JPH09201792A - Device for cutting off into single piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable high dignity of cutting at the time of cutting off into a single piece to obtain by being provided a device with only one knife. SOLUTION: A device 10 to cutting off an extrusion strand 12 into a single piece 11 is equipped with a strip drum 15 and an opposed drum 16 with a comparatively small diameter. A movable knife 25 is disposed inside of the strip drum 15 equipped with plural notches 21. In this configuration, a movement orbit 40 of the knife tip 39 is formed to be similar at least to an elliptical.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a device for cutting extrudate strands into single pieces.

[0002]

PRIOR ART German Federal Patent No. 3315925
According to the specification, a device is known which comprises one cutting knife above and one below the extrudate strand conveyed at a constant speed. Both cutting knives are connected to one another via a transmission. The transmissions each produce a circular movement path of the tip of each cutting knife, which movement path penetrates into the extrudate strand to at least half the thickness of the extrudate strand. A single piece is cut from the extrudate strand when both cutting knife tips are each pushed into the extrudate strand to half the thickness of the extrudate strand. This known device is expensive due to the provision of two cutting knives.
In addition, the cutting gap between both cutting knives has to be relatively small in order to obtain a straight cutting edge, which results in the risk of contact between both cutting knives and thus damage. In addition, the extrudate strands show a tendency for debris to form when two cutting knives are used, which debris contaminates the equipment and results in relatively high maintenance costs. However, using only one cutting knife and guiding it along a circular trajectory curve with a reasonably large diameter does not lead to the desired result. The disadvantage of this type of construction is that the circular curvature required for it is significantly offset from the straightest possible track portion in order to produce a straight cutting edge.

[0003]

The object of the present invention is to eliminate the abovementioned drawbacks.

[0004]

According to the present invention, the above object is achieved in an apparatus for cutting a plastically deformable extrudate strand conveyed at a constant speed into a single piece as claimed in claim 1. , A sole drum having a movable knife, at least one notch cooperating with the knife being formed on the mantle surface of the drum, so that at least the tip of the knife has an at least elliptical movement trajectory. A generating device is connected to the knife via a connecting link, the movement path of the knife tip having a focal point located inside the drum and two axes of different lengths. , The first axis of which protrudes from the drum by at least a value corresponding to the thickness of the extrudate strand, and the second axis of the movement track is located completely inside the drum. It is more resolved.

[0005]

An advantage of the present invention is that the quality of the cutting surface is enhanced by the special movement trajectory of the cutting knife, even though only one cutting knife is used. Since the device has only one cutting knife, it is relatively simple to construct and operates without failure. At the same time, the occurrence of debris is avoided,
This results in a relatively low management cost of the device.

Other features of the invention are set forth in the other claims. The special shape of the movement trajectory of the cutting knife associated with the extrudate strand further improves the cut surface quality. By providing two planetary gear transmissions, the path of motion of the cutting knife is easily obtained and, if necessary, for changing parameters such as extrudate strand thickness or extrudate strand feed rate. The movement trajectory can be easily adapted. One drum,
By using only one cutting knife, a drum with a relatively small diameter can be used as an additional guide. This reduces the structural dimensions of the device in particular.

[0007]

DETAILED DESCRIPTION OF THE INVENTION Candy Extrudate Strands 12
The device 10 for dividing the candy into single pieces 11 comprises a continuously operating conveying device for the candy extrudate strands 12, of which only the guide channel 13 is shown in FIG. There is. Exit end 14 of the guide passage 13
Opens centrally into the area between the two drums 15, 16 of the device 10, where the mantle surfaces of the drums 15, 16 guide the candy extrudate strand 12 and the single piece 11. The distance between the outer surfaces of the drums 15, 16 corresponds to the thickness D of the candy extrudate strand 12.

A drum 15 which will be referred to as a strip drum hereinafter
Are supported on one shaft 17 and have a larger diameter than the other drum 16, which is referred to below as the counter drum, which counter drum 16 is supported on the shaft 18.
The strip drum 15 and the counter drum 16 are constrainedly connected and driven, for example via a transmission device (not shown), so that the peripheral speeds of their mantle surfaces are the same and at least the candy. It corresponds to the feed rate VBX of the extrudate strand 12. Further, the strip drum 15 and the opposing drum 16 are
A straight line 19 connecting 7 and 18 is arranged so as to extend at a right angle to the feeding direction X of the candy extrudate strand 12.

The strip drum 15 is provided with a plurality of, for example, five notches 21 at the same angular intervals, and the opposing drum 16 is provided with, for example, one notch 22. One notch 21 of the strip drum 15 and one notch 22 of the counter drum 16 form a straight line 1 during the rotational movement of the strip drum 15 and the counter drum 16.
It matches within the area of 9.

Inside the strip drum 15 there is arranged a cutting device 24 with a movable knife 25.
In that case, the movement of the knife 25 is such that the knife 25 passes on its movement trajectory 40 through each one notch 21 of the strip drum 15, the candy extrudate strand 12 and the notch 22 of the counter drum 16. It is synchronized with the rotational movement of the drum 15 and the counter drum 16. The size of the notches 21 and 22 depends on the time required to cut the candy extrudate strand 12 or the movement of the knife 25.

To move the knife 25, the knife 2
5 are rigidly connected to the connecting link 26 at a distance and in parallel. The coupling link 26 is used for the opposing drum 16
Of the candy extrudate strand 12 is connected to a transmission 27 arranged on the side opposite the candy extrudate strand 12. This transmission 2
In the present embodiment, 7 consists of two planetary gear transmissions 28, 29 which are arranged one above the other, these planetary gear transmissions each having a fixed internal gear 31 of the same shape,
In these internal gears, external gears 34 of the same shape are eccentrically supported by cranks 32 and 33, respectively. The external gear 34 has half the number of teeth of the internal gear 31. The crank 32 of the planetary gear transmission 28, which is driven by means not shown, is connected to the connecting link 26 via a first eccentric body 35 and a rod 36 rigidly connected to the connecting link 26 at right angles. ing. On the other hand, the crank 33 of the planetary gear transmission 29 is connected via an intermediate link 37 to a second eccentric body 38 hinged to the connecting link 26.

The above-described configuration of the planetary gear transmissions 28, 29 and the connecting link 26 makes it possible to obtain a guide of the knife 25 which is always perpendicular to the feed direction X of the candy extrudate strand 12.

The lengths of the cranks 32 and 33, the eccentric bodies 35 and 38, the rod 36 and the intermediate link 37 are the same in both planetary gear transmissions. Advantageously, in order to obtain a good inertia balance, the center of gravity of the connecting link 26 is located at the point of application of the eccentric body 35 on the rod 36. To position the center of gravity in this position, a counterweight, not shown, is connected to the connecting link 26. Similarly, for inertia balance in both cranks 32, 33 as well as eccentrics 35, 37, counterweights, which are also not shown, are likewise fitted.

The device 10 described above operates as follows.

When the crank 32 of the planetary gear transmission 28 is driven counterclockwise, each point of the connecting link 26 and thus the knife tip 3 rigidly connected to the connecting link 26.
9 moves on the same elliptical motion orbit. In FIG. 1, the trajectory of the knife tip 39 is designated by the reference numeral 40. In that case, the direction of rotation of the motion trajectory 40 is likewise counterclockwise. During the movement of the knife tip 39 the strip drum 1
5 through one of the notches 21 and then impinges on the candy extrudate strand 12 to break the single piece 11 and then to some extent into the notch 22 of the counter drum 16. The knife tip 39 then returns again to the interior of the strip drum 15 in the reverse order and continues this process.

After the single piece 11 is cut from the candy extrudate strand 12, the single piece 11 depends on the peripheral speeds of the strip drum 15 and the counter drum 16, by themselves or by thrusting by the end face of the knife 25. , Will continue to be sent for a few more distances. The single piece 11 is then delivered to a known delivery device or packaging station.

The arrangement and configuration of the transmission 27 are selected so that the major axis 41 of the elliptical movement track 40 lies on the straight line 19 between the strip drum 15 and the counter drum 16. Furthermore, the minor axis 42, which is located at right angles to the major axis 41 of the elliptical motion trajectory 40, is located inside the strip drum 15. The long shaft 41 and the short shaft 42 depend on the diameters of the internal gear 31 and the external gear 34 and the lengths of the cranks 32 and 33 and the eccentric bodies 35 and 38.

An important point for designing the lengths of the long axis 41 and the short axis 42 is that, at the point of impact 44 of the knife tip 39 on the candy extrudate strand 12, the direction of transport of the candy extrudate strand 12 is directed. The value of the knife tip speed vector component VMX that was used is the candy extrudate strand 12
The same or slightly larger than the value of the velocity vector of the transport velocity VBX (FIG. 2) of the above. Furthermore, long axis 4
By appropriately designing the lengths of 1 and the minor axis 42 of the knife 25 in the candy extrudate strand 12 between the point of impact 44 on the candy extrudate strand and the point of exit 46 from the candy extrudate strand. The trajectory curve portion 45 can be brought close to a straight line. Such approaching to a straight line is realized by selecting the major axis 41 to be significantly longer than the minor axis 42. In that case, especially the cutting behavior of the candy extrudate strand 12,
Of course, the transport speed VBX of the candy extrudate strand 12 is taken into consideration.

In order to adapt the apparatus to changing parameters such as changing the extrudate strand thickness D or changing the transport speed VBX of the candy extrudate strand 12, the knife 25 is connected to the tie extrudate link 26. It only has to be moved in a direction perpendicular to the strands 12.

Furthermore, the side of the outlet end 14 of the guide passage 13 facing the counter drum 16 is extended so that this guide passage 13 forms a counter support for the knife 25 at the impact point 44. Ideally, this guide passage 13
Extends over the entire track curve portion 45 to form an opposed support for the knife 25.

Furthermore, instead of the transmission 27 with the planetary gear transmissions 28, 29, the use of a differently formed transmission for producing a movement trajectory similar to at least an elliptical shape of the knife 25. You can Furthermore, the transmission can be arranged, for example, above the guide passage 13 or alongside it.

[Brief description of drawings]

FIG. 1 is a simplified longitudinal cross-sectional view of an apparatus for cutting a single piece according to one embodiment of the present invention.

FIG. 2 is an enlarged detailed view of a part of FIG.

[Explanation of symbols]

10 device, 12 (candy) extrudate strand, 13 guide passage, 14 outlet end, 15 (strip) drum, 16 opposing drum, 17, 18
Shaft, 19 Straight, 21, 22 Notch, 24 Cutting device, 25 Knife, 26 Coupling link, 27
Transmission, 28, 29 Planetary gear transmission, 31
Internal gear, 32, 33 crank, 34 External gear, 35 Eccentric body, 36 Rod, 37 Intermediate link, 38 Eccentric body, 39 Knife tip, 40 Motion trajectory, 41 Long axis, 42 Short axis, 44 Collision point, 45 Orbit curve part, 46 exit points

 ─────────────────────────────────────────────────── ───Continued from the front page (72) Inventor Günter Forster Federal Republic of Germany Pirna Ludwig-Richter-Strasse 15 (72) Inventor Gerd-Reiner Isler Germany Dresden Weiss Bachstraße 3

Claims (10)

[Claims] 1. A device for cutting plastically deformable extrudate strands (12) conveyed at constant speed into single pieces, comprising a sole drum (15) having a movable knife (25). At least one notch (21) cooperating with a knife (25) on the mantle surface of the drum
And a device for producing a motion trajectory similar to at least the elliptical shape of at least the tip of the knife (25) is connected to the knife (25) via a connecting link (26), The movement trajectory (40) of the tip (39) has a focal point (43) located inside the drum (15) and two axes (41, 41) of different lengths.
42), whose first axis (41) projects from the drum (15) by at least a value corresponding to the thickness (D) of the extrudate strands (12), and a movement trajectory The second shaft (42) of (40) is completely drum (1
5) Device for cutting into single pieces, characterized in that it is arranged inside. 2. A first axis (41) of the movement track (40) extends at right angles to the conveying direction (X) of the extrudate strands (12) and a second axis of the movement track (40). Axis (42) is the feed direction (X) of the extrudate strand (12)
The device of claim 1 extending parallel to. 3. A device as claimed in claim 1, wherein the first axis (41) is longer than the second axis (42). 4. The extrudate strand (1) at the point of impact (44) of the knife (25) on the extrudate strand (12).
The knife tip velocity vector component (VMX) oriented in the conveying direction (X) of 2) is the same as or more than the vector of the feed velocity (VBX) of the extrudate strand (12) in the conveying direction (X). 4. Device according to claim 1, wherein the movement trajectory (40) of the tip (39) of the knife (25) is designed to have a slightly larger value. 5. The device (27) for producing at least an elliptical-like movement trajectory (40) comprises two planetary gear transmissions (28, 29) connected to each other by a connecting link (26). 5. A device according to any one of claims 1 to 4, which comprises: 6. The planetary gear transmissions (28, 29) each have a stationary internal gear (31) and an external gear (34) eccentrically supported by a crank (32, 33) inside thereof.
The device according to claim 5, characterized in that the number of teeth of the internal gear (31) is twice the number of teeth of the external gear (34). 7. A first planetary gear transmission (28) is formed to be driven and has a coupling link (2).
7. Device according to claim 5 or 6, comprising an eccentric body (35) rigidly connected to 6). 8. An opposing drum (16) having a relatively small diameter cooperates with the drum (15) to form the drum (1).
8. Extrudate strand (12) is guided between 5) and an opposing drum (16).
Item. 9. The opposing drum (16) is provided with at least one notch (22) and the drum (15).
And the distance between the opposing drum (16) and the extrudate strand (1
Device according to claim 8, corresponding to the thickness (D) of 2). 10. The contact point between the drum (15) and the extrudate strand (12) lies at the first axis (4) of the movement trajectory (40).
1) any one of claims 1 to 9 located above
Item.