JPH0244234Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an hour meter, particularly to its internal structure.

FIGS. 1 and 2 show the internal structure of the conventional one. A pair of shafts 7, 8 have both ends connected to the side walls 2, 2 at the front of the frame 1, which integrally has side walls 2, 2 on both sides. A plurality of number wheels 4 are attached to one shaft 7, a plurality of shift pinions 8 are attached to the other shaft 8, and a reduction gear train is attached to the rear of the frame 1. The rotation of the motor 20, which is attached to the rear of the frame 1, is transmitted to the number wheel 4 of the lowest digit through the reduction gear train 6 and the worm shaft 11 whose axial direction is in the longitudinal direction of the frame 1.
The signal is transmitted to the worm wheel 12 provided at
rotation can be transmitted to. However, this product has a problem with its ease of assembly. In other words, when attaching the number wheel and the digit feed pinion to the respective shafts, remove at least one end of both shafts on the side of the lowest digit from the side wall, and then attach the digit wheel and the digit feed pinion to the respective shafts. As it is assembled, the gap with the side wall becomes smaller, and the number wheel for the lowest digit has to be assembled by hand, as it has a worm wheel and sometimes interferes with the worm. It would be difficult without it. Furthermore, since the directions of the axes of the number wheel and shift pinion and the axis of the reduction gear train are different, it is necessary to assemble from two directions, sometimes three directions, and if automatic assembly is performed, It is necessary to change the direction of the frame and the insertion direction of the assembled parts for each part, which complicates the work process, increases the number of man-hours, and causes troubles to occur more frequently. Therefore, the structure is almost impossible to assemble automatically.

The present invention has been devised in view of these points, and its purpose is to provide an hour meter that is easy to assemble and whose assembly can be easily automated.

To explain the present invention below, the present invention comprises a frame having a side wall on one side, a side wall attached to the open other side of the frame, and a number wheel or a digit pin between the side walls. The axes of the deceleration gear train are installed parallel to each other, and the worm shaft that connects the deceleration shaft side and the number wheel side is perpendicular to these axes, and the other side is open. It is characterized by being removably supported from the axial direction of each shaft by formed bosses, and the number wheel, shift pinion, and reduction gear train are attached to each shaft in the axial direction of the frame. In addition to being able to do this from one side, the worm shaft, which is perpendicular to these axes, can also be installed from the same direction. To explain in detail based on the illustrated embodiment, FIG. 3 shows one embodiment in which the frame 1 integrally has a side wall portion 2 only on one side and is open on the other side. The front chamber is divided into two spaces, front and rear, by a partition wall 15, and the front and upper surfaces of the front chamber are open, and the rear chamber is open only on the other side. A separately formed side wall 3 is attached to one open side of the frame 1, and shafts 7, 8 of a number wheel 4 and a shift pinion 5 disposed in the front chamber are attached. The shafts 9 and 10 of the reduction gear train 6 disposed in the rear chamber are installed parallel to each other between the side wall portion 2 and the side wall 3 of the frame 1. The worm shaft 11, in which the worms 13 and 14 at both ends are positioned respectively so that the axial direction is the front-back direction, is supported by a boss 16 that is integrally provided with the partition wall 15 and is open on the side wall 3 side. It is something.

However, when assembling the lever,
With the side wall 3 not attached to the frame 1,
A number wheel 4 is attached to shafts 7 and 8 that are fixed at one end to the side wall 2 of the frame 1 or are formed integrally with the side wall 2.
and shift pinion 5 from the open one side, respectively, from the upper digit side, and in the same way, the reduction gear train 6 is assembled to the shafts 9, 10, and then the boss 16 is assembled from the open side. Worm shaft 11
Finally, the side wall 3 is attached to the frame 1, and each free end of the shafts 7, 8, 9, and 10 is supported by the side wall 3. After this, the motor 20 is further attached to the rear notch of the frame 1, the motor 20 is housed in the case 21, and the front cover 22 is attached, thereby completing the assembly as shown in FIG. 4. Reference numeral 19 indicates a rotation display section provided on the tip end surface of the worm shaft 11, and reference numeral 18 indicates a display window.

As described above, with the present invention, each part to be attached to the shaft can be assembled from one end of the shaft without any obstructions, and the worm shafts perpendicular to these shafts are also the same. Since it can be assembled from any direction, there is no need to change the direction of the frame, and there is less handling of parts, automatic assembly can be easily achieved.

[Brief explanation of the drawing]

Fig. 1 is a front view of the conventional example, Fig. 2 is a longitudinal sectional view of the same, Fig. 3 is a partially broken exploded perspective view of an embodiment of the present invention, and Fig. 4 is a perspective view of the same when the above is assembled. 1 is the frame, 2 is the side wall, 3 is the side wall, 4 is the number wheel, 5 is the shift pinion, 6 is the reduction gear train, 7,
8, 9, and 10 are shafts, 11 is a worm shaft, and 16 is a boss.

Claims (1)

[Scope of utility model registration request] A frame having a side wall on one side and a side wall attached to the open other side of the frame, and between the side walls, a number wheel, a shift pinion, and each shaft of a reduction gear train are connected to each other. A worm shaft, which is installed in parallel and orthogonal to each of these axes and connects the deceleration shaft side and the number wheel side, is connected to each of the above-mentioned axes by a boss formed with the other side open. The hour meter is removably supported from the axial direction.