JPS6315963Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a measuring device with a zero return mechanism used in a power meter or the like.

This type of weighing device is required to return the number on the number wheel that has been advanced through meter testing etc. to zero before shipping. In addition to being easy to use, it is desired that a stable fixing state can be obtained and that a device can be devised to prevent forgetting to fix the fixing device.

Conventional weighing devices with a zero return mechanism are known, for example, those shown in FIGS. a shaft 3 with a spur gear 2 rotated by a rotor of the watt-hour meter; a shaft 5 rotated via a ratio gear 4 connected to the shaft end of the shaft 3; a pinion shaft 7 rotated by a spur gear 6; a numerical axle 10 supporting a numerical wheel 9 rotated by a pinion 8;
The main component is a dial plate 11 screwed to the front side of the frame 1. The zero return mechanism disengages the number wheel 9 from the pinion 8 and allows the number wheel 9 to rotate freely. is supported by an elongated hole 12 extending in the direction of escape from the pinion shaft 7, and the ends of these shafts are normally engaged with each other to restrain movement in the direction of escape, that is, the direction of disengagement. zero return levers 1, each of which is formed on opposite sides and can be moved by rotation based on
3 and 14. Since the zero return levers 13 and 14 are constructed in the same manner except that they are on opposite sides, the lever body 13a is made of molded synthetic resin or the like so that the lever body 13a is removably attached to the side plate 1a and is rotatably supported. Shaft portion 13b
and a groove 13c forming a cam provided in the middle of the lever body 13a and engaging with the shaft end of the numerical axle 10.
and a protrusion 13d that can be engaged with each of the engagement holes 15 provided at the end of the lever main body 13a to fix the zero return lever 13 on the side plate in both the normal and zero return positions. It is provided.

In the above configuration, as is clear from the diagram, the zero return levers 13 and 14 are secured in both the normal and zero return positions, and the zero return operation can be performed by moving the zero return levers 13 and 14 from the normal position shown in the figure. This is easily possible because the number wheel 9 is disengaged from the pinion 8 because the number axle 10 moves simply by rotating to the zero return position shown by the chain line. However, in this mechanism, the position of the zero return levers 13, 14 is secured only by the frictional resistance when the protrusion 13d engages with either of the engagement holes 15; Since the number axle 10 supported by the number wheel 10 supports the number wheel 9, which has a relatively large mass, it rotates due to vibrations during transportation, and the number wheel 9 disengages from the pinion 8, causing the number wheel 9 to become disengaged. The arrangement of letters may change,
There was a drawback that it was difficult to discover if the zero return levers 13, 14 had been forgotten to return to their normal positions after the zero return operation.

This invention eliminates the above-mentioned conventional drawbacks, and provides a weighing device with a zero return mechanism that does not cause the position of the zero return lever to move due to vibration shock, etc., and has a function to eliminate forgetting to return after returning to zero. purpose.

According to this invention, the above object is to provide a frame body having both side plates arranged in parallel, a pinion shaft for inserting and supporting a pinion supported by the side plates through which the rotation of a rotating body is transmitted via a gear mechanism, and a pinion shaft for supporting the pinion. a numeric axle that inserts and supports numeric wheels corresponding to the number of digits that are sequentially rotated through the numeral axle; a dial plate that is removably attached to the front side of the frame body; a long hole movable in a direction away from the dial plate; a protrusion rotatably supported on each of the side plates; a protrusion on the side surface that abuts the back of the dial plate to restrict rotation in one direction; This is achieved by comprising a zero return lever provided with a groove that engages with each of both shaft ends to prevent movement of the shaft ends.

Examples of this invention will be described below based on the drawings. In FIGS. 5 to 7, parts corresponding to those of the conventional device shown in FIG. 1 are denoted by the same reference numerals, and the explanation thereof will be omitted, and the explanation will focus on the differences. First, as almost similar parts, both side plates 1a of the frame body 1,
1b includes shafts 3, 5, etc. of a gear mechanism that transmits rotational force from a rotor of a power meter (not shown) to a number wheel 9, and a pinion that is inserted into a pinion 8 rotated by the gear mechanism. A numeric axle 10 is pivotally supported via a shaft 7 and a pinion 8, and is inserted through a numeric wheel 9 corresponding to the number of digits that are sequentially rotated. The major change is that the zero return mechanism has been improved in earthquake resistance and a function has been added to prevent it from forgetting to return to the normal position.Since the dial plate 11 must be removed during zero return work, this has been improved. It is impossible to return to zero unless the dial plate 11 is folded into the structure of the mechanism, that is, the dial plate 11 is removed, and the return to the normal position is completed by attaching the dial plate 11. To this end, first, both shaft end support portions of the pinion shaft 7 provided on the side plates 1a and 1b are made into elongated holes 22 extending in a direction away from the number axle 10 and toward the dial plate 11, so that the pinion 8 and the number wheel 9 can be connected to each other. The pinion shaft 7 is moved to disengage the mesh, and then the zero return levers 23 and 24, which respectively engage both ends of the pinion shaft 7, are brought into engagement with the back surface of the dial plate 11. , the zero return levers 23 and 24 have a shaft portion 23b which is rotatably supported by the side plate 1a on the lever body 23a, and a cam-shaped groove 23c which engages with the end of the pinion shaft 7, as well as a cam-shaped groove 23c, which will be explained with reference to 23 as described above. A protruding portion 23d is provided which protrudes from the mounting surface of the dial plate 11 during zero return and whose surface positions coincide with each other during normal operation, that is, abuts against the back surface of the dial plate 11. In other words, when returning to zero, the dial plate 11 is removed and the zero return levers 23 and 24 are rotated to the positions shown by the chain lines, so the number wheel 9 becomes freely adjustable and zero return is possible. Since the rotation of the zero return levers 23 and 24 in the chain line direction, that is, the disengagement of the pinion 8 and the number wheel 9, is prevented, a stable normal state is inevitably obtained. Since the dial plate 11 must be attached and detached to return to zero, three claws 25 bent in the same direction are inserted between the front sides of both side plates 1a and 1b to facilitate this.
At the same time, two leaf springs 27 are attached to one side plate 1b, and the leaf springs 2
7 is formed into a U-shape, and the free end of the leg is a claw 25.
It is bent in the opposite direction to the bending direction of . On the other hand, the dial plate 11 has three square holes 28 into which the pawls 25 are fitted, and two square holes 29 into which the free ends of the leaf springs 27 are fitted and locked. Further, the joint plate 26 is provided with a guide groove 30 for smooth movement of the free end of the leaf spring 27. To attach and detach the dial plate 11 to and from the frame 1, insert the claw 25 and the free end of the leaf spring 27 into the square hole 2.
8 and 29, the bent portion of the pawl 25 and one side edge of the square hole 28, and the bent portion of the free end of the leaf spring 27 and the other side edge of the square hole 29 are connected by the spring force of the leaf spring 27. are respectively locked and fixed, and the leaf spring 2
The dial plate 11 can be removed by moving the dial plate 11 to the right while pressing the free end bent portion of the dial plate 7 inward, so that it can be attached and detached with a so-called one-touch operation.

Note that the projections 23e and 24e provided below the zero return levers 23 and 24 are used when the side plate 1 is
It is engaged with a stopper 1c provided below the zero return levers 23 and 1b to prevent the zero return levers 23 and 24 from rotating more than necessary.

As described above, this invention provides a zero return mechanism that securely fixes the normal state, prevents forgetting to return to zero, and shortens the time required to return to zero, thereby improving the reliability of the weighing device. The contribution to improvements in performance and cost reduction is significant. Further, in the description of the embodiment, a measuring device of a power meter is used, but it is of course applicable to a measuring device of other meters.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of a conventional weighing device with a zero return mechanism, Fig. 2 is a side view of Fig. 1 seen from the P arrow direction, and Fig. 3 is a side view of Fig. 1 seen from the Q arrow direction. FIG. 4 is a side view, FIG. 4 is an enlarged perspective view of the main part of FIG. 2, FIG. FIG. 5 is a side view of FIG. 5 viewed from the direction of the arrow R, and FIG. 7 is an enlarged perspective view of the main part of FIG. 1...Frame body, 1a, 1b...Side plate, 7...Pinion shaft, 8...Pinion, 9...Number wheel, 10...
...Number axle, 11...Dial plate, 22...
...Long hole, 23, 24... Zero return lever, 23c...
...Groove, 23d...protrusion.

Claims (1)

[Scope of utility model registration request] a frame body having both side plates arranged in parallel; a pinion shaft that passes through and supports a pinion supported by the side plates to which the rotation of the rotating body is transmitted via a gear mechanism; and a girder that is sequentially rotated via the pinion. a numeric axle through which a numeric wheel corresponding to the number is inserted and supported; a dial plate that is removably attached to the front side of the frame; and a length that allows the pinion shaft provided on both side plates to move in a direction away from the numeric axle. rotatably supported in the hole and each of the side plates, and on the side,
a protrusion that abuts the back surface of the dial plate to restrict rotation in one direction; and a zero return lever that is provided with a groove that engages with each of both shaft ends of the pinion shaft to prevent movement of the shaft ends. A measuring device with a zero return mechanism.