Classifications

• • 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
  • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
  • B26D1/56—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter
  • B26D1/60—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is mounted on a movable carriage
  • B26D1/605—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is mounted on a movable carriage for thin material, e.g. for sheets, strips or the like
• • 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
  • 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
  • B26D3/14—Forming notches in marginal portion of work by cutting
• • 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
  • B26D9/00—Cutting apparatus combined with punching or perforating apparatus or with dissimilar cutting apparatus
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
  • B65H35/04—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with transverse cutters or perforators
  • B65H35/06—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with transverse cutters or perforators from or with blade, e.g. shear-blade, cutters or perforators

Definitions

• the invention relates to a cutting device and rounded corners for a strip material for a strip material intended to be cut in the form of substantially rectangular sheets having rounded corners and relates in particular to the cutting of radiographic products.
• such rounded corners are produced by first making notches, having the shape of the rounding common to two adjacent sheets, on the edges of a moving strip and, then, cutting the strip in the middle of said notch.
• the problem with such a technique lies in the difficulty of correctly positioning the cutting device relative to the center of the notch. Indeed, the slightest defect in positioning of the cutting device will cause an incomplete rounding of one of the sheets and an undesirable strip at the end of the other sheet.
• Another known technique involves stopping the process while positioning and making the rounded corners of the sheet which has just been cut. This technique is of course penalizing from the point of view of productivity.
• the strip is cut into sheets; a given number of sheets is then stacked and the stack of sheets is then moved to equipment intended to produce the rounded corners.
• a technique presents problems which may result from incorrect stacking of the sheets in the stack.
• other systems such as in-line rotary systems, but which have large problems related to the complexity of the operations necessary for the passage from one format to another.
• a cutting device and rounded corners are produced for a strip material intended to be cut in the form of substantially parallelepipedic sheets having rounded corners, said device mainly comprising: a) means for feeding and guiding the strip material, b) means for evacuating, guiding and receiving individual sheets with rounded corners, c) cutting means comprising a knife and a counter knife and means making it possible to produce the rounded corners comprising two punch modules / matrix arranged opposite each other on both sides of the strip, said means making the cut and the rounded corners being driven by means of two double eccentrics, the first double eccentric driving the knife by means of a first eccentric and, integrally, the two punches (or the two dies) by means of a second eccentric, the first and the second eccentric being in phase opposition, the second double eccentric driving the counter knife through a third eccentric and, in a solid manner, the two dies (or two punches) via a fourth eccentric, the third and
• FIG. 1 schematically represents an embodiment of the cutting device and rounded corners according to the present invention
• FIGS. 3A-3B represent a coupling device with variable angular speed, as used in a particular embodiment of the device according to the present invention
• Figs 4A-4B show curves illustrating the operation of the variable angular speed coupling device shown in Figs 3A and 3B;
• Fig. 5 shows an example of a differential movement device as used in a preferred embodiment of the cutting device and rounded corners according to the present invention.
• Fig. 1 to which reference is now made illustrates an embodiment of the cutting device / rounded corners according to the present invention.
• the device mainly comprises a roll 1 of the strip product which it is desired to cut into sheets having rounded corners. It may be an example of an X-ray product.
• the feed device comprises drive means, guide devices which, in order to simplify the drawing, are not shown in FIG. 1.
• the device also comprises a cutting device comprising a knife 2 and a counter knife 3 and a device making it possible to produce rounded corners comprising two punch / die modules 4.5 facing each other (one of each side of the strip).
• the first double eccentric drives the block carrying the knife 2 and, in an integral manner, the two punch-carrying blocks 4 (or the two die-carrying blocks 5), the first and the second eccentric being, as shown in FIG. 1, in phase opposition.
• the second double eccentric 7 drives the block carrying the counter knife 3 and, in an integral manner, the two die-carrying blocks 5 (or the two punch-carrying blocks 4), the third and the fourth eccentric also being, as shown in Fig. ___. , in phase opposition.
• the two double eccentrics are arranged so that the knife and the punches come to cooperate respectively with the counter-knife and the dies, in a manner well known in the art.
• Each of the motor shafts is driven at constant speed (by example 300 rpm) or, according to a preferred embodiment, by means of a device with variable angular speed which will be discussed in more detail below and which makes it possible to communicate to the cutting tools and rounded corners an equal speed at the speed of the film during the entire period of engagement of said tools and said film.
• the two motor shafts 8, 9 are, by suitable gear devices, driven by the same motor. Such an arrangement makes it possible to facilitate the synchronization of the movement of the two double eccentrics.
• the different tools thus mounted each describe, according to a well-defined chronology, a circular trajectory in a plane parallel to the axis of travel of the film and orthogonal to the plane of this film.
• the circular paths 10, 11, 12, 13 of the different tools are shown in broken lines in FIG. 1.
• the synchronization of the respective movements of each of the tools will now be the subject of a more detailed description with reference to FIGS 2A-2D.
• Fig. 2A the knife 20 and the counter knife 21 are in the cutting position and are each facing one another on their respective circular paths.
• the punch holder blocks 22 and the die holder blocks 23 are in turn opposite each other respectively on their respective circular paths.
• Fig. 2B after a 90 ° rotation of each of the double eccentrics, the device passes through a first intermediate position in which the knife 20 and the punch holder blocks 22 are opposite on their respective circular paths. It is the same for the counter knife 21 and the die holder blocks 23.
• FIG. 2C after a further 90 ° rotation of each of the double eccentrics, the situation is the reverse of the situation relating to FIG. 2A.
• the punches 22 and the dies 23 are in the engagement position on the film and are each in look respectively at each other on their respective circular paths.
• the knife 20 and the counter knife 21 are in contrast to each other on their respective paths.
• Fig. 2D after a further 90 ° rotation of each of the double eccentrics, the device passes through a second intermediate position in which the knife 20 and the punch-carrying blocks 22 are opposite on their respective circular paths. The same goes for the counter-knife 21 and the die-carrying blocks 23.
• the device is in the position shown in FIG.
• the punch holder blocks and the die holder blocks are in engagement with the film, thus achieving the rounded corners of both the upstream edge of the sheet F n + 1 and from the downstream edge of the "sheet" F n , a device with differential movement, which will be described in more detail below, being provided in the device for conveying the sheets so that the sheet F n + 1 , during the time interval corresponding to the 180 ° rotation of the double eccentrics, a distance slightly greater than the distance traveled by the "sheet" F n still attached to the roll of product in strip. According to one embodiment, this variation in distance is of the order of 2 mm. After a further 180 ° rotation of each of the double eccentrics, the sheet F n is separated from the "sheet" F n _ 1 and so on.
• Means for evacuating, guiding and receiving the individual sheets are provided at the outlet of the device according to the present invention.
• the presence of the device making the rounded corners immediately next to the cutting device makes it possible to make the rounded corners of the downstream edge of the sheet F n while the latter is still integral with the roll of product in a strip, thus avoiding positioning problems.
• the corners of the other edge of the sheet are made immediately after the sheet has been separated from the rest of the roll, thereby minimizing the risk of the sheet being misaligned with respect to said punches.
• Such a system is perfectly modular both in width and in length, the length changes being effected by delaying or accelerating in an appropriate manner the movement of the double eccentrics, the width changes being effected by moving one of the modules laterally. punch / die.
• Fig. 5 shows a differential movement device which can be used, according to a preferred embodiment, to separate the sheet which has just been cut from the rest of the roll of strip material.
• the device mainly comprises a motor shaft rotating at constant speed V.
• This motor shaft is coupled by means of a belt and a set of pulleys to a second shaft 31 suitable for driving the sheet F n which has just been separated of the roll of product in a strip, the two central pulleys 32, 33 coupled together, being slaved, for example, to the movement of the knife, so that said central pulleys have a reciprocating movement (shown vertically in FIG 5) allowing, during the time interval when the knife rises to the top of its circular trajectory, to increase the speed of the shaft 31 and therefore to accelerate the movement of the sheet F n which has just been separated from the roll of strip material.
• Figs 3A-3B to which reference is now made represent a variable angular speed coupling device as used in a preferred embodiment of the device according to the present invention.
• This speed coupling device mainly comprises:
• the leaf spring 46 has a slightly convex shape (this characteristic does not appear in FIG. 3).
• Such an arrangement allows the cams to perfectly follow said stationary cams and therefore allows greater precision in the movement at variable angular speed, - an output arm 47 coupled to this cam / cam mechanism; each end of the output arm 47 is connected by a spring leaf 48, 49 respectively to one of the two said cam follower supports 44, 45, so that the rotational movement, induced by the stationary cams, of each cam follower support around the axis of articulation of each pair of crossed springs causes a proportional rotational movement of the output arm 47 relative to the input arm 41.
• the output arm 47 at a speed which, as shown in FIG. 4B oscillates around the value of the speed of the input arm 41.
• the output arm is according to a particular embodiment connected to the control shaft of the cutting device / rounded corners by means of a flexible, rigid coupling in torsion (in order to solve the problems linked to a bad alignment between the axis of the output arm and the control axis of the cutting device / rounded corners).
• a flexible, rigid coupling in torsion in order to solve the problems linked to a bad alignment between the axis of the output arm and the control axis of the cutting device / rounded corners.
• the maximum speed variations between the output arm (curve in solid lines) and the nominal speed of the input arm (abscissa axis) are in the illustrated embodiment of ⁇ 7%.
• this difference in speed modifies the linear speed of the cutting tools / rounded corners so that it corresponds perfectly, over an engagement angle of approximately 50 ° of the tool, to the speed of a strip moving at constant speed, the curve in broken lines representing the speed of the input arm; the curve in solid lines represents the speed of the output arm, substantially constant over approximately 50 °.
• the use of such a device makes it possible to increase the engagement time of the cutting tools / rounded corners.

Landscapes

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

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9410078

Family Applications (1)

Country Status (7)

Citations (3)

Family Cites Families (2)

• 1991
  • 1991-02-20 FR FR9102242A patent/FR2672839A1/fr active Pending
• 1992
  • 1992-02-12 EP EP92906750A patent/EP0572516B1/de not_active Expired - Lifetime
  • 1992-02-12 JP JP4506379A patent/JP2619191B2/ja not_active Expired - Lifetime
  • 1992-02-12 EP EP96420238A patent/EP0740985A3/de not_active Withdrawn
  • 1992-02-12 DE DE69219462T patent/DE69219462T2/de not_active Expired - Fee Related
  • 1992-02-12 WO PCT/FR1992/000125 patent/WO1992014588A1/fr active IP Right Grant
  • 1992-02-12 BR BR9205650A patent/BR9205650A/pt not_active Application Discontinuation
  • 1992-02-19 MX MX9200696A patent/MX9200696A/es not_active IP Right Cessation

Patent Citations (3)

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