Turning – Severing or cut-off – Flying cutter type
Patent
1987-12-28
1990-06-19
Schmidt, Frederick R.
Turning
Severing or cut-off
Flying cutter type
82101, 82102, 83318, B26D 160
Patent
active
049342258
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for cutting a continuously manufactured tube and more particularly for a cardboard tube manufactured by means of a machine known as a "spiralling" machine.
It is known to manufacture cardboard tubes in a continuous manner by means of e.g., a "spiralling" machine (designed to spirally roll strips of paper on a mandrel).
It is also known to cut the tube during its manufacture and a particularly interesting cutting device is described in patent FR-2545752 by the same applicant.
The prior device comprises a knife-holder carriage mounted movable in translation and which is driven by the end of the tube itself by means of an abutment mechanically linked to the carriage so that the carriage is in perfect synchronic movement with the raveling of the tube (which is necessary at the moment of cutting), means being provided for returning the carriage to its initial position.
Further, cam systems make it possible to drive the knives during the movement of the knife-holder carriage.
This device which is known nevertheless presents some limits.
In effect, the forward and return cycle time of the carriage corresponding to one cut is significant, which limits allowed minimal lengths.
The driving of the carriage by the end section of the tube limits the minimal possible thickness of the tube (deterioration of the section for too weak thickness).
The installation and adjustment of the driving abutment of the carriage should the desired length for each piece be changed requires a mandatory halting of the machine and therefore a loss of time as well as a waste.
This is why the inventor imagined a device which is much more flexible and more effective nevertheless retaking up the principal of a knife-holding carriage, e.g., of the type previously mentioned.
The device according to the invention is noteworthy in that the carriage is moved by a driving mechanism which is activated by a first rotating motor serving in rotation the raveling speed of the tube and by means of a first clutch system which is guided by a section length determining device to be obtained, so as to control the clutch function of said system after each sectioning and based on said desired lengths.
It is obvious that such a device makes it possible to solve the dual problem, on the one hand, of synchronism between the movement speed of the knife-holding carriage and the raveling speed of the tube and, on the other hand, the determining section lengths.
Using mechanical means to drive the movement of the carriage makes it possible to have more sudden starts and therefore to reduce the duration of each cutting cycle and even to reduce minimal possible lengths while the guiding of the clutch system of a section length determining device permits a great flexibility of work by programming or modifying said lengths during the very manufacture of the tube.
According to one possibility, the clutch system is disengaged during penetration of the knives in the side of the tube at least until said knives cease their cutting action so that the carriage and its mechanism are driven during this time by the tube itself which is in gear with said knives.
The driving mechanism is, for example, a rod-crank type and comprises one rod whose foot is journalled onto the carriage and whose head is in gear with the turning arm of the clutch system.
Nevertheless it is perfectly obvious that it is also possible to use other conventional means such as e.g., a groove instead of the rod, said groove being affixed to a sliding shaft capable of driving the knife-holder carriage.
Without it being strictly mandatory (the motor and clutch system mentioned above being sufficient), but in order to reduce the cutting cycle time and therefore to allow for cutting shorter sections as mentioned above, the means for returning the carriage to its original position further comprise a return mechanism which acts at the end of each cutting while the clutch system is disengaged. The return mechanism mentioned above is for example formed by one or a plurality of pneumatic
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Languillat Jean-Paul
Raval Patrick
Lhomme S. A.
Schmidt Frederick R.
Shideler Blynn
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