Instruction Manual - TSUBAKIMOTO
Transcript of Instruction Manual - TSUBAKIMOTO
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Timing Belts & Pulleys Safety Use In order to ensure correct handling of the products, please make sure to read the belt catalog and
instructions thoroughly upon use paying close attention to the items below, which have been classified
according to the degree of influence on safety.
Definition
Terms
Danger When it is assumed the death or serious personal injury is imminent as a result of
incorrect handling.
Warning When it is assumed that death or serious personal injury is possible as a result of
incorrect handling.
Caution When it is assumed that there is a risk of personal injury and /or material damage as a
result of incorrect handling.
Applications and Objectives of Use
Danger When it is foreseen that idling and equipment stoppage caused by cutting of the belt will lead to an
accident resulting in death or serious personal injury, make sure to install a safety device.
Danger Do not use the belt as a harness or tow rope.
Warning When it is foreseen that static electricity generated by operation of the belt may lead to the mistaken
use of a fire extinguisher, please install a static electricity prevention device in the equipment.
Caution Do not use the belt as an insulator. Since insulating properties vary depending on the type of belt,
please consult TSUBAKI.
Caution When the belt comes into direct contact with food, make sure to use a belt which complies with the Food
Sanitation Law.
Caution Do not carry out additional procession got in the belt. Quality and performance of the belt is likely to
deteriorate as a result.
Function and Performance
Caution Do not use the belt in any way other than indicated in each belt catalog, design data, etc. or outside the
tolerance levels. Premature breakage of the belt may occur.
Caution Adhesion of water , oil, chemicals, paint, dust, etc. to the pulley or belt will result in deterioration of
transmission power and possibly cause premature breakage.
Caution Noise may become large during high-speed operation of the belt. In this case please install a sound
insulation cover.
Storage and Transportation
Caution When transporting or handling heavy belts and pulleys, make sure to use transportation
equipments/apparatuses, etc. suitable for weight involved.
Caution Do not forcefully bend or place heavy items on the belt during transportation or storage, as this will
result in creasing/damage and cause premature breakage of the belt.
Caution Keep the belt stored at a temperature range of –10℃ to +40℃ in a low humidity place.
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Installation and Mobility
Danger Make sure to install a safety cover over all rotating parts including the belt and pulley. There is a
possibility of hair, gloves, clothes, etc. getting caught in the belt and pulley. Moreover, breakage of the
belt or pulley may cause an injury from flying fragments.
Danger Abide by the following during maintenance, inspection or replacement of the belt and pulley.
(1) Make sure to disconnect the power and wait for the belt and pulley to stop completely before
starting.
(2) Where there is a possibility of the machine starting from removal of the belt. Secure the machine in
advance before staring work
(3) Ensure that the power can not be switched on accidentally.
Caution When replacing belt or pulley, ensure that the same type is used. Replacement with a different type
may lead to premature breakage.
Caution Deviation in the pulley alignment will cause premature breakage or flange omission. Please carry out
adjustments as required.
Caution Loosen the belt tension when replacing it. Do not force the belt over the flange of the pulley by using a
screwdriver or similar implement, as this will cause premature breakage of the belt and shaft.
Caution When installing the belt, make sure to use proper tension as indicated in the catalog and design data.
Improve tension may result in premature breakage of the belt and shaft.
Caution Carry out the following when additional processing on the pulley is required before use:
・Remove burrs and sharp corners;
・Check precision of dimension after processing;
・Check strength of pulley after processing;
Caution When attaching the flange to the pulley, make sure no foreign particles exist between the pulley and
flange, and secure them to prevent ratting in the flange by calking. Unsuitable fitting will cause the
flange to come off.
Inspection
Caution Carry out regular inspections of the belt and pulley, and replace them when you notice anything out of
the ordinary.
Handling of Used Items
Caution Do not burn the belt. Harmful gasses may be generated.
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Contents
Timing belt safety use----------------------------------------------------------------------------2
Structure---------------------------------------------------------------------------------------------5
Layout design---------------------------------------------------------------------------------------6
Mounting----------------------------------------------------------------------------------------------9
Periodic Inspection Procedure-----------------------------------------------------------------12
Trouble shooting-----------------------------------------------------------------------------------13
ULTRA PX belt HC Type (UP8M/14M)
PX belt
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Structure
Backing : Durable and wear-resistant rubber
Cord : Fiberglas with very minimal growth
Tooth rubber : Same material as the backing to realize high-power drive.
Fabric : Nylon with superior wear-resistance
Backing Fabric
Tooth rubber
Cord
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Timing belt has the property of deviating towards the axial direction of pulley during operation. Accordingly, mount the
guide-flange on the pulley to prevent the belt from coming off the pulley. Setting standards for guide-flange are as follows.
■Horizontal biaxial transmission
Mount two guide flanges on both sides of one of the two pulleys, or one each on opposite sides of both pulleys.(EX1)
When the distance between centers of pulley is over eight times longer than outside diameter (do) of the small pulley,
mount the flange on both sides of both pulley.(EX2)
■Transmission of vertical axis
The belt is liable to be disengaged to the lower side by empty weight. Mount the guide flange on the lower side of one
pulley and on both sides of the other pulley.
■Multi-axial transmission
Mount the guide flange on both sides(EX1)at every other side of pulley or on one side of whole pulley(EX2).
■Use of idler
The idler is used in the following cases.
・When adjusting the mounting tension by fixing the bearing.
・when speed ratio is great and small pulley has numerous number of teeth.
・When belt guide is impossible by driving and driven pulley.
■Cautions when using idler
・The idler should be of fixed type. Be sure to use it on the slag side.
・Pay attention to the fact that the belt may be disengaged from the pulley if the degree of parallelization of
the axial core between idler and both axes becomes defective.
・The idler diameter should be decided by following.
*Inside idler・・・Pulley with teeth exceeding the minimum number.
*Outside idler・・・Flat pulley without crown with 1.2 times the pitch-circle diameter or more of smallest pulley.
Layout design
Mounting of guide flange
Use of idler
Center distance ≥do×8
(EX1) (EX2)
(EX1) (EX2)
do
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■Minimum number of pulley teeth (Rubber belt)
・PX / ULTRA PX-HC
Speed r/min
TYPE ≧900
900<
≧1200
1200<
≧1800
1800<
≧3600
P2M
P3M ・・・・UP3M-HC
P5M ・・・・UP5M-HC
P8M ・・・・UP8M-HC
P14M・・・・UP14M-HC
16 14 18 24 28
16 14 20 26 28
18 16 24 26 28
20 18 28 28 34
・TRAPEZOIDAL
Speed r/min
TYPE ≧900
900<
≧1200
1200<
≧1800
1800<
≧3600
3600<
≧4200
※※※※MXL ※※※※XL ※※※※L ※※※※H
10 10 12 14
12 10 12 16
14 12 14 18
16 12 16 20
16 14 18 22
■Minimum number of pulley teeth (Urethane belt)
・LONG / FLEX / JOINT
TYPE Minimum number
of teeth Outside idler
mm TYPE
Minimum number of teeth
Outside idler mm
T5 T10 T20 AT5 AT10 AT20
12 14 15 14 15 18
30 60 120 60 100 120
RPP5 RPP8 RPP14
※※※※XL ※※※※L ※※※※H
12 18 28 10 12 14
60 100 120 30 60 80
・ENDLESS (MOLDING)
Speed r/min
TYPE ≧900
900<
≧1200
1200<
≧1800
1800<
≧3000
T2.5 T5 T10
※※※※MXL ※※※※XL ※※※※L
16 12 16 14 10 12
16 14 18 16 11 12
18 16 20 16 12 14
20 18 22 16 12 16
Inside Idler Outside Idler
※Date of JIS standard ‘’trapezoidal tooth belts’’ We are discontinued Product.(September 30, 2013)
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In the transmission of only driving and pulleys, without using an idler, provide the adjusting margin (table below) of the
distance between axes at the bearing including the manufacturing length (tolerance) of belt.
■Adjusting margin of inter-axial distance for bi-axial transmission
・Without TRAPEZOIDAL BELT
TYPE
Belt length Belt pitch
Less than 5 mm Belt pitch
More than 8 mm
⊿Co
≧500
500~1000
1001~2000
2000≦
3 5 10 15
3 5 10 15
⊿Ci common 10 15
・TRAPEZOIDAL BELT
TYPE
Belt length ※※※※MXL ※※※※XL ※※※※L ※※※※H
⊿Co
≧200
201~ 390
391~ 800
801~1200
1201≦
3 5 10 15 22
3 5 10 15 25
3 5 10 15 25
3 5 10 15 25
⊿Ci common 5 5 10 15
Timing belt does not turn at pulley center even when pulley-alignment is exact, and it is liable to deviate on either side.
That force is very weak and when pulley alignment is poor, belt-side may be damaged. In extreme cases, it may run on
the guide flange and break. Accordingly, adjust the alignment of pulley within the allowable range listed below.
■Allowable degree of parallelization
Belt width mm ≧30 30~50 50~100 100≦
Allowable degree
of parallelization ≧5/1000 ≧4/1000 ≧3/1000 ≧2/1000
θ (min) ≧17 ≧13 ≧10 ≧6
■How to adjust of pulley
As shown in the diagram, apply the straight edge to the end face of the pulley which is to be standard. Make the other
pulley contact with straight edge on all faces (to make ε=0). It is possible to take axial degree of parallelization
simultaneously.
Adjustment of distance between two axes
Alignment of pulley
Adjusting range to the inside
C
⊿Ci
⊿Co
θ
θ
ε δ
Do
Straight edge
Standard pulley
δ=Do×allowable degree of parallelization
Adjusting range to the inside
※Date of JIS standard ‘’trapezoidal tooth belts’’ We are discontinued Product.(September 30, 2013)
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■Mounting tension of belt
Timing belt transmission is an engagement transmission and proper tension is necessary for smooth transmission and
prevention of tooth overpass. Weak tension may cause engaging discordance while strong tension may cause noise.
Both situations shorten the service life.
■How to apply tension
1.Including the idler-axis, the degree of parallelization for all axes and alignment of pulley can be given exactly.
2.Pressing force (F) is applied to the center of the belt span.
3.The bending(δ) of the belt will produce tension of 1.6mm per 100mm span.
■How to obtain the pressing force(F)
Mounting
Mounting tension of belt
A
B
F
t
δ
C
φ
16
L
YtTi
F
×+
=
4
)( 22 dpDpct
−−=
F:necessary load for the bending(δ) at the center of span “t” N{kgf}
Ti:Mounting tension N{kgf}
Y:Correcting index (based on list below)
δ:Bending mm 0.016t
t:Span length mm
C:Distance between axes mm
Dp:Pitch-circle diameter of large pulley mm
dp:Pitch-circle diameter of small pulley mm
L:Belt length mm
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■PX TYPE
TYPE Belt width
mm
Mounting tension Ti N{kgf} Correcting index Y recommended Maximum
P2M 4 6 10
5.9{ 0.6} 9.8{ 1.0}
17 { 1.7}
7.8{ 0.8} 13 { 1.3} 23 { 2.3}
0.6{ 0.06} 0.9{ 0.09} 1.6{ 0.16}
P3M・・・・P3M-W 6 10 15
20 { 2.0} 34 { 3.5} 55 { 5.6}
26 { 2.7} 46 { 4.7} 74 { 7.5}
1.1{ 0.11} 1.9{ 0.19} 3.0{ 0.31}
UP3M-HC 6 10 15
29 { 3.0} 54 { 5.5} 88 { 9.0}
40 { 4.1} 72 { 7.3}
118 { 12.0}
21.6{ 2.2 } 34.3{ 3.5 } 52.0{ 5.3 }
P5M・・・・P5M-W
UP5M-HC/HA
10 15 25
108 { 11.0} 167 { 17.0} 304 { 31.0}
147 { 15.0} 225 { 23.0} 412 { 42.0}
56.9{ 5.8 } 82.4{ 8.4 }
201 { 20.5 }
P8M・・・・P8M-W
15 25 40 60
225 { 23.0} 382 { 39.0} 657 { 67.0}
1040 { 106 }
294 { 30.0} 510 { 52.0} 860 { 88.0}
1370 { 140 }
135 { 13.8 } 239 { 24.4 } 419 { 42.8 } 628 { 64.1 }
UP8M-HC/HA
15 25 40 60
177 { 18.0} 304 { 31.0} 530 { 54.0} 834 { 85.0}
235 { 24.0} 408 { 41.6} 690 { 70.4}
1100 { 112 }
135 { 13.8 } 239 { 24.4 } 419 { 42.7 } 628 { 64.0 }
P14M
40 60 80 100 120
990 { 101 } 1500 { 153 } 2110 { 215 } 2710 { 276 } 3340 { 341 }
1310 { 134 } 2000 { 204 } 2810 { 286 } 3610 { 368 } 4450 { 454 }
502 { 51.2 } 837 { 85.4 }
1000 {102 } 1260 {128 } 1680 {171 }
UP14M-HC
40 60 80 100 120
794 { 81.0} 1200 { 122 } 1690 { 172 } 2170 { 221 } 2680 { 273 }
1050 { 107 } 1600 { 163 } 2250 { 229 } 2880 { 294 } 3560 { 363 }
502 { 51.2 } 837 { 85.3 }
1000 {102 } 1260 {128 } 1680 {171 }
■TRAPEZOIDAL
TYPE
Belt width mm
Mounting tension Ti N{kgf} Correcting index Y
Code mm recommended Maximum
※※※※MXL
3.2 4.8 6.4 9.5 12.7
3.2 4.8 6.4 9.5 12.7
2.06{ 0.21} 3.14{ 0.32} 4.12{ 0.42} 6.17{ 0.63} 8.23{ 0.84}
4.90{ 0.50} 8.33{ 0.85}
11.76{ 1.20} 18.13{ 1.85} 24.99{ 2.55}
4.22{ 0.43} 6.67{ 0.68} 9.32{ 0.95}
14.6 { 1.49} 20.4 { 2.08}
※※※※XL 025 031 037
6.4 7.9 9.5
13.7 { 1.4 } 19.6 { 2.0 } 24.5 { 2.5 }
29.4 { 3.0 } 37.2 { 3.8 } 44.1 { 4.5 }
11.8 { 1.20} 16.4 { 1.67} 22.0 { 2.24}
※※※※L 050 075 100
12.7 19.1 25.4
51.9 { 5.3 } 87.2 { 8.9 }
122.5 { 12.5 }
76.4 { 7.8 } 124.5 { 12.7 } 174.4 { 17.8 }
38.3 { 3.91} 65.2 { 6.65} 91.3 { 9.31}
※※※※H
075 100 150 200 300
19.1 25.4 38.1 50.8 76.2
221.5 { 22.6 } 311.6 { 31.8 } 486.1 { 49.6 } 667.4 { 68.1 }
1046.64{106.8 }
293.0 { 29.9 } 420.4 { 42.9 } 645.8 { 65.9 } 888.9 { 90.7 }
1390.6 {141.9 }
193 { 19.7 } 264 { 26.9 } 419 { 42.7 } 558 { 56.9 }
1004 {102.4 }
Mounting tension chart (rubber belt)
※Date of JIS standard ‘’trapezoidal tooth belts’’ We are discontinued Product.(September 30, 2013)
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■LONG / FLEX / JOINT
Fa/2<Ti≦Fa Ti:Mounting tension N{kgf} Fa:The maximum effective tension N{kgf}
■Correcting index chart (LONG/FLEX/JOINT)
TYPE Belt width
mm
Correcting index
Y
T5
10 15 20 25
39 76 110 123
T10
15 20 25 50 75
165 215 273 568 864
T20 25 50 75
426 960 1472
AT5
10 15 25 50
82 141 233 506
AT10 25 50 75
426 960 1472
AT20 50 75
1440 2061
■ENDLESS(MOLDING)
Ti:Mounting tension N{kgf}
2 φ :Winding angle of small pulley °
Mounting tension chart (Urethane belt)
TYPE Belt width
mm
Correcting index
Y
RPP5
10 15 20 25 30 50 85 100 150
112 170 228 304 340 608 902 1048 1508
RPP8
10 15 20 30 50 85 100
187 270 387 573 909 1619 2022
RPP14
15 20 24 40 50 55 85 100 115 150
365 632 858 1574 2008 2144 3648 4288 4920 6528
TYPE Belt width
mm
Correcting index
Y
※※※※XL
6.4 7.9 9.5 12.7 19.1 25.4
24 29 39 54 86 116
※※※※L
9.5 12.7 19.1 25.4 38.1 50.8
78 105 169 230 356 481
※※※※H
12.7 19.1 25.4 38.1 50.8 76.2 101.6
105 169 230 356 481 732 983
TYPE
Belt width mm
Mounting tension Ti
N{kgf} Correcting index
Y Code mm recomme
nded Maximum
※※※※MXL 3.2 4.8 6.4
3.2 4.8 6.4
2.06{ 0.21}3.14{ 0.32}4.12{ 0.42}
4.90{ 0.50}8.33{ 0.85}
11.76{ 1.20}
0.20{ 0.02}0.39{ 0.04}0.59{ 0.06}
※※※※XL 025 031 037
6.4 7.9 9.5
13.7 { 1.4 }19.6 { 2.0 }24.5 { 2.5 }
29.4 { 3.0 }37.2 { 3.8 }44.1 { 4.5 }
3.82{ 0.39}5.39{ 0.55}7.55{ 0.77}
※※※※L 050 075 100
12.7 19.1 25.4
51.9 { 5.3 }87.2 { 8.9 }
122.5 { 12.5 }
76.4 { 7.8 }124.5 { 12.7 }174.4 { 17.8 }
44.1 { 4.5 }73.46{ 7.7 }
106.82{10.9 }
TYPE
Belt width mm
Mounting tension Ti
N{kgf} Correcting index
Y Recommen
ded Maximum
T2.5
3 5 7 10
1.96{ 0.20}3.04{ 0.31}4.51{ 0.46}6.47{ 0.66}
2.94{ 0.3 }4.90{ 0.5 }6.76{ 0.69}9.70{ 0.99}
0.20{ 0.02}0.39{ 0.04}0.88{ 0.09}1.08{ 0.11}
T5
5 10 15 20
9.8 { 1.0 }24.5 { 2.5 }
39.2 { 4.0 }56.8 { 5.8 }
14.7 { 1.5 }37.2 { 3.8 }58.8 { 6.0 }85.3 { 8.7 }
6.9 { 0.7 }16.7 { 1.7 }26.5 { 2.7 }38.2 { 3.9 }
T10 15 20 25
107.8 {11.0 }156.8 {16.0 }196.0 {20.0 }
161.7 {16.5 }235.2 {24.0 }294.0 {30.0 }
71.5 { 7.3 }104.9 {10.7 }130.3 {13.3 }
Axial load = 2Ti×sin Ф
Axial load
※Date of JIS standard ‘’trapezoidal tooth belts’’ We are discontinued Product.(September 30, 2013)
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■Tension adjusting
Check the initial tension and adjust the belt to the optimum tension. The timing belt initially elongates about
0.1% of the shaft-to-shaft length at the early stage of use, but thereafter the steady-state elongation is very
little. Therefore, by adjusting the initial tension after one month of use, the belt can be maintained in the
optimum condition.
■Visually check
Visually check the belt and if the following problem is found, review the adequacy of the belt, including
choosing the belt of other sizes. Also check the installation method and overload for any problem.
Problem Appearance
Abnormal wear of
mating flake
(Initial)
Facing fabric has been worn. → Replace.
Facing fabric has become fluffy and has looked
white and the texture of facing fabric has become unclear.
■Visually check
Visually check the belt and if the following problems are found, replace the belt.
Problem Appearance
Abnormal wear of
mating flake
Facing fabric has been worn and tooth
rubber is exposed.
(The tooth has become narrow.)
Crack on tooth root Crack
Missing tooth Cords is exposed
Abnormal wear
Note: Normal if side face appears
sharp as cut by a knife.
Edge rounded.
Abnormal wear
(Cords is frayed and exposed.)
Rupture on side
face.
Periodic Inspection Procedure
Periodic Inspection Procedure(After one month or after 100hour driving)
Biannually
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Trouble phenomena Causes Measure
1.early severing of belt
(a)(c)
1.Overload
2.Shock load
3.Bending of belt
Check the inertia of subject-moved body, prime
motor and using conditions, etc.
2.tear off / wear of belt side.
(g)
1.Poor degree of parallelization
of axis
2.Defective pulley arrangement.
3.lack of rigidity of the framework.
4.bent flange
Correct the degree
poor of parallelization.
Correct arrangement.
Make the framework more rigid.
Correct it or replace it with good flange.
3.Belt wear.
(d)(f)
1.Overload.
2.Excessive initial tension.
3.Defective tooth shape and
tooth dimension of pulley.
4.Use in dusty atmosphere.
Change design.
Adjust mounting tension.
Replace with pulley of correct tooth shape and
dimensional.
Improve atmosphere, or install cover.
4.Pitch line direction scar of
tooth face of belt.
(h)
1.Protruding belt run from end
of pulley.
2.belt runs on flange.
Correct the axial degree of parallelization and
alignment of pulley.
Apply proper mounting tension.
5.Tooth jump of belt
1.Shock load.
2.Lack of initial tension of belt.
3.Lack of rigidity of framework.
Increase belt size.
Apply proper tension for mounting.
Increase the number of pulley teeth or teeth
engaged by idler.
6.Shearing damage of belt
teeth. Results from troubles 3 and 5 Same as 3 & 5 , above.
7.Partial severing of belt
(b)
1.Engaged foreign matter.
2.Belt runs on flange.
Improve the environment or install a cover.
Apply proper tension when mount the belt and
make exact degree of parallelization of axis.
8.Shrinkage
(k) Swelling by oil
Improve surroundings to prevent oil splashing
or install a cover.
9.Elongation in appearance of
belt
Mutual approximation of axes
shifting.
Mount the bearing firmly, and prevent bearing
movement with stopper in case of great shock.
10.Softning and stickiness of
rubber
(j)
1.Slip of back-pressing idler.
2.Oil attachment
Apply proper mounting tension.
Reduce inertia of idler.
Improve surroundings or install cover.
11.Wear of pulley tooth.
(l)
1.Improper pulley material.
2.Use in dusty atmosphere Improve atmosphere or install a cover.
12.Noise
1.Excessive initial tension of belt.
2.Overload.
3.Defective arrangement of pulley
and degree of parallelization of
axis.
Apply proper mounting tension.
Enlarge the size.
Adjust (correct) axial degree of parallelization
and arrangement of pulley
。
Trouble shooting
Trouble phenomena and measure
- - - 14 -
Type of damage Appearance Content
(a)
Belt severance
<Appearance>
Core-wire is bared lengthways.
<Cause>
Defective pulley alignment. Tooth jump of belt
due to engagement with foreign material.
(b)
Partial
severance of
belt
<Appearance>
Belt is partially severed. A scar may be seen due
to engagement with foreign material.
<Cause>
Defective pulley alignment. Tooth jump of belt
due to engagement with foreign material.
(c)
Early severance
of belt
<Appearance>
As seen in the picture, the belt is severed parallel
to the teeth, and the core-wire is also severed and
the bared core-wire is short and lined
.<Cause>
The belt is bent when storing or mounting the
belt (core-wire breakage). Too small pulley
diameter.
(d)
Early belt teeth
wear
<Appearance>
Wear of tooth-face cloth (fluffy cloth fiber, whitish
discoloration caused by excessive wear of
rubber coating). Rubber is bared and the tooth
width shrinks.
<Cause>
Overload Lack of belt tension (big chance of
belt wear) Too much belt tension.
(e)
Tooth shearing
<Appearance>
Crack at tooth root. Belt tooth disappears and the
belt becomes like a flat belt.
<Cause>
Defective tension Tooth jump due to shock
load. Tooth shear may be the terminal condition
of trouble (f).
(f)
Tooth root Wear
<Appearance>
Wear of cloth around tooth root area and the
core-wire is bared
.<Cause>
Too much tension. Improper belt size (lack of
belt ability).
Type of damage
- - - 15 -
Type of damage Appearance Content
(g)
Tearing-off and
wear of side
face of belt
<Appearance>
The edge is rounded and the belt-core is coming apart.
<Cause>
Belt is scraped against pulley flange due to
defective alignment.
(h)
Longitudinal
line along teeth
<Appearance>
Scar due to the belt running on the flange.
<Cause>
Belt running on the pulley flange due to defective
alignment. Lack of belt tension.
(i)
Crack on the
back of belt
<Appearance>
Cracking occurs on the back of belt in parallel
with the teeth.
<Cause>
The temperature is too high (the rubber
hardens).The temperature is too low (the
rubber does not change). The pulley size or the
idler size is too small.
(j)
Sticky or
softened rubber
on the back of
belt
<Appearance>
Attachment of softened rubber on the back of the
belt, or is sticky.
<Cause>
Caused by oil.
(k)
Swollen belt
<Appearance>
The teeth rubber or the back rubber swells up.
<Cause>
Caused by oil.
(l)
Wear of pulley
teeth
<Appearance>
The part where the pulley teeth is touching the belt
wears, and bump occurs. The tooth-face roughens
.<Cause>
Improper pulley material. Attachment of dust.
Too much belt tension.