JP3404994B2 - Integrator with zero return device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to, for example, a mileage accumulator of an automobile, and rotates a return shaft with a return lever to form a numeral wheel. The present invention relates to an integrator with a zero-return device for returning a display to zero. 2. Description of the Related Art Generally, as shown in FIG. 11, a multimeter with a zero-return device is provided with a gear portion 22 and a heart-shaped cam 23 on a plurality of numeral wheels 21 which are arranged and supported in parallel on a frame. Is provided,
A return-to-zero shaft 24 is disposed rotatably in the side axial direction of the numeral wheel 21 within a certain angle range. The return-to-zero shaft 24 is provided with a return-to-zero lever 25 engageable with the heart-shaped cam 23. A pinion 26 that can mesh with the gear portion 22 of the numeral wheel 21 is supported by a shaft 27 and configured. [0003] In a return-to-zero device having such a structure, a return-to-zero shaft 24 raises a return-to-zero lever 25 and a pinion 26 to a number as shown in FIG. When a return-to-zero knob (not shown) is pressed so as to be able to engage with the gear portion 22 of the wheel 21, the return-to-zero shaft 24 is rotated clockwise as shown in FIG.
When the pinion 26 separates from the gear portion 22, and the return-to-zero lever 25 pushes the heart-shaped cam 23 of the numeral wheel 21 at the tip thereof, the numeral wheel 21 is returned to the zero position. However, in order to prevent unnecessary rotation of the numeral wheel 21, the pinion 26 has long teeth 2 long in the axial direction.
6a and short short teeth 26b are alternately arranged, a rectangular shaft portion 26c is provided at the shaft portion, and a leaf spring 28 elastically contacts the rectangular shaft portion 26c. For this reason, for example, as shown in FIG. 12A, when the integrator operates, a carry operation is started, and when the long teeth 26a of the pinion 26 mesh with the gear portion 22, the return-to-zero knob is set. 12 is temporarily pushed slightly for some reason, as shown in FIG. 12 (B), the return-to-zero shaft 24 is temporarily rotated slightly clockwise and the pinion 26 is moved to the gear portion 22.
Away, the pinion 26 rotates about 45 ° to either side,
Again, as shown in FIG. 12C, the pinion 26 is
2, but at this time, the long teeth 26a of the pinion 26
Instead, the short teeth 26b mesh with the gear portion 22. In a normal state, the long teeth 26 of the pinion 26
a meshes with the gear portion 22 so that the numeral wheel 2
1 carries out a carry operation, but when the short teeth 26b of the pinion 26 mesh with the gear portion 22 as shown in FIG. 12C, the numeral wheel 21 is locked, and a normal carry operation can be performed. There was a problem that disappeared. SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made in view of the above-mentioned circumstances. An object of the present invention is to provide an integrator with a zero device. In order to achieve the above object, an integrator with a zero-return device according to the present invention has a gear portion on one side and two teeth on the other side, and has the same configuration. A plurality of number rings rotatably supported on a shaft, a heart-shaped cam provided substantially at the center of the side of the number ring, and a number in parallel with a shaft on which the plurality of number rings are supported; A zero-shaft that is pivotally supported adjacent to the wheel and a long tooth that is axially supported and a short tooth that is short in the axial direction are alternately arranged while being supported by a part of the zero-shaft. A pinion meshing over the two teeth and the gear portion, and a return-to-zero operation lever provided at a part of the return-to-zero shaft. In the integrator with a zero-return device for zeroing each number wheel by pushing the heart-shaped cam, a counter rotation at two teeth of the number wheel is provided. A tapered surface on which the pinion short teeth can pass over the inside of the tooth on the
The long teeth of the pinion are
It is characterized in that it is formed to be engageable . In the integrator with the zero-return device having the above-described structure, the carry operation is started during the integrating operation of the integrator, and the long tooth of the pinion is located between the two teeth. If the return-to-zero knob is temporarily incompletely pressed for some reason during the meshing, the return-to-zero shaft 4 slightly rotates to separate the pinion from the two teeth,
The pinion rotates about 45 ° in either direction and again immediately engages the two teeth. At this time, not the long teeth but the short teeth of the pinion mesh between the two teeth. However, since the taper surface on which the short teeth can be passed is formed on the side transmitting the rotational force of the numeral wheel to the pinion, that is, on the non-rotating side of the two teeth, the carry wheel is operated. When is rotated, the short teeth of the pinion can ride over the tapered surface. As a result, the number ring is part 2
The engagement between the sheet teeth and the short teeth of the pinion can be disengaged, and the numeral wheel can be normally carried up without locking the numeral wheel (pinion) when carrying. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of an integrator with a speedometer for an automobile, FIG. 2 is a left side view thereof, and FIG. 3 is a bottom view thereof. The integrator with a zero-return device is arranged at the lower stage in FIG. 1, and four numeral wheels 1 are rotatably supported on a frame 10 by a shaft 9. A gear 8 having teeth on both sides is rotatably supported on the right end of the four number wheels 1, and a cover disk 7 is rotatably supported on the left end. The four number wheels 1, the cover disk 7 and the gear 8 are supported side by side on a shaft 9, but each number wheel and the like can be moved slightly in the axial direction, so that there is no gap between the cover plate 7 and the frame. A coil spring is externally fitted to the shaft 9, and the number wheels and the like are urged to the right by this spring to prevent rattling. Reference numeral 19 denotes a drive unit such as a motor. The output shaft of the drive unit 19 meshes with the gear 8 via a small gear, and the gear 8 is driven to rotate according to the traveling distance. As shown in FIGS. 4 to 6, a gear portion 1a having continuous teeth is provided on the right side, and two teeth 1b and 1c are provided on the left side, as shown in FIGS. A heart-shaped cam 1d for resetting is provided substantially at the center of the cam. Number wheel 1
Is normally rotated in the counterclockwise direction in FIG. 5 to carry the gear, but the inside of the anti-rotation side tooth 1c of the two teeth is notched so as to be inclined, and a tapered surface 1e is formed there. You. As shown in FIGS. 4 and 7, the tapered surface 1e is formed inside the two teeth 1c so as to open laterally. The tips of the teeth 6b abut against the tapered surface 1e, the short teeth 6b are removed from between the two teeth 1b and 1c to prevent locking, and when the long teeth 6a of the pinion 6 are normally engaged, the tapered surface 1e
Instead, the tapered surface 1 is engaged with the side surfaces of the two teeth 1c so that the torque of the numeral wheel 1 is transmitted to the pinion 6 normally.
e is formed on the two teeth 1c. The return-to-zero shaft 4 is supported on a frame 10 so as to be rotatable within a fixed angle range in the axial direction of the side of the numeral wheel 1. The return-to-zero shaft 4 is provided with a return-to-zero lever 5 which can be engaged with the heart-shaped cam 1d so as to be inserted between the numeral wheels. Further, on a shaft 16 supported away from the central axis of the return shaft 4, three pinions 6 meshable with the gear portion 1a and the two teeth 1b, 1c of each numeral wheel 1 are rotatable. Gear part 1 of the number wheel 1 at the right end while being pivotally supported
A small pinion 17 that can mesh with the gear a is rotatably supported. In other words, the rotation of the gear 8 is transmitted via the small pinion 17 to the numeral wheel 1 on the left side thereof, and when carrying with the rotation of the numeral wheel 1, each of the wheels located between the adjacent numeral wheel 1 is rotated. It is configured to rotate the numeral wheel on the left side through the pinion 6 to carry. Each pinion 6 has a long long tooth 6a and a short short tooth 6b in the axial direction to prevent unnecessary rotation of the numeral wheel 1.
Are arranged alternately. Further, these pinions 6 are provided with a rectangular shaft portion, and a leaf spring portion 18 extending from the shaft 4 is elastically abutted on one surface of the rectangular shaft portion. Rotate by °. Each of the pinions 6 having such a configuration is disposed so as to mesh with the adjacent two teeth 1b and 1c of the right numeral wheel 1 and the gear portion 1a of the left numeral wheel 1. As shown in FIGS. 1 and 2, one end of the return-to-zero shaft 4 projects to the side of the frame 10, and a crank portion 4a is provided thereat. Are provided to protrude sideways. A guide portion 13 for supporting a resetting knob 15 for resetting operation is provided on the extending portion of the frame 10 near the engaging convex portion 4b, and a plate portion 14 below the guiding portion 13 is provided. , A guide hole 14a is formed. The return-to-zero knob 15 is located below the rod-shaped knob.
The engaging portion 15b is configured to protrude laterally. The engaging portion 15b is provided with a concave portion for inserting and engaging the engaging convex portion 4b. Further, an elastic protrusion 15c is provided below the return-to-zero knob 15 so as to protrude laterally. When the knob is depressed, the elastic protrusion 15c hits the periphery of the guide hole 14a of the frame plate portion to generate a sense of moderation. Plate 14
The coil spring 12 is interposed between the and the base of the engaging portion 15b. Therefore, when the reset knob 15 is pushed in,
As shown in FIG. 2, the engaging portion 15b compresses the coil spring 12 and moves to the left. At this time, the engaging portion 4b is engaged with the engaging convex portion 4b engaging with the concave portion of the engaging portion 15b via the crank portion 4a. 2 is rotated in the counterclockwise direction in FIG. 2 to push the return-lever lever 5 between the numeral wheels, and the pinion 6 and the small pinion 17 supported by the shaft 16 are connected to the numeral wheels 1 and It operates to move away from the gear 8. Next, the operation of the integrator having the above-described configuration with a zero-reducing device will be described. When the return-to-zero shaft 4 is pushed in order to return the integrator to zero, the engaging portion 15b also moves in the direction of the arrow in FIG. 2, and the engaging convex portion 4b and the crank portion 4a that engage with the engaging portion 15b. 2 rotates the return-to-zero shaft 4 counterclockwise in FIG. Due to the rotation of the zero return shaft 4, each pinion 6 separates from the gear portion 1a and the two teeth 1b and 1c of the numeral wheel 1, and the small pinion 17 separates from the gear 8 and the gear portion 1a of the numeral wheel 1. At the same time, the return-to-zero lever 5 acts to push the heart-shaped cam 1d of the numeral wheel 1 at its tip, thereby returning the four numeral wheels 1 to the zero position. On the other hand, during the integrating operation of the integrator, the carry operation is started, and the long teeth 6a of the pinion 6 are replaced with the two teeth 1b, 1c.
When the return-to-zero knob 15 is temporarily pressed slightly for some reason during the meshing, the return-to-zero shaft 4 temporarily rotates slightly to move the pinion 6 away from the two teeth 1b, 1c. When the pinion 6 is rotated by about 45 ° to either side and the pinion 6 immediately again engages with the two teeth 1b, 1c, as shown in FIG.
The teeth 1b and 1c are engaged with each other. However, the inner side (short teeth 6) of the two teeth 1c on the side that transmits the rotational force of the numeral wheel 1 to the pinion 6, that is, the anti-rotation side.
b), the tapered surface 1e is formed, so that when the numeral wheel 1 is rotated by the carry operation, the short teeth 6b of the pinion 6 are raised on the tapered surface 1e as shown in FIG. At this time, the short teeth 6b can pass over the two teeth 1c as shown in FIG. 10 by slightly inclining the pinion and the numeral wheel. Thus, the numeral wheel 1 is shown in FIGS.
As shown in the figure, the two teeth 1c and the short teeth 6b of the pinion 6
Can be disengaged, and the numeral wheel 1 can carry out the carry operation normally without locking the pinion 6 at the time of carry. In the above-described embodiment, the case where each number wheel 1 rotates forward in the direction of the arrow in FIG. 8 and the like when the vehicle is traveling forward has been described. In order to prevent such a lock of the number wheel (pinion) at the time of reverse rotation, the two teeth 1b on the opposite side of rotation at the time of reverse rotation
May be provided with a tapered surface by notching the inside of the tapered shape.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an integrator with a zero-reducing device showing one embodiment of the present invention. FIG. 2 is a left side view of the integrator. FIG. 3 is a bottom view of the integrator. 4 is an enlarged front view of the numeral wheel 1. FIG. FIG. 5 is a left side view of the numeral wheel 1. FIG. FIG. 6 is a perspective view of the numeral wheel 1. FIG. FIG. 7 is a cross-sectional view of a state in which two teeth of the numeral wheel 1 and short teeth of the pinion 6 are incorrectly meshed. FIG. 8 is an explanatory cross-sectional view showing an incorrectly meshed state of short teeth of a pinion and two teeth of a numeral ring. FIG. 9 is an explanatory cross-sectional view showing an incorrectly meshed state of short teeth of a pinion and two teeth of a numeral ring. FIG. 10 is an explanatory cross-sectional view showing an incorrectly engaged state of short teeth of a pinion and two teeth of a numeral ring. FIG. 11 is an explanatory cross-sectional view showing a zero-return operation of a conventional integrator. FIG. 12 is an explanatory cross-sectional view showing a zero operation of a conventional integrator. [Description of Signs] 1-number wheel, 1a-gear part, 1b, 1c-two teeth, 1d-heart cam, 1e-tapered surface 4-return shaft, 5-return lever, 6-pinion, 6a -Long teeth, 6b-short teeth, 15-zero return knob.

Claims (1)

(57) [Claims 1] A plurality of numeral wheels having a gear portion on one side and two teeth on the other side and rotatably supported on the same shaft, A heart-shaped cam provided substantially at the center of a side portion of the numeral ring; a return-free shaft pivotally supported in parallel with an axis on which the plurality of numeral rings are supported and adjacent to the numeral wheel; A pinion that is axially supported by a part of the return-to-zero shaft, and alternately arranges long teeth that are long in the axial direction and short teeth that are short in the axial direction, and meshes over the two teeth of the adjacent numeral wheel and the gear portion. And a resetting lever provided for a part of the resetting shaft for resetting operation. The resetting shaft is rotated, and the heart-shaped cam is pushed by the resetting lever to return each numeral wheel. In the integrator with a zero-return device for zeroing, the short tooth of the pinion is mounted inside the non-rotation side tooth of the two teeth of the numeral wheel. For example can be tapered surface, the tooth
It is formed by notching the inside in a taper shape.
The tooth | gear provided with the surface is formed so that the long tooth | gear of the said pinion can engage .