EP1256424A2 - Apparatus for cutting flexible material - Google Patents

Abstract

The cutter (1) incorporates a clamp (5) which has two arms (51,52) which can swivel in relation to each other on one plane. The clamp arms exert pressure on the goods being cut up in a decreasing extent in the direction of cutting. the two clamp arms form two facing sides of a deformable rectangle whose sides (51-54) are linked in pairs in the corners (55-58).

Description

The present invention relates to a cutting device of in particular flexible material to be cut, for example Insulation plates, in particular made of fiber material, according to Preamble of the first claim.

The document CH-685'433 describes one of these Cutter. This consists of a base bar with a Bearing block in which a swiveling guide ruler is held is. There is a between two rails of the guide ruler Knife movably guided. This can be done using a Rope, which through a deflection point on the guide ruler is passed through. When cutting it will Insulation material between the one supported on the ground Basebar and the guide ruler clamped. This The cutting device has the disadvantages that the relatively soft, flexible insulation material not optimal when cutting is held and that the knife is not direct, but is moved by means of a rope.

The document EP-0'497'078 A1 discloses a cutting tool for such a cutter.

From the document EP-0'931'632 A1 is a cutting device for Cutting thermal insulation boards known. With this Cutting device is the thermal insulation board to be cut between two opposite arms of a lever parallelogram trapped. The thermal insulation board comes with a saw cut, which in two on this side and beyond the Thermal insulation plate arranged guide gaps is guided, where the thickness of the cutting edge and the width of the Leadership gap are coordinated.

The cutting device disclosed in EP-0'931'632 A1 is for Rigid, inflexible thermal insulation boards designed and for that too well suited. On the other hand, difficulties arise when thus a flexible plate or a flexible one, in webs Rollable flat material such as rock wool cut shall be. First, saws are not made for such materials optimal because they generate dust which from the Operator is inhaled and their health endangered. Better non-cutting tools like Knife. Secondly, the bracket turns out to be too cutting material as insufficient by the Material due to its flexibility in applying pressure its longitudinal edge deforms and evades the pressure. The latter However, the disadvantage becomes particularly severe when trying simply replace the saw with a knife. While As is well known, sawing forces perpendicular to the cutting process play an important role when cutting with a Knife practically exclusively the force parallel to the The shape of the cut is decisive and particularly large.

It is therefore an object of the invention that in EP-0'931'632 A1 disclosed to further develop the cutting device in such a way that so that flexible materials can be cut. The Task is solved by the cutter, as in the first Claim is defined.

The device according to the invention for cutting in particular flexible cutting material includes a clamping device for the Material to be cut, which has two clamping arms and means for pivoting which includes clamping arms relative to one another in one plane. The Swivel means are designed such that the mutual Position of the clamping arms in every swivel position defined and a distance between the clamping arms is variable when swiveling. The clamping device is designed such that the Clamp arms on the material to be cut in the cutting direction apply decreasing clamping pressure, d. H. the distance of the Clamping arms increase in the cutting direction, for example downwards. As a result, the clamping pressure acting on the material to be cut is at the top, d. H. at the point where the cutting tool is in the material to be cut penetrates the largest and decreases in the cutting direction. On Slipping or evasion of the material to be cut in particular when the cutting tool penetrates critically Cutting material is prevented in this way. This attribute completely differentiates the clamping device according to the invention essentially from the teaching of the document EP-0'931'632 A1, where a expressly a parallelogram for clamping the material to be cut is used, so the clamp arms by definition in everyone Swivel position are parallel to one another and local Apply constant clamping pressure to the material to be cut.

In a preferred embodiment, the two form Clamp arms two opposite sides of a deformable one Rectangles, the sides of which are articulated in pairs in the corners are connected. The clamp arms are in almost all Swivel positions not parallel to each other. (This is so too understand that there are probably a finite set of positions may give in which parallelism exists, but that in the there is no parallelism in other positions.) The cutting device according to the invention preferably also includes a cutting tool and a guide device for the Cutting tool, cutting tool and Guide device are coordinated.

A preferred embodiment of the invention will explained in detail below with reference to the drawings.

Fig. 1

das erfindungsgemässe Schneidgerät in einer perspektivischen Ansicht;

Fig. 2

das erfindungsgemässe Schneidgerät in einer Seitenansicht;

Fig. 3

das erfindungsgemässe Schneidgerät in einer Frontalansicht; und

Fig. 4

einen Teil des erfindungsgemässen Schneidgerätes, nämlich das Schneidwerkzeug und seine Führungseinrichtung, in einem Querschnitt.

Show:

Fig. 1

the cutting device according to the invention in a perspective view;

Fig. 2

the cutting device according to the invention in a side view;

Fig. 3

the cutting device according to the invention in a frontal view; and

Fig. 4

a part of the cutting device according to the invention, namely the cutting tool and its guide device, in a cross section.

A preferred embodiment of a cutting device 1 according to the invention is shown in FIG. 1 in a perspective view, in FIG. 2 in a side view and in FIG. 3 in a frontal view. The cutting device 1 contains a support column 11, which can be placed on a stand 21, for example a bipod, on a base 91. As a third support point, a support 22 is provided at the upper end of the support column 11, with which the cutting device 1 can be leaned against a wall 92. Alternatively, the cutting device 1 could also be set up free-standing, for example on a tripod.

The support column 11 carries the essential elements of the Cutting device 1. For guiding (in Fig. 1 not shown) to be cut 8 has this Cutting device 1 a horizontal, in the longitudinal direction y arranged guide stop 12 on. This also includes Cutting device 1 arranged on both sides of the support column 11 horizontal, preferably pivotable support arms 13, 14 for Support of the material to be cut 8. At the guide stop 12, a (for simplicity's sake only shown in Fig. 1) horizontal first approach 15 with a guide 16 to Miter cutting. On the same side the guide stop 14 could also be a larger one (not drawn) second approach in the form of a table for Parking of insulation material rolls.

The cutting device 1 has a cutting device 8 for cutting Cutting tool 3, for example a knife with a handle 31 and a blade 32 on. The knife 3 is in one Guide device 4 guided, which two guide gaps 41, 42 includes. There is a first guide gap 41 this side of the insulation material 8 and is by a Rod pair 41.1, 41.2 formed. A second guide gap 42 is located beyond the insulation material 8 in the Support column 11, which also contain a pair of rods 42.1, 42.2 can. The guide device 4 is described below of Figure 4 received in detail.

Furthermore, the cutting device 1 according to the invention includes a Clamping device 5 for clamping the Insulation material 8. In this embodiment, the Clamping device 5 essentially as a deformable square with rigid sides 51-54, which in pairs in the corners 55-58 are articulated, trained. The rectangle is there on the one hand from two longer, opposite sides 51, 52, which as a movable clamping arm 51 or as a fixed Clamp arm 52 are used, and on the other hand, from two shorter, opposite sides 53, 54, which for Swing the movable clamp arm 51 serve. When panning a distance of the movable clamp arm 51 changes between the two clamping arms 51, 52. The fixed clamping arm 52 can coincide, for example, with part of the support column 11; he forms a base for the material to be cut 8 and at the same time also a guide for the cutting tool 3.

According to the invention, the lengths of the square sides 51-54 are selected such that the two clamping arms 51, 52 move in one plane, but are not parallel to one another in almost all swivel positions. The distance between the clamping arms 51, 52 preferably increases in the cutting direction, ie downwards in this exemplary embodiment. As a result, the clamping pressure p ₁ acting on the material to be cut 8 is at its top, ie at the point where the cutting tool 3 penetrates the material to be cut 8, and decreases in the cutting direction. Thus p ₁ > p ₂ applies, where p _{2 is} a clamping pressure which is exerted further down in the cutting direction than p ₁ (see FIG. 2). Slipping or evasion of the material to be cut 8, in particular when the cutting tool 3 critically penetrates the material to be cut 8, is thus prevented.

(a) β≈(b-c)/a für den Fall, dass die Schwenkarme 53, 54 ungefähr rechtwinklig zum festen Klemmarm 52 stehen (maximaler Abstand zwischen den Klemmarmen 51, 52), und

(b) β≈ (b 2-c 2)/[a(a-c)] für den Fall, dass der kürzere Schwenkarm 53 parallel am festen Klemmarm 52 anliegt (minimaler Abstand zwischen den Klemmarmen 51, 52).

In a specific exemplary embodiment, the two clamping arms 51, 52 can be of only slightly different lengths and have a length of, for example, 144 cm or 146 cm. The two swivel arms 53, 54 are preferably adjustable in length so that they can be adapted to the respective cut material 8, that is to say its thickness, nature, flexibility, etc., with respect to the distance between the clamping arms 51, 52 and clamping angle β. For length adjustment, the swivel arms 53, 54 can, for example, each have a guide 63, 64 for one of the articulated connections, which results in an articulated guide at the corresponding corners 55, 57. The swivel arm length b or c can be, for example, between 5 cm and 30 cm. If a denotes the mean length of a clamping arm and b or c the lengths of the swivel arms, the clamping angle β between the two clamping arms 51, 52 (cf. FIG. 2) is approximately calculated using the following formulas:

(a) β≈ ( b - c ) / a in the event that the swivel arms 53, 54 are approximately at right angles to the fixed clamping arm 52 (maximum distance between the clamping arms 51, 52), and

(b) β≈ ( b 2 - c 2 ) / [ a ( a - c )] in the event that the shorter swivel arm 53 rests in parallel on the fixed clamping arm 52 (minimum distance between the clamping arms 51, 52).

For an embodiment with a = 145 cm, b = 23 cm and c = 18 cm are the clamping angles β about 2 ° in case (a) and approx. 6 ° in case (b). Generally lie typical Clamping angle β between 0 and 15 °, and preferably between 0.5 ° and 10 °.

In another embodiment, the Length relationships of the clamping arms 51, 52 and the swivel arms 53, 54 be different, but according to the invention such that the Clamp arms 51, 52 not in almost all swivel positions are parallel. In any case, this should be done by clamping arms 51, 52 and Swivel arms 53, 54 formed square not the shape of a Have parallelogram, because doing so by the invention granted benefits not described above come.

For practical work with the inventive Cutting device 1 has proven to be advantageous if the Clamping device 5 in at least one large position Distance between the two clamping arms 51, 52 can be locked is. Is the clamping device 5 in such a position locked, so the operator has both hands free to the often bulky cutting material 8 in the clamping device to insert the clamping device 5 instead of with one hand to have to keep open. For the purpose of locking Locking means 71, 72 provided. These can e.g. B. as laterally (i.e. in a direction through which the material to be cut 8 defined plane parallel plane) swiveling, at the bottom End of the movable clamp arm 51 attached locking bracket 71 be formed. Another example of locking means is a locking screw 73 connected to a crank 72 in one of the corners 55 of the clamping device 5 defined quadrilaterals.

FIG. 4 shows a cross section through the cutting tool 3 and its guide device 4 in the cutting device 1 according to the invention; part of the material to be cut 8 is also shown. The cutting tool 3 comprises a handle 31 and a blade 32 which is preferably countersunk in the handle 31. The blade 32 is preferably made of steel and is preferably designed in the manner of a knife blade, ie not toothed and on the Cutting edge 33 sharpened. It can be exchangeable and in this embodiment is held in the handle 31 by a locking screw 34. An adapter element 35, for example made of PVC, which is arranged directly next to the blade 32 and is also countersunk in the handle 31. The cutting tool 3 can also include a stop element 36, for example laterally attached to the handle 31.

When cutting, the cutting tool 3 on the handle 31 held and moved from top to bottom. It will be there preferably guided in a guide device 4. The Guide device 4 can, for example, have two guide gaps 41, 42 include a first guide gap 41 on this side of the Material to be cut 8 and a second guide gap 42 beyond of the material to be cut 8. The first guide gap 41 is preferably formed by two first rails 41.1, 42.2, which simultaneously form the movable clamping arm 51. The The width of the first guide gap 41 is essentially slightly smaller than the width of the blade 32 and des Adapter element 35 together, so that the cutting tool 3rd in the first guide gap 41 just by static friction is held clamped, but not too high To cause sliding friction resistance during movement. The Adapter element 35 is used for an exact adjustment of the Cutting tool 3 to the width of the first guide gap 41 to meet the above condition. Instead of a separate one Adapter element 35 could thicken the blade 32 take on this task. Of course, the first guide gap 41 to the width of the blade 32 alone be adjusted, but experience has shown that it is an exact one Setting the gap width the more problematic the thinner the gap is 41; therefore the solution with adapter 35 preferred. The second guide gap 42 is preferred formed by two second rails 42.1, 42.2, which with the fixed clamping arm 52 and with part of the support column 11 can be identical. Its width corresponds approximately to that Width of the blade 32. The first and second rails 41.1, 41.2, 42.1, 42.2 are, for example, hollow profiles with a square one Cross section made of aluminum, as well as other elements the cutter like the support arms 13, 14. Das Stop element 36 helps keep a constant cut Angle ϕ between the first rails 41.1, 41.2 and the Blade 32 must be observed.

LIST OF REFERENCE NUMBERS

1

cutter

11

support column

12

guide stop

13, 14

support arms

15

Gehrungsansatz

16

miter

21

tripod

22

support

3

cutting tool

31

Handle

32

blade

33

cutting edge

34

locking screw

35

adapter element

36

stop element

4

guide means

41, 42

lead column

41.1, 41.2

first pair of rods

42.1, 42.2

second pair of rods

5

clamper

51, 52

clamping arms

53, 54

swing arms

55-58

corners

63, 64

guides

71

Arretierstütze

72

crank

73

locking screw

8th

be cut

91

document

92

wall

Claims (10)

Device (1) for cutting, in particular, flexible material to be cut (8) in one cutting direction, comprising a clamping device (5) for the material to be cut (8), which has two clamping arms (51, 52) and
Means (53-58) for pivoting the clamping arms (51, 52) relative to one another in one plane, such that the mutual position of the clamping arms (51, 52) defines in each pivoting position and a distance of the clamping arms (51, 52) during pivoting is changeable, includes,
characterized in that
the clamping device (5) is designed in such a way that the clamping arms (51, 52) exert a clamping pressure (p ₁ , p ₂ ) which decreases in the cutting direction (8). Cutting device (1) according to claim 1, wherein the two Clamp arms (51, 52) two opposite sides of one form deformable rectangles, the sides (51-54) of which the corners (55-58) are articulated in pairs. The cutter (1) according to claim 2, wherein the quadrilateral on the one hand from two longer, opposite sides, which are formed by the clamping arms (51, 52), and on the other hand, from two shorter, opposite sides (53, 54), which are used to swivel the Clamp arms (51, 52) serve exist. Cutting device (1) according to claim 3, wherein the longer, formed by the two clamping arms (51, 52) Square sides and / or the two shorter ones, through which Swivel arms (53, 54) formed square sides have different lengths. Cutting device (1) according to any one of claims 2-4, wherein the Length of at least one clamping arm (51, 52) and / or the Length (b, c) of at least one swivel arm (53, 54) is adjustable. Cutting device (1) according to one of the preceding claims, wherein the clamping device (5) means (71-73) for Lock the clamping arms (51, 52) in at least one Has pivot position. Cutting device (1) according to claim 6, wherein the Locking means (71-73) on a clamping arm (51) pivotally attached locking support (71) and / or one attached in an articulated connection (55) Include locking screw (73). Cutting device (1) according to one of the preceding claims, wherein the cutting device (1) has a guide device (4) for a cutting tool (3). Cutting device (1) according to claim 8, wherein the Guide device (4) two guide gaps (41, 42) includes a first guide gap (41) this side of the material to be cut (8) and preferably in a first clamping arm (51) is attached and a second Guide gap (42) is beyond the material to be cut (8) and preferably in a second clamping arm (52) is appropriate. Cutting device (1) according to one of the preceding claims and in particular according to claim 9, wherein the cutter (1) a cutting tool (3) with a handle (31) and a blade (32), which cutting tool (3) is preferably designed such that it is Guide device (4) can be guided according to claim 9.

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