DE1195575B - Device for braking and locking a work spindle on automatic turning bars - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

Number:
File number:
Registration date:
Display day:

B 23b

German class: 49 a - 4

1195 575
J13877Ib / 49a
October 21, 1957
June 24, 1965

The invention relates to a device for braking and locking a work spindle on automatic lathes in at least one specific one Position with a braking device that can be driven by a motor at creep speed and with the work spindle, which is uncoupled from the main drive, can be coupled via a coupling, and with a Latching device with a latching element in a latching of the work spindle upon arrival of the same in the predetermined position occurs.

When machining parts on an automatic lathe, it is often necessary to Carry out operations that can only be carried out when the workpiece is at a standstill. For example In some cases it is necessary to mill surfaces on a workpiece or to drill a cross hole to drill. It is now known to shut down the work spindle in order to carry out these operations and then to switch them on by a certain angle via a switching device. The switching device is operated via a control shaft of the lathe, and also are on the reversing device for stopping the work spindle or reversing its direction of rotation, others Curves are provided to provide the required braking and locking in the concerned To achieve positions. This type of control is relatively cumbersome, and besides, it is required that the reversing device not only stopped the work spindle, but also during the switching process is driven again. This alone results in complicated switching processes, and there are a number of clutches required to make the movements in the desired manner Way to perform.

In another known clamping device for workpieces on lathes is to brake the Work spindle a multi-disc brake is provided, which first completely stops the work spindle and which is then ventilated again. Now an auxiliary motor is switched on, which drives a friction wheel, which is fixed by axial displacement in a non-positive connection with one on the work spindle The friction wheel comes up so that the work spindle is now slowly turned. In a predetermined turning position the teeth of a clutch fall into the friction wheel, which at the same time switches off the auxiliary motor and the work spindle is locked.

It has also already been proposed in a multi-spindle automatic lathe to stop the Work spindles in a certain angular position to attach a device to the spindles in Device for braking and locking a work spindle on automatic lathes

Applicant:

Index works by K. G. Hahn & Tessky,

Esslingen / Neckar

Named as inventor:

Karl Spohn, Obereßlingen / Neckar

to hold a predetermined position. The arrangement is such that after uncoupling the Spindles from the main drive brake the spindle and then an auxiliary motor with creep speed be rotated until the spindles are locked in a certain position by locking bolts. The auxiliary motor is then switched off.

In the two aforementioned constructions is a braking device for braking the Working spindles and also an auxiliary motor to drive the spindles at creep speed are required, which must then be switched off after reaching the predetermined locking position.

According to the invention, the novelty of the device mentioned above is that the Braking device is a rotary magnet and the locking device is a locking disc with a plurality of Has latches into which the latching element can fall one after the other. The rotary magnet is used in this design both for braking and for driving the work spindle at creep speed. aside from that the rotary magnet can be completely stopped without being damaged so that it does not need to be switched off in the rest position of the work spindle, which is the case with several consecutive Rest areas is particularly cheap.

The rotary magnet can be connected directly to the work spindle, if necessary via a coupling be connected, or it can be a gear between the rotary magnet and work spindle, preferably a reduction gear may be provided.

The braking takes place particularly quickly if the direction of rotation of the rotary magnet matches the direction of rotation is opposite to the decelerating spindle.

The electrical switch for switching on the rotary solenoid, which is approximately at the time of switching off the work spindle can be switched on

509 537/160

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should, can by any, with the control of the The shifting of the coupling sleeve 25 ge work spindle coherent parts of the rotation is done via a shift lever 36, which at 37 bank controlled. For example, the (cf. in particular FIG. 2) can be pivotably mounted sem purpose, a control lever can be provided, which gedie over and over a curve 38 of a reversing shaft 39 Reversing shaft is controlled and via which the 5 is controlled.

the actual switching device is in the active position. The reversing shaft 39 is

is brought. This control lever can be connected to the clutch 42 with the so-called auxiliary control shaft 43

Device connected via a connecting rod can be connected, the drive means, not shown

be, and which continuously rotates approximately in the longitudinal direction of the rod. F i g. 4 shows the development of the

Any movement that takes place can lead to actuation of the electronic curve 38, and it can be seen from this development.

tric switch can be used. lent that this curve 38 consists of three parts, viz

In the drawing is an embodiment of a middle part 45, the upper part 46 and

Invention and several examples of application dar- the lower part 47 consists essentially

posed. It shows each encompass approximately 120 °. When activating the

Fig. 1 is a front view of an automatic quick-release coupling 42 then moves the lathe, control shaft 39 each by a third of a turn, so

F i g. 2 is a schematic partial view according to FIG. 1 that the sensor pin 50 of the shift lever 36 the reversing device and the switching device, from the middle position to the upper or lower on a larger scale than Fig. 1, moving for a better dot-dash position, and thereby Representation of individual parts of the lathe omitted 20 the sliding sleeve 25 is in each case from a center, idle position to the position for right or

F i g. 3 is a partial view along line 3-3 of FIG. 2, counter-clockwise rotation. Looking at FIG. 4 is

F i g. 4 a development of the control curve in order to note that the control curve is actually

control device, is rotated and therefore the sensor pin 50 of the

F i g. 5 to 9 different positions of the shift lever in reality only to the left

organs and the cam disk, and it is swiveled to the right in the direction of the double

F i g. 10 a schematic representation of the arrow.

Processing of a workpiece after stopping There are also two more on the reversing shaft 39

the work spindle, cams 53 and 54 arranged, each with a

11 shows a front view of the workpiece according to 30 control lever55 or a locking lever56.

F i g. 10, work together. The last two levers mentioned

F i g. 12 a side view of a double-sided arch are arranged pivotably at 58 and 59 and white

shaped milled workpiece, sen locking teeth 61 and 62, according to

13 shows a front view according to FIG. 12 and FIG. 2 are locked together. At 64 there is one

F i g. 14 is a front view of a workpiece 35 denotes a spring, which the locking lever 56 in

with off-center holes, to swivel clockwise and thus the

F i g. 15 the workpiece according to FIG. 14, whereby each lock tries to maintain.

but a thread has been cut into the holes. In Fig. 4 are in addition to the sensor pin 50

In Fig. 1 is the bed of an automatic pivot - the control pins 66 and 67 of the two levers 55

bank labeled 10. 40 and 56 are located on this bed, and it is now the arrangement

a turret slide 11 is met with a turret so that when the sensor pin 50 is moved

head 12. The latter has six stations, and along the curve part 46 approximately at the end of this

For the sake of clarity, only a single curve part of the control pin 67 is on the cam 54

Station occupied by a cutter 13. hits. This is the control pin and thus

On the bed 10 there is also a bearing block 18 attached to the locking lever 56 according to FIG. 2 opposite in which a work spindle 19 is mounted. swiveled clockwise and so the up the one shown in FIG. 1 left end is canceled by locking itself with the control lever 55. In known means in the work spindle ent-20 a workpiece in the idle position of the shift lever 36 attached, which will be provided with side surfaces 21 speaking of the extended position of the feeler target. 50 pin 50 in FIG. 4 is the interlock between

Ver den levers 55 and 56 are located on the work spindle. If now the sliding sleeve 25, which switched on again when moving to the left work spindle and thus the or to the right via cones 26 and 27 sensor pin 50 from its fully extended position a connection with a rotatable on the work spindle according to Figure 4 in the lower dash-dotted position, but the immovably arranged coupling 55 is moved away, the control pin 66 of the moves treatment piece 30 and 31 causes each of which a control lever 55 on the cam 53 along. Here sprocket 32 and 33 is attached. by turning the control lever counterclockwise

The drive of the work spindle takes place in itself so far pivoted until the locking occurs again in the known manner, not shown, via the two locking teeth 61, 62. To be chain wheels 32 and 33 by closing the clutch 60 it is important to note that when switching from 26 or 27 and since the chain wheels always rotate in the opposite direction in one direction of rotation, the result is that the control shaft is rotated in this way is that always ent-shifting the sliding sleeve 25 is locked and locked again.
Left or right rotation. If necessary, the chain wheels can be connected to the control lever 55 in the same direction, but articulated to rods 70, which run at their other different speeds, so that when an actuating arm 72 is turned over, the direction of rotation as a whole does not switch , but only designated by 73, the speed changes around a pin 71. hinged three-armed lever. The Ver-

5 6

binding rod has a lug 74, with the work spindle 19 can exercise. The torque With the help of an electrical switch 75, the rotary magnet acts on the torque that can be running work spindle against, so that the

The aforementioned three-armed shift lever has the work spindle being braked quickly. For example with one Ratchet lever 77 and a detent lever 78 5 occurs when the work spindle comes to a standstill

on. A spring 80 tries to engage the three-armed lever latching tooth 81 in a latching recess 83

turn clockwise. and thus the ratchet wheel 82 in a certain

The detent lever 78 acts with a tooth 81 to lock in position. Now, when a ratchet wheel 82 is stopped, a number of notches 83 are carried out in the predetermined and locked spindle a certain working angular distance, and after one operation. In addition to the notches, a cam 84 for a specific time meets a cam 99 which is provided further (see FIG. 3). The ratchet wheel is attached to the running cam disk 96 against the tooth 91 of the work spindle, and next to it is a toothed pawl 90. pivoted to the stop (see FIG. 6), and on-The latter is driven by a rotary magnet 88 via an electrical coupling 87 to close when the cam disk 96 continues to rotate. the tooth 99 moves on the ratchet tooth 91

The aforementioned ratchet arm 77 has a switching over and pivots this and thus also the

pawl 90, which has a tooth 91 and a switching arm 77 and the locking arm 78 so far that the

Bolt 92 is pivotable. A spring 94 tries to lock between the locking arm 78 and the

the ratchet in the in F i g. 5 position shown 20 ratchet 82 is canceled. This state is

to press, and the pivoting movement is already achieved in the opposite position according to FIG. So-

clockwise is through a stop 95 more the ratchet is under the influence of the

limited. Rotary magnet 88 rotated further, and tooth 81

The ratchet arm 77 acts with a cam disk runs on the next cam 84 of the ratchet wheel 96 together, which are fixed on the control shaft 97 25 82 on. As a result, the ratchet lever 73 is removed and by the auxiliary control shaft 43 via a corresponding to the figures clockwise so far 98 is driven. On the cam plate pivots that the ratchet tooth 91 is there The distance between the cams 99 is adjustable and the fixed cam 99 is released. This allows the displaceably arranged, and also has the cam pawl 90 disengaged under the action of the spring 94 a raised curve piece 100 and a swinging 30 (see Fig. 8) and thus comes safely off against offset curve piece 93. Cam 99 free, so that incorrect switching is avoided

The following is the mode of action of the. The rotary magnet 88 rotates the ratchet wheel and

Switching device will be explained in more detail. so that the work spindle continues until the detent lever

When the reversing shaft 39 is rotated by a 78 under the action of the spring 80 in the

Third turn from a working position into the following recess 83 of the ratchet wheel 82

The idle position can take effect in the one already described and the spindle stops again. So-

Way the locking of the two levers 55 and 56 is carried out the next processing,

lifted, and it can now the control lever 55, This switching of the ratchet and thus the

the connecting rod 70 and the three-armed switching work spindle then repeats itself accordingly

Lever 73 under the action of spring 80 moves 40 the number mounted on the cam disc

will. If this unlocking occurs at a point in time teeth 99.

happens in which an actuation of the Schaltvorrich- The curve pieces 100 and 93 can also on

device is not intended at all, for example then, be arranged on a separate cam

if the work spindle quickly runs out of a left or a corresponding sequence element,

rotation can be switched to a clockwise rotation 45 If the control lever 55 is

should, the arrangement is made so that while writing is locked again, the locking moves

During this work phase, the pawl 90 with its connecting rod 70 according to FIG. 2 to the left, whereby

Tooth 91 on the curve piece 100 when all parts are released, the positions shown in this figure

Unlocking strikes, and take the height of these curves, at the same time the switch 75 is

piece 100 is such that only a short turning 50 opens and thus the electrical coupling 87

movement of the shift lever 73 in the clockwise direction is released.

measure F i g. 2 is possible. In Fig. 10 and 11 this is the case in Fig. 1 shown

device not activated at all. Workpiece shown larger, and it can be seen

If a switch is now made to idle, two surfaces 21 are milled onto the workpiece

position, as described above, then carried out, 55. A transverse hole 102 is also provided,

when the cam piece 100 on the pawl 90 pierces this with the aid of a transverse drill 103

has already passed and the curve piece 93 can be.

opposite (cf. FIG. 5), the switching device can be at the workpiece 105 according to FIG. 12 and 13 Lever 73 under the action of the spring 80 in the clockwise direction with the help of a dash-dotted line Pivot a little further and the 60th cutter 106 assumes two partial cylinder surfaces 107 while the connecting rod 70 and milled.

Control lever 55 with which, as already mentioned, ent- The workpiece 110 according to FIG. 14 and 15 shows in

is locked. This short longitudinal movement of FIG. 14 four eccentric holes 111, which according to

The rod 70 will be provided with a thread over the catch 74 of the switch 75 Fig. 15. Here too

and thus also the clutch 87 is switched on, so 65 the work spindle is stopped for machining,

that the rotary magnet applies its torque to the tooth. Finally, it should be noted that the

wheel 86 and the meshing with this gear finding easily even if only one is arranged

85 on the detent disk 82 and thus on the coupling, for example 27, 31, can be used

can. It is then only necessary to change the curve of the reversing shaft accordingly.

Claims (6)

Patent claims: 1. Device for braking and locking a work spindle on automatic lathes in certain positions with a braking device that can be driven by a motor at creep speed and with that of the main drive uncoupled work spindle can be coupled via a coupling, and with a locking device, which falls with a latching element into a latching of the work spindle upon arrival of the same in the predetermined position, thereby characterized in that the braking device is a rotary magnet (88) and the locking device has a locking disc (82) with a plurality of notches (83) into which the locking element (73,81) can occur one after the other. 2. Device according to claim 1, characterized ge ao indicates that the direction of rotation of the rotary magnet the direction of rotation of the expiring spindle is opposite. 3. Device according to claim 1 or 2 with a cam disk, which is from the control shaft of the as Lathe is driven and cooperates with a pivotable switch lever, characterized in that that the locking element is a pivotable locking lever (78) which is connected to the switching lever (77) is firmly connected, both levers being pivotable about a common axis (71). 4. Device according to claim 3 with a reversing device for the direction of rotation of the spindle, which acts on the shift lever via a control lever, characterized in that for Switching on the rotary magnet (88) an electrical switch (75) is provided, which by the control lever can be switched on when the work spindle has reached the idle position. 5. Device according to claim 4 with a switching device which can be released via the control lever is, characterized in that the switching device has a connecting rod (70) is connected to the switch lever, the electrical switch (75) via the connecting rod is switchable. 6. Device according to one of claims 4 and 5, characterized in that the electrical Switch (75) can be switched on shortly before the latching elements (73, 81) engage. Considered publications:
German Patent Nos. 736 212, 831 475;
German interpretation document No. 1 010 798. 1 sheet of drawings 509 597 / I6Q 6.65 ® Bundesdruckerei Berlin