DE1777231A1 - Switch-off device for machine tools - Google Patents

Description

ALfRSD TEVSS GMBH F 355 © Prankfurt (Main) Pat / Wed / Sn

25 September 1--68

Disconnection device for machine tools

Dl · invention relates to a Abschälteinrichtung door machine tools, particularly pneumatically working · air screwdriver.

The switching off of a Luftsohraubare took place so far, if not by the operator himself, via a time relay ι the Einohaltzeit the Sohraubvorgangs must Always check for the maximum screw side. Since not every screw when putting on the Screws eyes like in the Oewindeggang touches bxw. the wrench head when attaching to the screw head doesn’t always lock into place immediately, an uncontrollable amount of time is lost, so that the Response of the time relay always gives the uncertainty that the air screwdriver will not get the full output The applied torque is transferred to the screw, i.e. it has not yet been tightened.

The object of the invention is to use a suitable device to "switch off the Sohrauber first" when the screw itself no longer turns, so that the above-mentioned uncertainty is avoided.

According to the invention this is achieved daduroh, dad one with two free jet nozzles, swel these opposite Catch nozzles and one with the screwdriver « A pneumatic pulse generator equipped with a pneumatic pulse generator that rotates around the shaft Logic circuit is connected, the output signal on a control valve in the pneumatic

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Main line sun Sohrauber lies »is given · The pneuamtiaohe pulse generator and the entire pneu matieche logic circuit are made by a subsidiary circuit also fed to the main pneumatic circuit. The free jet nozzles and catching nozzles are housed opposite one another in an annular body, which is screwed to the screwdriver bracket and which is given an approximately U-shaped profile through an annular recess in the inner wall.

Oils worked on the circumference of the interrupter wheel Interrupter lobes protrude into the recess of the ring body between the free jet nozzle and Pangdtise in such a way that "in every position of the interrupter wheelβ a free jet nozzle" is the speaking catch nozzle pneumatically connected and the other free jet nozzle from the corresponding catch nozzle is pneumatically separated.

Air ducts are parallel to the free jet nozzles with one Droesel hole each to the pulse output at orderly. The momentum outputs of the catches are each with a pneumatic HC element, consisting of a nozzle and an air reservoir and the negated one Input of an inhibition member connected. The outputs of the pneumatic KC oil song habon Connection with the second input of the inhibition element and with the inputs of a common one Or-Qliedea.

The inhibition member essentially has the character of an Or-Gli.des with two lengths, of which one is noted, its output is related to the atmosphere.

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The OR-member, which its binary pulse from the pneumatic KC-OIiOdern is a Diniirleleitungsveretttrker downstream, which is followed by the control valve for the pneumatic main circuit.

In a special embodiment of the invention, a pneumatic lock is provided in the main circuit, which is to prevent cfcfl the screwdriver prematurely takes off.

With the help of the accompanying drawings, the invention and its mode of operation are as follows ntihor describedι

Flg. 1 shows a longitudinal section through the mount on the screwdriver bracket Impulse generator,

Fig * 2 shows a cross section through the pulse generator, from detn the shape of the Breaker wheel can be seen,

Fig. 3 shows the pneumatic interconnection of the logic.

There is a ring on the holder of the air screwdriver * body 11 screwed «in the diagonally opposite two Free jet nozzles 1 and two intake nozzles 2 housed are.

An annular recess in the inner wall of the annular body 11 gives it an approximately U-shape Profile. The two free-jet nozzles 1 are accommodated in one leg and the other Legs of the free jet nozzle opposite the two Frngdüsen 2, eo the outside of the friehtl diise 1 emerging air stream is in the opposite "T" inside · ηβ 2 fifth and further processed

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germ, into the recess in the inner wall of the ring body 11 that separates the free jet nozzles and catching nozzles from each other, the interrupter lobes protrude through the recesses on the fang of the screwdriver shaft 15, so that in every position of the interrupter wheel 3 the air flow »wipe the one free jet nozzle 1 and catch nozzle 2 is released and interrupted between the other pair of nozzles. On the side of the catching nozzles 2, the itapule connections 13 go to the pneumatic circuit. Parallel to the free jet nozzles f, a channel 1 * old of a droenel hole is attached in each case in the ring body 11, which is also connected to the X «pulse output 13 and is intended to prevent ▼ that the catch nozzles 2 are contaminated by the outside air · The compressed air is supplied through connection 12.

Fig. 3 shows schematically the device in the idle state including the pneumatic interconnection. From pneumatieohen Ilauptkrele "of preventing over the gate valve 8 the screwdriver 9 and the pneuaatisehen locking 1o intended" that the Sohrnuber apart prematurely, the compressed air supplies "is a part of the pressure in a ·" Nebe "- circular 17 de to supply · pneumatic Iapalsgebers and the entire pneumatic logic branched off. The FangdUeen 2 of the Iepulsgebers which it through the Unterbreeherrad 3 "are the FreiatrahldUsen 1 pneuemtieoh connected to and disconnected from them," each "it the input of a pneumatic Integretionsfcliedee k _t consist! from nozzle and air storage and the negated bit path of an inhibition member 5 of character an · Oder-Oliedes connected ι the second input of the Xn-

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hibitioneglieder 5 lies at the exit of the respective integration member 4, their reasons stuck with the atmosphere in connection. The outputs of the intogriarglioder k are in turn connected to the two inputs of a common OR element 6, the output signal of which is fed to a binary power amplifier 7 which is fed by the main pneumatic line. The amplifier 7 nc & chge switches is a Sohieborventil 8, dae in the main line to wrenches 9 and BUX * ti see pneuflia locking 1o is located. This Schieborventil above sea locks odor indicates the total pneumatic supply free.

The device works as follows:

The Sohraubvorgantf is initiated with a pneumatic impulse on the control valve f, whereby at the same time the pneumatic lock ^ o is actuated and the impulse generator and the pneumatic logic unit old feed air are supplied The resulting underbrocher flap 16 alternately releases or interrupts the air flow between a flow nozzle 1 and the opposite filling depth 2 with a rotating screw spindle. The Luftimpulsο thus obtained the Impulsgobore v> n ca · loo mm v / s cause mutual · charging the pneumatic UU gates h _t consisting of niise and air reservoir · The Speichor and nozzles are sized daJJ a full charge bai to drahunder screwdriver Wella 13 does not come bustande, then bai impula underbrewing is caused by daa ι ahlon ainua signals at the input dos

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Integration term k _t of iet directly connected to the negation "input dee Inhibitionsgliedes 5, about this negated input a quick * vent dee air store into the atmosphere · directed" Hot the screwdriver applied its full torque, the screwdriver shaft 15 comes to Stillstandι now If the pneumatic pulse generator sends a continuous signal to one of the RC Glleder k , whereby the memory can be fully charged and a pulse occurs at one of the inputs of the OR element 6, which then in turn emits an external pulse which is amplified in the pulse amplifier 7 to operate the control slide 8, so that the supply of the entire pneumatic system with compressed air is interrupted and the screwdriver 9 is switched off and the lock is exposed. The venting of the accumulator of the integration element k is initiated when the accumulator is charged by a pulse at the second input of the inhibition element, so that the entire process can be repeated immediately afterwards.

The invention achieves that the air nipple In each FnIl it is only switched off when it has applied its full torque and by blocking the so-called `` Sohrnubersplndel '' the switch-off impulse is given «Gin premature It is not possible to switch off the screwdriver *

Ks is not the same as with propellers with shut-off a safety time through a time relay to be applied, so that for mechanical mining work the cycle time is shortened.

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Another advantage is that each control device equipped with a separate disconnection device is checked against damage if the rotation speed to be transmitted is overridden by the value.

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Claims (1)

ALFRED TEVES GMBH O P 355 Frankfurt (Main) ° Pat / Mi / βη 25 September 1968 Pat ent .uipprürhe 1.) Disconnection device for machine tools, in particular for pneumatically operating pulse generators, dadetorch marked that a with at least two free jet nozzles (i) and these opposing catching nozzles (2) and one with the tool shaft (15) revolving Interrupt wheel (3) equipped pulse generator connected to a Loglkaohaltung 1st, whose Output signal interrupts the power supply to the machine tool. 2. Absohalteinriehtung according to claim Y _1, characterized in that lsi case of pneumatically operating Verkseugmasohlnen the pneumatic pulse generator with a pneumatic logic control (pneumatics) connected let, the output signal to a control valve (β), the In the pneumatic main line sum tool btv. Sehrauber (9) is given vlrd. 3. peeling device naoh claim 1 and M, gekennselohnet that the pneumatic pulse generator and the entire pneumatlsohe is fed by a secondary circuit (17) on the pneumatleokten main circuit. 109841/05 4 0 . Disconnection device according to the preceding claims, dadureh gekennselob.net « BATH ORIGINAL because ⁵ the free jet nozzles (i) and the catch nozzles (2) are housed opposite one another in an annular body (11) which is screwed to the screw holder and which is given an approximately U-shaped profile through an annular recess in the inner wall. 5 disconnection according to the preceding claims, characterized, dal those on the perimeter; of the breaker wheel (3) The attached interrupter flap (16) into the recess dws Ringkörperβ (11) between free jet nozzles (i) and collecting nozzle (2) protrude in such a way that in every position of the bottom » crusher wheel (3) a free jet dUs · (i) with the corresponding collecting nozzle (2) pneumatically connected and the other free jet nozzle (i) from the corresponding Fan ^ nozzle (2) is pneumatically separated. 6. Disconnection device according to the preceding claims, characterized! that parallel to the free jet nozzles (i) air ducts (i4) each with a droesel hole sum pulse output (13) are arranged. 7 peeling device according to the preceding claims, characterized in that the pulse outputs (13) of the collecting nozzles (2) each silt a pneumatic RC-Glled (4), consisting of nozzle and air storage, and with the negated input (16) of an Inhibitionsgiiedes (5) are connected. 109841/0540 -3- b * D ORIGINAL 8. Absohalteinrichtung according to the preceding claims, characterized, that the outputs of the pneumatic RC element each with the second input (19) of the inhibition member and with the inputs (2o, 2i) of a ge * »Solitary OR-member (6) are connected. 9 * Absohalteinrichtung according to the previous claims, characterized in that the inhibition element (5) has the character of an Oder-Oliedee with two inputs, one of which is negated (18), and that its output is pre-connected with the atmosphere · Io * disconnection device according to the preceding claims, daduroh gekennxeiohnet that the OR element (6) is a binary power amplifier (7) is subsequently followed. 11. Absohalteinriohtung according to the preceding claims, characterized in that the binary power amplifier is the control valve (8) naohgesohalte «is. 12. Shutdown device after the previous one * Sayings, characterized in that a pneumatic locking mechanism is used in the building (lo) provided let. 1098Α1 / Π5Α0 BAD ORfOtNAL Blank page