Positioning and blocking device for tool carrier in a cutting apparatus

The present invention has for an object centering and locking device of a frame toolholders in a cutting press, including in a cutting press for labor paper or cardboard, according to the preamble of claim 1 and as known from US-A-3786731.

The cutting presses known to date, for the work of paper or cardboard to making cuts of folding cartons are usually composed of several stations work arranged one following the other, these workstations being commonly designated in about them in the press, margin station or introduction station cutting, stripping station and finally station reception.

In this kind of machines, paper or cardboard is generally in the form of substantially rectangular sheets. these sheets are taken from the top of a stack placed in the Margin station to be brought up to the organs transport for the lead through carving stations, ejection and reception.

In one of these blanking presses, the cutting station generally comprises a bedspring upper or top rail fixed between two side frames and a lower beam or platinum lower movable vertically. The cutting tool, being in the form of a plate provided with cutters and scoring rules, is set against the lower portion of the upper beam so that, during the vertical movement up and down in lower movable beam, the cutting of the sheet of paper or paperboard is achieved. It goes without saying that can be cut, at one time, many Boxes cuts spread over the surface of a leaf. By the configuration of the blanks boxes, there are still between them-small waste it is necessary to remove to get to the receiving station, a semi-finished product in the form of a sheet composed of a plurality of box blanks interconnected by small attachment points that will then break to separate each blank from one another.

Small waste we just talk are removed from the sheet in the ejecting station which normally comprises an upper tool and a lower tool between which is mounted a plate pierced with openings are arranged exactly in front of the waste to be ejected. These openings have over the same geometric shape as the shape of waste. The superior tools, and lower the plank openwork are driven in a vertical movement of the bottom top and top to bottom synchronized with advance sheets in the machine. The upper tool ejection is composed of a rectangular frame on which are mounted the ejection members posing usually in the form of ejection pins telescopic. These ejection needles can be fixed adjustably as cross linking lateral or longitudinal bars of the frame rectangular such that can be the positioning the locations of waste and eject it opposite telescopic needles mounted on lower ejection tool. In another version, higher ejection tool can be in the as a plank of wood in which it was planted, the selected locations, non-telescopic hands while the lower ejection tool comprises about its telescopic needles placed opposite needles higher ejection tool.

As follows from what we have describe the waste is pinched between the needles upper and lower tools and pushed towards the down through the openings in the perforated board during the vertical movement of the organs ejection. Such ejection station is described in more detail in US Patent 3,786,731.

The punch press can of course perform different jobs matching several kinds and cuts of formats, should be adjust the ejection of tools position according to each job and of course change the perforated board to adapt a satisfying to work to achieve. Generally, each of different tools or cutting or ejection, are centered along the median axis of the machine and by respect to a reference located on this central axis, to the front portion of each tool in such a way that their relationship tracking is ensured with maximum precision and ensures the repeatability positioning during extraction or their mounting in their respective stations. For facilitate these adjustments is provided can withdraw the lower and upper tools board apertured of the machine. This is done in laterally extracting these elements of stripping station, as you would with a drawer. To do this, the upper die, the lower and perforated board are inserted into chacuns Backstage appointed in their cradles then centered and locked in their position job. It is very important that the centering of these tools occurs with high accuracy for guaranteed by the relative position between the upper and lower needles and with the apertures in the perforated board. In the ejections stations known to date, the board perforated and the upper and lower tools are centered by means of a first integral squab one of the longitudinal bars of the tool-supporting frame and a second squab secured to the other bar Longitudinal this framework. The frame lock tool holder is further combined with the second centering squab. A position adjustment lateral and longitudinal position of the tool is also possible by acting on the squab centering. In summary, the centering of the tool is carried out in two points located at substantially the half the length of the longitudinal bars of part toolholders. The frame lock tool holder is effected by means of a hook, integral with the cradle, which provides, by clamping using a hexagonal screw, on the end of second centering squab.

Using this centering device and lock has several disadvantages. First, with only two centering points located on each side of the tool-supporting frame, it product when locking a part of deformation which is detrimental to the positioning accuracy on between the upper and stripping tools lower and the perforated board, which in the case ejecting very little waste is not eligible. A deformation of the tool frame can also be caused by the mounting of the bars support for stripping pins and in this case the Failure to use two centering points will not compensate for this distortion. It is more evident that the rigidity of the frame, once centered and locked, will not be very good due its retention by just two points. In addition, the misalignment between the upper needle and lower causes the tipping of waste eject and thus jams require discontinuation of the machine. This deformation also influences the registration between the tools mounted in the other stations of the machine. It must then take up the that the locking operation requires the use of a tool to block the hexagonal screws capable of blocking the tool-supporting frame.

In the area of ​​cardboard, users of punch presses are increasingly confronted with varied work requiring several tool changes and their main concern lies in the drastic reduction of time allocated to these operations so as to increase as much as possible the actual production time of their machines. Faults relating to the positioning accuracy different tools for cutting press being also a source of malfunction causing jams, they must also be removed to increase the effective production machine.

The present invention aims to overcome the aforesaid drawbacks by providing the user with a centering device and lock frames tool holder that is accurate, reliable and installation and Quick release.

For this purpose, the device according to the invention is consistent with what is stated in claim 1.

The invention will be better understood from studying the description of an embodiment of a device centering and locking given by way of example with reference to the accompanying drawings in which :<ul><li>Figure 1 is a general schematic view view of an ejection station,</li><li>Figure 2 is a front view of a station ejection,</li><li>Figure 3 is a schematic view in view of an upper frame tool holder,</li><li>Figure 4 is a schematic plan view the perforated carrier plate frame,</li><li>Figure 5 is a profile view, in section in part, a first locking member of a a senior tool holders,</li><li>Figure 6 is a profile view, in section part, of one of econd a locking member a senior tool holders,</li><li>Figure 7 is a view on A of Figure 5,</li><li>FIG 8 is a view according to B of FIG 5,</li><li>Figure 9 is a view C of Figure 6</li><li>FIG 10 is a view on D in Figure 6</li><li>Figure 11 is a side view of a profile latch member of a holding frame board openwork,</li><li>Figure 12 is a sectional view according XII-XII of Figure 11.</li></ul>

Figure 1 is a general schematic view of an ejection station 1 of a press cut. This ejection station comprises a tool top 2 appearing in the example, under the form of a wooden board 3 provided with needles ejection 4. The upper tool 2 is held in a upper support frame 5 can slide the manner of a drawer in grooves, not shown, fixed to an upper cradle 6, vertically movable under the effect of a device in 7 and pulls levers 8 and 9 (see Figure 2).

The ejection station 1 also comprises a tool below 10 kept in a lower support frame 11 can also slide in the manner of a drawer slides, not shown, fixed on a lower cradle 12, vertically movable under the action of a lever arrangement 13 and drawbar 14 and 15 (see Figure 2). Generally, the lower tool comprises a plurality of bars 16, of which only a few have been shown to do not detract from the clarity of the figure. a series telescopic stripping pins 17 is mounted on these bars 16 opposite to the ejection needles 4 of the top tool 2. Finally, the stripping station 1 comprises a third element in the form of a perforated plate 18 mounted on a frame 19 which can itself also be extracted from the stripping station 1 to the manner of a drawer. The perforations of the plate 18 are made so as to take account of the shape of Waste ejecting and stripping pins 4 and 17, disposed facing each other, clamp the waste and push through perforations the plate 18 when the cardboard sheet to work is stopped in the stripping station.

Figure 3 is a schematic view in view of an upper tool-supporting frame 20 including a front bar 21 and a rear bar 22 connected by two cross members 23 and 24 so as to form a rigid frame. In addition, the front and rear bars 21 and 22 are braced by two other webs 25 and 26. In the example chosen, the sheet work happens in the stripping station in direction indicated by the arrow 27 and the frame toolholder top 20 will be removed from this station, for example during a change of tools perpendicularly to the direction of the arrow 27. This figure also represents, schematically, the centering and locking frame tool holder 20. The front part of this framework 20, at the front bar 21 is equipped with a guide block 28 having a groove 29 in which engages a guide member 30 permitting the displacement of the frame in the direction indicated by the double arrow 31. Also on the front of the frame 20, opposite the guide block 28, is a locking pin 32 having a groove 33 and a bore 34 in which the centering squab and locking 61 is engaged. The part back of the frame 20 at the rear of bar 22, is provided with another guide stud 35 having a groove 36 in which engages a member of guide 37 allowing the displacement of the frame 20 in the direction indicated by the double arrow 38. A the opposite of what guide stud 35, the rear portion the frame 20 has a supporting member 39 which is simply constituted by part of the guide in the slide 85. This provision of the guides, the centering and locking the frame 20 provides a excellent rigidity of the frame 20 when the latter is locked machine.

It is noted that the frame construction lower tool carrier is made following the same principle, with the sole difference that the studs of guide 28 and 35 and the centering pin and lock 32 will be reversed so as to the grooves 29, 33 and 36 are turned down the part toolholders.

Figure 4 is a schematic plan view of the Framework board ejection door 40. The board ejection is constituted by a perforated plate 41, represented here without perforations corresponding to waste sites to be ejected. this plate perforated 41 is fixed on a frame 42 by means of fastening lugs 43 and screws 44 screwed into brackets 45 fixed on adjustable support bars 46 resting on the crossbar 47 of frame 40 and a crossbar 48, also adjustable, connecting the two longitudinal bars 49 and 50 connect the crossbar 47 at the bar cross back 51 of the frame 40. The bars transverse front 47 and rear 51 engage in backstage 52 and 53 secured to a mobile cradle 54 actuated by a pivoting lever 55. This lever 55 pivots about a pivot point 56 located at near the rear crossbar 51 under the effect of a control means which is not shown here. Mobile cradle is connected to 54 lever pivot 55 by an adjustable centering member 57 and by a centering and locking device 58 which will be described in detail in connection with Figures 11 and 12.

Figure 5 is a profile view, in section in part, a first locking member and 59 centering an upper tool-supporting frame 20. This figure represents the front part of the frame toolholder 20 and in particular the front bar 21 when it is engaged in the slide 60 upper cradle 6. The first locking member and centering 59 has a flexible rod 62, fixed at one of its ends, in a slotted pin 63 to using two screws 64. The split pin 63 is secured the slide 60 of the top cradle 6. This rod hose 62 passes through the upper part centering and locking squab 61 that has a countersink having two inclined planes 65 and 66 in opposition, the inclined planes being roof shape. Squab centering and lock 61 is mounted in a bushing 74 fixed on an adjustment gib 75 provided at one of its ends of an adjusting stud 76 receiving a rod 77 threaded through an anchor attached to post 78 Higher cradle 6. The nuts 79 mounted on the rod threaded 77 will therefore adjust the desired position of the squab of centering and Lock 61 by moving to the gib adjustment 75, the latter being guided in a slot elongated 80 into which engages a pin cylindrical 81. The other end of the flexible shaft has a handle 67. In order to be maintained in a locking position and in an unlocking position, the flexible rod 62 engages in a bayonet bracket 68 whose form is visible in Figure 7 which will be described further, the bracket 68 being secured to the bayonet adjustment gib 75. In the position shown in Figure 5, the frame upper tool holder 20 is in centered and locked position, i.e. the conical part of the squab of centering and Lock 61 is engaged in the bore 34, thereby preventing any lateral extraction of this tool-supporting frame 20. This is further maintained, in the part opposite the locking lug 32, by the guide member 30 which engages in the groove 29 the guide pin 28. The guide member 30 is consisting of a guide pad 69 having a nose 70 with two inclined planes 71 and 72 (see 8) which will act jointly with the flanks inclined 82 and 83 of the groove 29 of the guide stud 28 (see also Figure 8) to provide precise guiding of the frame tool holder 20. The pad guide 69 is fixed to the slide 60 of the cradle top 6 with two screws 73. unlock tool carrier frame 20, simply move the flexible shaft 62 in the bayonet square bayonet 68, until the squab centering and locking 61 come 61a occupy the position shown in phantom, so that the squab centering and lock is released from its bore 34 and permits the extraction side of the frame tool holder 20.

Figure 6 is a profile view, in section in part, a second locking member and 84 centering an upper tool-supporting frame 20. This figure shows the rear frame toolholder 20, in particular the rear bar 22 when it is engaged in the slide 85, 6. The second cradle upper body locking and centering 84 includes a rod hose 86, attached to one of its ends, in a split pin 87 with two screws 88. The split plot 87 is integral with the slide 85 of the cradle top 6. This flexible rod 86 passes through of the upper centering squab and 89 which has a locking countersink with two inclined planes 90 and 91 in opposition, the inclined planes being shaped roof. The centering and locking squab 89 is mounted in a sleeve 92 fixed to an adjustment gib 93 provided at one of its ends with an adjusting stud 94 receiving a threaded rod 95 passing through a pad anchor 96 attached to the upper cradle 6. Nuts 97 mounted on the threaded rod 95 will this is to adjust the desired position of the squab centering and locking 89 by moving adjusting gib 93, the latter being guided in a elongated slot 98 into which engages a pin cylindrical 99. The other end of the flexible shaft 86 is equipped with a handle 100. In order to be able be held in a locking position and in an unlocking position, the flexible shaft 86 engages in a bayonet bracket 101 whose form is shown in Figure 9 which will be described further, the bracket 101 being fixed to the bayonet adjustment gib 93. In the position shown in Figure 6, part upper tool holder 20 is in centered and locked position, that is to say the conical part of the squab of centering and Lock 89 is engaged in the groove 36, thereby preventing any lateral extraction of this tool-supporting frame 20. This is further maintained, in the part opposite the locking lug 35, by the bearing member 39 which acts against the faces interior of the slide 85 (see Figure 10). For unlock tool carrier frame 20, simply move the flexible shaft 86 in the bayonet square bayonet 101 until the squab centering and locking 89 come 89a occupy the position shown in phantom, so that the squab centering and locking is disengaged from the groove 36 and permits the extraction side of the frame tool holder 20.

Suffice to laterally extract the frame tool holder 20 of the machine move simultaneously, or even one after the other, the two flexible rods 62 and 86 in the positions 62a and 86a and removing it against itself. This way to do simple and quick saves valuable time during the exchange of stripping tools.

As we mentioned earlier in the description, part toolholders lower ejection is performed in the same manner and also use a centering device and locking in three points. The construction being similar, it does not seem sensible to us described in more detail as the description on the frame upper tool carrier 20 can be easily be transposed to this achievement.

Figure 7 is a view on A of Figure 5 which shows how the framework toolholder 20 and the first locking member and Centering 59 are arranged with respect to the cradle top 6. For the understanding of this figure, Please refer to the reference signs used in the description of Figure 5.

Figure 8 is a view B of Figure 5 showing how the framework toolholder 20 and the guide member 30 are arranged in relative to the upper cradle 6 and how the body guide 30 is connected to the upper cradle by via a plate 102. For understanding of this figure, reference is also to the reference signs used in the description of Figure 5.

Figure 9 is a view C of Figure 6 which shows how the framework toolholder 20 and the second locking member and centering 84 are arranged relative to the cradle top 6. For the understanding of this figure, Please refer to the reference signs used in the description of Figure 6.

FIG 10 is a view on D in Figure 6 showing how the framework toolholder 20 and the guide member 30 are arranged in relative to the upper cradle 6 is made and how the support of the tool frame 20 in the cradle top 6 via the slide 85. For the understanding of this figure, see also to the reference signs used in the description of Figure 6.

Figure 11 is a side view of a profile centering and locking device 58 of a door-frame board ejector 40 in which mounted a perforated plate 41 and 12 is a view along XII-XII of Figure 11.

As shown in these figures and also Figure 4 described above, the framework ejection carrier board includes only one centering and locking device 58. The frame door-stripping board 40 is secured to the cradle mobile 54. A locking pin 104 is mounted on against a portion 106 fixed to a bracket 105 mobile cradle 54. In order to adjust the locking position of the holding frame board ejector 40, the locking pin 104 has a threaded rod 107 engaging in a bore of the against portion 106. The position of the locking pin 104 can be adjusted by acting on the nuts 108 of the threaded rod 107 (see also Figure 12). the stud Lock 104 comprises a bore 109 in which engages the cylindrical portion of the latch 110. The bolt 110 is mounted, so as to sliding in a socket 111 driven into a support 112 secured to the frame carrier board 40. The ejection bore which receives the socket 111 stopped at one of its ends against which builds a 113 also guided in a spring bore 114 formed in the upper end of latch 110. The latch 110 is further provided with a stem control 115, the cylindrical portion 116 engages in a bayonet 117 machined in the carrier 112. The control rod 115 is further provided a handle 118 by means of which it is possible, against the action of spring 113, moving from a position locked, shown in Figure 12, at a position unlocked 119 shown in dashed lines in 11.