DE392174C - Switching device for automatic swivel arms - Google Patents

Description

(D 4IS97

In the case of automatic lathes, which are used to produce a larger number of the same Parts, e.g. B. Sahrauben, it is an advantage if you can see the movements of the sled, Steel holder and the like at different speeds, e.g. B. slowly for the operation and quickly for the gear shift.

This task is known so far with the ίο th facilities solved in various ways, e.g. B. in that the control shaft for the Slide, steel holder, the material tension, the feed, etc. for the operation slowly, for the switching times, however, is moved quickly.

The measure of this rapid movement is, however with these devices depending on the inertia of the masses to be moved.

It is also already known to perform this task by arranging auxiliary control shafts to solve. In the devices of this type, the auxiliary control shafts are during the actual operation, they are used to carry out a switching process or an unproductive work cycle through the control shaft with a high-speed shaft

coupled and switched off again after completing the work, usually after one turn.

However, these facilities are only suitable for those processes which are in the for Production of a workpiece required time periods quickly carried out once can be, such as B. Material feed and the like. But if it is sled, Stahlhaiter and the like, which perform movements during the operation, in the switching time are to be brought back as quickly as possible, these arrangements are not sufficient. It then there are other complicated mecha-

iS nisnia necessary, such as B. that with some Automatic crank mechanism for rapid reverse motion of the turret slide.

According to the present invention, the stated object is achieved by simple means solved that the controls arranged for high-speed switching (e.g. an auxiliary control shaft) are not permanently connected to the slow-running main control shaft, but rather during the working time (for the commute) from her and during the dead time (for return and Circuit) are driven by a high-speed shaft, where the quick-release organs, in order to achieve a proper cooperation, after the expiry of the production of the workpiece necessary time period to the curves of the main control shaft the same must take a mutual position. Furthermore, the relationship must

Angular path during the shifting time Complete angular path for a workpiece

be as small as possible for the control shaft, as this expresses the time lost for them. For the high-speed switching organs, however, it is necessary for the good formation of their parts (^ curves) to choose this ratio to be significantly larger. It becomes very favorable at a value of about ¹ J ₂ , since the curves for advancing and retracting then have about the same slope.

These conditions can be different in the device according to the invention Way to be fulfilled.

First of all, the control units for quick switching can be used during the operation by means of a translation from the main control shaft z. B. at half the angular velocity are driven. During the process, the main control shaft makes a little less than a full turn, the High-speed switching devices (auxiliary control shaft) hardly half a turn in the assumed case. During the gear shift, the main control shaft runs at a constant speed farther and completes the slight path missing in one turn, while the gearshifting organs, from the Rapid control shaft driven, the part falling on a full revolution, in the assumed Fall a little more than half a turn, back it up. At this point in time, the quick-action organs are in place again in the same position to the main control shaft, and the drive occurs through the latter back on.

A special form of embodiment enables the auxiliary control shaft to be arranged coaxially with the main control shaft as a tube and to be coupled with it during the operation. In order to achieve this, the curves attached to the j main control shaft must be executed for the production of two work pieces, so that the main control shaft makes a rotation of 180 ° for each work piece. Then the quick-change curves carried by the auxiliary control shaft have to take the same position on the main control shaft after completion of each piece to the curves j on the main control shaft, perform a rotation of 360 ° at the same time and with the same speed during the operation; speed like the main control shaft rotated and with; to be coupled to her. Driven by the high-speed shaft they put remaining, little j more than i8o ^c amount angular gone: back to then take over the second offset to i8o ° bends "the main control shaft same position as .for the beginning of the operation on the previous' · workpiece compared to the first parts of the curve.

There are two embodiments in the drawing a switching device designed according to the invention shown. [Fig. Ι shows the first embodiment in ! one through .the central axes of the main control shaft and the auxiliary control shaft j cut.

Fig. 2 illustrates the second embodiment in a plan view, and

Fig. 3 in a section along the line AB of Fig. 2.

■ In the embodiment of Fig. 1 for switching the procedure is the auxiliary control shaft α of the slow-running main control shaft b to the high-speed shaft c are furnished taken.

Then passes to a on the one end of the auxiliary control shaft "slidably seated, and with their rotating Muffed a curve (or nose) is provided e, which / a fixed ring piece g with a correspondingly shaped curve g under the pressure of coil springs ¹ in engagement, when the two curves coincide with each other when the auxiliary control shaft rotates. Here, the latter is in the direction of

302174

of the arrow χ moved. This shift causes the release of a clutch, which is formed by two recesses i and two lugs k provided in the hub of the gear h driven by the main control shaft, which is formed on one side of a cam part I firmly connected to the auxiliary control shaft α so that the drive connection between the main control shaft and

ίο the auxiliary control shaft is interrupted. At the same time, the aforementioned displacement of the auxiliary control shaft causes a toothed clutch m to close between the curve part Z and that of the high-speed shaft c.

t5 driven gear n, so that the auxiliary control shaft is now driven very quickly by the latter. After the auxiliary control shaft has been shifted, ie after switching over to the high-speed shaft, 'the switching spring is switched off by the curve e running onto the end face of the ring part g and its pressure effect is thereby canceled. "

The switching back of the auxiliary control shaft to the main control shaft is carried out by a helical spring ο acting on the cam part /, which is weaker than the switching spring g ¹ and only comes into effect when the latter is disengaged in the manner described above and which is connected to the auxiliary control shaft α allows rotating lugs k to jump into the recesses i of the gear wheel h driven by the main control shaft b , and indeed the lugs always turn one recess further, so that with two recesses and lugs which are arranged 18o ° opposite one another, a full turn i through the Auxiliary control shaft α is completed in the same time as the main control shaft b needs. The transmission ratio of the gears between the shafts a and b must be 2 to ι in this case.

In the embodiment of the device according to Figs. 2 and 3, the engagement of the auxiliary control shaft α is switched over to the high-speed shaft c by a double lever p ¹ , p ² , one arm ρ ^{τ of which is} under the action of a powerful tension spring q , and the other Arm p ^{2 is} fork-shaped. A nose r is attached to the inner fork arm, which is held by the spring q against the sleeve t connected to the auxiliary control shaft α . A recess s is made in this sleeve t , into which | jump in the nose r, once the sleeve by t \ α, the rotation of the auxiliary control shaft takes the decision \ speaking position. (Since the word spatungi sicii on Abib. 2 is on the underside of the socket t , the direction of rotation of the socket is reversed, as indicated by the arrow.) Here, the double lever with its lever arm p ² moves one on the Auxiliary control shaft longitudinally displaceable, but not rotatably arranged and with the sleeve t through slot guides u engaging coupling sleeve v. As a result, a spur or nose coupling w connecting this coupling sleeve to the hub of the gear h driven by the main control shaft is released and a toothed coupling χ ¹ connecting the coupling sleeve ν to the gear η driven by the high-speed shaft c is quickly closed and the coupling sleeve ν is faster Offset.

When the engagement nose r of the double lever p ¹ , p ² emerges from the recess ^ of the sleeve i, which occurs when this nose r runs onto the sloping end face of the recess 5, the coupling sleeve -0 is activated by a helical spring y surrounding the auxiliary control shaft held under pressure in the opposite direction. The tooth coupling χ ¹ is released and the nose coupling w closed again as soon as the noses w face the corresponding recesses in the sleeve set ¹ . To enable the switching process described first, the pressure effect of the spring q on the coupling sleeve ν must of course be stronger than the counteraction of the spring y. The lever arm is bifurcated and ρ ² summarizes the coupling sleeve ν go at two diametrically opposite locations, so that the \ ^r erschiebungskräfte in the axial direction on the coupling sleeve act.

Claims (2)

P ATENT claims: 1. Switching device for automatic lathes, characterized in that a control cams for idle and work movements bearing, constantly rotating ioo-existing auxiliary control shaft (a) during the working time of a slow main control shaft (6) and during the dead time of a high-speed shaft (c) is driven. 2. Switching device according to claim 1, characterized in that an axially displaceable, but non-rotatable and in the axial direction of two oppositely acting and different strong springs' influenced coupling sleeve sits, with the stronger Spring is controlled by a cam. 1 sheet of drawings.