DE2336012A1 - Multi-contact rotary switchgear - has switching shaft with contact actuating, rotary cams, mounted releasably in bearing blocks - Google Patents

Abstract

The shaft is axially adjustable in the bearing blocks, at least one of which can be driven and coupled to the shaft in a preset position. One coupling half aligned with the switching shaft is relatively slidable with respect to its support element against the effect of a force accumulator. The switching shaft may have a conical formation on each of its front faces, which engage positively the corresponding conical recesses in the bearing blocks. The axially adjustable coupling half may be formed by a sprung pin, eccentrically mounted in one bearing block, to which is associated a locking recess in the face of the corresponding switching shaft cone.

Description

DR.-ΙΝβ. OIPL.-ΙΝβ. M. SC. Ο · * «.. · *. IY *. OR. DIP '. -PHV *. HÖGER - LEGAL RIGHTS - GRIESSBACH - HAECKER PATENT LAWYERS IN STUTTGART

2336Q12

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July 6, 1973

Mr. Eduard Hermle
73o3 Neuhausen, Kirchstr. 2o

Rear derailleur

The invention relates to a switching mechanism with a switching shaft the for actuation of switches arranged along the switching shaft several rotatable about this and assigned to the switches Carries cam disks, and the removable ends between two mounted in bearings of the switch housing Bearing stubs added and at least one bearing stub is axially adjustable for insertion or for removal against the action of a storage force, with at least one the bearing stub can be driven and the selector shaft and at least the drivable bearing stub on their adjacent end faces in a predetermined position in relation to one another so that they cannot rotate are connectable.

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Switching mechanisms are used to control the work cycle of presses, assembly or packaging machines, etc., whereby By setting your cam disks accordingly, you can define a switching program that is used to control in a certain time sequence to be carried out work operations for the processing or completion of certain Items is required.

If machines equipped with such a switchgear are to be converted, the setting must also be changed of the switching mechanism, including either readjusting at least some of the cam disks or cam disks that were not used for the previous program, now are to be adjusted.

In order to be able to do this adjustment work each time a workpiece series is changed To save on the switching mechanism, switching mechanisms have been developed in which the switching shaft carrying the cam disk is located can be exchanged for another. In one of these known constructions, the shift shaft is from the drive and, if necessary, from a further selector shaft of a downstream switchgear and from the bearing shells of the housing to solve, which is therefore cumbersome and time-consuming because, in particular for drive reasons, the shaft ends are provided with corresponding grooves and wedges, which are designed to fit precisely and are therefore difficult to put together.

Another known embodiment of this type relates to a switching mechanism of the generic type. With this construction

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tion can involve removing the selector shaft from the housing bearings inasmuch as it can be clamped between two stubs mounted in the housing bearings. In this case When installing the selector shaft, it is only necessary to ensure that the selector shaft to be installed is in a predetermined position, ment is used in the switchgear in order to be programmed with regard to the cam disk position when the machine starts up to be in agreement with the machining operations to be initiated.

For this purpose one of the bearing stubs is used for the drive serves the selector shaft, equipped with an inner flange, which extends radially inward from its circumference has a relatively short groove. This groove a pin protruding from one end of the shaft is assigned to the selector shaft, which when installed in the Groove engages and thus a predetermined angular position of the selector shaft to the with the drive and possibly with the Output coupled and therefore non-rotatable bearing stubs specifies. However, this type of switching shaft fixation has the disadvantage that due to the limited space within of the derailleur housing when installing a selector shaft, attention must be paid to the exact position of the mentioned groove on the driven bearing stub in order to avoid the corresponding end of the selector shaft to bring the existing pin into engagement with this straight away.

The installation of the switch shaft is therefore particularly cumbersome, if the Lagersturamel in question is in such a

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Position remains so that the groove is near the bottom of the housing and it is not always possible to manually control the machine in question and thus the bearing stub in a favorable installation position to clock.

The invention is therefore based on the object of switching mechanisms of the type described last to develop constructively so that the required angular position is achieved when installing the selector shaft the same results to the drive stub without paying special attention to it.

In such switching mechanisms, this object is achieved in that one of the coupling halves is in the axial direction of the switching shaft relative to which the same supporting rope can be displaced against the action of an energy storage device. With this construction is when installing the selector shaft according to the invention in the axial direction or axially parallel to the relevant Drive stub adjustable coupling half inevitably axially displaced so far that between the bearing stubs there is enough space to insert the selector shaft. If the selector shaft is roughly in alignment with the Bearing stubs, the two coupling halves can then be removed bring them into engagement with one another in a simple manner by manually turning the selector shaft until it reaches the angular position has reached, in which the counter, the effect of the energy store axially adjusted coupling half can move automatically into its coupling position.

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With the invention, the changeover times of such Significantly reduce rear derailleurs and simplify retrofitting. According to the invention, the coupling half which is adjustable relative to the driven bearing stub or to the shift shaft can be arranged here both on the bearing stub and on the selector shaft itself. They can also be constructive in their Any training, provided that it is not just a non-rotatable connection of the driven bearing stub with the Shift shaft but also ensures that the non-rotatable connection of these parts only in a very specific relative Position to each other is given. ,

The assembly of the selector shaft is particularly easy when it is in an aligned position has been brought with the bearing stumps, in not yet coupled State between the bearing stubs themselves. This can be done in a simple manner by that the selector shaft for receiving between the bearing stubs, each with a cone formed on the end face, in corresponding conical recesses of the bearing stub engages positively. The fact that when inserting the selector shaft they come together is axially adjustable with a bearing stub against the action of a storage force to the distance between de bearing stubs to enlarge, it is also ensured that then, when it is in its installation position, the storage force generates such a pressure that is sufficient, the cones of the control shaft in the corresponding recesses to hold the bearing stub. This construction also has the advantage that the cones are also used for frictional drive

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connection of the bearing parts with the shift shaft contribute can. This possibility is of particular importance when the axially adjustable coupling half according to a preferred embodiment of the invention only by an axially adjustable in the conical recess of the

a bearing stub eccentrically arranged, spring-loaded Pin is formed, which is assigned a locking recess as a further coupling half in the end face of the corresponding shift shaft cone.

In order to create an effective non-positive connection between the selector shaft and the two bearing stubs, It is also advantageous if a bearing stub is used in a known manner to accommodate the selector shaft its end face one of the conical recesses having a receiving member non-rotatable, but against the action of a Energy accumulator is arranged axially displaceable, which is used for the frictional connection of the shift shaft with the bearing stubs can be applied by means of an actuator under pressure to the corresponding end face of the selector shaft. In this way the selector shaft can be clamped between the bearing stubs. An advantageous construction is available here, when the actuator is attached to the rear end face of a flange of the receiving member which is in the conical recess can be applied and by a ring nut arranged on a threaded shaft of the bearing stub carrying the receiving element is formed. Here, the flange can be manually adjusted for axial adjustment of the receiving member for inserting the switching

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shaft between the bearing stub are used, which is why one expediently the diameter of the flange essentially the diameter of the one arranged on the selector shaft Will adjust the cam.

When it comes to the use of switching mechanisms, it is not infrequently the case that up to forty or more switches are required to control all machine functions. In order not to have to make such switching mechanisms too difficult, switching mechanisms with a different number of switches are usually produced, with a maximum of twenty switches being common. This means that if forty or more switches are ^{required to create 1} a control program, two or more switchgear must be coupled one behind the other. For this purpose, derailleurs are required in which both bearing stubs protrude from the derailleur housing, which is why Schaltweike is usually carried out in this way and the bearing stub on the output side, if it is not required, is covered by a cover. In this case, however, the prerequisite must also be created that when two or more switching mechanisms are connected in series, the bearing stub on the output side always assumes the position relative to the newly inserted switching shaft that it previously occupied to the other switching shaft when changing the switching shaft ensure that the drive of the downstream or possibly downstream switchgear is in accordance with the program. For this reason, the bearing stub on the output side is also advantageous

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to form a form-fitting coupling with the shift shaft and a coupling half on its carrier part against the action an energy storage device can be arranged so that it can be moved so that the clutch only comes into engagement when through Rotate the selector shaft this and the bearing stub assume a certain relative angular position to each other.

In the case of switching mechanisms, their switches, which are arranged along the switching shaft, are on a common, close to the cam disk arranged and these .possibly partially overlapping girder bridge are arranged, there is the additional Try to learn that due to the standardized housing dimensions, the free space above the control shaft between the Switching shaft adjacent housing wall and the support bridge is so narrow that there is no longer any possibility of grasping the To intervene switching shaft between this and the carrier bridge, the invention enables such switchgear constructions an advantageous replacement of the switching shaft when the carrier bridge is detachable from its holder and from the cam disks is movable away. In a preferred embodiment In this case, the carrier bridge can be pivoted about a pivot axis arranged parallel to the shift shaft axis and is in its position of use lockable. Advantageously, with such a construction, the locking device will be designed in such a way that that the girder bridge can be unlocked and swiveled away manually, i.e. without having to use tools.

Further features and details of the invention will become apparent from the following description with reference to the drawing, which

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a possible embodiment of an inventive Represents the rear derailleur. In the drawing show:

Fig.l shows a longitudinal section of a switching mechanism in Abbreviated representation, the switching shaft removable between two each from the Housing protruding bearing stubs is arranged,

2 shows a cross section through the switching mechanism,

3 shows a partial longitudinal section through the switching mechanism along the line 3-3 of FIG.

The switching mechanism shown in the drawing has a housing 12 closed by a removable cover Io. With 14 a shift shaft is designated as a whole, which is held between two bearing stubs 2o, 22 mounted in the housing in ball bearings 16 and 18, respectively. A plurality of pairs of cam disks 24 is arranged on the switching shaft in a known manner, the cam disks 26, 28 of which can be rotated relative to one another after loosening an annular nut 3o. Each pair of cam disks sits on a flange sleeve 32 which, together with the cam disks 26, 28 of an intermediate disk 29 and the ring nut 3o, forms a cam disk package in a known manner. As FIG. 2 shows, the switching shaft 14 is arranged eccentrically in the housing in such a way that its cam disk packs are located at a relatively small distance from the one housing side wall 34 _f

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so that the opposite housing side wall 36 is a relatively large distance from the cam disk pairs Has. A Gräger bridge, which extends along the selector shaft and is designated by 38, is installed in this space. This carrier bridge carries an electrical switch 4o for each pair of cam disks. These are each via an in the support bridge against the action of a compression spring 41 axially displaceably mounted SC holding ram 42 can be actuated. The shift tappets carry at their free end a roller 44 with which they roll on the circumference of the pair of cam disks to be scanned. A switching program for machines can be created by setting the cam disks of each pair of cam disks accordingly specify work operations to be carried out in a specific time sequence. The girder bridge 38 is on two Pivot pins 46, 47, which are coaxial to one another and axially parallel to the switching shaft, are held pivotable, which in turn are used in two mounting brackets 48.5o fixed to the housing. This pivotable arrangement of the girder bridge is therefore necessary because the carrier bridge assumes such a position in its normal position that it slightly touches the pairs of cams overlaps at an angle, so that the fingers cannot get between the carrier bridge and the cam disk pairs without severe hindrance 24 gripped and the switching shaft can be removed from the space between the housing wall 34 and the carrier bridge 38.

In its normal position according to FIG. 2, the girder bridge is on the brackets locked 48.5o, for which purpose they are attached to the selector shaft facing flat side downwardly protruding stops 52,54, which in the area of their lower end with one

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AA

Recess 56 are equipped. Each of these stops is a swivel bolt mounted pivotably on the support brackets 48,5ο 58 or 6o assigned, which in the normal position of the girder bridge with its locking lug 62, one through the recess 56 reach behind the defined edge 64 of the stops 52. A compression spring 66 tries to hold the swivel bolts in their locking position according to FIG. At her from the End piece facing away from the locking lug, the two swivel bolts are connected to one another by a common connecting piece 68 tied together. To unlock the girder bridge is on this connector exert a pressure so that the latches are pivoted together into their unlocked position and the stops 52,54 or the girder bridge are released.

As can be seen from FIG. 1, both bearing stubs 2o, 22 protrude out of the housing and bearing stub 22 is covered by a removable cover 7o. While the camp stub 2o forms a drive pin, the bearing stub 22 can be used as an output pin can be used in the event that at least one additional switchgear is to be coupled to the switchgear. Axially inside the bearing stub 22 is a receiving member 74 having an outer flange 72 against the action of a compression spring 76 non-rotatable, but arranged to be axially displaceable. The rotation lock is achieved by means of a feather key 78 which engages in a corresponding groove. The outer end position of the receiving member is limited by a stop screw 8o screwed radially into the bearing stub, on which the Feather key 78 comes to rest. On the outer circumference of the inner end piece, the bearing stub has an external thread onto which one

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Al

Ring nut 82 is screwed on.

A conically tapering shoulder 84 or 86 is formed on both ends of the selector shaft, and those on the adjacent one The end face of the bearing stub 2o or on the front end face of the flange 72 of the receiving member 74 is a conical one Recess 87 or 88 is assigned. The conical lugs 84, 86 also serve as a force-fit connection the selector shaft with the bearing stubs 2o, 22 by being inserted in State of the shift shaft the ring nut 82 is placed on the rear face of the flange 72 and thereby the Circumferential surfaces of the approaches 84.86 of the selector shaft under pressure with the corresponding circumferential surfaces of the recesses 87, 88 be kept in touch.

When replacing a control shaft with another control shaft, the pairs of cam disks correspond to another Switching program are set, it is important that the switching shafts always have the same relative value in the inserted state Position to the bearing stubs 2o, 22 to always take the to have the same starting situation with regard to the switching sequence. According to the invention, this is now achieved in that Couplings are interposed between the bearing stubs and the selector shaft to ensure that, if the ring nut 82 is not tightened, only a non-rotatable connection between these parts in a predetermined position comes about. In the present exemplary embodiment, these clutches are each provided with an axially parallel to the bearing

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mute in displaceable and resting on a compression spring 89,91, and pin 9o or 92 arranged eccentrically in the bearing stub 2o or in the receiving member 74, the outer position of which is fixed by a stop screw 94 or. This pin is on the front sides of the conical Approaches 84, 86 of the S .haltwelle each assigned a bore or 98, in which they engage positively.

To replace a control shaft, remove the housing cover Io to loosen the ring nut 82 from the housing 12, so that the flange 72 of the Aufpahmegliedes 74 captured and According to Fig.r can be adjusted axially to the right, whereby the pin 92 of the receiving member 74 from the corresponding Bore 98 of the selector shaft is pulled out and the projection 86 is released from the receiving member. The receiving member can be adjusted axially by such an amount that then after the girder bridge has been pivoted can be easily removed and exchanged for another. When inserting the new selector shaft is it does not matter which position the bores 96,98 of the selector shaft extensions 84,86 to the corresponding pins 9o, 92 to have. This is because the lugs 84, 86 engage in the corresponding conical recesses 88 of the bearing stub 2o and of the receiving member 74 a, the pins 9o, 92 are pushed back against the action of the corresponding compression spring. It holds up the selector shaft automatically between the bearing stub 2o and receiving member 22 by the compression spring 76 the latter. in the direction the shift shaft pushes, whereby their approaches 84.86

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are automatically held in the corresponding recesses, then the selector shaft can then be rotated manually for as long are until the pins 9o, 92 automatically in the corresponding Engage eccentric hole 96 or 98. The ring nut 82 is then to be tightened so that a non-positive Connection between bearing stub 2o and receiving member 74 comes about, after which the girder bridge is finally pivoted into its position shown in FIG. 2 and locked is. This means that the switchgear is ready for use again after the housing is closed.

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Claims (10)

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6.7.73 Patent claims: Switching mechanism with a switching shaft, which is used to operate switches arranged along the switching shaft this carries rotatable cam disks associated with the switches and the ends of which can be removed between two added bearing stubs stored in bearings of the derailleur housing and at least on one bearing stub for insertion or is axially adjustable for removal against the action of a storage force, with at least one the bearing stub can be driven and the selector shaft and at least the drivable bearing stub on their adjacent ones End faces can be coupled to one another in a rotationally secure manner in a predetermined position, characterized in that that the one of the coupling halves (9o, 96; 92, 98) in the axial direction of the shift shaft (14) relative to the same supporting part can be displaced against the action of an energy store (89 or 91). 2. Switching mechanism according to claim 1, characterized in that the switching shaft (14) for receiving between the bearing stubs (2o, 22) each with a frontally molded cone (84 _f 86) in corresponding conical recesses (87, 88) of the bearing stub (2o , 22) engages positively. - 16 - 409885/0275 A 4o o92 b
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6.7.73 3. Switching mechanism according to claim 1 or 2, characterized in that that the axially adjustable coupling half (9o, 92) through one in the conical recess (87) of the one bearing stub (2o) eccentrically arranged, spring-loaded pin is formed, the one in the face of the corresponding Shift shaft cone (87) is assigned a latching recess (96). 4. Switching mechanism according to claim 2 or 3, characterized in that that for inserting or removing the selector shaft (14) in a bearing stub (22) in a known manner for receiving the control shaft serving and having one of the conical recesses (88) on its end face (74) non-rotatable, but arranged to be axially displaceable against the action of an energy store (76) is, that for the frictional connection of the shift shaft (14) with the bearing stubs (2o, 22) by means of an actuator (82) under pressure at the corresponding end face the shift shaft (14) can be applied. 5. Switching mechanism according to claim 4, characterized in that the actuator (82) to the rear end face of the Conical recess (88) having flange (72) of the receiving member (74) can be placed, 6. Switching mechanism according to claim 5, characterized in that the actuator (82) to the rear end face of the Conical recess (88) having flange (72) of the receiving member (74) can be placed. - 17 - 409885/0275 A 4o o92 b
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6.7.73 7. Switching mechanism according to claim 5 or 6, characterized in that the diameter of the flange (72) is substantially corresponds to the diameter of the cam disks (26, 28) arranged on the switching shaft (14). 8. Switching mechanism according to one of the preceding claims, its the drivable bearing stub. opposite Bearing stub for coupling another rear derailleur the housing protrudes, characterized in that the output-side bearing stub (22) with the selector shaft (14) can be coupled and one coupling half (92) on its carrier part (74) against the action of an energy store (91) is arranged accordingly displaceable. 9. Switching mechanism according to one of the preceding claims, its switches arranged along the switching shaft on a common one arranged close to the cam disks and these optionally partially overlapping girder bridges are arranged, characterized in that that the carrier bridge (38) can be detached from its holder and moved away from the cam disks (26, 28). 10. Switching mechanism according to claim 9, characterized in that the girder bridge (38) is made up of two coaxially arranged swivel bolts (46, 47) fixed to the housing, defined swivel axis arranged parallel to the shift shaft axis can be pivoted and locked in its position of use. A09885 / 0275 Read more