US1265328A - Device for taking up and paying out slack. - Google Patents
Device for taking up and paying out slack. Download PDFInfo
- Publication number
- US1265328A US1265328A US83397014A US1914833970A US1265328A US 1265328 A US1265328 A US 1265328A US 83397014 A US83397014 A US 83397014A US 1914833970 A US1914833970 A US 1914833970A US 1265328 A US1265328 A US 1265328A
- Authority
- US
- United States
- Prior art keywords
- slack
- rolls
- motor
- roller
- fabric
- 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 - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
- B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
- B65H23/1888—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling web tension
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19219—Interchangeably locked
- Y10T74/19251—Control mechanism
- Y10T74/19256—Automatic
- Y10T74/19274—Automatic torque responsive
Definitions
- This invention relates to improvements in devices for taking up and paying out slack and is particularly applicable to machines having a plurality of sets of rolls through which a strip of fabric or other material is passed progressively and wherein a slack in the material is produced between ad acent sets of rolls either through non-uniformity of the-peripheral s eeds of the rolls or,
- Figure 1 schmatically illustrates one form of the invention used in connection with a mechanism of the aforesaid character
- Fig. 2 illustrates schematically a modification of the slaok-mechanismshown in Fi 1.
- Fig. 1 the "same schematically illustrates three sets of rolls 1, 2 and 3, acting progressivelyup'on a strip 4 of fabric or the like passing thereof rolls.
- the drawing schematically illustrates two sets of rollers 8, 9 and 10 arranged in a triangular relation, one set being located between the gripping rolls 1 and 2 and the other between the grippingrolls 2and 3.
- the fabric upon leaving the rolls 1 passes beneath the roller 8 over the Specification of Letters Patent.
- roller 9 and thence beneath the roller 10 to the gripping rolls 2. Thereafter the fabric passes in a similar manner around the other i set of rollers 8, 9 and 10 to the gripping rolls 3.
- the rollers 9 are vertically adjustable in suitable guides 11 and by their vertical adjustment compensate for variations in slack, or in other words, upon being raised take in slack and upon being lowered pay out slack.
- Each of the rollers 9 is supported by one or more cables 12 connected to a drum 13 o eratively connected to the armature of an e ectric motor 14.
- the motors 14 are shown as of the series type, each being provided Withan armature A. and a field winding F. Each is connected across a supply circuit 15-16 through a regulating resistance R and thus exerts a constant torque tending to wind up its cable 12 and thereby raise its roller 9.
- the resistances R are variable and are so adjusted as to avoid an undue strain on the fabric and to permit the drums to pay out cable as'the slack in the fabric decreases I It will thus be observed that the slack mechanisms are self-adjusting to increases in slack and are automatically adjusted by the tension of the fabric itself to decreases in slack, whereby their action is entirely automatic Also it will be observed that the slack is alwaysmaintained under a uni-.
- rollers 9 may in practice have only a limited range of adjustment, and under such conditions,
- means are provided to insure against such conditions.
- means are provided to automatically decrease the speed of the rolls 1, should the slack in the fabric between the rolls 1 and 2 tend to exceed a predetermined amount and to automatically increase the speed of the rolls 3 should the slack in the fabric between the rolls 2 and 3 tend to' exceed a predetermined amount.
- the decrease in speed of the rolls'l obviously slackens the feed of the fabric to the rolls 2 and in consequence decreases the slack produced between said sets of rolls.
- the increase in speed of the rolls 3 accelerates On the other hand.
- the motors 5 and 7 are shown as of the shunt type and are each provided with a resistance R to be included incircuit with shunt field winding F thereof. At normal running speed of the motor 5 its resistance R is included in circuit while at normal running speed of the motor 7 its resistance R is excluded from circuit by a switch 18.
- the resistance R of the motor 5 is also provided with a shortcircuiting switch 19 and said switches 18 and 19 are operable by spaced collars 20 and 21 provided on the cables 12 of the two slack mechanisms.
- the arrangement is such that when the left hand roller 9 rises to a predetermined position the collar 20 on its cablev strikes the switch 19 to close the same, whereas upon descent of said roller to a predetermined position the collar 21 strikes the switch 19 to restore the same to open position.
- This cycle of operation efiects slow-down and reacceleration of the motor 5.
- the cycle of operation of the switch 18 is just the reverse of that of switch 19.
- the two motors 5 and 7 are controlled entirely automatically and in such a manner that the speed of either may be varied entirely inde: pendently of the other, or both may be regulated simultaneously, in accordance with the slack conditions to be rectified.
- the slack mechanism illustrated in Fig. 2 has a similar adjustable roller 9 and supporting cable 12, but in this instance said cable is looped over a drum 22 and has connected to its free end, a weight 23.
- the weight 23 tends to lift the roller 9 but permits said roller to yield under the tension of the fabric as the slack in the latter falls off.
- the weight thus acts similarly to the motor 1 of Fig. 1.
- This arrangement is supplemented by a shunt motor 24 having its armature A operatively connected to the drum 22 and actin under certain conditions to electrically bra e said drum and under With this arrangeother conditions, to operate said drum.
- the motor 24 has its field winding F connected across a supply circuit 2526 and has its armature connected in a closed loop, including a resistance R with a line connection for said loop controlled by a switch 27 and including a. regulating resistance R
- the motor 24 will act as 'a dynamic brake when its armature is driven by the drum 22.
- the resistance R however, is so proportioned as to practically nullify the braking effect of the motor when its armature is rotated at a relatively slow speed.
- the drum 22 may be rotated under the action of the weight 23 to raise the roller 9 gradually without retardation by the motor, but should the weight 23 tend to raise the roller 9 rapidly, as in the case of a sudden increase in slack, then the motor would become effective as an electric brake thus braking the movement of the weight 23 and roller 9.
- the weight raises the roller 9 to its upper limit so that it is desirable to lower the roller for threading the fabric through the mechanism. As shown, this may be readily accomplished by closing the switch 27. I This starts the motor 2 1 in a direction to turn the drum 22 in a counterclockwise direction, thereby lifting the weight '23 and allowing the roller 9 to descend. Then when the fabric is threaded through the mechanism the switch 27 is opened, leaving the motor free to act as a dynamic brake, as aforesaid.
- a device for taking up and paying out slack in combination, a plurality of rollers, one being adjustable relative to another and automatic adjusting means for said adjustable roller including an electric motor,
- said motor under certain conditions acting as a dynamic brake.
- an adjustable member means associated therewith to exert a constant pull thereon in one direction and an electric motor for operating the same in an opposite direction, said motor also acting responsive to variations in slack to vary the speed of the end Sets of rolls in inverse relation upon corresponding variations in slack between the same and the intermediate set of rolls.
- a mechanism including 1 three sets of power-operated rolls feeding material from one to another in progression and at relatively different speeds and means responsive to variations in slack to vary the speed of the end set of rolls in inverse relation upon corresponding variations in slack between the same and the intermediate setz of rolls, said means controlling said end sets of rolls independently of one another.
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- Treatment Of Fiber Materials (AREA)
Description
C. T. HENDERSON. DEVICE FORTAKING UP AND PAYlNG OUT SLACK.
APPLICATION FILED APR. 23. I914.
Patented May 7,1918.
' STATES PATENT orr on. i
CLARK T. HENDEESON, OF MILWAUKEE, WISCONSIN, ASSIGNOB TO THE CUTLER- HAMHEB MFG. 00., OF MILWAUKEE, WISCONSIN, A CORPORATION OF WIS- CON SIN DEVICE FOR TAKING UP AND PAYING OUT SLACK.
To all whom may concern: Be it known that I, CLARK a citizen of the United States, residing at llfilwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Im rovements in Devices for Taking Up and 1 aying Out Slack, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification,
This invention relates to improvements in devices for taking up and paying out slack and is particularly applicable to machines having a plurality of sets of rolls through which a strip of fabric or other material is passed progressively and wherein a slack in the material is produced between ad acent sets of rolls either through non-uniformity of the-peripheral s eeds of the rolls or,
through slippage of t ematerial,etc. Other advantageous uses of the invention will, however, be obvious. V
The various objects and advantages of the invention will be apparent from the embodiment thereof schematically illustrated in the accomnanvin drawin and now tobe described.
in the drawing,
Figure 1 schmatically illustrates one form of the invention used in connection with a mechanism of the aforesaid character; and,
Fig. 2 illustrates schematically a modification of the slaok-mechanismshown in Fi 1., Y fieferring more specifically to Fig. 1 the "same schematically illustrates three sets of rolls 1, 2 and 3, acting progressivelyup'on a strip 4 of fabric or the like passing thereof rolls. In addition the drawing schematically illustrates two sets of rollers 8, 9 and 10 arranged in a triangular relation, one set being located between the gripping rolls 1 and 2 and the other between the grippingrolls 2and 3. The fabric upon leaving the rolls 1 passes beneath the roller 8 over the Specification of Letters Patent. A Application filed Apri123, 1914. Serial No. 833,970.
T. HENDERSON,
Patented May '7, 1918.
Each of the rollers 9 is supported by one or more cables 12 connected to a drum 13 o eratively connected to the armature of an e ectric motor 14. The motors 14 are shown as of the series type, each being provided Withan armature A. and a field winding F. Each is connected across a supply circuit 15-16 through a regulating resistance R and thus exerts a constant torque tending to wind up its cable 12 and thereby raise its roller 9. The resistances R, however, are variable and are so adjusted as to avoid an undue strain on the fabric and to permit the drums to pay out cable as'the slack in the fabric decreases I It will thus be observed that the slack mechanisms are self-adjusting to increases in slack and are automatically adjusted by the tension of the fabric itself to decreases in slack, whereby their action is entirely automatic Also it will be observed that the slack is alwaysmaintained under a uni-.
form tension;
As will now be apparent, the rollers 9 may in practice have only a limited range of adjustment, and under such conditions,
should the slack in the fabric exceed a certain amount, said rollers would not adequately compensate therefor. However, in the arrangement illustrated, means are provided to insure against such conditions. In brief, means are provided to automatically decrease the speed of the rolls 1, should the slack in the fabric between the rolls 1 and 2 tend to exceed a predetermined amount and to automatically increase the speed of the rolls 3 should the slack in the fabric between the rolls 2 and 3 tend to' exceed a predetermined amount. The decrease in speed of the rolls'l obviously slackens the feed of the fabric to the rolls 2 and in consequence decreases the slack produced between said sets of rolls. the increase in speed of the rolls 3 accelerates On the other hand.
the passage of the fabric therethrough and in consequence decreases the slack between the same andthe rolls 2. Also, means are provided to restore the rolls 1 and 3 to their respective normal speeds after the slack has been restricted to a predetermined degree. This in turn tends to maintain a given amount of slack. ment it will be observed that the rolls 2 may be permitted to operate at constant speed re 'ardless of slack conditions.
ore specifically describing the aforesaid automatic control, the motors 5 and 7 are shown as of the shunt type and are each provided with a resistance R to be included incircuit with shunt field winding F thereof. At normal running speed of the motor 5 its resistance R is included in circuit while at normal running speed of the motor 7 its resistance R is excluded from circuit by a switch 18. The resistance R of the motor 5 is also provided with a shortcircuiting switch 19 and said switches 18 and 19 are operable by spaced collars 20 and 21 provided on the cables 12 of the two slack mechanisms. The arrangement is such that when the left hand roller 9 rises to a predetermined position the collar 20 on its cablev strikes the switch 19 to close the same, whereas upon descent of said roller to a predetermined position the collar 21 strikes the switch 19 to restore the same to open position. This cycle of operation, as will be readily understood, efiects slow-down and reacceleration of the motor 5. The cycle of operation of the switch 18 is just the reverse of that of switch 19. When the right hand roller 9 rises to a predetermined position the collar 20 strikes the switch 18 to open the same, thereby including the resistance R in circuit and accelerating the motor 7. Gonversely, when the roller descends the collar 21 strikes the switch 19 to closethe same, thereby short-circuiting the resistance lit and slowing down the motor '5. Thus the two motors 5 and 7 are controlled entirely automatically and in such a manner that the speed of either may be varied entirely inde: pendently of the other, or both may be regulated simultaneously, in accordance with the slack conditions to be rectified. The slack mechanism illustrated in Fig. 2 has a similar adjustable roller 9 and supporting cable 12, but in this instance said cable is looped over a drum 22 and has connected to its free end, a weight 23. The weight 23 tends to lift the roller 9 but permits said roller to yield under the tension of the fabric as the slack in the latter falls off. The weight thus acts similarly to the motor 1 of Fig. 1. This arrangement, however, is supplemented by a shunt motor 24 having its armature A operatively connected to the drum 22 and actin under certain conditions to electrically bra e said drum and under With this arrangeother conditions, to operate said drum.
More specifically, the motor 24 has its field winding F connected across a supply circuit 2526 and has its armature connected in a closed loop, including a resistance R with a line connection for said loop controlled by a switch 27 and including a. regulating resistance R Thus with the switch 27 open the motor 24: will act as 'a dynamic brake when its armature is driven by the drum 22. The resistance R however, is so proportioned as to practically nullify the braking effect of the motor when its armature is rotated at a relatively slow speed. In consequence, the drum 22 may be rotated under the action of the weight 23 to raise the roller 9 gradually without retardation by the motor, but should the weight 23 tend to raise the roller 9 rapidly, as in the case of a sudden increase in slack, then the motor would become effective as an electric brake thus braking the movement of the weight 23 and roller 9.
As will be apparent, when the mechanism is not in use the weight raises the roller 9 to its upper limit so that it is desirable to lower the roller for threading the fabric through the mechanism. As shown, this may be readily accomplished by closing the switch 27. I This starts the motor 2 1 in a direction to turn the drum 22 in a counterclockwise direction, thereby lifting the weight '23 and allowing the roller 9 to descend. Then when the fabric is threaded through the mechanism the switch 27 is opened, leaving the motor free to act as a dynamic brake, as aforesaid.
Ubviousl the slack mechanism shown in Fig. 2 mig t be substituted forthat shown in Fig. l to cooperate in the same manner IltlO member engaged by the controlled material and yielda le in one direction to the pull thereof and means associated with said member to exert a constant pull thereon in an opposite direction and to restrict the speed of its movement in the latter direction.
2. In a device for taking up and paying out slack, in combination, a plurality of rollers, one being adjustable relative to another and automatic adjusting means for said adjustable roller including an electric motor,
said motor under certain conditions acting as a dynamic brake.
' 3. Ina device for taking up and paying out slack, in combination; an adjustable member, means associated therewith to exert a constant pull thereon in one direction and an electric motor for operating the same in an opposite direction, said motor also acting responsive to variations in slack to vary the speed of the end Sets of rolls in inverse relation upon corresponding variations in slack between the same and the intermediate set of rolls.
5. In combination, a mechanism including 1 three sets of power-operated rolls feeding material from one to another in progression and at relatively different speeds and means responsive to variations in slack to vary the speed of the end set of rolls in inverse relation upon corresponding variations in slack between the same and the intermediate setz of rolls, said means controlling said end sets of rolls independently of one another.
In witness whereof, I have hereunto subscribed my name in the presence of two witnesses.
CLARK T. HENDERSON.
Witnesses:
TEKLA BAST, L. A. WATSON.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US83397014A US1265328A (en) | 1914-04-23 | 1914-04-23 | Device for taking up and paying out slack. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US83397014A US1265328A (en) | 1914-04-23 | 1914-04-23 | Device for taking up and paying out slack. |
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US1265328A true US1265328A (en) | 1918-05-07 |
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US83397014A Expired - Lifetime US1265328A (en) | 1914-04-23 | 1914-04-23 | Device for taking up and paying out slack. |
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Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2525600A (en) * | 1944-01-29 | 1950-10-10 | Beloit Iron Works | Tension control device |
US2708256A (en) * | 1946-10-24 | 1955-05-10 | Bendix Aviat Corp | Motor slack take-up and tensioning mechanism for travelling flexible member |
US2708554A (en) * | 1950-07-29 | 1955-05-17 | Remington Rand Inc | Tape drive and recording apparatus |
US2741176A (en) * | 1951-06-13 | 1956-04-10 | Alton Box Board Co | Tension control means in rotary presses for printing and blanking |
US2900143A (en) * | 1954-09-20 | 1959-08-18 | Mckay Machine Co | Brake control for uncoiler |
US2949295A (en) * | 1957-08-08 | 1960-08-16 | Huck Co | Web tension control mechanism |
US2949799A (en) * | 1956-09-25 | 1960-08-23 | United States Steel Corp | Gage-control system for multi-stand strip mill |
US3033140A (en) * | 1959-02-24 | 1962-05-08 | Horne | Apparatus for automatically winding and/or unwinding web material under uniform tension |
US3048389A (en) * | 1959-12-14 | 1962-08-07 | Avco Corp | Blueprint folding machine |
US3070048A (en) * | 1960-03-16 | 1962-12-25 | Coats & Clark | Method of synchronizing sewing machine operation with operation of casting machine |
US3227347A (en) * | 1964-03-31 | 1966-01-04 | Wean Engineering Co Inc | Apparatus for controlling the tension in a strip advancing continuously in a strip processing line |
US3236353A (en) * | 1961-11-27 | 1966-02-22 | Soroban Engineering Inc | Strip-printer punch |
US3249315A (en) * | 1964-05-27 | 1966-05-03 | Walco Electric Company | Adjustable dancer roll for a tension winding mechanism |
US3307015A (en) * | 1963-06-17 | 1967-02-28 | San Etsu Kinzoku Kogyo Kabushi | Continuous heat treating apparatus for metal strips |
DE1236637B (en) * | 1962-11-30 | 1967-03-16 | Siemens Ag | Device for driving a looper for roller lines |
US3521367A (en) * | 1968-08-15 | 1970-07-21 | United States Steel Corp | Material level indicator |
US3604605A (en) * | 1969-04-17 | 1971-09-14 | New England Merchants National | Tape-punching apparatus including a braking device |
US4474321A (en) * | 1981-09-29 | 1984-10-02 | Mitsubishi Denki Kabushiki Kaisha | Control unit for driving plural loopers |
US5060683A (en) * | 1988-08-18 | 1991-10-29 | Continental Installers Corporation | Tension control for strip pickling |
DE202007012920U1 (en) * | 2007-09-14 | 2009-02-19 | Winter, Helmut | Waterless toilet |
DE202010009966U1 (en) | 2010-07-06 | 2011-10-26 | Michael Winter | Waterless mobile film hose toilet |
DE202011001413U1 (en) | 2011-01-12 | 2012-04-17 | Michael Winter | Waterless compact mobile film hose toilet |
DE202011104936U1 (en) | 2011-08-29 | 2012-12-03 | Michael Winter | Waterless, low-odor mobile film hose toilet |
CN111065592A (en) * | 2017-09-19 | 2020-04-24 | 住友重机械工业株式会社 | Coil processing system and control method |
-
1914
- 1914-04-23 US US83397014A patent/US1265328A/en not_active Expired - Lifetime
Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2525600A (en) * | 1944-01-29 | 1950-10-10 | Beloit Iron Works | Tension control device |
US2708256A (en) * | 1946-10-24 | 1955-05-10 | Bendix Aviat Corp | Motor slack take-up and tensioning mechanism for travelling flexible member |
US2708554A (en) * | 1950-07-29 | 1955-05-17 | Remington Rand Inc | Tape drive and recording apparatus |
US2741176A (en) * | 1951-06-13 | 1956-04-10 | Alton Box Board Co | Tension control means in rotary presses for printing and blanking |
US2900143A (en) * | 1954-09-20 | 1959-08-18 | Mckay Machine Co | Brake control for uncoiler |
US2949799A (en) * | 1956-09-25 | 1960-08-23 | United States Steel Corp | Gage-control system for multi-stand strip mill |
US2949295A (en) * | 1957-08-08 | 1960-08-16 | Huck Co | Web tension control mechanism |
US3033140A (en) * | 1959-02-24 | 1962-05-08 | Horne | Apparatus for automatically winding and/or unwinding web material under uniform tension |
US3048389A (en) * | 1959-12-14 | 1962-08-07 | Avco Corp | Blueprint folding machine |
US3070048A (en) * | 1960-03-16 | 1962-12-25 | Coats & Clark | Method of synchronizing sewing machine operation with operation of casting machine |
US3236353A (en) * | 1961-11-27 | 1966-02-22 | Soroban Engineering Inc | Strip-printer punch |
DE1236637B (en) * | 1962-11-30 | 1967-03-16 | Siemens Ag | Device for driving a looper for roller lines |
US3307015A (en) * | 1963-06-17 | 1967-02-28 | San Etsu Kinzoku Kogyo Kabushi | Continuous heat treating apparatus for metal strips |
US3227347A (en) * | 1964-03-31 | 1966-01-04 | Wean Engineering Co Inc | Apparatus for controlling the tension in a strip advancing continuously in a strip processing line |
US3249315A (en) * | 1964-05-27 | 1966-05-03 | Walco Electric Company | Adjustable dancer roll for a tension winding mechanism |
US3521367A (en) * | 1968-08-15 | 1970-07-21 | United States Steel Corp | Material level indicator |
US3604605A (en) * | 1969-04-17 | 1971-09-14 | New England Merchants National | Tape-punching apparatus including a braking device |
US4474321A (en) * | 1981-09-29 | 1984-10-02 | Mitsubishi Denki Kabushiki Kaisha | Control unit for driving plural loopers |
US5060683A (en) * | 1988-08-18 | 1991-10-29 | Continental Installers Corporation | Tension control for strip pickling |
DE202007012920U1 (en) * | 2007-09-14 | 2009-02-19 | Winter, Helmut | Waterless toilet |
DE202010009966U1 (en) | 2010-07-06 | 2011-10-26 | Michael Winter | Waterless mobile film hose toilet |
DE202011001413U1 (en) | 2011-01-12 | 2012-04-17 | Michael Winter | Waterless compact mobile film hose toilet |
DE202011104936U1 (en) | 2011-08-29 | 2012-12-03 | Michael Winter | Waterless, low-odor mobile film hose toilet |
CN111065592A (en) * | 2017-09-19 | 2020-04-24 | 住友重机械工业株式会社 | Coil processing system and control method |
US20200215814A1 (en) * | 2017-09-19 | 2020-07-09 | Sumitomo Heavy Industries, Ltd. | Processing system and control method for handling continuous sheet of material |
CN111065592B (en) * | 2017-09-19 | 2022-04-26 | 住友重机械工业株式会社 | Coil processing system and control method |
US11472173B2 (en) * | 2017-09-19 | 2022-10-18 | Sumitomo Heavy Industries, Ltd. | Processing system and control method for handling continuous sheet of material |
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