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Section 4.1 Negative Tappet Cam Shedding Motion

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Section 4.1 Negative Tappet Cam Shedding Motion Section 4.1 Negative Tappet Cam Shedding Motion 4.1.1 Levelling Operation............................................................ 4.1-3 [ 1 ] Preparatory Operation .............................................. 4.1-3 [ 2 ] Levelling Operation................................................... 4.1-4 [ 3 ] Levelling Tool Maintenance ...................................... 4.1-6 4.1.2 Shed Close Timing ............................................................ 4.1-7 [ 1 ] Shed Close Timing ................................................... 4.1-7 [ 2 ] Shed Size ................................................................. 4.1-7 4.1.3 Shed Size .......................................................................... 4.1-8 [ 1 ] Shed Size ................................................................. 4.1-8 [ 2 ] Cam Combination..................................................... 4.1-9 [ 3 ] Adjusting the Shed Size ........................................... 4.1-10 4.1.4 Springs and Related Sections ........................................... 4.1-11 [ 1 ] Rope Installation Position......................................... 4.1-11 [ 2 ] Springs ..................................................................... 4.1-11 4.1.5 Healed Frames .................................................................. 4.1-15 [ 1 ] Height of Heald Frames............................................ 4.1-15 4.1.6 Modifying the Fabric Texture.............................................. 4.1-17 [ 1 ] Removing and Installing the Negative Tappet Cam ... 4.1-17 [ 2 ] How to Assemble Negative Tappet Cams ................ 4.1-20 [ 3 ] Number of Tappet Cams Required for Fabric Textures ... 4.1-31 [ 4 ] Replacement Parts Required for Fabric Texture Change ............................................. 4.1-31 [ 5 ] Arrangement of Tappet Cams and No. of Gear Teeth ... 4.1-32 4.1.7 Replacement of Shedding-related Components................ 4.1-34 [ 1 ] Shedding Timing Belt ............................................... 4.1-34 [ 2 ] Replacing Lower and Side Shedding Ropes............ 4.1-36 [ 3 ] Cam Lever................................................................ 4.1-38 MARCH, 2010 Ver. 2.02 4.1 - 1 4. SHEDDING MOTION 4.1 Negative Tappet Cam Shedding Motion (1) Rotation transmitted from the main motor drives the driving pulley 1 at the right-hand side of the weaving machine. Mounted to the driving pulley 1 is timing belt 2 which drives tappet cams 4 via gear train 3. As a particular cam 4 rotates, cam lever 5 oscillates so as to drive heald frame 7 via ropes 6 which tie the cam lever 5 to heald frame 7. (2) Upper springs 8 give tension to jack lever 10, rope 6, and cam lever 5 so that cam follower 9 mounted on cam lever 5 is pressed against the surface of tappet cam 4. NEVER touch jack lever 1, rope 2, or other moving parts during operation, since they are vibrating at ultra-high speed even though they appear to be static. 4.1 - 2 4.1 Negative Tappet Cam Shedding Motion 4.1.1 Levelling Operation The levelling operation should be done when changing the number of heald frames, replacing tappet cams (Subsection 4.1.6 “Modifying the Fab- ric Texture”), or modifying the shed size (Subsec- tion 4.1.3 “Shed Size”, [ 3 ] in this chapter). This operation requires the manual hydraulic levelling tool (J8207-05011-00). [ 1 ] Preparatory Operation (1) Turn adjusting bolt 2 on top of shedding motion bracket 1 to make dimension “a” from face 1A of bracket 1 to the head of bolt 2 sat- isfy 18 mm on the front side, and 23 mm (or 28 mm when the filament cam and spun cam are used in combination) on the back side, on each of the LH and RH sides. (2) Make tool pin 4 (J8207-03010-00) ready for use, which is to be inserted between jack lever 3 and adjustment bolt 2. (3) Keep manual hydraulic levelling tool 5 (J8207-05011-00) ready beside the weaving machine. (4) Lock relief valve 5a of levelling tool 5. 4.1 - 3 4. SHEDDING MOTION [ 2 ] Levelling Operation (1) Set the crank angle to the shed close timing at which the heald frames become aligned. (Refer to Subsection 4.1.2 “Shed Close Tim- ing”.) (2) Loosen warp yarns. (3) Turn off the main switch. (4) Insert cylinder 5b of hydraulic levelling tool 5 into the upper section of tappet box 6 through the window provided in the right-hand frame of the weaving machine. (5) Fit the forked end of cylinder 5b over fixing pin 8 located on stay 7 inside the machine. (6) Place the other end of cylinder 5b on pin 9a provided on levelling lever 9. (7) Check that relief valve 5a of levelling tool 5 is locked. (8) Release handle lock 5c, then pump handle 5d. This activates cylinder 5b so as to turn cam lever 10 towards the cam via levelling lever 9. Jack lever 13 is turned downward via rope 11 and heald frame 12. (9) Insert tool pin 4 (J8207-03010-00) into the slot between adjust bolt 2 located at the upper part of shedding motion bracket 1 and jack lever 13. REFERENCE: Pump handle 5d until tool pin 4 is completely inserted into place. (10) Carefully unlock relief valve 5a of levelling tool 5 halfway. (11) Check that rope 11 is loose. (12) Perform the work in question such as tappet cam replacement. 4.1 - 4 4.1 Negative Tappet Cam Shedding Motion NOTE: At the time of levelling, turn the cam lever 14 15 down carefully so as not to bring connector lever bolt 14 into contact with tappet cam 15. Especially be careful for the front frame. Restoring operation NOTE: Prior to proceeding to the restoring opera- tion, make sure that the lower shedding ropes are fitted in the grooves of the guide rollers. Restoring operation with the lower shedding ropes slipped out of the grooves will break the nylon cover of those ropes, resulting in broken ropes. (13) Pump handle 5d and remove tool pin 4 inserted in step (9). (14) Carefully unlock relief valve 5a of levelling tool 5, then remove the tool 5 from the machine. NOTE: Do not unlock the valve 5a quickly; otherwise, the tappet cam may bump the cam follower, resulting in damage. (15) When levelling lever 9 returns to the original position completely, remove cylinder 5b. REFERENCE: Cylinder 5b will not be removed unless levelling lever 9 is placed in the original position. 4.1 - 5 4. SHEDDING MOTION [ 3 ] Levelling Tool Maintenance NOTE: Before starting to use the levelling tool, make sure that cylinder head 5e and cylinder 5b are not loosened. Use in the loosened state may result in damage. Retightening method (1) With levelling tool 5 in the independent state, lock relief valve 5a, move handle 5d up and down and pull cylinder 5b to the full stroke position. Cylinder 5b is locked and not rotated. (2) Retighten cylinder head 5e with a wrench. 5e 5b Inspection upon oil leakage detection (1) Make sure that joints (5f and 5g) are not loos- ened. If loosened, retighten 5g. 5f 5g (2) Make sure that no foreign matter is entrapped between joints 5f and 5g. If any, remove it. 4.1 - 6 4.1 Negative Tappet Cam Shedding Motion 4.1.2 Shed Close Timing [ 1 ] Shed Close Timing The shed close timing refers to the crank angle where the heald frames are aligned. The standard setting is 350°. The close timing may be changed slightly depend- ing on the weaving condition. It is also possible to change the shift angle for plain weaving fabric for which warp separation is poor. (The shift angle refers to the difference in close tim- ing between head frames 3 and 4 and heald frames 1 and 2. The standard shift angle is 20°.) The shed close timing may be advanced for fabric for which picking is hard. [ 2 ] Shed Size (1) Adjust the crank angle to the shed close tim- ing where the head frames are aligned. (2) Lock the emergency stop push-button switch. (3) Loosen all four bolts 3 that secure timing pul- ley 2. (4) Set hand-wheel 4 (J8201-02010-00). (5) Unlock the emergency stop push-button switch, and press the RELEASE BRAKE switch to release the main motor brake. 2 (6) Adjust the crank angle to the desired angle. REFERENCE: If timing pulley 2 is rotated with 1 3 crank angle shaft 1 at the time of crank angle adjustment, tap timing pulley 2 a few times with a plastic hammer. Also, it is recommended that you apply grease or other lubricant to the mounting portion of the timing pulley for smooth rotation. (7) Lock the emergency stop push-button switch. (8) Tighten fixing bolts 3. 4 (9) Rotate the angle in the forward and reverse directions by step (6) operation to check the crank angle where the heald frames are aligned. 4.1 - 7 4. SHEDDING MOTION 4.1.3 Shed Size [ 1 ] Shed Size (1) Shed angle a° and shed width H are deter- H: Shed width (mm) mines as shown in the table according to the a: Shed angle (°) cam lever connector position. H (2) The shed size for the same connector position will vary with the tappet cam for the spun yarn a (large shed size) and that for the filament yarn (small shed size). Both the tappet cams for the spun and filament yarns may be used, but use them in combination according to the shed angle. The portions enclosed by thick frames are the standard settings for shed angles of spun cams and filament cams. Shed Yarn shed angle a° by frame for each connector position Connector Cam type width position Frame 1 Frame 2 Frame 3 Frame 4 Frame 5 Frame 6 Frame 7 Frame 8 Frame 9 Frame 10 H (mm) 2254.923.7————————— 2156.424.4————————— 2058.025.222.5———————— 1959.626.023.2———————— 1861.1—23.8———————— 1762.6—24.522.1——————— 1664.1—25.122.7——————— 1565.7—25.823.3——————— 1467.2——23.9——————— 1368.7——24.522.3—————— Filament cam 1270.2——25.122.9—————— (small shed 1171.7——25.723.4—————— size) 1073.2———23.922.0—————
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