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
  • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
  • B23Q1/25—Movable or adjustable work or tool supports
  • B23Q1/44—Movable or adjustable work or tool supports using particular mechanisms
  • B23Q1/50—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism
  • B23Q1/54—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism two rotating pairs only
  • B23Q1/5468—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism two rotating pairs only a single rotating pair followed parallelly by a single rotating pair
• • 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
  • B23Q27/00—Geometrical mechanisms for the production of work of particular shapes, not fully provided for in another subclass
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
  • B26D3/10—Making cuts of other than simple rectilinear form
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
  • B26F3/00—Severing by means other than cutting; Apparatus therefor
  • B26F3/004—Severing by means other than cutting; Apparatus therefor by means of a fluid jet

Definitions

• the invention relates to an apparatus and method for cutting separate plasters from a web of plaster material.
• a web of plaster material is composed of an adhesive basic sheet provided with perforations, a series of wound pads stuck thereon and two removable protection or cover strips which overlap in the middle of the web.
• the basic sheet may be made of PE, PVC or PP and the protection strips may be made of for instance silicone paper.
• sepa ⁇ rate plasters are cut from the web of plaster material by means of a punch, which is shaped like a separate plaster and is reciprocated in vertical direction. With this punch the web of plaster material is each time cut along one straight line, transverse to the main direction of the web of plaster material and along two opposed curved lines extending substantially parallel to the principle direc ⁇ tion of the web of plaster material.
• the straight line always forms the rearmost longitudinal side of a preceding plaster and the foremost longitudinal side of the subse ⁇ quent plaster which immediately follows it.
• the plasters which are thus cut out of the web of plaster material are immediately after that removed in transverse direction and the remaining material of the web is cut to pieces down ⁇ stream of the punch.
• the cutting means comprise a cutting tool which is reciprocable in vertical direction, said cutting tool being provided with an H-shaped cutting blade, with which a portion of the end edges of a preceding plaster, the edge, which forms the boundary between the preceding and the subsequent plaster, and a portion of the end edges of the subsequent plaster are cut.
• US patent specification 3,900,027 shows an apparatus for producing separate, right-angled plasters, comprising cutting means, consisting of a pair of rolls arranged above and below the web of plaster material and transverse thereto, of which rolls the top one is provided with a series of circular blades for cutting the web in longitu ⁇ dinal direction and of a pair of blade-cylinders arranged downstreams thereof, transverse to that web above and below the web of plaster material, for cutting the web in longitudinal direction.
• Known are furthermore apparatuses for producing separate plasters from a web of plaster material wherein by means of cylinders having blades oriented perpendicularly to the web of plaster material, the web of plaster material is cut into separate pieces having the width of the plasters to be obtained, after the curved end edges of the plasters (to be cut thereafter) have been cut by means of two rolls provided with curved blades and arranged above the edges of the web.
• All apparatuses mentioned above use cutting parts, which are active when in contact with the web of plaster mate ⁇ rial and are therefore likely to be subject to wear and tear. As a consequence thereof, the cutting members will regularly need to be replaced, possibly even during a production period. This holds true especially for curved blades.
• the invention provides an apparatus for cutting wound plasters from a web of plaster material, comprising a conveyor for support and motion of the web of plaster material, first cutting means for cutting the web in transverse direction in order to form the longitudinal edges of the plasters, and second cutting means for cut- ting the web substantially in longitudinal direction in order to form the end edges of the plasters, wherein the second cutting means are. arranged at a distance from and above the side edges of the web of plaster material and comprise means for delivering a jet which cuts through the web, as well as comprising motion means for moving the jet delivery means in a cyclical manner, according to a path which coincides entirely with the web of plaster material.
• the functioning of the cutting means will deteriorate less rapidly with the passage of time than those of blades, which will after all have to be replaced as a result of wear and tear, or the functioning will not deteriorate at all.
• the net feasible production time of the apparatus for producing separate plasters is hereby increased.
• the cutting means are herein constantly being utilized, so that an optimum efficiency of the apparatus is obtained and no special means are necessary for intermittently activating and deactivating the jet delivery means and so that the energy of the jet delivery means can be utilized to a maximum. If the jet delivery means are designed to deliver a cutting water jet, no additional provisions need to be made for intercepting a water jet moving outside the web of plaster material.
• the motion means are designed for reciprocating the jet delivery means in transverse direction. This also meets a condition for a further advantageous development of the apparatus according to the invention to be discussed below.
• the motion means are preferably also designed for recipro ⁇ cating the jet delivery means in longitudinal direction of the web.
• the motion means for the jet delivery means are therein preferably adapted for moving the jet delivery means along a round- going, closed path, which closed path is preferably cir ⁇ cular, from the point of view of simplicity of the con ⁇ struction.
• the apparatuses for producing separate plasters are therefore preferable designed so that they can be adjusted for producing plasters of dif ⁇ ferent dimensions.
• the apparatus comprises means for adjusting the speed of movement of the web of plaster material relative to the speed of movement of the jet delivery means.
• the speed of the web and/ or adjusting the reciprocating speed of the jet delivery means By adjusting the speed of the web and/ or adjusting the reciprocating speed of the jet delivery means, the dimension of the cords of the end edge of the plaster extending in longi ⁇ tudinal direction of the web may be set as desired.
• the acutal cutting means need not be replaced, so that the manufacturing process is not slowed down because of it.
• two second cutting means are arranged, one above each edge area. Because the appa ⁇ ratus according to the invention is designed such that the complete path covered by the jet delivery means is situa ⁇ ted above the web or web edge, it is possible to cut a wide web of plaster material into several series of plas ⁇ ters positioned side by side, for which purpose several pairs of second cutting means are then arranged side by side in transverse direction.
• the apparatus preferably comprises means for adjusting the mutual distance between the jet delivery means of the second cutting means in transverse direction of the web of plaster material.
• jet delivery means are herein arranged on first outer ends of holders for jet delivery means, which are arranged horizontally pivotably and are, with their opposite, second outer ends, in engagement with displacement means for those second outer ends, said displacement means being adjustable for horizontally oppo- site displacement of both second outer ends in order to adjust the mutual distance of the jet delivery means.
• the second outer ends are herein preferably provided with cams which each engage in driven cam tracks, provided on a cylindrical body in an opposite manner with a horizontal directional component, which cylindrical body is rotatably incorporated, preferably in an oscillating manner, in the apparatus.
• the apparatus according to the invention thus comprises simple means for setting/adjusting the length of the cut plasters, without parts needing to be replaced for that purpose. Adjusting the distance between the jet delivery means can be done quickly, so that the switch to another plaster length consequently does not lead to appreciable loss of production (time) .
• a pre ⁇ ferred embodiment of the apparatus according to the inven ⁇ tion is executed in a manner in which the jet delivery means are borne for rotation in a first holder around a first vertical axis, which holder is itself borne in the apparatus for rotation around itself, around a second vertical axis which is parallel to and spaced from the first vertical axis, the motion means comprising means for rotating the first holder.
• the first holder is herein preferably formed by a sleeve, provided with driving means which are concentrical with the second vertical axis and are suitable for engagement by the motion means, and further provided with receiving spaces for bearing means for the jet delivery means, which receiving spaces are borne concentrically relative to the first vertical axis and excentrically relative to the second vertical axis.
• the moment of inertia is herein kept minimal, so that little energy is required in order to let the jet delivery means rotate and moreover less stiff demands need to be made of the bearing of the jet delivery means and the motions means for the latter.
• the apparatus can be kept very compact, thus allowing in particular the arrangement of several pairs of jet delivery means next to each other.
• figure 1 a schematic view of an apparatus for producing separate plasters from a web of plaster material, in which the cutting direction according to the invention may be incorporated:
• figure 2 the cutting apparatus according to the inven- tion, seen in view in the direction of transport of the web of plaster material;
• figure 3 a top view III-III on the cutting apparatus of figure 2 ;
• figure 4 a vertical cross section along IV-IV in figure 2;
• figure 5 a vertical cross section of a part of the cut- ting apparatus of figure 2;
• figure 6 a top view on the part of figure 5;
• FIGS 7A-C some examples of the shape in which the edges of the web of plaster material may be cut by means of the cutting apparatus according to the invention.
• the web of plaster in supported where necessary.
• FIG. 1 shows a schematical arrangement of an apparatus 100 with which separate plasters may be produced out of a plaster web.
• the apparatus 100 comprises a station 1, in which a roll 101 and a spare roll 101' of plaster web A and two rolls 102 and two spare rolls 102' of webs of cold-seal paper C are mounted.
• station 1 various retur- ning and guiding rollers are also arranged to guide the webs A and C during unwinding of the rolls concerned.
• the plaster web A is built up of three layers, namely a layer of film, a self-adhesive glue layer and a layer of silicone paper.
• the plaster web is manufactured in a conventional manner and is somewhat wider than the length of the plasters which are to be made.
• the plaster web A is led towards to the right to a station 2 , where the silicone paper of the plaster web is cut along the length of the web and unfolded.
• a web B which is supplied from a supply 103
• Station 4 here comprises three cutting means 4', 4'', 4''' having different dimensions, so that there is a choice here regarding the width of the plas ⁇ ters.
• the station 4 further comprises a passage 4a for the plaster web A*.
• Station 5 is situated downstream of the station 4. By means of station 5 the web cut in station 4 is conveyed to station 9, where the plaster web A* is cut in longitudinal direction by means of the cutting appa ⁇ ratus according to the invention, and the rounded sides of the plaster are formed.
• the plasters are packaged in station 6 by means of the webs of cold- seal paper C supplied from above and below and subsequent ⁇ ly the packagings are cut loose in station 7.
• the plasters are packed in groups.
• the plaster web is supported in several places, where necessary, such as at the location of the stations where cutting takes place, for instance by means of conveyor belts.
• a Z-shaped support 10, 11, 12 is represented, fastened at its base plate 11 to the frame 60 of the apparatus 1 by means of bolt 61.
• a direct current motor 13 is fastened to the vertical plate 10 by means of bolts 29, which direct current motor 13 is controllable and takes care of rotation of the axis 14, on the upper end of which a gear belt pulley 15 is fastened.
• An endless geared belt 16 is led around the gear disc 15, which endless geared belt runs around a gear belt pulley 17 on the left-hand end.
• the gear belt pulley 17 is fixedly secured to a gear 19a, of which the teeth 32a engage teeth 32b of a gear 19b arranged next to it.
• the teeth 32a of gear 19a mesh with the teeth 33a of a gear 66a of a first jet cutter 55a, while the teeth 32b of the gear 19b mesh with the teeth 33b of a gear 66b of a second jet cutter 55b.
• the gears 19a, 19b are further supported in a rotatable manner on the support plate 12.
• holders 22a, 22b are situated, which holders will be discussed in more detail later, and which are connected in a swivelling manner to the plate 12.
• Water pipes 25a, 25b are incorporated in a rotatable manner in the holders 22a, 22b. These water pipes 25a, 25b have nozzles 68a, 68b on their lower end and are connected on their upper end to water supply pipes 21a, 21b by means of connecting pieces 20a, 20b, which water supply pipes supply water from a source of pressurized water.
• Figure 2 also shows the cam track 26, provided with two cam tracks 27a, 27b extending obliquely towards each other over half a circumference. If desired, the cam track roller 26 can be turned over half a revolution by means of rotation air cylinder 28.
• the cam tracks 27a, 27b are meshed with follow pins 31a, 31b respectively, which are respectively provided on the outer ends of arms 30a, 30b, which form a whole with the aforementioned holders 22a, 22b.
• Figure 4 clarifies the apparatus of the jet cutter 55a in more detail in cross section. Going from right to left, the pin 31a can be seen, which is accommodated in the cam track 27a of the cam track roller 26, which is driven by the rotating air cylinder 28.
• the rotating air cylinder 28 is secured to the support plate 12 by means of bolts 56a.
• the pin 31a is fastened to the outer end of the arm 30a, which extends towards the right from the holder 22a and forms a whole therewith.
• a bore 57a is arranged in the holder 22a, in which bore a pin 37a, fixedly connected to the support plate 12, projects.
• An upper groove ball bear ⁇ ing 46a and a lower groove ball bearing 46a, as well as a radial ball bearing 47a allow for rotation of the holder 22a relative to 37a.
• the pin 37a extends upwards, out of the bore 57a, through bore 58a in the support plate 12 and then merges into a flange 59, secured to the ground plate 12 by means of bolt 62a.
• the pin 37a is thus fixedly secured to the ground plate 12.
• the pin 37a is accommodated in a bore 63a in the gear 19a, and rotatably borne therein by means of the upper and lower groove ball bearings 46a.
• the holder 22a is provided with a bore 64a, in which the sleeve 36a is accommodated in a rotatable manner, by means of upper and lower groove ball bearings 46a.
• the sleeve 36a On its lower end, the sleeve 36a is provided with a rotatably arranged counterweight 23a, which serves to be able to balance the apparatus.
• the sleeve 36a On its upper end, the sleeve 36a is provided with a flange 48a, which is provided with a flange 48a, which is provided with slotted holes 49a, through which bolts 65a project for fastening of a gear 66a thereto.
• the slotted hols 49a render it possible to accurately set the position of the gear 66a, especially relative to the other gear (66b) , to align the cords, which are cut out by both pertaining cutting jets, relative to each other.
• the gear 66a is provided with the teeth 33a, which mesh with teeth 32a of the gear 19a.
• a pipe 24a is accommodated in an excentrical manner within the sleeve 36a, which forms a bore 52a, said pipe being borne and supported in a rotat ⁇ able manner within the sleeve 36a, on the upper end by means of groove ball bearing 46a and on the lower end by means of radial ball bearing 47a and the groove ball bearing 46a.
• the pipe 24a is furthermore rendered clear- ance-free on its upper end relative to the sleeve 36a by means of adjusting ring 40a and adjusting bolt 41a.
• the upward forces on the pipe 24a as a result of the jet delivery of the jet cutter are absorbed by the adjusting ring 40a and the radial ball bearing 47a.
• a ring 42a is fastened to the lower end of the pipe 24a by means of bolts that are not shown.
• An arm 44a projects from this ring 42a, on the outer end of which a pin 45a is fastened, which is in its turn secured in the holder 22a.
• the pipe 24a is provided with a bore 67a, in which the jet deliverer 25a is accommodated.
• the water pipe 25a is fixed in vertical direction by means of bolt 43a.
• this jet deliverer 25a is provided at its lower end with a nozzle 68a and is supported at the location of its upper end on the upper end of the pipe 24a by means of adjusting ring 38a and fastening bolt 39a in a manner in which it is clearance-free in vertical direc ⁇ tion.
• the height of the water pipe 25a can be set with the adjusting ring 38a.
• the jet deliverer 25a is coupled to the water supply pipe 21a by means of coupling 20a.
• the sleeve 36a has been represented in a larger size, wherein it can be clearly seen that the centre line Y-Y of the bore 52a does not coincide with the centre line X-X of the bore 50a in the upper portion of the sleeve 36a and of the bore 51a in the lower part of the sleeve 36a.
• the centre line Y-Y of the bore 52a does coincide with the centre line of the flange 48 and there ⁇ fore of the gear 66a.
• the centre line X-X of the bores 50a, 51a coincides with the centre line fo the pipe 24a and of the jet deliverer 25a, when these are in the moun ⁇ ted position represented in figure 4.
• gear 19b is rotated in the direction of R.
• the rotational speed of those will be similar. Due to the meshing of the teeth 33a of gear 66a with the teeth 32a, the gear 66a is simultaneously rotated in the direction S. Due to the meshing of the teeth 33b of gear 66b with the teeth 32b of gear 19b, the gear 36a is simultaneously rotated in the direction T. Because the gears 66a and 66b have a similar diameter, the rotational speed of both is the same.
• the jet deli ⁇ verer 25a Because the jet deli ⁇ verer 25a is mounted freely but rotatably, the jet deli ⁇ verer 25a will be able to maintain its rotary position relative to the holder 22a so that, also because of the limitation of the rotatability of the pipe 24a relative to the fixed parts of the cutting apparatus provided by the parts 42a, 44a and 45a, torsion of the water supply pipe 21a is prevented. So, when in operation, the jet deliverer 25a delivers a water jet with its nozzle 68a, which water jet makes a circular rotating movement relative to a web of plaster material A* moving below it (see figure 3) . A similar story holds true for the jet deliverer 68b.
• the jet which is delivered from the nozzle 68a and 68b can have a diameter of 0.1 mm and can be delivered under a pressure of 3000 bar. It has been found that such a water jet is sufficient for cleanly cutting a web of plaster material.
• the arrangement of the sleeve 36a, in which it is rotat ⁇ able around itself and about axis Y-Y, in which sleeve the jet is incorporated, ensures that the forces due to of rotation are kept low, while moreover the occupation of space is slight.
• High revolution frequencies are herein easily feasible, for instance of minimally 3000 p/min.
• the pattern can be influenced by for instance leaving the speed of the uniform motion of the rotating jet deliverers unchanged and changing the translatory speed of the web in order to obtain more or less wide plasters.
• a similar result may be obtained by altering the rotational speed of the jet deliverers with unchanged translatory speed of the web.
• FIGS. 7A, 7B and 7C Examples hereof are shown in figures 7A, 7B and 7C. In all these figures, the web of plaster material A* is shown, moving in the direction E with a translatory speed of V b .
• the jet deliverer is arranged above the edge of the web and traces a circle with a radius of 2 mm on a revolu- tional speed V w , rotating counter-clockwise.
• Figure 7A shows the path of the point of intersection of the water jet on the plaster web, when V b is smaller than V w .
• Figure 7B once again shows the path of the point of intersection of the water jet on the web of plaster material, but now in the case in which V b is equal to V w .
• This path is pre ⁇ ferred because herewith the end edges of the plasters, here having a width b, are cut in such a way that at the location of the boundaries between the plasters a sharp transition is realized.
• the cutting apparatus discussed above can be adapted to the plaster length or, in other words, the width of the plaster web.
• the turning cylinder 28 is operated, whereby the cam track cylinder 26 will be rotat ⁇ ed as much as desired, but at most over half a revolution.
• the position of the cam tracks 27a, 27b relative to the pins 31a, 31b accommodated therein will also change.
• the arms 30a and 30b seen for instance in the top view of figure 3, will swing in the horizontal plane.
• the entire machine will be provided with a control system. Therein the motor of the (water)cutting apparatus will serve as master, the other processing stations will follow this motor with established ratios.
• the software program of the control system will ensure that the different dimensions of plasters can be made.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Physics & Mathematics (AREA)
• Geometry (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19861685

Family Applications (1)

Country Status (3)

Cited By (7)

Citations (5)

• 1992
  • 1992-12-24 NL NL9202257A patent/NL9202257A/nl not_active Application Discontinuation
• 1993
  • 1993-12-23 AU AU58433/94A patent/AU5843394A/en not_active Abandoned
  • 1993-12-23 WO PCT/NL1993/000274 patent/WO1994014584A1/en active Application Filing

Patent Citations (5)

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