JPS638993Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a dial advancing device for a digital counter or the like.

Conventionally, when a dial is advanced using a push button method, in order to enable forward and reverse operation, two push buttons are provided and a separate dial rotation mechanism is connected to each push button. It has the disadvantage that it is complicated and prone to erroneous operation and failure.

In order to eliminate such drawbacks, the present invention provides a dial stepping mechanism that is configured to move the dial smoothly and reliably by vertically moving the left and right operation thin plates that are integrally connected. It provides an operating device.

The embodiments of the present invention will be explained with reference to the drawings: 1
is a rectangular synthetic resin case with the front completely open, and includes upper and lower wall plates 1b, 1c and side wall plates 1d, which are erected facing forward on the outer peripheral edge of the back plate 1a.
It is formed by integrally providing a peripheral wall consisting of 1d. Reference numeral 2 denotes a small diameter disk integrally provided at the center of the inner surface of the back plate 1a, from which a central shaft 3 is protruded.

4 is a dial with numbers 5 from 0 to 9 attached at regular intervals on the outer circumferential surface, and is located on the back plate 1a of case 1.
A gear 6 having 10 teeth 5 is integrally formed in the center of one side of the opposite side, and the tips of these teeth 5 are formed into a mountain shape, and both end surfaces thereof are formed into an inclined surface 5.
a and 5b, and sliders 7 and 7 are fixed to the other side. The center hole 8 of the dial 4 is rotatably inserted into the center shaft 3 of the case 1 described above.

Reference numerals 9a and 9b are a pair of left and right inverted L-shaped operating thin plates made of thin synthetic resin plates, which are arranged to be vertically slidable on the inner surface of the back plate 1a of the case 1, and are interposed between the back plate 1a and the dial 4. Flexible bending parts 10a and 10b, which are formed by thin strips bent in an L-shape toward each other in the direction approaching each other, are integrally connected to the outside of these lower ends. The opposite ends of the horizontal portions are integrally connected to the center of the upper end surface of the lower center holding plate 11 which is made of a thin piece and has a dish-like shape.

Reference numeral 12 denotes a chevron-shaped protrusion that protrudes from the continuous portion between the flexible bending portions 10a and 10b and the lower central holding plate 11;
Adjacent teeth 5, 5 of the dial 4 on both sides of its upper end
Left and right inclined surfaces 1 that engage and disengage from opposing inclined surfaces 5a and 5b of
2a and 12b.

13a and 13b are the aforementioned left and right operation thin plates 9a,
The left and right cam pieces are opposed to each other and protrude forward from the upper inner edges of the gears 9b, and the inclined surfaces 14 engage and disengage the lower end surfaces of the inclined surfaces 5a and 5b of the adjacent gears 5 and 5.
a, 14b.

15 is an inverted L where the left and right operating thin plates 9a and 9b face each other.
It is a U-shaped thin guide plate disposed in the character-shaped space, and its lower end center is integrally connected to the connecting part between the flexible bending parts 10a, 10b and the lower central holding plate 11, and the left and right upper end surfaces 15a , 15b as the left/right operation thin plate 9
The upper and lower surfaces 9a' and 9b' of the upper and lower surfaces 9a and 9b are opposed to each other with a small distance therebetween, and the semicircular lower end surface 15a of the central recess is capable of being engaged with the small-diameter disk 2 described above.

Push buttons 16a and 16b are integrally provided upwardly on the outer side of the upper end of the left and right operating thin plates 9a and 9b, and are pushed upwardly through through holes 17 and 17 formed on both sides of the upper wall plate 1b of the case 1. It's made to stick out.

Reference numeral 18 denotes a spring press-fitted between a central recess on the lower surface of the bottom wall plate 19 protruding forward from the lower edge of the lower central holding plate 11 and a central recess on the upper surface of the lower wall plate 1c of the case 1; Together with 9a and 9b, the center holding plate 11 is pressed upward.

Reference numerals 19 and 19 denote vertically elongated holes drilled on both sides of the lower center of the left and right operating thin plates 9a and 9b, 20 denotes a vertically elongated hole drilled in the center of the lower central holding plate 11, and a guide pin bored in the back plate 1a of the case 1. 21, 21, and 22, respectively.

Therefore, in the normal state, the guide pins 21 and 22 are held in contact with the lower ends of these vertical holes 19 and 20 by the upward force of the spring 18, and the semicircular shape of the U-shaped thin guide plate 15 described above is maintained. End face 15
A is brought into contact with the lower peripheral surface of the small disc 2, and
In this state, as shown in FIG.
While being locked to the opposing inclined surfaces 5a and 5b,
The cam pieces 13a, 13b are adjacent to the upper gears 5, 5.
are located above the inclined surfaces 5a and 5b, respectively.

Reference numeral 23 denotes a transparent plate 2 through which the numbers on the dial 4 can be seen through a through hole bored in the center of the upper wall plate 1b of the case 1.
4 is installed.

25 is a printed circuit board attached to the front opening end of the case 1, and its printed surface is connected to the dial 4 mentioned above.
It is brought into sliding contact with the slider 7 of.

Reference numerals 26, 26 are connecting pedestals that protrude from both sides of the end face of the lower wall plate 1c, and extend forward through the lower portions of both sides of the printed circuit board 25. Reference numerals 27, 27 are fitting holes bored on both sides of the lower end of the back plate 1a on the back side of the protrusions 26, 26, into which the protrusions of the next case are fitted, and multiple dial advancing devices are connected in parallel. It is designed to be connected to.

To describe the operation of the embodiment configured as described above, under normal conditions, as shown in FIG. 4, the left and right operating thin plates 9a and 9 are
The cam pieces 13a, 13b of b are located above the teeth 5, 5 on the upper part of the gear 6, and the chevron-shaped protrusion 12 is locked between the teeth 5, 5 on the lower part of the gear 6.

From this state, for example, when the right push button 16b is pressed, the right operating thin plate 9b moves downward against the spring 18, and the lower central holding plate 11 and the left operating thin plate 9a are integrated with the flexible bending parts 10a and 10b. will also move downward.

At this time, due to the downward force applied to the push button 16b of the right operating thin plate 9b and the upward force of the spring 18 disposed at the center of the lower end, the flexible bent portion 10 of the right operating thin plate 9b is
b is deformed more than the flexible bent portion 10a of the left operating thin plate 9a, and the right operating thin plate 9b becomes the left operating thin plate 9a.
A larger amount of downward movement is given. At this time, in order to prevent excessive deformation, the lower surface 9b' of the right operating thin plate 9b is brought into contact with the upper right end surface 15b of the U-shaped guide thin plate 15.

When the right operating thin plate 9b moves down significantly in this way, the lower end inclined surface 14b of the cam piece 13b presses against the left inclined surface of the upper tooth 5 of the gear 6, as shown in FIG. Rotate slightly more than half a pitch in the direction. At this time, the lower central holding plate 11 moves downward and the chevron-shaped protrusion 12 is pushed downward from between the adjacent teeth 5 and 5 at the bottom, so that the right inclined surface 12b of the chevron-shaped projection 12 has one inclined surface. The tooth 5 that was locked at 5a is now the chevron-shaped protrusion 12
The other inclined surface 5b is rotated to a position opposite to the left inclined surface 12a of the chevron-shaped projection 12.

When the push button 16b is released from this state, the restoring force of the spring 18 causes the left and right operation thin plates 9a,
9b and the lower center holding plate 11 move upward integrally,
At this time, the chevron-shaped protrusion 12 also rises and presses the other inclined surface 5b of the tooth 5 with its left inclined surface 12a, causing the tooth 5 to further move clockwise, and the tooth 5 and the tooth 5 on the right Rotation of the gear 6 is stopped in a state in which both side inclined surfaces 12a and 12b are engaged with the opposing inclined surfaces 5a and 5b.

Therefore, when the gear 6 rotates one pitch by one operation of the push button 16b, the dial 4 including the gear 6 changes in the forward rotation direction by one scale.

Further, when the dial 4 is reversed to decrease one division, the left push button 16a can be operated in the same manner as described above.

As described above, in the present invention, the cam pieces 13a, 13b
The left and right operation thin plates 9a and 9b having the same structure are integrally connected to the lower center holding plate 11 via the flexible bent portions 10a and 10b, so that the structure is extremely simple since they are formed entirely from one plate. Moreover, by pressing the push buttons 16a, 16b of the left and right operation thin plates 9a, 9b, the chevron-shaped protrusions 12 protruding from the connecting parts of the flexible bending parts 10a, 10b perform a common operation, and the dial 4 is operated in a common manner. Since the teeth 5 and 5 of the gear 6 engage and disengage, the same effect can be achieved in both forward and reverse operations, eliminating malfunctions.Furthermore, the left and right push buttons 16a and 16b are connected to the left and right operation thin plates 9, respectively.
The flexible bent portions 10a and 10b of the left and right operating thin plates 9a and 9b, which are protruding from the outer edges of the upper ends of the left and right operating thin plates 9a and 9b, are connected to the upper end of the lower central holding plate 11, which is pressed by a spring 18. Since there is, press button 16
The downward force acting on a and 16b and the spring 1
The pushing up force caused by the flexible bending portions 10a, 1
The bent portion 10 acts parallel to the inner and outer ends of 0b.
a, 10b can be bent while smoothly deforming, and therefore the cam piece of the operating thin plate on the side to be pressed can be moved down in advance of the cam piece of the other thin operating plate. The dial 4 can be reliably rotated in the desired direction by quickly pressing only the cam piece against the upper teeth 5 of the gear 6.
By releasing the pressing force of the push button, the chevron-shaped protrusion 12
This allows accurate stepping by further rotating the lower teeth 5 of the gear 6 in the same direction.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention: Fig. 1 is a partially cutaway front view, Fig. 2 is a plan view, Fig. 3 is a longitudinal side view, and Fig. 4 is a state with the printed circuit board and dial removed. FIG. 5 is an explanatory view of the operation of the cam piece and the chevron-shaped protrusion relative to the gear. 1 is a case, 3 is a center axis, 4 is a dial, 5 is a tooth, 6 is a gear, 9a, 9b are left and right operation thin plates, 10
a, 10b are flexible bending parts, 11 is a central holding plate,
12 is a chevron-shaped protrusion, 13a and 13b are cam pieces, 1
6a and 16b are push buttons, and 18 is a spring.

Claims (1)

[Scope of utility model registration request] A dial 4 is rotatably pivoted to a central shaft 3 protruding from the center of the inner surface of the back plate 1a of the case 1.
A gear 6 having a plurality of teeth 5 having a plurality of teeth 5 formed on sloped surfaces 5a and 5b with mountain-shaped tips is integrally fixed to the center of one side of the dial 4 facing the back plate 1a,
Inverted L-shaped left and right operating thin plates 9a and 9b are interposed between the dial 4 and the back plate 1a of the case 1 so as to be vertically movable, and the lower ends of these left and right operating thin plates 9a and 9b are connected to flexible bent portions 10a, It is integrally connected to the lower center holding plate 11 via the lower center holding plate 10b, and a chevron-shaped protrusion 12 is provided at the center of the connected portion to engage and disengage between the adjacent teeth 5, 5 at the lower part of the gear of the dial 4. A cam piece 13a that engages and disengages from the opposing inclined surfaces 5a, 5b of the adjacent teeth 5, 5 on the upper part of the gear of the dial 4 is attached to the upper opposing inner edge of the left and right operation thin plates 9a, 9b.
13b, respectively, and left and right operation thin plates 9a,
Push buttons 16a and 16b are respectively provided on the outer edge of the upper end of the case 1 so as to project upward from both sides of the upper wall plate 1b of the case 1, and the push buttons 16a and 16b are connected to the lower wall plate 1c of the case 1 and the center holding part. A dial advancing device in which a spring 18 is press-fitted between the lower surfaces of a plate 11.