US3664110A - Sliding radially-clamping gripper - Google Patents

Sliding radially-clamping gripper Download PDF

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Publication number
US3664110A
US3664110A US129491A US3664110DA US3664110A US 3664110 A US3664110 A US 3664110A US 129491 A US129491 A US 129491A US 3664110D A US3664110D A US 3664110DA US 3664110 A US3664110 A US 3664110A
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US
United States
Prior art keywords
bevel
sides
terminal element
groove
gripper according
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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US129491A
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English (en)
Inventor
Herbert Stalder
Jean Pellaton
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Electrospin Corp
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Electrospin Corp
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Filing date
Publication date
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques

Definitions

  • the present invention concerns a radially clamping gripper for angularly locking therewith a filiform object, notably a textile thread, while still enabling this filiform object to slide axially.
  • the clamping force is very much dependent on the diameter of the thread (i.e., on its number); as a result, the tension exerted on the thread fluctuates constantly because of the inevitable presence of lumps in the thread;
  • the clamping force is dependent on the rotational speed of the gripper and on the output rate
  • the present invention provides a gripper which does away with the major part of these drawbacks and which is characterized in that it comprises a bevelled tubular terminal element which is formed, at least at its end, with an internal V- shaped groove delimited by two sides and which is bevel out along a ruled surface perpendicular to the bisecting plane of these two sides, and a blade which is disposed in this ruled surface and which is applied against the bevel by resilient means, so that the groove and the blade together define a pyramidal channel for receiving the filiform object and having two fixed walls constituted by said sides and a movable wall constituted by the blade, the cross-section of this channel having the shape of an isosceles triangle with a rectilinear base of which the area progressively decreases towards the end of the bevel until it reaches, at that end, a minimum value constituting the outlet of this channel.
  • FIG. I is a front view of the essential part of the gripper.
  • FIG. 2 is a plan view of the whole gripper, part of which has been cut off.
  • FIG. 3 is a longitudinal view along line Ill-III of FIG. 2.
  • FIG. 4 is a section along line IV-IV of FIG. 2.
  • FIGS. 5, 6 and 7 illustrate, in section, variants of the part of the gripper shown in FIG. 4.
  • FIGS. 8 and 9 illustrate, in longitudinal section, variants of another part of the gripper, visible in FIG. 3.
  • the gripper comprises a tubular terminal element 1 having a base 2 which is provided with a shoulder 3.
  • This tubular terminal element is pierced with a channel 4, whose internal cross-section is circular, as shown by the contour 5 visible in FIG. 1, and it is bevelled (i.e., cut obliquely in relation to its axis 6) along a plane 7.
  • the channel 4 is formed with a V-shaped groove 8 delimited by two planar sides 9 and 10, the bottom 11 of which (see FIG. 3) is, at least at the end 12 of the bevel, parallel to the axis 6 of channel 4.
  • the plane 13 bisecting the sides of this groove passes through the axis 6 of channel 4 and is moreover perpendicular to the plane 7 of the bevel.
  • the height of the sides 9 and of groove 8 progressively decreases as one approaches the end 12, but their summital thickness e, measured in plane 7, is kept constant by the fact that the terminal element is externally delimited by two planes 14 and 15 that are oblique in relation to the axis 6 and whose line of intersection is located in this bisecting plane; in other words, the terminal element is not only bevelled (by virtue of plane 7), but it is also tapered (by virtue of planes 14 and 15).
  • the base 2 is formed with a meridian slot 16 across which extends a pin 17.
  • a strip 18, of resilient material which has previously been folded into the Vshape visible in FIG. 3 so that this strip comprises a first limb 19, which lies in the plane 7 of the bevel, and a second limb 20, which cooperates with the internal surface 21 of a rotary casing 22 in which is inserted the terminal element 1.
  • the angle formed by the V- shaped fold at its apex 23 is so chosen that the internal surface 21 of the sleeve 22 exerts a resilient prestress over the entire strip 18, the effect of this prestress being that the limb 19 of strip 18 is applied with an elastic force against the bevelled part 7 of the terminal element 1. In this way, the two sides 9,
  • a pyramidal channel 24 (FIG. 4) having two planar fixed walls 9, 10 and a movable wall 19; the cross-section of this channel has the shape of an isosceles triangle whose area progressively decreases as one approaches the end 12 of the bevelled part.
  • the length of the limb 19 of the resilient strip 18 is such that it leaves free the extreme tip of this pyramidal channel, this extreme tip constituting the outlet 29 of the latter.
  • the rotary casing 22 is itself mounted at the end of a spindle 25 that is rotatably driven about an axis coinciding with the axis 6 of the channel 4 of the tubular terminal element 1.
  • the whole set-up is capped by a member 26 which is so shaped internally as to form an inlet funnel 27, the narrower portion 28 of which coincides with the inlet of the channel 4 of the terminal element 1.
  • This gripper operates as follows.
  • This gripper is more particularly intended to serve as a twisting member in a spinning machine carrying out an openend spinning method on textile fibers.
  • the filiform object consists, at the input, of a plurality of fibers 30 which are progressively packed in the pyramidal channel 24, and angularly immobilized in relation to the end 12 of the terminal member 1. Since the latter rotates about its axis 6, under the rotational action of the spindle 25, the plurality of fibers 30 that constitutes the gripped object leaves the terminal member 1 at the outlet 29 of the pyramidal channel 24, in the form of a twisted thread 31.
  • This gripper has various advantages, which are of particular interest in this special application constituted by the manufacture of a thread by open-end spinning:
  • the clamping force only varies slightly with the diameter of the thread, because the force exerted by the resilient tongue formed by the limb 19 of strip 18 depends only little on this diameter; as a result, the tension (pull) exerted on the thread is stable;
  • any lumps appearing in the bundle of fibers 30 can easily move past the end 12 of the terminal element, since the mass that these lumps are required to push aside in order to move past the outlet 29 is minimal such mass reducing itself to that of the end of the tongue 19; the forces of inertia which come into play on that occasion are thus practically negligible.
  • the clamping elements constituted by the tongue l9 and the sides 9, 10 of groove 8 exert no frictional force on one another when this tongue moves away upon a lump travelling past;
  • the terminal element is bevelled has a self-centering effect on the thread; any fiber tending to escape between the tongue 19 and the tops of the sides of groove 8 is subjected, because of the inclination of the plane 7, to a force tending to return it towards the bisecting plane 13 of this groove, i.e., towards the interior of the pyramidal channel 14.
  • the inclination of this plane 7 is however not immaterial and it should be determined empirically; thus, it has become apparent that with a groove 8 whose planar sides 9, 10 are inclined 60 in relation to one another (thus imparting to the pyramidal channel 24 a cross-section of equilateral triangular shape), an inclination of the order of 20 was favorable. If the inclination is too slight, the tension in the thread is insufficient', if it is too large, this tension is likely to fluctuate.
  • the sides 9 and 10 of the groove 8 can have various inclinations, which provide the cross-section of the pyramidal channel 24 with the shape of a more or less acute isosceles triangle; however, an inclination of 60 percent is particularly advantageous since this cross-section can then have the shape of an equilateral triangle, which shape has an intrinsically useful symmetry.
  • the sides of the groove 8 can be formed not by planes, but by curved surfaces.
  • FIG. 5 shows a case where these sides are convex surfaces 33 and 34, which are mutually symmetrical in relation to the bisecting plane 13.
  • FIG. 6 these sides are also symmetrical convex surfaces, but instead of meeting along the bottom of the groove, with their bisecting plane 13 acting as a common tangent plane (angle of intersection equal to zero), they each have a different tangent plane, i.e., planes 36 and 37, which planes are mutually symmetrical in relation to the bisecting plane 13 (plane of intersection C other than zero).
  • the sides of the groove 8 can also consist of concave curved surfaces 38, 39 (FIG.
  • the cross-section of the pyramidal channel 24 has the shape of an isosceles curvilinear triangle with a rectilinear base; this curvilinear triangle is concave when the sides consist of convex curved surfaces (FIGS. 5 and 6); it is convex when these sides consist of concave curved surfaces (FIG. 7).
  • the bevel can be cut along a curved surface, which can either have its concavity situated to the side of the groove 8, like the curved surface 40 in FIG. 8, or have its concavity situated to the side remote from this groove 8, like the curved surface 41 in FIG. 9.
  • the terminal element is convexly bevelled, and in the second it is concavely bevelled.
  • the bevel is out along a ruled surface whose generatrices are perpendicular to the bisecting plane 13 of the sides of groove 8.
  • the tongue constituting the movable wall of the pyramidal channel must be so shaped as to conform to the surface along which the bevel is cut, the angle B of this surface in relation to the axis of the channel 4 being generally of the order of 20 at the end 12 of the bevel. Further the length of this tongue must be such that an outlet 29 remains free at the end of the pyramidal channel.
  • a tubular terminal element having a circular channel and of subsequently machining therein a groove 8 it is also possible to start off with a tubular terminal element whose channel 4 has a cross-section that already is of the required shape, e.g., a cross-section of equilateral triangular shape, and to machine at its inlet a connection, for instance of conical shape, that links this triangular section with the circular section of the end 28 of funnel 27.
  • a sliding radially clamping gripper,-for angularly locking therewith a filiform object, notably a textile thread, while still enabling this filiform object to slide axially comprising a bevelled tubular terminal element including an internal V- shaped groove delimited by two sides and which is bevel cut along a ruled surface on said terminal element perpendicular to the bisecting plane of these two sides, and a blade which is disposed in this ruled surface and which is applied against the bevel by resilient means, the groove and the blade together defining a generally pyramidal channel for receiving the filiform object and having two fixed walls constituted by said sides and a movable wall constituted by the blade, the crosssection of this channel having the shape generally of an isosceles triangle with a rectilinear base of which the area progressively decreases towards the end of the bevel until it reaches, at that end, a minimum value constituting the outlet of this channel.
  • a gripper according to claim 1 wherein a casing is provided and inside which are mounted the terminal element and the blade, the blade consisting of a strip of resilient material which is folded into a V thereby defining first and second limbs and which is housed between the casing and the terminal element, retaining means to maintain the strip in a position such that the first limb rests on said bevel to constitute said tongue and the second limb bears against the internal wall of the casing.
  • said retaining means comprises a pin secured to said terminal element ahead of said bevel, said pin being parallel to the surface of the latter and at right angles to the axis of the terminal element, and said folded strip being slipped over this pin so that the apex of its V-shaped fold may straddle the pin.
  • a gripper according to claim 4 wherein said planar sides are inclined at 60 in relation to one another, so that said rectilinear isosceles triangle is equilateral.
  • a gripper according to claim 1 wherein the two sides of said groove are planar sides, so that the cross-section of said channel has the shape of a rectilinear isosceles triangle.
  • a gripper according to claim 1 wherein the two sides of said groove are mutually symmetrical convex sides, so that the cross-section of said passage has the shape of a concave curvilinear triangle with a rectilinear base.
  • a gripper according to claim 1 wherein the two sides of said groove are mutually symmetrical concave sides, so that the cross-section of said channel has the shape of a convex curvilinear triangle with a rectilinear base.
  • a gripper according to claim 1 wherein the ruled surface along which said bevel is cut is a plane.
  • a gripper according to claim 1 wherein the ruled surface along which said bevel is cut is a curved surface whose concavity is located to the side of said groove, so that said terminal element is convexly bevelled.
  • a gripper according to claim 1 wherein the ruled surface along which said bevel is cut is a curved surface whose concavity is located remote from said groove, so that said terminal element is concavely bevelled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Clamps And Clips (AREA)
  • Sewing Machines And Sewing (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US129491A 1970-04-03 1971-03-30 Sliding radially-clamping gripper Expired - Lifetime US3664110A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH494570A CH527295A (fr) 1970-04-03 1970-04-03 Pince glissante à serrage radial

Publications (1)

Publication Number Publication Date
US3664110A true US3664110A (en) 1972-05-23

Family

ID=4285257

Family Applications (1)

Application Number Title Priority Date Filing Date
US129491A Expired - Lifetime US3664110A (en) 1970-04-03 1971-03-30 Sliding radially-clamping gripper

Country Status (14)

Country Link
US (1) US3664110A (it)
JP (1) JPS5130616B1 (it)
BE (1) BE765215A (it)
CA (1) CA927225A (it)
CH (1) CH527295A (it)
DE (1) DE2115880C3 (it)
EG (1) EG10657A (it)
ES (1) ES194289Y (it)
FR (1) FR2085814B1 (it)
GB (1) GB1289270A (it)
IE (1) IE35030B1 (it)
NL (1) NL7104480A (it)
SE (1) SE376026B (it)
SU (1) SU513631A3 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4468922A (en) * 1983-08-29 1984-09-04 Battelle Development Corporation Apparatus for spinning textile fibers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3527043A (en) * 1968-01-05 1970-09-08 Chavanoz Moulinage Retorderie Means and process for producing a false twist by friction
US3583144A (en) * 1969-01-14 1971-06-08 Electrospin Corp False twister having radially clamping grips
US3583142A (en) * 1969-01-17 1971-06-08 Electrospin Corp Radially clamping grips
US3584453A (en) * 1969-01-16 1971-06-15 Electrospin Corp Radially clamping grips

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3527043A (en) * 1968-01-05 1970-09-08 Chavanoz Moulinage Retorderie Means and process for producing a false twist by friction
US3583144A (en) * 1969-01-14 1971-06-08 Electrospin Corp False twister having radially clamping grips
US3584453A (en) * 1969-01-16 1971-06-15 Electrospin Corp Radially clamping grips
US3583142A (en) * 1969-01-17 1971-06-08 Electrospin Corp Radially clamping grips

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4468922A (en) * 1983-08-29 1984-09-04 Battelle Development Corporation Apparatus for spinning textile fibers

Also Published As

Publication number Publication date
DE2115880B2 (de) 1974-05-16
IE35030B1 (en) 1975-10-29
DE2115880C3 (de) 1975-01-02
CA927225A (en) 1973-05-29
EG10657A (en) 1976-03-31
BE765215A (fr) 1971-10-04
JPS5130616B1 (it) 1976-09-02
SE376026B (it) 1975-05-05
SU513631A3 (ru) 1976-05-05
IE35030L (en) 1971-10-03
ES194289U (es) 1974-12-01
ES194289Y (es) 1975-03-16
NL7104480A (it) 1971-10-05
CH527295A (fr) 1972-08-31
GB1289270A (it) 1972-09-13
DE2115880A1 (de) 1971-10-14
FR2085814B1 (it) 1974-03-01
FR2085814A1 (it) 1971-12-31

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