US3015860A - Load arm for pressure rollers of draw frames - Google Patents

Load arm for pressure rollers of draw frames Download PDF

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Publication number
US3015860A
US3015860A US771800A US77180058A US3015860A US 3015860 A US3015860 A US 3015860A US 771800 A US771800 A US 771800A US 77180058 A US77180058 A US 77180058A US 3015860 A US3015860 A US 3015860A
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United States
Prior art keywords
arm
load arm
pressure rollers
load
rest position
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Expired - Lifetime
Application number
US771800A
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English (en)
Inventor
Stahlecker Fritz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wilhelm Stahlecker GmbH
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Wilhelm Stahlecker GmbH
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Filing date
Publication date
Application filed by Wilhelm Stahlecker GmbH filed Critical Wilhelm Stahlecker GmbH
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Publication of US3015860A publication Critical patent/US3015860A/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/46—Loading arrangements
    • D01H5/50—Loading arrangements using springs
    • D01H5/505—Loading arrangements using springs for top roller arms

Definitions

  • the present invention relates to improvements in draw frames of spinning machines, and more particularly to a guide and load armfor depressing the spring-loaded pressure rollers of a draw frame which are guided within such a load arm so as to extend parallel to the axes of the lower rollers and to be movable in a direction substantially vertical to the drawing plane.
  • FIGURE 5 shows a cross section taken along line V-V in FIGURE 4; while FIGURE 6 shows a spring means for retaining the releasearm of FIGURE 3 in retracted position.
  • the guide and load arm 1 has a plurality of guide members 2 adjustably secured thereto by bolts 3 which when loosened are slidable in slots 4.
  • Pressure rollers 5 of the draw frame which are made in the form of twin rollers are guided by means of brackets 6 on guide members 2 and are capable of moving between these brackets 6 in a direction substantially vertical to the drawing plane and parallel to the lower rollers 7.
  • the guide and load arm 1 is mounted in a known manner on a shaft 8 so as to be pivotable in an upward direction. When arm 1 is thus pivoted, the pressure rollers 5 are held withinguide members 2 by means of locking springs 9.
  • the load arm- 1 further carries a load-release arm 10 which is pivotably mounted thereon.
  • release arm 10 When in the operative position, release arm 10 will be pivoted backward and rest on load arm 1.
  • the release arm 10 will be pivoted forward about a bolt 11 on load arm 1 so as to be in a position 10', as indicated in FIGURE 1 in dotted lines, whereby the leverage for depressing load arm 1 will be considerably increased.
  • the operator of the loadarm so as to be either pivotable or slidable thereon and to be thus extensible relative to the load arm to increase the leverage of the latter.
  • a feature of the invention consists in making the loadrelease arm of a U-shaped cross section.
  • such U- shaped arm may be pivotably mounted at one end on the load arm so that, when the latter is in its operative position, the release arm will closely engage with and embrace the load arm.
  • the U-shaped release arm may form a slide member which embraces the side walls of the correspondingly U-shaped guide and lo'ad'arm and is slidable forwardly along the same to extend the leverage of the load arm.
  • FIGURE 1 shows a load arm according to the present invention in which the central and last pressure rollers which are supported in guide brackets are loaded by a common torsion spring, while the starting roller is loaded separately by another torsion spring;
  • FIGURE 2 shows a cross section taken along line lIII of FIGURE 1;
  • the arm 10, especially if made of a U-shaped cross section, may, however, also be designed in the form of a slide member which is guided along the side arms of the correspondingly U-shaped load and guide arm 1 by means of corrugations or guide bolts so as to be extensirelease arm in the form of a slide member 12 of a cording to the invention, in which the release arm forms U-shaped cross section in the retracted or rest position on load arm 1, while FIGURE 4 shows slide member 12 in the extended position.
  • slide member 12 On its upper surface, slide member 12 is provided with two longitudinal slots 13 and 14 in which the heads of bolts 3 slid'ably engage which secure guide members 2 of the pressure rollers 5 (see FIGURE 1) to load arm 1.
  • the forward movement of slide member 12 is limited by the rear end of slot 14 which engages with the head of the mounting bolt 3 of guide member 2 of the central pressure roller.
  • the rear end of load arm 1 is preferably provided with a tension spring 16 which releasably engages an indented portion 17 of the rear end of releasearm 12 for normally retaining the same in the retracted or rest position.
  • Theembodiment of the invention according to FIG- URES 3 to 5 has the additional advantage that, when the release arm 12 is in the retracted or rest position for the normal operation of load arm 1, it may also serve to increase the bending strength of load arm 1.
  • the free ends of the side walls of the U-shaped release arm 12 may be bent inwardly to engage underneath the lower edge of load arm 1, as indicated particularly at 15 in FIGURE 5.
  • This embracing portion 15 may be made either of a narrow width as shown in FIGURES 3 and 4 or it may serve as a bracing member along a part or the entire length of load arm 1.
  • the release arm 10 according to the embodiment shown in FIGURE 1 may also be secured on load arm 1 when in the unpivo-ted position as shown in full lines so as to serve as an additional reinforcement of load arm 1 during the operation of the draw frame.
  • a draw frame for spinning machines having parallel upper and lower pressure rollers, means for mounting said upper pressure roller-s so as to be adjustable in a substantially vertical direction relative to said lower pressure rollers, said means comprising a load arm, said upper pressure rollers being rotatably mounted on said load arm, means for mounting said load arm so as to be pivotable together with said upper pressure rollers relative to said lower pressure rollers, means for locking said load arm in the downward position, and means for releasing said load arm from its looked position, said last means including a second arm secured to said load arm but so as to be extensible therefrom to increase the leverage of said load arm, said second arm having a rest position on said load arm and comprising means embracing said load arm when said second arm is in said rest position.
  • a draw frame for spinning machines having parallel upper and lower pressure rollers, means for mounting said upper pressure rollers so as tobe adjustable in a substantially vertical direction relative to said lower pressure rollers, said means comprising a load arm, said upper pressure rollers being rotatably mounted on said load arm, means for mounting said load arm so as to be pivotable together with said upper pressure rollers relative to said lower pressure rollers, means for locking said load arm in the downward position, and means for releasing said load arm from its locked position, said last means including a second arm secured to said load arm but so as to be extensible therefrom to increase the leverage of said load arm, said second arm having a rest position on said load arm and comprising means embracing said load arm when said second arm is in rest position, said second arm being of an inverted U-shaped cross section and slidably mounted on said load arm so as to be movable thereon from said rest position to an extended position.
  • a draw frame for spinning machines having parallel upper and lower pressure rollers, means for mounting said upper pressure rollers so as to be adjustable in a substantially vertical direction relative to said lower pressure rollers, said means comprising a load arm, said upper pressure rollers being rotatably mounted on said load arm, means for mounting said load arm so as to be pivotable together with said upper pressure rollers relative to said lower pressure rollers, means for locking said load arm in the downward position, and means for releasing said load arm from its locked position, said last means including a second arm secured to said load arm but so as to be extensible therefrom to increase the leverage of said load arm, said second arm having a rest position on said load arm and comprising means embracing said load arm when said second arm is in rest position, means on said second arm for retaining said arm on said load arm at least in said rest position and for also reinforcing said load arm when the latter is in its operative position.
  • a draw frame for spinning machines having parallel upper and lower pressure rollers, means for mounting said upper pressure rollers so as to be adjustable in a substantially vertical direction relative to said lower pressure rollers, said means comprising a load arm, said upper pressure rollers being rotatably mounted on said load arm, means for mounting said load arm so as to be pivotable together with said upper pressure rollers relative to said lower pressure rollers, means for locking said load arm in the downward position, and means for releasing said load arm from its locked position, said last means including a second arm secured to said load arm but so as to be extensible therefrom to increase the lever-age of said load arm, said second arm having a rest position on said load arm and comprising means embracing said load arm when said second arm is in rest position, said second arm being slidably mounted on said load arm so as to be movable thereon from said rest position to an extended position, said means embracing said load arm constituting means for retaining said arm on said load arm at least in said rest position and for also reinforcing said load arm when the latter is in

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US771800A 1957-11-05 1958-11-04 Load arm for pressure rollers of draw frames Expired - Lifetime US3015860A (en)

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DE3015860X 1957-11-05

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US3015860A true US3015860A (en) 1962-01-09

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FR (1) FR1206521A (is")

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3278994A (en) * 1962-12-29 1966-10-18 Schurr Stahlecker & Grill Supporting and loading arm for the drawing mechanism of a spinning machine
US4985967A (en) * 1989-03-10 1991-01-22 Fritz Stahlecker Drafting unit for a spinning machine with movable cover
CN103014951A (zh) * 2011-09-21 2013-04-03 村田机械株式会社 牵伸装置及纺纱机械

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717426A (en) * 1952-01-30 1955-09-13 Casablancas High Draft Co Ltd Improvements in or relating to drafting mechanisms for textile fibres
US2746095A (en) * 1952-02-28 1956-05-22 Skf Kugellagerfabriken Gmbh Textile drawing mechanism

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717426A (en) * 1952-01-30 1955-09-13 Casablancas High Draft Co Ltd Improvements in or relating to drafting mechanisms for textile fibres
US2746095A (en) * 1952-02-28 1956-05-22 Skf Kugellagerfabriken Gmbh Textile drawing mechanism

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3278994A (en) * 1962-12-29 1966-10-18 Schurr Stahlecker & Grill Supporting and loading arm for the drawing mechanism of a spinning machine
US4985967A (en) * 1989-03-10 1991-01-22 Fritz Stahlecker Drafting unit for a spinning machine with movable cover
CN103014951A (zh) * 2011-09-21 2013-04-03 村田机械株式会社 牵伸装置及纺纱机械
CN103014951B (zh) * 2011-09-21 2016-06-29 村田机械株式会社 牵伸装置及纺纱机械

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Publication number Publication date
FR1206521A (is") 1960-02-10

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