Abstract: A sealing machine adapted to support a plurality of different heating/sealing/cutting mechanisms, including tubular heaters and heated cutting blades, is disclosed. The sealing machine utilizes a common interface and mounting system for all side sealers. In addition, in some embodiments, the control system within the sealing machine is adapted to monitor and control the temperature of these various mechanisms automatically so as to create proper seals.

Abstract: A tubular heating element which is resistant to damage caused by foreign material is disclosed. The tubular heating element is pivotably attached to the side sealing machine at its leading (upstream) edge. The trailing (downstream) edge of the tubular heating element is moved by means of a compressible force, such as an air cylinder. In this way, the air in the cylinder pushes the tubular heating element downward into the plane of the film. However, a foreign object located on the film can overcome the force of the air cylinder, thereby lifting the tubular heating element out of the path of the film.

Abstract: The problems associated with the prior art have been overcome by the present invention, which describes a tubular heating element having a more reliable and accurate temperature monitoring system. The tubular heating element has a thermocouple attached to its exterior surface, in close proximity to the cutting and sealing portion of the tubular heating element. In addition to improving the accuracy of the temperature measurement, this technique reduces electromagnetic interference caused by the interaction between the heating wire and the thermocouple.

Abstract: The present invention describes an improved side-sealing machine for use with heat sealable films. Briefly, a cutting and sealing element is located between a set of cooperating guide and alignment members. The downstream guide and alignment member also includes a compression mechanism. This compression mechanism serves to compress the seal created upstream, and to draw the heat away from the film. In some embodiments, the downstream guide and alignment member also serves to separate the film into a surplus portion and a remaining portion, where only the remaining portion is subjected to compression.

Abstract: A tubular heating element which is resistant to damage caused by foreign material is disclosed. The tubular heating element is pivotably attached to the side sealing machine at its leading (upstream) edge. The trailing (downstream) edge of the tubular heating element is moved by means of a compressible force, such as an air cylinder. In this way, the air in the cylinder pushes the tubular heating element downward into the plane of the film. However, a foreign object located on the film can overcome the force of the air cylinder, thereby lifting the tubular heating element out of the path of the film.

Abstract: A sealing machine adapted to support a plurality of different heating/sealing/cutting mechanisms, including tubular heaters and heated cutting blades, is disclosed. The sealing machine utilizes a common interface and mounting system for all side sealers. In addition, in some embodiments, the control system within the sealing machine is adapted to monitor and control the temperature of these various mechanisms automatically so as to create proper seals.

Abstract: The present invention describes an improved side-sealing machine for use with heat sealable films. Briefly, a cutting and sealing element is located between a set of cooperating guide and alignment members. The downstream guide and alignment member also includes a compression mechanism. This compression mechanism serves to compress the seal created upstream, and to draw the heat away from the film. In some embodiments, the downstream guide and alignment member also serves to separate the film into a surplus portion and a remaining portion, where only the remaining portion is subjected to compression.

Abstract: The present invention describes an improved grip belt drive system for use in sealing machines used to wrap articles in thermoplastic film. Briefly, a timing belt is used in place of the traditional flat or V belt. The presence of teeth on the pulleys, coupled with the use of a timing belt eliminates the possibility of slippage between the belt and the pulleys. To protect the system in the case of a film jam or misplaced article, a torque-limiting mechanism is included, which disengages the drive system if there is excessive counterforce. Furthermore, the outer surface of timing belt contains a pattern, which when mated with a second belt having the same or a complementary pattern, meshes in such a way so that the two belts are positively locked in both the longitudinal and transverse directions.

Abstract: The present invention describes a blade assembly for use with side-sealing and lap-sealing machines, which are used to seal thermoplastic film. Briefly, the cutting element is oval in shape, and has its entire outer edge profiled. This provides four distinct cutting surfaces, depending on the mounting orientation of the cutting element in the machine. This cutting element is held against a heating block, and its temperature is continuously monitored by a temperature sensor. The sensor is spring-loaded to insure solid contact with the cutting element, and thus, accurate temperature measurements. This entire assembly is then encased in insulation. Additionally, the cutting element is mounted on an adjustable platform, which permits vertical adjustments relative to the film. Thus, the specific portion of the cutting element which actually engages the film can be adjusted to improve the cutting quality or further extend the useful life of the cutting element.

Abstract: Control system and apparatus for controlling current input to an electrical resistance element such as a seal wire. The system and apparatus of the present invention is a closed loop feedback modification to conventional systems, and takes advantage of the inherent expansion of the seal wire as it is heated. The feedback mechanism monitors both the actual current passing through the wire, and the length of the sealing wire, and adjusts the current applied to the wire, responsive to those monitored inputs. The usage of the sealing machine is also monitored and the application and amount of current flowing to the wire is varied based on this usage.

Abstract: Apparatus for the automatic packaging of one or more articles. One or more modular infeed systems are provided, each adapted to feed product to a wrapping machine, and each preferably adapted to communicate with a wrapping machine to identify its configuration to the wrapping machine. In a preferred embodiment, each modular infeed includes a film roll unwind assembly, an integrated film folding head, a product conveyance mechanism and a closed-loop communications network.

Abstract: Control system and apparatus for controlling current input to an electrical resistance element such as a seal wire. The system and apparatus of the present invention is a closed loop feedback modification to conventional systems, and takes advantage of the inherent expansion of the seal wire as it is heated. The feedback mechanism monitors the length of the sealing wire, and adjusts the current applied to the wire, responsive to that monitored length.

Abstract: Apparatus and method for the automatic packaging of one or more articles. An adjustable web guide structure that guides the webs of film into a configuration that mimics the geometry of a package to be wrapped is provided. The webs are conveyed over the guide structure, which structure provides an appropriate predetermined shape defining a web envelope for proper package entry and flow through the wrapping system. The position and geometry of the guides causes the web envelope to form around the corners of the product to be package to minimize film requirement, and allows for fluid transition from web supply rolls to package shape. External tension rods can be used to assist in preventing or minimizing web wrinkling. Guide rolls can be used in conjunction with the guide structure to assist in guiding and tracking the web material, as well as to provide axial transverse tension for proper web forming.

Abstract: Control system and apparatus for controlling current input to an electrical resistance element such as a seal wire. The system and apparatus of the present invention is a closed loop feedback modification to conventional systems, and takes advantage of the inherent expansion of the seal wire as it is heated. When the seal wire expands to a predetermined length, a switch is triggered which interrupts at least a portion of the power supplied to the wire for heating. The interruption continues until the wire contracts to a length less than the predetermined length, whereupon the interruption ceases and heating of the wire resumes normal operation.

Abstract: An operating mechanism for the seal jaw in a package wrapping machine has an operating arm with means along its length to alter the length of the arm between two finite positions. The arrangement is such that the operating arm for the sealing jaw in the package wrapping machine can be controlled so that it can open to a higher position for large packages and yet also open to a shorter position for less high packages, thus, speeding up the operation of the machine so that it can accept a greater number of packages for any given length of time.

Abstract: A seal wire heat control system for sealing thermoplastic film as adapted to control the duration of heat impulses applied to the sealing wire by remembering the past history of the sealing machine. The application of power to the sealing wire is provided by a series of power impulses, the duration of which is shortened incrementally as the apparatus continues to run and is lengthened incrementally when the apparatus sits at rest.

Abstract: A seal wire heat control system adapted to record in memory the immediate history of the operation of the seal wire and to adjust the time duration of the application of voltage to the seal wire in accordance with a predetermined program. The application of heat is controlled according to the running history of the machine. At start up, a relatively long pulse of power is sent through the wire to make a seal for a predetermined number of times. When the count is reached, an intermediate pulse is provided to the wire for a predetermined number of times. When this count is reached, a short pulse is provided to the wire. A reset timer monitors idle time. If no seal is executed after a predetermined time, the entire system, including counters, resets to prepare for delivery of a long pulse to the wire. A safety timer is also provided for limiting the duration of power to the wire within the wire's safety threshold value.

Abstract: A sealing jaw apparatus for a plastic film wrapping machine has essentially spaced heated sealing jaws with a reciprocal knife located therebetween. The jaws operate against a heated elastomeric bed that has a longitudinal slot to receive the knife during the cutting operation. The arrangement provides a sealing of thermoplastic film and a severing thereof at a considerably lower temperature then the melting point of the film.

Abstract: A controlled product feed system for delivering discrete products at high speed to a downstream industrial operation which requires accurate speed and position of delivery. A retarding force is applied to the product stream to accumulate an abutting sequence of products with means controlling the rate of package release to correspond to the downstream operation and timing the release to obtain a predetermined phase of arrival of products at the point of delivery.

Abstract: A form fill seal type wrapping machine uses equal speed conveyors which are start/stop controlled to accept randomly fed packages and uniformly space them for wrapping and sealing in a roll fed wrapping material such as thermoplastic film. Different length packages can be wrapped without adjustment. One embodiment uses a traveling transverse seal mechanism so the machine can run continuously. Machine speed is enhanced by controlling dwell time for the transverse seal and time of travel for the transverse seal mechanism to be no longer than required to make the seal. A fast return mechanism for the transverse seal mechanism operates at a speed independent of machine speed.