DE1536473A1 - Paper cutter for copier machines - Google Patents

Description

6 Frank: uii am Main 70
Copy / goe

k. October 1967 GzHa / goe

Stewart-Warner Corporation

Paper cutter for copier machines.

This invention relates to apparatus for cutting paper webs and, more particularly, to an improved cutter for Sehing of damp paper webs, which by a copier be guided.

Copy machines usually have a large role with a rolled up paper web that is fed through the machine to create the required copy surface during reproduction to deliver. When the copier using a damp reproduction process is operated, the web or strip is damp at the time of separation. In the past such copier machines were provided with manual or automatic cutting devices to cut the web into sections of various lengths, depending on the amount of material copied or reproduced. The cutting or The cutting apparatus usually had a pair of cutting knives that could move relative to one another, one of which was fixed «!

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and the other could be movable to perform the desired cutting operation to achieve. It has been found that the cutting of the web can be improved when cutting from an edge to the other across the web, the cutting apparatus usually contain a pair of knives rotatably mounted at one end in the conventional scissors type and its The point of overlap moves from one side of the assembly to the other along the cutting blades. This is how the cutting process proceeds on the inserted web across the strip at a right angle to the longitudinal axis of the web. In one of those In this case, the cutting process tends to push the not yet cut web away from the cutting area of the advancing one Knife. This tendency of the web to evade the cutting process may not be detrimental when cutting be dry tracks; on a wet web in a copier However, if it does not only create a jagged cut, but also the path to the Waves and tends to agglomerate "

It is therefore a primary object of this invention to provide an improved To create web cutter for cross cutting of elongated paper web material, which does not have the usual disadvantages owns.

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Another object of this invention is to provide an improved web cutter in which the movement of the Cutting knife during the cutting cycle means that the Web material tends to move into the cutting area between the knives moving relative to one another.

It is another object of this invention to provide an improved web cutter which has a clean cross section enables, regardless of the moisture content of the web material, that is cut.

Another object of this invention is to provide an improved To create web cutters of a type in which the The amount of knife overlap and surface contact between the knives moving relative to one another slightly and can be set quickly.

Other objects of this invention will become apparent from the following detailed description and claims are illustrated in the accompanying drawings which, by way of example, disclose the principle of the invention and the best ways to apply this principle.

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In these drawings show:

Figure 1 is a front perspective view of a copier machine having an improved paper cutter according to this invention,

FIG. 2 is a perspective rear view of the paper cutter of FIG. 1;

Figure 3 is a perspective view of part of the paper cutter of Fig. 1 showing the type of angular adjustment of the relatively fixed upper cutting knife shows,

Figure 4 is a rear elevational view of the improved paper cutter according to this invention,

Fig. 5 is a side elevation of the paper cutter of Fig. along lines 5-5 »

Figure 6 is a schematic electrical wiring diagram for the paper cutter according to this invention.

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In general, the apparatus of this invention consists of an improved paper cutter for cutting a paper material cut transversely in web form and contains a first, longitudinally expanding, fixed knife and a second, separate, longitudinally expanding, movable knife. An elongated web is inserted between these knives for cutting. The device has means for first moving one end of the second knife, predominantly vertically, and the other End, mostly horizontal, to achieve an overlap of the knife edges, and then around this one end of the second Of the knife predominantly horizontally and the other end predominantly vertically, with the web tending to get into the Move the cutting area between the knives to the extent that the cutting area crosses the web during the cutting cycle .

In a preferred form, the upper longitudinally extending knife is horizontally attached to the knife surface, and the lower knife is supported in a slightly inclined position by spaced double pivot mounting arms. The first pivot arm, which carries the higher end of the inclined lower knife, is initially in a generally horizontal position, whereas the second pivot arm, which carries the lower end of the inclined lower knife, is initially vertically oriented. One of the connecting links is around its fixed axis

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oscillates to achieve the desired cutting cycle, with the lower knife is caused to move up and lightly the longitudinally extending cutting edge of the fixed top knife to overlap.

In the drawings, Fig. 10 shows a conventional copying machine having a rectangular housing 12 with a front door or similar member lk which can be quickly opened by means of the handle 16 so that the operator has access to the interior of the machine. The improved paper cutter 18 is carried from the top 20 of the housing, primarily by a base plate 22 having a pair of front base portions 23. The improved paper cutter according to this invention is preferably used for copier machines such as 10, but it can also be used generally in all fields in which the transverse cutting of web material occurs. In this case, a paper web 2k, which is carried by a roll, not shown, leaves the copier and moves up and towards the rear of the apparatus, as the arrow 26 indicates in a general manner. The copier 10 uses wet reproduction processes so that the web 2k exiting the copier area is damp when it passes through the paper cutter 18 »

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On the base member 22 of the cutter, a vertical support member 44 is arranged approximately in the center, which extends across the cutter extends and a larger, central cutting area 45 has through which the path 24 goes when she to the rear of the machine. A left one Sidewall 42 provides rigidity to the tailor. It is connected with one edge to the left edge of the transverse wall 44 and with the lower edge connected to the left front base section 23 · In the same way is on the right side of the Machine (Fig. L) connected to a vertical side wall 58 the front base section 23 and with its lower edge to the transverse wall 44. The front base section 23 only extends a short distance across the machine to form a front base opening 25 through which the web 24 can be easily guided up and into the cutter 18.

An L-shaped, handle 46 is on the transverse wall 44 with his Base 48 attached by a few screws 50. The right-angled Bracket or plate 46 serves to drive a motor 30 through a motor bracket member 52 and some screws 54 to wear. On the right On the side of the machine (FIG. 1), a U-shaped bracket 70 on the side wall 58 in conjunction with bracket 46 serves to create a transverse arranged, driven pressure roller 28 to carry, this roller mechanically with the power output shaft (not shown) of the Motor 30 is coupled. The upward moving web 24

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rests on the horizontal pressure roller 28, the roller motor 30 determines the length of the web 24, which in a certain Time is fed to the paper cutter l8. A guide roll 32 is brought into contact with the web 24 under tension brought and guides them between the guide roller and the driven pressure roller 28. The web is in the feed area captured between the rollers, their movement varying from vertical changes to horizontal as it moves backward into the cutting area of the paper cutter.

As shown in Fig. 5, the left side of the Schneider and the side wall 58 of the machine forward in right angle to the transverse vertical support wall 44.

A U-shaped bracket member 70 having a base portion 72 and inner and outer side walls 74 and 76 is securely attached to the inner surface of the vertical support wall 44 by means of rivets 80. The handle 70 opens to the front of the machine. As can be seen, the paper feed roller 28 is mounted in the lower part of the wall 74 of the bracket 70. An upper knife set 82 is rotatably connected to the left bracket 46 and the U-shaped support bracket 70 and is disposed within the transverse cutting area 45. The upper set of knives contains a basically U-shaped knife support member 84,

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which includes an elongated, generally vertical, knife support portion 86 and a pair of forward facing side walls 88 and 90. The 'upper knife 92 is attached to the knife support portion 86 by spaced screws 94 (Fig. 2), whereby a relatively fixed, horizontally aligned, longitudinally expanding cutting edge 96 is created for the upper cutting element. Upper knife set 82 is rotatably supported on vertical support bracket 46 and bracket sidewall 7k by a pair of axially aligned screws 98 and 100, balanced openings (not shown) are provided near the top edge of sidewall 46 and on sidewall 88 of the upper one Blade set 82, and axially aligned openings (not shown) are located in wall 90 of blade set 82 and side wall 74 of U-shaped bracket 70. Coiled spring 104 is concentric about screw 100 and has one end securely attached to the head end of the screw, while the other end of the helical spring is fixed in the hole 112 of the end plate 90 at a right angle to the axis of the spring and the screw. The spring 104 therefore tends to push the upper set of knives 82 to the left (Fig.l),

The U-shaped bracket member 70 is provided with a pair of aligned slots 114 and II6 which receive the slide member II8. A helical spring 120 is firmly connected to one end

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the one with the wall 74, while the other end 124 with a right-angled associated bolt member 126, which is carried by the slider, is connected. This causes the helical spring to incline 120 to this, the slide Il8 against the outer surface of the side wall 90 to press.

As best seen in Figures 3 and 5, an eccentric or cam member 128 is connected to the outer surface of the rectangular sidewall member 90 of the knife set, the cam member being eccentrically retained by screw 127. Slider 118, carried by the stationary frame of the machine, is pulled away from wall 90 against the tension of spring 120, freeing eccentric cam member 128 and rotating about an axis to increase the radial extent of its outer surface 125 or to be reduced in relation to the end face of the sliding member 118. This determines the angular position of the upper knife set to the axis of rotation, which is formed by the screws 98 and 100, by the angular position of the cam 128. If the cutter is viewed as in FIG. can increase the inclination of the upper knife 96 by nan solves the cam member 128 rotates counterclockwise, and determines again. The cam member thus acts as a holding member in conjunction with the reciprocating one

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Slider Il8, counterclockwise by the amount of rotation to be determined under the dead weight of the set.

The upper set of knives has the further function of supporting the holding device for the guide roller, as indicated generally at 131. An elongated rod 38 extends transversely between the opposing side walls 88 and 90 of the upper set of knives and passes through leveled cutouts there. The rod carries a pair of support arms ^ k for the guide roller, hanging down and carry at their lower end, the guide roller 32nd The shaft 32 is freely rotatable about its axis on the support arms jk. The force of gravity produces a slight pressure on the guide roller, whereby the web 24 is introduced between the guide roller and the driven pressure roller 28.

With reference to FIG. 2, the lower knife set 130 will now be explained. It has an elongated knife support member 129 and a lower knife 1331 which is connected to the upper part of the Knife support member 123 connected and thus basically aligned is. While the upper knife set 82 is arranged so that the cutting edge 96 of the knife is nearly horizontal extends, the cutting edge I36 of the lower knife set is in their starting position inclined slightly upwards from right to left when viewed as in FIGS. Of the

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lower knife set is rotatable in this way by the Support arms 138 and lAO held. The right arm l40 is rotatably connected to the vertical support member 44 by means of a screw member 134, while the lower end of the support arm l4O of the lower knife is rotatably connected to the Blade support member 132 by a second screw member 148. Thereby the knife support arm l4ü can rotate freely around the axis of the screw 134, and the lower knife set I30 can Rotate freely on the same support arm around the axis of screw 148. The left support arm I38 of the lower set of knives is about of the same configuration. It is rotatably connected at its lower end to a fixed, vertical support member or bracket 152 through screw 15u · The base portion 154 of the U-shaped bracket 152 is with the base plate 22 of the cutter tied together. The left support arm is rotatably connected to the mess support member 132 at its upper end by the screw 162. In contrast to the right rotatable support arm l40, the left rotatable support arm I38 is before the start of the cutting cycle aligned in a slightly inclined, but basically horizontal position, while the right support arm 140 is in the rest position of the cutter is basically aligned in a vertical position. The rotatable screw connection 162 is used also to carry the left end 164 of the crank link. The right end I68 of the crank link 166 is rotatably connected

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the one with the drive motor arms 174: by a suitable bolt connection 172. The rotating arm is driven clockwise, as indicated by arrow 176, about its axis 178, the pivot corresponding to the circular path the dotted circle 175 describes. The arm 17 ^ is driven by an electric motor means 170 which has its drive shaft 177 attached to the arm 174 :.

When the arm link 17 ^ rotates clockwise (Fig. 4), the pin connection 172 moves smoothly from the starting position shown to a position as indicated by the circle 172 '. The left end of the knife set 130 initially moves essentially vertically to the extent that the left support arm 138 rotates in the arcuate path as indicated by arrow 182 about the axis formed by screw 150 will. At the same time, the right end of the knife set 130 initially moves predominantly in the horizontal direction like its support arm 1 ^ 0, and therefore the pivot bearing l48 moves in an arc-like manner to a position as indicated by l48 ·. Accordingly, the initial action of the knife is a vertical cutting movement of the left end of the knife with no substantial scissor action due to the horizontal movement of the right end *. As soon as the rotation of the arm 17 ^ proceeds to position 172 ", the left end tilts

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of the knife set to its movement from essentially vertical to change to an essentially horizontal direction, the pivot bearing moving from position l62 'to position l62 " emotional. At the same time, the movement of the right side of the knife set 130 occurs during the last phases of the cutting cycle changed from a substantially horizontal direction to a substantially vertical upward direction against the fixed one Knife set 82, with the pivot bearing iA8 in position 1A8 " emotional. This is particularly important when the cutter is used to cut across a web, such as damp Copy paper.

As a result, the web no longer has the tendency to move away from the cutting area when the knives overlap between the two knives moving relative to one another, but rather the damp copy paper moves in a direction towards the cutting area, as indicated by the arrow 18o. The paper moves into or towards the intersection point, which shifts from left to right, to the extent that the inclined lower knife set moves into an overlapping relationship with the upper knife set. The dotted line l & k (Fig. K) shows the highest position of the lower set of tools and its inclined, overlapping position with respect to the upper set of blades 82. This movement of the lower blade opposite

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the clearer, fixed knife is in sharp contrast to normal scissor action, as in most conventional ones Tailoring is used in which turning the left ends of both knives removes the overlap point from the left can be moved to the right in the same way, but the path or another material that is cut has a tendency to come out of the cutting area between the two knives move around when cutting from side to side advances.

As Fig. 5 shows, the inclined cutting edge 136 of the lower knife set I30 must extend beyond the relatively fixed, horizontally directed cutting edge 96 of the upper knife set 82. As previously stated, the angular position of the upper knife set 82 is adjusted by the angular position of the adjustable cam member 128. After the position of the upper set of knives has been set, it may be necessary to adjust the correct movement of the lower set of knives in order to get an overlap of the cutting knives during the cutting cycle. In order to prevent the lower knife from hitting the upper knife, the plate 186 is adjustably arranged on the vertical support plate kk . Adjustment plate I86 is in the form of a thin disk and is on a threaded link

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l88 attached. The vertical support plate kk has a threaded opening 190 which receives the threaded screw 188. The screw carries a nut to hold the washer 186 horizontally from the support plate kk at a desired distance. The adjustment is achieved by inserting a screwdriver or the like (not shown) in the recess 19 ^ and turning the screw 188 while holding the nut 192 with a wrench or similar tool to close or counteract the disc-shaped abutment plate to move the fixed support member kk.

The lower set of knives, which consists of the knife support member 129 and the knife 133, is inclined upwards and is at an angle to the incoming paper web with the cutting edge I36 facing the surface of the vertical support member kk . The extreme left tip 196 of the cutting edge 136 is in contact with the outside of the disk-shaped adjustment plate 186.

The adjustment is made when the cutter is at a standstill. When the lower set of knives is at rest (Fig. 4), the left tip 196 of the cutting edge 136 touches the setting guide 186 before the start of a cutting cycle. Afterward during the cutting cycle, the upper tip of the cutting

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knife on the setting plate to the left and upwards until the left side of the lower knife 133 is slightly the upper one Knife overlaps. After the left sections of the knives have overlapped and to the extent that the Cutting area or the point of contact between the cutting edges moved from left to right (Fig. 4), can have any inclination of the lower set of knives to chew on the upper set of knives can be counteracted by turning the clockwise upper knife set on the retaining screws 98-100 against the pressure of the helical spring 104, whereby the knife contact is ensured becomes to the extent that the cutting line moves across the web.

As already mentioned, the cyclic operation of the cutter is achieved with the help of an electric motor 170, which has the Arm link 17 ^ rotates. A typical operation with transportation of the paper or another web material and the cyclical operation of the cutter can be seen from FIG. 6, which is schematic an electrical circuit arrangement shows how it is used in connection with a copying machine. Electric AC power is supplied to endpoints 200 and 202. For example, the end point 200 can be connected to the feed line of a single-phase AC power, then 202 being the endpoint of the return line of the system. Electricity therefore flows

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from endpoint 200 through lines 204 and 205 to relay controlled switch 218. The relay controlled switch 2L8 has an upper and lower fixed contacts 220 and 222 and a movable contact 224, a set of normally open single-pole throw relay contacts 206 acts in conjunction with lines 204, 207 and 212 to the cutter motor 170 to stimulate. The relay contacts are closed in response to a signal indicating that the paper is to be cut, without this being the subject of this invention. Movable contact 224 is typically in the up position, engaging contact 220 and completing a circuit via line 226 to paper drive motor 30. A common return line 228 connects the drive motor 30 to the return end point 202. The line 204 also serves to close a circuit that consists of the usually open, single-pole throw contacts 206, the Ilaltelais winding 2l4, the line 2l6 and the end point 202. After energizing the relay winding 2lA, the usually above contact 224 moves downwards and opens the circuit to the paper drive motor between the fixed contact 220 and the movable contact 224 and at the same time closes the circuit between this contact 224 and the movable contact 222. Current flows then through the line 205, the contacts 222 and 224 of the relay 2l8 and the line 230 to the limit switch 210, the limit switch 210 is a usually geachloaae-

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A switch which has a fixed contact 232 and a movable contact 238 which is held open by the cam 234 when the cutter is at rest. Since the Motor driving cam 234 was excited immediately by the closure of the relay contact 206, caused the Cam 234 immediately closes the contacts 232, 238. With the closed contacts 232-238 and the closed contacts 222-224, current flows through line 208 and line 212 to cutter motor 170 to keep it energized simultaneously a bypass circuit is completed by contacts 222-224 via line 207 to hold relay winding 2i4 kept excited regardless of the position of switch 206.

In operation, the copy controls the feeding of the paper and the activity of the cutter. The strip must stand still while it is being cut. At the beginning, current flows from the end point 200 via the lines 204 and 205 to the movable contact 224 of the relay switch 218 and to the drive motor, which remains excited since the contacts 220 and 224 are closed; the current flows through the drive motor 30 and returns to the end point 202 via the common return line 228. Now, if the copy-receiver requests a disconnection of the web on a certain line, the normally open relay contacts 206 close immediately and allow the current from the endpoint 200

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via the lines 2O4 and 2l6 to the relay winding 2lA and flow back to endpoint 202. The winding becomes saturated and the moving contact 224, usually on top, becomes saturated of the relay switch 2l8 releases itself from the fixed contact 220 and closes with the fixed contact 222. As a result line 226 to the paper drive motor is opened and the motor is turned off. Although the limit switch contacts 232-238 are initially open, current usually flows after the closing of the open switch 206 directly to the cutting motor 170 via lines 204, 207 and 212 and from the motor 170 via the Line 228 to return endpoint 202. This will immediately energize the cutting motor so that the cam means 23 ^ rotates and the switch contacts 232 and 238 closes.

Current now flows through stationary contact 222 and line 230 to contacts 232 and 238 of the limit switch and lines 208 and 212 to cutter motor 170 and returns through common line 228 to return endpoint 202, halting the excitation of the cutter motor. At the same time, current flows through the lines 208, 207 and 216 to the relay winding 214 and keeps the movable contact 224 and the fixed contact 222 closed, these elements taking on a holding function for the relay-controlled switch 218. When the cutting motor is running, the lower cutting

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move the knife up and to the left in the manner already described in order to carry out the cutting process, in which the web to be cut has the tendency to move in the cutting area between the closing knives in order to ensure a clean cross-cutting of the web 2k . When the lower cutter is driven by the arm 17 ^ i, the cutter motor also rotates the cam 236 ^{so that the projection 236 moves a full 360 0} so that a full cycle of cutting operations is completed before the projection 236 opens the movable contact 238 strikes and the normally closed contacts 232-238 of the cam operated switch 210 opens. By opening these contacts, the motor 170 and the holding circuit are de-energized, as a result of which the movable contact 22, which is usually located at the top, can move from the fixed contact 222 to the upper fixed contact 220. The contacts 22 ^ and 220 excite the drive motor when they close, whereby the motor moves the paper web in the direction of the arrow 2kO (Fig. 5) until the copy receiver excites a new cycle of the cutter.

The circuit in Fig. 6 shows the cam image 23 ^ as a circular disc with the cam projection 236. In reality and with reference to Fig. K, the left rotatable knife support arm 138 leads in a cam function compared to the cam-controlled

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Switch 210 off. The spring arm 2 ^ 0 acts as a cam follower with the pointed end 2 ^ 2 in connection with the reciprocating arm 138 so that the microswitch portion of the cam operated switch 210 (not shown) closes contacts 232-238 to ensure continued excitation of the cutter motor. The arm 138 is oscillated to the extreme vertical position, the l62 through the pivot point ^M is identified, and then returns to the in Fig k. Position shown, wherein it opens the cam-controlled switch contacts 232-238 and both the blade motor and the holding De-energizes relay winding.

The mode of operation of the cutter has been described above in connection with a fully automatic machine, wherein Electronic signals are used to turn off the transport of the web and perform a full cycle of cutting movements to be carried out, with a resumption of transport by rail. Of course, the cutter can also be completely mechanical and operated manually in conjunction with or separately from the transport of the train. The only conditions are that Interruption of the transport of the web and the subsequent movement of the lower set of knives to its lowest, most

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inclined position after the transverse separation of the web. Again it is pointed out that, albeit the cutting device according to the invention was shown in connection with a copier for a dampening process, but it was also completely independent of which can be used as a cutter separate from a copying machine, and indeed it has a wide field of application for the transverse cutting of paper webs or other web materials.

The invention is particularly in its preferred embodiment portrayed and described. However, it will be apparent to those skilled in the art that the foregoing and other modifications are possible, in form and in detail, without departing from the spirit and subject matter of the invention.

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Claims (1)

- 24 - Godfather ta nsprüche 1. Device for cutting a web transversely to the tooth axis,
comprising a first and a second knife (92, 133) with longitudinally extending knife edges (96 * 136), means for supporting these knives in different planes (84, 13 & 14o) and for moving these knives in cutting and operative relation to one another and means (28, 32) for inserting the web material between these knives, thereby
characterized in that this holding means means
(138, 140, 166, 170, 174) include first one end of the second knife predominantly across the first knife and the other end of the second knife longitudinally to the first
Knife to move to the knife edges for cutting
bring and then the said other end of the second knife mainly transversely and the said one end of this
To move the knife mainly longitudinally towards the intersection point obtained, the web tending to get into the
To move the intersection of the knife edges to the extent that
how the overlap point of the knife edges crosses the web during the cutting cycle. 2. Device according to claim l, characterized in that that the means for carrying the knives include means for rotatably mounting the second knife, which 00 9.8 18/0734 from a first and second support arm (138, IAO), means for the rotatable connection of one end (150) of the first arm to the fixed support means and the other end (l62) this arm to the second knife, the center lines between the pivot points always with the edge of the second knife is aligned, and means for pivotally connecting the ends (l3 ^ i 1Λ8) of the second arm with fixed carrying means and the second knife, wherein the center line between the pivot points is basically at a right angle to the edge of the second knife stops when the knives are fully open. 3. Device according to claim 2, characterized in that that the means for moving the second knife include eccentric drive means (166, 17Ό, which are connected to this knife and cause the support arms to go back and forth, the first support arm from an initially aligned position to a basically right-angled position to the cutting edge and the second arm emerges from a basically right-angled position Move position to the edge of the second knife in a nearly aligned position hereby. 009818/0734 k, device according to claim 1, characterized in that the means for carrying the second knife are arranged so that they give the second knife such an inclination to the first knife that it is ensured that the second knife is opposite to the direction of movement of the overlap point of the Knife moved when cutting through the web. 5. The device according to claim 1, characterized in that in that the means for carrying the knives includes means (98, 100) for rotatably closing one of the knives carry around an axis that is roughly parallel with the cutting edge of the knife and at right angles with the path of the Railway stands, and means (10 ^) that strives to rotate this knife about its axis, and adjustable holding means (118, 128) to indicate the angular position of the cutting edge of this knife in relation to the web and the other knife to determine. 6. Device according to claim 5, characterized in that that the adjustable retaining means is an adjusting washer (128), means for eccentric fastening (127) of this disc and a relatively fixed abutment slide (118), which is in the way of the adjustable eccentric 009818/0734 ters is arranged, included, the angular setting of this eccentric, the angular position of the upper knife set certainly· 009818/0734 -Qt ₇ Blank page