body 21 of the upper digit.
By engaging with and turning 1/10, the display changes to 1.
increase only.

From then on, operate in the same way and rotate the upper digits in order,
A numerical value with a number of digits determined by the number of rotating bodies 21 can be displayed.

[Problem that the invention attempts to solve]

However, in such a digital mechanical counter, the driving force from the solenoid is transmitted purely mechanically, and as the numerical value increases, the number of rotors 21 to be rotated and the number of gears 24 increase, so unless the driving force from the solenoid is large, it is not possible to display the required numerical value. Therefore, as the number of display digits increases, it becomes necessary to use a larger solenoid, which results in an increase in the overall size and complexity of the structure, which is also a cause of increased costs.

In addition, in cases where there is a risk of missing important information if the parts are not replaced before the end of their service life, such as the transfer drums of laser printers that have recently become used in facsimile machines, etc. It is necessary to reliably detect that a component has reached a certain frequency of use, and it is inconvenient to use a device that simply displays a count like the above-mentioned conventional example.

[Means for solving problems]

The present invention was developed in consideration of the above-mentioned circumstances, and has a simple structure, can be made smaller as a whole, can achieve cost reduction, and has the ability to reduce the number of parts that are used at a certain level. The purpose is to provide a display device that can transmit this information to the outside, and has a worm gear that rotates integrally with a driven gear that is intermittently driven to rotate by the driving force from a drive source, and is stationary. A large-diameter gear rotatably supporting a first planetary gear that meshes with the attached first ring gear is rotatably mounted in a state of meshing with the worm gear, and the large-diameter gear is
A second planetary gear is attached on the opposite side to the first planetary gear support surface and rotates integrally with the first planetary gear, and the second planetary gear is attached so as to be rotatable concentrically with the large diameter gear and has teeth with the first ring gear. The gist of the present invention is to provide a display device that is meshed with a different number of second ring gears and has a built-in switch that is activated when the amount of rotation of the second ring gear reaches a predetermined amount.

[Effect of invention]

In the display device according to the present invention, a driven gear is driven by a signal indicating that a part has been used once, and a large diameter gear is rotated by a worm gear that rotates integrally with this driven gear. Among the planetary gears that are supported to rotate integrally in A second ring gear having a different number of teeth than the ring gear is rotated. Then, when the second ring gear rotates by a predetermined angle, the conductive movable contact piece that comes into elastic contact with the surface of the second ring gear or a member that rotates together with the second ring gear connects with other conductive contact pieces installed inside. Connecting.

〔Example〕

Next, one embodiment of the present invention will be explained with reference to FIGS. 1 to 3.

In the figure, 1a and 1b are a pair of upper and lower casings, and 2 is a component mounting base material housed in the casings 1a and 1b. At predetermined positions on the component mounting base material 2 are a solenoid 3, a driven gear 4 and a worm gear 5 that rotate integrally with each other, a first ring gear 6 that is fixedly attached, a large diameter gear 7 that meshes with the worm gear 5, and a large diameter gear. A second ring gear 8 is attached which rotates by decelerating the rotation of the gear 7.

To explain in more detail, the solenoid 3
is an iron core 3b around which a coil 3a is wound, and a spring 3
The actuating plate 3d is biased away from the iron core 3b by c, and the central portion is formed at one end of a claw body 9 rotatably supported with respect to the component mounting base material 2. The engaging groove 9a is connected to the actuating plate 3d.
By engaging with the tip end of the coil 3a, the coil 3a swings back and forth each time the coil 3a is energized. Forked claws 9b and 9c are formed at the other end of the claw body 9, and when one claw 9b swings in the direction of arrow C by the operation of the solenoid 3, the other claw 9c meshes with the driven gear 4, rotates the driven gear 4 by one mesh, and when the operating plate 3d of the solenoid 3, which has finished operating, is returned by the spring 3c, one claw 9b moves in the direction of arrow D. The driven gear 4 moves and meshes with the driven gear 4 again.
As a result, the driven gear 4 is rotated by two bites due to one operation of the solenoid 3. In addition, driven gear 4 and worm gear 5
are fixed to the same shaft 10, and this shaft 10
are rotatably supported relative to the component mounting base material 2, so that they rotate integrally with each other, and the rotation amount for two bites of the driven gear 4 is transmitted to the worm gear 5 by the same rotation amount. The large-diameter gear 7 is rotatably attached to a shaft 7a attached to the center of the stationary first ring gear 6, and the amount of rotation of the worm gear 5 is transmitted to the large-diameter gear 7. A first planetary gear 7c and a second planetary gear 7d are fixed to both ends of a shaft 7b which is rotatably attached to the shaft 7b passing through the periphery of the large diameter gear 7, and the first planetary gear 7c is immovable. The second planetary gear 7d meshes with the second ring gear 8. Further, the number of teeth of the first ring gear 6 and the second ring gear 8 are made to be slightly different.

With the above configuration, each time a voltage is applied to the coil 3a, the claw body 9 swings back and forth once in the directions of arrows C and D to rotate the driven gear 4, and the worm gear 5 is also rotated together with the driven gear 4. The rotation of the worm gear 5 causes the large-diameter gear 7 to rotate, and the first planetary gear 7c, which is meshed with the first ring gear 6, revolves with the rotation of the large-diameter gear 7 and meshes with the first ring gear 6. Therefore, the second planetary gear 7d also rotates while also revolving. Therefore, if the number of teeth of the first ring gear 6 and the second ring gear 8 were equal, the second ring gear 8 would not rotate at all, but since the number of teeth of both ring gears 6 and 8 are different,
The second ring gear 8 will rotate by an amount corresponding to the difference in the number of teeth.

Note that the number of teeth of the driven gear 4 is 10, and the number of teeth of the first ring gear 6 is 10.
When the number of teeth of the large diameter gear 7 is 60, the number of teeth of the first planetary gear 7c and the second planetary gear 7d is 15, and the number of teeth of the second ring gear 8 is 71. When the solenoid 3 operates 42,600 times, the second ring gear 8 rotates once in the direction of arrow E (see Figure 1), which is a sufficient number of operations for a normal device. I can do it.

The second ring gear 8 consists of a large diameter portion 8a and a remaining small diameter portion 8b extending at an arbitrary angle (approximately 180° in the figure), so that a cam surface 8c is formed on the outer periphery of the second ring gear 8. It is formed. 8d
is a stepped portion of the cam surface 8c. Further, a display plate 11 in different colors is integrally attached to the upper surface of the second ring gear to display the amount of rotation.

12 is a switch plate attached to the lower casing 1b, and this switch plate 12 is provided with a switch 13 consisting of a movable contact piece 14 and a fixed contact piece 15, and the movable contact piece 14 resists the biasing force. It comes into contact with the fixed contact piece 15 by pressing it. This switch plate 12 is inserted and fixed into a mounting portion 16 formed on the lower casing 1b.
A pressing portion 14a formed in a convex shape of the movable contact piece 14
In the state where the switch plate 12 is fixed,
It comes into elastic contact with the outer peripheral surface of the second ring gear 8. When the pressing part 14a is in elastic contact with the outer periphery of the large diameter part 8a of the second ring gear 8, the movable contact piece 14 is pressed by this outer peripheral surface and comes into contact with the fixed contact piece 15, and the pressing part 14a When it is in elastic contact with the outer periphery of the small diameter portion 8b, it is released from the pressing force and moves away from the fixed contact piece 15. Therefore, when the number of times the machine is used is within the durability range, the pressing part 14a of the movable contact piece 14 is moved to the second position as shown in FIG. 5a.
The ring gear 8 is brought into elastic contact with the outer periphery of the large-diameter portion 8a, and when the machine has been used a predetermined number of times, the stepped portion 8d of the cam surface 8c is brought into contact with the movable contact piece 14, as shown in FIG. 5b. The initial setting position of the second ring gear 8 is determined so that it comes into elastic contact with the pressing portion 14a. By doing this, the movable contact piece 14 and the fixed contact piece 15 are normally connected,
The movable contact piece 14 can be separated from the fixed contact piece 15 when the frequency of use of the machine reaches a predetermined frequency. Note that 17a and 17b are lead wires connected to the movable contact piece 14 and the fixed contact piece 15, respectively, and led out. As described above, the movable contact piece 14 and the fixed contact piece 15 are connected and disconnected, and the power source 1 set outside the display device as shown in FIG.
If an electrical signal is extracted by an extraction circuit composed of a resistor 8 and a resistor 19, a high-impact display can be performed using a buzzer, a liquid crystal display, etc. using this electrical signal.

Furthermore, the color of the display plate 11 integrally attached to the second ring gear 8 is such that the movable contact piece 14 is different from the fixed contact piece 15.
Before an alarm such as a buzzer is issued outside the room, a warning color (e.g. yellow) is made visible through the window 20 formed in the upper casing 1a, and the alarm color (e.g. red) is made visible at the same time as the alarm is issued. Make it visible.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and instead of the solenoid 3, a shape memory alloy, a bimorph made of different metals bonded together, etc. are used, and the device can handle different temperatures in the energized state and in the energized state. Alternatively, instead of a solenoid, a mechanism for driving the driven gear 4 from the outside may be used.Furthermore, a pulse motor may be used to drive the driven gear 4. It may be configured to rotate directly.

Further, in the above embodiment, the switch 13 is activated when the amount of rotation of the second ring gear reaches a certain amount.
was composed of a movable contact piece 14 that moves according to changes in the outer circumferential shape of the second ring gear 8, and a fixed contact piece 15 provided corresponding to the movable contact piece 14.
The configuration is not necessarily limited to this, and may be the following configuration.

That is, in FIG. 7, a convex portion 108a and a concave portion 108b are formed along the circumference on the side surface of the second ring gear 108, and the pressing portion 114a of the movable contact piece 114 is pressed against the convex portion 10.
When the pressing part 114a is in elastic contact with the convex part 108a, the movable contact piece 114 comes into contact with a fixed contact piece (not shown), and the pressing part 114a comes into contact with the concave part 108b. 108b
When in elastic contact with the movable contact piece 114, the movable contact piece 114 separates from the fixed contact piece. In FIG. 7, a colored display plate 111 is attached to the outer peripheral surface of the second ring gear 108.

Further, FIG. 8 shows an example of a case where the cam surface 208c formed on the second ring gear 208 is multi-staged, and in this FIG.
Three steps 20 on the outer periphery of the ring gear 208
8d. By forming the cam surface 208c in multiple stages in this way and providing movable contact pieces 214 corresponding to the number of formed steps 208d of the cam surface 208c, a plurality of switches that perform switching at different timings are configured. be able to. Therefore, with such a configuration, for example, a preliminary warning, a cautionary warning, a main warning, etc. can be displayed using different display means.

FIG. 9 shows still another embodiment of the present invention. In this embodiment, a cam surface is not formed on the second ring gear 308, and a cam member 308c that comes into elastic contact with the movable contact piece 314 is separately constructed. . That is, in this embodiment, the first ring gear 306 and the large diameter gear 30
A shaft 307a passing through the center of the shaft 307a is rotatable relative to the first ring gear 306 and the large diameter gear 307 and is fixed to the second ring gear 308, and a cam member 30 is attached to an extension of the shaft 307a.
8c is fixed. The movable contact piece 314 is provided so as to come into elastic contact with a cam surface (not shown) formed on the outer peripheral surface or side surface of the cam member 308c.
With this configuration, it is possible to adapt to cases where there is no space for providing a movable contact piece or a fixed contact piece on the second ring gear side.

In addition, in each of the above embodiments, a cam surface is formed on the second ring gear or a member that rotates integrally with the second ring gear, and the movable contact piece is brought into elastic contact with this cam surface, so that the amount of rotation of the second ring gear is maintained at a predetermined amount. However, it is not necessarily necessary to form a cam surface; for example, a conductive material can be printed or embedded in a part of the elastic trajectory of the movable contact piece, and this conductive material and the movable contact piece can be used to detect the contact point. The configured switch may perform switching when the amount of rotation of the second ring gear reaches a predetermined amount.

[Effect of idea]

As mentioned above, the display device of the present invention is configured with a reduction mechanism that combines a worm gear and a planetary gear, so the structure can be significantly simplified for this type of display device, and the drive source There is no load fluctuation, and the entire display range can be covered with a small driving force. Therefore, by simplifying the configuration and downsizing the drive source, the display device as a whole can be made significantly smaller and thinner. This also makes it possible to reduce costs, and furthermore, the display provided on the surface of the ring gear can be enlarged to make it easier to see.

In addition, by incorporating a switch that operates when the amount of rotation of the second ring gear reaches a predetermined amount,
It becomes possible to issue a warning such as a buzzer sound externally of this display device, and it is possible to extremely reliably display the usage limit of a component for which a delay in replacement would be fatal.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing one embodiment of the display device of the present invention, Fig. 2 is a plan view with the upper casing removed, Fig. 3 is a vertical sectional view, and Fig. 4 is a perspective view of the switch plate. Figures 5a and 5b are explanatory diagrams showing the relationship between the movable contact piece and the fixed contact piece with respect to the rotation of the second ring gear, and Figure 6 is a circuit diagram showing an example of extracting electrical signals as the switch opens and closes. 7th
The figures are a partial perspective view of another embodiment of the present invention, FIG. 8 is a partial perspective view of still another embodiment of the present invention, FIG. 10
The figure is a perspective view of a conventional example. 4... Driven gear, 5... Worm gear, 6...
1st ring gear, 7... large diameter gear, 7a... 1st
Planetary gear, 7b...Second planetary gear, 8...Second ring gear, 13...Switch.

Claims (1)

[Scope of utility model registration request] It has a worm gear that rotates integrally with a driven gear that is intermittently driven to rotate by a driving force from a drive source, and rotatably supports a first planetary gear that meshes with a first ring gear that is fixedly attached. a second planetary gear which is rotatably mounted in mesh with the worm gear, and which is mounted on a side of the large diameter gear opposite to the first planetary gear support surface and rotates integrally with the first planetary gear; is rotatably mounted concentrically with the large-diameter gear and meshes with a second ring gear having a different number of teeth from the first ring gear, and has a built-in switch that operates when the amount of rotation of the second ring gear reaches a predetermined amount. A display device characterized by: