JP2726909B2 - Hour meter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an hour meter. BACKGROUND ART FIGS. 10 and 11 show a conventional hour meter. As shown in the figure, this hour meter has a front panel 32 fitted into a front opening of a case 26. On the front panel 32, a time display window 32a is provided. Case 26
A frame block C is housed therein. In the frame block C, the main plate 11 and the motor 19 are assembled to the frame 1. A first character wheel axle 6a and a second character wheel axle 6b are fixed to the frame 1. The first character wheel axle 6a has a predetermined number of character wheels 2 and a driving character wheel (driving wheel) 5.
Are rotatably inserted, and a predetermined number of pinions 3 are rotatably inserted into the second character axle 6b. Character car 2
The number from 0 to 9 is described in the driving wheel 5. On the main plate 11, a fourth gear (worm) 8, a third gear (worm) 9, and a second gear (worm) 10 are arranged, respectively. This time meter is usually assembled as follows. First, the fourth gear 8 is set on the frame 1.
Next, the first character axle 6a is inserted through the through hole on one side of the frame 1 and the driving wheel 5 and the character wheel 2 are inserted into the first axle 6a. The other end of the first character axle 6a is inserted into the through hole on the other side of the frame 1. Press-fit. Similarly, the second character wheel axle 6b is inserted through the through hole on one side of the frame 1, the pinion 3 is inserted therein, and the other end of the second character wheel axle 6b is pressed into the through hole on the other side of the frame 1.
Thereafter, the third gear 9, the second gear 10, the main plate 11, and the motor 19 are assembled, and these are fixed with the screws 14. As a result, a frame block C is obtained. The frame block C is assembled into the case 26, the opening of the case 26 is covered with the front panel 32, and screws are inserted from outside the case 26 to fix the frame block C to the case 26. It is difficult for this time meter to automatically assemble the frame block C because the assembling direction is not constant. Also, the work of incorporating the frame block C into the case 26
Since it is necessary to insert the frame block C into the case 26, fix the front panel 32 to the case 26, and fix the frame block C to the case 26 with screws, it is still difficult to automatically assemble. It is also difficult to continuously carry out the work of assembling the frame block C and assembling the frame block C into the case 26. For this reason, this time meter has not been able to easily automate the entire assembly. FIGS. 12 (a) to 12 (d) show another conventional hour meter. This hour meter also has a front panel 32 having a time display window fitted into the front opening of the case 26. The frame 26 is accommodated in the case 26. In the frame block C, the main plate 11 and the motor 19 are assembled to the frame 1. A first character wheel axle 6a and a second character wheel axle 6b are fixed to the frame 1, and a predetermined number of the character wheel 2 and the drive character wheel 5 are rotatably inserted into the first character axle 6a. A predetermined number of pinions 3 are rotatably inserted into the second character axle 6b. Main plate
11 includes a hertz switching lever 20, a second gear 10, a third gear 24, a fourth gear 18, a fifth gear 9, a sixth gear 8, a first planetary gear 23, and a second
Planet gears 22 are respectively arranged. In the figure, 15 is a holding spring, 25 is a front sheet, 31 is a dustproof sheet, 33 is a washer, 34 is a nameplate, 35 is a screw, 35 is a nut, 37 is a washer,
38 is a decorative screw, 39 is a bolt, 40 is a bracket, 50 is a fourth
This is the gear shaft of the gear 18. In this embodiment, the frame block C is usually assembled and assembled into the case 26, and the case
The opening of 26 is covered, and screws 35 are inserted from the outside of the case 26 to fix the frame block C to the case 26 for assembly. In this embodiment, since the assembly direction of the parts other than the motor 19 is the same in the assembly of the frame block C, the assembly can be easily automated as compared with the conventional example. Is not easy to automate, and it is also difficult to perform this operation following the assembly of the frame block C, so that the entire assembly could not be easily automated. [Object of the Invention] The present invention has been made in view of such circumstances, and an object of the invention is to provide an hour meter capable of easily performing assembly automation. DISCLOSURE OF THE INVENTION In order to achieve the above object, the present invention provides a case having a time display window, in which a shaft and a motor through which a dial is rotatably inserted are housed, and A timepiece in which a main plate on which a power transmission means for transmitting a driving force to the character wheel and rotating the character wheel is also housed, and the character of the character wheel appears from the time display window, The case is composed of a member having a time display window and a member fitted therewith, and the shaft, the motor and the main plate are sandwiched and fixed between the two members, and the power transmission means includes a transmission unit. A switching lever for switching the speed, the switching lever having a tip projecting out of the case from an opening provided in the case and blocking a convex portion blocking the opening from the back. Preparation The gist of the present invention is characterized in that the main plate is provided with a convex portion that abuts the convex portion so as not to hinder the operation of the switching lever and closes the opening together with the convex portion. . Hereinafter, the present invention will be described in detail. FIGS. 1A and 2B show a first embodiment of a time meter according to the present invention. As shown in the figure, this embodiment includes a case composed of two members, a lower case 56 and an upper case 57 that is fitted to the lower case 56. The lower case 56 has a structure in which walls are protruded from both sides and a front end of the bottom wall as a whole, a time display window 56a is provided on the front surface, and cutouts 56b, 56c, and protrusions are provided on both sides. Part 56d, 5
6e is provided. The front sheet 25 is applied to the front surface of the lower case 56. The upper case 57 has a structure in which downward wall portions are protruded at both ends and a rear end of the ceiling wall as a whole, and a cutout 57a is provided on a rear surface, and through holes 57b, 57c is provided. The lower case 56 and the upper case 57 are fitted together so that the projections 56d, 56e are inserted into the through holes 57b, 57c, and are fixed to each other. In both cases 56 and 57, a first character axle 6a, a second character axle 6b, a motor 19 and a main plate 11 are housed. First character axle 6a
A predetermined number of hour wheels 2 and a drive hour wheel 5 are rotatably inserted into the second wheel axle 6b, and a predetermined number of pinions 3 are rotatably inserted into the second wheel axle 6b. Both ends of the first character axle 6a and the second character axle 6b are inserted into the notches 56b and 56c, and are fixed by being pressed by the upper case 57. On the main plate 11,
The Hertz switching lever 20 is slidably supported, and the second gear 10, the third gear 24, the fourth gear 9 and the fifth gear 8
Are rotatably supported. On the Hertz switching lever 20, a first planetary gear 23 and a second planetary gear 22 are rotatably supported. The main plate 11 and the motor 19 are
It is sandwiched and fixed by 6,57. When the motor 19 rotates, the gear 19a provided on the shaft of the motor 19 rotates,
The second gear 10, the planetary gear 22 or 23, the third gear 24, the fourth gear 9, and the fifth gear 8 rotate sequentially. The second gear 10, the planetary gears 22, 23, the third gear 24, the fourth gear 9, and the fifth gear 8
The rotation of the motor 19 is transmitted at a reduced speed. 5
The number wheel 8 rotates the drive wheel 5, and when the drive wheel 5 makes one rotation, the pinion 3 combined with the wheel rotates the adjacent wheel 2 by one character to perform a digit shift. The other character wheel 2 is also configured to rotate by one character by the pinion 3 combined with the character wheel 2 adjacent to the driving character wheel 5 when it makes one rotation. The characters displayed by the driving wheel 5 and the wheel 2 can be seen from the display window 56a. The Hertz switching lever 20 engages either the first planetary gear 23 or the second planetary gear 22 with the second gear 10 according to the frequency of the power of the motor 19. In the figure, 21 is a mounting spring, and this mounting spring 21
It is used for fixing the upper and lower cases 56 and 57 to the strong panel. This time meter is assembled, for example, as follows. First, the hand wheel 2 and the drive wheel 5 are passed through the first wheel axle 6a, the pinion 3 is passed through the second wheel axle 6b, and both ends thereof are inserted into the cutouts 56b and 56c of the lower case 26. Next, the motor 19, the base plate 11, the fifth gear 8, the second gear 10, the hertz switching lever 20, the second planetary gear 22, the first planetary gear 23, and the fourth gear 9,3
Combined in the order of the number gear 24. Finally, upper and lower case 5
The protrusions 56d and 56e are inserted into the through holes 57b and 57c with the 6 and 57 aligned, thereby fixing the upper and lower cases 56 and 57 to each other.
The above assembly can be easily performed by automatic assembly. The front sheet 25 is fixed to the front surface of the lower case 56 with an adhesive at first or after completion of the assembly. As described above, the hour meter according to the present invention has two cases, a lower case having a time display window and an upper case fitted thereto. The first and second character axles, the motor and the main plate are provided in the upper and lower cases. It is designed to be sandwiched and fixed, and the front panel, frame,
No screws are required to secure the frame to the case. For this reason, the assembling can be performed easily, and as in the above-described assembling example, the assembling directions of the members can be unified and the automatic assembling can be facilitated.
Further, since the frame is not fixed to the case with the screws, there is no problem that the screws are loosened and the frame rattles. As described above, this embodiment includes the Hertz switching lever that switches the transmission speed in accordance with the frequency of the power supply of the motor. As shown in FIGS. 1 and 3 (a) and (b), the hertz switching lever 20
The tip protrudes from an opening 51 formed by combining a with the notch 57a of the upper case 57. On both sides slightly closer to the base side from the end of the Hertz switching lever 20, there are convex portions 20a, 20 that block the depth of the opening 51.
a protrudes, and on both sides of the notch 11a of the main plate 11, convex portions 20a, 20a are provided so as not to hinder the swing of the hertz switching lever 20.
Protrusions 11b and 11c are provided so as to be in close contact with. The protrusions 20a, 11b, 11c cover the opening 51 so that dust and the like do not enter the inside of the hour meter. In the conventional time meter, as shown in FIG. 12 (a), a dust-proof sheet 31 is attached to the tip of the Hertz switching lever 20 as a separate part, thereby closing the opening 51 and dust-proofing. I was In contrast, in this embodiment, the hertz switching lever
Since dust is prevented by the projections 20a, 11b, and 11c integral with the base 20 and the base plate 11, the number of parts is reduced, assembly is simplified, and cost can be reduced. The protrusion 20a and the protrusions 11b and 11c do not necessarily need to be in close contact,
Some clearance may be provided. First planetary gear 23 and second planetary gear 22 provided on hertz switching lever 20
Is always engaged with the third gear 24. When the power of the motor is 50 Hz, the Hertz switching lever 20 is set to the position shown by the solid line in FIG. 3A, and the second planetary gear 22 and the second gear 10 mesh with each other. Second, the rotation of the second gear 10 is transmitted to the third gear 24 via the second planetary gear 22. When the power of the motor is 60 Hz, the position is indicated by a chain line, and the first planetary gear 23 and the second gear 10
And the rotation of the second gear 10 causes the rotation of the first planetary gear 23.
Through the third gear 24. The embodiment is different from the conventional hour meter shown in FIG. 12 in that, in addition to the front panel 32, the dust-proof sheet 31, the holding spring 15, the gear 18, the gear shaft 50, the screw 35, and the washer 33 are provided. Because of the reduction, the assembling is further simplified and is also suitable for automatic assembling. FIGS. 4A and 4B show a second embodiment of the hour meter according to the present invention. As shown in the drawing, this embodiment is different from the first embodiment in that the fifth gear 8 is supported at three places at both ends and a central portion. The remaining structure is the same as that of the first embodiment, and the same reference numerals as those in FIGS. 1, 2 (a) and 2 (b) and FIGS. 3 (a) and 3 (b) indicate the same parts. ing. The rear end of the fifth gear 8 is rotatably supported by being sandwiched between convex portions 57f and 57d provided on the upper case 57 and the base plate 11. An intermediate portion of the fifth gear 8 is rotatably received by a support portion 11e provided on the main plate 11, and a flange portion 8a provided at an intermediate portion of the fifth gear 8 is provided on the support portion 11e. It is inserted into the groove 11f. The front end of the fifth gear 8 is provided with a hole 8b provided on the front end face of the fifth gear 8 and a convex portion 56 provided on the back surface of the front wall of the lower case 56.
When h is inserted, it is rotatably supported. Since the fifth gear 8 of this embodiment is supported at the front end and the rear end, it is reliably supported, the meshing with the drive wheel 5 is stabilized, and the rotation of the fifth gear 8 is stabilized. The information is transmitted to the driving character wheel 5. Further, since the flange portion 8a is inserted into the groove 11f of the support portion 11e, the axial movement of the fifth gear 8 is prevented, and the rotation of the fifth gear 8 is more stably transmitted to the drive wheel 5. Can be The fifth gear 8 can be stably provided at least at the front and rear ends.
The effect of transmitting the rotation of the wheel to the drive character wheel 5 can be obtained. The fifth gear 8 performs a display during driving (rotation display), and six convex portions 8c are provided at equal intervals around a hole 8b on the front end surface. Convex portion 56h of front wall of lower case 56
, Five holes 56i are provided at equal intervals. When the fifth gear 8 rotates, the rotation of the convex portion 8c can be seen from the hole 56i, which indicates that the hour meter is being driven. If the color of the front end face of the fifth gear 8 is different from the color of the front wall of the lower case 56, it is easier to understand that the fifth gear 8 is rotating. As shown in FIG. 13, in the conventional time meter, the gear 8 for displaying during driving is normally supported at the rear end and the intermediate portion of the gear 8. The same applies to the hour meters shown in FIGS. 10 and 11, and the hour meters shown in FIGS. 12 (a) to 12 (d). Here, the support portion 53 of the sheet metal frame 53
The rear end of the gear 8 is supported by the a
The intermediate portion of the gear 8 is supported by the support portion 54a. This is a display unit that displays a display during driving at the front end of the gear 8.
This is because 8d is provided and is viewed from the frame 55 side, so that it is not particularly conceivable to support the front end of the gear 8. Therefore, since the tip of the gear 8 is not supported, the tip of the gear 8 moves, and the meshing between the gear 8 and the drive wheel 5 becomes unstable, and the rotation of the gear 8 is stably transmitted to the drive wheel 5. I couldn't do that. On the other hand, in the second embodiment, as described above, the fifth gear for displaying during driving is supported at the front end and the rear end. It is transmitted. In the conventional hour meter shown in FIGS. 10 and 11, a transparent front panel 32 is used, the fourth gear 8 for displaying during driving is white, and the fourth gear 8 is used.
Is marked in red by hot stamping on the front end surface of the, and a black mark is printed in a circle at a position corresponding to the front end surface of the fourth gear 8 of the front panel 32 in black. Display is performed. However, the position of the mark on the front panel 32 and the position of the front end face of the fourth gear 8 are displaced, so that the display during driving may be difficult to understand. on the other hand,
In the conventional hour meter shown in FIGS. 12 (a) to 12 (d), a transparent front panel 32 is provided with an aluminum front sheet 25 having a round hole. Thus, the display during driving is performed so that the unevenness of the tip surface of the sixth gear 8 for displaying during driving can be seen. However, the display during driving was still difficult to understand. On the other hand, in the second embodiment, since the front end of the fifth gear for performing the display during driving is supported as described above, a hole for the driving display on the front wall of the lower case is provided. The front end face of the fifth gear is not displaced, and the unevenness provided on the front end face of the fifth gear is made visible from the hole for displaying during driving of the front wall of the lower case. The rotation status is clearly understood, and the display during driving is easy to understand. In the conventional time meter shown in FIGS. 10 and 11, or in the conventional time meter shown in FIGS. 12 (a) to 12 (d), FIGS. Are used. The pinion 3 is provided with convex portions 3a and 3b on both sides along the axial direction, and A portions and B portions are provided alternately. In this pinion 3, the portion A should be engaged with the hour wheel, but it often happens that the portion B is erroneously engaged with the hour wheel so that the pinion 3 stops shifting. Further, since the difference between the heights of the protrusions 3a and 3b is small, it is often the case that the pinion 3 does not perform the digit feed when the left and right sides are combined with the character wheel. On the other hand, with the pinion used in the first and second embodiments, it is possible to prevent such a situation that shifting is not performed. FIGS. 5A and 5B show the pinion 3 used in the first and second embodiments. As shown in the drawing, this pinion 3 is provided with portions A and B alternately as in the conventional pinion. However, a notch 3c for positioning is provided in which an edge is cut out so that a set having one part A and one part B is provided, and a protrusion 3d is provided only on one side along the axial direction. The place provided is different. Since the pinion 3 is provided with the convex portion 3d on only one side, the left and right can be easily discriminated visually, and there is almost no possibility that the pinion 3 is combined with the character wheel with the left and right reversed. Even if wrongly combined, FIG. 6 (a)
As shown in FIG. 6B, as compared with the case where the pinion 3 and the character wheel 2 are normally combined, as shown in FIG. In the case of combination with the character wheel 2, the distance between the character wheels 2 becomes large, and the character wheel 2 protrudes from the predetermined length l after the combination, so that the character wheel 2 cannot be inserted into the lower case. It is easy to understand because of inconvenience. As shown in FIG. 7, when the pin 58 of the jig is applied to the notch 3c of the pinion 3 and the pinion 3 is combined with the character wheel 2 while positioning the pinion 3, the pinion 3 Part A can be reliably engaged with the character wheel 2. Therefore, with this pinion 3,
This eliminates the occurrence of such a situation that no shifting occurs. The hour meter may be provided with a zero return mechanism for returning the time display by the character wheel to zero. 15 (a) and 15 (b) show a conventional zero return mechanism. As shown in the figure, the zero return mechanism includes a heart cam 59, a heart cam lever 13, and an alignment spring 16. The heart cam 59 is provided on the hour wheel 2 and rotates with the hour wheel 2 about the first hour wheel shaft 6a. The heart cam lever 13 has a hook shape and swings around the second character axle 6b. The heart cam lever 13 is provided with a pinion shaft 7, and the pinion 3 is rotatably fixed to the pinion shaft 7. The base of the alignment spring 16 is fixed to the frame 1 by heat caulking, and the tip is located above the pinion shaft 7. This zero return mechanism is normally in the state shown in FIG. 15 (a). Push button (not shown) to perform zero return
Press the heart cam lever in the direction to raise the pinion 3.
When the pin 13 is rotated, as shown in FIG. 15 (b), the pinion 3 and the dial 2 are separated from each other, and the engagement between them is released. Then, the lower end of the heart cam lever 13 hits the heart cam 59, and the dial 2 is rotated and fixed via the heart cam 59 to a rotation position where 0 appears on the display window. On the other hand, in the pinion 3, the alignment spring 16 hits the convex portion 3 b having a square cross section provided on the side portion, and the alignment spring 16 is aligned with one of the four side surfaces of the convex portion 3 b by the spring force of the alignment spring 16. , At a predetermined rotational position. When the pressing of the push button is released, the heart cam lever 13 returns to the original position by the return spring (not shown) as shown in FIG. 15 (a). Then, the pinion 3 and the character wheel 2 mesh with each other again. When the heart cam lever 13 returns to the original position, the alignment spring 16 is disengaged from the pinion 3 by the time the pinion 3 engages with the hour wheel 2, so that the alignment spring 16 is disengaged from the pinion 3. In some cases, the rotational position of the pinion 3 is shifted due to vibration or the like, and the engagement between the pinion 3 and the dial 2 becomes poor. FIGS. 8 (a), (b) and FIG. 9 show a third embodiment provided with a zero return mechanism that does not cause a possibility that the meshing between the pinion 3 and the dial 2 becomes defective. In this embodiment, as shown in the drawing, a drive wheel 5 having no character portion is used in place of a drive wheel in addition to a zero return mechanism, and a drive pinion which does not perform a shift operation as one of the pinions. Except for using No. 4, the structure is almost the same as that of the first and second embodiments. Therefore, also in this embodiment, automation of assembly can be easily performed. 8 (a), (b) and FIG. 9, the same reference numerals as those in FIGS. 1 to 4 indicate the same parts. The zero return mechanism is similar to the above-mentioned conventional one.
A heart cam 59, a heart cam lever 13, and an alignment spring 16 are provided. The heart cam 59 is provided on the hour wheel 2 and rotates together with the hour wheel 2 about the first hour wheel shaft 6a. The heart cam lever 13 has a hook shape and swings around the second character axle 6b. The heart cam lever 13 is provided with a pinion shaft 7.
Is rotatably fixed to the shaft. However, the alignment spring 16 is provided on the heart cam lever 13, the alignment spring 16 is always in contact with the projection 3b of the pinion 3, and the base plate 11 is provided with a projection 11h for pinion alignment. Is different. This zero return mechanism operates as follows. This zero return mechanism is usually in a state shown by a solid line. Push button (not shown) to perform zero return
Press the heart cam lever in the direction to raise the pinion 3.
When the 13 is rotated, the pinion 3 and the character wheel 2 are separated from each other, as shown by the dashed line, and the meshing between them is released. Then, the lower end of the heart cam lever 13 hits the heart cam 59, and the dial 2 is rotated and fixed via the heart cam 59 to a rotation position where 0 appears on the display window. On the other hand, the pinion 3 has a convex portion due to the spring force of the alignment spring 16.
An alignment spring 16 is aligned with one of the four side surfaces of 3b, and is aligned at a predetermined rotational position. Because the spring force of the alignment spring 16 is weak, the projection 3b
There is a risk that the corners of the projections may hit the alignment spring 16 and stop at the center, but the projection 11h presses the projection 3b via the alignment spring 16 to supplement the spring force of the alignment spring 16. , Pinion 3 is reliably aligned. When the push button is released, a return spring (not shown) causes the heart cam lever
13 returns to its original position as shown by the solid line.
Then, the pinion 3 and the character wheel 2 mesh with each other again. In this zero return mechanism, the alignment spring 16 is kept in contact with the convex portion 3b even when the heart cam lever 13 returns to the original position, so that the rotation position of the pinion 3 is changed by the time the pinion 3 As a result, the engagement between the pinion 3 and the character wheel 2 does not become poor. [Effects of the Invention] A time meter according to the present invention includes a case having a time display window, a shaft through which a character wheel is rotatably passed, and a motor, and a driving force of the motor being transmitted by the character shaft. A time plate in which a main plate on which a power transmission means for transmitting and rotating this is arranged is also stored, and the character of the character wheel is made to appear from the time display window, wherein the case is a time display window. Since the shaft, the motor, and the main plate are fixed by being sandwiched between both members, the assembly can be easily performed. it can. Further, the power transmission means includes the switching lever and the base plate having the above-described configuration, and the convex portion integrated with the switching lever and the base plate can reliably achieve dust prevention at the opening with a simple structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a first embodiment of an hour meter according to the present invention, FIGS. 2 (a) and (b) and FIGS. 3 (a) and 3 (a).
FIG. 4B is an explanatory view of the internal structure of the embodiment, and FIGS.
(B) is an explanatory view of the internal structure of a second embodiment of the hour meter according to the present invention. FIG. 5 (a) is a partially cutaway side view of a pinion used in the first and second embodiments. 6 (b) is a front view of the pinion, FIG. 6 (a) is an explanatory view of a state in which the pinion and the character wheel are normally assembled, and FIG. 6 (b) is one of the pinions in error. FIG. 7 is an explanatory view of a state combined with a character wheel, FIG. 7 is an explanatory diagram of a combination process of the pinion and the character wheel, and FIGS. 8 (a) and (b) are diagrams of a third embodiment of a time meter according to the present invention. FIG. 9 is an explanatory view of an internal structure, FIG. 9 is an explanatory view of a zero return mechanism of a third embodiment, FIG. 10 is a partially cutaway perspective view of a conventional hour meter, FIG. 11 is a perspective view of a frame block of the hour meter, FIG. 12 (a) is a partially cutaway front view of another conventional time meter, FIG. 12 (b) is a partially cutaway plan view of the same time meter, and FIG. FIG. 13 (d) is a right side view of the hour meter without the front panel of the hour meter, FIG. 13 is an explanatory view of a gear supporting structure for displaying during driving in the conventional hour meter, FIG. 14 (a) is a partially cutaway side view of a conventional pinion, FIG. 14 (b) is a front view of the same pinion, and FIGS. 15 (a) and (b) are structural explanatory views of a conventional zero return mechanism. is there. 2 ... Character wheel, 5 ... Drive character wheel, drive vehicle, 6a ... First
Character axle, 8, 9, 10, 19a, 24 ... gear, 11 ... main plate, 19 ...
... Motor, 56 ... Lower case, 56a ... Time display window, 57 ...
… Upper case

   ────────────────────────────────────────────────── ─── Continuation of front page    (56) References JP-A-51-37559 (JP, A)                 Actual opening 1983-30895 (JP, U)                 Shokai Sho 59-68212 (JP, U)                 Japanese Utility Model Showa 57-157953 (JP, U)                 Shokai Sho 59-60594 (JP, U)                 Tokiko Sho 53-39302 (JP, B2)

Claims (1)

(57) [Claims] In a case having a time display window, a shaft through which the dial is rotatably inserted and a motor are housed, and power transmission means for transmitting the driving force of the motor to the dial and rotating the same is arranged. The time plate is also stored, and the character of the character wheel is made to appear from the time display window, wherein the case comprises a member having a time display window and a member fitted thereto. Wherein the shaft, the motor and the main plate are fixed by being sandwiched between the two members, and the power transmission means includes a switching lever for switching the transmission speed, and the switching lever A projection protruding out of the case from an opening provided in the case and blocking the opening from the back thereof. Hour meter, wherein a convex portion is provided in contact with the convex portions on the convex portion closes the opening. 2. 2. The time meter according to claim 1, wherein the power transmission means includes a rod-shaped gear for performing rotation display during driving, and the gear is rotatably supported at at least both ends. . 3. The character wheel is provided with a pinion for rotating the other character wheel at a predetermined rate according to the rotation speed of one of the adjacent character wheels, and the pinion is provided with a notch for positioning in a peripheral portion. 3. The hour meter according to claim 1, wherein the hour meter is provided with a convex portion protruding in the axial direction only on one side. 4. The character wheel is provided with a pinion for rotating the other character wheel at a predetermined rate according to the rotation speed of one of the adjacent character wheels, and a character that appears in a time display window of the character wheel is provided. The return means is provided with a lever for removing the pinion from the wheel and returning the wheel to a predetermined rotation position, and the lever rotates the pinion for a predetermined rotation by a spring force. 3. The hour meter according to claim 1, further comprising a spring that stops at a position.