CA1246190A - Controller for winding unvulcanized rubber sheet - Google Patents

Abstract

SPECIFICATION
1. TITLE OF THE INVENTION
CONTROLLER FOR WINDING UNVULCANIZED RUBBER SHEET

2. ABSTRACT OF THE DISCLOSURE
A controller for winding an unvulcanized rubber sheet suitable for the formation of tires, transmitting belts and the like comprises a cylindrical drum rotated by a motor for winding the unvulcanized rubber sheet thereon, a conveyer for feeding the unvulcanized rubber sheet on the drum, a data processor for calculating a ratio of peripheral velocities of the drum and the feeding conveyer and a feeding quantity of the unvulcanized rubber sheet on the basis of a previously inputted data and a sequence control unit responsive to an output of the data processor for controlling a sequence operation of a movable portion.

Description

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(i) F1ELD OF THE INVENTION
The present in~ention relates to a controller for winding an unvulcanized rubber sheet, and more particularly to a controller for winding an unvalcanized rubber sheet applicable to a machine for molding tires and transmitting ` belts such as V belts~ flat belts and serrated toothed belts.
(ii) DESCRIPTION OF THE PRIOR ART
Heretofore, when an unvulcanized rubber sheet or an unvulcanized rubber sheet containing cloth, cords or short fibers ~hereinafter referred to as an unvulcanized rubber sheet in general) is wound on a drum having a cylindrical outer periphery, an operator draws out the unvulcani~ed rubber sheet through a plyservicer to adhere an end of the rubber sheet to the surface of the drum, rotates the drum by a predetermined quantity to wind the rubber sheet and then cuts the rubber sheet. Accordingly, there are drawbacks that much labor is required and the productivity and the quality thereof are greatly dependent on a skill of the ~perator.
20In order to remove the drawback~ and improve the operation, there have been proposed many manners such as a manner for winding an unvulcanized rubber sheet previou51Y
cut in a predètermined length on a drum and a manner disclosed in Japanese Patent Application Laid-open No.
2538144J83. However, in any manners, since the drum having a ~' ' ?.
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same peripheral length is used for a given period of time, it is necessary to change the setting condition such as the length of winding the rubber sheet on the drum when the peripheral length of the drum is varied. Accordingly, when the periphral length of the drum is frequently changed as in the molding of the transmitting belt which is a product having various types but manufactured in a small quantity, the actual rate of operation of facilities and operators is ~markab~ `
reduced and the rate of occurrence of defective products due to the mistake of setting condition is increased.

SUMMARY OF THE IN~ENTION
The present invention is to be proposed in view of -the above drawbacks in the prior art. An object of the present invention is to resolve the above drawbacks in the prior art and provide a controller for winding an unvulcanized rubber sheet capable of always attaining the correct winding operation of the rubber sheet automatically against the variation of the setting condition with the high working rate and preventing the occurrence of mistake of the operator.

Accordinglyç the gist of the present invention resides in a controller for winding an unvulcanized rubber sheet comprising a cylindrical drum rotated by a motor for winding the unvulcanized rubber sheet thereon, a conveyer for _ ~ _ ~L2gL~

feeding the unvulcanized rubber on the drum, a data processor for calculating a ratio of peripheral velocities of the drum and the feeding conveyer and a feeding quantity of the unvulcanized rubber sheet on the basis of a previously inputted data and a sequence control unit responsive to an output of the data processor for controlling a sequence operation of a movable portion.
~ riefly explaining the controller for winding the unvulcanized rubber sheet, one or both of the drum and the feeding conveyer are driven by a DC servomotor or a pulse motor to be capable of changing the speed of rotakion thereof continuously 90 that the peripheral velocities of the drum and the conveyer are electrically synchronized with each other. The variation of setting condition of the mechanical movable portion is made by the data processor on the basis of the previously inputted sequence order of the molding operation and the necessary data. With the controller so constructed, the mold~ng operation in which the setting condition is varied for each operating cycle can be attained with the high working rate and the occurrence of mistake such as wrong setting of the condition by the operator can be prevented. Further, the outer peripheral length of the drum (or the peripheral length corresponding to the length of a material attached on the drum) is measured in advance before the rubber sheet is wound on the drum, and the winding length ~z~

is automatically calculated on the basis of the measured data to set the calculated length. Thus, the peripheral length of the drum or the thickness of the material previously attached on the drum is automatically corrected so that the more exact winding operation can be attained.
Since *he above construction is provided in the present invention, the following effects are achieved.
According to the present invention, even if the setting conditions containing the outer peripheral length o~
the drum, for example, are varied for each operating cycle, the high working rate can be maintained by the automatic control and the correct winding operation can be always attained. Therefore, the occurrence of the operating error by the operator can be effectively prevented.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a cross sectlonal side view of a portion showing the configuration of an embodiment of the present invention;
Fig. 2 shows a drive mechanism for winding the unvulcanized rubber sheet as viewed from the front side in Fig. 1;
Figs. 3(A), (B~ and (C) show the winding procedure of the unvulcanized rubber sheet according to an embodiment of the present invention; and .

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Fig. 4 is a block diagram showir-g a necessary part of a controller according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
An embodiment of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to Figs. 1 to 4, numeral 1 denotes a drum having an actual outer periphery for the molding operation,

2 a head stock for rotatably supporting the drum 1 and including a drive unit for rotating the drum 1, 3 a fixed frame for a servicer, and 4 and 5 unvulcanized rubber sheets, respectively. Generally, a plurality of types of rubber sheets (two types of rubber sheets are shown) are provided and one or a plurality of types of the rubber sheets of them ; are wound on the drum 1 depending on a specification of a product. numerals 6 and 7 denote feeding units of the rubber sheets 4 and 5, respecti~ely. In the figure, only two sets of feeding units are provided but can be increased or decreased if desired.
The head stock 2 comprises a head stock houslng 10, a main shaft 8 which is rotatably supported to the head stock housing 10 through a bearing 9 and has one end on which the drum 1 is mounted detachably by means of known means and .... , ., .. ~ . . _ , . . .. . ... . .. . ... . .. . .. . . .

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the other end on which a pulley 11 is fixedly mounted, a pulse motor 15 directly coupled to a reduction gear 14l a pulley 13 fixedly mounted.on an output shaft of the reduction gear 14, a toothed belt 12 which is received on the pulley 11 and a proximity switch 16 of a high accuracy type which is fixedly mounted in the head stock housing 10 for detecting a projection 11a mounted on a peripheral side of the pulley 11.
A roller 18 for measuring the outer peripheral length of the material wound on the drum 1 is rotatably mounted on one end of a lever 19. A known pulse generator ~hereinafter referred to as PG) 22 is coup.led with a shaft oF
the roller 18 and the PG is to generate pulses co-responding to the rotational quantity of the roller 18, The other end of the lever 19 is fixedly mounted one end of a shaft 20 which is rotatably~ mounted on a bracket 21 fixed on the head stock housing 10. An air cylinder 17 not shown is coupled with the other end of the shaft 20 and the lever 19 is swung through the shaft 20 by the operation of the air cylinder 17.
Numeral 23 denotes a rr~ovable frarne for the feeding ~0 unit 6~ which is mounted on the fixed frame 3 slidably in the .direction perpendicular to the axial core of the drum 1 by a known guide means not shown. A feed screw 25 meshing with an internal thread 24 fixedly mounted on the movable frame 23 has both ends which are rotatably mounted in bearings 26 fixed on the fixed frame 3 and is coupled with a geared motor . - 7 -.... .. .. ......... .. . .. . ... . .

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28 with a brake fixedly mounted on the frame 3 through a coupling 27. The movable frame 23 is moved in the direction perpendicular to the axiai core of the drum 1 by operating the motor 28 and the movement quantity thereof is detected by the PG 29 mounted to the motor 28. Although not shown, -there is also provided with a limit switch for preventins the over-stroke of the movable frame 23.
Numeral 30 denotes a belt conveyer for feeding the rubber sheet, 31 a drive roll thereof, 32 a chute fixedly mounted on the movable frame 23 and 33 a known cutter mounted on the rnovable frame 23 for cuttin~ the rubber sheet with a predetermined angle in the moving direction of the rubber sheet. The cutter 33 includes a round knife, a knife heater or the like depending on the construction of the rubber sheet and includes a drive means or the like although not shown.
Numeral 34 denotes a photo-electric switch mounted on the movable frame 23 for detecting a cut end qb of the rubber shee-t 4.
Numeral 35 denotes a movable frame mounted on the frame 23 and moved slidably in the direction perpendicular to -the axial core of the drum 1 by operation of the air cylinder 37 not shown. A sponge roller 36 for pressing the rubber sheet 4 on the drum 1 is rotatably mounted on the movable frame 35.
The drive roll 31 is rotatably supported by ............ ..... ... .... .... . .... .. . .. .. . . .. . . . . . .

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bearings 40 mounted in the movable frame 23. A toothed belt 42 is provided between a pulley 41 mounted on one shaft of the drive roll 31 and a pulley 43 mounted on an output shaft of a pulse motor 44 fixedly mounted on the movable frame 23.
Thus, by operating the pulse motor 44, the drive roll 31 is rotated to feed the rubber sheet 4.
The feeding unit 7 has the same construction as the feeding unit 6 except that the length of the belt conveyer is different and therefore the description thereof will be omitted. Numeral 38 denotes a sponge roller identical with the roller 36 and which can be moved to a position 3~a by operation of the air cylinder 39 not shown. Numeral 45 denotes a pulse motor for driving the belt conveyer, 46 a geared motor~with a brake~ for moving a movable frame for the feeding unit 7 and 47 a PG for detecting the movement quantity of the mavable frame.
: Numeral 48 denotes a data processor which comprises a central processing uni-t ~hereinafter referred to as CPU) for performing the data processing in accordance with a previously inputted program, a full keyboard for inputting data indicatin~ the sequence of the molding operation, a : Braun tube display unit (hereinafter referred to as CRT) for indentifying the inputted data, a CRT interface for transmitting and receiving signals between the keyboard and the CRT and the CPU, a digital switch for inputting a _ 9 _ '`' ,L6~

material number of the rubber sheet supplied to the rubber sheet feeding unit not shown, a memory circuit containing a read-only-memory (ROM) and a randam-access-memory (RAM) for storing the indication data and the like, and an input/output interface for transmitting and receiving signals between the CPu and the sequence circuit unitand the like. Further, it is con~enient to add an external memory reading unit for reading the indication data from an external memory in which the indication data i5 stored pre~iouslY and a printer for recording the re5ultant data of the molding operation. The keyboard, the CRT and the digital switch may be conveniently mounted in an operating control described later.
Numeral 49 denotes a sequence circuit unit for controlling the operation of each units and which utilizes a programmable controller ~ generally named a sequencer) in this embodiment. Numeral 50 denotes an operating control includin~ an automatic~manual selector switch, a push-botton switch for start and stop, an indicating lamp and the like. Numerai 51 denotes a counter for counting the pulses generated from the PG 22 during one rotation of the drum 1, that is, until the proximity switch 16 is operated next after the switch 16 is operated once. Numera1 53 denotes a pulse generator used -to set the speed o~ rotation of the drum 1 at the time other than the winding time of the rubber sheet and ~ncluding a deYice~for setting the nu~ber~o~ generated pulse .

per second. Numeral 52 denotes a digital switch for setting the rotation quanti-ty of the drum 1 at the time other than the winding time.
Numeral 5~ denotes a pulse generator which is utilized when the rubber sheet is wound on the drum and generates pulses at a predetermined P/S until the number of generated pulses reaches a value designated by the data processor 48.
Numerals 55 and 56 denote frequency dividers for di~iding the pulse signals generated from the pulse generator 54 in accordance with a frequencY dividing data signal produced from the data processor 48 so as to automatically set a ratio of peripheral velocities of the drum 1 and the feeding conveyer 30 and the feeding quantity of the rubber sheet. Numeral 57 denotes a digital switch for setting the feeding quantity of the rubber sheet by the feeding conveyer at the time other than when the rubber sheet is wound, and numeral 58 denotes a pulse generator for use with the digital switch 57 and including a P~S setting de~ice.
Numeral 59 denotes a relay circuit unit for selecting the pulse signal of the pulse generator 53 or the frequency divider 55. Numeral 60 denotes a relay circuit unit for selecting the pulse signal of the pulse generator 58 or the frequency divider 56 and performing the control operation for selectively feeding the rubber sheet 4 or 5. Numeral 61 ... .. .. ... ... .. . . .. . . . . . . ..

6~0 denotes a pulse motor driver responsive to the output pulse signal of the relay circuit unit 59 for driving a pulse motor 15 and numerals 62 and 63 denote pulse motor drivers responsive to the output pulse signal of the relay circuit unit 60 for driving pulse motors 44 and 45, respectively.
Numerals 64 and 65 denote AC motor control units for the geared motors 28 and 46 with AC brake~ respectively? and including a comparison circuit for a stroke setting signal produced from the data processor and a position detection pulse signal produced from the PG 29 and 47.
Numeral 66 denotes a pneumatic control device for air cylinders 17, 37 and 39 and including a solenoid operated valve and a pressure reducing valve.
Further, the controller comprises a limit switch, ~.
a proximity switch, a photo-electric switch and the like for detecting the operating condition of the movable frames and the air cylinders and a driving circuit for the rubber sheet feeding device although not shwon.
The present invention will now be described by way ~-of example with reference to the formation of the V belt to ~-i which the present invention is applied.
Concerning all types of V belts which are planned to be formed by the present controller, the specification data including the type number V and the peripheral length L
for each ~ belt, the material number Mn of the used rubber . .

o sheet, the thickness Mt of the rubber sheet and the number o~
wound iayers M~ corresponding to the grade number ~ and the number D of the used drum, the material number Mn of rubber sheet supplied to the ser~icer, the supply location thereof P
~the feeding de~ice number~ and mechanical data described later are inputted and stored in the data processor 48.
Before starting the formation of the belt, the designation data including the formation order N, the type number V, the peripheral length L and the grade number M of the V belt to be formed in a predetermined time of period are inputted to the data processor ~8 and the operating control 50 is then operated to start automatically.
The sequence circuit unit 49 then produces a data : request signal to supply it to the data processor 48. When the data processor 48 identifies in response to the data request signal that the counter memory in the memory circuit is N, the CPU selects the type number V, the peripheral length L and the grade number M of the V belt of the formation order N on the basis of the designation data in the memory circuit to select the specification data corresponding to the selected designation data and performs a next operation~
~ The forward stroke data signal for the feeding unit 6 andJor 7 is given by .. . . . . .. . . .

3L2~6~L9 Xl= ~t- hl~(L t C)i --d 2 where a " b " c, and d, are mechanical data which are .calculated by the following equations and inputted previously ~the data for the feeding units 6 and 7 are required to be calculated and inputted independently).

al = k,(~, - 5~), b~ = 2~ cl = 2 dl= 2l~h kl ; the nurnber of pulse trains generated by the PG's 2~ and 47 when the feeding units 6 and 7 are moved a unit distance.
S~ ; the horizontal distance between the center of the drum 1 when the feeding units 6 and 7 are in a wait position and the center of the sponge rolls 36 and 38 bein~ in the wait position.
sl ; the pxope.r pressing stroke of the sponge rol1s 36 and 38.
r ; the radius of the sponge rolls 36 and 38.
h ; the difference in height between the center of the drum ..
1 and the center of the sponge rolls 36 and 38.
: - , .
The results.to be calculated by the following equation are previously set to the digital switch 57 as for the feeding units 6 and 7, respectively.

~2~6~ ~0 The feeding length of the rubber sheet 4 and~or 5 is given by X2- k2(Lo~ Sz) k~ ; the number of outpu* pulses supplied to the pulse motors 44 and 45 required to cause the feeding units 6 and 7 to feed the rubber sheets 4 and 5 a unit distance.
Lo ; the length of the end 4b of the rubber sheet fed from the cutting position of the rubber sheet 4 by the cutter 33 beFore starti ng the winding op~ration ~this length is previously inputted to the data processor 48 as a mechanical data).
S2 ; the distance between the cutting position of the rubber lS sheet 4 by the cutter 33 and the detection position by the photo-electric switch 34.

The data processor 43 supplys the above calculated result Xl to the AC motor control units 64 and 65 and supplys the si~nal of the position number P ~for example 6) supplied with the rubber sheet having the used material number Mn to the sequence circuit unit 49. The sequence circuit unit 49 thus sends the start signal to the AC motor control unit (for example, the AC motor control un~t ~)and starts the measurement of the peripheral length.

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b~hen the start command is supplied to the AC ~otor cont-rol unit 64, the feed screw 25 is rotated through the geared motor 28 with brake to move the feeding unit 6 forward ~to approach the drum 1). When the number of the pulses generated by the PG 29 reache~ the above value Xl, the forward movem`ent of the feeding unit 6 is stopped and the stro~e completion signal is supplied to the sequence circuit unit 49. Thus, the sequence circuit unit 49 causes the relay clrcuit unit 6n to select the pulse generator 58 and the pulse motor diriver 62 and supplys the pulse generation command to the pulse generator 58 so that the feeding conveyer 30 is operated through the pulse motor 44 to ~eed the rubber sheet 4. When the number of pulses ~enerated from the generator 58 after the end 4b of the rubber sheet 4 has been detected by the photo-elctric switch 34 reaches the value X2 preset to the digital switch 57 ~Fig. 3(A)), the feeding conveyer 30 is stopped and the pulse generator 58 supplys the feeding completlon signal to the sequence circuit unit 49.
On the other hand, the peripheral length is measured durlng the above operation. The sequence circuit unit 49 first operates the air cylinder 17 through the pneumatic control device 66 to bring the peripheral length measureing roller 18 into contact with the surface of the drum 1 (or the surface of the rubber sheet wound on the dru~).
The relay circuit unit 5~ is caused to select the pulse ... . . .

generator 53 to start the generation of pulses and the drum 1 is rotated through the pulse motor driver 61 and the pulse motor 15. When the proximity switch 16 operates, the counter 51 starts to count the pulses of the PG 22 and when the proximity switch 16 operates next, the counter 51 stops to count the pulses of the PG 22 and the resultant count signal X3 is supplied to the data processor 48 with the count -~
completion signal being 5uppl ied to the sequence circuit unit 4~. The sequence circuit unit 49 stops the rotation of the drum 1 and returns the air cylinder 17 to its original ;:
po5 i tion to termin~te the measurement of the peripheral length.
The data processor 48 performs the following calculation on the basis of the measured peripheral length data signal X3.
' Measured peripheral length Ln =~3X3 Frequency dividing ratio of drum KD =a~ 1~D
Frequency dividing ratio of conveyer KC = as/(Lgi x ~D) i = 1 t 2, winding order .
LDI = 1~ ~ ~ X ~t~) X ~
LD2 - L~ ~ 2 7~ 1t ~ ) ~ Ir (M~ 1t 2 ) X ~ 2 Wound rotational quantity X~ =a~ LL ) i = 1, 2~ : winding order LE~' L~ 4, X ~tl) t ~l : - 17 -.
.. . ~ ~, . ..... ~ .. ... ........ . ... ... . . . .

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LE2 = L~ ~ 2~ (~ tl)t2~ 2x ~t2) t ~2 where ~; and ~; represent correction coefficients on the basis of the characteristics and the lap area of the rubber sheet, and Z~ represents the speed of rotation (RPM) of the drum when the rubber shee-t i 5 wound. These data are previously inputted as the specification data. Further, the data a3, a4, as and a6 are the mechanical data calculated by the following equations and previously inputted. It may be convenient to utilize the following equation of a instead of utilizing the equation.

a3=l~d/k3~ a~ = ~o ~l /k4, D k~
d ; diameter of the roller 18 for measuring the peripheral length k3 , number of pulses generated by the PG 22 for one rotaion of the roller 18 H : PXS of the pulse generator 54 k4 ; number of pulses supplied to the pulse motor 15 required :i`
for one rotation of the drum 1 After the above calculation is completed, the signal KD' KC and X~ are supplied to the frequency divider 55, 56 and the pulse genetator 54, respectively, and the ~2~

calculation completion signal is supplied to the sequence circuit unit 49. In accordance with the feeding completion signal and the calculation completion signal for -the rubber sheet 4, the sequence circuit unit 49 causes the relay circuit unit . 59 to select the frequency divider 55 and the relay circuit unit 60 to select the frequency divider 56 and the pulse motor drive At the same time, the air cylinder 37 is operated through the pneumatic control circuit 66 to move the sponge roller 36 so that the end 4b of the rubber sheet 4 is pressed and adhered to the surface of the drum 1 (Fig.

3(a)). Thereafter, the pulse generation command i9 supplied to the pulse generator 54 and the pulse motors 15 and 44 are driven in synchronism with each other through the frequency dividers ~5 and 56, the relay circuit units 59 and 60t and the -pulse motor drivers 61 and 62 to wind the rubber sheet 4 on ~;~
the drum 4. When the number of pulses generated by the pulse generator 54 reaches X4(Fig. 3(C)), the pulse motors 15 and 44 are stopped and the winding completion signal is produced to the sequence circuit unit 49. Thus, the sequence circuit 2.0 unit 49 controls the cutter 33 through a circuit not shown to -cut the rubber sheet 4. Then ? the pulse generator 54 is operated for a predetermined time to drive only the pulse motor 15 through the frequency divider 55, the relay ci-rcuit unit 59 and the pulse motor driver 61. After the remainig portion of the rubber sheet 4 is wound, the feeding unit 6 is returned to the wait condition and the winding process is terminated.
In accordance with the specification of the V be1t, further layers of the rubber sheet 5 may be wound by the same operation.
When all the winding process is terminated, the sequence circuit unit 49 produces the end signal to the data processor 48 and causes the data processor 48 to per~orm the next process, that is, the exchange of the drum and the like.
In the data processor 48, the counter memory in the memory circuit is incremented by 1 to be (N~1).
Although -the abo~e description has been made to the V belt by way of example, the formation of the flat belt or the like can be made in the same manner if the ~ormation includes the process of winding the unvulcanized rubber sheet on the drum.
In the above embodiment~ although only the pulse motor 15 is provided for rotating the drum 1, other equipments are provided in many cases and stitching and cutting operations are performed while rotating the drum 1.
In such a case, it is advantageous in a cycle time that another motor is pro~ided which is switched with the pulse motor 15 through a clutch to rotate the drum 1. In the case where the additional motor is switched through the clutch to rotate the drum 1 and the rotation of the drum 1 for ~Z~6~

measuring the peripheral length is made by the additional motor, the pulse generator 53 and the relay circuit unit 59 are removed in the circuit of Fig. 4 and the frequency divider 55 may be directly coupled with the pulse motor driver 61.
. Further, although the pulse motors are used to drive both the drum 1 and the conveyer for the feeding units 6 and 7~ one of them may be a DC servomotor~ a DC motor with PG, an AC motor with PG or a pulse motor and the other may be a DC servomotor. In such a case, while the circuit of Fi~. 4 is partly changed to be suitable for such a motor drive circuit, the variation is simple to those skilled in the art and the description will be omitted.

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Claims (4)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A controller for winding an unvulcanized rubber sheet which comprises a cylindrical drum rotated by a motor for winding the unvulcanized rubber sheet thereon, a conveyor for feeding the unvulcanized rubber sheet on the drum, a data processor for calculating a ratio of peripheral velocities of the drum and the feeding conveyer and a feeding quantity of the unvulcanized rubber sheet on the basis of a previously inputted data and a sequence control unit responsive to an output of the data processor for controlling a sequence operation of a movable portion.

2. A controller for winding an unvulcanized rubber sheet which comprises: a cylindrical drum rotated by a motor for winding said unvulcanized rubber sheet; a motor-driven feeding conveyor for feeding said unvulcanized rubber sheet to said drum; means for measuring the outer peripheral length of said drum, including any already-wound rubber sheet, before winding said unvulcanized rubber sheet; a data processor for calculating (a) the amount of winding rotation of said drum for winding said unvulcanized rubber sheet on said drum on the basis of previously input data and said measured outer peripheral length of said drum and (b) dividing ratios for said drum and said conveyor respectively so as to synchronize the peripheral velocities of said drum and said feeding conveyor and to output said dividing ratios; and a sequence control unit for controlling the sequence of operation of each of the aforesaid motors, said sequence control unit to be driven on the basis of the output of said data processor.

3. A controller for winding an unvulcanized rubber sheet, as claimed in claim 2, wherein said output by said data processor of the calculated amount of winding rotation of said unvulcanized rubber sheet on said drum includes a compensation for the characteristics and degree of overlap of said unvulcanized rubber sheet.

4. A controller for winding an unvulcanized rubber sheet, as claimed in claim 3, wherein the degree of overlap is defined by the circumferential distance between the leading edge of the said sheet and the trailing edge of said sheet.