DE1955439C3 - Push-button switching device for switching digit rolls - Google Patents

Description

The invention relates to a push-button switching device for switching digit roles, in which a key slide, supported by a return spring and arranged perpendicular to the axis of the numeric roller is connected to a resilient pawl which, when the key slide is actuated, enters the progressive wheel the number roller engages and is stressed on train.

Preset counters are known in which open slots or openings that can be closed by cover flaps are provided for setting preselection numbers. The adjustable dials are accessible through these openings in order to be able to set or change the preselection number. The disadvantage of these designs is that when the flaps are open or as a result of access through one of these openings, the sensitive works are very easily soiled and thus unusable. In addition, the number rolls are generally not easily accessible through the open slots or the closable openings, so that the setting of the preselection number is often quite laborious.

In order to circumvent these difficulties, key switch devices are used in which the setting of the preset number can be made by actuating a key or a keypad. The pawl engages in the ratchet wheels attached to the setting dials or directly in the ring gear of the setting dials. In both cases, a detent spring ensures that the number rollers or the indexing wheels can only be rotated further when they are subjected to a sufficiently large torque that is sufficient to overcome the action of the detent spring.

In one of these known designs, a key slide is guided at two points a pawl is hinged, which by a separate spring in the direction of the axis of the number rollers is applied. The pawl is arranged so that it is when the key slide is actuated presses with its free end against a tooth of the ratchet wheel and thus shifts it further. The spring acting on the pawl ensures that when moving back of the key slide, the pawl glides over the teeth of the ratchet wheel and is in the starting position the slide switch does not affect the ratchet wheel. The pivoting path of the pawl is included limited by special stops.

This version with particularly spring-loaded and limited switching pawls is expensive and little space-saving. In addition, the pivoting path of the pawl must be adjusted so that it is in the idle state cannot come into engagement with the ratchet wheel of the number roller. Since the ratchet on the Switching the digit roller or the ratchet wheel is subject to pressure, they and their storage must be designed to be relatively stable, so that no bending and thus under a heavy load Hntjustiercn occurs, which affects the safe operation of the key switch device would.

In another of the known designs, a self-resilient leaf spring is used as the pawl, which is rigidly connected to a pushbutton or a button slide and when the button or the button slide is operated, it comes into direct engagement with the ratchet wheel of the number roller. The leaf spring is arranged in such a way that it is subjected to pressure to advance the ratchet wheel. When the key or the key slide is moved backwards into the starting position, the leaf spring resiliently engages a tooth of the ratchet wheel. A significant disadvantage of this arrangement is particularly to be seen in that only low torques can be exerted on the ratchet wheel by the compressively stressed leaf spring. However, since such Schalträdcr or the number rollers are held in their preset preset positions in an advantageous manner by relatively strong locking springs, they can only be switched poorly by the leaf spring. There is a great risk that the leaf spring is bent , so that a

i 955 439 (Y

3 '4

Reliable shifting was no longer carried out can switch the dials to pressure

In another of the known designs, and thus must be sufficiently kink-resistant

(German Auslegeschrift 1 23 7 819) is sen on a button, it plays the switching device according to the invention

a pawl is articulated in such a way that it only absorbs the tensile load on the pawl when it is lowered

press the key to advance to the number scroll role. As a result, this does not need to be so sta-

trained under the pressure of the return spring for the button on bil as in many known devices

the lower part of the key is applied to be when going back the det and can still large torques

The key, however, evades the tooth of the ratchet wheel and is applied to the number rollers. There is no need

and the return spring at the same time the button in the io bending of the pawl and thus a misalignment

Brings back the starting position. Apart from the ren of the device to be feared that

The elaborate articulated connection between the switching pawl is rather caused by the tensile stress

handle and button, which naturally, especially chung practically adjusts itself again and again,

if high torques are to be exerted, Another advantageous embodiment is

wear, which should not be underestimated, provided that the

is, this version has additional pushbuttons for the swivel range of the

share. These lie in the fact that the reset pawl in the direction of the number roller axis

development of the button causing compression spring, which at the same time limiting stop for a at the free end of the

is in operative connection with the pawl, does not have guide / pins provided for the pawl,

can be guided along its entire length. In this way it is achieved in a simple manner that the

Because of this, it can easily be bent out. Sound latch at rest / ustan: l the rotation of the .'it-

spring end that is not guided. On the other hand, learning does not interfere and is actuated exactly on the

This spring should only be relatively weak, since it touches the right tooth without

otherwise it would act so strongly on the pawl that smart ones need to be provided. Much is enough-

Let these 25 more when you go back, turn the key slide with the pawl

Would operate ratchet wheel. Since thus the reset [ach to use in the device in question and

force for the key can only be very small, the key can then be placed on the key slide.

Tlicse easily jam so that they are not tidy. that the guide pin is at the stop of the key

is returned according to. This point is important.

especially critical because in this embodiment the key slide is advantageously on

tion the button only in a very short area in its front end by guiding one there

halfway through or directly on the front panel of the pushbutton provided in front of it and on its rear

direction can be guided. _rcn r: _n de by guiding a guide pin

Another known key switching device is lurking, the return spring being designed as a compression spring supported by the Fühldeutsches utility model 1825 679) used around 35 runy pegs, on its guide and on the pressure spring also supported by a pawl slider hinged on a key. and with the associated disadvantages of an articulated joint, the shifting of the key slide is in actuation connection. Here, the pawl reaches the direction of movement by a stop that interacts with the guidance of the Ta-key by pressing the button in the area of the toothed slider and pulls it further by 40 slider and in the return direction through one angle of rotation. A separate push-button protruding part of a switch hook beFeder is necessary through which the switch pawl adjoins the. With this design, the assembly area of the pinion is pivoted and the enabled key switch device is extraordinarily united so that when the key is moved back over the fold and an adjustment of the pawl it completely slides over the teeth of the pinion. _{45 made} redundant. F.inc more Montagcvercinfa-

The invention is based on the object, under investigation and cost savings with an out-avoidance the stated disadvantages already bcst embodiment of the invention according to claims 4 and 5 recognized Push-button switching devices for switching is sufficient.

A key switch device in particular from numeric rollers.

üondcrc for use in preset counters or 50 explained in more detail below with reference to the drawings. In

To create preselection switches that are extremely cheap to the drawings shows in partly schcmatischer

create and assemble / u is very easy, neither ju- representation

needs to be fctiert and despite the simpler and Fig. 1 a Te ^; ! view of a preselection pulse <vähl-

lightweight construction very high torques on the movement with a

/ Put remote rollers or animals on ratchet wheels 55 detulen push button switch control.

can. F i g. 2 the in F i g. I dargjteile'c pushbutton

According to the invention, this object is achieved by switching device during the actuation process

solves that the pawl from a rigid with the and

Key slide connected spring element viewed. F 1 g. 3 do in the fig. I and 2 shown pressure

Linc. Such training of the pawl and Ta- ^fi o taMerisdiallcinriditung during the on the Betiiti-

is extremely simple and cost-saving, with the following return movement.

since there are no articulations and additional Fc- In the front panel I of the in the Fi g. ί to 3 shown

which are required. Nonetheless, in the other end, the preselection counters can be a with a das

set for the well-known key switch device, with counter g ^ dust-protecting clear

the leaf spring *, for the switching of the number rolls 65 disc 2 provided viewing window 3 incorporated, left

are used, large torques are exerted by means of a number roller 4. This digit

which, without there being any kinking, is deeply caught on its front side surface

mentes can come. While most of them have a switching ratchet 5 that is firmly connected to it.

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its sawtooth-shaped toothing for lint splitting is used for the preselection number. On the rear side surface of the number roller 4 is, as indicated in Fig. 1, a locking mechanism that works from the inside out. a warning 6 provided, in which a with a not given Drive wheel connected spring element7 (engages. The locking toothing 6 and the spring Icment7 serve for the variably adjustable locking connection between the drive wheel and the Digit roller 4.

A guide opening 8 is provided in the front panel 1 above the viewing window 3, in FIG which a preferably made of plastic Ite pushbutton 9 is mounted. This pushbutton is open a pushbutton slide 10 is pushed on, which at the end facing the pushbutton 9 has an in a guide hole 14 of a support wall 12 provided on the housing cover 13 protruding into the guide pin 11 is stored. This guide pin 11, which is designed as part of the key slide 10, is surrounded by a return spring designed as a compression spring 15, which is located on the key slide 10 and the Supports support wall 12 and serves to move the key slide back after it has been actuated.

Below the guide pin 11 is on that of c he Key 9, the end of the key slide 10 pointing the way has a resilient pawl 16 molded onto it, at their end pointing in the direction of the push button 9 with a guide pin 17 and eimm Shift hook 18 is provided. The switching pawl 16 with its switching hook 18 and its guide pin 17 and the key slide 10 with its guide pin 11 consist of one part, which is preferably is made of plastic. The guide pin 17 attached to the pawl protrudes into: n in the push button 9 provided guide slot 19 which is closed at the bottom and thus forms a stop 20 for the guide pin 17, which prevents the switch hook 18 can intervene in the Scha trad 5 in the rest position of the key slide. In addition, di: n Guide slot 19, the pawl 16 out laterally so that they are always in the correct orientation; the ratchet 5 is.

To assemble the key switch device, the compression spring only needs to be placed on the guide pin 111 and the pin inserted into the bore 14. When the push button 9 is then placed on the push button slide 10, the assembly is practically finished, since the push button slide ί 10 is securely guided by the guide pin 11 and the push button 9 and its displacement in the direction of actuation by a cooperating with the support wall 112 is on him Attached stop 21 and in the return direction by a part of the switch hook 18 projecting above the pressure plate and thus the guide opening ". Due to the special design of the key switch, all jushling work is dispensed with.
To advance the number roll 4 opposite

ίο the one connected to it via the Fcderelement 7 Drive roller, the rotation of which is blocked at this time, is the Drucktasle9 in the direction des in Γ i g. 2 shown arrow 22! '«: The switch hook 18 comes into engagement with a Tooth of the ratchet wheel 5, so that this and thus the number roller 4 is moved on until the spring element 7 in the next recess ■: 1 latching toothing 6 engages. Then push button 9 released again, so that the key slide by the force of the return spring 15 in the direction of in Fig. 3 shown arrow 23 is moved back. Included the back of the shift hook Ϊ8 slides over the following tooth of the ratchet wheel 5, as the Ratchet due to their spring action

»5 can dodge above. Due to the special design the pawl is achieved in that it is claimed only on train when the push button 9 is pressed can be. As a result, it can be designed to be relatively weak because it kinks when it is actuated the switching device is not to be feared. Nevertheless, high torques can be applied to the Ratchet wheel and thus transferred to the number roller. Even a purely theoretically possible one Bending the pawl by springing it back during the return movement would not be harmful, since such bending when the pawl is subjected to tensile stress is practically compensated for again would.

It should be understood that the present invention

is not limited to the illustrated embodiment. So the push button switch device according to the invention not only for preset counters but also for all other increments of any number roles are used.

It is also possible, with the push button switch device according to the invention, not only one at a time but to advance several number roles at the same time. In this case, for example, the switch hook 18 can be replaced by a bridge with several shift hooks, each of which engages in a ratchet wheel.

1 sheet of drawings

Claims (5)

Patent claims: 1. Push-button switching device for switching digit roles, in which one of a Return spring supported pushbutton slide arranged perpendicular to the number axis a resilient pawl is connected, which engages with actuation of the key slide in the incremental wheel of the number roller and thereby on Train is claimed, characterized in that the pawl (16) consists of a there is a spring element rigidly connected to the key slide (10). 2. Push-button switching device according to claim 1, characterized in that the push-button (9) provided for actuating the key slide (10) has a pivoting range of the pawl (16) in the direction of the numeral axis limiting stop (20) for a free end <_er Has pawl (16) provided guide pin (17). 3. Drucktastenschaiteinrichtung according to claim 1 or 2, characterized in that the key slide (10) is mounted at its front end by guiding a push button provided there on it (9) and at its rear end by guiding a guide pin (11), wherein the return spring (15) is formed as a the guide pin (11) surrounding, supported at its Füllrung (12) and IEM slide (10) compression spring, and that the displacement of the key ^shifter., n Bet '' igungsrichtung (22) by a with the F ^; Ihrunf (12) of the key slide (10) interacting stop (21) on the key slide and in the return direction by a part of a switch hook (18) protruding beyond the push button (9). 4. Push button switching device according to one of the preceding claims, characterized in that that pawl (16) and key slide (10) consist of one part. 5. Push button switching device according to claim 4, characterized in that the pawl (16) and key slide (10) are made of plastic.