CA1193235A - Roll drive control apparatus - Google Patents
Roll drive control apparatusInfo
- Publication number
- CA1193235A CA1193235A CA000418146A CA418146A CA1193235A CA 1193235 A CA1193235 A CA 1193235A CA 000418146 A CA000418146 A CA 000418146A CA 418146 A CA418146 A CA 418146A CA 1193235 A CA1193235 A CA 1193235A
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- CA
- Canada
- Prior art keywords
- roll
- frame
- motor
- feed roll
- gear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Abstract
ABSTRACT
A roll drive apparatus for driving a continuous length of material upon demand, from a feed roll and winding that material onto a take-up roll comprising a frame; a driven rotating feed roll mounted on the frame; a driven rotating take-up roll mounted on the frame at a distance from said feed roll; a spring loaded counterweighted displaceable dancer rod having a zero position and a maximum position contacting said material at a point between said feed roll and said take-up roll and adapted for being displaced between said zero position and said maximum position by tension changes of said material; a first variable speed motor means mounted on said frame and connected to said feed roll for rotating said feed roll;
a second variable speed motor means mounted on said frame and connected to said take-up roll for rotating said take-up roll; and a dancer rod displace-ment sensing means connected to said dancer rod and said first motor means and mounted on said frame and adapted for continuously adjusting the speed of said first motor means is disclosed.
A roll drive apparatus for driving a continuous length of material upon demand, from a feed roll and winding that material onto a take-up roll comprising a frame; a driven rotating feed roll mounted on the frame; a driven rotating take-up roll mounted on the frame at a distance from said feed roll; a spring loaded counterweighted displaceable dancer rod having a zero position and a maximum position contacting said material at a point between said feed roll and said take-up roll and adapted for being displaced between said zero position and said maximum position by tension changes of said material; a first variable speed motor means mounted on said frame and connected to said feed roll for rotating said feed roll;
a second variable speed motor means mounted on said frame and connected to said take-up roll for rotating said take-up roll; and a dancer rod displace-ment sensing means connected to said dancer rod and said first motor means and mounted on said frame and adapted for continuously adjusting the speed of said first motor means is disclosed.
Description
~33~3~
This invention is directed principally, but not exclusively, to collators for assembling a plurality of paper webs and carbon or transfer webs into continuous business forms.
As applied to collating machines, one of the disadvantages of present systems, where a continuous sheet or form is being transferred from a feed roll to another roll, is the necessity for constant adjustments to compensate for web tension or roll speed. Furthermore, in any system which can only feed stock by pulling, whether the stock be paper, polythene, or any other material, it is impossible to run at zero tension. As will be appreciated, the force required to pull stock from a large roll varies from that which is required with a small roll. This analogy also applies to braking and stopping large and small rolls.
Individual rolls may also vary from one another in size, density and strength, and again in prior systems it is generally left to the operator to make the various individual adjustments.
Consequently there is a need for a drive system which would en-able an operator to pre-set a tension for each roll of stock, and preferably not have to make any further adjustments, other than when the rolls require changing, for tension, braking or speed, unless different tensions are required to compensate for problems such as short or long sheet length, or different types of stock e.g. polythene. With such a system, even if ad-justment of tension was required, it would be preferable if no additional adjustments were required for brak;ng or speed.
As indicated above, prior systems which can only feed stock by pulling, render it impossible to run at zero tension, however, with the 3~3 ~ S
present invention to be described, rolls are driven through the core, thus making it possible to adjust toward zero tension.
The primary object of the disclosed invention is to provide a means for driving a roll of stock which will supply upon demand a continu-ous sheet, at an automatic~ constantly adjusted speed, and at a pre-set tension.
An additional object of the disclosed invention is to provide a means for sensing speed changess or tension changes, of the materials and to adjust the s~eed of the drive roll.
Yet a further object of the disclosed invention is to provide a spring loaded counterweighted displaceable dancer rod for sensing the speed changes of the materials.
Still another object of the disclosed invention is to provide a large diameter gear mounted to the dancer rod and in contact with a small diameter gear connected to a potentiometer for adjusting the speed of the motor.
Yet another object of the disclosed invention is to provide a dancer rod which has a displaceable counte~eight so that the dancer as-sembly may be balanced. This aids sensing of only the web and spring tension (and excludes the weight of the dancer assembly).
Yet another object of the disclosed invention is to provide a compact displacement sensing means mounted some distance from the frame for sensing the displacement of the dancer rod and adjusting the motor speed thereby.
Yet another object of the disclosed invention is to provide a ~ 2 --~ ~3 ~3`;~3~i sensing means for sensing the changes in diameter of a roll of stock and adjusting the speed of the roll drive motor accordingly.
These and other objects and advantages of the invention will be readily apparent in view of the following description and drawings of the above described invention.
The above and other objects and advantages and novel features of the present invention will become apparent From the following detailed description of the preferred embodiment of the invention illustrated in the accompanying drawings, wherein:
Figure 1 is a front elevational view of a converter showing a feed roll of, for example polyethylene, a feed roll of, for example paper, and a take-up roll for the joined materials;
Figure 2 is a rear elevational view of the mechanism of Figure 1 showing the motor drive means driving the rolls and the tension sensing means;
Figure 3 is a fragmentary perspective view of the dancer rod shwoing its spring loading and counterweighting;
Figure 4 is an expanded view of the tension sensing and adjust-ing mechanism of Figure 2;
Figure 5 i5 a fragmentary perspective view of the motor and worm gear reducer for driving the rolls, Figure 6 is an elementary block diagram of the control circuit;
Figure 7 is a fragmentary cross-sectional view of the dancer rod and sensing mechanism mounted on the frame, Figure 8 is a different embodiment of Figure 1;
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Figure 9 is a plan view of a roll d-iameter sensing device Form-ing part of the invention;
Figure 10 is a sectional elevation of the device according to Figure 9.
Referring now to Figure 1, a frame F for mounting the necessary rolls and mechanisms is shown. The frame F has a -front side and a rear side the front side being shown in Figure 1.
A polyethylene feed roll 10 having a continuous strip of poly-ethylene 12 is shown mounted on the front side of frame F. A paper feed roll 14 for holding a continuous strip of paper 16 is shown opposite poly-ethylene feed roll 10. Operating means for joining, or otherwise performing work on the polyethylene strip 12 and the paper strip 16 are shown at 18. A
take-up roll 20 for winding the joined polyethylene 10 and paper 16 is shown, however, the subject invention is not limited to such a specific take-up system.
Although for the purpose of this description a polyethylene feed roll 10 and a paper feed roll 14 are disclosed, it should be evident that in practice a collator can utilize many rolls and a variety of materials.
A dancer rod 22, as best shown in Figure 3, is provided For each of the rolls 10 and 14 of Figure 1.
A d~ncer rod 22 is comprised generally of a pair of arms 24 and 26 connected by rod 28 and shaft 30. Rod 28 rotates on pins 32 which are positioned and fastened at 34 through arms 24 and 26.
A collar 38, having bearings 39 and races 39A, is bolted to Frame F by bolts 40. Shaft 30 extends through frame F and aperture H
located in collar 38 and frame F. Shaft 30 connects arms 24 and 26 and is maintained in position by key 42 mounted in key slot 44 of arm 26. Races 39A are maintained in position by retaining rings ~1 and 41A. Spacer ring 43 is concentrically mounted adjacent retaining ring 41A.
A counterweight 46 is displaceably mounted on shaft 48 mounted in arm 24. The counterweight is displaceable over the length of shaft 48 for balancing the dancer assembly.
Spring 50 is connected to arm 24 and frame F for maintaining positive tension on dancer rod 22. While a tension spring 50 is shown the arrangement could satisfactorily utilize a torsion spring.
Referring again to Figure 1 it can be seen that polyethylene strip 12 proceeds from polyethylene feed roll 10 to roller 52, around roller 52 to dancer rod 22 and to additional rollers 54 and 56. Paper strip 16 of paper feed roll 14 advances from roller 58 to a second dancer rod 22 and then to rollers 60 and 62.
Polyethylene strip 12 and paper strip 16 are joined by joining means 18 and then advanced via roller 64, to be wound around driven take-up roll 20.
Referring now to Figure 2, the rear side o-f frame F is shown.
The drive means D for driving the rolls 10 20 and 14 are best shown in Figure 5.
A motor M is connected to worm gear drive W which is connected to a bearing housing S which passes through frame F and is drivingly connec-ted to the rolls 109 14 and 20. A direct current motor is disclosed9 although any other suitable adjustable speed motor is possible. The worm , ~
~3~35 gear drive W may have a sufficiently steep gear ration to make it self locking. Without input torque from the motor M the worm gear drive W
requires such high torque to turn that it is almost impossible for the rolls lO, 14 and 20 to turn if the motors M are not providing input torque to worm gear drive W. Worm gear drive W also aids in maintaining a stable tension in the material feed and as indicated above, may be provided with a self~locking feature whereby any time the motor power is cut-off~ the roll drive has to stop. This can also be accomplished by the use of dynamic braking on the motor itself.
The dancer rod displacement sensing means is best shown in Figure 4.
Collar 68 having bearings 69 and races 69A is mounted concentric with shaft 30 and held in place by bolts 40 used for mounting collar 38 to frame F. Races 69A are held in position by retaining rings 71 and 71A.
Shaft 30 passes through frame F and aperture H and sleeve C and connected with toothed gear 70 mounted on collar 68. Gear 70 is connected to shaft 30 by cap screw 72 so that any displacement of dancer rod 22 will cause shaft 30 to turn and thereby cause gear 70 to turn. Gear 70 has a number of teeth 74 located about its circumference for meshing with teeth 76 of gear 78. Gear 78 is connected to gear-adjustable potentiometer 80 for adjusting the output signal to motor M by means of wires 32 connecting potentiometer 80 to isolation amplification module 88. Potentiometer 80 is mounted on bracket B affixed to frame F so that gear 78 will be capable of meshing with the teeth of gear 70. As best seen in Figure 2? it can be seen that each ~$~3~
roll 10, 14 and 20 has its own motor M and worm gear drive W or drive means D. Likewise, each roll 10 and 14 has its own dancer rod 22 as well as dis-placement sensing means A for continuously adjusting the speed of the appropriate motor M.
The motor M may be connected to a reversing and logic module 84, as best shown in Figure 6, which is connected to the output side of motor controller 86. Motor controller 86 may be connected to isolation amplifica-tion module 88 and proportioning feed back transducer or potentiometer 80.
In this way, the speed of motor M may be controlled by the potentiometer 80 of displacement sensing means A.
A roll 10 of polyethylene strip 12 and a roll 14 of paper 16 are mounted in frame F. The polyethylene strip 12 and the paper strip 16 are wound through the appropriate rollers and dancer rods until coming together at operating or joining means 18. The ioined strip then exists from joining means 18 and passes by the appropriate rollers and dancer rods to be wound about take-up roll 20.
Due to the relative thickness differences of the polyethylene strip 12 and the paper backing 16, the angular speed of rotation o-f rolls 10 and 14 changes as the diameter of the material 12 and 16 on the rolls 10 and 14 respectively, changes due to the polyethylene 10 and paper 16 being driven from their respective rolls. Because the polyethylene 10 and the paper 16 have different thichnesses their wound diameters diminish at dif-ferent rates. Consequently, i-f their speeds of removal from the rolls are to be as initially set, then the motors M driving the respective rolls 10 and 14 must be adjusted independently of each other. To facilitate this 3~
adjustment, reference is made to Figures 9 and 10 which show separate sensing means 89 operable to sense the decreasing dimensions of the rolls of material.
Figure 9 shows the sensing means 89 mounted in close proximity to, For example, roll 14. Sensing means 89 comprises in this particular embodiment, in an assembly shown in part section in Figure 10, which includes:- a right angle mounting bracket 90 attached by cap screws 91 to frame F; a mounting plate 92 is adjustably mounted to bracket 90 by cap screws 93. Mounting plate 92 is in this example attached by welding to the vertically positioned main body 94 of the assembly. 3Ody 94 is tubular and has an upper section 95 adapted to receive rotatable member 96, the upper portion 96Q of member 96 rests upon thrust bearings 97; the intermediate portion 96B of member 96 is retained between roller bearings 98; and the lower portion 96C extends into the lower section 95A of body 94. Potentio-meter or proportional feed back transducer 99 is attached to the lower section 95A and its shaft is coupled by sleeve 100 to lower portion 96C of member 96 to be operationally rotatable therewith.
Upper portion 96A of member 96 carries arm means 101 which extends outwardly of member 96 to contact roll 14. The free rotation of member 96 is constrained by spring 102 which extends between member 96 (pin 103) and pin 104 the latter being fixed to extend upwardly from mounting plate 92.
As can be seen, spring 102 maintains arm 101 in constant contact with the edge of roll 14. As the diameter of roll 14 decreases member 96 rotates transducer 99, which in turn sends an electrical signal representa-3~
tive of this decrease in roll diameter, to the isolation amplification module 88 (Figure 6), thus effecting a continuous and automatic adjustment of the speed of the appropriate motor M.
In the arrangement of Figures 9 and 10, mounting bracket 90 is provided with slots 105 which accept cap screws 93 and permit adjustment of mounting plate 92 and hence sensing means 89 towards or away from roll 14.
Referring back to the principal operation of the drive assembly, as the polyethylene strip 12 or the paper 16 passes over the rod 28 of dancer 22 it has a tendency to rotate the dancer rod 22. The amount by which the dancer rod 22 is rotated is a function of the speed, or more speciFically the tension of the material 12 or 16 at that point. The more the dancer rod 22 is rotated or out of alignment from its initially set position, the more the speed must be adjusted. Consequently, as the dancer rod 22 rotates the shaft 30 and the gear 70 rotates the gear 78 of potentio-meter 80 which sends a signal to isolation amplification module 88 which sends a signal to motor controller 86 which then Feeds a signal via the reversing logic module 84 for adjusting the speed of motor M.
Should the polyethylene strip 12 or paper 16 be exhausted on ` the rolls 10 or 14 respectively, then the spring 50 has a tendency to pull the dancer rod 22 upwards and to cause a rotation of shaft 30 to be applied to gear 70 and to gear 78 and to cause potentiometer 80 to send a signal to mo~or M to stop turning As has been previous1y described, if the motor ceases to turn or to input a torque to worm gear drive W, then the steep ratio of the worm gear drive causes the roll 10, 14 and 20 respectively to cease to turn.
Likewise, if for some reason the tension should be decreased, the dancer rod 22 will move upwardly and cause a signal to be transmitted to motor M and cause the variable speed motor M to slow down. The input speed to worm gear drive W will therefore be decreased and cause the roll 10, 14 or 20 to slow down.
In previous machines the maintenance of the proper tension had to be continuously monitored by a skilled operator during the complete un-winding of the material from the roll.
It should be appreciated that the present invention is a means for adjusting the speed of the rolls 10 and 14. The rolls 10 and 14 are driven through motors M and worm gear drive W as opposed to previous systems in which the material was pulled from the rolls 10 or 14.
An additional embodiment of the disclosed invention is best shown in Figure 8. A driven feed roll 90 containing a strip 92 is mounted to frame F. The strip 92 may be polyethylene, paper, the joined polyethy-lene paper strip above described, or any other suitable material or materials. The driven feed roll 90 feeds the strip 92 to a dancer rod 22 as above described~ and to table 94. The material 92 passes along table 94 to cutting means 96 for cutting, slicing, perForating, sealing, collating or any other operation that may be necessary.
Although only one driven feed roll 90 is disclosed in Figure 8, it should be obvious that any number of rolls may be mounted to frame F and it is not necessary that the strip 92 be joined prior to mounting roll 90 on frame F. Should multiple rolls be used, then the joining means 18 may be mounted on frame F prior to cutting or operating means 96.
~ 10 -~93~
By way of a more general description of operation, the first proceeding involving the roll drive apparatus according to the invention would naturally be the loading of a roll of material onto the roll drive shaft. As this is done, the roll diameter sensincJ arm 10 is automatically offset according to the diameter of the roll. As can be seen in Figure 10, as the arm is offset, the transducer 99 (potentiometer) is also rotated giving a voltage signal to the isolation amplification module 88.
After the roll is on the shaft it will be necessary to unwind some product in order, for example, to splice into an existing web. This can be accomplished by manually offsetting the dancer asse~bly which will automatically feed out material. However, it will be appreciated that pro-vision may be made -For manual or automatic selection of functions.
In the manual mode, the operator would simply set the roll drive control system (not shown) on manual (versus automatic) then actuate until ~5 enough product had been unwound. (Note: provision would be made to adjust the manual feed rate).
Once the splice is made, the slack in the unwound material will obviously have to be taken up~ The reversing logic module 84 is provided for that purpose~ By means o-F conventional external switching within the drive control system, the motor is run in reverse until the slack is taken up and then the control is put back into an automatic forward mode. (Here again, provision will be made for adjusting the reverse speed).
On the initial set up of the roll drive assembly, the dancer assembly should be balanced by adjustment o-F the counterweight ~6. This will allow direct sensing of tension against the spring 50. The spring rate 3~
can be either predetermined, or adjustable to give the desired tension on ~he unwinding material.
The controller 86 and isolation module 88 are also, as w-ill be appreciated, adjusted to predetermined values.
In operation, as heretofor described, the tension on the web will cause the dancer assembly 22 to "pull down", which will automatically cause the motor M to respond, upon receiving a voltage signal from the potentiometer 80. The dancer will then stabilize at the operating position, with any change in tension beins thereafter compensated by change in the motor speed. That is to say, if the dancer assembly rotates downwardly too far, the signal from poteniometer 80 will cause the motor to speed up; con-versely if the dancer rides too high, the signal will cause the motor to slow down.
As the roll diameter diminishes, the signal from the roll sensing apparatus also changes (Figures 9 and 10). This aids in maintaining a stable tension. As was mentioned previously, if the dancer arm moves from its desired position, the motor will strive to correct the situation. How-ever, without a diameter sensing means, the same amount of motor adjustment would be made for a large roll as for a small roll. It is readily apparent that to sllpply the same amount of material -from a small roll as from a large roll, it will be necessary to rotate the small roll faster. Therefore, to maintain a satis~actorily stable feed rate, the acceleration rate of the motor must also be adjusted as the roll diameter diminishes.
While this invention has been described as having a preferred design, it is understood that it is capable of further modification, uses 3~ii and/or adaptations of the invention following in general the principle of the invention and including such departures from the present disclosure as come within known and customary practice in the art to which the invention pertains, and as may be applied to the central Features hereinbefore set forth, and fall within the scope of the invention o-F the limits of the appended claims.
This invention is directed principally, but not exclusively, to collators for assembling a plurality of paper webs and carbon or transfer webs into continuous business forms.
As applied to collating machines, one of the disadvantages of present systems, where a continuous sheet or form is being transferred from a feed roll to another roll, is the necessity for constant adjustments to compensate for web tension or roll speed. Furthermore, in any system which can only feed stock by pulling, whether the stock be paper, polythene, or any other material, it is impossible to run at zero tension. As will be appreciated, the force required to pull stock from a large roll varies from that which is required with a small roll. This analogy also applies to braking and stopping large and small rolls.
Individual rolls may also vary from one another in size, density and strength, and again in prior systems it is generally left to the operator to make the various individual adjustments.
Consequently there is a need for a drive system which would en-able an operator to pre-set a tension for each roll of stock, and preferably not have to make any further adjustments, other than when the rolls require changing, for tension, braking or speed, unless different tensions are required to compensate for problems such as short or long sheet length, or different types of stock e.g. polythene. With such a system, even if ad-justment of tension was required, it would be preferable if no additional adjustments were required for brak;ng or speed.
As indicated above, prior systems which can only feed stock by pulling, render it impossible to run at zero tension, however, with the 3~3 ~ S
present invention to be described, rolls are driven through the core, thus making it possible to adjust toward zero tension.
The primary object of the disclosed invention is to provide a means for driving a roll of stock which will supply upon demand a continu-ous sheet, at an automatic~ constantly adjusted speed, and at a pre-set tension.
An additional object of the disclosed invention is to provide a means for sensing speed changess or tension changes, of the materials and to adjust the s~eed of the drive roll.
Yet a further object of the disclosed invention is to provide a spring loaded counterweighted displaceable dancer rod for sensing the speed changes of the materials.
Still another object of the disclosed invention is to provide a large diameter gear mounted to the dancer rod and in contact with a small diameter gear connected to a potentiometer for adjusting the speed of the motor.
Yet another object of the disclosed invention is to provide a dancer rod which has a displaceable counte~eight so that the dancer as-sembly may be balanced. This aids sensing of only the web and spring tension (and excludes the weight of the dancer assembly).
Yet another object of the disclosed invention is to provide a compact displacement sensing means mounted some distance from the frame for sensing the displacement of the dancer rod and adjusting the motor speed thereby.
Yet another object of the disclosed invention is to provide a ~ 2 --~ ~3 ~3`;~3~i sensing means for sensing the changes in diameter of a roll of stock and adjusting the speed of the roll drive motor accordingly.
These and other objects and advantages of the invention will be readily apparent in view of the following description and drawings of the above described invention.
The above and other objects and advantages and novel features of the present invention will become apparent From the following detailed description of the preferred embodiment of the invention illustrated in the accompanying drawings, wherein:
Figure 1 is a front elevational view of a converter showing a feed roll of, for example polyethylene, a feed roll of, for example paper, and a take-up roll for the joined materials;
Figure 2 is a rear elevational view of the mechanism of Figure 1 showing the motor drive means driving the rolls and the tension sensing means;
Figure 3 is a fragmentary perspective view of the dancer rod shwoing its spring loading and counterweighting;
Figure 4 is an expanded view of the tension sensing and adjust-ing mechanism of Figure 2;
Figure 5 i5 a fragmentary perspective view of the motor and worm gear reducer for driving the rolls, Figure 6 is an elementary block diagram of the control circuit;
Figure 7 is a fragmentary cross-sectional view of the dancer rod and sensing mechanism mounted on the frame, Figure 8 is a different embodiment of Figure 1;
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Figure 9 is a plan view of a roll d-iameter sensing device Form-ing part of the invention;
Figure 10 is a sectional elevation of the device according to Figure 9.
Referring now to Figure 1, a frame F for mounting the necessary rolls and mechanisms is shown. The frame F has a -front side and a rear side the front side being shown in Figure 1.
A polyethylene feed roll 10 having a continuous strip of poly-ethylene 12 is shown mounted on the front side of frame F. A paper feed roll 14 for holding a continuous strip of paper 16 is shown opposite poly-ethylene feed roll 10. Operating means for joining, or otherwise performing work on the polyethylene strip 12 and the paper strip 16 are shown at 18. A
take-up roll 20 for winding the joined polyethylene 10 and paper 16 is shown, however, the subject invention is not limited to such a specific take-up system.
Although for the purpose of this description a polyethylene feed roll 10 and a paper feed roll 14 are disclosed, it should be evident that in practice a collator can utilize many rolls and a variety of materials.
A dancer rod 22, as best shown in Figure 3, is provided For each of the rolls 10 and 14 of Figure 1.
A d~ncer rod 22 is comprised generally of a pair of arms 24 and 26 connected by rod 28 and shaft 30. Rod 28 rotates on pins 32 which are positioned and fastened at 34 through arms 24 and 26.
A collar 38, having bearings 39 and races 39A, is bolted to Frame F by bolts 40. Shaft 30 extends through frame F and aperture H
located in collar 38 and frame F. Shaft 30 connects arms 24 and 26 and is maintained in position by key 42 mounted in key slot 44 of arm 26. Races 39A are maintained in position by retaining rings ~1 and 41A. Spacer ring 43 is concentrically mounted adjacent retaining ring 41A.
A counterweight 46 is displaceably mounted on shaft 48 mounted in arm 24. The counterweight is displaceable over the length of shaft 48 for balancing the dancer assembly.
Spring 50 is connected to arm 24 and frame F for maintaining positive tension on dancer rod 22. While a tension spring 50 is shown the arrangement could satisfactorily utilize a torsion spring.
Referring again to Figure 1 it can be seen that polyethylene strip 12 proceeds from polyethylene feed roll 10 to roller 52, around roller 52 to dancer rod 22 and to additional rollers 54 and 56. Paper strip 16 of paper feed roll 14 advances from roller 58 to a second dancer rod 22 and then to rollers 60 and 62.
Polyethylene strip 12 and paper strip 16 are joined by joining means 18 and then advanced via roller 64, to be wound around driven take-up roll 20.
Referring now to Figure 2, the rear side o-f frame F is shown.
The drive means D for driving the rolls 10 20 and 14 are best shown in Figure 5.
A motor M is connected to worm gear drive W which is connected to a bearing housing S which passes through frame F and is drivingly connec-ted to the rolls 109 14 and 20. A direct current motor is disclosed9 although any other suitable adjustable speed motor is possible. The worm , ~
~3~35 gear drive W may have a sufficiently steep gear ration to make it self locking. Without input torque from the motor M the worm gear drive W
requires such high torque to turn that it is almost impossible for the rolls lO, 14 and 20 to turn if the motors M are not providing input torque to worm gear drive W. Worm gear drive W also aids in maintaining a stable tension in the material feed and as indicated above, may be provided with a self~locking feature whereby any time the motor power is cut-off~ the roll drive has to stop. This can also be accomplished by the use of dynamic braking on the motor itself.
The dancer rod displacement sensing means is best shown in Figure 4.
Collar 68 having bearings 69 and races 69A is mounted concentric with shaft 30 and held in place by bolts 40 used for mounting collar 38 to frame F. Races 69A are held in position by retaining rings 71 and 71A.
Shaft 30 passes through frame F and aperture H and sleeve C and connected with toothed gear 70 mounted on collar 68. Gear 70 is connected to shaft 30 by cap screw 72 so that any displacement of dancer rod 22 will cause shaft 30 to turn and thereby cause gear 70 to turn. Gear 70 has a number of teeth 74 located about its circumference for meshing with teeth 76 of gear 78. Gear 78 is connected to gear-adjustable potentiometer 80 for adjusting the output signal to motor M by means of wires 32 connecting potentiometer 80 to isolation amplification module 88. Potentiometer 80 is mounted on bracket B affixed to frame F so that gear 78 will be capable of meshing with the teeth of gear 70. As best seen in Figure 2? it can be seen that each ~$~3~
roll 10, 14 and 20 has its own motor M and worm gear drive W or drive means D. Likewise, each roll 10 and 14 has its own dancer rod 22 as well as dis-placement sensing means A for continuously adjusting the speed of the appropriate motor M.
The motor M may be connected to a reversing and logic module 84, as best shown in Figure 6, which is connected to the output side of motor controller 86. Motor controller 86 may be connected to isolation amplifica-tion module 88 and proportioning feed back transducer or potentiometer 80.
In this way, the speed of motor M may be controlled by the potentiometer 80 of displacement sensing means A.
A roll 10 of polyethylene strip 12 and a roll 14 of paper 16 are mounted in frame F. The polyethylene strip 12 and the paper strip 16 are wound through the appropriate rollers and dancer rods until coming together at operating or joining means 18. The ioined strip then exists from joining means 18 and passes by the appropriate rollers and dancer rods to be wound about take-up roll 20.
Due to the relative thickness differences of the polyethylene strip 12 and the paper backing 16, the angular speed of rotation o-f rolls 10 and 14 changes as the diameter of the material 12 and 16 on the rolls 10 and 14 respectively, changes due to the polyethylene 10 and paper 16 being driven from their respective rolls. Because the polyethylene 10 and the paper 16 have different thichnesses their wound diameters diminish at dif-ferent rates. Consequently, i-f their speeds of removal from the rolls are to be as initially set, then the motors M driving the respective rolls 10 and 14 must be adjusted independently of each other. To facilitate this 3~
adjustment, reference is made to Figures 9 and 10 which show separate sensing means 89 operable to sense the decreasing dimensions of the rolls of material.
Figure 9 shows the sensing means 89 mounted in close proximity to, For example, roll 14. Sensing means 89 comprises in this particular embodiment, in an assembly shown in part section in Figure 10, which includes:- a right angle mounting bracket 90 attached by cap screws 91 to frame F; a mounting plate 92 is adjustably mounted to bracket 90 by cap screws 93. Mounting plate 92 is in this example attached by welding to the vertically positioned main body 94 of the assembly. 3Ody 94 is tubular and has an upper section 95 adapted to receive rotatable member 96, the upper portion 96Q of member 96 rests upon thrust bearings 97; the intermediate portion 96B of member 96 is retained between roller bearings 98; and the lower portion 96C extends into the lower section 95A of body 94. Potentio-meter or proportional feed back transducer 99 is attached to the lower section 95A and its shaft is coupled by sleeve 100 to lower portion 96C of member 96 to be operationally rotatable therewith.
Upper portion 96A of member 96 carries arm means 101 which extends outwardly of member 96 to contact roll 14. The free rotation of member 96 is constrained by spring 102 which extends between member 96 (pin 103) and pin 104 the latter being fixed to extend upwardly from mounting plate 92.
As can be seen, spring 102 maintains arm 101 in constant contact with the edge of roll 14. As the diameter of roll 14 decreases member 96 rotates transducer 99, which in turn sends an electrical signal representa-3~
tive of this decrease in roll diameter, to the isolation amplification module 88 (Figure 6), thus effecting a continuous and automatic adjustment of the speed of the appropriate motor M.
In the arrangement of Figures 9 and 10, mounting bracket 90 is provided with slots 105 which accept cap screws 93 and permit adjustment of mounting plate 92 and hence sensing means 89 towards or away from roll 14.
Referring back to the principal operation of the drive assembly, as the polyethylene strip 12 or the paper 16 passes over the rod 28 of dancer 22 it has a tendency to rotate the dancer rod 22. The amount by which the dancer rod 22 is rotated is a function of the speed, or more speciFically the tension of the material 12 or 16 at that point. The more the dancer rod 22 is rotated or out of alignment from its initially set position, the more the speed must be adjusted. Consequently, as the dancer rod 22 rotates the shaft 30 and the gear 70 rotates the gear 78 of potentio-meter 80 which sends a signal to isolation amplification module 88 which sends a signal to motor controller 86 which then Feeds a signal via the reversing logic module 84 for adjusting the speed of motor M.
Should the polyethylene strip 12 or paper 16 be exhausted on ` the rolls 10 or 14 respectively, then the spring 50 has a tendency to pull the dancer rod 22 upwards and to cause a rotation of shaft 30 to be applied to gear 70 and to gear 78 and to cause potentiometer 80 to send a signal to mo~or M to stop turning As has been previous1y described, if the motor ceases to turn or to input a torque to worm gear drive W, then the steep ratio of the worm gear drive causes the roll 10, 14 and 20 respectively to cease to turn.
Likewise, if for some reason the tension should be decreased, the dancer rod 22 will move upwardly and cause a signal to be transmitted to motor M and cause the variable speed motor M to slow down. The input speed to worm gear drive W will therefore be decreased and cause the roll 10, 14 or 20 to slow down.
In previous machines the maintenance of the proper tension had to be continuously monitored by a skilled operator during the complete un-winding of the material from the roll.
It should be appreciated that the present invention is a means for adjusting the speed of the rolls 10 and 14. The rolls 10 and 14 are driven through motors M and worm gear drive W as opposed to previous systems in which the material was pulled from the rolls 10 or 14.
An additional embodiment of the disclosed invention is best shown in Figure 8. A driven feed roll 90 containing a strip 92 is mounted to frame F. The strip 92 may be polyethylene, paper, the joined polyethy-lene paper strip above described, or any other suitable material or materials. The driven feed roll 90 feeds the strip 92 to a dancer rod 22 as above described~ and to table 94. The material 92 passes along table 94 to cutting means 96 for cutting, slicing, perForating, sealing, collating or any other operation that may be necessary.
Although only one driven feed roll 90 is disclosed in Figure 8, it should be obvious that any number of rolls may be mounted to frame F and it is not necessary that the strip 92 be joined prior to mounting roll 90 on frame F. Should multiple rolls be used, then the joining means 18 may be mounted on frame F prior to cutting or operating means 96.
~ 10 -~93~
By way of a more general description of operation, the first proceeding involving the roll drive apparatus according to the invention would naturally be the loading of a roll of material onto the roll drive shaft. As this is done, the roll diameter sensincJ arm 10 is automatically offset according to the diameter of the roll. As can be seen in Figure 10, as the arm is offset, the transducer 99 (potentiometer) is also rotated giving a voltage signal to the isolation amplification module 88.
After the roll is on the shaft it will be necessary to unwind some product in order, for example, to splice into an existing web. This can be accomplished by manually offsetting the dancer asse~bly which will automatically feed out material. However, it will be appreciated that pro-vision may be made -For manual or automatic selection of functions.
In the manual mode, the operator would simply set the roll drive control system (not shown) on manual (versus automatic) then actuate until ~5 enough product had been unwound. (Note: provision would be made to adjust the manual feed rate).
Once the splice is made, the slack in the unwound material will obviously have to be taken up~ The reversing logic module 84 is provided for that purpose~ By means o-F conventional external switching within the drive control system, the motor is run in reverse until the slack is taken up and then the control is put back into an automatic forward mode. (Here again, provision will be made for adjusting the reverse speed).
On the initial set up of the roll drive assembly, the dancer assembly should be balanced by adjustment o-F the counterweight ~6. This will allow direct sensing of tension against the spring 50. The spring rate 3~
can be either predetermined, or adjustable to give the desired tension on ~he unwinding material.
The controller 86 and isolation module 88 are also, as w-ill be appreciated, adjusted to predetermined values.
In operation, as heretofor described, the tension on the web will cause the dancer assembly 22 to "pull down", which will automatically cause the motor M to respond, upon receiving a voltage signal from the potentiometer 80. The dancer will then stabilize at the operating position, with any change in tension beins thereafter compensated by change in the motor speed. That is to say, if the dancer assembly rotates downwardly too far, the signal from poteniometer 80 will cause the motor to speed up; con-versely if the dancer rides too high, the signal will cause the motor to slow down.
As the roll diameter diminishes, the signal from the roll sensing apparatus also changes (Figures 9 and 10). This aids in maintaining a stable tension. As was mentioned previously, if the dancer arm moves from its desired position, the motor will strive to correct the situation. How-ever, without a diameter sensing means, the same amount of motor adjustment would be made for a large roll as for a small roll. It is readily apparent that to sllpply the same amount of material -from a small roll as from a large roll, it will be necessary to rotate the small roll faster. Therefore, to maintain a satis~actorily stable feed rate, the acceleration rate of the motor must also be adjusted as the roll diameter diminishes.
While this invention has been described as having a preferred design, it is understood that it is capable of further modification, uses 3~ii and/or adaptations of the invention following in general the principle of the invention and including such departures from the present disclosure as come within known and customary practice in the art to which the invention pertains, and as may be applied to the central Features hereinbefore set forth, and fall within the scope of the invention o-F the limits of the appended claims.
Claims (20)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A roll drive control apparatus for unwinding a continuous length of material from a feed roll comprising:
a. a frame b. a driven rotating feed roll mounted in said frame for unwinding said material from said feed roll;
c. operating means for performing work in said material;
d. a spring loaded counterweighted displaceable dancer rod having a zero position and a maximum position contacting said material at a point between said feed roll and said operating means and adapted for being displaced between said zero position and said maximum position by tension changes of said material;
e. an adjustable speed motor means mounted on said frame connected to said feed roll for rotating said feed roll; and f. dancer rod displacement sensing means connected to said dancer rod and said motor means and mounted on said frame and adapted for continuously adjusting the speed of said motor means.
a. a frame b. a driven rotating feed roll mounted in said frame for unwinding said material from said feed roll;
c. operating means for performing work in said material;
d. a spring loaded counterweighted displaceable dancer rod having a zero position and a maximum position contacting said material at a point between said feed roll and said operating means and adapted for being displaced between said zero position and said maximum position by tension changes of said material;
e. an adjustable speed motor means mounted on said frame connected to said feed roll for rotating said feed roll; and f. dancer rod displacement sensing means connected to said dancer rod and said motor means and mounted on said frame and adapted for continuously adjusting the speed of said motor means.
2. A roll drive control apparatus as defined in claim 1 further comprising:
a. a second driven rotating feed roll for unwinding a continuous strip of a second material from said second feed roll, said second feed roll being mounted on said frame at a distance from said first feed roll;
b. material joining means surrounding said first material and said second material for fastening said first material to said second material;
c. a second spring-loaded counterweighted displaceable dancer rod having a zero position and a maximum position and contacting said second material at a point between said second feed roll and said operating means and adapted for being displaced between said zero position and said maximum position by tension changes of said second material as said second material is being unwound from said second feed roll;
d. a second adjustable speed motor means mounted on said frame and connected to said second feed roll for rotating said second feed roll;
and e. dancer rod displacement sensing means connected to said second dancer rod and said second adjustable speed motor means and mounted on said frame and adapted for continuously adjusting the speed of said motor means.
a. a second driven rotating feed roll for unwinding a continuous strip of a second material from said second feed roll, said second feed roll being mounted on said frame at a distance from said first feed roll;
b. material joining means surrounding said first material and said second material for fastening said first material to said second material;
c. a second spring-loaded counterweighted displaceable dancer rod having a zero position and a maximum position and contacting said second material at a point between said second feed roll and said operating means and adapted for being displaced between said zero position and said maximum position by tension changes of said second material as said second material is being unwound from said second feed roll;
d. a second adjustable speed motor means mounted on said frame and connected to said second feed roll for rotating said second feed roll;
and e. dancer rod displacement sensing means connected to said second dancer rod and said second adjustable speed motor means and mounted on said frame and adapted for continuously adjusting the speed of said motor means.
3. A roll drive control apparatus as defined in claim 1 wherein:
a. said dancer rod displacement sensing means includes:
i. a potentiometer connected to said first motor means;
having a member rotatable in response to displacement of said dancer rod to adjust said potentiometer and therefore adjust said motor speed.
a. said dancer rod displacement sensing means includes:
i. a potentiometer connected to said first motor means;
having a member rotatable in response to displacement of said dancer rod to adjust said potentiometer and therefore adjust said motor speed.
4. A roll drive control apparatus as defined in claim 1 wherein:
a. said dancer rod displacement sensing means includes:
1. a first substantially large circular-shaped toothed rotatable gear mounted to said dancer rod frame end;
ii. a gear adjustable potentiometer having a second circular-shaped toothed rotatable gear extending therefrom and meshed with said first gear;
iii. said potentiometer being connected to said first motor means; and iv. displacement of said dancer rod between said zero position and said maximum position causing said first gear to rotate and thereby rotating said second gear for adjusting said potentiometer and thereby adjusting said motor speed.
a. said dancer rod displacement sensing means includes:
1. a first substantially large circular-shaped toothed rotatable gear mounted to said dancer rod frame end;
ii. a gear adjustable potentiometer having a second circular-shaped toothed rotatable gear extending therefrom and meshed with said first gear;
iii. said potentiometer being connected to said first motor means; and iv. displacement of said dancer rod between said zero position and said maximum position causing said first gear to rotate and thereby rotating said second gear for adjusting said potentiometer and thereby adjusting said motor speed.
5. A roll drive control apparatus as defined in claim 1 wherein:
a. said first adjustable speed motor means includes:
i. a direct current adjustable speed motor; and ii. a worm reducer with a substantially steep gear ratio adjustably connected to said motor and to said roll as a means for adjust-ing said roll rotational speed.
a. said first adjustable speed motor means includes:
i. a direct current adjustable speed motor; and ii. a worm reducer with a substantially steep gear ratio adjustably connected to said motor and to said roll as a means for adjust-ing said roll rotational speed.
6. A roll drive control apparatus as defined in claim 1, wherein:
a. first adjustable speed motor means includes a dynamic braking motor connected to said roll for adjusting said roll rotational speed.
a. first adjustable speed motor means includes a dynamic braking motor connected to said roll for adjusting said roll rotational speed.
7. A roll drive control apparatus as defined in claim l wherein:
a. said dancer rod may be balanced by adjusting the position-ing of a counterweight on a shaft connected to said dancer rod.
a. said dancer rod may be balanced by adjusting the position-ing of a counterweight on a shaft connected to said dancer rod.
8. A roll drive control apparatus as defined in claim 1, wherein:
a. said potentiometer is connected to an isolation amplifica-tion module;
b. said module is connected to a motor controller;
c. said motor controller is connected to a reversing and logic module; and d. said reversing and logic module is connected to said motor means for adjusting said motor speed.
a. said potentiometer is connected to an isolation amplifica-tion module;
b. said module is connected to a motor controller;
c. said motor controller is connected to a reversing and logic module; and d. said reversing and logic module is connected to said motor means for adjusting said motor speed.
9. A roll drive control apparatus as defined in claim 1, wherein:
a. said displacement sensing means comprises:
i. a rotatable shaft connected to said dancer rod and ex-tending through said frame;
ii. a toothed rotatable gear mounted on said shaft and at a distance from said frame;
iii. a gear adjustable potentiometer having a gear mounted on a shaft extending therefrom;
iv. a bracket mounted on said frame for holding said poten-tiometer whereby said potentiometer gear is planarly meshed with said gear for adjusting said potentiometer; and v. said potentiometer is connected to said motor means for adjusting said motor means speed.
a. said displacement sensing means comprises:
i. a rotatable shaft connected to said dancer rod and ex-tending through said frame;
ii. a toothed rotatable gear mounted on said shaft and at a distance from said frame;
iii. a gear adjustable potentiometer having a gear mounted on a shaft extending therefrom;
iv. a bracket mounted on said frame for holding said poten-tiometer whereby said potentiometer gear is planarly meshed with said gear for adjusting said potentiometer; and v. said potentiometer is connected to said motor means for adjusting said motor means speed.
10. A roll drive control apparatus as defined in claim 1 further including:
a. feed roll diameter sensing means mounted on said frame and adapted for continuously adjusting the speed of said motor means as a direct function of decreasing roll diameter.
a. feed roll diameter sensing means mounted on said frame and adapted for continuously adjusting the speed of said motor means as a direct function of decreasing roll diameter.
11. A roll drive control apparatus for unwinding a continuous length of material from a feed roll and winding that material onto a take-up roll, comprising:
a. a frame b. a driven rotating feed roll mounted on said frame;
c. a driven rotating take-up roll mounted on said frame at a distance from said feed roll, d. a spring-loaded counterweighted displaceable dancer rod having a zero position and a maximum position and contacting said material at a point between said feed roll and said take-up roll and adapted for being displaced between said zero position and said maximum position by tension changes of said material;
e. a first adjustable speed motor means mounted on said frame and connected to said feed roll for rotating said feed roll; and f. dancer rod displacement sensing means connected to said dancer rod and said first motor means and mounted on said frame and adapted for continuously adjusting the speed of said first motor means.
a. a frame b. a driven rotating feed roll mounted on said frame;
c. a driven rotating take-up roll mounted on said frame at a distance from said feed roll, d. a spring-loaded counterweighted displaceable dancer rod having a zero position and a maximum position and contacting said material at a point between said feed roll and said take-up roll and adapted for being displaced between said zero position and said maximum position by tension changes of said material;
e. a first adjustable speed motor means mounted on said frame and connected to said feed roll for rotating said feed roll; and f. dancer rod displacement sensing means connected to said dancer rod and said first motor means and mounted on said frame and adapted for continuously adjusting the speed of said first motor means.
12. A roll drive control apparatus as defined in claim 11 further comprising:
a. a second driven rotating feed roll for unwinding a contin-uous strip of a second material from said second feed roll, said second feed roll being mounted on said frame at a distance from said first feed roll;
b. a material operating means surrounding said first material and said second material for fastening said first material to said second material;
c. second spring-loaded counterweighted displaceable dancer rod having a zero position and a maximum position and contacting said second material at a point between said second feed roll and said take-up roll and adapted for being displaced between said zero position and said maximum position by tension changes of said second material as said second material is being unwound from said second feed roll and wound onto said take-up roll;
d. a second adjustable speed motor means mounted on said frame and connected to said second feed roll for rotating said second feed roll;
and e. dancer rod displacement sensing means connected to said second dancer rod and said second adjustable speed motor means and mounted on said frame and adapted for continuously adjusting the speed of said second motor means.
a. a second driven rotating feed roll for unwinding a contin-uous strip of a second material from said second feed roll, said second feed roll being mounted on said frame at a distance from said first feed roll;
b. a material operating means surrounding said first material and said second material for fastening said first material to said second material;
c. second spring-loaded counterweighted displaceable dancer rod having a zero position and a maximum position and contacting said second material at a point between said second feed roll and said take-up roll and adapted for being displaced between said zero position and said maximum position by tension changes of said second material as said second material is being unwound from said second feed roll and wound onto said take-up roll;
d. a second adjustable speed motor means mounted on said frame and connected to said second feed roll for rotating said second feed roll;
and e. dancer rod displacement sensing means connected to said second dancer rod and said second adjustable speed motor means and mounted on said frame and adapted for continuously adjusting the speed of said second motor means.
13. A roll drive control apparatus as defined in claim 10 wherein:
a. said dancer rod displacement sensing means includes:
i. a potentiometer connected to said first motor means having a member rotatable in response to displacement of said dancer rod to adjust said potentiometer and thereby adjust said motor speed.
a. said dancer rod displacement sensing means includes:
i. a potentiometer connected to said first motor means having a member rotatable in response to displacement of said dancer rod to adjust said potentiometer and thereby adjust said motor speed.
14. A roll drive control apparatus as defined in claim 11 wherein:
a. said dancer rod displacement sensing means includes:
i. a first substantially large circular-shaped toothed rotatable gear mounted to said dancer rod frame end;
ii. a gear adjustable potentiometer having a second circular-shaped toothed rotatable gear extending therefrom and meshed with said first gear;
iii. said potentiometer connected to said first motor means 3 and iv. displacement of said dancer rod between said zero position and said maximum position causing said first gear to rotate and thereby rotating said second gear for adjusting said potentiometer and thereby adjusting said motor speed.
a. said dancer rod displacement sensing means includes:
i. a first substantially large circular-shaped toothed rotatable gear mounted to said dancer rod frame end;
ii. a gear adjustable potentiometer having a second circular-shaped toothed rotatable gear extending therefrom and meshed with said first gear;
iii. said potentiometer connected to said first motor means 3 and iv. displacement of said dancer rod between said zero position and said maximum position causing said first gear to rotate and thereby rotating said second gear for adjusting said potentiometer and thereby adjusting said motor speed.
15. A roll drive control apparatus as defined in claim 11 wherein:
a. said first adjustable speed motor means includes, i. a direct current adjustable speed motor; and ii. a worm reducer with a substantially steep gear ratio adjustably connected to said motor and to said roll as a means for adjust-ing said roll rotational speed.
a. said first adjustable speed motor means includes, i. a direct current adjustable speed motor; and ii. a worm reducer with a substantially steep gear ratio adjustably connected to said motor and to said roll as a means for adjust-ing said roll rotational speed.
16. A roll drive control apparatus as defined in claim 11 wherein:
a. said first adjustable speed motor means includes a dynamic braking motor connected to said roll for adjusting said roll rotational speed.
a. said first adjustable speed motor means includes a dynamic braking motor connected to said roll for adjusting said roll rotational speed.
17. A roll drive control apparatus as defined in claim 11, wherein:
a. said dancer rod may be balanced by selectably adjusting the position of a counterweight on a shaft connected to said dancer rod.
a. said dancer rod may be balanced by selectably adjusting the position of a counterweight on a shaft connected to said dancer rod.
18. A roll drive control apparatus as defined in claim 11, wherein:
a. said potentiometer is connected to an isolation amplifica-tion module;
b. said module is connected to a motor controller;
c. said motor controller is connected to a reversing and logic module; and d. said reversing and logic module is connected to said motor means for adjusting said motor speed.
a. said potentiometer is connected to an isolation amplifica-tion module;
b. said module is connected to a motor controller;
c. said motor controller is connected to a reversing and logic module; and d. said reversing and logic module is connected to said motor means for adjusting said motor speed.
19. A roll drive control apparatus as defined in claim 11, wherein:
a. said displacement sensing means comprises:
i. a rotatable shaft connected to said dancer rod and ex-tending through said frame;
ii. a toothed rotatable gear mounted on said shaft and at a distance from said frame;
iii. a gear adjustable potentiometer having a gear mounted on a shaft extending therefrom;
iv. a bracket mounted on said frame for holding said poten-tiometer whereby said potentiometer gear is planarly meshed with said rod gear for adjusting said potentiometer; and v. said potentiometer is connected to said motor means for adjusting said motor means speed.
a. said displacement sensing means comprises:
i. a rotatable shaft connected to said dancer rod and ex-tending through said frame;
ii. a toothed rotatable gear mounted on said shaft and at a distance from said frame;
iii. a gear adjustable potentiometer having a gear mounted on a shaft extending therefrom;
iv. a bracket mounted on said frame for holding said poten-tiometer whereby said potentiometer gear is planarly meshed with said rod gear for adjusting said potentiometer; and v. said potentiometer is connected to said motor means for adjusting said motor means speed.
20. A roll drive control apparatus as defined in claim 11 further including:
a. feed roll diameter sensing means mounted on said frame and adapted for continuously adjusting the speed of said motor means as a direct function of decreasing roll diameter.
a. feed roll diameter sensing means mounted on said frame and adapted for continuously adjusting the speed of said motor means as a direct function of decreasing roll diameter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US43451782A | 1982-10-15 | 1982-10-15 | |
| US434,517 | 1982-10-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1193235A true CA1193235A (en) | 1985-09-10 |
Family
ID=23724547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000418146A Expired CA1193235A (en) | 1982-10-15 | 1982-12-20 | Roll drive control apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1193235A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110205793A (en) * | 2019-04-30 | 2019-09-06 | 岭南师范学院 | A kind of Clothing Specialty student cloth fixed-length cutting device |
-
1982
- 1982-12-20 CA CA000418146A patent/CA1193235A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110205793A (en) * | 2019-04-30 | 2019-09-06 | 岭南师范学院 | A kind of Clothing Specialty student cloth fixed-length cutting device |
| CN110205793B (en) * | 2019-04-30 | 2024-01-05 | 岭南师范学院 | Cloth fixed-length cutting device for clothing specialty students |
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