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19. (WO2017134642) POSITIVE SHEDDING DEVICE WITH " SHAFT-IN-SHAFT" AND DISCS ARRANGEMENT
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TITLE OF INVENTION

POSITIVE SHEDDING DEVICE WITH " SHAFT-IN-SHAFT" AND DISCS ARRANGEMENT

The following specification particularly describes and ascertains the nature of this inventions and manner in which it is to be performed.

DESCRIPTION:

A. TECHNICAL FIELD OF INVENTION:

The invention relates textile engineering field and more specifically to the Shedding Apparatus used for warp thread patterning on Weaving Machines.

B. PRIOR ART:.

1. Indian Patents - No prior art with even the slightest resemblance in textile and weaving machine field.

2. Overseas Patents - No prior art with even the slightest resemblance in textile and weaving machine field.

It is known that almost all Dobby mechanisms in existence as on date are using either hook and knife or rotor-cam type arrangement which are confined in a smaller pitch (a small width in which whole mechanism has to be accommodated), which is equal to Heald frame pitch.

Thus it makes all the parts thin and complicated in order that they fit in to confined pitch. This makes such dobbies costlier to manufacture and maintain. All the parts for a given frame, must fit in to a pitch of say 12 to 15 mm which is the pitch of heald frames on majority of weaving machines today. As a result of this constrains, most of the shedding devices available today, the parts have to be manufactured from thin sheet metal. This makes parts very delicate and costly.

C. WHAT'S NOVEL IN THIS INVENTION:

If the parts are to be made stronger, simpler, cheaper and easy to manufacture & maintain, it was needed to break the barrier of pitch constraint on the physical nature of Shedding Apparatus parts. This novel Shedding Device uses unique shaft in shaft concept for driving the output levers of the shedding device. This enables freedom in selection and drive elements to remain at different pitch than the driving levers which isn't the case earlier on. Thus parts can be made simpler and stronger. Another novelty is that the selector mechanism and entire operations of frame selection and execution sequences are positive.

D. OBJECTIVES OF INVENTION :

1. Wherein, the main objective of the invention was to evolve world's first link and disc type positive shedding device without hook, knife and rotor cam type arrangement, the swivel links and discs augment the operational speed as well as overall reliability of the devise as a whole.

2. Wherein, the secondary objective of the invention was to have a shedding device in such a way that the output levers are driven by one of a kind "shaft in shaft" arrangement, gaining freedom for using bigger and better parts (the constraint in conventional devices comes from heald/shaft pitch limitation of 10 to 15 mm per frame.)

3. Wherein, the additional objective of the invention was to have a Shedding Device with positive electro-magnet actuated frame/shaft selector and frame execution mechanism.

4. Wherein, another additional objective of the invention was to have world's first left Hand Side and Right Hand Side, half split structure of shedding device occupying very little space on the weaving machine, augmenting making of a weaving machine with a very small footprint. Half the number of frames will be driven from one side and half from another.

E. BRIEF DESCRIPTION OF DRAWINGS:

The invention will now be described with the help of a drawing accompanying this specification wherein salient features have been shown by suitable numerals and referred to appropriately in the following description.

The Patent Illustration comprises total 12 diagrams:

Description of Diagram 1: Positive drive for shifting elements in shedding device -

Number 1 is gear drive running at half of beat up speed. Number 2 is pair of conjugated cams imparting desired oscillation motion to Cam rocker Numbered 3 which in turn drives Universal linkage lever numbered 4. Number 5 is universal connecting rod. This drives another universal lever numbered 6 which is mounted on shaft 7. Number 8 is linkage which imparts equal and opposite motion to shaft 9. Numbered 10 are levers fitted on shaft 7 and 9 which drive the other parts described in further diagrams in a positive way through connecting links numbered 11. Numbered 12 is selector mechanism on top of which the selector magnet numbered 13 is mounted. Numbered 14 is the lever driving motion to selector mechanism 12 which it gets from positive cam numbered 15 fitted on a shaft running at speed equal to beat up speed. This cam operates selector mechanism at timing between 5 to 25 degrees before and after the shedding timing or motion of the frames and not during the shedding movement. Numbered 16 is connecting rod for transferring motion from cam 14 at top to selector 12 at the bottom. Number 17 are output levers for shedding device which drive the heald frames. These levers are set at double the heald frame pitch. These levers drive only half the number of frames on the machine in an alternate manner, that is, even numbered frames are driven from one side and remaining odd numbered frames are driven from other end of the machine where an identical mechanism is provided. So to say the shedding device is split in to two halves and mounted on two sides of machine as illustrated in diagram 14.

Description of Diagram 2: Positive drive for shifting elements in shedding device (seen from another viewing angle) -

The description is identical to the description of diagram 1 as same numbers are given to the parts as they are the same but as seen from another viewing angle. Details on how the drive proceeds to the frames it is essential to describe "Shaft in shaft Concept" and then the further drive elements which fit over the Shaft in Shaft assembly can be better explained.

Description of Diagram 3: Shaft in Shaft Concept - Diagram 3 illustrated six stage basic Shaft in Shaft Concept as an example of application of this invention .

Numbered 18 is innermost shaft having overall diameter between 20 and 60 mm, which is longest in length and is supported by bearings mounted on two places 19 at the two ends of the shaft. Numbered 20 and 21 are input and output element keys located in keyways cut in shaft 18 for securing drive elements for farthest heald frame on the machine. In the illustration, in a six stage shaft in shaft this will drive heald number 11 or 12, based on whether his device is fitted on left or right split device on the machine. Over this shaft, is a hollow shaft numbered 22 slides over shaft 18 and serially there are 4 more sequentially bigger hollow shafts numbered 23,24,25 and 26 which form the whole six stage shaft in shaft structure. There can be as many stages as the weaving machine demands, present write up considers an exemplary 6 stage shaft in shaft arrangement.

All of these shafts numbered 22 to 26 (and so on as the case may be) have a radial thickness of between 4 to 20 mm. all shafts are free to rotate irrespective of others. Numbered 27 is step for locating pair of large bore thin bearing which fits in machine body. "Circlip" groove 28 restricts lateral movement of the shaft. Shaft 17 and 26 are the only laterally arrested shafts in the assembly. Rest of the shaft gain their position from the parts which fit over this assembly shown in further diagram no. 6. Numbered 29 and 30 are driving locks on both faces of all shafts 22 through 26, for elements which fit on both ends these shafts.

Working : Shaft in Shaft arrangement facilitates effectively breaks the pitch barrier for shedding device. On one side there is execution mechanism and another there are output levers. Output levers can be set at any pitch as they mean only one diametrical lock for levers. The execution mechanism however can be set at different pitch by extending length on other end of shaft in shaft arrangement. This is within itself a novel arrangement as none of the part are geometrically or structurally restricted as it will be revealed in further diagrams.

Description of Diagram 4: Assembly of discs over Shaft in Shaft arrangement -

Some numbers up to 26 are used as they are from prior diagrams described above as those are same parts. Further number 31, 33, 35, 37, 39, 41 and 43 are driving discs and having a have a notch on their circumference. These are freely oscillating without any diametrical locking arrangement with the shafts which they sit on. These are arranged in such a way they are alternately arranged with driven discs numbered 32, 34, 36, 38, 40 and 42. Out of the driver discs numbers 31, 35, 39 and 43 move in one direction whereas driver discs numbered 33, 37, and 41 move in opposite direction so that they create opposite motion pattern on both sides of each of the Driven discs grouped as 32 to 42 above. This motion pattern reverses on each and every weft pick on the machine. This is essential to have a choice to lower or raise the frame on each pick of weft inserted depending upon frames current position. Meaning when the heald is up is can be lowered on every next pick or if it is in up position it can be lowered on any next pick. Number 44 is selector latch which can be engaged for motion by selector mechanism. Number 45 is pivot point for latch 44 and numbered 46 are flat springs to center this lock and these are fitted on both sides of driven discs grouped 32 to 42 above. These locks are on all of the driven discs but only one of them is numbered here for simplicity of description.

Working : The selector latch 44 mounted in Driven Discs have opposite moving driver discs on both sides of it. Depending on signal for selector mechanism latch will be engaged with either of the driver discs effecting change in heald position as motion of driver disc is transferred to driven disc and then to the output levers through one of the shafts of shaft in shaft arrangement.

Description of Diagram 5: Positive locking arrangement for driven discs and shifter & retainer plates -

Diagram shows view of driven discs 32 to 42 only with locking shafts, all other parts are removed from diagram for simplicity. Number 47 is body of selector mechanism. Numbered 48 is face of selector mechanism body which arrests lock (inserted in driven discs & numbered 44 in diagram 3) in one direction. On the other end of the driven disc a projection 49 rests on shafts numbered 50, preventing the angular motion in other direction. This creates a unique position for driven disc so that it is positively locked between face 48 and shaft 50. Also shown in the same diagram are shifter plates 51 and 52 and retainer plate numbered 53, better explained in next diagrams.

Working : At the rest position or shed open position projection 49 rests on shaft 50 on back side of the driven disc. On the front side the selector latch 44 remains rested on surface 48 of the selector body 47. No motion is possible until the selector latch is moved. This is positive position lock for the frame.

Description of Diagram 6: Positive selector mechanism - drive for shifter plates -

Diagram shows view of Shifter mechanism, with the cover fastening holes Numbered 54. Number 55 are mounting holes for selector body on one side and numbered 56 are holes for mounting on other side. Numbered 57 and 58 are link driving parts secured together on a shaft forming a unified assembly of the same. Numbered 59 is part which fits right inside the body which is a slider driven by links 57 by means of one of the two small connecting links, creating oscillating motion of the same derived from cam and link arrangement 14, 15 and 16 described in diagrams 1 and 2 above. Number 60 is another slider which slides inside the body of slider 59 and gets opposite motion from remaining connecting small link of the duo described above and driven by part numbered 57. Numbered 61 is a pair of rectangular rods securely held in slots made in slider part numbered 59 and similarly, numbered 62 are another pair of rectangular rods secured securely held in slots made in slider part 60. These rods drive shifter plates 51 and 52 respectively (motion described below in paragraph). Plates 51, 52 and 53 are mounted on both sides of shifter body and plates on both sides are like mirror images of each other.

Working of Shifter plates 51 & 52 : Sliders 59 and 60 have rectangular rods 61 and 62 securely mounted respectively in them. These rods numbered 61 engage with shifter plates 52 on both sides and have a relief slots for both plates 53 and 51. Similarly Rods 62 engage with shifter plate 51 and has relief for motion of plates 53 and 52. At any given time shifter plates move opposite direction with each other whereas the retainer plate moves forward of back ward depending

upon drive from part 57. In case of frame shifting mode the shifter plates 51 and

52 move towards each other and retainer plate 53 moves backward. When the traverse of the frame is complete the shifter plates move backwards and retainer plate moves forward positively centering and securing the shifter latch 44 at positive lock position shown in diagram 5 above. Thus working of this mechanism is positive. Motion of these plates 53 will be explained in further with the help of diagrams 8.

Description of Diagram 7: Front view of selector fully assembled mechanism -

Diagram shows front view of selector mechanism fully assembled. 51, 52 and 53 are shifter and retainer plates briefly described in prior diagrams and explained in detail with next two diagrams 8 and 9. Numbered 63 is pair of selector levers used for sending a given the frame from up position to down position and numbered 64 is pair of selectors levers used to send same frame from down position to up position. Numbered 65 are retaining springs within the selector levers 63 and 64. Numbered 66 and 67 two geometrically surfaced slots to guide the shifter latch 44 through its up or down motion of respective driven disc. This working of frame selection is explained further diagram 10 before which diagram 8 and 9 must be understood.

Description of Diagram 8: Working of retaining plate numbered 53 -

Diagram shows translucent view of retaining plate 53 so that its working is understood. 47 is selector body in which slider part 59 moves in forward and backward oscillation ranging between 10 to 40 mm. Numbered 68 are two fixed pins in body of selector upon rectangular projections 69 so as to guide the retainer plate 53 in one direction and back guided in slots 71 in retainer plate. Numbered 70 are pins secured in slider 59 which lock in to oblique slots numbered 72 made in retainer plate so that pins numbered 70 create between 5 to 20 mm back and forth motion of retainer plate when slider 59 is moved by connecting links mounted on part numbered 57.

Working of Retainer plate 53: The retainer plate had three cam (oblique) slots numbered 72 in which pins 70 impart motion derived from part 59. These plates

53 being locked for linear motion by fixed pins the cam slot 70 drives the retainer forward or backward. There are projections on front face of retainer plates, these projections are made in such a way that the Selector latch 44 is pushed to center away from the reliefs which they fall in during shifting. Thus latch is firmly held at center after shifting is done, this is another positive action by this mechanism.

Description of Diagram 9: Working of frame selection / shifting of latch numbered 44:

_The diagram shows position of selector mechanism JUST at the start of shifting cycle. Numbered 73 and 74 are two sub parts of shifting lever numbered 64 or 65 or any selector lever on the selector body for that matter. These two Sub parts are pivoted together at pivot points 75 so that they can swing along with the shifter plate 51 when it moved forward. Numbered 76 are retaining springs in opposite direction on two adjacent levers. Number 77 are cylindrical appendages on the shifter levers.

Working: When the magnet activates a shifter lever, cylindrical appendage 77 falls between the shifter plate surface and the latch numbered 44 and when the shifter plate moves forward, the cylindrical appendage 77 shifts the latch 44 in one of the geometrical slots 66 and 67 in the body of selector (shown in Diagram 7), and simultaneously engages the latch in to slot numbered 78 in the driver disc adjacent to it. So the driven disc is free from positive lock position and engages itself with the driver disc and follows its motion up or down as the case may be. The magnets are released so shifter levers swing back to their home position. Upon completion of stroke with the driver disc, the latch returns to central position by means of two springs 45 (shown in diagram 5) and creates a positive lock position for the driven disc and the frame again.

Description of Diagram 10: Availability of shifting possibility on each and every pick:

Diagram 11 Shows a position of driver and driven discs at the time of shifting. Shaft 7 and 9 always move in opposite direction sync with each other. Driven discs 32, 36 and 40 are in down position and driven discs 34, 38 and 42 are in up position. First set of d riven discs have driven discs 32-36-40 have driver discs 33-37-41 to bring them up respectively. I n next pick the shafts 7 and 9 will oscillate to another position and driver discs sets 33-37-41 and 31-35-39-43 will interchange their positions. So on next pick driver 31-35-39 will be in a position to bring up the driven discs 32-36-40. So on every pick there are driver discs available for shift the given from its current position. Hence any heald frame can change its position after any pick inserted by the machine.

Description of Diagram 11 : Selector Mechanism Assembly module:

Diagram 12 shows entire selector mechanism assembly. Geometrical surfaces 66 and 67 guide the selector latch during frame shifting. The latch shifting is positive as explained above, frame locking is positive which is also explained above and remaining path is during changing position. These geometric surfaces positively guide the latch during the path hence positive handling conditions are maintained at all times. Despite this positivity of action the entire selector assembly can be taken out by dismantling just four fastners. This is the hardest working and delicate part of the entire Shedding device and it is thus arranged in a module form for segregation for maintenance.

Description of Diagram 12: Left and Right Split arrangement of Shedding device:

Diagrams 12 and 13 show the compact space saving feature of this Positive Shaft in shaft Shedding Device. Diagram 12 shows how it can be packed in a compact weaving machine body. Diagram 13 shows how left and right modules of the split shedding device are installed in a typical exemplary rapier weaving machine with 12 shafts warp designing capacity. Number 79 is left Shedding module fitted in left side machine body for driving heald frames l,3,5,7,9,and 11. Numbered 80 is right side Shedding module fitted in Right side body of machine driving heald frames 2,4,6,8,10 and 12. Numbered 81 are harnesses for frames. Number 82 are frames. This completes the Split Shedding mechanism arrangement wherein the output levers of each side units are at double the frame pitch which makes the output lever fitment simpler and easy to maintain .

From the description of diagrams and illustrative example of working clearly demonstrate that, all the main and supplementary objectives of this invention are thus achieved and this is a unique invention of its kind and achieved for the first time.

NOMENCLATURE:

Description of the invention refers to following items illustrated in diagrams 1 to 13.

Description of Diagram 1: Positive drive for shifting elements in shedding device

Number 1 is gear drive

Number 2 is pair of conjugated cams

Number 3 is cam rocker

Number 4 is universal linkage lever

Number 5 is universal connecting rod

Number 6 is another universal lever

Number 7 is shaft for driving discs

Number 8 is linkage

Number 9 is another shaft for driving discs

Number 10 are levers fitted on shafts 7 and 9

Number 11 are connecting links to the driver discs

Number 12 is selector mechanism

Number 13 is selector magnet

Number 14 is lever driving selector mechanism

Number 15 is positive cam for selector mechanism

Number 16 is connecting link from cam 15

Number 17 are output levers from shaft in shaft arrangement for heald frames

Description of Diagram 2: Positive drive for shifting elements in shedding device (seen from another viewing angle)

(All Repeated numerals from I to 17 should please referred above on description in diagram 1 )

Description of Diagram 3: Shaft in Shaft Concept

(Repeated numerals from 1 to 17 should please referred above on description in diagram 1)

Number 18 is innermost shaft

Number 19 are bearing mounting places

Number 20 and 21 are input and out element locking keys for inner shaft

Number 22 to 26 further hollow shafts

Number 27 step for locating bearings

Number 28 circlip groove for bearing locking

Number 29 & 30 Driving locks on both faces on all hollow shafts

Description of Diagram 4: Assembly of discs over Shaft in Shaft arrangement

(Repeated numerals from 1 to 17 should please referred above on description in diagram 1)

(Repeated numerals from 18 to 30 should please referred above on description in diagram 3)

Number 31,33,35, 37,39,41 and 43 are driver discs

Number 32, 34, 36, 38, 40 and 42 are driven discs

Number 44 is selector latch

Number 45 pivot point for latch 44

Number 46 are flat springs ( 4 springs per driven disc, 2 on each side)

Description of Diagram 5: Positive locking arrangement for driven discs and shifter & retainer plates - (Repeated numerals from 1 to 17 should please referred above on description in diagram 1)

(Repeated numerals from 18 to 30 should please referred above on description in diagram 3)

(Repeated numerals from 31 to 46 should please referred above on description in diagram 4) Number 47 is body of selector mechanism

Number 48 is critical face of selector mechanism body

Number 49 resting projection on driven discs

Number 50 pair of shafts preventing the driven disc angular motion

Number 51 and 52 are shifter plates

Number 53 retainer plates

Description of Diagram 6: Positive selector mechanism - drive for shifter plates

(Repeated numerals from 1 to 17 should please referred above on description in diagram 1)

(Repeated numerals from 18 to 30 should please referred above on description in diagram 3)

(Repeated numerals from 31 to 46 should please referred above on description in diagram 4)

(Repeated numerals from 47 to 53 should please referred above on description in diagram 5)

Number 54 are mountings holes for cover of shifter mechanism

Number 55 are mounting holes on one side of selector body

Number 56 are mounting holes on other side

Number 57 and 58 are parts for driving elements of selector mechanism

Number 59 is Slider part fitting inside Shifter mechanism body

Number 60 is another slider inside first one

Number 61 is pair of rectangular rods for driving shifter plates 51

Number 62 is another pair rectangular rods for driving shifter plates 52

Description of Diagram 7: Front view of selector fully assembled mechanism - (Repeated numerals from 1 to 17 should please referred above on description in diagram 1)

(Repeated numerals from 18 to 30 should please referred above on description in diagram 3)

(Repeated numerals from 31 to 46 should please referred above on description in diagram 4)

(Repeated numerals from 47 to 53 should please referred above on description in diagram 5)

(Repeated numerals from 54 to 62 should please referred above on description in diagram 6)

Number 63 and 64 are pair of selector levers

Number 65 are retaining springs mounted on Selector levers

Number 66 & 67 are geometrically surfaces slots for guiding latch 44

Description of Diagram 8: Working of retaining plate numbered 53 - (Repeated numerals from 1 to 17 should please referred above on description in diagram 1)

(Repeated numerals from 18 to 30 should please referred above on description in diagram 3)

(Repeated numerals from 31 to 46 should please referred above on description in diagram 4)

(Repeated numerals from 47 to 53 should please referred above on description in diagram 5)

(Repeated numerals from 54 to 62 should please referred above on description in diagram 6)

(Repeated numerals from 63 to 67 should please referred above on description in diagram 7)

Number 68 are fixed pins in selector body

Number 69 rectangular projection / slider for retaining plates

Number 70 are pins secured in slider 59

Number 71 is guiding slot cut in retainer plate 53

Number 72 is oblique or cam clot in retainer plate 53

Description of Diagram 9: Working of frame selection / shifting of latch numbered 44:

(Repeated numerals from 1 to 17 should please referred above on description in diagram 1)

(Repeated numerals from 18 to 30 should please referred above on description in diagram 3)

(Repeated numerals from 31 to 46 should please referred above on description in diagram 4)

(Repeated numerals from 47 to 53 should please referred above on description in diagram 5)

(Repeated numerals from 54 to 62 should please referred above on description in diagram 6)

(Repeated numerals from 63 to 67 should please referred above on description in diagram 7)

(Repeated numerals from 68 to 72 should please referred above on description in diagram 8)

Number 73 & 74 are two sub parts of shifting lever 64/65

Number 75 Pivot point for joining parts 73 and 74

Number 76 Retaining springs in opposite direction on two adjacent levers

Number 77 are cylindrical shifting appendages

Number 78 are slots ion driver discs

Description of Diagram 10: Availability of shifting possibility on each and every pick:

(Repeated numerals from 1 to 17 should please referred above on description in diagram 1)

(Repeated numerals from 18 to 30 should please referred above on description in diagram 3)

(Repeated numerals from 31 to 46 should please referred above on description in diagram 4)

(Repeated numerals from 47 to 53 should please referred above on description in diagram 5)

(Repeated numerals from 54 to 62 should please referred above on description in diagram 6)

(Repeated numerals from 63 to 67 should please referred above on description in diagram 7)

(Repeated numerals from 68 to 72 should please referred above on description in diagram 8)

Description of Diagram 11 : Selector Mechanism Assembly module:

(Repeated numerals from 1 to 17 should please referred above on description in diagram 1)

(Repeated numerals from 18 to 30 should please referred above on description in diagram 3)

(Repeated numerals from 31 to 46 should please referred above on description in diagram 4)

(Repeated numerals from 47 to 53 should please referred above on description in diagram 5)

(Repeated numerals from 54 to 62 should please referred above on description in diagram 6)

(Repeated numerals from 63 to 67 should please referred above on description in diagram 7)

(Repeated numerals from 68 to 72 should please referred above on description in diagram 8)

Number 79 are mounting places for magnet block

Description of diagram 12: Left and Right Split arrangement of Shedding device

Number 80 is left shedding module

Number 81 is right shedding module

Number 82 are harnesses for driving heald frames from left side module

Number 83 are harnesses for driving heald frames from right side module

Number 84 are frames through which threads are drawn for weaving