DE2952017A1 - DEVICE FOR AN INTERMITTENT DRIVE OF A ROTATING TOOL TABLE - Google Patents

Description

Company ALEE S.A., CH-6982 Agno / Switzerland

Device for an intermittent drive a rotating tool table

The invention relates to a device for an intermittent Drive of a rotatable tool carrier table of a precision machine tool for serial machining vcn workpieces, especially very small and very complex workpieces, such as ballpoint pen tips and electrical contacts, with the highest precision.

Many devices of this type are known. For example, reference is made to the machine according to CH-PS 525 065, which has two cam disk control shafts arranged parallel to one another. These known devices enable processing small workpieces with tolerances on the order of a few microns.

In some cases, especially when the workpieces are extremely small, these tolerances are still too large, which is why an even greater precision is required.

The invention is therefore based on the object of designing a device of the type mentioned at the outset in such a way that a compared to the known devices even greater precision can be achieved.

030035/0608

2352017

According to the invention, this object is achieved by:

a) four cam shafts arranged in a square, preferably in the base of the machine,

b) Devices for precise fixing or setting

of the workpiece table at the end of each movement step, the workpiece carrier table from its rotary drive is completely separated as long as it is held by the fixing devices, i.e. so while the workpiece is being machined, and

c) Lever devices for controlling the workpiece holding tongs of the table, the lever devices such are balanced so that there is no force on the table or, in the case of rotating pliers, on the bearings acts.

Further advantages, details and features of the invention result from the subclaims and the following description and the accompanying drawing.

In the drawing showing a preferred embodiment represent:

FIG. 1, from above, a plan view of a group of four arranged in the base of the machine according to the invention Curves

FIG. 2 is a front view of the machine to illustrate some of the features of the machine,

FIG. 3 shows a detail from FIG. 2 on a larger scale,

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FIG. 4 shows the front view of the machine according to FIG. 2 with further devices of the machine,

FIG. 5 shows an axial section through balanced lever devices for controlling the workpiece holding tongs and

FIG. 6 shows an axial section through the devices that hold the table during the machining of the workpieces adjust and fix.

Four cam shafts 1, 2, 3, 4 (Figure 1) are in one Arranged in a square and are driven by a motor with a countershaft (5) that moves on two toothed belts 6 and 7 transmits.

The toothed belts 6 and 7 drive via worms 8,9, each of which engages in two worm gears 10, 11, 12, 13, which with the cam shafts are firmly connected to the shafts.

An intermittently rotating table 32 is also driven by the same motor and the countershaft 5 (reduction gear) via a toothed belt 14 (Figures 2 and 3), which controls the movement of the worm 15, the worm wheel 16 (Figure 2) and the cam disk 17 (Figure 3) transmits. The table is set in the operating positions by means of rods 18, 18 (the third i _s t is not shown in the figure) 'or fixed, which are controlled by a lever system, which by a cam 19 and the worm wheel is driven sixteenth The rods actuate a blocking device which is already known from CH-PS 350.521, ie it consists of an axially displaceable ball cage 33 (FIG. 6).

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When the table 32 by means of the three rods 18, 18 '(the third is not visible) is set, he is completely free of the devices that propel him, so that its position during the machining process is exclusive is determined by the locking bars.

The feed movement of the table 32 is controlled by the cam disks Transferred via piston 2 0 (Figure 4), which can be sprung.

The workpiece grippers, which can be fixed or rotating, are controlled by a balanced lever mechanism (26, 27, 28, 29 in Figures 4 and 5) closed and opened in such a way that no forces on the turntable or in the case of rotating Pliers act on the bearings.

The balanced lever devices work as follows: The push rod 26 (Figures 4 and 5) acts on the central part of the lever 27, which in turn divides the force on the lower piston 28 and the upper piston 29. That In this way, the force system is between the workpiece adapter 30 and the clamp carrier body 31 (FIG. 5) locked in. The two coaxial and opposed pistons 28 and 29 preferably run longitudinally more correspondingly Ball cages 35 and 36.

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Claims (4)

19.980 / 1 40 / egg Pr.ra.WL IC-. 'L L3UH Company ALBE S.A., CH-6982 Agno / Switzerland Expectations: Device for an intermittent drive of a rotatable tool carrier table of a precision machine tool for machining workpieces, especially very small and very complex workpieces, such as ballpoint pen tips and electrical contacts, characterized by: a) four cam shafts (1, 2, 3, 4 in Figure 1), b) devices (16, 17, 18, 18 'in Figure 2; 33, 34 in Figure 6) for precise fixing or setting of the workpiece table (32) at the end of each movement step, the workpiece carrier table (32) being completely separated from its rotary drive for as long is how it is held by the fixing devices, i.e. during the processing of the Workpiece, and c) Lever devices (26, 27, 28, 29 in Figures 4 and 5) for controlling the workpiece holding tongs of the Table (32), the lever devices such 030035/0608 ORIGINAL INSPECTED are balanced so that no force is exerted on the table or, in the case of rotating pliers, acts on the bearings. 2. Apparatus according to claim 1, characterized in that the four cam disk shafts (1, 2, 3, 4 in Figure 1) can be driven by a single common motor with countershaft (5) via two toothed belts (g _# η) , each of which drives a worm (8 or 9) which engages in two worm gears (10, 11 or 12, 13) arranged at right angles to each other, each of which is firmly connected to a cam shaft, and that the motor countershaft (5) also the rotatable workpiece table (32) drives via a toothed belt (14 in Figures 2, 3) which transmits the drive to the center shaft of the table and sets a central worm (15), a worm wheel (16) and a cam disk (17) in motion. 3. Device according to claims 1 and 2, characterized in that that the devices for precise fixation (indexing) of the workpiece table with three rods (18, 18 ', etc.) are provided, which are driven by a lever mechanism, which in turn by a coaxial is driven to the cam disc (17) lying on the workpiece table (32) driving the cam disc (19), the rods (18, 18 ', etc.) in turn having a plunger (33 in Figure 6), which is arranged displaceably in the axial direction in a ball bearing cage (34) is. 4. Device according to claims 1, 2, 3, characterized in that that the balanced lever devices (Figures 4 and 5) a shoe bar (26 in Fig. 030035/0608 295201? gures 4 and 5), which acts on the middle part of a lever (27) which distributes the force between a piston (23) arranged under the workpiece table (32) and a piston (29) arranged above the table, which are coaxially opposite one another is arranged, and preferably running in ball bearing cages (35, 36), so that the system of forces between a workpiece 9 between ^{Zan e} (30) and a caliper support body (31 in Figure 5) incorporated. Device according to Claims 1 to 4, characterized in that that the feed movement of the turntable (32) from the cam disks by means of possibly cushioned Pistons (20 in Figure 4), tappets (21, 22) and lever mechanisms (24, 25) is transmitted. 030035/0608