DE2944465C2 - Switching device for interrupting the circuit for electrically driven writing and the like. Office machines - Google Patents

Description

The invention relates to a switching device for interrupting the circuit for electrically powered typewriters and similar office machines of the im Type described in the preamble of claim 1

There are switching devices in power-driven office machines with a hinged or removable ' ble casing cover become known (DE-OS 36 748), which when lifting the casing cover the operational readiness of the machine with cooperation interrupt a microswitch and restore it when the cover is put on. Generally meet Although such devices the requirement of safety in the workplace, but their handling is relatively awkward, the circuit far behind Closing the casing cover only after pressing a function key above a linkage can be closed.

There is also an additional closed position provided, which enables repair or maintenance work to be carried out on the machine, even when it is open Casing cover to carry out. In this case too, the handling is rather complicated after the individual functions of the switching device, such as closed, open and service position only through special actuators are adjustable, the Restoration of operational readiness from the Service position requires three work steps

Another known switching device of this type (DE-AS 27 43 869) fulfills all of the simple Operation requirements, such as a secured service position, with all functional positions, even the release of the service position, through simply opening and closing the cover can be reached without further manipulation. These

ίο Switching device proves to be disadvantageous in that it contains a relatively large number of components, which has an unfavorable effect on the production price

The invention therefore has the task of providing a to create functionally reliable switching device that

! ■> is economical to manufacture and easy to use

This object is according to the invention after Subject of the characterizing part of the claim

1 solved

An embodiment of the invention

Switching device for circuit interruption is explained in more detail below with reference to the drawing. It shows

F i g. 1 is a front view of the switching device with the cover closed, in the closed position position of the switch,

F i g. 2 Front view of the device with the cover lifted in the open position of the switch,

3 side view of the device with the cover lifted in the open position of the switch,

jo Fig.4 front view of the switching device with lifted cover in service position of the switch with indicated side view of the upper

End of the device. On the side wall of the frame, e.g. one

Typewriter, (not shown) is a holding plate 1 fixedly arranged, which carries a switching device for breaking the circuit and which with a Fold-up or removable cladding cover 6 interacts with this for the safety of the Operation provided -'interfc-calculation device contains a slide switch 4 designed as a leaf spring and slidably mounted in the holding plate 1, which at its lower non-actuated end has a preferably U-shaped bend 5 as a spring

The spring, which acts against the direction of actuation A , can also have a different design, e.g. B. in the form of an arc, a serpentine line or the like. Have. It tries to push the upper part of the slide switch 4 against the arrow A.

Thus, the holding plate 1 also carries a known microswitch 8 in the circuit of the typewriter, the spring-loaded switch pin 8a of which faces the flat side of the slide switch 4 and is resiliently in sliding connection with the same

At the upper end of the retaining plate 1, a protective bracket 2 is attached to the lifted Cover cover 6, the upper end of the slide switch 4, which cooperates with this, resiliently to the Concern comes (Fig. 3). In the middle area opposite

μ above the switching pin 8a of the microswitch 8 is the Sehaltschieber 4 is provided with a bend 7 serving as a switching curve, which when the Fairing cover 6 is brought into a position exactly opposite the switching pin 8a, whereby the same

β; is released and the microswitch 8 is thus opened is (Fig. 2). So the machine is switched off.

Except in this open position, the switch pin 8a is constantly pushed in by the switch slide 4 in

UGE, d _t h. in the closed position, held with the cover 6 closed, the slide switch 4 being in its lowest position (F ί g, 1), in the area above the bend 7. To the closed position of the microswitch 8, ie the service -Position, to be reached with the cover 6 lifted off, the upper end of the slide switch 4 is swiveled out by means of a tool (not shown) that can be attached to the provided hole 9 outside the edge 3 of the protective bracket 2 against the spring force of the slide switch 4 transversely to the direction of actuation and via the Edge 3 pulled out. In this case, the switching pin 8a is pressed in by the surface of the slide switch 4 below the bend 7 and the closed position of the microswitch 8 is thus restored. From this service position, by simply closing the cover 6, the slide switch 4 is pressed down, its free end initially sliding under the edge 3 of the protective bracket 2 again. Thus, the switch 8 is brought back into the operating closed position by the slide switch 4 via the open control. To simplify the construction, the bend 7 can be used to guide the slide switch 4 at the same time. For this purpose, it is advisable to arrange the bend 7 so that it lies in a slot 1 a of the holding plate 1. This gives the

ι υ slide switch 4 during its movements a good one Lateral guidance without the need for additional guide means, as in the prior art.

The advantages achieved by the invention are therein

to see that the interruption according to the invention

The device comprises a minimum of components, one has a secure service position and is easy to use

For this purpose 2 sheets of drawings

Claims (4)

Patent claims: 1. Switching device for interrupting the circuit for electrically powered typists and similar office machines, with a removable or pivotable casing cover and a spring-loaded slide switch for actuating a microswitch, which can be displaced from this cover in a holding plate, characterized in that the slide switch (4) by one at its not actuated end counter to the actuation direction (A) resilient bend (5) is designed to be self-resilient 2. Switching device according to claim 1, characterized in that the slide switch (4) has a bend (7) designed as a Scbaltkurve, which on the one hand actuates the microswitch (8) and on the other hand the slide switch (4) in a slot (ta) of the holding plate ( 1), the position of this bend (7) relative to the microswitch (8) determines the closed, open or service position. 3. Switching device according to claim 1 or 2, characterized in that on the cover (6) facing end of the holding plate (1) a protective bracket (2) is attached to which the slide switch (4) in the open position with its the casing cover (6) cooperating end resiliently against the actuation direction (A) and in the service position resiliently in its end area transversely to the actuation direction 4. Device according to one of claims 1 to 3, characterized in that uem with the Covering cover (6) interacting and transversely to the actuation direction resilient end area The slide switch (4) has a hole (9) for attaching a tool for pulling out of the slide switch (4) over an edge (3) of the protective bracket (2)