US3028636A - Cradle for top rolls of double apron drafting arrangements - Google Patents

Cradle for top rolls of double apron drafting arrangements Download PDF

Info

Publication number
US3028636A
US3028636A US21839A US2183960A US3028636A US 3028636 A US3028636 A US 3028636A US 21839 A US21839 A US 21839A US 2183960 A US2183960 A US 2183960A US 3028636 A US3028636 A US 3028636A
Authority
US
United States
Prior art keywords
cradle
apron
aprons
reversal
bar
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
Application number
US21839A
Other languages
English (en)
Inventor
Schiltknecht Adolf
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.)
Joh Jacob Rieter und Cie AG
Original Assignee
Joh Jacob Rieter und Cie AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Joh Jacob Rieter und Cie AG filed Critical Joh Jacob Rieter und Cie AG
Application granted granted Critical
Publication of US3028636A publication Critical patent/US3028636A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • D01H5/26—Drafting machines or arrangements without fallers or like pinned bars in which fibres are controlled by one or more endless aprons

Definitions

  • the guidance of the fibres in a double apron drafting arrangement is the better the more exactly the dimensions of the aprons can be correlated to the spacing conditions between the top rollers and the cradle, particularly the reversal bar of the latter.
  • tolerances of only a few tenths of a millimeter as to the lengths of the apron have been found to be absolutely essential. To so exactly manufacture the aprons is very expensive and difficult.
  • the tensioning device for the upper apron according to the invention overcomes the aforedescribed shortcomings.
  • a resilient element is mounted on a cradle of the type, for example, as disclosed in Patent No. 2,941,262, the element acting on the run of the apron which does not guide fibres, thereby tensioning the apron.
  • the increased tension of the upper apron produced by the new device makes it possible to use double apron drafting arrangements for working long fibre staple.
  • the relatively little stiffness of long upper aprons as they are required for long staple drafting arrangements causes billowing and an insufficient guide effect of the upper apron. If the apron is tensioned according to the invention, such billowing is entirely prevented.
  • FIG. 1 is a cross sectional view of a cradle equipped with a tensioning device according to the invention, the section being taken along line I-I in FIG. 2.
  • FIG. 2 is a top view of the left half of the cradle and tensioning device shown in FIG. 1.
  • FIG. 3 is a front view of a portion of a cradle provided with a modified tensioning device according to the invention.
  • FIG. 4 is a plan view of the device shown in FIG. 3;
  • FIG. 5 is a front view of the left half of a cradle provided with a third modification of a tensioning device according to the invention.
  • FIG. 6 is a plan view of the device shown in FIG. 5.
  • FIG. 7 is a cross sectional view of a cradle provided with a tensioning device according to the invention.
  • numeral 1 designates a main cradle portion resting on an axle 21 connecting the two bosses 22 of a top roll, only one boss being shown.
  • the cradle 1 of which only a part is shown in FIG. 2 is made of one piece and includes a reversal bar 5 having a rounded front edge 5 on which the run of an apron 23 is reversed.
  • the cradle has a central mounting or bearing portion including a bracket 30 laterally extending from the bar 5 and partly surrounding the top roll axle 21.
  • the bracket includes axle retaining flaps 31 which are individually provided with a plane bearing surface 32 whose plane is disposed at an angle with respect to a plane bearing surface portion 33 of the bracket 30.
  • the planes of the bearing surfaces 32 and 33 are parallel to the front edge 5' of the reversal bar 5.
  • the bracket 39 is made of resilient material and is not permanently deformed by the slight bending required for moving the axle 21 between the surfaces 32 and 33 when the axle 21 is mounted on or removed from the cradle 1.
  • the nose bar or reversal bar 5 is held in down position by conventional means, for example, a spring 34 received in a suitable recess of a saddle 35 for the top roll assembly.
  • the spring 34 has ends inserted in recesses 36, 37 in the saddle 35 and is provided with an extension 38 laid around the forward end 39 of the saddle and having a looped end 40 slightly pressing against the top of the reversal bar 5.
  • a spacer element 42 is mounted on a reversal bar 43 for the lower aprons between the latter, the reversal bar 5 resting on the element 42.
  • the cradle 1 is provided with a tensioning plate spring 2, the lower part of which is inserted in a longitudinal recess in the upper side of the reversal bar 5 and made fast thereon by means of rivets 6. Other means, such as spot welding, may be used instead of rivets.
  • the upper part 7 of the spring 2 has a surface over which the apron 23 slides, the part 7 being so bent that this surface substantially' coincides with the running direction of the upper run of the apron 23.
  • the apron 23 is uniformly tensioned by means of the plate spring 2.
  • the apron is laterally guided by a U-shaped guide piece 9 which is welded to the underside of the portion 7 of the spring 2 as is indicated in FIG.
  • the upright flaps 12 of the guide piece 9 have an inclined front edge 24 at the side where the apron 23 enters the guide piece. This causes transport of the loose fibres, projecting beyond the sides of the apron, by-the apron over the flaps 12.
  • the spring 2 is somewhat less wide than the apron 23 which is substantially as wide as the covering of the top roll 22. Therefore, the marginal portions of the inside surface of the apron are free, i.e., do not contact the spring 2. Therefore, the fibres adhering to the edge of the apron are not wiped off by the transverse portion of the guide piece 9 but are moved upward and out by the guide piece. This prevents accumulation of fly.
  • a single plate spring 13 may be riveted to the center of the cradle l by a rivet 25, the spring 13 having two arms which gradually rise from the cradle 1, as shown in FIGS. 3 and 4. Each arm of the spring 13 extends somewhat beyond the middle of the respective apron. The arms are somewhat twisted toward the reversal edge 26 of the cradle 1.
  • An apron guide 14 is mounted on the end portion of each arm and made fast by a rivet 15.
  • the guides 14 have the same configuration as the guides 9 in FIGS. 1 and 2.
  • the inclination of the guides is determined by the twist of the arms of the spring 13.
  • any other suitable connection may be used.
  • FIGS. 5 and 6 illustrate an embodiment of the invention in which a plate spring 16 is provided for each apron, the springs being connected to the underside of the reversing portion of the cradle 1 by rivets 17 and being looped around the lateral ends of the cradle.
  • the free end of each plate spring 16 is twisted to support an apron guide 18 in the desired position.
  • the guide pieces 18 are connected to the springs by rivets 27 or other suitable means.
  • FIG. 7 produces the desired tensioning or positioning of the apron without the use of plate springs.
  • a resilient pressure body 19 made of sufficiently elastic sponge rubber as is now available is mounted to the top of the reversal portion 5 of the cradle 1, preferably by an adhesive as is now also available.
  • the element 20 which has a similar configuration as the element 9 in FIGS. 1 and 2 is preferably made of a synthetic material which otters little friction of the rubber apron 23.
  • the tensioning devices shown in FIGS. 1 to 6 may be mounted to the cradle by means of an adjustable screw instead of a rivet so that the tensioning effect can be adjusted.
  • a cradle for the top aprons of a double apron drafting arrangement of a spinning machine comprising a main cradle portion including a reversal bar, a bracket laterally extending from said reversal bar and being adapted to rest on the axle interconnecting the two bosses of a top roll, and two endless aprons of unchangeable length extending around the top roll and the reversal bar, said bracket forming a bearing for the top roll axle, said bearing including two substantially plane bearing surfaces placed at an angle with respect to each other and in fixed parallel relation to the line of contact of the aprons with said reversal bar: resilient apron positioning means connected to said main cradle portion and including two end portions, each end portion abutting against and slidingly engaging the upper run of one of said top aprons for accurately positioning the lower run of the respective apron between the top roll and the reversal bar,
  • a cradle for the top aprons of a drafting arrangement of a spinning machine comprising a main cradle portion including a reversal bar, a bracket laterally extending from said reversal bar and being adapted to rest on the axle interconnecting the two bosses of a top roll, and two endless aprons of unchangeable length extending around the top roll and the reversal bar, said bracket forming a bearing for the top roll axle, said bearing including two bearing surfaces placed in fixed parallel relation to the line of contact of the aprons with the reversal bar: two apron positioning elements, each element having a first portion mounted on said main cradle portion, each positioning element including a second portion slidingly engaging the upper run of one of said aprons, and a resilient intermediate portion extending between said first portion and said second portion for pressing the second portion against the respective apron for accurately positioning the lower run of the respective apron between the top roll and the reversal bar.
  • a cradle for the top aprons of a double apron drafting arrangement of a spinning machine comprising a main cradle portion including a reversal bar, a bracket laterally extending from said reversal bar and being adapted to rest on the axle interconnecting the two bosses of a top roll, and two endless aprons of unchangeable length extending around the top roll and the reversal bar, said bracket forming a bearing for the top roll axle, said bearing including two substantially plane bearing surfaces placed at an angle with respect to each other and in fixed parallel relation to the line of contact of the aprons with said reversal bar: two apron positioning means connected in spaced relation to said main cradle portion, each positioning means having a resilient portion made of sponge rubber and a portion having a smooth surface abutting against and slidingly engaging the upper run of one of said top aprons for accurately positioning the lower run of the respective apron between the top roll and the reversal bar.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US21839A 1955-12-02 1960-04-12 Cradle for top rolls of double apron drafting arrangements Expired - Lifetime US3028636A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH337762T 1955-12-02

Publications (1)

Publication Number Publication Date
US3028636A true US3028636A (en) 1962-04-10

Family

ID=4504403

Family Applications (1)

Application Number Title Priority Date Filing Date
US21839A Expired - Lifetime US3028636A (en) 1955-12-02 1960-04-12 Cradle for top rolls of double apron drafting arrangements

Country Status (4)

Country Link
US (1) US3028636A (enrdf_load_stackoverflow)
CH (1) CH337762A (enrdf_load_stackoverflow)
DE (1) DE1056014B (enrdf_load_stackoverflow)
GB (1) GB812335A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3303534A (en) * 1963-08-21 1967-02-14 S O M Andreani & C Double apron drafting system for drawing frames

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1098417B (de) 1957-11-15 1961-01-26 Skf Kugellagerfabriken Gmbh Spannvorrichtung fuer ein in einem Riemchenkaefig mit starrer Wendeschiene gefuehrtes Oberriemchen fuer Spinnereimaschinen-Streckwerke
DE1115160B (de) 1957-11-15 1961-10-12 Skf Kugellagerfabriken Gmbh Spannvorrichtung fuer Oberriemchen an Spinnereimaschinenstreckwerken
DE1114417B (de) 1958-03-31 1961-09-28 Wuerttembergische Spindelfabri Doppelriemchenstreckwerk fuer Spinnereimaschinen
DE1137362B (de) 1960-03-03 1962-09-27 Ernst Toenniessen Doppelriemchenstreckwerk fuer Spinnmaschinen

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US252826A (en) * 1882-01-24 Harvester
US594636A (en) * 1897-11-30 Grain-harvester elevator
GB191212477A (en) * 1911-05-27 1913-02-20 Fernando Casablancas Improved Mechanism for Drawing Fibres and the like in Textile Machines.
US1914603A (en) * 1931-05-28 1933-06-20 Whitin Machine Works Long draft spinning mechanism
US2180325A (en) * 1935-09-04 1939-11-14 Toenniessen Ernst Drawing frame for textile fibers
US2708290A (en) * 1951-11-30 1955-05-17 Skf Kugellagerfabriken Gmbh Double belt drawing mechanism
US2908043A (en) * 1955-04-14 1959-10-13 American Viscose Corp Converting bulk filament into staple fiber
US2941262A (en) * 1955-05-18 1960-06-21 Rieter Joh Jacob & Cie Ag Cradle for top rolls of double apron drafting arrangements

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE352764C (de) * 1920-01-22 1922-05-04 Fernando Casablancas Streckwerk
US1559281A (en) * 1924-05-10 1925-10-27 Rushton James Lever Drawing mechanism for ring-spinning frames and the like
FR1484462A (enrdf_load_stackoverflow) * 1965-06-25 1967-09-15

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US252826A (en) * 1882-01-24 Harvester
US594636A (en) * 1897-11-30 Grain-harvester elevator
GB191212477A (en) * 1911-05-27 1913-02-20 Fernando Casablancas Improved Mechanism for Drawing Fibres and the like in Textile Machines.
US1914603A (en) * 1931-05-28 1933-06-20 Whitin Machine Works Long draft spinning mechanism
US2180325A (en) * 1935-09-04 1939-11-14 Toenniessen Ernst Drawing frame for textile fibers
US2708290A (en) * 1951-11-30 1955-05-17 Skf Kugellagerfabriken Gmbh Double belt drawing mechanism
US2908043A (en) * 1955-04-14 1959-10-13 American Viscose Corp Converting bulk filament into staple fiber
US2941262A (en) * 1955-05-18 1960-06-21 Rieter Joh Jacob & Cie Ag Cradle for top rolls of double apron drafting arrangements

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3303534A (en) * 1963-08-21 1967-02-14 S O M Andreani & C Double apron drafting system for drawing frames

Also Published As

Publication number Publication date
GB812335A (enrdf_load_stackoverflow) 1959-04-22
CH337762A (de) 1959-04-15
DE1056014B (de) 1959-04-23

Similar Documents

Publication Publication Date Title
US5027476A (en) Bearing and loading arm for drafting units
US3495391A (en) False-twist rubbing device
US5379488A (en) Sliver guiding arrangement for drafting units of spinning machines
US3028636A (en) Cradle for top rolls of double apron drafting arrangements
US2758340A (en) Drafting mechanism
US2694230A (en) Supporting and weighting device for the top rolls of textile drawing mechanisms
US3038213A (en) Drafting mechanism for textiles
US2677858A (en) Cradle for top aprons as used in high-draft systems
US3105998A (en) Raboisson
US2964806A (en) Wiper for top rolls of drafting arrangements
US2074556A (en) Drawing mechanism of spinning machines
US4391021A (en) Apron drafting system
US2941262A (en) Cradle for top rolls of double apron drafting arrangements
US3404434A (en) Fiber drafting system
US3050789A (en) Device for supporting and guiding belts of drafting assemblies
US3001241A (en) Drafting train on continuous spinning machines
US2735141A (en) Condenser supports
US2175107A (en) Mechanism for drawing textile rovings
JPH0649720A (ja) 少くとも１個のエプロンドラフトゾーンを具備したドラフト装置
US2182695A (en) Spinning frame
US2257045A (en) Spinning frame
US2703440A (en) Clearer for long-draft spinning aprons
US3126585A (en) Apron control means for drawing apparatus
US2943361A (en) Spinning frame apron guides
US3156953A (en) Textile drafting apparatus