Package making – Apparatus for forming or partially forming receptacle and... – Forming by opening or setting up collapsed receptacle
Patent
1986-06-23
1987-12-08
Coan, James F.
Package making
Apparatus for forming or partially forming receptacle and...
Forming by opening or setting up collapsed receptacle
53459, B65B 4330
Patent
active
047110708
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention pertains to improvements to machines for packaging powdered products into valve bags.
Bags of this sort equipped with valves are generally placed flat in verticle or horizontal piles.
For automatic packaging of powdered products, it is usually necessary to open the valve of the bag located at the top of the pile, hold said bag and move it, with the valve open, from the storage area where the pile is located to a filling and weighing station comprising a distributor tube over which said valve must be placed.
Up to now, these operations were performed by applying, during their entire duration, a suction to the top of the first bag on the pile, using suction cups.
Experience has shown, however, that a certain percentage of valves did not open or opened incompletely, and that these bags were dropped, so that the operation of the packaging installation was defective.
It has been noted that this sometimes high percentage of failures was due in large measure to the shocks created in the bag-handling head by insufficient sophisticated design of the pneumatic control circuits and by inertia effects in the moving parts constituting the bag-grasping head subassembly.
SUMMARY OF THE INVENTION
The present invention overcomes these drawbacks by providing an apparatus and method for reducing the jerking motion of a cylinder subassembly.
Briefly, the present invention comprises a machine having a fixed portion and fitted with at least one pneumatic cylinder and piston which is activated by a nominal-pressure supply and forms part of a subassembly which is movable with respect to the machine. There is a counter-pressure system for each working phase of the subassembly cylinder, including means for counteracting the nominal-pressure supply to reduce jerking movements of the subassembly during operation. Also a speed control unit which has a variable throttling valve and an anti-return valve is affixed to the fixed portion of the machine separated from the movable subassembly. Flexible lines are connected between the subassembly cylinder and the control unit so that the mass of the movable subassembly is reduced to further reduce the jerking motion of the subassembly.
The invention also relates to a method of reducing the jerking movements of a valve bag bagging machine having a fixed portion and having at least one movable pneumatic cylinder and piston for effectuating movement using a first air supply pressure. The method comprises the steps of producing a second air supply at a pressure lower than the first air supply pressure, providing the first air supply pressure to one face of the piston and the second air supply pressure to the opposite face of the piston for initiating movement of the piston in the direction of the second face, providing the second pressure to both sides of the piston to slow the movement of the piston near the end of travel in the cylinder, progressively relieving pressure from the second side of the piston to permit travel of the piston to a given stop position, providing the first pressure to the second face of the piston after a time delay for initiating movement of the piston in the direction of the first face, and minimizing the mass of components attached to the piston for movement thereby.
BRIEF DESCRIPTION OF THE DRAWINGS
The attached figures also present the various characteristics and advantages of the invention and in which:
FIGS. 1a-f are a series of views showing the six phases of the movements of a bag-placer mechanism,
FIG. 1a is a perspective view of the stacked bags,
FIG. 1b is a perspective view showing the top valve bag being grasped,
FIG. 1c is a side view of a grasping head grasping a bag for opening,
FIG. 1d is a perspective view of a grasping head moving a bag to a position for filling,
FIG. 1e is a side view of the grasping head holding a bag in position for filling,
FIG. 1f is a perspective view of the grasping head returned for grasping another bag as a filled bag is removed,
FIG. 2 is a perspective view of the component p
REFERENCES:
patent: 3830038 (1974-08-01), Propst
patent: 3884278 (1975-05-01), Nakashima
patent: 4411296 (1983-10-01), Durant
patent: 4561238 (1985-12-01), Odom
Dupasquier Guy
Massa Andre
Atochem
Coan James F.
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