CN210237969U

CN210237969U - Warp feeding device of warp knitting machine

Info

Publication number: CN210237969U
Application number: CN201920828090.1U
Authority: CN
Inventors: Xiaoming Zhu; 朱晓明
Original assignee: Haining Dongchang Knitting Chemical Co ltd
Current assignee: Haining Dongchang Knitting Chemical Co ltd
Priority date: 2019-06-03
Filing date: 2019-06-03
Publication date: 2020-04-03
Anticipated expiration: 2029-06-03

Abstract

The utility model discloses a warp let-off device of a warp knitting machine, which comprises a frame, wherein two brackets are arranged on the frame, each bracket comprises a cross rod, a fixed rod and an adjusting rod, the lower end of the fixed rod is fixedly connected with the side wall on one side of the cross rod, an adjusting port is arranged on the cross rod, an installation cavity is arranged in the adjusting port, a worm wheel is arranged in the installation cavity, a threaded hole is arranged at the circle center of the worm wheel, external threads are fixedly arranged on the side wall of the lower end of the adjusting rod, the lower end of the adjusting rod passes through the threaded hole, a worm is arranged in the cross rod, one end of the two cross rods is provided with a motor I, an output shaft of the motor I is fixedly connected with one end of the worm, the upper end of the fixed rod is provided with a pressure rod I, and the upper, the two compression bars can better realize the adjustment of the warp tension.

Description

Warp feeding device of warp knitting machine

Technical Field

The utility model relates to a weaving technical equipment field, in particular to let-off motion of tricot machine.

Background

Warp knitting machines are textile machines for producing warp knitted fabrics by means of a method in which one or several sets of parallel arranged yarns are unwound from a reel head onto working needles of a warp-stabilizing infeed machine to form loops. The warp knitting machine has wide adaptability to raw materials and fabric varieties and high machine productivity.

The warp knitting machine mainly comprises a knitting mechanism, a guide bar shogging mechanism, a warp feeding mechanism, a drawing and coiling mechanism and a transmission mechanism, wherein warp yarns are input by the warp feeding mechanism, a fabric is knitted by the mutual matching motion of all components in the knitting mechanism, meanwhile, a knitted fabric with a certain tissue structure is knitted by the guide bar shogging mechanism, and finally, the finished knitted fabric is drawn forwards by the drawing and coiling mechanism and coiled into a whole coil.

The warp feeding mechanism is one of the important devices of the warp knitting machine, and is divided into a passive structure and an active structure, so that the quality and the pattern variety of warp knitting products are directly influenced. If the warp feeding mechanism controls the warp feeding amount abnormally, yarn shaking and even breakage can be caused, and the production efficiency of the warp knitting machine and the quality of grey cloth are affected.

When a warp feeding device of a common warp knitting machine works, the warp feeding device cannot be well adjusted according to the elasticity of warp yarns, so that the warp knitting machine cannot work normally due to the fact that the warp yarns are broken due to the fact that the warp yarns are pulled too tightly when the warp yarns are conveyed. In view of the above problems, a solution is proposed as follows.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a let-off motion of tricot machine has the elasticity that can be according to the warp, uses two pressure bars to adjust the warp, makes the warp can be straightened, and can not tightly stretch, makes the warp can be better by the conveying, the advantage of the follow-up processing of being convenient for.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a warp let-off device of a warp knitting machine comprises a frame, wherein a warp let-off roller is arranged on one side of the frame, rotating rods are fixedly arranged at two ends of the warp let-off roller, the two rotating rods are respectively inserted on the side walls on two sides of the frame and are rotatably connected with the side walls of the frame, a yarn dividing plate is arranged on the frame, a plurality of yarn dividing holes are formed in the yarn dividing plate and are uniformly distributed along the length direction of the yarn dividing plate, two supports are arranged on the frame and have the same structure, the side walls of the two supports are respectively and fixedly connected with the side walls on two sides of the frame, each support comprises a cross rod, a fixed rod and a regulating rod, the lower end of the fixed rod is fixedly connected with the side wall on one side of the cross rod, an adjusting opening is formed in the cross rod, the lower end of the regulating rod penetrates through the adjusting opening and is slidably connected with the adjusting, the center of the worm wheel is provided with a threaded hole, the side wall of the lower end of the adjusting rod is fixedly provided with external threads, the lower end of the adjusting rod penetrates through the threaded hole and is matched with the threaded hole, a cavity is arranged in the cross rod, one side of the installation cavity is communicated with one side of the cavity, a worm is arranged in the cavity and is meshed with the worm wheel, one end of each of the two cross rods is provided with a first motor, the side wall of the first motor is fixedly connected with the side wall of the rack, the output shaft of the first motor penetrates through one end of the cross rod and is fixedly connected with one end of the worm, the upper end of each fixed rod is provided with a first pressure rod, two ends of the first pressure rod are respectively inserted at the upper ends of the two fixed rods and are rotatably connected with the two fixed rods, the upper end of the adjusting rod is provided with a, the lead roller is arranged on the rack, a second motor is fixedly arranged on one side of the rack, and an output shaft of the second motor penetrates through one side of the rack and is fixedly connected with one end of the lead roller.

By adopting the technical scheme, the warps are conveyed to one side, and the disordered warps are divided into a plurality of ordered parts by the yarn dividing holes through the yarn dividing holes, so that the processing of the warps is facilitated, and the number of the divided warps is consistent with that of the yarn dividing holes. The warp passes through the lower part of the second pressure rod and then passes through the upper part of the first pressure rod, the first motor rotates forwards to drive the worm to rotate forwards, the worm drives the worm wheel to rotate forwards, the worm wheel drives the adjusting rod to move upwards, and the adjusting rod drives the second pressure rod to move upwards; the first motor rotates reversely to drive the worm to rotate reversely, the worm drives the worm wheel to rotate reversely, the worm wheel drives the adjusting rod to move downwards, the adjusting rod drives the second pressing rod to move downwards, the second pressing rod moves upwards and downwards to change the linear distance between the second pressing rod and the first pressing rod, and the second pressing rod enables warp yarns to be pressed downwards to be straightened, so that the warp yarns can be machined better.

As preferred, all set up the slide of slope on the lateral wall of frame both sides, the one end that the lead wire roller was kept away from to the slide is higher, two all be equipped with the slider in the slide, slider and slide sliding fit, be equipped with in the frame and receive and release the roller, the both ends of receiving and releasing the roller all have set firmly the traveller, two the traveller is pegged graft respectively on two sliders, and rotates with two sliders and be connected, be equipped with the extension spring in the slide, the inner wall fixed connection of the higher one end of one end and slide of extension spring, the other end of extension spring and one side fixed connection of slider.

By adopting the technical scheme, the warp yarns pass above the take-up and pay-off roller and are processed. When the warp is processed, one end of the warp can be pressed downwards, the warp can generate a downward pressure on the take-up and pay-off roller, so that the take-up and pay-off roller moves downwards to drive the two sliding columns to move downwards, and the two sliding columns can drive the two sliding blocks to move downwards along the slide way. The slide block moves downwards along the slide way, and the tension spring is stretched, so that the tension spring generates an elastic force. When the warp is not pressed downwards any more, the elastic force generated by the tension spring can generate a pulling force on the sliding block, so that the sliding block moves upwards along the slide way, the sliding block drives the sliding column to move upwards, and the sliding column drives the take-up and pay-off roller to move upwards along the slide way.

Preferably, clamping pieces are fixedly arranged on two sides of the sliding block and respectively located on two sides of the sliding way, and the diameter of each clamping piece is larger than the width of the sliding way.

By adopting the technical scheme, the two clamping pieces are respectively positioned at two sides of the slideway, and the sliding block is fixed in the slideway, so that the sliding block cannot be separated from the slideway.

As preferred, all set firmly the guide block on the lateral wall of separated time board both sides, two guide slots have been seted up to the symmetry on the lateral wall of frame, two the guide block is located two guide slots respectively, and with guide slot sliding fit, two all be equipped with a plurality of constant head tanks on the guide slot, every all be equipped with two spacers in the guide slot, spacer and constant head tank cooperation, one side of spacer has set firmly locating piece one, the opposite side of spacer is equipped with the linkage segment, be equipped with locating piece two on the linkage segment, be equipped with the spread groove on the locating piece two, the spread groove cooperates with the linkage segment.

By adopting the technical scheme, the guide block slides along the guide groove to drive the wire distributing plate to move along the length direction of the guide groove, so that the distance between the wire distributing plate and the let-off roller is changed. When the distributing board moves to a proper position, the two positioning pieces are inserted into the positioning grooves on the two sides of the position where the sliding block is located at the moment, the sliding block is clamped, the sliding block can not move along the sliding groove any more, and therefore the distributing board is fixed at the position where the distributing board is located at the moment.

Preferably, the rack is symmetrically provided with two rotating holes, the two rotating rods are respectively inserted into the two rotating holes and are in rotating fit with the rotating holes, and the inner walls of the two rotating holes are respectively fixedly provided with a friction pad which is in contact with the rotating rods.

By adopting the technical scheme, when the equipment stops running, the friction pad can generate friction on the rotating rod, so that the rotating rod can not rotate continuously under the action of inertia

Preferably, the side walls of the first pressure lever, the second pressure lever, the wire leading roller and the take-up and pay-off roller are respectively provided with an annular groove, and the annular grooves are matched with the wire dividing holes one by one.

By adopting the technical scheme, the warp yarns are divided into the bundles by the yarn dividing holes, and the bundles of warp yarns can be clamped in the ring grooves in the conveying process, so that the bundles of warp yarns cannot be mixed together in the conveying process, and the warp yarns can be better transmitted.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment;

FIG. 2 is an enlarged view of area A of FIG. 1;

FIG. 3 is a sectional view of the embodiment;

FIG. 4 is an enlarged view of area B of FIG. 3;

fig. 5 is another cross-sectional view of the embodiment.

Reference numerals: 1. a frame; 11. hole turning; 12. a friction pad; 2. putting a warp roller; 21. a rotating rod; 3. a wire distributing plate; 31. a wire dividing hole; 32. a guide block; 33. a guide groove; 34. positioning a groove; 4. a support; 41. a cross bar; 42. fixing the rod; 43. adjusting a rod; 44. a worm gear; 45. an external thread; 46. a worm; 47. a first motor; 48. a first pressure lever; 49. a second pressure lever; 5. a wire guide roller; 51. a second motor; 6. a slideway; 61. a slider; 611. a position clamping sheet; 62. a take-up and pay-off roller; 63. a traveler; 64. a tension spring; 7. positioning plates; 71. a first positioning block; 72. a second positioning block; 8. and a ring groove.

Detailed Description

The following is only the preferred embodiment of the present invention, the protection scope is not limited to this embodiment, and all technical solutions belonging to the idea of the present invention should belong to the protection scope of the present invention. It should also be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and such modifications and decorations should also be regarded as the protection scope of the present invention.

As shown in fig. 1 and 3, a warp feeding device of a warp knitting machine comprises a frame 1, a warp placing roller 2 is arranged on one side of the frame 1, rotating rods 21 are fixedly arranged at two ends of the warp placing roller 2, the two rotating rods 21 are respectively inserted into side walls on two sides of the frame 1 and are rotatably connected with the side walls of the frame 1, two rotating holes 11 are symmetrically formed in the frame 1, the two rotating rods 21 are respectively inserted into the two rotating holes 11 and are rotatably matched with the rotating holes 11, friction pads 12 are fixedly arranged on inner walls of the two rotating holes 11, the friction pads 12 are in contact with the rotating rods 21, when the device stops operating, the friction pads 12 can generate friction on the rotating rods 21, so that the rotating rods 21 can not rotate continuously under the action of inertia, the warp placing roller 2 can not rotate continuously under the action of inertia, and warp yarns can not output continuously to one side.

As shown in fig. 1 and 3, a distributing board 3 is disposed on the frame 1, a plurality of distributing holes 31 are disposed on the distributing board 3, the distributing holes 31 are uniformly distributed along the length direction of the distributing board 3, guide blocks 32 are fixedly disposed on the side walls of the two sides of the distributing board 3, two guide grooves 33 are symmetrically disposed on the side wall of the frame 1, and the two guide blocks 32 are respectively disposed in the two guide grooves 33 and are in sliding fit with the guide grooves 33.

All be equipped with a plurality of constant head tanks 34 on two guide slots 33, all be equipped with two spacer 7 in every guide slot 33, spacer 7 and constant head tank 34 cooperation. One side of the positioning piece 7 is fixedly provided with a first positioning block 71, the other side of the positioning piece 7 is provided with a connecting section, the connecting section is provided with a second positioning block 72, the second positioning block 72 is provided with a connecting groove, and the connecting groove is matched with the connecting section.

The warp is conveyed to one side, the disordered warp is divided into a plurality of ordered parts through the distributing holes 31, the processing of the warp is facilitated, and the number of the divided warp is consistent with that of the distributing holes 31.

The guide block 32 slides along the guide groove 33 to drive the yarn dividing plate 3 to move along the length direction of the guide groove 33, so that the distance between the yarn dividing plate 3 and the let-off roller 2 is changed, the length of the warp between the let-off roller 2 and the yarn dividing plate 3 is changed, the elasticity of the warp between the let-off roller 2 and the yarn dividing plate 3 can be adjusted, and the warp is straightened.

When the distributing board 3 moves to a proper position, the two positioning pieces 7 are inserted into the positioning grooves 34 on the two sides of the position where the sliding block 61 is located at the moment, and the sliding block 61 is clamped, so that the sliding block 61 can not move along the sliding groove any more, and the distributing board 3 is fixed at the position where the distributing board is located at the moment. After the positioning piece 7 is inserted into the positioning groove 34, the first positioning block 71 is clamped on one side of the positioning groove 34, the positioning piece 7 is prevented from penetrating through the positioning groove 34 and sliding off from the other side of the positioning groove 34, and after the positioning piece 7 is inserted into the positioning groove 34, the connecting groove of the second positioning block 72 is sleeved on the connecting section, so that the second positioning block 72 is fixed with the positioning piece 7. The second positioning block 72 is clamped at the other side of the positioning groove 34, so that the positioning sheet 7 cannot slide down from the positioning groove 34, the positioning sheet 7 is fixed in the positioning groove 34, and the position of the sliding block 61 is fixed.

As shown in fig. 1 and 2, two supports 4 are arranged on the rack 1, the two supports 4 have the same structure, the side walls of the two supports 4 are respectively and fixedly connected with the side walls of the two sides of the rack 1, each support 4 comprises a cross rod 41, a fixing rod 42 and an adjusting rod 43, and the lower end of the fixing rod 42 is fixedly connected with the side wall of one side of the cross rod 41.

As shown in fig. 2 and 4, the cross rod 41 is provided with an adjusting opening, the lower end of the adjusting rod 43 passes through the adjusting opening and is slidably connected with the adjusting opening, an installation cavity is arranged in the adjusting opening, and a worm wheel 44 is arranged in the installation cavity. The center of the worm wheel 44 is provided with a threaded hole, the side wall of the lower end of the adjusting rod 43 is fixedly provided with an external thread 45, and the lower end of the adjusting rod 43 passes through the threaded hole and is matched with the threaded hole. The cross rods 41 are internally provided with cavities, one side of the mounting cavity is communicated with one side of the cavities, the cavities are internally provided with worms 46, the worms 46 are meshed with worm wheels 44, one ends of the two cross rods 41 are respectively provided with a first motor 47, the side wall of the first motor 47 is fixedly connected with the side wall of the rack 1, and the output shaft of the first motor 47 penetrates through one end of each cross rod 41 and is fixedly connected with one end of each worm 46.

As shown in fig. 2 and 4, the upper ends of the fixing rods 42 are provided with a first pressing rod 48, and both ends of the first pressing rod 48 are respectively inserted into the upper ends of the two fixing rods 42 and rotatably connected with the two fixing rods 42. The upper ends of the adjusting rods 43 are provided with second pressure rods 49, and two ends of the second pressure rods 49 are respectively inserted into the upper ends of the two adjusting rods 43 and are rotatably connected with the two adjusting rods 43.

Warp passes below the second pressure rod 49 and then passes above the first pressure rod, the first motor 47 rotates positively to drive the worm 46 to rotate positively, the worm 46 drives the worm wheel 44 to rotate positively, the worm wheel 44 drives the adjusting rod 43 to move upwards, and the adjusting rod 43 drives the second pressure rod 49 to move upwards; the first motor 47 rotates reversely to drive the worm 46 to rotate reversely, the worm 46 drives the worm wheel 44 to rotate reversely, the worm wheel 44 drives the adjusting rod 43 to move downwards, the adjusting rod 43 drives the second pressing rod 49 to move downwards, the second pressing rod 49 moves upwards and downwards to change the linear distance between the second pressing rod 49 and the first pressing rod 48, and the second pressing rod 49 enables warp yarns to be pressed downwards to be straightened, so that the warp yarns can be processed better.

As shown in fig. 1 and 5, a lead roller 5 is arranged on the frame 1, a second motor 51 is arranged on one side of the frame 1, and an output shaft of the second motor 51 penetrates through one side of the frame 1 and is fixedly connected with one end of the lead roller 5. And the second motor 51 is started to drive the lead roller 5 to rotate, and the lead roller 5 generates friction on the warp yarns to pull the warp yarns to one side so that the warp yarns can move to one side of the device.

As shown in fig. 1 and 2, the frame 1 is provided with a take-up and pay-off roller 62, the side walls of the take-up and pay-off roller 62 are provided with ring grooves 8, the ring grooves 8 are matched with the yarn dividing holes 31 one by one, and yarns pass through the ring grooves 8 in the take-up and pay-off roller 62, so that a plurality of bundles of warp yarns cannot be mixed together, and the processing of the warp yarns is facilitated.

As shown in fig. 1 and 5, an inclined slide 6 is disposed on a side wall of the frame 1, one side of the slide 6, which is far away from the lead roller 5, is higher, a slide block 61 is disposed in the slide 6, the slide block 61 is in sliding fit with the slide 6, two sides of the slide block 61 are fixedly provided with two position-locking pieces 611, the two position-locking pieces 611 are respectively located on two sides of the slide 6, and a diameter of each position-locking piece 611 is greater than a width of the slide 6. The two clamping pieces 611 are respectively located at two sides of the slide way 6, and fix the slide block 61 in the slide way 6, so that the slide block 61 cannot be separated from the slide way 6.

As shown in fig. 1 and 5, sliding columns 63 are arranged on both sides of the take-up and pay-off roller 62, the two sliding columns 63 are respectively inserted into the two sliding blocks 61 and rotatably connected with the sliding blocks 61, a tension spring 64 is arranged inside the sliding way 6, one end of the tension spring 64 is fixedly connected with the inner wall of the higher end of the sliding way 6, and the other end of the tension spring 64 is fixedly connected with one side of the sliding block 61.

The warp yarn passes over the take-up and pay-off roller 62, and then is processed. When the warp is processed, one end of the warp is pressed downwards, the warp generates a downward pressure on the winding and unwinding roller 62, the winding and unwinding roller 62 moves downwards, the two sliding columns 63 are driven to move downwards, and the two sliding columns 63 drive the two sliding blocks 61 to move downwards along the slide way 6. The slider 61 moves downward along the slide 6, and the tension spring 64 is stretched, so that the tension spring 64 generates an elastic force. When the warp is no longer pressed downwards, the elastic force generated by the tension spring 64 generates a pulling force on the sliding block 61, so that the sliding block 61 moves upwards along the slideway 6, the sliding block 61 drives the sliding column 63 to move upwards, and the sliding column 63 drives the take-up and pay-off roller 62 to move upwards along the slideway 6.

When the warp is processed, the take-up and pay-off roller 62 repeats the above operation, so that the warp is not broken when being processed, and the warp can be processed more favorably.

Claims

1. A warp let-off device of a warp knitting machine comprises a frame (1) and is characterized in that a warp let-off roller (2) is arranged on one side of the frame (1), rotating rods (21) are fixedly arranged at two ends of the warp let-off roller (2), the two rotating rods (21) are respectively inserted into side walls on two sides of the frame (1) and are rotatably connected with the side walls of the frame (1), a distributing plate (3) is arranged on the frame (1), a plurality of distributing holes (31) are formed in the distributing plate (3), the distributing holes (31) are uniformly distributed along the length direction of the distributing plate (3), two supports (4) are arranged on the frame (1), the two supports (4) are identical in structure, the side walls of the two supports (4) are respectively fixedly connected with the side walls on two sides of the frame (1), each support (4) comprises a cross rod (41), a fixing rod (42) and an adjusting rod (43), the lower end of the fixing rod (42) is fixedly connected with the side wall of one side of the cross rod (41), an adjusting opening is formed in the cross rod (41), the lower end of the adjusting rod (43) penetrates through the adjusting opening and is in sliding connection with the adjusting opening, an installation cavity is formed in the adjusting opening, a worm wheel (44) is arranged in the installation cavity, a threaded hole is formed in the circle center of the worm wheel (44), external threads (45) are fixedly arranged on the side wall of the lower end of the adjusting rod (43), the lower end of the adjusting rod (43) penetrates through the threaded hole and is matched with the threaded hole, a cavity is formed in the cross rod (41), one side of the installation cavity is communicated with one side of the cavity, a worm (46) is arranged in the cavity, the worm (46) is meshed with the worm wheel (44), one end of each of the two cross rods (41) is provided with a first motor (47), and, an output shaft of the first motor (47) penetrates through one end of the cross rod (41) and is fixedly connected with one end of the worm (46), a first pressure rod (48) is arranged at the upper end of each fixed rod (42), two ends of the first pressure rod (48) are respectively inserted into the upper ends of the two fixed rods (42) and are rotatably connected with the two fixed rods (42), a second pressure rod (49) is arranged at the upper end of each adjusting rod (43), two ends of the second pressure rod (49) are respectively inserted into the upper ends of the two adjusting rods (43) and are rotatably connected with the two adjusting rods (43), a lead roller (5) is arranged on the rack (1), a second motor (51) is fixedly arranged on one side of the rack (1), and an output shaft of the second motor (51) penetrates through one side of the rack (1) and is fixedly connected with one end of the lead roller (5).

2. Warp let-off device for a warp knitting machine according to claim 1, characterized in that the side walls of the frame (1) on both sides are provided with inclined slideways (6), one end of each slide way (6) far away from the lead roller (5) is higher, slide blocks (61) are arranged in each slide way (6), the slide block (61) is in sliding fit with the slide way (6), the frame (1) is provided with a receiving and releasing roller (62), sliding columns (63) are fixedly arranged at two ends of the take-up and pay-off roller (62), the two sliding columns (63) are respectively inserted on the two sliding blocks (61), and is rotationally connected with the two sliding blocks (61), a tension spring (64) is arranged in the slideway (6), one end of the tension spring (64) is fixedly connected with the inner wall of the higher end of the slide way (6), the other end of the tension spring (64) is fixedly connected with one side of the sliding block (61).

3. The let-off device of a warp knitting machine according to claim 2, characterized in that the two sides of the sliding block (61) are respectively fixedly provided with a position clamping piece (611), the two position clamping pieces (611) are respectively arranged at the two sides of the sliding way (6), and the diameter of the position clamping piece (611) is larger than the width of the sliding way (6).

4. Let-off device for a warp knitting machine according to claim 1, characterized in that the side walls of the thread-dividing plate (3) on both sides are provided with guide blocks (32), two guide grooves (33) are symmetrically arranged on the side wall of the frame (1), two guide blocks (32) are respectively positioned in the two guide grooves (33), and is matched with the guide grooves (33) in a sliding way, a plurality of positioning grooves (34) are respectively arranged on the two guide grooves (33), two positioning sheets (7) are respectively arranged in each guide groove (33), the positioning sheet (7) is matched with the positioning groove (34), a first positioning block (71) is fixedly arranged on one side of the positioning sheet (7), the other side of the positioning sheet (7) is provided with a connecting section, a second positioning block (72) is arranged on the connecting section, and a connecting groove is arranged on the second positioning block (72), and the connecting groove is matched with the connecting section.

5. The let-off device of a warp knitting machine as claimed in claim 1, characterized in that two rotation holes (11) are symmetrically formed in the frame (1), two rotation rods (21) are respectively inserted into the two rotation holes (11) and rotatably engaged with the rotation holes (11), friction pads (12) are fixedly arranged on inner walls of the two rotation holes (11), and the friction pads (12) are in contact with the rotation rods (21).

6. The let-off device of a warp knitting machine as claimed in claim 1, characterized in that the side walls of the first pressure lever (48), the second pressure lever (49), the yarn guide roller (5) and the take-up and pay-off roller (62) are provided with ring grooves (8), and the ring grooves (8) are matched with the yarn dividing holes (31) one by one.