JP4704602B2 - Sidewall pasting former - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sidewall sticking former for manufacturing tires.
[0002]
[Prior art]
In the production of raw tires, the bead is set after affixing the inner liner, carcass, etc., the carcass is folded around the bead to form a raw cover (sometimes called a first cover), and then a sidewall is attached to the raw cover. is there.
[0003]
FIG. 9 shows a conventional sidewall pasting former. This side wall pasting former 40 includes a rotatable shaft 42 and a pair of left and right ring members 41, 41 provided on the shaft 42. As shown in FIG. It has a flat (same diameter) short cylindrical shape, and its outer diameter is set smaller than the inner diameter of the raw cover 30.
In the side wall affixing operation, the raw cover 30 is inserted and set in the former 40, the starting end of the side wall 44 is pressed against the outer peripheral surface of the raw cover 30 by the roller 45, and the low cover 30 is rotated by rotating the shaft 42 to rotate the side wall 44. Paste.
[0004]
[Problems to be solved by the invention]
However, since the low cover 30 is suspended in a point contact manner (as viewed from the axial direction) on the ring members 41 and 41, slip (rotational speed difference) occurs between the rotating ring members 41 and 41 and the low cover 30. This was the cause of cut variations during automatic cutting. Further, since the outer peripheral surface of the ring member 41 is flat in the axial direction, the bead folding portion 34 (see FIG. 8) of the raw cover 30 disposed on the outer end side in the axial direction of the ring member 41 rises and the side wall application surface becomes Due to the taper shape, there is a problem that a difference in peripheral speed of application occurs at the left and right ends in the width direction of the sidewall, resulting in a decrease in automatic joint accuracy.
[0005]
Then, an object of this invention is to provide the side wall sticking former which can stick a side wall to a low cover with high precision.
[0006]
[Means for Solving the Problems]
To achieve the above object, the sidewall affixed former according to the present invention includes a pair of left and right formers body provided rotatable shaft, each said former body, the circumferential length of two types magnitude a plurality of former segments, alternately disposed, a support member roller is provided radially inner end side together with the former segment is kicked mounted radially outer end side, the support member in the radial direction is reciprocated by and a scaling means for scaling the plurality of formers segment further by expanded the plurality of formers segments at equal radial stroke, the plurality of formers in expanded state configured as the outer surface of the segment is a continuous cylindrical surface, said scaling means comprises a cylindrical body attached to the outer fitting shape to the shaft, axially reciprocally in the tubular member A taper cone that is fitted and presses the rollers of the plurality of support members at its tapered surface to move the support members in the outer diameter direction, and is suspended on the plurality of support members to move the support members in the inner diameter direction. An elastic band for elastically energizing the tape, forming an air supply chamber between the cylindrical body and the taper cone, adjusting the pressure of the air supplied to the air supply chamber, and The plurality of former segments are expanded in a balanced manner by balancing the pressing force that moves in the axial direction and presses the plurality of support members in the outer diameter direction and the elastic biasing force in the inner diameter direction by the elastic band. Further, the pair of left and right former bodies are configured to be fixed to the shaft so as to be integrally rotatable with the shaft, and can be integrally rotated with the shaft. A former body of the movable mounted slidably in a direction, consist, and the former body of the movable adjustably configure the axial width of the former is brought closer to and away from the former body of the fixed-side Is.
[0007]
Also, Ru der which inclined surface is provided in the axially outer end of the outer surface of each said former segments.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
[0009]
FIG. 1 shows an embodiment of a sidewall sticking former according to the present invention.
This side wall sticking former includes a pair of left and right former bodies 1, 1 provided on a rotatable shaft 2. As shown in FIG. 1 and FIG. 2, each former body 1 is a radial expanding type, and a plurality of former segments 3 (3a,... 3b,. ), And a support member 4 having the former segment 3 attached to the outer end side, and expansion / contraction means 5 for expanding / contracting the plurality of former segments 3 by reciprocating the support members 4 in the radial direction.
[0010]
The expansion / contraction means 5 includes a cylindrical body 6 having an outer flange portion 6a at the outer end in the axial direction, a tapered cone 7 that is externally fitted to the cylindrical body 6 so as to be capable of reciprocating in the axial direction, and an attachment member at the inner end in the axial direction of the cylindrical body 6 A plurality of radial guide members 8 which are attached via 21 and arranged at equal circumferential pitches, and are supported by support members 4 which are slidably attached to the respective radial guide members 8. And an elastic band 9 that elastically urges each support member 4 in the inner diameter direction. The outer end in the axial direction is the end far from the center line P between the pair of left and right former bodies 1, 1, and the inner end in the axial direction is the end closer to the center line P. Define.
[0011]
The tapered cone 7 has an axial hole, a tapered surface 7a on the inner end side in the axial direction, and a recess formed on the outer end side in the axial direction. The taper cone 7 is externally fitted to the cylindrical body 6, whereby an air supply chamber 10 is formed between the tapered cone 7 and the cylindrical body 6. Then, air from an external air supply source is supplied to the air supply chamber 10 via an air flow path (not shown).
[0012]
The support member 4 is provided with a roller 11 that rolls on the tapered surface 7a of the tapered cone 7 on the radially inner end side. An arc plate-shaped former segment 3 is detachably attached to the outer end of the support member 4 in the radial direction. In the present embodiment, six support members 4 are provided at a central angle of 60 °, and two types of former segments 3a and 3b having large and small circumferential lengths are alternately attached to the six support members 4. The case is shown as an example.
[0013]
In the former segment 3a having a long circumferential length, gradient surface portions 12 and 12 are formed at the circumferential ends of the arcuate inner surface, and in the former segment 3b having a short circumferential length, the arcuate shape is formed. Gradient surface portions 13 and 13 are formed at the circumferential end portions of the outer surface, and the former segments 3a... 3b. In addition, a slope surface 14 is provided at the axial outer end (shoulder portion) of the outer surface of each former segment 3. That is, in the former body 1 in the expanded diameter state, the shoulder portion on the outer peripheral surface thereof is tapered.
[0014]
The large and small former segments 3a and 3b are set to predetermined circumferential lengths M ₁ and M ₂ , respectively, and the curvature radius R of the outer surface thereof is set to the curvature radius of the inner circumferential surface of the mounted low cover. It is set to be approximately equal and set to a predetermined axial length L.
[0015]
By the way, as shown in FIG. 3, this side wall pasting former has one (left side) former body 1 (1a) fixed to the tip of the shaft 2 so as to be integrally rotatable, and the other (right side) former body 1 ( 1b) is attached to the shaft 2 by a power transmission mechanism 15 so as to be integrally rotatable and slidable.
[0016]
This power transmission mechanism 15 is connected to the cylinder 6 of the former body 1b on the moving side and is slidably fitted to the shaft 2; a key 17 provided on the pipe body 16; The formed keyway 18 and a non-rotating member 20 that is externally fitted to the pipe body 16 via a bearing 19 are provided. Then, as shown in FIGS. 1 and 3, the non-rotating member 20 is reciprocated along the shaft 2 by reciprocating means such as a cylinder, for example, so that the moving former body 1b approaches the fixed former body 1a. -By separating (opening and closing the former), the axial width W of the former can be adjusted to correspond to the axial length of the raw cover. In addition, the drive part which rotates the shaft 2 is abbreviate | omitting illustration.
[0017]
Next, the expansion / contraction operation of the former body 1 will be described. 2 and 4, the upper half shows the expanded state of the former, and the lower half shows the reduced diameter state of the former. In the diameter expansion operation, a predetermined pressure of air is supplied to the air supply chamber 10 inside the taper cone 7, so that the taper cone 7 resists the elastic force of the elastic band 9 in the axial direction (arrow A direction). The roller 11 is moved until it abuts against the roller 21 and presses the rollers 11 at the inner ends of the support members 4. As a result, the rollers 11 move in the outer diameter direction while rolling on the tapered surface 7 a of the tapered cone 7. That is, the support members 4 and the former segments 3 move in the outer diameter direction (arrow B direction), the plurality of former segments 3 increase in diameter, and the outer surface becomes a continuous cylindrical surface. Opened.
[0018]
Further, in the diameter reduction operation, air is discharged from the air supply chamber 10 inside the taper cone 7, so that the rollers 11 of the support members 4 press the taper surface 7 a by the elastic urging force of the elastic band 9. The taper cone 7 is moved in the axial direction (arrow A ′ direction), whereby each support member 4 is moved in the inner diameter direction (arrow B ′ direction), and the plurality of former segments 3 are reduced in diameter. It becomes a state.
[0019]
In this expansion / contraction operation, each support member 4... Moves with the same radial stroke. That is, the plurality of former segments 3 are expanded and contracted with the same radial stroke. At this time, by providing the inclined surface portions 12, 12, 13, 13 at the circumferential ends of the large and small former segments 3a, 3b, the plurality of former segments 3a,. And with a relatively large radial stroke. Note that the pair of left and right former bodies 1 and 1 perform expansion / contraction operations synchronously.
[0020]
Further, as shown in FIG. 5, this sidewall sticking former is formed by a pressing force F ₁ that moves the taper cone 7 in the axial direction by air and presses the plurality of support members 4. A plurality of former segments 3 can be maintained in an intermediately expanded state in balance with the elastic biasing force F _{2 in the} inner diameter direction. That is, the pressure of the air supplied to the air supply chamber 10 inside the taper cone 7 so as to balance the contraction force of the elastic band 9 when the plurality of former segments 3 are in a partially expanded state that is somewhat smaller than the inner diameter of the raw cover 30. Adjust. By holding the former bodies 1 and 1 in the middle expanded state in this way, the low cover 30 can be easily inserted and set in the former.
[0021]
By the way, as shown in FIGS. 6A and 6B, the low cover 30 has at least the inner liner and the carcass 32 attached, and then the bead members 33 and 33 are set, and the carcass 32 is folded around the bead members 33 and 33. As shown in FIG. 6 (c), the raw cover 30 is set on the side wall application former (of the present invention) and the side walls 31, 31 are attached.
[0022]
At this time, as shown in FIG. 1 and FIG. 7, since the slope surface 14 is provided at the axial outer end (shoulder portion) of the outer surface of each of the former segments 3 of the former body 1, the former body 1 The bead folding portion 34 of the set low cover 30 becomes flat. In other words, the bead folding portion 34 of the low cover 30 is thick (due to the folding portion of the apex and carcass 32, etc.), but the outer circumferential surface of the bead folding portion 34 is escaped by the slope 14. (Side wall sticking surface) can be made flat. Accordingly, when the sidewalls shown in FIGS. 6 (b) and 6 (c) are pasted, the circumferential speeds of the left and right edges 31a and 31a of the sidewall 31 are equal and can be accurately pasted to the raw cover 30, and automatic joint accuracy Will improve. In addition, the former body 1, 1 expands to an outer diameter corresponding to the inner diameter of the raw cover 30 and holds without gaps, so the raw cover 30 rotates integrally with the former main body 1, 1 without slipping, and the sidewall automatic Cut variation at the time of cutting can be eliminated.
[0023]
FIG. 8 shows a comparative example. If the outer end (shoulder portion) of the outer surface of each former segment 3 ′ is flat, the bead folding portion 34 of the low cover 30 set on the former body 1 ′ It rises and the outer peripheral surface (sidewall sticking surface) becomes tapered. Therefore, when the sidewall is applied, a difference in the peripheral speed of the application occurs at the left and right ends in the width direction of the sidewall, and the automatic joint accuracy is reduced.
[0024]
The present invention is not limited to the above-described embodiment. For example, the former segments 3 are prepared for various sizes (circumferential length M ₁ , M ₂ radius of curvature R and axial length L). It is also preferable to select the former segments 3 of a size corresponding to the size (diameter and axial length) and replace them with the support members 4.
[0025]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0026]
(According to claim 1) Since the former main bodies 1 and 1 are expanded to the outer diameter corresponding to the inner diameter of the raw cover 30 and are held without any gaps, the former main body 1 is free from slippage when the raw cover 30 is applied. , 1 can be rotated integrally with each other and cut variations during automatic cutting can be eliminated.
Further, since the plurality of former segments 3 are composed of two kinds of sizes in the circumferential direction, there is an advantage that they can be expanded / contracted without interfering with each other and a large radial stroke can be easily obtained. Therefore, it can respond to tire covers of various sizes.
[0027]
(According to claim 2) When the raw cover 30 is set, the thick bead folding part 34 of the raw cover 30 is escaped by the slope surface 14 of each former segment 3 ... and the outer peripheral surface of the bead folding part 34 ( Sidewall sticking surface) can be made flat. Therefore, when the side walls are applied, the peripheral speeds of the left and right ends 31a, 31a in the width direction of the side walls 31 become equal, and the automatic joint accuracy is improved. That is, the side wall sticking accuracy is further improved.
[0028]
(According to claim 1 ) The expansion / contraction means 5 has a simple structure, and can be manufactured compactly and at low cost as a whole.
(According to claim 1 ) By holding the former main bodies 1 and 1 in the halfway expanded state, the low cover 30 can be easily inserted and set.
[Brief description of the drawings]
FIG. 1 is a cross-sectional front view seen from a radial direction showing an embodiment of a sidewall sticking former according to the present invention.
FIG. 2 is a cross-sectional side view seen from the axial direction showing an expanded state and a reduced diameter state.
FIG. 3 is a cross-sectional front view showing a state in which left and right former bodies are separated from each other.
FIG. 4 is a cross-sectional front view of an essential part showing an expanded state and a reduced diameter state.
FIG. 5 is a cross-sectional front view of an essential part showing a halfway expanded state.
FIG. 6 is an explanatory diagram illustrating a process from forming a raw cover to attaching a sidewall.
FIG. 7 is a cross-sectional front view of an essential part showing a state where a raw cover is set on a former body.
FIG. 8 is a cross-sectional front view of an essential part showing a comparative example.
FIG. 9 is a perspective view showing a conventional example.
FIG. 10 is an operation explanatory diagram showing when a sidewall is attached.
[Explanation of symbols]
1 Former body
2 shaft 3 former segment 4 support member 5 expansion / contraction means
6 cylinder 7 taper cone 7a taper surface 9 elastic band
11 rollers
14 gradient surface F ₁ pressing force F ₂ resiliently urging force
W axis width

Claims (2)

Comprising a mounted on a rotatable shaft (2) pair of the former body (1) (1), each of the former body (1) is, the circumferential length are disposed alternately in two large and small plurality the former segment (3) ..., and the support member (4) in the radial inner end side roller (11) provided with the former segment (3) is kicked mounted radially outer end side, the the support member (4) ... by reciprocating in the radial direction and a plurality of former segment (3) ... scaling means for scaling the (5), further, the plurality of formers segment (3) ... a equal by diameter at radial stroke, constituted by expanded state as the plurality of formers segment (3) ... outer surface of a continuous cylindrical surface,
The expansion / contraction means (5) is externally fitted on the shaft (2) so as to be fitted on the shaft (2), and is externally fitted on the cylindrical body (6) so as to be capable of reciprocating in the axial direction. ) Presses the rollers (11) of the plurality of support members (4) to move the support members (4) in the outer diameter direction, and the plurality of support members (4). An elastic band (9) that is suspended on the elastic member and elastically urges each support member (4) in the inner diameter direction,
An air supply chamber (10) is formed between the cylindrical body (6) and the taper cone (7), and the pressure of the air supplied into the air supply chamber (10) is adjusted, so that the taper cone (7) Is moved in the axial direction by air, and a pressing force (F ₁ ) for pressing the plurality of support members (4)... In the outer diameter direction, and an elastic urging force (F ) in the inner diameter direction by the elastic band (9). ₂ ) and in balance, the plurality of former segments (3)...
Further, the pair of left and right former bodies (1) and (1) includes a fixed-side former body (1) fixed to the shaft (2) so as to be integrally rotatable, and a shaft and a shaft that are integrally rotatable with the shaft (2). A moving-side former body (1) slidably mounted in a direction,
A side wall sticking former characterized in that the former body (1) on the moving side is moved closer to and away from the former body (1) on the fixed side to adjust the axial width dimension (W) of the former. . Each said former segments (3) sidewall affixed former of claim 1, wherein the inclined surface axially outer end (14) is provided on the outer surface of the.

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