US3480191A - Drive means for a cylinder processing machine - Google Patents

Drive means for a cylinder processing machine Download PDF

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Publication number
US3480191A
US3480191A US667163A US3480191DA US3480191A US 3480191 A US3480191 A US 3480191A US 667163 A US667163 A US 667163A US 3480191D A US3480191D A US 3480191DA US 3480191 A US3480191 A US 3480191A
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Prior art keywords
web
cylinder
tension
drive
drive means
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Expired - Lifetime
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US667163A
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English (en)
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Cornelis Johannes
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Individual
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/14—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning

Definitions

  • the drive means include a plurality of hydro-motors which are connected in parallel relation to a pump, as well as a calibrating device positioned in the path of flow of each hydro-motor and an electric control device likewise connected to said pump, the arrangement being such that the web is kept substantially free of tension from input to output.
  • the present invention relates to a drive for a cylinder machine in which a web of material is passed over a plurality of processing cylinders, which web may undergo a change in length owing to this processing.
  • Machines of this type are used for several purposes, such as the drying of paper webs, fabric webs, and yarn strands, the heating of webs impregnated with synthetic material up to temperature for the benefit of polymerization, the thermofixing of dyes in webs, and the like. For simplicitys sake only the use as a cylinder drying machine will be referred to hereinafter.
  • a drive means for a cylinder drying machine in which it is tried to adapt the number of revolutions to the speed of the relevant web portion in a dilferent manner is known from Netherlands patent specification No. 82,379.
  • This so-called relax-drive is based on this that instead of a rigid belt a flexible drive means is used. Although, superficially, this looks like a so-called tension-poor drive, this is not so in reality.
  • this invention is characterized in that the drive means is composed of a plurality of hydromotors for driving the drying cylinders, and of a pump having a controllable pumping yield, said hydromotors being connected to said pump in parallel relationship, and of a calibrating device provided in the path of flow of each hydro-motor, and a control device which is connected to said pump and by which the feed web portion is kept nearly free of tension, the whole being so calibrated that also the web portion at the output end has little tension.
  • FIG. 1 is a diagrammatic view of a cylinder drying machine in illustration of the conditions which this machine for substantially tension-free drying has to meet;
  • FIG. 2 shows a schematic diagram in illustration of the automatic diflerential action applied to the hydraulic drive according to this invention
  • FIG. 3 is a more detailed diagrammatic view of the hydraulic drive according to this invention.
  • FIG. 4 shows an embodiment of the apparatus according to this invention.
  • the web If the web is passed over a plurality of heated drying cylinders, of which seven are shown in FIG. 1, it will undergo a change in its length during the drying process. In a drying process in which it ha been achieved to complete the drying entirely or substantially free of tension, the change in length A1, will have a negative character because of shrinkage.
  • v represents the web rate and D the diameter of the cylinder.
  • the length may be expected to change continually, it will not only be necessary for the factor i to be selected as high as possible "with a given required, total heating surface area (wherein i is the number of drying cylinders and P the contact surface per drying cylinder), but the speed of each drying cylinder will have to be adapted to the change in the web rate caused by the change in length owing to partial drying.
  • cylinder speed 12 will in general have to vary with each cylinder.
  • n #n #n n applies, because these web rates again differ from the input and output web rates v and v,, respectively.
  • a cylinder speed must be entirely adapted to the local web rate effected by the change in web length.
  • a driven cylinder must not be influenced by the drive of another cylinder.
  • the web supply at the input end of the machine must be in synchronism with the web rate on the first cylinder. As can be easily seen, too low a fed rate not only causes a cloth tension in the input web portion and/ or slip on the cylinders, but the drying machine drive is forced to produce a higher energy than is required for the web transport alone, which again results in tensions in the web portions between the respective cylinders.
  • a hydraulic drive having an automatic differential action is applied.
  • the principle of such drive is known per se, but will be briefly discussed hereinbelow, after which a reflection will be given to what extent such drive is useful for the transport of a web through a cylinder drying machine.
  • n is the no-load speed and M and M respectively, the torques occurring under loaded condition.
  • a drive of this type is in itself certainly not worse than any other one of the equipmetns discussed before. Yet an additional, not to be neglected, advantage is obtained by the simple speed control across a wide range by means of the control of the pumping capacity.
  • FIG. 4 shows a nearly tension-free hydraulic drive for a cylinder drying machine according to this invention.
  • each hydro-motor is provided with a known-per-se throttling device.
  • This throttling device which may, for example, consist of a tap or a needle valve, may be disposed either at the input end or at the output end, though from a practical point of view the outlet end is mostly preferred, as is shonw by S in FIG. 4.
  • the preferably dynamically balanced drying cylinders after the assembly, must be set into motion by means of pump P without a web being passed through the machine, it will turn out that not only the various hydro-motors will start turning at different speeds, but one or more of the motors will continue to stand still, owing to the differences in the required energy A, as referred to under condition B.
  • the throttling device S allows of a change in the various resistances so that each cylinder in the unloaded condition set rotating at exactly the same speed.
  • a second characteristic feature of the apparatus according to this invention is that there are provided at the input end of the drying machine two photo-electric cells phl and ph2 for controlling the web feed in such a manner that with too high a web rate in the drying machine relative to the feed rate the photocell phl emits a signal through an amplifier to the control mechanism r of the pump P so as to adjust the pumping yield at a lower value. Conversely, with too low a web rate relative to the feed rate the control mechanism will receive a signal from the photocell p122 so as to increase the pumping yield. 'If desired, a dancer control roller could be used for this, although it would cause some tension in the web.
  • this photocell receiver there may be used a converter of ultrasonic sound waves into electric signals.
  • the hydraulic drive according to the invention is entirely automatically adapted to each feed rate, wtihout web tensions occurring at the input end, while the machine, even from a condition of standstill, could be controlled at the proper web rate.
  • Drive means for a cylinder processing machine in which a web of material is passed over a plurality of processing cylinders comprising a plurality of hydro-motors for driving said processing cylinders, a pump having a controllable pumping yield, said hydro-motors being connected to said pump in parallel relationship, calibrating means provided in the path of flow of each hydro-motor, and control means connected to said pump for maintaining the feed portion of the web substantially free of tension, and said calibrating means being so calibrated that the web portion at the output end of the machine is under relatively little tension.
  • control means comprises an electric control device in cluding a receiver responsive to the slackness at the feed portion of the web for providing an electrical signal representative of such slackness and said receiver being mechanically separated from the feed portion of said web.
  • said receiver comprises a plurality of photocells and associated light sources, a first of said photocells being responsive to slackness in the feed portion of the web for providing a signal and a second of said photocells being responsive to excess tension in the feed portion of the web for providing a signal.
  • Drive means for a cylinder processing machine of the type employing a plurality of cylinders over which a web is entrained said drive means comprising a plurality of fluid driven motors for driving said plurality of cylinders, pump means for supplying fluid to said fluid driven motors, said motors being connected in parallel across said pump means, calibrating means in fluid communication for restricting fluid flow therethrough whereby actuation of said fluid driven motors imparts differential speeds to said cylinders to provide a low tension level in said web, and web sensing means responsive to the degree of tension in said web at the input to said cylinders and connected to said pump means for varying the output of said pump means in response to variations in the tension in the web.
  • said cali brating means comprises valve means in fluid communication with said number of fluid driven motors for sequentially decreasing the output speeds of said fluid driven motors.
  • valves increasingly restrict fluid flow through said fluid driven motor means along the length of feed of said web for sequentially decreasing the speed imparted to said cylinders.
  • Drive means for a cylindrical processing machine of the type employing a plurality of cylinders over which a web is entrained said drive means comprising a plurality of fluid driven motors for driving said plurality of cylinders, pump means for supplying fluid to said fluid driven motors, said motors being connected in parallel across said pump means, calibrating means in fluid communication with a number of said motors for restricting fluid flow therethrough whereby actuation of said fluid driven motors imparts differential speeds to said cylinders to provide a low tension level in said web, said pump means comprising a variable pump for varying the amount of fluid supplied to said fluid driven motors, said drive means further comprising control means for controlling the output of said variable pump in response to increases and decreases in tension in said web where said web enters said cylinders.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Fiber Materials (AREA)
US667163A 1966-09-13 1967-09-12 Drive means for a cylinder processing machine Expired - Lifetime US3480191A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6612911A NL6612911A (enrdf_load_html_response) 1966-09-13 1966-09-13

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US3480191A true US3480191A (en) 1969-11-25

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US667163A Expired - Lifetime US3480191A (en) 1966-09-13 1967-09-12 Drive means for a cylinder processing machine

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US (1) US3480191A (enrdf_load_html_response)
CH (1) CH471737A (enrdf_load_html_response)
FR (1) FR1567892A (enrdf_load_html_response)
NL (1) NL6612911A (enrdf_load_html_response)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3837550A (en) * 1972-05-25 1974-09-24 Gen Electric Roller conveying of strip material
US4685190A (en) * 1984-12-01 1987-08-11 Continental Gummi-Werke Aktiengesellschaft Method of operating an appparatus for producing conveyer belts

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3278100A (en) * 1964-03-20 1966-10-11 Armstrong Cork Co Web accumulator including means for modifying tension in web passing therethrough
US3338493A (en) * 1964-10-21 1967-08-29 Joh Kleinewefers Sohne Maschin Driving arrangement having primary and supplementary motor means for driving trains of mechanism, especially web material mechanism
US3381868A (en) * 1965-05-26 1968-05-07 Artos Meier Windhorst Kg Drive for devices treating movable lengths of materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3278100A (en) * 1964-03-20 1966-10-11 Armstrong Cork Co Web accumulator including means for modifying tension in web passing therethrough
US3338493A (en) * 1964-10-21 1967-08-29 Joh Kleinewefers Sohne Maschin Driving arrangement having primary and supplementary motor means for driving trains of mechanism, especially web material mechanism
US3381868A (en) * 1965-05-26 1968-05-07 Artos Meier Windhorst Kg Drive for devices treating movable lengths of materials

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3837550A (en) * 1972-05-25 1974-09-24 Gen Electric Roller conveying of strip material
US4685190A (en) * 1984-12-01 1987-08-11 Continental Gummi-Werke Aktiengesellschaft Method of operating an appparatus for producing conveyer belts

Also Published As

Publication number Publication date
FR1567892A (enrdf_load_html_response) 1969-05-23
NL6612911A (enrdf_load_html_response) 1968-03-14
CH471737A (de) 1969-04-30

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