Plastic article or earthenware shaping or treating: apparatus – Preform severing means – Means forming from bulk and downstream severing means
Patent
1986-11-26
1988-04-26
Hart, Charles
Plastic article or earthenware shaping or treating: apparatus
Preform severing means
Means forming from bulk and downstream severing means
83319, 264148, 425315, B28B 714
Patent
active
047401494
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for cutting into pieces of predetermined length strings of material by means of a rotary saw blade, said strings being conveyed intermittently and at irregular speed.
In cutting moving strings of material it is common to run a saw blade crosswise through the string, the travel path of the saw blade in relation to the string forming an angle which diverges slightly from the angle under which the string is to be cut. In this way the movement of the string during the cutting is compensated for. However, this commonly known technique cannot be applied when the material is not conveyed at regular speed, as the angle of the travel path of the saw blade is varying in a way which cannot be predicted.
It is the object of the present invention to produce an apparatus capable of solving this task, which task also comprises reducing the need for space on the three sides of the string material.
According to the invention this purpose is achieved by means of the features stated in claim 1. By mounting the saw blade and its transmission on a lever, the axis of rotation of which is situated at a distance from the place of cutting, the lever and the saw blade are brought to follow the movement of the material during the cutting under a very limited variation of angle. The lever comprises a gripping device which ensures that the saw blade is exactly following the string of material during cutting which is performed by the transmission being displaced relative to the lever. The apparatus does in fact grip around the string, but does not comprise space demanding devices on the three sides thereof, only on the fourth side, viz. the lever which extends at almost right angle to the string.
According to the invention it is advantageous that the gripping device comprises one part being stationary in relation to the lever and another part being movable and attached to the transmission and being displaceable against a spring load with respect to the transmission. Thereby, an automatic activation of the gripper device is attained at the beginning of the feeding or cutting movement of the saw blade, and the gripper device will remain activated until the saw blade-after termination of the cutting process is brought out of contact with the string of material.
In a preferred embodiment according to the invention a gauge is positioned on the lever, said gauge being adjustable to the desired length and being placed in the path of movement of the string material, an activation means being arranged in connection with the lever capable of starting the travel moment of the saw blade when the lever is moved caused by the string of material engaging the gauge.
The invention further comprises the use of the apparatus according to claim 1 in cutting pieces having a predetermined length from frozen food in the form of strings which are extruded from neighbouring openings in an extruder nozzle. In use, the extruded strings are made to form an acute angle with the extension of the extruder axis, a cutting device being placed by each string in circle around the extension of the extruder axis. In this way the problems in cutting the extruded strings of material fed at differing and irregular speed are solved. Due to the small demand for space at the three sides of the cutting devices, there will be no difficulty in arranging the apparatuses side by side in a circle even if for instance 10 or more strings are to be extruded simultaneously.
In the following the invention will be explained with reference to the embodiments shown in the drawing. In the drawing
FIG. 1 shows the cutting apparatus according to the invention, in side elevation, and
FIG. 2 shows a use in accordance with the invention of the cutting apparatuses in connection with an extruder for the production of frozen food.
The cutting apparatus 1 shown in FIG. 1 is adapted for cutting pieces of a predetermined length from a string of material 2. The strings of material 2 are conveyed intermittently and at irregular speed in the direction of the ar
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Atlas Danmark A/S
Hart Charles
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