AN ARRANGEMENT FOR A CUTTING DEVICE

Abstract: Arrangement for a cutting device which comprises a circular cutting blade (32) which is preferably mounted so that it can rotate freely and is supported so that it can be displaced across a web (5A) of material which it is desired to cut, consisting, for example, of a paper web which can be fed out from a roll (5), this circular cutting blade (32) being partially accommodated in a tubular acommodating member (33) which is equipped with a slit and extends across the web of material. The invention makes it possible to make the circular blade rotate and be sharpened effectively as it is being displaced across the material web, without any component requiring adjustment or replacement to achieve this. The accommodating member (33) is spring-loaded to make it rotate towards the circular blade (32), causing it to rest against and co-act with the latter via a metal part (34A) so that as the circular blade (32) is displaced along the accommodating member (33) with the said close contact it is made to rotate, while simultaneously being sharpened against the said metal part (34A).

Description: An Arrangement for a Cutting Device The present invention relates to an arrangement for a cutting "device which comprises a circular cutting blade which is preferably mounted so that it can rotate freely and is supported so that it can be displaced across a web 5 of material which it is desired to cut, consisting, for ex¬ ample, of a paper web which can be fed out from a roll, this circular cutting blade being partially accommodated in a tubular accommodating member which is equipped with a slit and extends across the web of material. * 1O The main object of the present invention is primarily to provide a device of the kind described above which en¬ ables the circular blade to be made to rotate and to be sharpened .as it is displaced across the web of material, with¬ out any component requiring adjustment or replacement to 5 accomplish this. The said object is achieved with a device according to the present invention which is primarily characterised in that the accommodating member is spring-loaded to make it rotate towards the circular blade, causing it to rest against 0 and co-act with the latter via a metal part so that as the circular blade is being displaced along the accommodating member with the said close contact effect it is made to ro¬ tate, while simultaneously being sharpened against the said metal part. 5 The invention is described in the following with refer¬ ence to the accompanying drawings on which: .Figure 1 shows the cutting device with an associated housing, viewed at an angle from the front, Figure 2 shows the cutting device viewed at an angle 0 -from the front, looking from one of its ends, with parts of the housing shown partially pivoted up, Figure 3 shows the cutting device, viewed from its other end, with parts of the housing pivoted up, Figure is a schematic cross-section view of the cut- 5 ting device, and Figure 5 shows the actual cutting device with its associated mounting, viewed at an angle to the cutting device. Enclosed in a housing which is designated with the numeral 1 on the drawings there is a mounting arrangement 2, a feed arrangement 3 and a cutting device for a web 5A of material which may be fed out, for example, from a roll 5 consisting, for example, of paper or some other .suitable material. One end piece 1A of the housing 1 encloses drive devices 6 and 7 for the said feed arrangement 3 and the cut¬ ting device 4 respectively, together with, for example, a plurality of electric motors 8 with associated gears 9. The other end piece 1B of the housing encloses the collec¬ tive control devices 10 and actuating devices 11 for opera- ting the said feed and cutting devices 3 S 4 respectively. The control devices 10 are composed of. electrical devices such as.circuit boards with their associated electrical com¬ ponents, for example. The actuating devices 11 expediently consist of an automatic slot mechanism 11 which is coin- operated and, by means of a plurality of control knobs 12, allows the selection of a desired amount of material to be fed out of the arrangement from the roll 5 after an appro¬ priate quantity of coins has been inserted through the coin slot 3 of the automatic slot mechanism 11. The actuating devices 11 and the control device 10 are connected to the said drive devices 6, "via electrical cables 14 in a manner which is not described in detail. The mounting arrangement 2 consists expediently of two supporting devices 1 and 18 located at a distance from each other, each of these being attached respectively to a side wall 1 or 16 projecting out from a housing part 1C which may be connected to a wall; these supporting devices 1 and 18 enable a mounting axle 9, which can co-act with a roll 5 of a material web, to be supported and a new roll 5 to be inserted rapidly. A housing cover 1D which forms part of the housing 1, being connected to the part 1C of the housing and mounted so that it can rpivot around a.hinge 20, expediently has an aperture 21 through which it is possible to see, like a window, for example, enabling the roll 5 and the feed arrangement 3 to be viewed from the outside. The feed arrangement 3 consists of a plurality of drive rollers 3A, 3B, 3C which are preferably rotatably mounted and around which the material web 5A is looped. The said rollers 3A-5C are supported at their respective ends by the said two side walls 15, 16. A central roller 3B expediently has a coating over its circumferential sur¬ face to .increase its close contact with the material web 5A. The housing cover 1D and the end pieces 1A, 1B are designed to be locked in the closed position shown in Fig- re 1 by means of a plurality of locking devices 22, so as to prevent unauthorised tampering with the enclosed parts of the arrangement. The cutting device 4 which is shown in detail inFigure 5 will now be described in more detail so that the actual concept of the invention may be more readily understood. A holder -23 . which is -securely connected by means of a screw device 24, for example, to the drive device 7 ? which is preferably constructed as a toothed belt 7 and is provided for driving the cutting device 4, is mounted on a tube 25, for example, so that it can be displaced alongthe tube 25 which extends across a web 5A of material fed out from the roll 5- The said drive belt 7 is looped round and driven by toothed wheels 26 and 27 respectively, located at the two side walls 15 and 16 respectively. On a mounting shaft 28, one end of which is supported by a roller bearing 29 connected to the holder 23, its other end being connected to a roller bearing 3^ which co-acts with a guideway 30 comprised in a track which extends along the supporting tube 25, a circular cutting blade 32 is mounted, preferably so that it can rotate freely. The circular blade 32 has a straight cutting edge surface 3 A OMPI and a slanting cutting edge surface 32B. An accommodating member 35 in the form of a tube 33, preferably metal, which extends across the material.web 5A and along the guideway 30 and the mounting shaft 25, and has a slit 3 extending in the longitudinal direction of the tube, is designed to accommodate part of the said cir¬ cular blade 32. . The tube 33 is mounted at its two ends so that it can rotate, and it is spring-loaded by spring effect devices which are not shown on the drawing, such as a spiral spring, for example, with its respective ends connected to. the tube 33 and a side wall 15 or 16 respectively. The tube 33 is spring-loaded to make it rotate towards the cir¬ cular blade 3 in the direction of the arrow 35, so that one side edge 34A of the slit 3- rests constantly against .one cutting edge surface 32A of the circular blade. The functioning of the device described above is basi¬ cally as follows: when a sufficiently long web 5A of mater-- ial has been fed out from the roll 5 past the cutting device 4 after actuation of the feed arrangement 3, the drive de- vice 7 for the circular blade 32 is automatically actuated. The belt 7 moves the holder 23 along the supporting tube 25 at the same time as the bearing y\ rolls along the guideway 30. The circular blade 32 thus moves .across the material web 5A which it is desired to cut. Co-action between the side edge 34A of the slit 34 and the cutting edge surface • 32A on the circular blade 3 causes the circular blade 32 to rotate as it is being displaced. At the same time, the circular blade 32 is sharpened during its said displacement and rotation, due to the said close contact with the metal tube 33. Due to the fact that the tube 33 strives to rotate automatically towards the circular blade 32 due to the said spring-loading effect, the blade 32 is driven and sharpened as long as any material of the tube 33 remains and until it is completely worn away. At the same time the tube.33 acts to a certain extent as a protection against contact, pre¬ venting the circular blade 32 from being touchedinadvertently through a delivery opening 36 in the lower face 1E of the arrangement by persons handling the equipment. After the circular blade 32 has been moved right across all the material web 5A the device is ready again to . feed out and cut off a new piece of the material web, the drive of the belt 7 being reversed -so that the circular blade 32 is moved in the opposite displacement direction.

Claims: P a t e n t C l a i m s 1. An arrangement for a cutting device which comprises a circular cutting blade (32) which is preferably mounted so that it can rotate freely and is supported so that it - can be displaced across a web (5A) of material which it is desired to cut, consisting, for example, of a paper web which can be fed out from a roll (5), this circular cutting blade (32) being partially accommodated in a tubular accom¬ modating member (33) which is equipped with a slit and ex¬ tends across the web of material, characterised in that the accommodating member (33) is spring-loaded ' to make it rotate towards the circular blade (32), causing it.to rest against and co-act with the latter via a metal part (34A) so that as the circular blade (32) is displaced along,the accommo¬ dating member (33) with the said close contact . effect it is made to rotate, while simultaneously being sharpened against the said metal part (34A) . 2. An arrangement according to Patent Claim 1, character¬ ised in that the accommodating member (33) is formed by a slit metal tube (33) which is rotatably mounted at its res- pective ends. 3. -An arrangement according to Patent Claim 2, character¬ ised in that the slit (34) is directed towards the circular blade (32), and that the tube (33) is spring-loaded to make it rotate in a feed direction also common to the material web (5A), until it rests against the circular blade (32). 4. An arrangement according to Patent Claim 3, character¬ ised in that the circular blade (32) is supported, mounted so it can rotate freely, by a track (25, 30) which extends along the tube (33). 5- An arrangement according to Patent Claim 4, charactei?- ised in that the track (25, 30) comprises a guideway pro¬ vided for a mounting (23) which is connected to the circular blade (32), along which the said mounting (23) and the cir¬ cular blade (32) appertaining to it are designed to be OMPI displaced and supported when the circular blade (32) is moved along the accommodating member (33).• 6. An arrangement according to Patent Claim 5, character- . ised in that one .end of the said mounting (23) is connected to a roller device (3 *1 ) which is preferably rotatablymount¬ ed and co-acts with the guideway (30), and that the other end of the mounting is connected to a drive arrangement (7) extending along the accommodating member (33). 7. An arrangement according to Patent Claim 6, character- ised in that the drive device (7) for the circular blade comprises a drive belt (7) which is preferably equipped with teeth, and which is looped round deflection and drive wheels (26, 27) respectively, which are located at each end of the accommodating tube (33) and are preferably provided with cogs. 8. An arrangement according to Patent Claim 7, character¬ ised in that a drive arrangement (8, 9) -for driving the said drive belt (7) fo the circular blade is connected to a drive unit (3) provided for feeding out the material web (5A) and preferably designed to be actuated by a coin-operated slot mechanism (11). 9. An -arrangement according to any of Patent Claims 1-8, characterised in that the accommodating member (33) extends parallel with a material feed arrangement (3) and a material delivery opening (36) which are located respectively one on each side of it, and that it is enclosed in a housing (1). 10. An arrangement according to Patent Claim 9, charac¬ terised in that the said material delivery opening (36) is located sufficiently far away from the accommodating mem- ber03) to ensure that fingers and other parts of the body are prevented from reaching the circular blade (32) from outside the arrangement.

Inventors: FLODIN CLAES-GOERAN, FLODIN, CLAES-GOERAN
Applicants: KAANLO AB
Application year: 1982
Main classification: B26D1
IPC codes: B26D1, B26D7