JPS635257B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing pneumatic tires and an apparatus for carrying out the same, both of which are applicable to the manufacture of tires for motorized bicycles or bicycles.

British Patent No. 733206 describes a method of building a tire on an inflatable building drum, in which a number of cord plies are applied onto the building drum to form a band and the cord plies are The process consists of beading the ends of the bead onto a bead-forming ring and applying a tread. The method described above allows only one tire to be produced on the drum at a time, severely limiting tire production.

Another conventional method of manufacturing pneumatic tires is to form a tubular tire blank from a number of plies of rubberized cord, cut the blank thus obtained into bands of a predetermined width, attach a bead-forming ring to each said band, and attach the cord. The process consists of beading the ply onto a bead-forming ring and then applying a tread. In an apparatus for carrying out the method (see U.S. Pat. No. 3,375,151), inflatable building drums are connected in tandem in a row and a tubular tire blank is formed thereon from rubberized cord plies. There is. The blanks are then cut by a cutting device and the building drums are separated from each other to form a tire on each building drum.

Therefore, in these pneumatic tire manufacturing methods and equipment, only one tire can be manufactured at a time, even if the tubular blank is initially formed to form a large number of tires. This will also limit tire production.

The first essential object of the invention is to form a common tubular blank for a large number of tires and to manufacture these tires at the same time, thereby increasing the yield of tires and improving the accuracy of the tires manufactured. An object of the present invention is to provide a method and apparatus for manufacturing pneumatic tires that can improve quality.

The method involves forming a tubular blank from a number of rubberized cord plies, cutting the blank into bands of a predetermined width, setting a bead forming ring matching the number of bands obtained, and beading the ends of the cord plies. The process of beading and applying treads on forming rings is accomplished by attaching all bead forming rings to the tubular blank before cutting it into bands.

Apparatus for carrying out the method comprises an annular groove arranged in close proximity to each other in a line relative to a tubular blank for forming the tubular blank from a plurality of plies of rubberized cord and receiving a bead-forming ring. a plurality of inflatable building drums, a cutting device for cutting the tubular blank into bands of predetermined width, an expansion device for radially expanding the drum sections, and beading the ends of the cord ply onto the bead forming ring. a bead applicator consisting of left and right radially and axially movable split members for attaching, and all said inflatable drums are set on a common drive shaft and between said movable left all of the devices for beading said cord ply onto said bead-forming ring, wherein a dividing member and a right-hand dividing member are inserted to form a common cylindrical surface forming a tubular tire blank with said drum section; said dividing members of said drum are interconnected by links, said links extending through diametrical slots in a guide disc set in said common shaft below said drum section; It consists of equipment.

This pneumatic tire manufacturing method and equipment improves tire productivity because the operations of installing the bead-forming ring, cutting the tubular blank, and beading the cord ply onto the bead-forming ring are difficult for multiple tires. This is because multiple pairs of bead-forming rings can be installed simultaneously, tubular blanks can be cut into bands simultaneously, and the ends of the cord plies can be beaded onto the bead-forming rings simultaneously. Furthermore, a large number of tires are manufactured under similar conditions, the tubular blank is cut after installing a bead-forming ring on it (i.e. each cord system is held in a bead-forming ring and tensioned). Time),
This is also due to improved tire quality.

Furthermore, the number of cuts in the cord ply is reduced and therefore the amount of work during pre-treatment (eg beading and cutting the cord) is likewise reduced.

By combining the installation of the bead-forming ring, the cutting of the tubular blank into bands, and the beading of the cord ply onto the bead-forming ring, tire manufacturing equipment is simplified.
Therefore, the tire manufacturing method can be automated.

Additionally, this device was produced by simultaneously inflating all of the drums set on a common drive shaft and by beading the cord plies simultaneously, first all right-hand plies and then all left-hand plies simultaneously. Sexuality improves.

According to this invention, the drive shaft is formed hollow and accommodates an axially movable sleeve opposed to the shaft by a spring, and the sleeve is connected to the link of the left-hand dividing member. It carries a co-operating stop, and an axially movable push rod is housed inside the sleeve, which press rod holds a stop co-operating with the link of the right-hand part. Both the drive shaft and the sleeve are each provided with a slot for accommodating the stop. This structure allows the overall size of the tire building apparatus to be reduced and also simplifies the mechanism for beading the cord ply onto the bead forming ring.

The push rod is provided with a stop that cooperates with the sleeve when the push rod is moved to its initial position, and the stem is passed through the push rod to cooperate with the stop so that the sleeve It is advantageous to disengage the locking body from the sleeve when moving into the initial position, so that both the left-hand and right-hand parts can be operated synchronously.

It is likewise advantageous for a roller stop to be accommodated in a slot in the guide disc, said roller stop cooperating with the link and held in said slot by a rubber ring.

Therefore, the method of manufacturing a pneumatic tire and the apparatus for carrying out the method according to the present application increase manufacturing efficiency, produce tires of high quality, simplify the assembly equipment and allow automation of the manufacturing method. .

The method of the invention and the apparatus for implementing it will be explained in detail below with reference to the drawings.

The pneumatic tire manufacturing method proposed here is adapted to be carried out on inflatable building drums 1 (FIG. 1), which are arranged in a row in close proximity to each other and contain several tires. In forming the
A preset number of plies of rubberized cord can be wound.

When the rubberized cord is wound around said drum in a single ply or in several plies, a tubular blank 2 is obtained.

Then several pairs of bead-forming rings 3 (Figure 2)
is attached to the tubular blank, adapted to the number of tires to be obtained from said blank, and said bead-forming ring 3 is arranged on the drum 1 in the position in which it is attached to the blank. There is. The drum 1 is then synchronously expanded, thereby stretching the tubular blank 2 and ensuring that the ring 3 is adhered to the cord. Next, the tubular blank 2 is attached to each pair of bead-forming rings 3
to form a band 4 (FIG. 3), and the end 5 of the cord ply is lifted as shown in FIG. 5 is bent onto the bead forming ring 3.

A tread 6 (with or without breakers) is then applied to the carcass formed as described above to effect stitching or pressing. The drum is then deflated and the finished tire 7 (FIG. 6) separated therefrom.

A large number of tires are thus produced for each technical cycle, ie four tires as shown in FIGS. 1-6.

In the following, details will be given of an apparatus implementing the proposed method, i.e., for example for producing two pneumatic tires, which are arranged in tandem in a row in close proximity to each other, in which tubular blanks are two inflatable assembly drums 1 (seventh
) and a device 8 for cutting tubular blanks into bands, and said device can be of any currently used construction and the number of inflatable drums 1 used can be reduced at once. Determined by the number of tires manufactured.

Each drum 1 is provided with an annular groove 9 for accommodating a bead-forming ring, a device 10 for radially expanding the pieces 11 of the assembled drum 1, and a device 12 for beading the ends of the cord plies onto the bead-forming ring. The device includes left and right-hand dividing members 13, 1 which are movable in the radial and axial directions, respectively.
It is equipped with 4.

All drums 1 are set on a common hollow shaft 15, and between the drums 1, on their end faces, movable left-hand and right-hand parts 13 and 14 are inserted, which extend along the parts 11 of the drums 1. A common cylindrical surface 16 is defined for forming a tubular blank therein as shown in FIGS.

Each device 10 (FIG. 7) for radially expanding a segment 11 of the drum 1 comprises a pair of levers 17 pivotally connected to the drum segment 11 and a bushing 1.
The bushing 18 of all radially expandable devices 10, consisting of 8, is carried in a sleeve 19, which is attached to the drive shaft 15 by means of bearings 20 and adapted for axial movement therefrom. An optional drive is provided, said drive being interconnected to the sleeve 19 via a cross arm 21. The sleeve 19 is provided with a number of longitudinal slits 22.

All equipment for beading cord plies 12
Similar split members, namely left hand member 13, are interconnected by links 23, while split member 1
4 are interconnected via links 24, which carry at their ends an L-shaped bracket 25, in which the left-hand split piece 13 and the roller member 26 (FIG. 9) are held. This is done by beading and stitching the ends of the cord ply and by attaching the left beveled end 27 (seventh
(Fig.) is designed to make contact. link 24
The end of the bracket 28 holds an L-shaped bracket 28, which includes the right-hand dividing member 14 and the roller member 29.
is fixed, which is in contact with the right-hand beveled end 30 of the piece 11 of the drum 1.

Link 23 is located on the left side (in the drawing) of drum 1.
two guide discs 3 provided under the piece 11 of
is housed within the diametrical slot 31 of 2;
The links 24 are also located in slots 33 in two guide discs 34 located below the piece 11 of the drum 1 on the right side (in the drawing).

The guide discs 32, 34 are held on the drive shaft 15 by pins 35, which pass through longitudinal slots 22 in the sleeve 19.

The interior of the drive shaft 15 accommodates an axially movable sleeve 37 which is held in bearings 36 and driven by a spring 38 which presses the sleeve against a nut 39 bent into an extension of the drive shaft 15. , drive shaft 15
is operated against.

The sleeve 37 carries a stop 40 which is spaced apart by a distance equal to the length of the link 23 and which interacts with the end of the link 23 of the left-hand half through the middle of the roller 41. The rollers 41 are attached to the ends of the links or stops 40 to allow the links to move freely radially as the drum is extended or retracted.

The interior of the sleeve 37 accommodates a push rod 43, which can be moved axially via a cross arm 42 by a suitable drive (not shown in FIG. It holds a stop 44 spaced apart by a distance equal to , which is adapted to interact with the link 24 of the right-hand part 14 via a roller 45 . Drive shaft 15 and sleeve 37 are provided with longitudinal slots 46, 47, respectively, for accommodating stops 40, 44.

A spring 38 is inserted on the pressure rod 43 between the end face of the sleeve 37 and a stop 48 fixed to the drive shaft 15. An open-ended axial passageway is provided within the pusher rod 43 that extends through the stem 49.
is arranged to run therethrough, one end of the stem 49 extending into the square cross slot 50 of the pusher rod 43, and the other end being received in the hole 51 of the pusher rod and connecting with the restraint body 53. It has an interacting stop 52 with a spring 54 received in the bore 51 of the push rod 43 and projecting against the stop 52 of the stem 49.

Two locking bodies 55 are provided in the square cross slots 50 of the pressure rod 43, each in the form of an L-shaped lever, which
3, one of the empty ends 56 of each L-shaped lever is adapted to contact the sleeve 37, and the other end 57 is connected to a spring-loaded cup 58 fixed to the push rod 43. We're starting to come into contact.

The locking body 55 is adapted to interact with the sleeve 37 while the push rod 43 is brought into its initial position, and is actually a device that causes the sleeve 37 to move in the axial direction together with the push rod 43. . Disengaging the locking body 55 from the sleeve 37 is effected by the stem 49, which interacts with the locking body 55 during the return of the sleeve to its initial position.

A roller stop 59 (FIGS. 7 and 8) is provided in a diametrical slot in each guide disc 32, 34, said stop interacting with the links 23, 24 and secured in the slot by a rubber ring 60. 3
1,33, the ring 60 permanently presses the roller stop 59 against the surfaces of the links 23,24.

Since the device shown here is equipped with two inflatable drums 1 for producing two tires at once, said device is provided with a single device 8 for cutting tubular tire blanks, and said device is equipped with a single device 8 for cutting tubular tire blanks. 8 is provided above the dividing line of each left and right dividing member 13, 14 separating the right and left assembly drums 1, and has any shape suitable for that purpose.

The tire manufacturing method is carried out in the apparatus proposed here as follows.

With the building drum 1 (FIG. 10) contracted to have a minimum diameter Dmin, a number of rubberized cord plies are applied thereto, the ends of which are spliced to form a tubular blank 2. Ru. The bead-forming ring 3 is then mounted by any method on the building drum 1 at the location where the annular groove 9 is provided. The sleeve 19 is then moved, for example by a pneumatic drive, at arrow B (FIG. 11).
is forced to the left (in the drawing) in the direction indicated by , so that the parts 11 of the drum 1 are simultaneously pulled apart by the action of the lever 17, so that the drum diameter is increased to the maximum dimension Dmax, That is, the drum is expanded. While the drum is inflated,
The bead-forming rings 3 are seated in respective annular grooves 9 and a device 8 cuts the tubular blank 2 into bands 4. This causes the pressure rod 43 to be moved to the left in the direction indicated by arrow C (FIG. 12), so that the force exerted by the pressure rod 43 is associated with the link 24 via the stop 44. As a result, the right-hand dividing member 14 held against the link 24 is attached to the inclined end 3 of the drum section 11.
0, which causes the link 24 to run radially inward between the stops 44. A roller member 29 beads the end of the cord ply onto the right bead forming ring 3.

When the push rod 43 is in the leftmost position (FIG. 13), the locking body 55 engages the spring-actuated cup 5.
8, the pressing rod 43 is removed from the slot 50 and rotated so that its end 56 comes into contact with the end surface of the sleeve 37, as shown in FIG.

When the pressure rod 43 returns to its initial position (FIG. 14), the sleeve 37 held by the locking body 55 is moved to the right along the pressure rod 43 in the direction indicated by arrow D. The force generated by the stop 40 is transmitted to the link 23 and the force by the stop 44 is transmitted to the link 24, so that the link 23 pulls the left-hand dividing piece 13 towards the left-hand inclined part 2 of the drum piece 11.
7, so that the end of the cord ply is beaded onto the left-hand bead-forming ring 3, with the link 24 returning the right-hand dividing member 14 to its initial position (FIG. 15). When the push rod 43 is in its initial position, the stem 49 interacts with the restraint 53 and compresses the spring 54.

While pressurizing the end 57 of the stop 55, the stem 4
9 disengages the locking body 55 from the sleeve 37, so that the sleeve 37 (FIG. 16)
8 to return to the cutmost position, thereby moving the left-hand dividing member 13 between the stop body 40 and the link 23.
Return to the initial position by the action of .

The remaining tire components, such as the tread 6 (with or without breakers) are then applied to the tire carcass thus obtained, and then the sleeve 19 (FIG. 17) is moved to the right in the direction indicated by arrow E. will be moved. As a result, lever 1
7 returns the piece 11 of the drum 1 to its initial position during the movement. Drum 1 is deflated and finished tire 7
is removed from the drum.

The entire tire building process is repeated in the manner previously described by applying the next cord ply.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the tubular blank forming method, Figure 2
The figure is a schematic diagram showing the arrangement of the bead forming ring on the tubular blank, Figure 3 is a schematic diagram showing the attachment of the bead forming ring and the cutting of the tubular blank into bands, and Figure 4 is a schematic diagram showing the end of the cord ply. FIG. 5 is a schematic diagram showing the beading of the cord ply onto the bead forming ring and the application of the tread; FIG. 6 is a schematic diagram showing the removal of the completed tire; FIG. The figure is a partial longitudinal cross-sectional side elevational view of a pneumatic tire manufacturing apparatus according to the present invention;
Fig. 8 is a sectional view taken along the - line as seen in the direction of arrow A in Fig. 7, Fig. 9 is a sectional view taken along the - line in Fig. 7, and Figs. 10 to 17 are Figs. 7 in the tire manufacturing method. FIG. 3 is a side elevational view showing the location of the elements of the device; DESCRIPTION OF SYMBOLS 1... Expandable assembly drum, 2... Tubular blank, 11... Divided piece, 12... Cord ply end beading device, 13... Left side split member,
14... Right side split member, 15... Hollow drive shaft, 16... Cylindrical surface, 23... Link of left side split member, 24... Link of right side split member, 31...
Slot, 32... Guide disc, 33... Slot, 34... Guide disc, 37... Sleeve, 4
0... Stop body, 43... Pressing rod, 44... Stop body, 46, 47... Longitudinal slot, 49...
... stem, 55 ... locking body, 59 ... roller stopper, 60 ... rubber ring.

Claims (1)

[Claims] 1. A pneumatic tire manufacturing method in which a tread is attached to a tire carcass formed by applying a pair of bead-forming rings to a rubberized cord ply, wherein the treads are arranged coaxially in parallel and receive the same driving force. Thus, on a plurality of simultaneously inflatable building drums, a rubberized cord having a width sufficient to produce a plurality of tires is placed to form a tubular blank, and a plurality of pairs of bead-forming rings are placed on the tubular blank. and then simultaneously inflating the building drums with the same driving force to simultaneously stretch the tubular blank and bring the bead-forming ring into close contact with the cord plies of the said tubular blank, so that the closed pair of The cord plies of the tubular blank are cut between the bead-forming ring and another pair of bead-forming rings also in close contact to form a plurality of tubular blanks at the same time, and then for the plurality of rubberized cord plies at the same time. A method of manufacturing a pneumatic tire, characterized in that both edges of each are individually beaded over a bead-forming ring. 2 a plurality of inflatable building drums arranged in a row in close proximity to one another and each provided with a tubular groove for receiving a bead-forming ring for forming tubular blanks thereon from a plurality of rubberized cord plies; a cutting device for cutting the tubular blank into bands of predetermined width; an expansion device for radially expanding the drum sections; and for beading the ends of the cord ply onto the bead-forming ring.
In an apparatus for manufacturing pneumatic tires comprising a beading device with left and right radially and axially movable dividing members, all said inflatable drums 1 are set on a common drive shaft 15 and between them Said movable left dividing member 13
and a right-hand dividing member 14 is inserted to form, together with the section 11 of said inflatable drum 1, a common cylindrical surface forming the tubular tire blank 2;
All the dividing members 13 or 14 of all the devices 12 for beading the ends of the cord ply onto the bead-forming ring are interconnected via links 23 or 24, which links An apparatus for manufacturing pneumatic tires, characterized in that the underside of each section 11 of each drum 1 passes through a diametrical slot 31 or 33 in a guide disk 32 or 34 set in said common drive shaft 15. . 3. The drive shaft 15 is hollow and accommodates an axially movable sleeve 37 opposed to the shaft 15 by a spring, the sleeve 37 cooperating with the link 23 of the left-hand dividing member 13. holding the body 40 and the sleeve
The interior of 37 accommodates an axially movable push rod 43, which carries a stop 44 cooperating with the link 24 of the right-hand part 14 and which allows the drive shaft 15 to be moved. The sleeve 37 has longitudinal slots 46 and 47, respectively, for accommodating the stops 40 and 44.
A pneumatic tire manufacturing apparatus according to claim 2, characterized in that it comprises: 4. The push rod 43 is provided with a stop 55 which cooperates with the sleeve 37 when it has been moved into its initial position, so that the stem 49 runs through the push rod 43 and the sleeve 37
is moved to the initial position, the locking body 55
4. A device for manufacturing a pneumatic tire according to claim 3, characterized in that it is adapted to disengage the pneumatic tire in cooperation with the pneumatic tire. 5 Slot 3 of the guide discs 32 and 34
1 and 33 accommodate a roller stop 59 cooperating with said links 23 and 24, said roller support being held in said slot by a rubber ring 60. The pneumatic tire manufacturing apparatus according to item 2.