DE2160291A1 - COMPONENT KIT FOR ASSEMBLING LATHE - Google Patents

Description

Component set for assembling lathes

The invention relates to a component set for assembling lathes, in particular single front lathes, Twin front lathes, multiple front lathes or Front lathe lines.

Such lathes are known per se. It is also known to use such machines with machine bases, compound slides, Headstocks, workpiece storage, feed, transfer, discharge, drive, hydraulic, electrical and chip removal devices equip. These very complex machines work largely fully automatically and are very expensive

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309825/002 /.

ORIGINAL INSPECTED

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in manufacture, maintenance and operation. Since many different types of such lathes are produced depending on requirements have to be, the production and storage becomes even more expensive. There is therefore a need to manufacture and to simplify storage of such machines in principle and still the diverse design to be able to adapt the individual machine types to the respective customer requirements.

This object is achieved according to the invention in that all machine units assigned to certain work processes, such as headstocks, loading devices, drive devices, Hydraulics, electrical unit> SpSnea discharge device and the like, as separate components that can be built into and removed from the lathe as a unit are designed, which means for fastening as well as mechanical and electrohydraulic connection both mutually and also designed as separate components Have machine feet and slide subtleties. Due to the basic idea of the modular construction, everyone no matter how complicated a lathe system is made up of several self-contained components, one of which is the individual machine can each have one or more copies, can be an enormous simplification and production of storage achieve. Any number of slide components, for example with simple or compound slide for clamping the tools and any number of headstocks with any orientation can be attached to these in just a few simple steps will. For each headstock it is then used as a separate one Components a workpiece feed and workpiece removal device applied. In addition, common workpiece storage components, Workpiece transfer components and drive components be set. The entire common hydraulic system is

309825/0024 - ³ -

summarized in a hydraulic component and the entire electrical system in an electrical component. Likewise, all numerical control devices can be integrated into a common numerical control component are summarized. Also for them Chip removal is grouped together as a closed component Facilities provided, which can be inserted between two headstocks and connected to the drive mechanisms, for example. are bindable. All components only have to be secured by suitable fasteners, such as hoods, pegs and Like., are easily detachably connected to each other, the hydraulic and electrical connection of the individual components via easily detachable plug or screw connections can be done =

Preferably, all components point to each other during assembly Plant coming straightening surfaces and stops, so that the installation can be carried out extremely quickly and safely kasiTi by simply adding the appropriate guide surfaces and stops placed next to each other and the components in the determined thereby Position to be attached.

In the case of a lathe assembled from the component set according to the invention, the difficulty of chip removal, which is already present in known lathes, occurs to an increased extent. However, in order not to komplisieren Φ, Ά simple assembly of the rotary machine of finished components by additional measures for removal of chips, according to a further proposal of the invention, the slide component overlapping, wherein displacement of a carriage to übereinandeinschiebende UTID transversely to the Erich Tung obliquely comprise by inclined bottom covers. These covers, mostly in the form of angled metal sheets, can slide telescopically one above the other when the slide is moved in one direction ί.id pull apart to a factor of three when moved in the opposite direction. In every position of the i-'f.nlittenn it is guaranteed that the spindle heads

30982B / 002A

BATH ORIGINAL

falling chips can only slide down in the direction prescribed by the covers. Preferably im installed state, the lower edge of the covers are each arranged over a discharge channel of the chip removal component. This channel can, for example, contain a conveyor belt or the like for removing the chips.

The hydraulic and the electrical component as well as the numerical one In a preferred embodiment, control components can be attached to both sides of the machine base component Cupboards trained.

In known lathes it is usually very cumbersome that workpiece transfer devices between the individual headstocks can only transfer a single workpiece. In an advantageous embodiment of the invention, the top component can therefore be attached to two headstock components and has two asymmetrical axes about a common axis pivotable loading arms each with two workpiece grippers arranged at a distance from the spindles between a workpiece feed component and a workpiece discharge component. The through the For example, trough-shaped workpiece feed components arriving workpieces are automatically picked up in pairs by the grippers grabbed the loading arms and pivoted into the machining position on the headstocks. They are then transferred to the drainage channels of the subsequent drainage component.

In an advantageous embodiment, the loading arms are seated on coaxial shafts, i.e. a solid shaft and a hollow shaft surrounding the same, each of which can be swiveled via a crank drive. The crank drive has the advantage that the loading arms start softly, then accelerate strongly and. slowly move into the end position at the end of the movement. This is particularly important with workpiece weights of up to 20 kg. In particular, a great saving of time can be achieved with the same precision.

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The transfer component can be removed very quickly and easily by replacing the grippers on the loading arms and at the same time Adjustment of the inlet and outlet channels can be converted to the processing of differently shaped workpieces.

Automatic loading is only possible through the asymmetrical arrangement of the parts assigned to the two loading arms • Unloading of two workpieces possible at the same time. Since the workpieces in the inlet and outlet channels can move by gravity, this design of the Handover component. Found the simplest possible solution.

With more complicated lathes it is often necessary to to turn the workpieces after a machining step so that they are fed to the headstocks in the opposite direction can be. According to a further proposal of the invention, a turning component is therefore created, which between the workpiece drainage channels assigned to a headstock component and the workpiece inlet channels assigned to a further headstock component can be installed and a receiving button for has two workpieces which can be raised, pivoted through 180 ° in the raised position and then lowered as far as possible, that the workpieces are level with the workpiece feed channels. Preferably, the two workpieces are supported Schinen bottoms of the receiving pocket during the lifting respectively held by a stop in the slope corresponding to the preceding drainage channel and fall in the uppermost position " in each case to a lower stop in the slope corresponding to the adjoining inlet channel. As a result, the workpieces slide on the preceding drainage channels on the 'inclined Bottoms of the receiving pocket and after turning over the bottoms of the receiving pocket, which are inclined in the opposite direction, to the adjoining inlet channels. This reversible component is therefore extremely simple and requires practically no maintenance.

309826/0024

The figures are used to illustrate the innovation explained in more detail. It shows

Figure 1 is an oblique view of a machine base component according to the invention,

FIG. 2 is an oblique view of two headstock components according to FIG the invention,

Figure 3 is an oblique view of a slide component according to b of the invention with a transverse bed and a cross slide,

FIG. H shows an oblique view of a slide component according to the invention with a transverse bed and two compound slides for a single-spindle machine,

FIG. 5 shows an oblique view of a slide component according to the invention with a transverse bed and two cross slides for Two-spindle machine,

FIG. 6 shows an oblique view of a slide component according to FIG Invention with a transverse bed and a · »cross slide as well • in «« turret head for two-spindle milling machine,

FIG. 7 is an oblique view of a right and a left upper slide component according to the invention,

FIG. 8 a diagrammatic view of a top transfer component placed on a headstock for one workpiece each,

FIG. 5, in an oblique view, shows an overhead component according to FIG

the invention for two workpieces at the same time,

»01126/0014

FIG. 10 shows an oblique view of part of an upper transfer component placed on two headstocks according to FIG the invention for two workpieces at the same time,

FIG. 11 shows an axial section through the upper transfer component shown in FIG. 10,

FIG. 12 shows a radial section along the line XII-XII in FIG. 11,

Figure 13 is an oblique view of a workpiece between and culauf channels. arranged reversible components according to the invention,

Figure 1 * shows a vertical section through the parts shown in Figure 13,

FIG. 15 is an oblique view of a cabinet designed as a cabinet Electrical component according to the invention,

FIG. 16 is an oblique view of one designed as a cabinet Hydraulic component according to the invention,

FIG. 17 is an oblique view of a single-spindle front lathe with two slide components according to the invention,

FIG. 18 is a partial oblique view of a two-spindle front lathe with a slide component according to the invention,

FIG. 19 shows a schematic axial section through a semi-automatic front lathe with a chip removal component according to the invention working to the rear,

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FIG. 20 shows a schematic axial section through a fully automatic one Front lathe with forward working chip removal part according to the invention,

FIG. 21 is an oblique view of a semi-automatic two-spindle front lathe with a slide component according to the invention,

FIG. 22 is a partial oblique view of a two-spindle front lathe with two slide components according to the invention,

FIG. 23 is an oblique view of a two-spindle front lathe with four slide components according to the invention,

FIG. 24 is an oblique view of a two-spindle front lathe with one - a tool slide and two turrets - ■.; heads having carriage component according to the invention and a numerical control component and

FIG. 25 is an oblique view of a fully automatic ten-spindle front lathe according to the invention.

In FIG. 1, a machine base component designed as a box base is shown 10 shown, to which the other components of the component set according to the invention can be attached, as shown in FIG FIGS. 17 to 25 can be seen »The investment flutes of the various components are designed so that this is precise Starting in exactly the right position does not cause any difficulties. The fasteners between, the individual Components are not shown in detail.

In Figure 1 are two headstock components placed next to each other, namely a right headstock 12 and a left one

309825/0024

- 9 headstock 14 shown with the chucks 16 and 18 respectively.

The slide component 2 3 shown in FIG. 3 has a transverse bed 20, a compound slide 22 and a tool mounting surface. The tool mounting surface can be adjusted by the cross slide by means of a hydraulic cylinder 26 acting in the longitudinal direction and by the transverse bed 20 by means of a hydraulic cylinder 28 acting in the transverse direction. In addition, the slide component has a plurality of oblique cover plates 30 which can be pushed one over the other for the discharge of SpSnea. The incident on the AbdeckfIc ¹ ee 30 Sp "ne slide down into a not shown SpSneabfuhrrinne. As a result, the problem of SpSneabfuhr dissolved in einfachster manner. Upon actuation of the hydraulic cylinder 28, the one above the other cross-cover plates are pulled apart on one side of the die clamping 24 30 and The opposite side is pushed together so that the parts underneath are always perfectly covered.

The slide component 23a shown in FIG. 4 essentially has most of the parts of the component shown in Figure 3 are duplicated, for example it has two compound slides 22a, 22b, two workpiece mounting surfaces 24a, 24b, two in the longitudinal direction acting hydraulic cylinders 26a, 26b and two hydraulic cylinders 28a, 28b working in the transverse direction. Between the right and left group of the component are again arranged on top of each other & sliding chip covers 30.

The component in FIG. 5 has essentially the same components shown slide component 2 3b, but the right and left group of this component are further apart and are each intended for a separate headstock. Of the In FIGS. 4 and 5, only the one transverse bed 20 is visible in each case.

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An arrangement similar to FIG. 5 is shown in FIG. 6, the right group being the same as the right group in FIG. 5, but the left group of the slide component Z3c having a turret 32 instead of a transverse bed and a transverse hydraulic cylinder. This embodiment of the slide component is also intended for two separate spindle blocks.

In Figure 7, two upper slide components are shown 23d each having a die clamping 3UA, 34b, vertical hydraulic cylinders 36a, 36b and horizontal hydraulic cylinders 38a, 38b w. For electro-hydraulic control of this Components are attached to the hydraulic and electrical components connected coasts 40a, 40b on these components.

An overhead component 42 is attached to the headstock component 14 with the chuck 18 shown in FIG has two coaxial shafts, not visible in FIG. 8, two symmetrical loading arms 44, 46, one at each end Workpiece gripper 48 or 50 is seated. The two shafts are longitudinally displaceable independently of one another, in order to form a gripper each grab a We * pieces 52 in an inlet channel 54 and after a pivoting movement of the loading arm 44 can be brought into the machining position in front of the chuck 18. Wake up termination During machining, the loading arm is then pivoted in such a way that the workpiece 52 is deposited into the drainage channel 56. Then the corresponding loading arm is shifted again in the axial direction, so that the gripper 48 or 50 from the workpiece 52 is resolved.

In Figure 9, a double upper transfer component 42a is shown schematically, which with two inlet channels 54a, 54b and two

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Drainage channels 56a, 56b and two schematically indicated tools clamped in chucks 16, 18 interact in such a way that that at the same time a pair of workpieces 52a, 52b presented to the two tools and then into the respective drain channel is passed.

How such an overhead component 42b works is shown in detail in FIGS. In this embodiment, the two inlet channels 54a, 51b and the two drainage channels 56a, 56b are arranged one above the other on one side. The two loading arms 44a, 44b are designed as asymmetrical three-pronged stars, one of which has prongs on a shaft 58 or on a shaft that surrounds it. Fasten hollow shaft 60! is. The other two prongs on this loading arm? are designed as grippers 48a, 48b or -SJDa _v .50b for the "workpieces 52a, 52b.

The axial drive of the shafts 58, 60 takes place in that the housing 62 containing the shafts as cuts in one Lower slide part 64 by actuating a hydraulic piston 66 is displaceable. The rotary drive of the shafts 58 and 60 takes place by means of toothed rack pistons 68 and 70, respectively, which via Gears 72 and 74 and shafts 76 and 78 fixedly connected to them can each drive a crank 80 and 82, respectively. At each crank has a bolt 84 or 86, which carries a sliding block 88 or 90, respectively. Every sliding block takes effect into the guideway 92 and 94, respectively, of a link lever 96 and 98, respectively. The two link levers 96 and 98 are with the hollow shaft -... 60 or the shaft 58 firmly connected.

When shifting the rack bolts 68 and 70 therefore the shafts 58 and 60 are pivoted through predetermined angles. These predetermined angles are the distance between the gripping position of those located in the Zulaufriftften * 4, a, 54b

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.309826 / 0024 - <

Workpieces 52a, 52b and the working position of the workpieces in front of those in the chucks 16 and 18 Weiteeugen or by the distance between this working position uid the delivery position of the workpieces in the Drainage channels 56a, 56b are determined. Due to the asymmetrical Training of the two loading arms 5Ha, 54b can be very In a simple way, two workpieces are taken up at the same time in the feed channels, processed by the tools and placed in the drainage channels. To this Purpose is first the housing 62 by actuating the Hydraulic cylinder 66 extended so that the loading arms

fc ter or according to FIG. 10 in front of the drain and inlet channels can grab. The free loading arm is then pivoted that the grippers 48a, 48b in the correct position at the end the inlet channels 54a, 5Ub held workpieces come. The housing 62 is then shifted in the opposite direction until the grippers are on the workpieces attack. Another displacement of the housing 62 and subsequent pivoting of the loading arm in question. brings the workpieces in front of the tools, where they are machined. The loading arm carrying the workpieces is then pivoted again and then the housing 62 is pivoted axially moved until the workpieces carried by this can be deposited in the drainage channels. Finally,

W another displacement of the housing 62 in the opposite direction has the effect of releasing the workpieces 52a, 52b, which then continue to flow into the drain due to gravity.

The pivoting movement of the loading arms takes place through the crank drive with the cranks 80, 82 and the link levers 96, 98 44a, 44b in such a way that the pivoting movement begins slowly at first, then accelerates sharply and slowly returns to the end position towards the end of the pivoting movement.

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309825/0024

The turning component 100 shown in FIGS. 13 and m is between the drainage channels 56a, 56b of a first upper transfer component 42b and the inlet channels 54a, 54b of a second Obergabe component 42 arranged. Br has a housing 102, in which a receiving pocket 104 by means of support shafts 106 is rotatably mounted. The receiving pocket 104 has one on top of the other two sloping booths 108, each with one Nose 110 rest on a stop 112. In the position of the sewing pocket 104 shown in FIG the workpieces 52a, 52b from the drainage channels 56a, 56b onto the Bottoms 108 of the receiving pocket 104 run in and are held in this position by stop strips 114. Afterward a rack piston 116 is actuated, which meshes with a gear 118 - on the upper support shaft Io6. Through this the receiving pocket 104 is pivoted about the axis of the support shafts 106 by 180 °. Sin on the housing .'102 seated guide pin 120 engages in a drum cam 122 on the upper Support shaft 106. Caused by rotation of the support shafts 106 the guide pin 120 therefore enters via the drum cam 122 Lifting the Aufnähmetasche 104 so that the bottoms 108 on the Reach the height of the inlet channels 54a, 54b of the subsequent upper transfer component. At the same time, the noses 110 of the Stops 112 released and the two fall on lower stops 121 on the receiving pocket, thereby getting their Surfaces fctwa the inclination of the inlet channels 54a, 54b and the workpieces 52a, 52b roll under the action of gravity into the inlet channels after they channel opposite the drain 56a, 56b are rotated by 180 °. When the receiving pocket 104 is rotated further, it is lowered again into the position shown in FIG. 14 and the lugs 110 come at the same time again on the stops 112 to rest, so that the next workpieces 52a, 52b from the drainage channels 56a, 56b into the Can roll up receiving pocket 104.

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FIG. 15 shows an embodiment of the cabinet-approved electrical component 126 that can be attached to a machine base component. shown. All electrical parts of the assembled lathe are housed in this component. He knows only a row of control buttons 128 on the outside.

So are all hydraulic parts and control devices combined in a similar cabinet-like hydraulic component 130.

In Figure 17, a single-spindle front turning machine is shown, which is composed of components according to the invention. It has a machine base component 10 _a, a slide component 23 a according to FIG. H, a headstock component IH according to FIG. 2, as well as an electrical component 126 and a hydraulic component 130. Below the chip cover 30, a chip removal channel 132 is provided, which belongs to a chip removal component 134 according to the invention, indicated schematically and explained in more detail below.

Instead of the left group of the carriage component 23a, the link «Group of the slide component shown in FIG. 6 23o can be installed without major changes, as indicated in FIG. In addition, the front part of the in The machine shown in FIG. 17 is surrounded by a protective housing 136 with an entrance door 138 shown at a distance from the machine. Assembling this machine from the components according to the invention is extremely simple and can be designed in any way according to the customer's wishes will.

The illustrated in Figure 18 in its essential parts Two-spindle front turning machine essentially has one

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309826/0024

Machine base component 10, two headstock components 12 and 14 and a slide component 23 according to FIG. This machine is for example for manufacturing suitable for two equal parts at the same time.

The composition of the individual components in the longitudinal direction can be seen from the section in FIG. In the Figure 19 shows the front lathe except in ■. .. Machine base component 10, only partially visible in this section, has a slide component 23, a headstock component 12 and a chip removal component 134 arranged below the slide and headstock component. The chip removal component 13 <t has a conveyor belt 137, which falls over a funnel-shaped inlet 139 down Removes chips to the rear and top. The electrical component 126 can be seen behind the headstock component 12 in FIG. 19. This machine works semi-automatically.

In the case of the front lathe shown in section in FIG. 20, which works fully automatically, is additionally In addition to the parts shown in FIG. 19, there is also an overhead component 42b according to FIGS. 10 to 12 is provided. In addition, there is a chip removal component 134 in this embodiment provided, which is not as in the embodiment according to Figure 19 to the rear, but in the transverse direction, that is perpendicular promotes to the drawing plane.

FIG. 21 shows an embodiment of a two-spindle front lathe with a somewhat simplified compared to FIG Slide component 23 according to FIG. 3. Otherwise correspond the components of this embodiment correspond to those of the embodiment shown in FIG.

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3 0 9 8 2 B / 0 0 2 4

A modified embodiment of the machine shown in FIG is shown in FIG. It is a two-spindle front lathe with a slide component 23b according to FIG. 5. The other components correspond to in Figure * 8 embodiment shown.

An embodiment provided with a slide component 23b and two upper slide components 23d according to FIG. 7 is shown in FIG. The other components of this embodiment correspond to the embodiments shown in the preceding figures.

in Figure 24 is a two-spindle front lathe with predominantly Components already shown and explained in previous figures. The only difference here is the slide component 23e from the other embodiments, since it has two turret heads 32 on a tool slide 22. In addition, this embodiment shows a further, cabinet-shaped, attached to the outside of the hydraulic component 130 numerical control component IfO, which contains all numerical Includes control devices of the machine shown. The advantage of this combination of the numerical control devices in the cabinet-shaped component IHO consists fc in that only a single control unit is required, while normally there must be two separate control units for the two-spindle lathe. It deals are therefore actually two machines that make one essential through skillful use of the component set according to the invention may have a lower manufacturing price. This is shown in Figure 2 * 1 The illustrated embodiment of a numerically controlled or so-called N / C front lathe achieves one extraordinarily high degree of utilization, namely almost IOC% -. There is always the Spindle of a headstock, for example the spindle el stock 12, is still, while a new tool for machining in the chuck of the same is clamped. During this

309825/002 /,

17th

The spindle of the other headstock works during one clamping time 14 with the one turret 32 together. As soon as this workpiece is finished on the spindle of the spindle head 1 ** is, the tool slide 22 automatically moves to the left as a result of the numerical control by the component 140 to the ■ ··> ·. Headstock 12 and the processing will start immediately of the workpiece, which has been clamped in the meantime, is started by the tools fastened in the second »left turret head. This second workpiece can have a completely different design from that which was machined on the headstock 14 immediately before Workpiece. For this case, a punched tape reader or the like is present in the numerical control component 110, for example and both programs for the headstocks 12 and 14 are consecutively on a punched tape or other Tax funds available. Of course, two punched tape readers can also be used for entering information from two different ones Programs. To operate this relatively complicated machine, therefore, only a single unskilled force is required to clamp and unclamp the workpieces and may be required for changing the punched tape or the like.

In FIG. 25, a fully automatic ten-spindle front turning machine line according to the invention is shown schematically. It essentially has two machine base components 10, five slide components 23 before. one of which cannot be seen behind the protective housing 136, five headstock components 12, five headstock components 14, of which just- * if one is covered by the protective housing 136, seven workpiece supply or discharge components 54 and 56, which partially collapse into one component, five transfer components 42b, a turning component 100 and two chip removal components 134, one of which also passes through the protective housing is covered. It can be seen that this, too, "complicated things."

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309826/0024

Front lathe line from the component set according to the invention can be put together extremely quickly and easily. There is an electrical component at the back of the street 126 and a hydraulic component 130 attached. On the front there are also control panels 112 for the supervision of the machine.

309826/0034

Claims (1)

- 19 claims Jl.j component set for assembling lathes, thereby ^ ■ ^ indicates that all specific operations are assigned Machine units as separate, uniform components that can be installed in and removed from the lathe (12, IU, 42, 100, 126, 130, 134, IHO) are formed, which Fixing devices as well as mechanical and electro-hydraulic Connection both to each other and to machine feet, which are also designed as separate components (10) and slide units (23). 2. Set of components according to claim 1, characterized in that it has at least one machine foot (10), slide (23), Headstock (12), workpiece storage, feed (54), transfer (42), Removal (56), turning (100), drive, hydraulic (130) ^ numerical control (140), electrical (126) and chip removal structures (134) includes. 3. Component set according to claim 2 or 3, characterized in that the individual components to single front lathes, Twin freezing machines, multiple front lathes or front lathe lines can be combined as required and mechanically and electro-hydraulically connected to one another, are. 4. Component set according to one of the preceding claims, characterized in that all components during assembly for mutual Attachment to show coming Ric.htmlSchen and notices. 5. Set of components according to one of the preceding claims, characterized in that the slide component (23, 23a, 23b, 23c, 23d) overlapping, when a carriage (22, 22a, 22b) is displaced, sliding one above the other and transversely to the - 20, - 309826/0024 Direction of displacement obliquely downward sloping covers (30). 6. Set of components according to claim 5, characterized in that in the installed state the lower edge of the covers (30) each above a discharge channel (132) of the SpSnea discharge component (134) is arranged. 7. Component set according to one of the preceding claims »characterized in that the hydraulic component (130), the electrical component (126) and the numerical control> ^component (IUO) are each designed as attachable cabinets on both sides of the machine base component. 8. Set of elements according to any one of the preceding claims, characterized in that the upper transfer member (H2b) on two spin · trade tock components (12, IH) attachable and two asymmetrical ₉ about a common axis "pivotable Lsdearme (* I4A, HHb) each with two workpiece grippers (48a, H8b; 50a, 50b) arranged at a distance from the spindles between a workpiece inlet component (5Ha, 5Hb) and a workpiece outlet component (56a, 56b). 9c component set according to claim 8 _S, characterized in that the loading arms (5Ha, 5Ub) sit on coaxial shafts (58, 60) which can be pivoted via a jejpine crank drive (80, 96; 82, 98). 0. component set according to claim 9, characterized in that the Loading arms (öHa, 5Hb) with their drive devices in one Housing (62) are mounted, which in a slide guide part (6H) by means of a hydraulic cylinder (66) in the axial direction the pivoting movement of the loading arms is displaceable. O 's 309825/0024 BAD ORIG | _NAL 11. The set of parts NaCN one of the preceding claims, characterized in that the turning member (100) associated between a Spindebtock component (12, I ¹ O workpiece gutters (56a, 56b) and a further Spi <ndelstock ~ component (12 , IH) associated workpiece inlet channels (54a, 5Ub) can be installed and has a receiving pocket (104) for two workpieces (52a, 52b), which can be raised, pivoted through 180 ° in the raised position and then locked in such a way that the * Workpieces are at the height of the workpiece inlet channels. 12. Set of components according to claim 11, characterized in that the sloping floors carrying the two workpieces (52a, 52b) (108) of the receiving pocket (104) during the lifting in each case from a stop (112) in which the drainage channels (56a, 56b) corresponding slope are held and in the uppermost position each to a lower stop (124) in the slope corresponding to the inlet channels (54a, 54b). Bu / an 309825/0024