JPH0424586Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of the invention The present invention relates to a specification switching device for an electronic timer, for example, a device for switching specifications such as time scale numbers and time units such as hours, minutes, and seconds.

(b) Prior Art and its Problems Conventionally, electronic timers have been provided that have multiple functions in one unit by switching internal circuits having multiple 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, with all of the above, multiple scale plates or keys must be prepared, making parts management troublesome.Moreover, a large number of switches must be installed depending on the number of specifications.
In addition to being expensive, the front part of the timer was thick and large.

(c) Purpose of the invention The present invention was made in view of the above-mentioned drawbacks of the conventional technology.The purpose of the invention is to create a thin and compact device that does not require accessories such as multiple scale plates and keys, and that can be assembled automatically. An object of the present invention is to provide an inexpensive specification switching device for an electronic timer.

(d) Structure of the invention In order to achieve the above object, the invention consists of a case forming the timer body, a knob with a transparent front surface placed near the center of the front part of the case, and a knob in the center of the knob. A fixed knob shaft, a printed circuit board inside the case that is equipped with a circuit for outputting a signal according to the rotational position of the knob shaft, and a time unit and time scale numbers displayed through the front surface of the knob. a scale plate having a plurality of display windows for displaying the display; an input gear located in front of the printed circuit board and operated from outside the case to change the display of the display window; and a contact member. A switch gear located inside the case and located behind the scale plate and in front of the printed circuit board and driven by the input gear, and a switch gear provided on the printed circuit board and configured to drive the time unit and the time unit selected by the input gear. It is composed of a member for generating a signal corresponding to a time scale depending on the relationship with the contact member, and a gear driven by the switch gear to change the display.

(e) Description of the embodiment In the drawings, 1 is a cylindrical case constituting the timer body, 2 is a base in which a number of connection pins 3 are implanted, and the protrusion 2a of the base 2 is connected to the engagement hole 1a of the case 1.
By engaging with the base 2, the base 2 is fixed within the case 1. A printed circuit board 4 is closely fixed to the inner surface of the base 2, and is electrically connected to the connection pins 3. Reference numerals 5 and 6 denote printed circuit boards fixed at right angles to the base 2, and these printed circuit boards 4, 5, and 6 are electrically coupled to each other. Further, engagement holes 5a, 6a (6a not shown) are formed in the front parts of the printed circuit boards 5, 6, and another printed circuit board 7 is formed in the engagement holes.
Fit the protrusions 7a and 7b formed on the upper and lower parts of the
Moreover, the printed circuit boards 5, 6, and 7 are electrically and mechanically coupled by soldering.

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, 21 for specification switching are provided.

That is, the contact pattern 17 on the upper right is for switching operation modes such as time-limited operation, instantaneous action, time-limited return, and repeated operation, and the contact pattern 19 on the lower right is for switching time units such as hours, minutes, and seconds. The lower left contact pattern 21 is for switching the time scale.

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 inserted into the recesses 22 on both sides of the printed circuit board 7. By engaging them, 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 are rotated together. The gear box 30 is inserted into the case 1 together with the base 2 and the printed circuit boards 4, 5, 6, and 7, and also serves as the front cover of the case 1.

Reference numeral 35 denotes an input gear for switching operation modes, which is rotatably housed in the gear box 30. 36
is a switch gear that meshes with this input gear 35,
The rear of this switch gear 36 is a gear box 30.
It penetrates through 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 are connected to the gear box 30.
It engages with a ratchet pawl 45 formed in the same direction, and is positioned every 90 degrees. Further, four characters A, B, C, and D (specification display portion) are printed on the front surface of the switch gear 36, so that the switch gear 36 also serves as a display gear.

46 is an input gear for time unit switching, 47 is a switch gear that meshes with this input gear 46, and this input gear 46 and switch gear 47 are the input gear 35 and switch gear 36 for switching the operation mode.
It has exactly the same shape. 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. Above switch gear 4
A display gear 51 that meshes with the display gear 7 is arranged on the side of the display gear 7, and four time units (specification display sections) are printed on the front surface of the display gear 51.

52 is an input gear for switching the time scale; 53 is a switch gear that meshes with this input gear 52; this switch gear 53 has a switch slider 54 that slides into contact with the contact pattern 21 in the same way as the switch gear 36 for operating mode switching; is installed. 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 meshing teeth 57 of the display gear 56 are connected to the reduction teeth 53a of the switch gear 53. The ratchet gear 58 of the display gear 56 engages with the ratchet pawl 59 formed on the gear box 30, and is positioned by a predetermined pitch. Further, a notch 60 is formed on the upper outer periphery of the display gear 56,
By abutting both sides of this notch with the protrusion 61 protruding from the gear box 30, the display gear 5
6 can be rotated by a certain angle (for example, 40°).

A lamp cover 62 is fitted into a hole formed in the upper left corner of the gear box 30, and corresponds to the operation display element 15 provided on the printed circuit board 7. 63 is fitted into the gear box 30, and the gear box 30
It is a transparent sheet that covers the front of the Reference numeral 64 denotes a scale plate attached to the outside of the transparent sheet 63, which has a hole 65 in the center from which the knob shaft 33 protrudes, and around this hole are a scale 66 and six time scale number display windows 67.
and one time unit display window 68 are formed. Also, holes 69 and 7 are provided around the scale plate 64 through which the tip surfaces of the input gears 35, 46, and 52 are exposed.
0,71 and the hole 7 through which the lamp cover 62 is exposed.
2 and an operation mode display window 73 are formed.
The time scale number 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 letters of the switch gear 36. ing. Note that grooves 35a and 4 are provided on the tip surface of each input gear.
6a, 52a are formed, and a jig such as a screwdriver can be engaged with these grooves to rotate the input gear.

Reference numeral 74 designates a knob with a transparent front surface, and a pointer 75 is attached to the inner surface of this knob.A mounting screw 77 is inserted into the central hole through a washer 76 to tighten the knob shaft 3.
3, the knob 74 is fixed to the knob shaft 33. At this time, the outer peripheral end surface of the knob 74 is tightened by the tightening force of the mounting screw 77, so that the scale plate 64
However, since the outer peripheral end face of the knob 74 corresponds exactly to the axis portions 36a, 47a, 53a of the switch gears 36, 47, 53, each switch gear is pushed backward via the scale plate 64. Ru. Therefore, the switch sliders 40, 48, 5 attached to the rear end surfaces of the switch gears 36, 47, 53
4 is the contact pattern 17, 19, of the printed circuit board 7;
21, and the contact stability of the contact point is good.

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

First, each input gear 35, 46, 52 is rotated using a jig such as a screwdriver, and the display windows 73, 68, 67 of the scale plate 64 are displayed with "A" and "A" as shown in FIG. 10h" and numbers from "0" to "0.5" are displayed. As a result, the switch sliders 40, 48, 54 attached to the respective switch gears 36, 47, 53 are connected to the contact patterns 17, 19, 2.
1 Slide the top to switch the specifications. Note that 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, the input gears 35, 4 are prevented from rotating by the jig.
6 and 52 will not rotate unless forced, so there is no need to worry about the specifications changing.

Next, by turning the knob 74 to a desired time scale, the slider housing member 10 also rotates together with the knob, and the slider 9 housed in the slider housing member 10 moves into the sliding resistor 8. the desired resistance value. This completes the time setting, and by turning on the power, the electronic timer operates according to the set specifications.

In the above embodiment, the switch gear was rotated by turning the input gear with a screwdriver, etc., but the switch gear was rotated without turning with a jig such as a screwdriver.
For example, the switch gear may be rotated by attaching a knob to the tip of the input gear and turning the knob by hand.

(f) Effects of the invention As is clear from the above explanation, according to the invention, the time unit and the time scale numbers can be visually seen through the front of the knob, and the time units and the time scale numbers can be changed. Since the input gear does not require multiple scale plates or keys, this gear can be freely placed in any position other than the knob on the front of the case, making it compact and inexpensive without making the front of the timer large. It can be a timer.

[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 with the scale plate removed. It is a front view of a state. 1... Case, 2... Base, 7... Printed circuit board, 17, 19, 21... Contact pattern, 30
... Gear box, 33 ... Knob shaft, 35, 4
6, 52... Input gear, 36, 47, 53... Switch gear, 40, 48, 54... Contact member (switch slider), 51, 56... Display gear, 64
...Scale plate, 67, 68, 73...Display window, 74
...Knob.

Claims (1)

[Scope of utility model registration request] A case 1 forming a timer body, a knob 74 arranged near the center of the front surface of the case 1 and having a transparent front surface, a knob shaft 33 fixed to the center of the knob 74, and a knob 74 located inside the case 1. A printed circuit board 7 equipped with a circuit for outputting a signal according to the rotational position of the knob shaft 33, and a plurality of display windows 68 for displaying time units and time scale numbers through the front surface of the knob 74. , 67; input gears 46, 52 located in front of the printed circuit board 7 and operated from outside the case 1 to change the display on the display windows 68, 67; and a contact member. 48, 54, switch gears 47, 53 which are located within the case 1 and are driven by the input gears 46, 52 at a position rearward of the scale plate 64 and in front of the printed circuit board 7, and the printed circuit board members 19, 21 for generating a signal corresponding to the time unit and time scale selected by the input gears 46, 52 provided at 7, depending on the relationship with the contact members 48, 54; Switch gear 47,5
gear 5 which is driven by 3 and changes the above display;
A specification switching device for an electronic timer having 1.56.