JPH0749566Y2 - Countermeasure tamper prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a tamper proof operation preventing device for integrating and displaying a mileage value of a vehicle, for example.

[Prior Art] Conventionally, as this kind of integrating meter, for example, the one having the structure shown in FIGS. 7 to 10 is known. In this case, the holding shaft 2 is arranged on the frame 1 and the holding shaft 2 is provided on the outer peripheral surface. A plurality of number wheels 3 printed with numbers 0 to 9 are provided, and in this case, the lowest number digit wheel 3 that displays a 100m value and six number wheels 3 that display a km value, a total of seven numbers. The wheels 3 are arranged, and the holders 4 are fixedly arranged between the respective number wheels 3 by engaging the locking pieces 4a with the main plate 1a fixed to the frame 1 so that each holder 4 has six teeth. The pinion 5 is provided, and two intermittent teeth 6 that can be meshed with the lower digit side of the pinion 5 are formed on the side surface of the upper digit side of the numeral wheel 3 and 20 that can be meshed with the upper digit side of the pinion 5. The continuous teeth 7 are formed on the side surface of the numeral wheel 3 on the lower digit side.

However, in this case, the rotation of the flexible wire (not shown) causes the gear 8 to rotate and the lowest-order digit wheel 3 to rotate,
The number wheel 3 on the upper digit side is sequentially rotated through the respective pinions 5 so that the traveling distance value is cumulatively displayed on the display window 10 of the dial 9 by each number wheel 3.

By the way, in these totalizers, for example, the structure shown in Japanese Utility Model Publication No. 63-8996 has been proposed in order to deal with a fraudulent act of intentionally reversing the numeral wheel 3 to reduce the total value.

[Problems to be solved by the invention] However, in the case of these conventional structures, although the measures against the incorrect reverse rotation of the numeral wheel have been taken as described above, the numeral wheel is intentionally continuously rotated forward and the displayed value is intentionally changed. Has the inconvenience of not being able to deal with fraudulent acts of zeroing out and making it an illegal value.

[Means for Solving the Problems] The present invention is intended to solve these disadvantages, and its gist is to arrange a holding shaft on a frame and a plurality of numeral wheels on the holding shaft. Then, a holder is arranged between each number wheel, a pinion is arranged in each holder, and intermittent teeth that can mesh with the lower digit side of the pinion are formed on the side surface of the upper digit side of the number ring and the upper digit of the pinion. When the continuous teeth that can be meshed with the side are formed on the side surface of the lower digit side of the numeral wheel, when the respective numeral wheels are rotated by digit shifting and the predetermined value is displayed, A part of the continuous teeth is formed in a toothless state so that the meshing with the pinion can be released, and a retaining mechanism is arranged to prevent the rotation of the numeral wheel of the highest digit in the display state. The tamper proof device is characterized by that.

[Operation] When the numeral wheel is rotated by a digit to display a predetermined value, some of the continuous teeth of the numeral wheel of the highest digit are formed in a toothless state, so that the engagement with the pinion is released, and The stop mechanism prevents the highest digit from rotating.

[Embodiment] FIGS. 1 to 6 show an embodiment of the present invention, FIGS. 1 to 3 show the first embodiment, FIGS. 4 and 5 show the second embodiment, and FIG. 6 shows the third embodiment. This is an example.

The same reference numerals are used for the same mode parts of the conventional structure shown in FIGS. 7 to 10.

In the first embodiment shown in FIGS. 1 to 3, reference numeral 3a is the numeral wheel of the most significant digit of the numeral wheels 3 and, in this case, 100,000 km.
The value is displayed, and a predetermined value such as 1, 2 or 3 is displayed.
When an arbitrarily set number such as is displayed in the display window 10, in this case, when the number of 1 is displayed, the continuous tooth 7 of the uppermost digit number wheel 3a to be meshed with the pinion 5 is in the toothless state. It is formed by forming the toothless portion 7b.

In this case, of the 20 continuous teeth 7a, two are in a toothless state and are configured as 18 continuous teeth 7a.

11 is a stop mechanism, in this case, the uppermost digit
A stopper recess 12 is formed on the lower side of 3a, an elastic piece 13 is formed on the upper digit side of the holder 4 in the shape of a leaf spring, and the tip of the elastic piece 13 has a numerical value displayed on the numeral wheel 3a of the highest digit. In the display state of a predetermined value, in this case, when the numeral 1 of the most significant digit wheel 3a is displayed on the display window 10, the stopper convex portion 14 is formed so as to fall into and engage with the stopper concave portion 12. .

Since the first embodiment has the above-mentioned configuration, the numeral wheel 3 is intentionally used.
And the respective number wheels 3 are sequentially rotated by the respective pinions 5 to rotate to a predetermined value, in this case, when the number 1 is displayed, some of the continuous teeth of the number wheel 3a of the most significant digit are missing. Since it is formed in a toothed state, the meshing with the pinion 5 is released, transmission of the digit feed rotation to the uppermost digit number wheel 3a cannot be transmitted, and the stopper convex portion 14 falls into the stopper concave portion 12 of the retention mechanism 11. The rotation of the uppermost digit number wheel 3a is prevented by locking, and therefore, the uppermost digit number wheel 3a has a predetermined value,
For example, the display state of the number 1 can be surely held, and thereby, it is possible to prevent an illegal act in which the number wheel 3 is intentionally rotated and rotated to change the integrated numerical value.

The second embodiment shown in FIGS. 4 and 5 shows another structure. In this case, the pinion 5 of the first embodiment is applied to a totalizer having a structure in which the torsion spring 15 repels the pinion 5 to prevent the pinion 5 from floating. In this retaining mechanism 11, the tip end of the torsion spring 15 is projected to the upper digit side through the holder 4 to form a stopper convex portion 14, and the displayed numerical value of the numeral wheel 3a of the highest digit is a predetermined value. A value, in this case, a stopper recess 12 is formed on the side of the uppermost digit number wheel 3a on the lower digit side where the stopper protrusion 14 provided on the holder 4 falls and locks when the numeral 1 is displayed on the display window 10. And a pinion when the displayed numerical value is a predetermined value on the side of the uppermost digit number wheel 3a on the lower digit side as in the case of the first embodiment. The continuous tooth 7a to be meshed with the gear 5 is made into a toothless state to form a toothless portion 7b.

Also, the numeral 0 of the highest digit is displayed in the display window 10, and the numeral wheel 3 rotates 36 degrees to display the numeral 1. The continuous tooth 7a at the rear position of 7b is formed in a toothless state, and this portion is formed as a sliding portion of the stopper convex portion 14.

Since the second embodiment has the above-mentioned configuration, the numeral wheel 3 is intentionally used.
And the respective number wheels 3 are sequentially rotated by the respective pinions 5 to rotate to a predetermined value, in this case, when the number 1 is displayed, some of the continuous teeth of the number wheel 3a of the most significant digit are missing. Since it is formed in a toothed state, the meshing with the pinion 5 is released, transmission of the digit feed rotation to the uppermost digit number wheel 3a cannot be transmitted, and the stopper convex portion 14 falls into the stopper concave portion 12 of the retention mechanism 11. The rotation of the uppermost digit number wheel 3a is prevented by locking, and therefore, the uppermost digit number wheel 3a has a predetermined value,
For example, the display state of the number 1 can be surely held, and thereby, it is possible to prevent an illegal act in which the number wheel 3 is intentionally rotated and rotated to change the integrated numerical value.

The third embodiment of FIG. 6 also shows another structure, in which the stopper mechanism 12 is formed as a hole in the thick portion of the numeral wheel 3a of the uppermost digit as the retaining mechanism 11, and the upper digit of the holder 4 is The elastic piece 13 is formed in a leaf spring shape on the side, and the tip of the elastic piece 13 is
The displayed numerical value of the highest-order digit wheel 3a is in a predetermined display state. In this case, when the numeral 1 of the highest-digit digit wheel 3a is displayed on the display window 10, the stopper projection is depressed into the stopper recess 12 and engaged. The portion 14 is formed and the continuous tooth 7a is formed in the toothless state similarly to the first embodiment.

Even in the third embodiment, the same operational effect as in the first embodiment can be obtained.

The present invention is not limited to the above-described embodiment, but can be applied to, for example, those in which the digit feed rotation transmission mechanism of the numeral wheel is different, and the structure of the retaining mechanism is appropriately changed and designed.

Further, in the above embodiment, when the numeral 1 is displayed on the display window 10, the rotation of the numeral wheel 3a of the most significant digit is prevented, but not limited to this numeral 1, the numerals 2 to 9 are selected.

[Effect of the Invention] As described above, the present invention intentionally rotates the numeral wheels forward, and when each numeral wheel is sequentially rotated by each pinion and turned to a predetermined value display state, the numeral wheel of the most significant digit continues. Since part of the teeth is formed in a toothless state, the meshing with the pinion is released, and it becomes impossible to transmit the digit feed rotation to the most significant digit number wheel,
Moreover, the rotation of the highest-order digit number wheel is prevented by the retention mechanism, so that the highest-order digit number wheel surely holds the display state of the predetermined value. It is possible to prevent an illegal act of changing the integrated numerical value by rotating the digit.

As described above, the intended purpose can be sufficiently achieved.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is an exploded perspective view of the first embodiment, FIG. 2 is a partial side view thereof, FIG. 3 is a partial sectional view thereof, and FIG. An exploded perspective view of the embodiment, FIG. 5 is a partial side view thereof, FIG. 6 is a partial sectional view of a third embodiment, FIG. 7 is a side view of a conventional structure, FIG. 8 is a partial exploded perspective view thereof, FIG. 9 is a partial side view thereof, and FIG. 10 is a partial sectional view thereof. 1 ... frame, 2 ... holding shaft, 3 ... number ring, 3a ...
Number ring of the most significant digit, 4 …… holder, 5 …… pinion,
6 ... intermittent tooth, 7 ... continuous tooth, 7a ... continuous tooth of the highest digit, 11 ... stop mechanism.

Continuation of the front page (56) Reference JP-A-3-225581 (JP, A) JP-A-3-225582 (JP, A) Actually open 3-37565 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A holding shaft is arranged on a frame, a plurality of numeral wheels are arranged on the holding shaft, and a holder is arranged between the numeral wheels.
A pinion is installed in each holder, and intermittent teeth that can be meshed with the lower digit side of the pinion are formed on the side surface of the upper digit side of the number ring, and continuous teeth that can be meshed with the upper digit side of the pinion are the lower digit of the number ring. In the one formed on the side surface on the side, when each of the numeral wheels is rotated by a digit and a predetermined value is displayed, a part of the continuous teeth of the numeral wheel of the highest digit is formed in a toothless state. A device for preventing unauthorized operation of a totalizer, wherein the engagement mechanism with the pinion is provided so as to be capable of being released, and a stop mechanism for preventing the rotation of the numeral wheel of the highest digit in the display state is arranged.