DE1166660B - Cutting device for installation in machines or for manual operation to cut strips or tapes - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school Class: B 26 b

German class: 69-25

Number: 1166 660

File number: F25862Ic / 69

Filing date: May 31, 1958

Opening day: March 26, 1964

Devices and devices for cutting plasters, paper strips, adhesive strips or the like Blades or cutting edges are arranged like pliers are already known. In these known pincer-like Cutting devices is activated as soon as the rotatably mounted blade is removed from the stationary Blade is pushed further away, the vector of the cutting force that counteracts the inhibiting shear force, smaller. In the extreme case, e.g. B. if the blades with their cutting edges at right angles are related to each other, it is only the spring pressure that actually keeps the cutting edges engaged. Will however, in order to achieve a better cutting effect, the spring pressure increases, there are disadvantages; because with higher spring pressure increases the friction between the blades and requires more cutting Force.

A cutting machine for an adhesive tape for boxes, cartons and the like is known in which the paper strip from a roll over a table through the cutting device consisting of one fixed knife and a movable knife working together with the former, which is on the rotatable frame clamped box od. Like. Is fed. If a sufficient amount If the tape is supplied, the cutting mechanism is actuated. The device is controlled by means of a foot lever. By pressing down the knife by hand, the Any piece of the paper strip can be removed from the machine. In a known metal cutting device There are two scissor jaws with blades attached for use on a vice are attached to two legs; the blade can either be attached to or removed from the by means of a screw Blade can be adjusted. In a known device for stripping insulation from wires, a known device whose blade is fixedly attached to a rotatable frame and through a slot in a cutting table on which the strip to be cut lies goes, as well as a known one Devices in which one of the two blades is rotatably mounted are also not the following Characterized features essential to the invention are present.

The invention relates to a cutting device for installation in machines or for manual operation to cut strips or tapes, preferably adhesive strips made of plastic, consisting of two frame members rotatably mounted about a transverse axis in relation to one another, a blade rigidly attached to a frame member and cutting device for Installation in
Machines or for manual operation for
Cutting strips or ribbons

Applicant:

George Harold Fritzinger, West Orange, NJ
(V. St. A.)

Representative:

Dipl.-Chem. Dr. A. Ullrich

and Dipl.-Chem. Dr. T. Ullrich, patent attorneys,

Heidelberg, Bismarckstrasse 17th

Named as inventor:

George Harold Fritzinger, West Orange, N. J.

(V. St. A.)

one arranged to be rotatable about a further transverse axis relative to the other frame member and by means of a spring Blade inclined to its transverse axis, the cutting edges of the blades at an angle to one another stand and the blades are inclined at an angle to each other that they move when the rotatable Blade around its axis of rotation against the force of the spring more and more interlocking and progressing Point contact of the cutting edges takes place; the invention is characterized in that the Axis of rotation of the rotatably mounted blade to that associated with the rotatability of the frame members to one another Transverse axis in the plane of both axes in the direction of the progressive point contact between the blades is inclined so that the cutting edges of the two blades during the cutting process meet at substantially the same angle.

An embodiment of the cutting device is described with reference to the drawings.

F i g. Fig. 1 is a side elevation, with parts removed, showing an apparatus according to the invention shows;

F i g. Fig. 2 is an end view;

F i g. 3 is a partial view along the cutting edge of the lower blade of FIG. 1 and shows, in dashed lines Lines shown, the corresponding position of the cutting edge or upper blade at the moment when the blades start to interlock;

F i g. Figure 4 is a partial side elevation of a second embodiment of the device according to the invention;

409 540/46

F i g. 5 is a partial view along the cutting edge of the lower blade of FIG. 4 and shows in shown in dashed lines, the corresponding position of the cutting edge of the other blade at the moment when the blades start to interlock;

F i g. Figure 6 is a partial side elevation of a third embodiment of the apparatus of the invention;

F i g. Figure 7 is a partial top plan view taken along line 7-7 in Figure 6 as the blades begin to interlock;

F i g. 8 and 9 are an end view and a side elevation of one embodiment of the apparatus for use by hand according to the invention;

FIGS. 10 and 11 are partial cross-sectional views according to FIG the lines 10-10 and 11-11 in Fi g. 9;

Figures 12 and 13 are an end view and a side elevation another embodiment of the device according to the invention and

F i g. 14 is a plan view of the embodiment of the device according to FIGS. 12 and 13 according to the lines 14-14 in FIG.

In the in Fi g. 1, 2 and 3, a blade 10 is rigidly attached to a support member 11, which in turn is mounted on a support or frame member 12, for example the side surface a device partially shown here. The other blade 13 is rotatable on a transverse axis attached to a U-lever 14, which in turn is rotatable is arranged on a transverse shaft 15 which is attached to the side surface 12 at right angles thereto. The means for rotating the blade 13 can consist of lateral pins 16 and 17 located on the blade exist, which engage in corresponding openings in the side legs of the U-lever 14. Of the outer edge of the blade 10, which is also its cutting edge, can run parallel to the shaft 15, so that Strip material that is inserted at right angles to the shaft, but is not cut at an angle. So that the blades lie against one another with progressive point contact, the edge of the blade 13 is to Horizontal beveled as shown in FIG. 2 is clearly shown. To achieve a point pressure The blade 13 is positioned between the blades by a leaf spring located at the outer end of the U-lever 14 18 pressed inwards against a locking pin 19 on the U-lever, which is attached so that the blades first touch at the ends of their cutting edges when the U-lever 14 is moved upwards. However, in order to facilitate the adjustment of the intended position of the blades, the blade 13 is around its Axis of rotation inclined slightly further inwards than that for touching its cutting edge with one the blade 10 corresponds to the necessary position and it is at the point of its first contact with the blade 10 is provided with a guide nose or tab 20 which is inclined outwards so that the rotatable blade is held slightly outwards in the shear position with the blade 10 when the blades 10 and 13 are against one another.

The device according to the invention sol! achieve a uniform cutting effect over the entire length of the blades, ie it should be achieved a progressive point contact between the blades with a point pressure that varies directly with the shear resistance of the material to be cut, so that the material to be cut exactly and regardless of its toughness or thickness with a Minimum force is cut. This better effect is achieved by the rotation of the blade 13 in its support lever 14 on such a transverse axis, the position of which is prescribed in a certain area in relation to the support lever 14, this area also being the line of progressive contact between the blades when the blades lie against each other, contains. When using hollow ground blades, the axis of the rotatable blade and its cutting edge can lie in a certain plane. These basic ideas are evident from the following detailed description, in which the term "cutting angle" is used to denote the angle which lies between the cutting edges of the two blades when the blades are partially adjacent, such as along a radius line of the rotatable frame shaft 15 can be seen at right angles to the surface profile created by the blade edges when the blades are moved together. This cutting angle, which is on the order of 15 to 20 °, appears clearly in FIG. 2 as angle C. The term "face angle" is used here to denote the angle which lies between the opposing surfaces of the blades when they lie against each other. This angle is required if the blades are not hollow ground so that they slide against one another at their cutting edges as the point contact progresses. This dihedral angle is the angle F in FIG. 3 between the cutting edges of the blades, seen in the direction of the surface profile, formed by the blade edges. Furthermore, the term "effective part" here denotes that part of the two blades which is moved past the other when the blades are in full engagement.

As mentioned above, it is desirable that the cutting edges of the fixed blade 10 be parallel to the shaft 15 so that the tape is not cut at an angle. Accordingly, the effective part of the movable blade 13 is inclined to the shaft 15 at the desired surface angle F in order to obtain the necessary space for the point contact between the blades. For example, that part of the blade 13 which extends from the guide nose 20 to the pin 17, as shown, can run in an arc around the center 21 of the shaft 15, or it can also be straight and tangential to an arc from the guide nose 20 around the center Be 21. However, the cutting edge of the blade 13 is not arcuate or tangential with respect to the same center 21, but arcuate and tangential - as the case may be - with respect to a center 22. which is offset upwards with respect to the center 21 because of the inclination of the blade, so that the face angle F described above is formed.

To understand the need to incline the axis of rotation of the blade 13 on the support lever 14, Blade 13 is considered next here. It is a number of additional determinant properties which determine the successive touching points of their cutting edge. Regarding the Reference is made to the first determination property with regard to the guide nose 20 on the cutting edge on a radius line 23 in FIG. 1, which extends from the center of rotation 21 through the pin 17, and a Chord line 24 which extends from the leading edge at right angles to this radius line and this at 25 crosses.

If the blade 13 were rotatably attached to the support lever 14 at the intersection point 25, then the Resistance force of the sliding friction of the blade 13 with the fixed blade 10 during the advancing Moving the blade 13 past the fixed blade 10 in the direction of the blade 13 would act and the point pressure that is generated by the spring 18 do not affect. When the food is cut the shear resistance tends to push this blade 13 away from the fixed blade 10. The feather 18 counteracts such a divergence, but the spring pressure alone can under certain circumstances for a reliable cutting effect is not sufficient, as the resistance from a hard point in the Material to be cut can easily cause the spring force to be overcome, unless the spring would be so extraordinarily strong that it results in an extremely large sliding friction between the blades. However, in order to avoid strong spring pressure and still a safe cutting effect of the blade To achieve 13 with the fixed blade 10, the axis of rotation of the blade 13 is at the pin 17 on the Radius line 23 outside the intersection point 25. In this way, the shear resistance can be neutralized or caused to do so are dependent on increasing the point pressure in direct proportion to the shear resistance of how far the pin 17 is arranged from the intersection point 25.

Would be the axis of rotation of all sections, the blade 13 would be parallel to the shaft 15 at the pivot point 17, then only the first subsections, their chord line does not extend beyond this axis, cut exactly, but the remaining parts of the blade would not cut exactly as there would only be spring pressure to just make contact with these remaining parts of the blade 10 to maintain. If this parallel axis of rotation is far enough beyond the intersection point 25 would also lie beyond the chord line of the last section of the blade 13, as at the pivot point 16, then the first sections would run at such a steep angle to their chord line, that they would be too tight against the blade 10, especially if the blades are of considerable length or when the distance between the blade 13 and the shaft 15 is relatively small.

However, if the fulcrum for each of these sections of the rotatable blade 13 in the above is determined in the manner explained in the penultimate paragraph, the successive pivot points determine one Axis coplanar with the cutting edges of the rotatable blade 13 or when the edge is curved is, with the imaginary middle line of the cutting edge, except for the face angle F. Because of this dihedral angle, the axis of rotation 16-17 is more inclined by the size of the "dihedral angle" from the shaft 15. Or, seen differently, the axis of rotation 16-17 is arranged in relation to the blades so that that at every point of contact between their cutting edges practically the same angle between the radius line of the axis of rotation through this point and the tangent line of the surface profile by the cutting edges at this point.

Since each section of the blade 13 to the support lever 14 is substantially in the same proportion its point of contact with the fixed blade 10 is rotatable, a uniform cutting effect is obtained Achieved along the entire length of the blades, so that exact cutting at all points of the blades with lowest possible driving force is made possible.

In Fig. 4 and 5, a second embodiment of the device according to the invention is described in FIG a fixed blade 26 on a partially shown side surface 12 and a lever 14 rotatably in turn are mounted on the shaft 15. As before, a blade 27 with a guide nose 28 is rotatable on the Lever 14 on a transverse axis with the help of pins

ίο 29 and 30 mounted that extend away from the blade and engage in corresponding openings in the lever 14. Likewise, the blade 27 is through a Spring 18 pressed against a lock 19. In this embodiment, however, the dihedral angle F obtained by inclining the fixed blade 26 to the rotating shaft 15. All the effective part of the rotatable Blade 27 in this embodiment is either bent around the center 21 of the shaft 15 or flat on one Tangent to an arc through the guide nose 28 around the center 21, the flat shape in the drawing is shown. Since the blades are abutted, the rotatable blade 27 is easily turned outward its transverse axis is pressed on the lever 14, which reflects the inclination of the fixed blade 26 by the dihedral angle F is due. As in the first embodiment, the transverse axis is the rotatable blade at the pivot points 29 and 30 obliquely to the frame pivot shaft in order to achieve a uniform Cutting effect.

In the third in Fig. Ausführangsform 6 and 7, 31 with an oblique cutting edge and a guide nose 31 α fixedly mounted on the lever 14 is a blade, wherein the active part of the blade, for example, flat and parallel with the shaft 15.

The other blade 32 can also be flat. The blade 32 has pins 33 and 34 which are rotatable in openings on the opposite legs 35, 36 of a U-lever 37, which is on the partially shown lateral Frame surface 12 is mounted, engage. The blade 32 will. by a leaf spring 38 on the Lever 37 pressed outwards about its axis of rotation against a lock, which is caused by the stop of the upper Part of the blade is formed against the nose 39 on the lever (Fig. 7), the blade 32 stands in the required position Diagonal angle F obliquely to the shaft 15. However, its axis of rotation on the lever 37 is parallel to the shaft 15 and is at the face angle F to the blade, since the effective part of the other blade 31 is parallel to shaft 15 is what is consistent with the basic idea of the invention to achieve a uniform Cutting effect.

In Fig. 8, 9, 10 and 11 a device according to the invention is shown, which for holding in the palm of your hand suitable is. This device consists of lower and upper frame members lying one above the other 40 and 41, for example made of light metal, such as. B. aluminum, can be and to the Flange sides, d. H. can be trough-shaped for greater strength. These Frame members are rotatably connected to one another by a pivot rod 42; the rotating rod is from an arm 43 of the lower frame member carried at one end thereof. This arm is only on one Side of the lower frame member attached, wherein a gap 44 (Fig. 11) is created, the one side for the lateral introduction of the strip material between the frame members in the right Angle is open to the blades as shown. Example

Claims (1)

7 8 wise, the arm has a leg 45, which with one of the above-described by a lateral Verset-Seitenflansch the lower frame member a whole zen of the pivot point between the frame members, and has an overhanging arm 46. to create a passage at right angles to the A slotted nose 47 extends upwardly from blades for the introduction of the material to be cut Leg 45, and hold an identical slotted nose 5. 48 extends from the far end of the over- This device can be flat, proportionally hanging Arm 46 upwards, which supports the pivot rod 42 of moderately thick frame members 61 and 62 from plastic. The extensions of the rotating rod 42 exist on the schem material. The upper frame member 62 Lugs 47, 48 go out through holes in the se- has a pair of interdependent slotted lugs tenflanschen the upper frame member; hereby is io 63 at its rear end, and the lower frame die rotatable connection between the frame members has a pair of upstanding slotted lugs 64, that causes. By this arrangement includes those comprising the upper frame member and those through upper frame member the arm 43 and leaves no un- a transverse pin 65 rotatably connected to the lugs 63 Edges closed when the device is in use. At its front ends the lower one has could interfere with your hand. 15 frame member 61 a blade 66, which is firmly mounted on it At the ends of the frame members 40 and 41 are animal, and the upper frame member 62 is a blade opposite to the pivot point 42 blades 49 and 67, which are rotatably attached to it with a transverse pin 68 50 attached. The blade 49 is on the frame- is. As with the one previously described by hand member 40 fixedly mounted and has an operative part, actuating device stands the rotatable blade which, as shown, can be bent about pivot point 42, engaging the inner side of the fixed blade can. The other blade 50 is on the frame member 41 under pressure from a torsion spring 69, which is around the pin rotatable at the cross pin 51, which is wound through openings 68 and α in a recess 62 at the end of the extends in the side flanges of this frame member; Frame member 62 is arranged; also the Schneiddie Blade has slotted tenons 52 and 53 in the right edge of the two blades are of the same size th angle to it, which can be rotated on the cross pin. 25 at an angle to obtain the cutting angle C. the The blade 50 comes into abutment with the inner side outermost position of the rotatable blade about its rotation Fixed blade 49 under the pressure of a torsion pin 68 is limited by the stop of an arm spring 54 surrounding cross pin 51; the torsion 70 of the blade against the bottom wall of a notch 71 spring has straight ends 55 and 56, one of which is in the upper frame member. The leadership of the upper against the underside of the frame member 41 and the 30 blade into scissor engagement with the lower blade others against the inner side of the rotatable blade will when the blades are out of the completely separated position 50 is directed. In order to be completely connected to one another, by an inwardly sloping one To enable the blades to be moved, the outermost guide lug 72 is effected on the rotated blade. Position of the rotatable blade when engaging the frame members are held by a torsion spring fixed blade opened by the stop of the projection 52 35 73 on the transverse pin 65; be stopped determined against a nose 57, which is determined by the adjacent but by the stop of the rotatable nose 63 against batten side flange of the upper frame member from the lower frame member 61 (see Fig. 13); through this is bent over. However, in order to adjust the loading, a complete disengagement of the blades is determined Facilitating the position of the rotatable blade works. The rotating blade is in a ghost they with an inclined guide nose 58, as previously 40, suitable dihedral angles to the fixed blade, as in FIG described, provided. When the frame members shown in Fig. 13, and the pivot pin of the rotatable are closed, the guide nose 58 abuts against the blade is inclined to the frame axis of rotation 65 in Frame member 40, whereby the closed position of the F i g. 14, just like the one previously described Frame members is limited. The frame members embodiment. are opened by a U-shaped leaf spring 59, 45 As far as this is to be operated by hand device between the upper frame member 41 and the device basically the same as the previously be-transverse arm 46 of the lever 54 is placed, with the open written. However, it differs in one Position through the stop and the end flanges 60 free space at right angles to the blades of the upper frame member against the lever arm 46 for the purpose of feeding the material to be cut between the is limited (Fig. 9). 50 blades by moving the rotatable ones to the side As in the previously described embodiment ends of the frame members from the opposite ends, one of the blades stands, in this case the rotatable ends that support the blades. This offset is in blade 50, at a face angle to blade 49, as clearly shown in FIGS. 13 and 14. Preferably, the one shown in FIG. 9 to see. Because the cutting edge of the rotating amount of the offset is approximately equal to the length of the clinable blade in the direction of its movement inclined to completely free space at right angles (Fig. 8), the transverse pin 51 for the rotatable too to get the blades. Another advantage of the blade at an angle to the frame axis of rotation 42 (Fig. 10), the use of an offset construction according to which the even cutting effect on the illustration is that it fits comfortably in the hand is obtained over the entire length of the blade. To the one and easy to handle. In addition, it allows the material to be guided into the space between the blades 60 to facilitate a simple pivot connection between the frame members from the side of the device, which is formed by rotating lugs on both sides of the cutting angle C by an equal bevel of frame members as shown , the cutting edges of both blades in their course _ ... or obtained in their direction of movement (Fig. 8). Claim: Another manually operated device 65 1. Cutting device for installation in machines according to the invention is shown in FIGS. 12, 13 and 14, or for actuation by hand for cutting. As can be seen from the following description, that of strips or ribbons, preferably This device differs fundamentally from adhesive strips made of plastic, consisting of two Frame members rotatably mounted in relation to one another about a transverse axis, one on a frame member rigidly attached blade and one rotatable about a further transverse axis to the other Frame member arranged and inclined by means of a spring to its transverse axis blade, wherein the cutting edges of the blades are at an angle to each other and the blades are at an angle are inclined to each other that they are upon movement of the rotatable blade about its axis of rotation against the force of the spring interlock more and more and a progressive point contact of the cutting edges, characterized in that the axis of rotation (16, 17) of the rotatably mounted blade (13) to that of the rotatability of the frame members (12, 14) with respect to one another associated transverse axis (15) in the plane of both axes in the direction of the advancing Point contact between the blades is inclined so that the cutting edges of the two Blades hit essentially at the same angle during the cutting process. 2. Apparatus according to claim 1, characterized in that the axis of rotation of the rotatable Blade (13 in Fig. 1) essentially parallel to the axis of rotation (21 in Fig. 1) of the frame members and the cutting edge of the rotatable blade is substantially equidistant therefrom Rotation axis are arranged. 3. Apparatus according to claim 1 and 2, characterized in that the cutting edge of the rotatable blade (13 in Fig. 1) obliquely to the frame axis of rotation in a direction in the right Extends angle to said course and the axis of rotation of the rotatable blade obliquely to The axis of rotation runs in a direction transverse to the course mentioned. 4. Apparatus according to claim 1 to 3, characterized in that the frame members a plate-like shape (z. B. in Fig. 11) and arranged one above the other at a distance from each other are, with one of the frame members (z. B. 40) with one with the frame member only on one Side of the same connected and beyond the frame member transverse part (43 in Fig. 11) is provided in which the other frame member (41) is rotatably mounted. 5. Apparatus according to claim 1 to 4, characterized in that the plate-shaped frame members (For example in Fig. 12, 13 and 14) one above the other at a distance from one another and their rotatable interconnected parts of the blades arranged offset along the frame axis of rotation are (Fig. 4). 6. Apparatus according to claim 1 to 5, characterized in that a guide tab (z. B. 58 in Fig. 9) extending from one of the blades at the point of first engagement with the other blade extends and obliquely outwards with respect to the course of movement of the blades runs towards each other, is arranged. 7. Apparatus according to claim 1 to 6, characterized in that between the frame members spring-like means (z. B. 59 in Fig. 9 or 73 in Fig. 13) are inserted. 8. Apparatus according to claim 1 to 7, characterized in that on which the rotatable blade supporting frame member (14 in Fig. 1) a lock (19) is provided, which is the outermost position the rotatable blade (13 in F i g. 1) limited. 9. Apparatus according to claim 1 to 8, characterized in that one of the blade edges in with respect to the direction of movement of the blades against each other obliquely and the other edge of the blade runs at right angles to this direction. 10. Apparatus according to claim 1 to 8, characterized in that both blade edges run obliquely with respect to the direction of movement of the blades against each other. Considered publications:
German patent specifications No. 477 536, 613 322, 572;
U.S. Patent Nos. 1,518,151, 1,565,654, 333108, 2 604166, 2 609 716. 1 sheet of drawings 409 540/46 3.64 © Bundesdruckerei Berlin