US3111144A - Method and apparatus for selectively presenting weft threads to weft thread inserting means in weaving machines - Google Patents

Description

Nov. 19, 1963 E. PFARRWALLER 3,111,144

METHOD AND APPARATUS FOR SELECTIVELY PRESENTING WEFT THREADS TO WEFT THREAD INSERTING MEANS IN WEAVING MACHINES Filed April 21, 1961 4 Sheets-Sheet 1 T' EPW/N Prq Nov. 19, 1963 E. PFARRWALLER 3,111,144

METHOD AND APPARATUS FOR SELECTIVELY PRESENTING WEFT THREADS TO WEFT THREAD INSERTING MEANS IN WEAVING MACHINES Filed April 21, 1961 4 Sheets-Sheet 2 Jnvenfor:

Nov. 19, 1963 E. PFARRWALLER 3,

METHOD AND APPARATUS FOR SELECTIVELY PRESENTING WEFT THREADS TO WEFT THREAD INSERTING MEANS IN WEAVING MACHINES Filed April 21, 1961 v 4 Sheets-Sheet 3 Fly. 6

5 Fig.7

Jnvenfar:

1963 E. PFARRWALLER 3,111,144

METHOD AND APPARATUS FOR SELECTIVELY PRESENTING WEFT THREADS TO WEFT THREAD INSERTING MEANS IN WEAVING MACHINES File d April 21, 1961 4 Sheets-Sheet 4 122112 g 12g; 1 56 12 0 12 4 I 123 124 155 1400' 0 Q; 140: 135 m $3? 134 1421/ 7 125 1421,- .2 12g 53 -?T W I 133 a b c a 54 k 138 a c b (1}) Jnvenfor:

United States Patent @hice 1 3 ,111,144 Patented Nov. 19, less 3,111,144 METHOD AND APPARATUS FOR SELEC- TIVIELY PRESENTHNG WEFT THREADS TB WEFI THREAD INSERHNG MEANS IN WEAVING MAQHlNES Erwin Piarrwaller, Winterthur, Switzerland, assignor to Snlzer Fret-es, .A., Winterthur, Switzerland, a corporation of witzerlantl Filed Apr. 21, 1961, Ser. No. 164,672 priority, application Switzerland Apr. 26, 196d 27 Claims. ((31. 139-126) The present invention relates to a method and apparatus for setting, in a loom for weaving, a thread changing mechanism for selectively presenting weft threads to means for inserting the selected weft threads into a shed formed by warp threads, the mechanism including locking means operated by the main drive shaft of the weaving machine for locking the mechanism in the position for presenting a selected weft thread and for releasing the mechanism after the selected weft thread has been taken over by the inserting means, for resetting the mechanism in the position for presenting the subsequently to be inserted weft thread.

in the method and apparatus according to the invention the setting of the mechanism is effected by one or more elements actuated by a shedding mechanism, the number of elements depending on the number of different Weft threads which must be selectively insented. The setting operation is accelerated by accumulating the force provided by the shedding mechanism during the periods when the thread changing mechanism is locked and by using the accumulated power for performing the opera tion of resetting the thread changing mechanism. In this way not only a greater force is available for the resetting operation but less force is more steadily drawn from the shedding mechanism and the latter and its drive are more equally and continuously stressed and loaded.

in the apparatus according to the invention a force accumulator is interposed between each element actuated by a shedding mechanism and the thread changing mechanism tor the above described purpose. This force accumulator may be a mechanical device using a coil spring as a force accumulator which spring is interposed between spring washers which are axially movable on a rod or pin between abutments thereon. The pin, spring and washer assembly is coaxially placed in an oblong cylinder whose end walls form abutments for the spring washers. In a modification, the force accumulator is constituted by a fluid under pressure acting between two pistons which replace the spring washers in a device which is otherwise similar to the aforedescribcd mechanical accumulator. in yet another modification the power accumulator is substituted by axially aligned coils producing, if energized by electric current, a magnetic force adapted to pull an armature mounted on a rod coaxial of and within the coils into a desired position depending on which coil is energized. The rod is connected to the thread changing mechanism and the selective energization of the coils is effected by switches actuated by the elements which are operated by the shedding mechanism.

if a mechanical or hydraulic force accumulator is used, a motion damping means is preferably interposed or connected to the linkage between the power accumulator and the thread changing mechanism.

The novel features which are considered characteristic of the invention are set forth with particularity in the appended claims. The invention itself, however, and additional objects and advantages thereof will best be understood from the following description of embodi- Claims merits thereof when read in connect-ion with the accompanying drawing, wherein:

F-QG. 1 is a perspective diagrammatic illustration of an apparatus according to the invention.

FIG. 2 diagrammatically illustrates four different operating positions of a mechanism actuated by the apparatus according to the invention for presenting selected weft threads to weft thread inserting means.

FIG. 3 is a graph showing the action and movements of individual parts of the apparatus according to the invention at different angular positions of the main drive shaft of the weaving machine.

FIGS. 4 to 7 are longitudinal sectional views of a mechanical force accumulator forming part of the apparatus according to the invention, in tour different operating positions.

FIG. 8 is a sectional view of a modified motion damping device for use in combination with the apparatus shown in FIG. 1.

PEG. 9 is a longitudinal sectional view of a portion of the device shown in FIG. 8.

FIG. 10 illustrates a modified portion of the apparatus shown in FIG. 1 including a hydraulic force-accumulating device which is shown in longitudinal section.

FIG. 11 is a part sectional view of a modified apparatus according to the invention including a magnetic device which is used in lieu of the vforce accumulator forming part of the apparatus shown in FIG. 1.

FIG. 12 is a longitudinal sectional view of a portion of a modified mechanical force accumulator suitable for use in the apparatus according to the invention.

HS. 13 is a cross-sectional view of the force accumulator shown in FIG. 12, the section being made along line XlIL-XIII of FIG. 12.

FIG. 14 is a longitudinal sectional view of a portion of a modification of a force accumulator suitable for use in the apparatus according to the invention.

FIG. 15 is a crosssectional view of the force accumulator shown in FIG. 14, the section being made along line XV-XV of FIG. 14.

Referring more particularly to FIG. 1 of the drawing, numeral 15 designates a dobby which may be connected to the frame of a weaving machine, not shown. The dobby includes a conventional mechanism for selectively actuating elements 16 individually operating .a mechanism for lifting a heddle frame .17. The dobby also actuates elements and 19 which are similar to the elements 16 and which operate a thread changing device 21 for selectively presenting weft threads to shuttles 59 which pick the weft threads in the conventional manner through a shed formed by warp threads.

The elements 18 and 19 are pivotally connected to an arm of angle levers 22 and 23, respectively, which swing on a stationary shaft 24 The second arms of the levers 22 and 23 are pivotally connected to one end of rods 26, 27, respectively, whose second ends are pivotally connected to one arm of angle levers 28 and 2.9, respectively, swinging on stationary pins 25. The second arms of the levers 2d and 2 9 are connected to force accumulators 30 and 31, respectively, which will be described later.

Pins 32 and 33 extend from the accumulators 3t) and 311, respectively, and are pivoted to the upper arms of three- arm levers 36 and 37, respectively, swingably supported by pins 34. Pins 5% and 41 are connected to arms 38 and 39 of the levers 36 and 37, respectively, and to the ends 42 and 43, respectively, of a balance beam 35. The fulcrum 44 of the latter is connected by a link 45 to a crank 46 connected to a shaft 47 supported by a stationary bearing and rigidly connected to the device 2 1. The latter has a circular marginal portion provided with axial grooves 48a to 48d axially slidably supporting thread presenters 49a to 49d, respectively. These thread presenters are pushed in the conventional manner towards the shuttles whenever a thread presenter is placed in the picking line. Such mechanisms are disclosed in Patent Nos. 2,726,685, 2,783,778, 2,796,084, 2,806,687, 2,817,367, 2,865,406.

The device 2 1 includes *a locking segment 51 having recesses 52a. to 520. for individually receiving a locking roller 53 at one end of a two-arm lever 54 swinging on a shaft 55. .The second end of the lever 54 is pivotally connected to one end of a rod 56, a pin '57 being connected to the second end of the rod 56 which pin extends into a cam groove 58 in a disc 5-9 mounted on a shaft 61 which is driven synchronously with the main shaft of the weaving machine, not shown, and makes one revolution per pick.

The arms 76 and 77 of the levers 36 and 37, respectively, are connected to damping pistons 78 and 79, respectively, which do not only dampen the rocking movement of the levers 36, 37 but are also adapted to stop movement of the device 21 when it is in a selected position for receiving the locking roller 53 in one of the recesses or notches 52.

Each of the levers 36 and 37 can assume two different positions so that the beam 65 can be placed into four different positions, as shown in FIG. 2.

Since the arm of the beam 35 extending from the fulcrurn 44 to the end 43 is twice as long as the arm of the beam extending from the fulcrum 44- to the end 42, the fulcrum 44 of the lever or beam 35 can be placed into two spaced positions b and c by placing the beam into inclined positions 35b and 350 and can also be placed into two positions a and d upon placement of the beam into an upper or lower horizontal position whereby the distances ab and c-d are equal to the distance bc. Fig. 2 separately shows the device 21 in the four positions obtainable by placing the fulcrum 44 into the four positions a, b, c and d.

FIG. 4 shows the force accumulator 31 which has a casing 65 one end of which is provided with an eye 64- receiving a pin for pivotally connecting the casing to the lever 29. The casing 65 accommodates a pressure spring 67 between washens 68 and 69 through which extends the pin 33 the end 71 of which is pivotally connected to the lever 37. The washer 68 is adapted to abut against a shoulder 73 of the pin 36 and the washer 6-9 is adapted to abut against a shoulder 72 of the pin 33. Depending upon the relative position of the pin 33 and of the casing 65 the washers may also abut the inner end walls of the casing 65. Each washer is made in two halves afiordin-g mounting on the thin middle portion of the pin 33. The spring 67 tends to move the washers apart. The length of the relatively thin portion of the pin 33 between the shoulders 72 and 73 is equal to the length of the interior of the casing 65.

When the drive shaft of the loom is in the angular position a" (FIG. 3), movement of the heddle frames by the shedding mechanism 15 is initiated. Line A represents the movement of the elements 16, 18 and 19 and of the eye 64 upon rotation of the main drive shaft of the weaving machine. Line B represents the movement of the eye 71 at the end of the pin 33. This eye 71 does not move when movement of the heddle frames begins because the device 21, whose movement is represented by line C, is locked at this time. At the angular position b the eye 64 has moved through the distance s (line A) and the washers 68, 69 rest on the shoulders 73 and 72 as well as on the end walls of the interior of the casing 65. There is no stress on the pin 33. The tension of the spring 67 is shown by line D of FIG. 3. The spring has an initial tension P When the main drive shaft has reached the angular position the eye 64 has moved through the distance S The washer 68 abuts the casing 65 and the washer 69 rests on the shoulder 72. In this position of the device 31 the spring 67 exerts a pressure F on the pin 33 which is equal to the sum of the initial tension P and the pressure produced by the movement of the eye 64.

The eye 64 is moved farther so that the spring 67 is additionally compressed. This shown in FIG. 5. When the main drive shaft has reached the angular position d the lever 54 begins to swing and unlocks the device 21 (line C). Unlocking is completed at position 2". The bolt 33 and the eye 71 can now move according to line B and the acctunulated force P can act on and move the lever 37 in clockwise direction, causing a lifting of the pin 41 and of the end 43 of the beam 35.

The aforesaid movement effects rocking of the device 21 to present a selected weft thread to a shuttle. The accumulated force P accelerates all elements needed for this operation.

Upon reaching the angular position 1 (line B) the damping apparatus begins to function. As seen in FIG. 1 the arm 77 of the lever 37 is connected to the piston 79 reciprocable in a cylinder containing oil in a casing 81. The cylinder communicates with a channel 83 by way of an aperture 82 in the middle of the cylinder and an aperture at the lower end of the cylinder. When the piston closes the aperture 82 oil fiow is throttled and the movement of the parts connected to the piston is braked until the piston reaches the bottom of the casing 81. In this position the initial tension P of the spring 67 acts on the pin 33, i.e. the washer 68 does not abut against the casing 65. The notch 52c is now opposite the roller 53 and the latter can be moved into the notch upon swinging of the lever 54 at the angular position g (line C) so that the device 21 is locked.

If, simultaneously with the actuation of the accumulator 3 1, the accumulator 30 is also actuated, the lever 36 is moved so that the device 21 is rocked from position d to position a (FIG. 2).

FIG. 6 shows the position of parts 64 to 71 of the accumulator 31 after unlocking, rocking and relocking of the device 21. Since the displacement x of the eye '71 71 is smaller than the displacement y of the eye 64, a force P is exerted on the lever 37 which force equals the initial tension P plus the force produced by the compression of the spring 67.

If the heddle frames move upwards according to line A, the eye 71 is, at first retained in the position shown in FIG. 7. The eye 64 moves upwards with the casing 65 to the position shown in FIG. 7 and to the left, as seen in FIG. 1. The pin 33 is pulled out of the casing 65 and the washer 69 rests on the :casing 65, the washer 68 rests on the shoulder 73 and the spring 67 is compressed. The pin 33 moves upward from the position shown in FIG. 7 upon unlocking of the device 211 and the pin 33 and the parts 64 to 71 assume the positions shown in FIG. 4. Due to the difference between the paths x and y the force P is applied to the pin 33.

FIG. 8 shows a modified damping device for damping the movement of the lever 36 swingable on the fulcrum The two arms 38 and 76 of the lever 36 are adapted to individually actuate a single-acting damping piston 84, $5, in cylinders 86, 87, respectively, in a casing 88. The pistons are pressed by springs 8% against adjusting screws 96 in the arms 38 and 76. The casing 88 has a cavity 91 filled with oil and laterally connected by bores 92 with the cylinders 66 and 87. The bottoms of the cylinders 86 and 87 are provided with oil outlets 93 which are interconnected by a channel 94. Throttle valves 95 are provided at the junction of the bores 93 and the channel 94.

The free ends of the piston 84 and are provided with pins 97 having a tapered end portion 96, as seen in FIG. 9, for throttling the passage of oil through the bores 93. The pins 97 are completely inserted in the outlet bores 93 when the lower ends of the pistons abut against the end walls 98 of the cylinders. The lever 37 may be pro' vided with two single-acting damping pistons in the same manner as is the lever '36 shown in FIG. 8.

If the lever 36 swings counterclockwise, the arm 38 to which the pin 40 is connected is lifted and lifts the arm 42 of the lever or balance beam 35. The arm 76 of the lever 36 pushes the damping piston 85 into the cylinder 87 against the action of the spring 89, driving the oil through the bore 92 into the cavity 91. After closing of the bore 92 by the piston 85 the oil moves through the channel 94 containing the throttle valves 95 into the space of the cylinder ss below the piston 84. At the begitming of the counterclockwise movement of the lever 36 the piston 84 follows the arm 33 due to the action of the spring 89. It may be possible that the upward movement of the piston 84 is not as fast as the upward movement of the screw 9% in the arm 38. This does not impair proper operation. The channel 94- is connected by a bore with the cavity 91 which bore may be closed by a plug 99 which may be so shaped as to act as a throttle in the channel 94. In this case the throttle valves 95 may be omitted.

FIG. illustrates a hydraulic force accumulator comprising a cylinder 1111 containing two pistons 1G2 and 163 which are axially movable on a pin 11M. Sealing rings are provided inside and outside of each piston for sealing the pistons against the pin 104 as well as against the inside of the cylinder 1131. The space 1115 between the pistons is filled with a fluid, for example, oil. A pressure chamber 107 is laterally connected to the cylinder 101 by means of a channel 166. The space 1118 in the pressure chamber 187 not filled by oil is occupied by air or gas under pressure.

The pin 104 is guided to move axially of the cylinder 101 by suitable guides at the ends of the cylinder 161. The pin is provided with annular shoulders 16? and 11th. The axial distance between these shoulders is equal to the distance between the end walls of the cylinder 101. The shoulders 1119 and 11h serve as abutments for the pistons 1G3 and 1112, respectively. To pennit removal of the pistons from the pin 1tl4 the shoulder 1111 is formed by a sleeve which is screwed onto the free end of the pin 1114. The sleeve extends into an axial guide extension of the cylinder 161 to which the lever 28 is pivotally connected. The end of the pin 194 projecting from the right end wall of the cylinder 1111, as seen in FIG. 10 is pivoted to a lever 112 which is rigidly connected to a shaft 113 corresponding to the shaft 47 in FIG. 1 and supporting the weft thread presenting device 114 corresponding to the device 2 1 in FIG. 1. The element 114 is provided with two recesses 115a and 1155 for slidably supporting weft thread presenters, not shown.

With the device shown in FIG. 10 only two different weft threads can be inserted and only two locking notches 11: and 117 we provided. The lever 112 has an arm 113 whose end is pointed and is received in a notch on a damping piston 119. The piston 119 is reciprocable in a cylinder formed in a casing 121 provided with a channel 122 communicating with the cylinder through an aperture 124 and at the end walls 121} of the cylinder, :1 throttle device 123 being placed in the channel approximately halfway between the ends of the cylinder.

The pistons 102 and 1113 abut either against the annular shoulders 11% and 109, respectively, on the pin 1194 and/or against the end walls of the cylinder 1111. if a piston is removed from an end wall of the cylinder 101, a force acts on the pin 104 which is equal to the end surface of the piston times the specific pressure acting in the chamber 108.

Since the weft thread changing device 114- has only two positions, only one force-accumulating device is required.

The devices 311 and 31 of FIG. 1 may be in the electromagnetic apparatus 125 provided with four coils 126a to 126d, as shown in FIG. 11. The coils are individually interposed in parallel relation between a line 127 and terminals 1280. to 12hr! of a double-throw switch 129 6 whose second terminals 130a to 13th! are connected in parallel to a line 131.

Switch elements 132 and 133 are individually operatively connected to the elements 18 and 19 shown in FIG. 1, the elements 132 and 133 replacing the casings 65 of the accumulators shown in FIGS. 1 and 4 to 7. The coils 126:: to 126d are placed coaxially and have a common armature 134 mounted on a rod 135 which is guided to move axially within the coils. One end of the rod 135 is pivotally connected to the free end of a lever 136. The latter is rigidly connected to a shaft 137 which carries a locking segment 139 and actuates a thread-changing device 138. The latter is provided with axial grooves 140a to 140d for axially guiding thread presenters, not shown. The thread-changing device is shown in the position for presenting a thread carried by the thread presenter which is in the groove 140b, numeral 141 desighating the picking line. The locking segment 139 is provided with recesses 142a to 142d for receiving a locking roller 143 mounted at the end of a lever 54 in the manner shown in FIG. 1.

In the position of the switch elements 132 and 133 shown in FIG. 11 the coil 12612 is energized and the armature 134 has moved into this coil so that the groove 1411b of the device 138 is adjacent to the picking line 1411.

Upon movement of the element 132 to the right the coil 12612 is deenergized and the coil 126a. is energized, tending to pull the armature 134 to the right. No actual movement of the armature and of the rod 135, however, can take place because the roller 53 is still in the recess 14212. When the roller 53 has been moved out of the recess 142]) by counterclockwise rocking of the lever 54- the thread-changing device 138 is free to be rocked and the armature 134 can move into the coil 126d, whereby the thread-changing device 138 is moved clockwise until the groove 140d is adjacent to the picking line 141.

If the switch element 133 is moved to the left and the element 132 is in the position shown in FIG. 11, the coil 126a is energized. If both switch elements 132 and 133 are moved from the positions shown in FIG. 11 to the second position, the coil 1245c is energized. The electromagnetic thread-changin'g setting apparatus shown in FIG. 11 and comprising the four coils 126a to 126d does not require special damping means and abutments for damping and limiting the movement of the rod 135.

The devices 31 and 31 of FIG. 1 may be constructed as shown in part in FIGS. 12 and 13. The part not shown in FIGS. 12 and 13 is like the part shown. A bolt 145 is provided with collars 146 which form abutments for twopiece washers 147, 143 at the ends of a compression spring 67. The washers are longitudinally split into the parts 147 and 148, if desired, at a slant with respect to the longitudinal axis of the pin 145, and can be moved along the pin 145 between the collars 146. The inside end of the washers 14-7, 148 is conical and a ring 149 having a corresponding conical bore is slipped over this inside cnd portion. The small diameter of the conical bore of the ring 149 is greater than the diameters of the collars 146.

A second coil spring 151} is placed coaxially of and inside of the coil spring 68 between the rings 149. The inside ends of the washers 147, 148 preferably project beyond the ring 149.

In the modification of the mechanical force-accumulating device shown in part in FIGS. 14 and 15 the spring washers 151 are provided with radial slots 152 so that they can be moved from the side onto the pin 154 whereby the spring 67 is held in compressed position. The slots 152 maybe filled with filling pieces 153 to provide a complete annular surface abutting against the shoulders formed by the collars 146. The filling pieces .153 are made fast on the washers by means of a pin 154. The part of the device not shown in FIG. 14 is like the part shown.

While specific embodiments of the invention have been 7' shown and descnibed, it will be apparent to "hose skilled in the art that various changes, modifications, substitutions, additions and omissions may be made therein with out departing from the spirit and scope of the invention as set forth in the appended claims.

I claim:

1. A method for setting in a loom for weaving by means of a shedding apparatus a mechanism for selectively presenting weft threads to means for inserting the selected weft threads into a shed formed by warp threads, the mechanism including means for locking the mechanism when the mechanism is set for presenting a selected weft thread and for unlocking the mechanism after the weft thread has been taken over by the inserting means, the method including the steps of temporarily accumulating, while the mechanism is locked, the actuating force furnished by the shedding mechanism, and of allowing the accumulated force to set the mechanism for presenting the subsequent selected weft thread upon unlocking of the mechanism.

2. A method as defined in claim 1 including the step of retarding setting of the mechanism by the accumulated force upon approaching the new setting position.

3. A method as defined in claim 1, including the steps of combining two setting pulses provided by the shedding mechanism for producing a pulse for setting the mechanism for presenting selected Wef-t threads to the weft inserting means.

4. In a loom for weaving having a shedding apparatus, and a mechanism for selectively presenting weft threads to means for inserting the selected Weft threads into a shed formed by warp threads, said mechanism including means for locking said mechanism in the positions for presenting selected weft threads to the weft thread inserting means and for releasing said mechanism for affording setting of the mechanism to a position for presenting the subsequently to be inserted Weft thread to the inserting means: actuating means operatively interconnecting said shedding apparatus and said mechanism for actuating said mechanism by said shedding apparatus when said locking means is released, said actuating means including force accumulating means adapted to temporarily accumulate the force provided by said shedding apparatus while said locking means is in locking position and to actuate said mechanism by the accumulated force upon release of said locking means.

5. In a loom for weaving as defined in claim 4 and wherein said force accumulating means includes two oblong, coaxial members having coextensive portions and connected to longitudinally move relatively to each other, one of said members being operatively connected to said shedding apparatus, the other of said members being operatively connected to said mechanism, each of said members having two axially spaced abutments, two elements placed in spaced relation between said abutments and movably connected to said members for moving longitudinally of said members, and force-accumulating and releasing means interposed between said elements and adapted to urge said elements apart longitudinally of said members and against said abutments.

6. In a loom for weaving according to claim 5 and wherein the distance between the abutments of one member is equal to the distance between the abutments of the second member, and the operating stroke of the member connected to said shedding apparatus is greater than the operating stroke of the member connected to said mechanism to retain an initial force in said force-accumulating means at all operating positions.

7. In a loom for weaving as defined in claim 4 and wherein said force accumulating means includes an o'blong casing operatively connected to said shedding apparatus, a pin placed within and axially reciprocable longitudinally of said casing and having an end portion projecting from said casing and being operatively connected to said mechanism, said pin having two axially spaced abutments, two elements placed between said abutments and within said casing movable longitudinally of said pin and of said casing and adapted to individually abut said abutments and the inner end walls of said casing, and force-accumulating and releasing means interposed between said elements and adapted to urge said elements apart axially of said pin and against said abutments and the inner end walls of said casing.

8. In a doom for weaving as defined in claim 7 and wherein one of said abutments is removably connected to said pin for affording mounting and removal of said elements on and from said pin.

9. In a loom for weaving as defined in claim 7 and wherein said force accumulating and releasing means is formed by a coil spring placed coaxially of said pin, and said elements are in the form of washers.

10. in a loom for weaving according to claim 9 and wherein said Washers have radial siots for placing said washers on said pin.

'11. In a loom for weaving according to claim 10, filling members placed in said slots, and means for retaining said filling members in said slots.

12. In a loom for weaving as defined in claim 9 and wherein said washers are diametrically split.

13. In a loom for Weaving as defined in claim 9 and wherein said spring is initially compressed and in uncompressed state longer than the distance between said washers when said washers abut said abutments.

14. In a loom for weaving according to claim 9 and wherein said abutments on said pin are in the form of annular shoulders and said washers are split into two parts substantially longitudinally of said pin.

15. In a loom for weaving according to claim 14 and wherein each of said washers has a conical extension, a ring having :a conical bore being slipped over said extension to hold the two parts of the washer together.

16. In a loom for weaving according to claim 15, a second coil spring placed within the first coil spring and abutting against rings.

17. In a loom for weaving as defined in claim 7 and wherein the interior of said casing is cylindrical, said elements are in the form of pistons provided with sealing means slidingly engaging the inside of said casing and with sealing means slidingly engaging said pin, and said forceaccumulating and releasing means is formed by a pressurized fluid.

18. In a loom for weaving according to claim 17, an accumulator for the pressurized fluid connected to and communicating with the interior of said casing between said elements.

19. In a loom for weaving having a shedding apparatus, and a mechanism for selectively presenting weft threads to means for inserting the selected weft threads into a shed formed by warp threads, said mechanism including means for locking the mechanism in the positions for presenting selected weft threads to the weft thread inserting means and for releasing the mechanism for affording setting of the mechanism to a position for presenting the subsequent ly to be inserted weft thread to the inserting means: an adjusting apparatus for setting said mechanism in selected positions to present selected weft threads to said weft thread inserting means, said adjusting apparatus including two actuating members operatively connected to said shedding apparatus for individual actuation thereby, a balance beam, a fulcrum supporting said balance beam, and two arms extending from said fulcrum, first connecting means operatively connecting one of said arms with one of said actuating members, second connecting means operatively connecting the second arm with the second actuating member, means operatively interconnecting said fulcrum and said mechanism for placing the latter in selected positions for presenting selected weft threads to the weft thread inserting means according to the position of said fulcrum, and means interposed in each of said connecting means for temporarily accumulating 9 the force provided by said shedding apparatus while said locking means is in the locking position and providing the force for actuating said mechanism for setting the mechanism in a selected position upon release of said locking means.

20. In a loom for weaving as defined in claim 19, a motion-damping means connected to each of said connecting means between the respective force-accumulating means and the respective arm of said balance beam.

21. In a loom for weaving having a shedding apparatus, and a mechanism for selectively presenting Weft threads to means for inserting the selected Weft threads into a shed formed by Warp threads, said mechanism including means for locking said mechanism in the positions for presenting selected weft threads to the weft thread inserting means and for releasing said mechanism for affording setting of the mechanism to a position for presenting the subsequently to be inserted Weft thread to the inserting means: actuating means operatively interconnecting said shedding apparatus and said mechanism for actuating said mechanism by said shedding apparatus when said locking means is released, s aid actuating means including force accumulating means adapted to temporarily accumulate the force provided by said shedding apparatus While said locking means is in locking position and to actuate said mechanism by the accumulated force upon release of said locking means, and motion-damping means connected to said actuating means between said force-accumulating means and said mechanism, said damping means including stop means for stopping said actuating means in a position corresponding to a predetermined position of said mechanism.

22. In a loom 'for Weaving as defined in claim 21 and wherein said damping means includes a cylinder having an open end and an end wall, a piston reciprocable in said cylinder, one end of said piston extending through said open end, a fluid in said cylinder, and a throttled conduit connected to said end Wall and to an intermediate portion of said cylinder, said stop means being formed by said end Wall Whereagainst said piston abuts for stopping said actuating means.

23. In a loom for weaving according to claim 22, a pin extending from said piston towards said end wall, and an aperture in said end wall connected for fluid flow with said conduit and adapted to receive said pin for throttling the fluid flow.

24. In a loom for Weaving according to claim 23 and wherein said pin has a tapered end portion.

25. in a loom for Weaving having a shedding apparatus, and a mechanism for selectively presenting Weft threads to means for inserting the selected weft threads into a shed formed by Warp threads, said mechanism including cans for locking the mechanism in the position for presenting selected Weft threads to the weft thread inserting means and for releasing the mechanism for affording setting of the mechanism to a position for presenting the subsequently to be inserted weft thread to the inserting means: actuating means operatively interconnecting said shedding apparatus and said mechanism for actuating said mechanism by said shedding apparatus when said lockin" means is released, said actuating means including means adapted to temporarily accumulate the force provided by said shedding apparatus While said locking means is in locking position and to actuate said mechanism by the accumulated force upon release of said locking means, a lever connected to said actuating means between said force-accumulating means and said mechanism, said lever having two arms, a single-acting damping piston adapted to be abutted by each of said arms, and means for individually resiliently pressing said damping pistons against said arms.

26. in a loom for Weaving as defined in claim 25, a cylinder for each of said pistons, said cylinders having an open end through which the respective piston extends and a closed end, a conduit interconnecting said closed ends, a fluid in said cylinders and in said conduit, and throttle means interposed in said conduit for throttling the fiow of the fiuid between said cylinders.

27. In a loom for Weaving having a shedding apparatus, and a mechanism for selectively presenting weft threads to means for inserting the selected weft threads into a shed formed by Warp threads, said mechanism including means for locking the mechanism in the positions for presenting selected Weft threads to the weft thread inserting means and for releasing the mechanism for afi'ording setting of the mechanism to a position for presenting the subsequently to be inserted weft thread to the inserting means: actuating means operatively interconnecting said shedding apparatus and said mechanism for actuating said mechanism by said shedding apparatus when said locking means is released, said actuating means including a plurality of axially aligned electric wire coils, a rod supported for longitudinal movement and axially extending through said coils, said rod being operatively connected to said mechanism for actuating the latter, an armature mounted on said rod, and switch means operatively connected to said shedding mechanism for actuation thereby for energizing a selected one of said coils according to the position of said shedding apparatus for pulling said armature and said rod by electromagnetic force into positions corresponding to the selected positions of said mechanism.

References Cited in the file of this patent UNITED STATES PATENTS 2,160,338 Moessinger May 30, 1939 2,160,339 Moessinger May 30, 1939 2,783,778 Pfarrwaller Mar. 5, 1957

Claims (1)

1. A METHOD FOR SETTING IN A LOOM FOR WEAVING BY MEANS OF A SHEDDING APPARATUS A MECHANISM FOR SELECTIVELY PRESENTING WEFT THREADS TO MEANS FOR INSERTING THE SELECTED WEFT THREADS INTO A SHED FORMED BY WARP THREADS, THE MECHANISM INCLUDING MEANS FOR LOCKING THE MECHANISM WHEN THE MECHANISM IS SET FOR PRESENTING A SELECTED WEFT THREAD AND FOR UNLOCKING THE MECHANISM AFTER THE WEFT THREAD HAS BEEN TAKEN OVER BY THE INSERTING MEANS, THE METHOD INCLUDING THE STEPS OF TEMPORARILY ACCUMULATING, WHILE THE MECHANISM IS LOCKED, THE ACTUATING FORCE FURNISHED BY THE SHEDDING MECHANISM, AND OF ALLOWING THE ACCUMULATED FORCE TO SET THE MECHANISM FOR PRESENTING THE SUBSEQUENT SELECTED WEFT THREAD UPON UNLOCKING OF THE MECHANISM.

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