JPS6122521A - Stopper mechanism for digital switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Technical Field of the Invention> The present invention relates to a digital switch that is attached to an electronic device, a sequencer, a measuring device, etc. to set a count of time or temperature. This invention relates to a stopper mechanism.

<Background of the Invention> As shown in FIG. 5, a conventional digital switch of this type has a case 6, a pair of push-type operating shafts 7, 7a, and letters 80 on the outer circumferential surface, and a number of letters in the center. A character wheel 8 formed with a ratchet gear 81 having a corresponding number of teeth is incorporated, and a contact unit unit is connected to the conductive pattern 82 of the character wheel 8.
By pushing the operation shaft 7 or 7'a, the character wheel 8 is stepped in the forward to reverse direction, and the fixed contact of the contactor unit 9 is controlled to turn on and off, thereby outputting a digital signal. It outputs and sets the time or temperature count. In such a digital switch, as a mechanism for stopping the character wheel at a set position, small holes 83 are bored in the boss part of the ratchet gear 81 in the character wheel 8 according to the number of characters, and the small holes 83 are made to correspond to the number of characters based on the setting range of the switch. Small hole 83.
A pin 84.84 is press-fitted into the case 6, and a stopper 61 is provided protruding from the base end of a pivot 60 that pivotally supports the character wheel 8, and the stopper 61 prevents the pin 84.84 from moving. It constitutes a stopper mechanism.

However, recently, as digital switches have become smaller, the character wheel 8 has also become smaller, and therefore, the ratchet gear 81 does not have a sufficient area for installing the pin 84. Moreover, the width l of the stopper 61 has to be smaller than the interval between the small holes arranged in a row on the character wheel, and as the size of the stopper becomes smaller, the width of the stopper becomes smaller and sufficient strength cannot be obtained. This makes it difficult to miniaturize digital switches.

In addition, in FIG. 6, when the stopper mechanism is activated by pressing the operation shafts 7, 7a, the pressing force is applied to the stopper pin 84.
and the abutting part of the stopper 61, and the abutting part of the feed pawl 70 and the ratchet gear 81. In particular, in this case, the feed pawl 70 naturally becomes thinner due to the miniaturization of the switch, and its strength becomes lower than that of the stopper. Therefore, sufficient stopper strength cannot be obtained and there is a risk of damage.

<Object of the Invention> The present invention provides a stopper mechanism between a character wheel and an operating member that advances the character wheel and stops it in a fixed position, thereby significantly reducing the size of a digital switch and achieving smooth operation. The purpose is to improve

<Configuration and Effects of the Invention> In order to achieve the above object, in the present invention, a stopper piece is positioned and fixed between the cylindrical portion of the character wheel and the ratchet gear, and the stopper piece is attached to the positioning brake piece of the character wheel in the operating member. A stopper device that engages with the piece and regulates the movement of the feed claw.

The structure was constructed. According to the above configuration, the space between the small character wheel, the bag ratchet gear, and the cylindrical portion has a sufficient size.
A strong stopper piece is press-fitted, and the brake piece of the operating member does not require a flexible shape due to its function, and a large pressing force can be set, thereby making it possible to significantly reduce the size of the digital switch. Further, the stopper piece has the effect of achieving the purpose of the invention by simplifying the structure, such as functioning to reinforce the small character wheel.

<Description of Embodiments> FIG. 1 shows the internal mechanism of a digital switch to which the stopper mechanism of the present invention is applied.

The above-mentioned digital switch includes a case 1 made of synthetic resin with an opening on the side, and an operating member 2 incorporated into the case 1.
It consists of a character wheel 3 and a contact unit 4 having a large number of fixed contacts 40 fitted into the opening surface of the case 1.

The case 1 is a synthetic resin molded case in which front and rear walls 11 and 12 and upper and lower walls 13 and 14 are integrally formed on each side of a side wall 10 forming a bottom plate. A see-through window 15 is provided, and holes 16, 16 are formed at vertically symmetrical positions thereof, a protrusion 17 is integrally formed on the rear wall 12, and a pivot 18 is integrally formed on the side wall 10.

The operating member 2 is made of a synthetic resin material having elasticity, and has an upper and lower operating shaft 2 that is parallel to the above-mentioned holes 16 and 16 apart.
A series of loop-shaped spring sections 21.21 at the rear of a, 2b
, is a molded body in which both spring parts 21 and 21 are connected by a mounting plate 22, and each operating shaft 2a, 2b has a push shaft part 23a, 23'b at the front end, and a push shaft part 23a, 23'b on the inside facing each other. A feed pawl 24a that advances the character wheel 3 in the forward and reverse directions.

24b and a brake piece 25a having a stopper piece 26 formed at its tip to stop the character wheel 3 in the forward movement position.

25b are formed symmetrically, and the operating member 2 is inserted into the case by inserting both push shaft portions 23a and 23b into the extraction holes 16 and 16 from the inside, and fitting into the case into the recess 427 of the mounting plate 22.
is engaged with the protrusion 17 of the corresponding case 1 and is housed in the case.

The character wheel 3 is a synthetic resin molded body having a pivot boss portion 31 in the center of a circular board 30 and a cylindrical portion 32 on the outer periphery, and a conductive pattern that contacts the contactor unit 4 on the outer surface of the board 30. 33, and letters 34 such as numbers corresponding to the conductive pattern are arranged on the outer surface of the cylindrical portion 32,
The central boss portion 31 is provided with a ratchet gear 35 having a number of teeth corresponding to the number of characters, and when the boss portion 31 is pivotally supported on the pivot 18 of the case 1, one character 34 on the outer periphery is attached to the transparent window 1.
5, and the feed claws 24a, 24 of each operating shaft 22.2b
b is engaged with the front symmetrical position of the ratchet gear 35, and the stopper piece 26 at the tip of the brake piece is engaged with the rear symmetrical position of the ratchet gear 35.

A stopper mechanism 5 according to the present invention is provided in a space 36 that goes around the ratchet gear 35 and the cylindrical portion 32. The stopper mechanism 5 includes a stopper piece 50.501 that is engaged and fixed between the gear groove 37 in the ratchet gear 35 and the corresponding positioning recess 38 on the inner surface of the cylindrical portion 32;
It consists of stopper pieces 26 and 26 protruding from the tips of the brake pieces 25a and 25b of the operating member 2. The stopper piece 50 is a synthetic resin molded body having a substantially sector-shaped side surface that engages with one tension between the recess 38 and the gear groove 37, and whose width is smaller than the length of the cylindrical part 32.
0 has a slit hole 5 that penetrates in the direction of the rotation axis of the character wheel 3.
1 to provide elasticity and press-fit and hold onto the character wheel 3, and a protrusion 52 protruding toward the opening side of the cylindrical portion 32 is provided at the outer end of the stopper piece 50, and the protrusion 52
The position and height of the stopper piece 50.50a is the brake piece 25a.

25b, and when the operating shafts 2a, 2b are pushed, the stopper piece 26.26 and the stopper piece 50 are joined together before the feed pawls 25a, 25b move to feed the ratchet gear 35, preventing the pawl feeding movement. I've set it up as much as possible.

Therefore, the operating shaft 2a or 2b has a push shaft portion 23a,
By operating 23b with your fingertips, it slides forward and backward due to the compression and restoring force of the spring portion 21, and at the time of such sliding, the character wheel 3 is filled with one character by the pawl feeding operation of the feed pawls 24a, 24b and the ratchet gear 35. Or rotate it in the opposite direction. When the stopper piece 50 or 50a press-fitted into the character wheel 3 reaches the rear of the brake pieces 25a, 25b and presses the push shaft portions 23a, 23b, the operation shafts 2a, 2
b is the stopper piece 2 relative to the protrusion 52 of the stopper piece.
Retraction is prevented by the connection of 6, and therefore the feed claw 24a
, 24b stops and functions as a stopper. Of course, both stopper pieces 50 and 501 also exhibit a reinforcing function for the small character wheel 3.

[Brief explanation of drawings]

1 and 2 are internal configuration diagrams of a digital switch to which a stopper mechanism according to the present invention is applied, FIG. 3 is an exploded perspective view of the digital switch, and FIG. 4 is a perspective view of a character wheel partially shown in cross section. 5 is an exploded perspective view of a conventional digital switch, FIG. 6 is a longitudinal sectional view, and FIG. 7 is a perspective view of the character wheel thereof. 1...Case 18...Axis 2
......Operating members 2a, 2b...
・Operation shaft 26...Stopper piece 3...
...Character wheel 31...Boss part 32...
...Cylinder part 34...Character 35...
... Ratchet 36 ... Space section 4 ...
...Contact unit 5...Stopper mechanism
52... Protrusion 50.50a... Stoppa Peace Proceedings Official Document Seal Seal) January 21, 1985 1. Indication of the case Patent Application No. 59-141044 2. Invention Name Digital Switch (S)7P Mechanism 3, Relationship with the Amendment Case Patent Applicant Address 1o Hanazono Tsuchido-cho, Ukyo-ku, Kyoto-shi, 616 Name
(294) Takashi Tateishi, Representative of Tateishi Electric Co., Ltd.
Male 4, Agent Address: 1-21-22 Shimanouchi, Minami-ku, Osaka 542 (2) Amended "Figure 5" on page 2, line 17 of the specification to "Figure 5 and Figure 6 1. (3) Same as above. Page 3, 2nd line, "conductive pattern 82" was corrected to "contact unit 82". (4) On the 2nd and 5th lines of the same page, "Contact unit" is corrected to "Conductive pattern 9J." (5) On the 5th line of the same page, "Fixed contact" is corrected to "Fixed contact J." (6) On the same page Page 9th line, ``The character wheel 8,'' is changed to ``As shown in Figure 7, the character wheel 8 is corrected to j (7) Page 5, line 12, ``... cannot be made smaller.'' “・
...Can be made smaller. ” was corrected. −1 above

Claims (3)

[Claims] (1) A letter wheel with letters such as numbers arranged on the outer circumferential surface and a ratchet gear with a number of teeth corresponding to the number of letters in the central boss part is rotatably mounted inside the case, and a push-type operating shaft is installed. In a switch that turns the character wheel in the forward and reverse directions to turn on and off the fixed contact of the contactor unit and outputs a digital signal, it is positioned between the inner surface of the cylindrical part of the character wheel and the ratchet gear. A stopper piece that is fixed and has a protrusion on a part thereof; and a stopper piece that protrudes from a braking piece for positioning a character wheel provided on the push-type operating shaft and supports the protrusion to prevent gear feeding of the operating shaft. A digital switch stopper mechanism consisting of. (2) The stopper piece is a synthetic resin molded body, and has a substantially fan-like shape that is stretched and fixed between the cylindrical part of the character wheel and the ratchet gear, and the protruding part corresponds to the brake piece of the operating shaft before gear feeding. The stopper mechanism for a digital switch according to claim 1, wherein the stopper mechanism for a digital switch is set at a position and height such that it comes into contact with the protrusion. (3) A stopper mechanism for a digital switch according to claim 1, wherein a recess for positioning the stopper piece is formed on the inner surface of the cylindrical portion of the character wheel in correspondence with the outer peripheral character.