DE2748869B2 - Device for interrupting the circuit of electrically powered typewriters and other office machines - Google Patents

Description

The invention relates to a device for interrupting the circuit of electrically driven Typewriters or similar office machines of the type specified in the preamble of claim 1.

In office machines, in particular booking and calculating machines with machine cladding, the one Have hinged or removable hood cover, switch assemblies are provided that open the machine's electrical circuit when removing the hood cover and when putting on the cover close again.

An embodiment of such a device has become known (DE-OS 23 35 582), in which on A hood cover is attached, which protrudes into the cladding hood when the cover is closed and at the end of which a cam is arranged engages in a recess of a pivotably mounted locking lever, the same with cooperation a contact lever and a release lever actuates a microswitch. This solution of the contact breaking device largely fulfills the Requirement of safety in the workplace, however, is complicated in construction as well as handling because the circuit only after closing the hood cover

ίο can be closed via an engaging rod after pressing a function key. Also is a special closed position for the case of repairs or normal maintenance work with the hood open.

There is also a device for interrupting the circuit for electrically powered typewriters known (DE-OS 14 36 748), in the case of Folding up a cladding hood cover actuates a slide switch that is under spring tension which in turn acts on a microswitch. The slide switch works with a pawl together, which is lifted out of its locking position by removing the panel cover and the interruption of the operational readiness of the Machine causes. However, it turns out to be disadvantageous that when the machine is subsequently put into operation, after the casing cover has been put back on again, a pushbutton must be pressed each time. Another The disadvantage of this solution is that it is at removed cover is possible that Make the machine ready for operation by hand, even unintentionally. Also with this Set up the individual functions, such as B. "On", »Off« etc. can be set with a relatively large number of parts. Therefore the production is complex.

The object of the invention is therefore to provide a device that is simple in construction and operates reliably to break the circuit with a service position that is also easy to use and meets the VDE safety regulations

The problem posed is achieved according to the subject matter of the characterizing part of claim 1.

In the drawing is an embodiment of the contact breaking device according to the invention illustrated and described below. It shows

Fig. 1 is a front view of the interruption device;

FIG. 2 shows a side view of the device according to FIG. 1;

F i g. 3 a detail of the attachment with a cross recess.

On the frame, not shown, of a z. B. typewriter a base plate 1 is fixed under the cover, not shown, of the machine, which carries a contact breaking device, wel marriage with a flip-up or removable Hood cover 20, which is provided with a downwardly protruding finger 21, cooperates. This safety interruption device comprises an im Electric drive motor circuit (not

M> shown) microswitch located on the typewriter 15 with a resilient switch lever 16, a switch slide 2 which is provided with an upper guide slot 3 and a lower guide slot 4 and which is vertically movable on guide pins 3a and 4a, respectively.

The slide switch 2 is under the constant train of a coil spring 7, which tries to move the slide switch upwards. At its lower end the slide switch 2 has on the microswitch

15 facing side a sliding edge 5 which has a recess 6 and on which the switching lever 16 of the microswitch 15 rests with a roller 17. Three positions of the switching lever 16 of the microswitch 15 can be reached via this sliding edge 5 and recess 6, namely closed position A, open position Federal Service position C.

In addition to the two guide slots 3, 4, the slide switch 2 has an elongated one in its central part Cutout 13 through which a near the lower guide pin 4a in the base plate 1 in Point iOa anchored leaf spring 10 passes through which at its upper end carries a retaining bolt 11, which in the guide slot 3 of the slide switch 2 engages and with the cover 20 open, v / o the sound slide 2 has been brought by the spring 7 in the open position ß, the further movement of the same upwards prevented

At the upper end of the base plate 1 an angled attachment 8 is attached, which has two intersecting contactors 9, in front of which contactor 3a serves as a passage opening for the slide switch 2 and a slot 96 for the insertion of the cover finger 21 adjustable and lockable on screws 8a. Due to its geometric arrangement and the narrowness of the slots, the attachment 8 prevents the slide switch 2 from being pushed into the closed position A with the VDE test finger

To achieve the service position C of the dome lid 20 is opened, and thus the slide switch 2 and the micro switch B is brought to the open position 15. Then, the retaining pin 11 and with it the leaf spring 10 by means of the tool W is through the opening 12 in the base plate 1 and through the guide slot 3 in the direction of the arrow; pushed away until the bolt 11 no longer holds the slide switch 2 on the lower edge of the guide slot 3 and the slide switch is pushed further upwards by the tension spring 7. As a result, the switch lever 16 of the microswitch 15 is brought into the service position C through the incline of the recess 6 The bolt 11 of the leaf spring 10 slides on the switch slide 2. If the hood cover 20 is closed again, the slide 2 is closed by the cover flip.ger 21 pressed down and thus brought to the closed position A via the open position B ir. During this pressing down, the retaining bolt 11 is pressed again into the guide slot 3 of the slide switch 2 so the next time the cover 20 of the switch lever 2 is opened again through the bolt 11 is held in the open position S.

The advantages achieved by the invention are, in particular, that the contact interruption device according to the invention also has a secured service position and all other functional positions, even the release of the service position, in the simplest way by opening and closing the hood cover 20 can be reached without further manipulation.

For this purpose 2 sheets of drawings

Claims (3)

Patent claims: 1. Device for interrupting the circuit of electrically driven typewriters or similar office machines, with a cover that can be swiveled up, a spring-loaded slide switch that can be acted upon by this cover cover and that operates a microswitch, and with a holding device that interacts with the slide switch and counteracts the force by hand a spring can be disengaged, characterized in that: ß the slide switch (2), which is slidably guided on a base plate (1), is provided with an upper guide slot (3) for the holding device, designed as a retaining bolt (11), which (11), located at the lower end of the slot, the slide switch (2) with the cover (20) open in the open position (B) which interrupts the circuit and is arranged by means of a spring (10) on the base plate (I) in such a way that it is released of the slide switch (2) additionally guided in a lower guide slot (4) into a The service position (C) closing the circuit with a tool (W), which is smaller than the VDE-Prüffmger, through an opening (12) in the base plate (l) can be pushed out of the upper guide slot, so that dta: slide switch (2) pulled into the service position (C ) by the tension spring (7) and when the lid (20) is closed again directly over the open position; (B) is brought into the closed position (A) . 2. Device for interrupting the circuit according to claim 1, characterized in that at the end of the slide switch (2) facing the cover (20) an adjustable attachment (8) with a cross slot (9) is provided, one of which is a slot (9a ) serves as a slide passage opening and the other slot (9b) for immersing the lid catcher (21). 3. Device for interrupting the circuit according to claims 1 and 2, characterized in that the slide switch (2) on the side facing the microswitch (15) has an edge (5, 6) formed in such a way that the adjacent switching lever (16) of the Microswitch (15) determines the closed, open and service position (A, B, C) of the microswitch (15) depending on the position of the slide switch (2).