JPH0330985Y2 - - Google Patents

Description

[Detailed description of the invention] <<Industrial application>> This invention is a specification switching device for electronic timers, such as time scales, time units such as hours, minutes, and seconds, and operations such as time-limited operation and instantaneous action and time-limited return. This relates to a device that switches modes and specifications.

<<Prior Art>> Conventionally, electronic timers have been provided in which a single unit has a plurality of functions by switching an internal circuit having a plurality of time specifications from the outside. This switching method is to use a switch to change the internal circuit to change the time specification, and then replace the scale plate according to the time specification, or by inserting a key displaying the time specification into the timer body. A 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.
This had the disadvantage that it was expensive and the front part of the timer was thick.

In order to improve this drawback, the present applicant previously proposed in Utility Application No. 58-46001 a timer with a gear box provided on the front part of the timer body and a contact pattern for switching specifications. A printed circuit board attached to the rear side, a display gear that is rotatably stored in a gear box and has a specification display section on the front, a switch gear that is integrated with or interlocks with the display gear, and a switch gear that is a switch slider that is attached and slides on the contact pattern of the printed circuit board; a nameplate that is attached to close the front side of the gear box and has a display window that exposes a specification display section of the display gear; proposed an electronic timer specification switching device equipped with

[Problem that the invention aims to solve] However, in this electronic timer specification switching device, the switch gear is rotated in an analog manner when changing the time unit, so there is a possibility that settings may be slightly deviated or incorrectly set. There was a problem.

The present invention solves these problems, and allows accurate confirmation of specification changes on an hourly basis.
It is an object of the present invention to provide a specification switching device for an electronic timer that is free from the possibility of being set slightly deviated or erroneously set.

<Means for Solving the Problems> In order to achieve the above object, the present invention has a gearbox provided on the front side of the timer body and a contact pattern for switching specifications, and a gearbox provided on the rear side of the gearbox. A first display gear rotatably housed in a gear box and provided with a time unit display on the front; and a first display gear rotatably housed in the gear box and provided with a time scale display on the front. A third display gear rotatably housed in a gear box and having an operation mode specification display on the front surface is interlocked with each of the first, second, and third display gears. A switch gear, a switch slider that slides on the contact pattern of the printed circuit board attached to each switch gear, and first, second, and third displays attached to close the front side of the gear box. a nameplate provided with a display window through which each display of the gear is exposed; a reference line a is provided near each reference position of the zero display of the time scale display of the second display gear; The present invention is characterized in that a recess with which the reference line a coincides is provided in a part of the reference display window of the time scale display window where the time scale display of the gear is exposed.

<Operation> With this configuration, the time unit display, time scale display, and operation mode specification display of the first, second, and third display gears are displayed in each display window of the nameplate, and the display window provided in the reference display window of the nameplate is displayed. Align the reference line a of the second display gear with the recess to confirm that the time unit has been switched accurately. As a result, even if each switch gear rotates in an analog manner, the settings will not deviate, and the switch slider attached to each switch gear will accurately slide on the contact pattern, and the display window and can be switched accurately without being set to different specifications.

<<Example>> Hereinafter, the present invention will be described based on an illustrated example.

In FIGS. 1 and 2, 1 is a cylindrical case constituting the timer body, 2 is a base in which a number of octal pins are implanted, and the protrusion 2a of the base 2 is engaged with the engagement hole 1a of the case 1. As a result, the base 2 is fixed within the case 1.
Reference numeral 4 indicates a printed circuit board that is closely fixed to the inner surface of the base 2, and 5 and 6 indicate printed circuit boards that are fixed at right angles to the base 2. These printed circuit boards 4, 5, and 6 are electrically coupled to each other. Further, engagement holes 5a, 6a (6a
are not shown), and by fitting protrusions 7a and 7b (7b not shown) formed on the upper and lower parts of another printed circuit board 7 into these engagement holes and soldering them, the printed circuit board 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 the slider storage member 1 is arranged so that the slider 9 is always in sliding contact with the sliding resistor 8.
0 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,
29 and around each support hole 16, 18, 20, contact patterns 17, 19, 21 for switching each specification are provided. That is, the illustrated contact pattern (contact pattern for operating mode) 17 at the upper right is for switching operation modes such as time-limited operation, instantaneous operation, time-limited return, and repeated operation, and the contact pattern at the lower right (contact pattern for time unit) 19 is for switching time units such as hours, minutes, seconds, etc., and the lower left contact pattern (time scale 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 30 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. A knob shaft 33 is rotatably fitted into the center hole 32 of the gear box 30, and by engaging the protrusion 34 protruding from the rear surface of the knob shaft 33 with the slider storage member 10, the knob can be rotated. Shaft 33 and slider storage member 1
0 and rotate together.

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 (operation mode switching switch gear) that meshes with this input gear 35, and the rear part of this 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. There is. A wave-shaped disc-shaped switch slider (switch slider for operation mode) 40 is engaged and held on the rear end surface of the switch gear 36, and is pressed onto the contact pattern 17 of the switch slider 40. There is. Four ratchet teeth 44 are formed on the rear outer surface of the switch gear 36, and these ratchet teeth 44 engage with ratchet pawls 45 formed on the gear box 30 to be positioned every 90 degrees.
Furthermore, on the front side of the switch gear 36, A, B,
Four characters C and D (operation mode specification display) are printed, and the switch gear 36 also serves as a display gear (third display gear).

46 is an input gear for time unit switching; 47 is a switch gear (switch gear for time unit switching) that meshes with this input gear 46; a switch gear (switch gear for time unit switching) that meshes with this input gear 46; The input gear 46 and the switch gear 47 have exactly the same shape as the input gear 35 and the switch gear 36 for switching operation modes.
That is, a switch slider (time scale switch slider) 48 that slides on the contact pattern (time scale contact pattern) 19 is attached to the switch gear 47 and engages with the ratchet pawl 49 of the gear box 30. Ratchet teeth 50 are formed. A first display gear 51 that meshes with the switch gear 47 is arranged on the side of the switch gear 47, and four time units (time unit specification display) are printed on the front surface of the first display gear 51. There is. 52 is an input gear for switching the time scale, 53 is this input gear 52
This switch gear meshes with the switch gear 5.
3 is attached with a switch slider (switch slider for time scale) 54 that slides into contact with the contact pattern 21 in the same manner as the operating mode switching switch gear 36. 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. In the center of the gear box 30, as shown in FIG. A display gear (time scale gear) 56 is rotatably housed. In other words, the time scale is (0.1, 0.2,
1, 2), (0.2, 0.4, 2, 4), (0.3,
0.63, 6), (0.4, 0.8, 4, 8), (0.5,
1.5 and 10), and are displayed clockwise in this order, with four zeros "0" corresponding to the singular number of each time scale printed on the end side of the time scale. A reference line a is provided near each reference position of the "0" character. Second display gear 5
The meshing teeth 57 of the meshing teeth 56 of No. 6 mesh with the reduction gear teeth 53a of the switch gear 53, and the meshing teeth 57 of the meshing teeth 56 of No.
The six ratchet teeth 58 engage with ratchet pawls 59 formed on the gear box 30 and are positioned at predetermined pitches. Further, the second display gear 56
A notch 60 is formed on the upper outer periphery of the gear box 30, and both side surfaces of the notch 60 abut against a protrusion 61 protruding from the gear box 30, so that the second display gear 56 is tilted at a certain angle (for example, 40 degrees). It is designed so that it can be rotated.

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 64 is a name plate attached to the outside of the transparent sheet 63, and as shown in FIG. 6, there is a hole 65 in the center from which the knob shaft 33 projects.
Around this hole 65, there is a scale 66, six time scale display windows 67, and one time unit display window 68.
is formed, and approximately in the center of the reference display window with "0" as the base point of the time scale display window 67,
A recessed portion 67a is provided, and when the recessed portion 67a coincides with a reference line a provided on the front surface of the second display gear 56, it is possible to confirm by display that the time unit has been accurately switched. It is. In addition, the input gears 35 and 4 are provided around the nameplate 64.
Holes 69, 70, 71 where the tip surfaces of 6, 52 are exposed
A hole 72 through which the lamp cover 62 is exposed and an operation mode display window 73 are formed. As described above, the time scale display window 67 corresponds to the time scale of the second display gear 56, the time unit display window 68 corresponds to the time unit of the first display gear 51, and the operation mode display window 73 corresponds to the time scale of the second display gear 56. It corresponds to the letter 36 on the gear. In addition, each input gear 35, 46, 5
Grooves 35a, 46a, 52a are formed on the tip surfaces of the input gears 35, 4.
6, 52 can be turned.

Reference numeral 74 denotes a knob. A pointer 75 is attached to the inner surface of the knob 74. The knob 74 is attached to the knob shaft 33 by inserting a mounting screw 77 into the center hole through a washer 76 and screwing it into the knob shaft 33. Fixed. 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 at the axis 36a, 4 of the switch gears 36, 47, 53.
7a, 53b, each switch gear 3
6, 47, and 53 are pressed rearward via the name plate 64. Therefore, the switch sliders 40, 48, 5 are 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 each display window 7 of 64 is rotated.
3, 68, and 67 are displayed with "A", "10h", and numbers from "0" to "0.5", as shown in FIG. 4, for example. At the same time, the reference line a of the second display gear 56 is aligned with the recess 67a provided in the reference display window 67 at the "0" point on the nameplate 64 to confirm that the time unit has been changed accurately. As a result, even if each switch gear 36, 47, 53 rotates in an analog manner, the settings will not deviate, and the switch sliders 40, 48 attached to each switch gear 36, 47, 53, 54 is contact pattern 17,1
9 and 21, and can be switched accurately without being set to a specification different from that shown. Note that each switch gear 36, 47, 53 has ratchet teeth 44, 50, 58 and a ratchet pawl 4.
Since the input gears 35, 49, and 59 are prevented from rotating by engagement with the input gears 35, 49, and 59, they will not freely rotate unless the input gears 35, 46, and 52 are forcibly rotated using a jig, and there is no need to worry about the specifications changing. do not have. Next, by turning the knob 74 to a desired time scale, the slider housing member 10 also rotates together with the knob 74, and the slider 9 housed in the slider housing member 10 becomes a 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 switching method is such that the switch gear is rotated by first turning the input gear with a screwdriver, etc. However, it is also possible to eliminate the input gear and turn the switch gear or display gear directly with a screwdriver, etc. good. Furthermore, instead of rotating these gears with a jig such as a screwdriver, the switch gear may be rotated by, for example, attaching a knob to the tip of the input gear and turning this knob by hand.

<<Effect of the invention>> As explained above, the present invention consists of a gearbox provided on the front side of the timer body, and a printed circuit board that has a contact pattern for switching specifications and is attached to the rear side of the gearbox. a first display gear that is rotatably housed in the gear box and has a time unit display on the front; and a second display gear that is rotatably housed in the gear box and has a time scale display on the front. , a third display gear that is rotatably housed in a gear box and has an operation mode specification display on the front, a switch gear that interlocks with each of the first, second, and third display gears, and each switch. a switch slider attached to the gear and sliding on the contact pattern of the printed circuit board; a first switch slider attached to close the front side of the gear box;
a nameplate provided with a display window through which each display of the second and third display gears is exposed, and a reference line a is provided near each reference position of the zero display of the time scale display of the second display gear; Specification switching of an electronic timer characterized in that a recessed part with which the reference line a coincides is provided in a part of the reference display window of the time scale display window in which the time scale display of the second display gear is exposed on the nameplate. It is a device.

Therefore, the time unit display, time scale display, and operation mode specification display of the first, second, and third display gears are displayed in each display window of the nameplate, and the number plate is displayed in the recess provided in the reference display window of the nameplate. Check that the time unit has been changed accurately by aligning the reference line a of the display gear 2. As a result, even if each switch gear rotates in an analog manner, the settings will not deviate, and the switch slider attached to each switch gear will accurately slide on the contact pattern, and the display will not change. It is possible to switch accurately without being set to different specifications.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment of an electronic timer specification switching device according to the present invention, Fig. 2 is an exploded perspective view of this electronic timer, Fig. 3 is a sectional view of its main parts, and Fig. 4. is a front view with the nameplate removed,
FIG. 5 is a front view of the time scale gear, and FIG. 6 is a front view of the nameplate. 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... Switch slider, 56... Second display gear, 64... Name plate, 6
7a...Recess, a...Reference line.

Claims (1)

[Scope of utility model registration request] A gearbox is provided on the front of the timer body, a printed circuit board is installed on the rear side of the gearbox and has a contact pattern for switching specifications, and a timer is rotatably housed inside the gearbox and displays a timer on the front. a first display gear provided with a unit display;
a second display gear rotatably housed in the gear box and provided with a time scale display on the front; a third display gear rotatably housed in the gear box and provided with an operation mode specification display on the front; , a switch gear that interlocks with each of the first, second, and third display gears, a switch slider that is attached to each switch gear and slides on the contact pattern of the printed circuit board, and a front side of the gear box. and a nameplate provided with a display window that is attached so as to close the first, second, and third display gears and exposes each display of the first, second, and third display gears, and each reference position of the zero display of the time scale display of the second display gear. A reference line a is provided in the vicinity of the nameplate, and a recess with which the reference line a coincides is provided in a part of the reference display window of the time scale display window on the nameplate where the time scale display of the second display gear is exposed. An electronic timer specification switching device featuring: