Web butt-joining system
First Claim
Patent Images
1. A method of butt-joining comprising the steps of:
- feeding a pair of webs to be joined into a cutting and joining section having cutting and joining drums operable by the selective driving of a D.C. motor,overlapping and cutting said pair of webs on said cutting drums,butting and joining the ends of said cut webs,controlling the rotational speed of said D.C. motor during said cutting and joining steps in response to a signal indicating both the web running speed and the relative positions between the drums and webs such that the running speed of said webs corresponds to the circumferential speed of said cutting and joining drums during the cutting and joining steps, andstopping said cutting and joining drums at predetermined positions following completion of the cutting and joining steps.
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Abstract
A web butt-joining system having a feeding section with rolls for feeding a pair of new and old webs, a cutting and joining section having cutting drums and joining drums, and a drive control section. The latter is composed of a driving DC motor commonly coupled to the cutting drums and joining drums. A calculation control circuit drives the DC motor and drive control section is operated to cut said new and old webs fed from said feeding section and piled one on another with said cutting drums and to butt-join the ends of said webs thus cut with bonding tapes provided on said joining drums.
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Citations
19 Claims
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1. A method of butt-joining comprising the steps of:
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feeding a pair of webs to be joined into a cutting and joining section having cutting and joining drums operable by the selective driving of a D.C. motor, overlapping and cutting said pair of webs on said cutting drums, butting and joining the ends of said cut webs, controlling the rotational speed of said D.C. motor during said cutting and joining steps in response to a signal indicating both the web running speed and the relative positions between the drums and webs such that the running speed of said webs corresponds to the circumferential speed of said cutting and joining drums during the cutting and joining steps, and stopping said cutting and joining drums at predetermined positions following completion of the cutting and joining steps. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of web butt-joining comprising the steps of feeding a pair of new and old webs from a feeding section having rolls to a cutting and joining section having cutting drums and joining drums;
- controlling a DC motor coupled commonly to the cutting drums and joining drums by a calculation control circuit for said driving DC motor;
cutting said new and old webs fed from said feeding section and overlapping one on another with said cutting drums; and
butt-joining the ends of said webs thus cut with bonding tapes provided on said joining drums;
wherein the step of controlling a D.C. motor includes are steps of, generating a number of pulses corresponding to a length L-Co where L is the web length from a web cutting position to a desired web cutting position and Co is the circumferential length of each cutting drum from a stop position of said cutting drum to the web cutting position, generating a number of first pulses corresponding to web movement and a number of second pulses corresponding to a circumferential movement length of each of said cutting and joining drums to obtain ∫
φ
A dt and ∫
φ
B dt, respectively, wherein φ
A are pulses indicative of unit length movements of said web and φ
B are pulses indicative of corresponding unitary lengths of circumferential drum travel calculating an output value R=L-Co-∫
φ
A dt+∫
φ
B dt as said old web is forwarded, converting said output value R into a positive or negative DC voltage value and adding to a DC voltage corresponding to a web running speed to obtain a sum so that said drums are rotated according to said sum, generating after completion of web cutting and joining operations a number of pulses Co'"'"' corresponding to a circumferential length of each drum from a joining completion position thereof to a stop position thereof and a number of pulses ∫
φ
B dt corresponding to a circumferential movement length of each drum when rotated forwardly, calculating R'"'"'=Co'"'"'-∫
φ
B dt and converting into a DC voltage signal to stop each drum at a stop position thereof, whereby when the web running speed coincides with the circumferential speed of said cutting drums such that the difference therebetween is zero, web cutting is carried out, and when the web running speed coincides with the circumferential speed of said joining drum such that the difference therebetween is zero, web joining is carried out, and that after completion of the cutting and joining operations said cutting drums and said joining drums are restored to predetermined positions thereof and stopped.
- controlling a DC motor coupled commonly to the cutting drums and joining drums by a calculation control circuit for said driving DC motor;
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9. A web butt-joining system comprising:
a feeding section having rolls for feeding a pair of new and old webs, a cutting and joining section having cutting drums and joining drums, a drive control section having a driving D.C. motor commonly coupled to said cutting drums and joining drums and a calculation control circuit for selectively controlling said driving D.C. motor in response to signals indicative of both the running speed of said old web and the positional relationship between said old web and said cutting and joining drums, said drive control section being operated to cut said new and old webs fed from said feeding section with said cutting drums and to butt-join the ends of said webs thus cut with bonding tapes provided on said joining drums. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
Specification