Cutting – Tool or tool with support – Anvil
Patent
1997-09-30
1999-05-25
Rachuba, M.
Cutting
Tool or tool with support
Anvil
83346, 8369842, B26D 720
Patent
active
059061499
DESCRIPTION:
BRIEF SUMMARY
OBJECT OF THE INVENTION
The present invention, as expressed in the statement of this Specification, refers to an anvil for rotary slotting and cutting machines, which obtains the transformation of the cardboard plates for the fabrication of boxes and packages.
The machinery used for the fabrication of cardboard packages, parting from plates, are called transforming machines and one of their main characteristics is that of conducting the necessary cuts and marking of the bends on the cardboard plates, which permit the forming of the box or package.
In all cases, said machines have a part in common which incorporates the necessary elements for cutting and slitting cardboard (knife heads, dies, etc.) and another part, which acts as anvil or support of the cardboard plate and which offers the neccessary consistency so as to produce the cut or marking of the slit. In order to understand well this task, it is compared with a butcher's knife and wooden block which is used as support on which the knife, after cutting the meat embeds into the wood. This wood, with anvil or backing functions gave, in the first place, consistency to the piece of meat to be cut, and secondly, the knife penetrated the wood, without thus damaging its edge.
The process for cutting the cardboard plates and marking them for the forming of packages, is called slotting or cutting. The machines which normally conduct this, may be designed for working with said cardboard cutting and slitting elements, of flat shape (die or knife distributed over a flat surface which works against an also flat anvil), or else, the configuration of die and arrangement of the knives is performed on the surface which develops a cylinder, and in this case, it is designed in cylindrical shape or as a ring.
As described in the previous paragraph, the different types of machines for handling the cardboard, may be classified in three following groups:
A fundamental difference between said types of machines is the arrangement of the knives and the anvil. In the flat cutting machine, they are placed on two flat and parallel surfaces, whilst with the remaining groups, the cutting elements form several cylinders which work against the anvils, also cylindrical. Said arrangement of both elements, forced the anvils to be also different as regards their mechanical characteristics, up to the present.
Due to the accuracy permitted by the construction of the flat die, a surface for the rigid material anvil (steel) is used in said machines, whereas in the rotary die and versus the unfeasibility of having dies available with said accuracy, the use of supports or soft material anvils is resorted to, which counteract the difficulties of the rotary die.
This characteristic of the soft material anvil or support in slotting machines and in rotary cutting machines, forced machine manufacturers, during many years who were users and suppliers of anvils, to search for solutions which would permit the satisfaction of the requirements of all, and thus to achieve that the rotary die made use of its high productivity advantages, improving at the same time, the quality of the finished product.
Since it involves a soft and elastic material into which the die or slotting knives penetrate, it signifies that said parts wear rapidly, which obliges their frequent replacement. If said changing operation is conducted with the correct frequency, the result of the machine is satisfactory, though this situation is not normally produced due to different reasons which shall be commented herewith.
It is at this point, where, according to the invention, a new design for anvils or supports for rotary slotting and cutting machines is offered, which permit that the notable charactistical advantages of the present invention are reached.
The cylindrical anvil is formed by a series of bushes or rings placed in juxtaposition until they reach the total length of the support cylinder. Said assembly of bushes or partial anvils, may be installed in two different modalities: exists inside the bush, a key which is inserte
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Pryor Sean
Rachuba M.
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