JPH0346448Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The present invention is a specification switching device for an electronic timer, such as a time scale, time units such as hours, minutes, and seconds, and operation modes such as time-limited operation and instantaneous action and time-limited return. This relates to a device that switches specifications such as.

<<Prior Art and its Problems>> Conventionally, a single electronic timer has been provided with a plurality of functions by switching an internal circuit having a plurality of time specifications from the outside. This switching method involves changing the internal circuit with a switch to change the time specifications, and replacing the scale plate according to the time specifications, or by inserting a key displaying the time specifications into the timer body. One possible method is to operate the internal circuit to switch the internal circuit.

However, all of the above systems require the preparation of multiple scale plates or keys, which makes parts management troublesome.Moreover, a large number of switches must be provided depending on the number of specifications.
The disadvantage was that it was expensive and the front part of the timer was thick.

《Purpose of the invention》 The present invention was devised in view of these conventional drawbacks.The purpose of the invention is to eliminate the need for accessories such as multiple scale plates and keys, and to easily change the operating mode by rotating a knob. To provide a thin and inexpensive electronic timer specification switching device that can be switched to .

《Structure and Effects of the Invention》 In order to achieve the above object, the present invention provides a gear box on the front part of the timer body, stores the gear for specification switching compactly in this gear box, and also connects the gear box with the print. The display part installed on the front of the gear is displayed through the display hole on the front nameplate of the gear box, and the gear for changing the operation specifications is linked to the rotating operation of the knob to display the gear intermittently. It was designed so that it could be rotated.

That is, according to the present invention, a gear for specification switching is housed in a gear box, and a switch slider attached to this gear is brought into sliding contact with a contact pattern of a printed circuit board attached to the rear side of the gear box. Since the specifications are switched, there is no need to provide a switch as in the past, and the specification switching mechanism can be constructed thin and at low cost. Also,
Since a specification display section is provided on the front surface of the gear and this display section is exposed through the display window of the nameplate, accessories such as multiple scale plates and keys are not required. Furthermore, since the gear box and the board are integrated into a block, it has the advantage that it is easy to assemble with other mechanical parts such as the base and the board attached to the base, and one display gear can be used as a knob. Since the mode can be switched in conjunction with the rotational operation of the switch, it has excellent effects such as easy mode switching.

<<Description of Embodiment>> The present invention will be described below based on an illustrated embodiment. 1 to 4, 1 is a cylindrical case constituting the timer body, 2 is a base in which a large number of octal pins 3 are implanted, and the protrusion 2a of the base 2 is engaged with the engagement hole 1a of the case 1. By this,
The base 2 is adapted to be fixed within the case 1. 4 is a printed circuit board that is closely fixed to the inner surface of the base 2; 5 and 6 are printed circuit boards that are fixed at right angles to the base 2;
5 and 6 are electrically coupled to each other. Also,
Engagement holes 5a, 6 are provided in the front parts of the printed circuit boards 5, 6.
a (6a not shown) is formed, and by fitting protrusions 7a and 7b formed on the upper and lower parts of another printed circuit board 7 into this engagement hole and soldering them, the printed circuit boards 5, 6, 7 are electrically and mechanically coupled.

A sliding resistor 8 is provided at the center of the front surface of the printed circuit board 7, and a slider storage member 10 is arranged so that the slider 9 is always in sliding contact with this sliding resistor.
is rotatably attached to the printed circuit board 7. Further, on the front outer circumference of the printed circuit board 7, one operation display element 15 and three support holes 16, 18,
20 and around each support hole, contact patterns 17, 19, and 21 for switching each specification are provided. That is, the contact pattern 17 on the upper right shown in the figure switches the operation mode such as time-limited operation, instantaneous operation, time-limited return, and repeat operation, and the contact pattern 1 on the lower right
Reference numeral 9 is used to switch time units such as hours, minutes, and seconds, and contact pattern 21 at the lower left is used to switch time scales.

Gear boxes 30 made of resin are arranged at regular intervals on the front side of the printed circuit board 7, and holding pieces 31 protruding rearward from both sides of the gear box are engaged with the recesses 22 on both sides of the printed circuit board 7. By matching them together, the gear box 30 and the printed circuit board 7 are connected and integrated. Gearbox 30
A knob shaft 33 is rotatably fitted into the central hole 32 of the knob shaft, and a protrusion 3 protruding from the rear surface of the knob shaft
4 is engaged with the slider housing member 10, the knob shaft 33 and the slider housing member 10 rotate integrally.

In the figure, reference numeral 36 denotes a switch gear which also serves as an operation mode display gear, and the rear part of the switch gear 36 passes through the gear box 30 and fits into the support hole 16 of the printed circuit board 7, and is rotatably supported. A wave-shaped disc-shaped switch slider 40 is engaged with and held on the rear end surface of the switch gear 36, and this switch slider is in pressure contact with the contact pattern 17. Four ratchet teeth 44 are formed on the rear outer surface of the switch gear 36, and these ratchet teeth engage with ratchet pawls 45 formed on the gear box 30 to be positioned every 90 degrees. Furthermore, four letters A, B, C, and D (specification display section) are printed on the front surface of the switch gear 36. This switch gear 36 has toothed portions 3 on a part of its outer circumferential surface which are fitted into the knob shaft 33 and rotate integrally therewith.
It rotates intermittently within a predetermined setting range by an intermittent feed section 37 having a section 7a, and the operation mode can be switched in conjunction with the rotation of a knob, which will be described later.

Furthermore, in the figure, 46 is an input gear for time unit switching, 47 is a switch gear that meshes with this input gear, and this switch gear 47 has exactly the same shape as the operation mode switch gear 36 described above. That is, a switch slider 48 that slides on the contact pattern 19 is attached to the switch gear 47, and ratchet teeth 50 that engage with the ratchet pawl 49 of the gear box 30 are formed. A display gear 51 that meshes with the switch gear 47 is disposed on the side of the switch gear 47, and four time units (specification display portions) are printed on the front surface of the display gear 51.

In addition, 52 in the figure is an input gear for switching the time scale;
53 is a switch gear that meshes with this input gear,
A switch slider 54 is attached to the switch gear 53 and is in sliding contact with the contact pattern 21 in the same way as the switch gear 36 which also serves as an operation mode display gear. A deceleration tooth 53a is integrally protruded from the center of the upper surface of the switch gear 53, and elastic teeth 55 are provided on the outer periphery to prevent rotation beyond a certain angle. Even if a driving force is applied from the input gear 52, the elastic teeth 55 escape inward, so that the driving force is not transmitted. A display gear 56 with a time scale (specification display section) printed on the front surface is rotatably housed in the center of the gear box 30, and the meshing teeth 57 of this display gear 56 are connected to the switch gear 53.
The ratchet teeth 58 of the display gear 56 engage with the ratchet pawls 59 formed on the gear box 30, and are positioned at predetermined pitches. In addition, a notch 60 is formed on the upper outer periphery of the display gear 56, and both sides of this notch abut against a convex portion 61 protruding from the gear box 30, so that the second display gear 56 is rotated at a certain angle ( For example 40
It is designed so that it can be rotated by a certain degree.

Furthermore, 62 in the figure is a lamp cover, which is fitted into a hole formed in the upper left part of the gear box 30.
It corresponds to the operation display element 15 provided on the printed circuit board 7. 63 is fitted into the gear box 30,
This is a transparent sheet that covers the front of the gearbox. 6
4 is a name plate attached to the outside of the transparent sheet, which has a hole 65 in the center from which the knob shaft 33 protrudes, and around this hole a scale 66 and six time scale display windows 6.
7 and one time unit display window 68 are formed. In addition, the input gear 4 is located around the nameplate 64.
Holes 70 and 71 through which the tip surfaces of the lamps 6 and 52 are exposed, a hole 72 through which the lamp cover 62 is exposed, and an operation mode display window 73 are formed. The time scale display window 67 corresponds to the time scale of the display gear 56,
The time unit display window 68 corresponds to the time unit of the display gear 51, and the operation mode display window 73 corresponds to the characters of the switch gear 36. Note that grooves 46a and 52a are formed on the tip surface of each input gear, and by engaging a jig such as a screwdriver with these grooves and turning the input gear, it is possible to switch between the time unit mode and the time elapsed mode. It's becoming like that.

On the other hand, reference numeral 74 in the figure is a time setting knob, and a pointer 75 is attached to the inner surface of this knob. is fixed to the knob shaft 33. At this time, the outer peripheral end face of the knob 74 is pressed against the nameplate 64 by the tightening force of the mounting screw 77, but the outer peripheral end face of the knob 74 is just the center of the axis 36a, 47a of the switch gears 36, 47, 53, 53b, each switch gear is pushed rearward via a nameplate 64. Therefore, switch sliders 40, 48, 54 attached to the rear end surfaces of switch gears 36, 47, 53
are the contact patterns 17, 19, 2 of the printed circuit board 7
1, and the contact stability of the contacts is good.

Here, the operation of the electronic timer specification switching device having the above configuration will be explained.

First, by rotating the knob 74, the knob shaft 3
3 rotates the intermittent feed section 37 that is linked to the operation mode display gear to rotate the switch gear 36 which also serves as an operation mode display gear, while each input gear 46 and 52 is rotated by a jig such as a screwdriver to rotate the name plate 64. For example, as shown in FIG. 2, "A", "10h", and numbers from "0" to "0.5" are displayed on each of the display windows 73, 68, and 67. As a result, the switch slider 4 attached to each switch gear 36, 47, 53
0, 48, 54 are contact patterns 17, 19, 21
Slide the top to switch specifications. In addition. Since each switch gear is prevented from rotating by the engagement between the ratchet teeth 44, 50, 58 and the ratchet pawls 45, 49, 59, it can freely move unless the input gears 46, 52 are forcibly rotated using a jig. There is no need to worry about the specifications changing. Next, after setting the operation mode, by turning the knob 74 again to the desired time scale, the slider storage member 10 also rotates together with the knob, and the slider 9 stored in this slider storage member is rotated. It slides on the sliding resistor 8 and is set to a desired resistance value. This completes the time setting.
By turning on the power, this electronic timer operates according to the set specifications.

In the above embodiment, in addition to the operation mode, a gear group is housed to switch between three types of specifications: time unit and time scale, but it may also be possible to switch only one of the specifications. As a switching method, the switch gear is rotated by turning the input gear with a screwdriver or the like, but the input gear may be omitted and the switch gear or the display gear can be directly rotated with a screwdriver or the like. Furthermore, instead of rotating these gears with a jig such as a screwdriver, it is also possible to alternatively rotate the switch gear by rotating a knob in the same way as the gear in the operation mode.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of the electronic timer specification switching device according to the present invention, Figure 2 is an exploded perspective view of this electronic timer, Figure 3 is a sectional view of its main parts, and Figure 4 is a state with the name plate removed. FIG. 1... Case, 2... Base, 7... Printed circuit board, 17, 19, 21... Contact pattern, 30
... Gear box, 33 ... Knob shaft, 46,5
2...Input gear, 36, 47, 53...Switch gear, 37...Intermittent feed section, 37a...Tooth section, 4
0,48,54...Switch slider, 51,56
... Display gear, 64 ... Nameplate, 67, 68, 73
...display window.

Claims (1)

[Scope of utility model registration request] A gear box is installed on the front side of the timer body, which rotates the slider storage material together with a time setting knob, and a gear box is installed on the rear side of the gear box.
a printed circuit board having a contact pattern for switching specifications; a display gear that is rotatably housed in the gear box and has a specification display section on the front; and a display gear that is integrated with or interlocks with the display gear and that is connected to the gear box. a switch gear provided with a ratchet tooth for engaging with a ratchet pawl formed in the gear to prevent changes in setting specifications; a switch slider attached to the switch gear and sliding on the contact pattern of the printed circuit board; A name plate is installed so as to close the front side of the gear box, and has a display window through which the specification display section of the display gear is exposed, and the switch gear of the specification switching section is rotated together with the time setting knob. 2. An electronic timer specification switching device, characterized in that the electronic timer specification switching device is linked to an intermittent feed portion having teeth formed on a part of its outer peripheral surface to mesh with the switch gear.