EP0916757A2 - Device to adjust the articulated head of the control linkage for the heald frames of looms - Google Patents
Device to adjust the articulated head of the control linkage for the heald frames of looms Download PDFInfo
- Publication number
- EP0916757A2 EP0916757A2 EP98120891A EP98120891A EP0916757A2 EP 0916757 A2 EP0916757 A2 EP 0916757A2 EP 98120891 A EP98120891 A EP 98120891A EP 98120891 A EP98120891 A EP 98120891A EP 0916757 A2 EP0916757 A2 EP 0916757A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- drawer
- guide
- wedge
- elements
- articulated head
- 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.)
- Granted
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Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C1/00—Dobbies
- D03C1/14—Features common to dobbies of different types
- D03C1/144—Features common to dobbies of different types linking to the heald frame
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
Description
- The present invention concerns a device to adjust the articulated head of the control linkage for the heald frames of looms and, particularly, a device to adjust and lock the linkage head on the control lever of the weave machine.
- As known, in looms, the heald frames are controlled by the shedding weave machine through linkages, the articulated head of which is connected to a control rocking lever mounted directly on the weave machine.
- The articulated head allows to carry out a double adjustment: a first one along its own length, and a second one along the control lever. It is thus possible to shift the articulation point of the linkage head, thereby adjusting the stroke of the corresponding heald frame (by moving the head along the control lever), or the position of the dead points of said frame (by varying the length of the head in a longitudinal sense).
- There are already known to be various types of adjustable articulated heads, wherein the locking of the adjustment position is obtained by means of a single control member (as, for example, in CH-621159 and in EP-633335), or else by means of two control members acting independently on the two adjustments (as, for example, in EP-A-705926 in the name of the Applicant).
- In any case, the locking of the articulated head on the control lever, once the adjustment has been carried out, is substantially obtained thanks to the action of members positioned only on one side of said head, in respect of the control lever: in particular, for easiness of access, on the side opposite to that carrying the articulation hinge.
- Consequently, the locking of the articulated head on the control lever actively occurs only along one of the sides of said lever, while the other side thereof - opposite to the locking side - is simply forced to bear against a corresponding abutting surface by the indirect action of the locking members.
- Although the stress imparted on the articulated head by the control lever is mainly directed orthogonally to said lever, the type of locking adopted up to date - namely, only on one side of the lever - has, in many cases, proved to be insufficient.
- In fact, on increasing of the loom speed, and thus of the inertial forces involved, there is an increase in the stresses imparted on the head by the control lever; it thus becomes indispensable to provide for a more steady locking of the head onto the lever, failing which there could be slackenings and consequent malfunction, as well as wears due to sliding frictions. A single direct locking point allows the control lever to have an infinitesimal freedom of oscillation centered on the locked edge; with the recurrence of working cycles involving high stresses, this may lead to significant deformations, and thus to breakage, or at least to the start of troublesome vibrations.
- In other words, the lever side which simply bears against the corresponding abutting surface does not ensure a positive locking especially lengthwise to the coupling plane. It is hence necessary for the control lever to be firmly locked on both of its sides to the articulated head, so as to obtain a direct and positive locking thereof.
- The EP-744482 discloses an articulated head, which comprises two guide means apt to engage with corresponding wedge-shaped elements acting on the two opposite sides of the control lever. However, this solution is not fully satisfactory.
- In fact, the guide means are inevitably stout, so as to ensure the required structural resistance to the outward pressure force imparted thereon by the wedge-shaped elements. This involves considerable distributed masses, which create vibration problems tied to the oscillations proper to the system.
- Moreover, the positioning in succession - starting from the longitudinal axis of symmetry of the head and extending outwards - of a wedgeshaped element, of two further cooperating wedge-shaped elements, and of the guide means, leads to considerable transversal bulks.
- The object of the present invention is to thus supply an articulated adjustment head apt to solve the aforementioned drawbacks and, in particular, an articulated head apt to be adjusted and locked on both sides of the control lever, but simultaneously involving a light structure, a simple construction and small transversal dimensions.
- Said objects are reached with an articulated head of the control linkage for the heald frames of looms, operating on the control lever of a shedding machine to carry out the adjustment both of the heald frame stroke and of the starting position of said stroke, of the type comprising:
- a stiff long guide;
- a drawer longitudinally sliding therein with precision, a portion of the control lever crossing the guide and the drawer; and
- at least first and second positive locking means, positioned
opposite and acting on the two sides of said lever;
characterized in that, the first positive locking means comprise wedgeshaped elements apt to impart a direct pressure substantially transversal to the guide and towards its longitudinal axis, under the action of the adjacent side of said control lever pressed on said wedge-shaped elements by the action of the second positive locking means. - Fig. 1 is a diagrammatic view of the controls transmitted from a weave machine to a heald frame, showing the location of the adjustable linkage head;
- Fig. 2 is a part section view of an embodiment of the articulated head according to the invention;
- Fig. 3 is a cross-section view along the line III-III of fig. 2;
- Fig. 4 shows a detail, on an enlarged scale, of the central locking system according to the invention illustrated in fig. 2; and
- Fig. 5 is a part section view of another embodiment of the articulated head according to the invention.
- In loom operation - as shown in fig. 1 of the drawings - a shedding weave machine 1 causes a
control lever 2 to oscillate by a fixed angle β. Alinkage 3 transmits to theheald frame 4 the controls of thelever 2, to which there is fixedly connected an adjustable articulatedhead 5, hinged in 6 to the connecting rod 7 of thelinkage 3. - To be concise, reference is made to EP-A-705926 which already widely describes the fundamental elements forming the articulated
head 5, the reference numbers of the respective elements corresponding to those used herein. Summing up, the articulatedhead 5 comprises a stifflong guide 8 and adrawer 9 longitudinally sliding into saidguide 8. Thecontrol lever 2 is inserted across the guide 8and thedrawer 9. - In EP-A-705926, the
control lever 2 is positively locked merely in correspondence of its outward side S1, far from the articulation point or hinge 6 - by means of first wedge-shaped elements 19 - while its inward side S2, adjacent to thehinge 6, is simply forced to abut against the bottom of thedrawer 9 by the opposing action of the locking means 19. - According to the present invention, positive locking means - centrally positioned - are provided also in correspondence of the inward side S2 of the
control lever 2. For this purpose, the bottom of thedrawer 9 comprises ablock 100 with double chocks engaging with twohammer elements 101. Eachhammer element 101 has ahead 102 wider than the width of the slot 11 (fig. 3) formed into thedrawer 9, and a wedge-shaped shank 103, sufficiently thin to be housed in thedrawer 9 and cross thelongitudinal slots guide 8 and into thedrawer 9. - The
shanks 103 haveinner surfaces 103a, engaging with the inward side S2 of of thecontrol lever 2, andouter surfaces 103b, formed with an opposite inclination, like a wedge, and cooperating with thedoublechock block 100. The inclination of theouter surfaces 103b is such that a pressure imparted thereon by the ends of the double-chock block 100 causes the approach of the twohammer elements 101, which thus snap onto the lateral sides of theguide 8. - The two
shanks 103 are preferably connected together by anelastic member 104, such as a helical spring, which keeps them joined and thus inserted into thedrawer 9 also when no pressure is imparted by theblock 100, that is, in the absence of thecontrol lever 2, or when the locking has not yet been performed and thelever 2 is loose inside thedrawer 9. - When the articulated
head 5 needs to be adjusted and locked into a new position on thelever 2, it is first of all necessary to loosen the peripheral locking system, namely thelocking elements lever 2 and thehinge 6 by means of thescrew 23, and finally to again tighten thewedgeshaped locking elements - This last operation forces the
lever 2 to press, with its inward side S2, onto thehammer elements 101, which in turn press onto theblock 100 with double chocks, positioned onto the bottom of thedrawer 9. The reaction of theblock 100 onto thehammer elements 101, thanks to the wedgeshaped surfaces, is converted into a transversal pressure imparted on thehammer elements 101, in an inward direction, namely towards the longitudinal axis a-a' of the articulatedhead 5; this leads theheads 102 of thehammer elements 101 to forcedly bear against the lateral surfaces of theguide 8. - Preferably, the lateral surfaces of the
guide 8 haverims 105 bent at 90. towards the inside of thedrawer 9, said rims being apt to retain and precisely guide said drawer. When the twohammer elements 101 snap onto the lateral sides of theguide 8, under the reaction of theblock 100 determined by the pressure of thelever 2, theheads 102 of said hammer elements are forced to abut against the lateral surfaces of theguide 8 and, in particular, against therims 105, thereby ensuring a first retaining and locking effect. - Moreover, the pressure of the
heads 102 causes a local deformation of therims 105, which clamp the edges of thedrawer 9, thereby ensuring a further retaining action and locking of said drawer onto theguide 8, close to thehinge 6. - The excellent double locking action of the device of the invention, and its reduced transversal dimensions allowed by the two
hammer elements 101 projecting from theguide 8 merely with theheads 102, as well as its structural simplicity, allow to successfully reach the intended objects.
According to another embodiment, the peripheral positive locking system no longer has - as in EP-A-705926 -a double locking element, but merely comprises the first wedge-shaped elements 19 operated by thescrew 20. In fact, thesolid portion 12 of thedrawer 9 has aprotuberance 106 which engages with the wedge-shaped element 21 by way of asurface 21A inclined in respect of the longitudinal sliding axis of thedrawer 9. A further intermediate wedge-shaped element 107 is interposed between the first wedge-shaped elements 19, thesolid portion 12 and the second wedge-shaped element 21. - In this way, by simply tightening the
screw 20, one obtains a resetting of the wedge-shaped elements such that it simultaneously provides to lock thesolid portion 12 and the second wedge-shaped element 21 into theguide 8, and to lock thelever 2 between the first wedge-shaped elements 19 and thehammer elements 101. - An additional operating member, namely the
screw 22, has thus been advantageously eliminated, thereby making the construction of the articulatedhead 5 even simpler and lighter. - Also this second embodiment allows to obtain the positive locking of both sides S1 and S2 of the
control lever 2, by means of a device easy to operate, of reduced dimensions, light, and of simple construction. - It is anyhow understood that the invention is not limited to the particular embodiments described hereabove which merely form non-limiting examples of its scope, but that a number of variants can be introduced, all within reach of a person skilled in the art, without thereby departing from the protection field of the present invention.
Claims (9)
- Articulated head of the control linkage for the heald frames of looms, operating on the control lever of a shedding machine, to adjust both the stroke of the heald frame and the position of the dead points of said frame, of the type comprising:a stiff long guide (8);a drawer (9) longitudinally sliding therein with precision, a portion of the control lever (2) crossing the guide (8) and the drawer (9); andat least first and second positive locking means, positioned opposite and acting on the two sides (S1, S2) of said lever (2);
characterized in that, the first positive locking means comprise wedgeshaped elements (100, 101) apt to impart a direct pressure substantially transversal to the guide (8) and towards its longitudinal axis (a-a'), under the action of the adjacent side (S2) of said control lever (2) pressed on said wedge-shaped elements (100, 101) by the action of the second positive locking means. - Articulated head as in claim 1), wherein said first positive locking means are centrally positioned, between the articulation point (6) of the articulated head (5) and the control lever (2).
- Articulated head as in claim 1) or 2), wherein said first positive locking means consist of two hammer elements (101) which snap onto the lateral sides of said stiff long guide (8).
- Articulated head as in claim 3), wherein said hammer elements (101) engage, on one side, with the inward side S2) of the control lever (2) and, on the other side, with the bottom of said drawer (9), through a block (100) with double chocks engaging with corresponding inclined surfaces (103b) of the two hammer elements (101).
- Articulated head as in claim 4) wherein said hammer elements (101) have a head (102), which is wider than the width of slots (10, 11) formed into the lateral sides of said guide (8) and said drawer (9), and a shank (103), which is less thick than the width of said slots (10, 11) and onto which are formed said inclined surfaces (103b).
- Articulated head as in any one of claims 3) to 5), wherein said hammer elements (101) are connected together by an elastic member (104).
- Articulated head as in any one of the previous claims, wherein said guide (8) has, in correspondence of said slots (10, 11), deformable rims (105) bent towards the inside of the drawer (9), said rims (105) clamping the lateral sides of the drawer (9) under the pressure of the heads (102) of said hammer elements (101).
- Articulated head as in any one of the previous claims, wherein said second positive locking means comprise:a pair of first wedge-shaped locking elements (19), partially inserted into the slots (10, 11) of the guide (8) and of the drawer (9) and connected by screw means (20), said locking elements (19) acting between an adjacent side (S1) of the control lever (2) and a solid portion (12) of the drawer (9); andat least another wedge-shaped element (21), acting between the solid portion (12) of the drawer (9) and the guide (8), said element (21) being operated by a screw (22) connected to said solid portion and being apt to block said solid portion (12) of the drawer (9) into said guide (8).
- Articulated head as in any one of claims 1) to 7), wherein said second positive locking means comprise:a pair of first wedge-shaped locking elements (19), partially inserted into the slots (10, 11) of the guide (8) and of the drawer (9) and connected by screw means (20), said locking elements (19) acting between an adjacent side (S1) of the control lever (2) and a solid portion, (12) of the drawer (9);at least a second wedge-shaped element (21), acting between the solid portion (12) of the drawer (9) and the guide (8); andat least a third wedge-shaped element (107), acting between the solid portion (12) of the drawer (9), the second wedge-shaped element (21) and the pair of first wedge-shaped locking elements (19);said second element (21) and said third element (107) being apt to lock said solid portion (12) of the drawer (9) into said guide (8) through the mere action of said screw means (20).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT97MI002389A IT1295386B1 (en) | 1997-10-23 | 1997-10-23 | DEVICE FOR ADJUSTING THE HEAD OF THE CONTROL TIE-ROD OF LICCI PAINTINGS IN A TEXTILE FRAME |
ITMI972389 | 1997-10-23 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0916757A2 true EP0916757A2 (en) | 1999-05-19 |
EP0916757A3 EP0916757A3 (en) | 1999-07-07 |
EP0916757B1 EP0916757B1 (en) | 2003-11-12 |
Family
ID=11378092
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98120891A Expired - Lifetime EP0916757B1 (en) | 1997-10-23 | 1998-10-22 | Device to adjust the articulated head of the control linkage for the heald frames of looms |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0916757B1 (en) |
DE (1) | DE69819661T2 (en) |
IT (1) | IT1295386B1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006040474A1 (en) * | 2006-08-29 | 2008-03-20 | Schneider & Ozga | Broad loom accommodates one or more drive units connected through adjustable eccentric to heald-puller levers of associated heald frames in each section |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0252177A1 (en) * | 1986-07-09 | 1988-01-13 | Kaiser GmbH & Co. KG | Device to connect an oscillating lever of a dobby to a heddle frame of a loom |
EP0633335A1 (en) * | 1993-07-05 | 1995-01-11 | Stäubli AG (Stäubli SA) (Stäubli Ltd.) | Adjusting device in the connecting path between the rocking lever of a dobby and a heald frame of a loom |
EP0705926A1 (en) * | 1994-10-05 | 1996-04-10 | FIMTEXTILE S.p.A. | Head of the control linkage for the heald frames of looms to carry out independently the two adjustments in respect of the control lever of the shedding machine |
EP0744482A2 (en) * | 1995-05-24 | 1996-11-27 | Stäubli Faverges | Adjustable clip to connect the rocking levers of a dobby to the rods of the lifting system |
-
1997
- 1997-10-23 IT IT97MI002389A patent/IT1295386B1/en active IP Right Grant
-
1998
- 1998-10-22 EP EP98120891A patent/EP0916757B1/en not_active Expired - Lifetime
- 1998-10-22 DE DE69819661T patent/DE69819661T2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0252177A1 (en) * | 1986-07-09 | 1988-01-13 | Kaiser GmbH & Co. KG | Device to connect an oscillating lever of a dobby to a heddle frame of a loom |
EP0633335A1 (en) * | 1993-07-05 | 1995-01-11 | Stäubli AG (Stäubli SA) (Stäubli Ltd.) | Adjusting device in the connecting path between the rocking lever of a dobby and a heald frame of a loom |
EP0705926A1 (en) * | 1994-10-05 | 1996-04-10 | FIMTEXTILE S.p.A. | Head of the control linkage for the heald frames of looms to carry out independently the two adjustments in respect of the control lever of the shedding machine |
EP0744482A2 (en) * | 1995-05-24 | 1996-11-27 | Stäubli Faverges | Adjustable clip to connect the rocking levers of a dobby to the rods of the lifting system |
Also Published As
Publication number | Publication date |
---|---|
ITMI972389A1 (en) | 1999-04-23 |
EP0916757B1 (en) | 2003-11-12 |
IT1295386B1 (en) | 1999-05-12 |
DE69819661D1 (en) | 2003-12-18 |
DE69819661T2 (en) | 2004-10-14 |
EP0916757A3 (en) | 1999-07-07 |
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