초록 ▼

Method and apparatus for controlling a machine which is operable in cycles, the machine carrying out a plurality of functions during each cycle. Values representing the stages of the machine in its cycle are generated as the machine progresses through a cycle, the values being determined by the actu

Method and apparatus for controlling a machine which is operable in cycles, the machine carrying out a plurality of functions during each cycle. Values representing the stages of the machine in its cycle are generated as the machine progresses through a cycle, the values being determined by the actual stage of the machine independently of time. Starting and stopping points in the cycle for at least one of the functions of the machine is preset in terms of the generated values. The generated values are compared with the preset starting and stopping point values. The machine function is initiated and maintained when the generated values are greater than the preset starting point value but are less than the preset stopping point value and the function is stopped when the generated values equal or are greater than the preset stopping point value. Apparatus and method for computing starting and stopping points for an eyespot window using only a single set of delay switches is also disclosed.

대표청구항 ▼

The method of controlling apparatus for sealing packages wherein a web of flexible packaging material having a series of registration marks is formed into tubing and fed past sealing means for sealing the tubing to form packages, comprising: presetting a predetermined delay length of tubing to be fe

The method of controlling apparatus for sealing packages wherein a web of flexible packaging material having a series of registration marks is formed into tubing and fed past sealing means for sealing the tubing to form packages, comprising: presetting a predetermined delay length of tubing to be fed past the sealing means; initiating web feeding; detecting a registration mark; feeding said predetermined delay length past the sealing means in response to said detection of a registration mark before sealing of the tubing, said predetermined delay length being substantially independent of the rate at which packaging material is fed past the sealing means; determining when the predetermined delay length of tubing has passed the sealing means after detection of said registration mark; stopping the feeding of material past the sealing means in response to said predetermined delay length\s having passed the sealing means; actuating the sealing means; and reinitiating feeding of the web.