DE2103120C2 - Device for the automatic loading and unloading of ring-shaped workpieces on an internal grinding machine - Google Patents

Description

The invention relates to a device for the automatic loading and unloading of ring-shaped, isolated Workpieces on an internal grinding maximum, in which the workpiece inevitably and automatically in a predetermined Cycle brought to processing points and after processing and cancellation of the workpiece clamping is discharged.

A loading device is known, which removes the isolated ring-shaped workpieces, for example roller bearing rings, removed from a feed chute by means of a swivel lever encompassing the workpiece and inserted into Brings processing position. With the same swivel lever, the Return of the workpiece on the feed track.

This device has the disadvantage that when switching to other workpiece sizes, which are both the diameter as well as the width can change, the adjustment range of the device without replacement is limited by function-related feed parts. In addition, it is noticeable disadvantageously that the times for the construction-related individual movements of the workpiece within the loading device, which result from the acceptance of the separated and delivery of the processed workpiece as well the inward and outward swiveling movement of the swivel lever, add them up and thus the switching duration is negative influence.

Furthermore, a device for loading ring-shaped workpieces on internal grinding machines is known, in which the separated workpiece is driven step by step in the same direction of rotation Transport disk is detected and fed to the processing point. This transport disc has from this Basically several recesses corresponding to the workpiece dimensions in the same division on their circumference so that the takeover at the same time as a workpiece is fed into the machining position of a new workpiece from a pre-loading position as well as the removal of the machined workpiece the processing position can inevitably take place.

ίο With the help of this facility, the in supply and discharge taking place in the same direction relatively short loading times can be achieved, but it has the disadvantage that a changeover to workpieces with other dimensions requires a particularly high amount of interchangeable parts through the necessary replacement of the transport disk and the radial workpiece guides Another disadvantage of this device is that due to the constant division of the Transport disk, the diameter of which is dependent on the largest possible workpiece diameter Switching travel when loading workpieces with smaller diameters does not depend on the specific conditions are adjustable, which has a negative effect on the duration of the switching times. The loaders described above facility is therefore only for workpieces in a limited Diameter range can be used economically. When using this device on internal cylindrical grinding machines In addition, it is disadvantageously noticeable that the transport disk In addition to the successive rotary movement, a translatory movement must be carried out, which results in the constructive Effort further increased.

According to US-PS 29 12 798 another loading device for machine tools is known in which with the workpieces are fed from a preloading position to the processing station and with a loading arm Unloading arm can be removed from the processing station.

This loading device has the disadvantage that each of the workpiece receptacles for different workpieces of the loading and unloading arms must be changed, and also to accommodate the workpieces the loading arm requires a separate centering device for the workpiece.

At the same time, the long pivoting path of the loading arm requires a relatively long time for the loading process. In this loading device, it is also necessary that the loading and unloading arms perform axial movements, to accommodate the workpieces, which results in a complex design of the loading device. Of the Use of this loading device on internal cylindrical grinding machines also requires that the unloading arm for The workpiece is only picked up after completion of the work process and after the internal grinding spindle has been extended pivots out of the workpiece into the unloading position, which in turn increases the time for the charging process occurs.

The purpose of the invention is to eliminate the deficiencies inherent in the prior art in order to reduce the by the Charging device-related non-productive times as well as the design effort, taking into account the device size to a necessary minimum.

The invention is based on the object of providing a device for the automatic loading and unloading of ring-shaped, isolated workpieces on an internal grinding machine with an unmachined workpiece from one, the workpieces by gravity to-

leading magazine to a workpiece holder provided with support shoes converting pivotable Loading arm and with a swiveling unloading arm which is geared to the loading arm and which processes the Workpieces are transferred to a discharge rail to create an inevitable supply and removal of ring-shaped workpieces of various dimensions into and / or out of the machining position with the shortest loading paths and thus the shortest switching times, adjustable to the workpiece size made possible, with the conversion effort, including interchangeable parts, to a minimum is

According to the invention the object is achieved in that between a vertical base plate and a front plate parallel to this, both the loading arm provided with inclined guide strips and its mouth end is limited by a stationary guide rail lying transversely to the guide rails than also arranged with the opposite, laterally arranged cam provided discharge arm in parallel planes are, the unloading arm in its pivot dead center with the loading arm in its lower Pivot dead center form a workpiece holder from which the unprocessed workpiece can be pivoted back of the unloading arm is placed on the support shoes. According to a further feature of the invention the guide rails of the loading arm and the guide rail can be adjusted to the workpiece diameter.

The solution according to the invention has the advantage that with simultaneous supply and removal of the workpieces the workpiece paths depending on the workpiece dimensions that differ in a wide range can be adjusted to optimal values. This makes the necessary non-productive times crucial reduced.

Another advantage of the device according to the invention is its universal use within the grinding machine-dependent processing area as well as in the adjustability of the device if necessary Retrofitting, which, in contrast to known facilities, does not require any work-piece-dependent interchangeable parts can be done. The prerequisites have thus been created, the profitability of highly productive increase chuckless internal grinding machines.

The invention will be explained in more detail below using an exemplary embodiment. In the drawings shows

F i g. 1 shows a schematic diagram of the automatic loading and unloading device according to the invention,

Fig. 2 is a schematic representation of the drive for loading and unloading arms,

F i g. 3 loading and unloading arms in processing position,

F i g. 4 loading and unloading arms in ejection position,

F i g. 5 loading and unloading arms in transfer position,

F i g. 6 Unloading arm in processing and loading arm in workpiece transfer position.

In the case of an internal grinding machine with the processed workpiece 13 held in support shoes 9, 10, the loading and unloading device consists of a loading arm 1 and an unloading arm 4, which are positioned between a vertical base plate 12 and a parallel front plate 11 in parallel planes around the pivot points 33, 27 sway. To pick up a workpiece 13 from the feed tray 14 and to guide the unprocessed workpiece 13 into the Vo ^r loading position on the loading arm 1 parallel to each other adjustable, inclined guide bars 2,3 are provided '", which in cooperation with a guide rail 7 extending transversely of The preloading position is arranged so as to be adjustable on the base plate 12 according to the guide strips 2, 3

ίο provided. For the removal of the ejected workpiece 13 is between the front plate 11 and the base plate 12 an inclined discharge rail 8 is attached. Loading arm 1 and unloading arm 4 are in their pivoting movements inevitably connected in such a way that they are controlled by a cam gear 15-20, which is operated by a separate drive is derived, are driven. The coupling gear part connected to the loading arm 1 is made up of a rocker arm 28 pivotable about a fixed pivot point 29, a coupling 31 and one around the pivot point 33 movable pivot lever 32 is formed. The pivot movement of the pivot lever 32 corresponds to the movement of the loading arm 1, the loading arm movement by moving one with the coupling 31 articulated articulation point 30 on the rocker arm 28 depending on the workpiece diameter is adjustable. The coupling gear part connected to the unloading arm 4 is made of one about a fixed pivot point 23 pivotable rocker arm 22, a coupling 25 and one around the Pivot 27 movable pivot lever 26 is formed. The pivoting movement of the pivot lever 26 corresponds the movement of the unloading arm 4, the unloading arm movement analogous to the prescribed Gear part by moving a pivot point 24 articulated to the coupling 25 on the Rocker arm 22 is adjustable.

As shown in FIG. 3, the loading arm 1 has taken over a workpiece 13 'separated by not shown but generally known means from the feed chute 14 and guided it into the preloading position. This position is determined by the upper detent of the loading arm 1 derived from the cam 21 and by the position of the guide rail 7.
After the grinding process has been completed, the machined workpiece 13 is lifted out of the support shoes 9, 10 by the unloading arm 4 by the amount "a" (FIG. 4). This is followed by the pivoting of the loading arm 1 by the amount iwan, whereby the machined workpiece 13 moves from the inclined guide bar 3 via the discharge rail

so 8 is ejected. At the same time, the unprocessed workpiece 13 'to be loaded is transferred from the Loading arm 1 to unloading arm 4.

As FIG. 5 shows, in this transfer position the workpiece 13 'is radially attached to the unloading arm 4.

si continuous cams 5, 6 and the guide strips 2, 3 includes. As a result of the subsequent pivoting back of the unloading arm 4, the workpiece 13 'is fed to the machining positions determined by the support shoes 9, 10 (FIG. 6). In the course of the subsequent return movement of the loading arm 1 into the upper detent, another workpiece 13 'arrives in the preloading position within the processing phase of the workpiece 13'. In this position, the loading means remains so lat, _t; e until the machining of the workpiece 13 off '

b5 is closed.

After completion of the processing process, the loading cycle is indicated by a corresponding signal in the Kind of initiated that the cam plate 21 by an

rotation is advanced. The cam 21 is designed so that the necessary movements of Loading arm 1 and unloading arm 4 can inevitably run in a timed sequence.

To convert the workpieces with other dimensions, the guide strips 2, 3, the guide rail 7, the front plate 11 and the cams 5, 6 of the unloading arm 4 can be adjusted within the loading and unloading device described. Optimal loading times can be achieved by adapting the amounts “a” and “b” corresponding to the pivoting movements to the respective workpiece diameter by shifting the articulation points 24, 30 on the rocking levers 22, 28.

For this purpose 2 sheets of drawings

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Claims (2)

Patent claims: 1. Device for automatic loading and unloading of ring-shaped, separated workpieces on one Internal grinding machine with an unmachined workpiece from one of the workpieces Transfer the gravity feeding magazine to a workpiece holder provided with support shoes pivotable loading arm and with a pivotable one coupled to the loading arm in a geared manner Unloading arm, which transfers the machined workpieces to a discharge rail, thereby characterized that between a vertical Base plate (12) and a front plate (11) parallel to it, both with the inclined guide strips (2, 3) provided loading arm (1), whose mouth end through a transverse to the guide rails (2, 3) lying stationary guide rail (7) is limited, as well as the one with opposite, laterally arranged cams (5,6) provided discharge arms (4) are arranged in parallel planes, wherein the unloading arm (4) in its upper pivot dead center with the loading arm (1) in its lower one Pivot dead center form a workpiece holder from which the unmachined workpiece (13 ') passes The unloading arm (4) is pivoted back onto the support shoes (9, 10). 2. Device according to claim 1, characterized in that the guide strips (2, 3) of the loading arm (1) and the guide rail (7) are adjustable to the workpiece diameter.