JPH0218910Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a two-speed timer having two transmission paths.

[Prior art] As a conventional two-speed timer, for example,
-As in Publication No. 158545, a pair of upper and lower sliding gears is attached to one of the two spindles to form the intermediate part of the reduction mechanism, while a clutch gear rotatably attached to the clutch lever is attached to the other spindle. The two upper and lower reduction gears can be simultaneously engaged and disengaged based on the rocking of the clutch lever, and when the clutch gear is disengaged from the reduction gear, the rotation of the motor is controlled by the pair of sliding gears attached to the main shaft. It has been proposed that the rotational speed of the main gear differs depending on the transmission system of the two transmission systems, but when the rotation of the upper sliding gear is faster than the rotation of the lower sliding gear, the rotation speed of the main gear is transmitted to the main gear. The upper sliding gear is moved up and down each time, and there is a drawback that a falling sound is produced each time, and the clutch gear must be engaged with two gears at the same time, making adjustment difficult.

[Purpose of invention]

In view of the above-mentioned drawbacks, the present invention proposes a two-speed timer with a simple configuration and no falling sound.

[Structure of the idea]

The present invention provides a two-speed timer that transmits output from a motor to a time set shaft via a reduction gear train having two different transmission paths, in which a gear part and a pinion part are integrated in the reduction gear train. A first gear coupled by a directional clutch, a second gear coaxial with this gear and rotatable independently, and either one of the gear part or the pinion part and the second gear. A third gear that is always in mesh with the other of the gear part or the pinion part and the second gear by the switching means,
and a fourth gear that moves in thrust relative to each other and selectively engages with each other, and the fourth gear is moved in the thrust direction by the switching means to select the other of the gear section or the pinion section. or a first transmission path that selectively meshes the second gear and the fourth gear and transmits the output from the third gear to the fourth gear via the second gear; and a first transmission path that transmits the output from the third gear to the fourth gear via the first gear and a second transmission path having a different reduction ratio. That's what I did.

〔Example〕

Hereinafter, the present invention will be explained with reference to an illustrated embodiment. 2
The speed timer is case 1 in Figures 1 to 3.
A gear part 2 and a pinion part 3 are attached to the shaft part 1a formed in the
A first gear connected by a one-way clutch is fitted and urged by a coil spring 10, and a second gear 4, which is rotatable coaxially and independently of this gear, is fitted, and the case 1 and the lid are connected together. A third gear 5 is fitted onto the shaft 12 supported by the shaft 11 . This third gear 5 includes either the gear portion 2 or the pinion portion 3, that is, in the case of this embodiment, the gear portion 2
are always in mesh with each other, and are also in constant mesh with the second gear 4. Further, a fourth gear 6 is fitted onto the other shaft 13, is biased by a coil spring 14, and is pressed into contact with a cam gear 9 which is a switching means to be described later. The fourth gear 6 is connected to the other of the gear part 2 or the pinion part 3, that is, in the case of this embodiment, the pinion part 3 and the second gear 4 by means of a cam gear 9 which is a switching means. However, it can be thrust-moved relative to the pinion portion 3 or the second gear 4 and can be selectively engaged with the pinion portion 3 or the second gear 4.
The third gear 5 is meshed with an output gear 19 of the motor via a coaxial Geneva gear 15 and reduction gears 17 and 18 fitted on another shaft 16.

The pinion 6a of the fourth gear 6 includes a pinion 21 fitted to the shaft 20, a holding plate 22, and a spring plate 2.
The output gear 7 is engaged with the pinion 21, and the output gear is press-fitted onto the time set shaft 25.
The pinion 21 is configured to slip when the output gear 7 is rotated by an external force for time setting, and to transmit the rotation to the output gear 7 when the motor rotates during timer operation.

The tooth portion 6b of the fourth gear 6 is formed into a special tooth profile with a step on one side of the tooth as shown in FIG. When it is engaged with the gear 4 and the rotation of the output gear 19 of the motor is transmitted, it is rotated and the time set shaft 25 is rotated.
The fourth gear 6 is formed in a special tooth profile such that rotation is not transmitted to the pinion portion 3 or the second gear 4 when the fourth gear 6 is rotated.

On the back side of the output gear 7, there are two teeth 7a and a valley 7b at one location on the outer periphery as shown in FIGS. 1, 3, and 4.
A locking disk 7c and an annular notch 7d whose height is, for example, 2/3 of the thickness of the valley 7b are formed, and the small gear 8 of the idler gear 8 is formed in the toothed portion 7a and the valley 7b.
The idler gear 8 is fitted into the shaft portion 1b formed in the case 1, and the large and small gears 8b,
8a, and the small gear 8a has a high tooth portion 8.
c and a short tooth portion 8d, and when the output gear 7 rotates and the short tooth portion 8d is fed by the tooth portion 7a, the high tooth portion 8c enters the valley 7b, and the gear 8 is fed by one tooth, and the high tooth portion 8c is formed. When the locking disk 7c comes out of the valley 7b, the two high toothed portions 8c, 8c straddle the outer periphery of the locking disk 7c, forming an intermittent feeding mechanism in which the gear 8 remains stationary while the output gear 7 rotates.

The large gear 8b is meshed with the cam gear 9 as shown in FIG. 3, and the cam gear 9 is fitted into the shaft portion 1c formed in the case 1 as shown in FIGS. A high surface 9b, a low surface 9c, and an inclined surface 9d are formed around the upper surface of the circular arc hole 9a, as shown in FIGS. 3 and 5, and the fourth gear 6 is mounted thereon. A switching means is configured that slides up and down upon contact.

A cam 26 is fitted to the time setting shaft 25 on the lower side of the output gear 7, and the rotation is interlocked with the protrusion 7c of the output gear 7 with play, thereby moving a contact piece (not shown).

The gear portion 2 and pinion portion 3 of the first gear have a plurality of protrusions 2a formed on the lower surface of the gear portion 2 as shown in FIGS.
Sawtooth teeth 3a are formed in a direction in which rotation from the side is transmitted to the pinion portion 3, and are mounted on the second gear 4.

In the two-speed timer, FIGS. 1 to 3 show the first transmission path through which the rotation of the output gear 19 of the motor is transmitted from the third gear 5 to the fourth gear 6 via the second gear 4. In the high-speed gear train state, the contact point (not shown) is turned off and the dial (not shown) is at the "0" stop position, and for example, the angle range from 0° to 200° is a short time range of 10 minutes, and the angle from 200° to 200°.
The 300° range consists of slow and long time ranges ranging from 10 minutes to 60 minutes. In the long-term range, when the time set shaft 25 is rotated approximately 200 degrees from the stop position, the teeth 7a of the output gear 7 mesh with the small gear 8a of the idler gear 8, rotating the large gear 8b. The cam gear 9 is rotated and the fourth gear 6 is slid upward to move from the third gear 5 to the gear portion 2 of the first gear.
and a second transmission path of the low-speed side wheel train at a different reduction ratio from the first transmission path through which the rotation of the output gear 19 of the motor is transmitted to the fourth gear 6 via the pinion section 3. It has been switched.

The operation of the above-mentioned two-speed timer is a time limit setting, and when the time set shaft 25 is rotated clockwise within an angle range of 200 degrees, a short time limit setting is performed, and the thrust position of the fourth gear 6 is set as shown in FIG. As shown by the solid line, on the lower side, the fourth gear 6 meshes with the second gear 4, and the rotation of the output gear 19 of the motor is transmitted to the output gear via the first transmission path of the high-speed side wheel train. 7
is transmitted to. Further, the rotation transmitted from the third gear 5 to the gear portion 2 of the first gear to the pinion portion 3 is not transmitted to the next gear, so it rotates idle.

Next, the time set axis 25 is rotated clockwise, for example, by an angle.
If it is rotated by 250 degrees, a long time limit setting will be made as described above, and the thrust position of the fourth gear 6 will first be set to the first position.
As shown by the two-dot chain line in the figure, it is on the higher side where it meshes with the pinion part 3. The rotation of the output gear 19 of the motor is transmitted to the output gear 7 via the second transmission path of the low-speed side gear train, and the rotation transmitted from the third gear 5 to the second gear 4 is transmitted to the second gear 4. It is colored by 4.

In the above state, when the motor is further rotated and the tooth portion 7a of the output gear 7 rotates the small gear 8a of the idler gear 8, and the cam gear 9 is rotated, the fourth gear 6 is rotated.
is slid to the lower side, and on the way, the fourth gear 6 becomes in mesh with both the pinion part 3 of the first gear and the second gear 4, and the pinion part 3 engages with the part between it and the gear part 2. Due to the directional clutch mechanism, it rotates faster than the gear part 2 and enters a relief state. Fourth
After the gear 6 and the pinion part 3 are disengaged, the transmission is completely carried out through the first transmission path of the high-speed side wheel train.

When the time setting shaft 25 is rotated clockwise during the above time setting, the external force is applied to the one-way clutch between the gear section 2 and the pinion section 3 of the first gear in the transmission direction. , the friction between pinion 21 and gear 24 functions. Also, when the time set shaft 25 is rotated in the return direction, the gear section 2
A force is applied to the pinion part 3 in the escape direction, but the tooth profile of the tooth part 6b of the fourth gear 6 in the preceding stage is a special tooth profile as described above and has a shape that does not transmit rotation, so it is similar to the former case. The friction between the pinion 21 and the gear 24 functions.

Note that if this special tooth profile cannot be adopted due to structural or cost issues, the tooth profile of the tooth portion 6b may be a normal tooth profile, and the sliding torque of the gear portion 2 and pinion portion 3 may be reduced by a friction force using a coil spring 10. It is also possible to make the above-mentioned friction function by setting the torque to be larger than the torque.

When the two-speed timer is configured as described above, the rotation of the output gear 19 of the motor is transmitted to the time setting shaft 25 via the first transmission path or the second transmission path, and the rotation of the output gear 19 of the motor is transmitted to the time setting shaft 25 through the first transmission path or the second transmission path, 2 and pinion part 3
The one-way clutch provided between the protrusions 2a is activated only when the fourth gear 6 is simultaneously engaged with the pinion portion 3 and the second gear 4 during vertical sliding movement. The time when the falling sound of the meshing of the serrated teeth 3a is produced is extremely short, and the difference in rotational speed at other times becomes a plane friction between the end faces of the pinion portion 3 and the second gear 4 and is not produced.

In the above description, the one-way clutch is constructed by the protrusion 2a and the serrated teeth 3a between the gear part 2 and the pinion part 3, but the one-way clutch may be constructed by a wound coil spring.

Also, I slid the fourth gear 6 up and down, but
The gear portion 2, pinion portion 3, and second gear 4 of the first gear may be configured to slide vertically.

[Effect of idea]

As described above, by moving the fourth gear in the thrust direction, the fourth gear can be connected to either the gear part or the pinion part, or the second gear.
By selectively meshing with the gears, the transmission path can be switched to a transmission path with a different reduction ratio.
Even if there is a difference in rotational speed between the rotating bodies such as the upper and lower gear parts and pinion parts of the one-way clutch, the time when the falling sound etc. is produced is only at the time when the fourth gear changes to move in the thrust direction. It is possible to provide a two-speed timer that can be used in an extremely short time and has excellent practical effects.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG.
Cross-sectional side view with speed timer expanded, 2nd
The figure is a plan view of the main parts of the timer in the same case, Figure 3 is a plan view of the main parts showing the lower half of the case, and Figure 4 is a plan view of the main parts of the timer inside the case.
The figure is a partial external perspective view of the locking disk and teeth of the output gear and the idler pinion, Figure 5 is an explanatory diagram of the high surface, inclined surface, and low surface of the cam gear, and Figure 6 is a diagram of the first gear. Cross-sectional side view A and bottom view B of the gear part,
FIG. 7 is a plan view (a) and a cross-sectional side view (b) of the pinion portion. 2, 3...first gear, 2...gear section, 3...
Pinion part, 2a, 3a... one-way clutch, 4
...Second gear, 5...Third gear, 6...Fourth gear
gear, 25... time set axis.

Claims (1)

[Scope of utility model registration request] In a two-speed timer that transmits the output from the motor to the time set shaft through a reduction gear train having two different transmission paths, the gear part and the pinion part are connected by a one-way clutch in the reduction gear train. a first gear coupled to the first gear; a second gear rotatable coaxially and independently of the first gear; either one of the gear section or the pinion section and the second gear;
a third gear that constantly meshes with the second gear; and a third gear that moves in thrust relative to the second gear and selectively meshes with the other of the gear section or the pinion section by means of a switching means. A fourth gear is provided, and the fourth gear is moved in the thrust direction by the switching means to connect the other of the gear part or the pinion part or the second gear and the fourth gear. a first transmission path that selectively meshes the output from the third gear to the fourth gear via the second gear, and a first transmission path that transmits the output from the third gear to the fourth gear; A two-speed timer characterized in that it is possible to selectively switch between the first transmission path and a second transmission path having a different reduction ratio, through which the output is transmitted to the fourth gear.