Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
  • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
  • B23Q3/155—Arrangements for automatic insertion or removal of tools, e.g. combined with manual handling
  • B23Q3/1552—Arrangements for automatic insertion or removal of tools, e.g. combined with manual handling parts of devices for automatically inserting or removing tools
  • B23Q3/15526—Storage devices; Drive mechanisms therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
  • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
  • B23Q3/155—Arrangements for automatic insertion or removal of tools, e.g. combined with manual handling
  • B23Q3/157—Arrangements for automatic insertion or removal of tools, e.g. combined with manual handling of rotary tools
  • B23Q3/15713—Arrangements for automatic insertion or removal of tools, e.g. combined with manual handling of rotary tools a transfer device taking a single tool from a storage device and inserting it in a spindle
  • B23Q3/1572—Arrangements for automatic insertion or removal of tools, e.g. combined with manual handling of rotary tools a transfer device taking a single tool from a storage device and inserting it in a spindle the storage device comprising rotating or circulating storing means
  • B23Q3/15724—Chains or belts

Definitions

• the present invention relates to a machine tool for the cutting machining of workpieces, which machine tool comprises at least one tool spindle with a spindle receptacle for mounting a machining tool and at least one chain magazine, which chain magazine has a multiplicity of magazine locations for holding a multiplicity of machining tools, the chain magazine having at least one movable chain, which is arranged such that it can be moved back and forth on a closed chain running path, and on which the magazine locations are formed.
• Such a machine tool is known from DE 43 11 469 CI.
• the known machine tool is a so-called travelling column machine.
• the spindle head is suspended vertically by the tool spindle from a so-called travelling column.
• the tool spindle can be moved up and down in a vertical direction on the travelling column, which for its part is arranged on a so-called cross part, which permits movement of the travelling column in two horizontal directions orthogonal to each other.
• the known machine tool is provided with a chain magazine with a chain which is guided in a chain running path and on which magazine locations for machining tools are arranged, the chain running path being led around the outer periphery of the cross part and fastened to the cross part.
• the chain magazine is therefore taken along during the movements of the cross part.
• This arrangement of the chain magazine permits the insertion and removal of a machining tool in the so-called pick-up process.
• the tool spindle deposits a machining tool directly into a magazine location or picks it up directly from a magazine location which is located in a transfer position that the tool spindle can reach.
• a gripper acting between the tool magazine and the tool spindle is not required in this process.
• the known machine tool permits very quick tool changes, and consequently very short chip-to-chip times.
• a travelling column machine with a stationary chain magazine arranged on the machine frame is known from DE 10 2006 058 221 Al.
• This chain magazine allows a greater number of machining tools to be stored, here too the tool change being performed in a pick-up process.
• DE 199 19 446 Al discloses a machine tool in which a chain magazine is arranged to the side of the travelling column of the machine.
• the chain magazine can be pivoted into the working area of the tool spindle and pivoted out again from the working area.
• DE 103 44 642 Al describes a machine tool with two tool spindles, which are supplied with machining tools by way of a common chain magazine, the chain magazine being moved into the working space for making a tool change.
• chain magazines are used not only used in the case of travelling column machines but also in the case of all other types of machine tool, since they can be formed in such a way as to optimize costs both for small capacities (for example as from 20 machining tools) and for large capacities (for example 120 machining tools).
• the lengthening of the chain also has an adverse effect on the wear of the chain and of the chain running path because of the reduction in chain tension.
• Document DE 10 2005 034 534 Al discloses a chain magazine like magazine having tensioning means for permanently tensioning the chain.
• Document DE 25 31 948 Al discloses a machine tool equipped with a chain magazine comprising a chain and a chain wheel.
• a "part of the chain running path” is understood as meaning a mechanical arrangement which comprises specific portions of the chain running path which, possibly together with supporting parts, struts or other components, are combined to form a unit that can be moved as a whole.
• the chain running path is therefore divided into two units or parts that are mechanically movable with respect to each other and has at the transition from one part to the other at least one gap which interrupts the chain running path and is bridged by the chain, which however to the knowledge of the inventor is unproblematic.
• gaps can also be found, for example, where the chain projects from a portion of the chain running path to a chain wheel, which is integrated in the chain running path as a drive for the chain.
• the chain running path is therefore divided into two such parts, the first of which is stationary.
• Stationary means in this connection that the first part does not move when the tensioning unit is actuated, that is to say during the automated tensioning of the chain.
• the stationary part may in this case be arranged fixed in place, for example on the machine frame, but it may also be provided with a travel drive of its own, by way of which it is moved or pivoted into the working space for making a tool change. It may, however, also be arranged such that it can travel along with some part of the machine tool, for example on the cross part.
• the second part of the chain running path follows all the movements of the first path, but during the automated tensioning operation it is additionally adjusted with respect to the first part, whereby the gaps in the chain running path change.
• Automated means in this connection that the tensioning unit is activated by way of the usual machine control or a separate control unit, in other words that the tensioning is performed under program control without any manual intervention.
• the tensioning of the chain can be performed at any time when the chain is not travelling on the chain running path, it being nevertheless possible to tension the chain when the chain magazine as a whole is being moved, for example because it is being moved into the working space for making a tool change.
• the tensioning of the chain consequently does not require any manual intervention, which eliminates the associated disadvantages, so that the lifetime of the chain and the chain running path is extended.
• the tensioning of the chain may also be carried out at production or main time, that is to say during the machining of a tool with a machine tool, and therefore does not entail any loss of productivity.
• the tensioning unit provides an automated adjusting function and an automated clamping function.
• the tensioning operation then proceeds in such a way that the adjusting function exerts an adjusting force which is directed such that it pushes the second part of the chain running path away from the first part.
• the clamping function is deactivated shortly before or after the application of the adjusting force, the second part of the chain running path moves away from the first part, whereby the chain is tensioned.
• the clamping function is reactivated, so that the second part of the chain running path is arrested with respect to the first part and cannot be adjusted any further. After that, the adjusting force is possibly switched off again.
• the adjusting function serves for pushing the second part away from the first part of the chain running path
• the clamping function serves for selectively arresting the second part with respect to the first part of the chain running path such the no relative movement between the first and second part is possible.
• the functions of the tensioning unit may in this case be provided by way of clamping and adjusting units which are actuated hydraulically, pneumatically, electrically or by way of spring force.
• the automatic adjusting function is provided by way of a stop, which is connected to the second part of the chain running path and interacts with a thrust block, the stop and the thrust block being movable in relation to each other.
• the thrust block may in this case be attached to the travelling column, the cross part or some other component of the machine tool that is customarily moved.
• the thrust block By moving the component by means of the drive that is provided in any case for this, the thrust block first comes to lye close to the stop.
• the clamping function is deactivated, during the further moving of the component the second part of the chain running path is adjusted with respect to the first part and the chain is thereby tensioned. After that, the clamping function is reactivated.
• the thrust block may be arranged stationarily.
• the stop comes up against the thrust block and, after the clamping function is deactivated, during the further moving of the component the chain is tensioned.
• the second part of the chain running path is connected to the first part of the chain running path by way of at least one linear guide.
• the second part of the chain running path is connected to the first part of the chain running path such that it can be pivoted about an axis.
• the pivoting connection about the axis has the advantage here that between the axis and the point of engagement of the tensioning unit there forms a lever arm, which together with the rolling bodies that are customarily used in the case of a pivoting connection permits easy and dependable pivoting of the second part of the chain running path about the axis even after a prolonged standstill.
• the axis is the axis of a chain wheel that serves for driving the chain.
• an axis that is present in any case can, as it were, have a dual use, while it can be regarded as a further advantage that only one further gap has to be inserted into the chain running path, since the portion of the chain running path adjacent the chain wheel already has a gap in relation to the chain wheel. It is also of advantage that this gap scarcely changes, or does not change at all, during the pivoting of the second part of the chain running path if the second part of the chain running path is pivoted centrally about the axis of the chain wheel in such a way that this gap only changes its angular position in relation to the chain wheel.
• the adjustable second part of the chain running path substantially comprises a rear path portion, which is remote from a front path portion that is assigned to the tool spindle.
• the chain tensioning is performed, as it were, behind the machine tool, that is to say outside the area where the transfer position to the tool spindle lies.
• it is of advantage that, when retrofitting the new chain magazine on an existing machine tool, no changes are required to the transfer position between the chain magazine and the tool spindle, which is located on the front path portion.
• the second part of the chain running path comprises two portions of a side path portion of the chain running path that are each mounted pivotably about an axis of their own on the first part of the chain running path.
• a side path portion of the chain running path that extends from the front path portion to the rear path portion of the chain running path is divided into two adjustable portions which are separated from the rest of the chain running path by a gap located between them and a respective gap in relation to the front path portion and the rear path portion.
• the axes are in this case located in the area of the transitions of the side path portion to the front or rear path portion.
• the two adjustable portions are then pivoted outward in such a way that the gap between them increases.
• Fig. 1 shows a simplified representation of a preferred embodiment of the new machine tool in a schematic side view
• Fig. 2 shows the machine tool from Fig. 1 when a tool change is being made
• Fig. 3 shows a plan view from above of a first embodiment of the chain magazine on the machine tool from Fig. 1, in a schematic representation not to scale,
• Fig. 4 shows a second embodiment of the new chain magazine in a representation such as that in Fig. 3,
• Fig. 5 shows a third embodiment of the new chain magazine in a representation such as that in Fig. 3,
• Fig. 6 shows a fourth embodiment of the new chain magazine in a representation such as that in Fig. 3, and
• Fig. 7 shows a fifth embodiment of the new chain magazine in a representation such as that in Fig. 3.
• FIG. 1 an embodiment of the new machine tool that is denoted overall by the reference numeral 10 is represented in a schematic side view not to scale.
• the machine tool 10 has a travelling column 12, which is arranged by way of a first slide guide 14 on a cross part 16.
• the travelling column 12 can be moved with the aid of the first slide guide 14 on the cross part 16 in the direction of an axis, which is usually referred to as the y axis and is symbolically represented here by an arrow 18.
• the travelling column 12 is moved in a motorized manner on the first slide guide 14, a corresponding drive not being shown here for reasons of overall clarity.
• the cross part 16 is mounted on a machine frame 22 by way of a second slide guide 20.
• the second slide guide 20 permits a movement of the cross part 16 along a second axis, which is represented here at the reference numeral 24.
• the reference numeral 24 denotes the so-called x axis. It goes without saying that the movement of the cross part 16 on the second slide guide 20 is performed with the aid of a suitable drive, which is not represented here for reasons of overall clarity.
• a spindle head 25 with a tool spindle 26 rotatably mounted therein is mounted in a vertically suspended manner on the travelling column 12.
• the tool spindle 26 has at its lower end a spindle receptacle 28, in which a tool holder 29 with a machining tool 30 attached thereto can be mounted in a known way.
• the tool holder is typically standardized and is of the steep taper (ST) or hollow shank taper (HST) type.
• ST steep taper
• HST hollow shank taper
• the tool spindle 26 is formed for the purpose of rotating the machine tool 30 about its spindle axis 32, which is represented by an arrow 34.
• the tool spindle 26 is capable of rotating the machine tool 30 at several thousand revolutions per minute, in order in particular to permit a drilling and milling machining of metallic workpieces.
• the tool spindle 26 can be moved on the travelling column 12 in the direction of an arrow 36, that is to say here in the vertical direction. Accordingly, the tool spindle 26 is mounted on the travelling column 12 by way of a third slide guide 38.
• the movement of the tool spindle 26 in the direction of the arrow 36 is usually referred to as the z axis.
• the three slide guides 14, 20 and 38 for the three axes of movement 18, 24, 36 extend orthogonally in relation to one another.
• the reference numeral 40 denotes a work table which is mounted on the machine frame and on which a workpiece 42 to be machined is mounted.
• the work table 40 may, for example, be a turntable, which permits a pivoting movement of the workpiece 42 about a vertical axis.
• the work table 40 may be mounted in a bridge (not represented here), which permits a further pivoting movement of the workpiece 42 about a horizontal axis.
• a workpiece spindle may be used, so that the machine tool 10 can carry out both a turning machining and a milling and drilling machining.
• the reference numeral 44 denotes a housing, which encloses the components of the machine tool 10 described so far.
• the reference numeral 46 denotes a control unit, with the aid of which all the movements of the machine tool 10 and auxiliary units (coolant supply, compressed air and the tool magazine described below) are controlled.
• the machining tool 30 can be moved in a working space denoted by 48, in order to machine the workpiece 42 there.
• Various machining tools 30 are used during this machining, stored in a chain magazine 50 that is only schematically represented in Fig. 1.
• this chain magazine 50 is arranged around the cross part 16.
• the chain magazine 50 can be seen more precisely in Fig. 2. It has a closed chain 52, which can be moved back and forth and in which a multiplicity of magazine locations in the form of holders 54 are located.
• the holders 54 are schematically represented here as tong-like elements, which serve for receiving in each case a tool holder 29 loaded with a machining tool 30.
• the basic structure of such a magazine chain with holders 54 is known to those skilled in the art and accordingly is not explained in any more detail here.
• the chain 52 is mounted on a closed, horizontally arranged chain running path 56.
• the chain running path 56 is fixedly connected to the machine frame 22 by way of supports 58.
• the chain magazine 50 is a stationary chain magazine, which is arranged around the cross part 16 of the machine tool 10, and the chain 52 of which runs around in a horizontal plane, which is defined by the x and y axes 24, 18.
• the travelling column moves rearward in the y direction 18, that is to say to the right in Fig. 1. This is the state shown in Fig. 2.
• the tool spindle 26 is now located above a transfer position denoted by 59, in which there is in the state according to Fig. 2 an empty location, that is to say an empty holder 54, into which the tool spindle 26 then deposits the tool holder 29 with the machining tool 30 that has been in use until then.
• the chain 52 then moves a loaded holder 54 into the transfer position 59 under the tool spindle 26, in which a tool holder 29 with a machining tool 30 now intended to be used is located.
• This type of tool change is referred to as a pick-up process.
• the machine tool 10 shown in Figs. 1 and 2 is a travelling column machine with a vertical tool spindle 26 and a fixed chain magazine 50, in which all three axes of movement 18, 24, 36 are realized in the machining tool 30.
• the chain magazine 50 newly designed according to the invention and described in detail below may, however, also be used on other types of machine tool in which, for example, the tool spindle is horizontally arranged and/or the axes of movement 18, 24, 36 are not realized in the machining tool 30 at all or in part, but in the workpiece 42.
• the newly designed chain magazine 50 may be formed both as a stationary chain magazine - as in Figs. 1 and 2 - and as a chain magazine travelling along with the travelling column 12 or the cross part 16.
• the chain magazine 50 may in this case also be arranged alongside the cross part 16 or above the cross part 16 and/or alongside the travelling column 12.
• the tool change may be performed with the aid of a gripper, which grips the tool holder 29 mounted in the tool spindle 26 and deposits it in an empty holder 59, in order for them to remove another tool holder 29 from another holder 54 of the chain magazine 50 and insert it into the spindle receptacle 28 of the tool spindle 26.
• a gripper which grips the tool holder 29 mounted in the tool spindle 26 and deposits it in an empty holder 59, in order for them to remove another tool holder 29 from another holder 54 of the chain magazine 50 and insert it into the spindle receptacle 28 of the tool spindle 26.
• the gripping, moving and depositing of the two tool holders 29 to be changed one for the other may also be performed entirely, or for the most part, at the same time in push-pull operation.
• FIG. 3 a schematic plan view of the chain magazine 50 from Fig. 1 is shown, the parts of the machine tool 10 that are not relevant for the description of the new design of the chain magazine 50 no longer being shown.
• the chain magazine 50 has a substantially rectangular chain running path 56, which consists of a U profile which is open to the side and in which the chain 52 indicated by dashed lines can be moved clockwise and counterclockwise, which is indicated by a double-headed arrow 61.
• the chain links and the magazine locations provided at the chain links are not shown in Fig. 3 for reasons of overall clarity.
• the chain running path 56 comprises two relatively long side path portions 62, 63, a relatively short front path portion 64, which in Figs. 1 and 2 is facing to the left toward the tool spindle 26 and provides the transfer position 59, and a correspondingly long rear path portion 65.
• a chain wheel 66 Arranged at the transition between the right-hand side path portion 63 and the rear path portion 65 is a chain wheel 66, which is separated from the chain running path 56 by way of gaps and is driven rotatably about an axis indicated at 67.
• the chain wheel 66 likewise has an outwardly open U profile 68, in which the chain 52 runs.
• the chain wheel 66 serves for moving the closed chain 52 in the U profile 60, and consequently for positioning holders 54 under the tool spindle 26, as is known per se.
• the chain running path 56 is mounted with the front path portion 64 and the respectively large portion of the two side path portions 62, 63 on the machine frame 22 schematically indicated in Fig. 3.
• This stationary first part of the chain running path is denoted overall in Fig. 3 by 69.
• the second part of the chain running path that is to say the rear path portion 65 and the smaller path portions of the side path portions 62, 63, is adjustable with respect to the stationary part 69; it is denoted as a whole by 70.
• the mounting plate 73 is mounted linearly dis- placeably in the direction of a double-headed arrow 74 on the machine frame by way of guides 71, 72.
• the adjustable part 70 of the chain running path 56 that is to say the rear path portion 65 and the rear portions of the side path portions 62, 63 of the chain running path 56.
• the chain wheel 66 also mounted on the mounting plate 73 in the embodiment of Fig. 3 is the chain wheel 66, with its drive arranged under the mounting plate 73 in Fig. 3 and therefore not visible. It goes without saying that the chain wheel 66 may also be attached at some other location within the chain running path 56 and does not have to belong to the adjustable part 70 of the chain running path 56.
• the left-hand and right-hand side path portions 62, 63 of the chain running path 56 are respectively interrupted by a gap 75 and 76, which becomes greater or smaller when the mounting plate 73 is displaced in the direction of the arrow 74.
• the stationary part 69 of the chain running path 56 is fastened such that it is fixed in place on the fixed-in-place machine frame 22; it is therefore itself fixed in place or fixed. It goes without saying that the stationary part 69 of the chain running path 56 may also be arranged such that it can travel along on the cross part 16 or be displaceable for example on the machine frame 22. What is important, however, is that the adjustable second part 70 of the chain running path 56 can be displaced or pivoted with respect to the first part 69 of the chain running path without the position of the stationary part thereby changing.
• an adjusting unit 77 which is fastened with its drive housing 78 on the mounting plate 73 and with its piston 79 on the machine frame 22. If the piston 79 is extended in the direction of an arrow 80 out of the drive housing 78, the mounting plate 73 moves on the guides 71, 72 upward in Fig. 3 and the gaps 75, 76 in the side path portions 62, 63 of the chain running path 56 become greater.
• a clamping unit 81 Arranged alongside the adjusting unit 77 is a clamping unit 81, which is fastened with its clamping part 82 on the mounting plate 73 and with its piston 83 on the machine frame 22. When the clamping part 82 arrests the piston 83, the mounting plates 73 cannot be displaced on the guides 71, 72.
• the adjusting unit 77 may be designed as a hydraulic, pneumatic or electrical adjusting drive, which can move its piston 79 out of or back into the drive housing 78 in a way known per se.
• the drive housing 78 there may also be arranged a spring assembly which merely pushes the piston 79 out of the drive housing 78.
• the clamping unit 81 may be formed as a hydraulically, pneumatically or electrically actuated clamping unit, which, when actuated correspondingly, arrests the piston 83 with positively or non-positively locking engagement. Clamping units of this type as such are likewise known.
• the automated adjusting unit 77 and the automated clamping unit 81 are provided for this purpose. Automated means in this connection that, for tensioning the chain 52, the adjusting unit 77 and the clamping unit 81 are activated by way of the control unit 46, that is to say that the tensioning is performed under program control without manual intervention.
• control unit 46 activates the adjusting unit 77 in such a way that it pushes the piston 79 in the direction of the arrow 80.
• control unit 46 activates the clamping unit 81 in such a way that it opens the clamping part 82, so that the piston 83 in the clamping part 82 is freely displaceable in the direction of the double-headed arrow 74.
• the mounting plate 73 is now displaced in the direction of the arrow 74 in such a way that the width of the gaps 75, 76, and consequently the length of the side path portions 62, 63 of the chain running path, becomes greater, whereby the chain 52 is tensioned.
• the clamping unit 81 is reactivated and then arrests the piston 83, so that the mounting plate 73 is fixed again with respect to the machine frame 22.
• the pushing force and/or the amount of adjustment may be prescribed as a fixed value in the control unit 46, but they may also be respectively determined for the machining program that is currently being carried out on the machine tool, and adapted, in dependence on various operating parameters such as the age of the chain 52, the number and weight of the machining tools 30 stored in the chain 52, the travelling distances covered by the chain 52 since the last tensioning of the chain 52 and/or accelerating and decelerating processes that have been undergone, etc.
• the adjusting unit 77 includes a compression spring cartridge, which is seated in the drive housing 78 and pushes the piston 79 with a constant tensioning force in the direction of the arrow 80. As soon as the clamping unit 82 is opened, the mounting plate 73 is therefore displaced until the chain tension corresponds to the tensioning force of the compression spring cartridge.
• This equilibrium is either sensed by measuring instruments, and detected for example from the fact that the mounting plate 73 is no longer displaced on the guides 71, 72, or the clamping unit 81 is opened for a prescribed period of time, based for example on empirical values, which is sufficiently long to permit the tensioning of the chain 52. After that, the clamping unit 81 is reactivated and the piston 83 is once again arrested.
• the clamping unit 81 may also be integrated in the adjusting unit 77, but according to the invention there is provided both an adjusting or tensioning function and, separately therefrom, a clamping or arresting function, which is actively actuated independently of the adjusting unit by way of the control unit 46.
• the chain magazine 50 is constructed in the same way as in the embodiment from Fig. 3, but the adjusting unit 77 is replaced by a stop 88, which is fastened on the mounting plate 73 and interacts with a thrust block 89, which is fastened to a rear side 90 of the travelling column 12, as can be seen in Fig. 2.
• FIG. 5 shows a chain magazine 50, which is arranged on the machine frame 22 and likewise has two side path portions 62, 63, a front path portion 64 and a rear path portion 65 of its chain running path 56 and a chain wheel 66 at the transition between the rear path portion 65 and the right-hand side path portion 63.
• a mounting plate 92 is provided, but it is not mounted in a linearly displaceable manner but by way of rolling bodies (not shown) at an axis 93 on the machine frame 22, about which it can be pivoted in the direction of an arrow 94.
• the axis 93 is located approximately at the level of the lower fifth of the side path portion 62.
• the tensioning unit 99 combines the adjusting function of the adjusting unit 77 and the clamping or arresting function of the clamping unit 81 from Fig. 3.
• the piston 101 can therefore be extended under program control in the direction of an arrow 102 and arrested in its respective position.
• the entire left-hand side path portion 62 is the entire left-hand side path portion 62 and in each case a short portion of the front or rear path portion 64 or 65.
• the left-hand side path portion 62 is separated in the middle by a gap 109; gaps 111 and 122 are respectively provided in the rear and front path portions 65, 64.
• the mounting plates 105, 106 again carry the adjustable part of the chain running path 56, which is denoted here by 113, while the fixed part of the chain running path 56 is mounted as previously on the machine frame 22 and is denoted here by 114.
• the tensioning unit 99 known from Fig. 5, the piston 101 of which acts by way of a pushing part 115 on the mounting plates 105 and 106 in the region of the gap 109.
• the piston 101 When the piston 101 is extended in the direction of the arrow 102, the mounting plates 105, 106 pivot in the direction of arrows 116 and 117 about their axes 107 and 108, respectively, which has the result that the gap 109 opens outward, so that the length of the side path portion 62 increases.
• the gaps 111 and 112 behave in this case in the same way as the gap 97, so that reference is made to the description given in this respect in conjunction with Fig. 5.
• FIG. 7 corresponds to that in Fig. 5, the only difference being that here a mounting plate 117 which is mounted pivotably about the axis 67 of the chain wheel 66 on the machine frame 22 is provided.
• the rear path portion 65 and a small portion of the left-hand side path portion 62 form here the adjustable part of the chain running path 56 that is denoted by 118; the fixed or stationary part of the chain running path is denoted by 119.
• the left-hand side path portion 62 is interrupted by a gap 120.
• the tensioning unit 99 known from Fig. 5, the piston 101 of which is fastened in an articulated manner on the mounting plate 117.

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Citations (9)

• 2010
  • 2010-09-27 DE DE102010047557.2A patent/DE102010047557B4/de active Active
• 2011
  • 2011-09-26 WO PCT/EP2011/066662 patent/WO2012041806A1/en active Application Filing

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